1 files changed, 258 insertions, 147 deletions

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index d5e904bff624..95b58c5cac07 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -80,7 +80,7 @@ void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
 {
 	if (__ieee80211_recalc_txpower(sdata) ||
 	    (update_bss && ieee80211_sdata_running(sdata)))
-		ieee80211_link_info_change_notify(sdata, 0,
+		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
 						  BSS_CHANGED_TXPOWER);
 }
 
@@ -368,6 +368,246 @@ static int ieee80211_open(struct net_device *dev)
 	return err;
 }
 
+static void ieee80211_link_setup(struct ieee80211_link_data *link)
+{
+	if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
+		ieee80211_mgd_setup_link(link);
+}
+
+static void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
+				int link_id,
+				struct ieee80211_link_data *link,
+				struct ieee80211_bss_conf *link_conf)
+{
+	bool deflink = link_id < 0;
+
+	if (link_id < 0)
+		link_id = 0;
+
+	rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
+	rcu_assign_pointer(sdata->link[link_id], link);
+
+	link->sdata = sdata;
+	link->link_id = link_id;
+	link->conf = link_conf;
+	link_conf->link_id = link_id;
+
+	INIT_WORK(&link->csa_finalize_work,
+		  ieee80211_csa_finalize_work);
+	INIT_WORK(&link->color_change_finalize_work,
+		  ieee80211_color_change_finalize_work);
+	INIT_LIST_HEAD(&link->assigned_chanctx_list);
+	INIT_LIST_HEAD(&link->reserved_chanctx_list);
+	INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
+			  ieee80211_dfs_cac_timer_work);
+
+	if (!deflink) {
+		switch (sdata->vif.type) {
+		case NL80211_IFTYPE_AP:
+			ether_addr_copy(link_conf->addr,
+					sdata->wdev.links[link_id].addr);
+			WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
+			break;
+		case NL80211_IFTYPE_STATION:
+			break;
+		default:
+			WARN_ON(1);
+		}
+	}
+}
+
+static void ieee80211_link_stop(struct ieee80211_link_data *link)
+{
+	if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
+		ieee80211_mgd_stop_link(link);
+
+	ieee80211_link_release_channel(link);
+}
+
+struct link_container {
+	struct ieee80211_link_data data;
+	struct ieee80211_bss_conf conf;
+};
+
+static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
+				 struct link_container **links)
+{
+	unsigned int link_id;
+
+	synchronize_rcu();
+
+	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+		if (!links[link_id])
+			continue;
+		ieee80211_link_stop(&links[link_id]->data);
+		kfree(links[link_id]);
+	}
+}
+
+static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
+{
+	unsigned int i, j;
+
+	for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
+		struct ieee80211_link_data *link1;
+
+		link1 = sdata_dereference(sdata->link[i], sdata);
+		if (!link1)
+			continue;
+		for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
+			struct ieee80211_link_data *link2;
+
+			link2 = sdata_dereference(sdata->link[j], sdata);
+			if (!link2)
+				continue;
+
+			if (ether_addr_equal(link1->conf->addr,
+					     link2->conf->addr))
+				return -EALREADY;
+		}
+	}
+
+	return 0;
+}
+
+static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
+				      struct link_container **to_free,
+				      u16 new_links)
+{
+	u16 old_links = sdata->vif.valid_links;
+	unsigned long add = new_links & ~old_links;
+	unsigned long rem = old_links & ~new_links;
+	unsigned int link_id;
+	int ret;
+	struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
+	struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
+	struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
+	bool use_deflink = old_links == 0; /* set for error case */
+
+	sdata_assert_lock(sdata);
+
+	memset(to_free, 0, sizeof(links));
+
+	if (old_links == new_links)
+		return 0;
+
+	/* if there were no old links, need to clear the pointers to deflink */
+	if (!old_links)
+		rem |= BIT(0);
+
+	/* allocate new link structures first */
+	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
+		link = kzalloc(sizeof(*link), GFP_KERNEL);
+		if (!link) {
+			ret = -ENOMEM;
+			goto free;
+		}
+		links[link_id] = link;
+	}
+
+	/* keep track of the old pointers for the driver */
+	BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
+	memcpy(old, sdata->vif.link_conf, sizeof(old));
+	/* and for us in error cases */
+	BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
+	memcpy(old_data, sdata->link, sizeof(old_data));
+
+	/* grab old links to free later */
+	for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
+		if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
+			/*
+			 * we must have allocated the data through this path so
+			 * we know we can free both at the same time
+			 */
+			to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
+							typeof(*links[link_id]),
+							data);
+		}
+
+		RCU_INIT_POINTER(sdata->link[link_id], NULL);
+		RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
+	}
+
+	/* link them into data structures */
+	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
+		WARN_ON(!use_deflink &&
+			rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
+
+		link = links[link_id];
+		ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
+		ieee80211_link_setup(&link->data);
+	}
+
+	if (new_links == 0)
+		ieee80211_link_init(sdata, -1, &sdata->deflink,
+				    &sdata->vif.bss_conf);
+
+	sdata->vif.valid_links = new_links;
+
+	ret = ieee80211_check_dup_link_addrs(sdata);
+	if (!ret) {
+		/* tell the driver */
+		ret = drv_change_vif_links(sdata->local, sdata,
+					   old_links, new_links,
+					   old);
+	}
+
+	if (ret) {
+		/* restore config */
+		memcpy(sdata->link, old_data, sizeof(old_data));
+		memcpy(sdata->vif.link_conf, old, sizeof(old));
+		sdata->vif.valid_links = old_links;
+		/* and free (only) the newly allocated links */
+		memset(to_free, 0, sizeof(links));
+		goto free;
+	}
+
+	/* use deflink/bss_conf again if and only if there are no more links */
+	use_deflink = new_links == 0;
+
+	goto deinit;
+free:
+	/* if we failed during allocation, only free all */
+	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
+		kfree(links[link_id]);
+		links[link_id] = NULL;
+	}
+deinit:
+	if (use_deflink)
+		ieee80211_link_init(sdata, -1, &sdata->deflink,
+				    &sdata->vif.bss_conf);
+	return ret;
+}
+
+int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
+			    u16 new_links)
+{
+	struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
+	int ret;
+
+	ret = ieee80211_vif_update_links(sdata, links, new_links);
+	ieee80211_free_links(sdata, links);
+
+	return ret;
+}
+
+static void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
+{
+	struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
+
+	/*
+	 * The locking here is different because when we free links
+	 * in the station case we need to be able to cancel_work_sync()
+	 * something that also takes the lock.
+	 */
+
+	sdata_lock(sdata);
+	ieee80211_vif_update_links(sdata, links, 0);
+	sdata_unlock(sdata);
+
+	ieee80211_free_links(sdata, links);
+}
+
 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 {
 	struct ieee80211_local *local = sdata->local;
@@ -380,9 +620,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
 	bool cancel_scan;
 	struct cfg80211_nan_func *func;
 
-	spin_lock_bh(&local->fq.lock);
 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
-	spin_unlock_bh(&local->fq.lock);
+	synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 
 	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 	if (cancel_scan)
@@ -480,7 +719,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
 		chandef = sdata->vif.bss_conf.chandef;
 		WARN_ON(local->suspended);
 		mutex_lock(&local->mtx);
-		ieee80211_link_release_channel(sdata->link[0]);
+		ieee80211_link_release_channel(&sdata->deflink);
 		mutex_unlock(&local->mtx);
 		cfg80211_cac_event(sdata->dev, &chandef,
 				   NL80211_RADAR_CAC_ABORTED,
@@ -729,6 +968,9 @@ static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 
 	if (ieee80211_vif_is_mesh(&sdata->vif))
 		ieee80211_mesh_teardown_sdata(sdata);
+
+	ieee80211_vif_clear_links(sdata);
+	ieee80211_link_stop(&sdata->deflink);
 }
 
 static void ieee80211_uninit(struct net_device *dev)
@@ -1021,49 +1263,6 @@ static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 }
 
-static void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
-				int link_id,
-				struct ieee80211_link_data *link,
-				struct ieee80211_bss_conf *link_conf)
-{
-	bool deflink = link_id < 0;
-
-	if (link_id < 0)
-		link_id = 0;
-
-	sdata->vif.link_conf[link_id] = link_conf;
-	sdata->link[link_id] = link;
-
-	link->sdata = sdata;
-	link->link_id = link_id;
-
-	INIT_WORK(&link->csa_finalize_work,
-		  ieee80211_csa_finalize_work);
-	INIT_WORK(&link->color_change_finalize_work,
-		  ieee80211_color_change_finalize_work);
-	INIT_LIST_HEAD(&link->assigned_chanctx_list);
-	INIT_LIST_HEAD(&link->reserved_chanctx_list);
-	INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
-			  ieee80211_dfs_cac_timer_work);
-
-	if (!deflink) {
-		switch (sdata->vif.type) {
-		case NL80211_IFTYPE_AP:
-			ether_addr_copy(link_conf->addr,
-					sdata->wdev.links[link_id].addr);
-			WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
-			break;
-		case NL80211_IFTYPE_STATION:
-			eth_random_addr(link_conf->addr);
-			ether_addr_copy(sdata->wdev.links[link_id].addr,
-					link_conf->addr);
-			break;
-		default:
-			WARN_ON(1);
-		}
-	}
-}
-
 static void ieee80211_sdata_init(struct ieee80211_local *local,
 				 struct ieee80211_sub_if_data *sdata)
 {
@@ -1128,7 +1327,7 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 	mutex_unlock(&local->iflist_mtx);
 
 	mutex_lock(&local->mtx);
-	ret = ieee80211_link_use_channel(sdata->link[0], &local->monitor_chandef,
+	ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
 					 IEEE80211_CHANCTX_EXCLUSIVE);
 	mutex_unlock(&local->mtx);
 	if (ret) {
@@ -1173,7 +1372,7 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 	synchronize_net();
 
 	mutex_lock(&local->mtx);
-	ieee80211_link_release_channel(sdata->link[0]);
+	ieee80211_link_release_channel(&sdata->deflink);
 	mutex_unlock(&local->mtx);
 
 	drv_remove_interface(local, sdata);
@@ -1279,7 +1478,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 	case NL80211_IFTYPE_AP_VLAN:
 		/* no need to tell driver, but set carrier and chanctx */
 		if (sdata->bss->active) {
-			ieee80211_link_vlan_copy_chanctx(sdata->link[0]);
+			ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
 			netif_carrier_on(dev);
 			ieee80211_set_vif_encap_ops(sdata);
 		} else {
@@ -1351,7 +1550,8 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 		    sdata->vif.type != NL80211_IFTYPE_NAN)
 			changed |= ieee80211_reset_erp_info(sdata);
-		ieee80211_link_info_change_notify(sdata, 0, changed);
+		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
+						  changed);
 
 		switch (sdata->vif.type) {
 		case NL80211_IFTYPE_STATION:
@@ -1375,7 +1575,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 		 * doesn't start up with sane defaults.
 		 * Enable QoS for anything but station interfaces.
 		 */
-		ieee80211_set_wmm_default(sdata, true,
+		ieee80211_set_wmm_default(&sdata->deflink, true,
 			sdata->vif.type != NL80211_IFTYPE_STATION);
 	}
 
@@ -1535,7 +1735,8 @@ static void ieee80211_iface_process_skb(struct ieee80211_local *local,
 			break;
 		}
 		case WLAN_VHT_ACTION_GROUPID_MGMT:
-			ieee80211_process_mu_groups(sdata, 0, mgmt);
+			ieee80211_process_mu_groups(sdata, &sdata->deflink,
+						    mgmt);
 			break;
 		default:
 			WARN_ON(1);
@@ -1689,7 +1890,7 @@ static void ieee80211_recalc_smps_work(struct work_struct *work)
 	struct ieee80211_sub_if_data *sdata =
 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
 
-	ieee80211_recalc_smps(sdata, 0);
+	ieee80211_recalc_smps(sdata, &sdata->deflink);
 }
 
 /*
@@ -1784,6 +1985,9 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 		break;
 	}
 
+	/* need to do this after the switch so vif.type is correct */
+	ieee80211_link_setup(&sdata->deflink);
+
 	ieee80211_debugfs_add_netdev(sdata);
 }
 
@@ -2352,96 +2556,3 @@ void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
 }
-
-int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
-			    u16 new_links)
-{
-	u16 old_links = sdata->vif.valid_links;
-	unsigned long add = new_links & ~old_links;
-	unsigned long rem = old_links & ~new_links;
-	unsigned int link_id;
-	int ret;
-	struct {
-		struct ieee80211_link_data data;
-		struct ieee80211_bss_conf conf;
-	} *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
-	struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
-	struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
-	bool use_deflink = old_links == 0; /* set for error case */
-
-	sdata_assert_lock(sdata);
-
-	if (old_links == new_links)
-		return 0;
-
-	/* allocate new link structures first */
-	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
-		link = kzalloc(sizeof(*link), GFP_KERNEL);
-		if (!link) {
-			ret = -ENOMEM;
-			goto free;
-		}
-		links[link_id] = link;
-	}
-
-	/* keep track of the old pointers for the driver */
-	BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
-	memcpy(old, sdata->vif.link_conf, sizeof(old));
-	/* and for us in error cases */
-	BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
-	memcpy(old_data, sdata->link, sizeof(old_data));
-
-	/* link them into data structures */
-	for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
-		WARN_ON(!use_deflink &&
-			sdata->link[link_id] == &sdata->deflink);
-
-		link = links[link_id];
-		ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
-	}
-
-	for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
-		sdata->link[link_id] = NULL;
-		sdata->vif.link_conf[link_id] = NULL;
-	}
-
-	sdata->vif.valid_links = new_links;
-
-	/* tell the driver */
-	ret = drv_change_vif_links(sdata->local, sdata,
-				   old_links, new_links,
-				   old);
-	if (ret) {
-		/* restore config */
-		memcpy(sdata->link, old_data, sizeof(old_data));
-		memcpy(sdata->vif.link_conf, old, sizeof(old));
-		sdata->vif.valid_links = old_links;
-		/* and free the newly allocated links */
-		goto free;
-	}
-
-	/* use deflink/bss_conf again if and only if there are no more links */
-	use_deflink = new_links == 0;
-
-	/* now use this to free the old links */
-	memset(links, 0, sizeof(links));
-	for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
-		if (sdata->link[link_id] == &sdata->deflink)
-			continue;
-		/*
-		 * we must have allocated the data through this path so
-		 * we know we can free both at the same time
-		 */
-		links[link_id] = container_of(sdata->link[link_id],
-					      typeof(*links[link_id]),
-					      data);
-	}
-
-free:
-	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
-		kfree(links[link_id]);
-	if (use_deflink)
-		ieee80211_link_init(sdata, -1, &sdata->deflink,
-				    &sdata->vif.bss_conf);
-	return ret;
-}