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 * Copyright 2013-2014 Intel Mobile Communications GmbH 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16#include <linux/delay.h> 17#include <linux/slab.h> 18#include <linux/if_ether.h> 19#include <linux/skbuff.h> 20#include <linux/if_arp.h> 21#include <linux/etherdevice.h> 22#include <linux/rtnetlink.h> 23#include <net/mac80211.h> 24 25#include "ieee80211_i.h" 26#include "driver-ops.h" 27#include "rate.h" 28 29#define IEEE80211_SCAN_INTERVAL (2 * HZ) 30#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 31 32#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 33#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 34#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 35 36#define IEEE80211_IBSS_MAX_STA_ENTRIES 128 37 38static struct beacon_data * 39ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 40 const int beacon_int, const u32 basic_rates, 41 const u16 capability, u64 tsf, 42 struct cfg80211_chan_def *chandef, 43 bool *have_higher_than_11mbit, 44 struct cfg80211_csa_settings *csa_settings) 45{ 46 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 47 struct ieee80211_local *local = sdata->local; 48 int rates_n = 0, i, ri; 49 struct ieee80211_mgmt *mgmt; 50 u8 *pos; 51 struct ieee80211_supported_band *sband; 52 u32 rate_flags, rates = 0, rates_added = 0; 53 struct beacon_data *presp; 54 int frame_len; 55 int shift; 56 57 /* Build IBSS probe response */ 58 frame_len = sizeof(struct ieee80211_hdr_3addr) + 59 12 /* struct ieee80211_mgmt.u.beacon */ + 60 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 61 2 + 8 /* max Supported Rates */ + 62 3 /* max DS params */ + 63 4 /* IBSS params */ + 64 5 /* Channel Switch Announcement */ + 65 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 66 2 + sizeof(struct ieee80211_ht_cap) + 67 2 + sizeof(struct ieee80211_ht_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 shift = ieee80211_chandef_get_shift(chandef); 95 rates_n = 0; 96 if (have_higher_than_11mbit) 97 *have_higher_than_11mbit = false; 98 99 for (i = 0; i < sband->n_bitrates; i++) { 100 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 101 continue; 102 if (sband->bitrates[i].bitrate > 110 && 103 have_higher_than_11mbit) 104 *have_higher_than_11mbit = true; 105 106 rates |= BIT(i); 107 rates_n++; 108 } 109 110 *pos++ = WLAN_EID_SUPP_RATES; 111 *pos++ = min_t(int, 8, rates_n); 112 for (ri = 0; ri < sband->n_bitrates; ri++) { 113 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 114 5 * (1 << shift)); 115 u8 basic = 0; 116 if (!(rates & BIT(ri))) 117 continue; 118 119 if (basic_rates & BIT(ri)) 120 basic = 0x80; 121 *pos++ = basic | (u8) rate; 122 if (++rates_added == 8) { 123 ri++; /* continue at next rate for EXT_SUPP_RATES */ 124 break; 125 } 126 } 127 128 if (sband->band == IEEE80211_BAND_2GHZ) { 129 *pos++ = WLAN_EID_DS_PARAMS; 130 *pos++ = 1; 131 *pos++ = ieee80211_frequency_to_channel( 132 chandef->chan->center_freq); 133 } 134 135 *pos++ = WLAN_EID_IBSS_PARAMS; 136 *pos++ = 2; 137 /* FIX: set ATIM window based on scan results */ 138 *pos++ = 0; 139 *pos++ = 0; 140 141 if (csa_settings) { 142 *pos++ = WLAN_EID_CHANNEL_SWITCH; 143 *pos++ = 3; 144 *pos++ = csa_settings->block_tx ? 1 : 0; 145 *pos++ = ieee80211_frequency_to_channel( 146 csa_settings->chandef.chan->center_freq); 147 presp->csa_counter_offsets[0] = (pos - presp->head); 148 *pos++ = csa_settings->count; 149 presp->csa_current_counter = csa_settings->count; 150 } 151 152 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 153 if (rates_n > 8) { 154 *pos++ = WLAN_EID_EXT_SUPP_RATES; 155 *pos++ = rates_n - 8; 156 for (; ri < sband->n_bitrates; ri++) { 157 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 158 5 * (1 << shift)); 159 u8 basic = 0; 160 if (!(rates & BIT(ri))) 161 continue; 162 163 if (basic_rates & BIT(ri)) 164 basic = 0x80; 165 *pos++ = basic | (u8) rate; 166 } 167 } 168 169 if (ifibss->ie_len) { 170 memcpy(pos, ifibss->ie, ifibss->ie_len); 171 pos += ifibss->ie_len; 172 } 173 174 /* add HT capability and information IEs */ 175 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 176 chandef->width != NL80211_CHAN_WIDTH_5 && 177 chandef->width != NL80211_CHAN_WIDTH_10 && 178 sband->ht_cap.ht_supported) { 179 struct ieee80211_sta_ht_cap ht_cap; 180 181 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 182 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 183 184 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 185 /* 186 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 187 * field and RIFS Mode are reserved in IBSS mode, therefore 188 * keep them at 0 189 */ 190 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 191 chandef, 0); 192 193 /* add VHT capability and information IEs */ 194 if (chandef->width != NL80211_CHAN_WIDTH_20 && 195 chandef->width != NL80211_CHAN_WIDTH_40 && 196 sband->vht_cap.vht_supported) { 197 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 198 sband->vht_cap.cap); 199 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 200 chandef); 201 } 202 } 203 204 if (local->hw.queues >= IEEE80211_NUM_ACS) 205 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 206 207 presp->head_len = pos - presp->head; 208 if (WARN_ON(presp->head_len > frame_len)) 209 goto error; 210 211 return presp; 212error: 213 kfree(presp); 214 return NULL; 215} 216 217static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 218 const u8 *bssid, const int beacon_int, 219 struct cfg80211_chan_def *req_chandef, 220 const u32 basic_rates, 221 const u16 capability, u64 tsf, 222 bool creator) 223{ 224 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 225 struct ieee80211_local *local = sdata->local; 226 struct ieee80211_mgmt *mgmt; 227 struct cfg80211_bss *bss; 228 u32 bss_change; 229 struct cfg80211_chan_def chandef; 230 struct ieee80211_channel *chan; 231 struct beacon_data *presp; 232 enum nl80211_bss_scan_width scan_width; 233 bool have_higher_than_11mbit; 234 bool radar_required; 235 int err; 236 237 sdata_assert_lock(sdata); 238 239 /* Reset own TSF to allow time synchronization work. */ 240 drv_reset_tsf(local, sdata); 241 242 if (!ether_addr_equal(ifibss->bssid, bssid)) 243 sta_info_flush(sdata); 244 245 /* if merging, indicate to driver that we leave the old IBSS */ 246 if (sdata->vif.bss_conf.ibss_joined) { 247 sdata->vif.bss_conf.ibss_joined = false; 248 sdata->vif.bss_conf.ibss_creator = false; 249 sdata->vif.bss_conf.enable_beacon = false; 250 netif_carrier_off(sdata->dev); 251 ieee80211_bss_info_change_notify(sdata, 252 BSS_CHANGED_IBSS | 253 BSS_CHANGED_BEACON_ENABLED); 254 drv_leave_ibss(local, sdata); 255 } 256 257 presp = rcu_dereference_protected(ifibss->presp, 258 lockdep_is_held(&sdata->wdev.mtx)); 259 RCU_INIT_POINTER(ifibss->presp, NULL); 260 if (presp) 261 kfree_rcu(presp, rcu_head); 262 263 /* make a copy of the chandef, it could be modified below. */ 264 chandef = *req_chandef; 265 chan = chandef.chan; 266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 267 NL80211_IFTYPE_ADHOC)) { 268 if (chandef.width == NL80211_CHAN_WIDTH_5 || 269 chandef.width == NL80211_CHAN_WIDTH_10 || 270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 271 chandef.width == NL80211_CHAN_WIDTH_20) { 272 sdata_info(sdata, 273 "Failed to join IBSS, beacons forbidden\n"); 274 return; 275 } 276 chandef.width = NL80211_CHAN_WIDTH_20; 277 chandef.center_freq1 = chan->center_freq; 278 /* check again for downgraded chandef */ 279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 280 NL80211_IFTYPE_ADHOC)) { 281 sdata_info(sdata, 282 "Failed to join IBSS, beacons forbidden\n"); 283 return; 284 } 285 } 286 287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 288 &chandef, NL80211_IFTYPE_ADHOC); 289 if (err < 0) { 290 sdata_info(sdata, 291 "Failed to join IBSS, invalid chandef\n"); 292 return; 293 } 294 if (err > 0 && !ifibss->userspace_handles_dfs) { 295 sdata_info(sdata, 296 "Failed to join IBSS, DFS channel without control program\n"); 297 return; 298 } 299 300 radar_required = err; 301 302 mutex_lock(&local->mtx); 303 if (ieee80211_vif_use_channel(sdata, &chandef, 304 ifibss->fixed_channel ? 305 IEEE80211_CHANCTX_SHARED : 306 IEEE80211_CHANCTX_EXCLUSIVE)) { 307 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 308 mutex_unlock(&local->mtx); 309 return; 310 } 311 sdata->radar_required = radar_required; 312 mutex_unlock(&local->mtx); 313 314 memcpy(ifibss->bssid, bssid, ETH_ALEN); 315 316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 317 capability, tsf, &chandef, 318 &have_higher_than_11mbit, NULL); 319 if (!presp) 320 return; 321 322 rcu_assign_pointer(ifibss->presp, presp); 323 mgmt = (void *)presp->head; 324 325 sdata->vif.bss_conf.enable_beacon = true; 326 sdata->vif.bss_conf.beacon_int = beacon_int; 327 sdata->vif.bss_conf.basic_rates = basic_rates; 328 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 329 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 330 bss_change = BSS_CHANGED_BEACON_INT; 331 bss_change |= ieee80211_reset_erp_info(sdata); 332 bss_change |= BSS_CHANGED_BSSID; 333 bss_change |= BSS_CHANGED_BEACON; 334 bss_change |= BSS_CHANGED_BEACON_ENABLED; 335 bss_change |= BSS_CHANGED_BASIC_RATES; 336 bss_change |= BSS_CHANGED_HT; 337 bss_change |= BSS_CHANGED_IBSS; 338 bss_change |= BSS_CHANGED_SSID; 339 340 /* 341 * In 5 GHz/802.11a, we can always use short slot time. 342 * (IEEE 802.11-2012 18.3.8.7) 343 * 344 * In 2.4GHz, we must always use long slots in IBSS for compatibility 345 * reasons. 346 * (IEEE 802.11-2012 19.4.5) 347 * 348 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 349 */ 350 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; 351 bss_change |= BSS_CHANGED_ERP_SLOT; 352 353 /* cf. IEEE 802.11 9.2.12 */ 354 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 355 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 356 else 357 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 358 359 ieee80211_set_wmm_default(sdata, true); 360 361 sdata->vif.bss_conf.ibss_joined = true; 362 sdata->vif.bss_conf.ibss_creator = creator; 363 364 err = drv_join_ibss(local, sdata); 365 if (err) { 366 sdata->vif.bss_conf.ibss_joined = false; 367 sdata->vif.bss_conf.ibss_creator = false; 368 sdata->vif.bss_conf.enable_beacon = false; 369 sdata->vif.bss_conf.ssid_len = 0; 370 RCU_INIT_POINTER(ifibss->presp, NULL); 371 kfree_rcu(presp, rcu_head); 372 mutex_lock(&local->mtx); 373 ieee80211_vif_release_channel(sdata); 374 mutex_unlock(&local->mtx); 375 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 376 err); 377 return; 378 } 379 380 ieee80211_bss_info_change_notify(sdata, bss_change); 381 382 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 383 mod_timer(&ifibss->timer, 384 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 385 386 scan_width = cfg80211_chandef_to_scan_width(&chandef); 387 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, 388 scan_width, mgmt, 389 presp->head_len, 0, GFP_KERNEL); 390 cfg80211_put_bss(local->hw.wiphy, bss); 391 netif_carrier_on(sdata->dev); 392 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 393} 394 395static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 396 struct ieee80211_bss *bss) 397{ 398 struct cfg80211_bss *cbss = 399 container_of((void *)bss, struct cfg80211_bss, priv); 400 struct ieee80211_supported_band *sband; 401 struct cfg80211_chan_def chandef; 402 u32 basic_rates; 403 int i, j; 404 u16 beacon_int = cbss->beacon_interval; 405 const struct cfg80211_bss_ies *ies; 406 enum nl80211_channel_type chan_type; 407 u64 tsf; 408 u32 rate_flags; 409 int shift; 410 411 sdata_assert_lock(sdata); 412 413 if (beacon_int < 10) 414 beacon_int = 10; 415 416 switch (sdata->u.ibss.chandef.width) { 417 case NL80211_CHAN_WIDTH_20_NOHT: 418 case NL80211_CHAN_WIDTH_20: 419 case NL80211_CHAN_WIDTH_40: 420 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 421 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 422 break; 423 case NL80211_CHAN_WIDTH_5: 424 case NL80211_CHAN_WIDTH_10: 425 cfg80211_chandef_create(&chandef, cbss->channel, 426 NL80211_CHAN_WIDTH_20_NOHT); 427 chandef.width = sdata->u.ibss.chandef.width; 428 break; 429 case NL80211_CHAN_WIDTH_80: 430 case NL80211_CHAN_WIDTH_160: 431 chandef = sdata->u.ibss.chandef; 432 chandef.chan = cbss->channel; 433 break; 434 default: 435 /* fall back to 20 MHz for unsupported modes */ 436 cfg80211_chandef_create(&chandef, cbss->channel, 437 NL80211_CHAN_WIDTH_20_NOHT); 438 break; 439 } 440 441 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 442 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 443 shift = ieee80211_vif_get_shift(&sdata->vif); 444 445 basic_rates = 0; 446 447 for (i = 0; i < bss->supp_rates_len; i++) { 448 int rate = bss->supp_rates[i] & 0x7f; 449 bool is_basic = !!(bss->supp_rates[i] & 0x80); 450 451 for (j = 0; j < sband->n_bitrates; j++) { 452 int brate; 453 if ((rate_flags & sband->bitrates[j].flags) 454 != rate_flags) 455 continue; 456 457 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 458 5 * (1 << shift)); 459 if (brate == rate) { 460 if (is_basic) 461 basic_rates |= BIT(j); 462 break; 463 } 464 } 465 } 466 467 rcu_read_lock(); 468 ies = rcu_dereference(cbss->ies); 469 tsf = ies->tsf; 470 rcu_read_unlock(); 471 472 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 473 beacon_int, 474 &chandef, 475 basic_rates, 476 cbss->capability, 477 tsf, false); 478} 479 480int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 481 struct cfg80211_csa_settings *csa_settings) 482{ 483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 484 struct beacon_data *presp, *old_presp; 485 struct cfg80211_bss *cbss; 486 const struct cfg80211_bss_ies *ies; 487 u16 capability = 0; 488 u64 tsf; 489 int ret = 0; 490 491 sdata_assert_lock(sdata); 492 493 if (ifibss->privacy) 494 capability = WLAN_CAPABILITY_PRIVACY; 495 496 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 497 ifibss->bssid, ifibss->ssid, 498 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 499 IEEE80211_PRIVACY(ifibss->privacy)); 500 501 if (WARN_ON(!cbss)) { 502 ret = -EINVAL; 503 goto out; 504 } 505 506 rcu_read_lock(); 507 ies = rcu_dereference(cbss->ies); 508 tsf = ies->tsf; 509 rcu_read_unlock(); 510 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 511 512 old_presp = rcu_dereference_protected(ifibss->presp, 513 lockdep_is_held(&sdata->wdev.mtx)); 514 515 presp = ieee80211_ibss_build_presp(sdata, 516 sdata->vif.bss_conf.beacon_int, 517 sdata->vif.bss_conf.basic_rates, 518 capability, tsf, &ifibss->chandef, 519 NULL, csa_settings); 520 if (!presp) { 521 ret = -ENOMEM; 522 goto out; 523 } 524 525 rcu_assign_pointer(ifibss->presp, presp); 526 if (old_presp) 527 kfree_rcu(old_presp, rcu_head); 528 529 return BSS_CHANGED_BEACON; 530 out: 531 return ret; 532} 533 534int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 535{ 536 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 537 struct cfg80211_bss *cbss; 538 int err, changed = 0; 539 540 sdata_assert_lock(sdata); 541 542 /* update cfg80211 bss information with the new channel */ 543 if (!is_zero_ether_addr(ifibss->bssid)) { 544 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 545 ifibss->chandef.chan, 546 ifibss->bssid, ifibss->ssid, 547 ifibss->ssid_len, 548 IEEE80211_BSS_TYPE_IBSS, 549 IEEE80211_PRIVACY(ifibss->privacy)); 550 /* XXX: should not really modify cfg80211 data */ 551 if (cbss) { 552 cbss->channel = sdata->csa_chandef.chan; 553 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 554 } 555 } 556 557 ifibss->chandef = sdata->csa_chandef; 558 559 /* generate the beacon */ 560 err = ieee80211_ibss_csa_beacon(sdata, NULL); 561 if (err < 0) 562 return err; 563 564 changed |= err; 565 566 return changed; 567} 568 569void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 570{ 571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 572 573 cancel_work_sync(&ifibss->csa_connection_drop_work); 574} 575 576static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 577 __acquires(RCU) 578{ 579 struct ieee80211_sub_if_data *sdata = sta->sdata; 580 u8 addr[ETH_ALEN]; 581 582 memcpy(addr, sta->sta.addr, ETH_ALEN); 583 584 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 585 586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 587 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 588 /* authorize the station only if the network is not RSN protected. If 589 * not wait for the userspace to authorize it */ 590 if (!sta->sdata->u.ibss.control_port) 591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 592 593 rate_control_rate_init(sta); 594 595 /* If it fails, maybe we raced another insertion? */ 596 if (sta_info_insert_rcu(sta)) 597 return sta_info_get(sdata, addr); 598 return sta; 599} 600 601static struct sta_info * 602ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 603 const u8 *addr, u32 supp_rates) 604 __acquires(RCU) 605{ 606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 607 struct ieee80211_local *local = sdata->local; 608 struct sta_info *sta; 609 struct ieee80211_chanctx_conf *chanctx_conf; 610 struct ieee80211_supported_band *sband; 611 enum nl80211_bss_scan_width scan_width; 612 int band; 613 614 /* 615 * XXX: Consider removing the least recently used entry and 616 * allow new one to be added. 617 */ 618 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 620 sdata->name, addr); 621 rcu_read_lock(); 622 return NULL; 623 } 624 625 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 626 rcu_read_lock(); 627 return NULL; 628 } 629 630 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 631 rcu_read_lock(); 632 return NULL; 633 } 634 635 rcu_read_lock(); 636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 637 if (WARN_ON_ONCE(!chanctx_conf)) 638 return NULL; 639 band = chanctx_conf->def.chan->band; 640 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 641 rcu_read_unlock(); 642 643 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 644 if (!sta) { 645 rcu_read_lock(); 646 return NULL; 647 } 648 649 sta->last_rx = jiffies; 650 651 /* make sure mandatory rates are always added */ 652 sband = local->hw.wiphy->bands[band]; 653 sta->sta.supp_rates[band] = supp_rates | 654 ieee80211_mandatory_rates(sband, scan_width); 655 656 return ieee80211_ibss_finish_sta(sta); 657} 658 659static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 660{ 661 struct ieee80211_local *local = sdata->local; 662 int active = 0; 663 struct sta_info *sta; 664 665 sdata_assert_lock(sdata); 666 667 rcu_read_lock(); 668 669 list_for_each_entry_rcu(sta, &local->sta_list, list) { 670 if (sta->sdata == sdata && 671 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 672 jiffies)) { 673 active++; 674 break; 675 } 676 } 677 678 rcu_read_unlock(); 679 680 return active; 681} 682 683static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 684{ 685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 686 struct ieee80211_local *local = sdata->local; 687 struct cfg80211_bss *cbss; 688 struct beacon_data *presp; 689 struct sta_info *sta; 690 691 if (!is_zero_ether_addr(ifibss->bssid)) { 692 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 693 ifibss->bssid, ifibss->ssid, 694 ifibss->ssid_len, 695 IEEE80211_BSS_TYPE_IBSS, 696 IEEE80211_PRIVACY(ifibss->privacy)); 697 698 if (cbss) { 699 cfg80211_unlink_bss(local->hw.wiphy, cbss); 700 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 701 } 702 } 703 704 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 705 706 sta_info_flush(sdata); 707 708 spin_lock_bh(&ifibss->incomplete_lock); 709 while (!list_empty(&ifibss->incomplete_stations)) { 710 sta = list_first_entry(&ifibss->incomplete_stations, 711 struct sta_info, list); 712 list_del(&sta->list); 713 spin_unlock_bh(&ifibss->incomplete_lock); 714 715 sta_info_free(local, sta); 716 spin_lock_bh(&ifibss->incomplete_lock); 717 } 718 spin_unlock_bh(&ifibss->incomplete_lock); 719 720 netif_carrier_off(sdata->dev); 721 722 sdata->vif.bss_conf.ibss_joined = false; 723 sdata->vif.bss_conf.ibss_creator = false; 724 sdata->vif.bss_conf.enable_beacon = false; 725 sdata->vif.bss_conf.ssid_len = 0; 726 727 /* remove beacon */ 728 presp = rcu_dereference_protected(ifibss->presp, 729 lockdep_is_held(&sdata->wdev.mtx)); 730 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 731 if (presp) 732 kfree_rcu(presp, rcu_head); 733 734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 736 BSS_CHANGED_IBSS); 737 drv_leave_ibss(local, sdata); 738 mutex_lock(&local->mtx); 739 ieee80211_vif_release_channel(sdata); 740 mutex_unlock(&local->mtx); 741} 742 743static void ieee80211_csa_connection_drop_work(struct work_struct *work) 744{ 745 struct ieee80211_sub_if_data *sdata = 746 container_of(work, struct ieee80211_sub_if_data, 747 u.ibss.csa_connection_drop_work); 748 749 sdata_lock(sdata); 750 751 ieee80211_ibss_disconnect(sdata); 752 synchronize_rcu(); 753 skb_queue_purge(&sdata->skb_queue); 754 755 /* trigger a scan to find another IBSS network to join */ 756 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 757 758 sdata_unlock(sdata); 759} 760 761static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 762{ 763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 764 int err; 765 766 /* if the current channel is a DFS channel, mark the channel as 767 * unavailable. 768 */ 769 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 770 &ifibss->chandef, 771 NL80211_IFTYPE_ADHOC); 772 if (err > 0) 773 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 774 GFP_ATOMIC); 775} 776 777static bool 778ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 779 struct ieee802_11_elems *elems, 780 bool beacon) 781{ 782 struct cfg80211_csa_settings params; 783 struct ieee80211_csa_ie csa_ie; 784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 785 enum nl80211_channel_type ch_type; 786 int err; 787 u32 sta_flags; 788 789 sdata_assert_lock(sdata); 790 791 sta_flags = IEEE80211_STA_DISABLE_VHT; 792 switch (ifibss->chandef.width) { 793 case NL80211_CHAN_WIDTH_5: 794 case NL80211_CHAN_WIDTH_10: 795 case NL80211_CHAN_WIDTH_20_NOHT: 796 sta_flags |= IEEE80211_STA_DISABLE_HT; 797 /* fall through */ 798 case NL80211_CHAN_WIDTH_20: 799 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 800 break; 801 default: 802 break; 803 } 804 805 memset(¶ms, 0, sizeof(params)); 806 memset(&csa_ie, 0, sizeof(csa_ie)); 807 err = ieee80211_parse_ch_switch_ie(sdata, elems, 808 ifibss->chandef.chan->band, 809 sta_flags, ifibss->bssid, &csa_ie); 810 /* can't switch to destination channel, fail */ 811 if (err < 0) 812 goto disconnect; 813 814 /* did not contain a CSA */ 815 if (err) 816 return false; 817 818 /* channel switch is not supported, disconnect */ 819 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 820 goto disconnect; 821 822 params.count = csa_ie.count; 823 params.chandef = csa_ie.chandef; 824 825 switch (ifibss->chandef.width) { 826 case NL80211_CHAN_WIDTH_20_NOHT: 827 case NL80211_CHAN_WIDTH_20: 828 case NL80211_CHAN_WIDTH_40: 829 /* keep our current HT mode (HT20/HT40+/HT40-), even if 830 * another mode has been announced. The mode is not adopted 831 * within the beacon while doing CSA and we should therefore 832 * keep the mode which we announce. 833 */ 834 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 835 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 836 ch_type); 837 break; 838 case NL80211_CHAN_WIDTH_5: 839 case NL80211_CHAN_WIDTH_10: 840 if (params.chandef.width != ifibss->chandef.width) { 841 sdata_info(sdata, 842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 843 ifibss->bssid, 844 params.chandef.chan->center_freq, 845 params.chandef.width, 846 params.chandef.center_freq1, 847 params.chandef.center_freq2); 848 goto disconnect; 849 } 850 break; 851 default: 852 /* should not happen, sta_flags should prevent VHT modes. */ 853 WARN_ON(1); 854 goto disconnect; 855 } 856 857 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 858 NL80211_IFTYPE_ADHOC)) { 859 sdata_info(sdata, 860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 861 ifibss->bssid, 862 params.chandef.chan->center_freq, 863 params.chandef.width, 864 params.chandef.center_freq1, 865 params.chandef.center_freq2); 866 goto disconnect; 867 } 868 869 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 870 ¶ms.chandef, 871 NL80211_IFTYPE_ADHOC); 872 if (err < 0) 873 goto disconnect; 874 if (err > 0 && !ifibss->userspace_handles_dfs) { 875 /* IBSS-DFS only allowed with a control program */ 876 goto disconnect; 877 } 878 879 params.radar_required = err; 880 881 if (cfg80211_chandef_identical(¶ms.chandef, 882 &sdata->vif.bss_conf.chandef)) { 883 ibss_dbg(sdata, 884 "received csa with an identical chandef, ignoring\n"); 885 return true; 886 } 887 888 /* all checks done, now perform the channel switch. */ 889 ibss_dbg(sdata, 890 "received channel switch announcement to go to channel %d MHz\n", 891 params.chandef.chan->center_freq); 892 893 params.block_tx = !!csa_ie.mode; 894 895 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 896 ¶ms)) 897 goto disconnect; 898 899 ieee80211_ibss_csa_mark_radar(sdata); 900 901 return true; 902disconnect: 903 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 904 ieee80211_queue_work(&sdata->local->hw, 905 &ifibss->csa_connection_drop_work); 906 907 ieee80211_ibss_csa_mark_radar(sdata); 908 909 return true; 910} 911 912static void 913ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 914 struct ieee80211_mgmt *mgmt, size_t len, 915 struct ieee80211_rx_status *rx_status, 916 struct ieee802_11_elems *elems) 917{ 918 int required_len; 919 920 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 921 return; 922 923 /* CSA is the only action we handle for now */ 924 if (mgmt->u.action.u.measurement.action_code != 925 WLAN_ACTION_SPCT_CHL_SWITCH) 926 return; 927 928 required_len = IEEE80211_MIN_ACTION_SIZE + 929 sizeof(mgmt->u.action.u.chan_switch); 930 if (len < required_len) 931 return; 932 933 if (!sdata->vif.csa_active) 934 ieee80211_ibss_process_chanswitch(sdata, elems, false); 935} 936 937static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 938 struct ieee80211_mgmt *mgmt, 939 size_t len) 940{ 941 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 942 943 if (len < IEEE80211_DEAUTH_FRAME_LEN) 944 return; 945 946 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 947 mgmt->sa, mgmt->da, mgmt->bssid, reason); 948 sta_info_destroy_addr(sdata, mgmt->sa); 949} 950 951static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 952 struct ieee80211_mgmt *mgmt, 953 size_t len) 954{ 955 u16 auth_alg, auth_transaction; 956 957 sdata_assert_lock(sdata); 958 959 if (len < 24 + 6) 960 return; 961 962 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 963 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 964 965 ibss_dbg(sdata, 966 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 967 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 968 969 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 970 return; 971 972 /* 973 * IEEE 802.11 standard does not require authentication in IBSS 974 * networks and most implementations do not seem to use it. 975 * However, try to reply to authentication attempts if someone 976 * has actually implemented this. 977 */ 978 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 979 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 980} 981 982static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 983 struct ieee80211_mgmt *mgmt, size_t len, 984 struct ieee80211_rx_status *rx_status, 985 struct ieee802_11_elems *elems, 986 struct ieee80211_channel *channel) 987{ 988 struct sta_info *sta; 989 enum ieee80211_band band = rx_status->band; 990 enum nl80211_bss_scan_width scan_width; 991 struct ieee80211_local *local = sdata->local; 992 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 993 bool rates_updated = false; 994 u32 supp_rates = 0; 995 996 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 997 return; 998 999 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1000 return; 1001 1002 rcu_read_lock(); 1003 sta = sta_info_get(sdata, mgmt->sa); 1004 1005 if (elems->supp_rates) { 1006 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1007 band, NULL); 1008 if (sta) { 1009 u32 prev_rates; 1010 1011 prev_rates = sta->sta.supp_rates[band]; 1012 /* make sure mandatory rates are always added */ 1013 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1014 if (rx_status->flag & RX_FLAG_5MHZ) 1015 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1016 if (rx_status->flag & RX_FLAG_10MHZ) 1017 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1018 1019 sta->sta.supp_rates[band] = supp_rates | 1020 ieee80211_mandatory_rates(sband, scan_width); 1021 if (sta->sta.supp_rates[band] != prev_rates) { 1022 ibss_dbg(sdata, 1023 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1024 sta->sta.addr, prev_rates, 1025 sta->sta.supp_rates[band]); 1026 rates_updated = true; 1027 } 1028 } else { 1029 rcu_read_unlock(); 1030 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1031 mgmt->sa, supp_rates); 1032 } 1033 } 1034 1035 if (sta && elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) 1036 sta->sta.wme = true; 1037 1038 if (sta && elems->ht_operation && elems->ht_cap_elem && 1039 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1042 /* we both use HT */ 1043 struct ieee80211_ht_cap htcap_ie; 1044 struct cfg80211_chan_def chandef; 1045 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1046 1047 ieee80211_ht_oper_to_chandef(channel, 1048 elems->ht_operation, 1049 &chandef); 1050 1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1053 &htcap_ie, 1054 sta); 1055 1056 if (elems->vht_operation && elems->vht_cap_elem && 1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1059 /* we both use VHT */ 1060 struct ieee80211_vht_cap cap_ie; 1061 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1062 1063 ieee80211_vht_oper_to_chandef(channel, 1064 elems->vht_operation, 1065 &chandef); 1066 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1067 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1068 &cap_ie, sta); 1069 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1070 rates_updated |= true; 1071 } 1072 1073 if (bw != sta->sta.bandwidth) 1074 rates_updated |= true; 1075 1076 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1077 &chandef)) 1078 WARN_ON_ONCE(1); 1079 } 1080 1081 if (sta && rates_updated) { 1082 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1083 u8 rx_nss = sta->sta.rx_nss; 1084 1085 /* Force rx_nss recalculation */ 1086 sta->sta.rx_nss = 0; 1087 rate_control_rate_init(sta); 1088 if (sta->sta.rx_nss != rx_nss) 1089 changed |= IEEE80211_RC_NSS_CHANGED; 1090 1091 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1092 } 1093 1094 rcu_read_unlock(); 1095} 1096 1097static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1098 struct ieee80211_mgmt *mgmt, size_t len, 1099 struct ieee80211_rx_status *rx_status, 1100 struct ieee802_11_elems *elems) 1101{ 1102 struct ieee80211_local *local = sdata->local; 1103 struct cfg80211_bss *cbss; 1104 struct ieee80211_bss *bss; 1105 struct ieee80211_channel *channel; 1106 u64 beacon_timestamp, rx_timestamp; 1107 u32 supp_rates = 0; 1108 enum ieee80211_band band = rx_status->band; 1109 1110 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1111 if (!channel) 1112 return; 1113 1114 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1115 1116 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1117 channel); 1118 if (!bss) 1119 return; 1120 1121 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1122 1123 /* same for beacon and probe response */ 1124 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1125 1126 /* check if we need to merge IBSS */ 1127 1128 /* not an IBSS */ 1129 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1130 goto put_bss; 1131 1132 /* different channel */ 1133 if (sdata->u.ibss.fixed_channel && 1134 sdata->u.ibss.chandef.chan != cbss->channel) 1135 goto put_bss; 1136 1137 /* different SSID */ 1138 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1139 memcmp(elems->ssid, sdata->u.ibss.ssid, 1140 sdata->u.ibss.ssid_len)) 1141 goto put_bss; 1142 1143 /* process channel switch */ 1144 if (sdata->vif.csa_active || 1145 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1146 goto put_bss; 1147 1148 /* same BSSID */ 1149 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1150 goto put_bss; 1151 1152 /* we use a fixed BSSID */ 1153 if (sdata->u.ibss.fixed_bssid) 1154 goto put_bss; 1155 1156 if (ieee80211_have_rx_timestamp(rx_status)) { 1157 /* time when timestamp field was received */ 1158 rx_timestamp = 1159 ieee80211_calculate_rx_timestamp(local, rx_status, 1160 len + FCS_LEN, 24); 1161 } else { 1162 /* 1163 * second best option: get current TSF 1164 * (will return -1 if not supported) 1165 */ 1166 rx_timestamp = drv_get_tsf(local, sdata); 1167 } 1168 1169 ibss_dbg(sdata, 1170 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1171 mgmt->sa, mgmt->bssid, 1172 (unsigned long long)rx_timestamp, 1173 (unsigned long long)beacon_timestamp, 1174 (unsigned long long)(rx_timestamp - beacon_timestamp), 1175 jiffies); 1176 1177 if (beacon_timestamp > rx_timestamp) { 1178 ibss_dbg(sdata, 1179 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1180 mgmt->bssid); 1181 ieee80211_sta_join_ibss(sdata, bss); 1182 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1183 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1184 supp_rates); 1185 rcu_read_unlock(); 1186 } 1187 1188 put_bss: 1189 ieee80211_rx_bss_put(local, bss); 1190} 1191 1192void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1193 const u8 *bssid, const u8 *addr, 1194 u32 supp_rates) 1195{ 1196 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1197 struct ieee80211_local *local = sdata->local; 1198 struct sta_info *sta; 1199 struct ieee80211_chanctx_conf *chanctx_conf; 1200 struct ieee80211_supported_band *sband; 1201 enum nl80211_bss_scan_width scan_width; 1202 int band; 1203 1204 /* 1205 * XXX: Consider removing the least recently used entry and 1206 * allow new one to be added. 1207 */ 1208 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1209 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1210 sdata->name, addr); 1211 return; 1212 } 1213 1214 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1215 return; 1216 1217 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1218 return; 1219 1220 rcu_read_lock(); 1221 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1222 if (WARN_ON_ONCE(!chanctx_conf)) { 1223 rcu_read_unlock(); 1224 return; 1225 } 1226 band = chanctx_conf->def.chan->band; 1227 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1228 rcu_read_unlock(); 1229 1230 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1231 if (!sta) 1232 return; 1233 1234 sta->last_rx = jiffies; 1235 1236 /* make sure mandatory rates are always added */ 1237 sband = local->hw.wiphy->bands[band]; 1238 sta->sta.supp_rates[band] = supp_rates | 1239 ieee80211_mandatory_rates(sband, scan_width); 1240 1241 spin_lock(&ifibss->incomplete_lock); 1242 list_add(&sta->list, &ifibss->incomplete_stations); 1243 spin_unlock(&ifibss->incomplete_lock); 1244 ieee80211_queue_work(&local->hw, &sdata->work); 1245} 1246 1247static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1248{ 1249 struct ieee80211_local *local = sdata->local; 1250 struct sta_info *sta, *tmp; 1251 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1252 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1253 1254 mutex_lock(&local->sta_mtx); 1255 1256 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1257 if (sdata != sta->sdata) 1258 continue; 1259 1260 if (time_after(jiffies, sta->last_rx + exp_time) || 1261 (time_after(jiffies, sta->last_rx + exp_rsn_time) && 1262 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1263 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1264 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1265 "not authorized " : "", sta->sta.addr); 1266 1267 WARN_ON(__sta_info_destroy(sta)); 1268 } 1269 } 1270 1271 mutex_unlock(&local->sta_mtx); 1272} 1273 1274/* 1275 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1276 */ 1277 1278static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1279{ 1280 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1281 enum nl80211_bss_scan_width scan_width; 1282 1283 sdata_assert_lock(sdata); 1284 1285 mod_timer(&ifibss->timer, 1286 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1287 1288 ieee80211_ibss_sta_expire(sdata); 1289 1290 if (time_before(jiffies, ifibss->last_scan_completed + 1291 IEEE80211_IBSS_MERGE_INTERVAL)) 1292 return; 1293 1294 if (ieee80211_sta_active_ibss(sdata)) 1295 return; 1296 1297 if (ifibss->fixed_channel) 1298 return; 1299 1300 sdata_info(sdata, 1301 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1302 1303 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1304 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1305 NULL, 0, scan_width); 1306} 1307 1308static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1309{ 1310 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1311 u8 bssid[ETH_ALEN]; 1312 u16 capability; 1313 int i; 1314 1315 sdata_assert_lock(sdata); 1316 1317 if (ifibss->fixed_bssid) { 1318 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1319 } else { 1320 /* Generate random, not broadcast, locally administered BSSID. Mix in 1321 * own MAC address to make sure that devices that do not have proper 1322 * random number generator get different BSSID. */ 1323 get_random_bytes(bssid, ETH_ALEN); 1324 for (i = 0; i < ETH_ALEN; i++) 1325 bssid[i] ^= sdata->vif.addr[i]; 1326 bssid[0] &= ~0x01; 1327 bssid[0] |= 0x02; 1328 } 1329 1330 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1331 1332 capability = WLAN_CAPABILITY_IBSS; 1333 1334 if (ifibss->privacy) 1335 capability |= WLAN_CAPABILITY_PRIVACY; 1336 1337 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1338 &ifibss->chandef, ifibss->basic_rates, 1339 capability, 0, true); 1340} 1341 1342static unsigned ibss_setup_channels(struct wiphy *wiphy, 1343 struct ieee80211_channel **channels, 1344 unsigned int channels_max, 1345 u32 center_freq, u32 width) 1346{ 1347 struct ieee80211_channel *chan = NULL; 1348 unsigned int n_chan = 0; 1349 u32 start_freq, end_freq, freq; 1350 1351 if (width <= 20) { 1352 start_freq = center_freq; 1353 end_freq = center_freq; 1354 } else { 1355 start_freq = center_freq - width / 2 + 10; 1356 end_freq = center_freq + width / 2 - 10; 1357 } 1358 1359 for (freq = start_freq; freq <= end_freq; freq += 20) { 1360 chan = ieee80211_get_channel(wiphy, freq); 1361 if (!chan) 1362 continue; 1363 if (n_chan >= channels_max) 1364 return n_chan; 1365 1366 channels[n_chan] = chan; 1367 n_chan++; 1368 } 1369 1370 return n_chan; 1371} 1372 1373static unsigned int 1374ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1375 const struct cfg80211_chan_def *chandef, 1376 struct ieee80211_channel **channels, 1377 unsigned int channels_max) 1378{ 1379 unsigned int n_chan = 0; 1380 u32 width, cf1, cf2 = 0; 1381 1382 switch (chandef->width) { 1383 case NL80211_CHAN_WIDTH_40: 1384 width = 40; 1385 break; 1386 case NL80211_CHAN_WIDTH_80P80: 1387 cf2 = chandef->center_freq2; 1388 /* fall through */ 1389 case NL80211_CHAN_WIDTH_80: 1390 width = 80; 1391 break; 1392 case NL80211_CHAN_WIDTH_160: 1393 width = 160; 1394 break; 1395 default: 1396 width = 20; 1397 break; 1398 } 1399 1400 cf1 = chandef->center_freq1; 1401 1402 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1403 1404 if (cf2) 1405 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1406 channels_max - n_chan, cf2, 1407 width); 1408 1409 return n_chan; 1410} 1411 1412/* 1413 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1414 */ 1415 1416static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1417{ 1418 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1419 struct ieee80211_local *local = sdata->local; 1420 struct cfg80211_bss *cbss; 1421 struct ieee80211_channel *chan = NULL; 1422 const u8 *bssid = NULL; 1423 enum nl80211_bss_scan_width scan_width; 1424 int active_ibss; 1425 1426 sdata_assert_lock(sdata); 1427 1428 active_ibss = ieee80211_sta_active_ibss(sdata); 1429 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1430 1431 if (active_ibss) 1432 return; 1433 1434 if (ifibss->fixed_bssid) 1435 bssid = ifibss->bssid; 1436 if (ifibss->fixed_channel) 1437 chan = ifibss->chandef.chan; 1438 if (!is_zero_ether_addr(ifibss->bssid)) 1439 bssid = ifibss->bssid; 1440 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1441 ifibss->ssid, ifibss->ssid_len, 1442 IEEE80211_BSS_TYPE_IBSS, 1443 IEEE80211_PRIVACY(ifibss->privacy)); 1444 1445 if (cbss) { 1446 struct ieee80211_bss *bss; 1447 1448 bss = (void *)cbss->priv; 1449 ibss_dbg(sdata, 1450 "sta_find_ibss: selected %pM current %pM\n", 1451 cbss->bssid, ifibss->bssid); 1452 sdata_info(sdata, 1453 "Selected IBSS BSSID %pM based on configured SSID\n", 1454 cbss->bssid); 1455 1456 ieee80211_sta_join_ibss(sdata, bss); 1457 ieee80211_rx_bss_put(local, bss); 1458 return; 1459 } 1460 1461 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1462 * directly and do not waste time scanning 1463 */ 1464 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1465 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1466 bssid); 1467 ieee80211_sta_create_ibss(sdata); 1468 return; 1469 } 1470 1471 1472 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1473 1474 /* Selected IBSS not found in current scan results - try to scan */ 1475 if (time_after(jiffies, ifibss->last_scan_completed + 1476 IEEE80211_SCAN_INTERVAL)) { 1477 struct ieee80211_channel *channels[8]; 1478 unsigned int num; 1479 1480 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1481 1482 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1483 &ifibss->chandef, 1484 channels, 1485 ARRAY_SIZE(channels)); 1486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1487 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1488 ifibss->ssid_len, channels, num, 1489 scan_width); 1490 } else { 1491 int interval = IEEE80211_SCAN_INTERVAL; 1492 1493 if (time_after(jiffies, ifibss->ibss_join_req + 1494 IEEE80211_IBSS_JOIN_TIMEOUT)) 1495 ieee80211_sta_create_ibss(sdata); 1496 1497 mod_timer(&ifibss->timer, 1498 round_jiffies(jiffies + interval)); 1499 } 1500} 1501 1502static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1503 struct sk_buff *req) 1504{ 1505 struct ieee80211_mgmt *mgmt = (void *)req->data; 1506 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1507 struct ieee80211_local *local = sdata->local; 1508 int tx_last_beacon, len = req->len; 1509 struct sk_buff *skb; 1510 struct beacon_data *presp; 1511 u8 *pos, *end; 1512 1513 sdata_assert_lock(sdata); 1514 1515 presp = rcu_dereference_protected(ifibss->presp, 1516 lockdep_is_held(&sdata->wdev.mtx)); 1517 1518 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1519 len < 24 + 2 || !presp) 1520 return; 1521 1522 tx_last_beacon = drv_tx_last_beacon(local); 1523 1524 ibss_dbg(sdata, 1525 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1526 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1527 1528 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1529 return; 1530 1531 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1532 !is_broadcast_ether_addr(mgmt->bssid)) 1533 return; 1534 1535 end = ((u8 *) mgmt) + len; 1536 pos = mgmt->u.probe_req.variable; 1537 if (pos[0] != WLAN_EID_SSID || 1538 pos + 2 + pos[1] > end) { 1539 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1540 mgmt->sa); 1541 return; 1542 } 1543 if (pos[1] != 0 && 1544 (pos[1] != ifibss->ssid_len || 1545 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1546 /* Ignore ProbeReq for foreign SSID */ 1547 return; 1548 } 1549 1550 /* Reply with ProbeResp */ 1551 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1552 if (!skb) 1553 return; 1554 1555 skb_reserve(skb, local->tx_headroom); 1556 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1557 1558 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1559 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1560 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1561 1562 /* avoid excessive retries for probe request to wildcard SSIDs */ 1563 if (pos[1] == 0) 1564 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1565 1566 ieee80211_tx_skb(sdata, skb); 1567} 1568 1569static 1570void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1571 struct ieee80211_mgmt *mgmt, size_t len, 1572 struct ieee80211_rx_status *rx_status) 1573{ 1574 size_t baselen; 1575 struct ieee802_11_elems elems; 1576 1577 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1578 offsetof(typeof(mgmt->u.beacon), variable)); 1579 1580 /* 1581 * either beacon or probe_resp but the variable field is at the 1582 * same offset 1583 */ 1584 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1585 if (baselen > len) 1586 return; 1587 1588 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1589 false, &elems); 1590 1591 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1592} 1593 1594void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1595 struct sk_buff *skb) 1596{ 1597 struct ieee80211_rx_status *rx_status; 1598 struct ieee80211_mgmt *mgmt; 1599 u16 fc; 1600 struct ieee802_11_elems elems; 1601 int ies_len; 1602 1603 rx_status = IEEE80211_SKB_RXCB(skb); 1604 mgmt = (struct ieee80211_mgmt *) skb->data; 1605 fc = le16_to_cpu(mgmt->frame_control); 1606 1607 sdata_lock(sdata); 1608 1609 if (!sdata->u.ibss.ssid_len) 1610 goto mgmt_out; /* not ready to merge yet */ 1611 1612 switch (fc & IEEE80211_FCTL_STYPE) { 1613 case IEEE80211_STYPE_PROBE_REQ: 1614 ieee80211_rx_mgmt_probe_req(sdata, skb); 1615 break; 1616 case IEEE80211_STYPE_PROBE_RESP: 1617 case IEEE80211_STYPE_BEACON: 1618 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1619 rx_status); 1620 break; 1621 case IEEE80211_STYPE_AUTH: 1622 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1623 break; 1624 case IEEE80211_STYPE_DEAUTH: 1625 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1626 break; 1627 case IEEE80211_STYPE_ACTION: 1628 switch (mgmt->u.action.category) { 1629 case WLAN_CATEGORY_SPECTRUM_MGMT: 1630 ies_len = skb->len - 1631 offsetof(struct ieee80211_mgmt, 1632 u.action.u.chan_switch.variable); 1633 1634 if (ies_len < 0) 1635 break; 1636 1637 ieee802_11_parse_elems( 1638 mgmt->u.action.u.chan_switch.variable, 1639 ies_len, true, &elems); 1640 1641 if (elems.parse_error) 1642 break; 1643 1644 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1645 rx_status, &elems); 1646 break; 1647 } 1648 } 1649 1650 mgmt_out: 1651 sdata_unlock(sdata); 1652} 1653 1654void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1655{ 1656 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1657 struct sta_info *sta; 1658 1659 sdata_lock(sdata); 1660 1661 /* 1662 * Work could be scheduled after scan or similar 1663 * when we aren't even joined (or trying) with a 1664 * network. 1665 */ 1666 if (!ifibss->ssid_len) 1667 goto out; 1668 1669 spin_lock_bh(&ifibss->incomplete_lock); 1670 while (!list_empty(&ifibss->incomplete_stations)) { 1671 sta = list_first_entry(&ifibss->incomplete_stations, 1672 struct sta_info, list); 1673 list_del(&sta->list); 1674 spin_unlock_bh(&ifibss->incomplete_lock); 1675 1676 ieee80211_ibss_finish_sta(sta); 1677 rcu_read_unlock(); 1678 spin_lock_bh(&ifibss->incomplete_lock); 1679 } 1680 spin_unlock_bh(&ifibss->incomplete_lock); 1681 1682 switch (ifibss->state) { 1683 case IEEE80211_IBSS_MLME_SEARCH: 1684 ieee80211_sta_find_ibss(sdata); 1685 break; 1686 case IEEE80211_IBSS_MLME_JOINED: 1687 ieee80211_sta_merge_ibss(sdata); 1688 break; 1689 default: 1690 WARN_ON(1); 1691 break; 1692 } 1693 1694 out: 1695 sdata_unlock(sdata); 1696} 1697 1698static void ieee80211_ibss_timer(unsigned long data) 1699{ 1700 struct ieee80211_sub_if_data *sdata = 1701 (struct ieee80211_sub_if_data *) data; 1702 1703 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1704} 1705 1706void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1707{ 1708 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1709 1710 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1711 (unsigned long) sdata); 1712 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1713 spin_lock_init(&ifibss->incomplete_lock); 1714 INIT_WORK(&ifibss->csa_connection_drop_work, 1715 ieee80211_csa_connection_drop_work); 1716} 1717 1718/* scan finished notification */ 1719void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1720{ 1721 struct ieee80211_sub_if_data *sdata; 1722 1723 mutex_lock(&local->iflist_mtx); 1724 list_for_each_entry(sdata, &local->interfaces, list) { 1725 if (!ieee80211_sdata_running(sdata)) 1726 continue; 1727 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1728 continue; 1729 sdata->u.ibss.last_scan_completed = jiffies; 1730 } 1731 mutex_unlock(&local->iflist_mtx); 1732} 1733 1734int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1735 struct cfg80211_ibss_params *params) 1736{ 1737 u32 changed = 0; 1738 u32 rate_flags; 1739 struct ieee80211_supported_band *sband; 1740 enum ieee80211_chanctx_mode chanmode; 1741 struct ieee80211_local *local = sdata->local; 1742 int radar_detect_width = 0; 1743 int i; 1744 int ret; 1745 1746 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1747 ¶ms->chandef, 1748 sdata->wdev.iftype); 1749 if (ret < 0) 1750 return ret; 1751 1752 if (ret > 0) { 1753 if (!params->userspace_handles_dfs) 1754 return -EINVAL; 1755 radar_detect_width = BIT(params->chandef.width); 1756 } 1757 1758 chanmode = (params->channel_fixed && !ret) ? 1759 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1760 1761 mutex_lock(&local->chanctx_mtx); 1762 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1763 radar_detect_width); 1764 mutex_unlock(&local->chanctx_mtx); 1765 if (ret < 0) 1766 return ret; 1767 1768 if (params->bssid) { 1769 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1770 sdata->u.ibss.fixed_bssid = true; 1771 } else 1772 sdata->u.ibss.fixed_bssid = false; 1773 1774 sdata->u.ibss.privacy = params->privacy; 1775 sdata->u.ibss.control_port = params->control_port; 1776 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1777 sdata->u.ibss.basic_rates = params->basic_rates; 1778 sdata->u.ibss.last_scan_completed = jiffies; 1779 1780 /* fix basic_rates if channel does not support these rates */ 1781 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1782 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1783 for (i = 0; i < sband->n_bitrates; i++) { 1784 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1785 sdata->u.ibss.basic_rates &= ~BIT(i); 1786 } 1787 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1788 sizeof(params->mcast_rate)); 1789 1790 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1791 1792 sdata->u.ibss.chandef = params->chandef; 1793 sdata->u.ibss.fixed_channel = params->channel_fixed; 1794 1795 if (params->ie) { 1796 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1797 GFP_KERNEL); 1798 if (sdata->u.ibss.ie) 1799 sdata->u.ibss.ie_len = params->ie_len; 1800 } 1801 1802 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1803 sdata->u.ibss.ibss_join_req = jiffies; 1804 1805 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1806 sdata->u.ibss.ssid_len = params->ssid_len; 1807 1808 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1809 sizeof(sdata->u.ibss.ht_capa)); 1810 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1811 sizeof(sdata->u.ibss.ht_capa_mask)); 1812 1813 /* 1814 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1815 * reserved, but an HT STA shall protect HT transmissions as though 1816 * the HT Protection field were set to non-HT mixed mode. 1817 * 1818 * In an IBSS, the RIFS Mode field of the HT Operation element is 1819 * also reserved, but an HT STA shall operate as though this field 1820 * were set to 1. 1821 */ 1822 1823 sdata->vif.bss_conf.ht_operation_mode |= 1824 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1825 | IEEE80211_HT_PARAM_RIFS_MODE; 1826 1827 changed |= BSS_CHANGED_HT; 1828 ieee80211_bss_info_change_notify(sdata, changed); 1829 1830 sdata->smps_mode = IEEE80211_SMPS_OFF; 1831 sdata->needed_rx_chains = local->rx_chains; 1832 1833 ieee80211_queue_work(&local->hw, &sdata->work); 1834 1835 return 0; 1836} 1837 1838int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1839{ 1840 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1841 1842 ieee80211_ibss_disconnect(sdata); 1843 ifibss->ssid_len = 0; 1844 eth_zero_addr(ifibss->bssid); 1845 1846 /* remove beacon */ 1847 kfree(sdata->u.ibss.ie); 1848 1849 /* on the next join, re-program HT parameters */ 1850 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1851 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1852 1853 synchronize_rcu(); 1854 1855 skb_queue_purge(&sdata->skb_queue); 1856 1857 del_timer_sync(&sdata->u.ibss.timer); 1858 1859 return 0; 1860} 1861