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 == IEEE80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->csa_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->csa_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 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 == IEEE80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395 } 396 397 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 sta->rx_stats.last_rx = jiffies; 653 654 /* make sure mandatory rates are always added */ 655 sband = local->hw.wiphy->bands[band]; 656 sta->sta.supp_rates[band] = supp_rates | 657 ieee80211_mandatory_rates(sband, scan_width); 658 659 return ieee80211_ibss_finish_sta(sta); 660 } 661 662 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 663 { 664 struct ieee80211_local *local = sdata->local; 665 int active = 0; 666 struct sta_info *sta; 667 668 sdata_assert_lock(sdata); 669 670 rcu_read_lock(); 671 672 list_for_each_entry_rcu(sta, &local->sta_list, list) { 673 if (sta->sdata == sdata && 674 time_after(sta->rx_stats.last_rx + 675 IEEE80211_IBSS_MERGE_INTERVAL, 676 jiffies)) { 677 active++; 678 break; 679 } 680 } 681 682 rcu_read_unlock(); 683 684 return active; 685 } 686 687 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 688 { 689 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 690 struct ieee80211_local *local = sdata->local; 691 struct cfg80211_bss *cbss; 692 struct beacon_data *presp; 693 struct sta_info *sta; 694 695 if (!is_zero_ether_addr(ifibss->bssid)) { 696 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 697 ifibss->bssid, ifibss->ssid, 698 ifibss->ssid_len, 699 IEEE80211_BSS_TYPE_IBSS, 700 IEEE80211_PRIVACY(ifibss->privacy)); 701 702 if (cbss) { 703 cfg80211_unlink_bss(local->hw.wiphy, cbss); 704 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 705 } 706 } 707 708 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 709 710 sta_info_flush(sdata); 711 712 spin_lock_bh(&ifibss->incomplete_lock); 713 while (!list_empty(&ifibss->incomplete_stations)) { 714 sta = list_first_entry(&ifibss->incomplete_stations, 715 struct sta_info, list); 716 list_del(&sta->list); 717 spin_unlock_bh(&ifibss->incomplete_lock); 718 719 sta_info_free(local, sta); 720 spin_lock_bh(&ifibss->incomplete_lock); 721 } 722 spin_unlock_bh(&ifibss->incomplete_lock); 723 724 netif_carrier_off(sdata->dev); 725 726 sdata->vif.bss_conf.ibss_joined = false; 727 sdata->vif.bss_conf.ibss_creator = false; 728 sdata->vif.bss_conf.enable_beacon = false; 729 sdata->vif.bss_conf.ssid_len = 0; 730 731 /* remove beacon */ 732 presp = rcu_dereference_protected(ifibss->presp, 733 lockdep_is_held(&sdata->wdev.mtx)); 734 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 735 if (presp) 736 kfree_rcu(presp, rcu_head); 737 738 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 739 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 740 BSS_CHANGED_IBSS); 741 drv_leave_ibss(local, sdata); 742 mutex_lock(&local->mtx); 743 ieee80211_vif_release_channel(sdata); 744 mutex_unlock(&local->mtx); 745 } 746 747 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 748 { 749 struct ieee80211_sub_if_data *sdata = 750 container_of(work, struct ieee80211_sub_if_data, 751 u.ibss.csa_connection_drop_work); 752 753 sdata_lock(sdata); 754 755 ieee80211_ibss_disconnect(sdata); 756 synchronize_rcu(); 757 skb_queue_purge(&sdata->skb_queue); 758 759 /* trigger a scan to find another IBSS network to join */ 760 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 761 762 sdata_unlock(sdata); 763 } 764 765 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 766 { 767 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 768 int err; 769 770 /* if the current channel is a DFS channel, mark the channel as 771 * unavailable. 772 */ 773 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 774 &ifibss->chandef, 775 NL80211_IFTYPE_ADHOC); 776 if (err > 0) 777 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 778 GFP_ATOMIC); 779 } 780 781 static bool 782 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 783 struct ieee802_11_elems *elems, 784 bool beacon) 785 { 786 struct cfg80211_csa_settings params; 787 struct ieee80211_csa_ie csa_ie; 788 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 789 enum nl80211_channel_type ch_type; 790 int err; 791 u32 sta_flags; 792 793 sdata_assert_lock(sdata); 794 795 sta_flags = IEEE80211_STA_DISABLE_VHT; 796 switch (ifibss->chandef.width) { 797 case NL80211_CHAN_WIDTH_5: 798 case NL80211_CHAN_WIDTH_10: 799 case NL80211_CHAN_WIDTH_20_NOHT: 800 sta_flags |= IEEE80211_STA_DISABLE_HT; 801 /* fall through */ 802 case NL80211_CHAN_WIDTH_20: 803 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 804 break; 805 default: 806 break; 807 } 808 809 memset(¶ms, 0, sizeof(params)); 810 memset(&csa_ie, 0, sizeof(csa_ie)); 811 err = ieee80211_parse_ch_switch_ie(sdata, elems, 812 ifibss->chandef.chan->band, 813 sta_flags, ifibss->bssid, &csa_ie); 814 /* can't switch to destination channel, fail */ 815 if (err < 0) 816 goto disconnect; 817 818 /* did not contain a CSA */ 819 if (err) 820 return false; 821 822 /* channel switch is not supported, disconnect */ 823 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 824 goto disconnect; 825 826 params.count = csa_ie.count; 827 params.chandef = csa_ie.chandef; 828 829 switch (ifibss->chandef.width) { 830 case NL80211_CHAN_WIDTH_20_NOHT: 831 case NL80211_CHAN_WIDTH_20: 832 case NL80211_CHAN_WIDTH_40: 833 /* keep our current HT mode (HT20/HT40+/HT40-), even if 834 * another mode has been announced. The mode is not adopted 835 * within the beacon while doing CSA and we should therefore 836 * keep the mode which we announce. 837 */ 838 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 839 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 840 ch_type); 841 break; 842 case NL80211_CHAN_WIDTH_5: 843 case NL80211_CHAN_WIDTH_10: 844 if (params.chandef.width != ifibss->chandef.width) { 845 sdata_info(sdata, 846 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 847 ifibss->bssid, 848 params.chandef.chan->center_freq, 849 params.chandef.width, 850 params.chandef.center_freq1, 851 params.chandef.center_freq2); 852 goto disconnect; 853 } 854 break; 855 default: 856 /* should not happen, sta_flags should prevent VHT modes. */ 857 WARN_ON(1); 858 goto disconnect; 859 } 860 861 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 862 NL80211_IFTYPE_ADHOC)) { 863 sdata_info(sdata, 864 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 865 ifibss->bssid, 866 params.chandef.chan->center_freq, 867 params.chandef.width, 868 params.chandef.center_freq1, 869 params.chandef.center_freq2); 870 goto disconnect; 871 } 872 873 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 874 ¶ms.chandef, 875 NL80211_IFTYPE_ADHOC); 876 if (err < 0) 877 goto disconnect; 878 if (err > 0 && !ifibss->userspace_handles_dfs) { 879 /* IBSS-DFS only allowed with a control program */ 880 goto disconnect; 881 } 882 883 params.radar_required = err; 884 885 if (cfg80211_chandef_identical(¶ms.chandef, 886 &sdata->vif.bss_conf.chandef)) { 887 ibss_dbg(sdata, 888 "received csa with an identical chandef, ignoring\n"); 889 return true; 890 } 891 892 /* all checks done, now perform the channel switch. */ 893 ibss_dbg(sdata, 894 "received channel switch announcement to go to channel %d MHz\n", 895 params.chandef.chan->center_freq); 896 897 params.block_tx = !!csa_ie.mode; 898 899 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 900 ¶ms)) 901 goto disconnect; 902 903 ieee80211_ibss_csa_mark_radar(sdata); 904 905 return true; 906 disconnect: 907 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 908 ieee80211_queue_work(&sdata->local->hw, 909 &ifibss->csa_connection_drop_work); 910 911 ieee80211_ibss_csa_mark_radar(sdata); 912 913 return true; 914 } 915 916 static void 917 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 918 struct ieee80211_mgmt *mgmt, size_t len, 919 struct ieee80211_rx_status *rx_status, 920 struct ieee802_11_elems *elems) 921 { 922 int required_len; 923 924 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 925 return; 926 927 /* CSA is the only action we handle for now */ 928 if (mgmt->u.action.u.measurement.action_code != 929 WLAN_ACTION_SPCT_CHL_SWITCH) 930 return; 931 932 required_len = IEEE80211_MIN_ACTION_SIZE + 933 sizeof(mgmt->u.action.u.chan_switch); 934 if (len < required_len) 935 return; 936 937 if (!sdata->vif.csa_active) 938 ieee80211_ibss_process_chanswitch(sdata, elems, false); 939 } 940 941 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 942 struct ieee80211_mgmt *mgmt, 943 size_t len) 944 { 945 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 946 947 if (len < IEEE80211_DEAUTH_FRAME_LEN) 948 return; 949 950 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 951 mgmt->sa, mgmt->da, mgmt->bssid, reason); 952 sta_info_destroy_addr(sdata, mgmt->sa); 953 } 954 955 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 956 struct ieee80211_mgmt *mgmt, 957 size_t len) 958 { 959 u16 auth_alg, auth_transaction; 960 961 sdata_assert_lock(sdata); 962 963 if (len < 24 + 6) 964 return; 965 966 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 967 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 968 969 ibss_dbg(sdata, 970 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 971 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 972 973 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 974 return; 975 976 /* 977 * IEEE 802.11 standard does not require authentication in IBSS 978 * networks and most implementations do not seem to use it. 979 * However, try to reply to authentication attempts if someone 980 * has actually implemented this. 981 */ 982 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 983 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 984 } 985 986 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 987 struct ieee80211_mgmt *mgmt, size_t len, 988 struct ieee80211_rx_status *rx_status, 989 struct ieee802_11_elems *elems, 990 struct ieee80211_channel *channel) 991 { 992 struct sta_info *sta; 993 enum ieee80211_band band = rx_status->band; 994 enum nl80211_bss_scan_width scan_width; 995 struct ieee80211_local *local = sdata->local; 996 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 997 bool rates_updated = false; 998 u32 supp_rates = 0; 999 1000 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1001 return; 1002 1003 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1004 return; 1005 1006 rcu_read_lock(); 1007 sta = sta_info_get(sdata, mgmt->sa); 1008 1009 if (elems->supp_rates) { 1010 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1011 band, NULL); 1012 if (sta) { 1013 u32 prev_rates; 1014 1015 prev_rates = sta->sta.supp_rates[band]; 1016 /* make sure mandatory rates are always added */ 1017 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1018 if (rx_status->flag & RX_FLAG_5MHZ) 1019 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1020 if (rx_status->flag & RX_FLAG_10MHZ) 1021 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1022 1023 sta->sta.supp_rates[band] = supp_rates | 1024 ieee80211_mandatory_rates(sband, scan_width); 1025 if (sta->sta.supp_rates[band] != prev_rates) { 1026 ibss_dbg(sdata, 1027 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1028 sta->sta.addr, prev_rates, 1029 sta->sta.supp_rates[band]); 1030 rates_updated = true; 1031 } 1032 } else { 1033 rcu_read_unlock(); 1034 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1035 mgmt->sa, supp_rates); 1036 } 1037 } 1038 1039 if (sta && !sta->sta.wme && 1040 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { 1041 sta->sta.wme = true; 1042 ieee80211_check_fast_xmit(sta); 1043 } 1044 1045 if (sta && elems->ht_operation && elems->ht_cap_elem && 1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1049 /* we both use HT */ 1050 struct ieee80211_ht_cap htcap_ie; 1051 struct cfg80211_chan_def chandef; 1052 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1053 1054 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1055 ieee80211_chandef_ht_oper(elems->ht_operation, &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_chandef_vht_oper(elems->vht_operation, 1070 &chandef); 1071 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1072 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1073 &cap_ie, sta); 1074 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1075 rates_updated |= true; 1076 } 1077 1078 if (bw != sta->sta.bandwidth) 1079 rates_updated |= true; 1080 1081 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1082 &chandef)) 1083 WARN_ON_ONCE(1); 1084 } 1085 1086 if (sta && rates_updated) { 1087 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1088 u8 rx_nss = sta->sta.rx_nss; 1089 1090 /* Force rx_nss recalculation */ 1091 sta->sta.rx_nss = 0; 1092 rate_control_rate_init(sta); 1093 if (sta->sta.rx_nss != rx_nss) 1094 changed |= IEEE80211_RC_NSS_CHANGED; 1095 1096 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1097 } 1098 1099 rcu_read_unlock(); 1100 } 1101 1102 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1103 struct ieee80211_mgmt *mgmt, size_t len, 1104 struct ieee80211_rx_status *rx_status, 1105 struct ieee802_11_elems *elems) 1106 { 1107 struct ieee80211_local *local = sdata->local; 1108 struct cfg80211_bss *cbss; 1109 struct ieee80211_bss *bss; 1110 struct ieee80211_channel *channel; 1111 u64 beacon_timestamp, rx_timestamp; 1112 u32 supp_rates = 0; 1113 enum ieee80211_band band = rx_status->band; 1114 1115 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1116 if (!channel) 1117 return; 1118 1119 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1120 1121 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1122 channel); 1123 if (!bss) 1124 return; 1125 1126 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1127 1128 /* same for beacon and probe response */ 1129 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1130 1131 /* check if we need to merge IBSS */ 1132 1133 /* not an IBSS */ 1134 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1135 goto put_bss; 1136 1137 /* different channel */ 1138 if (sdata->u.ibss.fixed_channel && 1139 sdata->u.ibss.chandef.chan != cbss->channel) 1140 goto put_bss; 1141 1142 /* different SSID */ 1143 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1144 memcmp(elems->ssid, sdata->u.ibss.ssid, 1145 sdata->u.ibss.ssid_len)) 1146 goto put_bss; 1147 1148 /* process channel switch */ 1149 if (sdata->vif.csa_active || 1150 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1151 goto put_bss; 1152 1153 /* same BSSID */ 1154 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1155 goto put_bss; 1156 1157 /* we use a fixed BSSID */ 1158 if (sdata->u.ibss.fixed_bssid) 1159 goto put_bss; 1160 1161 if (ieee80211_have_rx_timestamp(rx_status)) { 1162 /* time when timestamp field was received */ 1163 rx_timestamp = 1164 ieee80211_calculate_rx_timestamp(local, rx_status, 1165 len + FCS_LEN, 24); 1166 } else { 1167 /* 1168 * second best option: get current TSF 1169 * (will return -1 if not supported) 1170 */ 1171 rx_timestamp = drv_get_tsf(local, sdata); 1172 } 1173 1174 ibss_dbg(sdata, 1175 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1176 mgmt->sa, mgmt->bssid, 1177 (unsigned long long)rx_timestamp, 1178 (unsigned long long)beacon_timestamp, 1179 (unsigned long long)(rx_timestamp - beacon_timestamp), 1180 jiffies); 1181 1182 if (beacon_timestamp > rx_timestamp) { 1183 ibss_dbg(sdata, 1184 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1185 mgmt->bssid); 1186 ieee80211_sta_join_ibss(sdata, bss); 1187 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1188 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1189 supp_rates); 1190 rcu_read_unlock(); 1191 } 1192 1193 put_bss: 1194 ieee80211_rx_bss_put(local, bss); 1195 } 1196 1197 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1198 const u8 *bssid, const u8 *addr, 1199 u32 supp_rates) 1200 { 1201 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1202 struct ieee80211_local *local = sdata->local; 1203 struct sta_info *sta; 1204 struct ieee80211_chanctx_conf *chanctx_conf; 1205 struct ieee80211_supported_band *sband; 1206 enum nl80211_bss_scan_width scan_width; 1207 int band; 1208 1209 /* 1210 * XXX: Consider removing the least recently used entry and 1211 * allow new one to be added. 1212 */ 1213 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1214 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1215 sdata->name, addr); 1216 return; 1217 } 1218 1219 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1220 return; 1221 1222 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1223 return; 1224 1225 rcu_read_lock(); 1226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1227 if (WARN_ON_ONCE(!chanctx_conf)) { 1228 rcu_read_unlock(); 1229 return; 1230 } 1231 band = chanctx_conf->def.chan->band; 1232 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1233 rcu_read_unlock(); 1234 1235 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1236 if (!sta) 1237 return; 1238 1239 sta->rx_stats.last_rx = jiffies; 1240 1241 /* make sure mandatory rates are always added */ 1242 sband = local->hw.wiphy->bands[band]; 1243 sta->sta.supp_rates[band] = supp_rates | 1244 ieee80211_mandatory_rates(sband, scan_width); 1245 1246 spin_lock(&ifibss->incomplete_lock); 1247 list_add(&sta->list, &ifibss->incomplete_stations); 1248 spin_unlock(&ifibss->incomplete_lock); 1249 ieee80211_queue_work(&local->hw, &sdata->work); 1250 } 1251 1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1253 { 1254 struct ieee80211_local *local = sdata->local; 1255 struct sta_info *sta, *tmp; 1256 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1257 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1258 1259 mutex_lock(&local->sta_mtx); 1260 1261 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1262 if (sdata != sta->sdata) 1263 continue; 1264 1265 if (time_after(jiffies, sta->rx_stats.last_rx + exp_time) || 1266 (time_after(jiffies, sta->rx_stats.last_rx + exp_rsn) && 1267 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1268 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1269 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1270 "not authorized " : "", sta->sta.addr); 1271 1272 WARN_ON(__sta_info_destroy(sta)); 1273 } 1274 } 1275 1276 mutex_unlock(&local->sta_mtx); 1277 } 1278 1279 /* 1280 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1281 */ 1282 1283 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1284 { 1285 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1286 enum nl80211_bss_scan_width scan_width; 1287 1288 sdata_assert_lock(sdata); 1289 1290 mod_timer(&ifibss->timer, 1291 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1292 1293 ieee80211_ibss_sta_expire(sdata); 1294 1295 if (time_before(jiffies, ifibss->last_scan_completed + 1296 IEEE80211_IBSS_MERGE_INTERVAL)) 1297 return; 1298 1299 if (ieee80211_sta_active_ibss(sdata)) 1300 return; 1301 1302 if (ifibss->fixed_channel) 1303 return; 1304 1305 sdata_info(sdata, 1306 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1307 1308 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1309 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1310 NULL, 0, scan_width); 1311 } 1312 1313 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1314 { 1315 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1316 u8 bssid[ETH_ALEN]; 1317 u16 capability; 1318 int i; 1319 1320 sdata_assert_lock(sdata); 1321 1322 if (ifibss->fixed_bssid) { 1323 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1324 } else { 1325 /* Generate random, not broadcast, locally administered BSSID. Mix in 1326 * own MAC address to make sure that devices that do not have proper 1327 * random number generator get different BSSID. */ 1328 get_random_bytes(bssid, ETH_ALEN); 1329 for (i = 0; i < ETH_ALEN; i++) 1330 bssid[i] ^= sdata->vif.addr[i]; 1331 bssid[0] &= ~0x01; 1332 bssid[0] |= 0x02; 1333 } 1334 1335 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1336 1337 capability = WLAN_CAPABILITY_IBSS; 1338 1339 if (ifibss->privacy) 1340 capability |= WLAN_CAPABILITY_PRIVACY; 1341 1342 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1343 &ifibss->chandef, ifibss->basic_rates, 1344 capability, 0, true); 1345 } 1346 1347 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1348 struct ieee80211_channel **channels, 1349 unsigned int channels_max, 1350 u32 center_freq, u32 width) 1351 { 1352 struct ieee80211_channel *chan = NULL; 1353 unsigned int n_chan = 0; 1354 u32 start_freq, end_freq, freq; 1355 1356 if (width <= 20) { 1357 start_freq = center_freq; 1358 end_freq = center_freq; 1359 } else { 1360 start_freq = center_freq - width / 2 + 10; 1361 end_freq = center_freq + width / 2 - 10; 1362 } 1363 1364 for (freq = start_freq; freq <= end_freq; freq += 20) { 1365 chan = ieee80211_get_channel(wiphy, freq); 1366 if (!chan) 1367 continue; 1368 if (n_chan >= channels_max) 1369 return n_chan; 1370 1371 channels[n_chan] = chan; 1372 n_chan++; 1373 } 1374 1375 return n_chan; 1376 } 1377 1378 static unsigned int 1379 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1380 const struct cfg80211_chan_def *chandef, 1381 struct ieee80211_channel **channels, 1382 unsigned int channels_max) 1383 { 1384 unsigned int n_chan = 0; 1385 u32 width, cf1, cf2 = 0; 1386 1387 switch (chandef->width) { 1388 case NL80211_CHAN_WIDTH_40: 1389 width = 40; 1390 break; 1391 case NL80211_CHAN_WIDTH_80P80: 1392 cf2 = chandef->center_freq2; 1393 /* fall through */ 1394 case NL80211_CHAN_WIDTH_80: 1395 width = 80; 1396 break; 1397 case NL80211_CHAN_WIDTH_160: 1398 width = 160; 1399 break; 1400 default: 1401 width = 20; 1402 break; 1403 } 1404 1405 cf1 = chandef->center_freq1; 1406 1407 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1408 1409 if (cf2) 1410 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1411 channels_max - n_chan, cf2, 1412 width); 1413 1414 return n_chan; 1415 } 1416 1417 /* 1418 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1419 */ 1420 1421 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1422 { 1423 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1424 struct ieee80211_local *local = sdata->local; 1425 struct cfg80211_bss *cbss; 1426 struct ieee80211_channel *chan = NULL; 1427 const u8 *bssid = NULL; 1428 enum nl80211_bss_scan_width scan_width; 1429 int active_ibss; 1430 1431 sdata_assert_lock(sdata); 1432 1433 active_ibss = ieee80211_sta_active_ibss(sdata); 1434 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1435 1436 if (active_ibss) 1437 return; 1438 1439 if (ifibss->fixed_bssid) 1440 bssid = ifibss->bssid; 1441 if (ifibss->fixed_channel) 1442 chan = ifibss->chandef.chan; 1443 if (!is_zero_ether_addr(ifibss->bssid)) 1444 bssid = ifibss->bssid; 1445 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1446 ifibss->ssid, ifibss->ssid_len, 1447 IEEE80211_BSS_TYPE_IBSS, 1448 IEEE80211_PRIVACY(ifibss->privacy)); 1449 1450 if (cbss) { 1451 struct ieee80211_bss *bss; 1452 1453 bss = (void *)cbss->priv; 1454 ibss_dbg(sdata, 1455 "sta_find_ibss: selected %pM current %pM\n", 1456 cbss->bssid, ifibss->bssid); 1457 sdata_info(sdata, 1458 "Selected IBSS BSSID %pM based on configured SSID\n", 1459 cbss->bssid); 1460 1461 ieee80211_sta_join_ibss(sdata, bss); 1462 ieee80211_rx_bss_put(local, bss); 1463 return; 1464 } 1465 1466 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1467 * directly and do not waste time scanning 1468 */ 1469 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1470 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1471 bssid); 1472 ieee80211_sta_create_ibss(sdata); 1473 return; 1474 } 1475 1476 1477 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1478 1479 /* Selected IBSS not found in current scan results - try to scan */ 1480 if (time_after(jiffies, ifibss->last_scan_completed + 1481 IEEE80211_SCAN_INTERVAL)) { 1482 struct ieee80211_channel *channels[8]; 1483 unsigned int num; 1484 1485 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1486 1487 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1488 1489 if (ifibss->fixed_channel) { 1490 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1491 &ifibss->chandef, 1492 channels, 1493 ARRAY_SIZE(channels)); 1494 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1495 ifibss->ssid_len, channels, 1496 num, scan_width); 1497 } else { 1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1499 ifibss->ssid_len, NULL, 1500 0, scan_width); 1501 } 1502 } else { 1503 int interval = IEEE80211_SCAN_INTERVAL; 1504 1505 if (time_after(jiffies, ifibss->ibss_join_req + 1506 IEEE80211_IBSS_JOIN_TIMEOUT)) 1507 ieee80211_sta_create_ibss(sdata); 1508 1509 mod_timer(&ifibss->timer, 1510 round_jiffies(jiffies + interval)); 1511 } 1512 } 1513 1514 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1515 struct sk_buff *req) 1516 { 1517 struct ieee80211_mgmt *mgmt = (void *)req->data; 1518 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1519 struct ieee80211_local *local = sdata->local; 1520 int tx_last_beacon, len = req->len; 1521 struct sk_buff *skb; 1522 struct beacon_data *presp; 1523 u8 *pos, *end; 1524 1525 sdata_assert_lock(sdata); 1526 1527 presp = rcu_dereference_protected(ifibss->presp, 1528 lockdep_is_held(&sdata->wdev.mtx)); 1529 1530 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1531 len < 24 + 2 || !presp) 1532 return; 1533 1534 tx_last_beacon = drv_tx_last_beacon(local); 1535 1536 ibss_dbg(sdata, 1537 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1538 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1539 1540 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1541 return; 1542 1543 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1544 !is_broadcast_ether_addr(mgmt->bssid)) 1545 return; 1546 1547 end = ((u8 *) mgmt) + len; 1548 pos = mgmt->u.probe_req.variable; 1549 if (pos[0] != WLAN_EID_SSID || 1550 pos + 2 + pos[1] > end) { 1551 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1552 mgmt->sa); 1553 return; 1554 } 1555 if (pos[1] != 0 && 1556 (pos[1] != ifibss->ssid_len || 1557 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1558 /* Ignore ProbeReq for foreign SSID */ 1559 return; 1560 } 1561 1562 /* Reply with ProbeResp */ 1563 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1564 if (!skb) 1565 return; 1566 1567 skb_reserve(skb, local->tx_headroom); 1568 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1569 1570 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1571 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1572 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1573 1574 /* avoid excessive retries for probe request to wildcard SSIDs */ 1575 if (pos[1] == 0) 1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1577 1578 ieee80211_tx_skb(sdata, skb); 1579 } 1580 1581 static 1582 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1583 struct ieee80211_mgmt *mgmt, size_t len, 1584 struct ieee80211_rx_status *rx_status) 1585 { 1586 size_t baselen; 1587 struct ieee802_11_elems elems; 1588 1589 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1590 offsetof(typeof(mgmt->u.beacon), variable)); 1591 1592 /* 1593 * either beacon or probe_resp but the variable field is at the 1594 * same offset 1595 */ 1596 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1597 if (baselen > len) 1598 return; 1599 1600 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1601 false, &elems); 1602 1603 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1604 } 1605 1606 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1607 struct sk_buff *skb) 1608 { 1609 struct ieee80211_rx_status *rx_status; 1610 struct ieee80211_mgmt *mgmt; 1611 u16 fc; 1612 struct ieee802_11_elems elems; 1613 int ies_len; 1614 1615 rx_status = IEEE80211_SKB_RXCB(skb); 1616 mgmt = (struct ieee80211_mgmt *) skb->data; 1617 fc = le16_to_cpu(mgmt->frame_control); 1618 1619 sdata_lock(sdata); 1620 1621 if (!sdata->u.ibss.ssid_len) 1622 goto mgmt_out; /* not ready to merge yet */ 1623 1624 switch (fc & IEEE80211_FCTL_STYPE) { 1625 case IEEE80211_STYPE_PROBE_REQ: 1626 ieee80211_rx_mgmt_probe_req(sdata, skb); 1627 break; 1628 case IEEE80211_STYPE_PROBE_RESP: 1629 case IEEE80211_STYPE_BEACON: 1630 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1631 rx_status); 1632 break; 1633 case IEEE80211_STYPE_AUTH: 1634 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1635 break; 1636 case IEEE80211_STYPE_DEAUTH: 1637 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1638 break; 1639 case IEEE80211_STYPE_ACTION: 1640 switch (mgmt->u.action.category) { 1641 case WLAN_CATEGORY_SPECTRUM_MGMT: 1642 ies_len = skb->len - 1643 offsetof(struct ieee80211_mgmt, 1644 u.action.u.chan_switch.variable); 1645 1646 if (ies_len < 0) 1647 break; 1648 1649 ieee802_11_parse_elems( 1650 mgmt->u.action.u.chan_switch.variable, 1651 ies_len, true, &elems); 1652 1653 if (elems.parse_error) 1654 break; 1655 1656 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1657 rx_status, &elems); 1658 break; 1659 } 1660 } 1661 1662 mgmt_out: 1663 sdata_unlock(sdata); 1664 } 1665 1666 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1667 { 1668 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1669 struct sta_info *sta; 1670 1671 sdata_lock(sdata); 1672 1673 /* 1674 * Work could be scheduled after scan or similar 1675 * when we aren't even joined (or trying) with a 1676 * network. 1677 */ 1678 if (!ifibss->ssid_len) 1679 goto out; 1680 1681 spin_lock_bh(&ifibss->incomplete_lock); 1682 while (!list_empty(&ifibss->incomplete_stations)) { 1683 sta = list_first_entry(&ifibss->incomplete_stations, 1684 struct sta_info, list); 1685 list_del(&sta->list); 1686 spin_unlock_bh(&ifibss->incomplete_lock); 1687 1688 ieee80211_ibss_finish_sta(sta); 1689 rcu_read_unlock(); 1690 spin_lock_bh(&ifibss->incomplete_lock); 1691 } 1692 spin_unlock_bh(&ifibss->incomplete_lock); 1693 1694 switch (ifibss->state) { 1695 case IEEE80211_IBSS_MLME_SEARCH: 1696 ieee80211_sta_find_ibss(sdata); 1697 break; 1698 case IEEE80211_IBSS_MLME_JOINED: 1699 ieee80211_sta_merge_ibss(sdata); 1700 break; 1701 default: 1702 WARN_ON(1); 1703 break; 1704 } 1705 1706 out: 1707 sdata_unlock(sdata); 1708 } 1709 1710 static void ieee80211_ibss_timer(unsigned long data) 1711 { 1712 struct ieee80211_sub_if_data *sdata = 1713 (struct ieee80211_sub_if_data *) data; 1714 1715 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1716 } 1717 1718 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1719 { 1720 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1721 1722 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1723 (unsigned long) sdata); 1724 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1725 spin_lock_init(&ifibss->incomplete_lock); 1726 INIT_WORK(&ifibss->csa_connection_drop_work, 1727 ieee80211_csa_connection_drop_work); 1728 } 1729 1730 /* scan finished notification */ 1731 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1732 { 1733 struct ieee80211_sub_if_data *sdata; 1734 1735 mutex_lock(&local->iflist_mtx); 1736 list_for_each_entry(sdata, &local->interfaces, list) { 1737 if (!ieee80211_sdata_running(sdata)) 1738 continue; 1739 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1740 continue; 1741 sdata->u.ibss.last_scan_completed = jiffies; 1742 } 1743 mutex_unlock(&local->iflist_mtx); 1744 } 1745 1746 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1747 struct cfg80211_ibss_params *params) 1748 { 1749 u32 changed = 0; 1750 u32 rate_flags; 1751 struct ieee80211_supported_band *sband; 1752 enum ieee80211_chanctx_mode chanmode; 1753 struct ieee80211_local *local = sdata->local; 1754 int radar_detect_width = 0; 1755 int i; 1756 int ret; 1757 1758 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1759 ¶ms->chandef, 1760 sdata->wdev.iftype); 1761 if (ret < 0) 1762 return ret; 1763 1764 if (ret > 0) { 1765 if (!params->userspace_handles_dfs) 1766 return -EINVAL; 1767 radar_detect_width = BIT(params->chandef.width); 1768 } 1769 1770 chanmode = (params->channel_fixed && !ret) ? 1771 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1772 1773 mutex_lock(&local->chanctx_mtx); 1774 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1775 radar_detect_width); 1776 mutex_unlock(&local->chanctx_mtx); 1777 if (ret < 0) 1778 return ret; 1779 1780 if (params->bssid) { 1781 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1782 sdata->u.ibss.fixed_bssid = true; 1783 } else 1784 sdata->u.ibss.fixed_bssid = false; 1785 1786 sdata->u.ibss.privacy = params->privacy; 1787 sdata->u.ibss.control_port = params->control_port; 1788 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1789 sdata->u.ibss.basic_rates = params->basic_rates; 1790 sdata->u.ibss.last_scan_completed = jiffies; 1791 1792 /* fix basic_rates if channel does not support these rates */ 1793 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1794 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1795 for (i = 0; i < sband->n_bitrates; i++) { 1796 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1797 sdata->u.ibss.basic_rates &= ~BIT(i); 1798 } 1799 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1800 sizeof(params->mcast_rate)); 1801 1802 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1803 1804 sdata->u.ibss.chandef = params->chandef; 1805 sdata->u.ibss.fixed_channel = params->channel_fixed; 1806 1807 if (params->ie) { 1808 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1809 GFP_KERNEL); 1810 if (sdata->u.ibss.ie) 1811 sdata->u.ibss.ie_len = params->ie_len; 1812 } 1813 1814 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1815 sdata->u.ibss.ibss_join_req = jiffies; 1816 1817 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1818 sdata->u.ibss.ssid_len = params->ssid_len; 1819 1820 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1821 sizeof(sdata->u.ibss.ht_capa)); 1822 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1823 sizeof(sdata->u.ibss.ht_capa_mask)); 1824 1825 /* 1826 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1827 * reserved, but an HT STA shall protect HT transmissions as though 1828 * the HT Protection field were set to non-HT mixed mode. 1829 * 1830 * In an IBSS, the RIFS Mode field of the HT Operation element is 1831 * also reserved, but an HT STA shall operate as though this field 1832 * were set to 1. 1833 */ 1834 1835 sdata->vif.bss_conf.ht_operation_mode |= 1836 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1837 | IEEE80211_HT_PARAM_RIFS_MODE; 1838 1839 changed |= BSS_CHANGED_HT; 1840 ieee80211_bss_info_change_notify(sdata, changed); 1841 1842 sdata->smps_mode = IEEE80211_SMPS_OFF; 1843 sdata->needed_rx_chains = local->rx_chains; 1844 1845 ieee80211_queue_work(&local->hw, &sdata->work); 1846 1847 return 0; 1848 } 1849 1850 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1851 { 1852 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1853 1854 ieee80211_ibss_disconnect(sdata); 1855 ifibss->ssid_len = 0; 1856 eth_zero_addr(ifibss->bssid); 1857 1858 /* remove beacon */ 1859 kfree(sdata->u.ibss.ie); 1860 1861 /* on the next join, re-program HT parameters */ 1862 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1863 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1864 1865 synchronize_rcu(); 1866 1867 skb_queue_purge(&sdata->skb_queue); 1868 1869 del_timer_sync(&sdata->u.ibss.timer); 1870 1871 return 0; 1872 } 1873