diff options
Diffstat (limited to 'net/mac80211/main.c')
| -rw-r--r-- | net/mac80211/main.c | 565 |
1 files changed, 15 insertions, 550 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 584a75bd6cf..c532043c1a1 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) |