1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IBSS mode implementation 4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 5 * Copyright 2004, Instant802 Networks, Inc. 6 * Copyright 2005, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 10 * Copyright 2013-2014 Intel Mobile Communications GmbH 11 * Copyright(c) 2016 Intel Deutschland GmbH 12 * Copyright(c) 2018-2019 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rate_flags, rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->csa_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->csa_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224 { 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.bss_conf.ibss_joined) { 248 sdata->vif.bss_conf.ibss_joined = false; 249 sdata->vif.bss_conf.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = rcu_dereference_protected(ifibss->presp, 259 lockdep_is_held(&sdata->wdev.mtx)); 260 RCU_INIT_POINTER(ifibss->presp, NULL); 261 if (presp) 262 kfree_rcu(presp, rcu_head); 263 264 /* make a copy of the chandef, it could be modified below. */ 265 chandef = *req_chandef; 266 chan = chandef.chan; 267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 268 NL80211_IFTYPE_ADHOC)) { 269 if (chandef.width == NL80211_CHAN_WIDTH_5 || 270 chandef.width == NL80211_CHAN_WIDTH_10 || 271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 272 chandef.width == NL80211_CHAN_WIDTH_20) { 273 sdata_info(sdata, 274 "Failed to join IBSS, beacons forbidden\n"); 275 return; 276 } 277 chandef.width = NL80211_CHAN_WIDTH_20; 278 chandef.center_freq1 = chan->center_freq; 279 /* check again for downgraded chandef */ 280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 281 NL80211_IFTYPE_ADHOC)) { 282 sdata_info(sdata, 283 "Failed to join IBSS, beacons forbidden\n"); 284 return; 285 } 286 } 287 288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 289 &chandef, NL80211_IFTYPE_ADHOC); 290 if (err < 0) { 291 sdata_info(sdata, 292 "Failed to join IBSS, invalid chandef\n"); 293 return; 294 } 295 if (err > 0 && !ifibss->userspace_handles_dfs) { 296 sdata_info(sdata, 297 "Failed to join IBSS, DFS channel without control program\n"); 298 return; 299 } 300 301 radar_required = err; 302 303 mutex_lock(&local->mtx); 304 if (ieee80211_vif_use_channel(sdata, &chandef, 305 ifibss->fixed_channel ? 306 IEEE80211_CHANCTX_SHARED : 307 IEEE80211_CHANCTX_EXCLUSIVE)) { 308 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 309 mutex_unlock(&local->mtx); 310 return; 311 } 312 sdata->radar_required = radar_required; 313 mutex_unlock(&local->mtx); 314 315 memcpy(ifibss->bssid, bssid, ETH_ALEN); 316 317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 318 capability, tsf, &chandef, 319 &have_higher_than_11mbit, NULL); 320 if (!presp) 321 return; 322 323 rcu_assign_pointer(ifibss->presp, presp); 324 mgmt = (void *)presp->head; 325 326 sdata->vif.bss_conf.enable_beacon = true; 327 sdata->vif.bss_conf.beacon_int = beacon_int; 328 sdata->vif.bss_conf.basic_rates = basic_rates; 329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 331 bss_change = BSS_CHANGED_BEACON_INT; 332 bss_change |= ieee80211_reset_erp_info(sdata); 333 bss_change |= BSS_CHANGED_BSSID; 334 bss_change |= BSS_CHANGED_BEACON; 335 bss_change |= BSS_CHANGED_BEACON_ENABLED; 336 bss_change |= BSS_CHANGED_BASIC_RATES; 337 bss_change |= BSS_CHANGED_HT; 338 bss_change |= BSS_CHANGED_IBSS; 339 bss_change |= BSS_CHANGED_SSID; 340 341 /* 342 * In 5 GHz/802.11a, we can always use short slot time. 343 * (IEEE 802.11-2012 18.3.8.7) 344 * 345 * In 2.4GHz, we must always use long slots in IBSS for compatibility 346 * reasons. 347 * (IEEE 802.11-2012 19.4.5) 348 * 349 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 350 */ 351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395 } 396 397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 398 struct ieee80211_bss *bss) 399 { 400 struct cfg80211_bss *cbss = 401 container_of((void *)bss, struct cfg80211_bss, priv); 402 struct ieee80211_supported_band *sband; 403 struct cfg80211_chan_def chandef; 404 u32 basic_rates; 405 int i, j; 406 u16 beacon_int = cbss->beacon_interval; 407 const struct cfg80211_bss_ies *ies; 408 enum nl80211_channel_type chan_type; 409 u64 tsf; 410 u32 rate_flags; 411 int shift; 412 413 sdata_assert_lock(sdata); 414 415 if (beacon_int < 10) 416 beacon_int = 10; 417 418 switch (sdata->u.ibss.chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 case NL80211_CHAN_WIDTH_40: 422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 424 break; 425 case NL80211_CHAN_WIDTH_5: 426 case NL80211_CHAN_WIDTH_10: 427 cfg80211_chandef_create(&chandef, cbss->channel, 428 NL80211_CHAN_NO_HT); 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_NO_HT); 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 = WLAN_CAPABILITY_IBSS; 491 u64 tsf; 492 int ret = 0; 493 494 sdata_assert_lock(sdata); 495 496 if (ifibss->privacy) 497 capability |= WLAN_CAPABILITY_PRIVACY; 498 499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 500 ifibss->bssid, ifibss->ssid, 501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 502 IEEE80211_PRIVACY(ifibss->privacy)); 503 504 if (WARN_ON(!cbss)) { 505 ret = -EINVAL; 506 goto out; 507 } 508 509 rcu_read_lock(); 510 ies = rcu_dereference(cbss->ies); 511 tsf = ies->tsf; 512 rcu_read_unlock(); 513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 514 515 old_presp = rcu_dereference_protected(ifibss->presp, 516 lockdep_is_held(&sdata->wdev.mtx)); 517 518 presp = ieee80211_ibss_build_presp(sdata, 519 sdata->vif.bss_conf.beacon_int, 520 sdata->vif.bss_conf.basic_rates, 521 capability, tsf, &ifibss->chandef, 522 NULL, csa_settings); 523 if (!presp) { 524 ret = -ENOMEM; 525 goto out; 526 } 527 528 rcu_assign_pointer(ifibss->presp, presp); 529 if (old_presp) 530 kfree_rcu(old_presp, rcu_head); 531 532 return BSS_CHANGED_BEACON; 533 out: 534 return ret; 535 } 536 537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 538 { 539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 540 struct cfg80211_bss *cbss; 541 int err, changed = 0; 542 543 sdata_assert_lock(sdata); 544 545 /* update cfg80211 bss information with the new channel */ 546 if (!is_zero_ether_addr(ifibss->bssid)) { 547 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 548 ifibss->chandef.chan, 549 ifibss->bssid, ifibss->ssid, 550 ifibss->ssid_len, 551 IEEE80211_BSS_TYPE_IBSS, 552 IEEE80211_PRIVACY(ifibss->privacy)); 553 /* XXX: should not really modify cfg80211 data */ 554 if (cbss) { 555 cbss->channel = sdata->csa_chandef.chan; 556 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 557 } 558 } 559 560 ifibss->chandef = sdata->csa_chandef; 561 562 /* generate the beacon */ 563 err = ieee80211_ibss_csa_beacon(sdata, NULL); 564 if (err < 0) 565 return err; 566 567 changed |= err; 568 569 return changed; 570 } 571 572 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 573 { 574 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 575 576 cancel_work_sync(&ifibss->csa_connection_drop_work); 577 } 578 579 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 580 __acquires(RCU) 581 { 582 struct ieee80211_sub_if_data *sdata = sta->sdata; 583 u8 addr[ETH_ALEN]; 584 585 memcpy(addr, sta->sta.addr, ETH_ALEN); 586 587 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 588 589 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 590 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 591 /* authorize the station only if the network is not RSN protected. If 592 * not wait for the userspace to authorize it */ 593 if (!sta->sdata->u.ibss.control_port) 594 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 595 596 rate_control_rate_init(sta); 597 598 /* If it fails, maybe we raced another insertion? */ 599 if (sta_info_insert_rcu(sta)) 600 return sta_info_get(sdata, addr); 601 return sta; 602 } 603 604 static struct sta_info * 605 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 606 const u8 *addr, u32 supp_rates) 607 __acquires(RCU) 608 { 609 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 610 struct ieee80211_local *local = sdata->local; 611 struct sta_info *sta; 612 struct ieee80211_chanctx_conf *chanctx_conf; 613 struct ieee80211_supported_band *sband; 614 enum nl80211_bss_scan_width scan_width; 615 int band; 616 617 /* 618 * XXX: Consider removing the least recently used entry and 619 * allow new one to be added. 620 */ 621 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 622 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 623 sdata->name, addr); 624 rcu_read_lock(); 625 return NULL; 626 } 627 628 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 629 rcu_read_lock(); 630 return NULL; 631 } 632 633 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 634 rcu_read_lock(); 635 return NULL; 636 } 637 638 rcu_read_lock(); 639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 640 if (WARN_ON_ONCE(!chanctx_conf)) 641 return NULL; 642 band = chanctx_conf->def.chan->band; 643 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 644 rcu_read_unlock(); 645 646 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 647 if (!sta) { 648 rcu_read_lock(); 649 return NULL; 650 } 651 652 /* make sure mandatory rates are always added */ 653 sband = local->hw.wiphy->bands[band]; 654 sta->sta.supp_rates[band] = supp_rates | 655 ieee80211_mandatory_rates(sband, scan_width); 656 657 return ieee80211_ibss_finish_sta(sta); 658 } 659 660 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 661 { 662 struct ieee80211_local *local = sdata->local; 663 int active = 0; 664 struct sta_info *sta; 665 666 sdata_assert_lock(sdata); 667 668 rcu_read_lock(); 669 670 list_for_each_entry_rcu(sta, &local->sta_list, list) { 671 unsigned long last_active = ieee80211_sta_last_active(sta); 672 673 if (sta->sdata == sdata && 674 time_is_after_jiffies(last_active + 675 IEEE80211_IBSS_MERGE_INTERVAL)) { 676 active++; 677 break; 678 } 679 } 680 681 rcu_read_unlock(); 682 683 return active; 684 } 685 686 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 687 { 688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 689 struct ieee80211_local *local = sdata->local; 690 struct cfg80211_bss *cbss; 691 struct beacon_data *presp; 692 struct sta_info *sta; 693 694 if (!is_zero_ether_addr(ifibss->bssid)) { 695 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 696 ifibss->bssid, ifibss->ssid, 697 ifibss->ssid_len, 698 IEEE80211_BSS_TYPE_IBSS, 699 IEEE80211_PRIVACY(ifibss->privacy)); 700 701 if (cbss) { 702 cfg80211_unlink_bss(local->hw.wiphy, cbss); 703 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 704 } 705 } 706 707 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 708 709 sta_info_flush(sdata); 710 711 spin_lock_bh(&ifibss->incomplete_lock); 712 while (!list_empty(&ifibss->incomplete_stations)) { 713 sta = list_first_entry(&ifibss->incomplete_stations, 714 struct sta_info, list); 715 list_del(&sta->list); 716 spin_unlock_bh(&ifibss->incomplete_lock); 717 718 sta_info_free(local, sta); 719 spin_lock_bh(&ifibss->incomplete_lock); 720 } 721 spin_unlock_bh(&ifibss->incomplete_lock); 722 723 netif_carrier_off(sdata->dev); 724 725 sdata->vif.bss_conf.ibss_joined = false; 726 sdata->vif.bss_conf.ibss_creator = false; 727 sdata->vif.bss_conf.enable_beacon = false; 728 sdata->vif.bss_conf.ssid_len = 0; 729 730 /* remove beacon */ 731 presp = rcu_dereference_protected(ifibss->presp, 732 lockdep_is_held(&sdata->wdev.mtx)); 733 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 734 if (presp) 735 kfree_rcu(presp, rcu_head); 736 737 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 739 BSS_CHANGED_IBSS); 740 drv_leave_ibss(local, sdata); 741 mutex_lock(&local->mtx); 742 ieee80211_vif_release_channel(sdata); 743 mutex_unlock(&local->mtx); 744 } 745 746 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 747 { 748 struct ieee80211_sub_if_data *sdata = 749 container_of(work, struct ieee80211_sub_if_data, 750 u.ibss.csa_connection_drop_work); 751 752 sdata_lock(sdata); 753 754 ieee80211_ibss_disconnect(sdata); 755 synchronize_rcu(); 756 skb_queue_purge(&sdata->skb_queue); 757 758 /* trigger a scan to find another IBSS network to join */ 759 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 760 761 sdata_unlock(sdata); 762 } 763 764 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 765 { 766 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 767 int err; 768 769 /* if the current channel is a DFS channel, mark the channel as 770 * unavailable. 771 */ 772 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 773 &ifibss->chandef, 774 NL80211_IFTYPE_ADHOC); 775 if (err > 0) 776 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 777 GFP_ATOMIC); 778 } 779 780 static bool 781 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 782 struct ieee802_11_elems *elems, 783 bool beacon) 784 { 785 struct cfg80211_csa_settings params; 786 struct ieee80211_csa_ie csa_ie; 787 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 788 enum nl80211_channel_type ch_type; 789 int err; 790 u32 sta_flags; 791 792 sdata_assert_lock(sdata); 793 794 sta_flags = IEEE80211_STA_DISABLE_VHT; 795 switch (ifibss->chandef.width) { 796 case NL80211_CHAN_WIDTH_5: 797 case NL80211_CHAN_WIDTH_10: 798 case NL80211_CHAN_WIDTH_20_NOHT: 799 sta_flags |= IEEE80211_STA_DISABLE_HT; 800 /* fall through */ 801 case NL80211_CHAN_WIDTH_20: 802 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 803 break; 804 default: 805 break; 806 } 807 808 memset(¶ms, 0, sizeof(params)); 809 err = ieee80211_parse_ch_switch_ie(sdata, elems, 810 ifibss->chandef.chan->band, 811 sta_flags, ifibss->bssid, &csa_ie); 812 /* can't switch to destination channel, fail */ 813 if (err < 0) 814 goto disconnect; 815 816 /* did not contain a CSA */ 817 if (err) 818 return false; 819 820 /* channel switch is not supported, disconnect */ 821 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 822 goto disconnect; 823 824 params.count = csa_ie.count; 825 params.chandef = csa_ie.chandef; 826 827 switch (ifibss->chandef.width) { 828 case NL80211_CHAN_WIDTH_20_NOHT: 829 case NL80211_CHAN_WIDTH_20: 830 case NL80211_CHAN_WIDTH_40: 831 /* keep our current HT mode (HT20/HT40+/HT40-), even if 832 * another mode has been announced. The mode is not adopted 833 * within the beacon while doing CSA and we should therefore 834 * keep the mode which we announce. 835 */ 836 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 837 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 838 ch_type); 839 break; 840 case NL80211_CHAN_WIDTH_5: 841 case NL80211_CHAN_WIDTH_10: 842 if (params.chandef.width != ifibss->chandef.width) { 843 sdata_info(sdata, 844 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 845 ifibss->bssid, 846 params.chandef.chan->center_freq, 847 params.chandef.width, 848 params.chandef.center_freq1, 849 params.chandef.center_freq2); 850 goto disconnect; 851 } 852 break; 853 default: 854 /* should not happen, sta_flags should prevent VHT modes. */ 855 WARN_ON(1); 856 goto disconnect; 857 } 858 859 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 860 NL80211_IFTYPE_ADHOC)) { 861 sdata_info(sdata, 862 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 863 ifibss->bssid, 864 params.chandef.chan->center_freq, 865 params.chandef.width, 866 params.chandef.center_freq1, 867 params.chandef.center_freq2); 868 goto disconnect; 869 } 870 871 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 872 ¶ms.chandef, 873 NL80211_IFTYPE_ADHOC); 874 if (err < 0) 875 goto disconnect; 876 if (err > 0 && !ifibss->userspace_handles_dfs) { 877 /* IBSS-DFS only allowed with a control program */ 878 goto disconnect; 879 } 880 881 params.radar_required = err; 882 883 if (cfg80211_chandef_identical(¶ms.chandef, 884 &sdata->vif.bss_conf.chandef)) { 885 ibss_dbg(sdata, 886 "received csa with an identical chandef, ignoring\n"); 887 return true; 888 } 889 890 /* all checks done, now perform the channel switch. */ 891 ibss_dbg(sdata, 892 "received channel switch announcement to go to channel %d MHz\n", 893 params.chandef.chan->center_freq); 894 895 params.block_tx = !!csa_ie.mode; 896 897 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 898 ¶ms)) 899 goto disconnect; 900 901 ieee80211_ibss_csa_mark_radar(sdata); 902 903 return true; 904 disconnect: 905 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 906 ieee80211_queue_work(&sdata->local->hw, 907 &ifibss->csa_connection_drop_work); 908 909 ieee80211_ibss_csa_mark_radar(sdata); 910 911 return true; 912 } 913 914 static void 915 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 916 struct ieee80211_mgmt *mgmt, size_t len, 917 struct ieee80211_rx_status *rx_status, 918 struct ieee802_11_elems *elems) 919 { 920 int required_len; 921 922 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 923 return; 924 925 /* CSA is the only action we handle for now */ 926 if (mgmt->u.action.u.measurement.action_code != 927 WLAN_ACTION_SPCT_CHL_SWITCH) 928 return; 929 930 required_len = IEEE80211_MIN_ACTION_SIZE + 931 sizeof(mgmt->u.action.u.chan_switch); 932 if (len < required_len) 933 return; 934 935 if (!sdata->vif.csa_active) 936 ieee80211_ibss_process_chanswitch(sdata, elems, false); 937 } 938 939 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 940 struct ieee80211_mgmt *mgmt, 941 size_t len) 942 { 943 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 944 945 if (len < IEEE80211_DEAUTH_FRAME_LEN) 946 return; 947 948 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 949 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 950 sta_info_destroy_addr(sdata, mgmt->sa); 951 } 952 953 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 954 struct ieee80211_mgmt *mgmt, 955 size_t len) 956 { 957 u16 auth_alg, auth_transaction; 958 959 sdata_assert_lock(sdata); 960 961 if (len < 24 + 6) 962 return; 963 964 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 965 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 966 967 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 968 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 969 mgmt->bssid, auth_transaction); 970 971 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 972 return; 973 974 /* 975 * IEEE 802.11 standard does not require authentication in IBSS 976 * networks and most implementations do not seem to use it. 977 * However, try to reply to authentication attempts if someone 978 * has actually implemented this. 979 */ 980 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 981 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 982 } 983 984 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 985 struct ieee80211_mgmt *mgmt, size_t len, 986 struct ieee80211_rx_status *rx_status, 987 struct ieee802_11_elems *elems, 988 struct ieee80211_channel *channel) 989 { 990 struct sta_info *sta; 991 enum nl80211_band band = rx_status->band; 992 enum nl80211_bss_scan_width scan_width; 993 struct ieee80211_local *local = sdata->local; 994 struct ieee80211_supported_band *sband; 995 bool rates_updated = false; 996 u32 supp_rates = 0; 997 998 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 999 return; 1000 1001 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1002 return; 1003 1004 sband = local->hw.wiphy->bands[band]; 1005 if (WARN_ON(!sband)) 1006 return; 1007 1008 rcu_read_lock(); 1009 sta = sta_info_get(sdata, mgmt->sa); 1010 1011 if (elems->supp_rates) { 1012 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1013 band, NULL); 1014 if (sta) { 1015 u32 prev_rates; 1016 1017 prev_rates = sta->sta.supp_rates[band]; 1018 /* make sure mandatory rates are always added */ 1019 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1020 if (rx_status->bw == RATE_INFO_BW_5) 1021 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1022 else if (rx_status->bw == RATE_INFO_BW_10) 1023 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1024 1025 sta->sta.supp_rates[band] = supp_rates | 1026 ieee80211_mandatory_rates(sband, scan_width); 1027 if (sta->sta.supp_rates[band] != prev_rates) { 1028 ibss_dbg(sdata, 1029 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1030 sta->sta.addr, prev_rates, 1031 sta->sta.supp_rates[band]); 1032 rates_updated = true; 1033 } 1034 } else { 1035 rcu_read_unlock(); 1036 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1037 mgmt->sa, supp_rates); 1038 } 1039 } 1040 1041 if (sta && !sta->sta.wme && 1042 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { 1043 sta->sta.wme = true; 1044 ieee80211_check_fast_xmit(sta); 1045 } 1046 1047 if (sta && elems->ht_operation && elems->ht_cap_elem && 1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1049 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1050 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1051 /* we both use HT */ 1052 struct ieee80211_ht_cap htcap_ie; 1053 struct cfg80211_chan_def chandef; 1054 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1055 1056 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1057 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1058 1059 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1060 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1061 &htcap_ie, 1062 sta); 1063 1064 if (elems->vht_operation && elems->vht_cap_elem && 1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1066 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1067 /* we both use VHT */ 1068 struct ieee80211_vht_cap cap_ie; 1069 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1070 1071 ieee80211_chandef_vht_oper(&local->hw, 1072 elems->vht_operation, 1073 elems->ht_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, channel); 1126 if (!bss) 1127 return; 1128 1129 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1130 1131 /* same for beacon and probe response */ 1132 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1133 1134 /* check if we need to merge IBSS */ 1135 1136 /* not an IBSS */ 1137 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1138 goto put_bss; 1139 1140 /* different channel */ 1141 if (sdata->u.ibss.fixed_channel && 1142 sdata->u.ibss.chandef.chan != cbss->channel) 1143 goto put_bss; 1144 1145 /* different SSID */ 1146 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1147 memcmp(elems->ssid, sdata->u.ibss.ssid, 1148 sdata->u.ibss.ssid_len)) 1149 goto put_bss; 1150 1151 /* process channel switch */ 1152 if (sdata->vif.csa_active || 1153 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1154 goto put_bss; 1155 1156 /* same BSSID */ 1157 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1158 goto put_bss; 1159 1160 /* we use a fixed BSSID */ 1161 if (sdata->u.ibss.fixed_bssid) 1162 goto put_bss; 1163 1164 if (ieee80211_have_rx_timestamp(rx_status)) { 1165 /* time when timestamp field was received */ 1166 rx_timestamp = 1167 ieee80211_calculate_rx_timestamp(local, rx_status, 1168 len + FCS_LEN, 24); 1169 } else { 1170 /* 1171 * second best option: get current TSF 1172 * (will return -1 if not supported) 1173 */ 1174 rx_timestamp = drv_get_tsf(local, sdata); 1175 } 1176 1177 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1178 mgmt->sa, mgmt->bssid, 1179 (unsigned long long)rx_timestamp); 1180 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1181 (unsigned long long)beacon_timestamp, 1182 (unsigned long long)(rx_timestamp - beacon_timestamp), 1183 jiffies); 1184 1185 if (beacon_timestamp > rx_timestamp) { 1186 ibss_dbg(sdata, 1187 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1188 mgmt->bssid); 1189 ieee80211_sta_join_ibss(sdata, bss); 1190 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1191 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1192 supp_rates); 1193 rcu_read_unlock(); 1194 } 1195 1196 put_bss: 1197 ieee80211_rx_bss_put(local, bss); 1198 } 1199 1200 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1201 const u8 *bssid, const u8 *addr, 1202 u32 supp_rates) 1203 { 1204 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1205 struct ieee80211_local *local = sdata->local; 1206 struct sta_info *sta; 1207 struct ieee80211_chanctx_conf *chanctx_conf; 1208 struct ieee80211_supported_band *sband; 1209 enum nl80211_bss_scan_width scan_width; 1210 int band; 1211 1212 /* 1213 * XXX: Consider removing the least recently used entry and 1214 * allow new one to be added. 1215 */ 1216 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1217 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1218 sdata->name, addr); 1219 return; 1220 } 1221 1222 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1223 return; 1224 1225 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1226 return; 1227 1228 rcu_read_lock(); 1229 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1230 if (WARN_ON_ONCE(!chanctx_conf)) { 1231 rcu_read_unlock(); 1232 return; 1233 } 1234 band = chanctx_conf->def.chan->band; 1235 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1236 rcu_read_unlock(); 1237 1238 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1239 if (!sta) 1240 return; 1241 1242 /* make sure mandatory rates are always added */ 1243 sband = local->hw.wiphy->bands[band]; 1244 sta->sta.supp_rates[band] = supp_rates | 1245 ieee80211_mandatory_rates(sband, scan_width); 1246 1247 spin_lock(&ifibss->incomplete_lock); 1248 list_add(&sta->list, &ifibss->incomplete_stations); 1249 spin_unlock(&ifibss->incomplete_lock); 1250 ieee80211_queue_work(&local->hw, &sdata->work); 1251 } 1252 1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1254 { 1255 struct ieee80211_local *local = sdata->local; 1256 struct sta_info *sta, *tmp; 1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1259 1260 mutex_lock(&local->sta_mtx); 1261 1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1263 unsigned long last_active = ieee80211_sta_last_active(sta); 1264 1265 if (sdata != sta->sdata) 1266 continue; 1267 1268 if (time_is_before_jiffies(last_active + exp_time) || 1269 (time_is_before_jiffies(last_active + exp_rsn) && 1270 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1271 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1272 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1273 "not authorized " : "", sta->sta.addr); 1274 1275 WARN_ON(__sta_info_destroy(sta)); 1276 } 1277 } 1278 1279 mutex_unlock(&local->sta_mtx); 1280 } 1281 1282 /* 1283 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1284 */ 1285 1286 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1287 { 1288 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1289 enum nl80211_bss_scan_width scan_width; 1290 1291 sdata_assert_lock(sdata); 1292 1293 mod_timer(&ifibss->timer, 1294 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1295 1296 ieee80211_ibss_sta_expire(sdata); 1297 1298 if (time_before(jiffies, ifibss->last_scan_completed + 1299 IEEE80211_IBSS_MERGE_INTERVAL)) 1300 return; 1301 1302 if (ieee80211_sta_active_ibss(sdata)) 1303 return; 1304 1305 if (ifibss->fixed_channel) 1306 return; 1307 1308 sdata_info(sdata, 1309 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1310 1311 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1312 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1313 NULL, 0, scan_width); 1314 } 1315 1316 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1317 { 1318 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1319 u8 bssid[ETH_ALEN]; 1320 u16 capability; 1321 int i; 1322 1323 sdata_assert_lock(sdata); 1324 1325 if (ifibss->fixed_bssid) { 1326 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1327 } else { 1328 /* Generate random, not broadcast, locally administered BSSID. Mix in 1329 * own MAC address to make sure that devices that do not have proper 1330 * random number generator get different BSSID. */ 1331 get_random_bytes(bssid, ETH_ALEN); 1332 for (i = 0; i < ETH_ALEN; i++) 1333 bssid[i] ^= sdata->vif.addr[i]; 1334 bssid[0] &= ~0x01; 1335 bssid[0] |= 0x02; 1336 } 1337 1338 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1339 1340 capability = WLAN_CAPABILITY_IBSS; 1341 1342 if (ifibss->privacy) 1343 capability |= WLAN_CAPABILITY_PRIVACY; 1344 1345 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1346 &ifibss->chandef, ifibss->basic_rates, 1347 capability, 0, true); 1348 } 1349 1350 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1351 struct ieee80211_channel **channels, 1352 unsigned int channels_max, 1353 u32 center_freq, u32 width) 1354 { 1355 struct ieee80211_channel *chan = NULL; 1356 unsigned int n_chan = 0; 1357 u32 start_freq, end_freq, freq; 1358 1359 if (width <= 20) { 1360 start_freq = center_freq; 1361 end_freq = center_freq; 1362 } else { 1363 start_freq = center_freq - width / 2 + 10; 1364 end_freq = center_freq + width / 2 - 10; 1365 } 1366 1367 for (freq = start_freq; freq <= end_freq; freq += 20) { 1368 chan = ieee80211_get_channel(wiphy, freq); 1369 if (!chan) 1370 continue; 1371 if (n_chan >= channels_max) 1372 return n_chan; 1373 1374 channels[n_chan] = chan; 1375 n_chan++; 1376 } 1377 1378 return n_chan; 1379 } 1380 1381 static unsigned int 1382 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1383 const struct cfg80211_chan_def *chandef, 1384 struct ieee80211_channel **channels, 1385 unsigned int channels_max) 1386 { 1387 unsigned int n_chan = 0; 1388 u32 width, cf1, cf2 = 0; 1389 1390 switch (chandef->width) { 1391 case NL80211_CHAN_WIDTH_40: 1392 width = 40; 1393 break; 1394 case NL80211_CHAN_WIDTH_80P80: 1395 cf2 = chandef->center_freq2; 1396 /* fall through */ 1397 case NL80211_CHAN_WIDTH_80: 1398 width = 80; 1399 break; 1400 case NL80211_CHAN_WIDTH_160: 1401 width = 160; 1402 break; 1403 default: 1404 width = 20; 1405 break; 1406 } 1407 1408 cf1 = chandef->center_freq1; 1409 1410 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1411 1412 if (cf2) 1413 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1414 channels_max - n_chan, cf2, 1415 width); 1416 1417 return n_chan; 1418 } 1419 1420 /* 1421 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1422 */ 1423 1424 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1425 { 1426 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1427 struct ieee80211_local *local = sdata->local; 1428 struct cfg80211_bss *cbss; 1429 struct ieee80211_channel *chan = NULL; 1430 const u8 *bssid = NULL; 1431 enum nl80211_bss_scan_width scan_width; 1432 int active_ibss; 1433 1434 sdata_assert_lock(sdata); 1435 1436 active_ibss = ieee80211_sta_active_ibss(sdata); 1437 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1438 1439 if (active_ibss) 1440 return; 1441 1442 if (ifibss->fixed_bssid) 1443 bssid = ifibss->bssid; 1444 if (ifibss->fixed_channel) 1445 chan = ifibss->chandef.chan; 1446 if (!is_zero_ether_addr(ifibss->bssid)) 1447 bssid = ifibss->bssid; 1448 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1449 ifibss->ssid, ifibss->ssid_len, 1450 IEEE80211_BSS_TYPE_IBSS, 1451 IEEE80211_PRIVACY(ifibss->privacy)); 1452 1453 if (cbss) { 1454 struct ieee80211_bss *bss; 1455 1456 bss = (void *)cbss->priv; 1457 ibss_dbg(sdata, 1458 "sta_find_ibss: selected %pM current %pM\n", 1459 cbss->bssid, ifibss->bssid); 1460 sdata_info(sdata, 1461 "Selected IBSS BSSID %pM based on configured SSID\n", 1462 cbss->bssid); 1463 1464 ieee80211_sta_join_ibss(sdata, bss); 1465 ieee80211_rx_bss_put(local, bss); 1466 return; 1467 } 1468 1469 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1470 * directly and do not waste time scanning 1471 */ 1472 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1473 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1474 bssid); 1475 ieee80211_sta_create_ibss(sdata); 1476 return; 1477 } 1478 1479 1480 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1481 1482 /* Selected IBSS not found in current scan results - try to scan */ 1483 if (time_after(jiffies, ifibss->last_scan_completed + 1484 IEEE80211_SCAN_INTERVAL)) { 1485 struct ieee80211_channel *channels[8]; 1486 unsigned int num; 1487 1488 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1489 1490 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1491 1492 if (ifibss->fixed_channel) { 1493 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1494 &ifibss->chandef, 1495 channels, 1496 ARRAY_SIZE(channels)); 1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1498 ifibss->ssid_len, channels, 1499 num, scan_width); 1500 } else { 1501 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1502 ifibss->ssid_len, NULL, 1503 0, scan_width); 1504 } 1505 } else { 1506 int interval = IEEE80211_SCAN_INTERVAL; 1507 1508 if (time_after(jiffies, ifibss->ibss_join_req + 1509 IEEE80211_IBSS_JOIN_TIMEOUT)) 1510 ieee80211_sta_create_ibss(sdata); 1511 1512 mod_timer(&ifibss->timer, 1513 round_jiffies(jiffies + interval)); 1514 } 1515 } 1516 1517 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1518 struct sk_buff *req) 1519 { 1520 struct ieee80211_mgmt *mgmt = (void *)req->data; 1521 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1522 struct ieee80211_local *local = sdata->local; 1523 int tx_last_beacon, len = req->len; 1524 struct sk_buff *skb; 1525 struct beacon_data *presp; 1526 u8 *pos, *end; 1527 1528 sdata_assert_lock(sdata); 1529 1530 presp = rcu_dereference_protected(ifibss->presp, 1531 lockdep_is_held(&sdata->wdev.mtx)); 1532 1533 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1534 len < 24 + 2 || !presp) 1535 return; 1536 1537 tx_last_beacon = drv_tx_last_beacon(local); 1538 1539 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1540 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1541 mgmt->bssid, tx_last_beacon); 1542 1543 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1544 return; 1545 1546 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1547 !is_broadcast_ether_addr(mgmt->bssid)) 1548 return; 1549 1550 end = ((u8 *) mgmt) + len; 1551 pos = mgmt->u.probe_req.variable; 1552 if (pos[0] != WLAN_EID_SSID || 1553 pos + 2 + pos[1] > end) { 1554 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1555 mgmt->sa); 1556 return; 1557 } 1558 if (pos[1] != 0 && 1559 (pos[1] != ifibss->ssid_len || 1560 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1561 /* Ignore ProbeReq for foreign SSID */ 1562 return; 1563 } 1564 1565 /* Reply with ProbeResp */ 1566 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1567 if (!skb) 1568 return; 1569 1570 skb_reserve(skb, local->tx_headroom); 1571 skb_put_data(skb, presp->head, presp->head_len); 1572 1573 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1574 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1575 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1576 1577 /* avoid excessive retries for probe request to wildcard SSIDs */ 1578 if (pos[1] == 0) 1579 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1580 1581 ieee80211_tx_skb(sdata, skb); 1582 } 1583 1584 static 1585 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1586 struct ieee80211_mgmt *mgmt, size_t len, 1587 struct ieee80211_rx_status *rx_status) 1588 { 1589 size_t baselen; 1590 struct ieee802_11_elems elems; 1591 1592 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1593 offsetof(typeof(mgmt->u.beacon), variable)); 1594 1595 /* 1596 * either beacon or probe_resp but the variable field is at the 1597 * same offset 1598 */ 1599 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1600 if (baselen > len) 1601 return; 1602 1603 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1604 false, &elems, mgmt->bssid, NULL); 1605 1606 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1607 } 1608 1609 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1610 struct sk_buff *skb) 1611 { 1612 struct ieee80211_rx_status *rx_status; 1613 struct ieee80211_mgmt *mgmt; 1614 u16 fc; 1615 struct ieee802_11_elems elems; 1616 int ies_len; 1617 1618 rx_status = IEEE80211_SKB_RXCB(skb); 1619 mgmt = (struct ieee80211_mgmt *) skb->data; 1620 fc = le16_to_cpu(mgmt->frame_control); 1621 1622 sdata_lock(sdata); 1623 1624 if (!sdata->u.ibss.ssid_len) 1625 goto mgmt_out; /* not ready to merge yet */ 1626 1627 switch (fc & IEEE80211_FCTL_STYPE) { 1628 case IEEE80211_STYPE_PROBE_REQ: 1629 ieee80211_rx_mgmt_probe_req(sdata, skb); 1630 break; 1631 case IEEE80211_STYPE_PROBE_RESP: 1632 case IEEE80211_STYPE_BEACON: 1633 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1634 rx_status); 1635 break; 1636 case IEEE80211_STYPE_AUTH: 1637 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1638 break; 1639 case IEEE80211_STYPE_DEAUTH: 1640 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1641 break; 1642 case IEEE80211_STYPE_ACTION: 1643 switch (mgmt->u.action.category) { 1644 case WLAN_CATEGORY_SPECTRUM_MGMT: 1645 ies_len = skb->len - 1646 offsetof(struct ieee80211_mgmt, 1647 u.action.u.chan_switch.variable); 1648 1649 if (ies_len < 0) 1650 break; 1651 1652 ieee802_11_parse_elems( 1653 mgmt->u.action.u.chan_switch.variable, 1654 ies_len, true, &elems, mgmt->bssid, NULL); 1655 1656 if (elems.parse_error) 1657 break; 1658 1659 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1660 rx_status, &elems); 1661 break; 1662 } 1663 } 1664 1665 mgmt_out: 1666 sdata_unlock(sdata); 1667 } 1668 1669 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1670 { 1671 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1672 struct sta_info *sta; 1673 1674 sdata_lock(sdata); 1675 1676 /* 1677 * Work could be scheduled after scan or similar 1678 * when we aren't even joined (or trying) with a 1679 * network. 1680 */ 1681 if (!ifibss->ssid_len) 1682 goto out; 1683 1684 spin_lock_bh(&ifibss->incomplete_lock); 1685 while (!list_empty(&ifibss->incomplete_stations)) { 1686 sta = list_first_entry(&ifibss->incomplete_stations, 1687 struct sta_info, list); 1688 list_del(&sta->list); 1689 spin_unlock_bh(&ifibss->incomplete_lock); 1690 1691 ieee80211_ibss_finish_sta(sta); 1692 rcu_read_unlock(); 1693 spin_lock_bh(&ifibss->incomplete_lock); 1694 } 1695 spin_unlock_bh(&ifibss->incomplete_lock); 1696 1697 switch (ifibss->state) { 1698 case IEEE80211_IBSS_MLME_SEARCH: 1699 ieee80211_sta_find_ibss(sdata); 1700 break; 1701 case IEEE80211_IBSS_MLME_JOINED: 1702 ieee80211_sta_merge_ibss(sdata); 1703 break; 1704 default: 1705 WARN_ON(1); 1706 break; 1707 } 1708 1709 out: 1710 sdata_unlock(sdata); 1711 } 1712 1713 static void ieee80211_ibss_timer(struct timer_list *t) 1714 { 1715 struct ieee80211_sub_if_data *sdata = 1716 from_timer(sdata, t, u.ibss.timer); 1717 1718 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1719 } 1720 1721 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1722 { 1723 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1724 1725 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1726 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1727 spin_lock_init(&ifibss->incomplete_lock); 1728 INIT_WORK(&ifibss->csa_connection_drop_work, 1729 ieee80211_csa_connection_drop_work); 1730 } 1731 1732 /* scan finished notification */ 1733 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1734 { 1735 struct ieee80211_sub_if_data *sdata; 1736 1737 mutex_lock(&local->iflist_mtx); 1738 list_for_each_entry(sdata, &local->interfaces, list) { 1739 if (!ieee80211_sdata_running(sdata)) 1740 continue; 1741 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1742 continue; 1743 sdata->u.ibss.last_scan_completed = jiffies; 1744 } 1745 mutex_unlock(&local->iflist_mtx); 1746 } 1747 1748 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1749 struct cfg80211_ibss_params *params) 1750 { 1751 u32 changed = 0; 1752 u32 rate_flags; 1753 struct ieee80211_supported_band *sband; 1754 enum ieee80211_chanctx_mode chanmode; 1755 struct ieee80211_local *local = sdata->local; 1756 int radar_detect_width = 0; 1757 int i; 1758 int ret; 1759 1760 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1761 ¶ms->chandef, 1762 sdata->wdev.iftype); 1763 if (ret < 0) 1764 return ret; 1765 1766 if (ret > 0) { 1767 if (!params->userspace_handles_dfs) 1768 return -EINVAL; 1769 radar_detect_width = BIT(params->chandef.width); 1770 } 1771 1772 chanmode = (params->channel_fixed && !ret) ? 1773 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1774 1775 mutex_lock(&local->chanctx_mtx); 1776 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1777 radar_detect_width); 1778 mutex_unlock(&local->chanctx_mtx); 1779 if (ret < 0) 1780 return ret; 1781 1782 if (params->bssid) { 1783 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1784 sdata->u.ibss.fixed_bssid = true; 1785 } else 1786 sdata->u.ibss.fixed_bssid = false; 1787 1788 sdata->u.ibss.privacy = params->privacy; 1789 sdata->u.ibss.control_port = params->control_port; 1790 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1791 sdata->u.ibss.basic_rates = params->basic_rates; 1792 sdata->u.ibss.last_scan_completed = jiffies; 1793 1794 /* fix basic_rates if channel does not support these rates */ 1795 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1796 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1797 for (i = 0; i < sband->n_bitrates; i++) { 1798 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1799 sdata->u.ibss.basic_rates &= ~BIT(i); 1800 } 1801 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1802 sizeof(params->mcast_rate)); 1803 1804 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1805 1806 sdata->u.ibss.chandef = params->chandef; 1807 sdata->u.ibss.fixed_channel = params->channel_fixed; 1808 1809 if (params->ie) { 1810 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1811 GFP_KERNEL); 1812 if (sdata->u.ibss.ie) 1813 sdata->u.ibss.ie_len = params->ie_len; 1814 } 1815 1816 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1817 sdata->u.ibss.ibss_join_req = jiffies; 1818 1819 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1820 sdata->u.ibss.ssid_len = params->ssid_len; 1821 1822 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1823 sizeof(sdata->u.ibss.ht_capa)); 1824 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1825 sizeof(sdata->u.ibss.ht_capa_mask)); 1826 1827 /* 1828 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1829 * reserved, but an HT STA shall protect HT transmissions as though 1830 * the HT Protection field were set to non-HT mixed mode. 1831 * 1832 * In an IBSS, the RIFS Mode field of the HT Operation element is 1833 * also reserved, but an HT STA shall operate as though this field 1834 * were set to 1. 1835 */ 1836 1837 sdata->vif.bss_conf.ht_operation_mode |= 1838 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1839 | IEEE80211_HT_PARAM_RIFS_MODE; 1840 1841 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1842 ieee80211_bss_info_change_notify(sdata, changed); 1843 1844 sdata->smps_mode = IEEE80211_SMPS_OFF; 1845 sdata->needed_rx_chains = local->rx_chains; 1846 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1847 1848 ieee80211_queue_work(&local->hw, &sdata->work); 1849 1850 return 0; 1851 } 1852 1853 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1854 { 1855 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1856 1857 ieee80211_ibss_disconnect(sdata); 1858 ifibss->ssid_len = 0; 1859 eth_zero_addr(ifibss->bssid); 1860 1861 /* remove beacon */ 1862 kfree(sdata->u.ibss.ie); 1863 1864 /* on the next join, re-program HT parameters */ 1865 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1866 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1867 1868 synchronize_rcu(); 1869 1870 skb_queue_purge(&sdata->skb_queue); 1871 1872 del_timer_sync(&sdata->u.ibss.timer); 1873 1874 return 0; 1875 } 1876