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 38 static struct beacon_data * 39 ieee80211_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, false); 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; 212 error: 213 kfree(presp); 214 return NULL; 215 } 216 217 static 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 struct cfg80211_inform_bss bss_meta = {}; 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, false); 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 bss_meta.chan = chan; 387 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 388 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 389 presp->head_len, GFP_KERNEL); 390 391 cfg80211_put_bss(local->hw.wiphy, bss); 392 netif_carrier_on(sdata->dev); 393 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 394 } 395 396 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 397 struct ieee80211_bss *bss) 398 { 399 struct cfg80211_bss *cbss = 400 container_of((void *)bss, struct cfg80211_bss, priv); 401 struct ieee80211_supported_band *sband; 402 struct cfg80211_chan_def chandef; 403 u32 basic_rates; 404 int i, j; 405 u16 beacon_int = cbss->beacon_interval; 406 const struct cfg80211_bss_ies *ies; 407 enum nl80211_channel_type chan_type; 408 u64 tsf; 409 u32 rate_flags; 410 int shift; 411 412 sdata_assert_lock(sdata); 413 414 if (beacon_int < 10) 415 beacon_int = 10; 416 417 switch (sdata->u.ibss.chandef.width) { 418 case NL80211_CHAN_WIDTH_20_NOHT: 419 case NL80211_CHAN_WIDTH_20: 420 case NL80211_CHAN_WIDTH_40: 421 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 422 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 423 break; 424 case NL80211_CHAN_WIDTH_5: 425 case NL80211_CHAN_WIDTH_10: 426 cfg80211_chandef_create(&chandef, cbss->channel, 427 NL80211_CHAN_WIDTH_20_NOHT); 428 chandef.width = sdata->u.ibss.chandef.width; 429 break; 430 case NL80211_CHAN_WIDTH_80: 431 case NL80211_CHAN_WIDTH_80P80: 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 } 481 482 int 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 } 535 536 int 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 } 570 571 void 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 } 577 578 static 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 } 602 603 static struct sta_info * 604 ieee80211_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 } 660 661 static 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 } 685 686 static 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 } 745 746 static 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 } 763 764 static 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 } 779 780 static bool 781 ieee80211_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; 905 disconnect: 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 } 914 915 static void 916 ieee80211_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 } 939 940 static 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 } 953 954 static 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 } 984 985 static 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 1103 static 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 1198 void 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 1253 static 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 1284 static 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 1314 static 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 1348 static 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 1379 static unsigned int 1380 ieee80211_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 1422 static 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 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1489 &ifibss->chandef, 1490 channels, 1491 ARRAY_SIZE(channels)); 1492 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1493 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1494 ifibss->ssid_len, channels, num, 1495 scan_width); 1496 } else { 1497 int interval = IEEE80211_SCAN_INTERVAL; 1498 1499 if (time_after(jiffies, ifibss->ibss_join_req + 1500 IEEE80211_IBSS_JOIN_TIMEOUT)) 1501 ieee80211_sta_create_ibss(sdata); 1502 1503 mod_timer(&ifibss->timer, 1504 round_jiffies(jiffies + interval)); 1505 } 1506 } 1507 1508 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1509 struct sk_buff *req) 1510 { 1511 struct ieee80211_mgmt *mgmt = (void *)req->data; 1512 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1513 struct ieee80211_local *local = sdata->local; 1514 int tx_last_beacon, len = req->len; 1515 struct sk_buff *skb; 1516 struct beacon_data *presp; 1517 u8 *pos, *end; 1518 1519 sdata_assert_lock(sdata); 1520 1521 presp = rcu_dereference_protected(ifibss->presp, 1522 lockdep_is_held(&sdata->wdev.mtx)); 1523 1524 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1525 len < 24 + 2 || !presp) 1526 return; 1527 1528 tx_last_beacon = drv_tx_last_beacon(local); 1529 1530 ibss_dbg(sdata, 1531 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1532 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1533 1534 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1535 return; 1536 1537 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1538 !is_broadcast_ether_addr(mgmt->bssid)) 1539 return; 1540 1541 end = ((u8 *) mgmt) + len; 1542 pos = mgmt->u.probe_req.variable; 1543 if (pos[0] != WLAN_EID_SSID || 1544 pos + 2 + pos[1] > end) { 1545 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1546 mgmt->sa); 1547 return; 1548 } 1549 if (pos[1] != 0 && 1550 (pos[1] != ifibss->ssid_len || 1551 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1552 /* Ignore ProbeReq for foreign SSID */ 1553 return; 1554 } 1555 1556 /* Reply with ProbeResp */ 1557 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1558 if (!skb) 1559 return; 1560 1561 skb_reserve(skb, local->tx_headroom); 1562 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1563 1564 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1565 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1566 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1567 1568 /* avoid excessive retries for probe request to wildcard SSIDs */ 1569 if (pos[1] == 0) 1570 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1571 1572 ieee80211_tx_skb(sdata, skb); 1573 } 1574 1575 static 1576 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1577 struct ieee80211_mgmt *mgmt, size_t len, 1578 struct ieee80211_rx_status *rx_status) 1579 { 1580 size_t baselen; 1581 struct ieee802_11_elems elems; 1582 1583 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1584 offsetof(typeof(mgmt->u.beacon), variable)); 1585 1586 /* 1587 * either beacon or probe_resp but the variable field is at the 1588 * same offset 1589 */ 1590 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1591 if (baselen > len) 1592 return; 1593 1594 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1595 false, &elems); 1596 1597 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1598 } 1599 1600 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1601 struct sk_buff *skb) 1602 { 1603 struct ieee80211_rx_status *rx_status; 1604 struct ieee80211_mgmt *mgmt; 1605 u16 fc; 1606 struct ieee802_11_elems elems; 1607 int ies_len; 1608 1609 rx_status = IEEE80211_SKB_RXCB(skb); 1610 mgmt = (struct ieee80211_mgmt *) skb->data; 1611 fc = le16_to_cpu(mgmt->frame_control); 1612 1613 sdata_lock(sdata); 1614 1615 if (!sdata->u.ibss.ssid_len) 1616 goto mgmt_out; /* not ready to merge yet */ 1617 1618 switch (fc & IEEE80211_FCTL_STYPE) { 1619 case IEEE80211_STYPE_PROBE_REQ: 1620 ieee80211_rx_mgmt_probe_req(sdata, skb); 1621 break; 1622 case IEEE80211_STYPE_PROBE_RESP: 1623 case IEEE80211_STYPE_BEACON: 1624 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1625 rx_status); 1626 break; 1627 case IEEE80211_STYPE_AUTH: 1628 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1629 break; 1630 case IEEE80211_STYPE_DEAUTH: 1631 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1632 break; 1633 case IEEE80211_STYPE_ACTION: 1634 switch (mgmt->u.action.category) { 1635 case WLAN_CATEGORY_SPECTRUM_MGMT: 1636 ies_len = skb->len - 1637 offsetof(struct ieee80211_mgmt, 1638 u.action.u.chan_switch.variable); 1639 1640 if (ies_len < 0) 1641 break; 1642 1643 ieee802_11_parse_elems( 1644 mgmt->u.action.u.chan_switch.variable, 1645 ies_len, true, &elems); 1646 1647 if (elems.parse_error) 1648 break; 1649 1650 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1651 rx_status, &elems); 1652 break; 1653 } 1654 } 1655 1656 mgmt_out: 1657 sdata_unlock(sdata); 1658 } 1659 1660 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1661 { 1662 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1663 struct sta_info *sta; 1664 1665 sdata_lock(sdata); 1666 1667 /* 1668 * Work could be scheduled after scan or similar 1669 * when we aren't even joined (or trying) with a 1670 * network. 1671 */ 1672 if (!ifibss->ssid_len) 1673 goto out; 1674 1675 spin_lock_bh(&ifibss->incomplete_lock); 1676 while (!list_empty(&ifibss->incomplete_stations)) { 1677 sta = list_first_entry(&ifibss->incomplete_stations, 1678 struct sta_info, list); 1679 list_del(&sta->list); 1680 spin_unlock_bh(&ifibss->incomplete_lock); 1681 1682 ieee80211_ibss_finish_sta(sta); 1683 rcu_read_unlock(); 1684 spin_lock_bh(&ifibss->incomplete_lock); 1685 } 1686 spin_unlock_bh(&ifibss->incomplete_lock); 1687 1688 switch (ifibss->state) { 1689 case IEEE80211_IBSS_MLME_SEARCH: 1690 ieee80211_sta_find_ibss(sdata); 1691 break; 1692 case IEEE80211_IBSS_MLME_JOINED: 1693 ieee80211_sta_merge_ibss(sdata); 1694 break; 1695 default: 1696 WARN_ON(1); 1697 break; 1698 } 1699 1700 out: 1701 sdata_unlock(sdata); 1702 } 1703 1704 static void ieee80211_ibss_timer(unsigned long data) 1705 { 1706 struct ieee80211_sub_if_data *sdata = 1707 (struct ieee80211_sub_if_data *) data; 1708 1709 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1710 } 1711 1712 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1713 { 1714 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1715 1716 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1717 (unsigned long) sdata); 1718 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1719 spin_lock_init(&ifibss->incomplete_lock); 1720 INIT_WORK(&ifibss->csa_connection_drop_work, 1721 ieee80211_csa_connection_drop_work); 1722 } 1723 1724 /* scan finished notification */ 1725 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1726 { 1727 struct ieee80211_sub_if_data *sdata; 1728 1729 mutex_lock(&local->iflist_mtx); 1730 list_for_each_entry(sdata, &local->interfaces, list) { 1731 if (!ieee80211_sdata_running(sdata)) 1732 continue; 1733 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1734 continue; 1735 sdata->u.ibss.last_scan_completed = jiffies; 1736 } 1737 mutex_unlock(&local->iflist_mtx); 1738 } 1739 1740 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1741 struct cfg80211_ibss_params *params) 1742 { 1743 u32 changed = 0; 1744 u32 rate_flags; 1745 struct ieee80211_supported_band *sband; 1746 enum ieee80211_chanctx_mode chanmode; 1747 struct ieee80211_local *local = sdata->local; 1748 int radar_detect_width = 0; 1749 int i; 1750 int ret; 1751 1752 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1753 ¶ms->chandef, 1754 sdata->wdev.iftype); 1755 if (ret < 0) 1756 return ret; 1757 1758 if (ret > 0) { 1759 if (!params->userspace_handles_dfs) 1760 return -EINVAL; 1761 radar_detect_width = BIT(params->chandef.width); 1762 } 1763 1764 chanmode = (params->channel_fixed && !ret) ? 1765 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1766 1767 mutex_lock(&local->chanctx_mtx); 1768 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1769 radar_detect_width); 1770 mutex_unlock(&local->chanctx_mtx); 1771 if (ret < 0) 1772 return ret; 1773 1774 if (params->bssid) { 1775 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1776 sdata->u.ibss.fixed_bssid = true; 1777 } else 1778 sdata->u.ibss.fixed_bssid = false; 1779 1780 sdata->u.ibss.privacy = params->privacy; 1781 sdata->u.ibss.control_port = params->control_port; 1782 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1783 sdata->u.ibss.basic_rates = params->basic_rates; 1784 sdata->u.ibss.last_scan_completed = jiffies; 1785 1786 /* fix basic_rates if channel does not support these rates */ 1787 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1788 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1789 for (i = 0; i < sband->n_bitrates; i++) { 1790 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1791 sdata->u.ibss.basic_rates &= ~BIT(i); 1792 } 1793 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1794 sizeof(params->mcast_rate)); 1795 1796 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1797 1798 sdata->u.ibss.chandef = params->chandef; 1799 sdata->u.ibss.fixed_channel = params->channel_fixed; 1800 1801 if (params->ie) { 1802 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1803 GFP_KERNEL); 1804 if (sdata->u.ibss.ie) 1805 sdata->u.ibss.ie_len = params->ie_len; 1806 } 1807 1808 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1809 sdata->u.ibss.ibss_join_req = jiffies; 1810 1811 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1812 sdata->u.ibss.ssid_len = params->ssid_len; 1813 1814 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1815 sizeof(sdata->u.ibss.ht_capa)); 1816 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1817 sizeof(sdata->u.ibss.ht_capa_mask)); 1818 1819 /* 1820 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1821 * reserved, but an HT STA shall protect HT transmissions as though 1822 * the HT Protection field were set to non-HT mixed mode. 1823 * 1824 * In an IBSS, the RIFS Mode field of the HT Operation element is 1825 * also reserved, but an HT STA shall operate as though this field 1826 * were set to 1. 1827 */ 1828 1829 sdata->vif.bss_conf.ht_operation_mode |= 1830 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1831 | IEEE80211_HT_PARAM_RIFS_MODE; 1832 1833 changed |= BSS_CHANGED_HT; 1834 ieee80211_bss_info_change_notify(sdata, changed); 1835 1836 sdata->smps_mode = IEEE80211_SMPS_OFF; 1837 sdata->needed_rx_chains = local->rx_chains; 1838 1839 ieee80211_queue_work(&local->hw, &sdata->work); 1840 1841 return 0; 1842 } 1843 1844 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1845 { 1846 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1847 1848 ieee80211_ibss_disconnect(sdata); 1849 ifibss->ssid_len = 0; 1850 eth_zero_addr(ifibss->bssid); 1851 1852 /* remove beacon */ 1853 kfree(sdata->u.ibss.ie); 1854 1855 /* on the next join, re-program HT parameters */ 1856 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1857 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1858 1859 synchronize_rcu(); 1860 1861 skb_queue_purge(&sdata->skb_queue); 1862 1863 del_timer_sync(&sdata->u.ibss.timer); 1864 1865 return 0; 1866 } 1867