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, int uapsd_queues)
  23 {
  24         struct wireless_dev *wdev = dev->ieee80211_ptr;
  25         struct wiphy *wiphy = wdev->wiphy;
  26         struct cfg80211_registered_device *rdev = wiphy_to_rdev(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, uapsd_queues);
  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_rdev(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_rdev(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_rdev(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_rdev(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_rdev(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_rdev(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                                    IEEE80211_BSS_TYPE_ESS,
 233                                    IEEE80211_PRIVACY_ANY);
 234         if (!req.bss)
 235                 return -ENOENT;
 236
 237         err = rdev_auth(rdev, dev, &req);
 238
 239         cfg80211_put_bss(&rdev->wiphy, req.bss);
 240         return err;
 241 }
 242
 243 /*  Do a logical ht_capa &= ht_capa_mask.  */
 244 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 245                                const struct ieee80211_ht_cap *ht_capa_mask)
 246 {
 247         int i;
 248         u8 *p1, *p2;
 249         if (!ht_capa_mask) {
 250                 memset(ht_capa, 0, sizeof(*ht_capa));
 251                 return;
 252         }
 253
 254         p1 = (u8*)(ht_capa);
 255         p2 = (u8*)(ht_capa_mask);
 256         for (i = 0; i<sizeof(*ht_capa); i++)
 257                 p1[i] &= p2[i];
 258 }
 259
 260 /*  Do a logical ht_capa &= ht_capa_mask.  */
 261 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 262                                 const struct ieee80211_vht_cap *vht_capa_mask)
 263 {
 264         int i;
 265         u8 *p1, *p2;
 266         if (!vht_capa_mask) {
 267                 memset(vht_capa, 0, sizeof(*vht_capa));
 268                 return;
 269         }
 270
 271         p1 = (u8*)(vht_capa);
 272         p2 = (u8*)(vht_capa_mask);
 273         for (i = 0; i < sizeof(*vht_capa); i++)
 274                 p1[i] &= p2[i];
 275 }
 276
 277 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 278                         struct net_device *dev,
 279                         struct ieee80211_channel *chan,
 280                         const u8 *bssid,
 281                         const u8 *ssid, int ssid_len,
 282                         struct cfg80211_assoc_request *req)
 283 {
 284         struct wireless_dev *wdev = dev->ieee80211_ptr;
 285         int err;
 286
 287         ASSERT_WDEV_LOCK(wdev);
 288
 289         if (wdev->current_bss &&
 290             (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
 291                                                    req->prev_bssid)))
 292                 return -EALREADY;
 293
 294         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 295                                   rdev->wiphy.ht_capa_mod_mask);
 296         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 297                                    rdev->wiphy.vht_capa_mod_mask);
 298
 299         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 300                                     IEEE80211_BSS_TYPE_ESS,
 301                                     IEEE80211_PRIVACY_ANY);
 302         if (!req->bss)
 303                 return -ENOENT;
 304
 305         err = rdev_assoc(rdev, dev, req);
 306         if (!err)
 307                 cfg80211_hold_bss(bss_from_pub(req->bss));
 308         else
 309                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 310
 311         return err;
 312 }
 313
 314 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 315                          struct net_device *dev, const u8 *bssid,
 316                          const u8 *ie, int ie_len, u16 reason,
 317                          bool local_state_change)
 318 {
 319         struct wireless_dev *wdev = dev->ieee80211_ptr;
 320         struct cfg80211_deauth_request req = {
 321                 .bssid = bssid,
 322                 .reason_code = reason,
 323                 .ie = ie,
 324                 .ie_len = ie_len,
 325                 .local_state_change = local_state_change,
 326         };
 327
 328         ASSERT_WDEV_LOCK(wdev);
 329
 330         if (local_state_change &&
 331             (!wdev->current_bss ||
 332              !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 333                 return 0;
 334
 335         return rdev_deauth(rdev, dev, &req);
 336 }
 337
 338 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 339                            struct net_device *dev, const u8 *bssid,
 340                            const u8 *ie, int ie_len, u16 reason,
 341                            bool local_state_change)
 342 {
 343         struct wireless_dev *wdev = dev->ieee80211_ptr;
 344         struct cfg80211_disassoc_request req = {
 345                 .reason_code = reason,
 346                 .local_state_change = local_state_change,
 347                 .ie = ie,
 348                 .ie_len = ie_len,
 349         };
 350         int err;
 351
 352         ASSERT_WDEV_LOCK(wdev);
 353
 354         if (!wdev->current_bss)
 355                 return -ENOTCONN;
 356
 357         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 358                 req.bss = &wdev->current_bss->pub;
 359         else
 360                 return -ENOTCONN;
 361
 362         err = rdev_disassoc(rdev, dev, &req);
 363         if (err)
 364                 return err;
 365
 366         /* driver should have reported the disassoc */
 367         WARN_ON(wdev->current_bss);
 368         return 0;
 369 }
 370
 371 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 372                         struct net_device *dev)
 373 {
 374         struct wireless_dev *wdev = dev->ieee80211_ptr;
 375         u8 bssid[ETH_ALEN];
 376
 377         ASSERT_WDEV_LOCK(wdev);
 378
 379         if (!rdev->ops->deauth)
 380                 return;
 381
 382         if (!wdev->current_bss)
 383                 return;
 384
 385         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 386         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 387                              WLAN_REASON_DEAUTH_LEAVING, false);
 388 }
 389
 390 struct cfg80211_mgmt_registration {
 391         struct list_head list;
 392
 393         u32 nlportid;
 394
 395         int match_len;
 396
 397         __le16 frame_type;
 398
 399         u8 match[];
 400 };
 401
 402 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 403                                 u16 frame_type, const u8 *match_data,
 404                                 int match_len)
 405 {
 406         struct wiphy *wiphy = wdev->wiphy;
 407         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 408         struct cfg80211_mgmt_registration *reg, *nreg;
 409         int err = 0;
 410         u16 mgmt_type;
 411
 412         if (!wdev->wiphy->mgmt_stypes)
 413                 return -EOPNOTSUPP;
 414
 415         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
 416                 return -EINVAL;
 417
 418         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 419                 return -EINVAL;
 420
 421         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 422         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
 423                 return -EINVAL;
 424
 425         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 426         if (!nreg)
 427                 return -ENOMEM;
 428
 429         spin_lock_bh(&wdev->mgmt_registrations_lock);
 430
 431         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 432                 int mlen = min(match_len, reg->match_len);
 433
 434                 if (frame_type != le16_to_cpu(reg->frame_type))
 435                         continue;
 436
 437                 if (memcmp(reg->match, match_data, mlen) == 0) {
 438                         err = -EALREADY;
 439                         break;
 440                 }
 441         }
 442
 443         if (err) {
 444                 kfree(nreg);
 445                 goto out;
 446         }
 447
 448         memcpy(nreg->match, match_data, match_len);
 449         nreg->match_len = match_len;
 450         nreg->nlportid = snd_portid;
 451         nreg->frame_type = cpu_to_le16(frame_type);
 452         list_add(&nreg->list, &wdev->mgmt_registrations);
 453
 454         if (rdev->ops->mgmt_frame_register)
 455                 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
 456
 457  out:
 458         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 459
 460         return err;
 461 }
 462
 463 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 464 {
 465         struct wiphy *wiphy = wdev->wiphy;
 466         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 467         struct cfg80211_mgmt_registration *reg, *tmp;
 468
 469         spin_lock_bh(&wdev->mgmt_registrations_lock);
 470
 471         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 472                 if (reg->nlportid != nlportid)
 473                         continue;
 474
 475                 if (rdev->ops->mgmt_frame_register) {
 476                         u16 frame_type = le16_to_cpu(reg->frame_type);
 477
 478                         rdev_mgmt_frame_register(rdev, wdev,
 479                                                  frame_type, false);
 480                 }
 481
 482                 list_del(&reg->list);
 483                 kfree(reg);
 484         }
 485
 486         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 487
 488         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 489                 rdev->crit_proto_nlportid = 0;
 490                 rdev_crit_proto_stop(rdev, wdev);
 491         }
 492
 493         if (nlportid == wdev->ap_unexpected_nlportid)
 494                 wdev->ap_unexpected_nlportid = 0;
 495 }
 496
 497 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 498 {
 499         struct cfg80211_mgmt_registration *reg, *tmp;
 500
 501         spin_lock_bh(&wdev->mgmt_registrations_lock);
 502
 503         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 504                 list_del(&reg->list);
 505                 kfree(reg);
 506         }
 507
 508         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 509 }
 510
 511 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 512                           struct wireless_dev *wdev,
 513                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 514 {
 515         const struct ieee80211_mgmt *mgmt;
 516         u16 stype;
 517
 518         if (!wdev->wiphy->mgmt_stypes)
 519                 return -EOPNOTSUPP;
 520
 521         if (!rdev->ops->mgmt_tx)
 522                 return -EOPNOTSUPP;
 523
 524         if (params->len < 24 + 1)
 525                 return -EINVAL;
 526
 527         mgmt = (const struct ieee80211_mgmt *)params->buf;
 528
 529         if (!ieee80211_is_mgmt(mgmt->frame_control))
 530                 return -EINVAL;
 531
 532         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 533         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 534                 return -EINVAL;
 535
 536         if (ieee80211_is_action(mgmt->frame_control) &&
 537             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 538                 int err = 0;
 539
 540                 wdev_lock(wdev);
 541
 542                 switch (wdev->iftype) {
 543                 case NL80211_IFTYPE_ADHOC:
 544                 case NL80211_IFTYPE_STATION:
 545                 case NL80211_IFTYPE_P2P_CLIENT:
 546                         if (!wdev->current_bss) {
 547                                 err = -ENOTCONN;
 548                                 break;
 549                         }
 550
 551                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 552                                               mgmt->bssid)) {
 553                                 err = -ENOTCONN;
 554                                 break;
 555                         }
 556
 557                         /*
 558                          * check for IBSS DA must be done by driver as
 559                          * cfg80211 doesn't track the stations
 560                          */
 561                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 562                                 break;
 563
 564                         /* for station, check that DA is the AP */
 565                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 566                                               mgmt->da)) {
 567                                 err = -ENOTCONN;
 568                                 break;
 569                         }
 570                         break;
 571                 case NL80211_IFTYPE_AP:
 572                 case NL80211_IFTYPE_P2P_GO:
 573                 case NL80211_IFTYPE_AP_VLAN:
 574                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 575                                 err = -EINVAL;
 576                         break;
 577                 case NL80211_IFTYPE_MESH_POINT:
 578                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 579                                 err = -EINVAL;
 580                                 break;
 581                         }
 582                         /*
 583                          * check for mesh DA must be done by driver as
 584                          * cfg80211 doesn't track the stations
 585                          */
 586                         break;
 587                 case NL80211_IFTYPE_P2P_DEVICE:
 588                         /*
 589                          * fall through, P2P device only supports
 590                          * public action frames
 591                          */
 592                 default:
 593                         err = -EOPNOTSUPP;
 594                         break;
 595                 }
 596                 wdev_unlock(wdev);
 597
 598                 if (err)
 599                         return err;
 600         }
 601
 602         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
 603                 return -EINVAL;
 604
 605         /* Transmit the Action frame as requested by user space */
 606         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 607 }
 608
 609 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 610                       const u8 *buf, size_t len, u32 flags)
 611 {
 612         struct wiphy *wiphy = wdev->wiphy;
 613         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 614         struct cfg80211_mgmt_registration *reg;
 615         const struct ieee80211_txrx_stypes *stypes =
 616                 &wiphy->mgmt_stypes[wdev->iftype];
 617         struct ieee80211_mgmt *mgmt = (void *)buf;
 618         const u8 *data;
 619         int data_len;
 620         bool result = false;
 621         __le16 ftype = mgmt->frame_control &
 622                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 623         u16 stype;
 624
 625         trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
 626         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 627
 628         if (!(stypes->rx & BIT(stype))) {
 629                 trace_cfg80211_return_bool(false);
 630                 return false;
 631         }
 632
 633         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 634         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 635
 636         spin_lock_bh(&wdev->mgmt_registrations_lock);
 637
 638         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 639                 if (reg->frame_type != ftype)
 640                         continue;
 641
 642                 if (reg->match_len > data_len)
 643                         continue;
 644
 645                 if (memcmp(reg->match, data, reg->match_len))
 646                         continue;
 647
 648                 /* found match! */
 649
 650                 /* Indicate the received Action frame to user space */
 651                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 652                                       freq, sig_mbm,
 653                                       buf, len, flags, GFP_ATOMIC))
 654                         continue;
 655
 656                 result = true;
 657                 break;
 658         }
 659
 660         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 661
 662         trace_cfg80211_return_bool(result);
 663         return result;
 664 }
 665 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 666
 667 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 668 {
 669         struct delayed_work *delayed_work;
 670         struct cfg80211_registered_device *rdev;
 671         struct cfg80211_chan_def chandef;
 672         struct ieee80211_supported_band *sband;
 673         struct ieee80211_channel *c;
 674         struct wiphy *wiphy;
 675         bool check_again = false;
 676         unsigned long timeout, next_time = 0;
 677         int bandid, i;
 678
 679         delayed_work = container_of(work, struct delayed_work, work);
 680         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 681                             dfs_update_channels_wk);
 682         wiphy = &rdev->wiphy;
 683
 684         rtnl_lock();
 685         for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
 686                 sband = wiphy->bands[bandid];
 687                 if (!sband)
 688                         continue;
 689
 690                 for (i = 0; i < sband->n_channels; i++) {
 691                         c = &sband->channels[i];
 692
 693                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
 694                                 continue;
 695
 696                         timeout = c->dfs_state_entered + msecs_to_jiffies(
 697                                         IEEE80211_DFS_MIN_NOP_TIME_MS);
 698
 699                         if (time_after_eq(jiffies, timeout)) {
 700                                 c->dfs_state = NL80211_DFS_USABLE;
 701                                 c->dfs_state_entered = jiffies;
 702
 703                                 cfg80211_chandef_create(&chandef, c,
 704                                                         NL80211_CHAN_NO_HT);
 705
 706                                 nl80211_radar_notify(rdev, &chandef,
 707                                                      NL80211_RADAR_NOP_FINISHED,
 708                                                      NULL, GFP_ATOMIC);
 709                                 continue;
 710                         }
 711
 712                         if (!check_again)
 713                                 next_time = timeout - jiffies;
 714                         else
 715                                 next_time = min(next_time, timeout - jiffies);
 716                         check_again = true;
 717                 }
 718         }
 719         rtnl_unlock();
 720
 721         /* reschedule if there are other channels waiting to be cleared again */
 722         if (check_again)
 723                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 724                                    next_time);
 725 }
 726
 727
 728 void cfg80211_radar_event(struct wiphy *wiphy,
 729                           struct cfg80211_chan_def *chandef,
 730                           gfp_t gfp)
 731 {
 732         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 733         unsigned long timeout;
 734
 735         trace_cfg80211_radar_event(wiphy, chandef);
 736
 737         /* only set the chandef supplied channel to unavailable, in
 738          * case the radar is detected on only one of multiple channels
 739          * spanned by the chandef.
 740          */
 741         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 742
 743         timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
 744         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 745                            timeout);
 746
 747         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 748 }
 749 EXPORT_SYMBOL(cfg80211_radar_event);
 750
 751 void cfg80211_cac_event(struct net_device *netdev,
 752                         const struct cfg80211_chan_def *chandef,
 753                         enum nl80211_radar_event event, gfp_t gfp)
 754 {
 755         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 756         struct wiphy *wiphy = wdev->wiphy;
 757         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 758         unsigned long timeout;
 759
 760         trace_cfg80211_cac_event(netdev, event);
 761
 762         if (WARN_ON(!wdev->cac_started))
 763                 return;
 764
 765         if (WARN_ON(!wdev->chandef.chan))
 766                 return;
 767
 768         switch (event) {
 769         case NL80211_RADAR_CAC_FINISHED:
 770                 timeout = wdev->cac_start_time +
 771                           msecs_to_jiffies(wdev->cac_time_ms);
 772                 WARN_ON(!time_after_eq(jiffies, timeout));
 773                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 774                 break;
 775         case NL80211_RADAR_CAC_ABORTED:
 776                 break;
 777         default:
 778                 WARN_ON(1);
 779                 return;
 780         }
 781         wdev->cac_started = false;
 782
 783         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 784 }
 785 EXPORT_SYMBOL(cfg80211_cac_event);