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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * This is the linux wireless configuration interface.
0004  *
0005  * Copyright 2006-2010      Johannes Berg <johannes@sipsolutions.net>
0006  * Copyright 2013-2014  Intel Mobile Communications GmbH
0007  * Copyright 2015-2017  Intel Deutschland GmbH
0008  * Copyright (C) 2018-2022 Intel Corporation
0009  */
0010 
0011 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0012 
0013 #include <linux/if.h>
0014 #include <linux/module.h>
0015 #include <linux/err.h>
0016 #include <linux/list.h>
0017 #include <linux/slab.h>
0018 #include <linux/nl80211.h>
0019 #include <linux/debugfs.h>
0020 #include <linux/notifier.h>
0021 #include <linux/device.h>
0022 #include <linux/etherdevice.h>
0023 #include <linux/rtnetlink.h>
0024 #include <linux/sched.h>
0025 #include <net/genetlink.h>
0026 #include <net/cfg80211.h>
0027 #include "nl80211.h"
0028 #include "core.h"
0029 #include "sysfs.h"
0030 #include "debugfs.h"
0031 #include "wext-compat.h"
0032 #include "rdev-ops.h"
0033 
0034 /* name for sysfs, %d is appended */
0035 #define PHY_NAME "phy"
0036 
0037 MODULE_AUTHOR("Johannes Berg");
0038 MODULE_LICENSE("GPL");
0039 MODULE_DESCRIPTION("wireless configuration support");
0040 MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
0041 
0042 /* RCU-protected (and RTNL for writers) */
0043 LIST_HEAD(cfg80211_rdev_list);
0044 int cfg80211_rdev_list_generation;
0045 
0046 /* for debugfs */
0047 static struct dentry *ieee80211_debugfs_dir;
0048 
0049 /* for the cleanup, scan and event works */
0050 struct workqueue_struct *cfg80211_wq;
0051 
0052 static bool cfg80211_disable_40mhz_24ghz;
0053 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
0054 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
0055          "Disable 40MHz support in the 2.4GHz band");
0056 
0057 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
0058 {
0059     struct cfg80211_registered_device *result = NULL, *rdev;
0060 
0061     ASSERT_RTNL();
0062 
0063     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
0064         if (rdev->wiphy_idx == wiphy_idx) {
0065             result = rdev;
0066             break;
0067         }
0068     }
0069 
0070     return result;
0071 }
0072 
0073 int get_wiphy_idx(struct wiphy *wiphy)
0074 {
0075     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
0076 
0077     return rdev->wiphy_idx;
0078 }
0079 
0080 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
0081 {
0082     struct cfg80211_registered_device *rdev;
0083 
0084     ASSERT_RTNL();
0085 
0086     rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
0087     if (!rdev)
0088         return NULL;
0089     return &rdev->wiphy;
0090 }
0091 
0092 static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
0093                    const char *newname)
0094 {
0095     struct cfg80211_registered_device *rdev2;
0096     int wiphy_idx, taken = -1, digits;
0097 
0098     ASSERT_RTNL();
0099 
0100     if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
0101         return -EINVAL;
0102 
0103     /* prohibit calling the thing phy%d when %d is not its number */
0104     sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
0105     if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
0106         /* count number of places needed to print wiphy_idx */
0107         digits = 1;
0108         while (wiphy_idx /= 10)
0109             digits++;
0110         /*
0111          * deny the name if it is phy<idx> where <idx> is printed
0112          * without leading zeroes. taken == strlen(newname) here
0113          */
0114         if (taken == strlen(PHY_NAME) + digits)
0115             return -EINVAL;
0116     }
0117 
0118     /* Ensure another device does not already have this name. */
0119     list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
0120         if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
0121             return -EINVAL;
0122 
0123     return 0;
0124 }
0125 
0126 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
0127             char *newname)
0128 {
0129     int result;
0130 
0131     ASSERT_RTNL();
0132 
0133     /* Ignore nop renames */
0134     if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
0135         return 0;
0136 
0137     result = cfg80211_dev_check_name(rdev, newname);
0138     if (result < 0)
0139         return result;
0140 
0141     result = device_rename(&rdev->wiphy.dev, newname);
0142     if (result)
0143         return result;
0144 
0145     if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
0146         debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
0147                    rdev->wiphy.debugfsdir,
0148                    rdev->wiphy.debugfsdir->d_parent, newname);
0149 
0150     nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
0151 
0152     return 0;
0153 }
0154 
0155 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
0156               struct net *net)
0157 {
0158     struct wireless_dev *wdev;
0159     int err = 0;
0160 
0161     if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
0162         return -EOPNOTSUPP;
0163 
0164     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
0165         if (!wdev->netdev)
0166             continue;
0167         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
0168         err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
0169         if (err)
0170             break;
0171         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
0172     }
0173 
0174     if (err) {
0175         /* failed -- clean up to old netns */
0176         net = wiphy_net(&rdev->wiphy);
0177 
0178         list_for_each_entry_continue_reverse(wdev,
0179                              &rdev->wiphy.wdev_list,
0180                              list) {
0181             if (!wdev->netdev)
0182                 continue;
0183             wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
0184             err = dev_change_net_namespace(wdev->netdev, net,
0185                             "wlan%d");
0186             WARN_ON(err);
0187             wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
0188         }
0189 
0190         return err;
0191     }
0192 
0193     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
0194         if (!wdev->netdev)
0195             continue;
0196         nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
0197     }
0198     nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
0199 
0200     wiphy_net_set(&rdev->wiphy, net);
0201 
0202     err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
0203     WARN_ON(err);
0204 
0205     nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
0206     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
0207         if (!wdev->netdev)
0208             continue;
0209         nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
0210     }
0211 
0212     return 0;
0213 }
0214 
0215 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
0216 {
0217     struct cfg80211_registered_device *rdev = data;
0218 
0219     rdev_rfkill_poll(rdev);
0220 }
0221 
0222 void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
0223                   struct wireless_dev *wdev)
0224 {
0225     lockdep_assert_held(&rdev->wiphy.mtx);
0226 
0227     if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
0228         return;
0229 
0230     if (!wdev_running(wdev))
0231         return;
0232 
0233     rdev_stop_p2p_device(rdev, wdev);
0234     wdev->is_running = false;
0235 
0236     rdev->opencount--;
0237 
0238     if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
0239         if (WARN_ON(!rdev->scan_req->notified &&
0240                 (!rdev->int_scan_req ||
0241                  !rdev->int_scan_req->notified)))
0242             rdev->scan_req->info.aborted = true;
0243         ___cfg80211_scan_done(rdev, false);
0244     }
0245 }
0246 
0247 void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
0248                struct wireless_dev *wdev)
0249 {
0250     lockdep_assert_held(&rdev->wiphy.mtx);
0251 
0252     if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
0253         return;
0254 
0255     if (!wdev_running(wdev))
0256         return;
0257 
0258     rdev_stop_nan(rdev, wdev);
0259     wdev->is_running = false;
0260 
0261     rdev->opencount--;
0262 }
0263 
0264 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
0265 {
0266     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
0267     struct wireless_dev *wdev;
0268 
0269     ASSERT_RTNL();
0270 
0271     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
0272         if (wdev->netdev) {
0273             dev_close(wdev->netdev);
0274             continue;
0275         }
0276 
0277         /* otherwise, check iftype */
0278 
0279         wiphy_lock(wiphy);
0280 
0281         switch (wdev->iftype) {
0282         case NL80211_IFTYPE_P2P_DEVICE:
0283             cfg80211_stop_p2p_device(rdev, wdev);
0284             break;
0285         case NL80211_IFTYPE_NAN:
0286             cfg80211_stop_nan(rdev, wdev);
0287             break;
0288         default:
0289             break;
0290         }
0291 
0292         wiphy_unlock(wiphy);
0293     }
0294 }
0295 EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
0296 
0297 static int cfg80211_rfkill_set_block(void *data, bool blocked)
0298 {
0299     struct cfg80211_registered_device *rdev = data;
0300 
0301     if (!blocked)
0302         return 0;
0303 
0304     rtnl_lock();
0305     cfg80211_shutdown_all_interfaces(&rdev->wiphy);
0306     rtnl_unlock();
0307 
0308     return 0;
0309 }
0310 
0311 static void cfg80211_rfkill_block_work(struct work_struct *work)
0312 {
0313     struct cfg80211_registered_device *rdev;
0314 
0315     rdev = container_of(work, struct cfg80211_registered_device,
0316                 rfkill_block);
0317     cfg80211_rfkill_set_block(rdev, true);
0318 }
0319 
0320 static void cfg80211_event_work(struct work_struct *work)
0321 {
0322     struct cfg80211_registered_device *rdev;
0323 
0324     rdev = container_of(work, struct cfg80211_registered_device,
0325                 event_work);
0326 
0327     wiphy_lock(&rdev->wiphy);
0328     cfg80211_process_rdev_events(rdev);
0329     wiphy_unlock(&rdev->wiphy);
0330 }
0331 
0332 void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
0333 {
0334     struct wireless_dev *wdev, *tmp;
0335 
0336     ASSERT_RTNL();
0337 
0338     list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
0339         if (wdev->nl_owner_dead) {
0340             if (wdev->netdev)
0341                 dev_close(wdev->netdev);
0342 
0343             wiphy_lock(&rdev->wiphy);
0344             cfg80211_leave(rdev, wdev);
0345             cfg80211_remove_virtual_intf(rdev, wdev);
0346             wiphy_unlock(&rdev->wiphy);
0347         }
0348     }
0349 }
0350 
0351 static void cfg80211_destroy_iface_wk(struct work_struct *work)
0352 {
0353     struct cfg80211_registered_device *rdev;
0354 
0355     rdev = container_of(work, struct cfg80211_registered_device,
0356                 destroy_work);
0357 
0358     rtnl_lock();
0359     cfg80211_destroy_ifaces(rdev);
0360     rtnl_unlock();
0361 }
0362 
0363 static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
0364 {
0365     struct cfg80211_registered_device *rdev;
0366     struct cfg80211_sched_scan_request *req, *tmp;
0367 
0368     rdev = container_of(work, struct cfg80211_registered_device,
0369                sched_scan_stop_wk);
0370 
0371     rtnl_lock();
0372     list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
0373         if (req->nl_owner_dead)
0374             cfg80211_stop_sched_scan_req(rdev, req, false);
0375     }
0376     rtnl_unlock();
0377 }
0378 
0379 static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
0380 {
0381     struct cfg80211_registered_device *rdev;
0382 
0383     rdev = container_of(work, struct cfg80211_registered_device,
0384                 propagate_radar_detect_wk);
0385 
0386     rtnl_lock();
0387 
0388     regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
0389                        NL80211_DFS_UNAVAILABLE,
0390                        NL80211_RADAR_DETECTED);
0391 
0392     rtnl_unlock();
0393 }
0394 
0395 static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
0396 {
0397     struct cfg80211_registered_device *rdev;
0398 
0399     rdev = container_of(work, struct cfg80211_registered_device,
0400                 propagate_cac_done_wk);
0401 
0402     rtnl_lock();
0403 
0404     regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
0405                        NL80211_DFS_AVAILABLE,
0406                        NL80211_RADAR_CAC_FINISHED);
0407 
0408     rtnl_unlock();
0409 }
0410 
0411 /* exported functions */
0412 
0413 struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
0414                const char *requested_name)
0415 {
0416     static atomic_t wiphy_counter = ATOMIC_INIT(0);
0417 
0418     struct cfg80211_registered_device *rdev;
0419     int alloc_size;
0420 
0421     WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
0422     WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
0423     WARN_ON(ops->connect && !ops->disconnect);
0424     WARN_ON(ops->join_ibss && !ops->leave_ibss);
0425     WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
0426     WARN_ON(ops->add_station && !ops->del_station);
0427     WARN_ON(ops->add_mpath && !ops->del_mpath);
0428     WARN_ON(ops->join_mesh && !ops->leave_mesh);
0429     WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
0430     WARN_ON(ops->start_ap && !ops->stop_ap);
0431     WARN_ON(ops->join_ocb && !ops->leave_ocb);
0432     WARN_ON(ops->suspend && !ops->resume);
0433     WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
0434     WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
0435     WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
0436     WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
0437 
0438     alloc_size = sizeof(*rdev) + sizeof_priv;
0439 
0440     rdev = kzalloc(alloc_size, GFP_KERNEL);
0441     if (!rdev)
0442         return NULL;
0443 
0444     rdev->ops = ops;
0445 
0446     rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
0447 
0448     if (unlikely(rdev->wiphy_idx < 0)) {
0449         /* ugh, wrapped! */
0450         atomic_dec(&wiphy_counter);
0451         kfree(rdev);
0452         return NULL;
0453     }
0454 
0455     /* atomic_inc_return makes it start at 1, make it start at 0 */
0456     rdev->wiphy_idx--;
0457 
0458     /* give it a proper name */
0459     if (requested_name && requested_name[0]) {
0460         int rv;
0461 
0462         rtnl_lock();
0463         rv = cfg80211_dev_check_name(rdev, requested_name);
0464 
0465         if (rv < 0) {
0466             rtnl_unlock();
0467             goto use_default_name;
0468         }
0469 
0470         rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
0471         rtnl_unlock();
0472         if (rv)
0473             goto use_default_name;
0474     } else {
0475         int rv;
0476 
0477 use_default_name:
0478         /* NOTE:  This is *probably* safe w/out holding rtnl because of
0479          * the restrictions on phy names.  Probably this call could
0480          * fail if some other part of the kernel (re)named a device
0481          * phyX.  But, might should add some locking and check return
0482          * value, and use a different name if this one exists?
0483          */
0484         rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
0485         if (rv < 0) {
0486             kfree(rdev);
0487             return NULL;
0488         }
0489     }
0490 
0491     mutex_init(&rdev->wiphy.mtx);
0492     INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
0493     INIT_LIST_HEAD(&rdev->beacon_registrations);
0494     spin_lock_init(&rdev->beacon_registrations_lock);
0495     spin_lock_init(&rdev->bss_lock);
0496     INIT_LIST_HEAD(&rdev->bss_list);
0497     INIT_LIST_HEAD(&rdev->sched_scan_req_list);
0498     INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
0499     INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
0500               cfg80211_dfs_channels_update_work);
0501 #ifdef CONFIG_CFG80211_WEXT
0502     rdev->wiphy.wext = &cfg80211_wext_handler;
0503 #endif
0504 
0505     device_initialize(&rdev->wiphy.dev);
0506     rdev->wiphy.dev.class = &ieee80211_class;
0507     rdev->wiphy.dev.platform_data = rdev;
0508     device_enable_async_suspend(&rdev->wiphy.dev);
0509 
0510     INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
0511     INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
0512     INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
0513     INIT_WORK(&rdev->propagate_radar_detect_wk,
0514           cfg80211_propagate_radar_detect_wk);
0515     INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
0516     INIT_WORK(&rdev->mgmt_registrations_update_wk,
0517           cfg80211_mgmt_registrations_update_wk);
0518     spin_lock_init(&rdev->mgmt_registrations_lock);
0519 
0520 #ifdef CONFIG_CFG80211_DEFAULT_PS
0521     rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
0522 #endif
0523 
0524     wiphy_net_set(&rdev->wiphy, &init_net);
0525 
0526     rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
0527     rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
0528                       &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
0529                       &rdev->rfkill_ops, rdev);
0530 
0531     if (!rdev->wiphy.rfkill) {
0532         wiphy_free(&rdev->wiphy);
0533         return NULL;
0534     }
0535 
0536     INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
0537     INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
0538     INIT_WORK(&rdev->event_work, cfg80211_event_work);
0539     INIT_WORK(&rdev->background_cac_abort_wk,
0540           cfg80211_background_cac_abort_wk);
0541     INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
0542               cfg80211_background_cac_done_wk);
0543 
0544     init_waitqueue_head(&rdev->dev_wait);
0545 
0546     /*
0547      * Initialize wiphy parameters to IEEE 802.11 MIB default values.
0548      * Fragmentation and RTS threshold are disabled by default with the
0549      * special -1 value.
0550      */
0551     rdev->wiphy.retry_short = 7;
0552     rdev->wiphy.retry_long = 4;
0553     rdev->wiphy.frag_threshold = (u32) -1;
0554     rdev->wiphy.rts_threshold = (u32) -1;
0555     rdev->wiphy.coverage_class = 0;
0556 
0557     rdev->wiphy.max_num_csa_counters = 1;
0558 
0559     rdev->wiphy.max_sched_scan_plans = 1;
0560     rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
0561 
0562     return &rdev->wiphy;
0563 }
0564 EXPORT_SYMBOL(wiphy_new_nm);
0565 
0566 static int wiphy_verify_combinations(struct wiphy *wiphy)
0567 {
0568     const struct ieee80211_iface_combination *c;
0569     int i, j;
0570 
0571     for (i = 0; i < wiphy->n_iface_combinations; i++) {
0572         u32 cnt = 0;
0573         u16 all_iftypes = 0;
0574 
0575         c = &wiphy->iface_combinations[i];
0576 
0577         /*
0578          * Combinations with just one interface aren't real,
0579          * however we make an exception for DFS.
0580          */
0581         if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
0582             return -EINVAL;
0583 
0584         /* Need at least one channel */
0585         if (WARN_ON(!c->num_different_channels))
0586             return -EINVAL;
0587 
0588         /* DFS only works on one channel. */
0589         if (WARN_ON(c->radar_detect_widths &&
0590                 (c->num_different_channels > 1)))
0591             return -EINVAL;
0592 
0593         if (WARN_ON(!c->n_limits))
0594             return -EINVAL;
0595 
0596         for (j = 0; j < c->n_limits; j++) {
0597             u16 types = c->limits[j].types;
0598 
0599             /* interface types shouldn't overlap */
0600             if (WARN_ON(types & all_iftypes))
0601                 return -EINVAL;
0602             all_iftypes |= types;
0603 
0604             if (WARN_ON(!c->limits[j].max))
0605                 return -EINVAL;
0606 
0607             /* Shouldn't list software iftypes in combinations! */
0608             if (WARN_ON(wiphy->software_iftypes & types))
0609                 return -EINVAL;
0610 
0611             /* Only a single P2P_DEVICE can be allowed */
0612             if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
0613                     c->limits[j].max > 1))
0614                 return -EINVAL;
0615 
0616             /* Only a single NAN can be allowed */
0617             if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
0618                     c->limits[j].max > 1))
0619                 return -EINVAL;
0620 
0621             /*
0622              * This isn't well-defined right now. If you have an
0623              * IBSS interface, then its beacon interval may change
0624              * by joining other networks, and nothing prevents it
0625              * from doing that.
0626              * So technically we probably shouldn't even allow AP
0627              * and IBSS in the same interface, but it seems that
0628              * some drivers support that, possibly only with fixed
0629              * beacon intervals for IBSS.
0630              */
0631             if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
0632                     c->beacon_int_min_gcd)) {
0633                 return -EINVAL;
0634             }
0635 
0636             cnt += c->limits[j].max;
0637             /*
0638              * Don't advertise an unsupported type
0639              * in a combination.
0640              */
0641             if (WARN_ON((wiphy->interface_modes & types) != types))
0642                 return -EINVAL;
0643         }
0644 
0645         if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
0646             return -EINVAL;
0647 
0648         /* You can't even choose that many! */
0649         if (WARN_ON(cnt < c->max_interfaces))
0650             return -EINVAL;
0651     }
0652 
0653     return 0;
0654 }
0655 
0656 int wiphy_register(struct wiphy *wiphy)
0657 {
0658     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
0659     int res;
0660     enum nl80211_band band;
0661     struct ieee80211_supported_band *sband;
0662     bool have_band = false;
0663     int i;
0664     u16 ifmodes = wiphy->interface_modes;
0665 
0666 #ifdef CONFIG_PM
0667     if (WARN_ON(wiphy->wowlan &&
0668             (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
0669             !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
0670         return -EINVAL;
0671     if (WARN_ON(wiphy->wowlan &&
0672             !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
0673             !wiphy->wowlan->tcp))
0674         return -EINVAL;
0675 #endif
0676     if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
0677             (!rdev->ops->tdls_channel_switch ||
0678              !rdev->ops->tdls_cancel_channel_switch)))
0679         return -EINVAL;
0680 
0681     if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
0682             (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
0683              !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
0684              !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
0685         return -EINVAL;
0686 
0687     if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
0688         return -EINVAL;
0689 
0690     if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
0691         return -EINVAL;
0692 
0693     if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
0694         if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
0695                 !wiphy->pmsr_capa->ftm.non_asap))
0696             return -EINVAL;
0697         if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
0698                 !wiphy->pmsr_capa->ftm.bandwidths))
0699             return -EINVAL;
0700         if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
0701                 ~(BIT(NL80211_PREAMBLE_LEGACY) |
0702                   BIT(NL80211_PREAMBLE_HT) |
0703                   BIT(NL80211_PREAMBLE_VHT) |
0704                   BIT(NL80211_PREAMBLE_HE) |
0705                   BIT(NL80211_PREAMBLE_DMG))))
0706             return -EINVAL;
0707         if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
0708                  wiphy->pmsr_capa->ftm.non_trigger_based) &&
0709                 !(wiphy->pmsr_capa->ftm.preambles &
0710                   BIT(NL80211_PREAMBLE_HE))))
0711             return -EINVAL;
0712         if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
0713                 ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
0714                   BIT(NL80211_CHAN_WIDTH_20) |
0715                   BIT(NL80211_CHAN_WIDTH_40) |
0716                   BIT(NL80211_CHAN_WIDTH_80) |
0717                   BIT(NL80211_CHAN_WIDTH_80P80) |
0718                   BIT(NL80211_CHAN_WIDTH_160) |
0719                   BIT(NL80211_CHAN_WIDTH_5) |
0720                   BIT(NL80211_CHAN_WIDTH_10))))
0721             return -EINVAL;
0722     }
0723 
0724     /*
0725      * if a wiphy has unsupported modes for regulatory channel enforcement,
0726      * opt-out of enforcement checking
0727      */
0728     if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
0729                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
0730                        BIT(NL80211_IFTYPE_AP) |
0731                        BIT(NL80211_IFTYPE_MESH_POINT) |
0732                        BIT(NL80211_IFTYPE_P2P_GO) |
0733                        BIT(NL80211_IFTYPE_ADHOC) |
0734                        BIT(NL80211_IFTYPE_P2P_DEVICE) |
0735                        BIT(NL80211_IFTYPE_NAN) |
0736                        BIT(NL80211_IFTYPE_AP_VLAN) |
0737                        BIT(NL80211_IFTYPE_MONITOR)))
0738         wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
0739 
0740     if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
0741             (wiphy->regulatory_flags &
0742                     (REGULATORY_CUSTOM_REG |
0743                      REGULATORY_STRICT_REG |
0744                      REGULATORY_COUNTRY_IE_FOLLOW_POWER |
0745                      REGULATORY_COUNTRY_IE_IGNORE))))
0746         return -EINVAL;
0747 
0748     if (WARN_ON(wiphy->coalesce &&
0749             (!wiphy->coalesce->n_rules ||
0750              !wiphy->coalesce->n_patterns) &&
0751             (!wiphy->coalesce->pattern_min_len ||
0752              wiphy->coalesce->pattern_min_len >
0753             wiphy->coalesce->pattern_max_len)))
0754         return -EINVAL;
0755 
0756     if (WARN_ON(wiphy->ap_sme_capa &&
0757             !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
0758         return -EINVAL;
0759 
0760     if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
0761         return -EINVAL;
0762 
0763     if (WARN_ON(wiphy->addresses &&
0764             !is_zero_ether_addr(wiphy->perm_addr) &&
0765             memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
0766                ETH_ALEN)))
0767         return -EINVAL;
0768 
0769     if (WARN_ON(wiphy->max_acl_mac_addrs &&
0770             (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
0771              !rdev->ops->set_mac_acl)))
0772         return -EINVAL;
0773 
0774     /* assure only valid behaviours are flagged by driver
0775      * hence subtract 2 as bit 0 is invalid.
0776      */
0777     if (WARN_ON(wiphy->bss_select_support &&
0778             (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
0779         return -EINVAL;
0780 
0781     if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
0782                         NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
0783             (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
0784         return -EINVAL;
0785 
0786     if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
0787             rdev->ops->update_connect_params))
0788         return -EINVAL;
0789 
0790     if (wiphy->addresses)
0791         memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
0792 
0793     /* sanity check ifmodes */
0794     WARN_ON(!ifmodes);
0795     ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
0796     if (WARN_ON(ifmodes != wiphy->interface_modes))
0797         wiphy->interface_modes = ifmodes;
0798 
0799     res = wiphy_verify_combinations(wiphy);
0800     if (res)
0801         return res;
0802 
0803     /* sanity check supported bands/channels */
0804     for (band = 0; band < NUM_NL80211_BANDS; band++) {
0805         u16 types = 0;
0806         bool have_he = false;
0807 
0808         sband = wiphy->bands[band];
0809         if (!sband)
0810             continue;
0811 
0812         sband->band = band;
0813         if (WARN_ON(!sband->n_channels))
0814             return -EINVAL;
0815         /*
0816          * on 60GHz or sub-1Ghz band, there are no legacy rates, so
0817          * n_bitrates is 0
0818          */
0819         if (WARN_ON((band != NL80211_BAND_60GHZ &&
0820                  band != NL80211_BAND_S1GHZ) &&
0821                 !sband->n_bitrates))
0822             return -EINVAL;
0823 
0824         if (WARN_ON(band == NL80211_BAND_6GHZ &&
0825                 (sband->ht_cap.ht_supported ||
0826                  sband->vht_cap.vht_supported)))
0827             return -EINVAL;
0828 
0829         /*
0830          * Since cfg80211_disable_40mhz_24ghz is global, we can
0831          * modify the sband's ht data even if the driver uses a
0832          * global structure for that.
0833          */
0834         if (cfg80211_disable_40mhz_24ghz &&
0835             band == NL80211_BAND_2GHZ &&
0836             sband->ht_cap.ht_supported) {
0837             sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
0838             sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
0839         }
0840 
0841         /*
0842          * Since we use a u32 for rate bitmaps in
0843          * ieee80211_get_response_rate, we cannot
0844          * have more than 32 legacy rates.
0845          */
0846         if (WARN_ON(sband->n_bitrates > 32))
0847             return -EINVAL;
0848 
0849         for (i = 0; i < sband->n_channels; i++) {
0850             sband->channels[i].orig_flags =
0851                 sband->channels[i].flags;
0852             sband->channels[i].orig_mag = INT_MAX;
0853             sband->channels[i].orig_mpwr =
0854                 sband->channels[i].max_power;
0855             sband->channels[i].band = band;
0856 
0857             if (WARN_ON(sband->channels[i].freq_offset >= 1000))
0858                 return -EINVAL;
0859         }
0860 
0861         for (i = 0; i < sband->n_iftype_data; i++) {
0862             const struct ieee80211_sband_iftype_data *iftd;
0863 
0864             iftd = &sband->iftype_data[i];
0865 
0866             if (WARN_ON(!iftd->types_mask))
0867                 return -EINVAL;
0868             if (WARN_ON(types & iftd->types_mask))
0869                 return -EINVAL;
0870 
0871             /* at least one piece of information must be present */
0872             if (WARN_ON(!iftd->he_cap.has_he))
0873                 return -EINVAL;
0874 
0875             types |= iftd->types_mask;
0876 
0877             if (i == 0)
0878                 have_he = iftd->he_cap.has_he;
0879             else
0880                 have_he = have_he &&
0881                       iftd->he_cap.has_he;
0882         }
0883 
0884         if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
0885             return -EINVAL;
0886 
0887         have_band = true;
0888     }
0889 
0890     if (!have_band) {
0891         WARN_ON(1);
0892         return -EINVAL;
0893     }
0894 
0895     for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
0896         /*
0897          * Validate we have a policy (can be explicitly set to
0898          * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
0899          * we have at least one of doit/dumpit.
0900          */
0901         if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
0902             return -EINVAL;
0903         if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
0904                 !rdev->wiphy.vendor_commands[i].dumpit))
0905             return -EINVAL;
0906     }
0907 
0908 #ifdef CONFIG_PM
0909     if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
0910             (!rdev->wiphy.wowlan->pattern_min_len ||
0911              rdev->wiphy.wowlan->pattern_min_len >
0912                 rdev->wiphy.wowlan->pattern_max_len)))
0913         return -EINVAL;
0914 #endif
0915 
0916     if (!wiphy->max_num_akm_suites)
0917         wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
0918     else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
0919          wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
0920         return -EINVAL;
0921 
0922     /* check and set up bitrates */
0923     ieee80211_set_bitrate_flags(wiphy);
0924 
0925     rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
0926 
0927     rtnl_lock();
0928     res = device_add(&rdev->wiphy.dev);
0929     if (res) {
0930         rtnl_unlock();
0931         return res;
0932     }
0933 
0934     list_add_rcu(&rdev->list, &cfg80211_rdev_list);
0935     cfg80211_rdev_list_generation++;
0936 
0937     /* add to debugfs */
0938     rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
0939                             ieee80211_debugfs_dir);
0940 
0941     cfg80211_debugfs_rdev_add(rdev);
0942     nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
0943 
0944     /* set up regulatory info */
0945     wiphy_regulatory_register(wiphy);
0946 
0947     if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
0948         struct regulatory_request request;
0949 
0950         request.wiphy_idx = get_wiphy_idx(wiphy);
0951         request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
0952         request.alpha2[0] = '9';
0953         request.alpha2[1] = '9';
0954 
0955         nl80211_send_reg_change_event(&request);
0956     }
0957 
0958     /* Check that nobody globally advertises any capabilities they do not
0959      * advertise on all possible interface types.
0960      */
0961     if (wiphy->extended_capabilities_len &&
0962         wiphy->num_iftype_ext_capab &&
0963         wiphy->iftype_ext_capab) {
0964         u8 supported_on_all, j;
0965         const struct wiphy_iftype_ext_capab *capab;
0966 
0967         capab = wiphy->iftype_ext_capab;
0968         for (j = 0; j < wiphy->extended_capabilities_len; j++) {
0969             if (capab[0].extended_capabilities_len > j)
0970                 supported_on_all =
0971                     capab[0].extended_capabilities[j];
0972             else
0973                 supported_on_all = 0x00;
0974             for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
0975                 if (j >= capab[i].extended_capabilities_len) {
0976                     supported_on_all = 0x00;
0977                     break;
0978                 }
0979                 supported_on_all &=
0980                     capab[i].extended_capabilities[j];
0981             }
0982             if (WARN_ON(wiphy->extended_capabilities[j] &
0983                     ~supported_on_all))
0984                 break;
0985         }
0986     }
0987 
0988     rdev->wiphy.registered = true;
0989     rtnl_unlock();
0990 
0991     res = rfkill_register(rdev->wiphy.rfkill);
0992     if (res) {
0993         rfkill_destroy(rdev->wiphy.rfkill);
0994         rdev->wiphy.rfkill = NULL;
0995         wiphy_unregister(&rdev->wiphy);
0996         return res;
0997     }
0998 
0999     return 0;
1000 }
1001 EXPORT_SYMBOL(wiphy_register);
1002 
1003 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1004 {
1005     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1006 
1007     if (!rdev->ops->rfkill_poll)
1008         return;
1009     rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1010     rfkill_resume_polling(wiphy->rfkill);
1011 }
1012 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1013 
1014 void wiphy_unregister(struct wiphy *wiphy)
1015 {
1016     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1017 
1018     wait_event(rdev->dev_wait, ({
1019         int __count;
1020         wiphy_lock(&rdev->wiphy);
1021         __count = rdev->opencount;
1022         wiphy_unlock(&rdev->wiphy);
1023         __count == 0; }));
1024 
1025     if (rdev->wiphy.rfkill)
1026         rfkill_unregister(rdev->wiphy.rfkill);
1027 
1028     rtnl_lock();
1029     wiphy_lock(&rdev->wiphy);
1030     nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1031     rdev->wiphy.registered = false;
1032 
1033     WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1034 
1035     /*
1036      * First remove the hardware from everywhere, this makes
1037      * it impossible to find from userspace.
1038      */
1039     debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1040     list_del_rcu(&rdev->list);
1041     synchronize_rcu();
1042 
1043     /*
1044      * If this device got a regulatory hint tell core its
1045      * free to listen now to a new shiny device regulatory hint
1046      */
1047     wiphy_regulatory_deregister(wiphy);
1048 
1049     cfg80211_rdev_list_generation++;
1050     device_del(&rdev->wiphy.dev);
1051 
1052     wiphy_unlock(&rdev->wiphy);
1053     rtnl_unlock();
1054 
1055     flush_work(&rdev->scan_done_wk);
1056     cancel_work_sync(&rdev->conn_work);
1057     flush_work(&rdev->event_work);
1058     cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1059     cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1060     flush_work(&rdev->destroy_work);
1061     flush_work(&rdev->sched_scan_stop_wk);
1062     flush_work(&rdev->propagate_radar_detect_wk);
1063     flush_work(&rdev->propagate_cac_done_wk);
1064     flush_work(&rdev->mgmt_registrations_update_wk);
1065     flush_work(&rdev->background_cac_abort_wk);
1066 
1067 #ifdef CONFIG_PM
1068     if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1069         rdev_set_wakeup(rdev, false);
1070 #endif
1071     cfg80211_rdev_free_wowlan(rdev);
1072     cfg80211_rdev_free_coalesce(rdev);
1073 }
1074 EXPORT_SYMBOL(wiphy_unregister);
1075 
1076 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1077 {
1078     struct cfg80211_internal_bss *scan, *tmp;
1079     struct cfg80211_beacon_registration *reg, *treg;
1080     rfkill_destroy(rdev->wiphy.rfkill);
1081     list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1082         list_del(&reg->list);
1083         kfree(reg);
1084     }
1085     list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1086         cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1087     mutex_destroy(&rdev->wiphy.mtx);
1088 
1089     /*
1090      * The 'regd' can only be non-NULL if we never finished
1091      * initializing the wiphy and thus never went through the
1092      * unregister path - e.g. in failure scenarios. Thus, it
1093      * cannot have been visible to anyone if non-NULL, so we
1094      * can just free it here.
1095      */
1096     kfree(rcu_dereference_raw(rdev->wiphy.regd));
1097 
1098     kfree(rdev);
1099 }
1100 
1101 void wiphy_free(struct wiphy *wiphy)
1102 {
1103     put_device(&wiphy->dev);
1104 }
1105 EXPORT_SYMBOL(wiphy_free);
1106 
1107 void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1108                       enum rfkill_hard_block_reasons reason)
1109 {
1110     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1111 
1112     if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1113         schedule_work(&rdev->rfkill_block);
1114 }
1115 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1116 
1117 void cfg80211_cqm_config_free(struct wireless_dev *wdev)
1118 {
1119     kfree(wdev->cqm_config);
1120     wdev->cqm_config = NULL;
1121 }
1122 
1123 static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1124                       bool unregister_netdev)
1125 {
1126     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1127     unsigned int link_id;
1128 
1129     ASSERT_RTNL();
1130     lockdep_assert_held(&rdev->wiphy.mtx);
1131 
1132     flush_work(&wdev->pmsr_free_wk);
1133 
1134     nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1135 
1136     wdev->registered = false;
1137 
1138     if (wdev->netdev) {
1139         sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1140         if (unregister_netdev)
1141             unregister_netdevice(wdev->netdev);
1142     }
1143 
1144     list_del_rcu(&wdev->list);
1145     synchronize_net();
1146     rdev->devlist_generation++;
1147 
1148     cfg80211_mlme_purge_registrations(wdev);
1149 
1150     switch (wdev->iftype) {
1151     case NL80211_IFTYPE_P2P_DEVICE:
1152         cfg80211_stop_p2p_device(rdev, wdev);
1153         break;
1154     case NL80211_IFTYPE_NAN:
1155         cfg80211_stop_nan(rdev, wdev);
1156         break;
1157     default:
1158         break;
1159     }
1160 
1161 #ifdef CONFIG_CFG80211_WEXT
1162     kfree_sensitive(wdev->wext.keys);
1163     wdev->wext.keys = NULL;
1164 #endif
1165     /* only initialized if we have a netdev */
1166     if (wdev->netdev)
1167         flush_work(&wdev->disconnect_wk);
1168 
1169     cfg80211_cqm_config_free(wdev);
1170 
1171     /*
1172      * Ensure that all events have been processed and
1173      * freed.
1174      */
1175     cfg80211_process_wdev_events(wdev);
1176 
1177     if (wdev->iftype == NL80211_IFTYPE_STATION ||
1178         wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1179         for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1180             struct cfg80211_internal_bss *curbss;
1181 
1182             curbss = wdev->links[link_id].client.current_bss;
1183 
1184             if (WARN_ON(curbss)) {
1185                 cfg80211_unhold_bss(curbss);
1186                 cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1187                 wdev->links[link_id].client.current_bss = NULL;
1188             }
1189         }
1190     }
1191 
1192     wdev->connected = false;
1193 }
1194 
1195 void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1196 {
1197     _cfg80211_unregister_wdev(wdev, true);
1198 }
1199 EXPORT_SYMBOL(cfg80211_unregister_wdev);
1200 
1201 static const struct device_type wiphy_type = {
1202     .name   = "wlan",
1203 };
1204 
1205 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1206                    enum nl80211_iftype iftype, int num)
1207 {
1208     lockdep_assert_held(&rdev->wiphy.mtx);
1209 
1210     rdev->num_running_ifaces += num;
1211     if (iftype == NL80211_IFTYPE_MONITOR)
1212         rdev->num_running_monitor_ifaces += num;
1213 }
1214 
1215 void __cfg80211_leave(struct cfg80211_registered_device *rdev,
1216               struct wireless_dev *wdev)
1217 {
1218     struct net_device *dev = wdev->netdev;
1219     struct cfg80211_sched_scan_request *pos, *tmp;
1220 
1221     lockdep_assert_held(&rdev->wiphy.mtx);
1222     ASSERT_WDEV_LOCK(wdev);
1223 
1224     cfg80211_pmsr_wdev_down(wdev);
1225 
1226     cfg80211_stop_background_radar_detection(wdev);
1227 
1228     switch (wdev->iftype) {
1229     case NL80211_IFTYPE_ADHOC:
1230         __cfg80211_leave_ibss(rdev, dev, true);
1231         break;
1232     case NL80211_IFTYPE_P2P_CLIENT:
1233     case NL80211_IFTYPE_STATION:
1234         list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1235                      list) {
1236             if (dev == pos->dev)
1237                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1238         }
1239 
1240 #ifdef CONFIG_CFG80211_WEXT
1241         kfree(wdev->wext.ie);
1242         wdev->wext.ie = NULL;
1243         wdev->wext.ie_len = 0;
1244         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1245 #endif
1246         cfg80211_disconnect(rdev, dev,
1247                     WLAN_REASON_DEAUTH_LEAVING, true);
1248         break;
1249     case NL80211_IFTYPE_MESH_POINT:
1250         __cfg80211_leave_mesh(rdev, dev);
1251         break;
1252     case NL80211_IFTYPE_AP:
1253     case NL80211_IFTYPE_P2P_GO:
1254         __cfg80211_stop_ap(rdev, dev, -1, true);
1255         break;
1256     case NL80211_IFTYPE_OCB:
1257         __cfg80211_leave_ocb(rdev, dev);
1258         break;
1259     case NL80211_IFTYPE_P2P_DEVICE:
1260     case NL80211_IFTYPE_NAN:
1261         /* cannot happen, has no netdev */
1262         break;
1263     case NL80211_IFTYPE_AP_VLAN:
1264     case NL80211_IFTYPE_MONITOR:
1265         /* nothing to do */
1266         break;
1267     case NL80211_IFTYPE_UNSPECIFIED:
1268     case NL80211_IFTYPE_WDS:
1269     case NUM_NL80211_IFTYPES:
1270         /* invalid */
1271         break;
1272     }
1273 }
1274 
1275 void cfg80211_leave(struct cfg80211_registered_device *rdev,
1276             struct wireless_dev *wdev)
1277 {
1278     wdev_lock(wdev);
1279     __cfg80211_leave(rdev, wdev);
1280     wdev_unlock(wdev);
1281 }
1282 
1283 void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1284              gfp_t gfp)
1285 {
1286     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1287     struct cfg80211_event *ev;
1288     unsigned long flags;
1289 
1290     trace_cfg80211_stop_iface(wiphy, wdev);
1291 
1292     ev = kzalloc(sizeof(*ev), gfp);
1293     if (!ev)
1294         return;
1295 
1296     ev->type = EVENT_STOPPED;
1297 
1298     spin_lock_irqsave(&wdev->event_lock, flags);
1299     list_add_tail(&ev->list, &wdev->event_list);
1300     spin_unlock_irqrestore(&wdev->event_lock, flags);
1301     queue_work(cfg80211_wq, &rdev->event_work);
1302 }
1303 EXPORT_SYMBOL(cfg80211_stop_iface);
1304 
1305 void cfg80211_init_wdev(struct wireless_dev *wdev)
1306 {
1307     mutex_init(&wdev->mtx);
1308     INIT_LIST_HEAD(&wdev->event_list);
1309     spin_lock_init(&wdev->event_lock);
1310     INIT_LIST_HEAD(&wdev->mgmt_registrations);
1311     INIT_LIST_HEAD(&wdev->pmsr_list);
1312     spin_lock_init(&wdev->pmsr_lock);
1313     INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1314 
1315 #ifdef CONFIG_CFG80211_WEXT
1316     wdev->wext.default_key = -1;
1317     wdev->wext.default_mgmt_key = -1;
1318     wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1319 #endif
1320 
1321     if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1322         wdev->ps = true;
1323     else
1324         wdev->ps = false;
1325     /* allow mac80211 to determine the timeout */
1326     wdev->ps_timeout = -1;
1327 
1328     if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1329          wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1330          wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1331         wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1332 
1333     INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1334 }
1335 
1336 void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1337                 struct wireless_dev *wdev)
1338 {
1339     ASSERT_RTNL();
1340     lockdep_assert_held(&rdev->wiphy.mtx);
1341 
1342     /*
1343      * We get here also when the interface changes network namespaces,
1344      * as it's registered into the new one, but we don't want it to
1345      * change ID in that case. Checking if the ID is already assigned
1346      * works, because 0 isn't considered a valid ID and the memory is
1347      * 0-initialized.
1348      */
1349     if (!wdev->identifier)
1350         wdev->identifier = ++rdev->wdev_id;
1351     list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1352     rdev->devlist_generation++;
1353     wdev->registered = true;
1354 
1355     if (wdev->netdev &&
1356         sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1357                   "phy80211"))
1358         pr_err("failed to add phy80211 symlink to netdev!\n");
1359 
1360     nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1361 }
1362 
1363 int cfg80211_register_netdevice(struct net_device *dev)
1364 {
1365     struct wireless_dev *wdev = dev->ieee80211_ptr;
1366     struct cfg80211_registered_device *rdev;
1367     int ret;
1368 
1369     ASSERT_RTNL();
1370 
1371     if (WARN_ON(!wdev))
1372         return -EINVAL;
1373 
1374     rdev = wiphy_to_rdev(wdev->wiphy);
1375 
1376     lockdep_assert_held(&rdev->wiphy.mtx);
1377 
1378     /* we'll take care of this */
1379     wdev->registered = true;
1380     wdev->registering = true;
1381     ret = register_netdevice(dev);
1382     if (ret)
1383         goto out;
1384 
1385     cfg80211_register_wdev(rdev, wdev);
1386     ret = 0;
1387 out:
1388     wdev->registering = false;
1389     if (ret)
1390         wdev->registered = false;
1391     return ret;
1392 }
1393 EXPORT_SYMBOL(cfg80211_register_netdevice);
1394 
1395 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1396                      unsigned long state, void *ptr)
1397 {
1398     struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1399     struct wireless_dev *wdev = dev->ieee80211_ptr;
1400     struct cfg80211_registered_device *rdev;
1401     struct cfg80211_sched_scan_request *pos, *tmp;
1402 
1403     if (!wdev)
1404         return NOTIFY_DONE;
1405 
1406     rdev = wiphy_to_rdev(wdev->wiphy);
1407 
1408     WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1409 
1410     switch (state) {
1411     case NETDEV_POST_INIT:
1412         SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1413         wdev->netdev = dev;
1414         /* can only change netns with wiphy */
1415         dev->features |= NETIF_F_NETNS_LOCAL;
1416 
1417         cfg80211_init_wdev(wdev);
1418         break;
1419     case NETDEV_REGISTER:
1420         if (!wdev->registered) {
1421             wiphy_lock(&rdev->wiphy);
1422             cfg80211_register_wdev(rdev, wdev);
1423             wiphy_unlock(&rdev->wiphy);
1424         }
1425         break;
1426     case NETDEV_UNREGISTER:
1427         /*
1428          * It is possible to get NETDEV_UNREGISTER multiple times,
1429          * so check wdev->registered.
1430          */
1431         if (wdev->registered && !wdev->registering) {
1432             wiphy_lock(&rdev->wiphy);
1433             _cfg80211_unregister_wdev(wdev, false);
1434             wiphy_unlock(&rdev->wiphy);
1435         }
1436         break;
1437     case NETDEV_GOING_DOWN:
1438         wiphy_lock(&rdev->wiphy);
1439         cfg80211_leave(rdev, wdev);
1440         cfg80211_remove_links(wdev);
1441         wiphy_unlock(&rdev->wiphy);
1442         break;
1443     case NETDEV_DOWN:
1444         wiphy_lock(&rdev->wiphy);
1445         cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1446         if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1447             if (WARN_ON(!rdev->scan_req->notified &&
1448                     (!rdev->int_scan_req ||
1449                      !rdev->int_scan_req->notified)))
1450                 rdev->scan_req->info.aborted = true;
1451             ___cfg80211_scan_done(rdev, false);
1452         }
1453 
1454         list_for_each_entry_safe(pos, tmp,
1455                      &rdev->sched_scan_req_list, list) {
1456             if (WARN_ON(pos->dev == wdev->netdev))
1457                 cfg80211_stop_sched_scan_req(rdev, pos, false);
1458         }
1459 
1460         rdev->opencount--;
1461         wiphy_unlock(&rdev->wiphy);
1462         wake_up(&rdev->dev_wait);
1463         break;
1464     case NETDEV_UP:
1465         wiphy_lock(&rdev->wiphy);
1466         cfg80211_update_iface_num(rdev, wdev->iftype, 1);
1467         wdev_lock(wdev);
1468         switch (wdev->iftype) {
1469 #ifdef CONFIG_CFG80211_WEXT
1470         case NL80211_IFTYPE_ADHOC:
1471             cfg80211_ibss_wext_join(rdev, wdev);
1472             break;
1473         case NL80211_IFTYPE_STATION:
1474             cfg80211_mgd_wext_connect(rdev, wdev);
1475             break;
1476 #endif
1477 #ifdef CONFIG_MAC80211_MESH
1478         case NL80211_IFTYPE_MESH_POINT:
1479             {
1480                 /* backward compat code... */
1481                 struct mesh_setup setup;
1482                 memcpy(&setup, &default_mesh_setup,
1483                         sizeof(setup));
1484                  /* back compat only needed for mesh_id */
1485                 setup.mesh_id = wdev->u.mesh.id;
1486                 setup.mesh_id_len = wdev->u.mesh.id_up_len;
1487                 if (wdev->u.mesh.id_up_len)
1488                     __cfg80211_join_mesh(rdev, dev,
1489                             &setup,
1490                             &default_mesh_config);
1491                 break;
1492             }
1493 #endif
1494         default:
1495             break;
1496         }
1497         wdev_unlock(wdev);
1498         rdev->opencount++;
1499 
1500         /*
1501          * Configure power management to the driver here so that its
1502          * correctly set also after interface type changes etc.
1503          */
1504         if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1505              wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1506             rdev->ops->set_power_mgmt &&
1507             rdev_set_power_mgmt(rdev, dev, wdev->ps,
1508                     wdev->ps_timeout)) {
1509             /* assume this means it's off */
1510             wdev->ps = false;
1511         }
1512         wiphy_unlock(&rdev->wiphy);
1513         break;
1514     case NETDEV_PRE_UP:
1515         if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1516                          wdev->use_4addr, 0))
1517             return notifier_from_errno(-EOPNOTSUPP);
1518 
1519         if (rfkill_blocked(rdev->wiphy.rfkill))
1520             return notifier_from_errno(-ERFKILL);
1521         break;
1522     default:
1523         return NOTIFY_DONE;
1524     }
1525 
1526     wireless_nlevent_flush();
1527 
1528     return NOTIFY_OK;
1529 }
1530 
1531 static struct notifier_block cfg80211_netdev_notifier = {
1532     .notifier_call = cfg80211_netdev_notifier_call,
1533 };
1534 
1535 static void __net_exit cfg80211_pernet_exit(struct net *net)
1536 {
1537     struct cfg80211_registered_device *rdev;
1538 
1539     rtnl_lock();
1540     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
1541         if (net_eq(wiphy_net(&rdev->wiphy), net))
1542             WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1543     }
1544     rtnl_unlock();
1545 }
1546 
1547 static struct pernet_operations cfg80211_pernet_ops = {
1548     .exit = cfg80211_pernet_exit,
1549 };
1550 
1551 static int __init cfg80211_init(void)
1552 {
1553     int err;
1554 
1555     err = register_pernet_device(&cfg80211_pernet_ops);
1556     if (err)
1557         goto out_fail_pernet;
1558 
1559     err = wiphy_sysfs_init();
1560     if (err)
1561         goto out_fail_sysfs;
1562 
1563     err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1564     if (err)
1565         goto out_fail_notifier;
1566 
1567     err = nl80211_init();
1568     if (err)
1569         goto out_fail_nl80211;
1570 
1571     ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1572 
1573     err = regulatory_init();
1574     if (err)
1575         goto out_fail_reg;
1576 
1577     cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1578     if (!cfg80211_wq) {
1579         err = -ENOMEM;
1580         goto out_fail_wq;
1581     }
1582 
1583     return 0;
1584 
1585 out_fail_wq:
1586     regulatory_exit();
1587 out_fail_reg:
1588     debugfs_remove(ieee80211_debugfs_dir);
1589     nl80211_exit();
1590 out_fail_nl80211:
1591     unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1592 out_fail_notifier:
1593     wiphy_sysfs_exit();
1594 out_fail_sysfs:
1595     unregister_pernet_device(&cfg80211_pernet_ops);
1596 out_fail_pernet:
1597     return err;
1598 }
1599 fs_initcall(cfg80211_init);
1600 
1601 static void __exit cfg80211_exit(void)
1602 {
1603     debugfs_remove(ieee80211_debugfs_dir);
1604     nl80211_exit();
1605     unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1606     wiphy_sysfs_exit();
1607     regulatory_exit();
1608     unregister_pernet_device(&cfg80211_pernet_ops);
1609     destroy_workqueue(cfg80211_wq);
1610 }
1611 module_exit(cfg80211_exit);
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