/* * Interface handling (except master interface) * * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright (c) 2006 Jiri Benc * Copyright 2008, Johannes Berg * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "sta_info.h" #include "debugfs_netdev.h" #include "mesh.h" #include "led.h" #include "driver-ops.h" #include "wme.h" /** * DOC: Interface list locking * * The interface list in each struct ieee80211_local is protected * three-fold: * * (1) modifications may only be done under the RTNL * (2) modifications and readers are protected against each other by * the iflist_mtx. * (3) modifications are done in an RCU manner so atomic readers * can traverse the list in RCU-safe blocks. * * As a consequence, reads (traversals) of the list can be protected * by either the RTNL, the iflist_mtx or RCU. */ 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 int ieee80211_change_mac(struct net_device *dev, void *addr) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct sockaddr *sa = addr; int ret; if (ieee80211_sdata_running(sdata)) return -EBUSY; ret = eth_mac_addr(dev, sa); if (ret == 0) memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN); return ret; } 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 = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_sub_if_data *nsdata; struct ieee80211_local *local = sdata->local; struct sta_info *sta; u32 changed = 0; int res; u32 hw_reconf_flags = 0; u8 null_addr[ETH_ALEN] = {0}; /* 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 && ieee80211_sdata_running(nsdata)) { /* * 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 = drv_start(local); if (res) goto err_del_bss; /* we're brought up, everything changes */ hw_reconf_flags = ~0; ieee80211_led_radio(local, true); } /* * 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 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); memcpy(ndev->perm_addr, ndev->dev_addr, ETH_ALEN); } } /* * Validate the MAC address for this device. */ if (!is_valid_ether_addr(dev->dev_addr)) { if (!local->open_count) drv_stop(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_MONITOR; hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; } 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++; local->fif_pspoll++; } if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) local->fif_other_bss++; ieee80211_configure_filter(local); break; default: res = drv_add_interface(local, &sdata->vif); if (res) goto err_stop; if (ieee80211_vif_is_mesh(&sdata->vif)) { local->fif_other_bss++; ieee80211_configure_filter(local); ieee80211_start_mesh(sdata); } else if (sdata->vif.type == NL80211_IFTYPE_AP) { local->fif_pspoll++; ieee80211_configure_filter(local); } changed |= ieee80211_reset_erp_info(sdata); ieee80211_bss_info_change_notify(sdata, changed); if (sdata->vif.type == NL80211_IFTYPE_STATION) 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; } } /* * 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); hw_reconf_flags |= __ieee80211_recalc_idle(local); local->open_count++; if (hw_reconf_flags) { ieee80211_hw_config(local, hw_reconf_flags); /* * 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_recalc_ps(local, -1); netif_tx_start_all_queues(dev); return 0; err_del_interface: drv_remove_interface(local, &sdata->vif); err_stop: if (!local->open_count) drv_stop(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; unsigned long flags; struct sk_buff *skb, *tmp; u32 hw_reconf_flags = 0; int i; /* * Stop TX on this interface first. */ netif_tx_stop_all_queues(dev); /* * Purge work for this interface. */ ieee80211_work_purge(sdata); /* * 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); if (sdata->vif.type == NL80211_IFTYPE_AP) local->fif_pspoll--; netif_addr_lock_bh(dev); spin_lock_bh(&local->filter_lock); __hw_addr_unsync(&local->mc_list, &dev->mc, dev->addr_len); spin_unlock_bh(&local->filter_lock); netif_addr_unlock_bh(dev); ieee80211_configure_filter(local); del_timer_sync(&local->dynamic_ps_timer); cancel_work_sync(&local->dynamic_ps_enable_work); /* APs need special treatment */ if (sdata->vif.type == NL80211_IFTYPE_AP) { struct ieee80211_sub_if_data *vlan, *tmpsdata; 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, tmpsdata, &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_MONITOR; hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR; } 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_pspoll--; local->fif_control--; } if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) local->fif_other_bss--; ieee80211_configure_filter(local); break; case NL80211_IFTYPE_STATION: del_timer_sync(&sdata->u.mgd.chswitch_timer); del_timer_sync(&sdata->u.mgd.timer); del_timer_sync(&sdata->u.mgd.conn_mon_timer); del_timer_sync(&sdata->u.mgd.bcn_mon_timer); /* * If any of the timers fired while we waited for it, it will * have queued its 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.mgd.work); cancel_work_sync(&sdata->u.mgd.chswitch_work); cancel_work_sync(&sdata->u.mgd.monitor_work); cancel_work_sync(&sdata->u.mgd.beacon_connection_loss_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.mgd.skb_queue); /* fall through */ case NL80211_IFTYPE_ADHOC: if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { del_timer_sync(&sdata->u.ibss.timer); cancel_work_sync(&sdata->u.ibss.work); synchronize_rcu(); skb_queue_purge(&sdata->u.ibss.skb_queue); } /* fall through */ case NL80211_IFTYPE_MESH_POINT: if (ieee80211_vif_is_mesh(&sdata->vif)) { /* other_bss and allmulti are always set on mesh * ifaces */ local->fif_other_bss--; atomic_dec(&local->iff_allmultis); ieee80211_configure_filter(local); ieee80211_stop_mesh(sdata); } /* fall through */ default: if (local->scan_sdata == sdata) ieee80211_scan_cancel(local); /* * Disable beaconing for AP and mesh, IBSS can't * still be joined to a network at this point. */ if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_MESH_POINT) { ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED); } /* free all remaining keys, there shouldn't be any */ ieee80211_free_keys(sdata); drv_remove_interface(local, &sdata->vif); } sdata->bss = NULL; hw_reconf_flags |= __ieee80211_recalc_idle(local); ieee80211_recalc_ps(local, -1); if (local->open_count == 0) { 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) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); if (info->control.vif == &sdata->vif) { __skb_unlink(skb, &local->pending[i]); dev_kfree_skb_irq(skb); } } } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); return 0; } static void ieee80211_set_multicast_list(struct net_device *dev) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; 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; } spin_lock_bh(&local->filter_lock); __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len); spin_unlock_bh(&local->filter_lock); ieee80211_queue_work(&local->hw, &local->reconfig_filter); } /* * Called when the netdev is removed or, by the code below, before * the interface type changes. */ static void ieee80211_teardown_sdata(struct net_device *dev) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; struct beacon_data *beacon; struct sk_buff *skb; int flushed; int i; /* free extra data */ ieee80211_free_keys(sdata); ieee80211_debugfs_remove_netdev(sdata); for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) __skb_queue_purge(&sdata->fragments[i].skb_list); sdata->fragment_next = 0; switch (sdata->vif.type) { case NL80211_IFTYPE_AP: beacon = sdata->u.ap.beacon; rcu_assign_pointer(sdata->u.ap.beacon, NULL); synchronize_rcu(); kfree(beacon); while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) { local->total_ps_buffered--; dev_kfree_skb(skb); } break; case NL80211_IFTYPE_MESH_POINT: if (ieee80211_vif_is_mesh(&sdata->vif)) mesh_rmc_free(sdata); break; case NL80211_IFTYPE_ADHOC: if (WARN_ON(sdata->u.ibss.presp)) kfree_skb(sdata->u.ibss.presp); break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_MONITOR: break; case NL80211_IFTYPE_UNSPECIFIED: case __NL80211_IFTYPE_AFTER_LAST: BUG(); break; } flushed = sta_info_flush(local, sdata); WARN_ON(flushed); } static u16 ieee80211_netdev_select_queue(struct net_device *dev, struct sk_buff *skb) { return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb); } static const struct net_device_ops ieee80211_dataif_ops = { .ndo_open = ieee80211_open, .ndo_stop = ieee80211_stop, .ndo_uninit = ieee80211_teardown_sdata, .ndo_start_xmit = ieee80211_subif_start_xmit, .ndo_set_multicast_list = ieee80211_set_multicast_list, .ndo_change_mtu = ieee80211_change_mtu, .ndo_set_mac_address = ieee80211_change_mac, .ndo_select_queue = ieee80211_netdev_select_queue, }; static u16 ieee80211_monitor_select_queue(struct net_device *dev, struct sk_buff *skb) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; struct ieee80211_hdr *hdr; struct ieee80211_radiotap_header *rtap = (void *)skb->data; u8 *p; if (local->hw.queues < 4) return 0; if (skb->len < 4 || skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) return 0; /* doesn't matter, frame will be dropped */ hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); if (!ieee80211_is_data(hdr->frame_control)) { skb->priority = 7; return ieee802_1d_to_ac[skb->priority]; } if (!ieee80211_is_data_qos(hdr->frame_control)) { skb->priority = 0; return ieee802_1d_to_ac[skb->priority]; } p = ieee80211_get_qos_ctl(hdr); skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; return ieee80211_downgrade_queue(local, skb); } static const struct net_device_ops ieee80211_monitorif_ops = { .ndo_open = ieee80211_open, .ndo_stop = ieee80211_stop, .ndo_uninit = ieee80211_teardown_sdata, .ndo_start_xmit = ieee80211_monitor_start_xmit, .ndo_set_multicast_list = ieee80211_set_multicast_list, .ndo_change_mtu = ieee80211_change_mtu, .ndo_set_mac_address = eth_mac_addr, .ndo_select_queue = ieee80211_monitor_select_queue, }; static void ieee80211_if_setup(struct net_device *dev) { ether_setup(dev); dev->netdev_ops = &ieee80211_dataif_ops; dev->destructor = free_netdev; } /* * Helper function to initialise an interface to a specific type. */ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata, enum nl80211_iftype type) { /* clear type-dependent union */ memset(&sdata->u, 0, sizeof(sdata->u)); /* and set some type-dependent values */ sdata->vif.type = type; sdata->dev->netdev_ops = &ieee80211_dataif_ops; sdata->wdev.iftype = type; /* only monitor differs */ sdata->dev->type = ARPHRD_ETHER; switch (type) { case NL80211_IFTYPE_AP: skb_queue_head_init(&sdata->u.ap.ps_bc_buf); INIT_LIST_HEAD(&sdata->u.ap.vlans); break; case NL80211_IFTYPE_STATION: ieee80211_sta_setup_sdata(sdata); break; case NL80211_IFTYPE_ADHOC: ieee80211_ibss_setup_sdata(sdata); break; case NL80211_IFTYPE_MESH_POINT: if (ieee80211_vif_is_mesh(&sdata->vif)) ieee80211_mesh_init_sdata(sdata); break; case NL80211_IFTYPE_MONITOR: sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP; sdata->dev->netdev_ops = &ieee80211_monitorif_ops; sdata->u.mntr_flags = MONITOR_FLAG_CONTROL | MONITOR_FLAG_OTHER_BSS; break; case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_AP_VLAN: break; case NL80211_IFTYPE_UNSPECIFIED: case __NL80211_IFTYPE_AFTER_LAST: BUG(); break; } ieee80211_debugfs_add_netdev(sdata); } int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata, enum nl80211_iftype type) { ASSERT_RTNL(); if (type == sdata->vif.type) return 0; /* Setting ad-hoc mode on non-IBSS channel is not supported. */ if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS && type == NL80211_IFTYPE_ADHOC) return -EOPNOTSUPP; /* * We could, here, on changes between IBSS/STA/MESH modes, * invoke an MLME function instead that disassociates etc. * and goes into the requested mode. */ if (ieee80211_sdata_running(sdata)) return -EBUSY; /* Purge and reset type-dependent state. */ ieee80211_teardown_sdata(sdata->dev); ieee80211_setup_sdata(sdata, type); /* reset some values that shouldn't be kept across type changes */ sdata->vif.bss_conf.basic_rates = ieee80211_mandatory_rates(sdata->local, sdata->local->hw.conf.channel->band); sdata->drop_unencrypted = 0; if (type == NL80211_IFTYPE_STATION) sdata->u.mgd.use_4addr = false; return 0; } static void ieee80211_assign_perm_addr(struct ieee80211_local *local, struct net_device *dev, enum nl80211_iftype type) { struct ieee80211_sub_if_data *sdata; u64 mask, start, addr, val, inc; u8 *m; u8 tmp_addr[ETH_ALEN]; int i; /* default ... something at least */ memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN); if (is_zero_ether_addr(local->hw.wiphy->addr_mask) && local->hw.wiphy->n_addresses <= 1) return; mutex_lock(&local->iflist_mtx); switch (type) { case NL80211_IFTYPE_MONITOR: /* doesn't matter */ break; case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_AP_VLAN: /* match up with an AP interface */ list_for_each_entry(sdata, &local->interfaces, list) { if (sdata->vif.type != NL80211_IFTYPE_AP) continue; memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN); break; } /* keep default if no AP interface present */ break; default: /* assign a new address if possible -- try n_addresses first */ for (i = 0; i < local->hw.wiphy->n_addresses; i++) { bool used = false; list_for_each_entry(sdata, &local->interfaces, list) { if (memcmp(local->hw.wiphy->addresses[i].addr, sdata->vif.addr, ETH_ALEN) == 0) { used = true; break; } } if (!used) { memcpy(dev->perm_addr, local->hw.wiphy->addresses[i].addr, ETH_ALEN); break; } } /* try mask if available */ if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) break; m = local->hw.wiphy->addr_mask; mask = ((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); if (__ffs64(mask) + hweight64(mask) != fls64(mask)) { /* not a contiguous mask ... not handled now! */ printk(KERN_DEBUG "not contiguous\n"); break; } m = local->hw.wiphy->perm_addr; 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); inc = 1ULL<<__ffs64(mask); val = (start & mask); addr = (start & ~mask) | (val & mask); do { bool used = false; tmp_addr[5] = addr >> 0*8; tmp_addr[4] = addr >> 1*8; tmp_addr[3] = addr >> 2*8; tmp_addr[2] = addr >> 3*8; tmp_addr[1] = addr >> 4*8; tmp_addr[0] = addr >> 5*8; val += inc; list_for_each_entry(sdata, &local->interfaces, list) { if (memcmp(tmp_addr, sdata->vif.addr, ETH_ALEN) == 0) { used = true; break; } } if (!used) { memcpy(dev->perm_addr, tmp_addr, ETH_ALEN); break; } addr = (start & ~mask) | (val & mask); } while (addr != start); break; } mutex_unlock(&local->iflist_mtx); } int ieee80211_if_add(struct ieee80211_local *local, const char *name, struct net_device **new_dev, enum nl80211_iftype type, struct vif_params *params) { struct net_device *ndev; struct ieee80211_sub_if_data *sdata = NULL; int ret, i; ASSERT_RTNL(); ndev = alloc_netdev_mq(sizeof(*sdata) + local->hw.vif_data_size, name, ieee80211_if_setup, local->hw.queues); if (!ndev) return -ENOMEM; dev_net_set(ndev, wiphy_net(local->hw.wiphy)); ndev->needed_headroom = local->tx_headroom + 4*6 /* four MAC addresses */ + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */ + 6 /* mesh */ + 8 /* rfc1042/bridge tunnel */ - ETH_HLEN /* ethernet hard_header_len */ + IEEE80211_ENCRYPT_HEADROOM; ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM; ret = dev_alloc_name(ndev, ndev->name); if (ret < 0) goto fail; ieee80211_assign_perm_addr(local, ndev, type); memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN); SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy)); /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */ sdata = netdev_priv(ndev); ndev->ieee80211_ptr = &sdata->wdev; memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN); memcpy(sdata->name, ndev->name, IFNAMSIZ); /* initialise type-independent data */ sdata->wdev.wiphy = local->hw.wiphy; sdata->local = local; sdata->dev = ndev; for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) skb_queue_head_init(&sdata->fragments[i].skb_list); INIT_LIST_HEAD(&sdata->key_list); for (i = 0; i < IEEE80211_NUM_BANDS; i++) { struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[i]; sdata->rc_rateidx_mask[i] = sband ? (1 << sband->n_bitrates) - 1 : 0; } /* setup type-dependent data */ ieee80211_setup_sdata(sdata, type); if (params) { ndev->ieee80211_ptr->use_4addr = params->use_4addr; if (type == NL80211_IFTYPE_STATION) sdata->u.mgd.use_4addr = params->use_4addr; } ret = register_netdevice(ndev); if (ret) goto fail; if (ieee80211_vif_is_mesh(&sdata->vif) && params && params->mesh_id_len) ieee80211_sdata_set_mesh_id(sdata, params->mesh_id_len, params->mesh_id); mutex_lock(&local->iflist_mtx); list_add_tail_rcu(&sdata->list, &local->interfaces); mutex_unlock(&local->iflist_mtx); if (new_dev) *new_dev = ndev; return 0; fail: free_netdev(ndev); return ret; } void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) { ASSERT_RTNL(); mutex_lock(&sdata->local->iflist_mtx); list_del_rcu(&sdata->list); mutex_unlock(&sdata->local->iflist_mtx); synchronize_rcu(); unregister_netdevice(sdata->dev); } /* * Remove all interfaces, may only be called at hardware unregistration * time because it doesn't do RCU-safe list removals. */ void ieee80211_remove_interfaces(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata, *tmp; LIST_HEAD(unreg_list); ASSERT_RTNL(); mutex_lock(&local->iflist_mtx); list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { list_del(&sdata->list); unregister_netdevice_queue(sdata->dev, &unreg_list); } mutex_unlock(&local->iflist_mtx); unregister_netdevice_many(&unreg_list); } static u32 ieee80211_idle_off(struct ieee80211_local *local, const char *reason) { if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE)) return 0; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: device no longer idle - %s\n", wiphy_name(local->hw.wiphy), reason); #endif local->hw.conf.flags &= ~IEEE80211_CONF_IDLE; return IEEE80211_CONF_CHANGE_IDLE; } static u32 ieee80211_idle_on(struct ieee80211_local *local) { if (local->hw.conf.flags & IEEE80211_CONF_IDLE) return 0; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: device now idle\n", wiphy_name(local->hw.wiphy)); #endif drv_flush(local, false); local->hw.conf.flags |= IEEE80211_CONF_IDLE; return IEEE80211_CONF_CHANGE_IDLE; } u32 __ieee80211_recalc_idle(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; int count = 0; if (!list_empty(&local->work_list)) return ieee80211_idle_off(local, "working"); if (local->scanning) return ieee80211_idle_off(local, "scanning"); list_for_each_entry(sdata, &local->interfaces, list) { if (!ieee80211_sdata_running(sdata)) continue; /* do not count disabled managed interfaces */ if (sdata->vif.type == NL80211_IFTYPE_STATION && !sdata->u.mgd.associated) continue; /* do not count unused IBSS interfaces */ if (sdata->vif.type == NL80211_IFTYPE_ADHOC && !sdata->u.ibss.ssid_len) continue; /* count everything else */ count++; } if (!count) return ieee80211_idle_on(local); else return ieee80211_idle_off(local, "in use"); return 0; } void ieee80211_recalc_idle(struct ieee80211_local *local) { u32 chg; mutex_lock(&local->iflist_mtx); chg = __ieee80211_recalc_idle(local); mutex_unlock(&local->iflist_mtx); if (chg) ieee80211_hw_config(local, chg); } static int netdev_notify(struct notifier_block *nb, unsigned long state, void *ndev) { struct net_device *dev = ndev; struct ieee80211_sub_if_data *sdata; if (state != NETDEV_CHANGENAME) return 0; if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy) return 0; if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) return 0; sdata = IEEE80211_DEV_TO_SUB_IF(dev); memcpy(sdata->name, dev->name, IFNAMSIZ); ieee80211_debugfs_rename_netdev(sdata); return 0; } static struct notifier_block mac80211_netdev_notifier = { .notifier_call = netdev_notify, }; int ieee80211_iface_init(void) { return register_netdevice_notifier(&mac80211_netdev_notifier); } void ieee80211_iface_exit(void) { unregister_netdevice_notifier(&mac80211_netdev_notifier); }