ibss.c revision 2ec9c1f67ab1f58b5bf5ac19e4b61b9f75c83a04
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 break; 173 } 174 175 if (sband->band == IEEE80211_BAND_2GHZ) { 176 *pos++ = WLAN_EID_DS_PARAMS; 177 *pos++ = 1; 178 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 179 } 180 181 *pos++ = WLAN_EID_IBSS_PARAMS; 182 *pos++ = 2; 183 /* FIX: set ATIM window based on scan results */ 184 *pos++ = 0; 185 *pos++ = 0; 186 187 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 188 if (rates_n > 8) { 189 *pos++ = WLAN_EID_EXT_SUPP_RATES; 190 *pos++ = rates_n - 8; 191 for (; ri < sband->n_bitrates; ri++) { 192 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 193 5 * (1 << shift)); 194 u8 basic = 0; 195 if (!(rates & BIT(ri))) 196 continue; 197 198 if (basic_rates & BIT(ri)) 199 basic = 0x80; 200 *pos++ = basic | (u8) rate; 201 } 202 } 203 204 if (ifibss->ie_len) { 205 memcpy(pos, ifibss->ie, ifibss->ie_len); 206 pos += ifibss->ie_len; 207 } 208 209 /* add HT capability and information IEs */ 210 if (chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 211 chandef.width != NL80211_CHAN_WIDTH_5 && 212 chandef.width != NL80211_CHAN_WIDTH_10 && 213 sband->ht_cap.ht_supported) { 214 struct ieee80211_sta_ht_cap ht_cap; 215 216 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 217 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 218 219 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 220 /* 221 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 222 * field and RIFS Mode are reserved in IBSS mode, therefore 223 * keep them at 0 224 */ 225 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 226 &chandef, 0); 227 } 228 229 if (local->hw.queues >= IEEE80211_NUM_ACS) { 230 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 231 *pos++ = 7; /* len */ 232 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 233 *pos++ = 0x50; 234 *pos++ = 0xf2; 235 *pos++ = 2; /* WME */ 236 *pos++ = 0; /* WME info */ 237 *pos++ = 1; /* WME ver */ 238 *pos++ = 0; /* U-APSD no in use */ 239 } 240 241 presp->head_len = pos - presp->head; 242 if (WARN_ON(presp->head_len > frame_len)) 243 return; 244 245 rcu_assign_pointer(ifibss->presp, presp); 246 247 sdata->vif.bss_conf.enable_beacon = true; 248 sdata->vif.bss_conf.beacon_int = beacon_int; 249 sdata->vif.bss_conf.basic_rates = basic_rates; 250 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 251 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 252 bss_change = BSS_CHANGED_BEACON_INT; 253 bss_change |= ieee80211_reset_erp_info(sdata); 254 bss_change |= BSS_CHANGED_BSSID; 255 bss_change |= BSS_CHANGED_BEACON; 256 bss_change |= BSS_CHANGED_BEACON_ENABLED; 257 bss_change |= BSS_CHANGED_BASIC_RATES; 258 bss_change |= BSS_CHANGED_HT; 259 bss_change |= BSS_CHANGED_IBSS; 260 bss_change |= BSS_CHANGED_SSID; 261 262 /* 263 * In 5 GHz/802.11a, we can always use short slot time. 264 * (IEEE 802.11-2012 18.3.8.7) 265 * 266 * In 2.4GHz, we must always use long slots in IBSS for compatibility 267 * reasons. 268 * (IEEE 802.11-2012 19.4.5) 269 * 270 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 271 */ 272 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; 273 bss_change |= BSS_CHANGED_ERP_SLOT; 274 275 /* cf. IEEE 802.11 9.2.12 */ 276 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 277 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 278 else 279 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 280 281 sdata->vif.bss_conf.ibss_joined = true; 282 sdata->vif.bss_conf.ibss_creator = creator; 283 ieee80211_bss_info_change_notify(sdata, bss_change); 284 285 ieee80211_set_wmm_default(sdata, true); 286 287 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 288 mod_timer(&ifibss->timer, 289 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 290 291 scan_width = cfg80211_chandef_to_scan_width(&chandef); 292 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, 293 scan_width, mgmt, 294 presp->head_len, 0, GFP_KERNEL); 295 cfg80211_put_bss(local->hw.wiphy, bss); 296 netif_carrier_on(sdata->dev); 297 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); 298} 299 300static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 301 struct ieee80211_bss *bss) 302{ 303 struct cfg80211_bss *cbss = 304 container_of((void *)bss, struct cfg80211_bss, priv); 305 struct ieee80211_supported_band *sband; 306 u32 basic_rates; 307 int i, j; 308 u16 beacon_int = cbss->beacon_interval; 309 const struct cfg80211_bss_ies *ies; 310 u64 tsf; 311 u32 rate_flags; 312 int shift; 313 314 sdata_assert_lock(sdata); 315 316 if (beacon_int < 10) 317 beacon_int = 10; 318 319 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 320 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 321 shift = ieee80211_vif_get_shift(&sdata->vif); 322 323 basic_rates = 0; 324 325 for (i = 0; i < bss->supp_rates_len; i++) { 326 int rate = bss->supp_rates[i] & 0x7f; 327 bool is_basic = !!(bss->supp_rates[i] & 0x80); 328 329 for (j = 0; j < sband->n_bitrates; j++) { 330 int brate; 331 if ((rate_flags & sband->bitrates[j].flags) 332 != rate_flags) 333 continue; 334 335 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 336 5 * (1 << shift)); 337 if (brate == rate) { 338 if (is_basic) 339 basic_rates |= BIT(j); 340 break; 341 } 342 } 343 } 344 345 rcu_read_lock(); 346 ies = rcu_dereference(cbss->ies); 347 tsf = ies->tsf; 348 rcu_read_unlock(); 349 350 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 351 beacon_int, 352 cbss->channel, 353 basic_rates, 354 cbss->capability, 355 tsf, false); 356} 357 358static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 359 __acquires(RCU) 360{ 361 struct ieee80211_sub_if_data *sdata = sta->sdata; 362 u8 addr[ETH_ALEN]; 363 364 memcpy(addr, sta->sta.addr, ETH_ALEN); 365 366 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 367 368 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 369 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 370 /* authorize the station only if the network is not RSN protected. If 371 * not wait for the userspace to authorize it */ 372 if (!sta->sdata->u.ibss.control_port) 373 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 374 375 rate_control_rate_init(sta); 376 377 /* If it fails, maybe we raced another insertion? */ 378 if (sta_info_insert_rcu(sta)) 379 return sta_info_get(sdata, addr); 380 return sta; 381} 382 383static struct sta_info * 384ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 385 const u8 *addr, u32 supp_rates) 386 __acquires(RCU) 387{ 388 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 389 struct ieee80211_local *local = sdata->local; 390 struct sta_info *sta; 391 struct ieee80211_chanctx_conf *chanctx_conf; 392 struct ieee80211_supported_band *sband; 393 enum nl80211_bss_scan_width scan_width; 394 int band; 395 396 /* 397 * XXX: Consider removing the least recently used entry and 398 * allow new one to be added. 399 */ 400 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 401 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 402 sdata->name, addr); 403 rcu_read_lock(); 404 return NULL; 405 } 406 407 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 408 rcu_read_lock(); 409 return NULL; 410 } 411 412 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 413 rcu_read_lock(); 414 return NULL; 415 } 416 417 rcu_read_lock(); 418 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 419 if (WARN_ON_ONCE(!chanctx_conf)) 420 return NULL; 421 band = chanctx_conf->def.chan->band; 422 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 423 rcu_read_unlock(); 424 425 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 426 if (!sta) { 427 rcu_read_lock(); 428 return NULL; 429 } 430 431 sta->last_rx = jiffies; 432 433 /* make sure mandatory rates are always added */ 434 sband = local->hw.wiphy->bands[band]; 435 sta->sta.supp_rates[band] = supp_rates | 436 ieee80211_mandatory_rates(sband, scan_width); 437 438 return ieee80211_ibss_finish_sta(sta); 439} 440 441static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 442 struct ieee80211_mgmt *mgmt, 443 size_t len) 444{ 445 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 446 447 if (len < IEEE80211_DEAUTH_FRAME_LEN) 448 return; 449 450 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 451 mgmt->sa, mgmt->da, mgmt->bssid, reason); 452 sta_info_destroy_addr(sdata, mgmt->sa); 453} 454 455static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 456 struct ieee80211_mgmt *mgmt, 457 size_t len) 458{ 459 u16 auth_alg, auth_transaction; 460 461 sdata_assert_lock(sdata); 462 463 if (len < 24 + 6) 464 return; 465 466 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 467 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 468 469 ibss_dbg(sdata, 470 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 471 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 472 473 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 474 return; 475 476 /* 477 * IEEE 802.11 standard does not require authentication in IBSS 478 * networks and most implementations do not seem to use it. 479 * However, try to reply to authentication attempts if someone 480 * has actually implemented this. 481 */ 482 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 483 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 484} 485 486static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 487 struct ieee80211_mgmt *mgmt, size_t len, 488 struct ieee80211_rx_status *rx_status, 489 struct ieee802_11_elems *elems) 490{ 491 struct ieee80211_local *local = sdata->local; 492 int freq; 493 struct cfg80211_bss *cbss; 494 struct ieee80211_bss *bss; 495 struct sta_info *sta; 496 struct ieee80211_channel *channel; 497 u64 beacon_timestamp, rx_timestamp; 498 u32 supp_rates = 0; 499 enum ieee80211_band band = rx_status->band; 500 enum nl80211_bss_scan_width scan_width; 501 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 502 bool rates_updated = false; 503 504 if (elems->ds_params) 505 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 506 band); 507 else 508 freq = rx_status->freq; 509 510 channel = ieee80211_get_channel(local->hw.wiphy, freq); 511 512 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 513 return; 514 515 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 516 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { 517 518 rcu_read_lock(); 519 sta = sta_info_get(sdata, mgmt->sa); 520 521 if (elems->supp_rates) { 522 supp_rates = ieee80211_sta_get_rates(sdata, elems, 523 band, NULL); 524 if (sta) { 525 u32 prev_rates; 526 527 prev_rates = sta->sta.supp_rates[band]; 528 /* make sure mandatory rates are always added */ 529 scan_width = NL80211_BSS_CHAN_WIDTH_20; 530 if (rx_status->flag & RX_FLAG_5MHZ) 531 scan_width = NL80211_BSS_CHAN_WIDTH_5; 532 if (rx_status->flag & RX_FLAG_10MHZ) 533 scan_width = NL80211_BSS_CHAN_WIDTH_10; 534 535 sta->sta.supp_rates[band] = supp_rates | 536 ieee80211_mandatory_rates(sband, 537 scan_width); 538 if (sta->sta.supp_rates[band] != prev_rates) { 539 ibss_dbg(sdata, 540 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 541 sta->sta.addr, prev_rates, 542 sta->sta.supp_rates[band]); 543 rates_updated = true; 544 } 545 } else { 546 rcu_read_unlock(); 547 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 548 mgmt->sa, supp_rates); 549 } 550 } 551 552 if (sta && elems->wmm_info) 553 set_sta_flag(sta, WLAN_STA_WME); 554 555 if (sta && elems->ht_operation && elems->ht_cap_elem && 556 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 557 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 558 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 559 /* we both use HT */ 560 struct ieee80211_ht_cap htcap_ie; 561 struct cfg80211_chan_def chandef; 562 563 ieee80211_ht_oper_to_chandef(channel, 564 elems->ht_operation, 565 &chandef); 566 567 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 568 569 /* 570 * fall back to HT20 if we don't use or use 571 * the other extension channel 572 */ 573 if (chandef.center_freq1 != 574 sdata->u.ibss.chandef.center_freq1) 575 htcap_ie.cap_info &= 576 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); 577 578 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( 579 sdata, sband, &htcap_ie, sta); 580 } 581 582 if (sta && rates_updated) { 583 drv_sta_rc_update(local, sdata, &sta->sta, 584 IEEE80211_RC_SUPP_RATES_CHANGED); 585 rate_control_rate_init(sta); 586 } 587 588 rcu_read_unlock(); 589 } 590 591 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 592 channel); 593 if (!bss) 594 return; 595 596 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 597 598 /* same for beacon and probe response */ 599 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 600 601 /* check if we need to merge IBSS */ 602 603 /* we use a fixed BSSID */ 604 if (sdata->u.ibss.fixed_bssid) 605 goto put_bss; 606 607 /* not an IBSS */ 608 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 609 goto put_bss; 610 611 /* different channel */ 612 if (sdata->u.ibss.fixed_channel && 613 sdata->u.ibss.chandef.chan != cbss->channel) 614 goto put_bss; 615 616 /* different SSID */ 617 if (elems->ssid_len != sdata->u.ibss.ssid_len || 618 memcmp(elems->ssid, sdata->u.ibss.ssid, 619 sdata->u.ibss.ssid_len)) 620 goto put_bss; 621 622 /* same BSSID */ 623 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 624 goto put_bss; 625 626 if (ieee80211_have_rx_timestamp(rx_status)) { 627 /* time when timestamp field was received */ 628 rx_timestamp = 629 ieee80211_calculate_rx_timestamp(local, rx_status, 630 len + FCS_LEN, 24); 631 } else { 632 /* 633 * second best option: get current TSF 634 * (will return -1 if not supported) 635 */ 636 rx_timestamp = drv_get_tsf(local, sdata); 637 } 638 639 ibss_dbg(sdata, 640 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 641 mgmt->sa, mgmt->bssid, 642 (unsigned long long)rx_timestamp, 643 (unsigned long long)beacon_timestamp, 644 (unsigned long long)(rx_timestamp - beacon_timestamp), 645 jiffies); 646 647 if (beacon_timestamp > rx_timestamp) { 648 ibss_dbg(sdata, 649 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 650 mgmt->bssid); 651 ieee80211_sta_join_ibss(sdata, bss); 652 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 653 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 654 supp_rates); 655 rcu_read_unlock(); 656 } 657 658 put_bss: 659 ieee80211_rx_bss_put(local, bss); 660} 661 662void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 663 const u8 *bssid, const u8 *addr, 664 u32 supp_rates) 665{ 666 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 667 struct ieee80211_local *local = sdata->local; 668 struct sta_info *sta; 669 struct ieee80211_chanctx_conf *chanctx_conf; 670 struct ieee80211_supported_band *sband; 671 enum nl80211_bss_scan_width scan_width; 672 int band; 673 674 /* 675 * XXX: Consider removing the least recently used entry and 676 * allow new one to be added. 677 */ 678 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 679 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 680 sdata->name, addr); 681 return; 682 } 683 684 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 685 return; 686 687 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 688 return; 689 690 rcu_read_lock(); 691 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 692 if (WARN_ON_ONCE(!chanctx_conf)) { 693 rcu_read_unlock(); 694 return; 695 } 696 band = chanctx_conf->def.chan->band; 697 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 698 rcu_read_unlock(); 699 700 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 701 if (!sta) 702 return; 703 704 sta->last_rx = jiffies; 705 706 /* make sure mandatory rates are always added */ 707 sband = local->hw.wiphy->bands[band]; 708 sta->sta.supp_rates[band] = supp_rates | 709 ieee80211_mandatory_rates(sband, scan_width); 710 711 spin_lock(&ifibss->incomplete_lock); 712 list_add(&sta->list, &ifibss->incomplete_stations); 713 spin_unlock(&ifibss->incomplete_lock); 714 ieee80211_queue_work(&local->hw, &sdata->work); 715} 716 717static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 718{ 719 struct ieee80211_local *local = sdata->local; 720 int active = 0; 721 struct sta_info *sta; 722 723 sdata_assert_lock(sdata); 724 725 rcu_read_lock(); 726 727 list_for_each_entry_rcu(sta, &local->sta_list, list) { 728 if (sta->sdata == sdata && 729 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 730 jiffies)) { 731 active++; 732 break; 733 } 734 } 735 736 rcu_read_unlock(); 737 738 return active; 739} 740 741/* 742 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 743 */ 744 745static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 746{ 747 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 748 enum nl80211_bss_scan_width scan_width; 749 750 sdata_assert_lock(sdata); 751 752 mod_timer(&ifibss->timer, 753 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 754 755 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); 756 757 if (time_before(jiffies, ifibss->last_scan_completed + 758 IEEE80211_IBSS_MERGE_INTERVAL)) 759 return; 760 761 if (ieee80211_sta_active_ibss(sdata)) 762 return; 763 764 if (ifibss->fixed_channel) 765 return; 766 767 sdata_info(sdata, 768 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 769 770 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 771 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 772 NULL, scan_width); 773} 774 775static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 776{ 777 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 778 u8 bssid[ETH_ALEN]; 779 u16 capability; 780 int i; 781 782 sdata_assert_lock(sdata); 783 784 if (ifibss->fixed_bssid) { 785 memcpy(bssid, ifibss->bssid, ETH_ALEN); 786 } else { 787 /* Generate random, not broadcast, locally administered BSSID. Mix in 788 * own MAC address to make sure that devices that do not have proper 789 * random number generator get different BSSID. */ 790 get_random_bytes(bssid, ETH_ALEN); 791 for (i = 0; i < ETH_ALEN; i++) 792 bssid[i] ^= sdata->vif.addr[i]; 793 bssid[0] &= ~0x01; 794 bssid[0] |= 0x02; 795 } 796 797 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 798 799 capability = WLAN_CAPABILITY_IBSS; 800 801 if (ifibss->privacy) 802 capability |= WLAN_CAPABILITY_PRIVACY; 803 else 804 sdata->drop_unencrypted = 0; 805 806 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 807 ifibss->chandef.chan, ifibss->basic_rates, 808 capability, 0, true); 809} 810 811/* 812 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 813 */ 814 815static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 816{ 817 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 818 struct ieee80211_local *local = sdata->local; 819 struct cfg80211_bss *cbss; 820 struct ieee80211_channel *chan = NULL; 821 const u8 *bssid = NULL; 822 enum nl80211_bss_scan_width scan_width; 823 int active_ibss; 824 u16 capability; 825 826 sdata_assert_lock(sdata); 827 828 active_ibss = ieee80211_sta_active_ibss(sdata); 829 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 830 831 if (active_ibss) 832 return; 833 834 capability = WLAN_CAPABILITY_IBSS; 835 if (ifibss->privacy) 836 capability |= WLAN_CAPABILITY_PRIVACY; 837 if (ifibss->fixed_bssid) 838 bssid = ifibss->bssid; 839 if (ifibss->fixed_channel) 840 chan = ifibss->chandef.chan; 841 if (!is_zero_ether_addr(ifibss->bssid)) 842 bssid = ifibss->bssid; 843 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 844 ifibss->ssid, ifibss->ssid_len, 845 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, 846 capability); 847 848 if (cbss) { 849 struct ieee80211_bss *bss; 850 851 bss = (void *)cbss->priv; 852 ibss_dbg(sdata, 853 "sta_find_ibss: selected %pM current %pM\n", 854 cbss->bssid, ifibss->bssid); 855 sdata_info(sdata, 856 "Selected IBSS BSSID %pM based on configured SSID\n", 857 cbss->bssid); 858 859 ieee80211_sta_join_ibss(sdata, bss); 860 ieee80211_rx_bss_put(local, bss); 861 return; 862 } 863 864 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 865 866 /* Selected IBSS not found in current scan results - try to scan */ 867 if (time_after(jiffies, ifibss->last_scan_completed + 868 IEEE80211_SCAN_INTERVAL)) { 869 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 870 871 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 872 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 873 ifibss->ssid_len, chan, 874 scan_width); 875 } else { 876 int interval = IEEE80211_SCAN_INTERVAL; 877 878 if (time_after(jiffies, ifibss->ibss_join_req + 879 IEEE80211_IBSS_JOIN_TIMEOUT)) 880 ieee80211_sta_create_ibss(sdata); 881 882 mod_timer(&ifibss->timer, 883 round_jiffies(jiffies + interval)); 884 } 885} 886 887static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 888 struct sk_buff *req) 889{ 890 struct ieee80211_mgmt *mgmt = (void *)req->data; 891 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 892 struct ieee80211_local *local = sdata->local; 893 int tx_last_beacon, len = req->len; 894 struct sk_buff *skb; 895 struct beacon_data *presp; 896 u8 *pos, *end; 897 898 sdata_assert_lock(sdata); 899 900 presp = rcu_dereference_protected(ifibss->presp, 901 lockdep_is_held(&sdata->wdev.mtx)); 902 903 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 904 len < 24 + 2 || !presp) 905 return; 906 907 tx_last_beacon = drv_tx_last_beacon(local); 908 909 ibss_dbg(sdata, 910 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 911 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 912 913 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 914 return; 915 916 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 917 !is_broadcast_ether_addr(mgmt->bssid)) 918 return; 919 920 end = ((u8 *) mgmt) + len; 921 pos = mgmt->u.probe_req.variable; 922 if (pos[0] != WLAN_EID_SSID || 923 pos + 2 + pos[1] > end) { 924 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 925 mgmt->sa); 926 return; 927 } 928 if (pos[1] != 0 && 929 (pos[1] != ifibss->ssid_len || 930 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 931 /* Ignore ProbeReq for foreign SSID */ 932 return; 933 } 934 935 /* Reply with ProbeResp */ 936 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 937 if (!skb) 938 return; 939 940 skb_reserve(skb, local->tx_headroom); 941 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 942 943 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 944 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 945 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 946 ieee80211_tx_skb(sdata, skb); 947} 948 949static 950void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 951 struct ieee80211_mgmt *mgmt, size_t len, 952 struct ieee80211_rx_status *rx_status) 953{ 954 size_t baselen; 955 struct ieee802_11_elems elems; 956 957 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 958 offsetof(typeof(mgmt->u.beacon), variable)); 959 960 /* 961 * either beacon or probe_resp but the variable field is at the 962 * same offset 963 */ 964 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 965 if (baselen > len) 966 return; 967 968 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 969 false, &elems); 970 971 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 972} 973 974void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 975 struct sk_buff *skb) 976{ 977 struct ieee80211_rx_status *rx_status; 978 struct ieee80211_mgmt *mgmt; 979 u16 fc; 980 981 rx_status = IEEE80211_SKB_RXCB(skb); 982 mgmt = (struct ieee80211_mgmt *) skb->data; 983 fc = le16_to_cpu(mgmt->frame_control); 984 985 sdata_lock(sdata); 986 987 if (!sdata->u.ibss.ssid_len) 988 goto mgmt_out; /* not ready to merge yet */ 989 990 switch (fc & IEEE80211_FCTL_STYPE) { 991 case IEEE80211_STYPE_PROBE_REQ: 992 ieee80211_rx_mgmt_probe_req(sdata, skb); 993 break; 994 case IEEE80211_STYPE_PROBE_RESP: 995 case IEEE80211_STYPE_BEACON: 996 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 997 rx_status); 998 break; 999 case IEEE80211_STYPE_AUTH: 1000 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1001 break; 1002 case IEEE80211_STYPE_DEAUTH: 1003 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1004 break; 1005 } 1006 1007 mgmt_out: 1008 sdata_unlock(sdata); 1009} 1010 1011void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1012{ 1013 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1014 struct sta_info *sta; 1015 1016 sdata_lock(sdata); 1017 1018 /* 1019 * Work could be scheduled after scan or similar 1020 * when we aren't even joined (or trying) with a 1021 * network. 1022 */ 1023 if (!ifibss->ssid_len) 1024 goto out; 1025 1026 spin_lock_bh(&ifibss->incomplete_lock); 1027 while (!list_empty(&ifibss->incomplete_stations)) { 1028 sta = list_first_entry(&ifibss->incomplete_stations, 1029 struct sta_info, list); 1030 list_del(&sta->list); 1031 spin_unlock_bh(&ifibss->incomplete_lock); 1032 1033 ieee80211_ibss_finish_sta(sta); 1034 rcu_read_unlock(); 1035 spin_lock_bh(&ifibss->incomplete_lock); 1036 } 1037 spin_unlock_bh(&ifibss->incomplete_lock); 1038 1039 switch (ifibss->state) { 1040 case IEEE80211_IBSS_MLME_SEARCH: 1041 ieee80211_sta_find_ibss(sdata); 1042 break; 1043 case IEEE80211_IBSS_MLME_JOINED: 1044 ieee80211_sta_merge_ibss(sdata); 1045 break; 1046 default: 1047 WARN_ON(1); 1048 break; 1049 } 1050 1051 out: 1052 sdata_unlock(sdata); 1053} 1054 1055static void ieee80211_ibss_timer(unsigned long data) 1056{ 1057 struct ieee80211_sub_if_data *sdata = 1058 (struct ieee80211_sub_if_data *) data; 1059 1060 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1061} 1062 1063void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1064{ 1065 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1066 1067 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1068 (unsigned long) sdata); 1069 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1070 spin_lock_init(&ifibss->incomplete_lock); 1071} 1072 1073/* scan finished notification */ 1074void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1075{ 1076 struct ieee80211_sub_if_data *sdata; 1077 1078 mutex_lock(&local->iflist_mtx); 1079 list_for_each_entry(sdata, &local->interfaces, list) { 1080 if (!ieee80211_sdata_running(sdata)) 1081 continue; 1082 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1083 continue; 1084 sdata->u.ibss.last_scan_completed = jiffies; 1085 ieee80211_queue_work(&local->hw, &sdata->work); 1086 } 1087 mutex_unlock(&local->iflist_mtx); 1088} 1089 1090int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1091 struct cfg80211_ibss_params *params) 1092{ 1093 u32 changed = 0; 1094 u32 rate_flags; 1095 struct ieee80211_supported_band *sband; 1096 int i; 1097 1098 if (params->bssid) { 1099 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1100 sdata->u.ibss.fixed_bssid = true; 1101 } else 1102 sdata->u.ibss.fixed_bssid = false; 1103 1104 sdata->u.ibss.privacy = params->privacy; 1105 sdata->u.ibss.control_port = params->control_port; 1106 sdata->u.ibss.basic_rates = params->basic_rates; 1107 1108 /* fix basic_rates if channel does not support these rates */ 1109 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1110 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; 1111 for (i = 0; i < sband->n_bitrates; i++) { 1112 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1113 sdata->u.ibss.basic_rates &= ~BIT(i); 1114 } 1115 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1116 sizeof(params->mcast_rate)); 1117 1118 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1119 1120 sdata->u.ibss.chandef = params->chandef; 1121 sdata->u.ibss.fixed_channel = params->channel_fixed; 1122 1123 if (params->ie) { 1124 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1125 GFP_KERNEL); 1126 if (sdata->u.ibss.ie) 1127 sdata->u.ibss.ie_len = params->ie_len; 1128 } 1129 1130 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1131 sdata->u.ibss.ibss_join_req = jiffies; 1132 1133 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1134 sdata->u.ibss.ssid_len = params->ssid_len; 1135 1136 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1137 sizeof(sdata->u.ibss.ht_capa)); 1138 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1139 sizeof(sdata->u.ibss.ht_capa_mask)); 1140 1141 /* 1142 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1143 * reserved, but an HT STA shall protect HT transmissions as though 1144 * the HT Protection field were set to non-HT mixed mode. 1145 * 1146 * In an IBSS, the RIFS Mode field of the HT Operation element is 1147 * also reserved, but an HT STA shall operate as though this field 1148 * were set to 1. 1149 */ 1150 1151 sdata->vif.bss_conf.ht_operation_mode |= 1152 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1153 | IEEE80211_HT_PARAM_RIFS_MODE; 1154 1155 changed |= BSS_CHANGED_HT; 1156 ieee80211_bss_info_change_notify(sdata, changed); 1157 1158 sdata->smps_mode = IEEE80211_SMPS_OFF; 1159 sdata->needed_rx_chains = sdata->local->rx_chains; 1160 1161 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1162 1163 return 0; 1164} 1165 1166int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1167{ 1168 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1169 struct ieee80211_local *local = sdata->local; 1170 struct cfg80211_bss *cbss; 1171 u16 capability; 1172 int active_ibss; 1173 struct sta_info *sta; 1174 struct beacon_data *presp; 1175 1176 active_ibss = ieee80211_sta_active_ibss(sdata); 1177 1178 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { 1179 capability = WLAN_CAPABILITY_IBSS; 1180 1181 if (ifibss->privacy) 1182 capability |= WLAN_CAPABILITY_PRIVACY; 1183 1184 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 1185 ifibss->bssid, ifibss->ssid, 1186 ifibss->ssid_len, WLAN_CAPABILITY_IBSS | 1187 WLAN_CAPABILITY_PRIVACY, 1188 capability); 1189 1190 if (cbss) { 1191 cfg80211_unlink_bss(local->hw.wiphy, cbss); 1192 cfg80211_put_bss(local->hw.wiphy, cbss); 1193 } 1194 } 1195 1196 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 1197 memset(ifibss->bssid, 0, ETH_ALEN); 1198 ifibss->ssid_len = 0; 1199 1200 sta_info_flush(sdata); 1201 1202 spin_lock_bh(&ifibss->incomplete_lock); 1203 while (!list_empty(&ifibss->incomplete_stations)) { 1204 sta = list_first_entry(&ifibss->incomplete_stations, 1205 struct sta_info, list); 1206 list_del(&sta->list); 1207 spin_unlock_bh(&ifibss->incomplete_lock); 1208 1209 sta_info_free(local, sta); 1210 spin_lock_bh(&ifibss->incomplete_lock); 1211 } 1212 spin_unlock_bh(&ifibss->incomplete_lock); 1213 1214 netif_carrier_off(sdata->dev); 1215 1216 /* remove beacon */ 1217 kfree(sdata->u.ibss.ie); 1218 presp = rcu_dereference_protected(ifibss->presp, 1219 lockdep_is_held(&sdata->wdev.mtx)); 1220 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 1221 1222 /* on the next join, re-program HT parameters */ 1223 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1224 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1225 1226 sdata->vif.bss_conf.ibss_joined = false; 1227 sdata->vif.bss_conf.ibss_creator = false; 1228 sdata->vif.bss_conf.enable_beacon = false; 1229 sdata->vif.bss_conf.ssid_len = 0; 1230 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1231 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 1232 BSS_CHANGED_IBSS); 1233 synchronize_rcu(); 1234 kfree(presp); 1235 1236 skb_queue_purge(&sdata->skb_queue); 1237 1238 del_timer_sync(&sdata->u.ibss.timer); 1239 1240 return 0; 1241} 1242