| From 79c92ca42b5a3e0ea172ea2ce8df8e125af237da Mon Sep 17 00:00:00 2001 |
| From: Yu Wang <yyuwang@codeaurora.org> |
| Date: Fri, 10 May 2019 17:04:52 +0800 |
| Subject: mac80211: handle deauthentication/disassociation from TDLS peer |
| |
| From: Yu Wang <yyuwang@codeaurora.org> |
| |
| 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. |
| |
| Cc: stable@vger.kernel.org |
| Signed-off-by: Yu Wang <yyuwang@codeaurora.org> |
| Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| net/mac80211/ieee80211_i.h | 3 +++ |
| net/mac80211/mlme.c | 12 +++++++++++- |
| net/mac80211/tdls.c | 23 +++++++++++++++++++++++ |
| 3 files changed, 37 insertions(+), 1 deletion(-) |
| |
| --- a/net/mac80211/ieee80211_i.h |
| +++ b/net/mac80211/ieee80211_i.h |
| @@ -2150,6 +2150,9 @@ void ieee80211_tdls_cancel_channel_switc |
| 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; |
| |
| --- a/net/mac80211/mlme.c |
| +++ b/net/mac80211/mlme.c |
| @@ -2744,7 +2744,7 @@ 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); |
| @@ -2809,6 +2809,11 @@ static void ieee80211_rx_mgmt_deauth(str |
| 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; |
| @@ -2858,6 +2863,11 @@ 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=%s)\n", |
| mgmt->sa, reason_code, |
| ieee80211_get_reason_code_string(reason_code)); |
| --- a/net/mac80211/tdls.c |
| +++ b/net/mac80211/tdls.c |
| @@ -1988,3 +1988,26 @@ void ieee80211_tdls_chsw_work(struct wor |
| } |
| 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); |
| +} |