/* * This is the linux wireless configuration interface. * * Copyright 2006-2010 Johannes Berg * Copyright 2013-2014 Intel Mobile Communications GmbH * Copyright 2015-2017 Intel Deutschland GmbH */ #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 "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"); MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME); /* RCU-protected (and RTNL for writers) */ LIST_HEAD(cfg80211_rdev_list); int cfg80211_rdev_list_generation; /* 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"); struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) { struct cfg80211_registered_device *result = NULL, *rdev; ASSERT_RTNL(); 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_rdev(wiphy); return rdev->wiphy_idx; } struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) { struct cfg80211_registered_device *rdev; ASSERT_RTNL(); rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); if (!rdev) return NULL; return &rdev->wiphy; } static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, const char *newname) { struct cfg80211_registered_device *rdev2; int wiphy_idx, taken = -1, digits; ASSERT_RTNL(); if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN) return -EINVAL; /* 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; } /* Ensure another device does not already have this name. */ list_for_each_entry(rdev2, &cfg80211_rdev_list, list) if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) return -EINVAL; return 0; } int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, char *newname) { int result; ASSERT_RTNL(); /* Ignore nop renames */ if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) return 0; result = cfg80211_dev_check_name(rdev, newname); if (result < 0) return result; 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_wiphy(rdev, NL80211_CMD_NEW_WIPHY); 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->wiphy.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->wiphy.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) { ASSERT_RTNL(); if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) return; if (!wdev_running(wdev)) return; rdev_stop_p2p_device(rdev, wdev); wdev->is_running = false; rdev->opencount--; if (rdev->scan_req && rdev->scan_req->wdev == wdev) { if (WARN_ON(!rdev->scan_req->notified)) rdev->scan_req->info.aborted = true; ___cfg80211_scan_done(rdev, false); } } void cfg80211_stop_nan(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { ASSERT_RTNL(); if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN)) return; if (!wdev_running(wdev)) return; rdev_stop_nan(rdev, wdev); wdev->is_running = false; rdev->opencount--; } void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); struct wireless_dev *wdev; ASSERT_RTNL(); list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { if (wdev->netdev) { dev_close(wdev->netdev); continue; } /* otherwise, check iftype */ switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: cfg80211_stop_p2p_device(rdev, wdev); break; case NL80211_IFTYPE_NAN: cfg80211_stop_nan(rdev, wdev); break; default: break; } } } EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces); static int cfg80211_rfkill_set_block(void *data, bool blocked) { struct cfg80211_registered_device *rdev = data; if (!blocked) return 0; rtnl_lock(); cfg80211_shutdown_all_interfaces(&rdev->wiphy); 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_process_rdev_events(rdev); rtnl_unlock(); } void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) { struct wireless_dev *wdev, *tmp; ASSERT_RTNL(); list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { if (wdev->nl_owner_dead) rdev_del_virtual_intf(rdev, wdev); } } static void cfg80211_destroy_iface_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, destroy_work); rtnl_lock(); cfg80211_destroy_ifaces(rdev); rtnl_unlock(); } static void cfg80211_sched_scan_stop_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; struct cfg80211_sched_scan_request *req, *tmp; rdev = container_of(work, struct cfg80211_registered_device, sched_scan_stop_wk); rtnl_lock(); list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { if (req->nl_owner_dead) cfg80211_stop_sched_scan_req(rdev, req, false); } rtnl_unlock(); } static void cfg80211_propagate_radar_detect_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, propagate_radar_detect_wk); rtnl_lock(); regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef, NL80211_DFS_UNAVAILABLE, NL80211_RADAR_DETECTED); rtnl_unlock(); } static void cfg80211_propagate_cac_done_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, propagate_cac_done_wk); rtnl_lock(); regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef, NL80211_DFS_AVAILABLE, NL80211_RADAR_CAC_FINISHED); rtnl_unlock(); } /* exported functions */ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, const char *requested_name) { static atomic_t wiphy_counter = ATOMIC_INIT(0); 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); WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); WARN_ON(ops->start_ap && !ops->stop_ap); WARN_ON(ops->join_ocb && !ops->leave_ocb); WARN_ON(ops->suspend && !ops->resume); WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); alloc_size = sizeof(*rdev) + sizeof_priv; rdev = kzalloc(alloc_size, GFP_KERNEL); if (!rdev) return NULL; rdev->ops = ops; rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); if (unlikely(rdev->wiphy_idx < 0)) { /* ugh, wrapped! */ atomic_dec(&wiphy_counter); kfree(rdev); return NULL; } /* atomic_inc_return makes it start at 1, make it start at 0 */ rdev->wiphy_idx--; /* give it a proper name */ if (requested_name && requested_name[0]) { int rv; rtnl_lock(); rv = cfg80211_dev_check_name(rdev, requested_name); if (rv < 0) { rtnl_unlock(); goto use_default_name; } rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); rtnl_unlock(); if (rv) goto use_default_name; } else { int rv; use_default_name: /* NOTE: This is *probably* safe w/out holding rtnl because of * the restrictions on phy names. Probably this call could * fail if some other part of the kernel (re)named a device * phyX. But, might should add some locking and check return * value, and use a different name if this one exists? */ rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); if (rv < 0) { kfree(rdev); return NULL; } } INIT_LIST_HEAD(&rdev->wiphy.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_LIST_HEAD(&rdev->sched_scan_req_list); INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); INIT_LIST_HEAD(&rdev->mlme_unreg); spin_lock_init(&rdev->mlme_unreg_lock); INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); 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; device_enable_async_suspend(&rdev->wiphy.dev); INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk); INIT_WORK(&rdev->propagate_radar_detect_wk, cfg80211_propagate_radar_detect_wk); INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); #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.max_num_csa_counters = 1; rdev->wiphy.max_sched_scan_plans = 1; rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; return &rdev->wiphy; } EXPORT_SYMBOL(wiphy_new_nm); 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 */ 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; /* Only a single NAN can be allowed */ if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) && c->limits[j].max > 1)) return -EINVAL; /* * This isn't well-defined right now. If you have an * IBSS interface, then its beacon interval may change * by joining other networks, and nothing prevents it * from doing that. * So technically we probably shouldn't even allow AP * and IBSS in the same interface, but it seems that * some drivers support that, possibly only with fixed * beacon intervals for IBSS. */ if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) && c->beacon_int_min_gcd)) { 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; } #ifndef CONFIG_WIRELESS_WDS if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS))) return -EINVAL; #endif /* 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_rdev(wiphy); int res; enum nl80211_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 && (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) return -EINVAL; if (WARN_ON(wiphy->wowlan && !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && !wiphy->wowlan->tcp)) return -EINVAL; #endif if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && (!rdev->ops->tdls_channel_switch || !rdev->ops->tdls_cancel_channel_switch))) return -EINVAL; if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) && (!rdev->ops->start_nan || !rdev->ops->stop_nan || !rdev->ops->add_nan_func || !rdev->ops->del_nan_func || !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ))))) return -EINVAL; #ifndef CONFIG_WIRELESS_WDS if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))) return -EINVAL; #endif /* * if a wiphy has unsupported modes for regulatory channel enforcement, * opt-out of enforcement checking */ if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_P2P_CLIENT) | BIT(NL80211_IFTYPE_AP) | BIT(NL80211_IFTYPE_P2P_GO) | BIT(NL80211_IFTYPE_ADHOC) | BIT(NL80211_IFTYPE_P2P_DEVICE) | BIT(NL80211_IFTYPE_NAN) | BIT(NL80211_IFTYPE_AP_VLAN) | BIT(NL80211_IFTYPE_MONITOR))) wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && (wiphy->regulatory_flags & (REGULATORY_CUSTOM_REG | REGULATORY_STRICT_REG | REGULATORY_COUNTRY_IE_FOLLOW_POWER | REGULATORY_COUNTRY_IE_IGNORE)))) return -EINVAL; if (WARN_ON(wiphy->coalesce && (!wiphy->coalesce->n_rules || !wiphy->coalesce->n_patterns) && (!wiphy->coalesce->pattern_min_len || wiphy->coalesce->pattern_min_len > wiphy->coalesce->pattern_max_len))) return -EINVAL; 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; /* assure only valid behaviours are flagged by driver * hence subtract 2 as bit 0 is invalid. */ if (WARN_ON(wiphy->bss_select_support && (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) return -EINVAL; if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy, NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) && (!rdev->ops->set_pmk || !rdev->ops->del_pmk))) return -EINVAL; if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) && rdev->ops->update_connect_params)) 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 < NUM_NL80211_BANDS; band++) { u16 types = 0; 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 != NL80211_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 == NL80211_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; } for (i = 0; i < sband->n_iftype_data; i++) { const struct ieee80211_sband_iftype_data *iftd; iftd = &sband->iftype_data[i]; if (WARN_ON(!iftd->types_mask)) return -EINVAL; if (WARN_ON(types & iftd->types_mask)) return -EINVAL; /* at least one piece of information must be present */ if (WARN_ON(!iftd->he_cap.has_he)) return -EINVAL; types |= iftd->types_mask; } have_band = true; } if (!have_band) { WARN_ON(1); return -EINVAL; } #ifdef CONFIG_PM if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns && (!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); rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH; rtnl_lock(); res = device_add(&rdev->wiphy.dev); if (res) { rtnl_unlock(); 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; cfg80211_debugfs_rdev_add(rdev); nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) { 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); } /* Check that nobody globally advertises any capabilities they do not * advertise on all possible interface types. */ if (wiphy->extended_capabilities_len && wiphy->num_iftype_ext_capab && wiphy->iftype_ext_capab) { u8 supported_on_all, j; const struct wiphy_iftype_ext_capab *capab; capab = wiphy->iftype_ext_capab; for (j = 0; j < wiphy->extended_capabilities_len; j++) { if (capab[0].extended_capabilities_len > j) supported_on_all = capab[0].extended_capabilities[j]; else supported_on_all = 0x00; for (i = 1; i < wiphy->num_iftype_ext_capab; i++) { if (j >= capab[i].extended_capabilities_len) { supported_on_all = 0x00; break; } supported_on_all &= capab[i].extended_capabilities[j]; } if (WARN_ON(wiphy->extended_capabilities[j] & ~supported_on_all)) break; } } rdev->wiphy.registered = true; rtnl_unlock(); res = rfkill_register(rdev->rfkill); if (res) { rfkill_destroy(rdev->rfkill); rdev->rfkill = NULL; wiphy_unregister(&rdev->wiphy); return res; } return 0; } EXPORT_SYMBOL(wiphy_register); void wiphy_rfkill_start_polling(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(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_rdev(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_rdev(wiphy); wait_event(rdev->dev_wait, ({ int __count; rtnl_lock(); __count = rdev->opencount; rtnl_unlock(); __count == 0; })); if (rdev->rfkill) rfkill_unregister(rdev->rfkill); rtnl_lock(); nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY); rdev->wiphy.registered = false; WARN_ON(!list_empty(&rdev->wiphy.wdev_list)); /* * 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(); /* * 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); rtnl_unlock(); 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); flush_work(&rdev->destroy_work); flush_work(&rdev->sched_scan_stop_wk); flush_work(&rdev->mlme_unreg_wk); flush_work(&rdev->propagate_radar_detect_wk); flush_work(&rdev->propagate_cac_done_wk); #ifdef CONFIG_PM if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) rdev_set_wakeup(rdev, false); #endif cfg80211_rdev_free_wowlan(rdev); cfg80211_rdev_free_coalesce(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); 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_rdev(wiphy); if (rfkill_set_hw_state(rdev->rfkill, blocked)) schedule_work(&rdev->rfkill_sync); } EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); void cfg80211_cqm_config_free(struct wireless_dev *wdev) { kfree(wdev->cqm_config); wdev->cqm_config = NULL; } void cfg80211_unregister_wdev(struct wireless_dev *wdev) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); ASSERT_RTNL(); if (WARN_ON(wdev->netdev)) return; nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); list_del_rcu(&wdev->list); rdev->devlist_generation++; switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: cfg80211_mlme_purge_registrations(wdev); cfg80211_stop_p2p_device(rdev, wdev); break; case NL80211_IFTYPE_NAN: cfg80211_stop_nan(rdev, wdev); break; default: WARN_ON_ONCE(1); break; } cfg80211_cqm_config_free(wdev); } EXPORT_SYMBOL(cfg80211_unregister_wdev); static const 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; struct cfg80211_sched_scan_request *pos, *tmp; ASSERT_RTNL(); ASSERT_WDEV_LOCK(wdev); switch (wdev->iftype) { case NL80211_IFTYPE_ADHOC: __cfg80211_leave_ibss(rdev, dev, true); break; case NL80211_IFTYPE_P2P_CLIENT: case NL80211_IFTYPE_STATION: list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, list) { if (dev == pos->dev) cfg80211_stop_sched_scan_req(rdev, pos, false); } #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); 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, true); break; case NL80211_IFTYPE_OCB: __cfg80211_leave_ocb(rdev, dev); break; case NL80211_IFTYPE_WDS: /* must be handled by mac80211/driver, has no APIs */ break; case NL80211_IFTYPE_P2P_DEVICE: case NL80211_IFTYPE_NAN: /* cannot happen, has no netdev */ break; case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_MONITOR: /* nothing to do */ break; case NL80211_IFTYPE_UNSPECIFIED: case NUM_NL80211_IFTYPES: /* invalid */ break; } } void cfg80211_leave(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { wdev_lock(wdev); __cfg80211_leave(rdev, wdev); wdev_unlock(wdev); } void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev, gfp_t gfp) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); struct cfg80211_event *ev; unsigned long flags; trace_cfg80211_stop_iface(wiphy, wdev); ev = kzalloc(sizeof(*ev), gfp); if (!ev) return; ev->type = EVENT_STOPPED; spin_lock_irqsave(&wdev->event_lock, flags); list_add_tail(&ev->list, &wdev->event_list); spin_unlock_irqrestore(&wdev->event_lock, flags); queue_work(cfg80211_wq, &rdev->event_work); } EXPORT_SYMBOL(cfg80211_stop_iface); static int cfg80211_netdev_notifier_call(struct notifier_block *nb, unsigned long state, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct wireless_dev *wdev = dev->ieee80211_ptr; struct cfg80211_registered_device *rdev; struct cfg80211_sched_scan_request *pos, *tmp; if (!wdev) return NOTIFY_DONE; rdev = wiphy_to_rdev(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_LIST_HEAD(&wdev->event_list); spin_lock_init(&wdev->event_lock); INIT_LIST_HEAD(&wdev->mgmt_registrations); spin_lock_init(&wdev->mgmt_registrations_lock); /* * We get here also when the interface changes network namespaces, * as it's registered into the new one, but we don't want it to * change ID in that case. Checking if the ID is already assigned * works, because 0 isn't considered a valid ID and the memory is * 0-initialized. */ if (!wdev->identifier) wdev->identifier = ++rdev->wdev_id; list_add_rcu(&wdev->list, &rdev->wiphy.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; #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; 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; INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk); nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE); break; case NETDEV_GOING_DOWN: cfg80211_leave(rdev, wdev); break; case NETDEV_DOWN: cfg80211_update_iface_num(rdev, wdev->iftype, -1); if (rdev->scan_req && rdev->scan_req->wdev == wdev) { if (WARN_ON(!rdev->scan_req->notified)) rdev->scan_req->info.aborted = true; ___cfg80211_scan_done(rdev, false); } list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list, list) { if (WARN_ON(pos && pos->dev == wdev->netdev)) cfg80211_stop_sched_scan_req(rdev, pos, false); } rdev->opencount--; wake_up(&rdev->dev_wait); break; case NETDEV_UP: cfg80211_update_iface_num(rdev, wdev->iftype, 1); 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); rdev->opencount++; /* * 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 && rdev_set_power_mgmt(rdev, dev, wdev->ps, wdev->ps_timeout)) { /* assume this means it's off */ wdev->ps = false; } break; case NETDEV_UNREGISTER: /* * 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)) { nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE); sysfs_remove_link(&dev->dev.kobj, "phy80211"); list_del_rcu(&wdev->list); rdev->devlist_generation++; cfg80211_mlme_purge_registrations(wdev); #ifdef CONFIG_CFG80211_WEXT kzfree(wdev->wext.keys); #endif flush_work(&wdev->disconnect_wk); cfg80211_cqm_config_free(wdev); } /* * 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); if (WARN_ON(wdev->current_bss)) { cfg80211_unhold_bss(wdev->current_bss); cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); wdev->current_bss = NULL; } 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); break; default: return NOTIFY_DONE; } wireless_nlevent_flush(); return NOTIFY_OK; } 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(); 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)); } 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 = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM); if (!cfg80211_wq) { err = -ENOMEM; goto out_fail_wq; } return 0; out_fail_wq: regulatory_exit(); out_fail_reg: debugfs_remove(ieee80211_debugfs_dir); nl80211_exit(); 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; } fs_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);