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-rw-r--r--net/mac80211/iface.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 004fb23241d..f528962b13e 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.
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-31 13:36:13 +0000