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 39 static struct beacon_data * 40 ieee80211_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 == NL80211_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; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static 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 == NL80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == NL80211_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 } 396 397 static 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_80P80: 433 case NL80211_CHAN_WIDTH_160: 434 chandef = sdata->u.ibss.chandef; 435 chandef.chan = cbss->channel; 436 break; 437 default: 438 /* fall back to 20 MHz for unsupported modes */ 439 cfg80211_chandef_create(&chandef, cbss->channel, 440 NL80211_CHAN_WIDTH_20_NOHT); 441 break; 442 } 443 444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 446 shift = ieee80211_vif_get_shift(&sdata->vif); 447 448 basic_rates = 0; 449 450 for (i = 0; i < bss->supp_rates_len; i++) { 451 int rate = bss->supp_rates[i] & 0x7f; 452 bool is_basic = !!(bss->supp_rates[i] & 0x80); 453 454 for (j = 0; j < sband->n_bitrates; j++) { 455 int brate; 456 if ((rate_flags & sband->bitrates[j].flags) 457 != rate_flags) 458 continue; 459 460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 461 5 * (1 << shift)); 462 if (brate == rate) { 463 if (is_basic) 464 basic_rates |= BIT(j); 465 break; 466 } 467 } 468 } 469 470 rcu_read_lock(); 471 ies = rcu_dereference(cbss->ies); 472 tsf = ies->tsf; 473 rcu_read_unlock(); 474 475 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 476 beacon_int, 477 &chandef, 478 basic_rates, 479 cbss->capability, 480 tsf, false); 481 } 482 483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 484 struct cfg80211_csa_settings *csa_settings) 485 { 486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 487 struct beacon_data *presp, *old_presp; 488 struct cfg80211_bss *cbss; 489 const struct cfg80211_bss_ies *ies; 490 u16 capability = 0; 491 u64 tsf; 492 int ret = 0; 493 494 sdata_assert_lock(sdata); 495 496 if (ifibss->privacy) 497 capability = WLAN_CAPABILITY_PRIVACY; 498 499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 500 ifibss->bssid, ifibss->ssid, 501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 502 IEEE80211_PRIVACY(ifibss->privacy)); 503 504 if (WARN_ON(!cbss)) { 505 ret = -EINVAL; 506 goto out; 507 } 508 509 rcu_read_lock(); 510 ies = rcu_dereference(cbss->ies); 511 tsf = ies->tsf; 512 rcu_read_unlock(); 513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 514 515 old_presp = rcu_dereference_protected(ifibss->presp, 516 lockdep_is_held(&sdata->wdev.mtx)); 517 518 presp = ieee80211_ibss_build_presp(sdata, 519 sdata->vif.bss_conf.beacon_int, 520 sdata->vif.bss_conf.basic_rates, 521 capability, tsf, &ifibss->chandef, 522 NULL, csa_settings); 523 if (!presp) { 524 ret = -ENOMEM; 525 goto out; 526 } 527 528 rcu_assign_pointer(ifibss->presp, presp); 529 if (old_presp) 530 kfree_rcu(old_presp, rcu_head); 531 532 return BSS_CHANGED_BEACON; 533 out: 534 return ret; 535 } 536 537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 538 { 539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 540 struct cfg80211_bss *cbss; 541 int err, changed = 0; 542 543 sdata_assert_lock(sdata); 544 545 /* update cfg80211 bss information with the new channel */ 546 if (!is_zero_ether_addr(ifibss->bssid)) { 547 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 548 ifibss->chandef.chan, 549 ifibss->bssid, ifibss->ssid, 550 ifibss->ssid_len, 551 IEEE80211_BSS_TYPE_IBSS, 552 IEEE80211_PRIVACY(ifibss->privacy)); 553 /* XXX: should not really modify cfg80211 data */ 554 if (cbss) { 555 cbss->channel = sdata->csa_chandef.chan; 556 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 557 } 558 } 559 560 ifibss->chandef = sdata->csa_chandef; 561 562 /* generate the beacon */ 563 err = ieee80211_ibss_csa_beacon(sdata, NULL); 564 if (err < 0) 565 return err; 566 567 changed |= err; 568 569 return changed; 570 } 571 572 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 573 { 574 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 575 576 cancel_work_sync(&ifibss->csa_connection_drop_work); 577 } 578 579 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 580 __acquires(RCU) 581 { 582 struct ieee80211_sub_if_data *sdata = sta->sdata; 583 u8 addr[ETH_ALEN]; 584 585 memcpy(addr, sta->sta.addr, ETH_ALEN); 586 587 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 588 589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 590 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 591 /* authorize the station only if the network is not RSN protected. If 592 * not wait for the userspace to authorize it */ 593 if (!sta->sdata->u.ibss.control_port) 594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 595 596 rate_control_rate_init(sta); 597 598 /* If it fails, maybe we raced another insertion? */ 599 if (sta_info_insert_rcu(sta)) 600 return sta_info_get(sdata, addr); 601 return sta; 602 } 603 604 static struct sta_info * 605 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 606 const u8 *addr, u32 supp_rates) 607 __acquires(RCU) 608 { 609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 610 struct ieee80211_local *local = sdata->local; 611 struct sta_info *sta; 612 struct ieee80211_chanctx_conf *chanctx_conf; 613 struct ieee80211_supported_band *sband; 614 enum nl80211_bss_scan_width scan_width; 615 int band; 616 617 /* 618 * XXX: Consider removing the least recently used entry and 619 * allow new one to be added. 620 */ 621 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 622 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 623 sdata->name, addr); 624 rcu_read_lock(); 625 return NULL; 626 } 627 628 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 629 rcu_read_lock(); 630 return NULL; 631 } 632 633 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 634 rcu_read_lock(); 635 return NULL; 636 } 637 638 rcu_read_lock(); 639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 640 if (WARN_ON_ONCE(!chanctx_conf)) 641 return NULL; 642 band = chanctx_conf->def.chan->band; 643 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 644 rcu_read_unlock(); 645 646 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 647 if (!sta) { 648 rcu_read_lock(); 649 return NULL; 650 } 651 652 /* make sure mandatory rates are always added */ 653 sband = local->hw.wiphy->bands[band]; 654 sta->sta.supp_rates[band] = supp_rates | 655 ieee80211_mandatory_rates(sband, scan_width); 656 657 return ieee80211_ibss_finish_sta(sta); 658 } 659 660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 661 { 662 struct ieee80211_local *local = sdata->local; 663 int active = 0; 664 struct sta_info *sta; 665 666 sdata_assert_lock(sdata); 667 668 rcu_read_lock(); 669 670 list_for_each_entry_rcu(sta, &local->sta_list, list) { 671 unsigned long last_active = ieee80211_sta_last_active(sta); 672 673 if (sta->sdata == sdata && 674 time_is_after_jiffies(last_active + 675 IEEE80211_IBSS_MERGE_INTERVAL)) { 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 nl80211_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 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1054 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1055 1056 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1057 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1058 &htcap_ie, 1059 sta); 1060 1061 if (elems->vht_operation && elems->vht_cap_elem && 1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1064 /* we both use VHT */ 1065 struct ieee80211_vht_cap cap_ie; 1066 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1067 1068 ieee80211_chandef_vht_oper(elems->vht_operation, 1069 &chandef); 1070 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1071 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1072 &cap_ie, sta); 1073 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1074 rates_updated |= true; 1075 } 1076 1077 if (bw != sta->sta.bandwidth) 1078 rates_updated |= true; 1079 1080 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1081 &chandef)) 1082 WARN_ON_ONCE(1); 1083 } 1084 1085 if (sta && rates_updated) { 1086 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1087 u8 rx_nss = sta->sta.rx_nss; 1088 1089 /* Force rx_nss recalculation */ 1090 sta->sta.rx_nss = 0; 1091 rate_control_rate_init(sta); 1092 if (sta->sta.rx_nss != rx_nss) 1093 changed |= IEEE80211_RC_NSS_CHANGED; 1094 1095 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1096 } 1097 1098 rcu_read_unlock(); 1099 } 1100 1101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1102 struct ieee80211_mgmt *mgmt, size_t len, 1103 struct ieee80211_rx_status *rx_status, 1104 struct ieee802_11_elems *elems) 1105 { 1106 struct ieee80211_local *local = sdata->local; 1107 struct cfg80211_bss *cbss; 1108 struct ieee80211_bss *bss; 1109 struct ieee80211_channel *channel; 1110 u64 beacon_timestamp, rx_timestamp; 1111 u32 supp_rates = 0; 1112 enum nl80211_band band = rx_status->band; 1113 1114 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1115 if (!channel) 1116 return; 1117 1118 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1119 1120 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1121 channel); 1122 if (!bss) 1123 return; 1124 1125 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1126 1127 /* same for beacon and probe response */ 1128 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1129 1130 /* check if we need to merge IBSS */ 1131 1132 /* not an IBSS */ 1133 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1134 goto put_bss; 1135 1136 /* different channel */ 1137 if (sdata->u.ibss.fixed_channel && 1138 sdata->u.ibss.chandef.chan != cbss->channel) 1139 goto put_bss; 1140 1141 /* different SSID */ 1142 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1143 memcmp(elems->ssid, sdata->u.ibss.ssid, 1144 sdata->u.ibss.ssid_len)) 1145 goto put_bss; 1146 1147 /* process channel switch */ 1148 if (sdata->vif.csa_active || 1149 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1150 goto put_bss; 1151 1152 /* same BSSID */ 1153 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1154 goto put_bss; 1155 1156 /* we use a fixed BSSID */ 1157 if (sdata->u.ibss.fixed_bssid) 1158 goto put_bss; 1159 1160 if (ieee80211_have_rx_timestamp(rx_status)) { 1161 /* time when timestamp field was received */ 1162 rx_timestamp = 1163 ieee80211_calculate_rx_timestamp(local, rx_status, 1164 len + FCS_LEN, 24); 1165 } else { 1166 /* 1167 * second best option: get current TSF 1168 * (will return -1 if not supported) 1169 */ 1170 rx_timestamp = drv_get_tsf(local, sdata); 1171 } 1172 1173 ibss_dbg(sdata, 1174 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1175 mgmt->sa, mgmt->bssid, 1176 (unsigned long long)rx_timestamp, 1177 (unsigned long long)beacon_timestamp, 1178 (unsigned long long)(rx_timestamp - beacon_timestamp), 1179 jiffies); 1180 1181 if (beacon_timestamp > rx_timestamp) { 1182 ibss_dbg(sdata, 1183 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1184 mgmt->bssid); 1185 ieee80211_sta_join_ibss(sdata, bss); 1186 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1187 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1188 supp_rates); 1189 rcu_read_unlock(); 1190 } 1191 1192 put_bss: 1193 ieee80211_rx_bss_put(local, bss); 1194 } 1195 1196 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1197 const u8 *bssid, const u8 *addr, 1198 u32 supp_rates) 1199 { 1200 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1201 struct ieee80211_local *local = sdata->local; 1202 struct sta_info *sta; 1203 struct ieee80211_chanctx_conf *chanctx_conf; 1204 struct ieee80211_supported_band *sband; 1205 enum nl80211_bss_scan_width scan_width; 1206 int band; 1207 1208 /* 1209 * XXX: Consider removing the least recently used entry and 1210 * allow new one to be added. 1211 */ 1212 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1213 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1214 sdata->name, addr); 1215 return; 1216 } 1217 1218 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1219 return; 1220 1221 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1222 return; 1223 1224 rcu_read_lock(); 1225 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1226 if (WARN_ON_ONCE(!chanctx_conf)) { 1227 rcu_read_unlock(); 1228 return; 1229 } 1230 band = chanctx_conf->def.chan->band; 1231 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1232 rcu_read_unlock(); 1233 1234 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1235 if (!sta) 1236 return; 1237 1238 /* make sure mandatory rates are always added */ 1239 sband = local->hw.wiphy->bands[band]; 1240 sta->sta.supp_rates[band] = supp_rates | 1241 ieee80211_mandatory_rates(sband, scan_width); 1242 1243 spin_lock(&ifibss->incomplete_lock); 1244 list_add(&sta->list, &ifibss->incomplete_stations); 1245 spin_unlock(&ifibss->incomplete_lock); 1246 ieee80211_queue_work(&local->hw, &sdata->work); 1247 } 1248 1249 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1250 { 1251 struct ieee80211_local *local = sdata->local; 1252 struct sta_info *sta, *tmp; 1253 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1254 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1255 1256 mutex_lock(&local->sta_mtx); 1257 1258 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1259 unsigned long last_active = ieee80211_sta_last_active(sta); 1260 1261 if (sdata != sta->sdata) 1262 continue; 1263 1264 if (time_is_before_jiffies(last_active + exp_time) || 1265 (time_is_before_jiffies(last_active + exp_rsn) && 1266 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1267 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1268 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1269 "not authorized " : "", sta->sta.addr); 1270 1271 WARN_ON(__sta_info_destroy(sta)); 1272 } 1273 } 1274 1275 mutex_unlock(&local->sta_mtx); 1276 } 1277 1278 /* 1279 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1280 */ 1281 1282 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1283 { 1284 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1285 enum nl80211_bss_scan_width scan_width; 1286 1287 sdata_assert_lock(sdata); 1288 1289 mod_timer(&ifibss->timer, 1290 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1291 1292 ieee80211_ibss_sta_expire(sdata); 1293 1294 if (time_before(jiffies, ifibss->last_scan_completed + 1295 IEEE80211_IBSS_MERGE_INTERVAL)) 1296 return; 1297 1298 if (ieee80211_sta_active_ibss(sdata)) 1299 return; 1300 1301 if (ifibss->fixed_channel) 1302 return; 1303 1304 sdata_info(sdata, 1305 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1306 1307 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1308 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1309 NULL, 0, scan_width); 1310 } 1311 1312 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1313 { 1314 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1315 u8 bssid[ETH_ALEN]; 1316 u16 capability; 1317 int i; 1318 1319 sdata_assert_lock(sdata); 1320 1321 if (ifibss->fixed_bssid) { 1322 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1323 } else { 1324 /* Generate random, not broadcast, locally administered BSSID. Mix in 1325 * own MAC address to make sure that devices that do not have proper 1326 * random number generator get different BSSID. */ 1327 get_random_bytes(bssid, ETH_ALEN); 1328 for (i = 0; i < ETH_ALEN; i++) 1329 bssid[i] ^= sdata->vif.addr[i]; 1330 bssid[0] &= ~0x01; 1331 bssid[0] |= 0x02; 1332 } 1333 1334 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1335 1336 capability = WLAN_CAPABILITY_IBSS; 1337 1338 if (ifibss->privacy) 1339 capability |= WLAN_CAPABILITY_PRIVACY; 1340 1341 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1342 &ifibss->chandef, ifibss->basic_rates, 1343 capability, 0, true); 1344 } 1345 1346 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1347 struct ieee80211_channel **channels, 1348 unsigned int channels_max, 1349 u32 center_freq, u32 width) 1350 { 1351 struct ieee80211_channel *chan = NULL; 1352 unsigned int n_chan = 0; 1353 u32 start_freq, end_freq, freq; 1354 1355 if (width <= 20) { 1356 start_freq = center_freq; 1357 end_freq = center_freq; 1358 } else { 1359 start_freq = center_freq - width / 2 + 10; 1360 end_freq = center_freq + width / 2 - 10; 1361 } 1362 1363 for (freq = start_freq; freq <= end_freq; freq += 20) { 1364 chan = ieee80211_get_channel(wiphy, freq); 1365 if (!chan) 1366 continue; 1367 if (n_chan >= channels_max) 1368 return n_chan; 1369 1370 channels[n_chan] = chan; 1371 n_chan++; 1372 } 1373 1374 return n_chan; 1375 } 1376 1377 static unsigned int 1378 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1379 const struct cfg80211_chan_def *chandef, 1380 struct ieee80211_channel **channels, 1381 unsigned int channels_max) 1382 { 1383 unsigned int n_chan = 0; 1384 u32 width, cf1, cf2 = 0; 1385 1386 switch (chandef->width) { 1387 case NL80211_CHAN_WIDTH_40: 1388 width = 40; 1389 break; 1390 case NL80211_CHAN_WIDTH_80P80: 1391 cf2 = chandef->center_freq2; 1392 /* fall through */ 1393 case NL80211_CHAN_WIDTH_80: 1394 width = 80; 1395 break; 1396 case NL80211_CHAN_WIDTH_160: 1397 width = 160; 1398 break; 1399 default: 1400 width = 20; 1401 break; 1402 } 1403 1404 cf1 = chandef->center_freq1; 1405 1406 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1407 1408 if (cf2) 1409 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1410 channels_max - n_chan, cf2, 1411 width); 1412 1413 return n_chan; 1414 } 1415 1416 /* 1417 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1418 */ 1419 1420 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1423 struct ieee80211_local *local = sdata->local; 1424 struct cfg80211_bss *cbss; 1425 struct ieee80211_channel *chan = NULL; 1426 const u8 *bssid = NULL; 1427 enum nl80211_bss_scan_width scan_width; 1428 int active_ibss; 1429 1430 sdata_assert_lock(sdata); 1431 1432 active_ibss = ieee80211_sta_active_ibss(sdata); 1433 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1434 1435 if (active_ibss) 1436 return; 1437 1438 if (ifibss->fixed_bssid) 1439 bssid = ifibss->bssid; 1440 if (ifibss->fixed_channel) 1441 chan = ifibss->chandef.chan; 1442 if (!is_zero_ether_addr(ifibss->bssid)) 1443 bssid = ifibss->bssid; 1444 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1445 ifibss->ssid, ifibss->ssid_len, 1446 IEEE80211_BSS_TYPE_IBSS, 1447 IEEE80211_PRIVACY(ifibss->privacy)); 1448 1449 if (cbss) { 1450 struct ieee80211_bss *bss; 1451 1452 bss = (void *)cbss->priv; 1453 ibss_dbg(sdata, 1454 "sta_find_ibss: selected %pM current %pM\n", 1455 cbss->bssid, ifibss->bssid); 1456 sdata_info(sdata, 1457 "Selected IBSS BSSID %pM based on configured SSID\n", 1458 cbss->bssid); 1459 1460 ieee80211_sta_join_ibss(sdata, bss); 1461 ieee80211_rx_bss_put(local, bss); 1462 return; 1463 } 1464 1465 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1466 * directly and do not waste time scanning 1467 */ 1468 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1469 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1470 bssid); 1471 ieee80211_sta_create_ibss(sdata); 1472 return; 1473 } 1474 1475 1476 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1477 1478 /* Selected IBSS not found in current scan results - try to scan */ 1479 if (time_after(jiffies, ifibss->last_scan_completed + 1480 IEEE80211_SCAN_INTERVAL)) { 1481 struct ieee80211_channel *channels[8]; 1482 unsigned int num; 1483 1484 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1485 1486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1487 1488 if (ifibss->fixed_channel) { 1489 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1490 &ifibss->chandef, 1491 channels, 1492 ARRAY_SIZE(channels)); 1493 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1494 ifibss->ssid_len, channels, 1495 num, scan_width); 1496 } else { 1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1498 ifibss->ssid_len, NULL, 1499 0, scan_width); 1500 } 1501 } else { 1502 int interval = IEEE80211_SCAN_INTERVAL; 1503 1504 if (time_after(jiffies, ifibss->ibss_join_req + 1505 IEEE80211_IBSS_JOIN_TIMEOUT)) 1506 ieee80211_sta_create_ibss(sdata); 1507 1508 mod_timer(&ifibss->timer, 1509 round_jiffies(jiffies + interval)); 1510 } 1511 } 1512 1513 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1514 struct sk_buff *req) 1515 { 1516 struct ieee80211_mgmt *mgmt = (void *)req->data; 1517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1518 struct ieee80211_local *local = sdata->local; 1519 int tx_last_beacon, len = req->len; 1520 struct sk_buff *skb; 1521 struct beacon_data *presp; 1522 u8 *pos, *end; 1523 1524 sdata_assert_lock(sdata); 1525 1526 presp = rcu_dereference_protected(ifibss->presp, 1527 lockdep_is_held(&sdata->wdev.mtx)); 1528 1529 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1530 len < 24 + 2 || !presp) 1531 return; 1532 1533 tx_last_beacon = drv_tx_last_beacon(local); 1534 1535 ibss_dbg(sdata, 1536 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1537 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1538 1539 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1540 return; 1541 1542 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1543 !is_broadcast_ether_addr(mgmt->bssid)) 1544 return; 1545 1546 end = ((u8 *) mgmt) + len; 1547 pos = mgmt->u.probe_req.variable; 1548 if (pos[0] != WLAN_EID_SSID || 1549 pos + 2 + pos[1] > end) { 1550 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1551 mgmt->sa); 1552 return; 1553 } 1554 if (pos[1] != 0 && 1555 (pos[1] != ifibss->ssid_len || 1556 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1557 /* Ignore ProbeReq for foreign SSID */ 1558 return; 1559 } 1560 1561 /* Reply with ProbeResp */ 1562 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1563 if (!skb) 1564 return; 1565 1566 skb_reserve(skb, local->tx_headroom); 1567 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1568 1569 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1570 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1571 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1572 1573 /* avoid excessive retries for probe request to wildcard SSIDs */ 1574 if (pos[1] == 0) 1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1576 1577 ieee80211_tx_skb(sdata, skb); 1578 } 1579 1580 static 1581 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1582 struct ieee80211_mgmt *mgmt, size_t len, 1583 struct ieee80211_rx_status *rx_status) 1584 { 1585 size_t baselen; 1586 struct ieee802_11_elems elems; 1587 1588 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1589 offsetof(typeof(mgmt->u.beacon), variable)); 1590 1591 /* 1592 * either beacon or probe_resp but the variable field is at the 1593 * same offset 1594 */ 1595 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1596 if (baselen > len) 1597 return; 1598 1599 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1600 false, &elems); 1601 1602 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1603 } 1604 1605 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1606 struct sk_buff *skb) 1607 { 1608 struct ieee80211_rx_status *rx_status; 1609 struct ieee80211_mgmt *mgmt; 1610 u16 fc; 1611 struct ieee802_11_elems elems; 1612 int ies_len; 1613 1614 rx_status = IEEE80211_SKB_RXCB(skb); 1615 mgmt = (struct ieee80211_mgmt *) skb->data; 1616 fc = le16_to_cpu(mgmt->frame_control); 1617 1618 sdata_lock(sdata); 1619 1620 if (!sdata->u.ibss.ssid_len) 1621 goto mgmt_out; /* not ready to merge yet */ 1622 1623 switch (fc & IEEE80211_FCTL_STYPE) { 1624 case IEEE80211_STYPE_PROBE_REQ: 1625 ieee80211_rx_mgmt_probe_req(sdata, skb); 1626 break; 1627 case IEEE80211_STYPE_PROBE_RESP: 1628 case IEEE80211_STYPE_BEACON: 1629 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1630 rx_status); 1631 break; 1632 case IEEE80211_STYPE_AUTH: 1633 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1634 break; 1635 case IEEE80211_STYPE_DEAUTH: 1636 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1637 break; 1638 case IEEE80211_STYPE_ACTION: 1639 switch (mgmt->u.action.category) { 1640 case WLAN_CATEGORY_SPECTRUM_MGMT: 1641 ies_len = skb->len - 1642 offsetof(struct ieee80211_mgmt, 1643 u.action.u.chan_switch.variable); 1644 1645 if (ies_len < 0) 1646 break; 1647 1648 ieee802_11_parse_elems( 1649 mgmt->u.action.u.chan_switch.variable, 1650 ies_len, true, &elems); 1651 1652 if (elems.parse_error) 1653 break; 1654 1655 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1656 rx_status, &elems); 1657 break; 1658 } 1659 } 1660 1661 mgmt_out: 1662 sdata_unlock(sdata); 1663 } 1664 1665 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1666 { 1667 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1668 struct sta_info *sta; 1669 1670 sdata_lock(sdata); 1671 1672 /* 1673 * Work could be scheduled after scan or similar 1674 * when we aren't even joined (or trying) with a 1675 * network. 1676 */ 1677 if (!ifibss->ssid_len) 1678 goto out; 1679 1680 spin_lock_bh(&ifibss->incomplete_lock); 1681 while (!list_empty(&ifibss->incomplete_stations)) { 1682 sta = list_first_entry(&ifibss->incomplete_stations, 1683 struct sta_info, list); 1684 list_del(&sta->list); 1685 spin_unlock_bh(&ifibss->incomplete_lock); 1686 1687 ieee80211_ibss_finish_sta(sta); 1688 rcu_read_unlock(); 1689 spin_lock_bh(&ifibss->incomplete_lock); 1690 } 1691 spin_unlock_bh(&ifibss->incomplete_lock); 1692 1693 switch (ifibss->state) { 1694 case IEEE80211_IBSS_MLME_SEARCH: 1695 ieee80211_sta_find_ibss(sdata); 1696 break; 1697 case IEEE80211_IBSS_MLME_JOINED: 1698 ieee80211_sta_merge_ibss(sdata); 1699 break; 1700 default: 1701 WARN_ON(1); 1702 break; 1703 } 1704 1705 out: 1706 sdata_unlock(sdata); 1707 } 1708 1709 static void ieee80211_ibss_timer(unsigned long data) 1710 { 1711 struct ieee80211_sub_if_data *sdata = 1712 (struct ieee80211_sub_if_data *) data; 1713 1714 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1715 } 1716 1717 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1718 { 1719 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1720 1721 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1722 (unsigned long) sdata); 1723 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1724 spin_lock_init(&ifibss->incomplete_lock); 1725 INIT_WORK(&ifibss->csa_connection_drop_work, 1726 ieee80211_csa_connection_drop_work); 1727 } 1728 1729 /* scan finished notification */ 1730 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1731 { 1732 struct ieee80211_sub_if_data *sdata; 1733 1734 mutex_lock(&local->iflist_mtx); 1735 list_for_each_entry(sdata, &local->interfaces, list) { 1736 if (!ieee80211_sdata_running(sdata)) 1737 continue; 1738 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1739 continue; 1740 sdata->u.ibss.last_scan_completed = jiffies; 1741 } 1742 mutex_unlock(&local->iflist_mtx); 1743 } 1744 1745 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1746 struct cfg80211_ibss_params *params) 1747 { 1748 u32 changed = 0; 1749 u32 rate_flags; 1750 struct ieee80211_supported_band *sband; 1751 enum ieee80211_chanctx_mode chanmode; 1752 struct ieee80211_local *local = sdata->local; 1753 int radar_detect_width = 0; 1754 int i; 1755 int ret; 1756 1757 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1758 ¶ms->chandef, 1759 sdata->wdev.iftype); 1760 if (ret < 0) 1761 return ret; 1762 1763 if (ret > 0) { 1764 if (!params->userspace_handles_dfs) 1765 return -EINVAL; 1766 radar_detect_width = BIT(params->chandef.width); 1767 } 1768 1769 chanmode = (params->channel_fixed && !ret) ? 1770 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1771 1772 mutex_lock(&local->chanctx_mtx); 1773 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1774 radar_detect_width); 1775 mutex_unlock(&local->chanctx_mtx); 1776 if (ret < 0) 1777 return ret; 1778 1779 if (params->bssid) { 1780 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1781 sdata->u.ibss.fixed_bssid = true; 1782 } else 1783 sdata->u.ibss.fixed_bssid = false; 1784 1785 sdata->u.ibss.privacy = params->privacy; 1786 sdata->u.ibss.control_port = params->control_port; 1787 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1788 sdata->u.ibss.basic_rates = params->basic_rates; 1789 sdata->u.ibss.last_scan_completed = jiffies; 1790 1791 /* fix basic_rates if channel does not support these rates */ 1792 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1793 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1794 for (i = 0; i < sband->n_bitrates; i++) { 1795 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1796 sdata->u.ibss.basic_rates &= ~BIT(i); 1797 } 1798 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1799 sizeof(params->mcast_rate)); 1800 1801 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1802 1803 sdata->u.ibss.chandef = params->chandef; 1804 sdata->u.ibss.fixed_channel = params->channel_fixed; 1805 1806 if (params->ie) { 1807 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1808 GFP_KERNEL); 1809 if (sdata->u.ibss.ie) 1810 sdata->u.ibss.ie_len = params->ie_len; 1811 } 1812 1813 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1814 sdata->u.ibss.ibss_join_req = jiffies; 1815 1816 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1817 sdata->u.ibss.ssid_len = params->ssid_len; 1818 1819 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1820 sizeof(sdata->u.ibss.ht_capa)); 1821 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1822 sizeof(sdata->u.ibss.ht_capa_mask)); 1823 1824 /* 1825 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1826 * reserved, but an HT STA shall protect HT transmissions as though 1827 * the HT Protection field were set to non-HT mixed mode. 1828 * 1829 * In an IBSS, the RIFS Mode field of the HT Operation element is 1830 * also reserved, but an HT STA shall operate as though this field 1831 * were set to 1. 1832 */ 1833 1834 sdata->vif.bss_conf.ht_operation_mode |= 1835 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1836 | IEEE80211_HT_PARAM_RIFS_MODE; 1837 1838 changed |= BSS_CHANGED_HT; 1839 ieee80211_bss_info_change_notify(sdata, changed); 1840 1841 sdata->smps_mode = IEEE80211_SMPS_OFF; 1842 sdata->needed_rx_chains = local->rx_chains; 1843 1844 ieee80211_queue_work(&local->hw, &sdata->work); 1845 1846 return 0; 1847 } 1848 1849 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1850 { 1851 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1852 1853 ieee80211_ibss_disconnect(sdata); 1854 ifibss->ssid_len = 0; 1855 eth_zero_addr(ifibss->bssid); 1856 1857 /* remove beacon */ 1858 kfree(sdata->u.ibss.ie); 1859 1860 /* on the next join, re-program HT parameters */ 1861 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1862 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1863 1864 synchronize_rcu(); 1865 1866 skb_queue_purge(&sdata->skb_queue); 1867 1868 del_timer_sync(&sdata->u.ibss.timer); 1869 1870 return 0; 1871 } 1872