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 netif_carrier_off(sdata->dev); 672 if (!sta_info_flush(sdata, -1)) 673 synchronize_net(); 674 675 spin_lock_bh(&ifibss->incomplete_lock); 676 while (!list_empty(&ifibss->incomplete_stations)) { 677 sta = list_first_entry(&ifibss->incomplete_stations, 678 struct sta_info, list); 679 list_del(&sta->list); 680 spin_unlock_bh(&ifibss->incomplete_lock); 681 682 sta_info_free(local, sta); 683 spin_lock_bh(&ifibss->incomplete_lock); 684 } 685 spin_unlock_bh(&ifibss->incomplete_lock); 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 skb_queue_purge(&sdata->skb_queue); 714 715 /* trigger a scan to find another IBSS network to join */ 716 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 717 } 718 719 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 720 { 721 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 722 int err; 723 724 /* if the current channel is a DFS channel, mark the channel as 725 * unavailable. 726 */ 727 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 728 &ifibss->chandef, 729 NL80211_IFTYPE_ADHOC); 730 if (err > 0) 731 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 732 GFP_ATOMIC); 733 } 734 735 static bool 736 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 737 struct ieee802_11_elems *elems, 738 bool beacon) 739 { 740 struct cfg80211_csa_settings params; 741 struct ieee80211_csa_ie csa_ie; 742 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 743 enum nl80211_channel_type ch_type; 744 int err; 745 struct ieee80211_conn_settings conn = { 746 .mode = IEEE80211_CONN_MODE_HT, 747 .bw_limit = IEEE80211_CONN_BW_LIMIT_40, 748 }; 749 u32 vht_cap_info = 0; 750 751 lockdep_assert_wiphy(sdata->local->hw.wiphy); 752 753 switch (ifibss->chandef.width) { 754 case NL80211_CHAN_WIDTH_20_NOHT: 755 conn.mode = IEEE80211_CONN_MODE_LEGACY; 756 fallthrough; 757 case NL80211_CHAN_WIDTH_20: 758 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20; 759 break; 760 default: 761 break; 762 } 763 764 if (elems->vht_cap_elem) 765 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 766 767 memset(¶ms, 0, sizeof(params)); 768 err = ieee80211_parse_ch_switch_ie(sdata, elems, 769 ifibss->chandef.chan->band, 770 vht_cap_info, &conn, 771 ifibss->bssid, false, 772 &csa_ie); 773 /* can't switch to destination channel, fail */ 774 if (err < 0) 775 goto disconnect; 776 777 /* did not contain a CSA */ 778 if (err) 779 return false; 780 781 /* channel switch is not supported, disconnect */ 782 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 783 goto disconnect; 784 785 params.count = csa_ie.count; 786 params.chandef = csa_ie.chanreq.oper; 787 788 switch (ifibss->chandef.width) { 789 case NL80211_CHAN_WIDTH_20_NOHT: 790 case NL80211_CHAN_WIDTH_20: 791 case NL80211_CHAN_WIDTH_40: 792 /* keep our current HT mode (HT20/HT40+/HT40-), even if 793 * another mode has been announced. The mode is not adopted 794 * within the beacon while doing CSA and we should therefore 795 * keep the mode which we announce. 796 */ 797 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 798 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 799 ch_type); 800 break; 801 default: 802 /* should not happen, conn_flags should prevent VHT modes. */ 803 WARN_ON(1); 804 goto disconnect; 805 } 806 807 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 808 NL80211_IFTYPE_ADHOC)) { 809 sdata_info(sdata, 810 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 811 ifibss->bssid, 812 params.chandef.chan->center_freq, 813 params.chandef.width, 814 params.chandef.center_freq1, 815 params.chandef.center_freq2); 816 goto disconnect; 817 } 818 819 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 820 ¶ms.chandef, 821 NL80211_IFTYPE_ADHOC); 822 if (err < 0) 823 goto disconnect; 824 if (err > 0 && !ifibss->userspace_handles_dfs) { 825 /* IBSS-DFS only allowed with a control program */ 826 goto disconnect; 827 } 828 829 params.radar_required = err; 830 831 if (cfg80211_chandef_identical(¶ms.chandef, 832 &sdata->vif.bss_conf.chanreq.oper)) { 833 ibss_dbg(sdata, 834 "received csa with an identical chandef, ignoring\n"); 835 return true; 836 } 837 838 /* all checks done, now perform the channel switch. */ 839 ibss_dbg(sdata, 840 "received channel switch announcement to go to channel %d MHz\n", 841 params.chandef.chan->center_freq); 842 843 params.block_tx = !!csa_ie.mode; 844 845 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 846 ¶ms)) 847 goto disconnect; 848 849 ieee80211_ibss_csa_mark_radar(sdata); 850 851 return true; 852 disconnect: 853 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 854 wiphy_work_queue(sdata->local->hw.wiphy, 855 &ifibss->csa_connection_drop_work); 856 857 ieee80211_ibss_csa_mark_radar(sdata); 858 859 return true; 860 } 861 862 static void 863 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 864 struct ieee80211_mgmt *mgmt, size_t len, 865 struct ieee80211_rx_status *rx_status, 866 struct ieee802_11_elems *elems) 867 { 868 if (len < IEEE80211_MIN_ACTION_SIZE(chan_switch)) 869 return; 870 871 /* CSA is the only action we handle for now */ 872 if (mgmt->u.action.action_code != WLAN_ACTION_SPCT_CHL_SWITCH) 873 return; 874 875 if (!sdata->vif.bss_conf.csa_active) 876 ieee80211_ibss_process_chanswitch(sdata, elems, false); 877 } 878 879 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 880 struct ieee80211_mgmt *mgmt, 881 size_t len) 882 { 883 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 884 885 if (len < IEEE80211_DEAUTH_FRAME_LEN) 886 return; 887 888 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 889 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 890 sta_info_destroy_addr(sdata, mgmt->sa); 891 } 892 893 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 894 struct ieee80211_mgmt *mgmt, 895 size_t len) 896 { 897 u16 auth_alg, auth_transaction; 898 899 lockdep_assert_wiphy(sdata->local->hw.wiphy); 900 901 if (len < 24 + 6) 902 return; 903 904 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 905 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 906 907 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 908 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 909 mgmt->bssid, auth_transaction); 910 911 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 912 return; 913 914 /* 915 * IEEE 802.11 standard does not require authentication in IBSS 916 * networks and most implementations do not seem to use it. 917 * However, try to reply to authentication attempts if someone 918 * has actually implemented this. 919 */ 920 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 921 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 922 } 923 924 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 925 struct ieee80211_mgmt *mgmt, size_t len, 926 struct ieee80211_rx_status *rx_status, 927 struct ieee802_11_elems *elems, 928 struct ieee80211_channel *channel) 929 { 930 struct sta_info *sta; 931 enum nl80211_band band = rx_status->band; 932 struct ieee80211_local *local = sdata->local; 933 struct ieee80211_supported_band *sband; 934 bool rates_updated = false; 935 u32 supp_rates = 0; 936 937 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 938 return; 939 940 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 941 return; 942 943 sband = local->hw.wiphy->bands[band]; 944 if (WARN_ON(!sband)) 945 return; 946 947 rcu_read_lock(); 948 sta = sta_info_get(sdata, mgmt->sa); 949 950 if (elems->supp_rates) { 951 supp_rates = ieee80211_sta_get_rates(sdata, elems, 952 band, NULL); 953 if (sta) { 954 u32 prev_rates; 955 956 prev_rates = sta->sta.deflink.supp_rates[band]; 957 958 sta->sta.deflink.supp_rates[band] = supp_rates | 959 ieee80211_mandatory_rates(sband); 960 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 961 ibss_dbg(sdata, 962 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 963 sta->sta.addr, prev_rates, 964 sta->sta.deflink.supp_rates[band]); 965 rates_updated = true; 966 } 967 } else { 968 rcu_read_unlock(); 969 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 970 mgmt->sa, supp_rates); 971 } 972 } 973 974 if (sta && !sta->sta.wme && 975 (elems->wmm_info || elems->s1g_capab) && 976 local->hw.queues >= IEEE80211_NUM_ACS) { 977 sta->sta.wme = true; 978 ieee80211_check_fast_xmit(sta); 979 } 980 981 if (sta && elems->ht_operation && elems->ht_cap_elem && 982 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 983 /* we both use HT */ 984 struct ieee80211_ht_cap htcap_ie; 985 struct cfg80211_chan_def chandef; 986 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 987 988 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 989 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 990 991 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 992 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, 993 &sband->ht_cap, 994 &htcap_ie, 995 &sta->deflink); 996 997 if (elems->vht_operation && elems->vht_cap_elem && 998 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 999 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1000 /* we both use VHT */ 1001 struct ieee80211_vht_cap cap_ie; 1002 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1003 u32 vht_cap_info = 1004 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1005 1006 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1007 elems->vht_operation, 1008 elems->ht_operation, 1009 &chandef); 1010 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1011 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1012 &sband->vht_cap, 1013 &cap_ie, NULL, 1014 &sta->deflink); 1015 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1016 rates_updated |= true; 1017 } 1018 1019 if (bw != sta->sta.deflink.bandwidth) 1020 rates_updated |= true; 1021 1022 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1023 &chandef)) 1024 WARN_ON_ONCE(1); 1025 } 1026 1027 if (sta && rates_updated) { 1028 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1029 u8 rx_nss = sta->sta.deflink.rx_nss; 1030 1031 ieee80211_sta_init_nss_bw_capa(&sta->deflink, 1032 &sdata->deflink.conf->chanreq.oper); 1033 rate_control_rate_init(&sta->deflink); 1034 if (sta->sta.deflink.rx_nss != rx_nss) 1035 changed |= IEEE80211_RC_NSS_CHANGED; 1036 1037 drv_link_sta_rc_update(local, sdata, &sta->sta.deflink, 1038 changed); 1039 } 1040 1041 rcu_read_unlock(); 1042 } 1043 1044 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1045 struct ieee80211_mgmt *mgmt, size_t len, 1046 struct ieee80211_rx_status *rx_status, 1047 struct ieee802_11_elems *elems) 1048 { 1049 struct ieee80211_local *local = sdata->local; 1050 struct cfg80211_bss *cbss; 1051 struct ieee80211_bss *bss; 1052 struct ieee80211_channel *channel; 1053 u64 beacon_timestamp, rx_timestamp; 1054 u32 supp_rates = 0; 1055 enum nl80211_band band = rx_status->band; 1056 1057 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1058 if (!channel) 1059 return; 1060 1061 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1062 1063 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1064 if (!bss) 1065 return; 1066 1067 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1068 1069 /* same for beacon and probe response */ 1070 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1071 1072 /* check if we need to merge IBSS */ 1073 1074 /* not an IBSS */ 1075 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1076 goto put_bss; 1077 1078 /* different channel */ 1079 if (sdata->u.ibss.fixed_channel && 1080 sdata->u.ibss.chandef.chan != cbss->channel) 1081 goto put_bss; 1082 1083 /* different SSID */ 1084 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1085 memcmp(elems->ssid, sdata->u.ibss.ssid, 1086 sdata->u.ibss.ssid_len)) 1087 goto put_bss; 1088 1089 /* process channel switch */ 1090 if (sdata->vif.bss_conf.csa_active || 1091 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1092 goto put_bss; 1093 1094 /* same BSSID */ 1095 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1096 goto put_bss; 1097 1098 /* we use a fixed BSSID */ 1099 if (sdata->u.ibss.fixed_bssid) 1100 goto put_bss; 1101 1102 if (ieee80211_have_rx_timestamp(rx_status)) { 1103 /* time when timestamp field was received */ 1104 rx_timestamp = 1105 ieee80211_calculate_rx_timestamp(&local->hw, rx_status, 1106 len + FCS_LEN, 24); 1107 } else { 1108 /* 1109 * second best option: get current TSF 1110 * (will return -1 if not supported) 1111 */ 1112 rx_timestamp = drv_get_tsf(local, sdata); 1113 } 1114 1115 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1116 mgmt->sa, mgmt->bssid, 1117 (unsigned long long)rx_timestamp); 1118 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1119 (unsigned long long)beacon_timestamp, 1120 (unsigned long long)(rx_timestamp - beacon_timestamp), 1121 jiffies); 1122 1123 if (beacon_timestamp > rx_timestamp) { 1124 ibss_dbg(sdata, 1125 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1126 mgmt->bssid); 1127 ieee80211_sta_join_ibss(sdata, bss); 1128 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1129 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1130 supp_rates); 1131 rcu_read_unlock(); 1132 } 1133 1134 put_bss: 1135 ieee80211_rx_bss_put(local, bss); 1136 } 1137 1138 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1139 const u8 *bssid, const u8 *addr, 1140 u32 supp_rates) 1141 { 1142 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1143 struct ieee80211_local *local = sdata->local; 1144 struct sta_info *sta; 1145 struct ieee80211_chanctx_conf *chanctx_conf; 1146 struct ieee80211_supported_band *sband; 1147 int band; 1148 1149 /* 1150 * XXX: Consider removing the least recently used entry and 1151 * allow new one to be added. 1152 */ 1153 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1154 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1155 sdata->name, addr); 1156 return; 1157 } 1158 1159 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1160 return; 1161 1162 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1163 return; 1164 1165 rcu_read_lock(); 1166 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1167 if (WARN_ON_ONCE(!chanctx_conf)) { 1168 rcu_read_unlock(); 1169 return; 1170 } 1171 band = chanctx_conf->def.chan->band; 1172 rcu_read_unlock(); 1173 1174 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1175 if (!sta) 1176 return; 1177 1178 /* make sure mandatory rates are always added */ 1179 sband = local->hw.wiphy->bands[band]; 1180 sta->sta.deflink.supp_rates[band] = supp_rates | 1181 ieee80211_mandatory_rates(sband); 1182 1183 spin_lock(&ifibss->incomplete_lock); 1184 list_add(&sta->list, &ifibss->incomplete_stations); 1185 spin_unlock(&ifibss->incomplete_lock); 1186 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1187 } 1188 1189 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1190 { 1191 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1192 struct ieee80211_local *local = sdata->local; 1193 struct sta_info *sta, *tmp; 1194 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1195 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1196 1197 lockdep_assert_wiphy(local->hw.wiphy); 1198 1199 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1200 unsigned long last_active = ieee80211_sta_last_active(sta, -1); 1201 1202 if (sdata != sta->sdata) 1203 continue; 1204 1205 if (time_is_before_jiffies(last_active + exp_time) || 1206 (time_is_before_jiffies(last_active + exp_rsn) && 1207 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1208 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1209 1210 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1211 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1212 "not authorized " : "", sta->sta.addr); 1213 1214 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1215 ifibss->bssid, 1216 IEEE80211_STYPE_DEAUTH, 1217 WLAN_REASON_DEAUTH_LEAVING, 1218 true, frame_buf); 1219 WARN_ON(__sta_info_destroy(sta)); 1220 } 1221 } 1222 } 1223 1224 /* 1225 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1226 */ 1227 1228 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1229 { 1230 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1231 1232 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1233 1234 mod_timer(&ifibss->timer, 1235 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1236 1237 ieee80211_ibss_sta_expire(sdata); 1238 1239 if (time_before(jiffies, ifibss->last_scan_completed + 1240 IEEE80211_IBSS_MERGE_INTERVAL)) 1241 return; 1242 1243 if (ieee80211_sta_active_ibss(sdata)) 1244 return; 1245 1246 if (ifibss->fixed_channel) 1247 return; 1248 1249 sdata_info(sdata, 1250 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1251 1252 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1253 NULL, 0); 1254 } 1255 1256 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1257 { 1258 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1259 u8 bssid[ETH_ALEN]; 1260 u16 capability; 1261 int i; 1262 1263 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1264 1265 if (ifibss->fixed_bssid) { 1266 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1267 } else { 1268 /* Generate random, not broadcast, locally administered BSSID. Mix in 1269 * own MAC address to make sure that devices that do not have proper 1270 * random number generator get different BSSID. */ 1271 get_random_bytes(bssid, ETH_ALEN); 1272 for (i = 0; i < ETH_ALEN; i++) 1273 bssid[i] ^= sdata->vif.addr[i]; 1274 bssid[0] &= ~0x01; 1275 bssid[0] |= 0x02; 1276 } 1277 1278 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1279 1280 capability = WLAN_CAPABILITY_IBSS; 1281 1282 if (ifibss->privacy) 1283 capability |= WLAN_CAPABILITY_PRIVACY; 1284 1285 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1286 &ifibss->chandef, ifibss->basic_rates, 1287 capability, 0, true); 1288 } 1289 1290 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1291 struct ieee80211_channel **channels, 1292 unsigned int channels_max, 1293 u32 center_freq, u32 width) 1294 { 1295 struct ieee80211_channel *chan = NULL; 1296 unsigned int n_chan = 0; 1297 u32 start_freq, end_freq, freq; 1298 1299 if (width <= 20) { 1300 start_freq = center_freq; 1301 end_freq = center_freq; 1302 } else { 1303 start_freq = center_freq - width / 2 + 10; 1304 end_freq = center_freq + width / 2 - 10; 1305 } 1306 1307 for (freq = start_freq; freq <= end_freq; freq += 20) { 1308 chan = ieee80211_get_channel(wiphy, freq); 1309 if (!chan) 1310 continue; 1311 if (n_chan >= channels_max) 1312 return n_chan; 1313 1314 channels[n_chan] = chan; 1315 n_chan++; 1316 } 1317 1318 return n_chan; 1319 } 1320 1321 static unsigned int 1322 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1323 const struct cfg80211_chan_def *chandef, 1324 struct ieee80211_channel **channels, 1325 unsigned int channels_max) 1326 { 1327 unsigned int n_chan = 0; 1328 u32 width, cf1, cf2 = 0; 1329 1330 switch (chandef->width) { 1331 case NL80211_CHAN_WIDTH_40: 1332 width = 40; 1333 break; 1334 case NL80211_CHAN_WIDTH_80P80: 1335 cf2 = chandef->center_freq2; 1336 fallthrough; 1337 case NL80211_CHAN_WIDTH_80: 1338 width = 80; 1339 break; 1340 case NL80211_CHAN_WIDTH_160: 1341 width = 160; 1342 break; 1343 default: 1344 width = 20; 1345 break; 1346 } 1347 1348 cf1 = chandef->center_freq1; 1349 1350 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1351 1352 if (cf2) 1353 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1354 channels_max - n_chan, cf2, 1355 width); 1356 1357 return n_chan; 1358 } 1359 1360 /* 1361 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1362 */ 1363 1364 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1365 { 1366 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1367 struct ieee80211_local *local = sdata->local; 1368 struct cfg80211_bss *cbss; 1369 struct ieee80211_channel *chan = NULL; 1370 const u8 *bssid = NULL; 1371 int active_ibss; 1372 1373 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1374 1375 active_ibss = ieee80211_sta_active_ibss(sdata); 1376 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1377 1378 if (active_ibss) 1379 return; 1380 1381 if (ifibss->fixed_bssid) 1382 bssid = ifibss->bssid; 1383 if (ifibss->fixed_channel) 1384 chan = ifibss->chandef.chan; 1385 if (!is_zero_ether_addr(ifibss->bssid)) 1386 bssid = ifibss->bssid; 1387 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1388 ifibss->ssid, ifibss->ssid_len, 1389 IEEE80211_BSS_TYPE_IBSS, 1390 IEEE80211_PRIVACY(ifibss->privacy)); 1391 1392 if (cbss) { 1393 struct ieee80211_bss *bss; 1394 1395 bss = (void *)cbss->priv; 1396 ibss_dbg(sdata, 1397 "sta_find_ibss: selected %pM current %pM\n", 1398 cbss->bssid, ifibss->bssid); 1399 sdata_info(sdata, 1400 "Selected IBSS BSSID %pM based on configured SSID\n", 1401 cbss->bssid); 1402 1403 ieee80211_sta_join_ibss(sdata, bss); 1404 ieee80211_rx_bss_put(local, bss); 1405 return; 1406 } 1407 1408 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1409 * directly and do not waste time scanning 1410 */ 1411 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1412 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1413 bssid); 1414 ieee80211_sta_create_ibss(sdata); 1415 return; 1416 } 1417 1418 1419 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1420 1421 /* Selected IBSS not found in current scan results - try to scan */ 1422 if (time_after(jiffies, ifibss->last_scan_completed + 1423 IEEE80211_SCAN_INTERVAL)) { 1424 struct ieee80211_channel *channels[8]; 1425 unsigned int num; 1426 1427 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1428 1429 if (ifibss->fixed_channel) { 1430 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1431 &ifibss->chandef, 1432 channels, 1433 ARRAY_SIZE(channels)); 1434 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1435 ifibss->ssid_len, channels, 1436 num); 1437 } else { 1438 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1439 ifibss->ssid_len, NULL, 0); 1440 } 1441 } else { 1442 int interval = IEEE80211_SCAN_INTERVAL; 1443 1444 if (time_after(jiffies, ifibss->ibss_join_req + 1445 IEEE80211_IBSS_JOIN_TIMEOUT)) 1446 ieee80211_sta_create_ibss(sdata); 1447 1448 mod_timer(&ifibss->timer, 1449 round_jiffies(jiffies + interval)); 1450 } 1451 } 1452 1453 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1454 struct sk_buff *req) 1455 { 1456 struct ieee80211_mgmt *mgmt = (void *)req->data; 1457 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1458 struct ieee80211_local *local = sdata->local; 1459 int tx_last_beacon, len = req->len; 1460 struct sk_buff *skb; 1461 struct beacon_data *presp; 1462 u8 *pos, *end; 1463 1464 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1465 1466 presp = sdata_dereference(ifibss->presp, sdata); 1467 1468 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1469 len < 24 + 2 || !presp) 1470 return; 1471 1472 tx_last_beacon = drv_tx_last_beacon(local); 1473 1474 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1475 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1476 mgmt->bssid, tx_last_beacon); 1477 1478 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1479 return; 1480 1481 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1482 !is_broadcast_ether_addr(mgmt->bssid)) 1483 return; 1484 1485 end = ((u8 *) mgmt) + len; 1486 pos = mgmt->u.probe_req.variable; 1487 if (pos[0] != WLAN_EID_SSID || 1488 pos + 2 + pos[1] > end) { 1489 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1490 mgmt->sa); 1491 return; 1492 } 1493 if (pos[1] != 0 && 1494 (pos[1] != ifibss->ssid_len || 1495 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1496 /* Ignore ProbeReq for foreign SSID */ 1497 return; 1498 } 1499 1500 /* Reply with ProbeResp */ 1501 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1502 if (!skb) 1503 return; 1504 1505 skb_reserve(skb, local->tx_headroom); 1506 skb_put_data(skb, presp->head, presp->head_len); 1507 1508 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1509 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1510 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1511 1512 /* avoid excessive retries for probe request to wildcard SSIDs */ 1513 if (pos[1] == 0) 1514 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1515 1516 ieee80211_tx_skb(sdata, skb); 1517 } 1518 1519 static 1520 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1521 struct ieee80211_mgmt *mgmt, size_t len, 1522 struct ieee80211_rx_status *rx_status) 1523 { 1524 size_t baselen; 1525 struct ieee802_11_elems *elems; 1526 u16 type; 1527 1528 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1529 offsetof(typeof(mgmt->u.beacon), variable)); 1530 1531 /* 1532 * either beacon or probe_resp but the variable field is at the 1533 * same offset 1534 */ 1535 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1536 if (baselen > len) 1537 return; 1538 1539 type = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_TYPE; 1540 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1541 len - baselen, type, NULL); 1542 1543 if (elems) { 1544 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1545 kfree(elems); 1546 } 1547 } 1548 1549 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1550 struct sk_buff *skb) 1551 { 1552 struct ieee80211_rx_status *rx_status; 1553 struct ieee80211_mgmt *mgmt; 1554 u16 fc; 1555 struct ieee802_11_elems *elems; 1556 int ies_len; 1557 1558 rx_status = IEEE80211_SKB_RXCB(skb); 1559 mgmt = (struct ieee80211_mgmt *) skb->data; 1560 fc = le16_to_cpu(mgmt->frame_control); 1561 1562 if (!sdata->u.ibss.ssid_len) 1563 return; /* not ready to merge yet */ 1564 1565 switch (fc & IEEE80211_FCTL_STYPE) { 1566 case IEEE80211_STYPE_PROBE_REQ: 1567 ieee80211_rx_mgmt_probe_req(sdata, skb); 1568 break; 1569 case IEEE80211_STYPE_PROBE_RESP: 1570 case IEEE80211_STYPE_BEACON: 1571 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1572 rx_status); 1573 break; 1574 case IEEE80211_STYPE_AUTH: 1575 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1576 break; 1577 case IEEE80211_STYPE_DEAUTH: 1578 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1579 break; 1580 case IEEE80211_STYPE_ACTION: 1581 switch (mgmt->u.action.category) { 1582 case WLAN_CATEGORY_SPECTRUM_MGMT: 1583 ies_len = skb->len - 1584 offsetof(struct ieee80211_mgmt, 1585 u.action.chan_switch.variable); 1586 1587 if (ies_len < 0) 1588 break; 1589 1590 elems = ieee802_11_parse_elems(mgmt->u.action.chan_switch.variable, 1591 ies_len, 1592 IEEE80211_FTYPE_MGMT | 1593 IEEE80211_STYPE_ACTION, 1594 NULL); 1595 1596 if (elems && !elems->parse_error) 1597 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1598 skb->len, 1599 rx_status, 1600 elems); 1601 kfree(elems); 1602 break; 1603 } 1604 } 1605 } 1606 1607 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1608 { 1609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1610 struct sta_info *sta; 1611 1612 /* 1613 * Work could be scheduled after scan or similar 1614 * when we aren't even joined (or trying) with a 1615 * network. 1616 */ 1617 if (!ifibss->ssid_len) 1618 return; 1619 1620 spin_lock_bh(&ifibss->incomplete_lock); 1621 while (!list_empty(&ifibss->incomplete_stations)) { 1622 sta = list_first_entry(&ifibss->incomplete_stations, 1623 struct sta_info, list); 1624 list_del(&sta->list); 1625 spin_unlock_bh(&ifibss->incomplete_lock); 1626 1627 ieee80211_ibss_finish_sta(sta); 1628 rcu_read_unlock(); 1629 spin_lock_bh(&ifibss->incomplete_lock); 1630 } 1631 spin_unlock_bh(&ifibss->incomplete_lock); 1632 1633 switch (ifibss->state) { 1634 case IEEE80211_IBSS_MLME_SEARCH: 1635 ieee80211_sta_find_ibss(sdata); 1636 break; 1637 case IEEE80211_IBSS_MLME_JOINED: 1638 ieee80211_sta_merge_ibss(sdata); 1639 break; 1640 default: 1641 WARN_ON(1); 1642 break; 1643 } 1644 } 1645 1646 static void ieee80211_ibss_timer(struct timer_list *t) 1647 { 1648 struct ieee80211_sub_if_data *sdata = 1649 timer_container_of(sdata, t, u.ibss.timer); 1650 1651 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1652 } 1653 1654 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1655 { 1656 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1657 1658 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1659 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1660 spin_lock_init(&ifibss->incomplete_lock); 1661 wiphy_work_init(&ifibss->csa_connection_drop_work, 1662 ieee80211_csa_connection_drop_work); 1663 } 1664 1665 /* scan finished notification */ 1666 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1667 { 1668 struct ieee80211_sub_if_data *sdata; 1669 1670 lockdep_assert_wiphy(local->hw.wiphy); 1671 1672 list_for_each_entry(sdata, &local->interfaces, list) { 1673 if (!ieee80211_sdata_running(sdata)) 1674 continue; 1675 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1676 continue; 1677 sdata->u.ibss.last_scan_completed = jiffies; 1678 } 1679 } 1680 1681 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1682 struct cfg80211_ibss_params *params) 1683 { 1684 u64 changed = 0; 1685 enum ieee80211_chanctx_mode chanmode; 1686 struct ieee80211_local *local = sdata->local; 1687 int radar_detect_width = 0; 1688 int ret; 1689 1690 lockdep_assert_wiphy(local->hw.wiphy); 1691 1692 if (params->chandef.chan->freq_offset) { 1693 /* this may work, but is untested */ 1694 return -EOPNOTSUPP; 1695 } 1696 1697 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1698 ¶ms->chandef, 1699 sdata->wdev.iftype); 1700 if (ret < 0) 1701 return ret; 1702 1703 if (ret > 0) { 1704 if (!params->userspace_handles_dfs) 1705 return -EINVAL; 1706 radar_detect_width = BIT(params->chandef.width); 1707 } 1708 1709 chanmode = (params->channel_fixed && !ret) ? 1710 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1711 1712 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1713 radar_detect_width, -1); 1714 if (ret < 0) 1715 return ret; 1716 1717 if (params->bssid) { 1718 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1719 sdata->u.ibss.fixed_bssid = true; 1720 } else 1721 sdata->u.ibss.fixed_bssid = false; 1722 1723 sdata->u.ibss.privacy = params->privacy; 1724 sdata->u.ibss.control_port = params->control_port; 1725 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1726 sdata->u.ibss.basic_rates = params->basic_rates; 1727 sdata->u.ibss.last_scan_completed = jiffies; 1728 1729 /* fix basic_rates if channel does not support these rates */ 1730 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1731 sizeof(params->mcast_rate)); 1732 1733 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1734 1735 sdata->u.ibss.chandef = params->chandef; 1736 sdata->u.ibss.fixed_channel = params->channel_fixed; 1737 1738 if (params->ie) { 1739 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1740 GFP_KERNEL); 1741 if (sdata->u.ibss.ie) 1742 sdata->u.ibss.ie_len = params->ie_len; 1743 } 1744 1745 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1746 sdata->u.ibss.ibss_join_req = jiffies; 1747 1748 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1749 sdata->u.ibss.ssid_len = params->ssid_len; 1750 1751 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1752 sizeof(sdata->u.ibss.ht_capa)); 1753 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1754 sizeof(sdata->u.ibss.ht_capa_mask)); 1755 1756 /* 1757 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1758 * reserved, but an HT STA shall protect HT transmissions as though 1759 * the HT Protection field were set to non-HT mixed mode. 1760 * 1761 * In an IBSS, the RIFS Mode field of the HT Operation element is 1762 * also reserved, but an HT STA shall operate as though this field 1763 * were set to 1. 1764 */ 1765 1766 sdata->vif.bss_conf.ht_operation_mode |= 1767 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1768 | IEEE80211_HT_PARAM_RIFS_MODE; 1769 1770 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1771 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1772 1773 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1774 sdata->deflink.needed_rx_chains = local->rx_chains; 1775 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1776 1777 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1778 1779 return 0; 1780 } 1781 1782 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1783 { 1784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1785 1786 ifibss->ssid_len = 0; 1787 ieee80211_ibss_disconnect(sdata); 1788 eth_zero_addr(ifibss->bssid); 1789 1790 /* remove beacon */ 1791 kfree(sdata->u.ibss.ie); 1792 sdata->u.ibss.ie = NULL; 1793 sdata->u.ibss.ie_len = 0; 1794 1795 /* on the next join, re-program HT parameters */ 1796 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1797 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1798 1799 skb_queue_purge(&sdata->skb_queue); 1800 1801 timer_delete_sync(&sdata->u.ibss.timer); 1802 1803 return 0; 1804 } 1805