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