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 2 + sizeof(struct ieee80211_vht_cap) + 70 2 + sizeof(struct ieee80211_vht_operation) + 71 ifibss->ie_len; 72 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 73 if (!presp) 74 return NULL; 75 76 presp->head = (void *)(presp + 1); 77 78 mgmt = (void *) presp->head; 79 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 80 IEEE80211_STYPE_PROBE_RESP); 81 eth_broadcast_addr(mgmt->da); 82 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 83 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 84 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 85 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 86 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 87 88 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 89 90 *pos++ = WLAN_EID_SSID; 91 *pos++ = ifibss->ssid_len; 92 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 93 pos += ifibss->ssid_len; 94 95 sband = local->hw.wiphy->bands[chandef->chan->band]; 96 rate_flags = ieee80211_chandef_rate_flags(chandef); 97 shift = ieee80211_chandef_get_shift(chandef); 98 rates_n = 0; 99 if (have_higher_than_11mbit) 100 *have_higher_than_11mbit = false; 101 102 for (i = 0; i < sband->n_bitrates; i++) { 103 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 104 continue; 105 if (sband->bitrates[i].bitrate > 110 && 106 have_higher_than_11mbit) 107 *have_higher_than_11mbit = true; 108 109 rates |= BIT(i); 110 rates_n++; 111 } 112 113 *pos++ = WLAN_EID_SUPP_RATES; 114 *pos++ = min_t(int, 8, rates_n); 115 for (ri = 0; ri < sband->n_bitrates; ri++) { 116 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 117 5 * (1 << shift)); 118 u8 basic = 0; 119 if (!(rates & BIT(ri))) 120 continue; 121 122 if (basic_rates & BIT(ri)) 123 basic = 0x80; 124 *pos++ = basic | (u8) rate; 125 if (++rates_added == 8) { 126 ri++; /* continue at next rate for EXT_SUPP_RATES */ 127 break; 128 } 129 } 130 131 if (sband->band == NL80211_BAND_2GHZ) { 132 *pos++ = WLAN_EID_DS_PARAMS; 133 *pos++ = 1; 134 *pos++ = ieee80211_frequency_to_channel( 135 chandef->chan->center_freq); 136 } 137 138 *pos++ = WLAN_EID_IBSS_PARAMS; 139 *pos++ = 2; 140 /* FIX: set ATIM window based on scan results */ 141 *pos++ = 0; 142 *pos++ = 0; 143 144 if (csa_settings) { 145 *pos++ = WLAN_EID_CHANNEL_SWITCH; 146 *pos++ = 3; 147 *pos++ = csa_settings->block_tx ? 1 : 0; 148 *pos++ = ieee80211_frequency_to_channel( 149 csa_settings->chandef.chan->center_freq); 150 presp->csa_counter_offsets[0] = (pos - presp->head); 151 *pos++ = csa_settings->count; 152 presp->csa_current_counter = csa_settings->count; 153 } 154 155 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 156 if (rates_n > 8) { 157 *pos++ = WLAN_EID_EXT_SUPP_RATES; 158 *pos++ = rates_n - 8; 159 for (; ri < sband->n_bitrates; ri++) { 160 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 161 5 * (1 << shift)); 162 u8 basic = 0; 163 if (!(rates & BIT(ri))) 164 continue; 165 166 if (basic_rates & BIT(ri)) 167 basic = 0x80; 168 *pos++ = basic | (u8) rate; 169 } 170 } 171 172 if (ifibss->ie_len) { 173 memcpy(pos, ifibss->ie, ifibss->ie_len); 174 pos += ifibss->ie_len; 175 } 176 177 /* add HT capability and information IEs */ 178 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 179 chandef->width != NL80211_CHAN_WIDTH_5 && 180 chandef->width != NL80211_CHAN_WIDTH_10 && 181 sband->ht_cap.ht_supported) { 182 struct ieee80211_sta_ht_cap ht_cap; 183 184 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 185 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 186 187 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 188 /* 189 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 190 * field and RIFS Mode are reserved in IBSS mode, therefore 191 * keep them at 0 192 */ 193 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 194 chandef, 0, false); 195 196 /* add VHT capability and information IEs */ 197 if (chandef->width != NL80211_CHAN_WIDTH_20 && 198 chandef->width != NL80211_CHAN_WIDTH_40 && 199 sband->vht_cap.vht_supported) { 200 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 201 sband->vht_cap.cap); 202 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 203 chandef); 204 } 205 } 206 207 if (local->hw.queues >= IEEE80211_NUM_ACS) 208 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 209 210 presp->head_len = pos - presp->head; 211 if (WARN_ON(presp->head_len > frame_len)) 212 goto error; 213 214 return presp; 215 error: 216 kfree(presp); 217 return NULL; 218 } 219 220 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 221 const u8 *bssid, const int beacon_int, 222 struct cfg80211_chan_def *req_chandef, 223 const u32 basic_rates, 224 const u16 capability, u64 tsf, 225 bool creator) 226 { 227 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 228 struct ieee80211_local *local = sdata->local; 229 struct ieee80211_mgmt *mgmt; 230 struct cfg80211_bss *bss; 231 u32 bss_change; 232 struct cfg80211_chan_def chandef; 233 struct ieee80211_channel *chan; 234 struct beacon_data *presp; 235 struct cfg80211_inform_bss bss_meta = {}; 236 bool have_higher_than_11mbit; 237 bool radar_required; 238 int err; 239 240 sdata_assert_lock(sdata); 241 242 /* Reset own TSF to allow time synchronization work. */ 243 drv_reset_tsf(local, sdata); 244 245 if (!ether_addr_equal(ifibss->bssid, bssid)) 246 sta_info_flush(sdata); 247 248 /* if merging, indicate to driver that we leave the old IBSS */ 249 if (sdata->vif.bss_conf.ibss_joined) { 250 sdata->vif.bss_conf.ibss_joined = false; 251 sdata->vif.bss_conf.ibss_creator = false; 252 sdata->vif.bss_conf.enable_beacon = false; 253 netif_carrier_off(sdata->dev); 254 ieee80211_bss_info_change_notify(sdata, 255 BSS_CHANGED_IBSS | 256 BSS_CHANGED_BEACON_ENABLED); 257 drv_leave_ibss(local, sdata); 258 } 259 260 presp = rcu_dereference_protected(ifibss->presp, 261 lockdep_is_held(&sdata->wdev.mtx)); 262 RCU_INIT_POINTER(ifibss->presp, NULL); 263 if (presp) 264 kfree_rcu(presp, rcu_head); 265 266 /* make a copy of the chandef, it could be modified below. */ 267 chandef = *req_chandef; 268 chan = chandef.chan; 269 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 270 NL80211_IFTYPE_ADHOC)) { 271 if (chandef.width == NL80211_CHAN_WIDTH_5 || 272 chandef.width == NL80211_CHAN_WIDTH_10 || 273 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 274 chandef.width == NL80211_CHAN_WIDTH_20) { 275 sdata_info(sdata, 276 "Failed to join IBSS, beacons forbidden\n"); 277 return; 278 } 279 chandef.width = NL80211_CHAN_WIDTH_20; 280 chandef.center_freq1 = chan->center_freq; 281 /* check again for downgraded chandef */ 282 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 283 NL80211_IFTYPE_ADHOC)) { 284 sdata_info(sdata, 285 "Failed to join IBSS, beacons forbidden\n"); 286 return; 287 } 288 } 289 290 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 291 &chandef, NL80211_IFTYPE_ADHOC); 292 if (err < 0) { 293 sdata_info(sdata, 294 "Failed to join IBSS, invalid chandef\n"); 295 return; 296 } 297 if (err > 0 && !ifibss->userspace_handles_dfs) { 298 sdata_info(sdata, 299 "Failed to join IBSS, DFS channel without control program\n"); 300 return; 301 } 302 303 radar_required = err; 304 305 mutex_lock(&local->mtx); 306 if (ieee80211_vif_use_channel(sdata, &chandef, 307 ifibss->fixed_channel ? 308 IEEE80211_CHANCTX_SHARED : 309 IEEE80211_CHANCTX_EXCLUSIVE)) { 310 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 311 mutex_unlock(&local->mtx); 312 return; 313 } 314 sdata->radar_required = radar_required; 315 mutex_unlock(&local->mtx); 316 317 memcpy(ifibss->bssid, bssid, ETH_ALEN); 318 319 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 320 capability, tsf, &chandef, 321 &have_higher_than_11mbit, NULL); 322 if (!presp) 323 return; 324 325 rcu_assign_pointer(ifibss->presp, presp); 326 mgmt = (void *)presp->head; 327 328 sdata->vif.bss_conf.enable_beacon = true; 329 sdata->vif.bss_conf.beacon_int = beacon_int; 330 sdata->vif.bss_conf.basic_rates = basic_rates; 331 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 332 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 333 bss_change = BSS_CHANGED_BEACON_INT; 334 bss_change |= ieee80211_reset_erp_info(sdata); 335 bss_change |= BSS_CHANGED_BSSID; 336 bss_change |= BSS_CHANGED_BEACON; 337 bss_change |= BSS_CHANGED_BEACON_ENABLED; 338 bss_change |= BSS_CHANGED_BASIC_RATES; 339 bss_change |= BSS_CHANGED_HT; 340 bss_change |= BSS_CHANGED_IBSS; 341 bss_change |= BSS_CHANGED_SSID; 342 343 /* 344 * In 5 GHz/802.11a, we can always use short slot time. 345 * (IEEE 802.11-2012 18.3.8.7) 346 * 347 * In 2.4GHz, we must always use long slots in IBSS for compatibility 348 * reasons. 349 * (IEEE 802.11-2012 19.4.5) 350 * 351 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 352 */ 353 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 354 bss_change |= BSS_CHANGED_ERP_SLOT; 355 356 /* cf. IEEE 802.11 9.2.12 */ 357 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit) 358 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 359 else 360 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 361 362 ieee80211_set_wmm_default(sdata, true, false); 363 364 sdata->vif.bss_conf.ibss_joined = true; 365 sdata->vif.bss_conf.ibss_creator = creator; 366 367 err = drv_join_ibss(local, sdata); 368 if (err) { 369 sdata->vif.bss_conf.ibss_joined = false; 370 sdata->vif.bss_conf.ibss_creator = false; 371 sdata->vif.bss_conf.enable_beacon = false; 372 sdata->vif.bss_conf.ssid_len = 0; 373 RCU_INIT_POINTER(ifibss->presp, NULL); 374 kfree_rcu(presp, rcu_head); 375 mutex_lock(&local->mtx); 376 ieee80211_vif_release_channel(sdata); 377 mutex_unlock(&local->mtx); 378 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 379 err); 380 return; 381 } 382 383 ieee80211_bss_info_change_notify(sdata, bss_change); 384 385 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 386 mod_timer(&ifibss->timer, 387 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 388 389 bss_meta.chan = chan; 390 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 391 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 392 presp->head_len, GFP_KERNEL); 393 394 cfg80211_put_bss(local->hw.wiphy, bss); 395 netif_carrier_on(sdata->dev); 396 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 397 } 398 399 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 400 struct ieee80211_bss *bss) 401 { 402 struct cfg80211_bss *cbss = 403 container_of((void *)bss, struct cfg80211_bss, priv); 404 struct ieee80211_supported_band *sband; 405 struct cfg80211_chan_def chandef; 406 u32 basic_rates; 407 int i, j; 408 u16 beacon_int = cbss->beacon_interval; 409 const struct cfg80211_bss_ies *ies; 410 enum nl80211_channel_type chan_type; 411 u64 tsf; 412 u32 rate_flags; 413 int shift; 414 415 sdata_assert_lock(sdata); 416 417 if (beacon_int < 10) 418 beacon_int = 10; 419 420 switch (sdata->u.ibss.chandef.width) { 421 case NL80211_CHAN_WIDTH_20_NOHT: 422 case NL80211_CHAN_WIDTH_20: 423 case NL80211_CHAN_WIDTH_40: 424 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 425 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 426 break; 427 case NL80211_CHAN_WIDTH_5: 428 case NL80211_CHAN_WIDTH_10: 429 cfg80211_chandef_create(&chandef, cbss->channel, 430 NL80211_CHAN_NO_HT); 431 chandef.width = sdata->u.ibss.chandef.width; 432 break; 433 case NL80211_CHAN_WIDTH_80: 434 case NL80211_CHAN_WIDTH_80P80: 435 case NL80211_CHAN_WIDTH_160: 436 chandef = sdata->u.ibss.chandef; 437 chandef.chan = cbss->channel; 438 break; 439 default: 440 /* fall back to 20 MHz for unsupported modes */ 441 cfg80211_chandef_create(&chandef, cbss->channel, 442 NL80211_CHAN_NO_HT); 443 break; 444 } 445 446 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 447 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 448 shift = ieee80211_vif_get_shift(&sdata->vif); 449 450 basic_rates = 0; 451 452 for (i = 0; i < bss->supp_rates_len; i++) { 453 int rate = bss->supp_rates[i] & 0x7f; 454 bool is_basic = !!(bss->supp_rates[i] & 0x80); 455 456 for (j = 0; j < sband->n_bitrates; j++) { 457 int brate; 458 if ((rate_flags & sband->bitrates[j].flags) 459 != rate_flags) 460 continue; 461 462 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 463 5 * (1 << shift)); 464 if (brate == rate) { 465 if (is_basic) 466 basic_rates |= BIT(j); 467 break; 468 } 469 } 470 } 471 472 rcu_read_lock(); 473 ies = rcu_dereference(cbss->ies); 474 tsf = ies->tsf; 475 rcu_read_unlock(); 476 477 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 478 beacon_int, 479 &chandef, 480 basic_rates, 481 cbss->capability, 482 tsf, false); 483 } 484 485 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 486 struct cfg80211_csa_settings *csa_settings) 487 { 488 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 489 struct beacon_data *presp, *old_presp; 490 struct cfg80211_bss *cbss; 491 const struct cfg80211_bss_ies *ies; 492 u16 capability = WLAN_CAPABILITY_IBSS; 493 u64 tsf; 494 int ret = 0; 495 496 sdata_assert_lock(sdata); 497 498 if (ifibss->privacy) 499 capability |= WLAN_CAPABILITY_PRIVACY; 500 501 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 502 ifibss->bssid, ifibss->ssid, 503 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 504 IEEE80211_PRIVACY(ifibss->privacy)); 505 506 if (WARN_ON(!cbss)) { 507 ret = -EINVAL; 508 goto out; 509 } 510 511 rcu_read_lock(); 512 ies = rcu_dereference(cbss->ies); 513 tsf = ies->tsf; 514 rcu_read_unlock(); 515 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 516 517 old_presp = rcu_dereference_protected(ifibss->presp, 518 lockdep_is_held(&sdata->wdev.mtx)); 519 520 presp = ieee80211_ibss_build_presp(sdata, 521 sdata->vif.bss_conf.beacon_int, 522 sdata->vif.bss_conf.basic_rates, 523 capability, tsf, &ifibss->chandef, 524 NULL, csa_settings); 525 if (!presp) { 526 ret = -ENOMEM; 527 goto out; 528 } 529 530 rcu_assign_pointer(ifibss->presp, presp); 531 if (old_presp) 532 kfree_rcu(old_presp, rcu_head); 533 534 return BSS_CHANGED_BEACON; 535 out: 536 return ret; 537 } 538 539 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 540 { 541 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 542 struct cfg80211_bss *cbss; 543 int err, changed = 0; 544 545 sdata_assert_lock(sdata); 546 547 /* update cfg80211 bss information with the new channel */ 548 if (!is_zero_ether_addr(ifibss->bssid)) { 549 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 550 ifibss->chandef.chan, 551 ifibss->bssid, ifibss->ssid, 552 ifibss->ssid_len, 553 IEEE80211_BSS_TYPE_IBSS, 554 IEEE80211_PRIVACY(ifibss->privacy)); 555 /* XXX: should not really modify cfg80211 data */ 556 if (cbss) { 557 cbss->channel = sdata->csa_chandef.chan; 558 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 559 } 560 } 561 562 ifibss->chandef = sdata->csa_chandef; 563 564 /* generate the beacon */ 565 err = ieee80211_ibss_csa_beacon(sdata, NULL); 566 if (err < 0) 567 return err; 568 569 changed |= err; 570 571 return changed; 572 } 573 574 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 575 { 576 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 577 578 cancel_work_sync(&ifibss->csa_connection_drop_work); 579 } 580 581 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 582 __acquires(RCU) 583 { 584 struct ieee80211_sub_if_data *sdata = sta->sdata; 585 u8 addr[ETH_ALEN]; 586 587 memcpy(addr, sta->sta.addr, ETH_ALEN); 588 589 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 590 591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 592 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 593 /* authorize the station only if the network is not RSN protected. If 594 * not wait for the userspace to authorize it */ 595 if (!sta->sdata->u.ibss.control_port) 596 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 597 598 rate_control_rate_init(sta); 599 600 /* If it fails, maybe we raced another insertion? */ 601 if (sta_info_insert_rcu(sta)) 602 return sta_info_get(sdata, addr); 603 return sta; 604 } 605 606 static struct sta_info * 607 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 608 const u8 *addr, u32 supp_rates) 609 __acquires(RCU) 610 { 611 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 612 struct ieee80211_local *local = sdata->local; 613 struct sta_info *sta; 614 struct ieee80211_chanctx_conf *chanctx_conf; 615 struct ieee80211_supported_band *sband; 616 enum nl80211_bss_scan_width scan_width; 617 int band; 618 619 /* 620 * XXX: Consider removing the least recently used entry and 621 * allow new one to be added. 622 */ 623 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 624 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 625 sdata->name, addr); 626 rcu_read_lock(); 627 return NULL; 628 } 629 630 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 631 rcu_read_lock(); 632 return NULL; 633 } 634 635 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 636 rcu_read_lock(); 637 return NULL; 638 } 639 640 rcu_read_lock(); 641 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 642 if (WARN_ON_ONCE(!chanctx_conf)) 643 return NULL; 644 band = chanctx_conf->def.chan->band; 645 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 646 rcu_read_unlock(); 647 648 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 649 if (!sta) { 650 rcu_read_lock(); 651 return NULL; 652 } 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 unsigned long last_active = ieee80211_sta_last_active(sta); 674 675 if (sta->sdata == sdata && 676 time_is_after_jiffies(last_active + 677 IEEE80211_IBSS_MERGE_INTERVAL)) { 678 active++; 679 break; 680 } 681 } 682 683 rcu_read_unlock(); 684 685 return active; 686 } 687 688 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 689 { 690 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 691 struct ieee80211_local *local = sdata->local; 692 struct cfg80211_bss *cbss; 693 struct beacon_data *presp; 694 struct sta_info *sta; 695 696 if (!is_zero_ether_addr(ifibss->bssid)) { 697 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 698 ifibss->bssid, ifibss->ssid, 699 ifibss->ssid_len, 700 IEEE80211_BSS_TYPE_IBSS, 701 IEEE80211_PRIVACY(ifibss->privacy)); 702 703 if (cbss) { 704 cfg80211_unlink_bss(local->hw.wiphy, cbss); 705 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 706 } 707 } 708 709 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 710 711 sta_info_flush(sdata); 712 713 spin_lock_bh(&ifibss->incomplete_lock); 714 while (!list_empty(&ifibss->incomplete_stations)) { 715 sta = list_first_entry(&ifibss->incomplete_stations, 716 struct sta_info, list); 717 list_del(&sta->list); 718 spin_unlock_bh(&ifibss->incomplete_lock); 719 720 sta_info_free(local, sta); 721 spin_lock_bh(&ifibss->incomplete_lock); 722 } 723 spin_unlock_bh(&ifibss->incomplete_lock); 724 725 netif_carrier_off(sdata->dev); 726 727 sdata->vif.bss_conf.ibss_joined = false; 728 sdata->vif.bss_conf.ibss_creator = false; 729 sdata->vif.bss_conf.enable_beacon = false; 730 sdata->vif.bss_conf.ssid_len = 0; 731 732 /* remove beacon */ 733 presp = rcu_dereference_protected(ifibss->presp, 734 lockdep_is_held(&sdata->wdev.mtx)); 735 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 736 if (presp) 737 kfree_rcu(presp, rcu_head); 738 739 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 740 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 741 BSS_CHANGED_IBSS); 742 drv_leave_ibss(local, sdata); 743 mutex_lock(&local->mtx); 744 ieee80211_vif_release_channel(sdata); 745 mutex_unlock(&local->mtx); 746 } 747 748 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 749 { 750 struct ieee80211_sub_if_data *sdata = 751 container_of(work, struct ieee80211_sub_if_data, 752 u.ibss.csa_connection_drop_work); 753 754 sdata_lock(sdata); 755 756 ieee80211_ibss_disconnect(sdata); 757 synchronize_rcu(); 758 skb_queue_purge(&sdata->skb_queue); 759 760 /* trigger a scan to find another IBSS network to join */ 761 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 762 763 sdata_unlock(sdata); 764 } 765 766 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 767 { 768 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 769 int err; 770 771 /* if the current channel is a DFS channel, mark the channel as 772 * unavailable. 773 */ 774 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 775 &ifibss->chandef, 776 NL80211_IFTYPE_ADHOC); 777 if (err > 0) 778 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 779 GFP_ATOMIC); 780 } 781 782 static bool 783 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 784 struct ieee802_11_elems *elems, 785 bool beacon) 786 { 787 struct cfg80211_csa_settings params; 788 struct ieee80211_csa_ie csa_ie; 789 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 790 enum nl80211_channel_type ch_type; 791 int err; 792 u32 sta_flags; 793 794 sdata_assert_lock(sdata); 795 796 sta_flags = IEEE80211_STA_DISABLE_VHT; 797 switch (ifibss->chandef.width) { 798 case NL80211_CHAN_WIDTH_5: 799 case NL80211_CHAN_WIDTH_10: 800 case NL80211_CHAN_WIDTH_20_NOHT: 801 sta_flags |= IEEE80211_STA_DISABLE_HT; 802 /* fall through */ 803 case NL80211_CHAN_WIDTH_20: 804 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 805 break; 806 default: 807 break; 808 } 809 810 memset(¶ms, 0, sizeof(params)); 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 nl80211_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; 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 sband = local->hw.wiphy->bands[band]; 1007 if (WARN_ON(!sband)) 1008 return; 1009 1010 rcu_read_lock(); 1011 sta = sta_info_get(sdata, mgmt->sa); 1012 1013 if (elems->supp_rates) { 1014 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1015 band, NULL); 1016 if (sta) { 1017 u32 prev_rates; 1018 1019 prev_rates = sta->sta.supp_rates[band]; 1020 /* make sure mandatory rates are always added */ 1021 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1022 if (rx_status->bw == RATE_INFO_BW_5) 1023 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1024 else if (rx_status->bw == RATE_INFO_BW_10) 1025 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1026 1027 sta->sta.supp_rates[band] = supp_rates | 1028 ieee80211_mandatory_rates(sband, scan_width); 1029 if (sta->sta.supp_rates[band] != prev_rates) { 1030 ibss_dbg(sdata, 1031 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1032 sta->sta.addr, prev_rates, 1033 sta->sta.supp_rates[band]); 1034 rates_updated = true; 1035 } 1036 } else { 1037 rcu_read_unlock(); 1038 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1039 mgmt->sa, supp_rates); 1040 } 1041 } 1042 1043 if (sta && !sta->sta.wme && 1044 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { 1045 sta->sta.wme = true; 1046 ieee80211_check_fast_xmit(sta); 1047 } 1048 1049 if (sta && elems->ht_operation && elems->ht_cap_elem && 1050 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1053 /* we both use HT */ 1054 struct ieee80211_ht_cap htcap_ie; 1055 struct cfg80211_chan_def chandef; 1056 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1057 1058 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1059 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1060 1061 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1062 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1063 &htcap_ie, 1064 sta); 1065 1066 if (elems->vht_operation && elems->vht_cap_elem && 1067 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1068 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1069 /* we both use VHT */ 1070 struct ieee80211_vht_cap cap_ie; 1071 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1072 1073 ieee80211_chandef_vht_oper(elems->vht_operation, 1074 &chandef); 1075 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1076 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1077 &cap_ie, sta); 1078 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1079 rates_updated |= true; 1080 } 1081 1082 if (bw != sta->sta.bandwidth) 1083 rates_updated |= true; 1084 1085 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1086 &chandef)) 1087 WARN_ON_ONCE(1); 1088 } 1089 1090 if (sta && rates_updated) { 1091 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1092 u8 rx_nss = sta->sta.rx_nss; 1093 1094 /* Force rx_nss recalculation */ 1095 sta->sta.rx_nss = 0; 1096 rate_control_rate_init(sta); 1097 if (sta->sta.rx_nss != rx_nss) 1098 changed |= IEEE80211_RC_NSS_CHANGED; 1099 1100 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1101 } 1102 1103 rcu_read_unlock(); 1104 } 1105 1106 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1107 struct ieee80211_mgmt *mgmt, size_t len, 1108 struct ieee80211_rx_status *rx_status, 1109 struct ieee802_11_elems *elems) 1110 { 1111 struct ieee80211_local *local = sdata->local; 1112 struct cfg80211_bss *cbss; 1113 struct ieee80211_bss *bss; 1114 struct ieee80211_channel *channel; 1115 u64 beacon_timestamp, rx_timestamp; 1116 u32 supp_rates = 0; 1117 enum nl80211_band band = rx_status->band; 1118 1119 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1120 if (!channel) 1121 return; 1122 1123 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1124 1125 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1126 channel); 1127 if (!bss) 1128 return; 1129 1130 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1131 1132 /* same for beacon and probe response */ 1133 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1134 1135 /* check if we need to merge IBSS */ 1136 1137 /* not an IBSS */ 1138 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1139 goto put_bss; 1140 1141 /* different channel */ 1142 if (sdata->u.ibss.fixed_channel && 1143 sdata->u.ibss.chandef.chan != cbss->channel) 1144 goto put_bss; 1145 1146 /* different SSID */ 1147 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1148 memcmp(elems->ssid, sdata->u.ibss.ssid, 1149 sdata->u.ibss.ssid_len)) 1150 goto put_bss; 1151 1152 /* process channel switch */ 1153 if (sdata->vif.csa_active || 1154 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1155 goto put_bss; 1156 1157 /* same BSSID */ 1158 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1159 goto put_bss; 1160 1161 /* we use a fixed BSSID */ 1162 if (sdata->u.ibss.fixed_bssid) 1163 goto put_bss; 1164 1165 if (ieee80211_have_rx_timestamp(rx_status)) { 1166 /* time when timestamp field was received */ 1167 rx_timestamp = 1168 ieee80211_calculate_rx_timestamp(local, rx_status, 1169 len + FCS_LEN, 24); 1170 } else { 1171 /* 1172 * second best option: get current TSF 1173 * (will return -1 if not supported) 1174 */ 1175 rx_timestamp = drv_get_tsf(local, sdata); 1176 } 1177 1178 ibss_dbg(sdata, 1179 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1180 mgmt->sa, mgmt->bssid, 1181 (unsigned long long)rx_timestamp, 1182 (unsigned long long)beacon_timestamp, 1183 (unsigned long long)(rx_timestamp - beacon_timestamp), 1184 jiffies); 1185 1186 if (beacon_timestamp > rx_timestamp) { 1187 ibss_dbg(sdata, 1188 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1189 mgmt->bssid); 1190 ieee80211_sta_join_ibss(sdata, bss); 1191 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1192 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1193 supp_rates); 1194 rcu_read_unlock(); 1195 } 1196 1197 put_bss: 1198 ieee80211_rx_bss_put(local, bss); 1199 } 1200 1201 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1202 const u8 *bssid, const u8 *addr, 1203 u32 supp_rates) 1204 { 1205 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1206 struct ieee80211_local *local = sdata->local; 1207 struct sta_info *sta; 1208 struct ieee80211_chanctx_conf *chanctx_conf; 1209 struct ieee80211_supported_band *sband; 1210 enum nl80211_bss_scan_width scan_width; 1211 int band; 1212 1213 /* 1214 * XXX: Consider removing the least recently used entry and 1215 * allow new one to be added. 1216 */ 1217 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1218 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1219 sdata->name, addr); 1220 return; 1221 } 1222 1223 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1224 return; 1225 1226 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1227 return; 1228 1229 rcu_read_lock(); 1230 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1231 if (WARN_ON_ONCE(!chanctx_conf)) { 1232 rcu_read_unlock(); 1233 return; 1234 } 1235 band = chanctx_conf->def.chan->band; 1236 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1237 rcu_read_unlock(); 1238 1239 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1240 if (!sta) 1241 return; 1242 1243 /* make sure mandatory rates are always added */ 1244 sband = local->hw.wiphy->bands[band]; 1245 sta->sta.supp_rates[band] = supp_rates | 1246 ieee80211_mandatory_rates(sband, scan_width); 1247 1248 spin_lock(&ifibss->incomplete_lock); 1249 list_add(&sta->list, &ifibss->incomplete_stations); 1250 spin_unlock(&ifibss->incomplete_lock); 1251 ieee80211_queue_work(&local->hw, &sdata->work); 1252 } 1253 1254 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1255 { 1256 struct ieee80211_local *local = sdata->local; 1257 struct sta_info *sta, *tmp; 1258 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1259 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1260 1261 mutex_lock(&local->sta_mtx); 1262 1263 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1264 unsigned long last_active = ieee80211_sta_last_active(sta); 1265 1266 if (sdata != sta->sdata) 1267 continue; 1268 1269 if (time_is_before_jiffies(last_active + exp_time) || 1270 (time_is_before_jiffies(last_active + exp_rsn) && 1271 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1272 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1273 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1274 "not authorized " : "", sta->sta.addr); 1275 1276 WARN_ON(__sta_info_destroy(sta)); 1277 } 1278 } 1279 1280 mutex_unlock(&local->sta_mtx); 1281 } 1282 1283 /* 1284 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1285 */ 1286 1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1288 { 1289 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1290 enum nl80211_bss_scan_width scan_width; 1291 1292 sdata_assert_lock(sdata); 1293 1294 mod_timer(&ifibss->timer, 1295 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1296 1297 ieee80211_ibss_sta_expire(sdata); 1298 1299 if (time_before(jiffies, ifibss->last_scan_completed + 1300 IEEE80211_IBSS_MERGE_INTERVAL)) 1301 return; 1302 1303 if (ieee80211_sta_active_ibss(sdata)) 1304 return; 1305 1306 if (ifibss->fixed_channel) 1307 return; 1308 1309 sdata_info(sdata, 1310 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1311 1312 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1313 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1314 NULL, 0, scan_width); 1315 } 1316 1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1318 { 1319 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1320 u8 bssid[ETH_ALEN]; 1321 u16 capability; 1322 int i; 1323 1324 sdata_assert_lock(sdata); 1325 1326 if (ifibss->fixed_bssid) { 1327 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1328 } else { 1329 /* Generate random, not broadcast, locally administered BSSID. Mix in 1330 * own MAC address to make sure that devices that do not have proper 1331 * random number generator get different BSSID. */ 1332 get_random_bytes(bssid, ETH_ALEN); 1333 for (i = 0; i < ETH_ALEN; i++) 1334 bssid[i] ^= sdata->vif.addr[i]; 1335 bssid[0] &= ~0x01; 1336 bssid[0] |= 0x02; 1337 } 1338 1339 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1340 1341 capability = WLAN_CAPABILITY_IBSS; 1342 1343 if (ifibss->privacy) 1344 capability |= WLAN_CAPABILITY_PRIVACY; 1345 1346 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1347 &ifibss->chandef, ifibss->basic_rates, 1348 capability, 0, true); 1349 } 1350 1351 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1352 struct ieee80211_channel **channels, 1353 unsigned int channels_max, 1354 u32 center_freq, u32 width) 1355 { 1356 struct ieee80211_channel *chan = NULL; 1357 unsigned int n_chan = 0; 1358 u32 start_freq, end_freq, freq; 1359 1360 if (width <= 20) { 1361 start_freq = center_freq; 1362 end_freq = center_freq; 1363 } else { 1364 start_freq = center_freq - width / 2 + 10; 1365 end_freq = center_freq + width / 2 - 10; 1366 } 1367 1368 for (freq = start_freq; freq <= end_freq; freq += 20) { 1369 chan = ieee80211_get_channel(wiphy, freq); 1370 if (!chan) 1371 continue; 1372 if (n_chan >= channels_max) 1373 return n_chan; 1374 1375 channels[n_chan] = chan; 1376 n_chan++; 1377 } 1378 1379 return n_chan; 1380 } 1381 1382 static unsigned int 1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1384 const struct cfg80211_chan_def *chandef, 1385 struct ieee80211_channel **channels, 1386 unsigned int channels_max) 1387 { 1388 unsigned int n_chan = 0; 1389 u32 width, cf1, cf2 = 0; 1390 1391 switch (chandef->width) { 1392 case NL80211_CHAN_WIDTH_40: 1393 width = 40; 1394 break; 1395 case NL80211_CHAN_WIDTH_80P80: 1396 cf2 = chandef->center_freq2; 1397 /* fall through */ 1398 case NL80211_CHAN_WIDTH_80: 1399 width = 80; 1400 break; 1401 case NL80211_CHAN_WIDTH_160: 1402 width = 160; 1403 break; 1404 default: 1405 width = 20; 1406 break; 1407 } 1408 1409 cf1 = chandef->center_freq1; 1410 1411 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1412 1413 if (cf2) 1414 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1415 channels_max - n_chan, cf2, 1416 width); 1417 1418 return n_chan; 1419 } 1420 1421 /* 1422 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1423 */ 1424 1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1426 { 1427 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1428 struct ieee80211_local *local = sdata->local; 1429 struct cfg80211_bss *cbss; 1430 struct ieee80211_channel *chan = NULL; 1431 const u8 *bssid = NULL; 1432 enum nl80211_bss_scan_width scan_width; 1433 int active_ibss; 1434 1435 sdata_assert_lock(sdata); 1436 1437 active_ibss = ieee80211_sta_active_ibss(sdata); 1438 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1439 1440 if (active_ibss) 1441 return; 1442 1443 if (ifibss->fixed_bssid) 1444 bssid = ifibss->bssid; 1445 if (ifibss->fixed_channel) 1446 chan = ifibss->chandef.chan; 1447 if (!is_zero_ether_addr(ifibss->bssid)) 1448 bssid = ifibss->bssid; 1449 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1450 ifibss->ssid, ifibss->ssid_len, 1451 IEEE80211_BSS_TYPE_IBSS, 1452 IEEE80211_PRIVACY(ifibss->privacy)); 1453 1454 if (cbss) { 1455 struct ieee80211_bss *bss; 1456 1457 bss = (void *)cbss->priv; 1458 ibss_dbg(sdata, 1459 "sta_find_ibss: selected %pM current %pM\n", 1460 cbss->bssid, ifibss->bssid); 1461 sdata_info(sdata, 1462 "Selected IBSS BSSID %pM based on configured SSID\n", 1463 cbss->bssid); 1464 1465 ieee80211_sta_join_ibss(sdata, bss); 1466 ieee80211_rx_bss_put(local, bss); 1467 return; 1468 } 1469 1470 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1471 * directly and do not waste time scanning 1472 */ 1473 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1474 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1475 bssid); 1476 ieee80211_sta_create_ibss(sdata); 1477 return; 1478 } 1479 1480 1481 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1482 1483 /* Selected IBSS not found in current scan results - try to scan */ 1484 if (time_after(jiffies, ifibss->last_scan_completed + 1485 IEEE80211_SCAN_INTERVAL)) { 1486 struct ieee80211_channel *channels[8]; 1487 unsigned int num; 1488 1489 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1490 1491 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1492 1493 if (ifibss->fixed_channel) { 1494 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1495 &ifibss->chandef, 1496 channels, 1497 ARRAY_SIZE(channels)); 1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1499 ifibss->ssid_len, channels, 1500 num, scan_width); 1501 } else { 1502 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1503 ifibss->ssid_len, NULL, 1504 0, scan_width); 1505 } 1506 } else { 1507 int interval = IEEE80211_SCAN_INTERVAL; 1508 1509 if (time_after(jiffies, ifibss->ibss_join_req + 1510 IEEE80211_IBSS_JOIN_TIMEOUT)) 1511 ieee80211_sta_create_ibss(sdata); 1512 1513 mod_timer(&ifibss->timer, 1514 round_jiffies(jiffies + interval)); 1515 } 1516 } 1517 1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1519 struct sk_buff *req) 1520 { 1521 struct ieee80211_mgmt *mgmt = (void *)req->data; 1522 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1523 struct ieee80211_local *local = sdata->local; 1524 int tx_last_beacon, len = req->len; 1525 struct sk_buff *skb; 1526 struct beacon_data *presp; 1527 u8 *pos, *end; 1528 1529 sdata_assert_lock(sdata); 1530 1531 presp = rcu_dereference_protected(ifibss->presp, 1532 lockdep_is_held(&sdata->wdev.mtx)); 1533 1534 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1535 len < 24 + 2 || !presp) 1536 return; 1537 1538 tx_last_beacon = drv_tx_last_beacon(local); 1539 1540 ibss_dbg(sdata, 1541 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1542 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1543 1544 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1545 return; 1546 1547 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1548 !is_broadcast_ether_addr(mgmt->bssid)) 1549 return; 1550 1551 end = ((u8 *) mgmt) + len; 1552 pos = mgmt->u.probe_req.variable; 1553 if (pos[0] != WLAN_EID_SSID || 1554 pos + 2 + pos[1] > end) { 1555 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1556 mgmt->sa); 1557 return; 1558 } 1559 if (pos[1] != 0 && 1560 (pos[1] != ifibss->ssid_len || 1561 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1562 /* Ignore ProbeReq for foreign SSID */ 1563 return; 1564 } 1565 1566 /* Reply with ProbeResp */ 1567 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1568 if (!skb) 1569 return; 1570 1571 skb_reserve(skb, local->tx_headroom); 1572 skb_put_data(skb, presp->head, presp->head_len); 1573 1574 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1575 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1577 1578 /* avoid excessive retries for probe request to wildcard SSIDs */ 1579 if (pos[1] == 0) 1580 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1581 1582 ieee80211_tx_skb(sdata, skb); 1583 } 1584 1585 static 1586 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1587 struct ieee80211_mgmt *mgmt, size_t len, 1588 struct ieee80211_rx_status *rx_status) 1589 { 1590 size_t baselen; 1591 struct ieee802_11_elems elems; 1592 1593 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1594 offsetof(typeof(mgmt->u.beacon), variable)); 1595 1596 /* 1597 * either beacon or probe_resp but the variable field is at the 1598 * same offset 1599 */ 1600 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1601 if (baselen > len) 1602 return; 1603 1604 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1605 false, &elems); 1606 1607 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1608 } 1609 1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1611 struct sk_buff *skb) 1612 { 1613 struct ieee80211_rx_status *rx_status; 1614 struct ieee80211_mgmt *mgmt; 1615 u16 fc; 1616 struct ieee802_11_elems elems; 1617 int ies_len; 1618 1619 rx_status = IEEE80211_SKB_RXCB(skb); 1620 mgmt = (struct ieee80211_mgmt *) skb->data; 1621 fc = le16_to_cpu(mgmt->frame_control); 1622 1623 sdata_lock(sdata); 1624 1625 if (!sdata->u.ibss.ssid_len) 1626 goto mgmt_out; /* not ready to merge yet */ 1627 1628 switch (fc & IEEE80211_FCTL_STYPE) { 1629 case IEEE80211_STYPE_PROBE_REQ: 1630 ieee80211_rx_mgmt_probe_req(sdata, skb); 1631 break; 1632 case IEEE80211_STYPE_PROBE_RESP: 1633 case IEEE80211_STYPE_BEACON: 1634 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1635 rx_status); 1636 break; 1637 case IEEE80211_STYPE_AUTH: 1638 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1639 break; 1640 case IEEE80211_STYPE_DEAUTH: 1641 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1642 break; 1643 case IEEE80211_STYPE_ACTION: 1644 switch (mgmt->u.action.category) { 1645 case WLAN_CATEGORY_SPECTRUM_MGMT: 1646 ies_len = skb->len - 1647 offsetof(struct ieee80211_mgmt, 1648 u.action.u.chan_switch.variable); 1649 1650 if (ies_len < 0) 1651 break; 1652 1653 ieee802_11_parse_elems( 1654 mgmt->u.action.u.chan_switch.variable, 1655 ies_len, true, &elems); 1656 1657 if (elems.parse_error) 1658 break; 1659 1660 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1661 rx_status, &elems); 1662 break; 1663 } 1664 } 1665 1666 mgmt_out: 1667 sdata_unlock(sdata); 1668 } 1669 1670 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1671 { 1672 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1673 struct sta_info *sta; 1674 1675 sdata_lock(sdata); 1676 1677 /* 1678 * Work could be scheduled after scan or similar 1679 * when we aren't even joined (or trying) with a 1680 * network. 1681 */ 1682 if (!ifibss->ssid_len) 1683 goto out; 1684 1685 spin_lock_bh(&ifibss->incomplete_lock); 1686 while (!list_empty(&ifibss->incomplete_stations)) { 1687 sta = list_first_entry(&ifibss->incomplete_stations, 1688 struct sta_info, list); 1689 list_del(&sta->list); 1690 spin_unlock_bh(&ifibss->incomplete_lock); 1691 1692 ieee80211_ibss_finish_sta(sta); 1693 rcu_read_unlock(); 1694 spin_lock_bh(&ifibss->incomplete_lock); 1695 } 1696 spin_unlock_bh(&ifibss->incomplete_lock); 1697 1698 switch (ifibss->state) { 1699 case IEEE80211_IBSS_MLME_SEARCH: 1700 ieee80211_sta_find_ibss(sdata); 1701 break; 1702 case IEEE80211_IBSS_MLME_JOINED: 1703 ieee80211_sta_merge_ibss(sdata); 1704 break; 1705 default: 1706 WARN_ON(1); 1707 break; 1708 } 1709 1710 out: 1711 sdata_unlock(sdata); 1712 } 1713 1714 static void ieee80211_ibss_timer(unsigned long data) 1715 { 1716 struct ieee80211_sub_if_data *sdata = 1717 (struct ieee80211_sub_if_data *) data; 1718 1719 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1720 } 1721 1722 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1723 { 1724 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1725 1726 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1727 (unsigned long) sdata); 1728 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1729 spin_lock_init(&ifibss->incomplete_lock); 1730 INIT_WORK(&ifibss->csa_connection_drop_work, 1731 ieee80211_csa_connection_drop_work); 1732 } 1733 1734 /* scan finished notification */ 1735 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1736 { 1737 struct ieee80211_sub_if_data *sdata; 1738 1739 mutex_lock(&local->iflist_mtx); 1740 list_for_each_entry(sdata, &local->interfaces, list) { 1741 if (!ieee80211_sdata_running(sdata)) 1742 continue; 1743 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1744 continue; 1745 sdata->u.ibss.last_scan_completed = jiffies; 1746 } 1747 mutex_unlock(&local->iflist_mtx); 1748 } 1749 1750 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1751 struct cfg80211_ibss_params *params) 1752 { 1753 u32 changed = 0; 1754 u32 rate_flags; 1755 struct ieee80211_supported_band *sband; 1756 enum ieee80211_chanctx_mode chanmode; 1757 struct ieee80211_local *local = sdata->local; 1758 int radar_detect_width = 0; 1759 int i; 1760 int ret; 1761 1762 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1763 ¶ms->chandef, 1764 sdata->wdev.iftype); 1765 if (ret < 0) 1766 return ret; 1767 1768 if (ret > 0) { 1769 if (!params->userspace_handles_dfs) 1770 return -EINVAL; 1771 radar_detect_width = BIT(params->chandef.width); 1772 } 1773 1774 chanmode = (params->channel_fixed && !ret) ? 1775 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1776 1777 mutex_lock(&local->chanctx_mtx); 1778 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1779 radar_detect_width); 1780 mutex_unlock(&local->chanctx_mtx); 1781 if (ret < 0) 1782 return ret; 1783 1784 if (params->bssid) { 1785 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1786 sdata->u.ibss.fixed_bssid = true; 1787 } else 1788 sdata->u.ibss.fixed_bssid = false; 1789 1790 sdata->u.ibss.privacy = params->privacy; 1791 sdata->u.ibss.control_port = params->control_port; 1792 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1793 sdata->u.ibss.basic_rates = params->basic_rates; 1794 sdata->u.ibss.last_scan_completed = jiffies; 1795 1796 /* fix basic_rates if channel does not support these rates */ 1797 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1798 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1799 for (i = 0; i < sband->n_bitrates; i++) { 1800 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1801 sdata->u.ibss.basic_rates &= ~BIT(i); 1802 } 1803 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1804 sizeof(params->mcast_rate)); 1805 1806 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1807 1808 sdata->u.ibss.chandef = params->chandef; 1809 sdata->u.ibss.fixed_channel = params->channel_fixed; 1810 1811 if (params->ie) { 1812 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1813 GFP_KERNEL); 1814 if (sdata->u.ibss.ie) 1815 sdata->u.ibss.ie_len = params->ie_len; 1816 } 1817 1818 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1819 sdata->u.ibss.ibss_join_req = jiffies; 1820 1821 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1822 sdata->u.ibss.ssid_len = params->ssid_len; 1823 1824 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1825 sizeof(sdata->u.ibss.ht_capa)); 1826 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1827 sizeof(sdata->u.ibss.ht_capa_mask)); 1828 1829 /* 1830 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1831 * reserved, but an HT STA shall protect HT transmissions as though 1832 * the HT Protection field were set to non-HT mixed mode. 1833 * 1834 * In an IBSS, the RIFS Mode field of the HT Operation element is 1835 * also reserved, but an HT STA shall operate as though this field 1836 * were set to 1. 1837 */ 1838 1839 sdata->vif.bss_conf.ht_operation_mode |= 1840 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1841 | IEEE80211_HT_PARAM_RIFS_MODE; 1842 1843 changed |= BSS_CHANGED_HT; 1844 ieee80211_bss_info_change_notify(sdata, changed); 1845 1846 sdata->smps_mode = IEEE80211_SMPS_OFF; 1847 sdata->needed_rx_chains = local->rx_chains; 1848 1849 ieee80211_queue_work(&local->hw, &sdata->work); 1850 1851 return 0; 1852 } 1853 1854 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1855 { 1856 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1857 1858 ieee80211_ibss_disconnect(sdata); 1859 ifibss->ssid_len = 0; 1860 eth_zero_addr(ifibss->bssid); 1861 1862 /* remove beacon */ 1863 kfree(sdata->u.ibss.ie); 1864 1865 /* on the next join, re-program HT parameters */ 1866 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1867 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1868 1869 synchronize_rcu(); 1870 1871 skb_queue_purge(&sdata->skb_queue); 1872 1873 del_timer_sync(&sdata->u.ibss.timer); 1874 1875 return 0; 1876 } 1877