In TODO (expect in next versions):
- Documentation/ page about TCP-AO kernel design, UAPI
- Support VRFs in setsockopt()
- setsockopt() UAPI padding + a test that structures are of the same
size on 32-bit as on 64-bit platforms
- IPv4-mapped-IPv6 addresses
- Measure/benchmark TCP-AO and regular TCP connections (on hw)
- setsockopt(TCP_REPAIR) with TCP-AO
Changes from v2:
- Added more missing `static' declarations for local functions
(kernel test robot <[email protected]>)
- Building now with CONFIG_TCP_AO=n and CONFIG_TCP_MD5SIG=n
(kernel test robot <[email protected]>)
- Now setsockopt(TCP_AO) is allowed when it's TCP_LISTEN or TCP_CLOSE
state OR the key added is not the first key on a socket (by Salam)
- CONFIG_TCP_AO does not depend on CONFIG_TCP_MD5SIG anymore
- Don't leak tcp_md5_needed static branch counter when TCP-MD5 key
is modified/changed
- TCP-AO lookups are dynamically enabled/disabled with static key when
there is ao_info in the system (and when it is destroyed)
- Wired SYN cookies up to TCP-AO (by Salam)
- Fix verification for possible re-transmitted SYN packets (by Salam)
- use sockopt_lock_sock() instead of lock_sock()
(from v6.1 rebase, commit d51bbff2aba7)
- use sockptr_t in getsockopt(TCP_AO_GET)
(from v6.1 rebase, commit 34704ef024ae)
- Fixed reallocating crypto_pool's scratch area by IPI while
crypto_pool_get() was get by another CPU
- selftests on older kernels (or with CONFIG_TCP_AO=n) should exit with
SKIP, not FAIL (Shuah Khan <[email protected]>)
- selftests that check interaction between TCP-AO and TCP-MD5 now
SKIP when CONFIG_TCP_MD5SIG=n
- Measured the performance of different hashing algorithms for TCP-AO
and compare with TCP-MD5 performance. This is done with hacky patches
to iperf (see [3]). At this moment I've done it in qemu/KVM with CPU
affinities set on Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz.
No performance degradation was noticed before/after patches, but given
the measures were done in a VM, without measuring it on a physical dut
it only gives a hint of relative speed for different hash algorithms
with TCP-AO. Here are results, averaging on 30 measures each:
TCP: 3.51Gbits/sec
TCP-MD5: 1.12Gbits/sec
TCP-AO(HMAC(SHA1)): 1.53Gbits/sec
TCP-AO(CMAC(AES128)): 621Mbits/sec
TCP-AO(HMAC(SHA512)): 1.21Gbits/sec
TCP-AO(HMAC(SHA384)): 1.20Gbits/sec
TCP-AO(HMAC(SHA224)): 961Mbits/sec
TCP-AO(HMAC(SHA3-512)): 157Mbits/sec
TCP-AO(HMAC(RMD160)): 659Mbits/sec
TCP-AO(HMAC(MD5): 1.12Gbits/sec
(the last one is just for fun, but may make sense as it provides
the same security as TCP-MD5, but allows multiple keys and a mechanism
to change them from RFC5925)
Changes from v1:
- Building now with CONFIG_IPV6=n (kernel test robot <[email protected]>)
- Added missing static declarations for local functions
(kernel test robot <[email protected]>)
- Addressed static analyzer and review comments by Dan Carpenter
(thanks, they were very useful!)
- Fix elif without defined() for !CONFIG_TCP_AO
- Recursively build selftests/net/tcp_ao (Shuah Khan), patches in:
https://lore.kernel.org/all/[email protected]/T/#u
- Don't leak crypto_pool reference when TCP-MD5 key is modified/changed
- Add TCP-AO support for nettest.c and fcnal-test.sh
(will be used for VRF testing in later versions)
Comparison between Leonard proposal and this (overview):
https://lore.kernel.org/all/[email protected]/T/#u
Version 2: https://lore.kernel.org/all/[email protected]/T/#u
Version 1: https://lore.kernel.org/all/[email protected]/T/#u
This patchset implements the TCP-AO option as described in RFC5925. There
is a request from industry to move away from TCP-MD5SIG and it seems the time
is right to have a TCP-AO upstreamed. This TCP option is meant to replace
the TCP MD5 option and address its shortcomings. Specifically, it provides
more secure hashing, key rotation and support for long-lived connections
(see the summary of TCP-AO advantages over TCP-MD5 in (1.3) of RFC5925).
The patch series starts with six patches that are not specific to TCP-AO
but implement a general crypto facility that we thought is useful
to eliminate code duplication between TCP-MD5SIG and TCP-AO as well as other
crypto users. These six patches are being submitted separately in
a different patchset [1]. Including them here will show better the gain
in code sharing. Next are 18 patches that implement the actual TCP-AO option,
followed by patches implementing selftests.
The patch set was written as a collaboration of three authors (in alphabetical
order): Dmitry Safonov, Francesco Ruggeri and Salam Noureddine. Additional
credits should be given to Prasad Koya, who was involved in early prototyping
a few years back. There is also a separate submission done by Leonard Crestez
whom we thank for his efforts getting an implementation of RFC5925 submitted
for review upstream [2]. This is an independent implementation that makes
different design decisions.
For example, we chose a similar design to the TCP-MD5SIG implementation and
used setsockopts to program per-socket keys, avoiding the extra complexity
of managing a centralized key database in the kernel. A centralized database
in the kernel has dubious benefits since it doesn’t eliminate per-socket
setsockopts needed to specify which sockets need TCP-AO and what are the
currently preferred keys. It also complicates traffic key caching and
preventing deletion of in-use keys.
In this implementation, a centralized database of keys can be thought of
as living in user space and user applications would have to program those
keys on matching sockets. On the server side, the user application programs
keys (MKTS in TCP-AO nomenclature) on the listening socket for all peers that
are expected to connect. Prefix matching on the peer address is supported.
When a peer issues a successful connect, all the MKTs matching the IP address
of the peer are copied to the newly created socket. On the active side,
when a connect() is issued all MKTs that do not match the peer are deleted
from the socket since they will never match the peer. This implementation
uses three setsockopt()s for adding, deleting and modifying keys on a socket.
All three setsockopt()s have extensive sanity checks that prevent
inconsistencies in the keys on a given socket. A getsockopt() is provided
to get key information from any given socket.
Few things to note about this implementation:
- Traffic keys are cached for established connections avoiding the cost of
such calculation for each packet received or sent.
- Great care has been taken to avoid deleting in-use MKTs
as required by the RFC.
- Any crypto algorithm supported by the Linux kernel can be used
to calculate packet hashes.
- Fastopen works with TCP-AO but hasn’t been tested extensively.
- Tested for interop with other major networking vendors (on linux-4.19),
including testing for key rotation and long lived connections.
[1]: https://lore.kernel.org/all/[email protected]/
[2]: https://lore.kernel.org/all/[email protected]/
[3]: https://github.com/0x7f454c46/iperf/tree/tcp-md5-ao
Cc: Andy Lutomirski <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Bob Gilligan <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Francesco Ruggeri <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: Ivan Delalande <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Leonard Crestez <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Salam Noureddine <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Dmitry Safonov (36):
crypto: Introduce crypto_pool
crypto_pool: Add crypto_pool_reserve_scratch()
net/tcp: Separate tcp_md5sig_info allocation into
tcp_md5sig_info_add()
net/tcp: Disable TCP-MD5 static key on tcp_md5sig_info destruction
net/tcp: Use crypto_pool for TCP-MD5
net/ipv6: sr: Switch to using crypto_pool
tcp: Add TCP-AO config and structures
net/tcp: Introduce TCP_AO setsockopt()s
net/tcp: Prevent TCP-MD5 with TCP-AO being set
net/tcp: Calculate TCP-AO traffic keys
net/tcp: Add TCP-AO sign to outgoing packets
net/tcp: Add tcp_parse_auth_options()
net/tcp: Add AO sign to RST packets
net/tcp: Add TCP-AO sign to twsk
net/tcp: Wire TCP-AO to request sockets
net/tcp: Sign SYN-ACK segments with TCP-AO
net/tcp: Verify inbound TCP-AO signed segments
net/tcp: Add TCP-AO segments counters
net/tcp: Add TCP-AO SNE support
net/tcp: Add tcp_hash_fail() ratelimited logs
net/tcp: Ignore specific ICMPs for TCP-AO connections
net/tcp: Add option for TCP-AO to (not) hash header
net/tcp: Add getsockopt(TCP_AO_GET)
net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs)
net/tcp-ao: Add static_key for TCP-AO
selftests/net: Add TCP-AO library
selftests/net: Verify that TCP-AO complies with ignoring ICMPs
selftest/net: Add TCP-AO ICMPs accept test
selftest/tcp-ao: Add a test for MKT matching
selftest/tcp-ao: Add test for TCP-AO add setsockopt() command
selftests/tcp-ao: Add TCP-AO + TCP-MD5 + no sign listen socket tests
selftests/aolib: Add test/benchmark for removing MKTs
selftests/nettest: Remove client_pw
selftest/nettest: Rename md5_prefix* => auth_prefix*
selftests/nettest: Add TCP-AO support
selftests/fcnal-test.sh: Add TCP-AO tests
crypto/Kconfig | 12 +
crypto/Makefile | 1 +
crypto/crypto_pool.c | 338 +++
include/crypto/pool.h | 33 +
include/linux/sockptr.h | 23 +
include/linux/tcp.h | 30 +-
include/net/dropreason.h | 25 +
include/net/seg6_hmac.h | 7 -
include/net/tcp.h | 195 +-
include/net/tcp_ao.h | 305 +++
include/uapi/linux/snmp.h | 5 +
include/uapi/linux/tcp.h | 62 +
net/ipv4/Kconfig | 14 +-
net/ipv4/Makefile | 1 +
net/ipv4/proc.c | 5 +
net/ipv4/syncookies.c | 2 +
net/ipv4/tcp.c | 197 +-
net/ipv4/tcp_ao.c | 2038 +++++++++++++++++
net/ipv4/tcp_input.c | 105 +-
net/ipv4/tcp_ipv4.c | 404 +++-
net/ipv4/tcp_minisocks.c | 37 +-
net/ipv4/tcp_output.c | 192 +-
net/ipv6/Kconfig | 2 +-
net/ipv6/Makefile | 1 +
net/ipv6/seg6.c | 3 -
net/ipv6/seg6_hmac.c | 204 +-
net/ipv6/syncookies.c | 2 +
net/ipv6/tcp_ao.c | 151 ++
net/ipv6/tcp_ipv6.c | 357 ++-
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/net/fcnal-test.sh | 471 +++-
tools/testing/selftests/net/nettest.c | 217 +-
tools/testing/selftests/net/tcp_ao/.gitignore | 2 +
tools/testing/selftests/net/tcp_ao/Makefile | 50 +
.../selftests/net/tcp_ao/bench-lookups.c | 403 ++++
.../selftests/net/tcp_ao/connect-deny.c | 217 ++
tools/testing/selftests/net/tcp_ao/connect.c | 81 +
.../selftests/net/tcp_ao/icmps-accept.c | 1 +
.../selftests/net/tcp_ao/icmps-discard.c | 446 ++++
.../testing/selftests/net/tcp_ao/lib/aolib.h | 336 +++
.../selftests/net/tcp_ao/lib/netlink.c | 341 +++
tools/testing/selftests/net/tcp_ao/lib/proc.c | 267 +++
.../testing/selftests/net/tcp_ao/lib/setup.c | 343 +++
tools/testing/selftests/net/tcp_ao/lib/sock.c | 294 +++
.../testing/selftests/net/tcp_ao/lib/utils.c | 30 +
.../selftests/net/tcp_ao/setsockopt-closed.c | 191 ++
.../selftests/net/tcp_ao/unsigned-md5.c | 524 +++++
47 files changed, 8323 insertions(+), 643 deletions(-)
create mode 100644 crypto/crypto_pool.c
create mode 100644 include/crypto/pool.h
create mode 100644 include/net/tcp_ao.h
create mode 100644 net/ipv4/tcp_ao.c
create mode 100644 net/ipv6/tcp_ao.c
create mode 100644 tools/testing/selftests/net/tcp_ao/.gitignore
create mode 100644 tools/testing/selftests/net/tcp_ao/Makefile
create mode 100644 tools/testing/selftests/net/tcp_ao/bench-lookups.c
create mode 100644 tools/testing/selftests/net/tcp_ao/connect-deny.c
create mode 100644 tools/testing/selftests/net/tcp_ao/connect.c
create mode 120000 tools/testing/selftests/net/tcp_ao/icmps-accept.c
create mode 100644 tools/testing/selftests/net/tcp_ao/icmps-discard.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/aolib.h
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/netlink.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/proc.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/setup.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/sock.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/utils.c
create mode 100644 tools/testing/selftests/net/tcp_ao/setsockopt-closed.c
create mode 100644 tools/testing/selftests/net/tcp_ao/unsigned-md5.c
base-commit: 4dc12f37a8e98e1dca5521c14625c869537b50b6
--
2.38.1
Use crypto_pool API that was designed with tcp_md5sig_pool in mind.
The conversion to use crypto_pool will allow:
- to reuse ahash_request(s) for different users
- to allocate only one per-CPU scratch buffer rather than a new one for
each user
- to have a common API for net/ users that need ahash on RX/TX fast path
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 24 +++------
net/ipv4/Kconfig | 2 +-
net/ipv4/tcp.c | 105 ++++++++++-----------------------------
net/ipv4/tcp_ipv4.c | 90 +++++++++++++++++++--------------
net/ipv4/tcp_minisocks.c | 22 ++++++--
net/ipv6/tcp_ipv6.c | 53 +++++++++-----------
6 files changed, 129 insertions(+), 167 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a0cdf013782a..03dbe1940fec 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1664,12 +1664,6 @@ union tcp_md5sum_block {
#endif
};
-/* - pool: digest algorithm, hash description and scratch buffer */
-struct tcp_md5sig_pool {
- struct ahash_request *md5_req;
- void *scratch;
-};
-
/* - functions */
int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
const struct sock *sk, const struct sk_buff *skb);
@@ -1725,17 +1719,15 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
#define tcp_twsk_md5_key(twsk) NULL
#endif
-bool tcp_alloc_md5sig_pool(void);
-
-struct tcp_md5sig_pool *tcp_get_md5sig_pool(void);
-static inline void tcp_put_md5sig_pool(void)
-{
- local_bh_enable();
-}
+struct crypto_pool_ahash;
+int tcp_md5_alloc_crypto_pool(void);
+void tcp_md5_release_crypto_pool(void);
+void tcp_md5_add_crypto_pool(void);
+extern int tcp_md5_crypto_pool_id;
-int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *,
- unsigned int header_len);
-int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
+int tcp_md5_hash_skb_data(struct crypto_pool_ahash *hp,
+ const struct sk_buff *skb, unsigned int header_len);
+int tcp_md5_hash_key(struct crypto_pool_ahash *hp,
const struct tcp_md5sig_key *key);
/* From tcp_fastopen.c */
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index e983bb0c5012..c341864e4398 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -733,7 +733,7 @@ config DEFAULT_TCP_CONG
config TCP_MD5SIG
bool "TCP: MD5 Signature Option support (RFC2385)"
- select CRYPTO
+ select CRYPTO_POOL
select CRYPTO_MD5
help
RFC2385 specifies a method of giving MD5 protection to TCP sessions.
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 936ed566cc89..d6f494f2c350 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -244,6 +244,7 @@
#define pr_fmt(fmt) "TCP: " fmt
#include <crypto/hash.h>
+#include <crypto/pool.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -4407,98 +4408,45 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
EXPORT_SYMBOL(tcp_getsockopt);
#ifdef CONFIG_TCP_MD5SIG
-static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool);
-static DEFINE_MUTEX(tcp_md5sig_mutex);
-static bool tcp_md5sig_pool_populated = false;
+int tcp_md5_crypto_pool_id = -1;
+EXPORT_SYMBOL(tcp_md5_crypto_pool_id);
-static void __tcp_alloc_md5sig_pool(void)
+int tcp_md5_alloc_crypto_pool(void)
{
- struct crypto_ahash *hash;
- int cpu;
-
- hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(hash))
- return;
-
- for_each_possible_cpu(cpu) {
- void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch;
- struct ahash_request *req;
-
- if (!scratch) {
- scratch = kmalloc_node(sizeof(union tcp_md5sum_block) +
- sizeof(struct tcphdr),
- GFP_KERNEL,
- cpu_to_node(cpu));
- if (!scratch)
- return;
- per_cpu(tcp_md5sig_pool, cpu).scratch = scratch;
- }
- if (per_cpu(tcp_md5sig_pool, cpu).md5_req)
- continue;
-
- req = ahash_request_alloc(hash, GFP_KERNEL);
- if (!req)
- return;
+ int ret;
- ahash_request_set_callback(req, 0, NULL, NULL);
+ ret = crypto_pool_reserve_scratch(sizeof(union tcp_md5sum_block) +
+ sizeof(struct tcphdr));
+ if (ret)
+ return ret;
- per_cpu(tcp_md5sig_pool, cpu).md5_req = req;
+ ret = crypto_pool_alloc_ahash("md5");
+ if (ret >= 0) {
+ tcp_md5_crypto_pool_id = ret;
+ return 0;
}
- /* before setting tcp_md5sig_pool_populated, we must commit all writes
- * to memory. See smp_rmb() in tcp_get_md5sig_pool()
- */
- smp_wmb();
- /* Paired with READ_ONCE() from tcp_alloc_md5sig_pool()
- * and tcp_get_md5sig_pool().
- */
- WRITE_ONCE(tcp_md5sig_pool_populated, true);
+ return ret;
}
+EXPORT_SYMBOL(tcp_md5_alloc_crypto_pool);
-bool tcp_alloc_md5sig_pool(void)
+void tcp_md5_release_crypto_pool(void)
{
- /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */
- if (unlikely(!READ_ONCE(tcp_md5sig_pool_populated))) {
- mutex_lock(&tcp_md5sig_mutex);
-
- if (!tcp_md5sig_pool_populated)
- __tcp_alloc_md5sig_pool();
-
- mutex_unlock(&tcp_md5sig_mutex);
- }
- /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */
- return READ_ONCE(tcp_md5sig_pool_populated);
+ crypto_pool_release(tcp_md5_crypto_pool_id);
}
-EXPORT_SYMBOL(tcp_alloc_md5sig_pool);
+EXPORT_SYMBOL(tcp_md5_release_crypto_pool);
-
-/**
- * tcp_get_md5sig_pool - get md5sig_pool for this user
- *
- * We use percpu structure, so if we succeed, we exit with preemption
- * and BH disabled, to make sure another thread or softirq handling
- * wont try to get same context.
- */
-struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
+void tcp_md5_add_crypto_pool(void)
{
- local_bh_disable();
-
- /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */
- if (READ_ONCE(tcp_md5sig_pool_populated)) {
- /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */
- smp_rmb();
- return this_cpu_ptr(&tcp_md5sig_pool);
- }
- local_bh_enable();
- return NULL;
+ crypto_pool_add(tcp_md5_crypto_pool_id);
}
-EXPORT_SYMBOL(tcp_get_md5sig_pool);
+EXPORT_SYMBOL(tcp_md5_add_crypto_pool);
-int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
+int tcp_md5_hash_skb_data(struct crypto_pool_ahash *hp,
const struct sk_buff *skb, unsigned int header_len)
{
struct scatterlist sg;
const struct tcphdr *tp = tcp_hdr(skb);
- struct ahash_request *req = hp->md5_req;
+ struct ahash_request *req = hp->req;
unsigned int i;
const unsigned int head_data_len = skb_headlen(skb) > header_len ?
skb_headlen(skb) - header_len : 0;
@@ -4532,16 +4480,17 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
}
EXPORT_SYMBOL(tcp_md5_hash_skb_data);
-int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key)
+int tcp_md5_hash_key(struct crypto_pool_ahash *hp,
+ const struct tcp_md5sig_key *key)
{
u8 keylen = READ_ONCE(key->keylen); /* paired with WRITE_ONCE() in tcp_md5_do_add */
struct scatterlist sg;
sg_init_one(&sg, key->key, keylen);
- ahash_request_set_crypt(hp->md5_req, &sg, NULL, keylen);
+ ahash_request_set_crypt(hp->req, &sg, NULL, keylen);
/* We use data_race() because tcp_md5_do_add() might change key->key under us */
- return data_race(crypto_ahash_update(hp->md5_req));
+ return data_race(crypto_ahash_update(hp->req));
}
EXPORT_SYMBOL(tcp_md5_hash_key);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f812d507fc9a..08ffba6c33f4 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -79,6 +79,7 @@
#include <linux/btf_ids.h>
#include <crypto/hash.h>
+#include <crypto/pool.h>
#include <linux/scatterlist.h>
#include <trace/events/tcp.h>
@@ -1223,10 +1224,6 @@ static int __tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
key = sock_kmalloc(sk, sizeof(*key), gfp | __GFP_ZERO);
if (!key)
return -ENOMEM;
- if (!tcp_alloc_md5sig_pool()) {
- sock_kfree_s(sk, key, sizeof(*key));
- return -ENOMEM;
- }
memcpy(key->key, newkey, newkeylen);
key->keylen = newkeylen;
@@ -1248,8 +1245,13 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
struct tcp_sock *tp = tcp_sk(sk);
if (!rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk))) {
- if (tcp_md5sig_info_add(sk, GFP_KERNEL))
+ if (tcp_md5_alloc_crypto_pool())
+ return -ENOMEM;
+
+ if (tcp_md5sig_info_add(sk, GFP_KERNEL)) {
+ tcp_md5_release_crypto_pool();
return -ENOMEM;
+ }
static_branch_inc(&tcp_md5_needed.key);
}
@@ -1266,8 +1268,12 @@ int tcp_md5_key_copy(struct sock *sk, const union tcp_md5_addr *addr,
struct tcp_sock *tp = tcp_sk(sk);
if (!rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk))) {
- if (tcp_md5sig_info_add(sk, sk_gfp_mask(sk, GFP_ATOMIC)))
+ tcp_md5_add_crypto_pool();
+
+ if (tcp_md5sig_info_add(sk, sk_gfp_mask(sk, GFP_ATOMIC))) {
+ tcp_md5_release_crypto_pool();
return -ENOMEM;
+ }
atomic_inc(&tcp_md5_needed.key.key.enabled);
}
@@ -1367,7 +1373,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
cmd.tcpm_key, cmd.tcpm_keylen);
}
-static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
+static int tcp_v4_md5_hash_headers(struct crypto_pool_ahash *hp,
__be32 daddr, __be32 saddr,
const struct tcphdr *th, int nbytes)
{
@@ -1375,7 +1381,7 @@ static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
struct scatterlist sg;
struct tcphdr *_th;
- bp = hp->scratch;
+ bp = hp->base.scratch;
bp->saddr = saddr;
bp->daddr = daddr;
bp->pad = 0;
@@ -1387,37 +1393,34 @@ static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
_th->check = 0;
sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
- ahash_request_set_crypt(hp->md5_req, &sg, NULL,
+ ahash_request_set_crypt(hp->req, &sg, NULL,
sizeof(*bp) + sizeof(*th));
- return crypto_ahash_update(hp->md5_req);
+ return crypto_ahash_update(hp->req);
}
static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
__be32 daddr, __be32 saddr, const struct tcphdr *th)
{
- struct tcp_md5sig_pool *hp;
- struct ahash_request *req;
+ struct crypto_pool_ahash hp;
- hp = tcp_get_md5sig_pool();
- if (!hp)
+ if (crypto_pool_get(tcp_md5_crypto_pool_id, (struct crypto_pool *)&hp))
goto clear_hash_noput;
- req = hp->md5_req;
- if (crypto_ahash_init(req))
+ if (crypto_ahash_init(hp.req))
goto clear_hash;
- if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
+ if (tcp_v4_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2))
goto clear_hash;
- if (tcp_md5_hash_key(hp, key))
+ if (tcp_md5_hash_key(&hp, key))
goto clear_hash;
- ahash_request_set_crypt(req, NULL, md5_hash, 0);
- if (crypto_ahash_final(req))
+ ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(hp.req))
goto clear_hash;
- tcp_put_md5sig_pool();
+ crypto_pool_put();
return 0;
clear_hash:
- tcp_put_md5sig_pool();
+ crypto_pool_put();
clear_hash_noput:
memset(md5_hash, 0, 16);
return 1;
@@ -1427,8 +1430,7 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
const struct sock *sk,
const struct sk_buff *skb)
{
- struct tcp_md5sig_pool *hp;
- struct ahash_request *req;
+ struct crypto_pool_ahash hp;
const struct tcphdr *th = tcp_hdr(skb);
__be32 saddr, daddr;
@@ -1441,29 +1443,27 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
daddr = iph->daddr;
}
- hp = tcp_get_md5sig_pool();
- if (!hp)
+ if (crypto_pool_get(tcp_md5_crypto_pool_id, (struct crypto_pool *)&hp))
goto clear_hash_noput;
- req = hp->md5_req;
- if (crypto_ahash_init(req))
+ if (crypto_ahash_init(hp.req))
goto clear_hash;
- if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len))
+ if (tcp_v4_md5_hash_headers(&hp, daddr, saddr, th, skb->len))
goto clear_hash;
- if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+ if (tcp_md5_hash_skb_data(&hp, skb, th->doff << 2))
goto clear_hash;
- if (tcp_md5_hash_key(hp, key))
+ if (tcp_md5_hash_key(&hp, key))
goto clear_hash;
- ahash_request_set_crypt(req, NULL, md5_hash, 0);
- if (crypto_ahash_final(req))
+ ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(hp.req))
goto clear_hash;
- tcp_put_md5sig_pool();
+ crypto_pool_put();
return 0;
clear_hash:
- tcp_put_md5sig_pool();
+ crypto_pool_put();
clear_hash_noput:
memset(md5_hash, 0, 16);
return 1;
@@ -2286,6 +2286,18 @@ static int tcp_v4_init_sock(struct sock *sk)
return 0;
}
+#ifdef CONFIG_TCP_MD5SIG
+static void tcp_md5sig_info_free_rcu(struct rcu_head *head)
+{
+ struct tcp_md5sig_info *md5sig;
+
+ md5sig = container_of(head, struct tcp_md5sig_info, rcu);
+ kfree(md5sig);
+ static_branch_slow_dec_deferred(&tcp_md5_needed);
+ tcp_md5_release_crypto_pool();
+}
+#endif
+
void tcp_v4_destroy_sock(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -2310,10 +2322,12 @@ void tcp_v4_destroy_sock(struct sock *sk)
#ifdef CONFIG_TCP_MD5SIG
/* Clean up the MD5 key list, if any */
if (tp->md5sig_info) {
+ struct tcp_md5sig_info *md5sig;
+
+ md5sig = rcu_dereference_protected(tp->md5sig_info, 1);
tcp_clear_md5_list(sk);
- kfree_rcu(rcu_dereference_protected(tp->md5sig_info, 1), rcu);
- tp->md5sig_info = NULL;
- static_branch_slow_dec_deferred(&tcp_md5_needed);
+ call_rcu(&md5sig->rcu, tcp_md5sig_info_free_rcu);
+ rcu_assign_pointer(tp->md5sig_info, NULL);
}
#endif
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index fb500160b8d2..f7a75dce140b 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -297,8 +297,10 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
key = tp->af_specific->md5_lookup(sk, sk);
if (key) {
tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC);
- BUG_ON(tcptw->tw_md5_key && !tcp_alloc_md5sig_pool());
+ if (WARN_ON(!tcptw->tw_md5_key))
+ break;
atomic_inc(&tcp_md5_needed.key.key.enabled);
+ tcp_md5_add_crypto_pool();
}
}
} while (0);
@@ -335,16 +337,26 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
}
EXPORT_SYMBOL(tcp_time_wait);
+#ifdef CONFIG_TCP_MD5SIG
+static void tcp_md5_twsk_free_rcu(struct rcu_head *head)
+{
+ struct tcp_md5sig_key *key;
+
+ key = container_of(head, struct tcp_md5sig_key, rcu);
+ kfree(key);
+ static_branch_slow_dec_deferred(&tcp_md5_needed);
+ tcp_md5_release_crypto_pool();
+}
+#endif
+
void tcp_twsk_destructor(struct sock *sk)
{
#ifdef CONFIG_TCP_MD5SIG
if (static_branch_unlikely(&tcp_md5_needed.key)) {
struct tcp_timewait_sock *twsk = tcp_twsk(sk);
- if (twsk->tw_md5_key) {
- kfree_rcu(twsk->tw_md5_key, rcu);
- static_branch_slow_dec_deferred(&tcp_md5_needed);
- }
+ if (twsk->tw_md5_key)
+ call_rcu(&twsk->tw_md5_key->rcu, tcp_md5_twsk_free_rcu);
}
#endif
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f528702185c4..2c5c0ca7de67 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -64,6 +64,7 @@
#include <linux/seq_file.h>
#include <crypto/hash.h>
+#include <crypto/pool.h>
#include <linux/scatterlist.h>
#include <trace/events/tcp.h>
@@ -684,7 +685,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
cmd.tcpm_key, cmd.tcpm_keylen);
}
-static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
+static int tcp_v6_md5_hash_headers(struct crypto_pool_ahash *hp,
const struct in6_addr *daddr,
const struct in6_addr *saddr,
const struct tcphdr *th, int nbytes)
@@ -693,7 +694,7 @@ static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
struct scatterlist sg;
struct tcphdr *_th;
- bp = hp->scratch;
+ bp = hp->base.scratch;
/* 1. TCP pseudo-header (RFC2460) */
bp->saddr = *saddr;
bp->daddr = *daddr;
@@ -705,38 +706,35 @@ static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
_th->check = 0;
sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
- ahash_request_set_crypt(hp->md5_req, &sg, NULL,
+ ahash_request_set_crypt(hp->req, &sg, NULL,
sizeof(*bp) + sizeof(*th));
- return crypto_ahash_update(hp->md5_req);
+ return crypto_ahash_update(hp->req);
}
static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
const struct in6_addr *daddr, struct in6_addr *saddr,
const struct tcphdr *th)
{
- struct tcp_md5sig_pool *hp;
- struct ahash_request *req;
+ struct crypto_pool_ahash hp;
- hp = tcp_get_md5sig_pool();
- if (!hp)
+ if (crypto_pool_get(tcp_md5_crypto_pool_id, (struct crypto_pool *)&hp))
goto clear_hash_noput;
- req = hp->md5_req;
- if (crypto_ahash_init(req))
+ if (crypto_ahash_init(hp.req))
goto clear_hash;
- if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
+ if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2))
goto clear_hash;
- if (tcp_md5_hash_key(hp, key))
+ if (tcp_md5_hash_key(&hp, key))
goto clear_hash;
- ahash_request_set_crypt(req, NULL, md5_hash, 0);
- if (crypto_ahash_final(req))
+ ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(hp.req))
goto clear_hash;
- tcp_put_md5sig_pool();
+ crypto_pool_put();
return 0;
clear_hash:
- tcp_put_md5sig_pool();
+ crypto_pool_put();
clear_hash_noput:
memset(md5_hash, 0, 16);
return 1;
@@ -748,8 +746,7 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
const struct sk_buff *skb)
{
const struct in6_addr *saddr, *daddr;
- struct tcp_md5sig_pool *hp;
- struct ahash_request *req;
+ struct crypto_pool_ahash hp;
const struct tcphdr *th = tcp_hdr(skb);
if (sk) { /* valid for establish/request sockets */
@@ -761,29 +758,27 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
daddr = &ip6h->daddr;
}
- hp = tcp_get_md5sig_pool();
- if (!hp)
+ if (crypto_pool_get(tcp_md5_crypto_pool_id, (struct crypto_pool *)&hp))
goto clear_hash_noput;
- req = hp->md5_req;
- if (crypto_ahash_init(req))
+ if (crypto_ahash_init(hp.req))
goto clear_hash;
- if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
+ if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, skb->len))
goto clear_hash;
- if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+ if (tcp_md5_hash_skb_data(&hp, skb, th->doff << 2))
goto clear_hash;
- if (tcp_md5_hash_key(hp, key))
+ if (tcp_md5_hash_key(&hp, key))
goto clear_hash;
- ahash_request_set_crypt(req, NULL, md5_hash, 0);
- if (crypto_ahash_final(req))
+ ahash_request_set_crypt(hp.req, NULL, md5_hash, 0);
+ if (crypto_ahash_final(hp.req))
goto clear_hash;
- tcp_put_md5sig_pool();
+ crypto_pool_put();
return 0;
clear_hash:
- tcp_put_md5sig_pool();
+ crypto_pool_put();
clear_hash_noput:
memset(md5_hash, 0, 16);
return 1;
--
2.38.1
Introduce new kernel config option and common structures as well as
helpers to be used by TCP-AO code.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/linux/tcp.h | 9 +++-
include/net/tcp.h | 8 +---
include/net/tcp_ao.h | 90 ++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/tcp.h | 2 +
net/ipv4/Kconfig | 12 ++++++
5 files changed, 113 insertions(+), 8 deletions(-)
create mode 100644 include/net/tcp_ao.h
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 41b1da621a45..fd248875b0a9 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -434,13 +434,18 @@ struct tcp_sock {
bool syn_smc; /* SYN includes SMC */
#endif
-#ifdef CONFIG_TCP_MD5SIG
-/* TCP AF-Specific parts; only used by MD5 Signature support so far */
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+/* TCP AF-Specific parts; only used by TCP-AO/MD5 Signature support so far */
const struct tcp_sock_af_ops *af_specific;
+#ifdef CONFIG_TCP_MD5SIG
/* TCP MD5 Signature Option information */
struct tcp_md5sig_info __rcu *md5sig_info;
#endif
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info __rcu *ao_info;
+#endif
+#endif
/* TCP fastopen related information */
struct tcp_fastopen_request *fastopen_req;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 03dbe1940fec..3395a925dc6e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -37,6 +37,7 @@
#include <net/snmp.h>
#include <net/ip.h>
#include <net/tcp_states.h>
+#include <net/tcp_ao.h>
#include <net/inet_ecn.h>
#include <net/dst.h>
#include <net/mptcp.h>
@@ -1615,12 +1616,7 @@ static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp)
tp->retransmit_skb_hint = NULL;
}
-union tcp_md5_addr {
- struct in_addr a4;
-#if IS_ENABLED(CONFIG_IPV6)
- struct in6_addr a6;
-#endif
-};
+#define tcp_md5_addr tcp_ao_addr
/* - key database */
struct tcp_md5sig_key {
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
new file mode 100644
index 000000000000..39b3fc31e5a1
--- /dev/null
+++ b/include/net/tcp_ao.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _TCP_AO_H
+#define _TCP_AO_H
+
+#define TCP_AO_MAX_HASH_SIZE 64
+#define TCP_AO_KEY_ALIGN 1
+#define __tcp_ao_key_align __aligned(TCP_AO_KEY_ALIGN)
+
+union tcp_ao_addr {
+ struct in_addr a4;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct in6_addr a6;
+#endif
+};
+
+struct tcp_ao_hdr {
+ u8 kind;
+ u8 length;
+ u8 keyid;
+ u8 rnext_keyid;
+};
+
+struct tcp_ao_key {
+ struct hlist_node node;
+ union tcp_ao_addr addr;
+ u8 key[TCP_AO_MAXKEYLEN] __tcp_ao_key_align;
+ unsigned int crypto_pool_id;
+ u16 port;
+ u8 prefixlen;
+ u8 family;
+ u8 keylen;
+ u8 keyflags;
+ u8 sndid;
+ u8 rcvid;
+ u8 maclen;
+ u8 digest_size;
+ struct rcu_head rcu;
+ u8 traffic_keys[];
+};
+
+static inline u8 *rcv_other_key(struct tcp_ao_key *key)
+{
+ return key->traffic_keys;
+}
+
+static inline u8 *snd_other_key(struct tcp_ao_key *key)
+{
+ return key->traffic_keys + key->digest_size;
+}
+
+static inline int tcp_ao_maclen(const struct tcp_ao_key *key)
+{
+ return key->maclen;
+}
+
+static inline int tcp_ao_sizeof_key(const struct tcp_ao_key *key)
+{
+ return sizeof(struct tcp_ao_key) + (TCP_AO_MAX_HASH_SIZE << 1);
+}
+
+static inline int tcp_ao_len(const struct tcp_ao_key *key)
+{
+ return tcp_ao_maclen(key) + sizeof(struct tcp_ao_hdr);
+}
+
+static inline unsigned int tcp_ao_digest_size(struct tcp_ao_key *key)
+{
+ return key->digest_size;
+}
+
+struct tcp_ao_info {
+ struct hlist_head head;
+ struct rcu_head rcu;
+ /* current_key and rnext_key aren't maintained on listen sockets.
+ * Their purpose is to cache keys on established connections,
+ * saving needless lookups. Never dereference any of them from
+ * listen sockets.
+ */
+ struct tcp_ao_key *volatile current_key;
+ struct tcp_ao_key *rnext_key;
+ u8 ao_flags;
+ __be32 lisn;
+ __be32 risn;
+ u32 snd_sne;
+ u32 snd_sne_seq;
+ u32 rcv_sne;
+ u32 rcv_sne_seq;
+};
+
+#endif /* _TCP_AO_H */
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 8fc09e8638b3..849bbf2d3c38 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -342,6 +342,8 @@ struct tcp_diag_md5sig {
__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN];
};
+#define TCP_AO_MAXKEYLEN 80
+
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index c341864e4398..4a78f3e0199e 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -731,6 +731,18 @@ config DEFAULT_TCP_CONG
default "bbr" if DEFAULT_BBR
default "cubic"
+config TCP_AO
+ bool "TCP: Authentication Option (RFC5925)"
+ select CRYPTO
+ select CRYPTO_POOL
+ depends on 64BIT # seq-number extension needs WRITE_ONCE(u64)
+ default y
+ help
+ TCP-AO specifies the use of stronger Message Authentication Codes (MACs),
+ protects against replays for long-lived TCP connections, and
+ provides more details on the association of security with TCP
+ connections than TCP MD5 (See RFC5925)
+
config TCP_MD5SIG
bool "TCP: MD5 Signature Option support (RFC2385)"
select CRYPTO_POOL
--
2.38.1
Add 3 setsockopt()s:
1. to add a new Master Key Tuple (MKT) on a socket
2. to delete present MKT from a socket
3. to change flags of an MKT
Userspace has to introduce keys on every socket it wants to use TCP-AO
option on, similarly to TCP_MD5SIG/TCP_MD5SIG_EXT.
RFC5925 prohibits definition of MKTs that would match the same peer,
so do sanity checks on the data provided by userspace. Be as
conservative as possible, including refusal of defining MKT on
an established connection with no AO, removing the key in-use and etc.
(1) and (2) are to be used by userspace key manager to add/remove keys.
(3) main purpose is to set rnext_key, which (as prescribed by RFC5925)
is the key id that will be requested in TCP-AO header from the peer to
sign their segments with.
At this moment the life of ao_info ends in tcp_v4_destroy_sock().
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/linux/sockptr.h | 23 ++
include/net/tcp.h | 6 +
include/net/tcp_ao.h | 15 +
include/uapi/linux/tcp.h | 35 ++
net/ipv4/Makefile | 1 +
net/ipv4/tcp.c | 17 +
net/ipv4/tcp_ao.c | 849 +++++++++++++++++++++++++++++++++++++++
net/ipv4/tcp_ipv4.c | 10 +-
net/ipv6/Makefile | 1 +
net/ipv6/tcp_ao.c | 20 +
net/ipv6/tcp_ipv6.c | 39 +-
11 files changed, 999 insertions(+), 17 deletions(-)
create mode 100644 net/ipv4/tcp_ao.c
create mode 100644 net/ipv6/tcp_ao.c
diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
index bae5e2369b4f..307961b41541 100644
--- a/include/linux/sockptr.h
+++ b/include/linux/sockptr.h
@@ -55,6 +55,29 @@ static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
return copy_from_sockptr_offset(dst, src, 0, size);
}
+static inline int copy_struct_from_sockptr(void *dst, size_t ksize,
+ sockptr_t src, size_t usize)
+{
+ size_t size = min(ksize, usize);
+ size_t rest = max(ksize, usize) - size;
+
+ if (!sockptr_is_kernel(src))
+ return copy_struct_from_user(dst, ksize, src.user, size);
+
+ if (usize < ksize) {
+ memset(dst + size, 0, rest);
+ } else if (usize > ksize) {
+ char *p = src.kernel;
+
+ while (rest--) {
+ if (*p++)
+ return -E2BIG;
+ }
+ }
+ memcpy(dst, src.kernel, size);
+ return 0;
+}
+
static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
const void *src, size_t size)
{
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3395a925dc6e..dc0ceeb20886 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2064,6 +2064,12 @@ struct tcp_sock_af_ops {
sockptr_t optval,
int optlen);
#endif
+#ifdef CONFIG_TCP_AO
+ int (*ao_parse)(struct sock *sk,
+ int optname,
+ sockptr_t optval,
+ int optlen);
+#endif
};
struct tcp_request_sock_ops {
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 39b3fc31e5a1..6d0d30e5542b 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -87,4 +87,19 @@ struct tcp_ao_info {
u32 rcv_sne_seq;
};
+#ifdef CONFIG_TCP_AO
+int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
+ sockptr_t optval, int optlen);
+void tcp_ao_destroy_sock(struct sock *sk);
+/* ipv4 specific functions */
+int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen);
+/* ipv6 specific functions */
+int tcp_v6_parse_ao(struct sock *sk, int cmd,
+ sockptr_t optval, int optlen);
+#else
+static inline void tcp_ao_destroy_sock(struct sock *sk)
+{
+}
+#endif
+
#endif /* _TCP_AO_H */
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 849bbf2d3c38..5369458ae89f 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -129,6 +129,9 @@ enum {
#define TCP_TX_DELAY 37 /* delay outgoing packets by XX usec */
+#define TCP_AO 38 /* (Add/Set MKT) */
+#define TCP_AO_DEL 39 /* (Delete MKT) */
+#define TCP_AO_MOD 40 /* (Modify MKT) */
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF 0
@@ -344,6 +347,38 @@ struct tcp_diag_md5sig {
#define TCP_AO_MAXKEYLEN 80
+#define TCP_AO_CMDF_CURR (1 << 0) /* Only checks field sndid */
+#define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */
+
+struct tcp_ao { /* setsockopt(TCP_AO) */
+ struct __kernel_sockaddr_storage tcpa_addr;
+ char tcpa_alg_name[64];
+ __u16 tcpa_flags;
+ __u8 tcpa_prefix;
+ __u8 tcpa_sndid;
+ __u8 tcpa_rcvid;
+ __u8 tcpa_maclen;
+ __u8 tcpa_keyflags;
+ __u8 tcpa_keylen;
+ __u8 tcpa_key[TCP_AO_MAXKEYLEN];
+} __attribute__((aligned(8)));
+
+struct tcp_ao_del { /* setsockopt(TCP_AO_DEL) */
+ struct __kernel_sockaddr_storage tcpa_addr;
+ __u16 tcpa_flags;
+ __u8 tcpa_prefix;
+ __u8 tcpa_sndid;
+ __u8 tcpa_rcvid;
+ __u8 tcpa_current;
+ __u8 tcpa_rnext;
+} __attribute__((aligned(8)));
+
+struct tcp_ao_mod { /* setsockopt(TCP_AO_MOD) */
+ __u16 tcpa_flags;
+ __u8 tcpa_current;
+ __u8 tcpa_rnext;
+} __attribute__((aligned(8)));
+
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index bbdd9c44f14e..6d0b3e228b8a 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
xfrm4_output.o xfrm4_protocol.o
+obj-$(CONFIG_TCP_AO) += tcp_ao.o
ifeq ($(CONFIG_BPF_JIT),y)
obj-$(CONFIG_BPF_SYSCALL) += bpf_tcp_ca.o
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index d6f494f2c350..27662c9b0870 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3712,6 +3712,23 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname,
__tcp_sock_set_quickack(sk, val);
break;
+#ifdef CONFIG_TCP_AO
+ case TCP_AO:
+ case TCP_AO_DEL:
+ case TCP_AO_MOD: {
+ /* If this is the first TCP-AO setsockopt() on the socket,
+ * sk_state has to be LISTEN or CLOSE
+ */
+ if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) ||
+ rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk)))
+ err = tp->af_specific->ao_parse(sk, optname, optval,
+ optlen);
+ else
+ err = -EISCONN;
+ break;
+ }
+#endif
#ifdef CONFIG_TCP_MD5SIG
case TCP_MD5SIG:
case TCP_MD5SIG_EXT:
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
new file mode 100644
index 000000000000..a573b630ed9d
--- /dev/null
+++ b/net/ipv4/tcp_ao.c
@@ -0,0 +1,849 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * INET An implementation of the TCP Authentication Option (TCP-AO).
+ * See RFC5925.
+ *
+ * Authors: Dmitry Safonov <[email protected]>
+ * Francesco Ruggeri <[email protected]>
+ * Salam Noureddine <[email protected]>
+ */
+#define pr_fmt(fmt) "TCP: " fmt
+
+#include <linux/inetdevice.h>
+#include <linux/tcp.h>
+#include <crypto/pool.h>
+
+#include <net/tcp.h>
+#include <net/ipv6.h>
+
+static struct tcp_ao_key *tcp_ao_do_lookup_rcvid(struct sock *sk, u8 keyid)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_ao_key *key;
+ struct tcp_ao_info *ao;
+
+ ao = rcu_dereference_check(tp->ao_info, lockdep_sock_is_held(sk));
+
+ if (!ao)
+ return NULL;
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ if (key->rcvid == keyid)
+ return key;
+ }
+ return NULL;
+}
+
+struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid)
+{
+ struct tcp_ao_key *key;
+ struct tcp_ao_info *ao;
+
+ ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao)
+ return NULL;
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ if (key->sndid == keyid)
+ return key;
+ }
+ return NULL;
+}
+
+static inline int ipv4_prefix_cmp(const struct in_addr *addr1,
+ const struct in_addr *addr2,
+ unsigned int prefixlen)
+{
+ __be32 mask = inet_make_mask(prefixlen);
+
+ if ((addr1->s_addr & mask) == (addr2->s_addr & mask))
+ return 0;
+ return ((addr1->s_addr & mask) > (addr2->s_addr & mask)) ? 1 : -1;
+}
+
+static int __tcp_ao_key_cmp(const struct tcp_ao_key *key,
+ const union tcp_ao_addr *addr, u8 prefixlen,
+ int family, int sndid, int rcvid, u16 port)
+{
+ if (sndid >= 0 && key->sndid != sndid)
+ return (key->sndid > sndid) ? 1 : -1;
+ if (rcvid >= 0 && key->rcvid != rcvid)
+ return (key->rcvid > rcvid) ? 1 : -1;
+ if (port != 0 && key->port != 0 && port != key->port)
+ return (key->port > port) ? 1 : -1;
+
+ if (family == AF_UNSPEC)
+ return 0;
+ if (key->family != family)
+ return (key->family > family) ? 1 : -1;
+
+ if (family == AF_INET) {
+ if (key->addr.a4.s_addr == INADDR_ANY)
+ return 0;
+ if (addr->a4.s_addr == INADDR_ANY)
+ return 0;
+ return ipv4_prefix_cmp(&key->addr.a4, &addr->a4, prefixlen);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ if (ipv6_addr_any(&key->addr.a6) || ipv6_addr_any(&addr->a6))
+ return 0;
+ if (ipv6_prefix_equal(&key->addr.a6, &addr->a6, prefixlen))
+ return 0;
+ return memcmp(&key->addr.a6, &addr->a6, prefixlen);
+#endif
+ }
+ return -1;
+}
+
+static int tcp_ao_key_cmp(const struct tcp_ao_key *key,
+ const union tcp_ao_addr *addr, u8 prefixlen,
+ int family, int sndid, int rcvid, u16 port)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ if (family == AF_INET6 && ipv6_addr_v4mapped(&addr->a6)) {
+ __be32 addr4 = addr->a6.s6_addr32[3];
+
+ return __tcp_ao_key_cmp(key, (union tcp_ao_addr *)&addr4,
+ prefixlen, AF_INET, sndid, rcvid, port);
+ }
+#endif
+ return __tcp_ao_key_cmp(key, addr, prefixlen, family, sndid, rcvid, port);
+}
+
+struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
+ const union tcp_ao_addr *addr,
+ int family, int sndid, int rcvid, u16 port)
+{
+ struct tcp_ao_key *key;
+ struct tcp_ao_info *ao;
+
+ ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao)
+ return NULL;
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ if (!tcp_ao_key_cmp(key, addr, key->prefixlen,
+ family, sndid, rcvid, port))
+ return key;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(tcp_ao_do_lookup);
+
+static struct tcp_ao_info *tcp_ao_alloc_info(gfp_t flags,
+ struct tcp_ao_info *cloned_from)
+{
+ struct tcp_ao_info *ao;
+
+ ao = kzalloc(sizeof(*ao), flags);
+ if (!ao)
+ return NULL;
+ INIT_HLIST_HEAD(&ao->head);
+
+ if (cloned_from)
+ ao->ao_flags = cloned_from->ao_flags;
+ return ao;
+}
+
+static void tcp_ao_link_mkt(struct tcp_ao_info *ao, struct tcp_ao_key *mkt)
+{
+ hlist_add_head_rcu(&mkt->node, &ao->head);
+}
+
+static void tcp_ao_key_free_rcu(struct rcu_head *head)
+{
+ struct tcp_ao_key *key = container_of(head, struct tcp_ao_key, rcu);
+
+ crypto_pool_release(key->crypto_pool_id);
+ kfree(key);
+}
+
+void tcp_ao_destroy_sock(struct sock *sk)
+{
+ struct tcp_ao_info *ao;
+ struct tcp_ao_key *key;
+ struct hlist_node *n;
+
+ ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
+ tcp_sk(sk)->ao_info = NULL;
+
+ if (!ao)
+ return;
+
+ hlist_for_each_entry_safe(key, n, &ao->head, node) {
+ hlist_del_rcu(&key->node);
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ call_rcu(&key->rcu, tcp_ao_key_free_rcu);
+ }
+
+ kfree_rcu(ao, rcu);
+}
+
+static int tcp_ao_current_rnext(struct sock *sk, u16 tcpa_flags,
+ u8 tcpa_sndid, u8 tcpa_rcvid)
+{
+ struct tcp_ao_info *ao_info;
+ struct tcp_ao_key *key;
+
+ ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if ((tcpa_flags & (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)) && !ao_info)
+ return -EINVAL;
+
+ if (tcpa_flags & TCP_AO_CMDF_CURR) {
+ key = tcp_ao_do_lookup_sndid(sk, tcpa_sndid);
+ if (!key)
+ return -ENOENT;
+ if (ao_info->current_key != key)
+ WRITE_ONCE(ao_info->current_key, key);
+ }
+
+ if (tcpa_flags & TCP_AO_CMDF_NEXT) {
+ key = tcp_ao_do_lookup_rcvid(sk, tcpa_rcvid);
+ if (!key)
+ return -ENOENT;
+ if (ao_info->rnext_key != key)
+ WRITE_ONCE(ao_info->rnext_key, key);
+ }
+
+ return 0;
+}
+
+static int tcp_ao_verify_port(struct sock *sk, u16 port)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (port != 0) /* FIXME */
+ return -EINVAL;
+
+ /* Check that MKT port is consistent with socket */
+ if (port != 0 && inet->inet_dport != 0 && port != inet->inet_dport)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int tcp_ao_verify_ipv4(struct sock *sk, struct tcp_ao *cmd,
+ union tcp_md5_addr **addr, u16 *port)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)&cmd->tcpa_addr;
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (sin->sin_family != AF_INET)
+ return -EINVAL;
+
+ if (tcp_ao_verify_port(sk, ntohs(sin->sin_port)))
+ return -EINVAL;
+
+ /* Check prefix and trailing 0's in addr */
+ if (cmd->tcpa_prefix != 0) {
+ __be32 mask;
+
+ if (sin->sin_addr.s_addr == INADDR_ANY)
+ return -EINVAL;
+ if (cmd->tcpa_prefix > 32)
+ return -EINVAL;
+
+ mask = inet_make_mask(cmd->tcpa_prefix);
+ if (sin->sin_addr.s_addr & ~mask)
+ return -EINVAL;
+
+ /* Check that MKT address is consistent with socket */
+ if (inet->inet_daddr != INADDR_ANY &&
+ (inet->inet_daddr & mask) != sin->sin_addr.s_addr)
+ return -EINVAL;
+ } else {
+ if (sin->sin_addr.s_addr != INADDR_ANY)
+ return -EINVAL;
+ }
+
+ *addr = (union tcp_md5_addr *)&sin->sin_addr;
+ *port = ntohs(sin->sin_port);
+ return 0;
+}
+
+static int tcp_ao_parse_crypto(struct tcp_ao *cmd, struct tcp_ao_key *key)
+{
+ unsigned int syn_tcp_option_space;
+ struct crypto_pool_ahash hp;
+ bool is_kdf_aes_128_cmac = false;
+ struct crypto_ahash *tfm;
+ int err, pool_id;
+
+ /* Force null-termination of tcpa_alg_name */
+ cmd->tcpa_alg_name[ARRAY_SIZE(cmd->tcpa_alg_name) - 1] = '\0';
+
+ /* RFC5926, 3.1.1.2. KDF_AES_128_CMAC */
+ if (!strcmp("cmac(aes128)", cmd->tcpa_alg_name)) {
+ strcpy(cmd->tcpa_alg_name, "cmac(aes)");
+ is_kdf_aes_128_cmac = (cmd->tcpa_keylen != 16);
+ }
+
+ key->maclen = cmd->tcpa_maclen ?: 12; /* 12 is the default in RFC5925 */
+
+ /* Check: maclen + tcp-ao header <= (MAX_TCP_OPTION_SPACE - mss
+ * - tstamp - wscale - sackperm),
+ * see tcp_syn_options(), tcp_synack_options(), commit 33ad798c924b.
+ *
+ * In order to allow D-SACK with TCP-AO, the header size should be:
+ * (MAX_TCP_OPTION_SPACE - TCPOLEN_TSTAMP_ALIGNED
+ * - TCPOLEN_SACK_BASE_ALIGNED
+ * - 2 * TCPOLEN_SACK_PERBLOCK) = 8 (maclen = 4),
+ * see tcp_established_options().
+ *
+ * RFC5925, 2.2:
+ * Typical MACs are 96-128 bits (12-16 bytes), but any length
+ * that fits in the header of the segment being authenticated
+ * is allowed.
+ *
+ * RFC5925, 7.6:
+ * TCP-AO continues to consume 16 bytes in non-SYN segments,
+ * leaving a total of 24 bytes for other options, of which
+ * the timestamp consumes 10. This leaves 14 bytes, of which 10
+ * are used for a single SACK block. When two SACK blocks are used,
+ * such as to handle D-SACK, a smaller TCP-AO MAC would be required
+ * to make room for the additional SACK block (i.e., to leave 18
+ * bytes for the D-SACK variant of the SACK option) [RFC2883].
+ * Note that D-SACK is not supportable in TCP MD5 in the presence
+ * of timestamps, because TCP MD5’s MAC length is fixed and too
+ * large to leave sufficient option space.
+ */
+ syn_tcp_option_space = MAX_TCP_OPTION_SPACE;
+ syn_tcp_option_space -= TCPOLEN_TSTAMP_ALIGNED;
+ syn_tcp_option_space -= TCPOLEN_WSCALE_ALIGNED;
+ syn_tcp_option_space -= TCPOLEN_SACKPERM_ALIGNED;
+ if (tcp_ao_len(key) > syn_tcp_option_space)
+ return -EMSGSIZE;
+
+ key->keylen = cmd->tcpa_keylen;
+ memcpy(key->key, cmd->tcpa_key, cmd->tcpa_keylen);
+
+ pool_id = crypto_pool_alloc_ahash(cmd->tcpa_alg_name);
+ if (pool_id < 0)
+ return pool_id;
+
+ if (is_kdf_aes_128_cmac) {
+ err = crypto_pool_reserve_scratch(16);
+ if (err)
+ goto err_free_pool;
+ }
+
+ err = crypto_pool_get(pool_id, (struct crypto_pool *)&hp);
+ if (err)
+ goto err_free_pool;
+
+ tfm = crypto_ahash_reqtfm(hp.req);
+ if (crypto_ahash_alignmask(tfm) > TCP_AO_KEY_ALIGN) {
+ err = -EOPNOTSUPP;
+ goto err_put_pool;
+ }
+
+ if (is_kdf_aes_128_cmac) {
+ void *scratch = hp.base.scratch;
+ struct scatterlist sg;
+
+ /* Using zero-key of 16 bytes as described in RFC5926 */
+ memset(scratch, 0, 16);
+ sg_init_one(&sg, cmd->tcpa_key, cmd->tcpa_keylen);
+
+ err = crypto_ahash_setkey(tfm, scratch, 16);
+ if (err)
+ goto err_put_pool;
+
+ err = crypto_ahash_init(hp.req);
+ if (err)
+ goto err_put_pool;
+
+ ahash_request_set_crypt(hp.req, &sg, key->key, cmd->tcpa_keylen);
+ err = crypto_ahash_update(hp.req);
+ if (err)
+ goto err_put_pool;
+
+ err |= crypto_ahash_final(hp.req);
+ if (err)
+ goto err_put_pool;
+ key->keylen = 16;
+ }
+
+ err = crypto_ahash_setkey(tfm, key->key, key->keylen);
+ if (err)
+ goto err_put_pool;
+
+ key->digest_size = crypto_ahash_digestsize(tfm);
+ crypto_pool_put();
+
+ err = crypto_pool_reserve_scratch(sizeof(struct tcphdr) +
+ sizeof(struct tcp_ao_hdr) +
+ key->digest_size);
+ if (err)
+ goto err_free_pool;
+
+ if (key->digest_size > TCP_AO_MAX_HASH_SIZE) {
+ err = -ENOBUFS;
+ goto err_free_pool;
+ }
+ if (key->maclen > key->digest_size) {
+ err = -EINVAL;
+ goto err_free_pool;
+ }
+
+ key->crypto_pool_id = pool_id;
+ return 0;
+
+err_put_pool:
+ crypto_pool_put();
+err_free_pool:
+ crypto_pool_release(pool_id);
+ return err;
+}
+
+/* tcp_ao_mkt_overlap_v4() assumes cmd already went through tcp_ao_verify_ipv4.
+ * RFC5925 3.1 The IDs of MKTs MUST NOT overlap where their TCP connection
+ * identifiers overlap.
+ */
+static bool tcp_ao_mkt_overlap_v4(struct tcp_ao *cmd,
+ struct tcp_ao_info *ao_info)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)&cmd->tcpa_addr;
+ __be32 addr = sin->sin_addr.s_addr;
+ __u8 prefix = cmd->tcpa_prefix;
+ __u16 port = ntohs(sin->sin_port);
+ __u8 sndid = cmd->tcpa_sndid;
+ __u8 rcvid = cmd->tcpa_rcvid;
+ struct tcp_ao_key *key;
+
+ /* Check for TCP connection identifiers overlap */
+
+ hlist_for_each_entry_rcu(key, &ao_info->head, node) {
+ __be32 key_addr;
+ __be32 mask;
+
+ /* Check for overlapping ids */
+ if (key->sndid != sndid && key->rcvid != rcvid)
+ continue;
+
+ key_addr = key->addr.a4.s_addr;
+ mask = inet_make_mask(min(prefix, key->prefixlen));
+
+ /* Check for overlapping addresses */
+ if (addr == INADDR_ANY || key_addr == INADDR_ANY ||
+ (addr & mask) == (key_addr & mask)) {
+ /* Check for overlapping ports */
+ if (port == 0 || key->port == 0 || port == key->port)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao *cmd,
+ union tcp_md5_addr **paddr, u16 *port,
+ unsigned short int *family)
+{
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd->tcpa_addr;
+ struct in6_addr *addr = &sin6->sin6_addr;
+ u8 prefix = cmd->tcpa_prefix;
+
+ if (sin6->sin6_family != AF_INET6)
+ return -EINVAL;
+ /* Not supposed to happen: here from af-specific callback */
+ if (WARN_ON_ONCE(!sk_fullsock(sk)))
+ return -EINVAL;
+
+ if (tcp_ao_verify_port(sk, ntohs(sin6->sin6_port)))
+ return -EINVAL;
+
+ /* Check prefix and trailing 0's in addr */
+ if (cmd->tcpa_prefix != 0 && ipv6_addr_v4mapped(addr)) {
+ __be32 addr4 = addr->s6_addr32[3];
+ __be32 mask;
+
+ if (prefix > 32 || addr4 == INADDR_ANY)
+ return -EINVAL;
+
+ mask = inet_make_mask(prefix);
+ if (addr4 & ~mask)
+ return -EINVAL;
+
+ /* Check that MKT address is consistent with socket */
+ if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
+ __be32 daddr4 = sk->sk_v6_daddr.s6_addr32[3];
+
+ if (!ipv6_addr_v4mapped(&sk->sk_v6_daddr))
+ return -EINVAL;
+ if ((daddr4 & mask) != addr4)
+ return -EINVAL;
+ }
+
+ *paddr = (union tcp_md5_addr *)&addr->s6_addr32[3];
+ *family = AF_INET;
+ *port = ntohs(sin6->sin6_port);
+ return 0;
+ } else if (cmd->tcpa_prefix != 0) {
+ struct in6_addr pfx;
+
+ if (ipv6_addr_any(addr) || prefix > 128)
+ return -EINVAL;
+
+ ipv6_addr_prefix(&pfx, addr, prefix);
+ if (ipv6_addr_cmp(&pfx, addr))
+ return -EINVAL;
+
+ /* Check that MKT address is consistent with socket */
+ if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
+ !ipv6_prefix_equal(&sk->sk_v6_daddr, addr, prefix))
+
+ return -EINVAL;
+ } else {
+ if (!ipv6_addr_any(addr))
+ return -EINVAL;
+ }
+
+ *paddr = (union tcp_md5_addr *)addr;
+ *port = ntohs(sin6->sin6_port);
+ return 0;
+}
+
+/* tcp_ao_mkt_overlap_v6() assumes cmd already went through tcp_ao_verify_ipv6.
+ * RFC5925 3.1 The IDs of MKTs MUST NOT overlap where their TCP connection
+ * identifiers overlap.
+ */
+static bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
+ struct tcp_ao_info *ao_info)
+{
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd->tcpa_addr;
+ struct in6_addr *addr = &sin6->sin6_addr;
+ bool v4_mapped = ipv6_addr_v4mapped(addr);
+ __u8 prefix = cmd->tcpa_prefix;
+ __u16 port = ntohs(sin6->sin6_port);
+ __u8 sndid = cmd->tcpa_sndid;
+ __u8 rcvid = cmd->tcpa_rcvid;
+ struct tcp_ao_key *key;
+ __be32 addr4 = v4_mapped ? addr->s6_addr32[3] : 0;
+
+ hlist_for_each_entry_rcu(key, &ao_info->head, node) {
+ struct in6_addr pfx, key_pfx;
+ struct in6_addr *key_addr;
+ int min_prefixlen;
+
+ /* Check for overlapping ids */
+ if (key->sndid != sndid && key->rcvid != rcvid)
+ continue;
+
+ key_addr = &key->addr.a6;
+
+ if (v4_mapped) {
+ __be32 key_addr4;
+ __be32 mask;
+
+ if (!ipv6_addr_v4mapped(key_addr))
+ continue;
+
+ key_addr4 = key_addr->s6_addr32[3];
+ mask = inet_make_mask(min(prefix, key->prefixlen));
+
+ /* Check for overlapping addresses */
+ if (addr4 == INADDR_ANY || key_addr4 == INADDR_ANY ||
+ (addr4 & mask) == (key_addr4 & mask)) {
+ /* Check for overlapping ports */
+ if (port == 0 || key->port == 0 ||
+ port == key->port)
+ return true;
+ }
+ } else {
+ min_prefixlen = min(prefix, key->prefixlen);
+ ipv6_addr_prefix(&pfx, addr, min_prefixlen);
+ ipv6_addr_prefix(&key_pfx, key_addr, min_prefixlen);
+
+ /* Check for overlapping addresses */
+ if (ipv6_addr_any(addr) || ipv6_addr_any(key_addr) ||
+ !ipv6_addr_cmp(&pfx, &key_pfx)) {
+ /* Check for overlapping ports */
+ if (port == 0 || key->port == 0 ||
+ port == key->port)
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+#else
+static inline int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao *cmd,
+ union tcp_md5_addr **paddr, u16 *port,
+ unsigned short int *family)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
+ struct tcp_ao_info *ao_info)
+{
+ return false;
+}
+#endif
+
+#define TCP_AO_KEYF_ALL (0)
+#define TCP_AO_CMDF_ADDMOD_VALID \
+ (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
+#define TCP_AO_CMDF_DEL_VALID \
+ (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
+
+static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
+ sockptr_t optval, int optlen)
+{
+ struct tcp_ao_info *ao_info;
+ union tcp_md5_addr *addr;
+ struct tcp_ao_key *key;
+ bool first = false;
+ struct tcp_ao cmd;
+ int ret, size;
+ u16 port;
+
+ if (optlen < sizeof(cmd))
+ return -EINVAL;
+
+ ret = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen);
+ if (ret)
+ return ret;
+
+ if (cmd.tcpa_keylen > TCP_AO_MAXKEYLEN)
+ return -EINVAL;
+
+ if (cmd.tcpa_flags & ~TCP_AO_CMDF_ADDMOD_VALID)
+ return -EINVAL;
+
+ if (family == AF_INET)
+ ret = tcp_ao_verify_ipv4(sk, &cmd, &addr, &port);
+ else
+ ret = tcp_ao_verify_ipv6(sk, &cmd, &addr, &port, &family);
+ if (ret)
+ return ret;
+
+ if (cmd.tcpa_keyflags & ~TCP_AO_KEYF_ALL)
+ return -EINVAL;
+
+ ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+
+ if (!ao_info) {
+ ao_info = tcp_ao_alloc_info(GFP_KERNEL, NULL);
+ if (!ao_info)
+ return -ENOMEM;
+ first = true;
+ } else {
+ if (family == AF_INET) {
+ if (tcp_ao_mkt_overlap_v4(&cmd, ao_info))
+ return -EEXIST;
+ } else {
+ if (tcp_ao_mkt_overlap_v6(&cmd, ao_info))
+ return -EEXIST;
+ }
+ }
+
+ /* TODO: We should add twice the key->diget_size instead of the max
+ * so rework this in a way to know the digest_size before allocating
+ * the tcp_ao_key struct.
+ */
+ size = sizeof(struct tcp_ao_key) + (TCP_AO_MAX_HASH_SIZE << 1);
+ key = sock_kmalloc(sk, size, GFP_KERNEL);
+ if (!key) {
+ ret = -ENOMEM;
+ goto err_free_ao;
+ }
+
+ INIT_HLIST_NODE(&key->node);
+ memcpy(&key->addr, addr, (family == AF_INET) ? sizeof(struct in_addr) :
+ sizeof(struct in6_addr));
+ key->port = port;
+ key->prefixlen = cmd.tcpa_prefix;
+ key->family = family;
+ key->keyflags = cmd.tcpa_keyflags;
+ key->sndid = cmd.tcpa_sndid;
+ key->rcvid = cmd.tcpa_rcvid;
+
+ ret = tcp_ao_parse_crypto(&cmd, key);
+ if (ret < 0)
+ goto err_free_sock;
+
+ tcp_ao_link_mkt(ao_info, key);
+ if (first) {
+ sk_gso_disable(sk);
+ rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info);
+ }
+
+ /* Can't fail: the key with sndid/rcvid was just added */
+ WARN_ON_ONCE(tcp_ao_current_rnext(sk, cmd.tcpa_flags,
+ cmd.tcpa_sndid, cmd.tcpa_rcvid));
+ return 0;
+
+err_free_sock:
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ kfree(key);
+err_free_ao:
+ if (first)
+ kfree(ao_info);
+ return ret;
+}
+
+static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_key *key,
+ struct tcp_ao_info *ao_info,
+ struct tcp_ao_del *cmd)
+{
+ int err;
+
+ hlist_del_rcu(&key->node);
+
+ /* At this moment another CPU could have looked this key up
+ * while it was unlinked from the list. Wait for RCU grace period,
+ * after which the key is off-list and can't be looked up again;
+ * the rx path [just before RCU came] might have used it and set it
+ * as current_key (very unlikely).
+ */
+ synchronize_rcu();
+ err = tcp_ao_current_rnext(sk, cmd->tcpa_flags,
+ cmd->tcpa_current, cmd->tcpa_rnext);
+ if (err)
+ goto add_key;
+
+ if (unlikely(READ_ONCE(ao_info->current_key) == key ||
+ READ_ONCE(ao_info->rnext_key) == key)) {
+ err = -EBUSY;
+ goto add_key;
+ }
+
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ call_rcu(&key->rcu, tcp_ao_key_free_rcu);
+
+ return 0;
+add_key:
+ hlist_add_head_rcu(&key->node, &ao_info->head);
+ return err;
+}
+
+static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family,
+ sockptr_t optval, int optlen)
+{
+ struct tcp_ao_info *ao_info;
+ struct tcp_ao_key *key;
+ struct tcp_ao_del cmd;
+ int err;
+ union tcp_md5_addr *addr;
+ __u8 prefix;
+ __be16 port;
+ int addr_len;
+
+ if (optlen < sizeof(cmd))
+ return -EINVAL;
+
+ err = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen);
+ if (err)
+ return err;
+
+ if (cmd.tcpa_flags & ~TCP_AO_CMDF_DEL_VALID)
+ return -EINVAL;
+
+ ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao_info)
+ return -ENOENT;
+
+ if (family == AF_INET) {
+ struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpa_addr;
+
+ addr = (union tcp_md5_addr *)&sin->sin_addr;
+ addr_len = sizeof(struct in_addr);
+ port = ntohs(sin->sin_port);
+ } else {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpa_addr;
+ struct in6_addr *addr6 = &sin6->sin6_addr;
+
+ if (ipv6_addr_v4mapped(addr6)) {
+ addr = (union tcp_md5_addr *)&addr6->s6_addr32[3];
+ addr_len = sizeof(struct in_addr);
+ family = AF_INET;
+ } else {
+ addr = (union tcp_md5_addr *)addr6;
+ addr_len = sizeof(struct in6_addr);
+ }
+ port = ntohs(sin6->sin6_port);
+ }
+ prefix = cmd.tcpa_prefix;
+
+ /* We could choose random present key here for current/rnext
+ * but that's less predictable. Let's be strict and don't
+ * allow removing a key that's in use. RFC5925 doesn't
+ * specify how-to coordinate key removal, but says:
+ * "It is presumed that an MKT affecting a particular
+ * connection cannot be destroyed during an active connection"
+ */
+ hlist_for_each_entry_rcu(key, &ao_info->head, node) {
+ if (cmd.tcpa_sndid != key->sndid ||
+ cmd.tcpa_rcvid != key->rcvid)
+ continue;
+
+ if (family != key->family ||
+ prefix != key->prefixlen ||
+ port != key->port ||
+ memcmp(addr, &key->addr, addr_len))
+ continue;
+
+ return tcp_ao_delete_key(sk, key, ao_info, &cmd);
+ }
+ return -ENOENT;
+}
+
+static int tcp_ao_mod_cmd(struct sock *sk, unsigned short int family,
+ sockptr_t optval, int optlen)
+{
+ struct tcp_ao_info *ao_info;
+ struct tcp_ao_mod cmd;
+ int err;
+
+ if (optlen < sizeof(cmd))
+ return -EINVAL;
+
+ err = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen);
+ if (err)
+ return err;
+
+ if (cmd.tcpa_flags & ~TCP_AO_CMDF_ADDMOD_VALID)
+ return -EINVAL;
+
+ ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao_info)
+ return -ENOENT;
+ /* TODO: make tcp_ao_current_rnext() and flags set atomic */
+ return tcp_ao_current_rnext(sk, cmd.tcpa_flags,
+ cmd.tcpa_current, cmd.tcpa_rnext);
+}
+
+int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
+ sockptr_t optval, int optlen)
+{
+ if (WARN_ON_ONCE(family != AF_INET && family != AF_INET6))
+ return -EOPNOTSUPP;
+
+ switch (cmd) {
+ case TCP_AO:
+ return tcp_ao_add_cmd(sk, family, optval, optlen);
+ case TCP_AO_DEL:
+ return tcp_ao_del_cmd(sk, family, optval, optlen);
+ case TCP_AO_MOD:
+ return tcp_ao_mod_cmd(sk, family, optval, optlen);
+ default:
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+ }
+}
+
+int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen)
+{
+ return tcp_parse_ao(sk, cmd, AF_INET, optval, optlen);
+}
+
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 08ffba6c33f4..3bafa31b066d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2260,11 +2260,16 @@ const struct inet_connection_sock_af_ops ipv4_specific = {
};
EXPORT_SYMBOL(ipv4_specific);
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
+#ifdef CONFIG_TCP_MD5SIG
.md5_lookup = tcp_v4_md5_lookup,
.calc_md5_hash = tcp_v4_md5_hash_skb,
.md5_parse = tcp_v4_parse_md5_keys,
+#endif
+#ifdef CONFIG_TCP_AO
+ .ao_parse = tcp_v4_parse_ao,
+#endif
};
#endif
@@ -2279,7 +2284,7 @@ static int tcp_v4_init_sock(struct sock *sk)
icsk->icsk_af_ops = &ipv4_specific;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific;
#endif
@@ -2330,6 +2335,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
rcu_assign_pointer(tp->md5sig_info, NULL);
}
#endif
+ tcp_ao_destroy_sock(sk);
/* Clean up a referenced TCP bind bucket. */
if (inet_csk(sk)->icsk_bind_hash)
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 3036a45e8a1e..d283c59df4c1 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -52,4 +52,5 @@ obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
ifneq ($(CONFIG_IPV6),)
obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o
obj-y += mcast_snoop.o
+obj-$(CONFIG_TCP_AO) += tcp_ao.o
endif
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
new file mode 100644
index 000000000000..f9f242a7e0f2
--- /dev/null
+++ b/net/ipv6/tcp_ao.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * INET An implementation of the TCP Authentication Option (TCP-AO).
+ * See RFC5925.
+ *
+ * Authors: Dmitry Safonov <[email protected]>
+ * Francesco Ruggeri <[email protected]>
+ * Salam Noureddine <[email protected]>
+ */
+#include <linux/tcp.h>
+#include <crypto/pool.h>
+
+#include <net/tcp.h>
+#include <net/ipv6.h>
+
+int tcp_v6_parse_ao(struct sock *sk, int cmd,
+ sockptr_t optval, int optlen)
+{
+ return tcp_parse_ao(sk, cmd, AF_INET6, optval, optlen);
+}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2c5c0ca7de67..ba60c1273517 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -77,16 +77,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
static const struct inet_connection_sock_af_ops ipv6_mapped;
const struct inet_connection_sock_af_ops ipv6_specific;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
-#else
-static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
- const struct in6_addr *addr,
- int l3index)
-{
- return NULL;
-}
#endif
/* Helper returning the inet6 address from a given tcp socket.
@@ -244,7 +237,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
if (sk_is_mptcp(sk))
mptcpv6_handle_mapped(sk, true);
sk->sk_backlog_rcv = tcp_v4_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
@@ -257,7 +250,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
if (sk_is_mptcp(sk))
mptcpv6_handle_mapped(sk, false);
sk->sk_backlog_rcv = tcp_v6_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
tp->af_specific = &tcp_sock_ipv6_specific;
#endif
goto failure;
@@ -783,7 +776,13 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
memset(md5_hash, 0, 16);
return 1;
}
-
+#else /* CONFIG_TCP_MD5SIG */
+static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
+ const struct in6_addr *addr,
+ int l3index)
+{
+ return NULL;
+}
#endif
static void tcp_v6_init_req(struct request_sock *req,
@@ -1243,7 +1242,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
if (sk_is_mptcp(newsk))
mptcpv6_handle_mapped(newsk, true);
newsk->sk_backlog_rcv = tcp_v4_do_rcv;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
@@ -1907,11 +1906,16 @@ const struct inet_connection_sock_af_ops ipv6_specific = {
.mtu_reduced = tcp_v6_mtu_reduced,
};
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
+#ifdef CONFIG_TCP_MD5SIG
.md5_lookup = tcp_v6_md5_lookup,
.calc_md5_hash = tcp_v6_md5_hash_skb,
.md5_parse = tcp_v6_parse_md5_keys,
+#endif
+#ifdef CONFIG_TCP_AO
+ .ao_parse = tcp_v6_parse_ao,
+#endif
};
#endif
@@ -1933,11 +1937,16 @@ static const struct inet_connection_sock_af_ops ipv6_mapped = {
.mtu_reduced = tcp_v4_mtu_reduced,
};
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
+#ifdef CONFIG_TCP_MD5SIG
.md5_lookup = tcp_v4_md5_lookup,
.calc_md5_hash = tcp_v4_md5_hash_skb,
.md5_parse = tcp_v6_parse_md5_keys,
+#endif
+#ifdef CONFIG_TCP_AO
+ .ao_parse = tcp_v6_parse_ao,
+#endif
};
#endif
@@ -1952,7 +1961,7 @@ static int tcp_v6_init_sock(struct sock *sk)
icsk->icsk_af_ops = &ipv6_specific;
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
#endif
--
2.38.1
Be as conservative as possible: if there is TCP-MD5 key for a given peer
regardless of L3 interface - don't allow setting TCP-AO key for the same
peer. According to RFC5925, TCP-AO is supposed to replace TCP-MD5 and
there can't be any switch between both on any connected tuple.
Later it can be relaxed, if there's a use, but in the beginning restrict
any intersection.
Note: it's still should be possible to set both TCP-MD5 and TCP-AO keys
on a listening socket for *different* peers.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 23 +++++++++++++++++++++--
include/net/tcp_ao.h | 15 +++++++++++++++
net/ipv4/tcp_ao.c | 12 ++++++++++++
net/ipv4/tcp_ipv4.c | 10 ++++++++--
net/ipv4/tcp_output.c | 22 ++++++++++++++++++++++
net/ipv6/tcp_ao.c | 17 +++++++++++++++++
net/ipv6/tcp_ipv6.c | 22 ++++++++++++++++++----
7 files changed, 113 insertions(+), 8 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index dc0ceeb20886..e5ccc58562a7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1680,14 +1680,23 @@ struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
extern struct static_key_false_deferred tcp_md5_needed;
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr,
- int family);
+ int family, bool any_l3index);
static inline struct tcp_md5sig_key *
tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr, int family)
{
if (!static_branch_unlikely(&tcp_md5_needed.key))
return NULL;
- return __tcp_md5_do_lookup(sk, l3index, addr, family);
+ return __tcp_md5_do_lookup(sk, l3index, addr, family, false);
+}
+
+static inline struct tcp_md5sig_key *
+tcp_md5_do_lookup_any_l3index(const struct sock *sk,
+ const union tcp_md5_addr *addr, int family)
+{
+ if (!static_branch_unlikely(&tcp_md5_needed.key))
+ return NULL;
+ return __tcp_md5_do_lookup(sk, 0, addr, family, true);
}
enum skb_drop_reason
@@ -1705,6 +1714,13 @@ tcp_md5_do_lookup(const struct sock *sk, int l3index,
return NULL;
}
+static inline struct tcp_md5sig_key *
+tcp_md5_do_lookup_any_l3index(const struct sock *sk,
+ const union tcp_md5_addr *addr, int family)
+{
+ return NULL;
+}
+
static inline enum skb_drop_reason
tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
const void *saddr, const void *daddr,
@@ -2069,6 +2085,9 @@ struct tcp_sock_af_ops {
int optname,
sockptr_t optval,
int optlen);
+ struct tcp_ao_key *(*ao_lookup)(const struct sock *sk,
+ struct sock *addr_sk,
+ int sndid, int rcvid);
#endif
};
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 6d0d30e5542b..c550f1a6f5fd 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -91,12 +91,27 @@ struct tcp_ao_info {
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
void tcp_ao_destroy_sock(struct sock *sk);
+struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
+ const union tcp_ao_addr *addr,
+ int family, int sndid, int rcvid, u16 port);
/* ipv4 specific functions */
int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen);
+struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
+ int sndid, int rcvid);
/* ipv6 specific functions */
+struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
+ struct sock *addr_sk,
+ int sndid, int rcvid);
int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen);
#else
+static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
+ const union tcp_ao_addr *addr,
+ int family, int sndid, int rcvid, u16 port)
+{
+ return NULL;
+}
+
static inline void tcp_ao_destroy_sock(struct sock *sk)
{
}
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index a573b630ed9d..27cf844ed8a5 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -181,6 +181,14 @@ void tcp_ao_destroy_sock(struct sock *sk)
kfree_rcu(ao, rcu);
}
+struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
+ int sndid, int rcvid)
+{
+ union tcp_ao_addr *addr = (union tcp_ao_addr *)&addr_sk->sk_daddr;
+
+ return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0);
+}
+
static int tcp_ao_current_rnext(struct sock *sk, u16 tcpa_flags,
u8 tcpa_sndid, u8 tcpa_rcvid)
{
@@ -627,6 +635,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
if (cmd.tcpa_keyflags & ~TCP_AO_KEYF_ALL)
return -EINVAL;
+ /* Don't allow keys for peers that have a matching TCP-MD5 key */
+ if (tcp_md5_do_lookup_any_l3index(sk, addr, family))
+ return -EKEYREJECTED;
+
ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
lockdep_sock_is_held(sk));
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3bafa31b066d..2fb41e5e90ef 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1085,7 +1085,7 @@ static bool better_md5_match(struct tcp_md5sig_key *old, struct tcp_md5sig_key *
/* Find the Key structure for an address. */
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr,
- int family)
+ int family, bool any_l3index)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *key;
@@ -1104,7 +1104,8 @@ struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
lockdep_sock_is_held(sk)) {
if (key->family != family)
continue;
- if (key->flags & TCP_MD5SIG_FLAG_IFINDEX && key->l3index != l3index)
+ if (!any_l3index && key->flags & TCP_MD5SIG_FLAG_IFINDEX &&
+ key->l3index != l3index)
continue;
if (family == AF_INET) {
mask = inet_make_mask(key->prefixlen);
@@ -1369,6 +1370,10 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
return -EINVAL;
+ /* Don't allow keys for peers that have a matching TCP-AO key */
+ if (tcp_ao_do_lookup(sk, addr, AF_INET, -1, -1, 0))
+ return -EKEYREJECTED;
+
return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags,
cmd.tcpm_key, cmd.tcpm_keylen);
}
@@ -2268,6 +2273,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
.md5_parse = tcp_v4_parse_md5_keys,
#endif
#ifdef CONFIG_TCP_AO
+ .ao_lookup = tcp_v4_ao_lookup,
.ao_parse = tcp_v4_parse_ao,
#endif
};
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 86e71c8c76bc..3ad0dcf98083 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3842,6 +3842,28 @@ int tcp_connect(struct sock *sk)
tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_CONNECT_CB, 0, NULL);
+#if defined(CONFIG_TCP_MD5SIG) && defined(CONFIG_TCP_AO)
+ /* Has to be checked late, after setting daddr/saddr/ops */
+ if (unlikely(rcu_dereference_protected(tp->md5sig_info,
+ lockdep_sock_is_held(sk)))) {
+ bool needs_md5 = !!tp->af_specific->md5_lookup(sk, sk);
+ bool needs_ao = !!tp->af_specific->ao_lookup(sk, sk, -1, -1);
+
+ if (needs_md5 && needs_ao)
+ return -EKEYREJECTED;
+ }
+#endif
+#ifdef CONFIG_TCP_AO
+ if (unlikely(rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held(sk)))) {
+ /* Don't allow connecting if ao is configured but no
+ * matching key is found.
+ */
+ if (!tp->af_specific->ao_lookup(sk, sk, -1, -1))
+ return -EKEYREJECTED;
+ }
+#endif
+
if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk))
return -EHOSTUNREACH; /* Routing failure or similar. */
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
index f9f242a7e0f2..221b8adb4f73 100644
--- a/net/ipv6/tcp_ao.c
+++ b/net/ipv6/tcp_ao.c
@@ -13,6 +13,23 @@
#include <net/tcp.h>
#include <net/ipv6.h>
+struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk,
+ const struct in6_addr *addr,
+ int sndid, int rcvid)
+{
+ return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)addr, AF_INET6,
+ sndid, rcvid, 0);
+}
+
+struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
+ struct sock *addr_sk,
+ int sndid, int rcvid)
+{
+ struct in6_addr *addr = &addr_sk->sk_v6_daddr;
+
+ return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid);
+}
+
int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen)
{
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index ba60c1273517..6f71a2855753 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -614,6 +614,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
{
struct tcp_md5sig cmd;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
+ union tcp_ao_addr *addr;
int l3index = 0;
u8 prefixlen;
u8 flags;
@@ -668,13 +669,24 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
return -EINVAL;
- if (ipv6_addr_v4mapped(&sin6->sin6_addr))
- return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
+ if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
+ addr = (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3];
+
+ /* Don't allow keys for peers that have a matching TCP-AO key */
+ if (tcp_ao_do_lookup(sk, addr, AF_INET, -1, -1, 0))
+ return -EKEYREJECTED;
+ return tcp_md5_do_add(sk, addr,
AF_INET, prefixlen, l3index, flags,
cmd.tcpm_key, cmd.tcpm_keylen);
+ }
+
+ addr = (union tcp_md5_addr *)&sin6->sin6_addr;
+
+ /* Don't allow keys for peers that have a matching TCP-AO key */
+ if (tcp_ao_do_lookup(sk, addr, AF_INET6, -1, -1, 0))
+ return -EKEYREJECTED;
- return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
- AF_INET6, prefixlen, l3index, flags,
+ return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags,
cmd.tcpm_key, cmd.tcpm_keylen);
}
@@ -1914,6 +1926,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
.md5_parse = tcp_v6_parse_md5_keys,
#endif
#ifdef CONFIG_TCP_AO
+ .ao_lookup = tcp_v6_ao_lookup,
.ao_parse = tcp_v6_parse_ao,
#endif
};
@@ -1945,6 +1958,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
.md5_parse = tcp_v6_parse_md5_keys,
#endif
#ifdef CONFIG_TCP_AO
+ .ao_lookup = tcp_v6_ao_lookup,
.ao_parse = tcp_v6_parse_ao,
#endif
};
--
2.38.1
Add traffic key calculation the way it's described in RFC5926.
Wire it up to tcp_finish_connect() and cache the new keys straight away
on already established TCP connections.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 5 ++
include/net/tcp_ao.h | 44 ++++++++++-
net/ipv4/tcp_ao.c | 180 ++++++++++++++++++++++++++++++++++++++++++
net/ipv4/tcp_input.c | 1 +
net/ipv4/tcp_ipv4.c | 1 +
net/ipv4/tcp_output.c | 1 +
net/ipv6/tcp_ao.c | 40 ++++++++++
net/ipv6/tcp_ipv6.c | 1 +
8 files changed, 272 insertions(+), 1 deletion(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e5ccc58562a7..a61235437326 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2088,6 +2088,11 @@ struct tcp_sock_af_ops {
struct tcp_ao_key *(*ao_lookup)(const struct sock *sk,
struct sock *addr_sk,
int sndid, int rcvid);
+ int (*ao_calc_key_sk)(struct tcp_ao_key *mkt,
+ u8 *key,
+ const struct sock *sk,
+ __be32 sisn, __be32 disn,
+ bool send);
#endif
};
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index c550f1a6f5fd..f83a4d09a4ce 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -88,9 +88,33 @@ struct tcp_ao_info {
};
#ifdef CONFIG_TCP_AO
+/* TCP-AO structures and functions */
+
+struct tcp4_ao_context {
+ __be32 saddr;
+ __be32 daddr;
+ __be16 sport;
+ __be16 dport;
+ __be32 sisn;
+ __be32 disn;
+};
+
+struct tcp6_ao_context {
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+ __be16 sport;
+ __be16 dport;
+ __be32 sisn;
+ __be32 disn;
+};
+
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
+int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
+ unsigned int len);
void tcp_ao_destroy_sock(struct sock *sk);
+int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
+ struct tcp_ao_key *ao_key);
struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port);
@@ -98,13 +122,23 @@ struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int sndid, int rcvid);
+int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
+ const struct sock *sk,
+ __be32 sisn, __be32 disn, bool send);
/* ipv6 specific functions */
+int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
+ const struct sock *sk, __be32 sisn,
+ __be32 disn, bool send);
struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
struct sock *addr_sk,
int sndid, int rcvid);
int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen);
-#else
+void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb);
+void tcp_ao_connect_init(struct sock *sk);
+
+#else /* CONFIG_TCP_AO */
+
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port)
@@ -115,6 +149,14 @@ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
static inline void tcp_ao_destroy_sock(struct sock *sk)
{
}
+
+static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
+{
+}
+
+static inline void tcp_ao_connect_init(struct sock *sk)
+{
+}
#endif
#endif /* _TCP_AO_H */
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 27cf844ed8a5..d0f5021c4e0f 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -16,6 +16,42 @@
#include <net/tcp.h>
#include <net/ipv6.h>
+int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
+ unsigned int len)
+{
+ struct crypto_pool_ahash hp;
+ struct scatterlist sg;
+ int ret;
+
+ if (crypto_pool_get(mkt->crypto_pool_id, (struct crypto_pool *)&hp))
+ goto clear_hash_noput;
+
+ if (crypto_ahash_setkey(crypto_ahash_reqtfm(hp.req),
+ mkt->key, mkt->keylen))
+ goto clear_hash;
+
+ ret = crypto_ahash_init(hp.req);
+ if (ret)
+ goto clear_hash;
+
+ sg_init_one(&sg, ctx, len);
+ ahash_request_set_crypt(hp.req, &sg, key, len);
+ crypto_ahash_update(hp.req);
+
+ /* TODO: Revisit on how to get different output length */
+ ret = crypto_ahash_final(hp.req);
+ if (ret)
+ goto clear_hash;
+
+ crypto_pool_put();
+ return 0;
+clear_hash:
+ crypto_pool_put();
+clear_hash_noput:
+ memset(key, 0, tcp_ao_digest_size(mkt));
+ return 1;
+}
+
static struct tcp_ao_key *tcp_ao_do_lookup_rcvid(struct sock *sk, u8 keyid)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -181,6 +217,47 @@ void tcp_ao_destroy_sock(struct sock *sk)
kfree_rcu(ao, rcu);
}
+/* 4 tuple and ISNs are expected in NBO */
+static int tcp_v4_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
+ __be32 saddr, __be32 daddr,
+ __be16 sport, __be16 dport,
+ __be32 sisn, __be32 disn)
+{
+ /* See RFC5926 3.1.1 */
+ struct kdf_input_block {
+ u8 counter;
+ u8 label[6];
+ struct tcp4_ao_context ctx;
+ __be16 outlen;
+ } __packed tmp;
+
+ tmp.counter = 1;
+ memcpy(tmp.label, "TCP-AO", 6);
+ tmp.ctx.saddr = saddr;
+ tmp.ctx.daddr = daddr;
+ tmp.ctx.sport = sport;
+ tmp.ctx.dport = dport;
+ tmp.ctx.sisn = sisn;
+ tmp.ctx.disn = disn;
+ tmp.outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */
+
+ return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp));
+}
+
+int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
+ const struct sock *sk,
+ __be32 sisn, __be32 disn, bool send)
+{
+ if (send)
+ return tcp_v4_ao_calc_key(mkt, key, sk->sk_rcv_saddr,
+ sk->sk_daddr, htons(sk->sk_num),
+ sk->sk_dport, sisn, disn);
+ else
+ return tcp_v4_ao_calc_key(mkt, key, sk->sk_daddr,
+ sk->sk_rcv_saddr, sk->sk_dport,
+ htons(sk->sk_num), disn, sisn);
+}
+
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int sndid, int rcvid)
{
@@ -189,6 +266,103 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0);
}
+int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
+ struct tcp_ao_key *ao_key)
+{
+ u8 *traffic_key = snd_other_key(ao_key);
+ int ret;
+
+ ret = tcp_sk(sk)->af_specific->ao_calc_key_sk(ao_key, traffic_key, sk,
+ ao->lisn, ao->risn, true);
+ if (ret)
+ return ret;
+
+ traffic_key = rcv_other_key(ao_key);
+ return tcp_sk(sk)->af_specific->ao_calc_key_sk(ao_key, traffic_key, sk,
+ ao->lisn, ao->risn,
+ false);
+}
+
+void tcp_ao_connect_init(struct sock *sk)
+{
+ struct tcp_ao_info *ao_info;
+ struct tcp_ao_key *key;
+ struct tcp_sock *tp = tcp_sk(sk);
+ union tcp_ao_addr *addr;
+ int family;
+
+ ao_info = rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao_info)
+ return;
+
+ /* Remove all keys that don't match the peer */
+ family = sk->sk_family;
+ if (family == AF_INET)
+ addr = (union tcp_ao_addr *)&sk->sk_daddr;
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (family == AF_INET6)
+ addr = (union tcp_ao_addr *)&sk->sk_v6_daddr;
+#endif
+ else
+ return;
+
+ hlist_for_each_entry_rcu(key, &ao_info->head, node) {
+ if (tcp_ao_key_cmp(key, addr, key->prefixlen, family,
+ -1, -1, sk->sk_dport) == 0)
+ continue;
+
+ if (key == ao_info->current_key)
+ ao_info->current_key = NULL;
+ if (key == ao_info->rnext_key)
+ ao_info->rnext_key = NULL;
+ hlist_del_rcu(&key->node);
+ crypto_pool_release(key->crypto_pool_id);
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ kfree_rcu(key, rcu);
+ }
+
+ key = tp->af_specific->ao_lookup(sk, sk, -1, -1);
+ if (key) {
+ /* if current_key or rnext_key were not provided,
+ * use the first key matching the peer
+ */
+ if (!ao_info->current_key)
+ ao_info->current_key = key;
+ if (!ao_info->rnext_key)
+ ao_info->rnext_key = key;
+ tp->tcp_header_len += tcp_ao_len(key);
+
+ ao_info->lisn = htonl(tp->write_seq);
+ ao_info->snd_sne = 0;
+ ao_info->snd_sne_seq = tp->write_seq;
+ } else {
+ WARN_ON_ONCE(1);
+ rcu_assign_pointer(tp->ao_info, NULL);
+ kfree(ao_info);
+ }
+}
+
+void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
+{
+ struct tcp_ao_info *ao;
+ struct tcp_ao_key *key;
+
+ ao = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao)
+ return;
+
+ ao->risn = tcp_hdr(skb)->seq;
+
+ ao->rcv_sne = 0;
+ ao->rcv_sne_seq = ntohl(tcp_hdr(skb)->seq);
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ tcp_ao_cache_traffic_keys(sk, ao, key);
+ }
+}
+
static int tcp_ao_current_rnext(struct sock *sk, u16 tcpa_flags,
u8 tcpa_sndid, u8 tcpa_rcvid)
{
@@ -682,6 +856,12 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
if (ret < 0)
goto err_free_sock;
+ /* Change this condition if we allow adding keys in states
+ * like close_wait, syn_sent or fin_wait...
+ */
+ if (sk->sk_state == TCP_ESTABLISHED)
+ tcp_ao_cache_traffic_keys(sk, ao_info, key);
+
tcp_ao_link_mkt(ao_info, key);
if (first) {
sk_gso_disable(sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0640453fce54..0e753a2f84e4 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6052,6 +6052,7 @@ void tcp_finish_connect(struct sock *sk, struct sk_buff *skb)
struct tcp_sock *tp = tcp_sk(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
+ tcp_ao_finish_connect(sk, skb);
tcp_set_state(sk, TCP_ESTABLISHED);
icsk->icsk_ack.lrcvtime = tcp_jiffies32;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 2fb41e5e90ef..feeece12ec9a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2275,6 +2275,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
#ifdef CONFIG_TCP_AO
.ao_lookup = tcp_v4_ao_lookup,
.ao_parse = tcp_v4_parse_ao,
+ .ao_calc_key_sk = tcp_v4_ao_calc_key_sk,
#endif
};
#endif
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 3ad0dcf98083..6f32169df180 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3666,6 +3666,7 @@ static void tcp_connect_init(struct sock *sk)
if (tp->af_specific->md5_lookup(sk, sk))
tp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
+ tcp_ao_connect_init(sk);
/* If user gave his TCP_MAXSEG, record it to clamp */
if (tp->rx_opt.user_mss)
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
index 221b8adb4f73..888ee6242334 100644
--- a/net/ipv6/tcp_ao.c
+++ b/net/ipv6/tcp_ao.c
@@ -13,6 +13,46 @@
#include <net/tcp.h>
#include <net/ipv6.h>
+int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __be16 sport, __be16 dport,
+ __be32 sisn, __be32 disn)
+{
+ struct kdf_input_block {
+ u8 counter;
+ u8 label[6];
+ struct tcp6_ao_context ctx;
+ __be16 outlen;
+ } __packed tmp;
+
+ tmp.counter = 1;
+ memcpy(tmp.label, "TCP-AO", 6);
+ tmp.ctx.saddr = *saddr;
+ tmp.ctx.daddr = *daddr;
+ tmp.ctx.sport = sport;
+ tmp.ctx.dport = dport;
+ tmp.ctx.sisn = sisn;
+ tmp.ctx.disn = disn;
+ tmp.outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */
+
+ return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp));
+}
+
+int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
+ const struct sock *sk, __be32 sisn,
+ __be32 disn, bool send)
+{
+ if (send)
+ return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_rcv_saddr,
+ &sk->sk_v6_daddr, htons(sk->sk_num),
+ sk->sk_dport, sisn, disn);
+ else
+ return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_daddr,
+ &sk->sk_v6_rcv_saddr, sk->sk_dport,
+ htons(sk->sk_num), disn, sisn);
+}
+
struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk,
const struct in6_addr *addr,
int sndid, int rcvid)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 6f71a2855753..cce2cae402bd 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1928,6 +1928,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
#ifdef CONFIG_TCP_AO
.ao_lookup = tcp_v6_ao_lookup,
.ao_parse = tcp_v6_parse_ao,
+ .ao_calc_key_sk = tcp_v6_ao_calc_key_sk,
#endif
};
#endif
--
2.38.1
Wire up sending resets to TCP-AO hashing.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp_ao.h | 7 ++++
net/ipv4/tcp_ao.c | 53 ++++++++++++++++++++++++
net/ipv4/tcp_ipv4.c | 68 +++++++++++++++++++++++++++----
net/ipv6/tcp_ipv6.c | 96 ++++++++++++++++++++++++++++++++++++++------
4 files changed, 203 insertions(+), 21 deletions(-)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 7b38ac70416f..d359fbf89da8 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -114,6 +114,7 @@ int tcp_ao_hash_skb(unsigned short int family,
const u8 *tkey, int hash_offset, u32 sne);
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
+struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid);
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len);
void tcp_ao_destroy_sock(struct sock *sk);
@@ -123,6 +124,12 @@ int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port);
+int tcp_ao_hash_hdr(unsigned short family, char *ao_hash,
+ struct tcp_ao_key *key, const u8 *tkey,
+ const union tcp_ao_addr *daddr,
+ const union tcp_ao_addr *saddr,
+ const struct tcphdr *th, u32 sne);
+
/* ipv4 specific functions */
int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index bae6cca26fc5..e20e3b435ce1 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -421,6 +421,59 @@ static int tcp_ao_hash_skb_data(struct crypto_pool_ahash *hp,
return 0;
}
+int tcp_ao_hash_hdr(unsigned short int family, char *ao_hash,
+ struct tcp_ao_key *key, const u8 *tkey,
+ const union tcp_ao_addr *daddr,
+ const union tcp_ao_addr *saddr,
+ const struct tcphdr *th, u32 sne)
+{
+ struct crypto_pool_ahash hp;
+ int tkey_len = tcp_ao_digest_size(key);
+ int hash_offset = ao_hash - (char *)th;
+
+ if (crypto_pool_get(key->crypto_pool_id, (struct crypto_pool *)&hp))
+ goto clear_hash_noput;
+
+ if (crypto_ahash_setkey(crypto_ahash_reqtfm(hp.req), tkey, tkey_len))
+ goto clear_hash;
+
+ if (crypto_ahash_init(hp.req))
+ goto clear_hash;
+
+ if (tcp_ao_hash_sne(&hp, sne))
+ goto clear_hash;
+ if (family == AF_INET) {
+ if (tcp_v4_ao_hash_pseudoheader(&hp, daddr->a4.s_addr,
+ saddr->a4.s_addr, th->doff * 4))
+ goto clear_hash;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (family == AF_INET6) {
+ if (tcp_v6_ao_hash_pseudoheader(&hp, &daddr->a6,
+ &saddr->a6, th->doff * 4))
+ goto clear_hash;
+#endif
+ } else {
+ WARN_ON_ONCE(1);
+ goto clear_hash;
+ }
+ if (tcp_ao_hash_header(&hp, th, false,
+ ao_hash, hash_offset, tcp_ao_maclen(key)))
+ goto clear_hash;
+ ahash_request_set_crypt(hp.req, NULL, ao_hash, 0);
+ if (crypto_ahash_final(hp.req))
+ goto clear_hash;
+
+ crypto_pool_put();
+ return 0;
+
+clear_hash:
+ crypto_pool_put();
+clear_hash_noput:
+ memset(ao_hash, 0, tcp_ao_maclen(key));
+ return 1;
+}
+EXPORT_SYMBOL(tcp_ao_hash_hdr);
+
int tcp_ao_hash_skb(unsigned short int family,
char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1c014b326ee6..b76933bb073e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -696,16 +696,24 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
__be32 opt[OPTION_BYTES / sizeof(__be32)];
} rep;
struct ip_reply_arg arg;
+ u64 transmit_time = 0;
+ struct sock *ctl_sk;
+ struct net *net;
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+ const __u8 *md5_hash_location = NULL;
+ const struct tcp_ao_hdr *aoh;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key = NULL;
- const __u8 *md5_hash_location = NULL;
unsigned char newhash[16];
- int genhash;
struct sock *sk1 = NULL;
+ int genhash;
+#endif
+#ifdef CONFIG_TCP_AO
+ char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+ struct tcp_ao_key *ao_key = NULL;
+ u32 ao_sne;
+#endif
#endif
- u64 transmit_time = 0;
- struct sock *ctl_sk;
- struct net *net;
/* Never send a reset in response to a reset. */
if (th->rst)
@@ -737,12 +745,14 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
arg.iov[0].iov_len = sizeof(rep.th);
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
/* Invalid TCP option size or twice included auth */
- if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, NULL))
+ if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, &aoh))
return;
rcu_read_lock();
+#endif
+#ifdef CONFIG_TCP_MD5SIG
if (sk && sk_fullsock(sk)) {
const union tcp_md5_addr *addr;
int l3index;
@@ -803,6 +813,48 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
key, ip_hdr(skb)->saddr,
ip_hdr(skb)->daddr, &rep.th);
}
+#endif
+#ifdef CONFIG_TCP_AO
+ if (sk && aoh && sk->sk_state != TCP_LISTEN) {
+ /* lookup key based on peer address and rcv_next*/
+ ao_key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
+
+ if (ao_key) {
+ struct tcp_ao_info *ao_info;
+ u8 keyid;
+
+ ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
+
+ /* XXX: optimize by using cached traffic key depending
+ * on socket state
+ */
+ if (tcp_v4_ao_calc_key_sk(ao_key, traffic_key, sk,
+ ao_info->lisn, ao_info->risn,
+ true))
+ goto out;
+
+ /* rcv_next holds the rcv_next of the peer, make keyid
+ * hold our rcv_next
+ */
+ keyid = ao_info->rnext_key->rcvid;
+ ao_sne = tcp_ao_compute_sne(ao_info->snd_sne,
+ ao_info->snd_sne_seq,
+ ntohl(rep.th.seq));
+
+ rep.opt[0] = htonl((TCPOPT_AO << 24) |
+ (tcp_ao_len(ao_key) << 16) |
+ (aoh->rnext_keyid << 8) | keyid);
+ arg.iov[0].iov_len += round_up(tcp_ao_len(ao_key), 4);
+ rep.th.doff = arg.iov[0].iov_len / 4;
+
+ if (tcp_ao_hash_hdr(AF_INET, (char *)&rep.opt[1],
+ ao_key, traffic_key,
+ (union tcp_ao_addr *)&ip_hdr(skb)->saddr,
+ (union tcp_ao_addr *)&ip_hdr(skb)->daddr,
+ &rep.th, ao_sne))
+ goto out;
+ }
+ }
#endif
/* Can't co-exist with TCPMD5, hence check rep.opt[0] */
if (rep.opt[0] == 0) {
@@ -860,7 +912,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
__TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
local_bh_enable();
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
out:
rcu_read_unlock();
#endif
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 58a77515aa27..23e0d4ffc007 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -865,7 +865,9 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
u32 ack, u32 win, u32 tsval, u32 tsecr,
int oif, struct tcp_md5sig_key *key, int rst,
- u8 tclass, __be32 label, u32 priority, u32 txhash)
+ u8 tclass, __be32 label, u32 priority, u32 txhash,
+ struct tcp_ao_key *ao_key, char *tkey,
+ u8 rcv_next, u32 ao_sne)
{
const struct tcphdr *th = tcp_hdr(skb);
struct tcphdr *t1;
@@ -884,6 +886,13 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
if (key)
tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
+#ifdef CONFIG_TCP_AO
+ if (ao_key)
+ tot_len += tcp_ao_len(ao_key);
+#endif
+#if defined(CONFIG_TCP_MD5SIG) && defined(CONFIG_TCP_AO)
+ WARN_ON_ONCE(key && ao_key);
+#endif
#ifdef CONFIG_MPTCP
if (rst && !key) {
@@ -935,6 +944,21 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
&ipv6_hdr(skb)->daddr, t1);
}
#endif
+#ifdef CONFIG_TCP_AO
+ if (ao_key) {
+ *topt++ = htonl((TCPOPT_AO << 24) | (tcp_ao_len(ao_key) << 16) |
+ (ao_key->sndid << 8) | (rcv_next));
+
+ /* TODO: this is right now not going to work for listening
+ * sockets since the socket won't have the needed ipv6
+ * addresses
+ */
+ tcp_ao_hash_hdr(AF_INET6, (char *)topt, ao_key, tkey,
+ (union tcp_ao_addr *)&ipv6_hdr(skb)->saddr,
+ (union tcp_ao_addr *)&ipv6_hdr(skb)->daddr,
+ t1, ao_sne);
+ }
+#endif
memset(&fl6, 0, sizeof(fl6));
fl6.daddr = ipv6_hdr(skb)->saddr;
@@ -999,17 +1023,28 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
u32 seq = 0, ack_seq = 0;
struct tcp_md5sig_key *key = NULL;
-#ifdef CONFIG_TCP_MD5SIG
- const __u8 *md5_hash_location = NULL;
- unsigned char newhash[16];
- int genhash;
- struct sock *sk1 = NULL;
-#endif
__be32 label = 0;
u32 priority = 0;
struct net *net;
+ struct tcp_ao_key *ao_key = NULL;
+ u8 rcv_next = 0;
+ u32 ao_sne = 0;
u32 txhash = 0;
int oif = 0;
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+ const __u8 *md5_hash_location = NULL;
+ const struct tcp_ao_hdr *aoh;
+#endif
+#ifdef CONFIG_TCP_MD5SIG
+ unsigned char newhash[16];
+ int genhash;
+ struct sock *sk1 = NULL;
+#endif
+#ifdef CONFIG_TCP_AO
+ char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+#else
+ u8 *traffic_key = NULL;
+#endif
if (th->rst)
return;
@@ -1021,12 +1056,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
return;
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
/* Invalid TCP option size or twice included auth */
- if (tcp_parse_auth_options(th, &md5_hash_location, NULL))
+ if (tcp_parse_auth_options(th, &md5_hash_location, &aoh))
return;
-
rcu_read_lock();
+#endif
+#ifdef CONFIG_TCP_MD5SIG
if (sk && sk_fullsock(sk)) {
int l3index;
@@ -1075,6 +1111,39 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
(th->doff << 2);
+#ifdef CONFIG_TCP_AO
+ /* XXX: Not implemented for listening sockets yet. How do we
+ * get the initial sequence numbers? Might need to pass in
+ * the request socket.
+ */
+ if (sk && aoh && sk->sk_state != TCP_LISTEN) {
+ struct tcp_ao_info *ao_info;
+
+ if (WARN_ON_ONCE(sk->sk_state == TCP_NEW_SYN_RECV))
+ goto out;
+
+ /* rcv_next is the peer's here */
+ ao_key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
+
+ if (ao_key) {
+ ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
+
+ /* XXX: optimize by using cached traffic key depending
+ * on socket state
+ */
+ if (tcp_v6_ao_calc_key_sk(ao_key, traffic_key, sk,
+ ao_info->lisn, ao_info->risn,
+ true))
+ goto out;
+
+ /* rcv_next switches to our rcv_next */
+ rcv_next = ao_info->rnext_key->rcvid;
+ ao_sne = tcp_ao_compute_sne(ao_info->snd_sne,
+ ao_info->snd_sne_seq, seq);
+ }
+ }
+#endif
+
if (sk) {
oif = sk->sk_bound_dev_if;
if (sk_fullsock(sk)) {
@@ -1097,9 +1166,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
}
tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1,
- ipv6_get_dsfield(ipv6h), label, priority, txhash);
+ ipv6_get_dsfield(ipv6h), label, priority, txhash,
+ ao_key, traffic_key, rcv_next, ao_sne);
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
out:
rcu_read_unlock();
#endif
@@ -1111,7 +1181,7 @@ static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
__be32 label, u32 priority, u32 txhash)
{
tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
- tclass, label, priority, txhash);
+ tclass, label, priority, txhash, NULL, NULL, 0, 0);
}
static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
--
2.38.1
Similarly to RST segments, wire SYN-ACKs to TCP-AO.
tcp_rsk_used_ao() is handy here to check if the request socket used AO
and needs a signature on the outgoing segments.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 4 ++++
include/net/tcp_ao.h | 6 ++++++
net/ipv4/tcp_ao.c | 14 ++++++++++++++
net/ipv4/tcp_ipv4.c | 1 +
net/ipv4/tcp_output.c | 37 +++++++++++++++++++++++++++++++------
net/ipv6/tcp_ao.c | 14 ++++++++++++++
net/ipv6/tcp_ipv6.c | 1 +
7 files changed, 71 insertions(+), 6 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index bda03d4925ed..5855ca6f1437 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2119,6 +2119,10 @@ struct tcp_request_sock_ops {
int sndid, int rcvid);
int (*ao_calc_key)(struct tcp_ao_key *mkt, u8 *key,
struct request_sock *sk);
+ int (*ao_synack_hash)(char *ao_hash, struct tcp_ao_key *mkt,
+ struct request_sock *req,
+ const struct sk_buff *skb,
+ int hash_offset, u32 sne);
#endif
#ifdef CONFIG_SYN_COOKIES
__u32 (*cookie_init_seq)(const struct sk_buff *skb,
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index e93db866bd44..731f0d6263db 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -139,6 +139,9 @@ int tcp_ao_hash_hdr(unsigned short family, char *ao_hash,
int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int sndid, int rcvid);
+int tcp_v4_ao_synack_hash(char *ao_hash, struct tcp_ao_key *mkt,
+ struct request_sock *req, const struct sk_buff *skb,
+ int hash_offset, u32 sne);
int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk,
__be32 sisn, __be32 disn, bool send);
@@ -173,6 +176,9 @@ int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const u8 *tkey, int hash_offset, u32 sne);
int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen);
+int tcp_v6_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key,
+ struct request_sock *req, const struct sk_buff *skb,
+ int hash_offset, u32 sne);
void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb);
void tcp_ao_connect_init(struct sock *sk);
void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index c9d3e29a28f1..e24a90505f08 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -604,6 +604,20 @@ int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
tkey, hash_offset, sne);
}
+int tcp_v4_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key,
+ struct request_sock *req, const struct sk_buff *skb,
+ int hash_offset, u32 sne)
+{
+ char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+
+ tcp_v4_ao_calc_key_rsk(ao_key, traffic_key, req);
+
+ tcp_ao_hash_skb(AF_INET, ao_hash, ao_key, req_to_sk(req), skb,
+ traffic_key, hash_offset, sne);
+
+ return 0;
+}
+
struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk,
struct request_sock *req,
int sndid, int rcvid)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 47325f148f29..37f344e2ae6b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1678,6 +1678,7 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
#ifdef CONFIG_TCP_AO
.ao_lookup = tcp_v4_ao_lookup_rsk,
.ao_calc_key = tcp_v4_ao_calc_key_rsk,
+ .ao_synack_hash = tcp_v4_ao_synack_hash,
#endif
#ifdef CONFIG_SYN_COOKIES
.cookie_init_seq = cookie_v4_init_sequence,
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 758c4a6e851b..3a121d9cd6dd 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3637,6 +3637,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
struct inet_request_sock *ireq = inet_rsk(req);
const struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *md5 = NULL;
+ struct tcp_ao_key *ao_key = NULL;
struct tcp_out_options opts;
struct sk_buff *skb;
int tcp_header_size;
@@ -3687,16 +3688,32 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
tcp_rsk(req)->snt_synack = tcp_skb_timestamp_us(skb);
}
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
rcu_read_lock();
- md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, req_to_sk(req));
#endif
+ if (tcp_rsk_used_ao(req)) {
+#ifdef CONFIG_TCP_AO
+ /* TODO: what should we do if the key is no longer available on
+ * the listening socket? Maybe we can try a different matching
+ * key (without sndid match). If that also fails what should
+ * we do? We currently send an unsigned synack. It's probably
+ * better to not send anything.
+ */
+ ao_key = tcp_sk(sk)->af_specific->ao_lookup(sk, req_to_sk(req),
+ tcp_rsk(req)->ao_keyid, -1);
+#endif
+ } else {
+#ifdef CONFIG_TCP_MD5SIG
+ md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk,
+ req_to_sk(req));
+#endif
+ }
skb_set_hash(skb, tcp_rsk(req)->txhash, PKT_HASH_TYPE_L4);
/* bpf program will be interested in the tcp_flags */
TCP_SKB_CB(skb)->tcp_flags = TCPHDR_SYN | TCPHDR_ACK;
tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, md5,
- NULL, foc, synack_type,
- syn_skb) + sizeof(*th);
+ ao_key, foc, synack_type, syn_skb)
+ + sizeof(*th);
skb_push(skb, tcp_header_size);
skb_reset_transport_header(skb);
@@ -3716,7 +3733,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
/* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */
th->window = htons(min(req->rsk_rcv_wnd, 65535U));
- tcp_options_write(th, NULL, NULL, &opts, NULL);
+ tcp_options_write(th, NULL, tcp_rsk(req), &opts, NULL);
th->doff = (tcp_header_size >> 2);
__TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS);
@@ -3724,7 +3741,15 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
/* Okay, we have all we need - do the md5 hash if needed */
if (md5)
tcp_rsk(req)->af_specific->calc_md5_hash(opts.hash_location,
- md5, req_to_sk(req), skb);
+ md5, req_to_sk(req), skb);
+#endif
+#ifdef CONFIG_TCP_AO
+ if (ao_key)
+ tcp_rsk(req)->af_specific->ao_synack_hash(opts.hash_location,
+ ao_key, req, skb,
+ opts.hash_location - (u8 *)th, 0);
+#endif
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
rcu_read_unlock();
#endif
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
index 31ae504af8e6..526bbe232a64 100644
--- a/net/ipv6/tcp_ao.c
+++ b/net/ipv6/tcp_ao.c
@@ -123,3 +123,17 @@ int tcp_v6_parse_ao(struct sock *sk, int cmd,
{
return tcp_parse_ao(sk, cmd, AF_INET6, optval, optlen);
}
+
+int tcp_v6_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key,
+ struct request_sock *req, const struct sk_buff *skb,
+ int hash_offset, u32 sne)
+{
+ char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+
+ tcp_v6_ao_calc_key_rsk(ao_key, traffic_key, req);
+
+ tcp_ao_hash_skb(AF_INET6, ao_hash, ao_key, req_to_sk(req), skb,
+ traffic_key, hash_offset, sne);
+
+ return 0;
+}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 88a8e6ce41dc..10ac715217cb 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -856,6 +856,7 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
#ifdef CONFIG_TCP_AO
.ao_lookup = tcp_v6_ao_lookup_rsk,
.ao_calc_key = tcp_v6_ao_calc_key_rsk,
+ .ao_synack_hash = tcp_v6_ao_synack_hash,
#endif
#ifdef CONFIG_SYN_COOKIES
.cookie_init_seq = cookie_v6_init_sequence,
--
2.38.1
Add support for sockets in time-wait state.
ao_info as well as all keys are inherited on transition to time-wait
socket. The lifetime of ao_info is now protected by ref counter, so
that tcp_ao_destroy_sock() will destruct it only when the last user is
gone.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/linux/tcp.h | 3 ++
include/net/tcp_ao.h | 11 +++++--
net/ipv4/tcp_ao.c | 47 ++++++++++++++++++++++----
net/ipv4/tcp_ipv4.c | 71 ++++++++++++++++++++++++++++++++++++----
net/ipv4/tcp_minisocks.c | 4 ++-
net/ipv6/tcp_ipv6.c | 45 ++++++++++++++++++++++---
6 files changed, 159 insertions(+), 22 deletions(-)
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index fd248875b0a9..6630a8195ea6 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -497,6 +497,9 @@ struct tcp_timewait_sock {
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *tw_md5_key;
#endif
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao_info;
+#endif
};
static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index d359fbf89da8..9804881fd2bf 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -85,6 +85,7 @@ struct tcp_ao_info {
u32 snd_sne_seq;
u32 rcv_sne;
u32 rcv_sne_seq;
+ atomic_t refcnt; /* Protects twsk destruction */
};
#ifdef CONFIG_TCP_AO
@@ -117,8 +118,9 @@ int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid);
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len);
-void tcp_ao_destroy_sock(struct sock *sk);
+void tcp_ao_destroy_sock(struct sock *sk, bool twsk);
u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq);
+void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key);
struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
@@ -169,7 +171,7 @@ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
return NULL;
}
-static inline void tcp_ao_destroy_sock(struct sock *sk)
+static inline void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
{
}
@@ -177,6 +179,11 @@ static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
{
}
+static inline void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw,
+ struct tcp_sock *tp)
+{
+}
+
static inline void tcp_ao_connect_init(struct sock *sk)
{
}
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index e20e3b435ce1..09d5cee7c6d7 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -75,8 +75,13 @@ struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid)
struct tcp_ao_key *key;
struct tcp_ao_info *ao;
- ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
- lockdep_sock_is_held(sk));
+ if (sk->sk_state == TCP_TIME_WAIT)
+ ao = rcu_dereference_check(tcp_twsk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ else
+ ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+
if (!ao)
return NULL;
@@ -177,6 +182,7 @@ static struct tcp_ao_info *tcp_ao_alloc_info(gfp_t flags,
if (!ao)
return NULL;
INIT_HLIST_HEAD(&ao->head);
+ atomic_set(&ao->refcnt, 1);
if (cloned_from)
ao->ao_flags = cloned_from->ao_flags;
@@ -196,27 +202,54 @@ static void tcp_ao_key_free_rcu(struct rcu_head *head)
kfree(key);
}
-void tcp_ao_destroy_sock(struct sock *sk)
+void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
{
struct tcp_ao_info *ao;
struct tcp_ao_key *key;
struct hlist_node *n;
- ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
- tcp_sk(sk)->ao_info = NULL;
+ if (twsk) {
+ ao = rcu_dereference_protected(tcp_twsk(sk)->ao_info, 1);
+ tcp_twsk(sk)->ao_info = NULL;
+ } else {
+ ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
+ tcp_sk(sk)->ao_info = NULL;
+ }
- if (!ao)
+ if (!ao || !atomic_dec_and_test(&ao->refcnt))
return;
hlist_for_each_entry_safe(key, n, &ao->head, node) {
hlist_del_rcu(&key->node);
- atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ if (!twsk)
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
call_rcu(&key->rcu, tcp_ao_key_free_rcu);
}
kfree_rcu(ao, rcu);
}
+void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp)
+{
+ struct tcp_ao_info *ao_info = rcu_dereference_protected(tp->ao_info, 1);
+
+ if (ao_info) {
+ struct tcp_ao_key *key;
+ struct hlist_node *n;
+ int omem = 0;
+
+ hlist_for_each_entry_safe(key, n, &ao_info->head, node) {
+ omem += tcp_ao_sizeof_key(key);
+ }
+
+ atomic_inc(&ao_info->refcnt);
+ atomic_sub(omem, &(((struct sock *)tp)->sk_omem_alloc));
+ rcu_assign_pointer(tcptw->ao_info, ao_info);
+ } else {
+ tcptw->ao_info = NULL;
+ }
+}
+
/* 4 tuple and ISNs are expected in NBO */
static int tcp_v4_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
__be32 saddr, __be32 daddr,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index b76933bb073e..fcf61b5bc581 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -823,7 +823,10 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
struct tcp_ao_info *ao_info;
u8 keyid;
- ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
+ if (sk->sk_state == TCP_TIME_WAIT)
+ ao_info = rcu_dereference(tcp_twsk(sk)->ao_info);
+ else
+ ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
/* XXX: optimize by using cached traffic key depending
* on socket state
@@ -926,16 +929,16 @@ static void tcp_v4_send_ack(const struct sock *sk,
struct sk_buff *skb, u32 seq, u32 ack,
u32 win, u32 tsval, u32 tsecr, int oif,
struct tcp_md5sig_key *key,
+ struct tcp_ao_key *ao_key,
+ u8 *traffic_key,
+ u8 rcv_next,
+ u32 ao_sne,
int reply_flags, u8 tos)
{
const struct tcphdr *th = tcp_hdr(skb);
struct {
struct tcphdr th;
- __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2)
-#ifdef CONFIG_TCP_MD5SIG
- + (TCPOLEN_MD5SIG_ALIGNED >> 2)
-#endif
- ];
+ __be32 opt[(MAX_TCP_OPTION_SPACE >> 2)];
} rep;
struct net *net = sock_net(sk);
struct ip_reply_arg arg;
@@ -981,6 +984,25 @@ static void tcp_v4_send_ack(const struct sock *sk,
ip_hdr(skb)->daddr, &rep.th);
}
#endif
+#ifdef CONFIG_TCP_AO
+ if (ao_key) {
+ int offset = (tsecr) ? 3 : 0;
+
+ rep.opt[offset++] = htonl((TCPOPT_AO << 24) |
+ (tcp_ao_len(ao_key) << 16) |
+ (ao_key->sndid << 8) | rcv_next);
+ arg.iov[0].iov_len += round_up(tcp_ao_len(ao_key), 4);
+ rep.th.doff = arg.iov[0].iov_len / 4;
+
+ tcp_ao_hash_hdr(AF_INET, (char *)&rep.opt[offset],
+ ao_key, traffic_key,
+ (union tcp_ao_addr *)&ip_hdr(skb)->saddr,
+ (union tcp_ao_addr *)&ip_hdr(skb)->daddr,
+ &rep.th, ao_sne);
+ }
+ WARN_ON_ONCE(key && ao_key);
+#endif
+ /* XXX: TCP-AO: hash ACK header */
arg.flags = reply_flags;
arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
ip_hdr(skb)->saddr, /* XXX */
@@ -1014,6 +1036,36 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
+ struct tcp_ao_key *ao_key = NULL;
+ u8 *traffic_key = NULL;
+ u8 rcv_next = 0;
+ u32 ao_sne = 0;
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao_info = NULL;
+ const struct tcp_ao_hdr *aoh;
+#endif
+
+#ifdef CONFIG_TCP_AO
+ if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+ goto out; /* something is wrong with the sign */
+
+ /* FIXME: we haven't verified the segment to-be-acked */
+ if (aoh)
+ ao_key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
+
+ if (ao_key) {
+ traffic_key = snd_other_key(ao_key);
+ ao_info = rcu_dereference(tcptw->ao_info);
+ /* It's possible we can get rid of computing the sne
+ * below since sne probably doesn't change once we are
+ * in timewait state.
+ */
+ ao_sne = tcp_ao_compute_sne(ao_info->snd_sne,
+ ao_info->snd_sne_seq,
+ tcptw->tw_snd_nxt);
+ rcv_next = ao_info->rnext_key->rcvid;
+ }
+#endif
tcp_v4_send_ack(sk, skb,
tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
@@ -1022,10 +1074,14 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
tcptw->tw_ts_recent,
tw->tw_bound_dev_if,
tcp_twsk_md5_key(tcptw),
+ ao_key, traffic_key, rcv_next, ao_sne,
tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0,
tw->tw_tos
);
+#ifdef CONFIG_TCP_AO
+out:
+#endif
inet_twsk_put(tw);
}
@@ -1055,6 +1111,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
req->ts_recent,
0,
tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
+ NULL, NULL, 0, 0,
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
ip_hdr(skb)->tos);
}
@@ -2400,7 +2457,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
rcu_assign_pointer(tp->md5sig_info, NULL);
}
#endif
- tcp_ao_destroy_sock(sk);
+ tcp_ao_destroy_sock(sk, false);
/* Clean up a referenced TCP bind bucket. */
if (inet_csk(sk)->icsk_bind_hash)
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index f7a75dce140b..87cf3073b6c2 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -246,7 +246,7 @@ EXPORT_SYMBOL(tcp_timewait_state_process);
void tcp_time_wait(struct sock *sk, int state, int timeo)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
- const struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
struct net *net = sock_net(sk);
struct inet_timewait_sock *tw;
@@ -305,6 +305,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
}
} while (0);
#endif
+ tcp_ao_time_wait(tcptw, tp);
/* Get the TIME_WAIT timeout firing. */
if (timeo < rto)
@@ -359,6 +360,7 @@ void tcp_twsk_destructor(struct sock *sk)
call_rcu(&twsk->tw_md5_key->rcu, tcp_md5_twsk_free_rcu);
}
#endif
+ tcp_ao_destroy_sock(sk, true);
}
EXPORT_SYMBOL_GPL(tcp_twsk_destructor);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 23e0d4ffc007..7bd4d0bb77cd 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1126,7 +1126,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
ao_key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
if (ao_key) {
- ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
+ if (sk->sk_state == TCP_TIME_WAIT)
+ ao_info = rcu_dereference(tcp_twsk(sk)->ao_info);
+ else
+ ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
/* XXX: optimize by using cached traffic key depending
* on socket state
@@ -1178,24 +1181,56 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
struct tcp_md5sig_key *key, u8 tclass,
- __be32 label, u32 priority, u32 txhash)
+ __be32 label, u32 priority, u32 txhash,
+ struct tcp_ao_key *ao_key, char *tkey,
+ u8 rcv_next, u32 ao_sne)
{
tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
- tclass, label, priority, txhash, NULL, NULL, 0, 0);
+ tclass, label, priority, txhash,
+ ao_key, tkey, rcv_next, ao_sne);
}
static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
+ struct tcp_ao_key *ao_key = NULL;
+ u8 *traffic_key = NULL;
+ u8 rcv_next = 0;
+ u32 ao_sne = 0;
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao_info;
+ const struct tcp_ao_hdr *aoh;
+
+ ao_info = rcu_dereference(tcptw->ao_info);
+ if (ao_info) {
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+ goto out;
+ /* FIXME: we haven't verified the segment to-be-acked */
+ if (aoh)
+ ao_key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
+ if (ao_key) {
+ traffic_key = snd_other_key(ao_key);
+ /* rcv_next switches to our rcv_next */
+ rcv_next = ao_info->rnext_key->rcvid;
+ ao_sne = tcp_ao_compute_sne(ao_info->snd_sne,
+ ao_info->snd_sne_seq,
+ tcptw->tw_snd_nxt);
+ }
+ }
+#endif
tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
tcp_time_stamp_raw() + tcptw->tw_ts_offset,
tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority,
- tw->tw_txhash);
+ tw->tw_txhash, ao_key, traffic_key, rcv_next, ao_sne);
+#ifdef CONFIG_TCP_AO
+out:
+#endif
inet_twsk_put(tw);
}
@@ -1222,7 +1257,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
req->ts_recent, sk->sk_bound_dev_if,
tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority,
- tcp_rsk(req)->txhash);
+ tcp_rsk(req)->txhash, NULL, NULL, 0, 0);
}
--
2.38.1
Now there is a common function to verify signature on TCP segments:
tcp_inbound_hash(). It has checks for all possible cross-interactions
with MD5 signs as well as with unsigned segments.
The rules from RFC5925 are:
(1) Any TCP segment can have at max only one signature.
(2) TCP connections can't switch between using TCP-MD5 and TCP-AO.
(3) TCP-AO connections can't stop using AO, as well as unsigned
connections can't suddenly start using AO.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/dropreason.h | 18 +++++
include/net/tcp.h | 59 +++++++++++++++-
include/net/tcp_ao.h | 22 ++++++
net/ipv4/tcp.c | 39 +++--------
net/ipv4/tcp_ao.c | 143 +++++++++++++++++++++++++++++++++++++++
net/ipv4/tcp_ipv4.c | 11 +--
net/ipv6/tcp_ao.c | 12 ++++
net/ipv6/tcp_ipv6.c | 11 +--
8 files changed, 272 insertions(+), 43 deletions(-)
diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index c1cbcdbaf149..1359b15a53f3 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -127,6 +127,11 @@ enum skb_drop_reason {
* drop out of udp_memory_allocated.
*/
SKB_DROP_REASON_PROTO_MEM,
+ /**
+ * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met
+ * twice or set incorrectly.
+ */
+ SKB_DROP_REASON_TCP_AUTH_HDR,
/**
* @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected,
* corresponding to LINUX_MIB_TCPMD5NOTFOUND
@@ -142,6 +147,19 @@ enum skb_drop_reason {
* to LINUX_MIB_TCPMD5FAILURE
*/
SKB_DROP_REASON_TCP_MD5FAILURE,
+ /**
+ * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected
+ */
+ SKB_DROP_REASON_TCP_AONOTFOUND,
+ /**
+ * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
+ * was not expected.
+ */
+ SKB_DROP_REASON_TCP_AOUNEXPECTED,
+ /** @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown */
+ SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
+ /** @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong */
+ SKB_DROP_REASON_TCP_AOFAILURE,
/**
* @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
* see LINUX_MIB_TCPBACKLOGDROP)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5855ca6f1437..454401452a93 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1703,7 +1703,7 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk,
enum skb_drop_reason
tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
const void *saddr, const void *daddr,
- int family, int dif, int sdif);
+ int family, int l3index, const __u8 *hash_location);
#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key)
@@ -1725,7 +1725,7 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk,
static inline enum skb_drop_reason
tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
const void *saddr, const void *daddr,
- int family, int dif, int sdif)
+ int family, int l3index, const __u8 *hash_location)
{
return SKB_NOT_DROPPED_YET;
}
@@ -2100,6 +2100,10 @@ struct tcp_sock_af_ops {
const struct sock *sk,
__be32 sisn, __be32 disn,
bool send);
+ int (*ao_calc_key_skb)(struct tcp_ao_key *mkt,
+ u8 *key,
+ const struct sk_buff *skb,
+ __be32 sisn, __be32 disn);
#endif
};
@@ -2510,4 +2514,55 @@ static inline int tcp_parse_auth_options(const struct tcphdr *th,
return 0;
}
+/* Called with rcu_read_lock() */
+static inline enum skb_drop_reason
+tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
+ const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+ const struct tcp_ao_hdr *aoh;
+ const __u8 *md5_location;
+ int l3index;
+
+ /* Invalid option or two times meet any of auth options */
+ if (tcp_parse_auth_options(th, &md5_location, &aoh))
+ return SKB_DROP_REASON_TCP_AUTH_HDR;
+
+ if (req) {
+ if (tcp_rsk_used_ao(req) != !!aoh)
+ return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
+
+ /* sdif set, means packet ingressed via a device
+ * in an L3 domain and dif is set to the l3mdev
+ */
+ l3index = sdif ? dif : 0;
+
+ /* Fast path: unsigned segments */
+ if (likely(!md5_location && !aoh)) {
+ /* Drop if there's TCP-MD5 or TCP-AO key with any rcvid/sndid
+ * for the remote peer. On TCP-AO established connection
+ * the last key is impossible to remove, so there's
+ * always at least one current_key.
+ */
+#ifdef CONFIG_TCP_AO
+ if (unlikely(tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0)))
+ return SKB_DROP_REASON_TCP_AONOTFOUND;
+#endif
+ if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
+ return SKB_DROP_REASON_TCP_MD5NOTFOUND;
+ }
+ return SKB_NOT_DROPPED_YET;
+ }
+
+ if (aoh)
+ return tcp_inbound_ao_hash(sk, skb, family, req, aoh);
+
+ return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family,
+ l3index, md5_location);
+}
+
#endif /* _TCP_H */
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 731f0d6263db..5eb4ae84b333 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -109,6 +109,9 @@ struct tcp6_ao_context {
__be32 disn;
};
+#define TCP_AO_ESTABLISHED (TCPF_ESTABLISHED|TCPF_FIN_WAIT1|TCPF_FIN_WAIT2|\
+ TCPF_CLOSE|TCPF_CLOSE_WAIT|TCPF_LAST_ACK|TCPF_CLOSING)
+
int tcp_ao_hash_skb(unsigned short int family,
char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
@@ -126,6 +129,10 @@ u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq);
void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key);
+enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk,
+ const struct sk_buff *skb, unsigned short int family,
+ const struct request_sock *req,
+ const struct tcp_ao_hdr *aoh);
struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port);
@@ -147,9 +154,14 @@ int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
__be32 sisn, __be32 disn, bool send);
int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
struct request_sock *req);
+int tcp_v4_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key,
+ const struct sk_buff *skb, __be32 sisn, __be32 disn);
struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk,
struct request_sock *req,
int sndid, int rcvid);
+bool tcp_v4_inbound_ao_hash(struct sock *sk,
+ struct request_sock *req,
+ const struct sk_buff *skb);
int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
@@ -157,6 +169,9 @@ int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
int tcp_v6_ao_hash_pseudoheader(struct crypto_pool_ahash *hp,
const struct in6_addr *daddr,
const struct in6_addr *saddr, int nbytes);
+int tcp_v6_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key,
+ const struct sk_buff *skb, __be32 sisn,
+ __be32 disn);
int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk, __be32 sisn,
__be32 disn, bool send);
@@ -192,6 +207,13 @@ static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
{
}
+static inline enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk,
+ const struct sk_buff *skb, unsigned short int family,
+ const struct request_sock *req, const struct tcp_ao_hdr *aoh)
+{
+ return SKB_NOT_DROPPED_YET;
+}
+
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 875149817036..7bfbb6330752 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4515,42 +4515,23 @@ EXPORT_SYMBOL(tcp_md5_hash_key);
enum skb_drop_reason
tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
const void *saddr, const void *daddr,
- int family, int dif, int sdif)
+ int family, int l3index, const __u8 *hash_location)
{
- /*
- * This gets called for each TCP segment that arrives
- * so we want to be efficient.
+ /* This gets called for each TCP segment that has TCP-MD5 option.
* We have 3 drop cases:
* o No MD5 hash and one expected.
* o MD5 hash and we're not expecting one.
* o MD5 hash and its wrong.
*/
- const __u8 *hash_location = NULL;
- struct tcp_md5sig_key *hash_expected;
const struct tcphdr *th = tcp_hdr(skb);
struct tcp_sock *tp = tcp_sk(sk);
- int genhash, l3index;
+ struct tcp_md5sig_key *key;
+ int genhash;
u8 newhash[16];
- /* sdif set, means packet ingressed via a device
- * in an L3 domain and dif is set to the l3mdev
- */
- l3index = sdif ? dif : 0;
-
- hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family);
- if (tcp_parse_auth_options(th, &hash_location, NULL))
- return true;
-
- /* We've parsed the options - do we have a hash? */
- if (!hash_expected && !hash_location)
- return SKB_NOT_DROPPED_YET;
-
- if (hash_expected && !hash_location) {
- NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
- return SKB_DROP_REASON_TCP_MD5NOTFOUND;
- }
+ key = tcp_md5_do_lookup(sk, l3index, saddr, family);
- if (!hash_expected && hash_location) {
+ if (!key && hash_location) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
return SKB_DROP_REASON_TCP_MD5UNEXPECTED;
}
@@ -4560,14 +4541,10 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
* IPv4-mapped case.
*/
if (family == AF_INET)
- genhash = tcp_v4_md5_hash_skb(newhash,
- hash_expected,
- NULL, skb);
+ genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb);
else
- genhash = tp->af_specific->calc_md5_hash(newhash,
- hash_expected,
+ genhash = tp->af_specific->calc_md5_hash(newhash, key,
NULL, skb);
-
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
if (family == AF_INET) {
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index e24a90505f08..93bba5e791dd 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -335,6 +335,17 @@ int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
htonl(tcp_rsk(req)->rcv_isn));
}
+int tcp_v4_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key,
+ const struct sk_buff *skb, __be32 sisn,
+ __be32 disn)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ return tcp_v4_ao_calc_key(mkt, key, iph->saddr, iph->daddr,
+ th->source, th->dest, sisn, disn);
+}
+
static int tcp_v4_ao_hash_pseudoheader(struct crypto_pool_ahash *hp,
__be32 daddr, __be32 saddr,
int nbytes)
@@ -681,6 +692,138 @@ void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
treq->maclen = tcp_ao_maclen(key);
}
+static enum skb_drop_reason
+tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
+ unsigned short int family, struct tcp_ao_info *info,
+ const struct tcp_ao_hdr *aoh, struct tcp_ao_key *key,
+ u8 *traffic_key, u8 *phash, u32 sne)
+{
+ unsigned char newhash[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+ u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr);
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ if (maclen != tcp_ao_maclen(key))
+ return SKB_DROP_REASON_TCP_AOFAILURE;
+
+ /* XXX: make it per-AF callback? */
+ tcp_ao_hash_skb(family, newhash, key, sk, skb, traffic_key,
+ (phash - (u8 *)th), sne);
+ if (memcmp(phash, newhash, maclen))
+ return SKB_DROP_REASON_TCP_AOFAILURE;
+ return SKB_NOT_DROPPED_YET;
+}
+
+enum skb_drop_reason
+tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
+ unsigned short int family, const struct request_sock *req,
+ const struct tcp_ao_hdr *aoh)
+{
+ const struct tcp_sock_af_ops *ops = tcp_sk(sk)->af_specific;
+ u8 key_buf[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+ const struct tcphdr *th = tcp_hdr(skb);
+ u8 *phash = (u8 *)(aoh + 1); /* hash goes just after the header */
+ struct tcp_ao_info *info;
+ struct tcp_ao_key *key;
+ __be32 sisn, disn;
+ u8 *traffic_key;
+ u32 sne = 0;
+
+ info = rcu_dereference(tcp_sk(sk)->ao_info);
+ if (!info)
+ return SKB_DROP_REASON_TCP_AOUNEXPECTED;
+
+ /* Fast-path */
+ /* TODO: fix fastopen and simultaneous open (TCPF_SYN_RECV) */
+ if (likely((1 << sk->sk_state) & (TCP_AO_ESTABLISHED | TCPF_SYN_RECV))) {
+ enum skb_drop_reason err;
+
+ /* Check if this socket's rnext_key matches the keyid in the
+ * packet. If not we lookup the key based on the keyid
+ * matching the rcvid in the mkt.
+ */
+ key = info->rnext_key;
+ if (key->rcvid != aoh->keyid) {
+ key = tcp_ao_do_lookup_rcvid(sk, aoh->keyid);
+ if (!key)
+ goto key_not_found;
+ }
+
+ if (unlikely(th->syn && !th->ack)) {
+ /* Delayed retransmitted syn */
+ sisn = th->seq;
+ disn = 0;
+ goto verify_hash;
+ }
+
+ sne = tcp_ao_compute_sne(info->rcv_sne, info->rcv_sne_seq,
+ ntohl(th->seq));
+ /* Established socket, traffic key are cached */
+ traffic_key = rcv_other_key(key);
+ err = tcp_ao_verify_hash(sk, skb, family, info, aoh, key,
+ traffic_key, phash, sne);
+ if (err)
+ return err;
+ /* Key rotation: the peer asks us to use new key (RNext) */
+ if (unlikely(aoh->rnext_keyid != info->current_key->sndid)) {
+ /* If the key is not found we do nothing. */
+ key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
+ if (key)
+ /* pairs with tcp_ao_del_cmd */
+ WRITE_ONCE(info->current_key, key);
+ }
+ return SKB_NOT_DROPPED_YET;
+ }
+
+ /* Lookup key based on peer address and keyid.
+ * current_key and rnext_key must not be used on tcp listen
+ * sockets as otherwise:
+ * - request sockets would race on those key pointers
+ * - tcp_ao_del_cmd() allows async key removal
+ */
+ key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid);
+ if (!key)
+ goto key_not_found;
+
+ if (th->syn && !th->ack) {
+ sisn = th->seq;
+ disn = 0;
+ goto verify_hash;
+ }
+
+ if (sk->sk_state == TCP_LISTEN) {
+ /* Make the initial syn the likely case here */
+ if (unlikely(req)) {
+ sne = tcp_ao_compute_sne(0, tcp_rsk(req)->rcv_isn,
+ ntohl(th->seq));
+ sisn = htonl(tcp_rsk(req)->rcv_isn);
+ disn = htonl(tcp_rsk(req)->snt_isn);
+ } else if (unlikely(th->ack && !th->syn)) {
+ /* Possible syncookie packet */
+ sisn = htonl(ntohl(th->seq) - 1);
+ disn = htonl(ntohl(th->ack_seq) - 1);
+ sne = tcp_ao_compute_sne(0, ntohl(sisn),
+ ntohl(th->seq));
+ }
+ } else if (sk->sk_state == TCP_SYN_SENT) {
+ disn = info->lisn;
+ if (th->syn)
+ sisn = th->seq;
+ else
+ sisn = info->risn;
+ } else {
+ WARN_ONCE(1, "TCP-AO: Unknown sk_state %d", sk->sk_state);
+ return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
+verify_hash:
+ traffic_key = key_buf;
+ ops->ao_calc_key_skb(key, traffic_key, skb, sisn, disn);
+ return tcp_ao_verify_hash(sk, skb, family, info, aoh, key,
+ traffic_key, phash, sne);
+
+key_not_found:
+ return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
+}
+
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key)
{
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 37f344e2ae6b..ea1e15b28f8d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2205,9 +2205,9 @@ int tcp_v4_rcv(struct sk_buff *skb)
if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
drop_reason = SKB_DROP_REASON_XFRM_POLICY;
else
- drop_reason = tcp_inbound_md5_hash(sk, skb,
- &iph->saddr, &iph->daddr,
- AF_INET, dif, sdif);
+ drop_reason = tcp_inbound_hash(sk, req, skb,
+ &iph->saddr, &iph->daddr,
+ AF_INET, dif, sdif);
if (unlikely(drop_reason)) {
sk_drops_add(sk, skb);
reqsk_put(req);
@@ -2283,8 +2283,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
goto discard_and_relse;
}
- drop_reason = tcp_inbound_md5_hash(sk, skb, &iph->saddr,
- &iph->daddr, AF_INET, dif, sdif);
+ drop_reason = tcp_inbound_hash(sk, NULL, skb, &iph->saddr, &iph->daddr,
+ AF_INET, dif, sdif);
if (drop_reason)
goto discard_and_relse;
@@ -2443,6 +2443,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
.calc_ao_hash = tcp_v4_ao_hash_skb,
.ao_parse = tcp_v4_parse_ao,
.ao_calc_key_sk = tcp_v4_ao_calc_key_sk,
+ .ao_calc_key_skb = tcp_v4_ao_calc_key_skb,
#endif
};
#endif
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
index 526bbe232a64..f23c817166bb 100644
--- a/net/ipv6/tcp_ao.c
+++ b/net/ipv6/tcp_ao.c
@@ -39,6 +39,18 @@ int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp));
}
+int tcp_v6_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key,
+ const struct sk_buff *skb,
+ __be32 sisn, __be32 disn)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ const struct tcphdr *th = tcp_hdr(skb);
+
+ return tcp_v6_ao_calc_key(mkt, key, &iph->saddr,
+ &iph->daddr, th->source,
+ th->dest, sisn, disn);
+}
+
int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk, __be32 sisn,
__be32 disn, bool send)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 10ac715217cb..574c379bbaae 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1825,9 +1825,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
struct sock *nsk;
sk = req->rsk_listener;
- drop_reason = tcp_inbound_md5_hash(sk, skb,
- &hdr->saddr, &hdr->daddr,
- AF_INET6, dif, sdif);
+ drop_reason = tcp_inbound_hash(sk, req, skb,
+ &hdr->saddr, &hdr->daddr,
+ AF_INET6, dif, sdif);
if (drop_reason) {
sk_drops_add(sk, skb);
reqsk_put(req);
@@ -1899,8 +1899,8 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
goto discard_and_relse;
}
- drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr,
- AF_INET6, dif, sdif);
+ drop_reason = tcp_inbound_hash(sk, NULL, skb, &hdr->saddr, &hdr->daddr,
+ AF_INET6, dif, sdif);
if (drop_reason)
goto discard_and_relse;
@@ -2093,6 +2093,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
.calc_ao_hash = tcp_v6_ao_hash_skb,
.ao_parse = tcp_v6_parse_ao,
.ao_calc_key_sk = tcp_v6_ao_calc_key_sk,
+ .ao_calc_key_skb = tcp_v6_ao_calc_key_skb,
#endif
};
#endif
--
2.38.1
Introduce a helper that:
(1) shares the common code with TCP-MD5 header options parsing
(2) looks for hash signature only once for both TCP-MD5 and TCP-AO
(3) fails with -EEXIST if any TCP sign option is present twice, see
RFC5925 (2.2):
">> A single TCP segment MUST NOT have more than one TCP-AO in its
options sequence. When multiple TCP-AOs appear, TCP MUST discard
the segment."
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 24 +++++++++++++++++++++++-
include/net/tcp_ao.h | 17 ++++++++++++++++-
net/ipv4/tcp.c | 3 ++-
net/ipv4/tcp_input.c | 39 +++++++++++++++++++++++++++++----------
net/ipv4/tcp_ipv4.c | 15 ++++++++++-----
net/ipv6/tcp_ipv6.c | 11 +++++++----
6 files changed, 87 insertions(+), 22 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index f3d1e7370461..d2395ae7484c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -435,7 +435,6 @@ int tcp_mmap(struct file *file, struct socket *sock,
void tcp_parse_options(const struct net *net, const struct sk_buff *skb,
struct tcp_options_received *opt_rx,
int estab, struct tcp_fastopen_cookie *foc);
-const u8 *tcp_parse_md5sig_option(const struct tcphdr *th);
/*
* BPF SKB-less helpers
@@ -2477,4 +2476,27 @@ static inline u64 tcp_transmit_time(const struct sock *sk)
return 0;
}
+static inline int tcp_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const struct tcp_ao_hdr **aoh)
+{
+ const u8 *md5_tmp, *ao_tmp;
+ int ret;
+
+ ret = tcp_do_parse_auth_options(th, &md5_tmp, &ao_tmp);
+ if (ret)
+ return ret;
+
+ if (md5_hash)
+ *md5_hash = md5_tmp;
+
+ if (aoh) {
+ if (!ao_tmp)
+ *aoh = NULL;
+ else
+ *aoh = (struct tcp_ao_hdr *)(ao_tmp - 2);
+ }
+
+ return 0;
+}
+
#endif /* _TCP_H */
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index f840b693d038..7b38ac70416f 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -150,7 +150,9 @@ int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen);
void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb);
void tcp_ao_connect_init(struct sock *sk);
-
+void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
+ struct tcp_request_sock *treq,
+ unsigned short int family);
#else /* CONFIG_TCP_AO */
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
@@ -173,4 +175,17 @@ static inline void tcp_ao_connect_init(struct sock *sk)
}
#endif
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash);
+#else
+static int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash)
+{
+ *md5_hash = NULL;
+ *ao_hash = NULL;
+ return 0;
+}
+#endif
+
#endif /* _TCP_AO_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 27662c9b0870..875149817036 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4538,7 +4538,8 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
l3index = sdif ? dif : 0;
hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family);
- hash_location = tcp_parse_md5sig_option(th);
+ if (tcp_parse_auth_options(th, &hash_location, NULL))
+ return true;
/* We've parsed the options - do we have a hash? */
if (!hash_expected && !hash_location)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0e753a2f84e4..a7c3823cd052 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4201,39 +4201,58 @@ static bool tcp_fast_parse_options(const struct net *net,
return true;
}
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
/*
- * Parse MD5 Signature option
+ * Parse Signature options
*/
-const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
+int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash)
{
int length = (th->doff << 2) - sizeof(*th);
const u8 *ptr = (const u8 *)(th + 1);
+ unsigned int minlen = TCPOLEN_MD5SIG;
+
+ if (IS_ENABLED(CONFIG_TCP_AO))
+ minlen = sizeof(struct tcp_ao_hdr) + 1;
+
+ *md5_hash = NULL;
+ *ao_hash = NULL;
/* If not enough data remaining, we can short cut */
- while (length >= TCPOLEN_MD5SIG) {
+ while (length >= minlen) {
int opcode = *ptr++;
int opsize;
switch (opcode) {
case TCPOPT_EOL:
- return NULL;
+ return 0;
case TCPOPT_NOP:
length--;
continue;
default:
opsize = *ptr++;
if (opsize < 2 || opsize > length)
- return NULL;
- if (opcode == TCPOPT_MD5SIG)
- return opsize == TCPOLEN_MD5SIG ? ptr : NULL;
+ return -EINVAL;
+ if (opcode == TCPOPT_MD5SIG) {
+ if (opsize != TCPOLEN_MD5SIG)
+ return -EINVAL;
+ if (unlikely(*md5_hash || *ao_hash))
+ return -EEXIST;
+ *md5_hash = ptr;
+ } else if (opcode == TCPOPT_AO) {
+ if (opsize <= sizeof(struct tcp_ao_hdr))
+ return -EINVAL;
+ if (unlikely(*md5_hash || *ao_hash))
+ return -EEXIST;
+ *ao_hash = ptr;
+ }
}
ptr += opsize - 2;
length -= opsize;
}
- return NULL;
+ return 0;
}
-EXPORT_SYMBOL(tcp_parse_md5sig_option);
+EXPORT_SYMBOL(tcp_do_parse_auth_options);
#endif
/* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ee9efaa9d8d5..1c014b326ee6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -680,7 +680,9 @@ EXPORT_SYMBOL(tcp_v4_send_check);
* Exception: precedence violation. We do not implement it in any case.
*/
-#ifdef CONFIG_TCP_MD5SIG
+#ifdef CONFIG_TCP_AO
+#define OPTION_BYTES MAX_TCP_OPTION_SPACE
+#elif defined(CONFIG_TCP_MD5SIG)
#define OPTION_BYTES TCPOLEN_MD5SIG_ALIGNED
#else
#define OPTION_BYTES sizeof(__be32)
@@ -696,7 +698,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
struct ip_reply_arg arg;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key = NULL;
- const __u8 *hash_location = NULL;
+ const __u8 *md5_hash_location = NULL;
unsigned char newhash[16];
int genhash;
struct sock *sk1 = NULL;
@@ -736,8 +738,11 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
#ifdef CONFIG_TCP_MD5SIG
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, NULL))
+ return;
+
rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
const union tcp_md5_addr *addr;
int l3index;
@@ -748,7 +753,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
- } else if (hash_location) {
+ } else if (md5_hash_location) {
const union tcp_md5_addr *addr;
int sdif = tcp_v4_sdif(skb);
int dif = inet_iif(skb);
@@ -780,7 +785,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
+ if (genhash || memcmp(md5_hash_location, newhash, 16) != 0)
goto out;
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index bb2b21965911..58a77515aa27 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1000,7 +1000,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
u32 seq = 0, ack_seq = 0;
struct tcp_md5sig_key *key = NULL;
#ifdef CONFIG_TCP_MD5SIG
- const __u8 *hash_location = NULL;
+ const __u8 *md5_hash_location = NULL;
unsigned char newhash[16];
int genhash;
struct sock *sk1 = NULL;
@@ -1022,8 +1022,11 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
#ifdef CONFIG_TCP_MD5SIG
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(th, &md5_hash_location, NULL))
+ return;
+
rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
int l3index;
@@ -1032,7 +1035,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
*/
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
- } else if (hash_location) {
+ } else if (md5_hash_location) {
int dif = tcp_v6_iif_l3_slave(skb);
int sdif = tcp_v6_sdif(skb);
int l3index;
@@ -1061,7 +1064,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
goto out;
genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
+ if (genhash || memcmp(md5_hash_location, newhash, 16) != 0)
goto out;
}
#endif
--
2.38.1
Similarly to IPsec, RFC5925 prescribes:
">> A TCP-AO implementation MUST default to ignore incoming ICMPv4
messages of Type 3 (destination unreachable), Codes 2-4 (protocol
unreachable, port unreachable, and fragmentation needed -- ’hard
errors’), and ICMPv6 Type 1 (destination unreachable), Code 1
(administratively prohibited) and Code 4 (port unreachable) intended
for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN-
WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs."
A selftest (later in patch series) verifies that this attack is not
possible in this TCP-AO implementation.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp_ao.h | 10 ++++++
include/uapi/linux/snmp.h | 1 +
include/uapi/linux/tcp.h | 1 +
net/ipv4/proc.c | 1 +
net/ipv4/tcp_ao.c | 70 ++++++++++++++++++++++++++++++++++++++-
net/ipv4/tcp_ipv4.c | 5 +++
net/ipv6/tcp_ipv6.c | 4 +++
7 files changed, 91 insertions(+), 1 deletion(-)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index b5ebc133399e..6e87d36fc1c3 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -25,6 +25,7 @@ struct tcp_ao_counters {
atomic64_t pkt_bad;
atomic64_t key_not_found;
atomic64_t ao_required;
+ atomic64_t dropped_icmp;
};
struct tcp_ao_key {
@@ -77,6 +78,9 @@ static inline unsigned int tcp_ao_digest_size(struct tcp_ao_key *key)
return key->digest_size;
}
+/* bits in 'ao_flags' */
+#define AO_ACCEPT_ICMPS BIT(0)
+
struct tcp_ao_info {
struct hlist_head head;
struct rcu_head rcu;
@@ -166,6 +170,7 @@ u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq);
void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key);
+bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code);
enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk,
const struct sk_buff *skb, unsigned short int family,
const struct request_sock *req,
@@ -244,6 +249,11 @@ static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
{
}
+static inline bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code)
+{
+ return false;
+}
+
static inline enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk,
const struct sk_buff *skb, unsigned short int family,
const struct request_sock *req, const struct tcp_ao_hdr *aoh)
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index f09119db8b40..bc7655394e9a 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -296,6 +296,7 @@ enum
LINUX_MIB_TCPAOBAD, /* TCPAOBad */
LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */
LINUX_MIB_TCPAOGOOD, /* TCPAOGood */
+ LINUX_MIB_TCPAODROPPEDICMPS, /* TCPAODroppedIcmps */
__LINUX_MIB_MAX
};
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 5369458ae89f..508bedbc6ad8 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -349,6 +349,7 @@ struct tcp_diag_md5sig {
#define TCP_AO_CMDF_CURR (1 << 0) /* Only checks field sndid */
#define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */
+#define TCP_AO_CMDF_ACCEPT_ICMP (1 << 2) /* Accept incoming ICMPs */
struct tcp_ao { /* setsockopt(TCP_AO) */
struct __kernel_sockaddr_storage tcpa_addr;
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 689957a81553..82ff83a9afaa 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -301,6 +301,7 @@ static const struct snmp_mib snmp4_net_list[] = {
SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD),
SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND),
SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD),
+ SNMP_MIB_ITEM("TCPAODroppedIcmps", LINUX_MIB_TCPAODROPPEDICMPS),
SNMP_MIB_SENTINEL
};
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 307b279d55f5..e5b4e9f1e83e 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -15,6 +15,7 @@
#include <net/tcp.h>
#include <net/ipv6.h>
+#include <net/icmp.h>
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len)
@@ -52,6 +53,63 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
return 1;
}
+bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code)
+{
+ struct tcp_ao_info *ao;
+ bool ignore_icmp = false;
+
+ /* RFC5925, 7.8:
+ * >> A TCP-AO implementation MUST default to ignore incoming ICMPv4
+ * messages of Type 3 (destination unreachable), Codes 2-4 (protocol
+ * unreachable, port unreachable, and fragmentation needed -- ’hard
+ * errors’), and ICMPv6 Type 1 (destination unreachable), Code 1
+ * (administratively prohibited) and Code 4 (port unreachable) intended
+ * for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN-
+ * WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs.
+ */
+ if (sk->sk_family == AF_INET) {
+ if (type != ICMP_DEST_UNREACH)
+ return false;
+ if (code < ICMP_PROT_UNREACH || code > ICMP_FRAG_NEEDED)
+ return false;
+ } else if (sk->sk_family == AF_INET6) {
+ if (type != ICMPV6_DEST_UNREACH)
+ return false;
+ if (code != ICMPV6_ADM_PROHIBITED && code != ICMPV6_PORT_UNREACH)
+ return false;
+ } else {
+ WARN_ON_ONCE(1);
+ return false;
+ }
+
+ rcu_read_lock();
+ switch (sk->sk_state) {
+ case TCP_TIME_WAIT:
+ ao = rcu_dereference(tcp_twsk(sk)->ao_info);
+ break;
+ case TCP_SYN_SENT:
+ case TCP_SYN_RECV:
+ case TCP_LISTEN:
+ case TCP_NEW_SYN_RECV:
+ /* RFC5925 specifies to ignore ICMPs *only* on connections
+ * in synchronized states.
+ */
+ rcu_read_unlock();
+ return false;
+ default:
+ ao = rcu_dereference(tcp_sk(sk)->ao_info);
+ }
+
+ if (ao && !(ao->ao_flags & AO_ACCEPT_ICMPS)) {
+ ignore_icmp = true;
+ __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAODROPPEDICMPS);
+ atomic64_inc(&ao->counters.dropped_icmp);
+ }
+ rcu_read_unlock();
+
+ return ignore_icmp;
+}
+
static struct tcp_ao_key *tcp_ao_do_lookup_keyid(struct tcp_ao_info *ao,
int sndid, int rcvid)
{
@@ -1441,7 +1499,7 @@ static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
#define TCP_AO_KEYF_ALL (0)
#define TCP_AO_CMDF_ADDMOD_VALID \
- (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
+ (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_ACCEPT_ICMP)
#define TCP_AO_CMDF_DEL_VALID \
(TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
@@ -1524,6 +1582,11 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
atomic64_set(&key->pkt_good, 0);
atomic64_set(&key->pkt_bad, 0);
+ if (cmd.tcpa_flags & TCP_AO_CMDF_ACCEPT_ICMP)
+ ao_info->ao_flags |= AO_ACCEPT_ICMPS;
+ else
+ ao_info->ao_flags &= ~AO_ACCEPT_ICMPS;
+
ret = tcp_ao_parse_crypto(&cmd, key);
if (ret < 0)
goto err_free_sock;
@@ -1683,6 +1746,11 @@ static int tcp_ao_mod_cmd(struct sock *sk, unsigned short int family,
if (!ao_info)
return -ENOENT;
/* TODO: make tcp_ao_current_rnext() and flags set atomic */
+ if (cmd.tcpa_flags & TCP_AO_CMDF_ACCEPT_ICMP)
+ ao_info->ao_flags |= AO_ACCEPT_ICMPS;
+ else
+ ao_info->ao_flags &= ~AO_ACCEPT_ICMPS;
+
return tcp_ao_current_rnext(sk, cmd.tcpa_flags,
cmd.tcpa_current, cmd.tcpa_rnext);
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ea1e15b28f8d..782cc790c6fa 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -504,6 +504,8 @@ int tcp_v4_err(struct sk_buff *skb, u32 info)
return -ENOENT;
}
if (sk->sk_state == TCP_TIME_WAIT) {
+ /* To increase the counter of ignored icmps for TCP-AO */
+ tcp_ao_ignore_icmp(sk, type, code);
inet_twsk_put(inet_twsk(sk));
return 0;
}
@@ -518,6 +520,9 @@ int tcp_v4_err(struct sk_buff *skb, u32 info)
}
bh_lock_sock(sk);
+ if (tcp_ao_ignore_icmp(sk, type, code))
+ goto out;
+
/* If too many ICMPs get dropped on busy
* servers this needs to be solved differently.
* We do take care of PMTU discovery (RFC1191) special case :
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 574c379bbaae..2a0477899c50 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -411,6 +411,8 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
}
if (sk->sk_state == TCP_TIME_WAIT) {
+ /* To increase the counter of ignored icmps for TCP-AO */
+ tcp_ao_ignore_icmp(sk, type, code);
inet_twsk_put(inet_twsk(sk));
return 0;
}
@@ -422,6 +424,8 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
}
bh_lock_sock(sk);
+ if (tcp_ao_ignore_icmp(sk, type, code))
+ goto out;
if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
__NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
--
2.38.1
Introduce getsockopt() that let user get TCP-AO keys and their
properties from a socket. A user can provide a filter to match
a specific key to be dumped or TCP_AO_GET_ALL flag may be used to dump
all keys in one syscall.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp_ao.h | 1 +
include/uapi/linux/tcp.h | 19 ++++
net/ipv4/tcp.c | 11 ++
net/ipv4/tcp_ao.c | 225 +++++++++++++++++++++++++++++++++++++++
4 files changed, 256 insertions(+)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 6e87d36fc1c3..67f5273396ec 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -171,6 +171,7 @@ void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key);
bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code);
+int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen);
enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk,
const struct sk_buff *skb, unsigned short int family,
const struct request_sock *req,
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index b60933ee2a27..453187d21da8 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -132,6 +132,7 @@ enum {
#define TCP_AO 38 /* (Add/Set MKT) */
#define TCP_AO_DEL 39 /* (Delete MKT) */
#define TCP_AO_MOD 40 /* (Modify MKT) */
+#define TCP_AO_GET 41 /* (Get MKTs) */
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF 0
@@ -353,6 +354,10 @@ struct tcp_diag_md5sig {
#define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */
#define TCP_AO_CMDF_ACCEPT_ICMP (1 << 2) /* Accept incoming ICMPs */
+#define TCP_AO_GET_CURR TCP_AO_CMDF_CURR
+#define TCP_AO_GET_NEXT TCP_AO_CMDF_NEXT
+#define TCP_AO_GET_ALL (1 << 2)
+
struct tcp_ao { /* setsockopt(TCP_AO) */
struct __kernel_sockaddr_storage tcpa_addr;
char tcpa_alg_name[64];
@@ -382,6 +387,20 @@ struct tcp_ao_mod { /* setsockopt(TCP_AO_MOD) */
__u8 tcpa_rnext;
} __attribute__((aligned(8)));
+struct tcp_ao_getsockopt { /* getsockopt(TCP_AO_GET) */
+ struct __kernel_sockaddr_storage addr;
+ __u8 sndid;
+ __u8 rcvid;
+ __u32 nkeys;
+ char alg_name[64];
+ __u16 flags;
+ __u8 prefix;
+ __u8 maclen;
+ __u8 keyflags;
+ __u8 keylen;
+ __u8 key[TCP_AO_MAXKEYLEN];
+} __attribute__((aligned(8)));
+
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 8d64bdec3af8..b8c7104cf0c0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4386,6 +4386,17 @@ int do_tcp_getsockopt(struct sock *sk, int level,
err = -EFAULT;
return err;
}
+#endif
+#ifdef CONFIG_TCP_AO
+ case TCP_AO_GET: {
+ int err;
+
+ sockopt_lock_sock(sk);
+ err = tcp_ao_get_mkts(sk, optval, optlen);
+ sockopt_release_sock(sk);
+
+ return err;
+ }
#endif
default:
return -ENOPROTOOPT;
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 90b864d4ee7d..a29c5bb8586b 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -1504,6 +1504,8 @@ static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
(TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_ACCEPT_ICMP)
#define TCP_AO_CMDF_DEL_VALID \
(TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
+#define TCP_AO_GETF_VALID \
+ (TCP_AO_GET_ALL | TCP_AO_GET_CURR | TCP_AO_GET_NEXT)
static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
sockptr_t optval, int optlen)
@@ -1781,3 +1783,226 @@ int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen)
return tcp_parse_ao(sk, cmd, AF_INET, optval, optlen);
}
+/* tcp_ao_copy_mkts_to_user(ao_info, optval, optlen)
+ *
+ * @ao_info: struct tcp_ao_info on the socket that
+ * socket getsockopt(TCP_AO_GET) is executed on
+ * @optval: pointer to array of tcp_ao_getsockopt structures in user space.
+ * Must be != NULL.
+ * @optlen: pointer to size of tcp_ao_getsockopt structure.
+ * Must be != NULL.
+ *
+ * Return value: 0 on success, a negative error number otherwise.
+ *
+ * optval points to an array of tcp_ao_getsockopt structures in user space.
+ * optval[0] is used as both input and output to getsockopt. It determines
+ * which keys are returned by the kernel.
+ * optval[0].nkeys is the size of the array in user space. On return it contains
+ * the number of keys matching the search criteria.
+ * If TCP_AO_GET_ALL is set in "flags", then all keys in the socket are
+ * returned, otherwise only keys matching <addr, prefix, sndid, rcvid>
+ * in optval[0] are returned.
+ * optlen is also used as both input and output. The user provides the size
+ * of struct tcp_ao_getsockopt in user space, and the kernel returns the size
+ * of the structure in kernel space.
+ * The size of struct tcp_ao_getsockopt may differ between user and kernel.
+ * There are three cases to consider:
+ * * If usize == ksize, then keys are copied verbatim.
+ * * If usize < ksize, then the userspace has passed an old struct to a
+ * newer kernel. The rest of the trailing bytes in optval[0]
+ * (ksize - usize) are interpreted as 0 by the kernel.
+ * * If usize > ksize, then the userspace has passed a new struct to an
+ * older kernel. The trailing bytes unknown to the kernel (usize - ksize)
+ * are checked to ensure they are zeroed, otherwise -E2BIG is returned.
+ * On return the kernel fills in min(usize, ksize) in each entry of the array.
+ * The layout of the fields in the user and kernel structures is expected to
+ * be the same (including in the 32bit vs 64bit case).
+ */
+static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info,
+ sockptr_t optval, sockptr_t optlen)
+{
+ struct tcp_ao_getsockopt opt_in;
+ struct tcp_ao_getsockopt opt_out;
+ int user_len;
+ unsigned int max_keys; /* maximum number of keys to copy to user */
+ u32 copied_keys; /* keys copied to user so far */
+ int matched_keys; /* keys from ao_info matched so far */
+ int bytes_to_write; /* number of bytes to write to user level */
+ struct tcp_ao_key *key;
+ struct sockaddr_in *sin; /* (struct sockaddr_in *)&opt_in.addr */
+ struct sockaddr_in6 *sin6; /* (struct sockaddr_in6 *)&opt_in.addr */
+ struct in6_addr *addr6; /* &sin6->sin6_addr */
+ __kernel_sa_family_t ss_family;
+ union tcp_ao_addr *addr;
+ size_t out_offset = 0;
+ int optlen_out;
+ u8 prefix_in;
+ u16 port = 0;
+ bool copy_all, copy_current, copy_next;
+ int err;
+
+ if (copy_from_sockptr(&user_len, optlen, sizeof(int)))
+ return -EFAULT;
+
+ if (user_len <= 0)
+ return -EINVAL;
+
+ memset(&opt_in, 0, sizeof(struct tcp_ao_getsockopt));
+ err = copy_struct_from_sockptr(&opt_in, sizeof(opt_in),
+ optval, user_len);
+ if (err < 0)
+ return err;
+
+ ss_family = opt_in.addr.ss_family;
+
+ BUILD_BUG_ON(TCP_AO_GET_ALL & (TCP_AO_GET_CURR | TCP_AO_GET_NEXT));
+ if (opt_in.flags & ~TCP_AO_GETF_VALID)
+ return -EINVAL;
+
+ max_keys = opt_in.nkeys;
+ copy_all = !!(opt_in.flags & TCP_AO_GET_ALL);
+ copy_current = !!(opt_in.flags & TCP_AO_GET_CURR);
+ copy_next = !!(opt_in.flags & TCP_AO_GET_NEXT);
+
+ if (!(copy_all || copy_current || copy_next)) {
+ prefix_in = opt_in.prefix;
+
+ switch (ss_family) {
+ case AF_INET: {
+ sin = (struct sockaddr_in *)&opt_in.addr;
+ port = sin->sin_port;
+ addr = (union tcp_ao_addr *)&sin->sin_addr;
+
+ if (prefix_in > 32)
+ return -EINVAL;
+
+ if (sin->sin_addr.s_addr == INADDR_ANY &&
+ prefix_in != 0)
+ return -EINVAL;
+
+ break;
+ }
+ case AF_INET6: {
+ sin6 = (struct sockaddr_in6 *)&opt_in.addr;
+ addr = (union tcp_ao_addr *)&sin6->sin6_addr;
+ addr6 = &sin6->sin6_addr;
+ port = sin6->sin6_port;
+
+ if (prefix_in != 0) {
+ if (ipv6_addr_v4mapped(addr6)) {
+ __be32 addr4 = addr6->s6_addr32[3];
+
+ if (prefix_in > 32 ||
+ addr4 == INADDR_ANY)
+ return -EINVAL;
+ } else {
+ if (ipv6_addr_any(addr6) ||
+ prefix_in > 128)
+ return -EINVAL;
+ }
+ } else if (!ipv6_addr_any(addr6)) {
+ return -EINVAL;
+ }
+
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+
+ bytes_to_write = min(user_len, (int)sizeof(struct tcp_ao_getsockopt));
+ copied_keys = 0;
+ matched_keys = 0;
+
+ hlist_for_each_entry_rcu(key, &ao_info->head, node) {
+ if (copy_all)
+ goto match;
+
+ if (copy_current || copy_next) {
+ if (copy_current && key == ao_info->current_key)
+ goto match;
+ if (copy_next && key == ao_info->rnext_key)
+ goto match;
+ continue;
+ }
+
+ if (tcp_ao_key_cmp(key, addr, opt_in.prefix,
+ opt_in.addr.ss_family,
+ opt_in.sndid, opt_in.rcvid, port) != 0)
+ continue;
+match:
+ matched_keys++;
+ if (copied_keys >= max_keys)
+ continue;
+
+ memset(&opt_out, 0, sizeof(struct tcp_ao_getsockopt));
+
+ if (key->family == AF_INET) {
+ struct sockaddr_in *sin_out = (struct sockaddr_in *)&opt_out.addr;
+
+ sin_out->sin_family = key->family;
+ sin_out->sin_port = ntohs(key->port);
+ memcpy(&sin_out->sin_addr, &key->addr, sizeof(struct in_addr));
+ } else {
+ struct sockaddr_in6 *sin6_out = (struct sockaddr_in6 *)&opt_out.addr;
+
+ sin6_out->sin6_family = key->family;
+ sin6_out->sin6_port = ntohs(key->port);
+ memcpy(&sin6_out->sin6_addr, &key->addr, sizeof(struct in6_addr));
+ }
+ opt_out.sndid = key->sndid;
+ opt_out.rcvid = key->rcvid;
+ opt_out.prefix = key->prefixlen;
+ opt_out.keyflags = key->keyflags;
+ opt_out.flags = 0;
+ if (key == ao_info->current_key)
+ opt_out.flags |= TCP_AO_GET_CURR;
+ if (key == ao_info->rnext_key)
+ opt_out.flags |= TCP_AO_GET_NEXT;
+ opt_out.nkeys = 0;
+ opt_out.maclen = key->maclen;
+ opt_out.keylen = key->keylen;
+ memcpy(&opt_out.key, key->key, key->keylen);
+ crypto_pool_algo(key->crypto_pool_id, opt_out.alg_name, 64);
+
+ /* Copy key to user */
+ if (copy_to_sockptr_offset(optval, out_offset,
+ &opt_out, bytes_to_write))
+ return -EFAULT;
+ out_offset += user_len;
+ copied_keys++;
+ }
+
+ optlen_out = (int)sizeof(struct tcp_ao_getsockopt);
+ if (copy_to_sockptr(optlen, &optlen_out, sizeof(int)))
+ return -EFAULT;
+
+ out_offset = offsetof(struct tcp_ao_getsockopt, nkeys);
+ if (copy_to_sockptr_offset(optval, out_offset,
+ &matched_keys, sizeof(u32)))
+ return -EFAULT;
+
+ return 0;
+}
+
+int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen)
+{
+ struct tcp_ao_info *ao_info;
+ u32 state;
+
+ /* Check socket state */
+ state = (1 << sk->sk_state) &
+ (TCPF_CLOSE | TCPF_ESTABLISHED | TCPF_LISTEN);
+ if (!state)
+ return -ESOCKTNOSUPPORT;
+
+ /* Check ao_info */
+ ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ if (!ao_info)
+ return -ENOENT;
+
+ return tcp_ao_copy_mkts_to_user(ao_info, optval, optlen);
+}
+
--
2.38.1
Reverse to icmps-discard test: the server accepts ICMPs, using
TCP_AO_CMDF_ACCEPT_ICMP and it is expected to fail under ICMP
flood from client. Test that the default pre-TCP-AO behaviour functions
when TCP_AO_CMDF_ACCEPT_ICMP is set.
Expected output for ipv4 version (in case it receives ICMP_PROT_UNREACH):
> # ./icmps-accept_ipv4
> 1..3
> # 3209[lib/setup.c:166] rand seed 1642623870
> TAP version 13
> # 3209[lib/proc.c:207] Snmp6 Ip6InReceives: 0 => 1
> # 3209[lib/proc.c:207] Snmp6 Ip6InNoRoutes: 0 => 1
> # 3209[lib/proc.c:207] Snmp6 Ip6InOctets: 0 => 76
> # 3209[lib/proc.c:207] Snmp6 Ip6InNoECTPkts: 0 => 1
> # 3209[lib/proc.c:207] Tcp InSegs: 3 => 23
> # 3209[lib/proc.c:207] Tcp OutSegs: 2 => 22
> # 3209[lib/proc.c:207] IcmpMsg InType3: 0 => 4
> # 3209[lib/proc.c:207] Icmp InMsgs: 0 => 4
> # 3209[lib/proc.c:207] Icmp InDestUnreachs: 0 => 4
> # 3209[lib/proc.c:207] Ip InReceives: 3 => 27
> # 3209[lib/proc.c:207] Ip InDelivers: 3 => 27
> # 3209[lib/proc.c:207] Ip OutRequests: 2 => 22
> # 3209[lib/proc.c:207] IpExt InOctets: 288 => 3420
> # 3209[lib/proc.c:207] IpExt OutOctets: 124 => 3244
> # 3209[lib/proc.c:207] IpExt InNoECTPkts: 3 => 25
> # 3209[lib/proc.c:207] TcpExt TCPPureAcks: 1 => 2
> # 3209[lib/proc.c:207] TcpExt TCPOrigDataSent: 0 => 20
> # 3209[lib/proc.c:207] TcpExt TCPDelivered: 0 => 19
> # 3209[lib/proc.c:207] TcpExt TCPAOGood: 3 => 23
> ok 1 InDestUnreachs delivered 4
> ok 2 server failed with -92: Protocol not available
> ok 3 TCPAODroppedIcmps counter didn't change: 0 >= 0
> # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
Expected output for ipv6 version (in case it receives ADM_PROHIBITED):
> # ./icmps-accept_ipv6
> 1..3
> # 3277[lib/setup.c:166] rand seed 1642624035
> TAP version 13
> # 3277[lib/proc.c:207] Snmp6 Ip6InReceives: 6 => 31
> # 3277[lib/proc.c:207] Snmp6 Ip6InDelivers: 4 => 29
> # 3277[lib/proc.c:207] Snmp6 Ip6OutRequests: 4 => 24
> # 3277[lib/proc.c:207] Snmp6 Ip6InOctets: 592 => 4492
> # 3277[lib/proc.c:207] Snmp6 Ip6OutOctets: 332 => 3852
> # 3277[lib/proc.c:207] Snmp6 Ip6InNoECTPkts: 6 => 31
> # 3277[lib/proc.c:207] Snmp6 Icmp6InMsgs: 1 => 6
> # 3277[lib/proc.c:207] Snmp6 Icmp6InDestUnreachs: 0 => 5
> # 3277[lib/proc.c:207] Snmp6 Icmp6InType1: 0 => 5
> # 3277[lib/proc.c:207] Tcp InSegs: 3 => 23
> # 3277[lib/proc.c:207] Tcp OutSegs: 2 => 22
> # 3277[lib/proc.c:207] TcpExt TCPPureAcks: 1 => 2
> # 3277[lib/proc.c:207] TcpExt TCPOrigDataSent: 0 => 20
> # 3277[lib/proc.c:207] TcpExt TCPDelivered: 0 => 19
> # 3277[lib/proc.c:207] TcpExt TCPAOGood: 3 => 23
> ok 1 Icmp6InDestUnreachs delivered 5
> ok 2 server failed with -13: Permission denied
> ok 3 TCPAODroppedIcmps counter didn't change: 0 >= 0
> # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
With some luck the server may fail with ECONNREFUSED (depending on what
icmp packet was delivered firstly).
For the kernel error handlers see: tab_unreach[] and icmp_err_convert[].
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/tcp_ao/Makefile | 4 +++-
.../testing/selftests/net/tcp_ao/icmps-accept.c | 1 +
.../selftests/net/tcp_ao/icmps-discard.c | 17 +++++++++++++++--
3 files changed, 19 insertions(+), 3 deletions(-)
create mode 120000 tools/testing/selftests/net/tcp_ao/icmps-accept.c
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index 9acfd782c20f..a178bde0af08 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-TEST_BOTH_AF := connect icmps-discard
+TEST_BOTH_AF := connect icmps-discard icmps-accept
TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
@@ -43,3 +43,5 @@ $(OUTPUT)/%_ipv4: %.c
$(OUTPUT)/%_ipv6: %.c
$(LINK.c) -DIPV6_TEST $^ $(LDLIBS) -o $@
+$(OUTPUT)/icmps-accept_ipv4: CFLAGS+= -DTEST_ICMPS_ACCEPT
+$(OUTPUT)/icmps-accept_ipv6: CFLAGS+= -DTEST_ICMPS_ACCEPT
diff --git a/tools/testing/selftests/net/tcp_ao/icmps-accept.c b/tools/testing/selftests/net/tcp_ao/icmps-accept.c
new file mode 120000
index 000000000000..0a5bb85eb260
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/icmps-accept.c
@@ -0,0 +1 @@
+icmps-discard.c
\ No newline at end of file
diff --git a/tools/testing/selftests/net/tcp_ao/icmps-discard.c b/tools/testing/selftests/net/tcp_ao/icmps-discard.c
index 07eba1308b4e..d90017dfc20d 100644
--- a/tools/testing/selftests/net/tcp_ao/icmps-discard.c
+++ b/tools/testing/selftests/net/tcp_ao/icmps-discard.c
@@ -43,8 +43,17 @@ const int sk_ip_level = SOL_IP;
const int sk_recverr = IP_RECVERR;
#endif
-#define test_icmps_fail test_fail
-#define test_icmps_ok test_ok
+/*
+ * Server is expected to fail with hard error if
+ * TCP_AO_CMDF_ACCEPT_ICMP is set
+ */
+#ifdef TEST_ICMPS_ACCEPT
+# define test_icmps_fail test_ok
+# define test_icmps_ok test_fail
+#else
+# define test_icmps_fail test_fail
+# define test_icmps_ok test_ok
+#endif
static void serve_interfered(int sk)
{
@@ -98,6 +107,10 @@ static void *server_fn(void *arg)
lsk = test_listen_socket(this_ip_addr, test_server_port, 1);
+#ifdef TEST_ICMPS_ACCEPT
+ flags = TCP_AO_CMDF_ACCEPT_ICMP;
+#endif
+
if (test_set_ao(lsk, "password", flags, this_ip_dest, -1, 100, 100))
test_error("setsockopt(TCP_AO)");
synchronize_threads();
--
2.38.1
Add Sequence Number Extension (SNE) extension for TCP-AO.
This is needed to protect long-living TCP-AO connections from replaying
attacks after sequence number roll-over, see RFC5925 (6.2).
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
net/ipv4/tcp_input.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index df3087c8179f..2ba46d5db421 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3528,9 +3528,21 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp,
static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
{
u32 delta = ack - tp->snd_una;
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao;
+#endif
sock_owned_by_me((struct sock *)tp);
tp->bytes_acked += delta;
+#ifdef CONFIG_TCP_AO
+ ao = rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held((struct sock *)tp));
+ if (ao) {
+ if (ack < ao->snd_sne_seq)
+ ao->snd_sne++;
+ ao->snd_sne_seq = ack;
+ }
+#endif
tp->snd_una = ack;
}
@@ -3538,9 +3550,21 @@ static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq)
{
u32 delta = seq - tp->rcv_nxt;
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao;
+#endif
sock_owned_by_me((struct sock *)tp);
tp->bytes_received += delta;
+#ifdef CONFIG_TCP_AO
+ ao = rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held((struct sock *)tp));
+ if (ao) {
+ if (seq < ao->rcv_sne_seq)
+ ao->rcv_sne++;
+ ao->rcv_sne_seq = seq;
+ }
+#endif
WRITE_ONCE(tp->rcv_nxt, seq);
}
@@ -6357,6 +6381,17 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
* simultaneous connect with crossed SYNs.
* Particularly, it can be connect to self.
*/
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_info *ao;
+
+ ao = rcu_dereference_protected(tp->ao_info,
+ lockdep_sock_is_held(sk));
+ if (ao) {
+ ao->risn = th->seq;
+ ao->rcv_sne = 0;
+ ao->rcv_sne_seq = ntohl(th->seq);
+ }
+#endif
tcp_set_state(sk, TCP_SYN_RECV);
if (tp->rx_opt.saw_tstamp) {
--
2.38.1
Introduce segment counters that are useful for troubleshooting/debugging
as well as for writing tests.
Now there are global snmp counters as well as per-socket and per-key.
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/dropreason.h | 15 +++++++++++----
include/net/tcp.h | 9 ++++++++-
include/net/tcp_ao.h | 10 ++++++++++
include/uapi/linux/snmp.h | 4 ++++
net/ipv4/proc.c | 4 ++++
net/ipv4/tcp_ao.c | 25 ++++++++++++++++++++++---
6 files changed, 59 insertions(+), 8 deletions(-)
diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index 1359b15a53f3..bd92bb1a0d94 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -148,17 +148,24 @@ enum skb_drop_reason {
*/
SKB_DROP_REASON_TCP_MD5FAILURE,
/**
- * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected
+ * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected,
+ * corresponding to LINUX_MIB_TCPAOREQUIRED
*/
SKB_DROP_REASON_TCP_AONOTFOUND,
/**
* @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it
- * was not expected.
+ * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
*/
SKB_DROP_REASON_TCP_AOUNEXPECTED,
- /** @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown */
+ /**
+ * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown,
+ * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND
+ */
SKB_DROP_REASON_TCP_AOKEYNOTFOUND,
- /** @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong */
+ /**
+ * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong,
+ * corresponding to LINUX_MIB_TCPAOBAD
+ */
SKB_DROP_REASON_TCP_AOFAILURE,
/**
* @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog (
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 454401452a93..72a1fe015c57 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2548,8 +2548,15 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
* always at least one current_key.
*/
#ifdef CONFIG_TCP_AO
- if (unlikely(tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0)))
+ if (unlikely(tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0))) {
+ struct tcp_ao_info *ao_info;
+
+ ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info,
+ lockdep_sock_is_held(sk));
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED);
+ atomic64_inc(&ao_info->counters.ao_required);
return SKB_DROP_REASON_TCP_AONOTFOUND;
+ }
#endif
if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 5eb4ae84b333..cc9925644118 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -20,6 +20,13 @@ struct tcp_ao_hdr {
u8 rnext_keyid;
};
+struct tcp_ao_counters {
+ atomic64_t pkt_good;
+ atomic64_t pkt_bad;
+ atomic64_t key_not_found;
+ atomic64_t ao_required;
+};
+
struct tcp_ao_key {
struct hlist_node node;
union tcp_ao_addr addr;
@@ -35,6 +42,8 @@ struct tcp_ao_key {
u8 maclen;
u8 digest_size;
struct rcu_head rcu;
+ atomic64_t pkt_good;
+ atomic64_t pkt_bad;
u8 traffic_keys[];
};
@@ -78,6 +87,7 @@ struct tcp_ao_info {
*/
struct tcp_ao_key *volatile current_key;
struct tcp_ao_key *rnext_key;
+ struct tcp_ao_counters counters;
u8 ao_flags;
__be32 lisn;
__be32 risn;
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index 4d7470036a8b..f09119db8b40 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -292,6 +292,10 @@ enum
LINUX_MIB_TCPDSACKIGNOREDDUBIOUS, /* TCPDSACKIgnoredDubious */
LINUX_MIB_TCPMIGRATEREQSUCCESS, /* TCPMigrateReqSuccess */
LINUX_MIB_TCPMIGRATEREQFAILURE, /* TCPMigrateReqFailure */
+ LINUX_MIB_TCPAOREQUIRED, /* TCPAORequired */
+ LINUX_MIB_TCPAOBAD, /* TCPAOBad */
+ LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */
+ LINUX_MIB_TCPAOGOOD, /* TCPAOGood */
__LINUX_MIB_MAX
};
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 5386f460bd20..689957a81553 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -297,6 +297,10 @@ static const struct snmp_mib snmp4_net_list[] = {
SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
+ SNMP_MIB_ITEM("TCPAORequired", LINUX_MIB_TCPAOREQUIRED),
+ SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD),
+ SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND),
+ SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD),
SNMP_MIB_SENTINEL
};
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 93bba5e791dd..cdd4e4ed69cf 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -222,6 +222,8 @@ static struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk,
*new_key = *key;
INIT_HLIST_NODE(&new_key->node);
crypto_pool_add(new_key->crypto_pool_id);
+ atomic64_set(&new_key->pkt_good, 0);
+ atomic64_set(&new_key->pkt_bad, 0);
return new_key;
}
@@ -702,14 +704,25 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr);
const struct tcphdr *th = tcp_hdr(skb);
- if (maclen != tcp_ao_maclen(key))
+ if (maclen != tcp_ao_maclen(key)) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+ atomic64_inc(&info->counters.pkt_bad);
+ atomic64_inc(&key->pkt_bad);
return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
/* XXX: make it per-AF callback? */
tcp_ao_hash_skb(family, newhash, key, sk, skb, traffic_key,
(phash - (u8 *)th), sne);
- if (memcmp(phash, newhash, maclen))
+ if (memcmp(phash, newhash, maclen)) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+ atomic64_inc(&info->counters.pkt_bad);
+ atomic64_inc(&key->pkt_bad);
return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD);
+ atomic64_inc(&info->counters.pkt_good);
+ atomic64_inc(&key->pkt_good);
return SKB_NOT_DROPPED_YET;
}
@@ -729,8 +742,10 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
u32 sne = 0;
info = rcu_dereference(tcp_sk(sk)->ao_info);
- if (!info)
+ if (!info) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
return SKB_DROP_REASON_TCP_AOUNEXPECTED;
+ }
/* Fast-path */
/* TODO: fix fastopen and simultaneous open (TCPF_SYN_RECV) */
@@ -821,6 +836,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
traffic_key, phash, sne);
key_not_found:
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
+ atomic64_inc(&info->counters.key_not_found);
return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
}
@@ -1497,6 +1514,8 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
key->keyflags = cmd.tcpa_keyflags;
key->sndid = cmd.tcpa_sndid;
key->rcvid = cmd.tcpa_rcvid;
+ atomic64_set(&key->pkt_good, 0);
+ atomic64_set(&key->pkt_bad, 0);
ret = tcp_ao_parse_crypto(&cmd, key);
if (ret < 0)
--
2.38.1
Add a helper for logging connection-detailed messages for failed TCP
hash verification (both MD5 and AO).
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp.h | 14 ++++++++++++--
include/net/tcp_ao.h | 27 +++++++++++++++++++++++++++
net/ipv4/tcp.c | 23 +++++++++++++----------
net/ipv4/tcp_ao.c | 7 +++++++
4 files changed, 59 insertions(+), 12 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 72a1fe015c57..5512eb940441 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2527,12 +2527,19 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
int l3index;
/* Invalid option or two times meet any of auth options */
- if (tcp_parse_auth_options(th, &md5_location, &aoh))
+ if (tcp_parse_auth_options(th, &md5_location, &aoh)) {
+ tcp_hash_fail("TCP segment has incorrect auth options set",
+ family, skb, "");
return SKB_DROP_REASON_TCP_AUTH_HDR;
+ }
if (req) {
- if (tcp_rsk_used_ao(req) != !!aoh)
+ if (tcp_rsk_used_ao(req) != !!aoh) {
+ tcp_hash_fail("TCP connection can't start/end using TCP-AO",
+ family, skb, " %s",
+ !aoh ? "missing AO" : "AO signed");
return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
}
/* sdif set, means packet ingressed via a device
@@ -2555,11 +2562,14 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
lockdep_sock_is_held(sk));
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED);
atomic64_inc(&ao_info->counters.ao_required);
+ tcp_hash_fail("AO hash is required, but not found",
+ family, skb, "");
return SKB_DROP_REASON_TCP_AONOTFOUND;
}
#endif
if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
+ tcp_hash_fail("MD5 Hash not found", family, skb, "");
return SKB_DROP_REASON_TCP_MD5NOTFOUND;
}
return SKB_NOT_DROPPED_YET;
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index cc9925644118..b5ebc133399e 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -98,6 +98,33 @@ struct tcp_ao_info {
atomic_t refcnt; /* Protects twsk destruction */
};
+#define tcp_hash_fail(msg, family, skb, fmt, ...) \
+do { \
+ const struct tcphdr *th = tcp_hdr(skb); \
+ char hdr_flags[5] = {}; \
+ char *f = hdr_flags; \
+ \
+ if (th->fin) \
+ *f++ = 'F'; \
+ if (th->syn) \
+ *f++ = 'S'; \
+ if (th->rst) \
+ *f++ = 'R'; \
+ if (th->ack) \
+ *f = 'A'; \
+ if (family == AF_INET) { \
+ net_info_ratelimited("%s for (%pI4, %d)->(%pI4, %d) %s" fmt "\n", \
+ msg, &ip_hdr(skb)->saddr, ntohs(th->source), \
+ &ip_hdr(skb)->daddr, ntohs(th->dest), \
+ hdr_flags, ##__VA_ARGS__); \
+ } else { \
+ net_info_ratelimited("%s for [%pI6c]:%u->[%pI6c]:%u %s" fmt "\n", \
+ msg, &ipv6_hdr(skb)->saddr, ntohs(th->source), \
+ &ipv6_hdr(skb)->daddr, ntohs(th->dest), \
+ hdr_flags, ##__VA_ARGS__); \
+ } \
+} while (0)
+
#ifdef CONFIG_TCP_AO
/* TCP-AO structures and functions */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7bfbb6330752..8d64bdec3af8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4523,7 +4523,6 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
* o MD5 hash and we're not expecting one.
* o MD5 hash and its wrong.
*/
- const struct tcphdr *th = tcp_hdr(skb);
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *key;
int genhash;
@@ -4533,6 +4532,7 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
if (!key && hash_location) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
+ tcp_hash_fail("Unexpected MD5 Hash found", family, skb, "");
return SKB_DROP_REASON_TCP_MD5UNEXPECTED;
}
@@ -4548,16 +4548,19 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
if (family == AF_INET) {
- net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n",
- saddr, ntohs(th->source),
- daddr, ntohs(th->dest),
- genhash ? " tcp_v4_calc_md5_hash failed"
- : "", l3index);
+ tcp_hash_fail("MD5 Hash failed", AF_INET, skb, "%s L3 index %d",
+ genhash ? " tcp_v4_calc_md5_hash failed"
+ : "", l3index);
} else {
- net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n",
- genhash ? "failed" : "mismatch",
- saddr, ntohs(th->source),
- daddr, ntohs(th->dest), l3index);
+ if (genhash) {
+ tcp_hash_fail("MD5 Hash failed",
+ AF_INET6, skb, " L3 index %d",
+ l3index);
+ } else {
+ tcp_hash_fail("MD5 Hash mismatch",
+ AF_INET6, skb, " L3 index %d",
+ l3index);
+ }
}
return SKB_DROP_REASON_TCP_MD5FAILURE;
}
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index cdd4e4ed69cf..307b279d55f5 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -708,6 +708,8 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
atomic64_inc(&info->counters.pkt_bad);
atomic64_inc(&key->pkt_bad);
+ tcp_hash_fail("AO hash wrong length", family, skb,
+ " %u != %d", maclen, tcp_ao_maclen(key));
return SKB_DROP_REASON_TCP_AOFAILURE;
}
@@ -718,6 +720,7 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb,
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
atomic64_inc(&info->counters.pkt_bad);
atomic64_inc(&key->pkt_bad);
+ tcp_hash_fail("AO hash mismatch", family, skb, "");
return SKB_DROP_REASON_TCP_AOFAILURE;
}
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD);
@@ -744,6 +747,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
info = rcu_dereference(tcp_sk(sk)->ao_info);
if (!info) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
+ tcp_hash_fail("AO key not found", family, skb,
+ " keyid: %u", aoh->keyid);
return SKB_DROP_REASON_TCP_AOUNEXPECTED;
}
@@ -838,6 +843,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
key_not_found:
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND);
atomic64_inc(&info->counters.key_not_found);
+ tcp_hash_fail("Requested by the peer AO key id not found",
+ family, skb, "");
return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
}
--
2.38.1
The test plan was (most of tests have all 3 client types):
1. TCP-AO listen (INADDR_ANY)
2. TCP-MD5 listen (INADDR_ANY)
3. non-signed listen (INADDR_ANY)
4. TCP-AO + TCP-MD5 listen (prefix)
5. TCP-AO subprefix add failure [checked in setsockopt-closed.c]
6. TCP-AO out of prefix connect [checked in connect-deny.c]
7. TCP-AO + TCP-MD5 on connect()
8. TCP-AO intersect with TCP-MD5 failure
9. Established TCP-AO: add TCP-MD5 key
10. Established TCP-MD5: add TCP-AO key
11. Established non-signed: add TCP-AO key
Output produced:
1..42
TAP version 13
ok 1 AO server (INADDR_ANY): AO client: connected
ok 2 AO server (INADDR_ANY): AO client: counter TCPAOGood increased 0 => 2
ok 3 AO server (INADDR_ANY): MD5 client
ok 4 AO server (INADDR_ANY): MD5 client: counter TCPMD5Unexpected increased 0 => 1
ok 5 AO server (INADDR_ANY): no sign client: counter TCPAORequired increased 0 => 1
ok 6 AO server (INADDR_ANY): unsigned client
ok 7 MD5 server (INADDR_ANY): AO client: counter TCPAOKeyNotFound increased 0 => 1
ok 8 MD5 server (INADDR_ANY): AO client
ok 9 MD5 server (INADDR_ANY): MD5 client: connected
ok 10 MD5 server (INADDR_ANY): no sign client: counter TCPMD5NotFound increased 0 => 1
ok 11 MD5 server (INADDR_ANY): no sign client
ok 12 no sign server: AO client
ok 13 no sign server: AO client: counter TCPAOKeyNotFound increased 1 => 2
ok 14 no sign server: MD5 client
ok 15 no sign server: MD5 client: counter TCPMD5Unexpected increased 1 => 2
ok 16 no sign server: no sign client: connected
ok 17 no sign server: no sign client: counter CurrEstab increased 0 => 1
ok 18 AO+MD5 server: AO client (matching): connected
ok 19 AO+MD5 server: AO client (matching): counter TCPAOGood increased 4 => 6
ok 20 AO+MD5 server: AO client (misconfig, matching MD5)
ok 21 AO+MD5 server: AO client (misconfig, matching MD5): counter TCPAOKeyNotFound increased 2 => 3
ok 22 AO+MD5 server: AO client (misconfig, non-matching): counter TCPAOKeyNotFound increased 3 => 4
ok 23 AO+MD5 server: AO client (misconfig, non-matching)
ok 24 AO+MD5 server: MD5 client (matching): connected
ok 25 AO+MD5 server: MD5 client (misconfig, matching AO)
ok 26 AO+MD5 server: MD5 client (misconfig, matching AO): counter TCPMD5Unexpected increased 2 => 3
ok 27 AO+MD5 server: MD5 client (misconfig, non-matching): counter TCPMD5Unexpected increased 3 => 4
ok 28 AO+MD5 server: MD5 client (misconfig, non-matching)
ok 29 AO+MD5 server: no sign client (unmatched): connected
ok 30 AO+MD5 server: no sign client (unmatched): counter CurrEstab increased 0 => 1
ok 31 AO+MD5 server: no sign client (misconfig, matching AO)
ok 32 AO+MD5 server: no sign client (misconfig, matching AO): counter TCPAORequired increased 1 => 2
ok 33 AO+MD5 server: no sign client (misconfig, matching MD5)
ok 34 AO+MD5 server: no sign client (misconfig, matching MD5): counter TCPMD5NotFound increased 1 => 2
ok 35 AO+MD5 server: client with both [TCP-MD5] and TCP-AO keys: connect() was prevented
ok 36 AO+MD5 server: client with both TCP-MD5 and [TCP-AO] keys: connect() was prevented
ok 37 TCP-AO established: add TCP-MD5 key: postfailed as expected
ok 38 TCP-AO established: add TCP-MD5 key: counter TCPAOGood increased 7 => 9
ok 39 TCP-MD5 established: add TCP-AO key: postfailed as expected
ok 40 non-signed established: add TCP-AO key: postfailed as expected
ok 41 non-signed established: add TCP-AO key: counter CurrEstab increased 0 => 1
ok 42 TCP-AO key intersects with TCP-MD5 key: prefailed as expected
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/tcp_ao/Makefile | 2 +-
.../selftests/net/tcp_ao/unsigned-md5.c | 524 ++++++++++++++++++
2 files changed, 525 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/tcp_ao/unsigned-md5.c
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index a001dc2aed4e..da44966f3687 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
TEST_BOTH_AF := connect icmps-discard icmps-accept connect-deny \
- setsockopt-closed
+ setsockopt-closed unsigned-md5
TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
diff --git a/tools/testing/selftests/net/tcp_ao/unsigned-md5.c b/tools/testing/selftests/net/tcp_ao/unsigned-md5.c
new file mode 100644
index 000000000000..1fd24c010588
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/unsigned-md5.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dmitry Safonov <[email protected]> */
+#include <inttypes.h>
+#include "aolib.h"
+#include "../../../../include/linux/bits.h"
+
+typedef uint8_t fault_t;
+#define F_TIMEOUT 1
+#define F_KEYREJECT 2
+#define F_PREINSTALL 3
+#define F_POSTINSTALL 4
+
+#define fault(type) (inj == type)
+
+static const char *md5_password = "Some evil genius, enemy to mankind, must have been the first contriver.";
+static const char *ao_password = "In this hour, I do not believe that any darkness will endure.";
+
+static union tcp_addr client2;
+static union tcp_addr client3;
+
+static int test_set_md5(int sk, const union tcp_addr in_addr, uint8_t prefix)
+{
+ size_t pwd_len = strlen(md5_password);
+ struct tcp_md5sig md5sig = {};
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = in_addr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = in_addr.a4,
+ };
+#endif
+
+ if (prefix > DEFAULT_TEST_PREFIX)
+ prefix = DEFAULT_TEST_PREFIX;
+
+ md5sig.tcpm_keylen = pwd_len;
+ memcpy(md5sig.tcpm_key, md5_password, pwd_len);
+ md5sig.tcpm_flags = TCP_MD5SIG_FLAG_PREFIX;
+ md5sig.tcpm_prefixlen = prefix;
+ memcpy(&md5sig.tcpm_addr, &addr, sizeof(addr));
+
+ return setsockopt(sk, IPPROTO_TCP, TCP_MD5SIG_EXT,
+ &md5sig, sizeof(md5sig));
+}
+
+static bool tcp_md5_enabled = true;
+static void check_tcp_md5_support(void)
+{
+ int sk;
+ union tcp_addr addr_any = {};
+
+ sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sk < 0)
+ test_error("socket()");
+
+ if (test_set_md5(sk, addr_any, 0)) {
+ if (errno == ENOPROTOOPT)
+ tcp_md5_enabled = false;
+ else
+ test_error("setsockopt(TCP_MD5SIG_EXT)");
+ }
+ close(sk);
+}
+
+static void try_accept(const char *tst_name, unsigned int port,
+ union tcp_addr *md5_addr, uint8_t md5_prefix,
+ union tcp_addr *ao_addr, uint8_t ao_prefix,
+ uint8_t sndid, uint8_t rcvid, const char *cnt_name,
+ bool needs_md5, fault_t inj)
+{
+ uint64_t before_cnt, after_cnt;
+ int lsk, err, sk = 0;
+ time_t timeout;
+
+ if (needs_md5 && !tcp_md5_enabled) {
+ test_skip("%s: setsockopt(TCP_MD5SIG_EXT) is not supported", tst_name);
+ return;
+ }
+
+ lsk = test_listen_socket(this_ip_addr, port, 1);
+
+ if (md5_addr && test_set_md5(lsk, *md5_addr, md5_prefix))
+ test_error("setsockopt(TCP_MD5SIG_EXT)");
+
+ if (ao_addr && test_set_ao(lsk, ao_password, 0, *ao_addr,
+ ao_prefix, sndid, rcvid))
+ test_error("setsockopt(TCP_AO)");
+
+ if (cnt_name)
+ before_cnt = netstat_get_one(cnt_name, NULL);
+
+ synchronize_threads(); /* preparations done */
+
+ timeout = fault(F_TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
+ err = test_wait_fd(lsk, timeout, 0);
+ if (err < 0)
+ test_error("test_wait_fd()");
+ else if (!err) {
+ if (!fault(F_TIMEOUT))
+ test_fail("timeouted for accept()");
+ } else {
+ if (fault(F_TIMEOUT))
+ test_fail("ready to accept");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0) {
+ test_error("accept()");
+ } else {
+ if (fault(F_TIMEOUT))
+ test_fail("%s: accepted", tst_name);
+ }
+ }
+
+ close(lsk);
+
+ if (!cnt_name)
+ goto out;
+
+ after_cnt = netstat_get_one(cnt_name, NULL);
+
+ if (after_cnt <= before_cnt) {
+ test_fail("%s: %s counter did not increase: %zu <= %zu",
+ tst_name, cnt_name, after_cnt, before_cnt);
+ } else {
+ test_ok("%s: counter %s increased %zu => %zu",
+ tst_name, cnt_name, before_cnt, after_cnt);
+ }
+
+out:
+ synchronize_threads(); /* close() */
+ if (sk > 0)
+ close(sk);
+}
+
+static void server_add_routes(void)
+{
+ int family = TEST_FAMILY;
+
+ check_tcp_md5_support();
+ synchronize_threads(); /* client_add_ips() */
+
+ if (ip_route_add(veth_name, family, this_ip_addr, client2))
+ test_error("Failed to add route");
+ if (ip_route_add(veth_name, family, this_ip_addr, client3))
+ test_error("Failed to add route");
+}
+
+static void server_add_fail_tests(unsigned int *port)
+{
+ union tcp_addr addr_any = {};
+
+ try_accept("TCP-AO established: add TCP-MD5 key", (*port)++, NULL, 0,
+ &addr_any, 0, 100, 100, "TCPAOGood", true, 0);
+ try_accept("TCP-MD5 established: add TCP-AO key", (*port)++, &addr_any, 0,
+ NULL, 0, 0, 0, NULL, true, 0);
+ try_accept("non-signed established: add TCP-AO key", (*port)++, NULL, 0,
+ NULL, 0, 0, 0, "CurrEstab", false, 0);
+}
+
+static void *server_fn(void *arg)
+{
+ unsigned int port = test_server_port;
+ union tcp_addr addr_any = {};
+
+ server_add_routes();
+
+ try_accept("AO server (INADDR_ANY): AO client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, "TCPAOGood", false, 0);
+ try_accept("AO server (INADDR_ANY): MD5 client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, "TCPMD5Unexpected", true, F_TIMEOUT);
+ try_accept("AO server (INADDR_ANY): no sign client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, "TCPAORequired", false, F_TIMEOUT);
+
+ try_accept("MD5 server (INADDR_ANY): AO client", port++, &addr_any, 0,
+ NULL, 0, 0, 0, "TCPAOKeyNotFound", true, F_TIMEOUT);
+ try_accept("MD5 server (INADDR_ANY): MD5 client", port++, &addr_any, 0,
+ NULL, 0, 0, 0, NULL, true, 0);
+ try_accept("MD5 server (INADDR_ANY): no sign client", port++, &addr_any, 0,
+ NULL, 0, 0, 0, "TCPMD5NotFound", true, F_TIMEOUT);
+
+ try_accept("no sign server: AO client", port++, NULL, 0,
+ NULL, 0, 0, 0, "TCPAOKeyNotFound", false, F_TIMEOUT);
+ try_accept("no sign server: MD5 client", port++, NULL, 0,
+ NULL, 0, 0, 0, "TCPMD5Unexpected", true, F_TIMEOUT);
+ try_accept("no sign server: no sign client", port++, NULL, 0,
+ NULL, 0, 0, 0, "CurrEstab", false, 0);
+
+ try_accept("AO+MD5 server: AO client (matching)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPAOGood", true, 0);
+ try_accept("AO+MD5 server: AO client (misconfig, matching MD5)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPAOKeyNotFound", true, F_TIMEOUT);
+ try_accept("AO+MD5 server: AO client (misconfig, non-matching)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPAOKeyNotFound", true, F_TIMEOUT);
+ try_accept("AO+MD5 server: MD5 client (matching)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, NULL, true, 0);
+ try_accept("AO+MD5 server: MD5 client (misconfig, matching AO)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPMD5Unexpected", true, F_TIMEOUT);
+ try_accept("AO+MD5 server: MD5 client (misconfig, non-matching)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPMD5Unexpected", true, F_TIMEOUT);
+ try_accept("AO+MD5 server: no sign client (unmatched)", port++,
+ &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "CurrEstab", true, 0);
+ try_accept("AO+MD5 server: no sign client (misconfig, matching AO)",
+ port++, &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPAORequired", true, F_TIMEOUT);
+ try_accept("AO+MD5 server: no sign client (misconfig, matching MD5)",
+ port++, &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, "TCPMD5NotFound", true, F_TIMEOUT);
+
+ try_accept("AO+MD5 server: client with both [TCP-MD5] and TCP-AO keys",
+ port++, &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, NULL, true, F_TIMEOUT);
+ try_accept("AO+MD5 server: client with both TCP-MD5 and [TCP-AO] keys",
+ port++, &this_ip_dest, TEST_PREFIX, &client2, TEST_PREFIX,
+ 100, 100, NULL, true, F_TIMEOUT);
+
+ server_add_fail_tests(&port);
+
+ /* client exits */
+ synchronize_threads();
+ return NULL;
+}
+
+static int client_bind(int sk, union tcp_addr bind_addr)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = bind_addr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = bind_addr.a4,
+ };
+#endif
+ return bind(sk, &addr, sizeof(addr));
+}
+
+static void try_connect(const char *tst_name, unsigned int port,
+ union tcp_addr *md5_addr, uint8_t md5_prefix,
+ union tcp_addr *ao_addr, uint8_t ao_prefix,
+ uint8_t sndid, uint8_t rcvid, fault_t inj,
+ bool needs_md5, union tcp_addr *bind_addr)
+{
+ time_t timeout;
+ int sk, ret;
+
+ if (needs_md5 && !tcp_md5_enabled) {
+ test_skip("%s: setsockopt(TCP_MD5SIG_EXT) is not supported", tst_name);
+ return;
+ }
+
+ sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sk < 0)
+ test_error("socket()");
+
+ if (bind_addr && client_bind(sk, *bind_addr))
+ test_error("bind()");
+
+ if (md5_addr && test_set_md5(sk, *md5_addr, md5_prefix))
+ test_error("setsockopt(TCP_MD5SIG_EXT)");
+
+ if (ao_addr && test_set_ao(sk, ao_password, 0, *ao_addr,
+ ao_prefix, sndid, rcvid))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads(); /* preparations done */
+
+ timeout = fault(F_TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
+ ret = _test_connect_socket(sk, this_ip_dest, port, timeout);
+
+ if (ret < 0) {
+ if (fault(F_KEYREJECT) && ret == -EKEYREJECTED) {
+ test_ok("%s: connect() was prevented", tst_name);
+ goto out;
+ } else if (ret == -ECONNREFUSED &&
+ (fault(F_TIMEOUT) || fault(F_KEYREJECT))) {
+ test_ok("%s: refused to connect", tst_name);
+ goto out;
+ } else {
+ test_error("%s: connect() returned %d", tst_name, ret);
+ }
+ }
+
+ if (ret == 0) {
+ if (fault(F_TIMEOUT))
+ test_ok("%s", tst_name);
+ else
+ test_fail("%s: failed to connect()", tst_name);
+ } else {
+ if (fault(F_TIMEOUT) || fault(F_KEYREJECT))
+ test_fail("%s: connected", tst_name);
+ else
+ test_ok("%s: connected", tst_name);
+ }
+
+out:
+ synchronize_threads(); /* close() */
+ /* _test_connect_socket() cleans up on failure */
+ if (ret > 0)
+ close(sk);
+}
+
+#define PREINSTALL_MD5 BIT(1)
+#define POSTINSTALL_MD5 BIT(2)
+#define PREINSTALL_AO BIT(3)
+#define POSTINSTALL_AO BIT(4)
+
+static void try_to_add(const char *tst_name, unsigned int port,
+ unsigned int strategy,
+ union tcp_addr md5_addr, uint8_t md5_prefix,
+ union tcp_addr ao_addr, uint8_t ao_prefix,
+ uint8_t sndid, uint8_t rcvid,
+ bool needs_md5, fault_t inj)
+{
+ time_t timeout;
+ int sk, ret;
+
+ if (needs_md5 && !tcp_md5_enabled) {
+ test_skip("%s: setsockopt(TCP_MD5SIG_EXT) is not supported", tst_name);
+ return;
+ }
+
+ sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sk < 0)
+ test_error("socket()");
+
+ if (client_bind(sk, this_ip_addr))
+ test_error("bind()");
+
+ if (strategy & PREINSTALL_MD5) {
+ if (test_set_md5(sk, md5_addr, md5_prefix))
+ test_error("setsockopt(TCP_MD5SIG_EXT)");
+ }
+
+ if (strategy & PREINSTALL_AO) {
+ if (test_set_ao(sk, ao_password, 0, ao_addr,
+ ao_prefix, sndid, rcvid)) {
+ if (fault(F_PREINSTALL)) {
+ test_ok("%s: prefailed as expected", tst_name);
+ goto out_no_sync;
+ } else {
+ test_error("setsockopt(TCP_AO)");
+ }
+ } else if (fault(F_PREINSTALL)) {
+ test_fail("%s: setsockopt()s were expected to fail", tst_name);
+ goto out_no_sync;
+ }
+ }
+
+ synchronize_threads(); /* preparations done */
+
+ timeout = fault(F_TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
+ ret = _test_connect_socket(sk, this_ip_dest, port, timeout);
+
+ if (ret <= 0) {
+ test_error("%s: connect() returned %d", tst_name, ret);
+ goto out;
+ }
+
+ if (strategy & POSTINSTALL_MD5) {
+ if (test_set_md5(sk, md5_addr, md5_prefix)) {
+ if (fault(F_POSTINSTALL)) {
+ test_ok("%s: postfailed as expected", tst_name);
+ goto out;
+ } else {
+ test_error("setsockopt(TCP_MD5SIG_EXT)");
+ }
+ } else if (fault(F_POSTINSTALL)) {
+ test_fail("%s: post setsockopt() was expected to fail", tst_name);
+ goto out;
+ }
+ }
+
+ if (strategy & POSTINSTALL_AO) {
+ if (test_set_ao(sk, ao_password, 0, ao_addr,
+ ao_prefix, sndid, rcvid)) {
+ if (fault(F_POSTINSTALL)) {
+ test_ok("%s: postfailed as expected", tst_name);
+ goto out;
+ } else {
+ test_error("setsockopt(TCP_AO)");
+ }
+ } else if (fault(F_POSTINSTALL)) {
+ test_fail("%s: post setsockopt() was expected to fail", tst_name);
+ goto out;
+ }
+ }
+
+out:
+ synchronize_threads(); /* close() */
+out_no_sync:
+ /* _test_connect_socket() cleans up on failure */
+ if (ret > 0)
+ close(sk);
+}
+
+static void client_add_ip(union tcp_addr *client, const char *ip)
+{
+ int family = TEST_FAMILY;
+
+ if (inet_pton(family, ip, client) != 1)
+ test_error("Can't convert ip address %s", ip);
+
+ if (ip_addr_add(veth_name, family, *client, TEST_PREFIX))
+ test_error("Failed to add ip address");
+ if (ip_route_add(veth_name, family, *client, this_ip_dest))
+ test_error("Failed to add route");
+}
+
+static void client_add_ips(void)
+{
+ client_add_ip(&client2, __TEST_CLIENT_IP(2));
+ client_add_ip(&client3, __TEST_CLIENT_IP(3));
+ synchronize_threads(); /* server_add_routes() */
+}
+
+static void client_add_fail_tests(unsigned int *port)
+{
+ try_to_add("TCP-AO established: add TCP-MD5 key",
+ (*port)++, POSTINSTALL_MD5 | PREINSTALL_AO,
+ this_ip_dest, TEST_PREFIX, this_ip_dest, TEST_PREFIX,
+ 100, 100, true, F_POSTINSTALL);
+ try_to_add("TCP-MD5 established: add TCP-AO key",
+ (*port)++, PREINSTALL_MD5 | POSTINSTALL_AO,
+ this_ip_dest, TEST_PREFIX, this_ip_dest, TEST_PREFIX,
+ 100, 100, true, F_POSTINSTALL);
+ try_to_add("non-signed established: add TCP-AO key",
+ (*port)++, POSTINSTALL_AO,
+ this_ip_dest, TEST_PREFIX, this_ip_dest, TEST_PREFIX,
+ 100, 100, false, F_POSTINSTALL);
+
+ try_to_add("TCP-AO key intersects with TCP-MD5 key",
+ (*port), PREINSTALL_MD5 | PREINSTALL_AO,
+ this_ip_addr, TEST_PREFIX, this_ip_addr, TEST_PREFIX,
+ 100, 100, true, F_PREINSTALL);
+}
+
+static void *client_fn(void *arg)
+{
+ unsigned int port = test_server_port;
+ union tcp_addr addr_any = {};
+
+ client_add_ips();
+
+ try_connect("AO server (INADDR_ANY): AO client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, 0, false, &this_ip_addr);
+ try_connect("AO server (INADDR_ANY): MD5 client", port++, &addr_any, 0,
+ NULL, 0, 100, 100, F_TIMEOUT, true, &this_ip_addr);
+ try_connect("AO server (INADDR_ANY): unsigned client", port++, NULL, 0,
+ NULL, 0, 100, 100, F_TIMEOUT, false, &this_ip_addr);
+
+ try_connect("MD5 server (INADDR_ANY): AO client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, F_TIMEOUT, true, &this_ip_addr);
+ try_connect("MD5 server (INADDR_ANY): MD5 client", port++, &addr_any, 0,
+ NULL, 0, 100, 100, 0, true, &this_ip_addr);
+ try_connect("MD5 server (INADDR_ANY): no sign client", port++, NULL, 0,
+ NULL, 0, 100, 100, F_TIMEOUT, true, &this_ip_addr);
+
+ try_connect("no sign server: AO client", port++, NULL, 0,
+ &addr_any, 0, 100, 100, F_TIMEOUT, false, &this_ip_addr);
+ try_connect("no sign server: MD5 client", port++, &addr_any, 0,
+ NULL, 0, 100, 100, F_TIMEOUT, true, &this_ip_addr);
+ try_connect("no sign server: no sign client", port++, NULL, 0,
+ NULL, 0, 100, 100, 0, false, &this_ip_addr);
+
+ try_connect("AO+MD5 server: AO client (matching)", port++, NULL, 0,
+ &addr_any, 0, 100, 100, 0, true, &client2);
+ try_connect("AO+MD5 server: AO client (misconfig, matching MD5)",
+ port++, NULL, 0, &addr_any, 0, 100, 100,
+ F_TIMEOUT, true, &this_ip_addr);
+ try_connect("AO+MD5 server: AO client (misconfig, non-matching)",
+ port++, NULL, 0, &addr_any, 0, 100, 100,
+ F_TIMEOUT, true, &client3);
+ try_connect("AO+MD5 server: MD5 client (matching)", port++, &addr_any, 0,
+ NULL, 0, 100, 100, 0, true, &this_ip_addr);
+ try_connect("AO+MD5 server: MD5 client (misconfig, matching AO)",
+ port++, &addr_any, 0, NULL, 0, 100, 100, F_TIMEOUT,
+ true, &client2);
+ try_connect("AO+MD5 server: MD5 client (misconfig, non-matching)",
+ port++, &addr_any, 0, NULL, 0, 100, 100, F_TIMEOUT,
+ true, &client3);
+ try_connect("AO+MD5 server: no sign client (unmatched)",
+ port++, NULL, 0, NULL, 0, 100, 100, 0, true, &client3);
+ try_connect("AO+MD5 server: no sign client (misconfig, matching AO)",
+ port++, NULL, 0, NULL, 0, 100, 100, F_TIMEOUT,
+ true, &client2);
+ try_connect("AO+MD5 server: no sign client (misconfig, matching MD5)",
+ port++, NULL, 0, NULL, 0, 100, 100, F_TIMEOUT,
+ true, &this_ip_addr);
+
+ try_connect("AO+MD5 server: client with both [TCP-MD5] and TCP-AO keys",
+ port++, &this_ip_addr, TEST_PREFIX,
+ &client2, TEST_PREFIX, 100, 100, F_KEYREJECT,
+ true, &this_ip_addr);
+ try_connect("AO+MD5 server: client with both TCP-MD5 and [TCP-AO] keys",
+ port++, &this_ip_addr, TEST_PREFIX,
+ &client2, TEST_PREFIX, 100, 100, F_KEYREJECT, true, &client2);
+
+ client_add_fail_tests(&port);
+
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(42, server_fn, client_fn);
+ return 0;
+}
--
2.38.1
Use -X to set md5 password string and -M to set authentication method as
TCP-MD5. Remove client_pw as not needed. This will allow to add an
option to use TCP-AO as authentication method.
Note, that use_md5 is a bit, rather than an enum member like
`authentication_method` - this will allow to call nettest the way that
it'll try to connect with both tcp-md5 and tcp-ao setsocketopt()
[which shouldn't be allowed].
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/fcnal-test.sh | 232 +++++++++++-----------
tools/testing/selftests/net/nettest.c | 26 ++-
2 files changed, 128 insertions(+), 130 deletions(-)
diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index 31c3b6ebd388..d4516c755858 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -843,9 +843,9 @@ ipv4_tcp_md5_novrf()
# basic use case
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: Single address config"
# client sends MD5, server not configured
@@ -853,23 +853,23 @@ ipv4_tcp_md5_novrf()
show_hint "Should timeout due to MD5 mismatch"
run_cmd nettest -s &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: Server no config, client uses password"
# wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -s -M ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: Client uses wrong password"
# client from different address
log_start
show_hint "Should timeout due to MD5 mismatch"
- run_cmd nettest -s -M ${MD5_PW} -m ${NSB_LO_IP} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NSB_LO_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: Client address does not match address configured with password"
#
@@ -878,25 +878,25 @@ ipv4_tcp_md5_novrf()
# client in prefix
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: Prefix config"
# client in prefix, wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: Prefix config, client uses wrong password"
# client outside of prefix
log_start
show_hint "Should timeout due to MD5 mismatch"
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -c ${NSB_LO_IP} -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -c ${NSB_LO_IP} -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: Prefix config, client address not in configured prefix"
}
@@ -911,9 +911,9 @@ ipv4_tcp_md5()
# basic use case
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Single address config"
# client sends MD5, server not configured
@@ -921,23 +921,23 @@ ipv4_tcp_md5()
show_hint "Should timeout since server does not have MD5 auth"
run_cmd nettest -s -I ${VRF} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Server no config, client uses password"
# wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Client uses wrong password"
# client from different address
log_start
show_hint "Should timeout since server config differs from client"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_LO_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_LO_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Client address does not match address configured with password"
#
@@ -946,25 +946,25 @@ ipv4_tcp_md5()
# client in prefix
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Prefix config"
# client in prefix, wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Prefix config, client uses wrong password"
# client outside of prefix
log_start
show_hint "Should timeout since client address is outside of prefix"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -c ${NSB_LO_IP} -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -c ${NSB_LO_IP} -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Prefix config, client address not in configured prefix"
#
@@ -972,74 +972,74 @@ ipv4_tcp_md5()
#
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Single address config in default VRF and VRF, conn in VRF"
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 0 "MD5: VRF: Single address config in default VRF and VRF, conn in default VRF"
log_start
show_hint "Should timeout since client in default VRF uses VRF password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Single address config in default VRF and VRF, conn in default VRF with VRF pw"
log_start
show_hint "Should timeout since client in VRF uses default VRF password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Single address config in default VRF and VRF, conn in VRF with default VRF pw"
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Prefix config in default VRF and VRF, conn in VRF"
log_start
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 0 "MD5: VRF: Prefix config in default VRF and VRF, conn in default VRF"
log_start
show_hint "Should timeout since client in default VRF uses VRF password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Prefix config in default VRF and VRF, conn in default VRF with VRF pw"
log_start
show_hint "Should timeout since client in VRF uses default VRF password"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} &
- run_cmd nettest -s -M ${MD5_WRONG_PW} -m ${NS_NET} &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} &
+ run_cmd nettest -s -M -X ${MD5_WRONG_PW} -m ${NS_NET} &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Prefix config in default VRF and VRF, conn in VRF with default VRF pw"
#
# negative tests
#
log_start
- run_cmd nettest -s -I ${NSA_DEV} -M ${MD5_PW} -m ${NSB_IP}
+ run_cmd nettest -s -I ${NSA_DEV} -M -X ${MD5_PW} -m ${NSB_IP}
log_test $? 1 "MD5: VRF: Device must be a VRF - single address"
log_start
- run_cmd nettest -s -I ${NSA_DEV} -M ${MD5_PW} -m ${NS_NET}
+ run_cmd nettest -s -I ${NSA_DEV} -M -X ${MD5_PW} -m ${NS_NET}
log_test $? 1 "MD5: VRF: Device must be a VRF - prefix"
test_ipv4_md5_vrf__vrf_server__no_bind_ifindex
@@ -1050,16 +1050,16 @@ test_ipv4_md5_vrf__vrf_server__no_bind_ifindex()
{
log_start
show_hint "Simulates applications using VRF without TCP_MD5SIG_FLAG_IFINDEX"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: VRF-bound server, unbound key accepts connection"
log_start
show_hint "Binding both the socket and the key is not required but it works"
- run_cmd nettest -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
+ run_cmd nettest -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: VRF-bound server, bound key accepts connection"
}
@@ -1071,27 +1071,27 @@ test_ipv4_md5_vrf__global_server__bind_ifindex0()
set_sysctl net.ipv4.tcp_l3mdev_accept=1
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Global server, Key bound to ifindex=0 rejects VRF connection"
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} --force-bind-key-ifindex &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Global server, key bound to ifindex=0 accepts non-VRF connection"
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
sleep 1
- run_cmd_nsb nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsb nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Global server, key not bound to ifindex accepts VRF connection"
log_start
- run_cmd nettest -s -M ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
+ run_cmd nettest -s -M -X ${MD5_PW} -m ${NS_NET} --no-bind-key-ifindex &
sleep 1
- run_cmd_nsc nettest -r ${NSA_IP} -X ${MD5_PW}
+ run_cmd_nsc nettest -r ${NSA_IP} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Global server, key not bound to ifindex accepts non-VRF connection"
# restore value
@@ -2454,9 +2454,9 @@ ipv6_tcp_md5_novrf()
# basic use case
log_start
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: Single address config"
# client sends MD5, server not configured
@@ -2464,23 +2464,23 @@ ipv6_tcp_md5_novrf()
show_hint "Should timeout due to MD5 mismatch"
run_cmd nettest -6 -s &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: Server no config, client uses password"
# wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: Client uses wrong password"
# client from different address
log_start
show_hint "Should timeout due to MD5 mismatch"
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NSB_LO_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NSB_LO_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: Client address does not match address configured with password"
#
@@ -2489,25 +2489,25 @@ ipv6_tcp_md5_novrf()
# client in prefix
log_start
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: Prefix config"
# client in prefix, wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: Prefix config, client uses wrong password"
# client outside of prefix
log_start
show_hint "Should timeout due to MD5 mismatch"
- run_cmd nettest -6 -s -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -c ${NSB_LO_IP6} -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -c ${NSB_LO_IP6} -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: Prefix config, client address not in configured prefix"
}
@@ -2522,9 +2522,9 @@ ipv6_tcp_md5()
# basic use case
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Single address config"
# client sends MD5, server not configured
@@ -2532,23 +2532,23 @@ ipv6_tcp_md5()
show_hint "Should timeout since server does not have MD5 auth"
run_cmd nettest -6 -s -I ${VRF} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Server no config, client uses password"
# wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Client uses wrong password"
# client from different address
log_start
show_hint "Should timeout since server config differs from client"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_LO_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_LO_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Client address does not match address configured with password"
#
@@ -2557,25 +2557,25 @@ ipv6_tcp_md5()
# client in prefix
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Prefix config"
# client in prefix, wrong password
log_start
show_hint "Should timeout since client uses wrong password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Prefix config, client uses wrong password"
# client outside of prefix
log_start
show_hint "Should timeout since client address is outside of prefix"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -c ${NSB_LO_IP6} -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -c ${NSB_LO_IP6} -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Prefix config, client address not in configured prefix"
#
@@ -2583,74 +2583,74 @@ ipv6_tcp_md5()
#
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Single address config in default VRF and VRF, conn in VRF"
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsc nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsc nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 0 "MD5: VRF: Single address config in default VRF and VRF, conn in default VRF"
log_start
show_hint "Should timeout since client in default VRF uses VRF password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsc nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsc nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Single address config in default VRF and VRF, conn in default VRF with VRF pw"
log_start
show_hint "Should timeout since client in VRF uses default VRF password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NSB_IP6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NSB_IP6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NSB_IP6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Single address config in default VRF and VRF, conn in VRF with default VRF pw"
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 0 "MD5: VRF: Prefix config in default VRF and VRF, conn in VRF"
log_start
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsc nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsc nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 0 "MD5: VRF: Prefix config in default VRF and VRF, conn in default VRF"
log_start
show_hint "Should timeout since client in default VRF uses VRF password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsc nettest -6 -r ${NSA_IP6} -X ${MD5_PW}
+ run_cmd_nsc nettest -6 -r ${NSA_IP6} -M -X ${MD5_PW}
log_test $? 2 "MD5: VRF: Prefix config in default VRF and VRF, conn in default VRF with VRF pw"
log_start
show_hint "Should timeout since client in VRF uses default VRF password"
- run_cmd nettest -6 -s -I ${VRF} -M ${MD5_PW} -m ${NS_NET6} &
- run_cmd nettest -6 -s -M ${MD5_WRONG_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -I ${VRF} -M -X ${MD5_PW} -m ${NS_NET6} &
+ run_cmd nettest -6 -s -M -X ${MD5_WRONG_PW} -m ${NS_NET6} &
sleep 1
- run_cmd_nsb nettest -6 -r ${NSA_IP6} -X ${MD5_WRONG_PW}
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -M -X ${MD5_WRONG_PW}
log_test $? 2 "MD5: VRF: Prefix config in default VRF and VRF, conn in VRF with default VRF pw"
#
# negative tests
#
log_start
- run_cmd nettest -6 -s -I ${NSA_DEV} -M ${MD5_PW} -m ${NSB_IP6}
+ run_cmd nettest -6 -s -I ${NSA_DEV} -M -X ${MD5_PW} -m ${NSB_IP6}
log_test $? 1 "MD5: VRF: Device must be a VRF - single address"
log_start
- run_cmd nettest -6 -s -I ${NSA_DEV} -M ${MD5_PW} -m ${NS_NET6}
+ run_cmd nettest -6 -s -I ${NSA_DEV} -M -X ${MD5_PW} -m ${NS_NET6}
log_test $? 1 "MD5: VRF: Device must be a VRF - prefix"
}
diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c
index 7900fa98eccb..b9e600899cf6 100644
--- a/tools/testing/selftests/net/nettest.c
+++ b/tools/testing/selftests/net/nettest.c
@@ -76,7 +76,8 @@ struct sock_args {
has_grp:1,
has_expected_laddr:1,
has_expected_raddr:1,
- bind_test_only:1;
+ bind_test_only:1,
+ use_md5:1;
unsigned short port;
@@ -95,7 +96,6 @@ struct sock_args {
const char *serverns;
const char *password;
- const char *client_pw;
/* prefix for MD5 password */
const char *md5_prefix_str;
union {
@@ -1546,7 +1546,7 @@ static int do_server(struct sock_args *args, int ipc_fd)
return rc;
}
- if (args->password && tcp_md5_remote(lsd, args)) {
+ if (args->use_md5 && tcp_md5_remote(lsd, args)) {
close(lsd);
goto err_exit;
}
@@ -1670,7 +1670,7 @@ static int connectsock(void *addr, socklen_t alen, struct sock_args *args)
if (args->type != SOCK_STREAM && !args->datagram_connect)
goto out;
- if (args->password && tcp_md5sig(sd, addr, alen, args))
+ if (args->use_md5 && tcp_md5sig(sd, addr, alen, args))
goto err;
if (args->bind_test_only)
@@ -1751,8 +1751,6 @@ static int do_client(struct sock_args *args)
break;
}
- args->password = args->client_pw;
-
if (args->has_grp)
sd = msock_client(args);
else
@@ -1862,7 +1860,7 @@ static int ipc_parent(int cpid, int fd, struct sock_args *args)
return client_status;
}
-#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SUCi6xL:0:1:2:3:Fbqf"
+#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:MX:m:d:I:BN:O:SUCi6xL:0:1:2:3:Fbqf"
#define OPT_FORCE_BIND_KEY_IFINDEX 1001
#define OPT_NO_BIND_KEY_IFINDEX 1002
@@ -1906,8 +1904,8 @@ static void print_usage(char *prog)
" -L len send random message of given length\n"
" -n num number of times to send message\n"
"\n"
- " -M password use MD5 sum protection\n"
- " -X password MD5 password for client mode\n"
+ " -M use MD5 sum protection\n"
+ " -X password MD5 password\n"
" -m prefix/len prefix and length to use for MD5 key\n"
" --no-bind-key-ifindex: Force TCP_MD5SIG_FLAG_IFINDEX off\n"
" --force-bind-key-ifindex: Force TCP_MD5SIG_FLAG_IFINDEX on\n"
@@ -2019,7 +2017,7 @@ int main(int argc, char *argv[])
msg = random_msg(atoi(optarg));
break;
case 'M':
- args.password = optarg;
+ args.use_md5 = 1;
break;
case OPT_FORCE_BIND_KEY_IFINDEX:
args.bind_key_ifindex = 1;
@@ -2028,7 +2026,7 @@ int main(int argc, char *argv[])
args.bind_key_ifindex = -1;
break;
case 'X':
- args.client_pw = optarg;
+ args.password = optarg;
break;
case 'm':
args.md5_prefix_str = optarg;
@@ -2092,14 +2090,14 @@ int main(int argc, char *argv[])
}
}
- if (args.password &&
- ((!args.has_remote_ip && !args.md5_prefix_str) ||
+ if (args.password && (!args.use_md5 ||
+ (!args.has_remote_ip && !args.md5_prefix_str) ||
args.type != SOCK_STREAM)) {
log_error("MD5 passwords apply to TCP only and require a remote ip for the password\n");
return 1;
}
- if (args.md5_prefix_str && !args.password) {
+ if ((args.md5_prefix_str || args.use_md5) && !args.password) {
log_error("Prefix range for MD5 protection specified without a password\n");
return 1;
}
--
2.38.1
Provide setsockopt() key flag that makes TCP-AO exclude hashing TCP
header for peers that match the key. This is needed for interraction
with middleboxes that may change TCP options, see RFC5925 (9.2).
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/uapi/linux/tcp.h | 2 ++
net/ipv4/tcp_ao.c | 8 +++++---
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 508bedbc6ad8..b60933ee2a27 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -347,6 +347,8 @@ struct tcp_diag_md5sig {
#define TCP_AO_MAXKEYLEN 80
+#define TCP_AO_KEYF_EXCLUDE_OPT (1 << 0)
+
#define TCP_AO_CMDF_CURR (1 << 0) /* Only checks field sndid */
#define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */
#define TCP_AO_CMDF_ACCEPT_ICMP (1 << 2) /* Accept incoming ICMPs */
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index e5b4e9f1e83e..90b864d4ee7d 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -604,7 +604,8 @@ int tcp_ao_hash_hdr(unsigned short int family, char *ao_hash,
WARN_ON_ONCE(1);
goto clear_hash;
}
- if (tcp_ao_hash_header(&hp, th, false,
+ if (tcp_ao_hash_header(&hp, th,
+ !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT),
ao_hash, hash_offset, tcp_ao_maclen(key)))
goto clear_hash;
ahash_request_set_crypt(hp.req, NULL, ao_hash, 0);
@@ -646,7 +647,8 @@ int tcp_ao_hash_skb(unsigned short int family,
goto clear_hash;
if (tcp_ao_hash_pseudoheader(family, sk, skb, &hp, skb->len))
goto clear_hash;
- if (tcp_ao_hash_header(&hp, th, false,
+ if (tcp_ao_hash_header(&hp, th,
+ !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT),
ao_hash, hash_offset, tcp_ao_maclen(key)))
goto clear_hash;
if (tcp_ao_hash_skb_data(&hp, skb, th->doff << 2))
@@ -1497,7 +1499,7 @@ static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
}
#endif
-#define TCP_AO_KEYF_ALL (0)
+#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_EXCLUDE_OPT)
#define TCP_AO_CMDF_ADDMOD_VALID \
(TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_ACCEPT_ICMP)
#define TCP_AO_CMDF_DEL_VALID \
--
2.38.1
Delete becomes very, very fast - almost free, but after setsockopt()
syscall returns, the key is still alive until next RCU grace period.
Which is fine for listen sockets as userspace needs to be aware of
setsockopt(TCP_AO) and accept() race and resolve it with verification
by getsockopt() after TCP connection was accepted.
The benchmark results (on non-loaded box, worse with more RCU work pending):
> ok 33 Worst case delete 16384 keys: min=5ms max=10ms mean=6.93904ms stddev=0.263421
> ok 34 Add a new key 16384 keys: min=1ms max=4ms mean=2.17751ms stddev=0.147564
> ok 35 Remove random-search 16384 keys: min=5ms max=10ms mean=6.50243ms stddev=0.254999
> ok 36 Remove async 16384 keys: min=0ms max=0ms mean=0.0296107ms stddev=0.0172078
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/uapi/linux/tcp.h | 3 +++
net/ipv4/tcp_ao.c | 17 ++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 453187d21da8..42850ae6e99d 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -353,6 +353,9 @@ struct tcp_diag_md5sig {
#define TCP_AO_CMDF_CURR (1 << 0) /* Only checks field sndid */
#define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */
#define TCP_AO_CMDF_ACCEPT_ICMP (1 << 2) /* Accept incoming ICMPs */
+#define TCP_AO_CMDF_DEL_ASYNC (1 << 3) /* Asynchronious delete, valid
+ * only for listen sockets
+ */
#define TCP_AO_GET_CURR TCP_AO_CMDF_CURR
#define TCP_AO_GET_NEXT TCP_AO_CMDF_NEXT
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index a29c5bb8586b..46df1d455889 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -1503,7 +1503,7 @@ static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd,
#define TCP_AO_CMDF_ADDMOD_VALID \
(TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_ACCEPT_ICMP)
#define TCP_AO_CMDF_DEL_VALID \
- (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT)
+ (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_DEL_ASYNC)
#define TCP_AO_GETF_VALID \
(TCP_AO_GET_ALL | TCP_AO_GET_CURR | TCP_AO_GET_NEXT)
@@ -1629,11 +1629,26 @@ static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_key *key,
hlist_del_rcu(&key->node);
+ /* Support for async delete on listening sockets: as they don't
+ * need current_key/rnext_key maintaining, we don't need to check
+ * them and we can just free all resources in RCU fashion.
+ */
+ if (cmd->tcpa_flags & TCP_AO_CMDF_DEL_ASYNC) {
+ if (sk->sk_state != TCP_LISTEN)
+ return -EINVAL;
+ atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
+ call_rcu(&key->rcu, tcp_ao_key_free_rcu);
+ return 0;
+ }
+
/* At this moment another CPU could have looked this key up
* while it was unlinked from the list. Wait for RCU grace period,
* after which the key is off-list and can't be looked up again;
* the rx path [just before RCU came] might have used it and set it
* as current_key (very unlikely).
+ * Free the key with next RCU grace period (in case it was
+ * current_key before tcp_ao_current_rnext() might have
+ * changed it in forced-delete).
*/
synchronize_rcu();
err = tcp_ao_current_rnext(sk, cmd->tcpa_flags,
--
2.38.1
Similarly to TCP-MD5, add a static key to TCP-AO that is patched out
when there are no keys on a machine and dynamically enabled with the
first setsockopt(TCP_AO) adds a key on any socket. The static key is as
well dynamically disabled later when the socket is destructed.
The lifetime of enabled static key here is the same as ao_info: it is
enabled on allocation, passed over from full socket to twsk and
destructed when ao_info is scheduled for destruction.
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/net/tcp_ao.h | 2 ++
net/ipv4/tcp_ao.c | 15 +++++++++++++++
net/ipv4/tcp_input.c | 42 ++++++++++++++++++++++++++++--------------
3 files changed, 45 insertions(+), 14 deletions(-)
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 67f5273396ec..0923cd3b6b45 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -131,6 +131,8 @@ do { \
#ifdef CONFIG_TCP_AO
/* TCP-AO structures and functions */
+#include <linux/jump_label.h>
+extern struct static_key_false_deferred tcp_ao_needed;
struct tcp4_ao_context {
__be32 saddr;
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 46df1d455889..494fa5e1428c 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -17,6 +17,9 @@
#include <net/ipv6.h>
#include <net/icmp.h>
+DEFINE_STATIC_KEY_DEFERRED_FALSE(tcp_ao_needed, HZ);
+EXPORT_SYMBOL(tcp_ao_needed);
+
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len)
{
@@ -58,6 +61,9 @@ bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code)
struct tcp_ao_info *ao;
bool ignore_icmp = false;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return false;
+
/* RFC5925, 7.8:
* >> A TCP-AO implementation MUST default to ignore incoming ICMPv4
* messages of Type 3 (destination unreachable), Codes 2-4 (protocol
@@ -148,6 +154,9 @@ struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid)
struct tcp_ao_key *key;
struct tcp_ao_info *ao;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return NULL;
+
if (sk->sk_state == TCP_TIME_WAIT)
ao = rcu_dereference_check(tcp_twsk(sk)->ao_info,
lockdep_sock_is_held(sk));
@@ -232,6 +241,9 @@ struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
struct tcp_ao_key *key;
struct tcp_ao_info *ao;
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return NULL;
+
ao = rcu_dereference_check(tcp_sk(sk)->ao_info,
lockdep_sock_is_held(sk));
if (!ao)
@@ -319,6 +331,7 @@ void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
}
kfree_rcu(ao, rcu);
+ static_branch_slow_dec_deferred(&tcp_ao_needed);
}
void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp)
@@ -1078,6 +1091,7 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
sk_gso_disable(newsk);
rcu_assign_pointer(tcp_sk(newsk)->ao_info, new_ao);
+ atomic_inc(&tcp_ao_needed.key.key.enabled);
}
return 0;
@@ -1605,6 +1619,7 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family,
if (first) {
sk_gso_disable(sk);
rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info);
+ static_branch_inc(&tcp_ao_needed.key);
}
/* Can't fail: the key with sndid/rcvid was just added */
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2ba46d5db421..3f1f5c0e78ae 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3524,17 +3524,14 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp,
(ack_seq == tp->snd_wl1 && nwin > tp->snd_wnd);
}
-/* If we update tp->snd_una, also update tp->bytes_acked */
-static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
+static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack)
{
- u32 delta = ack - tp->snd_una;
#ifdef CONFIG_TCP_AO
struct tcp_ao_info *ao;
-#endif
- sock_owned_by_me((struct sock *)tp);
- tp->bytes_acked += delta;
-#ifdef CONFIG_TCP_AO
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return;
+
ao = rcu_dereference_protected(tp->ao_info,
lockdep_sock_is_held((struct sock *)tp));
if (ao) {
@@ -3543,20 +3540,27 @@ static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
ao->snd_sne_seq = ack;
}
#endif
+}
+
+/* If we update tp->snd_una, also update tp->bytes_acked */
+static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack)
+{
+ u32 delta = ack - tp->snd_una;
+
+ sock_owned_by_me((struct sock *)tp);
+ tp->bytes_acked += delta;
+ tcp_snd_sne_update(tp, ack);
tp->snd_una = ack;
}
-/* If we update tp->rcv_nxt, also update tp->bytes_received */
-static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq)
+static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq)
{
- u32 delta = seq - tp->rcv_nxt;
#ifdef CONFIG_TCP_AO
struct tcp_ao_info *ao;
-#endif
- sock_owned_by_me((struct sock *)tp);
- tp->bytes_received += delta;
-#ifdef CONFIG_TCP_AO
+ if (!static_branch_unlikely(&tcp_ao_needed.key))
+ return;
+
ao = rcu_dereference_protected(tp->ao_info,
lockdep_sock_is_held((struct sock *)tp));
if (ao) {
@@ -3565,6 +3569,16 @@ static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq)
ao->rcv_sne_seq = seq;
}
#endif
+}
+
+/* If we update tp->rcv_nxt, also update tp->bytes_received */
+static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq)
+{
+ u32 delta = seq - tp->rcv_nxt;
+
+ sock_owned_by_me((struct sock *)tp);
+ tp->bytes_received += delta;
+ tcp_rcv_sne_update(tp, seq);
WRITE_ONCE(tp->rcv_nxt, seq);
}
--
2.38.1
Now when the new request socket is created from the listening socket,
it's recorded what MKT was used by the peer. tcp_rsk_used_ao() is
a new helper for checking if TCP-AO option was used to create the
request socket.
tcp_ao_copy_all_matching() will copy all keys that match the peer on the
request socket, as well as preparing them for the usage (creating
traffic keys).
Co-developed-by: Francesco Ruggeri <[email protected]>
Signed-off-by: Francesco Ruggeri <[email protected]>
Co-developed-by: Salam Noureddine <[email protected]>
Signed-off-by: Salam Noureddine <[email protected]>
Signed-off-by: Dmitry Safonov <[email protected]>
---
include/linux/tcp.h | 18 ++++
include/net/tcp.h | 7 ++
include/net/tcp_ao.h | 22 +++++
net/ipv4/syncookies.c | 2 +
net/ipv4/tcp_ao.c | 187 +++++++++++++++++++++++++++++++++++++++
net/ipv4/tcp_input.c | 16 ++++
net/ipv4/tcp_ipv4.c | 63 +++++++++++--
net/ipv4/tcp_minisocks.c | 10 +++
net/ipv4/tcp_output.c | 36 +++++---
net/ipv6/syncookies.c | 2 +
net/ipv6/tcp_ao.c | 21 +++++
net/ipv6/tcp_ipv6.c | 78 +++++++++++++---
12 files changed, 433 insertions(+), 29 deletions(-)
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 6630a8195ea6..cbaf9ca25974 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -165,6 +165,11 @@ struct tcp_request_sock {
* after data-in-SYN.
*/
u8 syn_tos;
+#ifdef CONFIG_TCP_AO
+ u8 ao_keyid;
+ u8 ao_rcv_next;
+ u8 maclen;
+#endif
};
static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
@@ -172,6 +177,19 @@ static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
return (struct tcp_request_sock *)req;
}
+static inline bool tcp_rsk_used_ao(const struct request_sock *req)
+{
+ /* The real length of MAC is saved in the request socket,
+ * signing anything with zero-length makes no sense, so here is
+ * a little hack..
+ */
+#ifndef CONFIG_TCP_AO
+ return false;
+#else
+ return tcp_rsk(req)->maclen != 0;
+#endif
+}
+
struct tcp_sock {
/* inet_connection_sock has to be the first member of tcp_sock */
struct inet_connection_sock inet_conn;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index d2395ae7484c..bda03d4925ed 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2113,6 +2113,13 @@ struct tcp_request_sock_ops {
const struct sock *sk,
const struct sk_buff *skb);
#endif
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_key *(*ao_lookup)(const struct sock *sk,
+ struct request_sock *req,
+ int sndid, int rcvid);
+ int (*ao_calc_key)(struct tcp_ao_key *mkt, u8 *key,
+ struct request_sock *sk);
+#endif
#ifdef CONFIG_SYN_COOKIES
__u32 (*cookie_init_seq)(const struct sk_buff *skb,
__u16 *mss);
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index 9804881fd2bf..e93db866bd44 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -116,6 +116,9 @@ int tcp_ao_hash_skb(unsigned short int family,
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_ao_do_lookup_sndid(const struct sock *sk, u8 keyid);
+int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
+ struct request_sock *req, struct sk_buff *skb,
+ int family);
int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
unsigned int len);
void tcp_ao_destroy_sock(struct sock *sk, bool twsk);
@@ -139,6 +142,11 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk,
__be32 sisn, __be32 disn, bool send);
+int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
+ struct request_sock *req);
+struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk,
+ struct request_sock *req,
+ int sndid, int rcvid);
int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
@@ -149,9 +157,17 @@ int tcp_v6_ao_hash_pseudoheader(struct crypto_pool_ahash *hp,
int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
const struct sock *sk, __be32 sisn,
__be32 disn, bool send);
+int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
+ struct request_sock *req);
+struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk,
+ const struct in6_addr *addr,
+ int sndid, int rcvid);
struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
struct sock *addr_sk,
int sndid, int rcvid);
+struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk,
+ struct request_sock *req,
+ int sndid, int rcvid);
int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
const struct sock *sk, const struct sk_buff *skb,
const u8 *tkey, int hash_offset, u32 sne);
@@ -164,6 +180,12 @@ void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
unsigned short int family);
#else /* CONFIG_TCP_AO */
+static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
+ struct tcp_request_sock *treq,
+ unsigned short int family)
+{
+}
+
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
const union tcp_ao_addr *addr,
int family, int sndid, int rcvid, u16 port)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 942d2dfa1115..83801d7c5b02 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -395,6 +395,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
treq->snt_synack = 0;
treq->tfo_listener = false;
+ tcp_ao_syncookie(sk, skb, treq, AF_INET);
+
if (IS_ENABLED(CONFIG_SMC))
ireq->smc_ok = 0;
diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 09d5cee7c6d7..c9d3e29a28f1 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -52,6 +52,21 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
return 1;
}
+static struct tcp_ao_key *tcp_ao_do_lookup_keyid(struct tcp_ao_info *ao,
+ int sndid, int rcvid)
+{
+ struct tcp_ao_key *key;
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ if ((sndid >= 0 && key->sndid != sndid) ||
+ (rcvid >= 0 && key->rcvid != rcvid))
+ continue;
+ return key;
+ }
+
+ return NULL;
+}
+
static struct tcp_ao_key *tcp_ao_do_lookup_rcvid(struct sock *sk, u8 keyid)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -194,6 +209,23 @@ static void tcp_ao_link_mkt(struct tcp_ao_info *ao, struct tcp_ao_key *mkt)
hlist_add_head_rcu(&mkt->node, &ao->head);
}
+static struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk,
+ struct tcp_ao_key *key)
+{
+ struct tcp_ao_key *new_key;
+
+ new_key = sock_kmalloc(sk, tcp_ao_sizeof_key(key),
+ GFP_ATOMIC);
+ if (!new_key)
+ return NULL;
+
+ *new_key = *key;
+ INIT_HLIST_NODE(&new_key->node);
+ crypto_pool_add(new_key->crypto_pool_id);
+
+ return new_key;
+}
+
static void tcp_ao_key_free_rcu(struct rcu_head *head)
{
struct tcp_ao_key *key = container_of(head, struct tcp_ao_key, rcu);
@@ -291,6 +323,18 @@ int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
htons(sk->sk_num), disn, sisn);
}
+int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
+ struct request_sock *req)
+{
+ struct inet_request_sock *ireq = inet_rsk(req);
+
+ return tcp_v4_ao_calc_key(mkt, key,
+ ireq->ir_loc_addr, ireq->ir_rmt_addr,
+ htons(ireq->ir_num), ireq->ir_rmt_port,
+ htonl(tcp_rsk(req)->snt_isn),
+ htonl(tcp_rsk(req)->rcv_isn));
+}
+
static int tcp_v4_ao_hash_pseudoheader(struct crypto_pool_ahash *hp,
__be32 daddr, __be32 saddr,
int nbytes)
@@ -560,6 +604,16 @@ int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key,
tkey, hash_offset, sne);
}
+struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk,
+ struct request_sock *req,
+ int sndid, int rcvid)
+{
+ union tcp_ao_addr *addr =
+ (union tcp_ao_addr *)&inet_rsk(req)->ir_rmt_addr;
+
+ return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0);
+}
+
struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
int sndid, int rcvid)
{
@@ -568,6 +622,51 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk,
return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0);
}
+static struct tcp_ao_key *tcp_ao_inbound_lookup(unsigned short int family,
+ const struct sock *sk, const struct sk_buff *skb,
+ int sndid, int rcvid)
+{
+ if (family == AF_INET) {
+ const struct iphdr *iph = ip_hdr(skb);
+
+ return tcp_ao_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr,
+ AF_INET, sndid, rcvid, 0);
+ } else {
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ return tcp_ao_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr,
+ AF_INET6, sndid, rcvid, 0);
+ }
+}
+
+/* Returns maclen of requested key if found */
+void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
+ struct tcp_request_sock *treq,
+ unsigned short int family)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+ const struct tcp_ao_hdr *aoh;
+ struct tcp_ao_key *key;
+
+ treq->maclen = 0;
+
+ /* Shouldn't fail as this has been called on this packet
+ * in tcp_inbound_hash()
+ */
+ tcp_parse_auth_options(th, NULL, &aoh);
+ if (!aoh)
+ return;
+
+ key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid);
+ if (!key)
+ /* Key not found, continue without TCP-AO */
+ return;
+
+ treq->ao_rcv_next = aoh->keyid;
+ treq->ao_keyid = aoh->rnext_keyid;
+ treq->maclen = tcp_ao_maclen(key);
+}
+
int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao,
struct tcp_ao_key *ao_key)
{
@@ -665,6 +764,94 @@ void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
}
}
+int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
+ struct request_sock *req, struct sk_buff *skb,
+ int family)
+{
+ struct tcp_ao_info *ao;
+ struct tcp_ao_info *new_ao;
+ struct tcp_ao_key *key, *new_key, *first_key;
+ struct hlist_node *n;
+ union tcp_ao_addr *addr;
+ bool match = false;
+
+ ao = rcu_dereference(tcp_sk(sk)->ao_info);
+ if (!ao)
+ return 0;
+
+ /* New socket without TCP-AO on it */
+ if (!tcp_rsk_used_ao(req))
+ return 0;
+
+ new_ao = tcp_ao_alloc_info(GFP_ATOMIC, ao);
+ if (!new_ao)
+ return -ENOMEM;
+ new_ao->lisn = htonl(tcp_rsk(req)->snt_isn);
+ new_ao->risn = htonl(tcp_rsk(req)->rcv_isn);
+
+ if (family == AF_INET)
+ addr = (union tcp_ao_addr *)&newsk->sk_daddr;
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (family == AF_INET6)
+ addr = (union tcp_ao_addr *)&newsk->sk_v6_daddr;
+#endif
+ else
+ return -EOPNOTSUPP;
+
+ hlist_for_each_entry_rcu(key, &ao->head, node) {
+ if (tcp_ao_key_cmp(key, addr, key->prefixlen, family,
+ -1, -1, 0))
+ continue;
+
+ new_key = tcp_ao_copy_key(newsk, key);
+ if (!new_key)
+ goto free_and_exit;
+
+ tcp_ao_cache_traffic_keys(newsk, new_ao, new_key);
+ tcp_ao_link_mkt(new_ao, new_key);
+ match = true;
+ }
+
+ if (match) {
+ struct hlist_node *key_head;
+
+ key_head = rcu_dereference(hlist_first_rcu(&new_ao->head));
+ first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node);
+
+ /* set current_key */
+ key = tcp_ao_do_lookup_keyid(new_ao, tcp_rsk(req)->ao_keyid, -1);
+ if (key)
+ new_ao->current_key = key;
+ else
+ new_ao->current_key = first_key;
+
+ /* set rnext_key */
+ key = tcp_ao_do_lookup_keyid(new_ao, -1, tcp_rsk(req)->ao_rcv_next);
+ if (key)
+ new_ao->rnext_key = key;
+ else
+ new_ao->rnext_key = first_key;
+
+ new_ao->snd_sne_seq = tcp_rsk(req)->snt_isn;
+ new_ao->rcv_sne_seq = tcp_rsk(req)->rcv_isn;
+
+ sk_gso_disable(newsk);
+ rcu_assign_pointer(tcp_sk(newsk)->ao_info, new_ao);
+ }
+
+ return 0;
+
+free_and_exit:
+ hlist_for_each_entry_safe(key, n, &new_ao->head, node) {
+ hlist_del(&key->node);
+ crypto_pool_release(key->crypto_pool_id);
+ atomic_sub(tcp_ao_sizeof_key(key), &newsk->sk_omem_alloc);
+ kfree(key);
+ }
+ kfree(new_ao);
+ return -ENOMEM;
+}
+
static int tcp_ao_current_rnext(struct sock *sk, u16 tcpa_flags,
u8 tcpa_sndid, u8 tcpa_rcvid)
{
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a7c3823cd052..df3087c8179f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6935,6 +6935,10 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
struct flowi fl;
u8 syncookies;
+#ifdef CONFIG_TCP_AO
+ const struct tcp_ao_hdr *aoh;
+#endif
+
syncookies = READ_ONCE(net->ipv4.sysctl_tcp_syncookies);
/* TW buckets are converted to open requests without
@@ -7020,6 +7024,18 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
inet_rsk(req)->ecn_ok = 0;
}
+#ifdef CONFIG_TCP_AO
+ /* TODO: Add an option to require TCP-AO signature */
+ if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+ goto drop_and_release; /* Invalid TCP options */
+ if (aoh) {
+ tcp_rsk(req)->maclen = aoh->length - sizeof(struct tcp_ao_hdr);
+ tcp_rsk(req)->ao_rcv_next = aoh->keyid;
+ tcp_rsk(req)->ao_keyid = aoh->rnext_keyid;
+ } else {
+ tcp_rsk(req)->maclen = 0;
+ }
+#endif
tcp_rsk(req)->snt_isn = isn;
tcp_rsk(req)->txhash = net_tx_rndhash();
tcp_rsk(req)->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index fcf61b5bc581..47325f148f29 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1088,30 +1088,73 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
+ struct tcp_md5sig_key *md5_key = NULL;
+ struct tcp_ao_key *ao_key = NULL;
const union tcp_md5_addr *addr;
- int l3index;
+ u8 keyid = 0;
+#ifdef CONFIG_TCP_AO
+ u8 traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+ const struct tcp_ao_hdr *aoh;
+#else
+ u8 *traffic_key = NULL;
+#endif
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
*/
u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 :
tcp_sk(sk)->snd_nxt;
+ addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
+
+ if (tcp_rsk_used_ao(req)) {
+#ifdef CONFIG_TCP_AO
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+ return;
+
+ if (!aoh)
+ return;
+
+ ao_key = tcp_ao_do_lookup(sk, addr, AF_INET,
+ aoh->rnext_keyid, -1, 0);
+ if (unlikely(!ao_key)) {
+ /* Send ACK with any matching MKT for the peer */
+ ao_key = tcp_ao_do_lookup(sk, addr,
+ AF_INET, -1, -1, 0);
+ /* Matching key disappeared (user removed the key?)
+ * let the handshake timeout.
+ */
+ if (!ao_key) {
+ net_info_ratelimited("TCP-AO key for (%pI4, %d)->(%pI4, %d) suddenly disappeared, won't ACK new connection\n",
+ addr,
+ ntohs(tcp_hdr(skb)->source),
+ &ip_hdr(skb)->daddr,
+ ntohs(tcp_hdr(skb)->dest));
+ return;
+ }
+ }
+ keyid = aoh->keyid;
+ tcp_v4_ao_calc_key_rsk(ao_key, traffic_key, req);
+#endif
+ } else {
+ int l3index;
+
+ l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
+ md5_key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
+ }
/* RFC 7323 2.3
* The window field (SEG.WND) of every outgoing segment, with the
* exception of <SYN> segments, MUST be right-shifted by
* Rcv.Wind.Shift bits:
*/
- addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
- l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
tcp_v4_send_ack(sk, skb, seq,
tcp_rsk(req)->rcv_nxt,
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
req->ts_recent,
0,
- tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
- NULL, NULL, 0, 0,
+ md5_key, ao_key, traffic_key, keyid, 0,
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
ip_hdr(skb)->tos);
}
@@ -1632,6 +1675,10 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
.req_md5_lookup = tcp_v4_md5_lookup,
.calc_md5_hash = tcp_v4_md5_hash_skb,
#endif
+#ifdef CONFIG_TCP_AO
+ .ao_lookup = tcp_v4_ao_lookup_rsk,
+ .ao_calc_key = tcp_v4_ao_calc_key_rsk,
+#endif
#ifdef CONFIG_SYN_COOKIES
.cookie_init_seq = cookie_v4_init_sequence,
#endif
@@ -1733,7 +1780,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
/* Copy over the MD5 key from the original socket */
addr = (union tcp_md5_addr *)&newinet->inet_daddr;
key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
- if (key) {
+ if (key && !tcp_rsk_used_ao(req)) {
/*
* We're using one, so create a matching key
* on the newsk structure. If we fail to get
@@ -1744,6 +1791,10 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
sk_gso_disable(newsk);
}
#endif
+#ifdef CONFIG_TCP_AO
+ if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET))
+ goto put_and_exit; /* OOM, release back memory */
+#endif
if (__inet_inherit_port(sk, newsk) < 0)
goto put_and_exit;
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 87cf3073b6c2..8de62d76c663 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -494,6 +494,9 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
struct inet_connection_sock *newicsk;
struct tcp_sock *oldtp, *newtp;
u32 seq;
+#ifdef CONFIG_TCP_AO
+ struct tcp_ao_key *ao_key;
+#endif
if (!newsk)
return NULL;
@@ -572,6 +575,13 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
if (treq->af_specific->req_md5_lookup(sk, req_to_sk(req)))
newtp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
+#ifdef CONFIG_TCP_AO
+ newtp->ao_info = NULL;
+ ao_key = treq->af_specific->ao_lookup(sk, req,
+ tcp_rsk(req)->ao_keyid, -1);
+ if (ao_key)
+ newtp->tcp_header_len += tcp_ao_len(ao_key);
+ #endif
if (skb->len >= TCP_MSS_DEFAULT + newtp->tcp_header_len)
newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
newtp->rx_opt.mss_clamp = req->mss;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 3aea90605034..758c4a6e851b 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -606,6 +606,7 @@ static void bpf_skops_write_hdr_opt(struct sock *sk, struct sk_buff *skb,
* (but it may well be that other scenarios fail similarly).
*/
static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp,
+ const struct tcp_request_sock *tcprsk,
struct tcp_out_options *opts,
struct tcp_ao_key *ao_key)
{
@@ -620,19 +621,32 @@ static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp,
ptr += 4;
}
#ifdef CONFIG_TCP_AO
- if (unlikely(OPTION_AO & options) && tp) {
- struct tcp_ao_info *ao_info;
+ if (unlikely(OPTION_AO & options)) {
u8 maclen;
- ao_info = rcu_dereference_check(tp->ao_info,
+ if (tp) {
+ struct tcp_ao_info *ao_info;
+
+ ao_info = rcu_dereference_check(tp->ao_info,
lockdep_sock_is_held(&tp->inet_conn.icsk_inet.sk));
- if (WARN_ON_ONCE(!ao_key || !ao_info || !ao_info->rnext_key))
+ if (WARN_ON_ONCE(!ao_key || !ao_info || !ao_info->rnext_key))
+ goto out_ao;
+ maclen = tcp_ao_maclen(ao_key);
+ *ptr++ = htonl((TCPOPT_AO << 24) |
+ (tcp_ao_len(ao_key) << 16) |
+ (ao_key->sndid << 8) |
+ (ao_info->rnext_key->rcvid));
+ } else if (tcprsk) {
+ u8 aolen = tcprsk->maclen + sizeof(struct tcp_ao_hdr);
+
+ maclen = tcprsk->maclen;
+ *ptr++ = htonl((TCPOPT_AO << 24) | (aolen << 16) |
+ (tcprsk->ao_keyid << 8) |
+ (tcprsk->ao_rcv_next));
+ } else {
+ WARN_ON_ONCE(1);
goto out_ao;
- maclen = tcp_ao_maclen(ao_key);
- *ptr++ = htonl((TCPOPT_AO << 24) |
- (tcp_ao_len(ao_key) << 16) |
- (ao_key->sndid << 8) |
- (ao_info->rnext_key->rcvid));
+ }
opts->hash_location = (__u8 *)ptr;
ptr += maclen / sizeof(*ptr);
if (unlikely(maclen % sizeof(*ptr))) {
@@ -1411,7 +1425,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
th->window = htons(min(tp->rcv_wnd, 65535U));
}
- tcp_options_write(th, tp, &opts, ao_key);
+ tcp_options_write(th, tp, NULL, &opts, ao_key);
#ifdef CONFIG_TCP_MD5SIG
/* Calculate the MD5 hash, as we have all we need now */
@@ -3702,7 +3716,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst,
/* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */
th->window = htons(min(req->rsk_rcv_wnd, 65535U));
- tcp_options_write(th, NULL, &opts, NULL);
+ tcp_options_write(th, NULL, NULL, &opts, NULL);
th->doff = (tcp_header_size >> 2);
__TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS);
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 5014aa663452..ad7a8caa7b2a 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -214,6 +214,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
treq->snt_isn = cookie;
treq->ts_off = 0;
treq->txhash = net_tx_rndhash();
+ tcp_ao_syncookie(sk, skb, treq, AF_INET6);
+
if (IS_ENABLED(CONFIG_SMC))
ireq->smc_ok = 0;
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c
index 7fd31c60488a..31ae504af8e6 100644
--- a/net/ipv6/tcp_ao.c
+++ b/net/ipv6/tcp_ao.c
@@ -53,6 +53,18 @@ int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key,
htons(sk->sk_num), disn, sisn);
}
+int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key,
+ struct request_sock *req)
+{
+ struct inet_request_sock *ireq = inet_rsk(req);
+
+ return tcp_v6_ao_calc_key(mkt, key,
+ &ireq->ir_v6_loc_addr, &ireq->ir_v6_rmt_addr,
+ htons(ireq->ir_num), ireq->ir_rmt_port,
+ htonl(tcp_rsk(req)->snt_isn),
+ htonl(tcp_rsk(req)->rcv_isn));
+}
+
struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk,
const struct in6_addr *addr,
int sndid, int rcvid)
@@ -70,6 +82,15 @@ struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk,
return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid);
}
+struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk,
+ struct request_sock *req,
+ int sndid, int rcvid)
+{
+ struct in6_addr *addr = &inet_rsk(req)->ir_v6_rmt_addr;
+
+ return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid);
+}
+
int tcp_v6_ao_hash_pseudoheader(struct crypto_pool_ahash *hp,
const struct in6_addr *daddr,
const struct in6_addr *saddr, int nbytes)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7bd4d0bb77cd..88a8e6ce41dc 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -853,6 +853,10 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
.req_md5_lookup = tcp_v6_md5_lookup,
.calc_md5_hash = tcp_v6_md5_hash_skb,
#endif
+#ifdef CONFIG_TCP_AO
+ .ao_lookup = tcp_v6_ao_lookup_rsk,
+ .ao_calc_key = tcp_v6_ao_calc_key_rsk,
+#endif
#ifdef CONFIG_SYN_COOKIES
.cookie_init_seq = cookie_v6_init_sequence,
#endif
@@ -1237,9 +1241,51 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
+ struct tcp_md5sig_key *md5_key = NULL;
+ struct tcp_ao_key *ao_key = NULL;
+ const struct in6_addr *addr;
+ u8 keyid = 0;
+#ifdef CONFIG_TCP_AO
+ char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
+ const struct tcp_ao_hdr *aoh;
+#else
+ u8 *traffic_key = NULL;
+#endif
int l3index;
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
+ addr = &ipv6_hdr(skb)->saddr;
+
+ if (tcp_rsk_used_ao(req)) {
+#ifdef CONFIG_TCP_AO
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
+ return;
+ if (!aoh)
+ return;
+ ao_key = tcp_v6_ao_do_lookup(sk, addr, aoh->rnext_keyid, -1);
+ if (unlikely(!ao_key)) {
+ /* Send ACK with any matching MKT for the peer */
+ ao_key = tcp_v6_ao_do_lookup(sk, addr, -1, -1);
+ /* Matching key disappeared (user removed the key?)
+ * let the handshake timeout.
+ */
+ if (!ao_key) {
+ net_info_ratelimited("TCP-AO key for (%pI6, %d)->(%pI6, %d) suddenly disappeared, won't ACK new connection\n",
+ addr,
+ ntohs(tcp_hdr(skb)->source),
+ &ipv6_hdr(skb)->daddr,
+ ntohs(tcp_hdr(skb)->dest));
+ return;
+ }
+ }
+
+ keyid = aoh->keyid;
+ tcp_v6_ao_calc_key_rsk(ao_key, traffic_key, req);
+#endif
+ } else {
+ md5_key = tcp_v6_md5_do_lookup(sk, addr, l3index);
+ }
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
@@ -1255,9 +1301,9 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
req->ts_recent, sk->sk_bound_dev_if,
- tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
+ md5_key,
ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority,
- tcp_rsk(req)->txhash, NULL, NULL, 0, 0);
+ tcp_rsk(req)->txhash, ao_key, traffic_key, keyid, 0);
}
@@ -1487,18 +1533,26 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
#ifdef CONFIG_TCP_MD5SIG
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
- /* Copy over the MD5 key from the original socket */
- key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index);
- if (key) {
- /* We're using one, so create a matching key
- * on the newsk structure. If we fail to get
- * memory, then we end up not copying the key
- * across. Shucks.
- */
- tcp_md5_key_copy(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
- AF_INET6, 128, l3index, key);
+ if (!tcp_rsk_used_ao(req)) {
+ const struct in6_addr *daddr = &newsk->sk_v6_daddr;
+ /* Copy over the MD5 key from the original socket */
+ key = tcp_v6_md5_do_lookup(sk, daddr, l3index);
+ if (key) {
+ /* We're using one, so create a matching key
+ * on the newsk structure. If we fail to get
+ * memory, then we end up not copying the key
+ * across. Shucks.
+ */
+ tcp_md5_key_copy(newsk, (union tcp_md5_addr *)daddr,
+ AF_INET6, 128, l3index, key);
+ }
}
#endif
+#ifdef CONFIG_TCP_AO
+ /* Copy over tcp_ao_info if any */
+ if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET6))
+ goto out; /* OOM */
+#endif
if (__inet_inherit_port(sk, newsk) < 0) {
inet_csk_prepare_forced_close(newsk);
--
2.38.1
Provide functions to create selftests dedicated to TCP-AO.
They can run in parallel, as they use temporary net namespaces.
They can be very specific to the feature being tested.
This will allow to create a lot of TCP-AO tests, without complicating
one binary with many --options and to create scenarios, that are
hard to put in bash script that uses one binary.
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/net/tcp_ao/.gitignore | 2 +
tools/testing/selftests/net/tcp_ao/Makefile | 45 +++
tools/testing/selftests/net/tcp_ao/connect.c | 81 +++++
.../testing/selftests/net/tcp_ao/lib/aolib.h | 336 +++++++++++++++++
.../selftests/net/tcp_ao/lib/netlink.c | 341 +++++++++++++++++
tools/testing/selftests/net/tcp_ao/lib/proc.c | 267 ++++++++++++++
.../testing/selftests/net/tcp_ao/lib/setup.c | 343 ++++++++++++++++++
tools/testing/selftests/net/tcp_ao/lib/sock.c | 294 +++++++++++++++
.../testing/selftests/net/tcp_ao/lib/utils.c | 30 ++
10 files changed, 1740 insertions(+)
create mode 100644 tools/testing/selftests/net/tcp_ao/.gitignore
create mode 100644 tools/testing/selftests/net/tcp_ao/Makefile
create mode 100644 tools/testing/selftests/net/tcp_ao/connect.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/aolib.h
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/netlink.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/proc.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/setup.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/sock.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/utils.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 0464b2c6c1e4..8dc5941de83d 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -49,6 +49,7 @@ TARGETS += net
TARGETS += net/af_unix
TARGETS += net/forwarding
TARGETS += net/mptcp
+TARGETS += net/tcp_ao
TARGETS += netfilter
TARGETS += nsfs
TARGETS += pidfd
diff --git a/tools/testing/selftests/net/tcp_ao/.gitignore b/tools/testing/selftests/net/tcp_ao/.gitignore
new file mode 100644
index 000000000000..e8bb81b715b7
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/.gitignore
@@ -0,0 +1,2 @@
+*_ipv4
+*_ipv6
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
new file mode 100644
index 000000000000..cb23d67944d7
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0
+TEST_BOTH_AF := connect
+
+TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
+TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
+
+TEST_GEN_PROGS := $(TEST_IPV4_PROGS) $(TEST_IPV6_PROGS)
+
+top_srcdir := ../../../../..
+KSFT_KHDR_INSTALL := 1
+include ../../lib.mk
+
+HOSTAR ?= ar
+
+# Drop it on port to linux/master with commit 8ce72dc32578
+.DEFAULT_GOAL := all
+
+LIBDIR := $(OUTPUT)/lib
+LIB := $(LIBDIR)/libaotst.a
+LDLIBS += $(LIB) -pthread
+LIBDEPS := lib/aolib.h Makefile
+
+CFLAGS := -Wall -O2 -g -D_GNU_SOURCE -fno-strict-aliasing
+CFLAGS += -I ../../../../../usr/include/ -iquote $(LIBDIR)
+CFLAGS += -I ../../../../include/
+
+# Library
+LIBSRC := setup.c netlink.c utils.c sock.c proc.c
+LIBOBJ := $(LIBSRC:%.c=$(LIBDIR)/%.o)
+EXTRA_CLEAN += $(LIBOBJ) $(LIB)
+
+$(LIB): $(LIBOBJ)
+ $(HOSTAR) rcs $@ $^
+
+$(LIBDIR)/%.o: ./lib/%.c $(LIBDEPS)
+ $(CC) $< $(CFLAGS) $(CPPFLAGS) -o $@ -c
+
+$(TEST_GEN_PROGS): $(LIB)
+
+$(OUTPUT)/%_ipv4: %.c
+ $(LINK.c) $^ $(LDLIBS) -o $@
+
+$(OUTPUT)/%_ipv6: %.c
+ $(LINK.c) -DIPV6_TEST $^ $(LDLIBS) -o $@
+
diff --git a/tools/testing/selftests/net/tcp_ao/connect.c b/tools/testing/selftests/net/tcp_ao/connect.c
new file mode 100644
index 000000000000..02aa50f0266c
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/connect.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dmitry Safonov <[email protected]> */
+#include <inttypes.h>
+#include "aolib.h"
+
+static void *server_fn(void *arg)
+{
+ int err, sk, lsk;
+ ssize_t bytes;
+
+ lsk = test_listen_socket(this_ip_addr, test_server_port, 1);
+
+ if (test_set_ao(lsk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+ synchronize_threads();
+
+ err = test_wait_fd(lsk, TEST_TIMEOUT_SEC, 0);
+ if (!err)
+ test_error("timeouted for accept()");
+ else if (err < 0)
+ test_error("test_wait_fd()");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0)
+ test_error("accept()");
+
+ synchronize_threads();
+
+ bytes = test_server_run(sk, 0, 0);
+
+ test_fail("server served: %zd", bytes);
+ return NULL;
+}
+
+static void *client_fn(void *arg)
+{
+ int sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ uint64_t before_aogood, after_aogood;
+ const size_t nr_packets = 20;
+ struct netstat *ns_before, *ns_after;
+
+ if (sk < 0)
+ test_error("socket()");
+
+ if (test_set_ao(sk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads();
+ if (test_connect_socket(sk, this_ip_dest, test_server_port) <= 0)
+ test_error("failed to connect()");
+ synchronize_threads();
+
+ ns_before = netstat_read();
+ before_aogood = netstat_get(ns_before, "TCPAOGood", NULL);
+ if (test_client_verify(sk, 100, nr_packets, TEST_TIMEOUT_SEC)) {
+ test_fail("verify failed");
+ return NULL;
+ }
+
+ ns_after = netstat_read();
+ after_aogood = netstat_get(ns_after, "TCPAOGood", NULL);
+ netstat_print_diff(ns_before, ns_after);
+ netstat_free(ns_before);
+ netstat_free(ns_after);
+
+ if (nr_packets > (after_aogood - before_aogood)) {
+ test_fail("TCPAOGood counter mismatch: %zu > (%zu - %zu)",
+ nr_packets, after_aogood, before_aogood);
+ return NULL;
+ }
+
+ test_ok("connect TCPAOGood %" PRIu64 " => %" PRIu64 ", sent %" PRIu64,
+ before_aogood, after_aogood, nr_packets);
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(1, server_fn, client_fn);
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/aolib.h b/tools/testing/selftests/net/tcp_ao/lib/aolib.h
new file mode 100644
index 000000000000..308b32b3d5fe
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/aolib.h
@@ -0,0 +1,336 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * TCP-AO selftest library. Provides helpers to unshare network
+ * namespaces, create veth, assign ip addresses, set routes,
+ * manipulate socket options, read network counter and etc.
+ * Author: Dmitry Safonov <[email protected]>
+ */
+#ifndef _AOLIB_H_
+#define _AOLIB_H_
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/snmp.h>
+#include <linux/tcp.h>
+#include <netinet/in.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include "../../../../../include/linux/stringify.h"
+
+/* Working around ksft, see the comment in lib/setup.c */
+extern void __test_msg(const char *buf);
+extern void __test_ok(const char *buf);
+extern void __test_fail(const char *buf);
+extern void __test_error(const char *buf);
+extern void __test_skip(const char *buf);
+
+__attribute__((__format__(__printf__, 2, 3)))
+static inline void __test_print(void (*fn)(const char *), const char *fmt, ...)
+{
+#define TEST_MSG_BUFFER_SIZE 4096
+ char buf[TEST_MSG_BUFFER_SIZE];
+ va_list arg;
+
+ va_start(arg, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, arg);
+ va_end(arg);
+ fn(buf);
+}
+
+#define test_print(fmt, ...) \
+ __test_print(__test_msg, "%ld[%s:%u] " fmt "\n", \
+ syscall(SYS_gettid), \
+ __FILE__, __LINE__, ##__VA_ARGS__)
+
+#define test_ok(fmt, ...) \
+ __test_print(__test_ok, fmt "\n", ##__VA_ARGS__)
+#define test_skip(fmt, ...) \
+ __test_print(__test_skip, fmt "\n", ##__VA_ARGS__)
+
+#define test_fail(fmt, ...) \
+do { \
+ if (errno) \
+ __test_print(__test_fail, fmt ": %m\n", ##__VA_ARGS__); \
+ else \
+ __test_print(__test_fail, fmt "\n", ##__VA_ARGS__); \
+ test_failed(); \
+} while (0)
+
+#define KSFT_FAIL 1
+#define test_error(fmt, ...) \
+do { \
+ if (errno) \
+ __test_print(__test_error, "%ld[%s:%u] " fmt ": %m\n", \
+ syscall(SYS_gettid), __FILE__, __LINE__, \
+ ##__VA_ARGS__); \
+ else \
+ __test_print(__test_error, "%ld[%s:%u] " fmt "\n", \
+ syscall(SYS_gettid), __FILE__, __LINE__, \
+ ##__VA_ARGS__); \
+ exit(KSFT_FAIL); \
+} while (0)
+
+union tcp_addr {
+ struct in_addr a4;
+ struct in6_addr a6;
+};
+
+typedef void *(*thread_fn)(void *);
+extern void test_failed(void);
+extern void __test_init(unsigned int ntests, int family, unsigned int prefix,
+ union tcp_addr addr1, union tcp_addr addr2,
+ thread_fn peer1, thread_fn peer2);
+
+static inline void test_init2(unsigned int ntests,
+ thread_fn peer1, thread_fn peer2,
+ int family, unsigned int prefix,
+ const char *addr1, const char *addr2)
+{
+ union tcp_addr taddr1, taddr2;
+
+ if (inet_pton(family, addr1, &taddr1) != 1)
+ test_error("Can't convert ip address %s", addr1);
+ if (inet_pton(family, addr2, &taddr2) != 1)
+ test_error("Can't convert ip address %s", addr2);
+
+ __test_init(ntests, family, prefix, taddr1, taddr2, peer1, peer2);
+}
+extern void test_add_destructor(void (*d)(void));
+extern void test_set_optmem(size_t value);
+
+extern const struct sockaddr_in6 addr_any6;
+extern const struct sockaddr_in addr_any4;
+
+#ifdef IPV6_TEST
+# define __TEST_CLIENT_IP(n) ("2001:db8:" __stringify(n) "::1")
+# define TEST_CLIENT_IP __TEST_CLIENT_IP(1)
+# define TEST_WRONG_IP "2001:db8:253::1"
+# define TEST_SERVER_IP "2001:db8:254::1"
+# define TEST_NETWORK "2001::"
+# define TEST_PREFIX 128
+# define TEST_FAMILY AF_INET6
+# define SOCKADDR_ANY addr_any6
+#else
+# define __TEST_CLIENT_IP(n) ("10.0." __stringify(n) ".1")
+# define TEST_CLIENT_IP __TEST_CLIENT_IP(1)
+# define TEST_WRONG_IP "10.0.253.1"
+# define TEST_SERVER_IP "10.0.254.1"
+# define TEST_NETWORK "10.0.0.0"
+# define TEST_PREFIX 32
+# define TEST_FAMILY AF_INET
+# define SOCKADDR_ANY addr_any4
+#endif
+
+static inline void test_init(unsigned int ntests,
+ thread_fn peer1, thread_fn peer2)
+{
+ test_init2(ntests, peer1, peer2, TEST_FAMILY, TEST_PREFIX,
+ TEST_SERVER_IP, TEST_CLIENT_IP);
+}
+extern void synchronize_threads(void);
+extern void switch_ns(int fd);
+
+extern __thread union tcp_addr this_ip_addr;
+extern __thread union tcp_addr this_ip_dest;
+extern int test_family;
+
+extern void randomize_buffer(void *buf, size_t buflen);
+extern const char veth_name[];
+extern int add_veth(const char *name, int nsfda, int nsfdb);
+extern int ip_addr_add(const char *intf, int family,
+ union tcp_addr addr, uint8_t prefix);
+extern int ip_route_add(const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst);
+extern int link_set_up(const char *intf);
+
+extern const unsigned int test_server_port;
+extern int test_wait_fd(int sk, time_t sec, bool write);
+extern int __test_connect_socket(int sk, void *addr, size_t addr_sz,
+ time_t timeout);
+extern int __test_listen_socket(int backlog, void *addr, size_t addr_sz);
+
+static inline int test_listen_socket(const union tcp_addr taddr,
+ unsigned int port, int backlog)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = htons(port),
+ .sin6_addr = taddr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = htons(port),
+ .sin_addr = taddr.a4,
+ };
+#endif
+ return __test_listen_socket(backlog, (void *)&addr, sizeof(addr));
+}
+
+#ifndef DEFAULT_TEST_ALGO
+#define DEFAULT_TEST_ALGO "cmac(aes128)"
+#endif
+
+#ifdef IPV6_TEST
+#define DEFAULT_TEST_PREFIX 128
+#else
+#define DEFAULT_TEST_PREFIX 32
+#endif
+
+/*
+ * Timeout on syscalls where failure is not expected.
+ * You may want to rise it if the test machine is very busy.
+ */
+#ifndef TEST_TIMEOUT_SEC
+#define TEST_TIMEOUT_SEC 5
+#endif
+
+/*
+ * Timeout on connect() where a failure is expected.
+ * If set to 0 - kernel will try to retransmit SYN number of times, set in
+ * /proc/sys/net/ipv4/tcp_syn_retries
+ * By default set to 1 to make tests pass faster on non-busy machine.
+ */
+#ifndef TEST_RETRANSMIT_SEC
+#define TEST_RETRANSMIT_SEC 1
+#endif
+
+
+static inline int _test_connect_socket(int sk, const union tcp_addr taddr,
+ unsigned int port, time_t timeout)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = htons(port),
+ .sin6_addr = taddr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = htons(port),
+ .sin_addr = taddr.a4,
+ };
+#endif
+ return __test_connect_socket(sk, (void *)&addr, sizeof(addr), timeout);
+}
+
+static inline int test_connect_socket(int sk, const union tcp_addr taddr,
+ unsigned int port)
+{
+ return _test_connect_socket(sk, taddr, port, TEST_TIMEOUT_SEC);
+}
+
+extern int test_prepare_ao_sockaddr(struct tcp_ao *ao,
+ const char *alg, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key);
+
+static inline int test_prepare_ao(struct tcp_ao *ao,
+ const char *alg, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = in_addr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = in_addr.a4,
+ };
+#endif
+
+ return test_prepare_ao_sockaddr(ao, alg, flags,
+ (void *)&addr, sizeof(addr), prefix, sndid, rcvid,
+ maclen, keyflags, keylen, key);
+}
+
+static inline int test_prepare_def_ao(struct tcp_ao *ao,
+ const char *key, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ if (prefix > DEFAULT_TEST_PREFIX)
+ prefix = DEFAULT_TEST_PREFIX;
+
+ return test_prepare_ao(ao, DEFAULT_TEST_ALGO, flags, in_addr,
+ prefix, sndid, rcvid, 0, 0, strlen(key), key);
+}
+
+extern int test_get_one_ao(int sk, struct tcp_ao_getsockopt *out,
+ uint16_t flags, void *addr, size_t addr_sz,
+ uint8_t prefix, uint8_t sndid, uint8_t rcvid);
+extern int test_cmp_getsockopt_setsockopt(const struct tcp_ao *a,
+ const struct tcp_ao_getsockopt *b);
+
+static inline int test_verify_socket_ao(int sk, struct tcp_ao *ao)
+{
+ struct tcp_ao_getsockopt tmp;
+ int err;
+
+ err = test_get_one_ao(sk, &tmp, 0, &ao->tcpa_addr,
+ sizeof(ao->tcpa_addr), ao->tcpa_prefix,
+ ao->tcpa_sndid, ao->tcpa_rcvid);
+ if (err)
+ return err;
+
+ return test_cmp_getsockopt_setsockopt(ao, &tmp);
+}
+
+static inline int test_set_ao(int sk, const char *key, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ struct tcp_ao tmp;
+ int err;
+
+ err = test_prepare_def_ao(&tmp, key, flags, in_addr,
+ prefix, sndid, rcvid);
+ if (err)
+ return err;
+
+ if (setsockopt(sk, IPPROTO_TCP, TCP_AO, &tmp, sizeof(tmp)) < 0)
+ return -errno;
+
+ return test_verify_socket_ao(sk, &tmp);
+}
+
+extern ssize_t test_server_run(int sk, ssize_t quota, time_t timeout_sec);
+extern ssize_t test_client_loop(int sk, char *buf, size_t buf_sz,
+ const size_t msg_len, time_t timeout_sec);
+extern int test_client_verify(int sk, const size_t msg_len, const size_t nr,
+ time_t timeout_sec);
+
+struct netstat;
+extern struct netstat *netstat_read(void);
+extern void netstat_free(struct netstat *ns);
+extern void netstat_print_diff(struct netstat *nsa, struct netstat *nsb);
+extern uint64_t netstat_get(struct netstat *ns,
+ const char *name, bool *not_found);
+
+static inline uint64_t netstat_get_one(const char *name, bool *not_found)
+{
+ struct netstat *ns = netstat_read();
+ uint64_t ret;
+
+ ret = netstat_get(ns, name, not_found);
+
+ netstat_free(ns);
+ return ret;
+}
+
+#endif /* _AOLIB_H_ */
diff --git a/tools/testing/selftests/net/tcp_ao/lib/netlink.c b/tools/testing/selftests/net/tcp_ao/lib/netlink.c
new file mode 100644
index 000000000000..e6ad828f58dc
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/netlink.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Original from tools/testing/selftests/net/ipsec.c */
+#include <linux/netlink.h>
+#include <linux/random.h>
+#include <linux/rtnetlink.h>
+#include <linux/veth.h>
+#include <net/if.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/socket.h>
+
+#include "aolib.h"
+
+#define MAX_PAYLOAD 2048
+
+static int netlink_sock(int *sock, uint32_t *seq_nr, int proto)
+{
+ if (*sock > 0) {
+ seq_nr++;
+ return 0;
+ }
+
+ *sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, proto);
+ if (*sock <= 0) {
+ test_print("socket(AF_NETLINK)");
+ return -1;
+ }
+
+ randomize_buffer(seq_nr, sizeof(*seq_nr));
+
+ return 0;
+}
+
+static int netlink_check_answer(int sock, bool quite)
+{
+ struct nlmsgerror {
+ struct nlmsghdr hdr;
+ int error;
+ struct nlmsghdr orig_msg;
+ } answer;
+
+ if (recv(sock, &answer, sizeof(answer), 0) < 0) {
+ test_print("recv()");
+ return -1;
+ } else if (answer.hdr.nlmsg_type != NLMSG_ERROR) {
+ test_print("expected NLMSG_ERROR, got %d",
+ (int)answer.hdr.nlmsg_type);
+ return -1;
+ } else if (answer.error) {
+ if (!quite) {
+ test_print("NLMSG_ERROR: %d: %s",
+ answer.error, strerror(-answer.error));
+ }
+ return answer.error;
+ }
+
+ return 0;
+}
+
+static inline struct rtattr *rtattr_hdr(struct nlmsghdr *nh)
+{
+ return (struct rtattr *)((char *)(nh) + RTA_ALIGN((nh)->nlmsg_len));
+}
+
+static int rtattr_pack(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type, const void *payload, size_t size)
+{
+ /* NLMSG_ALIGNTO == RTA_ALIGNTO, nlmsg_len already aligned */
+ struct rtattr *attr = rtattr_hdr(nh);
+ size_t nl_size = RTA_ALIGN(nh->nlmsg_len) + RTA_LENGTH(size);
+
+ if (req_sz < nl_size) {
+ test_print("req buf is too small: %zu < %zu", req_sz, nl_size);
+ return -1;
+ }
+ nh->nlmsg_len = nl_size;
+
+ attr->rta_len = RTA_LENGTH(size);
+ attr->rta_type = rta_type;
+ memcpy(RTA_DATA(attr), payload, size);
+
+ return 0;
+}
+
+static struct rtattr *_rtattr_begin(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type, const void *payload, size_t size)
+{
+ struct rtattr *ret = rtattr_hdr(nh);
+
+ if (rtattr_pack(nh, req_sz, rta_type, payload, size))
+ return 0;
+
+ return ret;
+}
+
+static inline struct rtattr *rtattr_begin(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type)
+{
+ return _rtattr_begin(nh, req_sz, rta_type, 0, 0);
+}
+
+static inline void rtattr_end(struct nlmsghdr *nh, struct rtattr *attr)
+{
+ char *nlmsg_end = (char *)nh + nh->nlmsg_len;
+
+ attr->rta_len = nlmsg_end - (char *)attr;
+}
+
+static int veth_pack_peerb(struct nlmsghdr *nh, size_t req_sz,
+ const char *peer, int ns)
+{
+ struct ifinfomsg pi;
+ struct rtattr *peer_attr;
+
+ memset(&pi, 0, sizeof(pi));
+ pi.ifi_family = AF_UNSPEC;
+ pi.ifi_change = 0xFFFFFFFF;
+
+ peer_attr = _rtattr_begin(nh, req_sz, VETH_INFO_PEER, &pi, sizeof(pi));
+ if (!peer_attr)
+ return -1;
+
+ if (rtattr_pack(nh, req_sz, IFLA_IFNAME, peer, strlen(peer)))
+ return -1;
+
+ if (rtattr_pack(nh, req_sz, IFLA_NET_NS_FD, &ns, sizeof(ns)))
+ return -1;
+
+ rtattr_end(nh, peer_attr);
+
+ return 0;
+}
+
+static int __add_veth(int sock, uint32_t seq, const char *name,
+ int ns_a, int ns_b)
+{
+ uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ static const char veth_type[] = "veth";
+ struct rtattr *link_info, *info_data;
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWLINK;
+ req.nh.nlmsg_flags = flags;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifi_family = AF_UNSPEC;
+ req.info.ifi_change = 0xFFFFFFFF;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_IFNAME, name, strlen(name)))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_NET_NS_FD, &ns_a, sizeof(ns_a)))
+ return -1;
+
+ link_info = rtattr_begin(&req.nh, sizeof(req), IFLA_LINKINFO);
+ if (!link_info)
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_INFO_KIND, veth_type, sizeof(veth_type)))
+ return -1;
+
+ info_data = rtattr_begin(&req.nh, sizeof(req), IFLA_INFO_DATA);
+ if (!info_data)
+ return -1;
+
+ if (veth_pack_peerb(&req.nh, sizeof(req), name, ns_b))
+ return -1;
+
+ rtattr_end(&req.nh, info_data);
+ rtattr_end(&req.nh, link_info);
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, false);
+}
+
+int add_veth(const char *name, int nsfda, int nsfdb)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __add_veth(route_sock, route_seq++, name, nsfda, nsfdb);
+ close(route_sock);
+ return ret;
+}
+
+static int __ip_addr_add(int sock, uint32_t seq, const char *intf,
+ int family, union tcp_addr addr, uint8_t prefix)
+{
+ uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
+ struct {
+ struct nlmsghdr nh;
+ struct ifaddrmsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ size_t addr_len = (family == AF_INET) ? sizeof(struct in_addr) :
+ sizeof(struct in6_addr);
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWADDR;
+ req.nh.nlmsg_flags = flags;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifa_family = family;
+ req.info.ifa_prefixlen = prefix;
+ req.info.ifa_index = if_nametoindex(intf);
+ req.info.ifa_flags = IFA_F_NODAD;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFA_LOCAL, &addr, addr_len))
+ return -1;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, true);
+}
+
+int ip_addr_add(const char *intf, int family,
+ union tcp_addr addr, uint8_t prefix)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __ip_addr_add(route_sock, route_seq++, intf,
+ family, addr, prefix);
+
+ close(route_sock);
+ return ret;
+}
+
+static int __ip_route_add(int sock, uint32_t seq, const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct rtmsg rt;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ unsigned int index = if_nametoindex(intf);
+ size_t addr_len = (family == AF_INET) ? sizeof(struct in_addr) :
+ sizeof(struct in6_addr);
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
+ req.nh.nlmsg_type = RTM_NEWROUTE;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE;
+ req.nh.nlmsg_seq = seq;
+ req.rt.rtm_family = family;
+ req.rt.rtm_dst_len = (family == AF_INET) ? 32 : 128;
+ req.rt.rtm_table = RT_TABLE_MAIN;
+ req.rt.rtm_protocol = RTPROT_BOOT;
+ req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
+ req.rt.rtm_type = RTN_UNICAST;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_DST, &dst, addr_len))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_PREFSRC, &src, addr_len))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_OIF, &index, sizeof(index)))
+ return -1;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+
+ return netlink_check_answer(sock, true);
+}
+
+int ip_route_add(const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __ip_route_add(route_sock, route_seq++, intf, family, src, dst);
+ if (ret == -EEXIST) /* ignoring */
+ ret = 0;
+
+ close(route_sock);
+ return ret;
+}
+
+static int __link_set_up(int sock, uint32_t seq, const char *intf)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifi_family = AF_UNSPEC;
+ req.info.ifi_change = 0xFFFFFFFF;
+ req.info.ifi_index = if_nametoindex(intf);
+ req.info.ifi_flags = IFF_UP;
+ req.info.ifi_change = IFF_UP;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, false);
+}
+
+int link_set_up(const char *intf)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __link_set_up(route_sock, route_seq++, intf);
+
+ close(route_sock);
+ return ret;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/proc.c b/tools/testing/selftests/net/tcp_ao/lib/proc.c
new file mode 100644
index 000000000000..675acf00b50e
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/proc.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdio.h>
+#include "../../../../../include/linux/compiler.h"
+#include "../../../../../include/linux/kernel.h"
+#include "aolib.h"
+
+struct netstat_counter {
+ uint64_t val;
+ char *name;
+};
+
+struct netstat {
+ char *header_name;
+ struct netstat *next;
+ size_t counters_nr;
+ struct netstat_counter *counters;
+};
+
+static struct netstat *lookup_type(struct netstat *ns,
+ const char *type, size_t len)
+{
+ while (ns != NULL) {
+ size_t cmp = max(len, strlen(ns->header_name));
+
+ if (!strncmp(ns->header_name, type, cmp))
+ return ns;
+ ns = ns->next;
+ }
+ return NULL;
+}
+
+static struct netstat *lookup_get(struct netstat *ns,
+ const char *type, const size_t len)
+{
+ struct netstat *ret;
+
+ ret = lookup_type(ns, type, len);
+ if (ret != NULL)
+ return ret;
+
+ ret = malloc(sizeof(struct netstat));
+ if (!ret)
+ test_error("malloc()");
+
+ ret->header_name = strndup(type, len);
+ if (ret->header_name == NULL)
+ test_error("strndup()");
+ ret->next = ns;
+ ret->counters_nr = 0;
+ ret->counters = NULL;
+
+ return ret;
+}
+
+static struct netstat *lookup_get_column(struct netstat *ns, const char *line)
+{
+ char *column;
+
+ column = strchr(line, ':');
+ if (!column)
+ test_error("can't parse netstat file");
+
+ return lookup_get(ns, line, column - line);
+}
+
+static void netstat_read_type(FILE *fnetstat, struct netstat **dest, char *line)
+{
+ struct netstat *type = lookup_get_column(*dest, line);
+ const char *pos = line;
+ size_t i, nr_elems = 0;
+ char tmp;
+
+ while ((pos = strchr(pos, ' '))) {
+ nr_elems++;
+ pos++;
+ }
+
+ *dest = type;
+ type->counters = reallocarray(type->counters,
+ type->counters_nr + nr_elems,
+ sizeof(struct netstat_counter));
+ if (!type->counters)
+ test_error("reallocarray()");
+
+ pos = strchr(line, ' ') + 1;
+
+ if (fscanf(fnetstat, type->header_name) == EOF)
+ test_error("fscanf(%s)", type->header_name);
+ if (fread(&tmp, 1, 1, fnetstat) != 1 || tmp != ':')
+ test_error("Unexpected netstat format (%c)", tmp);
+
+ for (i = type->counters_nr; i < type->counters_nr + nr_elems; i++) {
+ struct netstat_counter *nc = &type->counters[i];
+ const char *new_pos = strchr(pos, ' ');
+ const char *fmt = " %" PRIu64;
+
+ if (new_pos == NULL)
+ new_pos = strchr(pos, '\n');
+
+ nc->name = strndup(pos, new_pos - pos);
+ if (nc->name == NULL)
+ test_error("strndup()");
+
+ if (unlikely(!strcmp(nc->name, "MaxConn")))
+ fmt = " %" PRId64; /* MaxConn is signed, RFC 2012 */
+ if (fscanf(fnetstat, fmt, &nc->val) != 1)
+ test_error("fscanf(%s)", nc->name);
+ pos = new_pos + 1;
+ }
+ type->counters_nr += nr_elems;
+
+ if (fread(&tmp, 1, 1, fnetstat) != 1 || tmp != '\n')
+ test_error("Unexpected netstat format");
+}
+
+static const char *snmp6_name = "Snmp6";
+static void snmp6_read(FILE *fnetstat, struct netstat **dest)
+{
+ struct netstat *type = lookup_get(*dest, snmp6_name, strlen(snmp6_name));
+ char *counter_name;
+ size_t i;
+
+ for (i = type->counters_nr;; i++) {
+ struct netstat_counter *nc;
+ uint64_t counter;
+
+ if (fscanf(fnetstat, "%ms", &counter_name) == EOF)
+ break;
+ if (fscanf(fnetstat, "%" PRIu64, &counter) == EOF)
+ test_error("Unexpected snmp6 format");
+ type->counters = reallocarray(type->counters, i + 1,
+ sizeof(struct netstat_counter));
+ if (!type->counters)
+ test_error("reallocarray()");
+ nc = &type->counters[i];
+ nc->name = counter_name;
+ nc->val = counter;
+ }
+ type->counters_nr = i;
+ *dest = type;
+}
+
+struct netstat *netstat_read(void)
+{
+ struct netstat *ret = 0;
+ size_t line_sz = 0;
+ char *line = NULL;
+ FILE *fnetstat;
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/netstat", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/netstat");
+
+ while (getline(&line, &line_sz, fnetstat) != -1)
+ netstat_read_type(fnetstat, &ret, line);
+ fclose(fnetstat);
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/snmp", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/snmp");
+
+ while (getline(&line, &line_sz, fnetstat) != -1)
+ netstat_read_type(fnetstat, &ret, line);
+ fclose(fnetstat);
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/snmp6", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/snmp6");
+
+ snmp6_read(fnetstat, &ret);
+ fclose(fnetstat);
+
+ free(line);
+ return ret;
+}
+
+void netstat_free(struct netstat *ns)
+{
+ while (ns != NULL) {
+ struct netstat *prev = ns;
+ size_t i;
+
+ free(ns->header_name);
+ for (i = 0; i < ns->counters_nr; i++)
+ free(ns->counters[i].name);
+ free(ns->counters);
+ ns = ns->next;
+ free(prev);
+ }
+}
+
+static inline void
+__netstat_print_diff(uint64_t a, struct netstat *nsb, size_t i)
+{
+ if (unlikely(!strcmp(nsb->header_name, "MaxConn"))) {
+ test_print("%8s %25s: %" PRId64 " => %" PRId64,
+ nsb->header_name, nsb->counters[i].name,
+ a, nsb->counters[i].val);
+ return;
+ }
+
+ test_print("%8s %25s: %" PRIu64 " => %" PRIu64, nsb->header_name,
+ nsb->counters[i].name, a, nsb->counters[i].val);
+}
+
+void netstat_print_diff(struct netstat *nsa, struct netstat *nsb)
+{
+ size_t i, j;
+
+ while (nsb != NULL) {
+ if (unlikely(strcmp(nsb->header_name, nsa->header_name))) {
+ for (i = 0; i < nsb->counters_nr; i++)
+ __netstat_print_diff(0, nsb, i);
+ nsb = nsb->next;
+ continue;
+ }
+
+ if (nsb->counters_nr < nsa->counters_nr)
+ test_error("Unexpected: some counters dissapeared!");
+
+ for (j = 0, i = 0; i < nsb->counters_nr; i++) {
+ if (strcmp(nsb->counters[i].name, nsa->counters[j].name)) {
+ __netstat_print_diff(0, nsb, i);
+ continue;
+ }
+
+ if (nsa->counters[j].val == nsb->counters[i].val) {
+ j++;
+ continue;
+ }
+
+ __netstat_print_diff(nsa->counters[j].val, nsb, i);
+ j++;
+ }
+ if (j != nsa->counters_nr)
+ test_error("Unexpected: some counters dissapeared!");
+
+ nsb = nsb->next;
+ nsa = nsa->next;
+ }
+}
+
+uint64_t netstat_get(struct netstat *ns, const char *name, bool *not_found)
+{
+ if (not_found)
+ *not_found = false;
+
+ while (ns != NULL) {
+ size_t i;
+
+ for (i = 0; i < ns->counters_nr; i++) {
+ if (!strcmp(name, ns->counters[i].name))
+ return ns->counters[i].val;
+ }
+
+ ns = ns->next;
+ }
+
+ if (not_found)
+ *not_found = true;
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/setup.c b/tools/testing/selftests/net/tcp_ao/lib/setup.c
new file mode 100644
index 000000000000..5c100761058c
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/setup.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <signal.h>
+#include "aolib.h"
+
+/*
+ * Can't be included in the header: it defines static variables which
+ * will be unique to every object. Let's include it only once here.
+ */
+#include "../../../kselftest.h"
+
+/* Prevent overriding of one thread's output by another */
+static pthread_mutex_t ksft_print_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void __test_msg(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_print_msg(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+void __test_ok(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_pass(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+void __test_fail(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_fail(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+
+void __test_error(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_error(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+
+void __test_skip(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_skip(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+
+static volatile int failed;
+static volatile int skipped;
+
+void test_failed(void)
+{
+ failed = 1;
+}
+
+static void test_exit(void)
+{
+ if (failed) {
+ ksft_exit_fail();
+ } else if (skipped) {
+ /* ksft_exit_skip() is different from ksft_exit_*() */
+ ksft_print_cnts();
+ exit(KSFT_SKIP);
+ } else {
+ ksft_exit_pass();
+ }
+}
+
+struct dlist_t {
+ void (*destruct)(void);
+ struct dlist_t *next;
+};
+static struct dlist_t *destructors_list;
+
+void test_add_destructor(void (*d)(void))
+{
+ struct dlist_t *p;
+
+ p = malloc(sizeof(struct dlist_t));
+ if (p == NULL)
+ test_error("malloc() failed");
+
+ p->next = destructors_list;
+ p->destruct = d;
+ destructors_list = p;
+}
+
+static void test_destructor(void) __attribute__((destructor));
+static void test_destructor(void)
+{
+ while (destructors_list) {
+ struct dlist_t *p = destructors_list->next;
+
+ destructors_list->destruct();
+ free(destructors_list);
+ destructors_list = p;
+ }
+ test_exit();
+}
+
+static void sig_int(int signo)
+{
+ test_error("Caught SIGINT - exiting");
+}
+
+static int open_netns(void)
+{
+ const char *netns_path = "/proc/self/ns/net";
+ int fd;
+
+ fd = open(netns_path, O_RDONLY);
+ if (fd <= 0)
+ test_error("open(%s)", netns_path);
+ return fd;
+}
+
+static int unshare_open(void)
+{
+ if (unshare(CLONE_NEWNET) != 0)
+ test_error("unshare()");
+
+ return open_netns();
+}
+
+void switch_ns(int fd)
+{
+ if (setns(fd, CLONE_NEWNET))
+ test_error("setns()");
+}
+
+int switch_save_ns(int new_ns)
+{
+ int ret = open_netns();
+
+ switch_ns(new_ns);
+ return ret;
+}
+
+static int nsfd_outside = -1;
+static int nsfd_parent = -1;
+static int nsfd_child = -1;
+const char veth_name[] = "ktst-veth";
+
+static void init_namespaces(void)
+{
+ nsfd_outside = open_netns();
+ nsfd_parent = unshare_open();
+ nsfd_child = unshare_open();
+}
+
+static void link_init(const char *veth, int family, uint8_t prefix,
+ union tcp_addr addr, union tcp_addr dest)
+{
+ if (link_set_up(veth))
+ test_error("Failed to set link up");
+ if (ip_addr_add(veth, family, addr, prefix))
+ test_error("Failed to add ip address");
+ if (ip_route_add(veth, family, addr, dest))
+ test_error("Failed to add route");
+}
+
+static unsigned int nr_threads = 1;
+
+static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t sync_cond = PTHREAD_COND_INITIALIZER;
+static volatile unsigned int stage_threads[2];
+static volatile unsigned int stage_nr;
+
+/* synchronize all threads in the same stage */
+void synchronize_threads(void)
+{
+ unsigned int q = stage_nr;
+
+ pthread_mutex_lock(&sync_lock);
+ stage_threads[q]++;
+ if (stage_threads[q] == nr_threads) {
+ stage_nr ^= 1;
+ stage_threads[stage_nr] = 0;
+ pthread_cond_signal(&sync_cond);
+ }
+ while (stage_threads[q] < nr_threads)
+ pthread_cond_wait(&sync_cond, &sync_lock);
+ pthread_mutex_unlock(&sync_lock);
+}
+
+__thread union tcp_addr this_ip_addr;
+__thread union tcp_addr this_ip_dest;
+int test_family;
+
+struct new_pthread_arg {
+ thread_fn func;
+ union tcp_addr my_ip;
+ union tcp_addr dest_ip;
+};
+static void *new_pthread_entry(void *arg)
+{
+ struct new_pthread_arg *p = arg;
+
+ this_ip_addr = p->my_ip;
+ this_ip_dest = p->dest_ip;
+ p->func(NULL); /* shouldn't return */
+ exit(KSFT_FAIL);
+}
+
+static void check_tcp_ao_support(void)
+{
+ struct sockaddr_in addr = {
+ .sin_family = test_family,
+ };
+ struct tcp_ao tmp = {};
+ const char *password = "password";
+ int sk;
+
+ sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sk < 0)
+ test_error("socket()");
+
+ tmp.tcpa_sndid = 100;
+ tmp.tcpa_rcvid = 100;
+ memcpy(tmp.tcpa_key, password, strlen(password));
+ strcpy(tmp.tcpa_alg_name, "cmac(aes128)");
+ memcpy(&tmp.tcpa_addr, &addr, sizeof(addr));
+ if (setsockopt(sk, IPPROTO_TCP, TCP_AO, &tmp, sizeof(tmp)) < 0) {
+ if (errno == ENOPROTOOPT) {
+ ksft_set_plan(1);
+ ksft_print_header();
+ skipped = 1;
+ test_skip("setsockopt(TCP_AO) is not supported");
+ exit(KSFT_SKIP);
+ } else {
+ test_error("setsockopt(TCP_AO)");
+ }
+ }
+ close(sk);
+}
+
+void __test_init(unsigned int ntests, int family, unsigned int prefix,
+ union tcp_addr addr1, union tcp_addr addr2,
+ thread_fn peer1, thread_fn peer2)
+{
+ struct sigaction sa = {
+ .sa_handler = sig_int,
+ .sa_flags = SA_RESTART,
+ };
+ time_t seed = time(NULL);
+
+ test_family = family;
+ check_tcp_ao_support();
+ ksft_set_plan(ntests);
+
+ test_print("rand seed %u", (unsigned int)seed);
+ srand(seed);
+
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(SIGINT, &sa, NULL))
+ test_error("Can't set SIGINT handler");
+
+ ksft_print_header();
+ init_namespaces();
+
+ if (add_veth(veth_name, nsfd_parent, nsfd_child))
+ test_error("Failed to add veth");
+
+ switch_ns(nsfd_child);
+ link_init(veth_name, family, prefix, addr2, addr1);
+ if (peer2) {
+ struct new_pthread_arg targ;
+ pthread_t t;
+
+ targ.my_ip = addr2;
+ targ.dest_ip = addr1;
+ targ.func = peer2;
+ nr_threads++;
+ if (pthread_create(&t, NULL, new_pthread_entry, &targ))
+ test_error("Failed to create pthread");
+ }
+ switch_ns(nsfd_parent);
+ link_init(veth_name, family, prefix, addr1, addr2);
+
+ this_ip_addr = addr1;
+ this_ip_dest = addr2;
+ peer1(NULL);
+ if (failed)
+ exit(KSFT_FAIL);
+ else
+ exit(KSFT_PASS);
+}
+
+/* /proc/sys/net/core/optmem_max artifically limits the amount of memory
+ * that can be allocated with sock_kmalloc() on each socket in the system.
+ * It is not virtualized, so it has to written outside test namespaces.
+ * To be nice a test will revert optmem back to the old value.
+ * Keeping it simple without any file lock, which means the tests that
+ * need to set/increase optmem value shouldn't run in parallel.
+ * Also, not re-entrant.
+ */
+static const char *optmem_file = "/proc/sys/net/core/optmem_max";
+static size_t saved_optmem;
+
+static void __test_set_optmem(size_t new, size_t *old)
+{
+ FILE *foptmem;
+ int old_ns;
+
+ old_ns = switch_save_ns(nsfd_outside);
+ foptmem = fopen(optmem_file, "r+");
+ if (!foptmem)
+ test_error("failed to open %s", optmem_file);
+
+ if (old != NULL) {
+ if (fscanf(foptmem, "%zu", old) != 1)
+ test_error("can't read from %s", optmem_file);
+ fclose(foptmem);
+ foptmem = fopen(optmem_file, "w");
+ if (!foptmem)
+ test_error("failed to open %s", optmem_file);
+ }
+
+ if (fprintf(foptmem, "%zu", new) <= 0)
+ test_error("can't write %zu to %s", new, optmem_file);
+ fclose(foptmem);
+ switch_ns(old_ns);
+}
+
+static void test_revert_optmem(void)
+{
+ if (saved_optmem == 0)
+ return;
+
+ __test_set_optmem(saved_optmem, NULL);
+}
+
+void test_set_optmem(size_t value)
+{
+ if (saved_optmem == 0) {
+ __test_set_optmem(value, &saved_optmem);
+ test_add_destructor(test_revert_optmem);
+ } else {
+ __test_set_optmem(value, NULL);
+ }
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/sock.c b/tools/testing/selftests/net/tcp_ao/lib/sock.c
new file mode 100644
index 000000000000..47480797c9b6
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/sock.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <alloca.h>
+#include <fcntl.h>
+#include <string.h>
+#include "../../../../../include/linux/kernel.h"
+#include "../../../../../include/linux/stringify.h"
+#include "aolib.h"
+
+const unsigned int test_server_port = 7010;
+int __test_listen_socket(int backlog, void *addr, size_t addr_sz)
+{
+ int err, sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ long flags;
+
+ if (sk < 0)
+ test_error("socket()");
+
+ err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE, veth_name,
+ strlen(veth_name) + 1);
+ if (err < 0)
+ test_error("setsockopt(SO_BINDTODEVICE)");
+
+ if (bind(sk, (struct sockaddr *)addr, addr_sz) < 0)
+ test_error("bind()");
+
+ flags = fcntl(sk, F_GETFL);
+ if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
+ test_error("fcntl()");
+
+ if (listen(sk, backlog))
+ test_error("listen()");
+
+ return sk;
+}
+
+int test_wait_fd(int sk, time_t sec, bool write)
+{
+ struct timeval tv = { .tv_sec = sec };
+ struct timeval *ptv = NULL;
+ fd_set fds, efds;
+ int ret;
+ socklen_t slen = sizeof(ret);
+
+ FD_ZERO(&fds);
+ FD_SET(sk, &fds);
+ FD_ZERO(&efds);
+ FD_SET(sk, &efds);
+
+ if (sec)
+ ptv = &tv;
+
+ errno = 0;
+ if (write)
+ ret = select(sk + 1, NULL, &fds, &efds, ptv);
+ else
+ ret = select(sk + 1, &fds, NULL, &efds, ptv);
+ if (ret <= 0)
+ return -errno;
+
+ if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &ret, &slen) || ret)
+ return -ret;
+ return sk;
+}
+
+int __test_connect_socket(int sk, void *addr, size_t addr_sz, time_t timeout)
+{
+ long flags;
+ int err;
+
+ err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE, veth_name,
+ strlen(veth_name) + 1);
+ if (err < 0)
+ test_error("setsockopt(SO_BINDTODEVICE)");
+
+ if (!timeout) {
+ err = connect(sk, addr, addr_sz);
+ if (err) {
+ err = -errno;
+ goto out;
+ }
+ return 0;
+ }
+
+ flags = fcntl(sk, F_GETFL);
+ if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
+ test_error("fcntl()");
+
+ if (connect(sk, addr, addr_sz) < 0) {
+ if (errno != EINPROGRESS) {
+ err = -errno;
+ goto out;
+ }
+ err = test_wait_fd(sk, timeout, 1);
+ if (err <= 0)
+ goto out;
+ }
+ return sk;
+
+out:
+ close(sk);
+ return err;
+}
+
+int test_prepare_ao_sockaddr(struct tcp_ao *ao, const char *alg, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key)
+{
+ memset(ao, 0, sizeof(struct tcp_ao));
+
+ ao->tcpa_flags = flags;
+ ao->tcpa_prefix = prefix;
+ ao->tcpa_sndid = sndid;
+ ao->tcpa_rcvid = rcvid;
+ ao->tcpa_maclen = maclen;
+ ao->tcpa_keyflags = keyflags;
+ ao->tcpa_keylen = keylen;
+
+ memcpy(&ao->tcpa_addr, addr, addr_sz);
+
+ if (strlen(alg) > 64)
+ return -ENOBUFS;
+ strncpy(ao->tcpa_alg_name, alg, 64);
+
+ memcpy(ao->tcpa_key, key,
+ (keylen > TCP_AO_MAXKEYLEN ) ? TCP_AO_MAXKEYLEN : keylen);
+ return 0;
+}
+
+int test_get_one_ao(int sk, struct tcp_ao_getsockopt *out, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ struct tcp_ao_getsockopt tmp = {};
+ socklen_t tmp_sz = sizeof(tmp);
+ int ret;
+
+ memcpy(&tmp.addr, addr, addr_sz);
+ tmp.prefix = prefix;
+ tmp.sndid = sndid;
+ tmp.rcvid = rcvid;
+ tmp.flags = flags;
+ tmp.nkeys = 1;
+
+ ret = getsockopt(sk, IPPROTO_TCP, TCP_AO_GET, &tmp, &tmp_sz);
+ if (ret)
+ return ret;
+ if (tmp.nkeys != 1)
+ return -ENOENT;
+ *out = tmp;
+ return 0;
+}
+
+int test_cmp_getsockopt_setsockopt(const struct tcp_ao *a,
+ const struct tcp_ao_getsockopt *b)
+{
+ bool is_kdf_aes_128_cmac = false;
+
+ if (!strcmp("cmac(aes128)", a->tcpa_alg_name))
+ is_kdf_aes_128_cmac = (a->tcpa_keylen != 16);
+
+#define __cmp_ao(member) \
+ if (b->member != a->tcpa_##member) { \
+ test_fail("getsockopt(): " __stringify(member) " %u != %u", \
+ b->member, a->tcpa_##member); \
+ return -1; \
+ }
+ __cmp_ao(sndid);
+ __cmp_ao(rcvid);
+ __cmp_ao(prefix);
+ __cmp_ao(keyflags);
+ if (a->tcpa_maclen) {
+ __cmp_ao(maclen);
+ } else if (b->maclen != 12) {
+ test_fail("getsockopt(): expected default maclen 12, but it's %u",
+ b->maclen);
+ return -1;
+ }
+ if (!is_kdf_aes_128_cmac) {
+ __cmp_ao(keylen);
+ } else if (b->keylen != 16) {
+ test_fail("getsockopt(): expected keylen 16 for cmac(aes128), but it's %u",
+ b->keylen);
+ return -1;
+ }
+#undef __cmp_ao
+ if (!is_kdf_aes_128_cmac && memcmp(b->key, a->tcpa_key, a->tcpa_keylen)) {
+ test_fail("getsockopt(): returned key is different `%s' != `%s'",
+ b->key, a->tcpa_key);
+ return -1;
+ }
+ if (memcmp(&b->addr, &a->tcpa_addr, sizeof(b->addr))) {
+ test_fail("getsockopt(): returned address is different");
+ return -1;
+ }
+ if (!is_kdf_aes_128_cmac && strcmp(b->alg_name, a->tcpa_alg_name)) {
+ test_fail("getsockopt(): returned algorithm is different");
+ return -1;
+ }
+ if (is_kdf_aes_128_cmac && strcmp(b->alg_name, "cmac(aes)")) {
+ test_fail("getsockopt(): returned algorithm is different");
+ return -1;
+ }
+ return 0;
+}
+
+#define TEST_BUF_SIZE 4096
+ssize_t test_server_run(int sk, ssize_t quota, time_t timeout_sec)
+{
+ ssize_t total = 0;
+
+ do {
+ char buf[TEST_BUF_SIZE];
+ ssize_t bytes, sent;
+ int ret;
+
+ ret = test_wait_fd(sk, timeout_sec, 0);
+ if (ret <= 0)
+ return ret;
+
+ bytes = recv(sk, buf, sizeof(buf), 0);
+
+ if (bytes < 0)
+ test_error("recv(): %zd", bytes);
+ if (bytes == 0)
+ break;
+
+ ret = test_wait_fd(sk, timeout_sec, 1);
+ if (ret <= 0)
+ return ret;
+
+ sent = send(sk, buf, bytes, 0);
+ if (sent == 0)
+ break;
+ if (sent != bytes)
+ test_error("send()");
+ total += bytes;
+ } while (!quota || total < quota);
+
+ return total;
+}
+
+ssize_t test_client_loop(int sk, char *buf, size_t buf_sz,
+ const size_t msg_len, time_t timeout_sec)
+{
+ char msg[msg_len];
+ int nodelay = 1;
+ size_t i;
+
+ if (setsockopt(sk, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)))
+ test_error("setsockopt(TCP_NODELAY)");
+
+ for (i = 0; i < buf_sz; i += min(msg_len, buf_sz - i)) {
+ size_t sent, bytes = min(msg_len, buf_sz - i);
+ int ret;
+
+ ret = test_wait_fd(sk, timeout_sec, 1);
+ if (ret <= 0)
+ return ret;
+
+ sent = send(sk, buf + i, bytes, 0);
+ if (sent == 0)
+ break;
+ if (sent != bytes)
+ test_error("send()");
+
+ ret = test_wait_fd(sk, timeout_sec, 0);
+ if (ret <= 0)
+ return ret;
+
+ bytes = recv(sk, msg, sizeof(msg), 0);
+ if (bytes < 0)
+ test_error("recv(): %zd", bytes);
+ if (bytes != sent)
+ test_error("recv(): %zd != %zd", bytes, sent);
+ if (memcmp(buf + i, msg, bytes) != 0) {
+ test_fail("received message differs");
+ return -1;
+ }
+ }
+ return i;
+}
+
+int test_client_verify(int sk, const size_t msg_len, const size_t nr,
+ time_t timeout_sec)
+{
+ size_t buf_sz = msg_len * nr;
+ char *buf = alloca(buf_sz);
+
+ randomize_buffer(buf, buf_sz);
+ if (test_client_loop(sk, buf, buf_sz, msg_len, timeout_sec) != buf_sz)
+ return -1;
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/utils.c b/tools/testing/selftests/net/tcp_ao/lib/utils.c
new file mode 100644
index 000000000000..372daca525f5
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/utils.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "aolib.h"
+#include <string.h>
+
+void randomize_buffer(void *buf, size_t buflen)
+{
+ int *p = (int *)buf;
+ size_t words = buflen / sizeof(int);
+ size_t leftover = buflen % sizeof(int);
+
+ if (!buflen)
+ return;
+
+ while (words--)
+ *p++ = rand();
+
+ if (leftover) {
+ int tmp = rand();
+
+ memcpy(buf + buflen - leftover, &tmp, leftover);
+ }
+}
+
+const struct sockaddr_in6 addr_any6 = {
+ .sin6_family = AF_INET6,
+};
+
+const struct sockaddr_in addr_any4 = {
+ .sin_family = AF_INET,
+};
--
2.38.1
Hand-crafted ICMP packets are sent to the server, the server checks for
hard/soft errors and fails if any.
Expected output for ipv4 version:
> # ./icmps-discard_ipv4
> 1..3
> # 3164[lib/setup.c:166] rand seed 1642623745
> TAP version 13
> # 3164[lib/proc.c:207] Snmp6 Ip6InReceives: 0 => 1
> # 3164[lib/proc.c:207] Snmp6 Ip6InNoRoutes: 0 => 1
> # 3164[lib/proc.c:207] Snmp6 Ip6InOctets: 0 => 76
> # 3164[lib/proc.c:207] Snmp6 Ip6InNoECTPkts: 0 => 1
> # 3164[lib/proc.c:207] Tcp InSegs: 2 => 203
> # 3164[lib/proc.c:207] Tcp OutSegs: 1 => 202
> # 3164[lib/proc.c:207] IcmpMsg InType3: 0 => 543
> # 3164[lib/proc.c:207] Icmp InMsgs: 0 => 543
> # 3164[lib/proc.c:207] Icmp InDestUnreachs: 0 => 543
> # 3164[lib/proc.c:207] Ip InReceives: 2 => 746
> # 3164[lib/proc.c:207] Ip InDelivers: 2 => 746
> # 3164[lib/proc.c:207] Ip OutRequests: 1 => 202
> # 3164[lib/proc.c:207] IpExt InOctets: 132 => 61684
> # 3164[lib/proc.c:207] IpExt OutOctets: 68 => 31324
> # 3164[lib/proc.c:207] IpExt InNoECTPkts: 2 => 744
> # 3164[lib/proc.c:207] TcpExt TCPPureAcks: 1 => 2
> # 3164[lib/proc.c:207] TcpExt TCPOrigDataSent: 0 => 200
> # 3164[lib/proc.c:207] TcpExt TCPDelivered: 0 => 199
> # 3164[lib/proc.c:207] TcpExt TCPAOGood: 2 => 203
> # 3164[lib/proc.c:207] TcpExt TCPAODroppedIcmps: 0 => 541
> ok 1 InDestUnreachs delivered 543
> ok 2 Server survived 20000 bytes of traffic
> ok 3 ICMPs ignored 541
> # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
Expected output for ipv6 version:
> # ./icmps-discard_ipv6
> 1..3
> # 3186[lib/setup.c:166] rand seed 1642623803
> TAP version 13
> # 3186[lib/proc.c:207] Snmp6 Ip6InReceives: 4 => 568
> # 3186[lib/proc.c:207] Snmp6 Ip6InDelivers: 3 => 564
> # 3186[lib/proc.c:207] Snmp6 Ip6OutRequests: 2 => 204
> # 3186[lib/proc.c:207] Snmp6 Ip6InMcastPkts: 1 => 4
> # 3186[lib/proc.c:207] Snmp6 Ip6OutMcastPkts: 0 => 1
> # 3186[lib/proc.c:207] Snmp6 Ip6InOctets: 320 => 70420
> # 3186[lib/proc.c:207] Snmp6 Ip6OutOctets: 160 => 35512
> # 3186[lib/proc.c:207] Snmp6 Ip6InMcastOctets: 72 => 336
> # 3186[lib/proc.c:207] Snmp6 Ip6OutMcastOctets: 0 => 76
> # 3186[lib/proc.c:207] Snmp6 Ip6InNoECTPkts: 4 => 568
> # 3186[lib/proc.c:207] Snmp6 Icmp6InMsgs: 1 => 361
> # 3186[lib/proc.c:207] Snmp6 Icmp6OutMsgs: 1 => 2
> # 3186[lib/proc.c:207] Snmp6 Icmp6InDestUnreachs: 0 => 360
> # 3186[lib/proc.c:207] Snmp6 Icmp6OutMLDv2Reports: 0 => 1
> # 3186[lib/proc.c:207] Snmp6 Icmp6InType1: 0 => 360
> # 3186[lib/proc.c:207] Snmp6 Icmp6OutType143: 0 => 1
> # 3186[lib/proc.c:207] Tcp InSegs: 2 => 203
> # 3186[lib/proc.c:207] Tcp OutSegs: 1 => 202
> # 3186[lib/proc.c:207] TcpExt TCPPureAcks: 1 => 2
> # 3186[lib/proc.c:207] TcpExt TCPOrigDataSent: 0 => 200
> # 3186[lib/proc.c:207] TcpExt TCPDelivered: 0 => 199
> # 3186[lib/proc.c:207] TcpExt TCPAOGood: 2 => 203
> # 3186[lib/proc.c:207] TcpExt TCPAODroppedIcmps: 0 => 360
> ok 1 Icmp6InDestUnreachs delivered 360
> ok 2 Server survived 20000 bytes of traffic
> ok 3 ICMPs ignored 360
> # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/tcp_ao/Makefile | 2 +-
.../selftests/net/tcp_ao/icmps-discard.c | 433 ++++++++++++++++++
2 files changed, 434 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/tcp_ao/icmps-discard.c
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index cb23d67944d7..9acfd782c20f 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-TEST_BOTH_AF := connect
+TEST_BOTH_AF := connect icmps-discard
TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
diff --git a/tools/testing/selftests/net/tcp_ao/icmps-discard.c b/tools/testing/selftests/net/tcp_ao/icmps-discard.c
new file mode 100644
index 000000000000..07eba1308b4e
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/icmps-discard.c
@@ -0,0 +1,433 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Selftest that verifies that incomping ICMPs are ignored,
+ * the TCP connection stays alive, no hard or soft errors get reported
+ * to the usespace and the counter for ignored ICMPs is updated.
+ *
+ * RFC5925, 7.8:
+ * >> A TCP-AO implementation MUST default to ignore incoming ICMPv4
+ * messages of Type 3 (destination unreachable), Codes 2-4 (protocol
+ * unreachable, port unreachable, and fragmentation needed -- ’hard
+ * errors’), and ICMPv6 Type 1 (destination unreachable), Code 1
+ * (administratively prohibited) and Code 4 (port unreachable) intended
+ * for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN-
+ * WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs.
+ *
+ * Author: Dmitry Safonov <[email protected]>
+ */
+#include <inttypes.h>
+#include <linux/icmp.h>
+#include <linux/icmpv6.h>
+#include <linux/ipv6.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <sys/socket.h>
+#include "aolib.h"
+
+#ifndef SOL_TCP
+/* can't include <netinet/tcp.h> as including <linux/tcp.h> */
+# define SOL_TCP 6 /* TCP level */
+#endif
+
+const size_t packets_nr = 20;
+const size_t packet_size = 100;
+const char *tcpao_icmps = "TCPAODroppedIcmps";
+
+#ifdef IPV6_TEST
+const char *dst_unreach = "Icmp6InDestUnreachs";
+const int sk_ip_level = SOL_IPV6;
+const int sk_recverr = IPV6_RECVERR;
+#else
+const char *dst_unreach = "InDestUnreachs";
+const int sk_ip_level = SOL_IP;
+const int sk_recverr = IP_RECVERR;
+#endif
+
+#define test_icmps_fail test_fail
+#define test_icmps_ok test_ok
+
+static void serve_interfered(int sk)
+{
+ ssize_t test_quota = packet_size * packets_nr * 10;
+ uint64_t dest_unreach_a, dest_unreach_b;
+ uint64_t icmp_ignored_a, icmp_ignored_b;
+ bool counter_not_found;
+ struct netstat *ns_after, *ns_before;
+ ssize_t bytes;
+
+ ns_before = netstat_read();
+ dest_unreach_a = netstat_get(ns_before, dst_unreach, NULL);
+ icmp_ignored_a = netstat_get(ns_before, tcpao_icmps, NULL);
+ bytes = test_server_run(sk, test_quota, 0);
+ ns_after = netstat_read();
+ netstat_print_diff(ns_before, ns_after);
+ dest_unreach_b = netstat_get(ns_after, dst_unreach, NULL);
+ icmp_ignored_b = netstat_get(ns_after, tcpao_icmps,
+ &counter_not_found);
+
+ netstat_free(ns_before);
+ netstat_free(ns_after);
+
+ if (dest_unreach_a >= dest_unreach_b) {
+ test_fail("%s counter didn't change: %" PRIu64 " >= %" PRIu64,
+ dst_unreach, dest_unreach_a, dest_unreach_b);
+ return;
+ }
+ test_ok("%s delivered %" PRIu64,
+ dst_unreach, dest_unreach_b - dest_unreach_a);
+ if (bytes < 0)
+ test_icmps_fail("Server failed with %zd: %s", bytes, strerrordesc_np(-bytes));
+ else
+ test_icmps_ok("Server survived %zd bytes of traffic", test_quota);
+ if (counter_not_found) {
+ test_fail("Not found %s counter", tcpao_icmps);
+ return;
+ }
+ if (icmp_ignored_a >= icmp_ignored_b) {
+ test_icmps_fail("%s counter didn't change: %" PRIu64 " >= %" PRIu64,
+ tcpao_icmps, icmp_ignored_a, icmp_ignored_b);
+ return;
+ }
+ test_icmps_ok("ICMPs ignored %" PRIu64, icmp_ignored_b - icmp_ignored_a);
+}
+
+static void *server_fn(void *arg)
+{
+ int val, err, sk, lsk;
+ uint16_t flags = 0;
+
+ lsk = test_listen_socket(this_ip_addr, test_server_port, 1);
+
+ if (test_set_ao(lsk, "password", flags, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+ synchronize_threads();
+
+ err = test_wait_fd(lsk, TEST_TIMEOUT_SEC, 0);
+ if (!err)
+ test_error("timeouted for accept()");
+ else if (err < 0)
+ test_error("test_wait_fd()");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0)
+ test_error("accept()");
+
+ /* Fail on hard ip errors, such as dest unreachable (RFC1122) */
+ val = 1;
+ if (setsockopt(sk, sk_ip_level, sk_recverr, &val, sizeof(val)))
+ test_error("setsockopt()");
+
+ synchronize_threads();
+
+ serve_interfered(sk);
+ return NULL;
+}
+
+static size_t packets_sent;
+static size_t icmps_sent;
+
+static uint32_t checksum4_nofold(void *data, size_t len, uint32_t sum)
+{
+ uint16_t *words = data;
+ size_t i;
+
+ for (i = 0; i < len / sizeof(uint16_t); i++)
+ sum += words[i];
+ if (len & 1)
+ sum += ((char *)data)[len - 1];
+ return sum;
+}
+
+static uint16_t checksum4_fold(void *data, size_t len, uint32_t sum)
+{
+ sum = checksum4_nofold(data, len, sum);
+ while (sum > 0xFFFF)
+ sum = (sum & 0xFFFF) + (sum >> 16);
+ return ~sum;
+}
+
+static void set_ip4hdr(struct iphdr *iph, size_t packet_len, int proto,
+ struct sockaddr_in *src, struct sockaddr_in *dst)
+{
+ iph->version = 4;
+ iph->ihl = 5;
+ iph->tos = 0;
+ iph->tot_len = htons(packet_len);
+ iph->ttl = 2;
+ iph->protocol = proto;
+ iph->saddr = src->sin_addr.s_addr;
+ iph->daddr = dst->sin_addr.s_addr;
+ iph->check = checksum4_fold((void *)iph, iph->ihl << 1, 0);
+}
+
+static void icmp_interfere4(uint8_t type, uint8_t code, uint32_t rcv_nxt,
+ struct sockaddr_in *src, struct sockaddr_in *dst)
+{
+ int sk = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+ struct {
+ struct iphdr iph;
+ struct icmphdr icmph;
+ struct iphdr iphe;
+ struct {
+ uint16_t sport;
+ uint16_t dport;
+ uint32_t seq;
+ } tcph;
+ } packet = {};
+ size_t packet_len;
+ ssize_t bytes;
+
+ if (sk < 0)
+ test_error("socket(AF_INET, SOCK_RAW, IPPROTO_RAW)");
+
+ packet_len = sizeof(packet);
+ set_ip4hdr(&packet.iph, packet_len, IPPROTO_ICMP, src, dst);
+
+ packet.icmph.type = type;
+ packet.icmph.code = code;
+ if (code == ICMP_FRAG_NEEDED) {
+ randomize_buffer(&packet.icmph.un.frag.mtu,
+ sizeof(packet.icmph.un.frag.mtu));
+ }
+
+ packet_len = sizeof(packet.iphe) + sizeof(packet.tcph);
+ set_ip4hdr(&packet.iphe, packet_len, IPPROTO_TCP, dst, src);
+
+ packet.tcph.sport = dst->sin_port;
+ packet.tcph.dport = src->sin_port;
+ packet.tcph.seq = htonl(rcv_nxt);
+
+ packet_len = sizeof(packet) - sizeof(packet.iph);
+ packet.icmph.checksum = checksum4_fold((void *)&packet.icmph,
+ packet_len, 0);
+
+ bytes = sendto(sk, &packet, sizeof(packet), 0,
+ (struct sockaddr *)dst, sizeof(*dst));
+ if (bytes != sizeof(packet))
+ test_error("send(): %zd", bytes);
+ icmps_sent++;
+
+ close(sk);
+}
+
+static void set_ip6hdr(struct ipv6hdr *iph, size_t packet_len, int proto,
+ struct sockaddr_in6 *src, struct sockaddr_in6 *dst)
+{
+ iph->version = 6;
+ iph->payload_len = htons(packet_len);
+ iph->nexthdr = proto;
+ iph->hop_limit = 2;
+ iph->saddr = src->sin6_addr;
+ iph->daddr = dst->sin6_addr;
+}
+
+static inline uint16_t csum_fold(uint32_t csum)
+{
+ uint32_t sum = csum;
+
+ sum = (sum & 0xffff) + (sum >> 16);
+ sum = (sum & 0xffff) + (sum >> 16);
+ return (uint16_t)~sum;
+}
+
+static inline uint32_t csum_add(uint32_t csum, uint32_t addend)
+{
+ uint32_t res = csum;
+
+ res += addend;
+ return res + (res < addend);
+}
+
+__attribute__ ((noinline)) uint32_t checksum6_nofold(void *data, size_t len, uint32_t sum)
+{
+ uint16_t *words = data;
+ size_t i;
+
+ for (i = 0; i < len / sizeof(uint16_t); i++)
+ sum = csum_add(sum, words[i]);
+ if (len & 1)
+ sum = csum_add(sum, ((char *)data)[len - 1]);
+ return sum;
+}
+
+__attribute__ ((noinline)) uint16_t icmp6_checksum(struct sockaddr_in6 *src,
+ struct sockaddr_in6 *dst,
+ void *ptr, size_t len, uint8_t proto)
+{
+ struct {
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+ uint32_t payload_len;
+ uint8_t zero[3];
+ uint8_t nexthdr;
+ } pseudo_header = {};
+ uint32_t sum;
+
+ pseudo_header.saddr = src->sin6_addr;
+ pseudo_header.daddr = dst->sin6_addr;
+ pseudo_header.payload_len = htonl(len);
+ pseudo_header.nexthdr = proto;
+
+ sum = checksum6_nofold(&pseudo_header, sizeof(pseudo_header), 0);
+ sum = checksum6_nofold(ptr, len, sum);
+
+ return csum_fold(sum);
+}
+
+static void icmp6_interfere(int type, int code, uint32_t rcv_nxt,
+ struct sockaddr_in6 *src, struct sockaddr_in6 *dst)
+{
+ int sk = socket(AF_INET6, SOCK_RAW, IPPROTO_RAW);
+ struct sockaddr_in6 dst_raw = *dst;
+ struct {
+ struct ipv6hdr iph;
+ struct icmp6hdr icmph;
+ struct ipv6hdr iphe;
+ struct {
+ uint16_t sport;
+ uint16_t dport;
+ uint32_t seq;
+ } tcph;
+ } packet = {};
+ size_t packet_len;
+ ssize_t bytes;
+
+
+ if (sk < 0)
+ test_error("socket(AF_INET6, SOCK_RAW, IPPROTO_RAW)");
+
+ packet_len = sizeof(packet) - sizeof(packet.iph);
+ set_ip6hdr(&packet.iph, packet_len, IPPROTO_ICMPV6, src, dst);
+
+ packet.icmph.icmp6_type = type;
+ packet.icmph.icmp6_code = code;
+
+ packet_len = sizeof(packet.iphe) + sizeof(packet.tcph);
+ set_ip6hdr(&packet.iphe, packet_len, IPPROTO_TCP, dst, src);
+
+ packet.tcph.sport = dst->sin6_port;
+ packet.tcph.dport = src->sin6_port;
+ packet.tcph.seq = htonl(rcv_nxt);
+
+ packet_len = sizeof(packet) - sizeof(packet.iph);
+
+ packet.icmph.icmp6_cksum = icmp6_checksum(src, dst,
+ (void *)&packet.icmph, packet_len, IPPROTO_ICMPV6);
+
+ dst_raw.sin6_port = htons(IPPROTO_RAW);
+ bytes = sendto(sk, &packet, sizeof(packet), 0,
+ (struct sockaddr *)&dst_raw, sizeof(dst_raw));
+ if (bytes != sizeof(packet))
+ test_error("send(): %zd", bytes);
+ icmps_sent++;
+
+ close(sk);
+}
+
+static uint32_t get_rcv_nxt(int sk)
+{
+ int val = TCP_REPAIR_ON;
+ uint32_t ret;
+ socklen_t sz = sizeof(ret);
+
+ if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
+ test_error("setsockopt(TCP_REPAIR)");
+ val = TCP_RECV_QUEUE;
+ if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &val, sizeof(val)))
+ test_error("setsockopt(TCP_REPAIR_QUEUE)");
+ if (getsockopt(sk, SOL_TCP, TCP_QUEUE_SEQ, &ret, &sz))
+ test_error("getsockopt(TCP_QUEUE_SEQ)");
+ val = TCP_REPAIR_OFF_NO_WP;
+ if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
+ test_error("setsockopt(TCP_REPAIR)");
+ return ret;
+}
+
+static void icmp_interfere(const size_t nr, uint32_t rcv_nxt, void *src, void *dst)
+{
+ struct sockaddr_in *saddr4 = src;
+ struct sockaddr_in *daddr4 = dst;
+ struct sockaddr_in6 *saddr6 = src;
+ struct sockaddr_in6 *daddr6 = dst;
+ size_t i;
+
+ if (saddr4->sin_family != daddr4->sin_family)
+ test_error("Different address families");
+
+ for (i = 0; i < nr; i++) {
+ if (saddr4->sin_family == AF_INET) {
+ icmp_interfere4(ICMP_DEST_UNREACH, ICMP_PROT_UNREACH,
+ rcv_nxt, saddr4, daddr4);
+ icmp_interfere4(ICMP_DEST_UNREACH, ICMP_PORT_UNREACH,
+ rcv_nxt, saddr4, daddr4);
+ icmp_interfere4(ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ rcv_nxt, saddr4, daddr4);
+ icmps_sent += 3;
+ } else if (saddr4->sin_family == AF_INET6) {
+ icmp6_interfere(ICMPV6_DEST_UNREACH,
+ ICMPV6_ADM_PROHIBITED,
+ rcv_nxt, saddr6, daddr6);
+ icmp6_interfere(ICMPV6_DEST_UNREACH,
+ ICMPV6_PORT_UNREACH,
+ rcv_nxt, saddr6, daddr6);
+ icmps_sent += 2;
+ } else {
+ test_error("Not ip address family");
+ }
+ }
+}
+
+static void send_interfered(int sk)
+{
+ const unsigned int timeout = TEST_TIMEOUT_SEC;
+ struct sockaddr_in6 src, dst;
+ socklen_t addr_sz;
+
+ addr_sz = sizeof(src);
+ if (getsockname(sk, &src, &addr_sz))
+ test_error("getsockname()");
+ addr_sz = sizeof(dst);
+ if (getpeername(sk, &dst, &addr_sz))
+ test_error("getpeername()");
+
+ while (1) {
+ uint32_t rcv_nxt;
+
+ if (test_client_verify(sk, packet_size, packets_nr, timeout)) {
+ test_fail("client: connection is broken");
+ return;
+ }
+ packets_sent += packets_nr;
+ rcv_nxt = get_rcv_nxt(sk);
+ icmp_interfere(packets_nr, rcv_nxt, (void *)&src, (void *)&dst);
+ }
+}
+
+static void *client_fn(void *arg)
+{
+ int sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+
+ if (sk < 0)
+ test_error("socket()");
+
+ if (test_set_ao(sk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads();
+ if (test_connect_socket(sk, this_ip_dest, test_server_port) <= 0)
+ test_error("failed to connect()");
+ synchronize_threads();
+
+ send_interfered(sk);
+
+ /* Not expecting client to quit */
+ test_fail("client disconnected");
+
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(3, server_fn, client_fn);
+ return 0;
+}
--
2.38.1
Add TCP-AO tests on connect()/accept() pair.
SNMP counters exposed by kernel are very useful here to verify the
expected behavior of TCP-AO.
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/tcp_ao/Makefile | 2 +-
.../selftests/net/tcp_ao/connect-deny.c | 217 ++++++++++++++++++
2 files changed, 218 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/tcp_ao/connect-deny.c
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index a178bde0af08..5064e34ebe38 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-TEST_BOTH_AF := connect icmps-discard icmps-accept
+TEST_BOTH_AF := connect icmps-discard icmps-accept connect-deny
TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
diff --git a/tools/testing/selftests/net/tcp_ao/connect-deny.c b/tools/testing/selftests/net/tcp_ao/connect-deny.c
new file mode 100644
index 000000000000..8f1b067e611f
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/connect-deny.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dmitry Safonov <[email protected]> */
+#include <inttypes.h>
+#include "aolib.h"
+
+typedef uint8_t fault_t;
+#define F_TIMEOUT 1
+#define F_KEYREJECT 2
+
+#define fault(type) (inj == type)
+
+static void try_accept(const char *tst_name, unsigned int port, const char *pwd,
+ union tcp_addr addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, const char *cnt_name,
+ fault_t inj)
+{
+ uint64_t before_cnt, after_cnt;
+ int lsk, err, sk = 0;
+ time_t timeout;
+
+ lsk = test_listen_socket(this_ip_addr, port, 1);
+
+ if (pwd && test_set_ao(lsk, pwd, 0, addr, prefix, sndid, rcvid))
+ test_error("setsockopt(TCP_AO)");
+
+ if (cnt_name)
+ before_cnt = netstat_get_one(cnt_name, NULL);
+
+ synchronize_threads(); /* preparations done */
+
+ timeout = fault(F_TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
+ err = test_wait_fd(lsk, timeout, 0);
+ if (err < 0)
+ test_error("test_wait_fd()");
+ else if (!err) {
+ if (!fault(F_TIMEOUT))
+ test_fail("timeouted for accept()");
+ } else {
+ if (fault(F_TIMEOUT))
+ test_fail("ready to accept");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0) {
+ test_error("accept()");
+ } else {
+ if (fault(F_TIMEOUT))
+ test_fail("%s: accepted", tst_name);
+ }
+ }
+
+ close(lsk);
+
+ if (!cnt_name)
+ goto out;
+
+ after_cnt = netstat_get_one(cnt_name, NULL);
+
+ if (after_cnt <= before_cnt) {
+ test_fail("%s: %s counter did not increase: %zu <= %zu",
+ tst_name, cnt_name, after_cnt, before_cnt);
+ } else {
+ test_ok("%s: counter %s increased %zu => %zu",
+ tst_name, cnt_name, before_cnt, after_cnt);
+ }
+
+out:
+ synchronize_threads(); /* close() */
+ if (sk > 0)
+ close(sk);
+}
+
+static void *server_fn(void *arg)
+{
+ union tcp_addr wrong_addr, network_addr;
+ unsigned int port = test_server_port;
+
+ if (inet_pton(TEST_FAMILY, TEST_WRONG_IP, &wrong_addr) != 1)
+ test_error("Can't convert ip address %s", TEST_WRONG_IP);
+
+ try_accept("Non-AO server + AO client", port++, NULL,
+ this_ip_dest, -1, 100, 100, "TCPAOKeyNotFound", F_TIMEOUT);
+
+ try_accept("AO server + Non-AO client", port++, "password",
+ this_ip_dest, -1, 100, 100, "TCPAORequired", F_TIMEOUT);
+
+ try_accept("Wrong password", port++, "password2",
+ this_ip_dest, -1, 100, 100, "TCPAOBad", F_TIMEOUT);
+
+ try_accept("Wrong rcv id", port++, "password",
+ this_ip_dest, -1, 100, 101, "TCPAOKeyNotFound", F_TIMEOUT);
+
+ try_accept("Wrong snd id", port++, "password",
+ this_ip_dest, -1, 101, 100, "TCPAOGood", F_TIMEOUT);
+
+ try_accept("Server: Wrong addr", port++, "password",
+ wrong_addr, -1, 100, 100, "TCPAOKeyNotFound", F_TIMEOUT);
+
+ try_accept("Client: Wrong addr", port++, NULL,
+ this_ip_dest, -1, 100, 100, NULL, F_TIMEOUT);
+
+ try_accept("rcv id != snd id", port++, "password",
+ this_ip_dest, -1, 200, 100, "TCPAOGood", 0);
+
+ if (inet_pton(TEST_FAMILY, TEST_NETWORK, &network_addr) != 1)
+ test_error("Can't convert ip address %s", TEST_NETWORK);
+
+ try_accept("Server: prefix match", port++, "password",
+ network_addr, 16, 100, 100, "TCPAOGood", 0);
+
+ try_accept("Client: prefix match", port++, "password",
+ this_ip_dest, -1, 100, 100, "TCPAOGood", 0);
+
+ /* client exits */
+ synchronize_threads();
+ return NULL;
+}
+
+static void try_connect(const char *tst_name, unsigned int port,
+ const char *pwd, union tcp_addr addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, fault_t inj)
+{
+ time_t timeout;
+ int sk, ret;
+
+ sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ if (sk < 0)
+ test_error("socket()");
+
+ if (pwd && test_set_ao(sk, pwd, 0, addr, prefix, sndid, rcvid))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads(); /* preparations done */
+
+ timeout = fault(F_TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
+ ret = _test_connect_socket(sk, this_ip_dest, port, timeout);
+
+ if (ret < 0) {
+ if (fault(F_KEYREJECT) && ret == -EKEYREJECTED) {
+ test_ok("%s: connect() was prevented", tst_name);
+ goto out;
+ } else if (ret == -ECONNREFUSED &&
+ (fault(F_TIMEOUT) || fault(F_KEYREJECT))) {
+ test_ok("%s: refused to connect", tst_name);
+ goto out;
+ } else {
+ test_error("%s: connect() returned %d", tst_name, ret);
+ }
+ }
+
+ if (ret == 0) {
+ if (fault(F_TIMEOUT))
+ test_ok("%s", tst_name);
+ else
+ test_fail("%s: failed to connect()", tst_name);
+ } else {
+ if (fault(F_TIMEOUT) || fault(F_KEYREJECT))
+ test_fail("%s: connected", tst_name);
+ else
+ test_ok("%s: connected", tst_name);
+ }
+
+out:
+ synchronize_threads(); /* close() */
+
+ if (ret > 0)
+ close(sk);
+}
+
+static void *client_fn(void *arg)
+{
+ union tcp_addr wrong_addr, network_addr;
+ unsigned int port = test_server_port;
+
+ if (inet_pton(TEST_FAMILY, TEST_WRONG_IP, &wrong_addr) != 1)
+ test_error("Can't convert ip address %s", TEST_WRONG_IP);
+
+ try_connect("Non-AO server + AO client", port++, "password",
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("AO server + Non-AO client", port++, NULL,
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("Wrong password", port++, "password",
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("Wrong rcv id", port++, "password",
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("Wrong snd id", port++, "password",
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("Server: Wrong addr", port++, "password",
+ this_ip_dest, -1, 100, 100, F_TIMEOUT);
+
+ try_connect("Client: Wrong addr", port++, "password",
+ wrong_addr, -1, 100, 100, F_KEYREJECT);
+
+ try_connect("rcv id != snd id", port++, "password",
+ this_ip_dest, -1, 100, 200, 0);
+
+ if (inet_pton(TEST_FAMILY, TEST_NETWORK, &network_addr) != 1)
+ test_error("Can't convert ip address %s", TEST_NETWORK);
+
+ try_connect("Server: prefix match", port++, "password",
+ this_ip_dest, -1, 100, 100, 0);
+
+ try_connect("Client: prefix match", port++, "password",
+ network_addr, 16, 100, 100, 0);
+
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(19, server_fn, client_fn);
+ return 0;
+}
--
2.38.1
Sample output:
> 1..36
> # 1106[lib/setup.c:207] rand seed 1660754406
> TAP version 13
> ok 1 Worst case connect 512 keys: min=0ms max=1ms mean=0.583329ms stddev=0.076376
> ok 2 Connect random-search 512 keys: min=0ms max=1ms mean=0.53412ms stddev=0.0516779
> ok 3 Worst case delete 512 keys: min=2ms max=11ms mean=6.04139ms stddev=0.245792
> ok 4 Add a new key 512 keys: min=0ms max=13ms mean=0.673415ms stddev=0.0820618
> ok 5 Remove random-search 512 keys: min=5ms max=9ms mean=6.65969ms stddev=0.258064
> ok 6 Remove async 512 keys: min=0ms max=0ms mean=0.041825ms stddev=0.0204512
> ok 7 Worst case connect 1024 keys: min=0ms max=2ms mean=0.520357ms stddev=0.0721358
> ok 8 Connect random-search 1024 keys: min=0ms max=2ms mean=0.535312ms stddev=0.0517355
> ok 9 Worst case delete 1024 keys: min=5ms max=9ms mean=8.27219ms stddev=0.287614
> ok 10 Add a new key 1024 keys: min=0ms max=1ms mean=0.688121ms stddev=0.0829531
> ok 11 Remove random-search 1024 keys: min=5ms max=9ms mean=8.37649ms stddev=0.289422
> ok 12 Remove async 1024 keys: min=0ms max=0ms mean=0.0457096ms stddev=0.0213798
> ok 13 Worst case connect 2048 keys: min=0ms max=2ms mean=0.748804ms stddev=0.0865335
> ok 14 Connect random-search 2048 keys: min=0ms max=2ms mean=0.782993ms stddev=0.0625697
> ok 15 Worst case delete 2048 keys: min=5ms max=10ms mean=8.23106ms stddev=0.286898
> ok 16 Add a new key 2048 keys: min=0ms max=1ms mean=0.812988ms stddev=0.0901658
> ok 17 Remove random-search 2048 keys: min=8ms max=9ms mean=8.84949ms stddev=0.297481
> ok 18 Remove async 2048 keys: min=0ms max=0ms mean=0.0297223ms stddev=0.0172402
> ok 19 Worst case connect 4096 keys: min=1ms max=5ms mean=1.53352ms stddev=0.123836
> ok 20 Connect random-search 4096 keys: min=1ms max=5ms mean=1.52226ms stddev=0.0872429
> ok 21 Worst case delete 4096 keys: min=5ms max=9ms mean=8.25874ms stddev=0.28738
> ok 22 Add a new key 4096 keys: min=0ms max=3ms mean=1.67382ms stddev=0.129376
> ok 23 Remove random-search 4096 keys: min=5ms max=10ms mean=8.26178ms stddev=0.287433
> ok 24 Remove async 4096 keys: min=0ms max=0ms mean=0.0340009ms stddev=0.0184393
> ok 25 Worst case connect 8192 keys: min=2ms max=4ms mean=2.86208ms stddev=0.169177
> ok 26 Connect random-search 8192 keys: min=2ms max=4ms mean=2.87592ms stddev=0.119915
> ok 27 Worst case delete 8192 keys: min=6ms max=11ms mean=7.55291ms stddev=0.274826
> ok 28 Add a new key 8192 keys: min=1ms max=5ms mean=2.56797ms stddev=0.160249
> ok 29 Remove random-search 8192 keys: min=5ms max=10ms mean=7.14002ms stddev=0.267208
> ok 30 Remove async 8192 keys: min=0ms max=0ms mean=0.0320066ms stddev=0.0178904
> ok 31 Worst case connect 16384 keys: min=5ms max=6ms mean=5.55334ms stddev=0.235655
> ok 32 Connect random-search 16384 keys: min=5ms max=6ms mean=5.52614ms stddev=0.166225
> ok 33 Worst case delete 16384 keys: min=5ms max=11ms mean=7.39109ms stddev=0.271866
> ok 34 Add a new key 16384 keys: min=2ms max=4ms mean=3.35799ms stddev=0.183248
> ok 35 Remove random-search 16384 keys: min=5ms max=8ms mean=6.86078ms stddev=0.261931
> ok 36 Remove async 16384 keys: min=0ms max=0ms mean=0.0302384ms stddev=0.0173892
> # Totals: pass:36 fail:0 xfail:0 xpass:0 skip:0 error:0
From it it's visible that the current simplified approach with
linked-list of MKTs scales quite fine even for thousands of keys.
And that also means that the majority of the time for delete is eaten by
synchronize_rcu() [which I can confirm separately by tracing].
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/tcp_ao/Makefile | 4 +-
.../selftests/net/tcp_ao/bench-lookups.c | 403 ++++++++++++++++++
2 files changed, 406 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/net/tcp_ao/bench-lookups.c
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
index da44966f3687..a4af7d4da169 100644
--- a/tools/testing/selftests/net/tcp_ao/Makefile
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
TEST_BOTH_AF := connect icmps-discard icmps-accept connect-deny \
- setsockopt-closed unsigned-md5
+ setsockopt-closed unsigned-md5 bench-lookups
TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
@@ -46,3 +46,5 @@ $(OUTPUT)/%_ipv6: %.c
$(OUTPUT)/icmps-accept_ipv4: CFLAGS+= -DTEST_ICMPS_ACCEPT
$(OUTPUT)/icmps-accept_ipv6: CFLAGS+= -DTEST_ICMPS_ACCEPT
+$(OUTPUT)/bench-lookups_ipv4: LDFLAGS+= -lm
+$(OUTPUT)/bench-lookups_ipv6: LDFLAGS+= -lm
diff --git a/tools/testing/selftests/net/tcp_ao/bench-lookups.c b/tools/testing/selftests/net/tcp_ao/bench-lookups.c
new file mode 100644
index 000000000000..41456d85e06a
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/bench-lookups.c
@@ -0,0 +1,403 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dmitry Safonov <[email protected]> */
+#include <arpa/inet.h>
+#include <inttypes.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "../../../../include/linux/bits.h"
+#include "../../../../include/linux/kernel.h"
+#include "aolib.h"
+
+#define AO_KEY_SZ 300 /* ~= sizeof(struct tcp_ao_key) */
+#define NR_ITERS 100 /* number of times to run gathering statistics */
+
+#ifdef IPV6_TEST
+typedef struct in6_addr ipaddr_t;
+static ipaddr_t get_ipaddr_t(ipaddr_t net, size_t n)
+{
+ ipaddr_t ret = net;
+
+ ret.s6_addr32[3] = htonl(n & (BIT(32) - 1));
+ ret.s6_addr32[2] = htonl((n >> 32) & (BIT(32) - 1));
+
+ return ret;
+}
+#else
+typedef struct in_addr ipaddr_t;
+static ipaddr_t get_ipaddr_t(ipaddr_t net, size_t n)
+{
+ ipaddr_t ret;
+
+ ret.s_addr = htonl(ntohl(net.s_addr) + n);
+ return ret;
+}
+#endif
+
+static void gen_test_ips(ipaddr_t *ips, size_t ips_nr, bool use_rand)
+{
+ ipaddr_t net;
+ size_t i, j;
+
+ if (inet_pton(TEST_FAMILY, TEST_NETWORK, &net) != 1)
+ test_error("Can't convert ip address %s", TEST_NETWORK);
+
+ if (!use_rand) {
+ for (i = 0; i < ips_nr; i++)
+ ips[i] = get_ipaddr_t(net, 2 * i + 1);
+ return;
+ }
+ for (i = 0; i < ips_nr; i++) {
+ size_t r = (size_t)random() | 0x1;
+
+ ips[i] = get_ipaddr_t(net, r);
+
+ for (j = i - 1; j > 0 && i > 0; j--) {
+ if (!memcmp(&ips[i], &ips[j], sizeof(ipaddr_t))) {
+ i--; /* collision */
+ break;
+ }
+ }
+ }
+}
+
+static void test_add_routes(ipaddr_t *ips, size_t ips_nr)
+{
+ size_t i;
+
+ for (i = 0; i < ips_nr; i++) {
+ union tcp_addr *p = (union tcp_addr *)&ips[i];
+
+ if (ip_route_add(veth_name, TEST_FAMILY, this_ip_addr, *p))
+ test_error("Failed to add route");
+ }
+}
+
+static void server_apply_keys(int lsk, ipaddr_t *ips, size_t ips_nr)
+{
+ size_t i;
+
+ for (i = 0; i < ips_nr; i++) {
+ union tcp_addr *p = (union tcp_addr *)&ips[i];
+
+ if (test_set_ao(lsk, "password", 0, *p, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+ }
+}
+
+static const size_t nr_keys[] = { 512, 1024, 2048, 4096, 8192, 16384 };
+static ipaddr_t *test_ips;
+
+struct bench_stats {
+ uint64_t min;
+ uint64_t max;
+ uint64_t nr;
+ double mean;
+ double s2;
+};
+
+static struct bench_tests {
+ struct bench_stats delete_last_key;
+ struct bench_stats add_key;
+ struct bench_stats delete_rand_key;
+ struct bench_stats connect_last_key;
+ struct bench_stats connect_rand_key;
+ struct bench_stats delete_async;
+} bench_results[ARRAY_SIZE(nr_keys)];
+
+#define NSEC_PER_SEC 1000000000ULL
+
+static void measure_call(struct bench_stats *st,
+ void (*f)(int, void *), int sk, void *arg)
+{
+ struct timespec start = {}, end = {};
+ double delta;
+ uint64_t nsec;
+
+ if (clock_gettime(CLOCK_MONOTONIC, &start))
+ test_error("clock_gettime()");
+
+ f(sk, arg);
+
+ if (clock_gettime(CLOCK_MONOTONIC, &end))
+ test_error("clock_gettime()");
+
+ nsec = (end.tv_sec - start.tv_sec) * NSEC_PER_SEC;
+ if (end.tv_nsec >= start.tv_nsec)
+ nsec += end.tv_nsec - start.tv_nsec;
+ else
+ nsec -= start.tv_nsec - end.tv_nsec;
+
+ if (st->nr == 0) {
+ st->min = st->max = nsec;
+ } else {
+ if (st->min > nsec)
+ st->min = nsec;
+ if (st->max < nsec)
+ st->max = nsec;
+ }
+
+ /* Welford-Knuth algorithm */
+ st->nr++;
+ delta = (double)nsec - st->mean;
+ st->mean += delta / st->nr;
+ st->s2 += delta * ((double)nsec - st->mean);
+}
+
+static void delete_mkt(int sk, void *arg)
+{
+ struct tcp_ao_del *ao = arg;
+
+ if (setsockopt(sk, IPPROTO_TCP, TCP_AO_DEL, ao, sizeof(*ao)))
+ test_error("setsockopt(TCP_AO_DEL)");
+}
+
+static void add_back_mkt(int sk, void *arg)
+{
+ union tcp_addr *p = arg;
+
+ if (test_set_ao(sk, "password", 0, *p, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+}
+
+static void memcpy_sockaddr(void *dest, union tcp_addr *in_addr)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = in_addr->a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = in_addr->a4,
+ };
+#endif
+
+ memcpy(dest, &addr, sizeof(addr));
+}
+
+static void bench_delete(int lsk, struct bench_stats *add,
+ struct bench_stats *del,
+ ipaddr_t *ips, size_t ips_nr,
+ bool rand_order, bool async)
+{
+ struct tcp_ao_del ao_del = {};
+ union tcp_addr *p;
+ size_t i;
+
+ ao_del.tcpa_sndid = 100;
+ ao_del.tcpa_rcvid = 100;
+ if (async)
+ ao_del.tcpa_flags = TCP_AO_CMDF_DEL_ASYNC;
+ ao_del.tcpa_prefix = DEFAULT_TEST_PREFIX;
+
+ /* Remove the first added */
+ p = (union tcp_addr *)&ips[0];
+ memcpy_sockaddr(&ao_del.tcpa_addr, p);
+
+ for (i = 0; i < NR_ITERS; i++) {
+ measure_call(del, delete_mkt, lsk, (void *)&ao_del);
+
+ /* Restore it back */
+ measure_call(add, add_back_mkt, lsk, (void *)p);
+
+ /*
+ * Slowest for FILO-linked-list:
+ * on (i) iteration removing ips[i] element. When it gets
+ * added to the list back - it becomes first to fetch, so
+ * on (i + 1) iteration go to ips[i + 1] element.
+ */
+ if (rand_order)
+ p = (union tcp_addr *)&ips[rand() % ips_nr];
+ else
+ p = (union tcp_addr *)&ips[i % ips_nr];
+ memcpy_sockaddr(&ao_del.tcpa_addr, p);
+ }
+}
+
+static void bench_connect_srv(int lsk, ipaddr_t *ips, size_t ips_nr)
+{
+ size_t i;
+
+ for (i = 0; i < NR_ITERS; i++) {
+ int err, sk;
+
+ synchronize_threads();
+
+ err = test_wait_fd(lsk, TEST_TIMEOUT_SEC, 0);
+ if (!err)
+ test_error("timeouted for accept()");
+ else if (err < 0)
+ test_error("test_wait_fd()");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0)
+ test_error("accept()");
+
+ close(sk);
+ }
+}
+
+static void test_print_stats(const char *desc, size_t nr, struct bench_stats *bs)
+{
+ test_ok("%20s\t%zu keys: min=%" PRIu64 "ms max=%" PRIu64 "ms mean=%gms stddev=%g",
+ desc, nr, bs->min / 1000000, bs->max / 1000000,
+ bs->mean / 1000000, sqrt((bs->mean / 1000000) / bs->nr));
+}
+
+static void *server_fn(void *arg)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(nr_keys); i++) {
+ struct bench_tests *bt = &bench_results[i];
+ int lsk;
+
+ test_ips = malloc(nr_keys[i] * sizeof(ipaddr_t));
+ if (!test_ips)
+ test_error("malloc()");
+
+ lsk = test_listen_socket(this_ip_addr, test_server_port + i, 1);
+
+ gen_test_ips(test_ips, nr_keys[i], false);
+ test_add_routes(test_ips, nr_keys[i]);
+ test_set_optmem(AO_KEY_SZ * nr_keys[i]);
+ server_apply_keys(lsk, test_ips, nr_keys[i]);
+
+ synchronize_threads();
+ bench_connect_srv(lsk, test_ips, nr_keys[i]);
+ bench_connect_srv(lsk, test_ips, nr_keys[i]);
+
+ /* The worst case for FILO-list */
+ bench_delete(lsk, &bt->add_key, &bt->delete_last_key,
+ test_ips, nr_keys[i], false, false);
+ test_print_stats("Worst case delete",
+ nr_keys[i], &bt->delete_last_key);
+ test_print_stats("Add a new key",
+ nr_keys[i], &bt->add_key);
+
+ bench_delete(lsk, &bt->add_key, &bt->delete_rand_key,
+ test_ips, nr_keys[i], true, false);
+ test_print_stats("Remove random-search",
+ nr_keys[i], &bt->delete_rand_key);
+
+ bench_delete(lsk, &bt->add_key, &bt->delete_async,
+ test_ips, nr_keys[i], false, true);
+ test_print_stats("Remove async", nr_keys[i], &bt->delete_async);
+
+ free(test_ips);
+ close(lsk);
+ }
+
+ return NULL;
+}
+
+static void connect_client(int sk, void *arg)
+{
+ size_t *p = arg;
+
+ if (test_connect_socket(sk, this_ip_dest, test_server_port + *p) <= 0)
+ test_error("failed to connect()");
+}
+
+static void client_addr_setup(int sk, union tcp_addr taddr)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = taddr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = taddr.a4,
+ };
+#endif
+ int ret;
+
+ ret = ip_addr_add(veth_name, TEST_FAMILY, taddr, TEST_PREFIX);
+ if (ret && ret != -EEXIST)
+ test_error("Failed to add ip address");
+ ret = ip_route_add(veth_name, TEST_FAMILY, taddr, this_ip_dest);
+ if (ret && ret != -EEXIST)
+ test_error("Failed to add route");
+
+ if (bind(sk, &addr, sizeof(addr)))
+ test_error("bind()");
+}
+
+static void bench_connect_client(size_t port_off, struct bench_tests *bt,
+ ipaddr_t *ips, size_t ips_nr, bool rand_order)
+{
+ struct bench_stats *con;
+ union tcp_addr *p;
+ size_t i;
+
+ if (rand_order)
+ con = &bt->connect_rand_key;
+ else
+ con = &bt->connect_last_key;
+
+ p = (union tcp_addr *)&ips[0];
+
+ for (i = 0; i < NR_ITERS; i++) {
+ int sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+
+ if (sk < 0)
+ test_error("socket()");
+
+ client_addr_setup(sk, *p);
+ if (test_set_ao(sk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads();
+
+ measure_call(con, connect_client, sk, (void *)&port_off);
+
+ close(sk);
+
+ /*
+ * Slowest for FILO-linked-list:
+ * on (i) iteration removing ips[i] element. When it gets
+ * added to the list back - it becomes first to fetch, so
+ * on (i + 1) iteration go to ips[i + 1] element.
+ */
+ if (rand_order)
+ p = (union tcp_addr *)&ips[rand() % ips_nr];
+ else
+ p = (union tcp_addr *)&ips[i % ips_nr];
+ }
+}
+
+static void *client_fn(void *arg)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(nr_keys); i++) {
+ struct bench_tests *bt = &bench_results[i];
+
+ synchronize_threads();
+ bench_connect_client(i, bt, test_ips, nr_keys[i], false);
+ test_print_stats("Worst case connect",
+ nr_keys[i], &bt->connect_last_key);
+
+ bench_connect_client(i, bt, test_ips, nr_keys[i], false);
+ test_print_stats("Connect random-search",
+ nr_keys[i], &bt->connect_last_key);
+ }
+ synchronize_threads();
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(36, server_fn, client_fn);
+ return 0;
+}
--
2.38.1
Roughly, the same as TCP-MD5 support.
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/nettest.c | 179 +++++++++++++++++++++++---
1 file changed, 160 insertions(+), 19 deletions(-)
diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c
index 3499d6aff9e4..c81d3e2ceae1 100644
--- a/tools/testing/selftests/net/nettest.c
+++ b/tools/testing/selftests/net/nettest.c
@@ -77,7 +77,9 @@ struct sock_args {
has_expected_laddr:1,
has_expected_raddr:1,
bind_test_only:1,
- use_md5:1;
+ use_md5:1,
+ use_tcpao:1,
+ tcp_ao_excopts:1;
unsigned short port;
@@ -96,7 +98,7 @@ struct sock_args {
const char *serverns;
const char *password;
- /* prefix for MD5 password */
+ /* prefix for MD5/TCP-AO password */
const char *auth_prefix_str;
union {
struct sockaddr_in v4;
@@ -105,6 +107,8 @@ struct sock_args {
unsigned int prefix_len;
/* 0: default, -1: force off, +1: force on */
int bind_key_ifindex;
+ unsigned int tcp_ao_sndid, tcp_ao_rcvid, tcp_ao_maclen;
+ char *tcp_ao_algo;
/* expected addresses and device index for connection */
const char *expected_dev;
@@ -300,7 +304,67 @@ static int tcp_md5sig(int sd, void *addr, socklen_t alen, struct sock_args *args
return rc;
}
-static int tcp_md5_remote(int sd, struct sock_args *args)
+static int tcp_ao(int sd, void *addr, socklen_t alen, struct sock_args *args)
+{
+ int keylen = strlen(args->password);
+ struct tcp_ao ao = {};
+ int opt = TCP_AO;
+ int rc;
+
+ if (keylen > TCP_AO_MAXKEYLEN) {
+ log_error("key length is too big");
+ return -1;
+ }
+ ao.tcpa_keylen = keylen;
+ memcpy(ao.tcpa_key, args->password, keylen);
+ if (args->tcp_ao_algo)
+ strcpy(ao.tcpa_alg_name, args->tcp_ao_algo);
+ else
+ strcpy(ao.tcpa_alg_name, "cmac(aes128)");
+ if (args->tcp_ao_maclen)
+ ao.tcpa_maclen = args->tcp_ao_maclen;
+
+ ao.tcpa_sndid = args->tcp_ao_sndid;
+ ao.tcpa_rcvid = args->tcp_ao_rcvid;
+ if (args->tcp_ao_excopts)
+ ao.tcpa_keyflags |= TCP_AO_KEYF_EXCLUDE_OPT;
+
+ if (args->prefix_len) {
+ ao.tcpa_prefix = args->prefix_len;
+ } else {
+ switch (args->version) {
+ case AF_INET:
+ ao.tcpa_prefix = 32;
+ break;
+ case AF_INET6:
+ ao.tcpa_prefix = 128;
+ break;
+ default:
+ log_error("unknown address family\n");
+ exit(1);
+ }
+ }
+ memcpy(&ao.tcpa_addr, addr, alen);
+
+ /* FIXME: Remove once matching by port is supported */
+ if (args->version == AF_INET) {
+ struct sockaddr_in *sin = (void *)&ao.tcpa_addr;
+
+ sin->sin_port = htons(0);
+ } else if (args->version == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (void *)&ao.tcpa_addr;
+
+ sin6->sin6_port = htons(0);
+ }
+
+ rc = setsockopt(sd, IPPROTO_TCP, opt, &ao, sizeof(ao));
+ if (rc < 0)
+ log_err_errno("setsockopt(TCP_AO)");
+
+ return rc;
+}
+
+static int tcp_auth_remote(int sd, struct sock_args *args)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
@@ -329,7 +393,10 @@ static int tcp_md5_remote(int sd, struct sock_args *args)
exit(1);
}
- if (tcp_md5sig(sd, addr, alen, args))
+ if (args->use_md5 && tcp_md5sig(sd, addr, alen, args))
+ return -1;
+
+ if (args->use_tcpao && tcp_ao(sd, addr, alen, args))
return -1;
return 0;
@@ -1546,10 +1613,8 @@ static int do_server(struct sock_args *args, int ipc_fd)
return rc;
}
- if (args->use_md5 && tcp_md5_remote(lsd, args)) {
- close(lsd);
- goto err_exit;
- }
+ if (tcp_auth_remote(lsd, args))
+ goto err_close;
ipc_write(ipc_fd, 1);
while (1) {
@@ -1598,6 +1663,8 @@ static int do_server(struct sock_args *args, int ipc_fd)
close(lsd);
return rc;
+err_close:
+ close(lsd);
err_exit:
ipc_write(ipc_fd, 0);
return 1;
@@ -1673,6 +1740,9 @@ static int connectsock(void *addr, socklen_t alen, struct sock_args *args)
if (args->use_md5 && tcp_md5sig(sd, addr, alen, args))
goto err;
+ if (args->use_tcpao && tcp_ao(sd, addr, alen, args))
+ goto err;
+
if (args->bind_test_only)
goto out;
@@ -1799,6 +1869,44 @@ static char *random_msg(int len)
return m;
}
+static void strip_newlines(char *str)
+{
+ size_t i = strlen(str);
+
+ for (; i > 0; i--) {
+ if (str[i - 1] != '\n')
+ return;
+ str[i - 1] = '\0';
+ }
+}
+
+static int set_tcp_ao_param(struct sock_args *args, const char *opt)
+{
+ char *end, *sep = strstr(opt, ":");
+ unsigned long tmp;
+
+ errno = 0;
+ if (sep == NULL)
+ goto err_fail;
+
+ tmp = strtoul(opt, &end, 0);
+ if (errno || tmp > 255 || end != sep)
+ goto err_fail;
+ args->tcp_ao_sndid = (unsigned int) tmp;
+
+ tmp = strtoul(++sep, &end, 0);
+ if (errno || tmp > 255 || (*end != '\n' && *end != '\0'))
+ goto err_fail;
+ args->tcp_ao_rcvid = (unsigned int) tmp;
+
+ return 0;
+
+err_fail:
+ fprintf(stderr, "TCP-AO argument format is sndid:rcvid where ids in [0,255]\n"
+ "Example: -T 100:200\n");
+ return -1;
+}
+
static int ipc_child(int fd, struct sock_args *args)
{
char *outbuf, *errbuf;
@@ -1860,13 +1968,19 @@ static int ipc_parent(int cpid, int fd, struct sock_args *args)
return client_status;
}
-#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:MX:m:d:I:BN:O:SUCi6xL:0:1:2:3:Fbqf"
-#define OPT_FORCE_BIND_KEY_IFINDEX 1001
-#define OPT_NO_BIND_KEY_IFINDEX 1002
+#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:MT:X:m:d:I:BN:O:SUCi6xL:0:1:2:3:Fbqf"
+#define OPT_FORCE_BIND_KEY_IFINDEX 1001
+#define OPT_NO_BIND_KEY_IFINDEX 1002
+#define OPT_TCPAO_ALGO 1003
+#define OPT_TCPAO_MACLEN 1004
+#define OPT_TCPAO_EXCOPTS 1005
static struct option long_opts[] = {
- {"force-bind-key-ifindex", 0, 0, OPT_FORCE_BIND_KEY_IFINDEX},
- {"no-bind-key-ifindex", 0, 0, OPT_NO_BIND_KEY_IFINDEX},
+ {"force-bind-key-ifindex", 0, 0, OPT_FORCE_BIND_KEY_IFINDEX},
+ {"no-bind-key-ifindex", 0, 0, OPT_NO_BIND_KEY_IFINDEX},
+ {"tcpao_algo", 1, 0, OPT_TCPAO_ALGO },
+ {"tcpao_maclen", 1, 0, OPT_TCPAO_MACLEN },
+ {"tcpao_excopts", 0, 0, OPT_TCPAO_EXCOPTS },
{0, 0, 0, 0}
};
@@ -1905,8 +2019,12 @@ static void print_usage(char *prog)
" -n num number of times to send message\n"
"\n"
" -M use MD5 sum protection\n"
- " -X password MD5 password\n"
- " -m prefix/len prefix and length to use for MD5 key\n"
+ " -T snd:rcvid use TCP authopt (RFC5925) with snd/rcv ids\n"
+ " --tcpao_algo=algo TCP-AO hashing algorithm [valid with -T]\n"
+ " --tcpao_maclen=maclen TCP-AO MAC length [valid with -T]\n"
+ " --tcpao_excopts Exclude TCP options [valid with -T]\n"
+ " -X password MD5/TCP-AO password\n"
+ " -m prefix/len prefix and length to use for MD5/TCP-AO key\n"
" --no-bind-key-ifindex: Force TCP_MD5SIG_FLAG_IFINDEX off\n"
" --force-bind-key-ifindex: Force TCP_MD5SIG_FLAG_IFINDEX on\n"
" (default: only if -I is passed)\n"
@@ -2025,6 +2143,29 @@ int main(int argc, char *argv[])
case OPT_NO_BIND_KEY_IFINDEX:
args.bind_key_ifindex = -1;
break;
+ case OPT_TCPAO_ALGO:
+ args.tcp_ao_algo = strdup(optarg);
+ strip_newlines(args.tcp_ao_algo);
+ if (strlen(args.tcp_ao_algo) == 0) {
+ fprintf(stderr, "Invalid argument --tcpao_algo=%s\n", optarg);
+ return 1;
+ }
+ break;
+ case OPT_TCPAO_MACLEN:
+ if (str_to_uint(optarg, 1, 255, &tmp) != 0) {
+ fprintf(stderr, "Invalid --tcpao_maclen=%s\n", optarg);
+ return 1;
+ }
+ args.tcp_ao_maclen = tmp;
+ break;
+ case OPT_TCPAO_EXCOPTS:
+ args.tcp_ao_excopts = 1;
+ break;
+ case 'T':
+ args.use_tcpao = 1;
+ if (set_tcp_ao_param(&args, optarg))
+ return 1;
+ break;
case 'X':
args.password = optarg;
break;
@@ -2090,15 +2231,15 @@ int main(int argc, char *argv[])
}
}
- if (args.password && (!args.use_md5 ||
+ if (args.password && ((!args.use_md5 && !args.use_tcpao) ||
(!args.has_remote_ip && !args.auth_prefix_str) ||
args.type != SOCK_STREAM)) {
- log_error("MD5 passwords apply to TCP only and require a remote ip for the password\n");
+ log_error("TCP-MD5/TCP-AO passwords apply to TCP only and require a remote ip for the password\n");
return 1;
}
- if ((args.auth_prefix_str || args.use_md5) && !args.password) {
- log_error("Prefix range for MD5 protection specified without a password\n");
+ if ((args.auth_prefix_str || args.use_md5 || args.use_tcpao) && !args.password) {
+ log_error("Prefix range for TCP-MD5/TCP-AO protection specified without a password\n");
return 1;
}
--
2.38.1
Now it's going to be used for TCP-AO testing too.
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/nettest.c | 28 +++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c
index b9e600899cf6..3499d6aff9e4 100644
--- a/tools/testing/selftests/net/nettest.c
+++ b/tools/testing/selftests/net/nettest.c
@@ -97,11 +97,11 @@ struct sock_args {
const char *password;
/* prefix for MD5 password */
- const char *md5_prefix_str;
+ const char *auth_prefix_str;
union {
struct sockaddr_in v4;
struct sockaddr_in6 v6;
- } md5_prefix;
+ } auth_prefix;
unsigned int prefix_len;
/* 0: default, -1: force off, +1: force on */
int bind_key_ifindex;
@@ -274,7 +274,7 @@ static int tcp_md5sig(int sd, void *addr, socklen_t alen, struct sock_args *args
md5sig.tcpm_flags |= TCP_MD5SIG_FLAG_PREFIX;
md5sig.tcpm_prefixlen = args->prefix_len;
- addr = &args->md5_prefix;
+ addr = &args->auth_prefix;
}
memcpy(&md5sig.tcpm_addr, addr, alen);
@@ -314,13 +314,13 @@ static int tcp_md5_remote(int sd, struct sock_args *args)
switch (args->version) {
case AF_INET:
sin.sin_port = htons(args->port);
- sin.sin_addr = args->md5_prefix.v4.sin_addr;
+ sin.sin_addr = args->auth_prefix.v4.sin_addr;
addr = &sin;
alen = sizeof(sin);
break;
case AF_INET6:
sin6.sin6_port = htons(args->port);
- sin6.sin6_addr = args->md5_prefix.v6.sin6_addr;
+ sin6.sin6_addr = args->auth_prefix.v6.sin6_addr;
addr = &sin6;
alen = sizeof(sin6);
break;
@@ -753,11 +753,11 @@ static int convert_addr(struct sock_args *args, const char *_str,
case ADDR_TYPE_MD5_PREFIX:
desc = "md5 prefix";
if (family == AF_INET) {
- args->md5_prefix.v4.sin_family = AF_INET;
- addr = &args->md5_prefix.v4.sin_addr;
+ args->auth_prefix.v4.sin_family = AF_INET;
+ addr = &args->auth_prefix.v4.sin_addr;
} else if (family == AF_INET6) {
- args->md5_prefix.v6.sin6_family = AF_INET6;
- addr = &args->md5_prefix.v6.sin6_addr;
+ args->auth_prefix.v6.sin6_family = AF_INET6;
+ addr = &args->auth_prefix.v6.sin6_addr;
} else
return 1;
@@ -840,8 +840,8 @@ static int validate_addresses(struct sock_args *args)
convert_addr(args, args->remote_addr_str, ADDR_TYPE_REMOTE) < 0)
return 1;
- if (args->md5_prefix_str &&
- convert_addr(args, args->md5_prefix_str,
+ if (args->auth_prefix_str &&
+ convert_addr(args, args->auth_prefix_str,
ADDR_TYPE_MD5_PREFIX) < 0)
return 1;
@@ -2029,7 +2029,7 @@ int main(int argc, char *argv[])
args.password = optarg;
break;
case 'm':
- args.md5_prefix_str = optarg;
+ args.auth_prefix_str = optarg;
break;
case 'S':
args.use_setsockopt = 1;
@@ -2091,13 +2091,13 @@ int main(int argc, char *argv[])
}
if (args.password && (!args.use_md5 ||
- (!args.has_remote_ip && !args.md5_prefix_str) ||
+ (!args.has_remote_ip && !args.auth_prefix_str) ||
args.type != SOCK_STREAM)) {
log_error("MD5 passwords apply to TCP only and require a remote ip for the password\n");
return 1;
}
- if ((args.md5_prefix_str || args.use_md5) && !args.password) {
+ if ((args.auth_prefix_str || args.use_md5) && !args.password) {
log_error("Prefix range for MD5 protection specified without a password\n");
return 1;
}
--
2.38.1
These are basic TCP-AO functionality tests, more detailed coverage with
functional testing is done by selftests/net/tcp_ao library and binaries.
Sample output:
> TEST: Global server - ns-A IP [ OK ]
> TEST: Global server - ns-A loopback IP [ OK ]
> TEST: Device server - ns-A IP [ OK ]
> TEST: No server - ns-A IP [ OK ]
> TEST: No server - ns-A loopback IP [ OK ]
> TEST: Client - ns-B IP [ OK ]
> TEST: Client, device bind - ns-B IP [ OK ]
> TEST: No server, unbound client - ns-B IP [ OK ]
> TEST: No server, device client - ns-B IP [ OK ]
> TEST: Client - ns-B loopback IP [ OK ]
> TEST: Client, device bind - ns-B loopback IP [ OK ]
> TEST: No server, unbound client - ns-B loopback IP [ OK ]
> TEST: No server, device client - ns-B loopback IP [ OK ]
> TEST: Global server, local connection - ns-A IP [ OK ]
> TEST: Global server, local connection - ns-A loopback IP [ OK ]
> TEST: Global server, local connection - loopback [ OK ]
> TEST: Device server, unbound client, local connection - ns-A IP [ OK ]
> TEST: Device server, unbound client, local connection - ns-A loopback IP [ OK ]
> TEST: Device server, unbound client, local connection - loopback [ OK ]
> TEST: Global server, device client, local connection - ns-A IP [ OK ]
> TEST: Global server, device client, local connection - ns-A loopback IP [ OK ]
> TEST: Global server, device client, local connection - loopback [ OK ]
> TEST: Device server, device client, local connection - ns-A IP [ OK ]
> TEST: No server, device client, local conn - ns-A IP [ OK ]
> TEST: MD5: Single address config [ OK ]
> TEST: MD5: Server no config, client uses password [ OK ]
> TEST: MD5: Client uses wrong password [ OK ]
> TEST: MD5: Client address does not match address configured with password [ OK ]
> TEST: MD5: Prefix config [ OK ]
> TEST: MD5: Prefix config, client uses wrong password [ OK ]
> TEST: MD5: Prefix config, client address not in configured prefix [ OK ]
> TEST: TCP-AO [hmac(sha1):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha1):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha1):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [cmac(aes128):12]: Single address config [ OK ]
> TEST: TCP-AO [cmac(aes128):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [cmac(aes128):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(rmd160):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(rmd160):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(rmd160):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha512):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha512):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha512):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha384):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha384):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha384):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha256):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha256):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha256):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(md5):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(md5):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(md5):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha224):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha224):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha224):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha3-512):12]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha3-512):12]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha3-512):12]: Client uses wrong password [ OK ]
> TEST: TCP-AO: Client address does not match address configured with password [ OK ]
> TEST: TCP-AO: Prefix config [ OK ]
> TEST: TCP-AO: Prefix config, client uses wrong password [ OK ]
> TEST: TCP-AO: Prefix config, client address not in configured prefix [ OK ]
> TEST: TCP-AO: Different key ids [ OK ]
> TEST: TCP-AO: Wrong keyid [ OK ]
> TEST: TCP-AO [cmac(aes128):16]: Single address config [ OK ]
> TEST: TCP-AO [cmac(aes128):16]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [cmac(aes128):16]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha1):16]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha1):16]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha1):16]: Client uses wrong password [ OK ]
> TEST: TCP-AO [cmac(aes128):4]: Single address config [ OK ]
> TEST: TCP-AO [cmac(aes128):4]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [cmac(aes128):4]: Client uses wrong password [ OK ]
> TEST: TCP-AO [hmac(sha1):4]: Single address config [ OK ]
> TEST: TCP-AO [hmac(sha1):4]: Server no config, client uses password [ OK ]
> TEST: TCP-AO [hmac(sha1):4]: Client uses wrong password [ OK ]
> TEST: TCP-AO: add MD5 and TCP-AO for the same peer address [ OK ]
> TEST: TCP-AO: MD5 and TCP-AO on connect() [ OK ]
> TEST: TCP-AO: Exclude TCP options [ OK ]
Signed-off-by: Dmitry Safonov <[email protected]>
---
tools/testing/selftests/net/fcnal-test.sh | 239 ++++++++++++++++++++++
1 file changed, 239 insertions(+)
diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index d4516c755858..95718516b234 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -76,6 +76,12 @@ BCAST_IP=255.255.255.255
MD5_PW=abc123
MD5_WRONG_PW=abc1234
+AO_PW=abc123
+AO_WRONG_PW=abc1234
+AO_HASH_ALGOS="hmac(sha1) cmac(aes128)"
+AO_HASH_ALGOS+=" hmac(rmd160) hmac(sha512)"
+AO_HASH_ALGOS+=" hmac(sha384) hmac(sha256) hmac(md5)"
+AO_HASH_ALGOS+=" hmac(sha224) hmac(sha3-512)"
MCAST=ff02::1
# set after namespace create
@@ -900,6 +906,123 @@ ipv4_tcp_md5_novrf()
log_test $? 2 "MD5: Prefix config, client address not in configured prefix"
}
+#
+# TCP-AO tests without VRF
+#
+ipv4_tcp_ao_algos()
+{
+ # basic use case
+ log_start
+ run_cmd nettest -s -T 100:100 --tcpao_algo=$1 --tcpao_maclen=$2 \
+ -X ${AO_PW} -m ${NSB_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_PW}
+ log_test $? 0 "TCP-AO [$1:$2]: Single address config"
+
+ # client sends TCP-AO, server not configured
+ log_start
+ show_hint "Should timeout due to TCP-AO password mismatch"
+ run_cmd nettest -s &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_PW}
+ log_test $? 2 "TCP-AO [$1:$2]: Server no config, client uses password"
+
+ # wrong password
+ log_start
+ show_hint "Should timeout since client uses wrong password"
+ run_cmd nettest -s -T 100:100 --tcpao_algo=$1 --tcpao_maclen=$2 \
+ -X ${AO_PW} -m ${NSB_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_WRONG_PW}
+ log_test $? 2 "TCP-AO [$1:$2]: Client uses wrong password"
+}
+
+ipv4_tcp_ao_novrf()
+{
+ #
+ # single address
+ #
+ for i in $AO_HASH_ALGOS ; do
+ ipv4_tcp_ao_algos $i 12
+ done
+
+ # client from different address
+ log_start
+ show_hint "Should timeout due to TCP-AO address mismatch"
+ run_cmd nettest -s -T 100:100 -X ${AO_PW} -m ${NSB_LO_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Client address does not match address configured with password"
+
+ # client in prefix
+ log_start
+ run_cmd nettest -s -T 100:100 -X ${AO_PW} -m ${NS_NET} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 -X ${AO_PW}
+ log_test $? 0 "TCP-AO: Prefix config"
+
+ # client in prefix, wrong password
+ log_start
+ show_hint "Should timeout since client uses wrong password"
+ run_cmd nettest -s -T 100:100 -X ${AO_PW} -m ${NS_NET} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 -X ${AO_WRONG_PW}
+ log_test $? 2 "TCP-AO: Prefix config, client uses wrong password"
+
+ # client outside of prefix
+ log_start
+ show_hint "Should timeout due to address out of TCP-AO prefix mismatch"
+ run_cmd nettest -s -T 100:100 -X ${AO_PW} -m ${NS_NET} &
+ sleep 1
+ run_cmd_nsb nettest -c ${NSB_LO_IP} -r ${NSA_IP} -T 100:100 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Prefix config, client address not in configured prefix"
+
+ # TCP-AO more specific tests
+ # sendid != rcvid
+ log_start
+ run_cmd nettest -s -T 100:101 -X ${AO_PW} -m ${NSB_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 101:100 -X ${AO_PW}
+ log_test $? 0 "TCP-AO: Different key ids"
+
+ # Wrong keyid
+ log_start
+ show_hint "Should timeout due to a wrong keyid"
+ run_cmd nettest -s -T 100:100 -X ${AO_PW} -m ${NSB_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 101:101 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Wrong keyid"
+
+ # Variable maclen
+ ipv4_tcp_ao_algos "cmac(aes128)" 16
+ ipv4_tcp_ao_algos "hmac(sha1)" 16
+ ipv4_tcp_ao_algos "cmac(aes128)" 4
+ ipv4_tcp_ao_algos "hmac(sha1)" 4
+
+ # MD5 and TCP-AO for the same peer
+ log_start
+ run_cmd nettest -s -T 100:100 -M -X ${AO_PW} -m ${NSB_IP}
+ log_test $? 1 "TCP-AO: add MD5 and TCP-AO for the same peer address"
+
+ # Connect with both TCP-AO and MD5 on the socket
+ log_start
+ show_hint "Should fail to connect with both MD5 and TCP-AO on the socket"
+ run_cmd nettest -s -T 100:100 -M -X ${AO_PW} -m ${NSB_IP} &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 100:100 -M -X ${AO_PW}
+ log_test $? 1 "TCP-AO: MD5 and TCP-AO on connect()"
+
+ # Exclude TCP options
+ log_start
+ run_cmd nettest -s -T 100:101 -X ${AO_PW} -m ${NSB_IP} --tcpao_excopts &
+ sleep 1
+ run_cmd_nsb nettest -r ${NSA_IP} -T 101:100 -X ${AO_PW} --tcpao_excopts
+ log_test $? 0 "TCP-AO: Exclude TCP options"
+}
+
#
# MD5 tests with VRF
#
@@ -1217,6 +1340,7 @@ ipv4_tcp_novrf()
log_test_addr ${a} $? 1 "No server, device client, local conn"
ipv4_tcp_md5_novrf
+ ipv4_tcp_ao_novrf
}
ipv4_tcp_vrf()
@@ -2511,6 +2635,120 @@ ipv6_tcp_md5_novrf()
log_test $? 2 "MD5: Prefix config, client address not in configured prefix"
}
+ipv6_tcp_ao_algos()
+{
+ # basic use case
+ log_start
+ run_cmd nettest -6 -s -T 100:100 --tcpao_algo=$1 --tcpao_maclen=$2 \
+ -X ${AO_PW} -m ${NSB_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_PW}
+ log_test $? 0 "TCP-AO [$1:$2]: Single address config"
+
+ # client sends TCP-AO, server not configured
+ log_start
+ show_hint "Should timeout since server does not have TCP-AO auth"
+ run_cmd nettest -6 -s &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_PW}
+ log_test $? 2 "TCP-AO [$1:$2]: Server no config, client uses password"
+
+ # wrong password
+ log_start
+ show_hint "Should timeout since client uses wrong password"
+ run_cmd nettest -6 -s -T 100:100 --tcpao_algo=$1 --tcpao_maclen=$2 \
+ -X ${AO_PW} -m ${NSB_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 --tcpao_algo=$1 \
+ --tcpao_maclen=$2 -X ${AO_WRONG_PW}
+ log_test $? 2 "TCP-AO [$1:$2]: Client uses wrong password"
+}
+
+ipv6_tcp_ao_novrf()
+{
+ #
+ # single address
+ #
+ for i in $AO_HASH_ALGOS ; do
+ ipv6_tcp_ao_algos $i 12
+ done
+
+ # client from different address
+ log_start
+ show_hint "Should timeout since server config differs from client"
+ run_cmd nettest -6 -s -T 100:100 -X ${AO_PW} -m ${NSB_LO_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Client address does not match address configured with password"
+
+ # client in prefix
+ log_start
+ run_cmd nettest -6 -s -T 100:100 -X ${AO_PW} -m ${NS_NET6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 -X ${AO_PW}
+ log_test $? 0 "TCP-AO: Prefix config"
+
+ # client in prefix, wrong password
+ log_start
+ show_hint "Should timeout since client uses wrong password"
+ run_cmd nettest -6 -s -T 100:100 -X ${AO_PW} -m ${NS_NET6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 -X ${AO_WRONG_PW}
+ log_test $? 2 "TCP-AO: Prefix config, client uses wrong password"
+
+ # client outside of prefix
+ log_start
+ show_hint "Should timeout since client address is outside of prefix"
+ run_cmd nettest -6 -s -T 100:100 -X ${AO_PW} -m ${NS_NET6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -c ${NSB_LO_IP6} -r ${NSA_IP6} -T 100:100 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Prefix config, client address not in configured prefix"
+
+ # TCP-AO more specific tests
+ # sendid != rcvid
+ log_start
+ run_cmd nettest -6 -s -T 100:101 -X ${AO_PW} -m ${NSB_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 101:100 -X ${AO_PW}
+ log_test $? 0 "TCP-AO: Different key ids"
+
+ # Wrong keyid
+ log_start
+ show_hint "Should timeout due to a wrong keyid"
+ run_cmd nettest -6 -s -T 100:100 -X ${AO_PW} -m ${NSB_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 101:101 -X ${AO_PW}
+ log_test $? 2 "TCP-AO: Wrong keyid"
+
+ # Variable maclen
+ ipv6_tcp_ao_algos "cmac(aes128)" 16
+ ipv6_tcp_ao_algos "hmac(sha1)" 16
+ ipv6_tcp_ao_algos "cmac(aes128)" 4
+ ipv6_tcp_ao_algos "hmac(sha1)" 4
+
+ # MD5 and TCP-AO for the same peer
+ log_start
+ run_cmd nettest -6 -s -T 100:100 -M -X ${AO_PW} -m ${NSB_IP6}
+ log_test $? 1 "TCP-AO: add MD5 and TCP-AO for the same peer address"
+
+ # Connect with both TCP-AO and MD5 on the socket
+ log_start
+ show_hint "Should fail to connect with both MD5 and TCP-AO on the socket"
+ run_cmd nettest -6 -s -T 100:100 -M -X ${AO_PW} -m ${NSB_IP6} &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 100:100 -M -X ${AO_PW}
+ log_test $? 1 "TCP-AO: MD5 and TCP-AO on connect()"
+
+ # Exclude TCP options
+ log_start
+ run_cmd nettest -6 -s -T 100:101 -X ${AO_PW} -m ${NSB_IP6} --tcpao_excopts &
+ sleep 1
+ run_cmd_nsb nettest -6 -r ${NSA_IP6} -T 101:100 -X ${AO_PW} --tcpao_excopts
+ log_test $? 0 "TCP-AO: Exclude TCP options"
+}
+
#
# MD5 tests with VRF
#
@@ -2773,6 +3011,7 @@ ipv6_tcp_novrf()
done
ipv6_tcp_md5_novrf
+ ipv6_tcp_ao_novrf
}
ipv6_tcp_vrf()
--
2.38.1
Hi Dmitry,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on 4dc12f37a8e98e1dca5521c14625c869537b50b6]
url: https://github.com/intel-lab-lkp/linux/commits/Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20221028-045452
base: 4dc12f37a8e98e1dca5521c14625c869537b50b6
patch link: https://lore.kernel.org/r/20221027204347.529913-18-dima%40arista.com
patch subject: [PATCH v3 17/36] net/tcp: Verify inbound TCP-AO signed segments
config: x86_64-randconfig-a005
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/f735fab5365661e9531aa2d77f5bf959d347dd21
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20221028-045452
git checkout f735fab5365661e9531aa2d77f5bf959d347dd21
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash net/ipv4/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> net/ipv4/tcp_ao.c:800:14: warning: variable 'sisn' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
} else if (unlikely(th->ack && !th->syn)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:48:23: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_ao.c:819:46: note: uninitialized use occurs here
ops->ao_calc_key_skb(key, traffic_key, skb, sisn, disn);
^~~~
net/ipv4/tcp_ao.c:800:10: note: remove the 'if' if its condition is always true
} else if (unlikely(th->ack && !th->syn)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_ao.c:727:13: note: initialize the variable 'sisn' to silence this warning
__be32 sisn, disn;
^
= 0
>> net/ipv4/tcp_ao.c:800:14: warning: variable 'disn' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
} else if (unlikely(th->ack && !th->syn)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:48:23: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_ao.c:819:52: note: uninitialized use occurs here
ops->ao_calc_key_skb(key, traffic_key, skb, sisn, disn);
^~~~
net/ipv4/tcp_ao.c:800:10: note: remove the 'if' if its condition is always true
} else if (unlikely(th->ack && !th->syn)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_ao.c:727:19: note: initialize the variable 'disn' to silence this warning
__be32 sisn, disn;
^
= 0
2 warnings generated.
vim +800 net/ipv4/tcp_ao.c
715
716 enum skb_drop_reason
717 tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
718 unsigned short int family, const struct request_sock *req,
719 const struct tcp_ao_hdr *aoh)
720 {
721 const struct tcp_sock_af_ops *ops = tcp_sk(sk)->af_specific;
722 u8 key_buf[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align;
723 const struct tcphdr *th = tcp_hdr(skb);
724 u8 *phash = (u8 *)(aoh + 1); /* hash goes just after the header */
725 struct tcp_ao_info *info;
726 struct tcp_ao_key *key;
727 __be32 sisn, disn;
728 u8 *traffic_key;
729 u32 sne = 0;
730
731 info = rcu_dereference(tcp_sk(sk)->ao_info);
732 if (!info)
733 return SKB_DROP_REASON_TCP_AOUNEXPECTED;
734
735 /* Fast-path */
736 /* TODO: fix fastopen and simultaneous open (TCPF_SYN_RECV) */
737 if (likely((1 << sk->sk_state) & (TCP_AO_ESTABLISHED | TCPF_SYN_RECV))) {
738 enum skb_drop_reason err;
739
740 /* Check if this socket's rnext_key matches the keyid in the
741 * packet. If not we lookup the key based on the keyid
742 * matching the rcvid in the mkt.
743 */
744 key = info->rnext_key;
745 if (key->rcvid != aoh->keyid) {
746 key = tcp_ao_do_lookup_rcvid(sk, aoh->keyid);
747 if (!key)
748 goto key_not_found;
749 }
750
751 if (unlikely(th->syn && !th->ack)) {
752 /* Delayed retransmitted syn */
753 sisn = th->seq;
754 disn = 0;
755 goto verify_hash;
756 }
757
758 sne = tcp_ao_compute_sne(info->rcv_sne, info->rcv_sne_seq,
759 ntohl(th->seq));
760 /* Established socket, traffic key are cached */
761 traffic_key = rcv_other_key(key);
762 err = tcp_ao_verify_hash(sk, skb, family, info, aoh, key,
763 traffic_key, phash, sne);
764 if (err)
765 return err;
766 /* Key rotation: the peer asks us to use new key (RNext) */
767 if (unlikely(aoh->rnext_keyid != info->current_key->sndid)) {
768 /* If the key is not found we do nothing. */
769 key = tcp_ao_do_lookup_sndid(sk, aoh->rnext_keyid);
770 if (key)
771 /* pairs with tcp_ao_del_cmd */
772 WRITE_ONCE(info->current_key, key);
773 }
774 return SKB_NOT_DROPPED_YET;
775 }
776
777 /* Lookup key based on peer address and keyid.
778 * current_key and rnext_key must not be used on tcp listen
779 * sockets as otherwise:
780 * - request sockets would race on those key pointers
781 * - tcp_ao_del_cmd() allows async key removal
782 */
783 key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid);
784 if (!key)
785 goto key_not_found;
786
787 if (th->syn && !th->ack) {
788 sisn = th->seq;
789 disn = 0;
790 goto verify_hash;
791 }
792
793 if (sk->sk_state == TCP_LISTEN) {
794 /* Make the initial syn the likely case here */
795 if (unlikely(req)) {
796 sne = tcp_ao_compute_sne(0, tcp_rsk(req)->rcv_isn,
797 ntohl(th->seq));
798 sisn = htonl(tcp_rsk(req)->rcv_isn);
799 disn = htonl(tcp_rsk(req)->snt_isn);
> 800 } else if (unlikely(th->ack && !th->syn)) {
801 /* Possible syncookie packet */
802 sisn = htonl(ntohl(th->seq) - 1);
803 disn = htonl(ntohl(th->ack_seq) - 1);
804 sne = tcp_ao_compute_sne(0, ntohl(sisn),
805 ntohl(th->seq));
806 }
807 } else if (sk->sk_state == TCP_SYN_SENT) {
808 disn = info->lisn;
809 if (th->syn)
810 sisn = th->seq;
811 else
812 sisn = info->risn;
813 } else {
814 WARN_ONCE(1, "TCP-AO: Unknown sk_state %d", sk->sk_state);
815 return SKB_DROP_REASON_TCP_AOFAILURE;
816 }
817 verify_hash:
818 traffic_key = key_buf;
819 ops->ao_calc_key_skb(key, traffic_key, skb, sisn, disn);
820 return tcp_ao_verify_hash(sk, skb, family, info, aoh, key,
821 traffic_key, phash, sne);
822
823 key_not_found:
824 return SKB_DROP_REASON_TCP_AOKEYNOTFOUND;
825 }
826
--
0-DAY CI Kernel Test Service
https://01.org/lkp
Hi Dmitry,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on 4dc12f37a8e98e1dca5521c14625c869537b50b6]
url: https://github.com/intel-lab-lkp/linux/commits/Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20221028-045452
base: 4dc12f37a8e98e1dca5521c14625c869537b50b6
patch link: https://lore.kernel.org/r/20221027204347.529913-11-dima%40arista.com
patch subject: [PATCH v3 10/36] net/tcp: Calculate TCP-AO traffic keys
config: sparc-allyesconfig
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/980990bf961b835d23f7518aa5af1ee3c742f64d
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Dmitry-Safonov/net-tcp-Add-TCP-AO-support/20221028-045452
git checkout 980990bf961b835d23f7518aa5af1ee3c742f64d
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash net/ipv6/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> net/ipv6/tcp_ao.c:16:5: warning: no previous prototype for 'tcp_v6_ao_calc_key' [-Wmissing-prototypes]
16 | int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
| ^~~~~~~~~~~~~~~~~~
net/ipv6/tcp_ao.c:56:20: warning: no previous prototype for 'tcp_v6_ao_do_lookup' [-Wmissing-prototypes]
56 | struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk,
| ^~~~~~~~~~~~~~~~~~~
vim +/tcp_v6_ao_calc_key +16 net/ipv6/tcp_ao.c
15
> 16 int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
17 const struct in6_addr *saddr,
18 const struct in6_addr *daddr,
19 __be16 sport, __be16 dport,
20 __be32 sisn, __be32 disn)
21 {
22 struct kdf_input_block {
23 u8 counter;
24 u8 label[6];
25 struct tcp6_ao_context ctx;
26 __be16 outlen;
27 } __packed tmp;
28
29 tmp.counter = 1;
30 memcpy(tmp.label, "TCP-AO", 6);
31 tmp.ctx.saddr = *saddr;
32 tmp.ctx.daddr = *daddr;
33 tmp.ctx.sport = sport;
34 tmp.ctx.dport = dport;
35 tmp.ctx.sisn = sisn;
36 tmp.ctx.disn = disn;
37 tmp.outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */
38
39 return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp));
40 }
41
--
0-DAY CI Kernel Test Service
https://01.org/lkp
Thinking about how to move the TCP-AO intent forward: clearly a 36-patch
set is a bit much. The first 6 patches are prep work, and we know there
is a use case for those.
We could handle patches 3 and 4 as a stand alone set first.
Once merged, deal with the crypto API and users until those maintainers
are good. That would be patches 1, 2, 5 and 6.
Once those are merged it drops down to just networking patches with
selftests. Those can be split into AO (19) and selftests (11) making it
4 total sets of manageable size.
The AO patches can be reviewed until convergence on a good starting point.
Sound reasonable?
Hi David,
On 11/1/22 02:22, David Ahern wrote:
> Thinking about how to move the TCP-AO intent forward: clearly a 36-patch
> set is a bit much. The first 6 patches are prep work, and we know there
> is a use case for those.
>
> We could handle patches 3 and 4 as a stand alone set first.
>
> Once merged, deal with the crypto API and users until those maintainers
> are good. That would be patches 1, 2, 5 and 6.
>
> Once those are merged it drops down to just networking patches with
> selftests. Those can be split into AO (19) and selftests (11) making it
> 4 total sets of manageable size.
>
> The AO patches can be reviewed until convergence on a good starting point.
>
> Sound reasonable?
That sounds reasonable to me.
I'll submit patches 3 & 4 for review and then, once merged, 1, 2, 5 and
6. And later (re)-base TCP-AO on linux-next.
Thanks,
Dmitry