net/wireless/mlme.c

   1 /*
   2  * cfg80211 MLME SAP interface
   3  *
   4  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/slab.h>
  13 #include <linux/wireless.h>
  14 #include <net/cfg80211.h>
  15 #include <net/iw_handler.h>
  16 #include "core.h"
  17 #include "nl80211.h"
  18 #include "rdev-ops.h"
  19
  20
  21 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
  22                             const u8 *buf, size_t len)
  23 {
  24         struct wireless_dev *wdev = dev->ieee80211_ptr;
  25         struct wiphy *wiphy = wdev->wiphy;
  26         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
  27         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  28         u8 *ie = mgmt->u.assoc_resp.variable;
  29         int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
  30         u16 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
  31
  32         trace_cfg80211_send_rx_assoc(dev, bss);
  33
  34         /*
  35          * This is a bit of a hack, we don't notify userspace of
  36          * a (re-)association reply if we tried to send a reassoc
  37          * and got a reject -- we only try again with an assoc
  38          * frame instead of reassoc.
  39          */
  40         if (cfg80211_sme_rx_assoc_resp(wdev, status_code)) {
  41                 cfg80211_unhold_bss(bss_from_pub(bss));
  42                 cfg80211_put_bss(wiphy, bss);
  43                 return;
  44         }
  45
  46         nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL);
  47         /* update current_bss etc., consumes the bss reference */
  48         __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
  49                                   status_code,
  50                                   status_code == WLAN_STATUS_SUCCESS, bss);
  51 }
  52 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
  53
  54 static void cfg80211_process_auth(struct wireless_dev *wdev,
  55                                   const u8 *buf, size_t len)
  56 {
  57         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  58
  59         nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  60         cfg80211_sme_rx_auth(wdev, buf, len);
  61 }
  62
  63 static void cfg80211_process_deauth(struct wireless_dev *wdev,
  64                                     const u8 *buf, size_t len)
  65 {
  66         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  67         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  68         const u8 *bssid = mgmt->bssid;
  69         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
  70         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
  71
  72         nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  73
  74         if (!wdev->current_bss ||
  75             !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
  76                 return;
  77
  78         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
  79         cfg80211_sme_deauth(wdev);
  80 }
  81
  82 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
  83                                       const u8 *buf, size_t len)
  84 {
  85         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  86         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  87         const u8 *bssid = mgmt->bssid;
  88         u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
  89         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
  90
  91         nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  92
  93         if (WARN_ON(!wdev->current_bss ||
  94                     !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
  95                 return;
  96
  97         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
  98         cfg80211_sme_disassoc(wdev);
  99 }
 100
 101 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 102 {
 103         struct wireless_dev *wdev = dev->ieee80211_ptr;
 104         struct ieee80211_mgmt *mgmt = (void *)buf;
 105
 106         ASSERT_WDEV_LOCK(wdev);
 107
 108         trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
 109
 110         if (WARN_ON(len < 2))
 111                 return;
 112
 113         if (ieee80211_is_auth(mgmt->frame_control))
 114                 cfg80211_process_auth(wdev, buf, len);
 115         else if (ieee80211_is_deauth(mgmt->frame_control))
 116                 cfg80211_process_deauth(wdev, buf, len);
 117         else if (ieee80211_is_disassoc(mgmt->frame_control))
 118                 cfg80211_process_disassoc(wdev, buf, len);
 119 }
 120 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
 121
 122 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
 123 {
 124         struct wireless_dev *wdev = dev->ieee80211_ptr;
 125         struct wiphy *wiphy = wdev->wiphy;
 126         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 127
 128         trace_cfg80211_send_auth_timeout(dev, addr);
 129
 130         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 131         cfg80211_sme_auth_timeout(wdev);
 132 }
 133 EXPORT_SYMBOL(cfg80211_auth_timeout);
 134
 135 void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
 136 {
 137         struct wireless_dev *wdev = dev->ieee80211_ptr;
 138         struct wiphy *wiphy = wdev->wiphy;
 139         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 140
 141         trace_cfg80211_send_assoc_timeout(dev, bss->bssid);
 142
 143         nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
 144         cfg80211_sme_assoc_timeout(wdev);
 145
 146         cfg80211_unhold_bss(bss_from_pub(bss));
 147         cfg80211_put_bss(wiphy, bss);
 148 }
 149 EXPORT_SYMBOL(cfg80211_assoc_timeout);
 150
 151 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 152 {
 153         struct wireless_dev *wdev = dev->ieee80211_ptr;
 154         struct ieee80211_mgmt *mgmt = (void *)buf;
 155
 156         ASSERT_WDEV_LOCK(wdev);
 157
 158         trace_cfg80211_tx_mlme_mgmt(dev, buf, len);
 159
 160         if (WARN_ON(len < 2))
 161                 return;
 162
 163         if (ieee80211_is_deauth(mgmt->frame_control))
 164                 cfg80211_process_deauth(wdev, buf, len);
 165         else
 166                 cfg80211_process_disassoc(wdev, buf, len);
 167 }
 168 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 169
 170 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 171                                   enum nl80211_key_type key_type, int key_id,
 172                                   const u8 *tsc, gfp_t gfp)
 173 {
 174         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 175         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 176 #ifdef CONFIG_CFG80211_WEXT
 177         union iwreq_data wrqu;
 178         char *buf = kmalloc(128, gfp);
 179
 180         if (buf) {
 181                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 182                         "keyid=%d %scast addr=%pM)", key_id,
 183                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 184                         addr);
 185                 memset(&wrqu, 0, sizeof(wrqu));
 186                 wrqu.data.length = strlen(buf);
 187                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 188                 kfree(buf);
 189         }
 190 #endif
 191
 192         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 193         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 194 }
 195 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 196
 197 /* some MLME handling for userspace SME */
 198 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 199                        struct net_device *dev,
 200                        struct ieee80211_channel *chan,
 201                        enum nl80211_auth_type auth_type,
 202                        const u8 *bssid,
 203                        const u8 *ssid, int ssid_len,
 204                        const u8 *ie, int ie_len,
 205                        const u8 *key, int key_len, int key_idx,
 206                        const u8 *sae_data, int sae_data_len)
 207 {
 208         struct wireless_dev *wdev = dev->ieee80211_ptr;
 209         struct cfg80211_auth_request req = {
 210                 .ie = ie,
 211                 .ie_len = ie_len,
 212                 .sae_data = sae_data,
 213                 .sae_data_len = sae_data_len,
 214                 .auth_type = auth_type,
 215                 .key = key,
 216                 .key_len = key_len,
 217                 .key_idx = key_idx,
 218         };
 219         int err;
 220
 221         ASSERT_WDEV_LOCK(wdev);
 222
 223         if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
 224                 if (!key || !key_len || key_idx < 0 || key_idx > 4)
 225                         return -EINVAL;
 226
 227         if (wdev->current_bss &&
 228             ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
 229                 return -EALREADY;
 230
 231         req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 232                                    WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 233         if (!req.bss)
 234                 return -ENOENT;
 235
 236         err = cfg80211_can_use_chan(rdev, wdev, req.bss->channel,
 237                                     CHAN_MODE_SHARED);
 238         if (err)
 239                 goto out;
 240
 241         err = rdev_auth(rdev, dev, &req);
 242
 243 out:
 244         cfg80211_put_bss(&rdev->wiphy, req.bss);
 245         return err;
 246 }
 247
 248 /*  Do a logical ht_capa &= ht_capa_mask.  */
 249 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 250                                const struct ieee80211_ht_cap *ht_capa_mask)
 251 {
 252         int i;
 253         u8 *p1, *p2;
 254         if (!ht_capa_mask) {
 255                 memset(ht_capa, 0, sizeof(*ht_capa));
 256                 return;
 257         }
 258
 259         p1 = (u8*)(ht_capa);
 260         p2 = (u8*)(ht_capa_mask);
 261         for (i = 0; i<sizeof(*ht_capa); i++)
 262                 p1[i] &= p2[i];
 263 }
 264
 265 /*  Do a logical ht_capa &= ht_capa_mask.  */
 266 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 267                                 const struct ieee80211_vht_cap *vht_capa_mask)
 268 {
 269         int i;
 270         u8 *p1, *p2;
 271         if (!vht_capa_mask) {
 272                 memset(vht_capa, 0, sizeof(*vht_capa));
 273                 return;
 274         }
 275
 276         p1 = (u8*)(vht_capa);
 277         p2 = (u8*)(vht_capa_mask);
 278         for (i = 0; i < sizeof(*vht_capa); i++)
 279                 p1[i] &= p2[i];
 280 }
 281
 282 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 283                         struct net_device *dev,
 284                         struct ieee80211_channel *chan,
 285                         const u8 *bssid,
 286                         const u8 *ssid, int ssid_len,
 287                         struct cfg80211_assoc_request *req)
 288 {
 289         struct wireless_dev *wdev = dev->ieee80211_ptr;
 290         int err;
 291
 292         ASSERT_WDEV_LOCK(wdev);
 293
 294         if (wdev->current_bss &&
 295             (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
 296                                                    req->prev_bssid)))
 297                 return -EALREADY;
 298
 299         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 300                                   rdev->wiphy.ht_capa_mod_mask);
 301         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 302                                    rdev->wiphy.vht_capa_mod_mask);
 303
 304         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 305                                     WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 306         if (!req->bss)
 307                 return -ENOENT;
 308
 309         err = cfg80211_can_use_chan(rdev, wdev, chan, CHAN_MODE_SHARED);
 310         if (err)
 311                 goto out;
 312
 313         err = rdev_assoc(rdev, dev, req);
 314         if (!err)
 315                 cfg80211_hold_bss(bss_from_pub(req->bss));
 316
 317 out:
 318         if (err)
 319                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 320
 321         return err;
 322 }
 323
 324 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 325                          struct net_device *dev, const u8 *bssid,
 326                          const u8 *ie, int ie_len, u16 reason,
 327                          bool local_state_change)
 328 {
 329         struct wireless_dev *wdev = dev->ieee80211_ptr;
 330         struct cfg80211_deauth_request req = {
 331                 .bssid = bssid,
 332                 .reason_code = reason,
 333                 .ie = ie,
 334                 .ie_len = ie_len,
 335                 .local_state_change = local_state_change,
 336         };
 337
 338         ASSERT_WDEV_LOCK(wdev);
 339
 340         if (local_state_change &&
 341             (!wdev->current_bss ||
 342              !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 343                 return 0;
 344
 345         return rdev_deauth(rdev, dev, &req);
 346 }
 347
 348 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 349                            struct net_device *dev, const u8 *bssid,
 350                            const u8 *ie, int ie_len, u16 reason,
 351                            bool local_state_change)
 352 {
 353         struct wireless_dev *wdev = dev->ieee80211_ptr;
 354         struct cfg80211_disassoc_request req = {
 355                 .reason_code = reason,
 356                 .local_state_change = local_state_change,
 357                 .ie = ie,
 358                 .ie_len = ie_len,
 359         };
 360         int err;
 361
 362         ASSERT_WDEV_LOCK(wdev);
 363
 364         if (!wdev->current_bss)
 365                 return -ENOTCONN;
 366
 367         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 368                 req.bss = &wdev->current_bss->pub;
 369         else
 370                 return -ENOTCONN;
 371
 372         err = rdev_disassoc(rdev, dev, &req);
 373         if (err)
 374                 return err;
 375
 376         /* driver should have reported the disassoc */
 377         WARN_ON(wdev->current_bss);
 378         return 0;
 379 }
 380
 381 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 382                         struct net_device *dev)
 383 {
 384         struct wireless_dev *wdev = dev->ieee80211_ptr;
 385         u8 bssid[ETH_ALEN];
 386
 387         ASSERT_WDEV_LOCK(wdev);
 388
 389         if (!rdev->ops->deauth)
 390                 return;
 391
 392         if (!wdev->current_bss)
 393                 return;
 394
 395         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 396         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 397                              WLAN_REASON_DEAUTH_LEAVING, false);
 398 }
 399
 400 struct cfg80211_mgmt_registration {
 401         struct list_head list;
 402
 403         u32 nlportid;
 404
 405         int match_len;
 406
 407         __le16 frame_type;
 408
 409         u8 match[];
 410 };
 411
 412 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 413                                 u16 frame_type, const u8 *match_data,
 414                                 int match_len)
 415 {
 416         struct wiphy *wiphy = wdev->wiphy;
 417         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 418         struct cfg80211_mgmt_registration *reg, *nreg;
 419         int err = 0;
 420         u16 mgmt_type;
 421
 422         if (!wdev->wiphy->mgmt_stypes)
 423                 return -EOPNOTSUPP;
 424
 425         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
 426                 return -EINVAL;
 427
 428         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 429                 return -EINVAL;
 430
 431         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 432         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
 433                 return -EINVAL;
 434
 435         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 436         if (!nreg)
 437                 return -ENOMEM;
 438
 439         spin_lock_bh(&wdev->mgmt_registrations_lock);
 440
 441         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 442                 int mlen = min(match_len, reg->match_len);
 443
 444                 if (frame_type != le16_to_cpu(reg->frame_type))
 445                         continue;
 446
 447                 if (memcmp(reg->match, match_data, mlen) == 0) {
 448                         err = -EALREADY;
 449                         break;
 450                 }
 451         }
 452
 453         if (err) {
 454                 kfree(nreg);
 455                 goto out;
 456         }
 457
 458         memcpy(nreg->match, match_data, match_len);
 459         nreg->match_len = match_len;
 460         nreg->nlportid = snd_portid;
 461         nreg->frame_type = cpu_to_le16(frame_type);
 462         list_add(&nreg->list, &wdev->mgmt_registrations);
 463
 464         if (rdev->ops->mgmt_frame_register)
 465                 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
 466
 467  out:
 468         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 469
 470         return err;
 471 }
 472
 473 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 474 {
 475         struct wiphy *wiphy = wdev->wiphy;
 476         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 477         struct cfg80211_mgmt_registration *reg, *tmp;
 478
 479         spin_lock_bh(&wdev->mgmt_registrations_lock);
 480
 481         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 482                 if (reg->nlportid != nlportid)
 483                         continue;
 484
 485                 if (rdev->ops->mgmt_frame_register) {
 486                         u16 frame_type = le16_to_cpu(reg->frame_type);
 487
 488                         rdev_mgmt_frame_register(rdev, wdev,
 489                                                  frame_type, false);
 490                 }
 491
 492                 list_del(&reg->list);
 493                 kfree(reg);
 494         }
 495
 496         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 497
 498         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 499                 rdev->crit_proto_nlportid = 0;
 500                 rdev_crit_proto_stop(rdev, wdev);
 501         }
 502
 503         if (nlportid == wdev->ap_unexpected_nlportid)
 504                 wdev->ap_unexpected_nlportid = 0;
 505 }
 506
 507 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 508 {
 509         struct cfg80211_mgmt_registration *reg, *tmp;
 510
 511         spin_lock_bh(&wdev->mgmt_registrations_lock);
 512
 513         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 514                 list_del(&reg->list);
 515                 kfree(reg);
 516         }
 517
 518         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 519 }
 520
 521 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 522                           struct wireless_dev *wdev,
 523                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 524 {
 525         const struct ieee80211_mgmt *mgmt;
 526         u16 stype;
 527
 528         if (!wdev->wiphy->mgmt_stypes)
 529                 return -EOPNOTSUPP;
 530
 531         if (!rdev->ops->mgmt_tx)
 532                 return -EOPNOTSUPP;
 533
 534         if (params->len < 24 + 1)
 535                 return -EINVAL;
 536
 537         mgmt = (const struct ieee80211_mgmt *)params->buf;
 538
 539         if (!ieee80211_is_mgmt(mgmt->frame_control))
 540                 return -EINVAL;
 541
 542         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 543         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 544                 return -EINVAL;
 545
 546         if (ieee80211_is_action(mgmt->frame_control) &&
 547             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 548                 int err = 0;
 549
 550                 wdev_lock(wdev);
 551
 552                 switch (wdev->iftype) {
 553                 case NL80211_IFTYPE_ADHOC:
 554                 case NL80211_IFTYPE_STATION:
 555                 case NL80211_IFTYPE_P2P_CLIENT:
 556                         if (!wdev->current_bss) {
 557                                 err = -ENOTCONN;
 558                                 break;
 559                         }
 560
 561                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 562                                               mgmt->bssid)) {
 563                                 err = -ENOTCONN;
 564                                 break;
 565                         }
 566
 567                         /*
 568                          * check for IBSS DA must be done by driver as
 569                          * cfg80211 doesn't track the stations
 570                          */
 571                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 572                                 break;
 573
 574                         /* for station, check that DA is the AP */
 575                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 576                                               mgmt->da)) {
 577                                 err = -ENOTCONN;
 578                                 break;
 579                         }
 580                         break;
 581                 case NL80211_IFTYPE_AP:
 582                 case NL80211_IFTYPE_P2P_GO:
 583                 case NL80211_IFTYPE_AP_VLAN:
 584                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 585                                 err = -EINVAL;
 586                         break;
 587                 case NL80211_IFTYPE_MESH_POINT:
 588                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 589                                 err = -EINVAL;
 590                                 break;
 591                         }
 592                         /*
 593                          * check for mesh DA must be done by driver as
 594                          * cfg80211 doesn't track the stations
 595                          */
 596                         break;
 597                 case NL80211_IFTYPE_P2P_DEVICE:
 598                         /*
 599                          * fall through, P2P device only supports
 600                          * public action frames
 601                          */
 602                 default:
 603                         err = -EOPNOTSUPP;
 604                         break;
 605                 }
 606                 wdev_unlock(wdev);
 607
 608                 if (err)
 609                         return err;
 610         }
 611
 612         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
 613                 return -EINVAL;
 614
 615         /* Transmit the Action frame as requested by user space */
 616         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 617 }
 618
 619 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 620                       const u8 *buf, size_t len, u32 flags, gfp_t gfp)
 621 {
 622         struct wiphy *wiphy = wdev->wiphy;
 623         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 624         struct cfg80211_mgmt_registration *reg;
 625         const struct ieee80211_txrx_stypes *stypes =
 626                 &wiphy->mgmt_stypes[wdev->iftype];
 627         struct ieee80211_mgmt *mgmt = (void *)buf;
 628         const u8 *data;
 629         int data_len;
 630         bool result = false;
 631         __le16 ftype = mgmt->frame_control &
 632                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 633         u16 stype;
 634
 635         trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
 636         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 637
 638         if (!(stypes->rx & BIT(stype))) {
 639                 trace_cfg80211_return_bool(false);
 640                 return false;
 641         }
 642
 643         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 644         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 645
 646         spin_lock_bh(&wdev->mgmt_registrations_lock);
 647
 648         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 649                 if (reg->frame_type != ftype)
 650                         continue;
 651
 652                 if (reg->match_len > data_len)
 653                         continue;
 654
 655                 if (memcmp(reg->match, data, reg->match_len))
 656                         continue;
 657
 658                 /* found match! */
 659
 660                 /* Indicate the received Action frame to user space */
 661                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 662                                       freq, sig_mbm,
 663                                       buf, len, flags, gfp))
 664                         continue;
 665
 666                 result = true;
 667                 break;
 668         }
 669
 670         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 671
 672         trace_cfg80211_return_bool(result);
 673         return result;
 674 }
 675 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 676
 677 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 678 {
 679         struct delayed_work *delayed_work;
 680         struct cfg80211_registered_device *rdev;
 681         struct cfg80211_chan_def chandef;
 682         struct ieee80211_supported_band *sband;
 683         struct ieee80211_channel *c;
 684         struct wiphy *wiphy;
 685         bool check_again = false;
 686         unsigned long timeout, next_time = 0;
 687         int bandid, i;
 688
 689         delayed_work = container_of(work, struct delayed_work, work);
 690         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 691                             dfs_update_channels_wk);
 692         wiphy = &rdev->wiphy;
 693
 694         rtnl_lock();
 695         for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
 696                 sband = wiphy->bands[bandid];
 697                 if (!sband)
 698                         continue;
 699
 700                 for (i = 0; i < sband->n_channels; i++) {
 701                         c = &sband->channels[i];
 702
 703                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
 704                                 continue;
 705
 706                         timeout = c->dfs_state_entered + msecs_to_jiffies(
 707                                         IEEE80211_DFS_MIN_NOP_TIME_MS);
 708
 709                         if (time_after_eq(jiffies, timeout)) {
 710                                 c->dfs_state = NL80211_DFS_USABLE;
 711                                 c->dfs_state_entered = jiffies;
 712
 713                                 cfg80211_chandef_create(&chandef, c,
 714                                                         NL80211_CHAN_NO_HT);
 715
 716                                 nl80211_radar_notify(rdev, &chandef,
 717                                                      NL80211_RADAR_NOP_FINISHED,
 718                                                      NULL, GFP_ATOMIC);
 719                                 continue;
 720                         }
 721
 722                         if (!check_again)
 723                                 next_time = timeout - jiffies;
 724                         else
 725                                 next_time = min(next_time, timeout - jiffies);
 726                         check_again = true;
 727                 }
 728         }
 729         rtnl_unlock();
 730
 731         /* reschedule if there are other channels waiting to be cleared again */
 732         if (check_again)
 733                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 734                                    next_time);
 735 }
 736
 737
 738 void cfg80211_radar_event(struct wiphy *wiphy,
 739                           struct cfg80211_chan_def *chandef,
 740                           gfp_t gfp)
 741 {
 742         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 743         unsigned long timeout;
 744
 745         trace_cfg80211_radar_event(wiphy, chandef);
 746
 747         /* only set the chandef supplied channel to unavailable, in
 748          * case the radar is detected on only one of multiple channels
 749          * spanned by the chandef.
 750          */
 751         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 752
 753         timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
 754         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 755                            timeout);
 756
 757         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 758 }
 759 EXPORT_SYMBOL(cfg80211_radar_event);
 760
 761 void cfg80211_cac_event(struct net_device *netdev,
 762                         const struct cfg80211_chan_def *chandef,
 763                         enum nl80211_radar_event event, gfp_t gfp)
 764 {
 765         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 766         struct wiphy *wiphy = wdev->wiphy;
 767         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 768         unsigned long timeout;
 769
 770         trace_cfg80211_cac_event(netdev, event);
 771
 772         if (WARN_ON(!wdev->cac_started))
 773                 return;
 774
 775         if (WARN_ON(!wdev->chandef.chan))
 776                 return;
 777
 778         switch (event) {
 779         case NL80211_RADAR_CAC_FINISHED:
 780                 timeout = wdev->cac_start_time +
 781                           msecs_to_jiffies(wdev->cac_time_ms);
 782                 WARN_ON(!time_after_eq(jiffies, timeout));
 783                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 784                 break;
 785         case NL80211_RADAR_CAC_ABORTED:
 786                 break;
 787         default:
 788                 WARN_ON(1);
 789                 return;
 790         }
 791         wdev->cac_started = false;
 792
 793         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 794 }
 795 EXPORT_SYMBOL(cfg80211_cac_event);