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) 2018-2024 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 chandef->width != NL80211_CHAN_WIDTH_5 && 171 chandef->width != NL80211_CHAN_WIDTH_10 && 172 sband->ht_cap.ht_supported) { 173 struct ieee80211_sta_ht_cap ht_cap; 174 175 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 176 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 177 178 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 179 /* 180 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 181 * field and RIFS Mode are reserved in IBSS mode, therefore 182 * keep them at 0 183 */ 184 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 185 chandef, 0, false); 186 187 /* add VHT capability and information IEs */ 188 if (chandef->width != NL80211_CHAN_WIDTH_20 && 189 chandef->width != NL80211_CHAN_WIDTH_40 && 190 sband->vht_cap.vht_supported) { 191 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 192 sband->vht_cap.cap); 193 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 194 chandef); 195 } 196 } 197 198 if (local->hw.queues >= IEEE80211_NUM_ACS) 199 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 200 201 presp->head_len = pos - presp->head; 202 if (WARN_ON(presp->head_len > frame_len)) 203 goto error; 204 205 return presp; 206 error: 207 kfree(presp); 208 return NULL; 209 } 210 211 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 212 const u8 *bssid, const int beacon_int, 213 struct cfg80211_chan_def *req_chandef, 214 const u32 basic_rates, 215 const u16 capability, u64 tsf, 216 bool creator) 217 { 218 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 219 struct ieee80211_local *local = sdata->local; 220 struct ieee80211_mgmt *mgmt; 221 struct cfg80211_bss *bss; 222 u64 bss_change; 223 struct ieee80211_chan_req chanreq = {}; 224 struct ieee80211_channel *chan; 225 struct beacon_data *presp; 226 struct cfg80211_inform_bss bss_meta = {}; 227 bool have_higher_than_11mbit; 228 bool radar_required; 229 int err; 230 231 lockdep_assert_wiphy(local->hw.wiphy); 232 233 /* Reset own TSF to allow time synchronization work. */ 234 drv_reset_tsf(local, sdata); 235 236 if (!ether_addr_equal(ifibss->bssid, bssid)) 237 sta_info_flush(sdata, -1); 238 239 /* if merging, indicate to driver that we leave the old IBSS */ 240 if (sdata->vif.cfg.ibss_joined) { 241 sdata->vif.cfg.ibss_joined = false; 242 sdata->vif.cfg.ibss_creator = false; 243 sdata->vif.bss_conf.enable_beacon = false; 244 netif_carrier_off(sdata->dev); 245 synchronize_net(); 246 ieee80211_bss_info_change_notify(sdata, 247 BSS_CHANGED_IBSS | 248 BSS_CHANGED_BEACON_ENABLED); 249 drv_leave_ibss(local, sdata); 250 } 251 252 presp = sdata_dereference(ifibss->presp, sdata); 253 RCU_INIT_POINTER(ifibss->presp, NULL); 254 if (presp) 255 kfree_rcu(presp, rcu_head); 256 257 /* make a copy of the chandef, it could be modified below. */ 258 chanreq.oper = *req_chandef; 259 chan = chanreq.oper.chan; 260 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 261 NL80211_IFTYPE_ADHOC)) { 262 if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 || 263 chanreq.oper.width == NL80211_CHAN_WIDTH_10 || 264 chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT || 265 chanreq.oper.width == NL80211_CHAN_WIDTH_20) { 266 sdata_info(sdata, 267 "Failed to join IBSS, beacons forbidden\n"); 268 return; 269 } 270 chanreq.oper.width = NL80211_CHAN_WIDTH_20; 271 chanreq.oper.center_freq1 = chan->center_freq; 272 /* check again for downgraded chandef */ 273 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 274 NL80211_IFTYPE_ADHOC)) { 275 sdata_info(sdata, 276 "Failed to join IBSS, beacons forbidden\n"); 277 return; 278 } 279 } 280 281 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 282 &chanreq.oper, NL80211_IFTYPE_ADHOC); 283 if (err < 0) { 284 sdata_info(sdata, 285 "Failed to join IBSS, invalid chandef\n"); 286 return; 287 } 288 if (err > 0 && !ifibss->userspace_handles_dfs) { 289 sdata_info(sdata, 290 "Failed to join IBSS, DFS channel without control program\n"); 291 return; 292 } 293 294 radar_required = err; 295 296 if (ieee80211_link_use_channel(&sdata->deflink, &chanreq, 297 ifibss->fixed_channel ? 298 IEEE80211_CHANCTX_SHARED : 299 IEEE80211_CHANCTX_EXCLUSIVE)) { 300 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 301 return; 302 } 303 sdata->deflink.radar_required = radar_required; 304 305 memcpy(ifibss->bssid, bssid, ETH_ALEN); 306 307 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 308 capability, tsf, &chanreq.oper, 309 &have_higher_than_11mbit, NULL); 310 if (!presp) 311 return; 312 313 rcu_assign_pointer(ifibss->presp, presp); 314 mgmt = (void *)presp->head; 315 316 sdata->vif.bss_conf.enable_beacon = true; 317 sdata->vif.bss_conf.beacon_int = beacon_int; 318 sdata->vif.bss_conf.basic_rates = basic_rates; 319 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 320 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 321 bss_change = BSS_CHANGED_BEACON_INT; 322 bss_change |= ieee80211_reset_erp_info(sdata); 323 bss_change |= BSS_CHANGED_BSSID; 324 bss_change |= BSS_CHANGED_BEACON; 325 bss_change |= BSS_CHANGED_BEACON_ENABLED; 326 bss_change |= BSS_CHANGED_BASIC_RATES; 327 bss_change |= BSS_CHANGED_HT; 328 bss_change |= BSS_CHANGED_IBSS; 329 bss_change |= BSS_CHANGED_SSID; 330 331 /* 332 * In 5 GHz/802.11a, we can always use short slot time. 333 * (IEEE 802.11-2012 18.3.8.7) 334 * 335 * In 2.4GHz, we must always use long slots in IBSS for compatibility 336 * reasons. 337 * (IEEE 802.11-2012 19.4.5) 338 * 339 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 340 */ 341 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 342 bss_change |= BSS_CHANGED_ERP_SLOT; 343 344 /* cf. IEEE 802.11 9.2.12 */ 345 sdata->deflink.operating_11g_mode = 346 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 347 348 ieee80211_set_wmm_default(&sdata->deflink, true, false); 349 350 sdata->vif.cfg.ibss_joined = true; 351 sdata->vif.cfg.ibss_creator = creator; 352 353 err = drv_join_ibss(local, sdata); 354 if (err) { 355 sdata->vif.cfg.ibss_joined = false; 356 sdata->vif.cfg.ibss_creator = false; 357 sdata->vif.bss_conf.enable_beacon = false; 358 sdata->vif.cfg.ssid_len = 0; 359 RCU_INIT_POINTER(ifibss->presp, NULL); 360 kfree_rcu(presp, rcu_head); 361 ieee80211_link_release_channel(&sdata->deflink); 362 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 363 err); 364 return; 365 } 366 367 ieee80211_bss_info_change_notify(sdata, bss_change); 368 369 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 370 mod_timer(&ifibss->timer, 371 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 372 373 bss_meta.chan = chan; 374 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 375 presp->head_len, GFP_KERNEL); 376 377 cfg80211_put_bss(local->hw.wiphy, bss); 378 netif_carrier_on(sdata->dev); 379 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 380 } 381 382 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 383 struct ieee80211_bss *bss) 384 { 385 struct cfg80211_bss *cbss = 386 container_of((void *)bss, struct cfg80211_bss, priv); 387 struct ieee80211_supported_band *sband; 388 struct cfg80211_chan_def chandef; 389 u32 basic_rates; 390 int i, j; 391 u16 beacon_int = cbss->beacon_interval; 392 const struct cfg80211_bss_ies *ies; 393 enum nl80211_channel_type chan_type; 394 u64 tsf; 395 396 lockdep_assert_wiphy(sdata->local->hw.wiphy); 397 398 if (beacon_int < 10) 399 beacon_int = 10; 400 401 switch (sdata->u.ibss.chandef.width) { 402 case NL80211_CHAN_WIDTH_20_NOHT: 403 case NL80211_CHAN_WIDTH_20: 404 case NL80211_CHAN_WIDTH_40: 405 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 406 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 407 break; 408 case NL80211_CHAN_WIDTH_5: 409 case NL80211_CHAN_WIDTH_10: 410 cfg80211_chandef_create(&chandef, cbss->channel, 411 NL80211_CHAN_NO_HT); 412 chandef.width = sdata->u.ibss.chandef.width; 413 break; 414 case NL80211_CHAN_WIDTH_80: 415 case NL80211_CHAN_WIDTH_80P80: 416 case NL80211_CHAN_WIDTH_160: 417 chandef = sdata->u.ibss.chandef; 418 chandef.chan = cbss->channel; 419 break; 420 default: 421 /* fall back to 20 MHz for unsupported modes */ 422 cfg80211_chandef_create(&chandef, cbss->channel, 423 NL80211_CHAN_NO_HT); 424 break; 425 } 426 427 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 428 429 basic_rates = 0; 430 431 for (i = 0; i < bss->supp_rates_len; i++) { 432 int rate = bss->supp_rates[i] & 0x7f; 433 bool is_basic = !!(bss->supp_rates[i] & 0x80); 434 435 for (j = 0; j < sband->n_bitrates; j++) { 436 int brate; 437 438 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5); 439 if (brate == rate) { 440 if (is_basic) 441 basic_rates |= BIT(j); 442 break; 443 } 444 } 445 } 446 447 rcu_read_lock(); 448 ies = rcu_dereference(cbss->ies); 449 tsf = ies->tsf; 450 rcu_read_unlock(); 451 452 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 453 beacon_int, 454 &chandef, 455 basic_rates, 456 cbss->capability, 457 tsf, false); 458 } 459 460 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 461 struct cfg80211_csa_settings *csa_settings, 462 u64 *changed) 463 { 464 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 465 struct beacon_data *presp, *old_presp; 466 struct cfg80211_bss *cbss; 467 const struct cfg80211_bss_ies *ies; 468 u16 capability = WLAN_CAPABILITY_IBSS; 469 u64 tsf; 470 471 lockdep_assert_wiphy(sdata->local->hw.wiphy); 472 473 if (ifibss->privacy) 474 capability |= WLAN_CAPABILITY_PRIVACY; 475 476 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 477 ifibss->bssid, ifibss->ssid, 478 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 479 IEEE80211_PRIVACY(ifibss->privacy)); 480 481 if (unlikely(!cbss)) 482 return -EINVAL; 483 484 rcu_read_lock(); 485 ies = rcu_dereference(cbss->ies); 486 tsf = ies->tsf; 487 rcu_read_unlock(); 488 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 489 490 old_presp = sdata_dereference(ifibss->presp, sdata); 491 492 presp = ieee80211_ibss_build_presp(sdata, 493 sdata->vif.bss_conf.beacon_int, 494 sdata->vif.bss_conf.basic_rates, 495 capability, tsf, &ifibss->chandef, 496 NULL, csa_settings); 497 if (!presp) 498 return -ENOMEM; 499 500 rcu_assign_pointer(ifibss->presp, presp); 501 if (old_presp) 502 kfree_rcu(old_presp, rcu_head); 503 504 *changed |= BSS_CHANGED_BEACON; 505 return 0; 506 } 507 508 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 509 { 510 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 511 struct cfg80211_bss *cbss; 512 513 lockdep_assert_wiphy(sdata->local->hw.wiphy); 514 515 /* When not connected/joined, sending CSA doesn't make sense. */ 516 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 517 return -ENOLINK; 518 519 /* update cfg80211 bss information with the new channel */ 520 if (!is_zero_ether_addr(ifibss->bssid)) { 521 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 522 ifibss->chandef.chan, 523 ifibss->bssid, ifibss->ssid, 524 ifibss->ssid_len, 525 IEEE80211_BSS_TYPE_IBSS, 526 IEEE80211_PRIVACY(ifibss->privacy)); 527 /* XXX: should not really modify cfg80211 data */ 528 if (cbss) { 529 cbss->channel = sdata->deflink.csa.chanreq.oper.chan; 530 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 531 } 532 } 533 534 ifibss->chandef = sdata->deflink.csa.chanreq.oper; 535 536 /* generate the beacon */ 537 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 538 } 539 540 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 541 { 542 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 543 544 wiphy_work_cancel(sdata->local->hw.wiphy, 545 &ifibss->csa_connection_drop_work); 546 } 547 548 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 549 __acquires(RCU) 550 { 551 struct ieee80211_sub_if_data *sdata = sta->sdata; 552 u8 addr[ETH_ALEN]; 553 554 memcpy(addr, sta->sta.addr, ETH_ALEN); 555 556 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 557 558 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 559 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 560 /* authorize the station only if the network is not RSN protected. If 561 * not wait for the userspace to authorize it */ 562 if (!sta->sdata->u.ibss.control_port) 563 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 564 565 rate_control_rate_init(&sta->deflink); 566 567 /* If it fails, maybe we raced another insertion? */ 568 if (sta_info_insert_rcu(sta)) 569 return sta_info_get(sdata, addr); 570 return sta; 571 } 572 573 static struct sta_info * 574 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 575 const u8 *addr, u32 supp_rates) 576 __acquires(RCU) 577 { 578 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 579 struct ieee80211_local *local = sdata->local; 580 struct sta_info *sta; 581 struct ieee80211_chanctx_conf *chanctx_conf; 582 struct ieee80211_supported_band *sband; 583 int band; 584 585 /* 586 * XXX: Consider removing the least recently used entry and 587 * allow new one to be added. 588 */ 589 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 590 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 591 sdata->name, addr); 592 rcu_read_lock(); 593 return NULL; 594 } 595 596 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 597 rcu_read_lock(); 598 return NULL; 599 } 600 601 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 602 rcu_read_lock(); 603 return NULL; 604 } 605 606 rcu_read_lock(); 607 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 608 if (WARN_ON_ONCE(!chanctx_conf)) 609 return NULL; 610 band = chanctx_conf->def.chan->band; 611 rcu_read_unlock(); 612 613 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 614 if (!sta) { 615 rcu_read_lock(); 616 return NULL; 617 } 618 619 /* make sure mandatory rates are always added */ 620 sband = local->hw.wiphy->bands[band]; 621 sta->sta.deflink.supp_rates[band] = supp_rates | 622 ieee80211_mandatory_rates(sband); 623 624 return ieee80211_ibss_finish_sta(sta); 625 } 626 627 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 628 { 629 struct ieee80211_local *local = sdata->local; 630 int active = 0; 631 struct sta_info *sta; 632 633 lockdep_assert_wiphy(sdata->local->hw.wiphy); 634 635 rcu_read_lock(); 636 637 list_for_each_entry_rcu(sta, &local->sta_list, list) { 638 unsigned long last_active = ieee80211_sta_last_active(sta, -1); 639 640 if (sta->sdata == sdata && 641 time_is_after_jiffies(last_active + 642 IEEE80211_IBSS_MERGE_INTERVAL)) { 643 active++; 644 break; 645 } 646 } 647 648 rcu_read_unlock(); 649 650 return active; 651 } 652 653 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 654 { 655 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 656 struct ieee80211_local *local = sdata->local; 657 struct cfg80211_bss *cbss; 658 struct beacon_data *presp; 659 struct sta_info *sta; 660 661 lockdep_assert_wiphy(local->hw.wiphy); 662 663 if (!is_zero_ether_addr(ifibss->bssid)) { 664 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 665 ifibss->bssid, ifibss->ssid, 666 ifibss->ssid_len, 667 IEEE80211_BSS_TYPE_IBSS, 668 IEEE80211_PRIVACY(ifibss->privacy)); 669 670 if (cbss) { 671 cfg80211_unlink_bss(local->hw.wiphy, cbss); 672 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 673 } 674 } 675 676 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 677 678 sta_info_flush(sdata, -1); 679 680 spin_lock_bh(&ifibss->incomplete_lock); 681 while (!list_empty(&ifibss->incomplete_stations)) { 682 sta = list_first_entry(&ifibss->incomplete_stations, 683 struct sta_info, list); 684 list_del(&sta->list); 685 spin_unlock_bh(&ifibss->incomplete_lock); 686 687 sta_info_free(local, sta); 688 spin_lock_bh(&ifibss->incomplete_lock); 689 } 690 spin_unlock_bh(&ifibss->incomplete_lock); 691 692 netif_carrier_off(sdata->dev); 693 694 sdata->vif.cfg.ibss_joined = false; 695 sdata->vif.cfg.ibss_creator = false; 696 sdata->vif.bss_conf.enable_beacon = false; 697 sdata->vif.cfg.ssid_len = 0; 698 699 /* remove beacon */ 700 presp = sdata_dereference(ifibss->presp, sdata); 701 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 702 if (presp) 703 kfree_rcu(presp, rcu_head); 704 705 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 706 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 707 BSS_CHANGED_IBSS); 708 drv_leave_ibss(local, sdata); 709 ieee80211_link_release_channel(&sdata->deflink); 710 } 711 712 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 713 struct wiphy_work *work) 714 { 715 struct ieee80211_sub_if_data *sdata = 716 container_of(work, struct ieee80211_sub_if_data, 717 u.ibss.csa_connection_drop_work); 718 719 ieee80211_ibss_disconnect(sdata); 720 synchronize_rcu(); 721 skb_queue_purge(&sdata->skb_queue); 722 723 /* trigger a scan to find another IBSS network to join */ 724 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 725 } 726 727 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 728 { 729 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 730 int err; 731 732 /* if the current channel is a DFS channel, mark the channel as 733 * unavailable. 734 */ 735 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 736 &ifibss->chandef, 737 NL80211_IFTYPE_ADHOC); 738 if (err > 0) 739 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 740 GFP_ATOMIC); 741 } 742 743 static bool 744 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 745 struct ieee802_11_elems *elems, 746 bool beacon) 747 { 748 struct cfg80211_csa_settings params; 749 struct ieee80211_csa_ie csa_ie; 750 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 751 enum nl80211_channel_type ch_type; 752 int err; 753 struct ieee80211_conn_settings conn = { 754 .mode = IEEE80211_CONN_MODE_HT, 755 .bw_limit = IEEE80211_CONN_BW_LIMIT_40, 756 }; 757 u32 vht_cap_info = 0; 758 759 lockdep_assert_wiphy(sdata->local->hw.wiphy); 760 761 switch (ifibss->chandef.width) { 762 case NL80211_CHAN_WIDTH_5: 763 case NL80211_CHAN_WIDTH_10: 764 case NL80211_CHAN_WIDTH_20_NOHT: 765 conn.mode = IEEE80211_CONN_MODE_LEGACY; 766 fallthrough; 767 case NL80211_CHAN_WIDTH_20: 768 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20; 769 break; 770 default: 771 break; 772 } 773 774 if (elems->vht_cap_elem) 775 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 776 777 memset(¶ms, 0, sizeof(params)); 778 err = ieee80211_parse_ch_switch_ie(sdata, elems, 779 ifibss->chandef.chan->band, 780 vht_cap_info, &conn, 781 ifibss->bssid, false, 782 &csa_ie); 783 /* can't switch to destination channel, fail */ 784 if (err < 0) 785 goto disconnect; 786 787 /* did not contain a CSA */ 788 if (err) 789 return false; 790 791 /* channel switch is not supported, disconnect */ 792 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 793 goto disconnect; 794 795 params.count = csa_ie.count; 796 params.chandef = csa_ie.chanreq.oper; 797 798 switch (ifibss->chandef.width) { 799 case NL80211_CHAN_WIDTH_20_NOHT: 800 case NL80211_CHAN_WIDTH_20: 801 case NL80211_CHAN_WIDTH_40: 802 /* keep our current HT mode (HT20/HT40+/HT40-), even if 803 * another mode has been announced. The mode is not adopted 804 * within the beacon while doing CSA and we should therefore 805 * keep the mode which we announce. 806 */ 807 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 808 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 809 ch_type); 810 break; 811 case NL80211_CHAN_WIDTH_5: 812 case NL80211_CHAN_WIDTH_10: 813 if (params.chandef.width != ifibss->chandef.width) { 814 sdata_info(sdata, 815 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 816 ifibss->bssid, 817 params.chandef.chan->center_freq, 818 params.chandef.width, 819 params.chandef.center_freq1, 820 params.chandef.center_freq2); 821 goto disconnect; 822 } 823 break; 824 default: 825 /* should not happen, conn_flags should prevent VHT modes. */ 826 WARN_ON(1); 827 goto disconnect; 828 } 829 830 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 831 NL80211_IFTYPE_ADHOC)) { 832 sdata_info(sdata, 833 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 834 ifibss->bssid, 835 params.chandef.chan->center_freq, 836 params.chandef.width, 837 params.chandef.center_freq1, 838 params.chandef.center_freq2); 839 goto disconnect; 840 } 841 842 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 843 ¶ms.chandef, 844 NL80211_IFTYPE_ADHOC); 845 if (err < 0) 846 goto disconnect; 847 if (err > 0 && !ifibss->userspace_handles_dfs) { 848 /* IBSS-DFS only allowed with a control program */ 849 goto disconnect; 850 } 851 852 params.radar_required = err; 853 854 if (cfg80211_chandef_identical(¶ms.chandef, 855 &sdata->vif.bss_conf.chanreq.oper)) { 856 ibss_dbg(sdata, 857 "received csa with an identical chandef, ignoring\n"); 858 return true; 859 } 860 861 /* all checks done, now perform the channel switch. */ 862 ibss_dbg(sdata, 863 "received channel switch announcement to go to channel %d MHz\n", 864 params.chandef.chan->center_freq); 865 866 params.block_tx = !!csa_ie.mode; 867 868 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 869 ¶ms)) 870 goto disconnect; 871 872 ieee80211_ibss_csa_mark_radar(sdata); 873 874 return true; 875 disconnect: 876 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 877 wiphy_work_queue(sdata->local->hw.wiphy, 878 &ifibss->csa_connection_drop_work); 879 880 ieee80211_ibss_csa_mark_radar(sdata); 881 882 return true; 883 } 884 885 static void 886 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 887 struct ieee80211_mgmt *mgmt, size_t len, 888 struct ieee80211_rx_status *rx_status, 889 struct ieee802_11_elems *elems) 890 { 891 int required_len; 892 893 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 894 return; 895 896 /* CSA is the only action we handle for now */ 897 if (mgmt->u.action.u.measurement.action_code != 898 WLAN_ACTION_SPCT_CHL_SWITCH) 899 return; 900 901 required_len = IEEE80211_MIN_ACTION_SIZE + 902 sizeof(mgmt->u.action.u.chan_switch); 903 if (len < required_len) 904 return; 905 906 if (!sdata->vif.bss_conf.csa_active) 907 ieee80211_ibss_process_chanswitch(sdata, elems, false); 908 } 909 910 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 911 struct ieee80211_mgmt *mgmt, 912 size_t len) 913 { 914 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 915 916 if (len < IEEE80211_DEAUTH_FRAME_LEN) 917 return; 918 919 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 920 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 921 sta_info_destroy_addr(sdata, mgmt->sa); 922 } 923 924 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 925 struct ieee80211_mgmt *mgmt, 926 size_t len) 927 { 928 u16 auth_alg, auth_transaction; 929 930 lockdep_assert_wiphy(sdata->local->hw.wiphy); 931 932 if (len < 24 + 6) 933 return; 934 935 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 936 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 937 938 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 939 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 940 mgmt->bssid, auth_transaction); 941 942 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 943 return; 944 945 /* 946 * IEEE 802.11 standard does not require authentication in IBSS 947 * networks and most implementations do not seem to use it. 948 * However, try to reply to authentication attempts if someone 949 * has actually implemented this. 950 */ 951 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 952 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 953 } 954 955 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 956 struct ieee80211_mgmt *mgmt, size_t len, 957 struct ieee80211_rx_status *rx_status, 958 struct ieee802_11_elems *elems, 959 struct ieee80211_channel *channel) 960 { 961 struct sta_info *sta; 962 enum nl80211_band band = rx_status->band; 963 struct ieee80211_local *local = sdata->local; 964 struct ieee80211_supported_band *sband; 965 bool rates_updated = false; 966 u32 supp_rates = 0; 967 968 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 969 return; 970 971 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 972 return; 973 974 sband = local->hw.wiphy->bands[band]; 975 if (WARN_ON(!sband)) 976 return; 977 978 rcu_read_lock(); 979 sta = sta_info_get(sdata, mgmt->sa); 980 981 if (elems->supp_rates) { 982 supp_rates = ieee80211_sta_get_rates(sdata, elems, 983 band, NULL); 984 if (sta) { 985 u32 prev_rates; 986 987 prev_rates = sta->sta.deflink.supp_rates[band]; 988 989 sta->sta.deflink.supp_rates[band] = supp_rates | 990 ieee80211_mandatory_rates(sband); 991 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 992 ibss_dbg(sdata, 993 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 994 sta->sta.addr, prev_rates, 995 sta->sta.deflink.supp_rates[band]); 996 rates_updated = true; 997 } 998 } else { 999 rcu_read_unlock(); 1000 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1001 mgmt->sa, supp_rates); 1002 } 1003 } 1004 1005 if (sta && !sta->sta.wme && 1006 (elems->wmm_info || elems->s1g_capab) && 1007 local->hw.queues >= IEEE80211_NUM_ACS) { 1008 sta->sta.wme = true; 1009 ieee80211_check_fast_xmit(sta); 1010 } 1011 1012 if (sta && elems->ht_operation && elems->ht_cap_elem && 1013 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1014 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1015 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1016 /* we both use HT */ 1017 struct ieee80211_ht_cap htcap_ie; 1018 struct cfg80211_chan_def chandef; 1019 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1020 1021 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1022 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1023 1024 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1025 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1026 &htcap_ie, 1027 &sta->deflink); 1028 1029 if (elems->vht_operation && elems->vht_cap_elem && 1030 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1031 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1032 /* we both use VHT */ 1033 struct ieee80211_vht_cap cap_ie; 1034 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1035 u32 vht_cap_info = 1036 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1037 1038 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1039 elems->vht_operation, 1040 elems->ht_operation, 1041 &chandef); 1042 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1043 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1044 &cap_ie, NULL, 1045 &sta->deflink); 1046 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1047 rates_updated |= true; 1048 } 1049 1050 if (bw != sta->sta.deflink.bandwidth) 1051 rates_updated |= true; 1052 1053 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1054 &chandef)) 1055 WARN_ON_ONCE(1); 1056 } 1057 1058 if (sta && rates_updated) { 1059 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1060 u8 rx_nss = sta->sta.deflink.rx_nss; 1061 1062 /* Force rx_nss recalculation */ 1063 sta->sta.deflink.rx_nss = 0; 1064 rate_control_rate_init(&sta->deflink); 1065 if (sta->sta.deflink.rx_nss != rx_nss) 1066 changed |= IEEE80211_RC_NSS_CHANGED; 1067 1068 drv_link_sta_rc_update(local, sdata, &sta->sta.deflink, 1069 changed); 1070 } 1071 1072 rcu_read_unlock(); 1073 } 1074 1075 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1076 struct ieee80211_mgmt *mgmt, size_t len, 1077 struct ieee80211_rx_status *rx_status, 1078 struct ieee802_11_elems *elems) 1079 { 1080 struct ieee80211_local *local = sdata->local; 1081 struct cfg80211_bss *cbss; 1082 struct ieee80211_bss *bss; 1083 struct ieee80211_channel *channel; 1084 u64 beacon_timestamp, rx_timestamp; 1085 u32 supp_rates = 0; 1086 enum nl80211_band band = rx_status->band; 1087 1088 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1089 if (!channel) 1090 return; 1091 1092 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1093 1094 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1095 if (!bss) 1096 return; 1097 1098 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1099 1100 /* same for beacon and probe response */ 1101 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1102 1103 /* check if we need to merge IBSS */ 1104 1105 /* not an IBSS */ 1106 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1107 goto put_bss; 1108 1109 /* different channel */ 1110 if (sdata->u.ibss.fixed_channel && 1111 sdata->u.ibss.chandef.chan != cbss->channel) 1112 goto put_bss; 1113 1114 /* different SSID */ 1115 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1116 memcmp(elems->ssid, sdata->u.ibss.ssid, 1117 sdata->u.ibss.ssid_len)) 1118 goto put_bss; 1119 1120 /* process channel switch */ 1121 if (sdata->vif.bss_conf.csa_active || 1122 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1123 goto put_bss; 1124 1125 /* same BSSID */ 1126 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1127 goto put_bss; 1128 1129 /* we use a fixed BSSID */ 1130 if (sdata->u.ibss.fixed_bssid) 1131 goto put_bss; 1132 1133 if (ieee80211_have_rx_timestamp(rx_status)) { 1134 /* time when timestamp field was received */ 1135 rx_timestamp = 1136 ieee80211_calculate_rx_timestamp(local, rx_status, 1137 len + FCS_LEN, 24); 1138 } else { 1139 /* 1140 * second best option: get current TSF 1141 * (will return -1 if not supported) 1142 */ 1143 rx_timestamp = drv_get_tsf(local, sdata); 1144 } 1145 1146 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1147 mgmt->sa, mgmt->bssid, 1148 (unsigned long long)rx_timestamp); 1149 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1150 (unsigned long long)beacon_timestamp, 1151 (unsigned long long)(rx_timestamp - beacon_timestamp), 1152 jiffies); 1153 1154 if (beacon_timestamp > rx_timestamp) { 1155 ibss_dbg(sdata, 1156 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1157 mgmt->bssid); 1158 ieee80211_sta_join_ibss(sdata, bss); 1159 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1160 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1161 supp_rates); 1162 rcu_read_unlock(); 1163 } 1164 1165 put_bss: 1166 ieee80211_rx_bss_put(local, bss); 1167 } 1168 1169 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1170 const u8 *bssid, const u8 *addr, 1171 u32 supp_rates) 1172 { 1173 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1174 struct ieee80211_local *local = sdata->local; 1175 struct sta_info *sta; 1176 struct ieee80211_chanctx_conf *chanctx_conf; 1177 struct ieee80211_supported_band *sband; 1178 int band; 1179 1180 /* 1181 * XXX: Consider removing the least recently used entry and 1182 * allow new one to be added. 1183 */ 1184 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1185 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1186 sdata->name, addr); 1187 return; 1188 } 1189 1190 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1191 return; 1192 1193 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1194 return; 1195 1196 rcu_read_lock(); 1197 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1198 if (WARN_ON_ONCE(!chanctx_conf)) { 1199 rcu_read_unlock(); 1200 return; 1201 } 1202 band = chanctx_conf->def.chan->band; 1203 rcu_read_unlock(); 1204 1205 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1206 if (!sta) 1207 return; 1208 1209 /* make sure mandatory rates are always added */ 1210 sband = local->hw.wiphy->bands[band]; 1211 sta->sta.deflink.supp_rates[band] = supp_rates | 1212 ieee80211_mandatory_rates(sband); 1213 1214 spin_lock(&ifibss->incomplete_lock); 1215 list_add(&sta->list, &ifibss->incomplete_stations); 1216 spin_unlock(&ifibss->incomplete_lock); 1217 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1218 } 1219 1220 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1221 { 1222 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1223 struct ieee80211_local *local = sdata->local; 1224 struct sta_info *sta, *tmp; 1225 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1226 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1227 1228 lockdep_assert_wiphy(local->hw.wiphy); 1229 1230 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1231 unsigned long last_active = ieee80211_sta_last_active(sta, -1); 1232 1233 if (sdata != sta->sdata) 1234 continue; 1235 1236 if (time_is_before_jiffies(last_active + exp_time) || 1237 (time_is_before_jiffies(last_active + exp_rsn) && 1238 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1239 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1240 1241 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1242 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1243 "not authorized " : "", sta->sta.addr); 1244 1245 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1246 ifibss->bssid, 1247 IEEE80211_STYPE_DEAUTH, 1248 WLAN_REASON_DEAUTH_LEAVING, 1249 true, frame_buf); 1250 WARN_ON(__sta_info_destroy(sta)); 1251 } 1252 } 1253 } 1254 1255 /* 1256 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1257 */ 1258 1259 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1260 { 1261 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1262 1263 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1264 1265 mod_timer(&ifibss->timer, 1266 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1267 1268 ieee80211_ibss_sta_expire(sdata); 1269 1270 if (time_before(jiffies, ifibss->last_scan_completed + 1271 IEEE80211_IBSS_MERGE_INTERVAL)) 1272 return; 1273 1274 if (ieee80211_sta_active_ibss(sdata)) 1275 return; 1276 1277 if (ifibss->fixed_channel) 1278 return; 1279 1280 sdata_info(sdata, 1281 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1282 1283 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1284 NULL, 0); 1285 } 1286 1287 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1288 { 1289 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1290 u8 bssid[ETH_ALEN]; 1291 u16 capability; 1292 int i; 1293 1294 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1295 1296 if (ifibss->fixed_bssid) { 1297 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1298 } else { 1299 /* Generate random, not broadcast, locally administered BSSID. Mix in 1300 * own MAC address to make sure that devices that do not have proper 1301 * random number generator get different BSSID. */ 1302 get_random_bytes(bssid, ETH_ALEN); 1303 for (i = 0; i < ETH_ALEN; i++) 1304 bssid[i] ^= sdata->vif.addr[i]; 1305 bssid[0] &= ~0x01; 1306 bssid[0] |= 0x02; 1307 } 1308 1309 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1310 1311 capability = WLAN_CAPABILITY_IBSS; 1312 1313 if (ifibss->privacy) 1314 capability |= WLAN_CAPABILITY_PRIVACY; 1315 1316 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1317 &ifibss->chandef, ifibss->basic_rates, 1318 capability, 0, true); 1319 } 1320 1321 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1322 struct ieee80211_channel **channels, 1323 unsigned int channels_max, 1324 u32 center_freq, u32 width) 1325 { 1326 struct ieee80211_channel *chan = NULL; 1327 unsigned int n_chan = 0; 1328 u32 start_freq, end_freq, freq; 1329 1330 if (width <= 20) { 1331 start_freq = center_freq; 1332 end_freq = center_freq; 1333 } else { 1334 start_freq = center_freq - width / 2 + 10; 1335 end_freq = center_freq + width / 2 - 10; 1336 } 1337 1338 for (freq = start_freq; freq <= end_freq; freq += 20) { 1339 chan = ieee80211_get_channel(wiphy, freq); 1340 if (!chan) 1341 continue; 1342 if (n_chan >= channels_max) 1343 return n_chan; 1344 1345 channels[n_chan] = chan; 1346 n_chan++; 1347 } 1348 1349 return n_chan; 1350 } 1351 1352 static unsigned int 1353 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1354 const struct cfg80211_chan_def *chandef, 1355 struct ieee80211_channel **channels, 1356 unsigned int channels_max) 1357 { 1358 unsigned int n_chan = 0; 1359 u32 width, cf1, cf2 = 0; 1360 1361 switch (chandef->width) { 1362 case NL80211_CHAN_WIDTH_40: 1363 width = 40; 1364 break; 1365 case NL80211_CHAN_WIDTH_80P80: 1366 cf2 = chandef->center_freq2; 1367 fallthrough; 1368 case NL80211_CHAN_WIDTH_80: 1369 width = 80; 1370 break; 1371 case NL80211_CHAN_WIDTH_160: 1372 width = 160; 1373 break; 1374 default: 1375 width = 20; 1376 break; 1377 } 1378 1379 cf1 = chandef->center_freq1; 1380 1381 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1382 1383 if (cf2) 1384 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1385 channels_max - n_chan, cf2, 1386 width); 1387 1388 return n_chan; 1389 } 1390 1391 /* 1392 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1393 */ 1394 1395 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1396 { 1397 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1398 struct ieee80211_local *local = sdata->local; 1399 struct cfg80211_bss *cbss; 1400 struct ieee80211_channel *chan = NULL; 1401 const u8 *bssid = NULL; 1402 int active_ibss; 1403 1404 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1405 1406 active_ibss = ieee80211_sta_active_ibss(sdata); 1407 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1408 1409 if (active_ibss) 1410 return; 1411 1412 if (ifibss->fixed_bssid) 1413 bssid = ifibss->bssid; 1414 if (ifibss->fixed_channel) 1415 chan = ifibss->chandef.chan; 1416 if (!is_zero_ether_addr(ifibss->bssid)) 1417 bssid = ifibss->bssid; 1418 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1419 ifibss->ssid, ifibss->ssid_len, 1420 IEEE80211_BSS_TYPE_IBSS, 1421 IEEE80211_PRIVACY(ifibss->privacy)); 1422 1423 if (cbss) { 1424 struct ieee80211_bss *bss; 1425 1426 bss = (void *)cbss->priv; 1427 ibss_dbg(sdata, 1428 "sta_find_ibss: selected %pM current %pM\n", 1429 cbss->bssid, ifibss->bssid); 1430 sdata_info(sdata, 1431 "Selected IBSS BSSID %pM based on configured SSID\n", 1432 cbss->bssid); 1433 1434 ieee80211_sta_join_ibss(sdata, bss); 1435 ieee80211_rx_bss_put(local, bss); 1436 return; 1437 } 1438 1439 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1440 * directly and do not waste time scanning 1441 */ 1442 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1443 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1444 bssid); 1445 ieee80211_sta_create_ibss(sdata); 1446 return; 1447 } 1448 1449 1450 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1451 1452 /* Selected IBSS not found in current scan results - try to scan */ 1453 if (time_after(jiffies, ifibss->last_scan_completed + 1454 IEEE80211_SCAN_INTERVAL)) { 1455 struct ieee80211_channel *channels[8]; 1456 unsigned int num; 1457 1458 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1459 1460 if (ifibss->fixed_channel) { 1461 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1462 &ifibss->chandef, 1463 channels, 1464 ARRAY_SIZE(channels)); 1465 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1466 ifibss->ssid_len, channels, 1467 num); 1468 } else { 1469 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1470 ifibss->ssid_len, NULL, 0); 1471 } 1472 } else { 1473 int interval = IEEE80211_SCAN_INTERVAL; 1474 1475 if (time_after(jiffies, ifibss->ibss_join_req + 1476 IEEE80211_IBSS_JOIN_TIMEOUT)) 1477 ieee80211_sta_create_ibss(sdata); 1478 1479 mod_timer(&ifibss->timer, 1480 round_jiffies(jiffies + interval)); 1481 } 1482 } 1483 1484 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1485 struct sk_buff *req) 1486 { 1487 struct ieee80211_mgmt *mgmt = (void *)req->data; 1488 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1489 struct ieee80211_local *local = sdata->local; 1490 int tx_last_beacon, len = req->len; 1491 struct sk_buff *skb; 1492 struct beacon_data *presp; 1493 u8 *pos, *end; 1494 1495 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1496 1497 presp = sdata_dereference(ifibss->presp, sdata); 1498 1499 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1500 len < 24 + 2 || !presp) 1501 return; 1502 1503 tx_last_beacon = drv_tx_last_beacon(local); 1504 1505 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1506 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1507 mgmt->bssid, tx_last_beacon); 1508 1509 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1510 return; 1511 1512 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1513 !is_broadcast_ether_addr(mgmt->bssid)) 1514 return; 1515 1516 end = ((u8 *) mgmt) + len; 1517 pos = mgmt->u.probe_req.variable; 1518 if (pos[0] != WLAN_EID_SSID || 1519 pos + 2 + pos[1] > end) { 1520 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1521 mgmt->sa); 1522 return; 1523 } 1524 if (pos[1] != 0 && 1525 (pos[1] != ifibss->ssid_len || 1526 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1527 /* Ignore ProbeReq for foreign SSID */ 1528 return; 1529 } 1530 1531 /* Reply with ProbeResp */ 1532 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1533 if (!skb) 1534 return; 1535 1536 skb_reserve(skb, local->tx_headroom); 1537 skb_put_data(skb, presp->head, presp->head_len); 1538 1539 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1540 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1541 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1542 1543 /* avoid excessive retries for probe request to wildcard SSIDs */ 1544 if (pos[1] == 0) 1545 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1546 1547 ieee80211_tx_skb(sdata, skb); 1548 } 1549 1550 static 1551 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1552 struct ieee80211_mgmt *mgmt, size_t len, 1553 struct ieee80211_rx_status *rx_status) 1554 { 1555 size_t baselen; 1556 struct ieee802_11_elems *elems; 1557 1558 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1559 offsetof(typeof(mgmt->u.beacon), variable)); 1560 1561 /* 1562 * either beacon or probe_resp but the variable field is at the 1563 * same offset 1564 */ 1565 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1566 if (baselen > len) 1567 return; 1568 1569 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1570 len - baselen, false, NULL); 1571 1572 if (elems) { 1573 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1574 kfree(elems); 1575 } 1576 } 1577 1578 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1579 struct sk_buff *skb) 1580 { 1581 struct ieee80211_rx_status *rx_status; 1582 struct ieee80211_mgmt *mgmt; 1583 u16 fc; 1584 struct ieee802_11_elems *elems; 1585 int ies_len; 1586 1587 rx_status = IEEE80211_SKB_RXCB(skb); 1588 mgmt = (struct ieee80211_mgmt *) skb->data; 1589 fc = le16_to_cpu(mgmt->frame_control); 1590 1591 if (!sdata->u.ibss.ssid_len) 1592 return; /* not ready to merge yet */ 1593 1594 switch (fc & IEEE80211_FCTL_STYPE) { 1595 case IEEE80211_STYPE_PROBE_REQ: 1596 ieee80211_rx_mgmt_probe_req(sdata, skb); 1597 break; 1598 case IEEE80211_STYPE_PROBE_RESP: 1599 case IEEE80211_STYPE_BEACON: 1600 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1601 rx_status); 1602 break; 1603 case IEEE80211_STYPE_AUTH: 1604 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1605 break; 1606 case IEEE80211_STYPE_DEAUTH: 1607 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1608 break; 1609 case IEEE80211_STYPE_ACTION: 1610 switch (mgmt->u.action.category) { 1611 case WLAN_CATEGORY_SPECTRUM_MGMT: 1612 ies_len = skb->len - 1613 offsetof(struct ieee80211_mgmt, 1614 u.action.u.chan_switch.variable); 1615 1616 if (ies_len < 0) 1617 break; 1618 1619 elems = ieee802_11_parse_elems( 1620 mgmt->u.action.u.chan_switch.variable, 1621 ies_len, true, NULL); 1622 1623 if (elems && !elems->parse_error) 1624 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1625 skb->len, 1626 rx_status, 1627 elems); 1628 kfree(elems); 1629 break; 1630 } 1631 } 1632 } 1633 1634 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1635 { 1636 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1637 struct sta_info *sta; 1638 1639 /* 1640 * Work could be scheduled after scan or similar 1641 * when we aren't even joined (or trying) with a 1642 * network. 1643 */ 1644 if (!ifibss->ssid_len) 1645 return; 1646 1647 spin_lock_bh(&ifibss->incomplete_lock); 1648 while (!list_empty(&ifibss->incomplete_stations)) { 1649 sta = list_first_entry(&ifibss->incomplete_stations, 1650 struct sta_info, list); 1651 list_del(&sta->list); 1652 spin_unlock_bh(&ifibss->incomplete_lock); 1653 1654 ieee80211_ibss_finish_sta(sta); 1655 rcu_read_unlock(); 1656 spin_lock_bh(&ifibss->incomplete_lock); 1657 } 1658 spin_unlock_bh(&ifibss->incomplete_lock); 1659 1660 switch (ifibss->state) { 1661 case IEEE80211_IBSS_MLME_SEARCH: 1662 ieee80211_sta_find_ibss(sdata); 1663 break; 1664 case IEEE80211_IBSS_MLME_JOINED: 1665 ieee80211_sta_merge_ibss(sdata); 1666 break; 1667 default: 1668 WARN_ON(1); 1669 break; 1670 } 1671 } 1672 1673 static void ieee80211_ibss_timer(struct timer_list *t) 1674 { 1675 struct ieee80211_sub_if_data *sdata = 1676 timer_container_of(sdata, t, u.ibss.timer); 1677 1678 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1679 } 1680 1681 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1682 { 1683 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1684 1685 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1686 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1687 spin_lock_init(&ifibss->incomplete_lock); 1688 wiphy_work_init(&ifibss->csa_connection_drop_work, 1689 ieee80211_csa_connection_drop_work); 1690 } 1691 1692 /* scan finished notification */ 1693 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1694 { 1695 struct ieee80211_sub_if_data *sdata; 1696 1697 lockdep_assert_wiphy(local->hw.wiphy); 1698 1699 list_for_each_entry(sdata, &local->interfaces, list) { 1700 if (!ieee80211_sdata_running(sdata)) 1701 continue; 1702 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1703 continue; 1704 sdata->u.ibss.last_scan_completed = jiffies; 1705 } 1706 } 1707 1708 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1709 struct cfg80211_ibss_params *params) 1710 { 1711 u64 changed = 0; 1712 enum ieee80211_chanctx_mode chanmode; 1713 struct ieee80211_local *local = sdata->local; 1714 int radar_detect_width = 0; 1715 int ret; 1716 1717 lockdep_assert_wiphy(local->hw.wiphy); 1718 1719 if (params->chandef.chan->freq_offset) { 1720 /* this may work, but is untested */ 1721 return -EOPNOTSUPP; 1722 } 1723 1724 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1725 ¶ms->chandef, 1726 sdata->wdev.iftype); 1727 if (ret < 0) 1728 return ret; 1729 1730 if (ret > 0) { 1731 if (!params->userspace_handles_dfs) 1732 return -EINVAL; 1733 radar_detect_width = BIT(params->chandef.width); 1734 } 1735 1736 chanmode = (params->channel_fixed && !ret) ? 1737 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1738 1739 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1740 radar_detect_width, -1); 1741 if (ret < 0) 1742 return ret; 1743 1744 if (params->bssid) { 1745 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1746 sdata->u.ibss.fixed_bssid = true; 1747 } else 1748 sdata->u.ibss.fixed_bssid = false; 1749 1750 sdata->u.ibss.privacy = params->privacy; 1751 sdata->u.ibss.control_port = params->control_port; 1752 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1753 sdata->u.ibss.basic_rates = params->basic_rates; 1754 sdata->u.ibss.last_scan_completed = jiffies; 1755 1756 /* fix basic_rates if channel does not support these rates */ 1757 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1758 sizeof(params->mcast_rate)); 1759 1760 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1761 1762 sdata->u.ibss.chandef = params->chandef; 1763 sdata->u.ibss.fixed_channel = params->channel_fixed; 1764 1765 if (params->ie) { 1766 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1767 GFP_KERNEL); 1768 if (sdata->u.ibss.ie) 1769 sdata->u.ibss.ie_len = params->ie_len; 1770 } 1771 1772 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1773 sdata->u.ibss.ibss_join_req = jiffies; 1774 1775 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1776 sdata->u.ibss.ssid_len = params->ssid_len; 1777 1778 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1779 sizeof(sdata->u.ibss.ht_capa)); 1780 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1781 sizeof(sdata->u.ibss.ht_capa_mask)); 1782 1783 /* 1784 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1785 * reserved, but an HT STA shall protect HT transmissions as though 1786 * the HT Protection field were set to non-HT mixed mode. 1787 * 1788 * In an IBSS, the RIFS Mode field of the HT Operation element is 1789 * also reserved, but an HT STA shall operate as though this field 1790 * were set to 1. 1791 */ 1792 1793 sdata->vif.bss_conf.ht_operation_mode |= 1794 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1795 | IEEE80211_HT_PARAM_RIFS_MODE; 1796 1797 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1798 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1799 1800 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1801 sdata->deflink.needed_rx_chains = local->rx_chains; 1802 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1803 1804 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1805 1806 return 0; 1807 } 1808 1809 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1810 { 1811 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1812 1813 ifibss->ssid_len = 0; 1814 ieee80211_ibss_disconnect(sdata); 1815 eth_zero_addr(ifibss->bssid); 1816 1817 /* remove beacon */ 1818 kfree(sdata->u.ibss.ie); 1819 sdata->u.ibss.ie = NULL; 1820 sdata->u.ibss.ie_len = 0; 1821 1822 /* on the next join, re-program HT parameters */ 1823 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1824 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1825 1826 synchronize_rcu(); 1827 1828 skb_queue_purge(&sdata->skb_queue); 1829 1830 timer_delete_sync(&sdata->u.ibss.timer); 1831 1832 return 0; 1833 } 1834