net/wireless/mlme.c

   1 /*
   2  * cfg80211 MLME SAP interface
   3  *
   4  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   5  * Copyright (c) 2015           Intel Deutschland GmbH
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/nl80211.h>
  13 #include <linux/slab.h>
  14 #include <linux/wireless.h>
  15 #include <net/cfg80211.h>
  16 #include <net/iw_handler.h>
  17 #include "core.h"
  18 #include "nl80211.h"
  19 #include "rdev-ops.h"
  20
  21
  22 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
  23                             const u8 *buf, size_t len, int uapsd_queues)
  24 {
  25         struct wireless_dev *wdev = dev->ieee80211_ptr;
  26         struct wiphy *wiphy = wdev->wiphy;
  27         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  28         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  29         u8 *ie = mgmt->u.assoc_resp.variable;
  30         int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
  31         u16 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
  32
  33         trace_cfg80211_send_rx_assoc(dev, bss);
  34
  35         /*
  36          * This is a bit of a hack, we don't notify userspace of
  37          * a (re-)association reply if we tried to send a reassoc
  38          * and got a reject -- we only try again with an assoc
  39          * frame instead of reassoc.
  40          */
  41         if (cfg80211_sme_rx_assoc_resp(wdev, status_code)) {
  42                 cfg80211_unhold_bss(bss_from_pub(bss));
  43                 cfg80211_put_bss(wiphy, bss);
  44                 return;
  45         }
  46
  47         nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues);
  48         /* update current_bss etc., consumes the bss reference */
  49         __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
  50                                   status_code,
  51                                   status_code == WLAN_STATUS_SUCCESS, bss);
  52 }
  53 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
  54
  55 static void cfg80211_process_auth(struct wireless_dev *wdev,
  56                                   const u8 *buf, size_t len)
  57 {
  58         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  59
  60         nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  61         cfg80211_sme_rx_auth(wdev, buf, len);
  62 }
  63
  64 static void cfg80211_process_deauth(struct wireless_dev *wdev,
  65                                     const u8 *buf, size_t len)
  66 {
  67         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  68         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  69         const u8 *bssid = mgmt->bssid;
  70         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
  71         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
  72
  73         nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  74
  75         if (!wdev->current_bss ||
  76             !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
  77                 return;
  78
  79         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
  80         cfg80211_sme_deauth(wdev);
  81 }
  82
  83 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
  84                                       const u8 *buf, size_t len)
  85 {
  86         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  87         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
  88         const u8 *bssid = mgmt->bssid;
  89         u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
  90         bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
  91
  92         nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);
  93
  94         if (WARN_ON(!wdev->current_bss ||
  95                     !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
  96                 return;
  97
  98         __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
  99         cfg80211_sme_disassoc(wdev);
 100 }
 101
 102 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 103 {
 104         struct wireless_dev *wdev = dev->ieee80211_ptr;
 105         struct ieee80211_mgmt *mgmt = (void *)buf;
 106
 107         ASSERT_WDEV_LOCK(wdev);
 108
 109         trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
 110
 111         if (WARN_ON(len < 2))
 112                 return;
 113
 114         if (ieee80211_is_auth(mgmt->frame_control))
 115                 cfg80211_process_auth(wdev, buf, len);
 116         else if (ieee80211_is_deauth(mgmt->frame_control))
 117                 cfg80211_process_deauth(wdev, buf, len);
 118         else if (ieee80211_is_disassoc(mgmt->frame_control))
 119                 cfg80211_process_disassoc(wdev, buf, len);
 120 }
 121 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
 122
 123 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
 124 {
 125         struct wireless_dev *wdev = dev->ieee80211_ptr;
 126         struct wiphy *wiphy = wdev->wiphy;
 127         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 128
 129         trace_cfg80211_send_auth_timeout(dev, addr);
 130
 131         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
 132         cfg80211_sme_auth_timeout(wdev);
 133 }
 134 EXPORT_SYMBOL(cfg80211_auth_timeout);
 135
 136 void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
 137 {
 138         struct wireless_dev *wdev = dev->ieee80211_ptr;
 139         struct wiphy *wiphy = wdev->wiphy;
 140         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 141
 142         trace_cfg80211_send_assoc_timeout(dev, bss->bssid);
 143
 144         nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
 145         cfg80211_sme_assoc_timeout(wdev);
 146
 147         cfg80211_unhold_bss(bss_from_pub(bss));
 148         cfg80211_put_bss(wiphy, bss);
 149 }
 150 EXPORT_SYMBOL(cfg80211_assoc_timeout);
 151
 152 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 153 {
 154         struct wireless_dev *wdev = dev->ieee80211_ptr;
 155         struct ieee80211_mgmt *mgmt = (void *)buf;
 156
 157         ASSERT_WDEV_LOCK(wdev);
 158
 159         trace_cfg80211_tx_mlme_mgmt(dev, buf, len);
 160
 161         if (WARN_ON(len < 2))
 162                 return;
 163
 164         if (ieee80211_is_deauth(mgmt->frame_control))
 165                 cfg80211_process_deauth(wdev, buf, len);
 166         else
 167                 cfg80211_process_disassoc(wdev, buf, len);
 168 }
 169 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 170
 171 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 172                                   enum nl80211_key_type key_type, int key_id,
 173                                   const u8 *tsc, gfp_t gfp)
 174 {
 175         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 176         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 177 #ifdef CONFIG_CFG80211_WEXT
 178         union iwreq_data wrqu;
 179         char *buf = kmalloc(128, gfp);
 180
 181         if (buf) {
 182                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 183                         "keyid=%d %scast addr=%pM)", key_id,
 184                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 185                         addr);
 186                 memset(&wrqu, 0, sizeof(wrqu));
 187                 wrqu.data.length = strlen(buf);
 188                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 189                 kfree(buf);
 190         }
 191 #endif
 192
 193         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 194         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 195 }
 196 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 197
 198 /* some MLME handling for userspace SME */
 199 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 200                        struct net_device *dev,
 201                        struct ieee80211_channel *chan,
 202                        enum nl80211_auth_type auth_type,
 203                        const u8 *bssid,
 204                        const u8 *ssid, int ssid_len,
 205                        const u8 *ie, int ie_len,
 206                        const u8 *key, int key_len, int key_idx,
 207                        const u8 *auth_data, int auth_data_len)
 208 {
 209         struct wireless_dev *wdev = dev->ieee80211_ptr;
 210         struct cfg80211_auth_request req = {
 211                 .ie = ie,
 212                 .ie_len = ie_len,
 213                 .auth_data = auth_data,
 214                 .auth_data_len = auth_data_len,
 215                 .auth_type = auth_type,
 216                 .key = key,
 217                 .key_len = key_len,
 218                 .key_idx = key_idx,
 219         };
 220         int err;
 221
 222         ASSERT_WDEV_LOCK(wdev);
 223
 224         if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
 225                 if (!key || !key_len || key_idx < 0 || key_idx > 3)
 226                         return -EINVAL;
 227
 228         if (wdev->current_bss &&
 229             ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
 230                 return -EALREADY;
 231
 232         req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 233                                    IEEE80211_BSS_TYPE_ESS,
 234                                    IEEE80211_PRIVACY_ANY);
 235         if (!req.bss)
 236                 return -ENOENT;
 237
 238         err = rdev_auth(rdev, dev, &req);
 239
 240         cfg80211_put_bss(&rdev->wiphy, req.bss);
 241         return err;
 242 }
 243
 244 /*  Do a logical ht_capa &= ht_capa_mask.  */
 245 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 246                                const struct ieee80211_ht_cap *ht_capa_mask)
 247 {
 248         int i;
 249         u8 *p1, *p2;
 250         if (!ht_capa_mask) {
 251                 memset(ht_capa, 0, sizeof(*ht_capa));
 252                 return;
 253         }
 254
 255         p1 = (u8*)(ht_capa);
 256         p2 = (u8*)(ht_capa_mask);
 257         for (i = 0; i<sizeof(*ht_capa); i++)
 258                 p1[i] &= p2[i];
 259 }
 260
 261 /*  Do a logical ht_capa &= ht_capa_mask.  */
 262 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 263                                 const struct ieee80211_vht_cap *vht_capa_mask)
 264 {
 265         int i;
 266         u8 *p1, *p2;
 267         if (!vht_capa_mask) {
 268                 memset(vht_capa, 0, sizeof(*vht_capa));
 269                 return;
 270         }
 271
 272         p1 = (u8*)(vht_capa);
 273         p2 = (u8*)(vht_capa_mask);
 274         for (i = 0; i < sizeof(*vht_capa); i++)
 275                 p1[i] &= p2[i];
 276 }
 277
 278 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 279                         struct net_device *dev,
 280                         struct ieee80211_channel *chan,
 281                         const u8 *bssid,
 282                         const u8 *ssid, int ssid_len,
 283                         struct cfg80211_assoc_request *req)
 284 {
 285         struct wireless_dev *wdev = dev->ieee80211_ptr;
 286         int err;
 287
 288         ASSERT_WDEV_LOCK(wdev);
 289
 290         if (wdev->current_bss &&
 291             (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
 292                                                    req->prev_bssid)))
 293                 return -EALREADY;
 294
 295         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 296                                   rdev->wiphy.ht_capa_mod_mask);
 297         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 298                                    rdev->wiphy.vht_capa_mod_mask);
 299
 300         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 301                                     IEEE80211_BSS_TYPE_ESS,
 302                                     IEEE80211_PRIVACY_ANY);
 303         if (!req->bss)
 304                 return -ENOENT;
 305
 306         err = rdev_assoc(rdev, dev, req);
 307         if (!err)
 308                 cfg80211_hold_bss(bss_from_pub(req->bss));
 309         else
 310                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 311
 312         return err;
 313 }
 314
 315 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 316                          struct net_device *dev, const u8 *bssid,
 317                          const u8 *ie, int ie_len, u16 reason,
 318                          bool local_state_change)
 319 {
 320         struct wireless_dev *wdev = dev->ieee80211_ptr;
 321         struct cfg80211_deauth_request req = {
 322                 .bssid = bssid,
 323                 .reason_code = reason,
 324                 .ie = ie,
 325                 .ie_len = ie_len,
 326                 .local_state_change = local_state_change,
 327         };
 328
 329         ASSERT_WDEV_LOCK(wdev);
 330
 331         if (local_state_change &&
 332             (!wdev->current_bss ||
 333              !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 334                 return 0;
 335
 336         return rdev_deauth(rdev, dev, &req);
 337 }
 338
 339 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 340                            struct net_device *dev, const u8 *bssid,
 341                            const u8 *ie, int ie_len, u16 reason,
 342                            bool local_state_change)
 343 {
 344         struct wireless_dev *wdev = dev->ieee80211_ptr;
 345         struct cfg80211_disassoc_request req = {
 346                 .reason_code = reason,
 347                 .local_state_change = local_state_change,
 348                 .ie = ie,
 349                 .ie_len = ie_len,
 350         };
 351         int err;
 352
 353         ASSERT_WDEV_LOCK(wdev);
 354
 355         if (!wdev->current_bss)
 356                 return -ENOTCONN;
 357
 358         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 359                 req.bss = &wdev->current_bss->pub;
 360         else
 361                 return -ENOTCONN;
 362
 363         err = rdev_disassoc(rdev, dev, &req);
 364         if (err)
 365                 return err;
 366
 367         /* driver should have reported the disassoc */
 368         WARN_ON(wdev->current_bss);
 369         return 0;
 370 }
 371
 372 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 373                         struct net_device *dev)
 374 {
 375         struct wireless_dev *wdev = dev->ieee80211_ptr;
 376         u8 bssid[ETH_ALEN];
 377
 378         ASSERT_WDEV_LOCK(wdev);
 379
 380         if (!rdev->ops->deauth)
 381                 return;
 382
 383         if (!wdev->current_bss)
 384                 return;
 385
 386         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 387         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 388                              WLAN_REASON_DEAUTH_LEAVING, false);
 389 }
 390
 391 struct cfg80211_mgmt_registration {
 392         struct list_head list;
 393         struct wireless_dev *wdev;
 394
 395         u32 nlportid;
 396
 397         int match_len;
 398
 399         __le16 frame_type;
 400
 401         u8 match[];
 402 };
 403
 404 static void
 405 cfg80211_process_mlme_unregistrations(struct cfg80211_registered_device *rdev)
 406 {
 407         struct cfg80211_mgmt_registration *reg;
 408
 409         ASSERT_RTNL();
 410
 411         spin_lock_bh(&rdev->mlme_unreg_lock);
 412         while ((reg = list_first_entry_or_null(&rdev->mlme_unreg,
 413                                                struct cfg80211_mgmt_registration,
 414                                                list))) {
 415                 list_del(&reg->list);
 416                 spin_unlock_bh(&rdev->mlme_unreg_lock);
 417
 418                 if (rdev->ops->mgmt_frame_register) {
 419                         u16 frame_type = le16_to_cpu(reg->frame_type);
 420
 421                         rdev_mgmt_frame_register(rdev, reg->wdev,
 422                                                  frame_type, false);
 423                 }
 424
 425                 kfree(reg);
 426
 427                 spin_lock_bh(&rdev->mlme_unreg_lock);
 428         }
 429         spin_unlock_bh(&rdev->mlme_unreg_lock);
 430 }
 431
 432 void cfg80211_mlme_unreg_wk(struct work_struct *wk)
 433 {
 434         struct cfg80211_registered_device *rdev;
 435
 436         rdev = container_of(wk, struct cfg80211_registered_device,
 437                             mlme_unreg_wk);
 438
 439         rtnl_lock();
 440         cfg80211_process_mlme_unregistrations(rdev);
 441         rtnl_unlock();
 442 }
 443
 444 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 445                                 u16 frame_type, const u8 *match_data,
 446                                 int match_len)
 447 {
 448         struct wiphy *wiphy = wdev->wiphy;
 449         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 450         struct cfg80211_mgmt_registration *reg, *nreg;
 451         int err = 0;
 452         u16 mgmt_type;
 453
 454         if (!wdev->wiphy->mgmt_stypes)
 455                 return -EOPNOTSUPP;
 456
 457         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
 458                 return -EINVAL;
 459
 460         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 461                 return -EINVAL;
 462
 463         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 464         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
 465                 return -EINVAL;
 466
 467         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 468         if (!nreg)
 469                 return -ENOMEM;
 470
 471         spin_lock_bh(&wdev->mgmt_registrations_lock);
 472
 473         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 474                 int mlen = min(match_len, reg->match_len);
 475
 476                 if (frame_type != le16_to_cpu(reg->frame_type))
 477                         continue;
 478
 479                 if (memcmp(reg->match, match_data, mlen) == 0) {
 480                         err = -EALREADY;
 481                         break;
 482                 }
 483         }
 484
 485         if (err) {
 486                 kfree(nreg);
 487                 goto out;
 488         }
 489
 490         memcpy(nreg->match, match_data, match_len);
 491         nreg->match_len = match_len;
 492         nreg->nlportid = snd_portid;
 493         nreg->frame_type = cpu_to_le16(frame_type);
 494         nreg->wdev = wdev;
 495         list_add(&nreg->list, &wdev->mgmt_registrations);
 496         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 497
 498         /* process all unregistrations to avoid driver confusion */
 499         cfg80211_process_mlme_unregistrations(rdev);
 500
 501         if (rdev->ops->mgmt_frame_register)
 502                 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
 503
 504         return 0;
 505
 506  out:
 507         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 508
 509         return err;
 510 }
 511
 512 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 513 {
 514         struct wiphy *wiphy = wdev->wiphy;
 515         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 516         struct cfg80211_mgmt_registration *reg, *tmp;
 517
 518         spin_lock_bh(&wdev->mgmt_registrations_lock);
 519
 520         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 521                 if (reg->nlportid != nlportid)
 522                         continue;
 523
 524                 list_del(&reg->list);
 525                 spin_lock(&rdev->mlme_unreg_lock);
 526                 list_add_tail(&reg->list, &rdev->mlme_unreg);
 527                 spin_unlock(&rdev->mlme_unreg_lock);
 528
 529                 schedule_work(&rdev->mlme_unreg_wk);
 530         }
 531
 532         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 533
 534         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 535                 rdev->crit_proto_nlportid = 0;
 536                 rdev_crit_proto_stop(rdev, wdev);
 537         }
 538
 539         if (nlportid == wdev->ap_unexpected_nlportid)
 540                 wdev->ap_unexpected_nlportid = 0;
 541 }
 542
 543 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 544 {
 545         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 546
 547         spin_lock_bh(&wdev->mgmt_registrations_lock);
 548         spin_lock(&rdev->mlme_unreg_lock);
 549         list_splice_tail_init(&wdev->mgmt_registrations, &rdev->mlme_unreg);
 550         spin_unlock(&rdev->mlme_unreg_lock);
 551         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 552
 553         cfg80211_process_mlme_unregistrations(rdev);
 554 }
 555
 556 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 557                           struct wireless_dev *wdev,
 558                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 559 {
 560         const struct ieee80211_mgmt *mgmt;
 561         u16 stype;
 562
 563         if (!wdev->wiphy->mgmt_stypes)
 564                 return -EOPNOTSUPP;
 565
 566         if (!rdev->ops->mgmt_tx)
 567                 return -EOPNOTSUPP;
 568
 569         if (params->len < 24 + 1)
 570                 return -EINVAL;
 571
 572         mgmt = (const struct ieee80211_mgmt *)params->buf;
 573
 574         if (!ieee80211_is_mgmt(mgmt->frame_control))
 575                 return -EINVAL;
 576
 577         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 578         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 579                 return -EINVAL;
 580
 581         if (ieee80211_is_action(mgmt->frame_control) &&
 582             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 583                 int err = 0;
 584
 585                 wdev_lock(wdev);
 586
 587                 switch (wdev->iftype) {
 588                 case NL80211_IFTYPE_ADHOC:
 589                 case NL80211_IFTYPE_STATION:
 590                 case NL80211_IFTYPE_P2P_CLIENT:
 591                         if (!wdev->current_bss) {
 592                                 err = -ENOTCONN;
 593                                 break;
 594                         }
 595
 596                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 597                                               mgmt->bssid)) {
 598                                 err = -ENOTCONN;
 599                                 break;
 600                         }
 601
 602                         /*
 603                          * check for IBSS DA must be done by driver as
 604                          * cfg80211 doesn't track the stations
 605                          */
 606                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 607                                 break;
 608
 609                         /* for station, check that DA is the AP */
 610                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 611                                               mgmt->da)) {
 612                                 err = -ENOTCONN;
 613                                 break;
 614                         }
 615                         break;
 616                 case NL80211_IFTYPE_AP:
 617                 case NL80211_IFTYPE_P2P_GO:
 618                 case NL80211_IFTYPE_AP_VLAN:
 619                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 620                                 err = -EINVAL;
 621                         break;
 622                 case NL80211_IFTYPE_MESH_POINT:
 623                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 624                                 err = -EINVAL;
 625                                 break;
 626                         }
 627                         /*
 628                          * check for mesh DA must be done by driver as
 629                          * cfg80211 doesn't track the stations
 630                          */
 631                         break;
 632                 case NL80211_IFTYPE_P2P_DEVICE:
 633                         /*
 634                          * fall through, P2P device only supports
 635                          * public action frames
 636                          */
 637                 case NL80211_IFTYPE_NAN:
 638                 default:
 639                         err = -EOPNOTSUPP;
 640                         break;
 641                 }
 642                 wdev_unlock(wdev);
 643
 644                 if (err)
 645                         return err;
 646         }
 647
 648         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
 649                 return -EINVAL;
 650
 651         /* Transmit the Action frame as requested by user space */
 652         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 653 }
 654
 655 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 656                       const u8 *buf, size_t len, u32 flags)
 657 {
 658         struct wiphy *wiphy = wdev->wiphy;
 659         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 660         struct cfg80211_mgmt_registration *reg;
 661         const struct ieee80211_txrx_stypes *stypes =
 662                 &wiphy->mgmt_stypes[wdev->iftype];
 663         struct ieee80211_mgmt *mgmt = (void *)buf;
 664         const u8 *data;
 665         int data_len;
 666         bool result = false;
 667         __le16 ftype = mgmt->frame_control &
 668                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 669         u16 stype;
 670
 671         trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
 672         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 673
 674         if (!(stypes->rx & BIT(stype))) {
 675                 trace_cfg80211_return_bool(false);
 676                 return false;
 677         }
 678
 679         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 680         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 681
 682         spin_lock_bh(&wdev->mgmt_registrations_lock);
 683
 684         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 685                 if (reg->frame_type != ftype)
 686                         continue;
 687
 688                 if (reg->match_len > data_len)
 689                         continue;
 690
 691                 if (memcmp(reg->match, data, reg->match_len))
 692                         continue;
 693
 694                 /* found match! */
 695
 696                 /* Indicate the received Action frame to user space */
 697                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 698                                       freq, sig_mbm,
 699                                       buf, len, flags, GFP_ATOMIC))
 700                         continue;
 701
 702                 result = true;
 703                 break;
 704         }
 705
 706         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 707
 708         trace_cfg80211_return_bool(result);
 709         return result;
 710 }
 711 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 712
 713 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 714 {
 715         struct delayed_work *delayed_work = to_delayed_work(work);
 716         struct cfg80211_registered_device *rdev;
 717         struct cfg80211_chan_def chandef;
 718         struct ieee80211_supported_band *sband;
 719         struct ieee80211_channel *c;
 720         struct wiphy *wiphy;
 721         bool check_again = false;
 722         unsigned long timeout, next_time = 0;
 723         int bandid, i;
 724
 725         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 726                             dfs_update_channels_wk);
 727         wiphy = &rdev->wiphy;
 728
 729         rtnl_lock();
 730         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 731                 sband = wiphy->bands[bandid];
 732                 if (!sband)
 733                         continue;
 734
 735                 for (i = 0; i < sband->n_channels; i++) {
 736                         c = &sband->channels[i];
 737
 738                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
 739                                 continue;
 740
 741                         timeout = c->dfs_state_entered + msecs_to_jiffies(
 742                                         IEEE80211_DFS_MIN_NOP_TIME_MS);
 743
 744                         if (time_after_eq(jiffies, timeout)) {
 745                                 c->dfs_state = NL80211_DFS_USABLE;
 746                                 c->dfs_state_entered = jiffies;
 747
 748                                 cfg80211_chandef_create(&chandef, c,
 749                                                         NL80211_CHAN_NO_HT);
 750
 751                                 nl80211_radar_notify(rdev, &chandef,
 752                                                      NL80211_RADAR_NOP_FINISHED,
 753                                                      NULL, GFP_ATOMIC);
 754                                 continue;
 755                         }
 756
 757                         if (!check_again)
 758                                 next_time = timeout - jiffies;
 759                         else
 760                                 next_time = min(next_time, timeout - jiffies);
 761                         check_again = true;
 762                 }
 763         }
 764         rtnl_unlock();
 765
 766         /* reschedule if there are other channels waiting to be cleared again */
 767         if (check_again)
 768                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 769                                    next_time);
 770 }
 771
 772
 773 void cfg80211_radar_event(struct wiphy *wiphy,
 774                           struct cfg80211_chan_def *chandef,
 775                           gfp_t gfp)
 776 {
 777         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 778         unsigned long timeout;
 779
 780         trace_cfg80211_radar_event(wiphy, chandef);
 781
 782         /* only set the chandef supplied channel to unavailable, in
 783          * case the radar is detected on only one of multiple channels
 784          * spanned by the chandef.
 785          */
 786         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 787
 788         timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
 789         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 790                            timeout);
 791
 792         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 793 }
 794 EXPORT_SYMBOL(cfg80211_radar_event);
 795
 796 void cfg80211_cac_event(struct net_device *netdev,
 797                         const struct cfg80211_chan_def *chandef,
 798                         enum nl80211_radar_event event, gfp_t gfp)
 799 {
 800         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 801         struct wiphy *wiphy = wdev->wiphy;
 802         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 803         unsigned long timeout;
 804
 805         trace_cfg80211_cac_event(netdev, event);
 806
 807         if (WARN_ON(!wdev->cac_started))
 808                 return;
 809
 810         if (WARN_ON(!wdev->chandef.chan))
 811                 return;
 812
 813         switch (event) {
 814         case NL80211_RADAR_CAC_FINISHED:
 815                 timeout = wdev->cac_start_time +
 816                           msecs_to_jiffies(wdev->cac_time_ms);
 817                 WARN_ON(!time_after_eq(jiffies, timeout));
 818                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 819                 break;
 820         case NL80211_RADAR_CAC_ABORTED:
 821                 break;
 822         default:
 823                 WARN_ON(1);
 824                 return;
 825         }
 826         wdev->cac_started = false;
 827
 828         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 829 }
 830 EXPORT_SYMBOL(cfg80211_cac_event);