wifi: mac80211: remove TDLS peers only on affected link

If a link does CSA, or if it changes SMPS mode, we need to
drop the TDLS peers, but we really should drop them only on
the affected link. Fix that.
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Link: https://msgid.link/20240228095719.00d1d793f5b8.Ia9971316c6b3922dd371d64ac2198f91ed5ad9d2@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -3242,7 +3242,7 @@ int __ieee80211_request_smps_mgd(struct ieee80211_sub_if_data *sdata,
 	if (err)
 		link->u.mgd.req_smps = old_req;
 	else if (smps_mode != IEEE80211_SMPS_OFF && tdls_peer_found)
-		ieee80211_teardown_tdls_peers(sdata);
+		ieee80211_teardown_tdls_peers(link);
 
 	return err;
 }

net/mac80211/ieee80211_i.h

@@ -2611,7 +2611,7 @@ int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
 					  struct net_device *dev,
 					  const u8 *addr);
-void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata);
+void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link);
 void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata,
 				      const u8 *peer, u16 reason);
 void

net/mac80211/mlme.c

@@ -2115,12 +2115,13 @@ ieee80211_sta_process_chanswitch(struct ieee80211_link_data *link,
 	}
 
 	/*
-	 * Drop all TDLS peers - either we disconnect or move to a different
-	 * channel from this point on. There's no telling what our peer will do.
+	 * Drop all TDLS peers on the affected link - either we disconnect or
+	 * move to a different channel from this point on. There's no telling
+	 * what our peer will do.
 	 * The TDLS WIDER_BW scenario is also problematic, as peers might now
 	 * have an incompatible wider chandef.
 	 */
-	ieee80211_teardown_tdls_peers(sdata);
+	ieee80211_teardown_tdls_peers(link);
 
 	conf = rcu_dereference_protected(link->conf->chanctx_conf,
 					 lockdep_is_held(&local->hw.wiphy->mtx));

net/mac80211/tdls.c

@@ -2028,8 +2028,9 @@ ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
 	}
 }
 
-void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
+void ieee80211_teardown_tdls_peers(struct ieee80211_link_data *link)
 {
+	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct sta_info *sta;
 	u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
 
@@ -2039,6 +2040,9 @@ void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
 		    !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
 			continue;
 
+		if (sta->deflink.link_id != link->link_id)
+			continue;
+
 		ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
 					    NL80211_TDLS_TEARDOWN, reason,
 					    GFP_ATOMIC);