mac80211: close AP_VLAN interfaces before unregistering all
[linux-3.10.git] / net / mac80211 / iface.c
index 2c059e5..514e90f 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Interface handling (except master interface)
+ * Interface handling
  *
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
@@ -78,7 +78,7 @@ void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
 }
 
-static u32 ieee80211_idle_off(struct ieee80211_local *local)
+static u32 __ieee80211_idle_off(struct ieee80211_local *local)
 {
        if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
                return 0;
@@ -87,27 +87,29 @@ static u32 ieee80211_idle_off(struct ieee80211_local *local)
        return IEEE80211_CONF_CHANGE_IDLE;
 }
 
-static u32 ieee80211_idle_on(struct ieee80211_local *local)
+static u32 __ieee80211_idle_on(struct ieee80211_local *local)
 {
        if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
                return 0;
 
-       drv_flush(local, false);
+       ieee80211_flush_queues(local, NULL);
 
        local->hw.conf.flags |= IEEE80211_CONF_IDLE;
        return IEEE80211_CONF_CHANGE_IDLE;
 }
 
-void ieee80211_recalc_idle(struct ieee80211_local *local)
+static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
+                                  bool force_active)
 {
        bool working = false, scanning, active;
        unsigned int led_trig_start = 0, led_trig_stop = 0;
        struct ieee80211_roc_work *roc;
-       u32 change;
 
        lockdep_assert_held(&local->mtx);
 
-       active = !list_empty(&local->chanctx_list);
+       active = force_active ||
+                !list_empty(&local->chanctx_list) ||
+                local->monitors;
 
        if (!local->ops->remain_on_channel) {
                list_for_each_entry(roc, &local->roc_list, list) {
@@ -132,9 +134,18 @@ void ieee80211_recalc_idle(struct ieee80211_local *local)
        ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 
        if (working || scanning || active)
-               change = ieee80211_idle_off(local);
-       else
-               change = ieee80211_idle_on(local);
+               return __ieee80211_idle_off(local);
+       return __ieee80211_idle_on(local);
+}
+
+u32 ieee80211_idle_off(struct ieee80211_local *local)
+{
+       return __ieee80211_recalc_idle(local, true);
+}
+
+void ieee80211_recalc_idle(struct ieee80211_local *local)
+{
+       u32 change = __ieee80211_recalc_idle(local, false);
        if (change)
                ieee80211_hw_config(local, change);
 }
@@ -148,9 +159,10 @@ static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
        return 0;
 }
 
-static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
+static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr)
 {
-       struct ieee80211_sub_if_data *sdata;
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_sub_if_data *iter;
        u64 new, mask, tmp;
        u8 *m;
        int ret = 0;
@@ -170,11 +182,14 @@ static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 
 
        mutex_lock(&local->iflist_mtx);
-       list_for_each_entry(sdata, &local->interfaces, list) {
-               if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
+       list_for_each_entry(iter, &local->interfaces, list) {
+               if (iter == sdata)
                        continue;
 
-               m = sdata->vif.addr;
+               if (iter->vif.type == NL80211_IFTYPE_MONITOR)
+                       continue;
+
+               m = iter->vif.addr;
                tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
@@ -198,7 +213,7 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
        if (ieee80211_sdata_running(sdata))
                return -EBUSY;
 
-       ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
+       ret = ieee80211_verify_mac(sdata, sa->sa_data);
        if (ret)
                return ret;
 
@@ -346,24 +361,22 @@ static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
        sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 }
 
-static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
+int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 {
        struct ieee80211_sub_if_data *sdata;
-       int ret = 0;
+       int ret;
 
        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
                return 0;
 
-       mutex_lock(&local->iflist_mtx);
+       ASSERT_RTNL();
 
        if (local->monitor_sdata)
-               goto out_unlock;
+               return 0;
 
        sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
-       if (!sdata) {
-               ret = -ENOMEM;
-               goto out_unlock;
-       }
+       if (!sdata)
+               return -ENOMEM;
 
        /* set up data */
        sdata->local = local;
@@ -377,13 +390,13 @@ static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
        if (WARN_ON(ret)) {
                /* ok .. stupid driver, it asked for this! */
                kfree(sdata);
-               goto out_unlock;
+               return ret;
        }
 
        ret = ieee80211_check_queues(sdata);
        if (ret) {
                kfree(sdata);
-               goto out_unlock;
+               return ret;
        }
 
        ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
@@ -391,30 +404,37 @@ static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
        if (ret) {
                drv_remove_interface(local, sdata);
                kfree(sdata);
-               goto out_unlock;
+               return ret;
        }
 
+       mutex_lock(&local->iflist_mtx);
        rcu_assign_pointer(local->monitor_sdata, sdata);
- out_unlock:
        mutex_unlock(&local->iflist_mtx);
-       return ret;
+
+       return 0;
 }
 
-static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
+void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 {
        struct ieee80211_sub_if_data *sdata;
 
        if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
                return;
 
+       ASSERT_RTNL();
+
        mutex_lock(&local->iflist_mtx);
 
        sdata = rcu_dereference_protected(local->monitor_sdata,
                                          lockdep_is_held(&local->iflist_mtx));
-       if (!sdata)
-               goto out_unlock;
+       if (!sdata) {
+               mutex_unlock(&local->iflist_mtx);
+               return;
+       }
 
        rcu_assign_pointer(local->monitor_sdata, NULL);
+       mutex_unlock(&local->iflist_mtx);
+
        synchronize_net();
 
        ieee80211_vif_release_channel(sdata);
@@ -422,8 +442,6 @@ static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
        drv_remove_interface(local, sdata);
 
        kfree(sdata);
- out_unlock:
-       mutex_unlock(&local->iflist_mtx);
 }
 
 /*
@@ -460,6 +478,9 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
                        master->control_port_protocol;
                sdata->control_port_no_encrypt =
                        master->control_port_no_encrypt;
+               sdata->vif.cab_queue = master->vif.cab_queue;
+               memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
+                      sizeof(sdata->vif.hw_queue));
                break;
                }
        case NL80211_IFTYPE_AP:
@@ -485,8 +506,6 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
                res = drv_start(local);
                if (res)
                        goto err_del_bss;
-               if (local->ops->napi_poll)
-                       napi_enable(&local->napi);
                /* we're brought up, everything changes */
                hw_reconf_flags = ~0;
                ieee80211_led_radio(local, true);
@@ -541,6 +560,9 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 
                ieee80211_adjust_monitor_flags(sdata, 1);
                ieee80211_configure_filter(local);
+               mutex_lock(&local->mtx);
+               ieee80211_recalc_idle(local);
+               mutex_unlock(&local->mtx);
 
                netif_carrier_on(dev);
                break;
@@ -556,8 +578,6 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
                                goto err_del_interface;
                }
 
-               drv_add_interface_debugfs(local, sdata);
-
                if (sdata->vif.type == NL80211_IFTYPE_AP) {
                        local->fif_pspoll++;
                        local->fif_probe_req++;
@@ -582,7 +602,8 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
                case NL80211_IFTYPE_P2P_DEVICE:
                        break;
                default:
-                       netif_carrier_on(dev);
+                       /* not reached */
+                       WARN_ON(1);
                }
 
                /*
@@ -639,8 +660,32 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 
        ieee80211_recalc_ps(local, -1);
 
-       if (dev)
+       if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
+           sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+               /* XXX: for AP_VLAN, actually track AP queues */
                netif_tx_start_all_queues(dev);
+       } else if (dev) {
+               unsigned long flags;
+               int n_acs = IEEE80211_NUM_ACS;
+               int ac;
+
+               if (local->hw.queues < IEEE80211_NUM_ACS)
+                       n_acs = 1;
+
+               spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
+               if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
+                   (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
+                    skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
+                       for (ac = 0; ac < n_acs; ac++) {
+                               int ac_queue = sdata->vif.hw_queue[ac];
+
+                               if (local->queue_stop_reasons[ac_queue] == 0 &&
+                                   skb_queue_empty(&local->pending[ac_queue]))
+                                       netif_start_subqueue(dev, ac);
+                       }
+               }
+               spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+       }
 
        return 0;
  err_del_interface:
@@ -694,7 +739,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
        if (sdata->dev)
                netif_tx_stop_all_queues(sdata->dev);
 
-       ieee80211_roc_purge(sdata);
+       ieee80211_roc_purge(local, sdata);
 
        if (sdata->vif.type == NL80211_IFTYPE_STATION)
                ieee80211_mgd_stop(sdata);
@@ -719,12 +764,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
        WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
                     (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 
-       /*
-        * Don't count this interface for promisc/allmulti while it
-        * is down. dev_mc_unsync() will invoke set_multicast_list
-        * on the master interface which will sync these down to the
-        * hardware as filter flags.
-        */
+       /* don't count this interface for promisc/allmulti while it is down */
        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
                atomic_dec(&local->iff_allmultis);
 
@@ -745,8 +785,6 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
                                 sdata->dev->addr_len);
                spin_unlock_bh(&local->filter_lock);
                netif_addr_unlock_bh(sdata->dev);
-
-               ieee80211_configure_filter(local);
        }
 
        del_timer_sync(&local->dynamic_ps_timer);
@@ -757,6 +795,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
        cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 
        if (sdata->wdev.cac_started) {
+               WARN_ON(local->suspended);
                mutex_lock(&local->iflist_mtx);
                ieee80211_vif_release_channel(sdata);
                mutex_unlock(&local->iflist_mtx);
@@ -807,11 +846,9 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
                if (local->monitors == 0) {
                        local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
                        hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
-                       ieee80211_del_virtual_monitor(local);
                }
 
                ieee80211_adjust_monitor_flags(sdata, -1);
-               ieee80211_configure_filter(local);
                break;
        case NL80211_IFTYPE_P2P_DEVICE:
                /* relies on synchronize_rcu() below */
@@ -824,46 +861,28 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
                 *
                 * sta_info_flush_cleanup() requires rcu_barrier()
                 * first to wait for the station call_rcu() calls
-                * to complete, here we need at least sychronize_rcu()
-                * it to wait for the RX path in case it is using the
+                * to complete, and we also need synchronize_rcu()
+                * to wait for the RX path in case it is using the
                 * interface and enqueuing frames at this very time on
                 * another CPU.
                 */
+               synchronize_rcu();
                rcu_barrier();
                sta_info_flush_cleanup(sdata);
 
-               skb_queue_purge(&sdata->skb_queue);
-
                /*
                 * Free all remaining keys, there shouldn't be any,
-                * except maybe group keys in AP more or WDS?
+                * except maybe in WDS mode?
                 */
                ieee80211_free_keys(sdata);
 
-               drv_remove_interface_debugfs(local, sdata);
-
-               if (going_down)
-                       drv_remove_interface(local, sdata);
+               /* fall through */
+       case NL80211_IFTYPE_AP:
+               skb_queue_purge(&sdata->skb_queue);
        }
 
        sdata->bss = NULL;
 
-       ieee80211_recalc_ps(local, -1);
-
-       if (local->open_count == 0) {
-               if (local->ops->napi_poll)
-                       napi_disable(&local->napi);
-               ieee80211_clear_tx_pending(local);
-               ieee80211_stop_device(local);
-
-               /* no reconfiguring after stop! */
-               hw_reconf_flags = 0;
-       }
-
-       /* do after stop to avoid reconfiguring when we stop anyway */
-       if (hw_reconf_flags)
-               ieee80211_hw_config(local, hw_reconf_flags);
-
        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
        for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
                skb_queue_walk_safe(&local->pending[i], skb, tmp) {
@@ -876,7 +895,54 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
        }
        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 
-       if (local->monitors == local->open_count && local->monitors > 0)
+       if (local->open_count == 0)
+               ieee80211_clear_tx_pending(local);
+
+       /*
+        * If the interface goes down while suspended, presumably because
+        * the device was unplugged and that happens before our resume,
+        * then the driver is already unconfigured and the remainder of
+        * this function isn't needed.
+        * XXX: what about WoWLAN? If the device has software state, e.g.
+        *      memory allocated, it might expect teardown commands from
+        *      mac80211 here?
+        */
+       if (local->suspended) {
+               WARN_ON(local->wowlan);
+               WARN_ON(rtnl_dereference(local->monitor_sdata));
+               return;
+       }
+
+       switch (sdata->vif.type) {
+       case NL80211_IFTYPE_AP_VLAN:
+               break;
+       case NL80211_IFTYPE_MONITOR:
+               if (local->monitors == 0)
+                       ieee80211_del_virtual_monitor(local);
+
+               mutex_lock(&local->mtx);
+               ieee80211_recalc_idle(local);
+               mutex_unlock(&local->mtx);
+               break;
+       default:
+               if (going_down)
+                       drv_remove_interface(local, sdata);
+       }
+
+       ieee80211_recalc_ps(local, -1);
+
+       if (local->open_count == 0) {
+               ieee80211_stop_device(local);
+
+               /* no reconfiguring after stop! */
+               return;
+       }
+
+       /* do after stop to avoid reconfiguring when we stop anyway */
+       ieee80211_configure_filter(local);
+       ieee80211_hw_config(local, hw_reconf_flags);
+
+       if (local->monitors == local->open_count)
                ieee80211_add_virtual_monitor(local);
 }
 
@@ -915,6 +981,17 @@ static void ieee80211_set_multicast_list(struct net_device *dev)
                        atomic_dec(&local->iff_promiscs);
                sdata->flags ^= IEEE80211_SDATA_PROMISC;
        }
+
+       /*
+        * TODO: If somebody needs this on AP interfaces,
+        *       it can be enabled easily but multicast
+        *       addresses from VLANs need to be synced.
+        */
+       if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
+           sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+           sdata->vif.type != NL80211_IFTYPE_AP)
+               drv_set_multicast_list(local, sdata, &dev->mc);
+
        spin_lock_bh(&local->filter_lock);
        __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
        spin_unlock_bh(&local->filter_lock);
@@ -1413,7 +1490,17 @@ static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
                        break;
                }
 
+               /*
+                * Pick address of existing interface in case user changed
+                * MAC address manually, default to perm_addr.
+                */
                m = local->hw.wiphy->perm_addr;
+               list_for_each_entry(sdata, &local->interfaces, list) {
+                       if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
+                               continue;
+                       m = sdata->vif.addr;
+                       break;
+               }
                start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
                        ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
                        ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
@@ -1541,6 +1628,8 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
        INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
        INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
                          ieee80211_dfs_cac_timer_work);
+       INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
+                         ieee80211_delayed_tailroom_dec);
 
        for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
                struct ieee80211_supported_band *sband;
@@ -1628,6 +1717,24 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local)
 
        ASSERT_RTNL();
 
+       /*
+        * Close all AP_VLAN interfaces first, as otherwise they
+        * might be closed while the AP interface they belong to
+        * is closed, causing unregister_netdevice_many() to crash.
+        */
+       list_for_each_entry(sdata, &local->interfaces, list)
+               if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+                       dev_close(sdata->dev);
+
+       /*
+        * Close all AP_VLAN interfaces first, as otherwise they
+        * might be closed while the AP interface they belong to
+        * is closed, causing unregister_netdevice_many() to crash.
+        */
+       list_for_each_entry(sdata, &local->interfaces, list)
+               if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+                       dev_close(sdata->dev);
+
        mutex_lock(&local->iflist_mtx);
        list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
                list_del(&sdata->list);