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 * Copyright(c) 2016 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17#include <linux/delay.h> 18#include <linux/slab.h> 19#include <linux/if_ether.h> 20#include <linux/skbuff.h> 21#include <linux/if_arp.h> 22#include <linux/etherdevice.h> 23#include <linux/rtnetlink.h> 24#include <net/mac80211.h> 25 26#include "ieee80211_i.h" 27#include "driver-ops.h" 28#include "rate.h" 29 30#define IEEE80211_SCAN_INTERVAL (2 * HZ) 31#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 32 33#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 34#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 35#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 36 37#define IEEE80211_IBSS_MAX_STA_ENTRIES 128 38 39static struct beacon_data * 40ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 41 const int beacon_int, const u32 basic_rates, 42 const u16 capability, u64 tsf, 43 struct cfg80211_chan_def *chandef, 44 bool *have_higher_than_11mbit, 45 struct cfg80211_csa_settings *csa_settings) 46{ 47 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 48 struct ieee80211_local *local = sdata->local; 49 int rates_n = 0, i, ri; 50 struct ieee80211_mgmt *mgmt; 51 u8 *pos; 52 struct ieee80211_supported_band *sband; 53 u32 rate_flags, rates = 0, rates_added = 0; 54 struct beacon_data *presp; 55 int frame_len; 56 int shift; 57 58 /* Build IBSS probe response */ 59 frame_len = sizeof(struct ieee80211_hdr_3addr) + 60 12 /* struct ieee80211_mgmt.u.beacon */ + 61 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 62 2 + 8 /* max Supported Rates */ + 63 3 /* max DS params */ + 64 4 /* IBSS params */ + 65 5 /* Channel Switch Announcement */ + 66 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 67 2 + sizeof(struct ieee80211_ht_cap) + 68 2 + sizeof(struct ieee80211_ht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == IEEE80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->csa_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->csa_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213error: 214 kfree(presp); 215 return NULL; 216} 217 218static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224{ 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.bss_conf.ibss_joined) { 248 sdata->vif.bss_conf.ibss_joined = false; 249 sdata->vif.bss_conf.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = rcu_dereference_protected(ifibss->presp, 259 lockdep_is_held(&sdata->wdev.mtx)); 260 RCU_INIT_POINTER(ifibss->presp, NULL); 261 if (presp) 262 kfree_rcu(presp, rcu_head); 263 264 /* make a copy of the chandef, it could be modified below. */ 265 chandef = *req_chandef; 266 chan = chandef.chan; 267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 268 NL80211_IFTYPE_ADHOC)) { 269 if (chandef.width == NL80211_CHAN_WIDTH_5 || 270 chandef.width == NL80211_CHAN_WIDTH_10 || 271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 272 chandef.width == NL80211_CHAN_WIDTH_20) { 273 sdata_info(sdata, 274 "Failed to join IBSS, beacons forbidden\n"); 275 return; 276 } 277 chandef.width = NL80211_CHAN_WIDTH_20; 278 chandef.center_freq1 = chan->center_freq; 279 /* check again for downgraded chandef */ 280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 281 NL80211_IFTYPE_ADHOC)) { 282 sdata_info(sdata, 283 "Failed to join IBSS, beacons forbidden\n"); 284 return; 285 } 286 } 287 288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 289 &chandef, NL80211_IFTYPE_ADHOC); 290 if (err < 0) { 291 sdata_info(sdata, 292 "Failed to join IBSS, invalid chandef\n"); 293 return; 294 } 295 if (err > 0 && !ifibss->userspace_handles_dfs) { 296 sdata_info(sdata, 297 "Failed to join IBSS, DFS channel without control program\n"); 298 return; 299 } 300 301 radar_required = err; 302 303 mutex_lock(&local->mtx); 304 if (ieee80211_vif_use_channel(sdata, &chandef, 305 ifibss->fixed_channel ? 306 IEEE80211_CHANCTX_SHARED : 307 IEEE80211_CHANCTX_EXCLUSIVE)) { 308 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 309 mutex_unlock(&local->mtx); 310 return; 311 } 312 sdata->radar_required = radar_required; 313 mutex_unlock(&local->mtx); 314 315 memcpy(ifibss->bssid, bssid, ETH_ALEN); 316 317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 318 capability, tsf, &chandef, 319 &have_higher_than_11mbit, NULL); 320 if (!presp) 321 return; 322 323 rcu_assign_pointer(ifibss->presp, presp); 324 mgmt = (void *)presp->head; 325 326 sdata->vif.bss_conf.enable_beacon = true; 327 sdata->vif.bss_conf.beacon_int = beacon_int; 328 sdata->vif.bss_conf.basic_rates = basic_rates; 329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 331 bss_change = BSS_CHANGED_BEACON_INT; 332 bss_change |= ieee80211_reset_erp_info(sdata); 333 bss_change |= BSS_CHANGED_BSSID; 334 bss_change |= BSS_CHANGED_BEACON; 335 bss_change |= BSS_CHANGED_BEACON_ENABLED; 336 bss_change |= BSS_CHANGED_BASIC_RATES; 337 bss_change |= BSS_CHANGED_HT; 338 bss_change |= BSS_CHANGED_IBSS; 339 bss_change |= BSS_CHANGED_SSID; 340 341 /* 342 * In 5 GHz/802.11a, we can always use short slot time. 343 * (IEEE 802.11-2012 18.3.8.7) 344 * 345 * In 2.4GHz, we must always use long slots in IBSS for compatibility 346 * reasons. 347 * (IEEE 802.11-2012 19.4.5) 348 * 349 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 350 */ 351 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395} 396 397static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 398 struct ieee80211_bss *bss) 399{ 400 struct cfg80211_bss *cbss = 401 container_of((void *)bss, struct cfg80211_bss, priv); 402 struct ieee80211_supported_band *sband; 403 struct cfg80211_chan_def chandef; 404 u32 basic_rates; 405 int i, j; 406 u16 beacon_int = cbss->beacon_interval; 407 const struct cfg80211_bss_ies *ies; 408 enum nl80211_channel_type chan_type; 409 u64 tsf; 410 u32 rate_flags; 411 int shift; 412 413 sdata_assert_lock(sdata); 414 415 if (beacon_int < 10) 416 beacon_int = 10; 417 418 switch (sdata->u.ibss.chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 case NL80211_CHAN_WIDTH_40: 422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 424 break; 425 case NL80211_CHAN_WIDTH_5: 426 case NL80211_CHAN_WIDTH_10: 427 cfg80211_chandef_create(&chandef, cbss->channel, 428 NL80211_CHAN_WIDTH_20_NOHT); 429 chandef.width = sdata->u.ibss.chandef.width; 430 break; 431 case NL80211_CHAN_WIDTH_80: 432 case NL80211_CHAN_WIDTH_160: 433 chandef = sdata->u.ibss.chandef; 434 chandef.chan = cbss->channel; 435 break; 436 default: 437 /* fall back to 20 MHz for unsupported modes */ 438 cfg80211_chandef_create(&chandef, cbss->channel, 439 NL80211_CHAN_WIDTH_20_NOHT); 440 break; 441 } 442 443 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 444 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 445 shift = ieee80211_vif_get_shift(&sdata->vif); 446 447 basic_rates = 0; 448 449 for (i = 0; i < bss->supp_rates_len; i++) { 450 int rate = bss->supp_rates[i] & 0x7f; 451 bool is_basic = !!(bss->supp_rates[i] & 0x80); 452 453 for (j = 0; j < sband->n_bitrates; j++) { 454 int brate; 455 if ((rate_flags & sband->bitrates[j].flags) 456 != rate_flags) 457 continue; 458 459 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 460 5 * (1 << shift)); 461 if (brate == rate) { 462 if (is_basic) 463 basic_rates |= BIT(j); 464 break; 465 } 466 } 467 } 468 469 rcu_read_lock(); 470 ies = rcu_dereference(cbss->ies); 471 tsf = ies->tsf; 472 rcu_read_unlock(); 473 474 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 475 beacon_int, 476 &chandef, 477 basic_rates, 478 cbss->capability, 479 tsf, false); 480} 481 482int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 483 struct cfg80211_csa_settings *csa_settings) 484{ 485 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 486 struct beacon_data *presp, *old_presp; 487 struct cfg80211_bss *cbss; 488 const struct cfg80211_bss_ies *ies; 489 u16 capability = 0; 490 u64 tsf; 491 int ret = 0; 492 493 sdata_assert_lock(sdata); 494 495 if (ifibss->privacy) 496 capability = WLAN_CAPABILITY_PRIVACY; 497 498 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 499 ifibss->bssid, ifibss->ssid, 500 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 501 IEEE80211_PRIVACY(ifibss->privacy)); 502 503 if (WARN_ON(!cbss)) { 504 ret = -EINVAL; 505 goto out; 506 } 507 508 rcu_read_lock(); 509 ies = rcu_dereference(cbss->ies); 510 tsf = ies->tsf; 511 rcu_read_unlock(); 512 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 513 514 old_presp = rcu_dereference_protected(ifibss->presp, 515 lockdep_is_held(&sdata->wdev.mtx)); 516 517 presp = ieee80211_ibss_build_presp(sdata, 518 sdata->vif.bss_conf.beacon_int, 519 sdata->vif.bss_conf.basic_rates, 520 capability, tsf, &ifibss->chandef, 521 NULL, csa_settings); 522 if (!presp) { 523 ret = -ENOMEM; 524 goto out; 525 } 526 527 rcu_assign_pointer(ifibss->presp, presp); 528 if (old_presp) 529 kfree_rcu(old_presp, rcu_head); 530 531 return BSS_CHANGED_BEACON; 532 out: 533 return ret; 534} 535 536int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 537{ 538 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 539 struct cfg80211_bss *cbss; 540 int err, changed = 0; 541 542 sdata_assert_lock(sdata); 543 544 /* update cfg80211 bss information with the new channel */ 545 if (!is_zero_ether_addr(ifibss->bssid)) { 546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 547 ifibss->chandef.chan, 548 ifibss->bssid, ifibss->ssid, 549 ifibss->ssid_len, 550 IEEE80211_BSS_TYPE_IBSS, 551 IEEE80211_PRIVACY(ifibss->privacy)); 552 /* XXX: should not really modify cfg80211 data */ 553 if (cbss) { 554 cbss->channel = sdata->csa_chandef.chan; 555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 556 } 557 } 558 559 ifibss->chandef = sdata->csa_chandef; 560 561 /* generate the beacon */ 562 err = ieee80211_ibss_csa_beacon(sdata, NULL); 563 if (err < 0) 564 return err; 565 566 changed |= err; 567 568 return changed; 569} 570 571void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 572{ 573 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 574 575 cancel_work_sync(&ifibss->csa_connection_drop_work); 576} 577 578static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 579 __acquires(RCU) 580{ 581 struct ieee80211_sub_if_data *sdata = sta->sdata; 582 u8 addr[ETH_ALEN]; 583 584 memcpy(addr, sta->sta.addr, ETH_ALEN); 585 586 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 587 588 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 589 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 590 /* authorize the station only if the network is not RSN protected. If 591 * not wait for the userspace to authorize it */ 592 if (!sta->sdata->u.ibss.control_port) 593 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 594 595 rate_control_rate_init(sta); 596 597 /* If it fails, maybe we raced another insertion? */ 598 if (sta_info_insert_rcu(sta)) 599 return sta_info_get(sdata, addr); 600 return sta; 601} 602 603static struct sta_info * 604ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 605 const u8 *addr, u32 supp_rates) 606 __acquires(RCU) 607{ 608 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 609 struct ieee80211_local *local = sdata->local; 610 struct sta_info *sta; 611 struct ieee80211_chanctx_conf *chanctx_conf; 612 struct ieee80211_supported_band *sband; 613 enum nl80211_bss_scan_width scan_width; 614 int band; 615 616 /* 617 * XXX: Consider removing the least recently used entry and 618 * allow new one to be added. 619 */ 620 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 621 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 622 sdata->name, addr); 623 rcu_read_lock(); 624 return NULL; 625 } 626 627 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 628 rcu_read_lock(); 629 return NULL; 630 } 631 632 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 633 rcu_read_lock(); 634 return NULL; 635 } 636 637 rcu_read_lock(); 638 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 639 if (WARN_ON_ONCE(!chanctx_conf)) 640 return NULL; 641 band = chanctx_conf->def.chan->band; 642 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 643 rcu_read_unlock(); 644 645 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 646 if (!sta) { 647 rcu_read_lock(); 648 return NULL; 649 } 650 651 sta->rx_stats.last_rx = jiffies; 652 653 /* make sure mandatory rates are always added */ 654 sband = local->hw.wiphy->bands[band]; 655 sta->sta.supp_rates[band] = supp_rates | 656 ieee80211_mandatory_rates(sband, scan_width); 657 658 return ieee80211_ibss_finish_sta(sta); 659} 660 661static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 662{ 663 struct ieee80211_local *local = sdata->local; 664 int active = 0; 665 struct sta_info *sta; 666 667 sdata_assert_lock(sdata); 668 669 rcu_read_lock(); 670 671 list_for_each_entry_rcu(sta, &local->sta_list, list) { 672 if (sta->sdata == sdata && 673 time_after(sta->rx_stats.last_rx + 674 IEEE80211_IBSS_MERGE_INTERVAL, 675 jiffies)) { 676 active++; 677 break; 678 } 679 } 680 681 rcu_read_unlock(); 682 683 return active; 684} 685 686static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 687{ 688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 689 struct ieee80211_local *local = sdata->local; 690 struct cfg80211_bss *cbss; 691 struct beacon_data *presp; 692 struct sta_info *sta; 693 694 if (!is_zero_ether_addr(ifibss->bssid)) { 695 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 696 ifibss->bssid, ifibss->ssid, 697 ifibss->ssid_len, 698 IEEE80211_BSS_TYPE_IBSS, 699 IEEE80211_PRIVACY(ifibss->privacy)); 700 701 if (cbss) { 702 cfg80211_unlink_bss(local->hw.wiphy, cbss); 703 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 704 } 705 } 706 707 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 708 709 sta_info_flush(sdata); 710 711 spin_lock_bh(&ifibss->incomplete_lock); 712 while (!list_empty(&ifibss->incomplete_stations)) { 713 sta = list_first_entry(&ifibss->incomplete_stations, 714 struct sta_info, list); 715 list_del(&sta->list); 716 spin_unlock_bh(&ifibss->incomplete_lock); 717 718 sta_info_free(local, sta); 719 spin_lock_bh(&ifibss->incomplete_lock); 720 } 721 spin_unlock_bh(&ifibss->incomplete_lock); 722 723 netif_carrier_off(sdata->dev); 724 725 sdata->vif.bss_conf.ibss_joined = false; 726 sdata->vif.bss_conf.ibss_creator = false; 727 sdata->vif.bss_conf.enable_beacon = false; 728 sdata->vif.bss_conf.ssid_len = 0; 729 730 /* remove beacon */ 731 presp = rcu_dereference_protected(ifibss->presp, 732 lockdep_is_held(&sdata->wdev.mtx)); 733 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 734 if (presp) 735 kfree_rcu(presp, rcu_head); 736 737 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 739 BSS_CHANGED_IBSS); 740 drv_leave_ibss(local, sdata); 741 mutex_lock(&local->mtx); 742 ieee80211_vif_release_channel(sdata); 743 mutex_unlock(&local->mtx); 744} 745 746static void ieee80211_csa_connection_drop_work(struct work_struct *work) 747{ 748 struct ieee80211_sub_if_data *sdata = 749 container_of(work, struct ieee80211_sub_if_data, 750 u.ibss.csa_connection_drop_work); 751 752 sdata_lock(sdata); 753 754 ieee80211_ibss_disconnect(sdata); 755 synchronize_rcu(); 756 skb_queue_purge(&sdata->skb_queue); 757 758 /* trigger a scan to find another IBSS network to join */ 759 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 760 761 sdata_unlock(sdata); 762} 763 764static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 765{ 766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 767 int err; 768 769 /* if the current channel is a DFS channel, mark the channel as 770 * unavailable. 771 */ 772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 773 &ifibss->chandef, 774 NL80211_IFTYPE_ADHOC); 775 if (err > 0) 776 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 777 GFP_ATOMIC); 778} 779 780static bool 781ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 782 struct ieee802_11_elems *elems, 783 bool beacon) 784{ 785 struct cfg80211_csa_settings params; 786 struct ieee80211_csa_ie csa_ie; 787 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 788 enum nl80211_channel_type ch_type; 789 int err; 790 u32 sta_flags; 791 792 sdata_assert_lock(sdata); 793 794 sta_flags = IEEE80211_STA_DISABLE_VHT; 795 switch (ifibss->chandef.width) { 796 case NL80211_CHAN_WIDTH_5: 797 case NL80211_CHAN_WIDTH_10: 798 case NL80211_CHAN_WIDTH_20_NOHT: 799 sta_flags |= IEEE80211_STA_DISABLE_HT; 800 /* fall through */ 801 case NL80211_CHAN_WIDTH_20: 802 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 803 break; 804 default: 805 break; 806 } 807 808 memset(¶ms, 0, sizeof(params)); 809 memset(&csa_ie, 0, sizeof(csa_ie)); 810 err = ieee80211_parse_ch_switch_ie(sdata, elems, 811 ifibss->chandef.chan->band, 812 sta_flags, ifibss->bssid, &csa_ie); 813 /* can't switch to destination channel, fail */ 814 if (err < 0) 815 goto disconnect; 816 817 /* did not contain a CSA */ 818 if (err) 819 return false; 820 821 /* channel switch is not supported, disconnect */ 822 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 823 goto disconnect; 824 825 params.count = csa_ie.count; 826 params.chandef = csa_ie.chandef; 827 828 switch (ifibss->chandef.width) { 829 case NL80211_CHAN_WIDTH_20_NOHT: 830 case NL80211_CHAN_WIDTH_20: 831 case NL80211_CHAN_WIDTH_40: 832 /* keep our current HT mode (HT20/HT40+/HT40-), even if 833 * another mode has been announced. The mode is not adopted 834 * within the beacon while doing CSA and we should therefore 835 * keep the mode which we announce. 836 */ 837 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 838 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 839 ch_type); 840 break; 841 case NL80211_CHAN_WIDTH_5: 842 case NL80211_CHAN_WIDTH_10: 843 if (params.chandef.width != ifibss->chandef.width) { 844 sdata_info(sdata, 845 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 846 ifibss->bssid, 847 params.chandef.chan->center_freq, 848 params.chandef.width, 849 params.chandef.center_freq1, 850 params.chandef.center_freq2); 851 goto disconnect; 852 } 853 break; 854 default: 855 /* should not happen, sta_flags should prevent VHT modes. */ 856 WARN_ON(1); 857 goto disconnect; 858 } 859 860 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 861 NL80211_IFTYPE_ADHOC)) { 862 sdata_info(sdata, 863 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 864 ifibss->bssid, 865 params.chandef.chan->center_freq, 866 params.chandef.width, 867 params.chandef.center_freq1, 868 params.chandef.center_freq2); 869 goto disconnect; 870 } 871 872 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 873 ¶ms.chandef, 874 NL80211_IFTYPE_ADHOC); 875 if (err < 0) 876 goto disconnect; 877 if (err > 0 && !ifibss->userspace_handles_dfs) { 878 /* IBSS-DFS only allowed with a control program */ 879 goto disconnect; 880 } 881 882 params.radar_required = err; 883 884 if (cfg80211_chandef_identical(¶ms.chandef, 885 &sdata->vif.bss_conf.chandef)) { 886 ibss_dbg(sdata, 887 "received csa with an identical chandef, ignoring\n"); 888 return true; 889 } 890 891 /* all checks done, now perform the channel switch. */ 892 ibss_dbg(sdata, 893 "received channel switch announcement to go to channel %d MHz\n", 894 params.chandef.chan->center_freq); 895 896 params.block_tx = !!csa_ie.mode; 897 898 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 899 ¶ms)) 900 goto disconnect; 901 902 ieee80211_ibss_csa_mark_radar(sdata); 903 904 return true; 905disconnect: 906 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 907 ieee80211_queue_work(&sdata->local->hw, 908 &ifibss->csa_connection_drop_work); 909 910 ieee80211_ibss_csa_mark_radar(sdata); 911 912 return true; 913} 914 915static void 916ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 917 struct ieee80211_mgmt *mgmt, size_t len, 918 struct ieee80211_rx_status *rx_status, 919 struct ieee802_11_elems *elems) 920{ 921 int required_len; 922 923 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 924 return; 925 926 /* CSA is the only action we handle for now */ 927 if (mgmt->u.action.u.measurement.action_code != 928 WLAN_ACTION_SPCT_CHL_SWITCH) 929 return; 930 931 required_len = IEEE80211_MIN_ACTION_SIZE + 932 sizeof(mgmt->u.action.u.chan_switch); 933 if (len < required_len) 934 return; 935 936 if (!sdata->vif.csa_active) 937 ieee80211_ibss_process_chanswitch(sdata, elems, false); 938} 939 940static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 941 struct ieee80211_mgmt *mgmt, 942 size_t len) 943{ 944 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 945 946 if (len < IEEE80211_DEAUTH_FRAME_LEN) 947 return; 948 949 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 950 mgmt->sa, mgmt->da, mgmt->bssid, reason); 951 sta_info_destroy_addr(sdata, mgmt->sa); 952} 953 954static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 955 struct ieee80211_mgmt *mgmt, 956 size_t len) 957{ 958 u16 auth_alg, auth_transaction; 959 960 sdata_assert_lock(sdata); 961 962 if (len < 24 + 6) 963 return; 964 965 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 966 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 967 968 ibss_dbg(sdata, 969 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 970 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 971 972 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 973 return; 974 975 /* 976 * IEEE 802.11 standard does not require authentication in IBSS 977 * networks and most implementations do not seem to use it. 978 * However, try to reply to authentication attempts if someone 979 * has actually implemented this. 980 */ 981 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 982 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 983} 984 985static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 986 struct ieee80211_mgmt *mgmt, size_t len, 987 struct ieee80211_rx_status *rx_status, 988 struct ieee802_11_elems *elems, 989 struct ieee80211_channel *channel) 990{ 991 struct sta_info *sta; 992 enum ieee80211_band band = rx_status->band; 993 enum nl80211_bss_scan_width scan_width; 994 struct ieee80211_local *local = sdata->local; 995 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 996 bool rates_updated = false; 997 u32 supp_rates = 0; 998 999 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1000 return; 1001 1002 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1003 return; 1004 1005 rcu_read_lock(); 1006 sta = sta_info_get(sdata, mgmt->sa); 1007 1008 if (elems->supp_rates) { 1009 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1010 band, NULL); 1011 if (sta) { 1012 u32 prev_rates; 1013 1014 prev_rates = sta->sta.supp_rates[band]; 1015 /* make sure mandatory rates are always added */ 1016 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1017 if (rx_status->flag & RX_FLAG_5MHZ) 1018 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1019 if (rx_status->flag & RX_FLAG_10MHZ) 1020 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1021 1022 sta->sta.supp_rates[band] = supp_rates | 1023 ieee80211_mandatory_rates(sband, scan_width); 1024 if (sta->sta.supp_rates[band] != prev_rates) { 1025 ibss_dbg(sdata, 1026 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1027 sta->sta.addr, prev_rates, 1028 sta->sta.supp_rates[band]); 1029 rates_updated = true; 1030 } 1031 } else { 1032 rcu_read_unlock(); 1033 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1034 mgmt->sa, supp_rates); 1035 } 1036 } 1037 1038 if (sta && !sta->sta.wme && 1039 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { 1040 sta->sta.wme = true; 1041 ieee80211_check_fast_xmit(sta); 1042 } 1043 1044 if (sta && elems->ht_operation && elems->ht_cap_elem && 1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1048 /* we both use HT */ 1049 struct ieee80211_ht_cap htcap_ie; 1050 struct cfg80211_chan_def chandef; 1051 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1052 1053 ieee80211_ht_oper_to_chandef(channel, 1054 elems->ht_operation, 1055 &chandef); 1056 1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1059 &htcap_ie, 1060 sta); 1061 1062 if (elems->vht_operation && elems->vht_cap_elem && 1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1065 /* we both use VHT */ 1066 struct ieee80211_vht_cap cap_ie; 1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1068 1069 ieee80211_vht_oper_to_chandef(channel, 1070 elems->vht_operation, 1071 &chandef); 1072 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1073 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1074 &cap_ie, sta); 1075 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1076 rates_updated |= true; 1077 } 1078 1079 if (bw != sta->sta.bandwidth) 1080 rates_updated |= true; 1081 1082 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1083 &chandef)) 1084 WARN_ON_ONCE(1); 1085 } 1086 1087 if (sta && rates_updated) { 1088 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1089 u8 rx_nss = sta->sta.rx_nss; 1090 1091 /* Force rx_nss recalculation */ 1092 sta->sta.rx_nss = 0; 1093 rate_control_rate_init(sta); 1094 if (sta->sta.rx_nss != rx_nss) 1095 changed |= IEEE80211_RC_NSS_CHANGED; 1096 1097 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1098 } 1099 1100 rcu_read_unlock(); 1101} 1102 1103static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1104 struct ieee80211_mgmt *mgmt, size_t len, 1105 struct ieee80211_rx_status *rx_status, 1106 struct ieee802_11_elems *elems) 1107{ 1108 struct ieee80211_local *local = sdata->local; 1109 struct cfg80211_bss *cbss; 1110 struct ieee80211_bss *bss; 1111 struct ieee80211_channel *channel; 1112 u64 beacon_timestamp, rx_timestamp; 1113 u32 supp_rates = 0; 1114 enum ieee80211_band band = rx_status->band; 1115 1116 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1117 if (!channel) 1118 return; 1119 1120 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1121 1122 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1123 channel); 1124 if (!bss) 1125 return; 1126 1127 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1128 1129 /* same for beacon and probe response */ 1130 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1131 1132 /* check if we need to merge IBSS */ 1133 1134 /* not an IBSS */ 1135 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1136 goto put_bss; 1137 1138 /* different channel */ 1139 if (sdata->u.ibss.fixed_channel && 1140 sdata->u.ibss.chandef.chan != cbss->channel) 1141 goto put_bss; 1142 1143 /* different SSID */ 1144 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1145 memcmp(elems->ssid, sdata->u.ibss.ssid, 1146 sdata->u.ibss.ssid_len)) 1147 goto put_bss; 1148 1149 /* process channel switch */ 1150 if (sdata->vif.csa_active || 1151 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1152 goto put_bss; 1153 1154 /* same BSSID */ 1155 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1156 goto put_bss; 1157 1158 /* we use a fixed BSSID */ 1159 if (sdata->u.ibss.fixed_bssid) 1160 goto put_bss; 1161 1162 if (ieee80211_have_rx_timestamp(rx_status)) { 1163 /* time when timestamp field was received */ 1164 rx_timestamp = 1165 ieee80211_calculate_rx_timestamp(local, rx_status, 1166 len + FCS_LEN, 24); 1167 } else { 1168 /* 1169 * second best option: get current TSF 1170 * (will return -1 if not supported) 1171 */ 1172 rx_timestamp = drv_get_tsf(local, sdata); 1173 } 1174 1175 ibss_dbg(sdata, 1176 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1177 mgmt->sa, mgmt->bssid, 1178 (unsigned long long)rx_timestamp, 1179 (unsigned long long)beacon_timestamp, 1180 (unsigned long long)(rx_timestamp - beacon_timestamp), 1181 jiffies); 1182 1183 if (beacon_timestamp > rx_timestamp) { 1184 ibss_dbg(sdata, 1185 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1186 mgmt->bssid); 1187 ieee80211_sta_join_ibss(sdata, bss); 1188 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1189 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1190 supp_rates); 1191 rcu_read_unlock(); 1192 } 1193 1194 put_bss: 1195 ieee80211_rx_bss_put(local, bss); 1196} 1197 1198void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1199 const u8 *bssid, const u8 *addr, 1200 u32 supp_rates) 1201{ 1202 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1203 struct ieee80211_local *local = sdata->local; 1204 struct sta_info *sta; 1205 struct ieee80211_chanctx_conf *chanctx_conf; 1206 struct ieee80211_supported_band *sband; 1207 enum nl80211_bss_scan_width scan_width; 1208 int band; 1209 1210 /* 1211 * XXX: Consider removing the least recently used entry and 1212 * allow new one to be added. 1213 */ 1214 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1215 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1216 sdata->name, addr); 1217 return; 1218 } 1219 1220 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1221 return; 1222 1223 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1224 return; 1225 1226 rcu_read_lock(); 1227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1228 if (WARN_ON_ONCE(!chanctx_conf)) { 1229 rcu_read_unlock(); 1230 return; 1231 } 1232 band = chanctx_conf->def.chan->band; 1233 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1234 rcu_read_unlock(); 1235 1236 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1237 if (!sta) 1238 return; 1239 1240 sta->rx_stats.last_rx = jiffies; 1241 1242 /* make sure mandatory rates are always added */ 1243 sband = local->hw.wiphy->bands[band]; 1244 sta->sta.supp_rates[band] = supp_rates | 1245 ieee80211_mandatory_rates(sband, scan_width); 1246 1247 spin_lock(&ifibss->incomplete_lock); 1248 list_add(&sta->list, &ifibss->incomplete_stations); 1249 spin_unlock(&ifibss->incomplete_lock); 1250 ieee80211_queue_work(&local->hw, &sdata->work); 1251} 1252 1253static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1254{ 1255 struct ieee80211_local *local = sdata->local; 1256 struct sta_info *sta, *tmp; 1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1259 1260 mutex_lock(&local->sta_mtx); 1261 1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1263 if (sdata != sta->sdata) 1264 continue; 1265 1266 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) || 1267 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) && 1268 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1269 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1270 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1271 "not authorized " : "", sta->sta.addr); 1272 1273 WARN_ON(__sta_info_destroy(sta)); 1274 } 1275 } 1276 1277 mutex_unlock(&local->sta_mtx); 1278} 1279 1280/* 1281 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1282 */ 1283 1284static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1285{ 1286 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1287 enum nl80211_bss_scan_width scan_width; 1288 1289 sdata_assert_lock(sdata); 1290 1291 mod_timer(&ifibss->timer, 1292 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1293 1294 ieee80211_ibss_sta_expire(sdata); 1295 1296 if (time_before(jiffies, ifibss->last_scan_completed + 1297 IEEE80211_IBSS_MERGE_INTERVAL)) 1298 return; 1299 1300 if (ieee80211_sta_active_ibss(sdata)) 1301 return; 1302 1303 if (ifibss->fixed_channel) 1304 return; 1305 1306 sdata_info(sdata, 1307 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1308 1309 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1310 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1311 NULL, 0, scan_width); 1312} 1313 1314static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1315{ 1316 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1317 u8 bssid[ETH_ALEN]; 1318 u16 capability; 1319 int i; 1320 1321 sdata_assert_lock(sdata); 1322 1323 if (ifibss->fixed_bssid) { 1324 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1325 } else { 1326 /* Generate random, not broadcast, locally administered BSSID. Mix in 1327 * own MAC address to make sure that devices that do not have proper 1328 * random number generator get different BSSID. */ 1329 get_random_bytes(bssid, ETH_ALEN); 1330 for (i = 0; i < ETH_ALEN; i++) 1331 bssid[i] ^= sdata->vif.addr[i]; 1332 bssid[0] &= ~0x01; 1333 bssid[0] |= 0x02; 1334 } 1335 1336 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1337 1338 capability = WLAN_CAPABILITY_IBSS; 1339 1340 if (ifibss->privacy) 1341 capability |= WLAN_CAPABILITY_PRIVACY; 1342 1343 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1344 &ifibss->chandef, ifibss->basic_rates, 1345 capability, 0, true); 1346} 1347 1348static unsigned ibss_setup_channels(struct wiphy *wiphy, 1349 struct ieee80211_channel **channels, 1350 unsigned int channels_max, 1351 u32 center_freq, u32 width) 1352{ 1353 struct ieee80211_channel *chan = NULL; 1354 unsigned int n_chan = 0; 1355 u32 start_freq, end_freq, freq; 1356 1357 if (width <= 20) { 1358 start_freq = center_freq; 1359 end_freq = center_freq; 1360 } else { 1361 start_freq = center_freq - width / 2 + 10; 1362 end_freq = center_freq + width / 2 - 10; 1363 } 1364 1365 for (freq = start_freq; freq <= end_freq; freq += 20) { 1366 chan = ieee80211_get_channel(wiphy, freq); 1367 if (!chan) 1368 continue; 1369 if (n_chan >= channels_max) 1370 return n_chan; 1371 1372 channels[n_chan] = chan; 1373 n_chan++; 1374 } 1375 1376 return n_chan; 1377} 1378 1379static unsigned int 1380ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1381 const struct cfg80211_chan_def *chandef, 1382 struct ieee80211_channel **channels, 1383 unsigned int channels_max) 1384{ 1385 unsigned int n_chan = 0; 1386 u32 width, cf1, cf2 = 0; 1387 1388 switch (chandef->width) { 1389 case NL80211_CHAN_WIDTH_40: 1390 width = 40; 1391 break; 1392 case NL80211_CHAN_WIDTH_80P80: 1393 cf2 = chandef->center_freq2; 1394 /* fall through */ 1395 case NL80211_CHAN_WIDTH_80: 1396 width = 80; 1397 break; 1398 case NL80211_CHAN_WIDTH_160: 1399 width = 160; 1400 break; 1401 default: 1402 width = 20; 1403 break; 1404 } 1405 1406 cf1 = chandef->center_freq1; 1407 1408 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1409 1410 if (cf2) 1411 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1412 channels_max - n_chan, cf2, 1413 width); 1414 1415 return n_chan; 1416} 1417 1418/* 1419 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1420 */ 1421 1422static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1423{ 1424 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1425 struct ieee80211_local *local = sdata->local; 1426 struct cfg80211_bss *cbss; 1427 struct ieee80211_channel *chan = NULL; 1428 const u8 *bssid = NULL; 1429 enum nl80211_bss_scan_width scan_width; 1430 int active_ibss; 1431 1432 sdata_assert_lock(sdata); 1433 1434 active_ibss = ieee80211_sta_active_ibss(sdata); 1435 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1436 1437 if (active_ibss) 1438 return; 1439 1440 if (ifibss->fixed_bssid) 1441 bssid = ifibss->bssid; 1442 if (ifibss->fixed_channel) 1443 chan = ifibss->chandef.chan; 1444 if (!is_zero_ether_addr(ifibss->bssid)) 1445 bssid = ifibss->bssid; 1446 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1447 ifibss->ssid, ifibss->ssid_len, 1448 IEEE80211_BSS_TYPE_IBSS, 1449 IEEE80211_PRIVACY(ifibss->privacy)); 1450 1451 if (cbss) { 1452 struct ieee80211_bss *bss; 1453 1454 bss = (void *)cbss->priv; 1455 ibss_dbg(sdata, 1456 "sta_find_ibss: selected %pM current %pM\n", 1457 cbss->bssid, ifibss->bssid); 1458 sdata_info(sdata, 1459 "Selected IBSS BSSID %pM based on configured SSID\n", 1460 cbss->bssid); 1461 1462 ieee80211_sta_join_ibss(sdata, bss); 1463 ieee80211_rx_bss_put(local, bss); 1464 return; 1465 } 1466 1467 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1468 * directly and do not waste time scanning 1469 */ 1470 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1471 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1472 bssid); 1473 ieee80211_sta_create_ibss(sdata); 1474 return; 1475 } 1476 1477 1478 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1479 1480 /* Selected IBSS not found in current scan results - try to scan */ 1481 if (time_after(jiffies, ifibss->last_scan_completed + 1482 IEEE80211_SCAN_INTERVAL)) { 1483 struct ieee80211_channel *channels[8]; 1484 unsigned int num; 1485 1486 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1487 1488 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1489 1490 if (ifibss->fixed_channel) { 1491 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1492 &ifibss->chandef, 1493 channels, 1494 ARRAY_SIZE(channels)); 1495 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1496 ifibss->ssid_len, channels, 1497 num, scan_width); 1498 } else { 1499 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1500 ifibss->ssid_len, NULL, 1501 0, scan_width); 1502 } 1503 } else { 1504 int interval = IEEE80211_SCAN_INTERVAL; 1505 1506 if (time_after(jiffies, ifibss->ibss_join_req + 1507 IEEE80211_IBSS_JOIN_TIMEOUT)) 1508 ieee80211_sta_create_ibss(sdata); 1509 1510 mod_timer(&ifibss->timer, 1511 round_jiffies(jiffies + interval)); 1512 } 1513} 1514 1515static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1516 struct sk_buff *req) 1517{ 1518 struct ieee80211_mgmt *mgmt = (void *)req->data; 1519 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1520 struct ieee80211_local *local = sdata->local; 1521 int tx_last_beacon, len = req->len; 1522 struct sk_buff *skb; 1523 struct beacon_data *presp; 1524 u8 *pos, *end; 1525 1526 sdata_assert_lock(sdata); 1527 1528 presp = rcu_dereference_protected(ifibss->presp, 1529 lockdep_is_held(&sdata->wdev.mtx)); 1530 1531 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1532 len < 24 + 2 || !presp) 1533 return; 1534 1535 tx_last_beacon = drv_tx_last_beacon(local); 1536 1537 ibss_dbg(sdata, 1538 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1539 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1540 1541 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1542 return; 1543 1544 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1545 !is_broadcast_ether_addr(mgmt->bssid)) 1546 return; 1547 1548 end = ((u8 *) mgmt) + len; 1549 pos = mgmt->u.probe_req.variable; 1550 if (pos[0] != WLAN_EID_SSID || 1551 pos + 2 + pos[1] > end) { 1552 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1553 mgmt->sa); 1554 return; 1555 } 1556 if (pos[1] != 0 && 1557 (pos[1] != ifibss->ssid_len || 1558 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1559 /* Ignore ProbeReq for foreign SSID */ 1560 return; 1561 } 1562 1563 /* Reply with ProbeResp */ 1564 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1565 if (!skb) 1566 return; 1567 1568 skb_reserve(skb, local->tx_headroom); 1569 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1570 1571 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1572 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1573 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1574 1575 /* avoid excessive retries for probe request to wildcard SSIDs */ 1576 if (pos[1] == 0) 1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1578 1579 ieee80211_tx_skb(sdata, skb); 1580} 1581 1582static 1583void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1584 struct ieee80211_mgmt *mgmt, size_t len, 1585 struct ieee80211_rx_status *rx_status) 1586{ 1587 size_t baselen; 1588 struct ieee802_11_elems elems; 1589 1590 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1591 offsetof(typeof(mgmt->u.beacon), variable)); 1592 1593 /* 1594 * either beacon or probe_resp but the variable field is at the 1595 * same offset 1596 */ 1597 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1598 if (baselen > len) 1599 return; 1600 1601 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1602 false, &elems); 1603 1604 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1605} 1606 1607void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1608 struct sk_buff *skb) 1609{ 1610 struct ieee80211_rx_status *rx_status; 1611 struct ieee80211_mgmt *mgmt; 1612 u16 fc; 1613 struct ieee802_11_elems elems; 1614 int ies_len; 1615 1616 rx_status = IEEE80211_SKB_RXCB(skb); 1617 mgmt = (struct ieee80211_mgmt *) skb->data; 1618 fc = le16_to_cpu(mgmt->frame_control); 1619 1620 sdata_lock(sdata); 1621 1622 if (!sdata->u.ibss.ssid_len) 1623 goto mgmt_out; /* not ready to merge yet */ 1624 1625 switch (fc & IEEE80211_FCTL_STYPE) { 1626 case IEEE80211_STYPE_PROBE_REQ: 1627 ieee80211_rx_mgmt_probe_req(sdata, skb); 1628 break; 1629 case IEEE80211_STYPE_PROBE_RESP: 1630 case IEEE80211_STYPE_BEACON: 1631 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1632 rx_status); 1633 break; 1634 case IEEE80211_STYPE_AUTH: 1635 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1636 break; 1637 case IEEE80211_STYPE_DEAUTH: 1638 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1639 break; 1640 case IEEE80211_STYPE_ACTION: 1641 switch (mgmt->u.action.category) { 1642 case WLAN_CATEGORY_SPECTRUM_MGMT: 1643 ies_len = skb->len - 1644 offsetof(struct ieee80211_mgmt, 1645 u.action.u.chan_switch.variable); 1646 1647 if (ies_len < 0) 1648 break; 1649 1650 ieee802_11_parse_elems( 1651 mgmt->u.action.u.chan_switch.variable, 1652 ies_len, true, &elems); 1653 1654 if (elems.parse_error) 1655 break; 1656 1657 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1658 rx_status, &elems); 1659 break; 1660 } 1661 } 1662 1663 mgmt_out: 1664 sdata_unlock(sdata); 1665} 1666 1667void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1668{ 1669 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1670 struct sta_info *sta; 1671 1672 sdata_lock(sdata); 1673 1674 /* 1675 * Work could be scheduled after scan or similar 1676 * when we aren't even joined (or trying) with a 1677 * network. 1678 */ 1679 if (!ifibss->ssid_len) 1680 goto out; 1681 1682 spin_lock_bh(&ifibss->incomplete_lock); 1683 while (!list_empty(&ifibss->incomplete_stations)) { 1684 sta = list_first_entry(&ifibss->incomplete_stations, 1685 struct sta_info, list); 1686 list_del(&sta->list); 1687 spin_unlock_bh(&ifibss->incomplete_lock); 1688 1689 ieee80211_ibss_finish_sta(sta); 1690 rcu_read_unlock(); 1691 spin_lock_bh(&ifibss->incomplete_lock); 1692 } 1693 spin_unlock_bh(&ifibss->incomplete_lock); 1694 1695 switch (ifibss->state) { 1696 case IEEE80211_IBSS_MLME_SEARCH: 1697 ieee80211_sta_find_ibss(sdata); 1698 break; 1699 case IEEE80211_IBSS_MLME_JOINED: 1700 ieee80211_sta_merge_ibss(sdata); 1701 break; 1702 default: 1703 WARN_ON(1); 1704 break; 1705 } 1706 1707 out: 1708 sdata_unlock(sdata); 1709} 1710 1711static void ieee80211_ibss_timer(unsigned long data) 1712{ 1713 struct ieee80211_sub_if_data *sdata = 1714 (struct ieee80211_sub_if_data *) data; 1715 1716 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1717} 1718 1719void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1720{ 1721 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1722 1723 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1724 (unsigned long) sdata); 1725 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1726 spin_lock_init(&ifibss->incomplete_lock); 1727 INIT_WORK(&ifibss->csa_connection_drop_work, 1728 ieee80211_csa_connection_drop_work); 1729} 1730 1731/* scan finished notification */ 1732void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1733{ 1734 struct ieee80211_sub_if_data *sdata; 1735 1736 mutex_lock(&local->iflist_mtx); 1737 list_for_each_entry(sdata, &local->interfaces, list) { 1738 if (!ieee80211_sdata_running(sdata)) 1739 continue; 1740 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1741 continue; 1742 sdata->u.ibss.last_scan_completed = jiffies; 1743 } 1744 mutex_unlock(&local->iflist_mtx); 1745} 1746 1747int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1748 struct cfg80211_ibss_params *params) 1749{ 1750 u32 changed = 0; 1751 u32 rate_flags; 1752 struct ieee80211_supported_band *sband; 1753 enum ieee80211_chanctx_mode chanmode; 1754 struct ieee80211_local *local = sdata->local; 1755 int radar_detect_width = 0; 1756 int i; 1757 int ret; 1758 1759 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1760 ¶ms->chandef, 1761 sdata->wdev.iftype); 1762 if (ret < 0) 1763 return ret; 1764 1765 if (ret > 0) { 1766 if (!params->userspace_handles_dfs) 1767 return -EINVAL; 1768 radar_detect_width = BIT(params->chandef.width); 1769 } 1770 1771 chanmode = (params->channel_fixed && !ret) ? 1772 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1773 1774 mutex_lock(&local->chanctx_mtx); 1775 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1776 radar_detect_width); 1777 mutex_unlock(&local->chanctx_mtx); 1778 if (ret < 0) 1779 return ret; 1780 1781 if (params->bssid) { 1782 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1783 sdata->u.ibss.fixed_bssid = true; 1784 } else 1785 sdata->u.ibss.fixed_bssid = false; 1786 1787 sdata->u.ibss.privacy = params->privacy; 1788 sdata->u.ibss.control_port = params->control_port; 1789 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1790 sdata->u.ibss.basic_rates = params->basic_rates; 1791 sdata->u.ibss.last_scan_completed = jiffies; 1792 1793 /* fix basic_rates if channel does not support these rates */ 1794 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1795 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1796 for (i = 0; i < sband->n_bitrates; i++) { 1797 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1798 sdata->u.ibss.basic_rates &= ~BIT(i); 1799 } 1800 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1801 sizeof(params->mcast_rate)); 1802 1803 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1804 1805 sdata->u.ibss.chandef = params->chandef; 1806 sdata->u.ibss.fixed_channel = params->channel_fixed; 1807 1808 if (params->ie) { 1809 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1810 GFP_KERNEL); 1811 if (sdata->u.ibss.ie) 1812 sdata->u.ibss.ie_len = params->ie_len; 1813 } 1814 1815 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1816 sdata->u.ibss.ibss_join_req = jiffies; 1817 1818 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1819 sdata->u.ibss.ssid_len = params->ssid_len; 1820 1821 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1822 sizeof(sdata->u.ibss.ht_capa)); 1823 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1824 sizeof(sdata->u.ibss.ht_capa_mask)); 1825 1826 /* 1827 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1828 * reserved, but an HT STA shall protect HT transmissions as though 1829 * the HT Protection field were set to non-HT mixed mode. 1830 * 1831 * In an IBSS, the RIFS Mode field of the HT Operation element is 1832 * also reserved, but an HT STA shall operate as though this field 1833 * were set to 1. 1834 */ 1835 1836 sdata->vif.bss_conf.ht_operation_mode |= 1837 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1838 | IEEE80211_HT_PARAM_RIFS_MODE; 1839 1840 changed |= BSS_CHANGED_HT; 1841 ieee80211_bss_info_change_notify(sdata, changed); 1842 1843 sdata->smps_mode = IEEE80211_SMPS_OFF; 1844 sdata->needed_rx_chains = local->rx_chains; 1845 1846 ieee80211_queue_work(&local->hw, &sdata->work); 1847 1848 return 0; 1849} 1850 1851int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1852{ 1853 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1854 1855 ieee80211_ibss_disconnect(sdata); 1856 ifibss->ssid_len = 0; 1857 eth_zero_addr(ifibss->bssid); 1858 1859 /* remove beacon */ 1860 kfree(sdata->u.ibss.ie); 1861 1862 /* on the next join, re-program HT parameters */ 1863 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1864 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1865 1866 synchronize_rcu(); 1867 1868 skb_queue_purge(&sdata->skb_queue); 1869 1870 del_timer_sync(&sdata->u.ibss.timer); 1871 1872 return 0; 1873} 1874