3.16.74-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Yu Wang <yyuwang@xxxxxxxxxxxxxx>
commit 79c92ca42b5a3e0ea172ea2ce8df8e125af237da upstream.
When receiving a deauthentication/disassociation frame from a TDLS
peer, a station should not disconnect the current AP, but only
disable the current TDLS link if it's enabled.
Without this change, a TDLS issue can be reproduced by following the
steps as below:
1. STA-1 and STA-2 are connected to AP, bidirection traffic is running
between STA-1 and STA-2.
2. Set up TDLS link between STA-1 and STA-2, stay for a while, then
teardown TDLS link.
3. Repeat step #2 and monitor the connection between STA and AP.
During the test, one STA may send a deauthentication/disassociation
frame to another, after TDLS teardown, with reason code 6/7, which
means: Class 2/3 frame received from nonassociated STA.
On receive this frame, the receiver STA will disconnect the current
AP and then reconnect. It's not a expected behavior, purpose of this
frame should be disabling the TDLS link, not the link with AP.
Signed-off-by: Yu Wang <yyuwang@xxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
[bwh: Backported to 3.16:
- Initialise reason_code earlier in ieee80211_rx_mgmt_deauth()
- Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1858,6 +1858,9 @@ int ieee80211_tdls_mgmt(struct wiphy *wi
const u8 *extra_ies, size_t extra_ies_len);
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, enum nl80211_tdls_operation oper);
+void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
+ const u8 *peer, u16 reason);
+const char *ieee80211_get_reason_code_string(u16 reason_code);
#ifdef CONFIG_MAC80211_NOINLINE
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2298,7 +2298,7 @@ static void ieee80211_rx_mgmt_auth(struc
#define case_WLAN(type) \
case WLAN_REASON_##type: return #type
-static const char *ieee80211_get_reason_code_string(u16 reason_code)
+const char *ieee80211_get_reason_code_string(u16 reason_code)
{
switch (reason_code) {
case_WLAN(UNSPECIFIED);
@@ -2357,21 +2357,24 @@ static void ieee80211_rx_mgmt_deauth(str
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *bssid = NULL;
- u16 reason_code;
+ u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
sdata_assert_lock(sdata);
if (len < 24 + 2)
return;
+ if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
+ ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
+ return;
+ }
+
if (!ifmgd->associated ||
!ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
return;
bssid = ifmgd->associated->bssid;
- reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
-
sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
@@ -2398,6 +2401,11 @@ static void ieee80211_rx_mgmt_disassoc(s
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
+ if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
+ ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
+ return;
+ }
+
sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
mgmt->sa, reason_code);
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -340,3 +340,26 @@ void ieee80211_tdls_oper_request(struct
cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
}
EXPORT_SYMBOL(ieee80211_tdls_oper_request);
+
+void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
+ const u8 *peer, u16 reason)
+{
+ struct ieee80211_sta *sta;
+
+ rcu_read_lock();
+ sta = ieee80211_find_sta(&sdata->vif, peer);
+ if (!sta || !sta->tdls) {
+ rcu_read_unlock();
+ return;
+ }
+ rcu_read_unlock();
+
+ tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n",
+ peer, reason,
+ ieee80211_get_reason_code_string(reason));
+
+ ieee80211_tdls_oper_request(&sdata->vif, peer,
+ NL80211_TDLS_TEARDOWN,
+ WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE,
+ GFP_ATOMIC);
+}
