| /* |
| * This is the linux wireless configuration interface. |
| * |
| * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/if.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <linux/slab.h> |
| #include <linux/nl80211.h> |
| #include <linux/debugfs.h> |
| #include <linux/notifier.h> |
| #include <linux/device.h> |
| #include <linux/etherdevice.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/sched.h> |
| #include <net/genetlink.h> |
| #include <net/cfg80211.h> |
| #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<idx> where <idx> 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; |
| } |
| |
| 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: |
| 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: |
| case NL80211_IFTYPE_P2P_GO: |
| cfg80211_stop_ap(rdev, dev); |
| break; |
| default: |
| break; |
| } |
| wdev->beacon_interval = 0; |
| 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); |