mac80211: move regular interface handling

Move the code to handle regular interfaces out of main.c and
into iface.c, keep only the master interface stuff in main.c.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 550 insertions, 551 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 80d88f5ff90c..6bd6a6306da3 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -891,6 +891,7 @@ u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
                         struct ieee80211_ht_bss_info *req_bss_cap);
 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
                                       u32 changed);
+void ieee80211_configure_filter(struct ieee80211_local *local);
 
 /* wireless extensions */
 extern const struct iw_handler_def ieee80211_iw_handler_def;
@@ -952,7 +953,6 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local,
                           struct ieee80211_bss *bss);
 
 /* interface handling */
-void ieee80211_if_setup(struct net_device *dev);
 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
                      struct net_device **new_dev, enum nl80211_iftype type,
                      struct vif_params *params);
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 004fb23241da..f528962b13e3 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1,4 +1,6 @@
 /*
+ * Interface handling (except master interface)
+ *
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
@@ -17,7 +19,539 @@
 #include "sta_info.h"
 #include "debugfs_netdev.h"
 #include "mesh.h"
+#include "led.h"
+
+static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
+{
+        int meshhdrlen;
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
+
+        /* FIX: what would be proper limits for MTU?
+         * This interface uses 802.3 frames. */
+        if (new_mtu < 256 ||
+            new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
+                return -EINVAL;
+        }
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+        printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+        dev->mtu = new_mtu;
+        return 0;
+}
+
+static inline int identical_mac_addr_allowed(int type1, int type2)
+{
+        return type1 == NL80211_IFTYPE_MONITOR ||
+                type2 == NL80211_IFTYPE_MONITOR ||
+                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
+                (type1 == NL80211_IFTYPE_WDS &&
+                        (type2 == NL80211_IFTYPE_WDS ||
+                         type2 == NL80211_IFTYPE_AP)) ||
+                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
+                (type1 == NL80211_IFTYPE_AP_VLAN &&
+                        (type2 == NL80211_IFTYPE_AP ||
+                         type2 == NL80211_IFTYPE_AP_VLAN));
+}
+
+static int ieee80211_open(struct net_device *dev)
+{
+        struct ieee80211_sub_if_data *sdata, *nsdata;
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct sta_info *sta;
+        struct ieee80211_if_init_conf conf;
+        u32 changed = 0;
+        int res;
+        bool need_hw_reconfig = 0;
+        u8 null_addr[ETH_ALEN] = {0};
+
+        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        /* fail early if user set an invalid address */
+        if (compare_ether_addr(dev->dev_addr, null_addr) &&
+            !is_valid_ether_addr(dev->dev_addr))
+                return -EADDRNOTAVAIL;
+
+        /* we hold the RTNL here so can safely walk the list */
+        list_for_each_entry(nsdata, &local->interfaces, list) {
+                struct net_device *ndev = nsdata->dev;
+
+                if (ndev != dev && netif_running(ndev)) {
+                        /*
+                         * Allow only a single IBSS interface to be up at any
+                         * time. This is restricted because beacon distribution
+                         * cannot work properly if both are in the same IBSS.
+                         *
+                         * To remove this restriction we'd have to disallow them
+                         * from setting the same SSID on different IBSS interfaces
+                         * belonging to the same hardware. Then, however, we're
+                         * faced with having to adopt two different TSF timers...
+                         */
+                        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
+                            nsdata->vif.type == NL80211_IFTYPE_ADHOC)
+                                return -EBUSY;
+
+                        /*
+                         * The remaining checks are only performed for interfaces
+                         * with the same MAC address.
+                         */
+                        if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
+                                continue;
+
+                        /*
+                         * check whether it may have the same address
+                         */
+                        if (!identical_mac_addr_allowed(sdata->vif.type,
+                                                        nsdata->vif.type))
+                                return -ENOTUNIQ;
+
+                        /*
+                         * can only add VLANs to enabled APs
+                         */
+                        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+                            nsdata->vif.type == NL80211_IFTYPE_AP)
+                                sdata->bss = &nsdata->u.ap;
+                }
+        }
+
+        switch (sdata->vif.type) {
+        case NL80211_IFTYPE_WDS:
+                if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
+                        return -ENOLINK;
+                break;
+        case NL80211_IFTYPE_AP_VLAN:
+                if (!sdata->bss)
+                        return -ENOLINK;
+                list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
+                break;
+        case NL80211_IFTYPE_AP:
+                sdata->bss = &sdata->u.ap;
+                break;
+        case NL80211_IFTYPE_MESH_POINT:
+                if (!ieee80211_vif_is_mesh(&sdata->vif))
+                        break;
+                /* mesh ifaces must set allmulti to forward mcast traffic */
+                atomic_inc(&local->iff_allmultis);
+                break;
+        case NL80211_IFTYPE_STATION:
+        case NL80211_IFTYPE_MONITOR:
+        case NL80211_IFTYPE_ADHOC:
+                /* no special treatment */
+                break;
+        case NL80211_IFTYPE_UNSPECIFIED:
+        case __NL80211_IFTYPE_AFTER_LAST:
+                /* cannot happen */
+                WARN_ON(1);
+                break;
+        }
+
+        if (local->open_count == 0) {
+                res = 0;
+                if (local->ops->start)
+                        res = local->ops->start(local_to_hw(local));
+                if (res)
+                        goto err_del_bss;
+                need_hw_reconfig = 1;
+                ieee80211_led_radio(local, local->hw.conf.radio_enabled);
+        }
 
+        /*
+         * Check all interfaces and copy the hopefully now-present
+         * MAC address to those that have the special null one.
+         */
+        list_for_each_entry(nsdata, &local->interfaces, list) {
+                struct net_device *ndev = nsdata->dev;
+
+                /*
+                 * No need to check netif_running since we do not allow
+                 * it to start up with this invalid address.
+                 */
+                if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
+                        memcpy(ndev->dev_addr,
+                               local->hw.wiphy->perm_addr,
+                               ETH_ALEN);
+        }
+
+        if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
+                memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
+                       ETH_ALEN);
+
+        /*
+         * Validate the MAC address for this device.
+         */
+        if (!is_valid_ether_addr(dev->dev_addr)) {
+                if (!local->open_count && local->ops->stop)
+                        local->ops->stop(local_to_hw(local));
+                return -EADDRNOTAVAIL;
+        }
+
+        switch (sdata->vif.type) {
+        case NL80211_IFTYPE_AP_VLAN:
+                /* no need to tell driver */
+                break;
+        case NL80211_IFTYPE_MONITOR:
+                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
+                        local->cooked_mntrs++;
+                        break;
+                }
+
+                /* must be before the call to ieee80211_configure_filter */
+                local->monitors++;
+                if (local->monitors == 1)
+                        local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
+
+                if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
+                        local->fif_fcsfail++;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
+                        local->fif_plcpfail++;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
+                        local->fif_control++;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
+                        local->fif_other_bss++;
+
+                netif_addr_lock_bh(local->mdev);
+                ieee80211_configure_filter(local);
+                netif_addr_unlock_bh(local->mdev);
+                break;
+        case NL80211_IFTYPE_STATION:
+        case NL80211_IFTYPE_ADHOC:
+                sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
+                /* fall through */
+        default:
+                conf.vif = &sdata->vif;
+                conf.type = sdata->vif.type;
+                conf.mac_addr = dev->dev_addr;
+                res = local->ops->add_interface(local_to_hw(local), &conf);
+                if (res)
+                        goto err_stop;
+
+                if (ieee80211_vif_is_mesh(&sdata->vif))
+                        ieee80211_start_mesh(sdata);
+                changed |= ieee80211_reset_erp_info(sdata);
+                ieee80211_bss_info_change_notify(sdata, changed);
+                ieee80211_enable_keys(sdata);
+
+                if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+                    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
+                        netif_carrier_off(dev);
+                else
+                        netif_carrier_on(dev);
+        }
+
+        if (sdata->vif.type == NL80211_IFTYPE_WDS) {
+                /* Create STA entry for the WDS peer */
+                sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
+                                     GFP_KERNEL);
+                if (!sta) {
+                        res = -ENOMEM;
+                        goto err_del_interface;
+                }
+
+                /* no locking required since STA is not live yet */
+                sta->flags |= WLAN_STA_AUTHORIZED;
+
+                res = sta_info_insert(sta);
+                if (res) {
+                        /* STA has been freed */
+                        goto err_del_interface;
+                }
+        }
+
+        if (local->open_count == 0) {
+                res = dev_open(local->mdev);
+                WARN_ON(res);
+                if (res)
+                        goto err_del_interface;
+                tasklet_enable(&local->tx_pending_tasklet);
+                tasklet_enable(&local->tasklet);
+        }
+
+        /*
+         * set_multicast_list will be invoked by the networking core
+         * which will check whether any increments here were done in
+         * error and sync them down to the hardware as filter flags.
+         */
+        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
+                atomic_inc(&local->iff_allmultis);
+
+        if (sdata->flags & IEEE80211_SDATA_PROMISC)
+                atomic_inc(&local->iff_promiscs);
+
+        local->open_count++;
+        if (need_hw_reconfig) {
+                ieee80211_hw_config(local);
+                /*
+                 * set default queue parameters so drivers don't
+                 * need to initialise the hardware if the hardware
+                 * doesn't start up with sane defaults
+                 */
+                ieee80211_set_wmm_default(sdata);
+        }
+
+        /*
+         * ieee80211_sta_work is disabled while network interface
+         * is down. Therefore, some configuration changes may not
+         * yet be effective. Trigger execution of ieee80211_sta_work
+         * to fix this.
+         */
+        if (sdata->vif.type == NL80211_IFTYPE_STATION ||
+            sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+                queue_work(local->hw.workqueue, &ifsta->work);
+        }
+
+        netif_tx_start_all_queues(dev);
+
+        return 0;
+ err_del_interface:
+        local->ops->remove_interface(local_to_hw(local), &conf);
+ err_stop:
+        if (!local->open_count && local->ops->stop)
+                local->ops->stop(local_to_hw(local));
+ err_del_bss:
+        sdata->bss = NULL;
+        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+                list_del(&sdata->u.vlan.list);
+        return res;
+}
+
+static int ieee80211_stop(struct net_device *dev)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_if_init_conf conf;
+        struct sta_info *sta;
+
+        /*
+         * Stop TX on this interface first.
+         */
+        netif_tx_stop_all_queues(dev);
+
+        /*
+         * Now delete all active aggregation sessions.
+         */
+        rcu_read_lock();
+
+        list_for_each_entry_rcu(sta, &local->sta_list, list) {
+                if (sta->sdata == sdata)
+                        ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
+        }
+
+        rcu_read_unlock();
+
+        /*
+         * Remove all stations associated with this interface.
+         *
+         * This must be done before calling ops->remove_interface()
+         * because otherwise we can later invoke ops->sta_notify()
+         * whenever the STAs are removed, and that invalidates driver
+         * assumptions about always getting a vif pointer that is valid
+         * (because if we remove a STA after ops->remove_interface()
+         * the driver will have removed the vif info already!)
+         *
+         * We could relax this and only unlink the stations from the
+         * hash table and list but keep them on a per-sdata list that
+         * will be inserted back again when the interface is brought
+         * up again, but I don't currently see a use case for that,
+         * except with WDS which gets a STA entry created when it is
+         * brought up.
+         */
+        sta_info_flush(local, sdata);
+
+        /*
+         * 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.
+         */
+        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
+                atomic_dec(&local->iff_allmultis);
+
+        if (sdata->flags & IEEE80211_SDATA_PROMISC)
+                atomic_dec(&local->iff_promiscs);
+
+        dev_mc_unsync(local->mdev, dev);
+
+        /* APs need special treatment */
+        if (sdata->vif.type == NL80211_IFTYPE_AP) {
+                struct ieee80211_sub_if_data *vlan, *tmp;
+                struct beacon_data *old_beacon = sdata->u.ap.beacon;
+
+                /* remove beacon */
+                rcu_assign_pointer(sdata->u.ap.beacon, NULL);
+                synchronize_rcu();
+                kfree(old_beacon);
+
+                /* down all dependent devices, that is VLANs */
+                list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
+                                         u.vlan.list)
+                        dev_close(vlan->dev);
+                WARN_ON(!list_empty(&sdata->u.ap.vlans));
+        }
+
+        local->open_count--;
+
+        switch (sdata->vif.type) {
+        case NL80211_IFTYPE_AP_VLAN:
+                list_del(&sdata->u.vlan.list);
+                /* no need to tell driver */
+                break;
+        case NL80211_IFTYPE_MONITOR:
+                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
+                        local->cooked_mntrs--;
+                        break;
+                }
+
+                local->monitors--;
+                if (local->monitors == 0)
+                        local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
+
+                if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
+                        local->fif_fcsfail--;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
+                        local->fif_plcpfail--;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
+                        local->fif_control--;
+                if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
+                        local->fif_other_bss--;
+
+                netif_addr_lock_bh(local->mdev);
+                ieee80211_configure_filter(local);
+                netif_addr_unlock_bh(local->mdev);
+                break;
+        case NL80211_IFTYPE_STATION:
+        case NL80211_IFTYPE_ADHOC:
+                sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
+                memset(sdata->u.sta.bssid, 0, ETH_ALEN);
+                del_timer_sync(&sdata->u.sta.timer);
+                /*
+                 * If the timer fired while we waited for it, it will have
+                 * requeued the work. Now the work will be running again
+                 * but will not rearm the timer again because it checks
+                 * whether the interface is running, which, at this point,
+                 * it no longer is.
+                 */
+                cancel_work_sync(&sdata->u.sta.work);
+                /*
+                 * When we get here, the interface is marked down.
+                 * Call synchronize_rcu() to wait for the RX path
+                 * should it be using the interface and enqueuing
+                 * frames at this very time on another CPU.
+                 */
+                synchronize_rcu();
+                skb_queue_purge(&sdata->u.sta.skb_queue);
+
+                sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
+                kfree(sdata->u.sta.extra_ie);
+                sdata->u.sta.extra_ie = NULL;
+                sdata->u.sta.extra_ie_len = 0;
+                /* fall through */
+        case NL80211_IFTYPE_MESH_POINT:
+                if (ieee80211_vif_is_mesh(&sdata->vif)) {
+                        /* allmulti is always set on mesh ifaces */
+                        atomic_dec(&local->iff_allmultis);
+                        ieee80211_stop_mesh(sdata);
+                }
+                /* fall through */
+        default:
+                if (local->scan_sdata == sdata) {
+                        if (!local->ops->hw_scan)
+                                cancel_delayed_work_sync(&local->scan_work);
+                        /*
+                         * The software scan can no longer run now, so we can
+                         * clear out the scan_sdata reference. However, the
+                         * hardware scan may still be running. The complete
+                         * function must be prepared to handle a NULL value.
+                         */
+                        local->scan_sdata = NULL;
+                        /*
+                         * The memory barrier guarantees that another CPU
+                         * that is hardware-scanning will now see the fact
+                         * that this interface is gone.
+                         */
+                        smp_mb();
+                        /*
+                         * If software scanning, complete the scan but since
+                         * the scan_sdata is NULL already don't send out a
+                         * scan event to userspace -- the scan is incomplete.
+                         */
+                        if (local->sw_scanning)
+                                ieee80211_scan_completed(&local->hw);
+                }
+
+                conf.vif = &sdata->vif;
+                conf.type = sdata->vif.type;
+                conf.mac_addr = dev->dev_addr;
+                /* disable all keys for as long as this netdev is down */
+                ieee80211_disable_keys(sdata);
+                local->ops->remove_interface(local_to_hw(local), &conf);
+        }
+
+        sdata->bss = NULL;
+
+        if (local->open_count == 0) {
+                if (netif_running(local->mdev))
+                        dev_close(local->mdev);
+
+                if (local->ops->stop)
+                        local->ops->stop(local_to_hw(local));
+
+                ieee80211_led_radio(local, 0);
+
+                flush_workqueue(local->hw.workqueue);
+
+                tasklet_disable(&local->tx_pending_tasklet);
+                tasklet_disable(&local->tasklet);
+        }
+
+        return 0;
+}
+
+static void ieee80211_set_multicast_list(struct net_device *dev)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        int allmulti, promisc, sdata_allmulti, sdata_promisc;
+
+        allmulti = !!(dev->flags & IFF_ALLMULTI);
+        promisc = !!(dev->flags & IFF_PROMISC);
+        sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
+        sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
+
+        if (allmulti != sdata_allmulti) {
+                if (dev->flags & IFF_ALLMULTI)
+                        atomic_inc(&local->iff_allmultis);
+                else
+                        atomic_dec(&local->iff_allmultis);
+                sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
+        }
+
+        if (promisc != sdata_promisc) {
+                if (dev->flags & IFF_PROMISC)
+                        atomic_inc(&local->iff_promiscs);
+                else
+                        atomic_dec(&local->iff_promiscs);
+                sdata->flags ^= IEEE80211_SDATA_PROMISC;
+        }
+
+        dev_mc_sync(local->mdev, dev);
+}
+
+static void ieee80211_if_setup(struct net_device *dev)
+{
+        ether_setup(dev);
+        dev->hard_start_xmit = ieee80211_subif_start_xmit;
+        dev->wireless_handlers = &ieee80211_iw_handler_def;
+        dev->set_multicast_list = ieee80211_set_multicast_list;
+        dev->change_mtu = ieee80211_change_mtu;
+        dev->open = ieee80211_open;
+        dev->stop = ieee80211_stop;
+        dev->destructor = free_netdev;
+        /* we will validate the address ourselves in ->open */
+        dev->validate_addr = NULL;
+}
 /*
  * Called when the netdev is removed or, by the code below, before
  * the interface type changes.
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 584a75bd6cfe..c532043c1a1c 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -45,16 +45,9 @@ struct ieee80211_tx_status_rtap_hdr {
         u8 data_retries;
 } __attribute__ ((packed));
 
-/* common interface routines */
-
-static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
-{
-        memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
-        return ETH_ALEN;
-}
 
 /* must be called under mdev tx lock */
-static void ieee80211_configure_filter(struct ieee80211_local *local)
+void ieee80211_configure_filter(struct ieee80211_local *local)
 {
         unsigned int changed_flags;
         unsigned int new_flags = 0;
@@ -97,6 +90,20 @@ static void ieee80211_configure_filter(struct ieee80211_local *local)
 
 /* master interface */
 
+static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
+{
+        memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
+        return ETH_ALEN;
+}
+
+static const struct header_ops ieee80211_header_ops = {
+        .create         = eth_header,
+        .parse          = header_parse_80211,
+        .rebuild        = eth_rebuild_header,
+        .cache          = eth_header_cache,
+        .cache_update   = eth_header_cache_update,
+};
+
 static int ieee80211_master_open(struct net_device *dev)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
@@ -139,548 +146,6 @@ static void ieee80211_master_set_multicast_list(struct net_device *dev)
         ieee80211_configure_filter(local);
 }
 
-/* regular interfaces */
-
-static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
-{
-        int meshhdrlen;
-        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-
-        meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
-
-        /* FIX: what would be proper limits for MTU?
-         * This interface uses 802.3 frames. */
-        if (new_mtu < 256 ||
-            new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
-                return -EINVAL;
-        }
-
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-        printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
-#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
-        dev->mtu = new_mtu;
-        return 0;
-}
-
-static inline int identical_mac_addr_allowed(int type1, int type2)
-{
-        return type1 == NL80211_IFTYPE_MONITOR ||
-                type2 == NL80211_IFTYPE_MONITOR ||
-                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
-                (type1 == NL80211_IFTYPE_WDS &&
-                        (type2 == NL80211_IFTYPE_WDS ||
-                         type2 == NL80211_IFTYPE_AP)) ||
-                (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
-                (type1 == NL80211_IFTYPE_AP_VLAN &&
-                        (type2 == NL80211_IFTYPE_AP ||
-                         type2 == NL80211_IFTYPE_AP_VLAN));
-}
-
-static int ieee80211_open(struct net_device *dev)
-{
-        struct ieee80211_sub_if_data *sdata, *nsdata;
-        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-        struct sta_info *sta;
-        struct ieee80211_if_init_conf conf;
-        u32 changed = 0;
-        int res;
-        bool need_hw_reconfig = 0;
-        u8 null_addr[ETH_ALEN] = {0};
-
-        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-
-        /* fail early if user set an invalid address */
-        if (compare_ether_addr(dev->dev_addr, null_addr) &&
-            !is_valid_ether_addr(dev->dev_addr))
-                return -EADDRNOTAVAIL;
-
-        /* we hold the RTNL here so can safely walk the list */
-        list_for_each_entry(nsdata, &local->interfaces, list) {
-                struct net_device *ndev = nsdata->dev;
-
-                if (ndev != dev && netif_running(ndev)) {
-                        /*
-                         * Allow only a single IBSS interface to be up at any
-                         * time. This is restricted because beacon distribution
-                         * cannot work properly if both are in the same IBSS.
-                         *
-                         * To remove this restriction we'd have to disallow them
-                         * from setting the same SSID on different IBSS interfaces
-                         * belonging to the same hardware. Then, however, we're
-                         * faced with having to adopt two different TSF timers...
-                         */
-                        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
-                            nsdata->vif.type == NL80211_IFTYPE_ADHOC)
-                                return -EBUSY;
-
-                        /*
-                         * The remaining checks are only performed for interfaces
-                         * with the same MAC address.
-                         */
-                        if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
-                                continue;
-
-                        /*
-                         * check whether it may have the same address
-                         */
-                        if (!identical_mac_addr_allowed(sdata->vif.type,
-                                                        nsdata->vif.type))
-                                return -ENOTUNIQ;
-
-                        /*
-                         * can only add VLANs to enabled APs
-                         */
-                        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
-                            nsdata->vif.type == NL80211_IFTYPE_AP)
-                                sdata->bss = &nsdata->u.ap;
-                }
-        }
-
-        switch (sdata->vif.type) {
-        case NL80211_IFTYPE_WDS:
-                if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
-                        return -ENOLINK;
-                break;
-        case NL80211_IFTYPE_AP_VLAN:
-                if (!sdata->bss)
-                        return -ENOLINK;
-                list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
-                break;
-        case NL80211_IFTYPE_AP:
-                sdata->bss = &sdata->u.ap;
-                break;
-        case NL80211_IFTYPE_MESH_POINT:
-                if (!ieee80211_vif_is_mesh(&sdata->vif))
-                        break;
-                /* mesh ifaces must set allmulti to forward mcast traffic */
-                atomic_inc(&local->iff_allmultis);
-                break;
-        case NL80211_IFTYPE_STATION:
-        case NL80211_IFTYPE_MONITOR:
-        case NL80211_IFTYPE_ADHOC:
-                /* no special treatment */
-                break;
-        case NL80211_IFTYPE_UNSPECIFIED:
-        case __NL80211_IFTYPE_AFTER_LAST:
-                /* cannot happen */
-                WARN_ON(1);
-                break;
-        }
-
-        if (local->open_count == 0) {
-                res = 0;
-                if (local->ops->start)
-                        res = local->ops->start(local_to_hw(local));
-                if (res)
-                        goto err_del_bss;
-                need_hw_reconfig = 1;
-                ieee80211_led_radio(local, local->hw.conf.radio_enabled);
-        }
-
-        /*
-         * Check all interfaces and copy the hopefully now-present
-         * MAC address to those that have the special null one.
-         */
-        list_for_each_entry(nsdata, &local->interfaces, list) {
-                struct net_device *ndev = nsdata->dev;
-
-                /*
-                 * No need to check netif_running since we do not allow
-                 * it to start up with this invalid address.
-                 */
-                if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
-                        memcpy(ndev->dev_addr,
-                               local->hw.wiphy->perm_addr,
-                               ETH_ALEN);
-        }
-
-        if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
-                memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
-                       ETH_ALEN);
-
-        /*
-         * Validate the MAC address for this device.
-         */
-        if (!is_valid_ether_addr(dev->dev_addr)) {
-                if (!local->open_count && local->ops->stop)
-                        local->ops->stop(local_to_hw(local));
-                return -EADDRNOTAVAIL;
-        }
-
-        switch (sdata->vif.type) {
-        case NL80211_IFTYPE_AP_VLAN:
-                /* no need to tell driver */
-                break;
-        case NL80211_IFTYPE_MONITOR:
-                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
-                        local->cooked_mntrs++;
-                        break;
-                }
-
-                /* must be before the call to ieee80211_configure_filter */
-                local->monitors++;
-                if (local->monitors == 1)
-                        local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
-
-                if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
-                        local->fif_fcsfail++;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
-                        local->fif_plcpfail++;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
-                        local->fif_control++;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
-                        local->fif_other_bss++;
-
-                netif_addr_lock_bh(local->mdev);
-                ieee80211_configure_filter(local);
-                netif_addr_unlock_bh(local->mdev);
-                break;
-        case NL80211_IFTYPE_STATION:
-        case NL80211_IFTYPE_ADHOC:
-                sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
-                /* fall through */
-        default:
-                conf.vif = &sdata->vif;
-                conf.type = sdata->vif.type;
-                conf.mac_addr = dev->dev_addr;
-                res = local->ops->add_interface(local_to_hw(local), &conf);
-                if (res)
-                        goto err_stop;
-
-                if (ieee80211_vif_is_mesh(&sdata->vif))
-                        ieee80211_start_mesh(sdata);
-                changed |= ieee80211_reset_erp_info(sdata);
-                ieee80211_bss_info_change_notify(sdata, changed);
-                ieee80211_enable_keys(sdata);
-
-                if (sdata->vif.type == NL80211_IFTYPE_STATION &&
-                    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
-                        netif_carrier_off(dev);
-                else
-                        netif_carrier_on(dev);
-        }
-
-        if (sdata->vif.type == NL80211_IFTYPE_WDS) {
-                /* Create STA entry for the WDS peer */
-                sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
-                                     GFP_KERNEL);
-                if (!sta) {
-                        res = -ENOMEM;
-                        goto err_del_interface;
-                }
-
-                /* no locking required since STA is not live yet */
-                sta->flags |= WLAN_STA_AUTHORIZED;
-
-                res = sta_info_insert(sta);
-                if (res) {
-                        /* STA has been freed */
-                        goto err_del_interface;
-                }
-        }
-
-        if (local->open_count == 0) {
-                res = dev_open(local->mdev);
-                WARN_ON(res);
-                if (res)
-                        goto err_del_interface;
-                tasklet_enable(&local->tx_pending_tasklet);
-                tasklet_enable(&local->tasklet);
-        }
-
-        /*
-         * set_multicast_list will be invoked by the networking core
-         * which will check whether any increments here were done in
-         * error and sync them down to the hardware as filter flags.
-         */
-        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
-                atomic_inc(&local->iff_allmultis);
-
-        if (sdata->flags & IEEE80211_SDATA_PROMISC)
-                atomic_inc(&local->iff_promiscs);
-
-        local->open_count++;
-        if (need_hw_reconfig) {
-                ieee80211_hw_config(local);
-                /*
-                 * set default queue parameters so drivers don't
-                 * need to initialise the hardware if the hardware
-                 * doesn't start up with sane defaults
-                 */
-                ieee80211_set_wmm_default(sdata);
-        }
-
-        /*
-         * ieee80211_sta_work is disabled while network interface
-         * is down. Therefore, some configuration changes may not
-         * yet be effective. Trigger execution of ieee80211_sta_work
-         * to fix this.
-         */
-        if (sdata->vif.type == NL80211_IFTYPE_STATION ||
-            sdata->vif.type == NL80211_IFTYPE_ADHOC) {
-                struct ieee80211_if_sta *ifsta = &sdata->u.sta;
-                queue_work(local->hw.workqueue, &ifsta->work);
-        }
-
-        netif_tx_start_all_queues(dev);
-
-        return 0;
- err_del_interface:
-        local->ops->remove_interface(local_to_hw(local), &conf);
- err_stop:
-        if (!local->open_count && local->ops->stop)
-                local->ops->stop(local_to_hw(local));
- err_del_bss:
-        sdata->bss = NULL;
-        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
-                list_del(&sdata->u.vlan.list);
-        return res;
-}
-
-static int ieee80211_stop(struct net_device *dev)
-{
-        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-        struct ieee80211_local *local = sdata->local;
-        struct ieee80211_if_init_conf conf;
-        struct sta_info *sta;
-
-        /*
-         * Stop TX on this interface first.
-         */
-        netif_tx_stop_all_queues(dev);
-
-        /*
-         * Now delete all active aggregation sessions.
-         */
-        rcu_read_lock();
-
-        list_for_each_entry_rcu(sta, &local->sta_list, list) {
-                if (sta->sdata == sdata)
-                        ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
-        }
-
-        rcu_read_unlock();
-
-        /*
-         * Remove all stations associated with this interface.
-         *
-         * This must be done before calling ops->remove_interface()
-         * because otherwise we can later invoke ops->sta_notify()
-         * whenever the STAs are removed, and that invalidates driver
-         * assumptions about always getting a vif pointer that is valid
-         * (because if we remove a STA after ops->remove_interface()
-         * the driver will have removed the vif info already!)
-         *
-         * We could relax this and only unlink the stations from the
-         * hash table and list but keep them on a per-sdata list that
-         * will be inserted back again when the interface is brought
-         * up again, but I don't currently see a use case for that,
-         * except with WDS which gets a STA entry created when it is
-         * brought up.
-         */
-        sta_info_flush(local, sdata);
-
-        /*
-         * 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.
-         */
-        if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
-                atomic_dec(&local->iff_allmultis);
-
-        if (sdata->flags & IEEE80211_SDATA_PROMISC)
-                atomic_dec(&local->iff_promiscs);
-
-        dev_mc_unsync(local->mdev, dev);
-
-        /* APs need special treatment */
-        if (sdata->vif.type == NL80211_IFTYPE_AP) {
-                struct ieee80211_sub_if_data *vlan, *tmp;
-                struct beacon_data *old_beacon = sdata->u.ap.beacon;
-
-                /* remove beacon */
-                rcu_assign_pointer(sdata->u.ap.beacon, NULL);
-                synchronize_rcu();
-                kfree(old_beacon);
-
-                /* down all dependent devices, that is VLANs */
-                list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
-                                         u.vlan.list)
-                        dev_close(vlan->dev);
-                WARN_ON(!list_empty(&sdata->u.ap.vlans));
-        }
-
-        local->open_count--;
-
-        switch (sdata->vif.type) {
-        case NL80211_IFTYPE_AP_VLAN:
-                list_del(&sdata->u.vlan.list);
-                /* no need to tell driver */
-                break;
-        case NL80211_IFTYPE_MONITOR:
-                if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
-                        local->cooked_mntrs--;
-                        break;
-                }
-
-                local->monitors--;
-                if (local->monitors == 0)
-                        local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
-
-                if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
-                        local->fif_fcsfail--;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
-                        local->fif_plcpfail--;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
-                        local->fif_control--;
-                if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
-                        local->fif_other_bss--;
-
-                netif_addr_lock_bh(local->mdev);
-                ieee80211_configure_filter(local);
-                netif_addr_unlock_bh(local->mdev);
-                break;
-        case NL80211_IFTYPE_STATION:
-        case NL80211_IFTYPE_ADHOC:
-                sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
-                memset(sdata->u.sta.bssid, 0, ETH_ALEN);
-                del_timer_sync(&sdata->u.sta.timer);
-                /*
-                 * If the timer fired while we waited for it, it will have
-                 * requeued the work. Now the work will be running again
-                 * but will not rearm the timer again because it checks
-                 * whether the interface is running, which, at this point,
-                 * it no longer is.
-                 */
-                cancel_work_sync(&sdata->u.sta.work);
-                /*
-                 * When we get here, the interface is marked down.
-                 * Call synchronize_rcu() to wait for the RX path
-                 * should it be using the interface and enqueuing
-                 * frames at this very time on another CPU.
-                 */
-                synchronize_rcu();
-                skb_queue_purge(&sdata->u.sta.skb_queue);
-
-                sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
-                kfree(sdata->u.sta.extra_ie);
-                sdata->u.sta.extra_ie = NULL;
-                sdata->u.sta.extra_ie_len = 0;
-                /* fall through */
-        case NL80211_IFTYPE_MESH_POINT:
-                if (ieee80211_vif_is_mesh(&sdata->vif)) {
-                        /* allmulti is always set on mesh ifaces */
-                        atomic_dec(&local->iff_allmultis);
-                        ieee80211_stop_mesh(sdata);
-                }
-                /* fall through */
-        default:
-                if (local->scan_sdata == sdata) {
-                        if (!local->ops->hw_scan)
-                                cancel_delayed_work_sync(&local->scan_work);
-                        /*
-                         * The software scan can no longer run now, so we can
-                         * clear out the scan_sdata reference. However, the
-                         * hardware scan may still be running. The complete
-                         * function must be prepared to handle a NULL value.
-                         */
-                        local->scan_sdata = NULL;
-                        /*
-                         * The memory barrier guarantees that another CPU
-                         * that is hardware-scanning will now see the fact
-                         * that this interface is gone.
-                         */
-                        smp_mb();
-                        /*
-                         * If software scanning, complete the scan but since
-                         * the scan_sdata is NULL already don't send out a
-                         * scan event to userspace -- the scan is incomplete.
-                         */
-                        if (local->sw_scanning)
-                                ieee80211_scan_completed(&local->hw);
-                }
-
-                conf.vif = &sdata->vif;
-                conf.type = sdata->vif.type;
-                conf.mac_addr = dev->dev_addr;
-                /* disable all keys for as long as this netdev is down */
-                ieee80211_disable_keys(sdata);
-                local->ops->remove_interface(local_to_hw(local), &conf);
-        }
-
-        sdata->bss = NULL;
-
-        if (local->open_count == 0) {
-                if (netif_running(local->mdev))
-                        dev_close(local->mdev);
-
-                if (local->ops->stop)
-                        local->ops->stop(local_to_hw(local));
-
-                ieee80211_led_radio(local, 0);
-
-                flush_workqueue(local->hw.workqueue);
-
-                tasklet_disable(&local->tx_pending_tasklet);
-                tasklet_disable(&local->tasklet);
-        }
-
-        return 0;
-}
-
-static void ieee80211_set_multicast_list(struct net_device *dev)
-{
-        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-        int allmulti, promisc, sdata_allmulti, sdata_promisc;
-
-        allmulti = !!(dev->flags & IFF_ALLMULTI);
-        promisc = !!(dev->flags & IFF_PROMISC);
-        sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
-        sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
-
-        if (allmulti != sdata_allmulti) {
-                if (dev->flags & IFF_ALLMULTI)
-                        atomic_inc(&local->iff_allmultis);
-                else
-                        atomic_dec(&local->iff_allmultis);
-                sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
-        }
-
-        if (promisc != sdata_promisc) {
-                if (dev->flags & IFF_PROMISC)
-                        atomic_inc(&local->iff_promiscs);
-                else
-                        atomic_dec(&local->iff_promiscs);
-                sdata->flags ^= IEEE80211_SDATA_PROMISC;
-        }
-
-        dev_mc_sync(local->mdev, dev);
-}
-
-static const struct header_ops ieee80211_header_ops = {
-        .create         = eth_header,
-        .parse          = header_parse_80211,
-        .rebuild        = eth_rebuild_header,
-        .cache          = eth_header_cache,
-        .cache_update   = eth_header_cache_update,
-};
-
-void ieee80211_if_setup(struct net_device *dev)
-{
-        ether_setup(dev);
-        dev->hard_start_xmit = ieee80211_subif_start_xmit;
-        dev->wireless_handlers = &ieee80211_iw_handler_def;
-        dev->set_multicast_list = ieee80211_set_multicast_list;
-        dev->change_mtu = ieee80211_change_mtu;
-        dev->open = ieee80211_open;
-        dev->stop = ieee80211_stop;
-        dev->destructor = free_netdev;
-        /* we will validate the address ourselves in ->open */
-        dev->validate_addr = NULL;
-}
-
 /* everything else */
 
 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)