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_abandon_assoc(struct net_device *dev, struct cfg80211_bss *bss)
 153 {
 154         struct wireless_dev *wdev = dev->ieee80211_ptr;
 155         struct wiphy *wiphy = wdev->wiphy;
 156
 157         cfg80211_sme_abandon_assoc(wdev);
 158
 159         cfg80211_unhold_bss(bss_from_pub(bss));
 160         cfg80211_put_bss(wiphy, bss);
 161 }
 162 EXPORT_SYMBOL(cfg80211_abandon_assoc);
 163
 164 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
 165 {
 166         struct wireless_dev *wdev = dev->ieee80211_ptr;
 167         struct ieee80211_mgmt *mgmt = (void *)buf;
 168
 169         ASSERT_WDEV_LOCK(wdev);
 170
 171         trace_cfg80211_tx_mlme_mgmt(dev, buf, len);
 172
 173         if (WARN_ON(len < 2))
 174                 return;
 175
 176         if (ieee80211_is_deauth(mgmt->frame_control))
 177                 cfg80211_process_deauth(wdev, buf, len);
 178         else
 179                 cfg80211_process_disassoc(wdev, buf, len);
 180 }
 181 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
 182
 183 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
 184                                   enum nl80211_key_type key_type, int key_id,
 185                                   const u8 *tsc, gfp_t gfp)
 186 {
 187         struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
 188         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 189 #ifdef CONFIG_CFG80211_WEXT
 190         union iwreq_data wrqu;
 191         char *buf = kmalloc(128, gfp);
 192
 193         if (buf) {
 194                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
 195                         "keyid=%d %scast addr=%pM)", key_id,
 196                         key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
 197                         addr);
 198                 memset(&wrqu, 0, sizeof(wrqu));
 199                 wrqu.data.length = strlen(buf);
 200                 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 201                 kfree(buf);
 202         }
 203 #endif
 204
 205         trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
 206         nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
 207 }
 208 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
 209
 210 /* some MLME handling for userspace SME */
 211 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 212                        struct net_device *dev,
 213                        struct ieee80211_channel *chan,
 214                        enum nl80211_auth_type auth_type,
 215                        const u8 *bssid,
 216                        const u8 *ssid, int ssid_len,
 217                        const u8 *ie, int ie_len,
 218                        const u8 *key, int key_len, int key_idx,
 219                        const u8 *auth_data, int auth_data_len)
 220 {
 221         struct wireless_dev *wdev = dev->ieee80211_ptr;
 222         struct cfg80211_auth_request req = {
 223                 .ie = ie,
 224                 .ie_len = ie_len,
 225                 .auth_data = auth_data,
 226                 .auth_data_len = auth_data_len,
 227                 .auth_type = auth_type,
 228                 .key = key,
 229                 .key_len = key_len,
 230                 .key_idx = key_idx,
 231         };
 232         int err;
 233
 234         ASSERT_WDEV_LOCK(wdev);
 235
 236         if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
 237                 if (!key || !key_len || key_idx < 0 || key_idx > 3)
 238                         return -EINVAL;
 239
 240         if (wdev->current_bss &&
 241             ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
 242                 return -EALREADY;
 243
 244         req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 245                                    IEEE80211_BSS_TYPE_ESS,
 246                                    IEEE80211_PRIVACY_ANY);
 247         if (!req.bss)
 248                 return -ENOENT;
 249
 250         err = rdev_auth(rdev, dev, &req);
 251
 252         cfg80211_put_bss(&rdev->wiphy, req.bss);
 253         return err;
 254 }
 255
 256 /*  Do a logical ht_capa &= ht_capa_mask.  */
 257 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
 258                                const struct ieee80211_ht_cap *ht_capa_mask)
 259 {
 260         int i;
 261         u8 *p1, *p2;
 262         if (!ht_capa_mask) {
 263                 memset(ht_capa, 0, sizeof(*ht_capa));
 264                 return;
 265         }
 266
 267         p1 = (u8*)(ht_capa);
 268         p2 = (u8*)(ht_capa_mask);
 269         for (i = 0; i<sizeof(*ht_capa); i++)
 270                 p1[i] &= p2[i];
 271 }
 272
 273 /*  Do a logical ht_capa &= ht_capa_mask.  */
 274 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
 275                                 const struct ieee80211_vht_cap *vht_capa_mask)
 276 {
 277         int i;
 278         u8 *p1, *p2;
 279         if (!vht_capa_mask) {
 280                 memset(vht_capa, 0, sizeof(*vht_capa));
 281                 return;
 282         }
 283
 284         p1 = (u8*)(vht_capa);
 285         p2 = (u8*)(vht_capa_mask);
 286         for (i = 0; i < sizeof(*vht_capa); i++)
 287                 p1[i] &= p2[i];
 288 }
 289
 290 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 291                         struct net_device *dev,
 292                         struct ieee80211_channel *chan,
 293                         const u8 *bssid,
 294                         const u8 *ssid, int ssid_len,
 295                         struct cfg80211_assoc_request *req)
 296 {
 297         struct wireless_dev *wdev = dev->ieee80211_ptr;
 298         int err;
 299
 300         ASSERT_WDEV_LOCK(wdev);
 301
 302         if (wdev->current_bss &&
 303             (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
 304                                                    req->prev_bssid)))
 305                 return -EALREADY;
 306
 307         cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
 308                                   rdev->wiphy.ht_capa_mod_mask);
 309         cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
 310                                    rdev->wiphy.vht_capa_mod_mask);
 311
 312         req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 313                                     IEEE80211_BSS_TYPE_ESS,
 314                                     IEEE80211_PRIVACY_ANY);
 315         if (!req->bss)
 316                 return -ENOENT;
 317
 318         err = rdev_assoc(rdev, dev, req);
 319         if (!err)
 320                 cfg80211_hold_bss(bss_from_pub(req->bss));
 321         else
 322                 cfg80211_put_bss(&rdev->wiphy, req->bss);
 323
 324         return err;
 325 }
 326
 327 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 328                          struct net_device *dev, const u8 *bssid,
 329                          const u8 *ie, int ie_len, u16 reason,
 330                          bool local_state_change)
 331 {
 332         struct wireless_dev *wdev = dev->ieee80211_ptr;
 333         struct cfg80211_deauth_request req = {
 334                 .bssid = bssid,
 335                 .reason_code = reason,
 336                 .ie = ie,
 337                 .ie_len = ie_len,
 338                 .local_state_change = local_state_change,
 339         };
 340
 341         ASSERT_WDEV_LOCK(wdev);
 342
 343         if (local_state_change &&
 344             (!wdev->current_bss ||
 345              !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
 346                 return 0;
 347
 348         return rdev_deauth(rdev, dev, &req);
 349 }
 350
 351 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 352                            struct net_device *dev, const u8 *bssid,
 353                            const u8 *ie, int ie_len, u16 reason,
 354                            bool local_state_change)
 355 {
 356         struct wireless_dev *wdev = dev->ieee80211_ptr;
 357         struct cfg80211_disassoc_request req = {
 358                 .reason_code = reason,
 359                 .local_state_change = local_state_change,
 360                 .ie = ie,
 361                 .ie_len = ie_len,
 362         };
 363         int err;
 364
 365         ASSERT_WDEV_LOCK(wdev);
 366
 367         if (!wdev->current_bss)
 368                 return -ENOTCONN;
 369
 370         if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
 371                 req.bss = &wdev->current_bss->pub;
 372         else
 373                 return -ENOTCONN;
 374
 375         err = rdev_disassoc(rdev, dev, &req);
 376         if (err)
 377                 return err;
 378
 379         /* driver should have reported the disassoc */
 380         WARN_ON(wdev->current_bss);
 381         return 0;
 382 }
 383
 384 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 385                         struct net_device *dev)
 386 {
 387         struct wireless_dev *wdev = dev->ieee80211_ptr;
 388         u8 bssid[ETH_ALEN];
 389
 390         ASSERT_WDEV_LOCK(wdev);
 391
 392         if (!rdev->ops->deauth)
 393                 return;
 394
 395         if (!wdev->current_bss)
 396                 return;
 397
 398         memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
 399         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 400                              WLAN_REASON_DEAUTH_LEAVING, false);
 401 }
 402
 403 struct cfg80211_mgmt_registration {
 404         struct list_head list;
 405         struct wireless_dev *wdev;
 406
 407         u32 nlportid;
 408
 409         int match_len;
 410
 411         __le16 frame_type;
 412
 413         u8 match[];
 414 };
 415
 416 static void
 417 cfg80211_process_mlme_unregistrations(struct cfg80211_registered_device *rdev)
 418 {
 419         struct cfg80211_mgmt_registration *reg;
 420
 421         ASSERT_RTNL();
 422
 423         spin_lock_bh(&rdev->mlme_unreg_lock);
 424         while ((reg = list_first_entry_or_null(&rdev->mlme_unreg,
 425                                                struct cfg80211_mgmt_registration,
 426                                                list))) {
 427                 list_del(&reg->list);
 428                 spin_unlock_bh(&rdev->mlme_unreg_lock);
 429
 430                 if (rdev->ops->mgmt_frame_register) {
 431                         u16 frame_type = le16_to_cpu(reg->frame_type);
 432
 433                         rdev_mgmt_frame_register(rdev, reg->wdev,
 434                                                  frame_type, false);
 435                 }
 436
 437                 kfree(reg);
 438
 439                 spin_lock_bh(&rdev->mlme_unreg_lock);
 440         }
 441         spin_unlock_bh(&rdev->mlme_unreg_lock);
 442 }
 443
 444 void cfg80211_mlme_unreg_wk(struct work_struct *wk)
 445 {
 446         struct cfg80211_registered_device *rdev;
 447
 448         rdev = container_of(wk, struct cfg80211_registered_device,
 449                             mlme_unreg_wk);
 450
 451         rtnl_lock();
 452         cfg80211_process_mlme_unregistrations(rdev);
 453         rtnl_unlock();
 454 }
 455
 456 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
 457                                 u16 frame_type, const u8 *match_data,
 458                                 int match_len)
 459 {
 460         struct wiphy *wiphy = wdev->wiphy;
 461         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 462         struct cfg80211_mgmt_registration *reg, *nreg;
 463         int err = 0;
 464         u16 mgmt_type;
 465
 466         if (!wdev->wiphy->mgmt_stypes)
 467                 return -EOPNOTSUPP;
 468
 469         if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
 470                 return -EINVAL;
 471
 472         if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 473                 return -EINVAL;
 474
 475         mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
 476         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
 477                 return -EINVAL;
 478
 479         nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
 480         if (!nreg)
 481                 return -ENOMEM;
 482
 483         spin_lock_bh(&wdev->mgmt_registrations_lock);
 484
 485         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 486                 int mlen = min(match_len, reg->match_len);
 487
 488                 if (frame_type != le16_to_cpu(reg->frame_type))
 489                         continue;
 490
 491                 if (memcmp(reg->match, match_data, mlen) == 0) {
 492                         err = -EALREADY;
 493                         break;
 494                 }
 495         }
 496
 497         if (err) {
 498                 kfree(nreg);
 499                 goto out;
 500         }
 501
 502         memcpy(nreg->match, match_data, match_len);
 503         nreg->match_len = match_len;
 504         nreg->nlportid = snd_portid;
 505         nreg->frame_type = cpu_to_le16(frame_type);
 506         nreg->wdev = wdev;
 507         list_add(&nreg->list, &wdev->mgmt_registrations);
 508         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 509
 510         /* process all unregistrations to avoid driver confusion */
 511         cfg80211_process_mlme_unregistrations(rdev);
 512
 513         if (rdev->ops->mgmt_frame_register)
 514                 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
 515
 516         return 0;
 517
 518  out:
 519         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 520
 521         return err;
 522 }
 523
 524 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
 525 {
 526         struct wiphy *wiphy = wdev->wiphy;
 527         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 528         struct cfg80211_mgmt_registration *reg, *tmp;
 529
 530         spin_lock_bh(&wdev->mgmt_registrations_lock);
 531
 532         list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
 533                 if (reg->nlportid != nlportid)
 534                         continue;
 535
 536                 list_del(&reg->list);
 537                 spin_lock(&rdev->mlme_unreg_lock);
 538                 list_add_tail(&reg->list, &rdev->mlme_unreg);
 539                 spin_unlock(&rdev->mlme_unreg_lock);
 540
 541                 schedule_work(&rdev->mlme_unreg_wk);
 542         }
 543
 544         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 545
 546         if (nlportid && rdev->crit_proto_nlportid == nlportid) {
 547                 rdev->crit_proto_nlportid = 0;
 548                 rdev_crit_proto_stop(rdev, wdev);
 549         }
 550
 551         if (nlportid == wdev->ap_unexpected_nlportid)
 552                 wdev->ap_unexpected_nlportid = 0;
 553 }
 554
 555 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
 556 {
 557         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 558
 559         spin_lock_bh(&wdev->mgmt_registrations_lock);
 560         spin_lock(&rdev->mlme_unreg_lock);
 561         list_splice_tail_init(&wdev->mgmt_registrations, &rdev->mlme_unreg);
 562         spin_unlock(&rdev->mlme_unreg_lock);
 563         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 564
 565         cfg80211_process_mlme_unregistrations(rdev);
 566 }
 567
 568 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 569                           struct wireless_dev *wdev,
 570                           struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 571 {
 572         const struct ieee80211_mgmt *mgmt;
 573         u16 stype;
 574
 575         if (!wdev->wiphy->mgmt_stypes)
 576                 return -EOPNOTSUPP;
 577
 578         if (!rdev->ops->mgmt_tx)
 579                 return -EOPNOTSUPP;
 580
 581         if (params->len < 24 + 1)
 582                 return -EINVAL;
 583
 584         mgmt = (const struct ieee80211_mgmt *)params->buf;
 585
 586         if (!ieee80211_is_mgmt(mgmt->frame_control))
 587                 return -EINVAL;
 588
 589         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 590         if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
 591                 return -EINVAL;
 592
 593         if (ieee80211_is_action(mgmt->frame_control) &&
 594             mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
 595                 int err = 0;
 596
 597                 wdev_lock(wdev);
 598
 599                 switch (wdev->iftype) {
 600                 case NL80211_IFTYPE_ADHOC:
 601                 case NL80211_IFTYPE_STATION:
 602                 case NL80211_IFTYPE_P2P_CLIENT:
 603                         if (!wdev->current_bss) {
 604                                 err = -ENOTCONN;
 605                                 break;
 606                         }
 607
 608                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 609                                               mgmt->bssid)) {
 610                                 err = -ENOTCONN;
 611                                 break;
 612                         }
 613
 614                         /*
 615                          * check for IBSS DA must be done by driver as
 616                          * cfg80211 doesn't track the stations
 617                          */
 618                         if (wdev->iftype == NL80211_IFTYPE_ADHOC)
 619                                 break;
 620
 621                         /* for station, check that DA is the AP */
 622                         if (!ether_addr_equal(wdev->current_bss->pub.bssid,
 623                                               mgmt->da)) {
 624                                 err = -ENOTCONN;
 625                                 break;
 626                         }
 627                         break;
 628                 case NL80211_IFTYPE_AP:
 629                 case NL80211_IFTYPE_P2P_GO:
 630                 case NL80211_IFTYPE_AP_VLAN:
 631                         if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
 632                                 err = -EINVAL;
 633                         break;
 634                 case NL80211_IFTYPE_MESH_POINT:
 635                         if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
 636                                 err = -EINVAL;
 637                                 break;
 638                         }
 639                         /*
 640                          * check for mesh DA must be done by driver as
 641                          * cfg80211 doesn't track the stations
 642                          */
 643                         break;
 644                 case NL80211_IFTYPE_P2P_DEVICE:
 645                         /*
 646                          * fall through, P2P device only supports
 647                          * public action frames
 648                          */
 649                 case NL80211_IFTYPE_NAN:
 650                 default:
 651                         err = -EOPNOTSUPP;
 652                         break;
 653                 }
 654                 wdev_unlock(wdev);
 655
 656                 if (err)
 657                         return err;
 658         }
 659
 660         if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
 661                 return -EINVAL;
 662
 663         /* Transmit the Action frame as requested by user space */
 664         return rdev_mgmt_tx(rdev, wdev, params, cookie);
 665 }
 666
 667 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
 668                       const u8 *buf, size_t len, u32 flags)
 669 {
 670         struct wiphy *wiphy = wdev->wiphy;
 671         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 672         struct cfg80211_mgmt_registration *reg;
 673         const struct ieee80211_txrx_stypes *stypes =
 674                 &wiphy->mgmt_stypes[wdev->iftype];
 675         struct ieee80211_mgmt *mgmt = (void *)buf;
 676         const u8 *data;
 677         int data_len;
 678         bool result = false;
 679         __le16 ftype = mgmt->frame_control &
 680                 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
 681         u16 stype;
 682
 683         trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
 684         stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
 685
 686         if (!(stypes->rx & BIT(stype))) {
 687                 trace_cfg80211_return_bool(false);
 688                 return false;
 689         }
 690
 691         data = buf + ieee80211_hdrlen(mgmt->frame_control);
 692         data_len = len - ieee80211_hdrlen(mgmt->frame_control);
 693
 694         spin_lock_bh(&wdev->mgmt_registrations_lock);
 695
 696         list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 697                 if (reg->frame_type != ftype)
 698                         continue;
 699
 700                 if (reg->match_len > data_len)
 701                         continue;
 702
 703                 if (memcmp(reg->match, data, reg->match_len))
 704                         continue;
 705
 706                 /* found match! */
 707
 708                 /* Indicate the received Action frame to user space */
 709                 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
 710                                       freq, sig_mbm,
 711                                       buf, len, flags, GFP_ATOMIC))
 712                         continue;
 713
 714                 result = true;
 715                 break;
 716         }
 717
 718         spin_unlock_bh(&wdev->mgmt_registrations_lock);
 719
 720         trace_cfg80211_return_bool(result);
 721         return result;
 722 }
 723 EXPORT_SYMBOL(cfg80211_rx_mgmt);
 724
 725 void cfg80211_dfs_channels_update_work(struct work_struct *work)
 726 {
 727         struct delayed_work *delayed_work = to_delayed_work(work);
 728         struct cfg80211_registered_device *rdev;
 729         struct cfg80211_chan_def chandef;
 730         struct ieee80211_supported_band *sband;
 731         struct ieee80211_channel *c;
 732         struct wiphy *wiphy;
 733         bool check_again = false;
 734         unsigned long timeout, next_time = 0;
 735         int bandid, i;
 736
 737         rdev = container_of(delayed_work, struct cfg80211_registered_device,
 738                             dfs_update_channels_wk);
 739         wiphy = &rdev->wiphy;
 740
 741         rtnl_lock();
 742         for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
 743                 sband = wiphy->bands[bandid];
 744                 if (!sband)
 745                         continue;
 746
 747                 for (i = 0; i < sband->n_channels; i++) {
 748                         c = &sband->channels[i];
 749
 750                         if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
 751                                 continue;
 752
 753                         timeout = c->dfs_state_entered + msecs_to_jiffies(
 754                                         IEEE80211_DFS_MIN_NOP_TIME_MS);
 755
 756                         if (time_after_eq(jiffies, timeout)) {
 757                                 c->dfs_state = NL80211_DFS_USABLE;
 758                                 c->dfs_state_entered = jiffies;
 759
 760                                 cfg80211_chandef_create(&chandef, c,
 761                                                         NL80211_CHAN_NO_HT);
 762
 763                                 nl80211_radar_notify(rdev, &chandef,
 764                                                      NL80211_RADAR_NOP_FINISHED,
 765                                                      NULL, GFP_ATOMIC);
 766                                 continue;
 767                         }
 768
 769                         if (!check_again)
 770                                 next_time = timeout - jiffies;
 771                         else
 772                                 next_time = min(next_time, timeout - jiffies);
 773                         check_again = true;
 774                 }
 775         }
 776         rtnl_unlock();
 777
 778         /* reschedule if there are other channels waiting to be cleared again */
 779         if (check_again)
 780                 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 781                                    next_time);
 782 }
 783
 784
 785 void cfg80211_radar_event(struct wiphy *wiphy,
 786                           struct cfg80211_chan_def *chandef,
 787                           gfp_t gfp)
 788 {
 789         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 790         unsigned long timeout;
 791
 792         trace_cfg80211_radar_event(wiphy, chandef);
 793
 794         /* only set the chandef supplied channel to unavailable, in
 795          * case the radar is detected on only one of multiple channels
 796          * spanned by the chandef.
 797          */
 798         cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
 799
 800         timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
 801         queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
 802                            timeout);
 803
 804         nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
 805 }
 806 EXPORT_SYMBOL(cfg80211_radar_event);
 807
 808 void cfg80211_cac_event(struct net_device *netdev,
 809                         const struct cfg80211_chan_def *chandef,
 810                         enum nl80211_radar_event event, gfp_t gfp)
 811 {
 812         struct wireless_dev *wdev = netdev->ieee80211_ptr;
 813         struct wiphy *wiphy = wdev->wiphy;
 814         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 815         unsigned long timeout;
 816
 817         trace_cfg80211_cac_event(netdev, event);
 818
 819         if (WARN_ON(!wdev->cac_started))
 820                 return;
 821
 822         if (WARN_ON(!wdev->chandef.chan))
 823                 return;
 824
 825         switch (event) {
 826         case NL80211_RADAR_CAC_FINISHED:
 827                 timeout = wdev->cac_start_time +
 828                           msecs_to_jiffies(wdev->cac_time_ms);
 829                 WARN_ON(!time_after_eq(jiffies, timeout));
 830                 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 831                 break;
 832         case NL80211_RADAR_CAC_ABORTED:
 833                 break;
 834         default:
 835                 WARN_ON(1);
 836                 return;
 837         }
 838         wdev->cac_started = false;
 839
 840         nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 841 }
 842 EXPORT_SYMBOL(cfg80211_cac_event);