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From: Dmitry Safonov via B4 Relay <devnull+0x7f454c46.gmail.com@kernel.org>
Date: Fri, 07 Jun 2024 00:25:57 +0100
Subject: [PATCH net-next v4 3/6] net/tcp: Move tcp_inbound_hash() from
 headers
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Message-Id: <20240607-tcp_ao-tracepoints-v4-3-88dc245c1f39@gmail.com>
References: <20240607-tcp_ao-tracepoints-v4-0-88dc245c1f39@gmail.com>
In-Reply-To: <20240607-tcp_ao-tracepoints-v4-0-88dc245c1f39@gmail.com>
To: Eric Dumazet <edumazet@google.com>, 
 "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, David Ahern <dsahern@kernel.org>, 
 Steven Rostedt <rostedt@goodmis.org>, 
 Masami Hiramatsu <mhiramat@kernel.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, 
 Jonathan Corbet <corbet@lwn.net>
Cc: Mohammad Nassiri <mnassiri@ciena.com>, Simon Horman <horms@kernel.org>, 
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, 
 Dmitry Safonov <0x7f454c46@gmail.com>
Reply-To: 0x7f454c46@gmail.com

From: Dmitry Safonov <0x7f454c46@gmail.com>

Two reasons:
1. It's grown up enough
2. In order to not do header spaghetti by including
   <trace/events/tcp.h>, which is necessary for TCP tracepoints.

While at it, unexport and make static tcp_inbound_ao_hash().

Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
---
 include/net/tcp.h | 78 +++----------------------------------------------------
 net/ipv4/tcp.c    | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 76 insertions(+), 76 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index e5427b05129b..2aac11e7e1cc 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1863,12 +1863,6 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk,
 	return __tcp_md5_do_lookup(sk, 0, addr, family, true);
 }
 
-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 l3index, const __u8 *hash_location);
-
-
 #define tcp_twsk_md5_key(twsk)	((twsk)->tw_md5_key)
 #else
 static inline struct tcp_md5sig_key *
@@ -1885,13 +1879,6 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk,
 	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,
-		     int family, int l3index, const __u8 *hash_location)
-{
-	return SKB_NOT_DROPPED_YET;
-}
 #define tcp_twsk_md5_key(twsk)	NULL
 #endif
 
@@ -2806,66 +2793,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
 	return false;
 }
 
-/* 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)) {
-		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) {
-			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
-			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
-	 * 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.
-		 */
-		if (tcp_ao_required(sk, saddr, family, l3index, true)) {
-			tcp_hash_fail("AO hash is required, but not found",
-					family, skb, "L3 index %d", l3index);
-			return SKB_DROP_REASON_TCP_AONOTFOUND;
-		}
-		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, "L3 index %d", l3index);
-			return SKB_DROP_REASON_TCP_MD5NOTFOUND;
-		}
-		return SKB_NOT_DROPPED_YET;
-	}
-
-	if (aoh)
-		return tcp_inbound_ao_hash(sk, skb, family, req, l3index, aoh);
-
-	return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family,
-				    l3index, md5_location);
-}
+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);
 
 #endif	/* _TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6553221694ec..17a4a8e4855d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4463,7 +4463,7 @@ int tcp_md5_hash_key(struct tcp_sigpool *hp,
 EXPORT_SYMBOL(tcp_md5_hash_key);
 
 /* Called with rcu_read_lock() */
-enum skb_drop_reason
+static 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 l3index, const __u8 *hash_location)
@@ -4517,10 +4517,80 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
 	}
 	return SKB_NOT_DROPPED_YET;
 }
-EXPORT_SYMBOL(tcp_inbound_md5_hash);
+#else
+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 l3index, const __u8 *hash_location)
+{
+	return SKB_NOT_DROPPED_YET;
+}
 
 #endif
 
+/* Called with rcu_read_lock() */
+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)) {
+		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) {
+			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+			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
+	 * 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.
+		 */
+		if (tcp_ao_required(sk, saddr, family, l3index, true)) {
+			tcp_hash_fail("AO hash is required, but not found",
+				      family, skb, "L3 index %d", l3index);
+			return SKB_DROP_REASON_TCP_AONOTFOUND;
+		}
+		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, "L3 index %d", l3index);
+			return SKB_DROP_REASON_TCP_MD5NOTFOUND;
+		}
+		return SKB_NOT_DROPPED_YET;
+	}
+
+	if (aoh)
+		return tcp_inbound_ao_hash(sk, skb, family, req, l3index, aoh);
+
+	return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family,
+				    l3index, md5_location);
+}
+EXPORT_SYMBOL_GPL(tcp_inbound_hash);
+
 void tcp_done(struct sock *sk)
 {
 	struct request_sock *req;

-- 
2.42.0