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mac80211: handle deauthentication/disassociation from TDLS peer 

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.

Cc: stable@vger.kernel.org
Signed-off-by: Yu Wang <yyuwang@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Yu Wang 2019-05-10 17:04:52 +08:00 committed by Johannes Berg
parent 32b5a2c995
commit 79c92ca42b
3 changed files with 37 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/mac80211/ieee80211_i.h
View File

@ -2225,6 +2225,9 @@ void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
const u8 *addr);
void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata);
void ieee80211_tdls_chsw_work(struct work_struct *wk);
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);
extern const struct ethtool_ops ieee80211_ethtool_ops;

12
net/mac80211/mlme.c
View File

@ -2963,7 +2963,7 @@ static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
#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);
@ -3028,6 +3028,11 @@ static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *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)) {
const u8 *bssid = ifmgd->associated->bssid;
@ -3077,6 +3082,11 @@ static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
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=%s)\n",
mgmt->sa, reason_code,
ieee80211_get_reason_code_string(reason_code));

23
net/mac80211/tdls.c
View File

@ -1994,3 +1994,26 @@ void ieee80211_tdls_chsw_work(struct work_struct *wk)
}
rtnl_unlock();
}
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);
}