/* * This is the linux wireless configuration interface. * * Copyright 2006-2010 Johannes Berg */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nl80211.h" #include "core.h" #include "sysfs.h" #include "debugfs.h" #include "wext-compat.h" #include "ethtool.h" #include "rdev-ops.h" /* name for sysfs, %d is appended */ #define PHY_NAME "phy" MODULE_AUTHOR("Johannes Berg"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("wireless configuration support"); /* RCU-protected (and cfg80211_mutex for writers) */ LIST_HEAD(cfg80211_rdev_list); int cfg80211_rdev_list_generation; DEFINE_MUTEX(cfg80211_mutex); /* for debugfs */ static struct dentry *ieee80211_debugfs_dir; /* for the cleanup, scan and event works */ struct workqueue_struct *cfg80211_wq; static bool cfg80211_disable_40mhz_24ghz; module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, "Disable 40MHz support in the 2.4GHz band"); /* requires cfg80211_mutex to be held! */ struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) { struct cfg80211_registered_device *result = NULL, *rdev; assert_cfg80211_lock(); list_for_each_entry(rdev, &cfg80211_rdev_list, list) { if (rdev->wiphy_idx == wiphy_idx) { result = rdev; break; } } return result; } int get_wiphy_idx(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); return rdev->wiphy_idx; } /* requires cfg80211_rdev_mutex to be held! */ struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) { struct cfg80211_registered_device *rdev; assert_cfg80211_lock(); rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); if (!rdev) return NULL; return &rdev->wiphy; } struct cfg80211_registered_device * cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) { struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV); struct net_device *dev; mutex_lock(&cfg80211_mutex); dev = dev_get_by_index(net, ifindex); if (!dev) goto out; if (dev->ieee80211_ptr) { rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); mutex_lock(&rdev->mtx); } else rdev = ERR_PTR(-ENODEV); dev_put(dev); out: mutex_unlock(&cfg80211_mutex); return rdev; } /* requires cfg80211_mutex to be held */ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, char *newname) { struct cfg80211_registered_device *rdev2; int wiphy_idx, taken = -1, result, digits; assert_cfg80211_lock(); /* prohibit calling the thing phy%d when %d is not its number */ sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { /* count number of places needed to print wiphy_idx */ digits = 1; while (wiphy_idx /= 10) digits++; /* * deny the name if it is phy where is printed * without leading zeroes. taken == strlen(newname) here */ if (taken == strlen(PHY_NAME) + digits) return -EINVAL; } /* Ignore nop renames */ if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0) return 0; /* Ensure another device does not already have this name. */ list_for_each_entry(rdev2, &cfg80211_rdev_list, list) if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0) return -EINVAL; result = device_rename(&rdev->wiphy.dev, newname); if (result) return result; if (rdev->wiphy.debugfsdir && !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, rdev->wiphy.debugfsdir, rdev->wiphy.debugfsdir->d_parent, newname)) pr_err("failed to rename debugfs dir to %s!\n", newname); nl80211_notify_dev_rename(rdev); return 0; } int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, struct net *net) { struct wireless_dev *wdev; int err = 0; if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) return -EOPNOTSUPP; list_for_each_entry(wdev, &rdev->wdev_list, list) { if (!wdev->netdev) continue; wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); if (err) break; wdev->netdev->features |= NETIF_F_NETNS_LOCAL; } if (err) { /* failed -- clean up to old netns */ net = wiphy_net(&rdev->wiphy); list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list, list) { if (!wdev->netdev) continue; wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); WARN_ON(err); wdev->netdev->features |= NETIF_F_NETNS_LOCAL; } return err; } wiphy_net_set(&rdev->wiphy, net); err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); WARN_ON(err); return 0; } static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) { struct cfg80211_registered_device *rdev = data; rdev_rfkill_poll(rdev); } void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { lockdep_assert_held(&rdev->devlist_mtx); lockdep_assert_held(&rdev->sched_scan_mtx); if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) return; if (!wdev->p2p_started) return; rdev_stop_p2p_device(rdev, wdev); wdev->p2p_started = false; rdev->opencount--; if (rdev->scan_req && rdev->scan_req->wdev == wdev) { bool busy = work_busy(&rdev->scan_done_wk); /* * If the work isn't pending or running (in which case it would * be waiting for the lock we hold) the driver didn't properly * cancel the scan when the interface was removed. In this case * warn and leak the scan request object to not crash later. */ WARN_ON(!busy); rdev->scan_req->aborted = true; ___cfg80211_scan_done(rdev, !busy); } } static int cfg80211_rfkill_set_block(void *data, bool blocked) { struct cfg80211_registered_device *rdev = data; struct wireless_dev *wdev; if (!blocked) return 0; rtnl_lock(); /* read-only iteration need not hold the devlist_mtx */ list_for_each_entry(wdev, &rdev->wdev_list, list) { if (wdev->netdev) { dev_close(wdev->netdev); continue; } /* otherwise, check iftype */ switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: /* but this requires it */ mutex_lock(&rdev->devlist_mtx); mutex_lock(&rdev->sched_scan_mtx); cfg80211_stop_p2p_device(rdev, wdev); mutex_unlock(&rdev->sched_scan_mtx); mutex_unlock(&rdev->devlist_mtx); break; default: break; } } rtnl_unlock(); return 0; } static void cfg80211_rfkill_sync_work(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); } static void cfg80211_event_work(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, event_work); rtnl_lock(); cfg80211_lock_rdev(rdev); cfg80211_process_rdev_events(rdev); cfg80211_unlock_rdev(rdev); rtnl_unlock(); } /* exported functions */ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) { static int wiphy_counter; struct cfg80211_registered_device *rdev; int alloc_size; WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); WARN_ON(ops->connect && !ops->disconnect); WARN_ON(ops->join_ibss && !ops->leave_ibss); WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); WARN_ON(ops->add_station && !ops->del_station); WARN_ON(ops->add_mpath && !ops->del_mpath); WARN_ON(ops->join_mesh && !ops->leave_mesh); alloc_size = sizeof(*rdev) + sizeof_priv; rdev = kzalloc(alloc_size, GFP_KERNEL); if (!rdev) return NULL; rdev->ops = ops; mutex_lock(&cfg80211_mutex); rdev->wiphy_idx = wiphy_counter++; if (unlikely(rdev->wiphy_idx < 0)) { wiphy_counter--; mutex_unlock(&cfg80211_mutex); /* ugh, wrapped! */ kfree(rdev); return NULL; } mutex_unlock(&cfg80211_mutex); /* give it a proper name */ dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); mutex_init(&rdev->mtx); mutex_init(&rdev->devlist_mtx); mutex_init(&rdev->sched_scan_mtx); INIT_LIST_HEAD(&rdev->wdev_list); INIT_LIST_HEAD(&rdev->beacon_registrations); spin_lock_init(&rdev->beacon_registrations_lock); spin_lock_init(&rdev->bss_lock); INIT_LIST_HEAD(&rdev->bss_list); INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, cfg80211_dfs_channels_update_work); #ifdef CONFIG_CFG80211_WEXT rdev->wiphy.wext = &cfg80211_wext_handler; #endif device_initialize(&rdev->wiphy.dev); rdev->wiphy.dev.class = &ieee80211_class; rdev->wiphy.dev.platform_data = rdev; #ifdef CONFIG_CFG80211_DEFAULT_PS rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; #endif wiphy_net_set(&rdev->wiphy, &init_net); rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), &rdev->wiphy.dev, RFKILL_TYPE_WLAN, &rdev->rfkill_ops, rdev); if (!rdev->rfkill) { kfree(rdev); return NULL; } INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); INIT_WORK(&rdev->conn_work, cfg80211_conn_work); INIT_WORK(&rdev->event_work, cfg80211_event_work); init_waitqueue_head(&rdev->dev_wait); /* * Initialize wiphy parameters to IEEE 802.11 MIB default values. * Fragmentation and RTS threshold are disabled by default with the * special -1 value. */ rdev->wiphy.retry_short = 7; rdev->wiphy.retry_long = 4; rdev->wiphy.frag_threshold = (u32) -1; rdev->wiphy.rts_threshold = (u32) -1; rdev->wiphy.coverage_class = 0; rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH; return &rdev->wiphy; } EXPORT_SYMBOL(wiphy_new); static int wiphy_verify_combinations(struct wiphy *wiphy) { const struct ieee80211_iface_combination *c; int i, j; for (i = 0; i < wiphy->n_iface_combinations; i++) { u32 cnt = 0; u16 all_iftypes = 0; c = &wiphy->iface_combinations[i]; /* * Combinations with just one interface aren't real, * however we make an exception for DFS. */ if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) return -EINVAL; /* Need at least one channel */ if (WARN_ON(!c->num_different_channels)) return -EINVAL; /* * Put a sane limit on maximum number of different * channels to simplify channel accounting code. */ if (WARN_ON(c->num_different_channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) return -EINVAL; /* DFS only works on one channel. */ if (WARN_ON(c->radar_detect_widths && (c->num_different_channels > 1))) return -EINVAL; if (WARN_ON(!c->n_limits)) return -EINVAL; for (j = 0; j < c->n_limits; j++) { u16 types = c->limits[j].types; /* * interface types shouldn't overlap, this is * used in cfg80211_can_change_interface() */ if (WARN_ON(types & all_iftypes)) return -EINVAL; all_iftypes |= types; if (WARN_ON(!c->limits[j].max)) return -EINVAL; /* Shouldn't list software iftypes in combinations! */ if (WARN_ON(wiphy->software_iftypes & types)) return -EINVAL; /* Only a single P2P_DEVICE can be allowed */ if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && c->limits[j].max > 1)) return -EINVAL; cnt += c->limits[j].max; /* * Don't advertise an unsupported type * in a combination. */ if (WARN_ON((wiphy->interface_modes & types) != types)) return -EINVAL; } /* You can't even choose that many! */ if (WARN_ON(cnt < c->max_interfaces)) return -EINVAL; } return 0; } int wiphy_register(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); int res; enum ieee80211_band band; struct ieee80211_supported_band *sband; bool have_band = false; int i; u16 ifmodes = wiphy->interface_modes; #ifdef CONFIG_PM if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) return -EINVAL; #endif if (WARN_ON(wiphy->ap_sme_capa && !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) return -EINVAL; if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) return -EINVAL; if (WARN_ON(wiphy->addresses && !is_zero_ether_addr(wiphy->perm_addr) && memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN))) return -EINVAL; if (WARN_ON(wiphy->max_acl_mac_addrs && (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || !rdev->ops->set_mac_acl))) return -EINVAL; if (wiphy->addresses) memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); /* sanity check ifmodes */ WARN_ON(!ifmodes); ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; if (WARN_ON(ifmodes != wiphy->interface_modes)) wiphy->interface_modes = ifmodes; res = wiphy_verify_combinations(wiphy); if (res) return res; /* sanity check supported bands/channels */ for (band = 0; band < IEEE80211_NUM_BANDS; band++) { sband = wiphy->bands[band]; if (!sband) continue; sband->band = band; if (WARN_ON(!sband->n_channels)) return -EINVAL; /* * on 60gHz band, there are no legacy rates, so * n_bitrates is 0 */ if (WARN_ON(band != IEEE80211_BAND_60GHZ && !sband->n_bitrates)) return -EINVAL; /* * Since cfg80211_disable_40mhz_24ghz is global, we can * modify the sband's ht data even if the driver uses a * global structure for that. */ if (cfg80211_disable_40mhz_24ghz && band == IEEE80211_BAND_2GHZ && sband->ht_cap.ht_supported) { sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; } /* * Since we use a u32 for rate bitmaps in * ieee80211_get_response_rate, we cannot * have more than 32 legacy rates. */ if (WARN_ON(sband->n_bitrates > 32)) return -EINVAL; for (i = 0; i < sband->n_channels; i++) { sband->channels[i].orig_flags = sband->channels[i].flags; sband->channels[i].orig_mag = INT_MAX; sband->channels[i].orig_mpwr = sband->channels[i].max_power; sband->channels[i].band = band; } have_band = true; } if (!have_band) { WARN_ON(1); return -EINVAL; } #ifdef CONFIG_PM if (rdev->wiphy.wowlan.n_patterns) { if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len || rdev->wiphy.wowlan.pattern_min_len > rdev->wiphy.wowlan.pattern_max_len)) return -EINVAL; } #endif /* check and set up bitrates */ ieee80211_set_bitrate_flags(wiphy); mutex_lock(&cfg80211_mutex); res = device_add(&rdev->wiphy.dev); if (res) { mutex_unlock(&cfg80211_mutex); return res; } /* set up regulatory info */ wiphy_regulatory_register(wiphy); list_add_rcu(&rdev->list, &cfg80211_rdev_list); cfg80211_rdev_list_generation++; /* add to debugfs */ rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), ieee80211_debugfs_dir); if (IS_ERR(rdev->wiphy.debugfsdir)) rdev->wiphy.debugfsdir = NULL; if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { struct regulatory_request request; request.wiphy_idx = get_wiphy_idx(wiphy); request.initiator = NL80211_REGDOM_SET_BY_DRIVER; request.alpha2[0] = '9'; request.alpha2[1] = '9'; nl80211_send_reg_change_event(&request); } cfg80211_debugfs_rdev_add(rdev); mutex_unlock(&cfg80211_mutex); /* * due to a locking dependency this has to be outside of the * cfg80211_mutex lock */ res = rfkill_register(rdev->rfkill); if (res) { device_del(&rdev->wiphy.dev); mutex_lock(&cfg80211_mutex); debugfs_remove_recursive(rdev->wiphy.debugfsdir); list_del_rcu(&rdev->list); wiphy_regulatory_deregister(wiphy); mutex_unlock(&cfg80211_mutex); return res; } rtnl_lock(); rdev->wiphy.registered = true; rtnl_unlock(); return 0; } EXPORT_SYMBOL(wiphy_register); void wiphy_rfkill_start_polling(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); if (!rdev->ops->rfkill_poll) return; rdev->rfkill_ops.poll = cfg80211_rfkill_poll; rfkill_resume_polling(rdev->rfkill); } EXPORT_SYMBOL(wiphy_rfkill_start_polling); void wiphy_rfkill_stop_polling(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); rfkill_pause_polling(rdev->rfkill); } EXPORT_SYMBOL(wiphy_rfkill_stop_polling); void wiphy_unregister(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); rtnl_lock(); rdev->wiphy.registered = false; rtnl_unlock(); rfkill_unregister(rdev->rfkill); /* protect the device list */ mutex_lock(&cfg80211_mutex); wait_event(rdev->dev_wait, ({ int __count; mutex_lock(&rdev->devlist_mtx); __count = rdev->opencount; mutex_unlock(&rdev->devlist_mtx); __count == 0; })); mutex_lock(&rdev->devlist_mtx); BUG_ON(!list_empty(&rdev->wdev_list)); mutex_unlock(&rdev->devlist_mtx); /* * First remove the hardware from everywhere, this makes * it impossible to find from userspace. */ debugfs_remove_recursive(rdev->wiphy.debugfsdir); list_del_rcu(&rdev->list); synchronize_rcu(); /* * Try to grab rdev->mtx. If a command is still in progress, * hopefully the driver will refuse it since it's tearing * down the device already. We wait for this command to complete * before unlinking the item from the list. * Note: as codified by the BUG_ON above we cannot get here if * a virtual interface is still present. Hence, we can only get * to lock contention here if userspace issues a command that * identified the hardware by wiphy index. */ cfg80211_lock_rdev(rdev); /* nothing */ cfg80211_unlock_rdev(rdev); /* * If this device got a regulatory hint tell core its * free to listen now to a new shiny device regulatory hint */ wiphy_regulatory_deregister(wiphy); cfg80211_rdev_list_generation++; device_del(&rdev->wiphy.dev); mutex_unlock(&cfg80211_mutex); flush_work(&rdev->scan_done_wk); cancel_work_sync(&rdev->conn_work); flush_work(&rdev->event_work); cancel_delayed_work_sync(&rdev->dfs_update_channels_wk); if (rdev->wowlan && rdev->ops->set_wakeup) rdev_set_wakeup(rdev, false); cfg80211_rdev_free_wowlan(rdev); } EXPORT_SYMBOL(wiphy_unregister); void cfg80211_dev_free(struct cfg80211_registered_device *rdev) { struct cfg80211_internal_bss *scan, *tmp; struct cfg80211_beacon_registration *reg, *treg; rfkill_destroy(rdev->rfkill); mutex_destroy(&rdev->mtx); mutex_destroy(&rdev->devlist_mtx); mutex_destroy(&rdev->sched_scan_mtx); list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { list_del(®->list); kfree(reg); } list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list) cfg80211_put_bss(&rdev->wiphy, &scan->pub); kfree(rdev); } void wiphy_free(struct wiphy *wiphy) { put_device(&wiphy->dev); } EXPORT_SYMBOL(wiphy_free); void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); if (rfkill_set_hw_state(rdev->rfkill, blocked)) schedule_work(&rdev->rfkill_sync); } EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); static void wdev_cleanup_work(struct work_struct *work) { struct wireless_dev *wdev; struct cfg80211_registered_device *rdev; wdev = container_of(work, struct wireless_dev, cleanup_work); rdev = wiphy_to_dev(wdev->wiphy); mutex_lock(&rdev->sched_scan_mtx); if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) { rdev->scan_req->aborted = true; ___cfg80211_scan_done(rdev, true); } if (WARN_ON(rdev->sched_scan_req && rdev->sched_scan_req->dev == wdev->netdev)) { __cfg80211_stop_sched_scan(rdev, false); } mutex_unlock(&rdev->sched_scan_mtx); mutex_lock(&rdev->devlist_mtx); rdev->opencount--; mutex_unlock(&rdev->devlist_mtx); wake_up(&rdev->dev_wait); dev_put(wdev->netdev); } void cfg80211_unregister_wdev(struct wireless_dev *wdev) { struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); ASSERT_RTNL(); if (WARN_ON(wdev->netdev)) return; mutex_lock(&rdev->devlist_mtx); mutex_lock(&rdev->sched_scan_mtx); list_del_rcu(&wdev->list); rdev->devlist_generation++; switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: cfg80211_stop_p2p_device(rdev, wdev); break; default: WARN_ON_ONCE(1); break; } mutex_unlock(&rdev->sched_scan_mtx); mutex_unlock(&rdev->devlist_mtx); } EXPORT_SYMBOL(cfg80211_unregister_wdev); static struct device_type wiphy_type = { .name = "wlan", }; void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev, enum nl80211_iftype iftype, int num) { ASSERT_RTNL(); rdev->num_running_ifaces += num; if (iftype == NL80211_IFTYPE_MONITOR) rdev->num_running_monitor_ifaces += num; } void cfg80211_leave(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { struct net_device *dev = wdev->netdev; switch (wdev->iftype) { case NL80211_IFTYPE_ADHOC: cfg80211_leave_ibss(rdev, dev, true); break; case NL80211_IFTYPE_P2P_CLIENT: case NL80211_IFTYPE_STATION: mutex_lock(&rdev->sched_scan_mtx); __cfg80211_stop_sched_scan(rdev, false); mutex_unlock(&rdev->sched_scan_mtx); wdev_lock(wdev); #ifdef CONFIG_CFG80211_WEXT kfree(wdev->wext.ie); wdev->wext.ie = NULL; wdev->wext.ie_len = 0; wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; #endif __cfg80211_disconnect(rdev, dev, WLAN_REASON_DEAUTH_LEAVING, true); cfg80211_mlme_down(rdev, dev); wdev_unlock(wdev); break; case NL80211_IFTYPE_MESH_POINT: cfg80211_leave_mesh(rdev, dev); break; case NL80211_IFTYPE_AP: cfg80211_stop_ap(rdev, dev); break; default: break; } wdev->beacon_interval = 0; } static int cfg80211_netdev_notifier_call(struct notifier_block *nb, unsigned long state, void *ndev) { struct net_device *dev = ndev; struct wireless_dev *wdev = dev->ieee80211_ptr; struct cfg80211_registered_device *rdev; int ret; if (!wdev) return NOTIFY_DONE; rdev = wiphy_to_dev(wdev->wiphy); WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED); switch (state) { case NETDEV_POST_INIT: SET_NETDEV_DEVTYPE(dev, &wiphy_type); break; case NETDEV_REGISTER: /* * NB: cannot take rdev->mtx here because this may be * called within code protected by it when interfaces * are added with nl80211. */ mutex_init(&wdev->mtx); INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); INIT_LIST_HEAD(&wdev->event_list); spin_lock_init(&wdev->event_lock); INIT_LIST_HEAD(&wdev->mgmt_registrations); spin_lock_init(&wdev->mgmt_registrations_lock); mutex_lock(&rdev->devlist_mtx); wdev->identifier = ++rdev->wdev_id; list_add_rcu(&wdev->list, &rdev->wdev_list); rdev->devlist_generation++; /* can only change netns with wiphy */ dev->features |= NETIF_F_NETNS_LOCAL; if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj, "phy80211")) { pr_err("failed to add phy80211 symlink to netdev!\n"); } wdev->netdev = dev; wdev->sme_state = CFG80211_SME_IDLE; mutex_unlock(&rdev->devlist_mtx); #ifdef CONFIG_CFG80211_WEXT wdev->wext.default_key = -1; wdev->wext.default_mgmt_key = -1; wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC; #endif if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT) wdev->ps = true; else wdev->ps = false; /* allow mac80211 to determine the timeout */ wdev->ps_timeout = -1; netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops); if ((wdev->iftype == NL80211_IFTYPE_STATION || wdev->iftype == NL80211_IFTYPE_P2P_CLIENT || wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr) dev->priv_flags |= IFF_DONT_BRIDGE; break; case NETDEV_GOING_DOWN: cfg80211_leave(rdev, wdev); break; case NETDEV_DOWN: cfg80211_update_iface_num(rdev, wdev->iftype, -1); dev_hold(dev); queue_work(cfg80211_wq, &wdev->cleanup_work); break; case NETDEV_UP: /* * If we have a really quick DOWN/UP succession we may * have this work still pending ... cancel it and see * if it was pending, in which case we need to account * for some of the work it would have done. */ if (cancel_work_sync(&wdev->cleanup_work)) { mutex_lock(&rdev->devlist_mtx); rdev->opencount--; mutex_unlock(&rdev->devlist_mtx); dev_put(dev); } cfg80211_update_iface_num(rdev, wdev->iftype, 1); cfg80211_lock_rdev(rdev); mutex_lock(&rdev->devlist_mtx); mutex_lock(&rdev->sched_scan_mtx); wdev_lock(wdev); switch (wdev->iftype) { #ifdef CONFIG_CFG80211_WEXT case NL80211_IFTYPE_ADHOC: cfg80211_ibss_wext_join(rdev, wdev); break; case NL80211_IFTYPE_STATION: cfg80211_mgd_wext_connect(rdev, wdev); break; #endif #ifdef CONFIG_MAC80211_MESH case NL80211_IFTYPE_MESH_POINT: { /* backward compat code... */ struct mesh_setup setup; memcpy(&setup, &default_mesh_setup, sizeof(setup)); /* back compat only needed for mesh_id */ setup.mesh_id = wdev->ssid; setup.mesh_id_len = wdev->mesh_id_up_len; if (wdev->mesh_id_up_len) __cfg80211_join_mesh(rdev, dev, &setup, &default_mesh_config); break; } #endif default: break; } wdev_unlock(wdev); mutex_unlock(&rdev->sched_scan_mtx); rdev->opencount++; mutex_unlock(&rdev->devlist_mtx); cfg80211_unlock_rdev(rdev); /* * Configure power management to the driver here so that its * correctly set also after interface type changes etc. */ if ((wdev->iftype == NL80211_IFTYPE_STATION || wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) && rdev->ops->set_power_mgmt) if (rdev_set_power_mgmt(rdev, dev, wdev->ps, wdev->ps_timeout)) { /* assume this means it's off */ wdev->ps = false; } break; case NETDEV_UNREGISTER: /* * NB: cannot take rdev->mtx here because this may be * called within code protected by it when interfaces * are removed with nl80211. */ mutex_lock(&rdev->devlist_mtx); /* * It is possible to get NETDEV_UNREGISTER * multiple times. To detect that, check * that the interface is still on the list * of registered interfaces, and only then * remove and clean it up. */ if (!list_empty(&wdev->list)) { sysfs_remove_link(&dev->dev.kobj, "phy80211"); list_del_rcu(&wdev->list); rdev->devlist_generation++; cfg80211_mlme_purge_registrations(wdev); #ifdef CONFIG_CFG80211_WEXT kfree(wdev->wext.keys); #endif } mutex_unlock(&rdev->devlist_mtx); /* * synchronise (so that we won't find this netdev * from other code any more) and then clear the list * head so that the above code can safely check for * !list_empty() to avoid double-cleanup. */ synchronize_rcu(); INIT_LIST_HEAD(&wdev->list); /* * Ensure that all events have been processed and * freed. */ cfg80211_process_wdev_events(wdev); break; case NETDEV_PRE_UP: if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) return notifier_from_errno(-EOPNOTSUPP); if (rfkill_blocked(rdev->rfkill)) return notifier_from_errno(-ERFKILL); mutex_lock(&rdev->devlist_mtx); ret = cfg80211_can_add_interface(rdev, wdev->iftype); mutex_unlock(&rdev->devlist_mtx); if (ret) return notifier_from_errno(ret); break; } return NOTIFY_DONE; } static struct notifier_block cfg80211_netdev_notifier = { .notifier_call = cfg80211_netdev_notifier_call, }; static void __net_exit cfg80211_pernet_exit(struct net *net) { struct cfg80211_registered_device *rdev; rtnl_lock(); mutex_lock(&cfg80211_mutex); list_for_each_entry(rdev, &cfg80211_rdev_list, list) { if (net_eq(wiphy_net(&rdev->wiphy), net)) WARN_ON(cfg80211_switch_netns(rdev, &init_net)); } mutex_unlock(&cfg80211_mutex); rtnl_unlock(); } static struct pernet_operations cfg80211_pernet_ops = { .exit = cfg80211_pernet_exit, }; static int __init cfg80211_init(void) { int err; err = register_pernet_device(&cfg80211_pernet_ops); if (err) goto out_fail_pernet; err = wiphy_sysfs_init(); if (err) goto out_fail_sysfs; err = register_netdevice_notifier(&cfg80211_netdev_notifier); if (err) goto out_fail_notifier; err = nl80211_init(); if (err) goto out_fail_nl80211; ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL); err = regulatory_init(); if (err) goto out_fail_reg; cfg80211_wq = create_singlethread_workqueue("cfg80211"); if (!cfg80211_wq) { err = -ENOMEM; goto out_fail_wq; } return 0; out_fail_wq: regulatory_exit(); out_fail_reg: debugfs_remove(ieee80211_debugfs_dir); out_fail_nl80211: unregister_netdevice_notifier(&cfg80211_netdev_notifier); out_fail_notifier: wiphy_sysfs_exit(); out_fail_sysfs: unregister_pernet_device(&cfg80211_pernet_ops); out_fail_pernet: return err; } subsys_initcall(cfg80211_init); static void __exit cfg80211_exit(void) { debugfs_remove(ieee80211_debugfs_dir); nl80211_exit(); unregister_netdevice_notifier(&cfg80211_netdev_notifier); wiphy_sysfs_exit(); regulatory_exit(); unregister_pernet_device(&cfg80211_pernet_ops); destroy_workqueue(cfg80211_wq); } module_exit(cfg80211_exit);