1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IBSS mode implementation 4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 5 * Copyright 2004, Instant802 Networks, Inc. 6 * Copyright 2005, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 10 * Copyright 2013-2014 Intel Mobile Communications GmbH 11 * Copyright(c) 2016 Intel Deutschland GmbH 12 * Copyright(c) 2018-2026 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 55 /* Build IBSS probe response */ 56 frame_len = sizeof(struct ieee80211_hdr_3addr) + 57 12 /* struct ieee80211_mgmt.u.beacon */ + 58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 59 2 + 8 /* max Supported Rates */ + 60 3 /* max DS params */ + 61 4 /* IBSS params */ + 62 5 /* Channel Switch Announcement */ + 63 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 64 2 + sizeof(struct ieee80211_ht_cap) + 65 2 + sizeof(struct ieee80211_ht_operation) + 66 2 + sizeof(struct ieee80211_vht_cap) + 67 2 + sizeof(struct ieee80211_vht_operation) + 68 ifibss->ie_len; 69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 70 if (!presp) 71 return NULL; 72 73 presp->head = (void *)(presp + 1); 74 75 mgmt = (void *) presp->head; 76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 77 IEEE80211_STYPE_PROBE_RESP); 78 eth_broadcast_addr(mgmt->da); 79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 83 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 84 85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 86 87 *pos++ = WLAN_EID_SSID; 88 *pos++ = ifibss->ssid_len; 89 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 90 pos += ifibss->ssid_len; 91 92 sband = local->hw.wiphy->bands[chandef->chan->band]; 93 rates_n = 0; 94 if (have_higher_than_11mbit) 95 *have_higher_than_11mbit = false; 96 97 for (i = 0; i < sband->n_bitrates; i++) { 98 if (sband->bitrates[i].bitrate > 110 && 99 have_higher_than_11mbit) 100 *have_higher_than_11mbit = true; 101 102 rates |= BIT(i); 103 rates_n++; 104 } 105 106 *pos++ = WLAN_EID_SUPP_RATES; 107 *pos++ = min_t(int, 8, rates_n); 108 for (ri = 0; ri < sband->n_bitrates; ri++) { 109 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 110 u8 basic = 0; 111 if (!(rates & BIT(ri))) 112 continue; 113 114 if (basic_rates & BIT(ri)) 115 basic = 0x80; 116 *pos++ = basic | (u8) rate; 117 if (++rates_added == 8) { 118 ri++; /* continue at next rate for EXT_SUPP_RATES */ 119 break; 120 } 121 } 122 123 if (sband->band == NL80211_BAND_2GHZ) { 124 *pos++ = WLAN_EID_DS_PARAMS; 125 *pos++ = 1; 126 *pos++ = ieee80211_frequency_to_channel( 127 chandef->chan->center_freq); 128 } 129 130 *pos++ = WLAN_EID_IBSS_PARAMS; 131 *pos++ = 2; 132 /* FIX: set ATIM window based on scan results */ 133 *pos++ = 0; 134 *pos++ = 0; 135 136 if (csa_settings) { 137 *pos++ = WLAN_EID_CHANNEL_SWITCH; 138 *pos++ = 3; 139 *pos++ = csa_settings->block_tx ? 1 : 0; 140 *pos++ = ieee80211_frequency_to_channel( 141 csa_settings->chandef.chan->center_freq); 142 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 143 *pos++ = csa_settings->count; 144 presp->cntdwn_current_counter = csa_settings->count; 145 } 146 147 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 148 if (rates_n > 8) { 149 *pos++ = WLAN_EID_EXT_SUPP_RATES; 150 *pos++ = rates_n - 8; 151 for (; ri < sband->n_bitrates; ri++) { 152 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 153 u8 basic = 0; 154 if (!(rates & BIT(ri))) 155 continue; 156 157 if (basic_rates & BIT(ri)) 158 basic = 0x80; 159 *pos++ = basic | (u8) rate; 160 } 161 } 162 163 if (ifibss->ie_len) { 164 memcpy(pos, ifibss->ie, ifibss->ie_len); 165 pos += ifibss->ie_len; 166 } 167 168 /* add HT capability and information IEs */ 169 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 170 sband->ht_cap.ht_supported) { 171 struct ieee80211_sta_ht_cap ht_cap; 172 173 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 174 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 175 176 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 177 /* 178 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 179 * field and RIFS Mode are reserved in IBSS mode, therefore 180 * keep them at 0 181 */ 182 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 183 chandef, 0, false); 184 185 /* add VHT capability and information IEs */ 186 if (chandef->width != NL80211_CHAN_WIDTH_20 && 187 chandef->width != NL80211_CHAN_WIDTH_40 && 188 sband->vht_cap.vht_supported) { 189 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 190 sband->vht_cap.cap); 191 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 192 chandef); 193 } 194 } 195 196 if (local->hw.queues >= IEEE80211_NUM_ACS) 197 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 198 199 presp->head_len = pos - presp->head; 200 if (WARN_ON(presp->head_len > frame_len)) 201 goto error; 202 203 return presp; 204 error: 205 kfree(presp); 206 return NULL; 207 } 208 209 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 210 const u8 *bssid, const int beacon_int, 211 struct cfg80211_chan_def *req_chandef, 212 const u32 basic_rates, 213 const u16 capability, u64 tsf, 214 bool creator) 215 { 216 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 217 struct ieee80211_local *local = sdata->local; 218 struct ieee80211_mgmt *mgmt; 219 struct cfg80211_bss *bss; 220 u64 bss_change; 221 struct ieee80211_chan_req chanreq = {}; 222 struct ieee80211_channel *chan; 223 struct beacon_data *presp; 224 struct cfg80211_inform_bss bss_meta = {}; 225 bool have_higher_than_11mbit; 226 bool radar_required; 227 int err; 228 229 lockdep_assert_wiphy(local->hw.wiphy); 230 231 /* Reset own TSF to allow time synchronization work. */ 232 drv_reset_tsf(local, sdata); 233 234 if (!ether_addr_equal(ifibss->bssid, bssid)) 235 sta_info_flush(sdata, -1); 236 237 /* if merging, indicate to driver that we leave the old IBSS */ 238 if (sdata->vif.cfg.ibss_joined) { 239 sdata->vif.cfg.ibss_joined = false; 240 sdata->vif.cfg.ibss_creator = false; 241 sdata->vif.bss_conf.enable_beacon = false; 242 netif_carrier_off(sdata->dev); 243 synchronize_net(); 244 ieee80211_bss_info_change_notify(sdata, 245 BSS_CHANGED_IBSS | 246 BSS_CHANGED_BEACON_ENABLED); 247 drv_leave_ibss(local, sdata); 248 } 249 250 presp = sdata_dereference(ifibss->presp, sdata); 251 RCU_INIT_POINTER(ifibss->presp, NULL); 252 if (presp) 253 kfree_rcu(presp, rcu_head); 254 255 /* make a copy of the chandef, it could be modified below. */ 256 chanreq.oper = *req_chandef; 257 chan = chanreq.oper.chan; 258 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 259 NL80211_IFTYPE_ADHOC)) { 260 if (chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT || 261 chanreq.oper.width == NL80211_CHAN_WIDTH_20) { 262 sdata_info(sdata, 263 "Failed to join IBSS, beacons forbidden\n"); 264 return; 265 } 266 chanreq.oper.width = NL80211_CHAN_WIDTH_20; 267 chanreq.oper.center_freq1 = chan->center_freq; 268 /* check again for downgraded chandef */ 269 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 270 NL80211_IFTYPE_ADHOC)) { 271 sdata_info(sdata, 272 "Failed to join IBSS, beacons forbidden\n"); 273 return; 274 } 275 } 276 277 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 278 &chanreq.oper, NL80211_IFTYPE_ADHOC); 279 if (err < 0) { 280 sdata_info(sdata, 281 "Failed to join IBSS, invalid chandef\n"); 282 return; 283 } 284 if (err > 0 && !ifibss->userspace_handles_dfs) { 285 sdata_info(sdata, 286 "Failed to join IBSS, DFS channel without control program\n"); 287 return; 288 } 289 290 radar_required = err; 291 292 if (ieee80211_link_use_channel(&sdata->deflink, &chanreq, 293 ifibss->fixed_channel ? 294 IEEE80211_CHANCTX_SHARED : 295 IEEE80211_CHANCTX_EXCLUSIVE)) { 296 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 297 return; 298 } 299 sdata->deflink.radar_required = radar_required; 300 301 memcpy(ifibss->bssid, bssid, ETH_ALEN); 302 303 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 304 capability, tsf, &chanreq.oper, 305 &have_higher_than_11mbit, NULL); 306 if (!presp) 307 return; 308 309 rcu_assign_pointer(ifibss->presp, presp); 310 mgmt = (void *)presp->head; 311 312 sdata->vif.bss_conf.enable_beacon = true; 313 sdata->vif.bss_conf.beacon_int = beacon_int; 314 sdata->vif.bss_conf.basic_rates = basic_rates; 315 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 316 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 317 bss_change = BSS_CHANGED_BEACON_INT; 318 bss_change |= ieee80211_reset_erp_info(sdata); 319 bss_change |= BSS_CHANGED_BSSID; 320 bss_change |= BSS_CHANGED_BEACON; 321 bss_change |= BSS_CHANGED_BEACON_ENABLED; 322 bss_change |= BSS_CHANGED_BASIC_RATES; 323 bss_change |= BSS_CHANGED_HT; 324 bss_change |= BSS_CHANGED_IBSS; 325 bss_change |= BSS_CHANGED_SSID; 326 327 /* 328 * In 5 GHz/802.11a, we can always use short slot time. 329 * (IEEE 802.11-2012 18.3.8.7) 330 * 331 * In 2.4GHz, we must always use long slots in IBSS for compatibility 332 * reasons. 333 * (IEEE 802.11-2012 19.4.5) 334 * 335 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 336 */ 337 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 338 bss_change |= BSS_CHANGED_ERP_SLOT; 339 340 /* cf. IEEE 802.11 9.2.12 */ 341 sdata->deflink.operating_11g_mode = 342 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 343 344 ieee80211_set_wmm_default(&sdata->deflink, true, false); 345 346 sdata->vif.cfg.ibss_joined = true; 347 sdata->vif.cfg.ibss_creator = creator; 348 349 err = drv_join_ibss(local, sdata); 350 if (err) { 351 sdata->vif.cfg.ibss_joined = false; 352 sdata->vif.cfg.ibss_creator = false; 353 sdata->vif.bss_conf.enable_beacon = false; 354 sdata->vif.cfg.ssid_len = 0; 355 RCU_INIT_POINTER(ifibss->presp, NULL); 356 kfree_rcu(presp, rcu_head); 357 ieee80211_link_release_channel(&sdata->deflink); 358 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 359 err); 360 return; 361 } 362 363 ieee80211_bss_info_change_notify(sdata, bss_change); 364 365 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 366 mod_timer(&ifibss->timer, 367 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 368 369 bss_meta.chan = chan; 370 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 371 presp->head_len, GFP_KERNEL); 372 373 cfg80211_put_bss(local->hw.wiphy, bss); 374 netif_carrier_on(sdata->dev); 375 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 376 } 377 378 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 379 struct ieee80211_bss *bss) 380 { 381 struct cfg80211_bss *cbss = 382 container_of((void *)bss, struct cfg80211_bss, priv); 383 struct ieee80211_supported_band *sband; 384 struct cfg80211_chan_def chandef; 385 u32 basic_rates; 386 int i, j; 387 u16 beacon_int = cbss->beacon_interval; 388 const struct cfg80211_bss_ies *ies; 389 enum nl80211_channel_type chan_type; 390 u64 tsf; 391 392 lockdep_assert_wiphy(sdata->local->hw.wiphy); 393 394 if (beacon_int < 10) 395 beacon_int = 10; 396 397 switch (sdata->u.ibss.chandef.width) { 398 case NL80211_CHAN_WIDTH_20_NOHT: 399 case NL80211_CHAN_WIDTH_20: 400 case NL80211_CHAN_WIDTH_40: 401 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 402 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 403 break; 404 case NL80211_CHAN_WIDTH_80: 405 case NL80211_CHAN_WIDTH_80P80: 406 case NL80211_CHAN_WIDTH_160: 407 chandef = sdata->u.ibss.chandef; 408 chandef.chan = cbss->channel; 409 break; 410 default: 411 /* fall back to 20 MHz for unsupported modes */ 412 cfg80211_chandef_create(&chandef, cbss->channel, 413 NL80211_CHAN_NO_HT); 414 break; 415 } 416 417 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 418 419 basic_rates = 0; 420 421 for (i = 0; i < bss->supp_rates_len; i++) { 422 int rate = bss->supp_rates[i] & 0x7f; 423 bool is_basic = !!(bss->supp_rates[i] & 0x80); 424 425 for (j = 0; j < sband->n_bitrates; j++) { 426 int brate; 427 428 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5); 429 if (brate == rate) { 430 if (is_basic) 431 basic_rates |= BIT(j); 432 break; 433 } 434 } 435 } 436 437 rcu_read_lock(); 438 ies = rcu_dereference(cbss->ies); 439 tsf = ies->tsf; 440 rcu_read_unlock(); 441 442 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 443 beacon_int, 444 &chandef, 445 basic_rates, 446 cbss->capability, 447 tsf, false); 448 } 449 450 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 451 struct cfg80211_csa_settings *csa_settings, 452 u64 *changed) 453 { 454 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 455 struct beacon_data *presp, *old_presp; 456 struct cfg80211_bss *cbss; 457 const struct cfg80211_bss_ies *ies; 458 u16 capability = WLAN_CAPABILITY_IBSS; 459 u64 tsf; 460 461 lockdep_assert_wiphy(sdata->local->hw.wiphy); 462 463 if (ifibss->privacy) 464 capability |= WLAN_CAPABILITY_PRIVACY; 465 466 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 467 ifibss->bssid, ifibss->ssid, 468 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 469 IEEE80211_PRIVACY(ifibss->privacy)); 470 471 if (unlikely(!cbss)) 472 return -EINVAL; 473 474 rcu_read_lock(); 475 ies = rcu_dereference(cbss->ies); 476 tsf = ies->tsf; 477 rcu_read_unlock(); 478 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 479 480 old_presp = sdata_dereference(ifibss->presp, sdata); 481 482 presp = ieee80211_ibss_build_presp(sdata, 483 sdata->vif.bss_conf.beacon_int, 484 sdata->vif.bss_conf.basic_rates, 485 capability, tsf, &ifibss->chandef, 486 NULL, csa_settings); 487 if (!presp) 488 return -ENOMEM; 489 490 rcu_assign_pointer(ifibss->presp, presp); 491 if (old_presp) 492 kfree_rcu(old_presp, rcu_head); 493 494 *changed |= BSS_CHANGED_BEACON; 495 return 0; 496 } 497 498 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 499 { 500 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 501 struct cfg80211_bss *cbss; 502 503 lockdep_assert_wiphy(sdata->local->hw.wiphy); 504 505 /* When not connected/joined, sending CSA doesn't make sense. */ 506 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 507 return -ENOLINK; 508 509 /* update cfg80211 bss information with the new channel */ 510 if (!is_zero_ether_addr(ifibss->bssid)) { 511 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 512 ifibss->chandef.chan, 513 ifibss->bssid, ifibss->ssid, 514 ifibss->ssid_len, 515 IEEE80211_BSS_TYPE_IBSS, 516 IEEE80211_PRIVACY(ifibss->privacy)); 517 /* XXX: should not really modify cfg80211 data */ 518 if (cbss) { 519 cbss->channel = sdata->deflink.csa.chanreq.oper.chan; 520 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 521 } 522 } 523 524 ifibss->chandef = sdata->deflink.csa.chanreq.oper; 525 526 /* generate the beacon */ 527 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 528 } 529 530 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 531 { 532 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 533 534 wiphy_work_cancel(sdata->local->hw.wiphy, 535 &ifibss->csa_connection_drop_work); 536 } 537 538 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 539 __acquires(RCU) 540 { 541 struct ieee80211_sub_if_data *sdata = sta->sdata; 542 u8 addr[ETH_ALEN]; 543 544 memcpy(addr, sta->sta.addr, ETH_ALEN); 545 546 ieee80211_sta_init_nss_bw_capa(&sta->deflink, 547 &sdata->deflink.conf->chanreq.oper); 548 549 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 550 551 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 552 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 553 /* authorize the station only if the network is not RSN protected. If 554 * not wait for the userspace to authorize it */ 555 if (!sta->sdata->u.ibss.control_port) 556 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 557 558 rate_control_rate_init(&sta->deflink); 559 560 /* If it fails, maybe we raced another insertion? */ 561 if (sta_info_insert_rcu(sta)) 562 return sta_info_get(sdata, addr); 563 return sta; 564 } 565 566 static struct sta_info * 567 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 568 const u8 *addr, u32 supp_rates) 569 __acquires(RCU) 570 { 571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 572 struct ieee80211_local *local = sdata->local; 573 struct sta_info *sta; 574 struct ieee80211_chanctx_conf *chanctx_conf; 575 struct ieee80211_supported_band *sband; 576 int band; 577 578 /* 579 * XXX: Consider removing the least recently used entry and 580 * allow new one to be added. 581 */ 582 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 583 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 584 sdata->name, addr); 585 rcu_read_lock(); 586 return NULL; 587 } 588 589 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 590 rcu_read_lock(); 591 return NULL; 592 } 593 594 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 595 rcu_read_lock(); 596 return NULL; 597 } 598 599 rcu_read_lock(); 600 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 601 if (WARN_ON_ONCE(!chanctx_conf)) 602 return NULL; 603 band = chanctx_conf->def.chan->band; 604 rcu_read_unlock(); 605 606 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 607 if (!sta) { 608 rcu_read_lock(); 609 return NULL; 610 } 611 612 /* make sure mandatory rates are always added */ 613 sband = local->hw.wiphy->bands[band]; 614 sta->sta.deflink.supp_rates[band] = supp_rates | 615 ieee80211_mandatory_rates(sband); 616 617 return ieee80211_ibss_finish_sta(sta); 618 } 619 620 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 621 { 622 struct ieee80211_local *local = sdata->local; 623 int active = 0; 624 struct sta_info *sta; 625 626 lockdep_assert_wiphy(sdata->local->hw.wiphy); 627 628 rcu_read_lock(); 629 630 list_for_each_entry_rcu(sta, &local->sta_list, list) { 631 unsigned long last_active = ieee80211_sta_last_active(sta, -1); 632 633 if (sta->sdata == sdata && 634 time_is_after_jiffies(last_active + 635 IEEE80211_IBSS_MERGE_INTERVAL)) { 636 active++; 637 break; 638 } 639 } 640 641 rcu_read_unlock(); 642 643 return active; 644 } 645 646 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 647 { 648 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 649 struct ieee80211_local *local = sdata->local; 650 struct cfg80211_bss *cbss; 651 struct beacon_data *presp; 652 struct sta_info *sta; 653 654 lockdep_assert_wiphy(local->hw.wiphy); 655 656 if (!is_zero_ether_addr(ifibss->bssid)) { 657 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 658 ifibss->bssid, ifibss->ssid, 659 ifibss->ssid_len, 660 IEEE80211_BSS_TYPE_IBSS, 661 IEEE80211_PRIVACY(ifibss->privacy)); 662 663 if (cbss) { 664 cfg80211_unlink_bss(local->hw.wiphy, cbss); 665 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 666 } 667 } 668 669 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 670 671 sta_info_flush(sdata, -1); 672 673 spin_lock_bh(&ifibss->incomplete_lock); 674 while (!list_empty(&ifibss->incomplete_stations)) { 675 sta = list_first_entry(&ifibss->incomplete_stations, 676 struct sta_info, list); 677 list_del(&sta->list); 678 spin_unlock_bh(&ifibss->incomplete_lock); 679 680 sta_info_free(local, sta); 681 spin_lock_bh(&ifibss->incomplete_lock); 682 } 683 spin_unlock_bh(&ifibss->incomplete_lock); 684 685 netif_carrier_off(sdata->dev); 686 687 sdata->vif.cfg.ibss_joined = false; 688 sdata->vif.cfg.ibss_creator = false; 689 sdata->vif.bss_conf.enable_beacon = false; 690 sdata->vif.cfg.ssid_len = 0; 691 692 /* remove beacon */ 693 presp = sdata_dereference(ifibss->presp, sdata); 694 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 695 if (presp) 696 kfree_rcu(presp, rcu_head); 697 698 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 699 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 700 BSS_CHANGED_IBSS); 701 drv_leave_ibss(local, sdata); 702 ieee80211_link_release_channel(&sdata->deflink); 703 } 704 705 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 706 struct wiphy_work *work) 707 { 708 struct ieee80211_sub_if_data *sdata = 709 container_of(work, struct ieee80211_sub_if_data, 710 u.ibss.csa_connection_drop_work); 711 712 ieee80211_ibss_disconnect(sdata); 713 synchronize_rcu(); 714 skb_queue_purge(&sdata->skb_queue); 715 716 /* trigger a scan to find another IBSS network to join */ 717 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 718 } 719 720 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 721 { 722 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 723 int err; 724 725 /* if the current channel is a DFS channel, mark the channel as 726 * unavailable. 727 */ 728 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 729 &ifibss->chandef, 730 NL80211_IFTYPE_ADHOC); 731 if (err > 0) 732 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 733 GFP_ATOMIC); 734 } 735 736 static bool 737 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 738 struct ieee802_11_elems *elems, 739 bool beacon) 740 { 741 struct cfg80211_csa_settings params; 742 struct ieee80211_csa_ie csa_ie; 743 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 744 enum nl80211_channel_type ch_type; 745 int err; 746 struct ieee80211_conn_settings conn = { 747 .mode = IEEE80211_CONN_MODE_HT, 748 .bw_limit = IEEE80211_CONN_BW_LIMIT_40, 749 }; 750 u32 vht_cap_info = 0; 751 752 lockdep_assert_wiphy(sdata->local->hw.wiphy); 753 754 switch (ifibss->chandef.width) { 755 case NL80211_CHAN_WIDTH_20_NOHT: 756 conn.mode = IEEE80211_CONN_MODE_LEGACY; 757 fallthrough; 758 case NL80211_CHAN_WIDTH_20: 759 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20; 760 break; 761 default: 762 break; 763 } 764 765 if (elems->vht_cap_elem) 766 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 767 768 memset(¶ms, 0, sizeof(params)); 769 err = ieee80211_parse_ch_switch_ie(sdata, elems, 770 ifibss->chandef.chan->band, 771 vht_cap_info, &conn, 772 ifibss->bssid, false, 773 &csa_ie); 774 /* can't switch to destination channel, fail */ 775 if (err < 0) 776 goto disconnect; 777 778 /* did not contain a CSA */ 779 if (err) 780 return false; 781 782 /* channel switch is not supported, disconnect */ 783 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 784 goto disconnect; 785 786 params.count = csa_ie.count; 787 params.chandef = csa_ie.chanreq.oper; 788 789 switch (ifibss->chandef.width) { 790 case NL80211_CHAN_WIDTH_20_NOHT: 791 case NL80211_CHAN_WIDTH_20: 792 case NL80211_CHAN_WIDTH_40: 793 /* keep our current HT mode (HT20/HT40+/HT40-), even if 794 * another mode has been announced. The mode is not adopted 795 * within the beacon while doing CSA and we should therefore 796 * keep the mode which we announce. 797 */ 798 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 799 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 800 ch_type); 801 break; 802 default: 803 /* should not happen, conn_flags should prevent VHT modes. */ 804 WARN_ON(1); 805 goto disconnect; 806 } 807 808 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 809 NL80211_IFTYPE_ADHOC)) { 810 sdata_info(sdata, 811 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 812 ifibss->bssid, 813 params.chandef.chan->center_freq, 814 params.chandef.width, 815 params.chandef.center_freq1, 816 params.chandef.center_freq2); 817 goto disconnect; 818 } 819 820 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 821 ¶ms.chandef, 822 NL80211_IFTYPE_ADHOC); 823 if (err < 0) 824 goto disconnect; 825 if (err > 0 && !ifibss->userspace_handles_dfs) { 826 /* IBSS-DFS only allowed with a control program */ 827 goto disconnect; 828 } 829 830 params.radar_required = err; 831 832 if (cfg80211_chandef_identical(¶ms.chandef, 833 &sdata->vif.bss_conf.chanreq.oper)) { 834 ibss_dbg(sdata, 835 "received csa with an identical chandef, ignoring\n"); 836 return true; 837 } 838 839 /* all checks done, now perform the channel switch. */ 840 ibss_dbg(sdata, 841 "received channel switch announcement to go to channel %d MHz\n", 842 params.chandef.chan->center_freq); 843 844 params.block_tx = !!csa_ie.mode; 845 846 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 847 ¶ms)) 848 goto disconnect; 849 850 ieee80211_ibss_csa_mark_radar(sdata); 851 852 return true; 853 disconnect: 854 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 855 wiphy_work_queue(sdata->local->hw.wiphy, 856 &ifibss->csa_connection_drop_work); 857 858 ieee80211_ibss_csa_mark_radar(sdata); 859 860 return true; 861 } 862 863 static void 864 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 865 struct ieee80211_mgmt *mgmt, size_t len, 866 struct ieee80211_rx_status *rx_status, 867 struct ieee802_11_elems *elems) 868 { 869 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 870 return; 871 872 /* CSA is the only action we handle for now */ 873 if (mgmt->u.action.action_code != WLAN_ACTION_SPCT_CHL_SWITCH) 874 return; 875 876 if (!sdata->vif.bss_conf.csa_active) 877 ieee80211_ibss_process_chanswitch(sdata, elems, false); 878 } 879 880 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 881 struct ieee80211_mgmt *mgmt, 882 size_t len) 883 { 884 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 885 886 if (len < IEEE80211_DEAUTH_FRAME_LEN) 887 return; 888 889 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 890 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 891 sta_info_destroy_addr(sdata, mgmt->sa); 892 } 893 894 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 895 struct ieee80211_mgmt *mgmt, 896 size_t len) 897 { 898 u16 auth_alg, auth_transaction; 899 900 lockdep_assert_wiphy(sdata->local->hw.wiphy); 901 902 if (len < 24 + 6) 903 return; 904 905 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 906 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 907 908 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 909 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 910 mgmt->bssid, auth_transaction); 911 912 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 913 return; 914 915 /* 916 * IEEE 802.11 standard does not require authentication in IBSS 917 * networks and most implementations do not seem to use it. 918 * However, try to reply to authentication attempts if someone 919 * has actually implemented this. 920 */ 921 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 922 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 923 } 924 925 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 926 struct ieee80211_mgmt *mgmt, size_t len, 927 struct ieee80211_rx_status *rx_status, 928 struct ieee802_11_elems *elems, 929 struct ieee80211_channel *channel) 930 { 931 struct sta_info *sta; 932 enum nl80211_band band = rx_status->band; 933 struct ieee80211_local *local = sdata->local; 934 struct ieee80211_supported_band *sband; 935 bool rates_updated = false; 936 u32 supp_rates = 0; 937 938 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 939 return; 940 941 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 942 return; 943 944 sband = local->hw.wiphy->bands[band]; 945 if (WARN_ON(!sband)) 946 return; 947 948 rcu_read_lock(); 949 sta = sta_info_get(sdata, mgmt->sa); 950 951 if (elems->supp_rates) { 952 supp_rates = ieee80211_sta_get_rates(sdata, elems, 953 band, NULL); 954 if (sta) { 955 u32 prev_rates; 956 957 prev_rates = sta->sta.deflink.supp_rates[band]; 958 959 sta->sta.deflink.supp_rates[band] = supp_rates | 960 ieee80211_mandatory_rates(sband); 961 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 962 ibss_dbg(sdata, 963 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 964 sta->sta.addr, prev_rates, 965 sta->sta.deflink.supp_rates[band]); 966 rates_updated = true; 967 } 968 } else { 969 rcu_read_unlock(); 970 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 971 mgmt->sa, supp_rates); 972 } 973 } 974 975 if (sta && !sta->sta.wme && 976 (elems->wmm_info || elems->s1g_capab) && 977 local->hw.queues >= IEEE80211_NUM_ACS) { 978 sta->sta.wme = true; 979 ieee80211_check_fast_xmit(sta); 980 } 981 982 if (sta && elems->ht_operation && elems->ht_cap_elem && 983 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 984 /* we both use HT */ 985 struct ieee80211_ht_cap htcap_ie; 986 struct cfg80211_chan_def chandef; 987 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 988 989 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 990 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 991 992 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 993 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, 994 &sband->ht_cap, 995 &htcap_ie, 996 &sta->deflink); 997 998 if (elems->vht_operation && elems->vht_cap_elem && 999 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1000 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1001 /* we both use VHT */ 1002 struct ieee80211_vht_cap cap_ie; 1003 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1004 u32 vht_cap_info = 1005 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1006 1007 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1008 elems->vht_operation, 1009 elems->ht_operation, 1010 &chandef); 1011 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1012 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1013 &sband->vht_cap, 1014 &cap_ie, NULL, 1015 &sta->deflink); 1016 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1017 rates_updated |= true; 1018 } 1019 1020 if (bw != sta->sta.deflink.bandwidth) 1021 rates_updated |= true; 1022 1023 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1024 &chandef)) 1025 WARN_ON_ONCE(1); 1026 } 1027 1028 if (sta && rates_updated) { 1029 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1030 u8 rx_nss = sta->sta.deflink.rx_nss; 1031 1032 /* Force rx_nss recalculation */ 1033 sta->sta.deflink.rx_nss = 0; 1034 rate_control_rate_init(&sta->deflink); 1035 if (sta->sta.deflink.rx_nss != rx_nss) 1036 changed |= IEEE80211_RC_NSS_CHANGED; 1037 1038 drv_link_sta_rc_update(local, sdata, &sta->sta.deflink, 1039 changed); 1040 } 1041 1042 rcu_read_unlock(); 1043 } 1044 1045 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1046 struct ieee80211_mgmt *mgmt, size_t len, 1047 struct ieee80211_rx_status *rx_status, 1048 struct ieee802_11_elems *elems) 1049 { 1050 struct ieee80211_local *local = sdata->local; 1051 struct cfg80211_bss *cbss; 1052 struct ieee80211_bss *bss; 1053 struct ieee80211_channel *channel; 1054 u64 beacon_timestamp, rx_timestamp; 1055 u32 supp_rates = 0; 1056 enum nl80211_band band = rx_status->band; 1057 1058 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1059 if (!channel) 1060 return; 1061 1062 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1063 1064 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1065 if (!bss) 1066 return; 1067 1068 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1069 1070 /* same for beacon and probe response */ 1071 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1072 1073 /* check if we need to merge IBSS */ 1074 1075 /* not an IBSS */ 1076 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1077 goto put_bss; 1078 1079 /* different channel */ 1080 if (sdata->u.ibss.fixed_channel && 1081 sdata->u.ibss.chandef.chan != cbss->channel) 1082 goto put_bss; 1083 1084 /* different SSID */ 1085 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1086 memcmp(elems->ssid, sdata->u.ibss.ssid, 1087 sdata->u.ibss.ssid_len)) 1088 goto put_bss; 1089 1090 /* process channel switch */ 1091 if (sdata->vif.bss_conf.csa_active || 1092 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1093 goto put_bss; 1094 1095 /* same BSSID */ 1096 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1097 goto put_bss; 1098 1099 /* we use a fixed BSSID */ 1100 if (sdata->u.ibss.fixed_bssid) 1101 goto put_bss; 1102 1103 if (ieee80211_have_rx_timestamp(rx_status)) { 1104 /* time when timestamp field was received */ 1105 rx_timestamp = 1106 ieee80211_calculate_rx_timestamp(&local->hw, rx_status, 1107 len + FCS_LEN, 24); 1108 } else { 1109 /* 1110 * second best option: get current TSF 1111 * (will return -1 if not supported) 1112 */ 1113 rx_timestamp = drv_get_tsf(local, sdata); 1114 } 1115 1116 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1117 mgmt->sa, mgmt->bssid, 1118 (unsigned long long)rx_timestamp); 1119 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1120 (unsigned long long)beacon_timestamp, 1121 (unsigned long long)(rx_timestamp - beacon_timestamp), 1122 jiffies); 1123 1124 if (beacon_timestamp > rx_timestamp) { 1125 ibss_dbg(sdata, 1126 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1127 mgmt->bssid); 1128 ieee80211_sta_join_ibss(sdata, bss); 1129 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1130 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1131 supp_rates); 1132 rcu_read_unlock(); 1133 } 1134 1135 put_bss: 1136 ieee80211_rx_bss_put(local, bss); 1137 } 1138 1139 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1140 const u8 *bssid, const u8 *addr, 1141 u32 supp_rates) 1142 { 1143 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1144 struct ieee80211_local *local = sdata->local; 1145 struct sta_info *sta; 1146 struct ieee80211_chanctx_conf *chanctx_conf; 1147 struct ieee80211_supported_band *sband; 1148 int band; 1149 1150 /* 1151 * XXX: Consider removing the least recently used entry and 1152 * allow new one to be added. 1153 */ 1154 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1155 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1156 sdata->name, addr); 1157 return; 1158 } 1159 1160 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1161 return; 1162 1163 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1164 return; 1165 1166 rcu_read_lock(); 1167 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1168 if (WARN_ON_ONCE(!chanctx_conf)) { 1169 rcu_read_unlock(); 1170 return; 1171 } 1172 band = chanctx_conf->def.chan->band; 1173 rcu_read_unlock(); 1174 1175 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1176 if (!sta) 1177 return; 1178 1179 /* make sure mandatory rates are always added */ 1180 sband = local->hw.wiphy->bands[band]; 1181 sta->sta.deflink.supp_rates[band] = supp_rates | 1182 ieee80211_mandatory_rates(sband); 1183 1184 spin_lock(&ifibss->incomplete_lock); 1185 list_add(&sta->list, &ifibss->incomplete_stations); 1186 spin_unlock(&ifibss->incomplete_lock); 1187 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1188 } 1189 1190 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1191 { 1192 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1193 struct ieee80211_local *local = sdata->local; 1194 struct sta_info *sta, *tmp; 1195 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1196 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1197 1198 lockdep_assert_wiphy(local->hw.wiphy); 1199 1200 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1201 unsigned long last_active = ieee80211_sta_last_active(sta, -1); 1202 1203 if (sdata != sta->sdata) 1204 continue; 1205 1206 if (time_is_before_jiffies(last_active + exp_time) || 1207 (time_is_before_jiffies(last_active + exp_rsn) && 1208 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1209 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1210 1211 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1212 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1213 "not authorized " : "", sta->sta.addr); 1214 1215 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1216 ifibss->bssid, 1217 IEEE80211_STYPE_DEAUTH, 1218 WLAN_REASON_DEAUTH_LEAVING, 1219 true, frame_buf); 1220 WARN_ON(__sta_info_destroy(sta)); 1221 } 1222 } 1223 } 1224 1225 /* 1226 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1227 */ 1228 1229 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1230 { 1231 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1232 1233 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1234 1235 mod_timer(&ifibss->timer, 1236 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1237 1238 ieee80211_ibss_sta_expire(sdata); 1239 1240 if (time_before(jiffies, ifibss->last_scan_completed + 1241 IEEE80211_IBSS_MERGE_INTERVAL)) 1242 return; 1243 1244 if (ieee80211_sta_active_ibss(sdata)) 1245 return; 1246 1247 if (ifibss->fixed_channel) 1248 return; 1249 1250 sdata_info(sdata, 1251 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1252 1253 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1254 NULL, 0); 1255 } 1256 1257 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1258 { 1259 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1260 u8 bssid[ETH_ALEN]; 1261 u16 capability; 1262 int i; 1263 1264 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1265 1266 if (ifibss->fixed_bssid) { 1267 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1268 } else { 1269 /* Generate random, not broadcast, locally administered BSSID. Mix in 1270 * own MAC address to make sure that devices that do not have proper 1271 * random number generator get different BSSID. */ 1272 get_random_bytes(bssid, ETH_ALEN); 1273 for (i = 0; i < ETH_ALEN; i++) 1274 bssid[i] ^= sdata->vif.addr[i]; 1275 bssid[0] &= ~0x01; 1276 bssid[0] |= 0x02; 1277 } 1278 1279 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1280 1281 capability = WLAN_CAPABILITY_IBSS; 1282 1283 if (ifibss->privacy) 1284 capability |= WLAN_CAPABILITY_PRIVACY; 1285 1286 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1287 &ifibss->chandef, ifibss->basic_rates, 1288 capability, 0, true); 1289 } 1290 1291 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1292 struct ieee80211_channel **channels, 1293 unsigned int channels_max, 1294 u32 center_freq, u32 width) 1295 { 1296 struct ieee80211_channel *chan = NULL; 1297 unsigned int n_chan = 0; 1298 u32 start_freq, end_freq, freq; 1299 1300 if (width <= 20) { 1301 start_freq = center_freq; 1302 end_freq = center_freq; 1303 } else { 1304 start_freq = center_freq - width / 2 + 10; 1305 end_freq = center_freq + width / 2 - 10; 1306 } 1307 1308 for (freq = start_freq; freq <= end_freq; freq += 20) { 1309 chan = ieee80211_get_channel(wiphy, freq); 1310 if (!chan) 1311 continue; 1312 if (n_chan >= channels_max) 1313 return n_chan; 1314 1315 channels[n_chan] = chan; 1316 n_chan++; 1317 } 1318 1319 return n_chan; 1320 } 1321 1322 static unsigned int 1323 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1324 const struct cfg80211_chan_def *chandef, 1325 struct ieee80211_channel **channels, 1326 unsigned int channels_max) 1327 { 1328 unsigned int n_chan = 0; 1329 u32 width, cf1, cf2 = 0; 1330 1331 switch (chandef->width) { 1332 case NL80211_CHAN_WIDTH_40: 1333 width = 40; 1334 break; 1335 case NL80211_CHAN_WIDTH_80P80: 1336 cf2 = chandef->center_freq2; 1337 fallthrough; 1338 case NL80211_CHAN_WIDTH_80: 1339 width = 80; 1340 break; 1341 case NL80211_CHAN_WIDTH_160: 1342 width = 160; 1343 break; 1344 default: 1345 width = 20; 1346 break; 1347 } 1348 1349 cf1 = chandef->center_freq1; 1350 1351 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1352 1353 if (cf2) 1354 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1355 channels_max - n_chan, cf2, 1356 width); 1357 1358 return n_chan; 1359 } 1360 1361 /* 1362 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1363 */ 1364 1365 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1366 { 1367 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1368 struct ieee80211_local *local = sdata->local; 1369 struct cfg80211_bss *cbss; 1370 struct ieee80211_channel *chan = NULL; 1371 const u8 *bssid = NULL; 1372 int active_ibss; 1373 1374 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1375 1376 active_ibss = ieee80211_sta_active_ibss(sdata); 1377 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1378 1379 if (active_ibss) 1380 return; 1381 1382 if (ifibss->fixed_bssid) 1383 bssid = ifibss->bssid; 1384 if (ifibss->fixed_channel) 1385 chan = ifibss->chandef.chan; 1386 if (!is_zero_ether_addr(ifibss->bssid)) 1387 bssid = ifibss->bssid; 1388 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1389 ifibss->ssid, ifibss->ssid_len, 1390 IEEE80211_BSS_TYPE_IBSS, 1391 IEEE80211_PRIVACY(ifibss->privacy)); 1392 1393 if (cbss) { 1394 struct ieee80211_bss *bss; 1395 1396 bss = (void *)cbss->priv; 1397 ibss_dbg(sdata, 1398 "sta_find_ibss: selected %pM current %pM\n", 1399 cbss->bssid, ifibss->bssid); 1400 sdata_info(sdata, 1401 "Selected IBSS BSSID %pM based on configured SSID\n", 1402 cbss->bssid); 1403 1404 ieee80211_sta_join_ibss(sdata, bss); 1405 ieee80211_rx_bss_put(local, bss); 1406 return; 1407 } 1408 1409 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1410 * directly and do not waste time scanning 1411 */ 1412 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1413 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1414 bssid); 1415 ieee80211_sta_create_ibss(sdata); 1416 return; 1417 } 1418 1419 1420 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1421 1422 /* Selected IBSS not found in current scan results - try to scan */ 1423 if (time_after(jiffies, ifibss->last_scan_completed + 1424 IEEE80211_SCAN_INTERVAL)) { 1425 struct ieee80211_channel *channels[8]; 1426 unsigned int num; 1427 1428 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1429 1430 if (ifibss->fixed_channel) { 1431 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1432 &ifibss->chandef, 1433 channels, 1434 ARRAY_SIZE(channels)); 1435 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1436 ifibss->ssid_len, channels, 1437 num); 1438 } else { 1439 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1440 ifibss->ssid_len, NULL, 0); 1441 } 1442 } else { 1443 int interval = IEEE80211_SCAN_INTERVAL; 1444 1445 if (time_after(jiffies, ifibss->ibss_join_req + 1446 IEEE80211_IBSS_JOIN_TIMEOUT)) 1447 ieee80211_sta_create_ibss(sdata); 1448 1449 mod_timer(&ifibss->timer, 1450 round_jiffies(jiffies + interval)); 1451 } 1452 } 1453 1454 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1455 struct sk_buff *req) 1456 { 1457 struct ieee80211_mgmt *mgmt = (void *)req->data; 1458 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1459 struct ieee80211_local *local = sdata->local; 1460 int tx_last_beacon, len = req->len; 1461 struct sk_buff *skb; 1462 struct beacon_data *presp; 1463 u8 *pos, *end; 1464 1465 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1466 1467 presp = sdata_dereference(ifibss->presp, sdata); 1468 1469 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1470 len < 24 + 2 || !presp) 1471 return; 1472 1473 tx_last_beacon = drv_tx_last_beacon(local); 1474 1475 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1476 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1477 mgmt->bssid, tx_last_beacon); 1478 1479 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1480 return; 1481 1482 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1483 !is_broadcast_ether_addr(mgmt->bssid)) 1484 return; 1485 1486 end = ((u8 *) mgmt) + len; 1487 pos = mgmt->u.probe_req.variable; 1488 if (pos[0] != WLAN_EID_SSID || 1489 pos + 2 + pos[1] > end) { 1490 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1491 mgmt->sa); 1492 return; 1493 } 1494 if (pos[1] != 0 && 1495 (pos[1] != ifibss->ssid_len || 1496 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1497 /* Ignore ProbeReq for foreign SSID */ 1498 return; 1499 } 1500 1501 /* Reply with ProbeResp */ 1502 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1503 if (!skb) 1504 return; 1505 1506 skb_reserve(skb, local->tx_headroom); 1507 skb_put_data(skb, presp->head, presp->head_len); 1508 1509 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1510 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1511 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1512 1513 /* avoid excessive retries for probe request to wildcard SSIDs */ 1514 if (pos[1] == 0) 1515 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1516 1517 ieee80211_tx_skb(sdata, skb); 1518 } 1519 1520 static 1521 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1522 struct ieee80211_mgmt *mgmt, size_t len, 1523 struct ieee80211_rx_status *rx_status) 1524 { 1525 size_t baselen; 1526 struct ieee802_11_elems *elems; 1527 u16 type; 1528 1529 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1530 offsetof(typeof(mgmt->u.beacon), variable)); 1531 1532 /* 1533 * either beacon or probe_resp but the variable field is at the 1534 * same offset 1535 */ 1536 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1537 if (baselen > len) 1538 return; 1539 1540 type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE; 1541 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1542 len - baselen, type, NULL); 1543 1544 if (elems) { 1545 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1546 kfree(elems); 1547 } 1548 } 1549 1550 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1551 struct sk_buff *skb) 1552 { 1553 struct ieee80211_rx_status *rx_status; 1554 struct ieee80211_mgmt *mgmt; 1555 u16 fc; 1556 struct ieee802_11_elems *elems; 1557 int ies_len; 1558 1559 rx_status = IEEE80211_SKB_RXCB(skb); 1560 mgmt = (struct ieee80211_mgmt *) skb->data; 1561 fc = le16_to_cpu(mgmt->frame_control); 1562 1563 if (!sdata->u.ibss.ssid_len) 1564 return; /* not ready to merge yet */ 1565 1566 switch (fc & IEEE80211_FCTL_STYPE) { 1567 case IEEE80211_STYPE_PROBE_REQ: 1568 ieee80211_rx_mgmt_probe_req(sdata, skb); 1569 break; 1570 case IEEE80211_STYPE_PROBE_RESP: 1571 case IEEE80211_STYPE_BEACON: 1572 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1573 rx_status); 1574 break; 1575 case IEEE80211_STYPE_AUTH: 1576 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1577 break; 1578 case IEEE80211_STYPE_DEAUTH: 1579 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1580 break; 1581 case IEEE80211_STYPE_ACTION: 1582 switch (mgmt->u.action.category) { 1583 case WLAN_CATEGORY_SPECTRUM_MGMT: 1584 ies_len = skb->len - 1585 offsetof(struct ieee80211_mgmt, 1586 u.action.chan_switch.variable); 1587 1588 if (ies_len < 0) 1589 break; 1590 1591 elems = ieee802_11_parse_elems(mgmt->u.action.chan_switch.variable, 1592 ies_len, 1593 IEEE80211_FTYPE_MGMT | 1594 IEEE80211_STYPE_ACTION, 1595 NULL); 1596 1597 if (elems && !elems->parse_error) 1598 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1599 skb->len, 1600 rx_status, 1601 elems); 1602 kfree(elems); 1603 break; 1604 } 1605 } 1606 } 1607 1608 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1609 { 1610 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1611 struct sta_info *sta; 1612 1613 /* 1614 * Work could be scheduled after scan or similar 1615 * when we aren't even joined (or trying) with a 1616 * network. 1617 */ 1618 if (!ifibss->ssid_len) 1619 return; 1620 1621 spin_lock_bh(&ifibss->incomplete_lock); 1622 while (!list_empty(&ifibss->incomplete_stations)) { 1623 sta = list_first_entry(&ifibss->incomplete_stations, 1624 struct sta_info, list); 1625 list_del(&sta->list); 1626 spin_unlock_bh(&ifibss->incomplete_lock); 1627 1628 ieee80211_ibss_finish_sta(sta); 1629 rcu_read_unlock(); 1630 spin_lock_bh(&ifibss->incomplete_lock); 1631 } 1632 spin_unlock_bh(&ifibss->incomplete_lock); 1633 1634 switch (ifibss->state) { 1635 case IEEE80211_IBSS_MLME_SEARCH: 1636 ieee80211_sta_find_ibss(sdata); 1637 break; 1638 case IEEE80211_IBSS_MLME_JOINED: 1639 ieee80211_sta_merge_ibss(sdata); 1640 break; 1641 default: 1642 WARN_ON(1); 1643 break; 1644 } 1645 } 1646 1647 static void ieee80211_ibss_timer(struct timer_list *t) 1648 { 1649 struct ieee80211_sub_if_data *sdata = 1650 timer_container_of(sdata, t, u.ibss.timer); 1651 1652 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1653 } 1654 1655 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1656 { 1657 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1658 1659 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1660 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1661 spin_lock_init(&ifibss->incomplete_lock); 1662 wiphy_work_init(&ifibss->csa_connection_drop_work, 1663 ieee80211_csa_connection_drop_work); 1664 } 1665 1666 /* scan finished notification */ 1667 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1668 { 1669 struct ieee80211_sub_if_data *sdata; 1670 1671 lockdep_assert_wiphy(local->hw.wiphy); 1672 1673 list_for_each_entry(sdata, &local->interfaces, list) { 1674 if (!ieee80211_sdata_running(sdata)) 1675 continue; 1676 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1677 continue; 1678 sdata->u.ibss.last_scan_completed = jiffies; 1679 } 1680 } 1681 1682 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1683 struct cfg80211_ibss_params *params) 1684 { 1685 u64 changed = 0; 1686 enum ieee80211_chanctx_mode chanmode; 1687 struct ieee80211_local *local = sdata->local; 1688 int radar_detect_width = 0; 1689 int ret; 1690 1691 lockdep_assert_wiphy(local->hw.wiphy); 1692 1693 if (params->chandef.chan->freq_offset) { 1694 /* this may work, but is untested */ 1695 return -EOPNOTSUPP; 1696 } 1697 1698 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1699 ¶ms->chandef, 1700 sdata->wdev.iftype); 1701 if (ret < 0) 1702 return ret; 1703 1704 if (ret > 0) { 1705 if (!params->userspace_handles_dfs) 1706 return -EINVAL; 1707 radar_detect_width = BIT(params->chandef.width); 1708 } 1709 1710 chanmode = (params->channel_fixed && !ret) ? 1711 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1712 1713 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1714 radar_detect_width, -1); 1715 if (ret < 0) 1716 return ret; 1717 1718 if (params->bssid) { 1719 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1720 sdata->u.ibss.fixed_bssid = true; 1721 } else 1722 sdata->u.ibss.fixed_bssid = false; 1723 1724 sdata->u.ibss.privacy = params->privacy; 1725 sdata->u.ibss.control_port = params->control_port; 1726 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1727 sdata->u.ibss.basic_rates = params->basic_rates; 1728 sdata->u.ibss.last_scan_completed = jiffies; 1729 1730 /* fix basic_rates if channel does not support these rates */ 1731 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1732 sizeof(params->mcast_rate)); 1733 1734 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1735 1736 sdata->u.ibss.chandef = params->chandef; 1737 sdata->u.ibss.fixed_channel = params->channel_fixed; 1738 1739 if (params->ie) { 1740 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1741 GFP_KERNEL); 1742 if (sdata->u.ibss.ie) 1743 sdata->u.ibss.ie_len = params->ie_len; 1744 } 1745 1746 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1747 sdata->u.ibss.ibss_join_req = jiffies; 1748 1749 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1750 sdata->u.ibss.ssid_len = params->ssid_len; 1751 1752 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1753 sizeof(sdata->u.ibss.ht_capa)); 1754 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1755 sizeof(sdata->u.ibss.ht_capa_mask)); 1756 1757 /* 1758 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1759 * reserved, but an HT STA shall protect HT transmissions as though 1760 * the HT Protection field were set to non-HT mixed mode. 1761 * 1762 * In an IBSS, the RIFS Mode field of the HT Operation element is 1763 * also reserved, but an HT STA shall operate as though this field 1764 * were set to 1. 1765 */ 1766 1767 sdata->vif.bss_conf.ht_operation_mode |= 1768 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1769 | IEEE80211_HT_PARAM_RIFS_MODE; 1770 1771 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1772 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1773 1774 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1775 sdata->deflink.needed_rx_chains = local->rx_chains; 1776 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1777 1778 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1779 1780 return 0; 1781 } 1782 1783 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1784 { 1785 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1786 1787 ifibss->ssid_len = 0; 1788 ieee80211_ibss_disconnect(sdata); 1789 eth_zero_addr(ifibss->bssid); 1790 1791 /* remove beacon */ 1792 kfree(sdata->u.ibss.ie); 1793 sdata->u.ibss.ie = NULL; 1794 sdata->u.ibss.ie_len = 0; 1795 1796 /* on the next join, re-program HT parameters */ 1797 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1798 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1799 1800 synchronize_rcu(); 1801 1802 skb_queue_purge(&sdata->skb_queue); 1803 1804 timer_delete_sync(&sdata->u.ibss.timer); 1805 1806 return 0; 1807 } 1808