This patch is a prerequisite for handling preauth frames
over nl80211 control port correctly in ap mode.
Signed-off-by: Markus Theil <[email protected]>
---
include/uapi/linux/nl80211.h | 6 ++++++
net/wireless/nl80211.c | 2 ++
2 files changed, 8 insertions(+)
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 341e0e8cae46..c284bd828669 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2400,6 +2400,9 @@ enum nl80211_commands {
* @NL80211_ATTR_VLAN_ID: VLAN ID (1..4094) for the station and VLAN group key
* (u16).
*
+ * @NL80211_ATTR_SRC_MAC: MAC address used in control port over nl80211 transmit
+ * @NL80211_ATTR_DST_MAC: MAC address used in control port over nl80211 receive
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2864,6 +2867,9 @@ enum nl80211_attrs {
NL80211_ATTR_VLAN_ID,
+ NL80211_ATTR_SRC_MAC,
+ NL80211_ATTR_DST_MAC,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index fa3526592c51..467a48b818f9 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -625,6 +625,8 @@ const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_TWT_RESPONDER] = { .type = NLA_FLAG },
[NL80211_ATTR_HE_OBSS_PD] = NLA_POLICY_NESTED(he_obss_pd_policy),
[NL80211_ATTR_VLAN_ID] = NLA_POLICY_RANGE(NLA_U16, 1, VLAN_N_VID - 2),
+ [NL80211_ATTR_SRC_MAC] = NLA_POLICY_ETH_ADDR,
+ [NL80211_ATTR_DST_MAC] = NLA_POLICY_ETH_ADDR,
};
/* policy for the key attributes */
--
2.24.1
When using control port over nl80211 in AP mode with
pre-authentication, APs need to forward frames to other
APs defined by their MAC address. Before this patch,
pre-auth frames reaching user space over nl80211 control
port have no longer any information about the dest attached,
which can be used for forwarding to a controller or injecting
the frame back to a ethernet interface over a AF_PACKET
socket.
Analog problems exist, when forwarding pre-auth frames from
AP -> STA.
This patch therefore uses the NL80211_ATTR_DST_MAC and
NL80211_ATTR_SRC_MAC attributes to provide more context
information when forwarding.
The respective arguments are optional on tx and included on rx.
Therefore unaware existing software is not affected.
Signed-off-by: Markus Theil <[email protected]>
---
include/net/cfg80211.h | 3 ++-
include/uapi/linux/nl80211.h | 5 ++++-
net/mac80211/ieee80211_i.h | 3 ++-
net/mac80211/tx.c | 5 +++--
net/wireless/nl80211.c | 16 +++++++++++++---
net/wireless/rdev-ops.h | 8 ++++----
net/wireless/trace.h | 27 +++++++++++++++++----------
7 files changed, 45 insertions(+), 22 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 059524b87c4c..d8e7310d712a 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3939,7 +3939,8 @@ struct cfg80211_ops {
int (*tx_control_port)(struct wiphy *wiphy,
struct net_device *dev,
const u8 *buf, size_t len,
- const u8 *dest, const __be16 proto,
+ const u8 *dest, const u8 *src,
+ const __be16 proto,
const bool noencrypt);
int (*get_ftm_responder_stats)(struct wiphy *wiphy,
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index c284bd828669..fea0b34b0dd2 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1039,11 +1039,14 @@
* a control port frame and as a notification that a control port frame
* has been received. %NL80211_ATTR_FRAME is used to specify the
* frame contents. The frame is the raw EAPoL data, without ethernet or
- * 802.11 headers.
+ * 802.11 headers. An optional %NL80211_ATTR_SRC_MAC can be used to send
+ * pre-auth frames to STAs on behalf of other APs.
* When used as an event indication %NL80211_ATTR_CONTROL_PORT_ETHERTYPE,
* %NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT and %NL80211_ATTR_MAC are added
* indicating the protocol type of the received frame; whether the frame
* was received unencrypted and the MAC address of the peer respectively.
+ * %NL80211_ATTR_DST_MAC can be used to forward pre-auth frames in
+ * userspace while using AP mode.
*
* @NL80211_CMD_RELOAD_REGDB: Request that the regdb firmware file is reloaded.
*
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index e3cf24cb4615..e485a7528678 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1786,7 +1786,8 @@ void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata);
void ieee80211_clear_fast_xmit(struct sta_info *sta);
int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
const u8 *buf, size_t len,
- const u8 *dest, __be16 proto, bool unencrypted);
+ const u8 *dest, const u8 *src, __be16 proto,
+ bool unencrypted);
int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
const u8 *buf, size_t len);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index b31b5078f656..1872d0d13c2d 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -5276,7 +5276,8 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
const u8 *buf, size_t len,
- const u8 *dest, __be16 proto, bool unencrypted)
+ const u8 *dest, const u8 *src, __be16 proto,
+ bool unencrypted)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
@@ -5307,7 +5308,7 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
ehdr = skb_push(skb, sizeof(struct ethhdr));
memcpy(ehdr->h_dest, dest, ETH_ALEN);
- memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
+ memcpy(ehdr->h_source, src, ETH_ALEN);
ehdr->h_proto = proto;
skb->dev = dev;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 467a48b818f9..42c27ac7742b 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -13609,6 +13609,7 @@ static int nl80211_tx_control_port(struct sk_buff *skb, struct genl_info *info)
const u8 *buf;
size_t len;
u8 *dest;
+ u8 src[ETH_ALEN];
u16 proto;
bool noencrypt;
int err;
@@ -13646,6 +13647,13 @@ static int nl80211_tx_control_port(struct sk_buff *skb, struct genl_info *info)
goto out;
}
+ /* copy src address under wdev_lock, as we may copy wdev_address */
+ if (info->attrs[NL80211_ATTR_SRC_MAC])
+ ether_addr_copy(src,
+ nla_data(info->attrs[NL80211_ATTR_SRC_MAC]));
+ else
+ ether_addr_copy(src, wdev_address(wdev));
+
wdev_unlock(wdev);
buf = nla_data(info->attrs[NL80211_ATTR_FRAME]);
@@ -13656,7 +13664,7 @@ static int nl80211_tx_control_port(struct sk_buff *skb, struct genl_info *info)
nla_get_flag(info->attrs[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT]);
return rdev_tx_control_port(rdev, dev, buf, len,
- dest, cpu_to_be16(proto), noencrypt);
+ dest, src, cpu_to_be16(proto), noencrypt);
out:
wdev_unlock(wdev);
@@ -15911,7 +15919,8 @@ static int __nl80211_rx_control_port(struct net_device *dev,
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct ethhdr *ehdr = eth_hdr(skb);
- const u8 *addr = ehdr->h_source;
+ const u8 *daddr = ehdr->h_dest;
+ const u8 *saddr = ehdr->h_source;
u16 proto = be16_to_cpu(skb->protocol);
struct sk_buff *msg;
void *hdr;
@@ -15936,7 +15945,8 @@ static int __nl80211_rx_control_port(struct net_device *dev,
nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
NL80211_ATTR_PAD) ||
- nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, addr) ||
+ nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, saddr) ||
+ nla_put(msg, NL80211_ATTR_DST_MAC, ETH_ALEN, daddr) ||
nla_put_u16(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE, proto) ||
(unencrypted && nla_put_flag(msg,
NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT)))
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index e853a4fe6f97..39e6c1db3092 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -730,14 +730,14 @@ static inline int rdev_mgmt_tx(struct cfg80211_registered_device *rdev,
static inline int rdev_tx_control_port(struct cfg80211_registered_device *rdev,
struct net_device *dev,
const void *buf, size_t len,
- const u8 *dest, __be16 proto,
- const bool noencrypt)
+ const u8 *dest, const u8 *src,
+ __be16 proto, const bool noencrypt)
{
int ret;
trace_rdev_tx_control_port(&rdev->wiphy, dev, buf, len,
- dest, proto, noencrypt);
+ dest, src, proto, noencrypt);
ret = rdev->ops->tx_control_port(&rdev->wiphy, dev, buf, len,
- dest, proto, noencrypt);
+ dest, src, proto, noencrypt);
trace_rdev_return_int(&rdev->wiphy, ret);
return ret;
}
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index d98ad2b3143b..fefa255fd062 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -1923,27 +1923,31 @@ TRACE_EVENT(rdev_mgmt_tx,
TRACE_EVENT(rdev_tx_control_port,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,
- const u8 *buf, size_t len, const u8 *dest, __be16 proto,
+ const u8 *buf, size_t len,
+ const u8 *dest, const u8 *src, __be16 proto,
bool unencrypted),
- TP_ARGS(wiphy, netdev, buf, len, dest, proto, unencrypted),
+ TP_ARGS(wiphy, netdev, buf, len, dest, src, proto, unencrypted),
TP_STRUCT__entry(
WIPHY_ENTRY
NETDEV_ENTRY
MAC_ENTRY(dest)
- __field(__be16, proto)
+ MAC_ENTRY(src)
+ __field(u16, proto)
__field(bool, unencrypted)
),
TP_fast_assign(
WIPHY_ASSIGN;
NETDEV_ASSIGN;
MAC_ASSIGN(dest, dest);
- __entry->proto = proto;
+ MAC_ASSIGN(src, src);
+ __entry->proto = be16_to_cpu(proto);
__entry->unencrypted = unencrypted;
),
- TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", " MAC_PR_FMT ","
- " proto: 0x%x, unencrypted: %s",
- WIPHY_PR_ARG, NETDEV_PR_ARG, MAC_PR_ARG(dest),
- be16_to_cpu(__entry->proto),
+ TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", dest: " MAC_PR_FMT
+ ", src: " MAC_PR_FMT ", proto: 0x%x, unencrypted: %s",
+ WIPHY_PR_ARG, NETDEV_PR_ARG,
+ MAC_PR_ARG(dest), MAC_PR_ARG(src),
+ __entry->proto,
BOOL_TO_STR(__entry->unencrypted))
);
@@ -2835,6 +2839,7 @@ TRACE_EVENT(cfg80211_rx_control_port,
TP_STRUCT__entry(
NETDEV_ENTRY
__field(int, len)
+ MAC_ENTRY(to)
MAC_ENTRY(from)
__field(u16, proto)
__field(bool, unencrypted)
@@ -2842,12 +2847,14 @@ TRACE_EVENT(cfg80211_rx_control_port,
TP_fast_assign(
NETDEV_ASSIGN;
__entry->len = skb->len;
+ MAC_ASSIGN(to, eth_hdr(skb)->h_dest);
MAC_ASSIGN(from, eth_hdr(skb)->h_source);
__entry->proto = be16_to_cpu(skb->protocol);
__entry->unencrypted = unencrypted;
),
- TP_printk(NETDEV_PR_FMT ", len=%d, " MAC_PR_FMT ", proto: 0x%x, unencrypted: %s",
- NETDEV_PR_ARG, __entry->len, MAC_PR_ARG(from),
+ TP_printk(NETDEV_PR_FMT ", len=%d, dest: " MAC_PR_FMT
+ ", src: " MAC_PR_FMT ", proto: 0x%x, unencrypted: %s",
+ NETDEV_PR_ARG, __entry->len, MAC_PR_ARG(to), MAC_PR_ARG(from),
__entry->proto, BOOL_TO_STR(__entry->unencrypted))
);
--
2.24.1
Hi Markus,
First, I think you should squash these two patches, there's no point in
adding unused attributes :-)
> The respective arguments are optional on tx and included on rx.
> Therefore unaware existing software is not affected.
This may be true, but doesn't *new* hostapd have to know that this is
supported, or otherwise fall back to sending the frames as data frames?
Seems to me a (driver) capability for this is needed.
johannes
On 1/15/20 12:30 PM, Johannes Berg wrote:
> Hi Markus,
>
> First, I think you should squash these two patches, there's no point in
> adding unused attributes :-)
Ok.
>> The respective arguments are optional on tx and included on rx.
>> Therefore unaware existing software is not affected.
> This may be true, but doesn't *new* hostapd have to know that this is
> supported, or otherwise fall back to sending the frames as data frames?
>
> Seems to me a (driver) capability for this is needed.
Sounds good and would make a clean detection in hostapd possible.
I'll update my patch.
Markus
> johannes
>