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) 2018-2023 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 rate_flags, 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 rate_flags = ieee80211_chandef_rate_flags(chandef); 94 rates_n = 0; 95 if (have_higher_than_11mbit) 96 *have_higher_than_11mbit = false; 97 98 for (i = 0; i < sband->n_bitrates; i++) { 99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 100 continue; 101 if (sband->bitrates[i].bitrate > 110 && 102 have_higher_than_11mbit) 103 *have_higher_than_11mbit = true; 104 105 rates |= BIT(i); 106 rates_n++; 107 } 108 109 *pos++ = WLAN_EID_SUPP_RATES; 110 *pos++ = min_t(int, 8, rates_n); 111 for (ri = 0; ri < sband->n_bitrates; ri++) { 112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 113 u8 basic = 0; 114 if (!(rates & BIT(ri))) 115 continue; 116 117 if (basic_rates & BIT(ri)) 118 basic = 0x80; 119 *pos++ = basic | (u8) rate; 120 if (++rates_added == 8) { 121 ri++; /* continue at next rate for EXT_SUPP_RATES */ 122 break; 123 } 124 } 125 126 if (sband->band == NL80211_BAND_2GHZ) { 127 *pos++ = WLAN_EID_DS_PARAMS; 128 *pos++ = 1; 129 *pos++ = ieee80211_frequency_to_channel( 130 chandef->chan->center_freq); 131 } 132 133 *pos++ = WLAN_EID_IBSS_PARAMS; 134 *pos++ = 2; 135 /* FIX: set ATIM window based on scan results */ 136 *pos++ = 0; 137 *pos++ = 0; 138 139 if (csa_settings) { 140 *pos++ = WLAN_EID_CHANNEL_SWITCH; 141 *pos++ = 3; 142 *pos++ = csa_settings->block_tx ? 1 : 0; 143 *pos++ = ieee80211_frequency_to_channel( 144 csa_settings->chandef.chan->center_freq); 145 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 146 *pos++ = csa_settings->count; 147 presp->cntdwn_current_counter = csa_settings->count; 148 } 149 150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 151 if (rates_n > 8) { 152 *pos++ = WLAN_EID_EXT_SUPP_RATES; 153 *pos++ = rates_n - 8; 154 for (; ri < sband->n_bitrates; ri++) { 155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 156 u8 basic = 0; 157 if (!(rates & BIT(ri))) 158 continue; 159 160 if (basic_rates & BIT(ri)) 161 basic = 0x80; 162 *pos++ = basic | (u8) rate; 163 } 164 } 165 166 if (ifibss->ie_len) { 167 memcpy(pos, ifibss->ie, ifibss->ie_len); 168 pos += ifibss->ie_len; 169 } 170 171 /* add HT capability and information IEs */ 172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 173 chandef->width != NL80211_CHAN_WIDTH_5 && 174 chandef->width != NL80211_CHAN_WIDTH_10 && 175 sband->ht_cap.ht_supported) { 176 struct ieee80211_sta_ht_cap ht_cap; 177 178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 179 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 180 181 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 182 /* 183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 184 * field and RIFS Mode are reserved in IBSS mode, therefore 185 * keep them at 0 186 */ 187 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 188 chandef, 0, false); 189 190 /* add VHT capability and information IEs */ 191 if (chandef->width != NL80211_CHAN_WIDTH_20 && 192 chandef->width != NL80211_CHAN_WIDTH_40 && 193 sband->vht_cap.vht_supported) { 194 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 195 sband->vht_cap.cap); 196 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 197 chandef); 198 } 199 } 200 201 if (local->hw.queues >= IEEE80211_NUM_ACS) 202 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 203 204 presp->head_len = pos - presp->head; 205 if (WARN_ON(presp->head_len > frame_len)) 206 goto error; 207 208 return presp; 209 error: 210 kfree(presp); 211 return NULL; 212 } 213 214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 215 const u8 *bssid, const int beacon_int, 216 struct cfg80211_chan_def *req_chandef, 217 const u32 basic_rates, 218 const u16 capability, u64 tsf, 219 bool creator) 220 { 221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 222 struct ieee80211_local *local = sdata->local; 223 struct ieee80211_mgmt *mgmt; 224 struct cfg80211_bss *bss; 225 u64 bss_change; 226 struct cfg80211_chan_def chandef; 227 struct ieee80211_channel *chan; 228 struct beacon_data *presp; 229 struct cfg80211_inform_bss bss_meta = {}; 230 bool have_higher_than_11mbit; 231 bool radar_required; 232 int err; 233 234 lockdep_assert_wiphy(local->hw.wiphy); 235 236 /* Reset own TSF to allow time synchronization work. */ 237 drv_reset_tsf(local, sdata); 238 239 if (!ether_addr_equal(ifibss->bssid, bssid)) 240 sta_info_flush(sdata); 241 242 /* if merging, indicate to driver that we leave the old IBSS */ 243 if (sdata->vif.cfg.ibss_joined) { 244 sdata->vif.cfg.ibss_joined = false; 245 sdata->vif.cfg.ibss_creator = false; 246 sdata->vif.bss_conf.enable_beacon = false; 247 netif_carrier_off(sdata->dev); 248 ieee80211_bss_info_change_notify(sdata, 249 BSS_CHANGED_IBSS | 250 BSS_CHANGED_BEACON_ENABLED); 251 drv_leave_ibss(local, sdata); 252 } 253 254 presp = sdata_dereference(ifibss->presp, sdata); 255 RCU_INIT_POINTER(ifibss->presp, NULL); 256 if (presp) 257 kfree_rcu(presp, rcu_head); 258 259 /* make a copy of the chandef, it could be modified below. */ 260 chandef = *req_chandef; 261 chan = chandef.chan; 262 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 263 NL80211_IFTYPE_ADHOC)) { 264 if (chandef.width == NL80211_CHAN_WIDTH_5 || 265 chandef.width == NL80211_CHAN_WIDTH_10 || 266 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 267 chandef.width == NL80211_CHAN_WIDTH_20) { 268 sdata_info(sdata, 269 "Failed to join IBSS, beacons forbidden\n"); 270 return; 271 } 272 chandef.width = NL80211_CHAN_WIDTH_20; 273 chandef.center_freq1 = chan->center_freq; 274 /* check again for downgraded chandef */ 275 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 276 NL80211_IFTYPE_ADHOC)) { 277 sdata_info(sdata, 278 "Failed to join IBSS, beacons forbidden\n"); 279 return; 280 } 281 } 282 283 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 284 &chandef, NL80211_IFTYPE_ADHOC); 285 if (err < 0) { 286 sdata_info(sdata, 287 "Failed to join IBSS, invalid chandef\n"); 288 return; 289 } 290 if (err > 0 && !ifibss->userspace_handles_dfs) { 291 sdata_info(sdata, 292 "Failed to join IBSS, DFS channel without control program\n"); 293 return; 294 } 295 296 radar_required = err; 297 298 if (ieee80211_link_use_channel(&sdata->deflink, &chandef, 299 ifibss->fixed_channel ? 300 IEEE80211_CHANCTX_SHARED : 301 IEEE80211_CHANCTX_EXCLUSIVE)) { 302 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 303 return; 304 } 305 sdata->deflink.radar_required = radar_required; 306 307 memcpy(ifibss->bssid, bssid, ETH_ALEN); 308 309 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 310 capability, tsf, &chandef, 311 &have_higher_than_11mbit, NULL); 312 if (!presp) 313 return; 314 315 rcu_assign_pointer(ifibss->presp, presp); 316 mgmt = (void *)presp->head; 317 318 sdata->vif.bss_conf.enable_beacon = true; 319 sdata->vif.bss_conf.beacon_int = beacon_int; 320 sdata->vif.bss_conf.basic_rates = basic_rates; 321 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 322 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 323 bss_change = BSS_CHANGED_BEACON_INT; 324 bss_change |= ieee80211_reset_erp_info(sdata); 325 bss_change |= BSS_CHANGED_BSSID; 326 bss_change |= BSS_CHANGED_BEACON; 327 bss_change |= BSS_CHANGED_BEACON_ENABLED; 328 bss_change |= BSS_CHANGED_BASIC_RATES; 329 bss_change |= BSS_CHANGED_HT; 330 bss_change |= BSS_CHANGED_IBSS; 331 bss_change |= BSS_CHANGED_SSID; 332 333 /* 334 * In 5 GHz/802.11a, we can always use short slot time. 335 * (IEEE 802.11-2012 18.3.8.7) 336 * 337 * In 2.4GHz, we must always use long slots in IBSS for compatibility 338 * reasons. 339 * (IEEE 802.11-2012 19.4.5) 340 * 341 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 342 */ 343 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 344 bss_change |= BSS_CHANGED_ERP_SLOT; 345 346 /* cf. IEEE 802.11 9.2.12 */ 347 sdata->deflink.operating_11g_mode = 348 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 349 350 ieee80211_set_wmm_default(&sdata->deflink, true, false); 351 352 sdata->vif.cfg.ibss_joined = true; 353 sdata->vif.cfg.ibss_creator = creator; 354 355 err = drv_join_ibss(local, sdata); 356 if (err) { 357 sdata->vif.cfg.ibss_joined = false; 358 sdata->vif.cfg.ibss_creator = false; 359 sdata->vif.bss_conf.enable_beacon = false; 360 sdata->vif.cfg.ssid_len = 0; 361 RCU_INIT_POINTER(ifibss->presp, NULL); 362 kfree_rcu(presp, rcu_head); 363 ieee80211_link_release_channel(&sdata->deflink); 364 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 365 err); 366 return; 367 } 368 369 ieee80211_bss_info_change_notify(sdata, bss_change); 370 371 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 372 mod_timer(&ifibss->timer, 373 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 374 375 bss_meta.chan = chan; 376 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 377 presp->head_len, GFP_KERNEL); 378 379 cfg80211_put_bss(local->hw.wiphy, bss); 380 netif_carrier_on(sdata->dev); 381 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 382 } 383 384 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 385 struct ieee80211_bss *bss) 386 { 387 struct cfg80211_bss *cbss = 388 container_of((void *)bss, struct cfg80211_bss, priv); 389 struct ieee80211_supported_band *sband; 390 struct cfg80211_chan_def chandef; 391 u32 basic_rates; 392 int i, j; 393 u16 beacon_int = cbss->beacon_interval; 394 const struct cfg80211_bss_ies *ies; 395 enum nl80211_channel_type chan_type; 396 u64 tsf; 397 u32 rate_flags; 398 399 lockdep_assert_wiphy(sdata->local->hw.wiphy); 400 401 if (beacon_int < 10) 402 beacon_int = 10; 403 404 switch (sdata->u.ibss.chandef.width) { 405 case NL80211_CHAN_WIDTH_20_NOHT: 406 case NL80211_CHAN_WIDTH_20: 407 case NL80211_CHAN_WIDTH_40: 408 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 409 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 410 break; 411 case NL80211_CHAN_WIDTH_5: 412 case NL80211_CHAN_WIDTH_10: 413 cfg80211_chandef_create(&chandef, cbss->channel, 414 NL80211_CHAN_NO_HT); 415 chandef.width = sdata->u.ibss.chandef.width; 416 break; 417 case NL80211_CHAN_WIDTH_80: 418 case NL80211_CHAN_WIDTH_80P80: 419 case NL80211_CHAN_WIDTH_160: 420 chandef = sdata->u.ibss.chandef; 421 chandef.chan = cbss->channel; 422 break; 423 default: 424 /* fall back to 20 MHz for unsupported modes */ 425 cfg80211_chandef_create(&chandef, cbss->channel, 426 NL80211_CHAN_NO_HT); 427 break; 428 } 429 430 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 431 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 432 433 basic_rates = 0; 434 435 for (i = 0; i < bss->supp_rates_len; i++) { 436 int rate = bss->supp_rates[i] & 0x7f; 437 bool is_basic = !!(bss->supp_rates[i] & 0x80); 438 439 for (j = 0; j < sband->n_bitrates; j++) { 440 int brate; 441 if ((rate_flags & sband->bitrates[j].flags) 442 != rate_flags) 443 continue; 444 445 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5); 446 if (brate == rate) { 447 if (is_basic) 448 basic_rates |= BIT(j); 449 break; 450 } 451 } 452 } 453 454 rcu_read_lock(); 455 ies = rcu_dereference(cbss->ies); 456 tsf = ies->tsf; 457 rcu_read_unlock(); 458 459 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 460 beacon_int, 461 &chandef, 462 basic_rates, 463 cbss->capability, 464 tsf, false); 465 } 466 467 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 468 struct cfg80211_csa_settings *csa_settings, 469 u64 *changed) 470 { 471 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 472 struct beacon_data *presp, *old_presp; 473 struct cfg80211_bss *cbss; 474 const struct cfg80211_bss_ies *ies; 475 u16 capability = WLAN_CAPABILITY_IBSS; 476 u64 tsf; 477 478 lockdep_assert_wiphy(sdata->local->hw.wiphy); 479 480 if (ifibss->privacy) 481 capability |= WLAN_CAPABILITY_PRIVACY; 482 483 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 484 ifibss->bssid, ifibss->ssid, 485 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 486 IEEE80211_PRIVACY(ifibss->privacy)); 487 488 if (unlikely(!cbss)) 489 return -EINVAL; 490 491 rcu_read_lock(); 492 ies = rcu_dereference(cbss->ies); 493 tsf = ies->tsf; 494 rcu_read_unlock(); 495 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 496 497 old_presp = sdata_dereference(ifibss->presp, sdata); 498 499 presp = ieee80211_ibss_build_presp(sdata, 500 sdata->vif.bss_conf.beacon_int, 501 sdata->vif.bss_conf.basic_rates, 502 capability, tsf, &ifibss->chandef, 503 NULL, csa_settings); 504 if (!presp) 505 return -ENOMEM; 506 507 rcu_assign_pointer(ifibss->presp, presp); 508 if (old_presp) 509 kfree_rcu(old_presp, rcu_head); 510 511 *changed |= BSS_CHANGED_BEACON; 512 return 0; 513 } 514 515 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 516 { 517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 518 struct cfg80211_bss *cbss; 519 520 lockdep_assert_wiphy(sdata->local->hw.wiphy); 521 522 /* When not connected/joined, sending CSA doesn't make sense. */ 523 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 524 return -ENOLINK; 525 526 /* update cfg80211 bss information with the new channel */ 527 if (!is_zero_ether_addr(ifibss->bssid)) { 528 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 529 ifibss->chandef.chan, 530 ifibss->bssid, ifibss->ssid, 531 ifibss->ssid_len, 532 IEEE80211_BSS_TYPE_IBSS, 533 IEEE80211_PRIVACY(ifibss->privacy)); 534 /* XXX: should not really modify cfg80211 data */ 535 if (cbss) { 536 cbss->channel = sdata->deflink.csa_chandef.chan; 537 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 538 } 539 } 540 541 ifibss->chandef = sdata->deflink.csa_chandef; 542 543 /* generate the beacon */ 544 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 545 } 546 547 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 548 { 549 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 550 551 wiphy_work_cancel(sdata->local->hw.wiphy, 552 &ifibss->csa_connection_drop_work); 553 } 554 555 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 556 __acquires(RCU) 557 { 558 struct ieee80211_sub_if_data *sdata = sta->sdata; 559 u8 addr[ETH_ALEN]; 560 561 memcpy(addr, sta->sta.addr, ETH_ALEN); 562 563 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 564 565 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 566 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 567 /* authorize the station only if the network is not RSN protected. If 568 * not wait for the userspace to authorize it */ 569 if (!sta->sdata->u.ibss.control_port) 570 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 571 572 rate_control_rate_init(sta); 573 574 /* If it fails, maybe we raced another insertion? */ 575 if (sta_info_insert_rcu(sta)) 576 return sta_info_get(sdata, addr); 577 return sta; 578 } 579 580 static struct sta_info * 581 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 582 const u8 *addr, u32 supp_rates) 583 __acquires(RCU) 584 { 585 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 586 struct ieee80211_local *local = sdata->local; 587 struct sta_info *sta; 588 struct ieee80211_chanctx_conf *chanctx_conf; 589 struct ieee80211_supported_band *sband; 590 int band; 591 592 /* 593 * XXX: Consider removing the least recently used entry and 594 * allow new one to be added. 595 */ 596 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 597 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 598 sdata->name, addr); 599 rcu_read_lock(); 600 return NULL; 601 } 602 603 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 604 rcu_read_lock(); 605 return NULL; 606 } 607 608 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 609 rcu_read_lock(); 610 return NULL; 611 } 612 613 rcu_read_lock(); 614 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 615 if (WARN_ON_ONCE(!chanctx_conf)) 616 return NULL; 617 band = chanctx_conf->def.chan->band; 618 rcu_read_unlock(); 619 620 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 621 if (!sta) { 622 rcu_read_lock(); 623 return NULL; 624 } 625 626 /* make sure mandatory rates are always added */ 627 sband = local->hw.wiphy->bands[band]; 628 sta->sta.deflink.supp_rates[band] = supp_rates | 629 ieee80211_mandatory_rates(sband); 630 631 return ieee80211_ibss_finish_sta(sta); 632 } 633 634 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 635 { 636 struct ieee80211_local *local = sdata->local; 637 int active = 0; 638 struct sta_info *sta; 639 640 lockdep_assert_wiphy(sdata->local->hw.wiphy); 641 642 rcu_read_lock(); 643 644 list_for_each_entry_rcu(sta, &local->sta_list, list) { 645 unsigned long last_active = ieee80211_sta_last_active(sta); 646 647 if (sta->sdata == sdata && 648 time_is_after_jiffies(last_active + 649 IEEE80211_IBSS_MERGE_INTERVAL)) { 650 active++; 651 break; 652 } 653 } 654 655 rcu_read_unlock(); 656 657 return active; 658 } 659 660 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 661 { 662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 663 struct ieee80211_local *local = sdata->local; 664 struct cfg80211_bss *cbss; 665 struct beacon_data *presp; 666 struct sta_info *sta; 667 668 lockdep_assert_wiphy(local->hw.wiphy); 669 670 if (!is_zero_ether_addr(ifibss->bssid)) { 671 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 672 ifibss->bssid, ifibss->ssid, 673 ifibss->ssid_len, 674 IEEE80211_BSS_TYPE_IBSS, 675 IEEE80211_PRIVACY(ifibss->privacy)); 676 677 if (cbss) { 678 cfg80211_unlink_bss(local->hw.wiphy, cbss); 679 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 680 } 681 } 682 683 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 684 685 sta_info_flush(sdata); 686 687 spin_lock_bh(&ifibss->incomplete_lock); 688 while (!list_empty(&ifibss->incomplete_stations)) { 689 sta = list_first_entry(&ifibss->incomplete_stations, 690 struct sta_info, list); 691 list_del(&sta->list); 692 spin_unlock_bh(&ifibss->incomplete_lock); 693 694 sta_info_free(local, sta); 695 spin_lock_bh(&ifibss->incomplete_lock); 696 } 697 spin_unlock_bh(&ifibss->incomplete_lock); 698 699 netif_carrier_off(sdata->dev); 700 701 sdata->vif.cfg.ibss_joined = false; 702 sdata->vif.cfg.ibss_creator = false; 703 sdata->vif.bss_conf.enable_beacon = false; 704 sdata->vif.cfg.ssid_len = 0; 705 706 /* remove beacon */ 707 presp = sdata_dereference(ifibss->presp, sdata); 708 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 709 if (presp) 710 kfree_rcu(presp, rcu_head); 711 712 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 713 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 714 BSS_CHANGED_IBSS); 715 drv_leave_ibss(local, sdata); 716 ieee80211_link_release_channel(&sdata->deflink); 717 } 718 719 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 720 struct wiphy_work *work) 721 { 722 struct ieee80211_sub_if_data *sdata = 723 container_of(work, struct ieee80211_sub_if_data, 724 u.ibss.csa_connection_drop_work); 725 726 ieee80211_ibss_disconnect(sdata); 727 synchronize_rcu(); 728 skb_queue_purge(&sdata->skb_queue); 729 730 /* trigger a scan to find another IBSS network to join */ 731 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 732 } 733 734 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 735 { 736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 737 int err; 738 739 /* if the current channel is a DFS channel, mark the channel as 740 * unavailable. 741 */ 742 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 743 &ifibss->chandef, 744 NL80211_IFTYPE_ADHOC); 745 if (err > 0) 746 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 747 GFP_ATOMIC); 748 } 749 750 static bool 751 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 752 struct ieee802_11_elems *elems, 753 bool beacon) 754 { 755 struct cfg80211_csa_settings params; 756 struct ieee80211_csa_ie csa_ie; 757 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 758 enum nl80211_channel_type ch_type; 759 int err; 760 ieee80211_conn_flags_t conn_flags; 761 u32 vht_cap_info = 0; 762 763 lockdep_assert_wiphy(sdata->local->hw.wiphy); 764 765 conn_flags = IEEE80211_CONN_DISABLE_VHT; 766 767 switch (ifibss->chandef.width) { 768 case NL80211_CHAN_WIDTH_5: 769 case NL80211_CHAN_WIDTH_10: 770 case NL80211_CHAN_WIDTH_20_NOHT: 771 conn_flags |= IEEE80211_CONN_DISABLE_HT; 772 fallthrough; 773 case NL80211_CHAN_WIDTH_20: 774 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ; 775 break; 776 default: 777 break; 778 } 779 780 if (elems->vht_cap_elem) 781 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 782 783 memset(¶ms, 0, sizeof(params)); 784 err = ieee80211_parse_ch_switch_ie(sdata, elems, 785 ifibss->chandef.chan->band, 786 vht_cap_info, 787 conn_flags, ifibss->bssid, &csa_ie); 788 /* can't switch to destination channel, fail */ 789 if (err < 0) 790 goto disconnect; 791 792 /* did not contain a CSA */ 793 if (err) 794 return false; 795 796 /* channel switch is not supported, disconnect */ 797 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 798 goto disconnect; 799 800 params.count = csa_ie.count; 801 params.chandef = csa_ie.chandef; 802 803 switch (ifibss->chandef.width) { 804 case NL80211_CHAN_WIDTH_20_NOHT: 805 case NL80211_CHAN_WIDTH_20: 806 case NL80211_CHAN_WIDTH_40: 807 /* keep our current HT mode (HT20/HT40+/HT40-), even if 808 * another mode has been announced. The mode is not adopted 809 * within the beacon while doing CSA and we should therefore 810 * keep the mode which we announce. 811 */ 812 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 813 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 814 ch_type); 815 break; 816 case NL80211_CHAN_WIDTH_5: 817 case NL80211_CHAN_WIDTH_10: 818 if (params.chandef.width != ifibss->chandef.width) { 819 sdata_info(sdata, 820 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 821 ifibss->bssid, 822 params.chandef.chan->center_freq, 823 params.chandef.width, 824 params.chandef.center_freq1, 825 params.chandef.center_freq2); 826 goto disconnect; 827 } 828 break; 829 default: 830 /* should not happen, conn_flags should prevent VHT modes. */ 831 WARN_ON(1); 832 goto disconnect; 833 } 834 835 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 836 NL80211_IFTYPE_ADHOC)) { 837 sdata_info(sdata, 838 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 839 ifibss->bssid, 840 params.chandef.chan->center_freq, 841 params.chandef.width, 842 params.chandef.center_freq1, 843 params.chandef.center_freq2); 844 goto disconnect; 845 } 846 847 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 848 ¶ms.chandef, 849 NL80211_IFTYPE_ADHOC); 850 if (err < 0) 851 goto disconnect; 852 if (err > 0 && !ifibss->userspace_handles_dfs) { 853 /* IBSS-DFS only allowed with a control program */ 854 goto disconnect; 855 } 856 857 params.radar_required = err; 858 859 if (cfg80211_chandef_identical(¶ms.chandef, 860 &sdata->vif.bss_conf.chandef)) { 861 ibss_dbg(sdata, 862 "received csa with an identical chandef, ignoring\n"); 863 return true; 864 } 865 866 /* all checks done, now perform the channel switch. */ 867 ibss_dbg(sdata, 868 "received channel switch announcement to go to channel %d MHz\n", 869 params.chandef.chan->center_freq); 870 871 params.block_tx = !!csa_ie.mode; 872 873 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 874 ¶ms)) 875 goto disconnect; 876 877 ieee80211_ibss_csa_mark_radar(sdata); 878 879 return true; 880 disconnect: 881 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 882 wiphy_work_queue(sdata->local->hw.wiphy, 883 &ifibss->csa_connection_drop_work); 884 885 ieee80211_ibss_csa_mark_radar(sdata); 886 887 return true; 888 } 889 890 static void 891 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 892 struct ieee80211_mgmt *mgmt, size_t len, 893 struct ieee80211_rx_status *rx_status, 894 struct ieee802_11_elems *elems) 895 { 896 int required_len; 897 898 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 899 return; 900 901 /* CSA is the only action we handle for now */ 902 if (mgmt->u.action.u.measurement.action_code != 903 WLAN_ACTION_SPCT_CHL_SWITCH) 904 return; 905 906 required_len = IEEE80211_MIN_ACTION_SIZE + 907 sizeof(mgmt->u.action.u.chan_switch); 908 if (len < required_len) 909 return; 910 911 if (!sdata->vif.bss_conf.csa_active) 912 ieee80211_ibss_process_chanswitch(sdata, elems, false); 913 } 914 915 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 916 struct ieee80211_mgmt *mgmt, 917 size_t len) 918 { 919 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 920 921 if (len < IEEE80211_DEAUTH_FRAME_LEN) 922 return; 923 924 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 925 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 926 sta_info_destroy_addr(sdata, mgmt->sa); 927 } 928 929 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 930 struct ieee80211_mgmt *mgmt, 931 size_t len) 932 { 933 u16 auth_alg, auth_transaction; 934 935 lockdep_assert_wiphy(sdata->local->hw.wiphy); 936 937 if (len < 24 + 6) 938 return; 939 940 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 941 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 942 943 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 944 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 945 mgmt->bssid, auth_transaction); 946 947 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 948 return; 949 950 /* 951 * IEEE 802.11 standard does not require authentication in IBSS 952 * networks and most implementations do not seem to use it. 953 * However, try to reply to authentication attempts if someone 954 * has actually implemented this. 955 */ 956 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 957 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 958 } 959 960 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 961 struct ieee80211_mgmt *mgmt, size_t len, 962 struct ieee80211_rx_status *rx_status, 963 struct ieee802_11_elems *elems, 964 struct ieee80211_channel *channel) 965 { 966 struct sta_info *sta; 967 enum nl80211_band band = rx_status->band; 968 struct ieee80211_local *local = sdata->local; 969 struct ieee80211_supported_band *sband; 970 bool rates_updated = false; 971 u32 supp_rates = 0; 972 973 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 974 return; 975 976 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 977 return; 978 979 sband = local->hw.wiphy->bands[band]; 980 if (WARN_ON(!sband)) 981 return; 982 983 rcu_read_lock(); 984 sta = sta_info_get(sdata, mgmt->sa); 985 986 if (elems->supp_rates) { 987 supp_rates = ieee80211_sta_get_rates(sdata, elems, 988 band, NULL); 989 if (sta) { 990 u32 prev_rates; 991 992 prev_rates = sta->sta.deflink.supp_rates[band]; 993 994 sta->sta.deflink.supp_rates[band] = supp_rates | 995 ieee80211_mandatory_rates(sband); 996 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 997 ibss_dbg(sdata, 998 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 999 sta->sta.addr, prev_rates, 1000 sta->sta.deflink.supp_rates[band]); 1001 rates_updated = true; 1002 } 1003 } else { 1004 rcu_read_unlock(); 1005 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1006 mgmt->sa, supp_rates); 1007 } 1008 } 1009 1010 if (sta && !sta->sta.wme && 1011 (elems->wmm_info || elems->s1g_capab) && 1012 local->hw.queues >= IEEE80211_NUM_ACS) { 1013 sta->sta.wme = true; 1014 ieee80211_check_fast_xmit(sta); 1015 } 1016 1017 if (sta && elems->ht_operation && elems->ht_cap_elem && 1018 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1019 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1021 /* we both use HT */ 1022 struct ieee80211_ht_cap htcap_ie; 1023 struct cfg80211_chan_def chandef; 1024 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1025 1026 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1027 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1028 1029 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1030 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1031 &htcap_ie, 1032 &sta->deflink); 1033 1034 if (elems->vht_operation && elems->vht_cap_elem && 1035 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1037 /* we both use VHT */ 1038 struct ieee80211_vht_cap cap_ie; 1039 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1040 u32 vht_cap_info = 1041 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1042 1043 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1044 elems->vht_operation, 1045 elems->ht_operation, 1046 &chandef); 1047 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1048 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1049 &cap_ie, NULL, 1050 &sta->deflink); 1051 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1052 rates_updated |= true; 1053 } 1054 1055 if (bw != sta->sta.deflink.bandwidth) 1056 rates_updated |= true; 1057 1058 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1059 &chandef)) 1060 WARN_ON_ONCE(1); 1061 } 1062 1063 if (sta && rates_updated) { 1064 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1065 u8 rx_nss = sta->sta.deflink.rx_nss; 1066 1067 /* Force rx_nss recalculation */ 1068 sta->sta.deflink.rx_nss = 0; 1069 rate_control_rate_init(sta); 1070 if (sta->sta.deflink.rx_nss != rx_nss) 1071 changed |= IEEE80211_RC_NSS_CHANGED; 1072 1073 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1074 } 1075 1076 rcu_read_unlock(); 1077 } 1078 1079 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1080 struct ieee80211_mgmt *mgmt, size_t len, 1081 struct ieee80211_rx_status *rx_status, 1082 struct ieee802_11_elems *elems) 1083 { 1084 struct ieee80211_local *local = sdata->local; 1085 struct cfg80211_bss *cbss; 1086 struct ieee80211_bss *bss; 1087 struct ieee80211_channel *channel; 1088 u64 beacon_timestamp, rx_timestamp; 1089 u32 supp_rates = 0; 1090 enum nl80211_band band = rx_status->band; 1091 1092 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1093 if (!channel) 1094 return; 1095 1096 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1097 1098 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1099 if (!bss) 1100 return; 1101 1102 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1103 1104 /* same for beacon and probe response */ 1105 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1106 1107 /* check if we need to merge IBSS */ 1108 1109 /* not an IBSS */ 1110 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1111 goto put_bss; 1112 1113 /* different channel */ 1114 if (sdata->u.ibss.fixed_channel && 1115 sdata->u.ibss.chandef.chan != cbss->channel) 1116 goto put_bss; 1117 1118 /* different SSID */ 1119 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1120 memcmp(elems->ssid, sdata->u.ibss.ssid, 1121 sdata->u.ibss.ssid_len)) 1122 goto put_bss; 1123 1124 /* process channel switch */ 1125 if (sdata->vif.bss_conf.csa_active || 1126 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1127 goto put_bss; 1128 1129 /* same BSSID */ 1130 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1131 goto put_bss; 1132 1133 /* we use a fixed BSSID */ 1134 if (sdata->u.ibss.fixed_bssid) 1135 goto put_bss; 1136 1137 if (ieee80211_have_rx_timestamp(rx_status)) { 1138 /* time when timestamp field was received */ 1139 rx_timestamp = 1140 ieee80211_calculate_rx_timestamp(local, rx_status, 1141 len + FCS_LEN, 24); 1142 } else { 1143 /* 1144 * second best option: get current TSF 1145 * (will return -1 if not supported) 1146 */ 1147 rx_timestamp = drv_get_tsf(local, sdata); 1148 } 1149 1150 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1151 mgmt->sa, mgmt->bssid, 1152 (unsigned long long)rx_timestamp); 1153 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1154 (unsigned long long)beacon_timestamp, 1155 (unsigned long long)(rx_timestamp - beacon_timestamp), 1156 jiffies); 1157 1158 if (beacon_timestamp > rx_timestamp) { 1159 ibss_dbg(sdata, 1160 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1161 mgmt->bssid); 1162 ieee80211_sta_join_ibss(sdata, bss); 1163 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1164 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1165 supp_rates); 1166 rcu_read_unlock(); 1167 } 1168 1169 put_bss: 1170 ieee80211_rx_bss_put(local, bss); 1171 } 1172 1173 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1174 const u8 *bssid, const u8 *addr, 1175 u32 supp_rates) 1176 { 1177 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1178 struct ieee80211_local *local = sdata->local; 1179 struct sta_info *sta; 1180 struct ieee80211_chanctx_conf *chanctx_conf; 1181 struct ieee80211_supported_band *sband; 1182 int band; 1183 1184 /* 1185 * XXX: Consider removing the least recently used entry and 1186 * allow new one to be added. 1187 */ 1188 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1189 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1190 sdata->name, addr); 1191 return; 1192 } 1193 1194 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1195 return; 1196 1197 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1198 return; 1199 1200 rcu_read_lock(); 1201 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1202 if (WARN_ON_ONCE(!chanctx_conf)) { 1203 rcu_read_unlock(); 1204 return; 1205 } 1206 band = chanctx_conf->def.chan->band; 1207 rcu_read_unlock(); 1208 1209 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1210 if (!sta) 1211 return; 1212 1213 /* make sure mandatory rates are always added */ 1214 sband = local->hw.wiphy->bands[band]; 1215 sta->sta.deflink.supp_rates[band] = supp_rates | 1216 ieee80211_mandatory_rates(sband); 1217 1218 spin_lock(&ifibss->incomplete_lock); 1219 list_add(&sta->list, &ifibss->incomplete_stations); 1220 spin_unlock(&ifibss->incomplete_lock); 1221 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1222 } 1223 1224 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1225 { 1226 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1227 struct ieee80211_local *local = sdata->local; 1228 struct sta_info *sta, *tmp; 1229 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1230 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1231 1232 lockdep_assert_wiphy(local->hw.wiphy); 1233 1234 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1235 unsigned long last_active = ieee80211_sta_last_active(sta); 1236 1237 if (sdata != sta->sdata) 1238 continue; 1239 1240 if (time_is_before_jiffies(last_active + exp_time) || 1241 (time_is_before_jiffies(last_active + exp_rsn) && 1242 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1243 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1244 1245 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1246 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1247 "not authorized " : "", sta->sta.addr); 1248 1249 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1250 ifibss->bssid, 1251 IEEE80211_STYPE_DEAUTH, 1252 WLAN_REASON_DEAUTH_LEAVING, 1253 true, frame_buf); 1254 WARN_ON(__sta_info_destroy(sta)); 1255 } 1256 } 1257 } 1258 1259 /* 1260 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1261 */ 1262 1263 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1264 { 1265 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1266 1267 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1268 1269 mod_timer(&ifibss->timer, 1270 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1271 1272 ieee80211_ibss_sta_expire(sdata); 1273 1274 if (time_before(jiffies, ifibss->last_scan_completed + 1275 IEEE80211_IBSS_MERGE_INTERVAL)) 1276 return; 1277 1278 if (ieee80211_sta_active_ibss(sdata)) 1279 return; 1280 1281 if (ifibss->fixed_channel) 1282 return; 1283 1284 sdata_info(sdata, 1285 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1286 1287 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1288 NULL, 0); 1289 } 1290 1291 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1292 { 1293 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1294 u8 bssid[ETH_ALEN]; 1295 u16 capability; 1296 int i; 1297 1298 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1299 1300 if (ifibss->fixed_bssid) { 1301 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1302 } else { 1303 /* Generate random, not broadcast, locally administered BSSID. Mix in 1304 * own MAC address to make sure that devices that do not have proper 1305 * random number generator get different BSSID. */ 1306 get_random_bytes(bssid, ETH_ALEN); 1307 for (i = 0; i < ETH_ALEN; i++) 1308 bssid[i] ^= sdata->vif.addr[i]; 1309 bssid[0] &= ~0x01; 1310 bssid[0] |= 0x02; 1311 } 1312 1313 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1314 1315 capability = WLAN_CAPABILITY_IBSS; 1316 1317 if (ifibss->privacy) 1318 capability |= WLAN_CAPABILITY_PRIVACY; 1319 1320 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1321 &ifibss->chandef, ifibss->basic_rates, 1322 capability, 0, true); 1323 } 1324 1325 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1326 struct ieee80211_channel **channels, 1327 unsigned int channels_max, 1328 u32 center_freq, u32 width) 1329 { 1330 struct ieee80211_channel *chan = NULL; 1331 unsigned int n_chan = 0; 1332 u32 start_freq, end_freq, freq; 1333 1334 if (width <= 20) { 1335 start_freq = center_freq; 1336 end_freq = center_freq; 1337 } else { 1338 start_freq = center_freq - width / 2 + 10; 1339 end_freq = center_freq + width / 2 - 10; 1340 } 1341 1342 for (freq = start_freq; freq <= end_freq; freq += 20) { 1343 chan = ieee80211_get_channel(wiphy, freq); 1344 if (!chan) 1345 continue; 1346 if (n_chan >= channels_max) 1347 return n_chan; 1348 1349 channels[n_chan] = chan; 1350 n_chan++; 1351 } 1352 1353 return n_chan; 1354 } 1355 1356 static unsigned int 1357 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1358 const struct cfg80211_chan_def *chandef, 1359 struct ieee80211_channel **channels, 1360 unsigned int channels_max) 1361 { 1362 unsigned int n_chan = 0; 1363 u32 width, cf1, cf2 = 0; 1364 1365 switch (chandef->width) { 1366 case NL80211_CHAN_WIDTH_40: 1367 width = 40; 1368 break; 1369 case NL80211_CHAN_WIDTH_80P80: 1370 cf2 = chandef->center_freq2; 1371 fallthrough; 1372 case NL80211_CHAN_WIDTH_80: 1373 width = 80; 1374 break; 1375 case NL80211_CHAN_WIDTH_160: 1376 width = 160; 1377 break; 1378 default: 1379 width = 20; 1380 break; 1381 } 1382 1383 cf1 = chandef->center_freq1; 1384 1385 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1386 1387 if (cf2) 1388 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1389 channels_max - n_chan, cf2, 1390 width); 1391 1392 return n_chan; 1393 } 1394 1395 /* 1396 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1397 */ 1398 1399 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1400 { 1401 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1402 struct ieee80211_local *local = sdata->local; 1403 struct cfg80211_bss *cbss; 1404 struct ieee80211_channel *chan = NULL; 1405 const u8 *bssid = NULL; 1406 int active_ibss; 1407 1408 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1409 1410 active_ibss = ieee80211_sta_active_ibss(sdata); 1411 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1412 1413 if (active_ibss) 1414 return; 1415 1416 if (ifibss->fixed_bssid) 1417 bssid = ifibss->bssid; 1418 if (ifibss->fixed_channel) 1419 chan = ifibss->chandef.chan; 1420 if (!is_zero_ether_addr(ifibss->bssid)) 1421 bssid = ifibss->bssid; 1422 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1423 ifibss->ssid, ifibss->ssid_len, 1424 IEEE80211_BSS_TYPE_IBSS, 1425 IEEE80211_PRIVACY(ifibss->privacy)); 1426 1427 if (cbss) { 1428 struct ieee80211_bss *bss; 1429 1430 bss = (void *)cbss->priv; 1431 ibss_dbg(sdata, 1432 "sta_find_ibss: selected %pM current %pM\n", 1433 cbss->bssid, ifibss->bssid); 1434 sdata_info(sdata, 1435 "Selected IBSS BSSID %pM based on configured SSID\n", 1436 cbss->bssid); 1437 1438 ieee80211_sta_join_ibss(sdata, bss); 1439 ieee80211_rx_bss_put(local, bss); 1440 return; 1441 } 1442 1443 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1444 * directly and do not waste time scanning 1445 */ 1446 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1447 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1448 bssid); 1449 ieee80211_sta_create_ibss(sdata); 1450 return; 1451 } 1452 1453 1454 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1455 1456 /* Selected IBSS not found in current scan results - try to scan */ 1457 if (time_after(jiffies, ifibss->last_scan_completed + 1458 IEEE80211_SCAN_INTERVAL)) { 1459 struct ieee80211_channel *channels[8]; 1460 unsigned int num; 1461 1462 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1463 1464 if (ifibss->fixed_channel) { 1465 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1466 &ifibss->chandef, 1467 channels, 1468 ARRAY_SIZE(channels)); 1469 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1470 ifibss->ssid_len, channels, 1471 num); 1472 } else { 1473 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1474 ifibss->ssid_len, NULL, 0); 1475 } 1476 } else { 1477 int interval = IEEE80211_SCAN_INTERVAL; 1478 1479 if (time_after(jiffies, ifibss->ibss_join_req + 1480 IEEE80211_IBSS_JOIN_TIMEOUT)) 1481 ieee80211_sta_create_ibss(sdata); 1482 1483 mod_timer(&ifibss->timer, 1484 round_jiffies(jiffies + interval)); 1485 } 1486 } 1487 1488 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1489 struct sk_buff *req) 1490 { 1491 struct ieee80211_mgmt *mgmt = (void *)req->data; 1492 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1493 struct ieee80211_local *local = sdata->local; 1494 int tx_last_beacon, len = req->len; 1495 struct sk_buff *skb; 1496 struct beacon_data *presp; 1497 u8 *pos, *end; 1498 1499 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1500 1501 presp = sdata_dereference(ifibss->presp, sdata); 1502 1503 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1504 len < 24 + 2 || !presp) 1505 return; 1506 1507 tx_last_beacon = drv_tx_last_beacon(local); 1508 1509 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1510 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1511 mgmt->bssid, tx_last_beacon); 1512 1513 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1514 return; 1515 1516 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1517 !is_broadcast_ether_addr(mgmt->bssid)) 1518 return; 1519 1520 end = ((u8 *) mgmt) + len; 1521 pos = mgmt->u.probe_req.variable; 1522 if (pos[0] != WLAN_EID_SSID || 1523 pos + 2 + pos[1] > end) { 1524 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1525 mgmt->sa); 1526 return; 1527 } 1528 if (pos[1] != 0 && 1529 (pos[1] != ifibss->ssid_len || 1530 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1531 /* Ignore ProbeReq for foreign SSID */ 1532 return; 1533 } 1534 1535 /* Reply with ProbeResp */ 1536 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1537 if (!skb) 1538 return; 1539 1540 skb_reserve(skb, local->tx_headroom); 1541 skb_put_data(skb, presp->head, presp->head_len); 1542 1543 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1544 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1545 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1546 1547 /* avoid excessive retries for probe request to wildcard SSIDs */ 1548 if (pos[1] == 0) 1549 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1550 1551 ieee80211_tx_skb(sdata, skb); 1552 } 1553 1554 static 1555 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1556 struct ieee80211_mgmt *mgmt, size_t len, 1557 struct ieee80211_rx_status *rx_status) 1558 { 1559 size_t baselen; 1560 struct ieee802_11_elems *elems; 1561 1562 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1563 offsetof(typeof(mgmt->u.beacon), variable)); 1564 1565 /* 1566 * either beacon or probe_resp but the variable field is at the 1567 * same offset 1568 */ 1569 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1570 if (baselen > len) 1571 return; 1572 1573 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1574 len - baselen, false, NULL); 1575 1576 if (elems) { 1577 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1578 kfree(elems); 1579 } 1580 } 1581 1582 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1583 struct sk_buff *skb) 1584 { 1585 struct ieee80211_rx_status *rx_status; 1586 struct ieee80211_mgmt *mgmt; 1587 u16 fc; 1588 struct ieee802_11_elems *elems; 1589 int ies_len; 1590 1591 rx_status = IEEE80211_SKB_RXCB(skb); 1592 mgmt = (struct ieee80211_mgmt *) skb->data; 1593 fc = le16_to_cpu(mgmt->frame_control); 1594 1595 if (!sdata->u.ibss.ssid_len) 1596 return; /* not ready to merge yet */ 1597 1598 switch (fc & IEEE80211_FCTL_STYPE) { 1599 case IEEE80211_STYPE_PROBE_REQ: 1600 ieee80211_rx_mgmt_probe_req(sdata, skb); 1601 break; 1602 case IEEE80211_STYPE_PROBE_RESP: 1603 case IEEE80211_STYPE_BEACON: 1604 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1605 rx_status); 1606 break; 1607 case IEEE80211_STYPE_AUTH: 1608 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1609 break; 1610 case IEEE80211_STYPE_DEAUTH: 1611 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1612 break; 1613 case IEEE80211_STYPE_ACTION: 1614 switch (mgmt->u.action.category) { 1615 case WLAN_CATEGORY_SPECTRUM_MGMT: 1616 ies_len = skb->len - 1617 offsetof(struct ieee80211_mgmt, 1618 u.action.u.chan_switch.variable); 1619 1620 if (ies_len < 0) 1621 break; 1622 1623 elems = ieee802_11_parse_elems( 1624 mgmt->u.action.u.chan_switch.variable, 1625 ies_len, true, NULL); 1626 1627 if (elems && !elems->parse_error) 1628 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1629 skb->len, 1630 rx_status, 1631 elems); 1632 kfree(elems); 1633 break; 1634 } 1635 } 1636 } 1637 1638 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1639 { 1640 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1641 struct sta_info *sta; 1642 1643 /* 1644 * Work could be scheduled after scan or similar 1645 * when we aren't even joined (or trying) with a 1646 * network. 1647 */ 1648 if (!ifibss->ssid_len) 1649 return; 1650 1651 spin_lock_bh(&ifibss->incomplete_lock); 1652 while (!list_empty(&ifibss->incomplete_stations)) { 1653 sta = list_first_entry(&ifibss->incomplete_stations, 1654 struct sta_info, list); 1655 list_del(&sta->list); 1656 spin_unlock_bh(&ifibss->incomplete_lock); 1657 1658 ieee80211_ibss_finish_sta(sta); 1659 rcu_read_unlock(); 1660 spin_lock_bh(&ifibss->incomplete_lock); 1661 } 1662 spin_unlock_bh(&ifibss->incomplete_lock); 1663 1664 switch (ifibss->state) { 1665 case IEEE80211_IBSS_MLME_SEARCH: 1666 ieee80211_sta_find_ibss(sdata); 1667 break; 1668 case IEEE80211_IBSS_MLME_JOINED: 1669 ieee80211_sta_merge_ibss(sdata); 1670 break; 1671 default: 1672 WARN_ON(1); 1673 break; 1674 } 1675 } 1676 1677 static void ieee80211_ibss_timer(struct timer_list *t) 1678 { 1679 struct ieee80211_sub_if_data *sdata = 1680 from_timer(sdata, t, u.ibss.timer); 1681 1682 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1683 } 1684 1685 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1686 { 1687 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1688 1689 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1690 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1691 spin_lock_init(&ifibss->incomplete_lock); 1692 wiphy_work_init(&ifibss->csa_connection_drop_work, 1693 ieee80211_csa_connection_drop_work); 1694 } 1695 1696 /* scan finished notification */ 1697 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1698 { 1699 struct ieee80211_sub_if_data *sdata; 1700 1701 lockdep_assert_wiphy(local->hw.wiphy); 1702 1703 list_for_each_entry(sdata, &local->interfaces, list) { 1704 if (!ieee80211_sdata_running(sdata)) 1705 continue; 1706 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1707 continue; 1708 sdata->u.ibss.last_scan_completed = jiffies; 1709 } 1710 } 1711 1712 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1713 struct cfg80211_ibss_params *params) 1714 { 1715 u64 changed = 0; 1716 u32 rate_flags; 1717 struct ieee80211_supported_band *sband; 1718 enum ieee80211_chanctx_mode chanmode; 1719 struct ieee80211_local *local = sdata->local; 1720 int radar_detect_width = 0; 1721 int i; 1722 int ret; 1723 1724 lockdep_assert_wiphy(local->hw.wiphy); 1725 1726 if (params->chandef.chan->freq_offset) { 1727 /* this may work, but is untested */ 1728 return -EOPNOTSUPP; 1729 } 1730 1731 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1732 ¶ms->chandef, 1733 sdata->wdev.iftype); 1734 if (ret < 0) 1735 return ret; 1736 1737 if (ret > 0) { 1738 if (!params->userspace_handles_dfs) 1739 return -EINVAL; 1740 radar_detect_width = BIT(params->chandef.width); 1741 } 1742 1743 chanmode = (params->channel_fixed && !ret) ? 1744 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1745 1746 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1747 radar_detect_width); 1748 if (ret < 0) 1749 return ret; 1750 1751 if (params->bssid) { 1752 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1753 sdata->u.ibss.fixed_bssid = true; 1754 } else 1755 sdata->u.ibss.fixed_bssid = false; 1756 1757 sdata->u.ibss.privacy = params->privacy; 1758 sdata->u.ibss.control_port = params->control_port; 1759 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1760 sdata->u.ibss.basic_rates = params->basic_rates; 1761 sdata->u.ibss.last_scan_completed = jiffies; 1762 1763 /* fix basic_rates if channel does not support these rates */ 1764 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1765 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1766 for (i = 0; i < sband->n_bitrates; i++) { 1767 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1768 sdata->u.ibss.basic_rates &= ~BIT(i); 1769 } 1770 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1771 sizeof(params->mcast_rate)); 1772 1773 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1774 1775 sdata->u.ibss.chandef = params->chandef; 1776 sdata->u.ibss.fixed_channel = params->channel_fixed; 1777 1778 if (params->ie) { 1779 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1780 GFP_KERNEL); 1781 if (sdata->u.ibss.ie) 1782 sdata->u.ibss.ie_len = params->ie_len; 1783 } 1784 1785 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1786 sdata->u.ibss.ibss_join_req = jiffies; 1787 1788 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1789 sdata->u.ibss.ssid_len = params->ssid_len; 1790 1791 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1792 sizeof(sdata->u.ibss.ht_capa)); 1793 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1794 sizeof(sdata->u.ibss.ht_capa_mask)); 1795 1796 /* 1797 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1798 * reserved, but an HT STA shall protect HT transmissions as though 1799 * the HT Protection field were set to non-HT mixed mode. 1800 * 1801 * In an IBSS, the RIFS Mode field of the HT Operation element is 1802 * also reserved, but an HT STA shall operate as though this field 1803 * were set to 1. 1804 */ 1805 1806 sdata->vif.bss_conf.ht_operation_mode |= 1807 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1808 | IEEE80211_HT_PARAM_RIFS_MODE; 1809 1810 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1811 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1812 1813 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1814 sdata->deflink.needed_rx_chains = local->rx_chains; 1815 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1816 1817 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1818 1819 return 0; 1820 } 1821 1822 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1823 { 1824 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1825 1826 ieee80211_ibss_disconnect(sdata); 1827 ifibss->ssid_len = 0; 1828 eth_zero_addr(ifibss->bssid); 1829 1830 /* remove beacon */ 1831 kfree(sdata->u.ibss.ie); 1832 sdata->u.ibss.ie = NULL; 1833 sdata->u.ibss.ie_len = 0; 1834 1835 /* on the next join, re-program HT parameters */ 1836 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1837 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1838 1839 synchronize_rcu(); 1840 1841 skb_queue_purge(&sdata->skb_queue); 1842 1843 del_timer_sync(&sdata->u.ibss.timer); 1844 1845 return 0; 1846 } 1847