ibss.c revision 93c75786e8d8e8e245a479209a84b19292d08e7e
1/* 2 * IBSS mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 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 34#define IEEE80211_IBSS_MAX_STA_ENTRIES 128 35 36 37static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 38 const u8 *bssid, const int beacon_int, 39 struct ieee80211_channel *chan, 40 const u32 basic_rates, 41 const u16 capability, u64 tsf, 42 bool creator) 43{ 44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 45 struct ieee80211_local *local = sdata->local; 46 int rates_n = 0, i, ri; 47 struct ieee80211_mgmt *mgmt; 48 u8 *pos; 49 struct ieee80211_supported_band *sband; 50 struct cfg80211_bss *bss; 51 u32 bss_change, rate_flags, rates = 0, rates_added = 0; 52 struct cfg80211_chan_def chandef; 53 enum nl80211_bss_scan_width scan_width; 54 bool have_higher_than_11mbit = false; 55 struct beacon_data *presp; 56 int frame_len; 57 int shift; 58 59 sdata_assert_lock(sdata); 60 61 /* Reset own TSF to allow time synchronization work. */ 62 drv_reset_tsf(local, sdata); 63 64 if (!ether_addr_equal(ifibss->bssid, bssid)) 65 sta_info_flush(sdata); 66 67 /* if merging, indicate to driver that we leave the old IBSS */ 68 if (sdata->vif.bss_conf.ibss_joined) { 69 sdata->vif.bss_conf.ibss_joined = false; 70 sdata->vif.bss_conf.ibss_creator = false; 71 sdata->vif.bss_conf.enable_beacon = false; 72 netif_carrier_off(sdata->dev); 73 ieee80211_bss_info_change_notify(sdata, 74 BSS_CHANGED_IBSS | 75 BSS_CHANGED_BEACON_ENABLED); 76 } 77 78 presp = rcu_dereference_protected(ifibss->presp, 79 lockdep_is_held(&sdata->wdev.mtx)); 80 rcu_assign_pointer(ifibss->presp, NULL); 81 if (presp) 82 kfree_rcu(presp, rcu_head); 83 84 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; 85 86 chandef = ifibss->chandef; 87 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { 88 if (chandef.width == NL80211_CHAN_WIDTH_5 || 89 chandef.width == NL80211_CHAN_WIDTH_10 || 90 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 91 chandef.width == NL80211_CHAN_WIDTH_20) { 92 sdata_info(sdata, 93 "Failed to join IBSS, beacons forbidden\n"); 94 return; 95 } 96 chandef.width = NL80211_CHAN_WIDTH_20; 97 chandef.center_freq1 = chan->center_freq; 98 } 99 100 ieee80211_vif_release_channel(sdata); 101 if (ieee80211_vif_use_channel(sdata, &chandef, 102 ifibss->fixed_channel ? 103 IEEE80211_CHANCTX_SHARED : 104 IEEE80211_CHANCTX_EXCLUSIVE)) { 105 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 106 return; 107 } 108 109 memcpy(ifibss->bssid, bssid, ETH_ALEN); 110 111 sband = local->hw.wiphy->bands[chan->band]; 112 shift = ieee80211_vif_get_shift(&sdata->vif); 113 114 /* Build IBSS probe response */ 115 frame_len = sizeof(struct ieee80211_hdr_3addr) + 116 12 /* struct ieee80211_mgmt.u.beacon */ + 117 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 118 2 + 8 /* max Supported Rates */ + 119 3 /* max DS params */ + 120 4 /* IBSS params */ + 121 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 122 2 + sizeof(struct ieee80211_ht_cap) + 123 2 + sizeof(struct ieee80211_ht_operation) + 124 ifibss->ie_len; 125 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 126 if (!presp) 127 return; 128 129 presp->head = (void *)(presp + 1); 130 131 mgmt = (void *) presp->head; 132 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 133 IEEE80211_STYPE_PROBE_RESP); 134 eth_broadcast_addr(mgmt->da); 135 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 136 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 137 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 138 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 139 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 140 141 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 142 143 *pos++ = WLAN_EID_SSID; 144 *pos++ = ifibss->ssid_len; 145 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 146 pos += ifibss->ssid_len; 147 148 rate_flags = ieee80211_chandef_rate_flags(&chandef); 149 for (i = 0; i < sband->n_bitrates; i++) { 150 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 151 continue; 152 if (sband->bitrates[i].bitrate > 110) 153 have_higher_than_11mbit = true; 154 155 rates |= BIT(i); 156 rates_n++; 157 } 158 159 *pos++ = WLAN_EID_SUPP_RATES; 160 *pos++ = min_t(int, 8, rates_n); 161 for (ri = 0; ri < sband->n_bitrates; ri++) { 162 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 163 5 * (1 << shift)); 164 u8 basic = 0; 165 if (!(rates & BIT(ri))) 166 continue; 167 168 if (basic_rates & BIT(ri)) 169 basic = 0x80; 170 *pos++ = basic | (u8) rate; 171 if (++rates_added == 8) { 172 ri++; /* continue at next rate for EXT_SUPP_RATES */ 173 break; 174 } 175 } 176 177 if (sband->band == IEEE80211_BAND_2GHZ) { 178 *pos++ = WLAN_EID_DS_PARAMS; 179 *pos++ = 1; 180 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 181 } 182 183 *pos++ = WLAN_EID_IBSS_PARAMS; 184 *pos++ = 2; 185 /* FIX: set ATIM window based on scan results */ 186 *pos++ = 0; 187 *pos++ = 0; 188 189 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 190 if (rates_n > 8) { 191 *pos++ = WLAN_EID_EXT_SUPP_RATES; 192 *pos++ = rates_n - 8; 193 for (; ri < sband->n_bitrates; ri++) { 194 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 195 5 * (1 << shift)); 196 u8 basic = 0; 197 if (!(rates & BIT(ri))) 198 continue; 199 200 if (basic_rates & BIT(ri)) 201 basic = 0x80; 202 *pos++ = basic | (u8) rate; 203 } 204 } 205 206 if (ifibss->ie_len) { 207 memcpy(pos, ifibss->ie, ifibss->ie_len); 208 pos += ifibss->ie_len; 209 } 210 211 /* add HT capability and information IEs */ 212 if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 213 chandef.width != NL80211_CHAN_WIDTH_5 && 214 chandef.width != NL80211_CHAN_WIDTH_10 && 215 sband->ht_cap.ht_supported) { 216 struct ieee80211_sta_ht_cap ht_cap; 217 218 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 219 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 220 221 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 222 /* 223 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 224 * field and RIFS Mode are reserved in IBSS mode, therefore 225 * keep them at 0 226 */ 227 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 228 &chandef, 0); 229 } 230 231 if (local->hw.queues >= IEEE80211_NUM_ACS) { 232 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 233 *pos++ = 7; /* len */ 234 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 235 *pos++ = 0x50; 236 *pos++ = 0xf2; 237 *pos++ = 2; /* WME */ 238 *pos++ = 0; /* WME info */ 239 *pos++ = 1; /* WME ver */ 240 *pos++ = 0; /* U-APSD no in use */ 241 } 242 243 presp->head_len = pos - presp->head; 244 if (WARN_ON(presp->head_len > frame_len)) 245 return; 246 247 rcu_assign_pointer(ifibss->presp, presp); 248 249 sdata->vif.bss_conf.enable_beacon = true; 250 sdata->vif.bss_conf.beacon_int = beacon_int; 251 sdata->vif.bss_conf.basic_rates = basic_rates; 252 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 253 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 254 bss_change = BSS_CHANGED_BEACON_INT; 255 bss_change |= ieee80211_reset_erp_info(sdata); 256 bss_change |= BSS_CHANGED_BSSID; 257 bss_change |= BSS_CHANGED_BEACON; 258 bss_change |= BSS_CHANGED_BEACON_ENABLED; 259 bss_change |= BSS_CHANGED_BASIC_RATES; 260 bss_change |= BSS_CHANGED_HT; 261 bss_change |= BSS_CHANGED_IBSS; 262 bss_change |= BSS_CHANGED_SSID; 263 264 /* 265 * In 5 GHz/802.11a, we can always use short slot time. 266 * (IEEE 802.11-2012 18.3.8.7) 267 * 268 * In 2.4GHz, we must always use long slots in IBSS for compatibility 269 * reasons. 270 * (IEEE 802.11-2012 19.4.5) 271 * 272 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 273 */ 274 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; 275 bss_change |= BSS_CHANGED_ERP_SLOT; 276 277 /* cf. IEEE 802.11 9.2.12 */ 278 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 279 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 280 else 281 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 282 283 sdata->vif.bss_conf.ibss_joined = true; 284 sdata->vif.bss_conf.ibss_creator = creator; 285 ieee80211_bss_info_change_notify(sdata, bss_change); 286 287 ieee80211_set_wmm_default(sdata, true); 288 289 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 290 mod_timer(&ifibss->timer, 291 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 292 293 scan_width = cfg80211_chandef_to_scan_width(&chandef); 294 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, 295 scan_width, mgmt, 296 presp->head_len, 0, GFP_KERNEL); 297 cfg80211_put_bss(local->hw.wiphy, bss); 298 netif_carrier_on(sdata->dev); 299 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); 300} 301 302static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 303 struct ieee80211_bss *bss) 304{ 305 struct cfg80211_bss *cbss = 306 container_of((void *)bss, struct cfg80211_bss, priv); 307 struct ieee80211_supported_band *sband; 308 u32 basic_rates; 309 int i, j; 310 u16 beacon_int = cbss->beacon_interval; 311 const struct cfg80211_bss_ies *ies; 312 u64 tsf; 313 u32 rate_flags; 314 int shift; 315 316 sdata_assert_lock(sdata); 317 318 if (beacon_int < 10) 319 beacon_int = 10; 320 321 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 322 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 323 shift = ieee80211_vif_get_shift(&sdata->vif); 324 325 basic_rates = 0; 326 327 for (i = 0; i < bss->supp_rates_len; i++) { 328 int rate = bss->supp_rates[i] & 0x7f; 329 bool is_basic = !!(bss->supp_rates[i] & 0x80); 330 331 for (j = 0; j < sband->n_bitrates; j++) { 332 int brate; 333 if ((rate_flags & sband->bitrates[j].flags) 334 != rate_flags) 335 continue; 336 337 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 338 5 * (1 << shift)); 339 if (brate == rate) { 340 if (is_basic) 341 basic_rates |= BIT(j); 342 break; 343 } 344 } 345 } 346 347 rcu_read_lock(); 348 ies = rcu_dereference(cbss->ies); 349 tsf = ies->tsf; 350 rcu_read_unlock(); 351 352 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 353 beacon_int, 354 cbss->channel, 355 basic_rates, 356 cbss->capability, 357 tsf, false); 358} 359 360static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 361 __acquires(RCU) 362{ 363 struct ieee80211_sub_if_data *sdata = sta->sdata; 364 u8 addr[ETH_ALEN]; 365 366 memcpy(addr, sta->sta.addr, ETH_ALEN); 367 368 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 369 370 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 371 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 372 /* authorize the station only if the network is not RSN protected. If 373 * not wait for the userspace to authorize it */ 374 if (!sta->sdata->u.ibss.control_port) 375 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 376 377 rate_control_rate_init(sta); 378 379 /* If it fails, maybe we raced another insertion? */ 380 if (sta_info_insert_rcu(sta)) 381 return sta_info_get(sdata, addr); 382 return sta; 383} 384 385static struct sta_info * 386ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 387 const u8 *addr, u32 supp_rates) 388 __acquires(RCU) 389{ 390 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 391 struct ieee80211_local *local = sdata->local; 392 struct sta_info *sta; 393 struct ieee80211_chanctx_conf *chanctx_conf; 394 struct ieee80211_supported_band *sband; 395 enum nl80211_bss_scan_width scan_width; 396 int band; 397 398 /* 399 * XXX: Consider removing the least recently used entry and 400 * allow new one to be added. 401 */ 402 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 403 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 404 sdata->name, addr); 405 rcu_read_lock(); 406 return NULL; 407 } 408 409 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 410 rcu_read_lock(); 411 return NULL; 412 } 413 414 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 415 rcu_read_lock(); 416 return NULL; 417 } 418 419 rcu_read_lock(); 420 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 421 if (WARN_ON_ONCE(!chanctx_conf)) 422 return NULL; 423 band = chanctx_conf->def.chan->band; 424 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 425 rcu_read_unlock(); 426 427 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 428 if (!sta) { 429 rcu_read_lock(); 430 return NULL; 431 } 432 433 sta->last_rx = jiffies; 434 435 /* make sure mandatory rates are always added */ 436 sband = local->hw.wiphy->bands[band]; 437 sta->sta.supp_rates[band] = supp_rates | 438 ieee80211_mandatory_rates(sband, scan_width); 439 440 return ieee80211_ibss_finish_sta(sta); 441} 442 443static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 444 struct ieee80211_mgmt *mgmt, 445 size_t len) 446{ 447 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 448 449 if (len < IEEE80211_DEAUTH_FRAME_LEN) 450 return; 451 452 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 453 mgmt->sa, mgmt->da, mgmt->bssid, reason); 454 sta_info_destroy_addr(sdata, mgmt->sa); 455} 456 457static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 458 struct ieee80211_mgmt *mgmt, 459 size_t len) 460{ 461 u16 auth_alg, auth_transaction; 462 463 sdata_assert_lock(sdata); 464 465 if (len < 24 + 6) 466 return; 467 468 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 469 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 470 471 ibss_dbg(sdata, 472 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 473 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 474 475 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 476 return; 477 478 /* 479 * IEEE 802.11 standard does not require authentication in IBSS 480 * networks and most implementations do not seem to use it. 481 * However, try to reply to authentication attempts if someone 482 * has actually implemented this. 483 */ 484 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 485 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 486} 487 488static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 489 struct ieee80211_mgmt *mgmt, size_t len, 490 struct ieee80211_rx_status *rx_status, 491 struct ieee802_11_elems *elems) 492{ 493 struct ieee80211_local *local = sdata->local; 494 int freq; 495 struct cfg80211_bss *cbss; 496 struct ieee80211_bss *bss; 497 struct sta_info *sta; 498 struct ieee80211_channel *channel; 499 u64 beacon_timestamp, rx_timestamp; 500 u32 supp_rates = 0; 501 enum ieee80211_band band = rx_status->band; 502 enum nl80211_bss_scan_width scan_width; 503 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 504 bool rates_updated = false; 505 506 if (elems->ds_params) 507 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 508 band); 509 else 510 freq = rx_status->freq; 511 512 channel = ieee80211_get_channel(local->hw.wiphy, freq); 513 514 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 515 return; 516 517 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 518 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { 519 520 rcu_read_lock(); 521 sta = sta_info_get(sdata, mgmt->sa); 522 523 if (elems->supp_rates) { 524 supp_rates = ieee80211_sta_get_rates(sdata, elems, 525 band, NULL); 526 if (sta) { 527 u32 prev_rates; 528 529 prev_rates = sta->sta.supp_rates[band]; 530 /* make sure mandatory rates are always added */ 531 scan_width = NL80211_BSS_CHAN_WIDTH_20; 532 if (rx_status->flag & RX_FLAG_5MHZ) 533 scan_width = NL80211_BSS_CHAN_WIDTH_5; 534 if (rx_status->flag & RX_FLAG_10MHZ) 535 scan_width = NL80211_BSS_CHAN_WIDTH_10; 536 537 sta->sta.supp_rates[band] = supp_rates | 538 ieee80211_mandatory_rates(sband, 539 scan_width); 540 if (sta->sta.supp_rates[band] != prev_rates) { 541 ibss_dbg(sdata, 542 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 543 sta->sta.addr, prev_rates, 544 sta->sta.supp_rates[band]); 545 rates_updated = true; 546 } 547 } else { 548 rcu_read_unlock(); 549 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 550 mgmt->sa, supp_rates); 551 } 552 } 553 554 if (sta && elems->wmm_info) 555 set_sta_flag(sta, WLAN_STA_WME); 556 557 if (sta && elems->ht_operation && elems->ht_cap_elem && 558 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 559 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 560 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 561 /* we both use HT */ 562 struct ieee80211_ht_cap htcap_ie; 563 struct cfg80211_chan_def chandef; 564 565 ieee80211_ht_oper_to_chandef(channel, 566 elems->ht_operation, 567 &chandef); 568 569 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 570 571 /* 572 * fall back to HT20 if we don't use or use 573 * the other extension channel 574 */ 575 if (chandef.center_freq1 != 576 sdata->u.ibss.chandef.center_freq1) 577 htcap_ie.cap_info &= 578 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); 579 580 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( 581 sdata, sband, &htcap_ie, sta); 582 } 583 584 if (sta && rates_updated) { 585 drv_sta_rc_update(local, sdata, &sta->sta, 586 IEEE80211_RC_SUPP_RATES_CHANGED); 587 rate_control_rate_init(sta); 588 } 589 590 rcu_read_unlock(); 591 } 592 593 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 594 channel); 595 if (!bss) 596 return; 597 598 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 599 600 /* same for beacon and probe response */ 601 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 602 603 /* check if we need to merge IBSS */ 604 605 /* we use a fixed BSSID */ 606 if (sdata->u.ibss.fixed_bssid) 607 goto put_bss; 608 609 /* not an IBSS */ 610 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 611 goto put_bss; 612 613 /* different channel */ 614 if (sdata->u.ibss.fixed_channel && 615 sdata->u.ibss.chandef.chan != cbss->channel) 616 goto put_bss; 617 618 /* different SSID */ 619 if (elems->ssid_len != sdata->u.ibss.ssid_len || 620 memcmp(elems->ssid, sdata->u.ibss.ssid, 621 sdata->u.ibss.ssid_len)) 622 goto put_bss; 623 624 /* same BSSID */ 625 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 626 goto put_bss; 627 628 if (ieee80211_have_rx_timestamp(rx_status)) { 629 /* time when timestamp field was received */ 630 rx_timestamp = 631 ieee80211_calculate_rx_timestamp(local, rx_status, 632 len + FCS_LEN, 24); 633 } else { 634 /* 635 * second best option: get current TSF 636 * (will return -1 if not supported) 637 */ 638 rx_timestamp = drv_get_tsf(local, sdata); 639 } 640 641 ibss_dbg(sdata, 642 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 643 mgmt->sa, mgmt->bssid, 644 (unsigned long long)rx_timestamp, 645 (unsigned long long)beacon_timestamp, 646 (unsigned long long)(rx_timestamp - beacon_timestamp), 647 jiffies); 648 649 if (beacon_timestamp > rx_timestamp) { 650 ibss_dbg(sdata, 651 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 652 mgmt->bssid); 653 ieee80211_sta_join_ibss(sdata, bss); 654 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 655 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 656 supp_rates); 657 rcu_read_unlock(); 658 } 659 660 put_bss: 661 ieee80211_rx_bss_put(local, bss); 662} 663 664void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 665 const u8 *bssid, const u8 *addr, 666 u32 supp_rates) 667{ 668 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 669 struct ieee80211_local *local = sdata->local; 670 struct sta_info *sta; 671 struct ieee80211_chanctx_conf *chanctx_conf; 672 struct ieee80211_supported_band *sband; 673 enum nl80211_bss_scan_width scan_width; 674 int band; 675 676 /* 677 * XXX: Consider removing the least recently used entry and 678 * allow new one to be added. 679 */ 680 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 681 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 682 sdata->name, addr); 683 return; 684 } 685 686 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 687 return; 688 689 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 690 return; 691 692 rcu_read_lock(); 693 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 694 if (WARN_ON_ONCE(!chanctx_conf)) { 695 rcu_read_unlock(); 696 return; 697 } 698 band = chanctx_conf->def.chan->band; 699 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 700 rcu_read_unlock(); 701 702 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 703 if (!sta) 704 return; 705 706 sta->last_rx = jiffies; 707 708 /* make sure mandatory rates are always added */ 709 sband = local->hw.wiphy->bands[band]; 710 sta->sta.supp_rates[band] = supp_rates | 711 ieee80211_mandatory_rates(sband, scan_width); 712 713 spin_lock(&ifibss->incomplete_lock); 714 list_add(&sta->list, &ifibss->incomplete_stations); 715 spin_unlock(&ifibss->incomplete_lock); 716 ieee80211_queue_work(&local->hw, &sdata->work); 717} 718 719static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 720{ 721 struct ieee80211_local *local = sdata->local; 722 int active = 0; 723 struct sta_info *sta; 724 725 sdata_assert_lock(sdata); 726 727 rcu_read_lock(); 728 729 list_for_each_entry_rcu(sta, &local->sta_list, list) { 730 if (sta->sdata == sdata && 731 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 732 jiffies)) { 733 active++; 734 break; 735 } 736 } 737 738 rcu_read_unlock(); 739 740 return active; 741} 742 743/* 744 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 745 */ 746 747static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 748{ 749 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 750 enum nl80211_bss_scan_width scan_width; 751 752 sdata_assert_lock(sdata); 753 754 mod_timer(&ifibss->timer, 755 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 756 757 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); 758 759 if (time_before(jiffies, ifibss->last_scan_completed + 760 IEEE80211_IBSS_MERGE_INTERVAL)) 761 return; 762 763 if (ieee80211_sta_active_ibss(sdata)) 764 return; 765 766 if (ifibss->fixed_channel) 767 return; 768 769 sdata_info(sdata, 770 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 771 772 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 773 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 774 NULL, scan_width); 775} 776 777static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 778{ 779 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 780 u8 bssid[ETH_ALEN]; 781 u16 capability; 782 int i; 783 784 sdata_assert_lock(sdata); 785 786 if (ifibss->fixed_bssid) { 787 memcpy(bssid, ifibss->bssid, ETH_ALEN); 788 } else { 789 /* Generate random, not broadcast, locally administered BSSID. Mix in 790 * own MAC address to make sure that devices that do not have proper 791 * random number generator get different BSSID. */ 792 get_random_bytes(bssid, ETH_ALEN); 793 for (i = 0; i < ETH_ALEN; i++) 794 bssid[i] ^= sdata->vif.addr[i]; 795 bssid[0] &= ~0x01; 796 bssid[0] |= 0x02; 797 } 798 799 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 800 801 capability = WLAN_CAPABILITY_IBSS; 802 803 if (ifibss->privacy) 804 capability |= WLAN_CAPABILITY_PRIVACY; 805 else 806 sdata->drop_unencrypted = 0; 807 808 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 809 ifibss->chandef.chan, ifibss->basic_rates, 810 capability, 0, true); 811} 812 813/* 814 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 815 */ 816 817static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 818{ 819 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 820 struct ieee80211_local *local = sdata->local; 821 struct cfg80211_bss *cbss; 822 struct ieee80211_channel *chan = NULL; 823 const u8 *bssid = NULL; 824 enum nl80211_bss_scan_width scan_width; 825 int active_ibss; 826 u16 capability; 827 828 sdata_assert_lock(sdata); 829 830 active_ibss = ieee80211_sta_active_ibss(sdata); 831 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 832 833 if (active_ibss) 834 return; 835 836 capability = WLAN_CAPABILITY_IBSS; 837 if (ifibss->privacy) 838 capability |= WLAN_CAPABILITY_PRIVACY; 839 if (ifibss->fixed_bssid) 840 bssid = ifibss->bssid; 841 if (ifibss->fixed_channel) 842 chan = ifibss->chandef.chan; 843 if (!is_zero_ether_addr(ifibss->bssid)) 844 bssid = ifibss->bssid; 845 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 846 ifibss->ssid, ifibss->ssid_len, 847 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, 848 capability); 849 850 if (cbss) { 851 struct ieee80211_bss *bss; 852 853 bss = (void *)cbss->priv; 854 ibss_dbg(sdata, 855 "sta_find_ibss: selected %pM current %pM\n", 856 cbss->bssid, ifibss->bssid); 857 sdata_info(sdata, 858 "Selected IBSS BSSID %pM based on configured SSID\n", 859 cbss->bssid); 860 861 ieee80211_sta_join_ibss(sdata, bss); 862 ieee80211_rx_bss_put(local, bss); 863 return; 864 } 865 866 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 867 868 /* Selected IBSS not found in current scan results - try to scan */ 869 if (time_after(jiffies, ifibss->last_scan_completed + 870 IEEE80211_SCAN_INTERVAL)) { 871 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 872 873 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 874 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 875 ifibss->ssid_len, chan, 876 scan_width); 877 } else { 878 int interval = IEEE80211_SCAN_INTERVAL; 879 880 if (time_after(jiffies, ifibss->ibss_join_req + 881 IEEE80211_IBSS_JOIN_TIMEOUT)) 882 ieee80211_sta_create_ibss(sdata); 883 884 mod_timer(&ifibss->timer, 885 round_jiffies(jiffies + interval)); 886 } 887} 888 889static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 890 struct sk_buff *req) 891{ 892 struct ieee80211_mgmt *mgmt = (void *)req->data; 893 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 894 struct ieee80211_local *local = sdata->local; 895 int tx_last_beacon, len = req->len; 896 struct sk_buff *skb; 897 struct beacon_data *presp; 898 u8 *pos, *end; 899 900 sdata_assert_lock(sdata); 901 902 presp = rcu_dereference_protected(ifibss->presp, 903 lockdep_is_held(&sdata->wdev.mtx)); 904 905 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 906 len < 24 + 2 || !presp) 907 return; 908 909 tx_last_beacon = drv_tx_last_beacon(local); 910 911 ibss_dbg(sdata, 912 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 913 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 914 915 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 916 return; 917 918 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 919 !is_broadcast_ether_addr(mgmt->bssid)) 920 return; 921 922 end = ((u8 *) mgmt) + len; 923 pos = mgmt->u.probe_req.variable; 924 if (pos[0] != WLAN_EID_SSID || 925 pos + 2 + pos[1] > end) { 926 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 927 mgmt->sa); 928 return; 929 } 930 if (pos[1] != 0 && 931 (pos[1] != ifibss->ssid_len || 932 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 933 /* Ignore ProbeReq for foreign SSID */ 934 return; 935 } 936 937 /* Reply with ProbeResp */ 938 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 939 if (!skb) 940 return; 941 942 skb_reserve(skb, local->tx_headroom); 943 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 944 945 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 946 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 947 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 948 ieee80211_tx_skb(sdata, skb); 949} 950 951static 952void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 953 struct ieee80211_mgmt *mgmt, size_t len, 954 struct ieee80211_rx_status *rx_status) 955{ 956 size_t baselen; 957 struct ieee802_11_elems elems; 958 959 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 960 offsetof(typeof(mgmt->u.beacon), variable)); 961 962 /* 963 * either beacon or probe_resp but the variable field is at the 964 * same offset 965 */ 966 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 967 if (baselen > len) 968 return; 969 970 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 971 false, &elems); 972 973 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 974} 975 976void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 977 struct sk_buff *skb) 978{ 979 struct ieee80211_rx_status *rx_status; 980 struct ieee80211_mgmt *mgmt; 981 u16 fc; 982 983 rx_status = IEEE80211_SKB_RXCB(skb); 984 mgmt = (struct ieee80211_mgmt *) skb->data; 985 fc = le16_to_cpu(mgmt->frame_control); 986 987 sdata_lock(sdata); 988 989 if (!sdata->u.ibss.ssid_len) 990 goto mgmt_out; /* not ready to merge yet */ 991 992 switch (fc & IEEE80211_FCTL_STYPE) { 993 case IEEE80211_STYPE_PROBE_REQ: 994 ieee80211_rx_mgmt_probe_req(sdata, skb); 995 break; 996 case IEEE80211_STYPE_PROBE_RESP: 997 case IEEE80211_STYPE_BEACON: 998 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 999 rx_status); 1000 break; 1001 case IEEE80211_STYPE_AUTH: 1002 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1003 break; 1004 case IEEE80211_STYPE_DEAUTH: 1005 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1006 break; 1007 } 1008 1009 mgmt_out: 1010 sdata_unlock(sdata); 1011} 1012 1013void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1014{ 1015 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1016 struct sta_info *sta; 1017 1018 sdata_lock(sdata); 1019 1020 /* 1021 * Work could be scheduled after scan or similar 1022 * when we aren't even joined (or trying) with a 1023 * network. 1024 */ 1025 if (!ifibss->ssid_len) 1026 goto out; 1027 1028 spin_lock_bh(&ifibss->incomplete_lock); 1029 while (!list_empty(&ifibss->incomplete_stations)) { 1030 sta = list_first_entry(&ifibss->incomplete_stations, 1031 struct sta_info, list); 1032 list_del(&sta->list); 1033 spin_unlock_bh(&ifibss->incomplete_lock); 1034 1035 ieee80211_ibss_finish_sta(sta); 1036 rcu_read_unlock(); 1037 spin_lock_bh(&ifibss->incomplete_lock); 1038 } 1039 spin_unlock_bh(&ifibss->incomplete_lock); 1040 1041 switch (ifibss->state) { 1042 case IEEE80211_IBSS_MLME_SEARCH: 1043 ieee80211_sta_find_ibss(sdata); 1044 break; 1045 case IEEE80211_IBSS_MLME_JOINED: 1046 ieee80211_sta_merge_ibss(sdata); 1047 break; 1048 default: 1049 WARN_ON(1); 1050 break; 1051 } 1052 1053 out: 1054 sdata_unlock(sdata); 1055} 1056 1057static void ieee80211_ibss_timer(unsigned long data) 1058{ 1059 struct ieee80211_sub_if_data *sdata = 1060 (struct ieee80211_sub_if_data *) data; 1061 1062 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1063} 1064 1065void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1066{ 1067 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1068 1069 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1070 (unsigned long) sdata); 1071 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1072 spin_lock_init(&ifibss->incomplete_lock); 1073} 1074 1075/* scan finished notification */ 1076void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1077{ 1078 struct ieee80211_sub_if_data *sdata; 1079 1080 mutex_lock(&local->iflist_mtx); 1081 list_for_each_entry(sdata, &local->interfaces, list) { 1082 if (!ieee80211_sdata_running(sdata)) 1083 continue; 1084 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1085 continue; 1086 sdata->u.ibss.last_scan_completed = jiffies; 1087 ieee80211_queue_work(&local->hw, &sdata->work); 1088 } 1089 mutex_unlock(&local->iflist_mtx); 1090} 1091 1092int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1093 struct cfg80211_ibss_params *params) 1094{ 1095 u32 changed = 0; 1096 u32 rate_flags; 1097 struct ieee80211_supported_band *sband; 1098 int i; 1099 1100 if (params->bssid) { 1101 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1102 sdata->u.ibss.fixed_bssid = true; 1103 } else 1104 sdata->u.ibss.fixed_bssid = false; 1105 1106 sdata->u.ibss.privacy = params->privacy; 1107 sdata->u.ibss.control_port = params->control_port; 1108 sdata->u.ibss.basic_rates = params->basic_rates; 1109 1110 /* fix basic_rates if channel does not support these rates */ 1111 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1112 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; 1113 for (i = 0; i < sband->n_bitrates; i++) { 1114 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1115 sdata->u.ibss.basic_rates &= ~BIT(i); 1116 } 1117 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1118 sizeof(params->mcast_rate)); 1119 1120 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1121 1122 sdata->u.ibss.chandef = params->chandef; 1123 sdata->u.ibss.fixed_channel = params->channel_fixed; 1124 1125 if (params->ie) { 1126 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1127 GFP_KERNEL); 1128 if (sdata->u.ibss.ie) 1129 sdata->u.ibss.ie_len = params->ie_len; 1130 } 1131 1132 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1133 sdata->u.ibss.ibss_join_req = jiffies; 1134 1135 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1136 sdata->u.ibss.ssid_len = params->ssid_len; 1137 1138 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1139 sizeof(sdata->u.ibss.ht_capa)); 1140 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1141 sizeof(sdata->u.ibss.ht_capa_mask)); 1142 1143 /* 1144 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1145 * reserved, but an HT STA shall protect HT transmissions as though 1146 * the HT Protection field were set to non-HT mixed mode. 1147 * 1148 * In an IBSS, the RIFS Mode field of the HT Operation element is 1149 * also reserved, but an HT STA shall operate as though this field 1150 * were set to 1. 1151 */ 1152 1153 sdata->vif.bss_conf.ht_operation_mode |= 1154 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1155 | IEEE80211_HT_PARAM_RIFS_MODE; 1156 1157 changed |= BSS_CHANGED_HT; 1158 ieee80211_bss_info_change_notify(sdata, changed); 1159 1160 sdata->smps_mode = IEEE80211_SMPS_OFF; 1161 sdata->needed_rx_chains = sdata->local->rx_chains; 1162 1163 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1164 1165 return 0; 1166} 1167 1168int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1169{ 1170 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1171 struct ieee80211_local *local = sdata->local; 1172 struct cfg80211_bss *cbss; 1173 u16 capability; 1174 int active_ibss; 1175 struct sta_info *sta; 1176 struct beacon_data *presp; 1177 1178 active_ibss = ieee80211_sta_active_ibss(sdata); 1179 1180 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { 1181 capability = WLAN_CAPABILITY_IBSS; 1182 1183 if (ifibss->privacy) 1184 capability |= WLAN_CAPABILITY_PRIVACY; 1185 1186 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 1187 ifibss->bssid, ifibss->ssid, 1188 ifibss->ssid_len, WLAN_CAPABILITY_IBSS | 1189 WLAN_CAPABILITY_PRIVACY, 1190 capability); 1191 1192 if (cbss) { 1193 cfg80211_unlink_bss(local->hw.wiphy, cbss); 1194 cfg80211_put_bss(local->hw.wiphy, cbss); 1195 } 1196 } 1197 1198 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 1199 memset(ifibss->bssid, 0, ETH_ALEN); 1200 ifibss->ssid_len = 0; 1201 1202 sta_info_flush(sdata); 1203 1204 spin_lock_bh(&ifibss->incomplete_lock); 1205 while (!list_empty(&ifibss->incomplete_stations)) { 1206 sta = list_first_entry(&ifibss->incomplete_stations, 1207 struct sta_info, list); 1208 list_del(&sta->list); 1209 spin_unlock_bh(&ifibss->incomplete_lock); 1210 1211 sta_info_free(local, sta); 1212 spin_lock_bh(&ifibss->incomplete_lock); 1213 } 1214 spin_unlock_bh(&ifibss->incomplete_lock); 1215 1216 netif_carrier_off(sdata->dev); 1217 1218 /* remove beacon */ 1219 kfree(sdata->u.ibss.ie); 1220 presp = rcu_dereference_protected(ifibss->presp, 1221 lockdep_is_held(&sdata->wdev.mtx)); 1222 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 1223 1224 /* on the next join, re-program HT parameters */ 1225 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1226 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1227 1228 sdata->vif.bss_conf.ibss_joined = false; 1229 sdata->vif.bss_conf.ibss_creator = false; 1230 sdata->vif.bss_conf.enable_beacon = false; 1231 sdata->vif.bss_conf.ssid_len = 0; 1232 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1233 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 1234 BSS_CHANGED_IBSS); 1235 synchronize_rcu(); 1236 kfree(presp); 1237 1238 skb_queue_purge(&sdata->skb_queue); 1239 1240 del_timer_sync(&sdata->u.ibss.timer); 1241 1242 return 0; 1243} 1244