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) 2018-2024 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 55 /* Build IBSS probe response */ 56 frame_len = sizeof(struct ieee80211_hdr_3addr) + 57 12 /* struct ieee80211_mgmt.u.beacon */ + 58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 59 2 + 8 /* max Supported Rates */ + 60 3 /* max DS params */ + 61 4 /* IBSS params */ + 62 5 /* Channel Switch Announcement */ + 63 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 64 2 + sizeof(struct ieee80211_ht_cap) + 65 2 + sizeof(struct ieee80211_ht_operation) + 66 2 + sizeof(struct ieee80211_vht_cap) + 67 2 + sizeof(struct ieee80211_vht_operation) + 68 ifibss->ie_len; 69 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 70 if (!presp) 71 return NULL; 72 73 presp->head = (void *)(presp + 1); 74 75 mgmt = (void *) presp->head; 76 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 77 IEEE80211_STYPE_PROBE_RESP); 78 eth_broadcast_addr(mgmt->da); 79 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 80 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 81 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 82 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 83 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 84 85 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 86 87 *pos++ = WLAN_EID_SSID; 88 *pos++ = ifibss->ssid_len; 89 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 90 pos += ifibss->ssid_len; 91 92 sband = local->hw.wiphy->bands[chandef->chan->band]; 93 rate_flags = ieee80211_chandef_rate_flags(chandef); 94 rates_n = 0; 95 if (have_higher_than_11mbit) 96 *have_higher_than_11mbit = false; 97 98 for (i = 0; i < sband->n_bitrates; i++) { 99 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 100 continue; 101 if (sband->bitrates[i].bitrate > 110 && 102 have_higher_than_11mbit) 103 *have_higher_than_11mbit = true; 104 105 rates |= BIT(i); 106 rates_n++; 107 } 108 109 *pos++ = WLAN_EID_SUPP_RATES; 110 *pos++ = min_t(int, 8, rates_n); 111 for (ri = 0; ri < sband->n_bitrates; ri++) { 112 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 113 u8 basic = 0; 114 if (!(rates & BIT(ri))) 115 continue; 116 117 if (basic_rates & BIT(ri)) 118 basic = 0x80; 119 *pos++ = basic | (u8) rate; 120 if (++rates_added == 8) { 121 ri++; /* continue at next rate for EXT_SUPP_RATES */ 122 break; 123 } 124 } 125 126 if (sband->band == NL80211_BAND_2GHZ) { 127 *pos++ = WLAN_EID_DS_PARAMS; 128 *pos++ = 1; 129 *pos++ = ieee80211_frequency_to_channel( 130 chandef->chan->center_freq); 131 } 132 133 *pos++ = WLAN_EID_IBSS_PARAMS; 134 *pos++ = 2; 135 /* FIX: set ATIM window based on scan results */ 136 *pos++ = 0; 137 *pos++ = 0; 138 139 if (csa_settings) { 140 *pos++ = WLAN_EID_CHANNEL_SWITCH; 141 *pos++ = 3; 142 *pos++ = csa_settings->block_tx ? 1 : 0; 143 *pos++ = ieee80211_frequency_to_channel( 144 csa_settings->chandef.chan->center_freq); 145 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 146 *pos++ = csa_settings->count; 147 presp->cntdwn_current_counter = csa_settings->count; 148 } 149 150 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 151 if (rates_n > 8) { 152 *pos++ = WLAN_EID_EXT_SUPP_RATES; 153 *pos++ = rates_n - 8; 154 for (; ri < sband->n_bitrates; ri++) { 155 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 5); 156 u8 basic = 0; 157 if (!(rates & BIT(ri))) 158 continue; 159 160 if (basic_rates & BIT(ri)) 161 basic = 0x80; 162 *pos++ = basic | (u8) rate; 163 } 164 } 165 166 if (ifibss->ie_len) { 167 memcpy(pos, ifibss->ie, ifibss->ie_len); 168 pos += ifibss->ie_len; 169 } 170 171 /* add HT capability and information IEs */ 172 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 173 chandef->width != NL80211_CHAN_WIDTH_5 && 174 chandef->width != NL80211_CHAN_WIDTH_10 && 175 sband->ht_cap.ht_supported) { 176 struct ieee80211_sta_ht_cap ht_cap; 177 178 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 179 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 180 181 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 182 /* 183 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 184 * field and RIFS Mode are reserved in IBSS mode, therefore 185 * keep them at 0 186 */ 187 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 188 chandef, 0, false); 189 190 /* add VHT capability and information IEs */ 191 if (chandef->width != NL80211_CHAN_WIDTH_20 && 192 chandef->width != NL80211_CHAN_WIDTH_40 && 193 sband->vht_cap.vht_supported) { 194 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 195 sband->vht_cap.cap); 196 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 197 chandef); 198 } 199 } 200 201 if (local->hw.queues >= IEEE80211_NUM_ACS) 202 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 203 204 presp->head_len = pos - presp->head; 205 if (WARN_ON(presp->head_len > frame_len)) 206 goto error; 207 208 return presp; 209 error: 210 kfree(presp); 211 return NULL; 212 } 213 214 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 215 const u8 *bssid, const int beacon_int, 216 struct cfg80211_chan_def *req_chandef, 217 const u32 basic_rates, 218 const u16 capability, u64 tsf, 219 bool creator) 220 { 221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 222 struct ieee80211_local *local = sdata->local; 223 struct ieee80211_mgmt *mgmt; 224 struct cfg80211_bss *bss; 225 u64 bss_change; 226 struct ieee80211_chan_req chanreq = {}; 227 struct ieee80211_channel *chan; 228 struct beacon_data *presp; 229 struct cfg80211_inform_bss bss_meta = {}; 230 bool have_higher_than_11mbit; 231 bool radar_required; 232 int err; 233 234 lockdep_assert_wiphy(local->hw.wiphy); 235 236 /* Reset own TSF to allow time synchronization work. */ 237 drv_reset_tsf(local, sdata); 238 239 if (!ether_addr_equal(ifibss->bssid, bssid)) 240 sta_info_flush(sdata, -1); 241 242 /* if merging, indicate to driver that we leave the old IBSS */ 243 if (sdata->vif.cfg.ibss_joined) { 244 sdata->vif.cfg.ibss_joined = false; 245 sdata->vif.cfg.ibss_creator = false; 246 sdata->vif.bss_conf.enable_beacon = false; 247 netif_carrier_off(sdata->dev); 248 synchronize_net(); 249 ieee80211_bss_info_change_notify(sdata, 250 BSS_CHANGED_IBSS | 251 BSS_CHANGED_BEACON_ENABLED); 252 drv_leave_ibss(local, sdata); 253 } 254 255 presp = sdata_dereference(ifibss->presp, sdata); 256 RCU_INIT_POINTER(ifibss->presp, NULL); 257 if (presp) 258 kfree_rcu(presp, rcu_head); 259 260 /* make a copy of the chandef, it could be modified below. */ 261 chanreq.oper = *req_chandef; 262 chan = chanreq.oper.chan; 263 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 264 NL80211_IFTYPE_ADHOC)) { 265 if (chanreq.oper.width == NL80211_CHAN_WIDTH_5 || 266 chanreq.oper.width == NL80211_CHAN_WIDTH_10 || 267 chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT || 268 chanreq.oper.width == NL80211_CHAN_WIDTH_20) { 269 sdata_info(sdata, 270 "Failed to join IBSS, beacons forbidden\n"); 271 return; 272 } 273 chanreq.oper.width = NL80211_CHAN_WIDTH_20; 274 chanreq.oper.center_freq1 = chan->center_freq; 275 /* check again for downgraded chandef */ 276 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chanreq.oper, 277 NL80211_IFTYPE_ADHOC)) { 278 sdata_info(sdata, 279 "Failed to join IBSS, beacons forbidden\n"); 280 return; 281 } 282 } 283 284 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 285 &chanreq.oper, NL80211_IFTYPE_ADHOC); 286 if (err < 0) { 287 sdata_info(sdata, 288 "Failed to join IBSS, invalid chandef\n"); 289 return; 290 } 291 if (err > 0 && !ifibss->userspace_handles_dfs) { 292 sdata_info(sdata, 293 "Failed to join IBSS, DFS channel without control program\n"); 294 return; 295 } 296 297 radar_required = err; 298 299 if (ieee80211_link_use_channel(&sdata->deflink, &chanreq, 300 ifibss->fixed_channel ? 301 IEEE80211_CHANCTX_SHARED : 302 IEEE80211_CHANCTX_EXCLUSIVE)) { 303 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 304 return; 305 } 306 sdata->deflink.radar_required = radar_required; 307 308 memcpy(ifibss->bssid, bssid, ETH_ALEN); 309 310 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 311 capability, tsf, &chanreq.oper, 312 &have_higher_than_11mbit, NULL); 313 if (!presp) 314 return; 315 316 rcu_assign_pointer(ifibss->presp, presp); 317 mgmt = (void *)presp->head; 318 319 sdata->vif.bss_conf.enable_beacon = true; 320 sdata->vif.bss_conf.beacon_int = beacon_int; 321 sdata->vif.bss_conf.basic_rates = basic_rates; 322 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 323 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 324 bss_change = BSS_CHANGED_BEACON_INT; 325 bss_change |= ieee80211_reset_erp_info(sdata); 326 bss_change |= BSS_CHANGED_BSSID; 327 bss_change |= BSS_CHANGED_BEACON; 328 bss_change |= BSS_CHANGED_BEACON_ENABLED; 329 bss_change |= BSS_CHANGED_BASIC_RATES; 330 bss_change |= BSS_CHANGED_HT; 331 bss_change |= BSS_CHANGED_IBSS; 332 bss_change |= BSS_CHANGED_SSID; 333 334 /* 335 * In 5 GHz/802.11a, we can always use short slot time. 336 * (IEEE 802.11-2012 18.3.8.7) 337 * 338 * In 2.4GHz, we must always use long slots in IBSS for compatibility 339 * reasons. 340 * (IEEE 802.11-2012 19.4.5) 341 * 342 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 343 */ 344 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 345 bss_change |= BSS_CHANGED_ERP_SLOT; 346 347 /* cf. IEEE 802.11 9.2.12 */ 348 sdata->deflink.operating_11g_mode = 349 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 350 351 ieee80211_set_wmm_default(&sdata->deflink, true, false); 352 353 sdata->vif.cfg.ibss_joined = true; 354 sdata->vif.cfg.ibss_creator = creator; 355 356 err = drv_join_ibss(local, sdata); 357 if (err) { 358 sdata->vif.cfg.ibss_joined = false; 359 sdata->vif.cfg.ibss_creator = false; 360 sdata->vif.bss_conf.enable_beacon = false; 361 sdata->vif.cfg.ssid_len = 0; 362 RCU_INIT_POINTER(ifibss->presp, NULL); 363 kfree_rcu(presp, rcu_head); 364 ieee80211_link_release_channel(&sdata->deflink); 365 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 366 err); 367 return; 368 } 369 370 ieee80211_bss_info_change_notify(sdata, bss_change); 371 372 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 373 mod_timer(&ifibss->timer, 374 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 375 376 bss_meta.chan = chan; 377 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 378 presp->head_len, GFP_KERNEL); 379 380 cfg80211_put_bss(local->hw.wiphy, bss); 381 netif_carrier_on(sdata->dev); 382 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 383 } 384 385 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 386 struct ieee80211_bss *bss) 387 { 388 struct cfg80211_bss *cbss = 389 container_of((void *)bss, struct cfg80211_bss, priv); 390 struct ieee80211_supported_band *sband; 391 struct cfg80211_chan_def chandef; 392 u32 basic_rates; 393 int i, j; 394 u16 beacon_int = cbss->beacon_interval; 395 const struct cfg80211_bss_ies *ies; 396 enum nl80211_channel_type chan_type; 397 u64 tsf; 398 u32 rate_flags; 399 400 lockdep_assert_wiphy(sdata->local->hw.wiphy); 401 402 if (beacon_int < 10) 403 beacon_int = 10; 404 405 switch (sdata->u.ibss.chandef.width) { 406 case NL80211_CHAN_WIDTH_20_NOHT: 407 case NL80211_CHAN_WIDTH_20: 408 case NL80211_CHAN_WIDTH_40: 409 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 410 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 411 break; 412 case NL80211_CHAN_WIDTH_5: 413 case NL80211_CHAN_WIDTH_10: 414 cfg80211_chandef_create(&chandef, cbss->channel, 415 NL80211_CHAN_NO_HT); 416 chandef.width = sdata->u.ibss.chandef.width; 417 break; 418 case NL80211_CHAN_WIDTH_80: 419 case NL80211_CHAN_WIDTH_80P80: 420 case NL80211_CHAN_WIDTH_160: 421 chandef = sdata->u.ibss.chandef; 422 chandef.chan = cbss->channel; 423 break; 424 default: 425 /* fall back to 20 MHz for unsupported modes */ 426 cfg80211_chandef_create(&chandef, cbss->channel, 427 NL80211_CHAN_NO_HT); 428 break; 429 } 430 431 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 432 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 433 434 basic_rates = 0; 435 436 for (i = 0; i < bss->supp_rates_len; i++) { 437 int rate = bss->supp_rates[i] & 0x7f; 438 bool is_basic = !!(bss->supp_rates[i] & 0x80); 439 440 for (j = 0; j < sband->n_bitrates; j++) { 441 int brate; 442 if ((rate_flags & sband->bitrates[j].flags) 443 != rate_flags) 444 continue; 445 446 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 5); 447 if (brate == rate) { 448 if (is_basic) 449 basic_rates |= BIT(j); 450 break; 451 } 452 } 453 } 454 455 rcu_read_lock(); 456 ies = rcu_dereference(cbss->ies); 457 tsf = ies->tsf; 458 rcu_read_unlock(); 459 460 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 461 beacon_int, 462 &chandef, 463 basic_rates, 464 cbss->capability, 465 tsf, false); 466 } 467 468 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 469 struct cfg80211_csa_settings *csa_settings, 470 u64 *changed) 471 { 472 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 473 struct beacon_data *presp, *old_presp; 474 struct cfg80211_bss *cbss; 475 const struct cfg80211_bss_ies *ies; 476 u16 capability = WLAN_CAPABILITY_IBSS; 477 u64 tsf; 478 479 lockdep_assert_wiphy(sdata->local->hw.wiphy); 480 481 if (ifibss->privacy) 482 capability |= WLAN_CAPABILITY_PRIVACY; 483 484 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 485 ifibss->bssid, ifibss->ssid, 486 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 487 IEEE80211_PRIVACY(ifibss->privacy)); 488 489 if (unlikely(!cbss)) 490 return -EINVAL; 491 492 rcu_read_lock(); 493 ies = rcu_dereference(cbss->ies); 494 tsf = ies->tsf; 495 rcu_read_unlock(); 496 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 497 498 old_presp = sdata_dereference(ifibss->presp, sdata); 499 500 presp = ieee80211_ibss_build_presp(sdata, 501 sdata->vif.bss_conf.beacon_int, 502 sdata->vif.bss_conf.basic_rates, 503 capability, tsf, &ifibss->chandef, 504 NULL, csa_settings); 505 if (!presp) 506 return -ENOMEM; 507 508 rcu_assign_pointer(ifibss->presp, presp); 509 if (old_presp) 510 kfree_rcu(old_presp, rcu_head); 511 512 *changed |= BSS_CHANGED_BEACON; 513 return 0; 514 } 515 516 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 517 { 518 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 519 struct cfg80211_bss *cbss; 520 521 lockdep_assert_wiphy(sdata->local->hw.wiphy); 522 523 /* When not connected/joined, sending CSA doesn't make sense. */ 524 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 525 return -ENOLINK; 526 527 /* update cfg80211 bss information with the new channel */ 528 if (!is_zero_ether_addr(ifibss->bssid)) { 529 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 530 ifibss->chandef.chan, 531 ifibss->bssid, ifibss->ssid, 532 ifibss->ssid_len, 533 IEEE80211_BSS_TYPE_IBSS, 534 IEEE80211_PRIVACY(ifibss->privacy)); 535 /* XXX: should not really modify cfg80211 data */ 536 if (cbss) { 537 cbss->channel = sdata->deflink.csa.chanreq.oper.chan; 538 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 539 } 540 } 541 542 ifibss->chandef = sdata->deflink.csa.chanreq.oper; 543 544 /* generate the beacon */ 545 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 546 } 547 548 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 549 { 550 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 551 552 wiphy_work_cancel(sdata->local->hw.wiphy, 553 &ifibss->csa_connection_drop_work); 554 } 555 556 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 557 __acquires(RCU) 558 { 559 struct ieee80211_sub_if_data *sdata = sta->sdata; 560 u8 addr[ETH_ALEN]; 561 562 memcpy(addr, sta->sta.addr, ETH_ALEN); 563 564 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 565 566 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 567 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 568 /* authorize the station only if the network is not RSN protected. If 569 * not wait for the userspace to authorize it */ 570 if (!sta->sdata->u.ibss.control_port) 571 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 572 573 rate_control_rate_init(&sta->deflink); 574 575 /* If it fails, maybe we raced another insertion? */ 576 if (sta_info_insert_rcu(sta)) 577 return sta_info_get(sdata, addr); 578 return sta; 579 } 580 581 static struct sta_info * 582 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 583 const u8 *addr, u32 supp_rates) 584 __acquires(RCU) 585 { 586 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 587 struct ieee80211_local *local = sdata->local; 588 struct sta_info *sta; 589 struct ieee80211_chanctx_conf *chanctx_conf; 590 struct ieee80211_supported_band *sband; 591 int band; 592 593 /* 594 * XXX: Consider removing the least recently used entry and 595 * allow new one to be added. 596 */ 597 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 598 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 599 sdata->name, addr); 600 rcu_read_lock(); 601 return NULL; 602 } 603 604 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 605 rcu_read_lock(); 606 return NULL; 607 } 608 609 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 610 rcu_read_lock(); 611 return NULL; 612 } 613 614 rcu_read_lock(); 615 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 616 if (WARN_ON_ONCE(!chanctx_conf)) 617 return NULL; 618 band = chanctx_conf->def.chan->band; 619 rcu_read_unlock(); 620 621 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 622 if (!sta) { 623 rcu_read_lock(); 624 return NULL; 625 } 626 627 /* make sure mandatory rates are always added */ 628 sband = local->hw.wiphy->bands[band]; 629 sta->sta.deflink.supp_rates[band] = supp_rates | 630 ieee80211_mandatory_rates(sband); 631 632 return ieee80211_ibss_finish_sta(sta); 633 } 634 635 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 636 { 637 struct ieee80211_local *local = sdata->local; 638 int active = 0; 639 struct sta_info *sta; 640 641 lockdep_assert_wiphy(sdata->local->hw.wiphy); 642 643 rcu_read_lock(); 644 645 list_for_each_entry_rcu(sta, &local->sta_list, list) { 646 unsigned long last_active = ieee80211_sta_last_active(sta); 647 648 if (sta->sdata == sdata && 649 time_is_after_jiffies(last_active + 650 IEEE80211_IBSS_MERGE_INTERVAL)) { 651 active++; 652 break; 653 } 654 } 655 656 rcu_read_unlock(); 657 658 return active; 659 } 660 661 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 662 { 663 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 664 struct ieee80211_local *local = sdata->local; 665 struct cfg80211_bss *cbss; 666 struct beacon_data *presp; 667 struct sta_info *sta; 668 669 lockdep_assert_wiphy(local->hw.wiphy); 670 671 if (!is_zero_ether_addr(ifibss->bssid)) { 672 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 673 ifibss->bssid, ifibss->ssid, 674 ifibss->ssid_len, 675 IEEE80211_BSS_TYPE_IBSS, 676 IEEE80211_PRIVACY(ifibss->privacy)); 677 678 if (cbss) { 679 cfg80211_unlink_bss(local->hw.wiphy, cbss); 680 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 681 } 682 } 683 684 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 685 686 sta_info_flush(sdata, -1); 687 688 spin_lock_bh(&ifibss->incomplete_lock); 689 while (!list_empty(&ifibss->incomplete_stations)) { 690 sta = list_first_entry(&ifibss->incomplete_stations, 691 struct sta_info, list); 692 list_del(&sta->list); 693 spin_unlock_bh(&ifibss->incomplete_lock); 694 695 sta_info_free(local, sta); 696 spin_lock_bh(&ifibss->incomplete_lock); 697 } 698 spin_unlock_bh(&ifibss->incomplete_lock); 699 700 netif_carrier_off(sdata->dev); 701 702 sdata->vif.cfg.ibss_joined = false; 703 sdata->vif.cfg.ibss_creator = false; 704 sdata->vif.bss_conf.enable_beacon = false; 705 sdata->vif.cfg.ssid_len = 0; 706 707 /* remove beacon */ 708 presp = sdata_dereference(ifibss->presp, sdata); 709 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 710 if (presp) 711 kfree_rcu(presp, rcu_head); 712 713 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 714 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 715 BSS_CHANGED_IBSS); 716 drv_leave_ibss(local, sdata); 717 ieee80211_link_release_channel(&sdata->deflink); 718 } 719 720 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 721 struct wiphy_work *work) 722 { 723 struct ieee80211_sub_if_data *sdata = 724 container_of(work, struct ieee80211_sub_if_data, 725 u.ibss.csa_connection_drop_work); 726 727 ieee80211_ibss_disconnect(sdata); 728 synchronize_rcu(); 729 skb_queue_purge(&sdata->skb_queue); 730 731 /* trigger a scan to find another IBSS network to join */ 732 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 733 } 734 735 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 736 { 737 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 738 int err; 739 740 /* if the current channel is a DFS channel, mark the channel as 741 * unavailable. 742 */ 743 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 744 &ifibss->chandef, 745 NL80211_IFTYPE_ADHOC); 746 if (err > 0) 747 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 748 GFP_ATOMIC); 749 } 750 751 static bool 752 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 753 struct ieee802_11_elems *elems, 754 bool beacon) 755 { 756 struct cfg80211_csa_settings params; 757 struct ieee80211_csa_ie csa_ie; 758 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 759 enum nl80211_channel_type ch_type; 760 int err; 761 struct ieee80211_conn_settings conn = { 762 .mode = IEEE80211_CONN_MODE_HT, 763 .bw_limit = IEEE80211_CONN_BW_LIMIT_40, 764 }; 765 u32 vht_cap_info = 0; 766 767 lockdep_assert_wiphy(sdata->local->hw.wiphy); 768 769 switch (ifibss->chandef.width) { 770 case NL80211_CHAN_WIDTH_5: 771 case NL80211_CHAN_WIDTH_10: 772 case NL80211_CHAN_WIDTH_20_NOHT: 773 conn.mode = IEEE80211_CONN_MODE_LEGACY; 774 fallthrough; 775 case NL80211_CHAN_WIDTH_20: 776 conn.bw_limit = IEEE80211_CONN_BW_LIMIT_20; 777 break; 778 default: 779 break; 780 } 781 782 if (elems->vht_cap_elem) 783 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 784 785 memset(¶ms, 0, sizeof(params)); 786 err = ieee80211_parse_ch_switch_ie(sdata, elems, 787 ifibss->chandef.chan->band, 788 vht_cap_info, &conn, 789 ifibss->bssid, false, 790 &csa_ie); 791 /* can't switch to destination channel, fail */ 792 if (err < 0) 793 goto disconnect; 794 795 /* did not contain a CSA */ 796 if (err) 797 return false; 798 799 /* channel switch is not supported, disconnect */ 800 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 801 goto disconnect; 802 803 params.count = csa_ie.count; 804 params.chandef = csa_ie.chanreq.oper; 805 806 switch (ifibss->chandef.width) { 807 case NL80211_CHAN_WIDTH_20_NOHT: 808 case NL80211_CHAN_WIDTH_20: 809 case NL80211_CHAN_WIDTH_40: 810 /* keep our current HT mode (HT20/HT40+/HT40-), even if 811 * another mode has been announced. The mode is not adopted 812 * within the beacon while doing CSA and we should therefore 813 * keep the mode which we announce. 814 */ 815 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 816 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 817 ch_type); 818 break; 819 case NL80211_CHAN_WIDTH_5: 820 case NL80211_CHAN_WIDTH_10: 821 if (params.chandef.width != ifibss->chandef.width) { 822 sdata_info(sdata, 823 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 824 ifibss->bssid, 825 params.chandef.chan->center_freq, 826 params.chandef.width, 827 params.chandef.center_freq1, 828 params.chandef.center_freq2); 829 goto disconnect; 830 } 831 break; 832 default: 833 /* should not happen, conn_flags should prevent VHT modes. */ 834 WARN_ON(1); 835 goto disconnect; 836 } 837 838 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 839 NL80211_IFTYPE_ADHOC)) { 840 sdata_info(sdata, 841 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 842 ifibss->bssid, 843 params.chandef.chan->center_freq, 844 params.chandef.width, 845 params.chandef.center_freq1, 846 params.chandef.center_freq2); 847 goto disconnect; 848 } 849 850 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 851 ¶ms.chandef, 852 NL80211_IFTYPE_ADHOC); 853 if (err < 0) 854 goto disconnect; 855 if (err > 0 && !ifibss->userspace_handles_dfs) { 856 /* IBSS-DFS only allowed with a control program */ 857 goto disconnect; 858 } 859 860 params.radar_required = err; 861 862 if (cfg80211_chandef_identical(¶ms.chandef, 863 &sdata->vif.bss_conf.chanreq.oper)) { 864 ibss_dbg(sdata, 865 "received csa with an identical chandef, ignoring\n"); 866 return true; 867 } 868 869 /* all checks done, now perform the channel switch. */ 870 ibss_dbg(sdata, 871 "received channel switch announcement to go to channel %d MHz\n", 872 params.chandef.chan->center_freq); 873 874 params.block_tx = !!csa_ie.mode; 875 876 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 877 ¶ms)) 878 goto disconnect; 879 880 ieee80211_ibss_csa_mark_radar(sdata); 881 882 return true; 883 disconnect: 884 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 885 wiphy_work_queue(sdata->local->hw.wiphy, 886 &ifibss->csa_connection_drop_work); 887 888 ieee80211_ibss_csa_mark_radar(sdata); 889 890 return true; 891 } 892 893 static void 894 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 895 struct ieee80211_mgmt *mgmt, size_t len, 896 struct ieee80211_rx_status *rx_status, 897 struct ieee802_11_elems *elems) 898 { 899 int required_len; 900 901 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 902 return; 903 904 /* CSA is the only action we handle for now */ 905 if (mgmt->u.action.u.measurement.action_code != 906 WLAN_ACTION_SPCT_CHL_SWITCH) 907 return; 908 909 required_len = IEEE80211_MIN_ACTION_SIZE + 910 sizeof(mgmt->u.action.u.chan_switch); 911 if (len < required_len) 912 return; 913 914 if (!sdata->vif.bss_conf.csa_active) 915 ieee80211_ibss_process_chanswitch(sdata, elems, false); 916 } 917 918 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 919 struct ieee80211_mgmt *mgmt, 920 size_t len) 921 { 922 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 923 924 if (len < IEEE80211_DEAUTH_FRAME_LEN) 925 return; 926 927 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 928 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 929 sta_info_destroy_addr(sdata, mgmt->sa); 930 } 931 932 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 933 struct ieee80211_mgmt *mgmt, 934 size_t len) 935 { 936 u16 auth_alg, auth_transaction; 937 938 lockdep_assert_wiphy(sdata->local->hw.wiphy); 939 940 if (len < 24 + 6) 941 return; 942 943 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 944 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 945 946 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 947 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 948 mgmt->bssid, auth_transaction); 949 950 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 951 return; 952 953 /* 954 * IEEE 802.11 standard does not require authentication in IBSS 955 * networks and most implementations do not seem to use it. 956 * However, try to reply to authentication attempts if someone 957 * has actually implemented this. 958 */ 959 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 960 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 961 } 962 963 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 964 struct ieee80211_mgmt *mgmt, size_t len, 965 struct ieee80211_rx_status *rx_status, 966 struct ieee802_11_elems *elems, 967 struct ieee80211_channel *channel) 968 { 969 struct sta_info *sta; 970 enum nl80211_band band = rx_status->band; 971 struct ieee80211_local *local = sdata->local; 972 struct ieee80211_supported_band *sband; 973 bool rates_updated = false; 974 u32 supp_rates = 0; 975 976 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 977 return; 978 979 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 980 return; 981 982 sband = local->hw.wiphy->bands[band]; 983 if (WARN_ON(!sband)) 984 return; 985 986 rcu_read_lock(); 987 sta = sta_info_get(sdata, mgmt->sa); 988 989 if (elems->supp_rates) { 990 supp_rates = ieee80211_sta_get_rates(sdata, elems, 991 band, NULL); 992 if (sta) { 993 u32 prev_rates; 994 995 prev_rates = sta->sta.deflink.supp_rates[band]; 996 997 sta->sta.deflink.supp_rates[band] = supp_rates | 998 ieee80211_mandatory_rates(sband); 999 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 1000 ibss_dbg(sdata, 1001 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1002 sta->sta.addr, prev_rates, 1003 sta->sta.deflink.supp_rates[band]); 1004 rates_updated = true; 1005 } 1006 } else { 1007 rcu_read_unlock(); 1008 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1009 mgmt->sa, supp_rates); 1010 } 1011 } 1012 1013 if (sta && !sta->sta.wme && 1014 (elems->wmm_info || elems->s1g_capab) && 1015 local->hw.queues >= IEEE80211_NUM_ACS) { 1016 sta->sta.wme = true; 1017 ieee80211_check_fast_xmit(sta); 1018 } 1019 1020 if (sta && elems->ht_operation && elems->ht_cap_elem && 1021 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1022 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1023 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1024 /* we both use HT */ 1025 struct ieee80211_ht_cap htcap_ie; 1026 struct cfg80211_chan_def chandef; 1027 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1028 1029 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1030 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1031 1032 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1033 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1034 &htcap_ie, 1035 &sta->deflink); 1036 1037 if (elems->vht_operation && elems->vht_cap_elem && 1038 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1039 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1040 /* we both use VHT */ 1041 struct ieee80211_vht_cap cap_ie; 1042 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1043 u32 vht_cap_info = 1044 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1045 1046 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1047 elems->vht_operation, 1048 elems->ht_operation, 1049 &chandef); 1050 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1051 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1052 &cap_ie, NULL, 1053 &sta->deflink); 1054 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1055 rates_updated |= true; 1056 } 1057 1058 if (bw != sta->sta.deflink.bandwidth) 1059 rates_updated |= true; 1060 1061 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1062 &chandef)) 1063 WARN_ON_ONCE(1); 1064 } 1065 1066 if (sta && rates_updated) { 1067 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1068 u8 rx_nss = sta->sta.deflink.rx_nss; 1069 1070 /* Force rx_nss recalculation */ 1071 sta->sta.deflink.rx_nss = 0; 1072 rate_control_rate_init(&sta->deflink); 1073 if (sta->sta.deflink.rx_nss != rx_nss) 1074 changed |= IEEE80211_RC_NSS_CHANGED; 1075 1076 drv_link_sta_rc_update(local, sdata, &sta->sta.deflink, 1077 changed); 1078 } 1079 1080 rcu_read_unlock(); 1081 } 1082 1083 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1084 struct ieee80211_mgmt *mgmt, size_t len, 1085 struct ieee80211_rx_status *rx_status, 1086 struct ieee802_11_elems *elems) 1087 { 1088 struct ieee80211_local *local = sdata->local; 1089 struct cfg80211_bss *cbss; 1090 struct ieee80211_bss *bss; 1091 struct ieee80211_channel *channel; 1092 u64 beacon_timestamp, rx_timestamp; 1093 u32 supp_rates = 0; 1094 enum nl80211_band band = rx_status->band; 1095 1096 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1097 if (!channel) 1098 return; 1099 1100 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1101 1102 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1103 if (!bss) 1104 return; 1105 1106 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1107 1108 /* same for beacon and probe response */ 1109 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1110 1111 /* check if we need to merge IBSS */ 1112 1113 /* not an IBSS */ 1114 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1115 goto put_bss; 1116 1117 /* different channel */ 1118 if (sdata->u.ibss.fixed_channel && 1119 sdata->u.ibss.chandef.chan != cbss->channel) 1120 goto put_bss; 1121 1122 /* different SSID */ 1123 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1124 memcmp(elems->ssid, sdata->u.ibss.ssid, 1125 sdata->u.ibss.ssid_len)) 1126 goto put_bss; 1127 1128 /* process channel switch */ 1129 if (sdata->vif.bss_conf.csa_active || 1130 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1131 goto put_bss; 1132 1133 /* same BSSID */ 1134 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1135 goto put_bss; 1136 1137 /* we use a fixed BSSID */ 1138 if (sdata->u.ibss.fixed_bssid) 1139 goto put_bss; 1140 1141 if (ieee80211_have_rx_timestamp(rx_status)) { 1142 /* time when timestamp field was received */ 1143 rx_timestamp = 1144 ieee80211_calculate_rx_timestamp(local, rx_status, 1145 len + FCS_LEN, 24); 1146 } else { 1147 /* 1148 * second best option: get current TSF 1149 * (will return -1 if not supported) 1150 */ 1151 rx_timestamp = drv_get_tsf(local, sdata); 1152 } 1153 1154 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1155 mgmt->sa, mgmt->bssid, 1156 (unsigned long long)rx_timestamp); 1157 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1158 (unsigned long long)beacon_timestamp, 1159 (unsigned long long)(rx_timestamp - beacon_timestamp), 1160 jiffies); 1161 1162 if (beacon_timestamp > rx_timestamp) { 1163 ibss_dbg(sdata, 1164 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1165 mgmt->bssid); 1166 ieee80211_sta_join_ibss(sdata, bss); 1167 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1168 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1169 supp_rates); 1170 rcu_read_unlock(); 1171 } 1172 1173 put_bss: 1174 ieee80211_rx_bss_put(local, bss); 1175 } 1176 1177 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1178 const u8 *bssid, const u8 *addr, 1179 u32 supp_rates) 1180 { 1181 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1182 struct ieee80211_local *local = sdata->local; 1183 struct sta_info *sta; 1184 struct ieee80211_chanctx_conf *chanctx_conf; 1185 struct ieee80211_supported_band *sband; 1186 int band; 1187 1188 /* 1189 * XXX: Consider removing the least recently used entry and 1190 * allow new one to be added. 1191 */ 1192 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1193 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1194 sdata->name, addr); 1195 return; 1196 } 1197 1198 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1199 return; 1200 1201 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1202 return; 1203 1204 rcu_read_lock(); 1205 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1206 if (WARN_ON_ONCE(!chanctx_conf)) { 1207 rcu_read_unlock(); 1208 return; 1209 } 1210 band = chanctx_conf->def.chan->band; 1211 rcu_read_unlock(); 1212 1213 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1214 if (!sta) 1215 return; 1216 1217 /* make sure mandatory rates are always added */ 1218 sband = local->hw.wiphy->bands[band]; 1219 sta->sta.deflink.supp_rates[band] = supp_rates | 1220 ieee80211_mandatory_rates(sband); 1221 1222 spin_lock(&ifibss->incomplete_lock); 1223 list_add(&sta->list, &ifibss->incomplete_stations); 1224 spin_unlock(&ifibss->incomplete_lock); 1225 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1226 } 1227 1228 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1229 { 1230 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1231 struct ieee80211_local *local = sdata->local; 1232 struct sta_info *sta, *tmp; 1233 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1234 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1235 1236 lockdep_assert_wiphy(local->hw.wiphy); 1237 1238 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1239 unsigned long last_active = ieee80211_sta_last_active(sta); 1240 1241 if (sdata != sta->sdata) 1242 continue; 1243 1244 if (time_is_before_jiffies(last_active + exp_time) || 1245 (time_is_before_jiffies(last_active + exp_rsn) && 1246 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1247 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1248 1249 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1250 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1251 "not authorized " : "", sta->sta.addr); 1252 1253 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1254 ifibss->bssid, 1255 IEEE80211_STYPE_DEAUTH, 1256 WLAN_REASON_DEAUTH_LEAVING, 1257 true, frame_buf); 1258 WARN_ON(__sta_info_destroy(sta)); 1259 } 1260 } 1261 } 1262 1263 /* 1264 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1265 */ 1266 1267 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1268 { 1269 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1270 1271 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1272 1273 mod_timer(&ifibss->timer, 1274 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1275 1276 ieee80211_ibss_sta_expire(sdata); 1277 1278 if (time_before(jiffies, ifibss->last_scan_completed + 1279 IEEE80211_IBSS_MERGE_INTERVAL)) 1280 return; 1281 1282 if (ieee80211_sta_active_ibss(sdata)) 1283 return; 1284 1285 if (ifibss->fixed_channel) 1286 return; 1287 1288 sdata_info(sdata, 1289 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1290 1291 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1292 NULL, 0); 1293 } 1294 1295 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1296 { 1297 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1298 u8 bssid[ETH_ALEN]; 1299 u16 capability; 1300 int i; 1301 1302 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1303 1304 if (ifibss->fixed_bssid) { 1305 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1306 } else { 1307 /* Generate random, not broadcast, locally administered BSSID. Mix in 1308 * own MAC address to make sure that devices that do not have proper 1309 * random number generator get different BSSID. */ 1310 get_random_bytes(bssid, ETH_ALEN); 1311 for (i = 0; i < ETH_ALEN; i++) 1312 bssid[i] ^= sdata->vif.addr[i]; 1313 bssid[0] &= ~0x01; 1314 bssid[0] |= 0x02; 1315 } 1316 1317 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1318 1319 capability = WLAN_CAPABILITY_IBSS; 1320 1321 if (ifibss->privacy) 1322 capability |= WLAN_CAPABILITY_PRIVACY; 1323 1324 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1325 &ifibss->chandef, ifibss->basic_rates, 1326 capability, 0, true); 1327 } 1328 1329 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1330 struct ieee80211_channel **channels, 1331 unsigned int channels_max, 1332 u32 center_freq, u32 width) 1333 { 1334 struct ieee80211_channel *chan = NULL; 1335 unsigned int n_chan = 0; 1336 u32 start_freq, end_freq, freq; 1337 1338 if (width <= 20) { 1339 start_freq = center_freq; 1340 end_freq = center_freq; 1341 } else { 1342 start_freq = center_freq - width / 2 + 10; 1343 end_freq = center_freq + width / 2 - 10; 1344 } 1345 1346 for (freq = start_freq; freq <= end_freq; freq += 20) { 1347 chan = ieee80211_get_channel(wiphy, freq); 1348 if (!chan) 1349 continue; 1350 if (n_chan >= channels_max) 1351 return n_chan; 1352 1353 channels[n_chan] = chan; 1354 n_chan++; 1355 } 1356 1357 return n_chan; 1358 } 1359 1360 static unsigned int 1361 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1362 const struct cfg80211_chan_def *chandef, 1363 struct ieee80211_channel **channels, 1364 unsigned int channels_max) 1365 { 1366 unsigned int n_chan = 0; 1367 u32 width, cf1, cf2 = 0; 1368 1369 switch (chandef->width) { 1370 case NL80211_CHAN_WIDTH_40: 1371 width = 40; 1372 break; 1373 case NL80211_CHAN_WIDTH_80P80: 1374 cf2 = chandef->center_freq2; 1375 fallthrough; 1376 case NL80211_CHAN_WIDTH_80: 1377 width = 80; 1378 break; 1379 case NL80211_CHAN_WIDTH_160: 1380 width = 160; 1381 break; 1382 default: 1383 width = 20; 1384 break; 1385 } 1386 1387 cf1 = chandef->center_freq1; 1388 1389 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1390 1391 if (cf2) 1392 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1393 channels_max - n_chan, cf2, 1394 width); 1395 1396 return n_chan; 1397 } 1398 1399 /* 1400 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1401 */ 1402 1403 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1404 { 1405 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1406 struct ieee80211_local *local = sdata->local; 1407 struct cfg80211_bss *cbss; 1408 struct ieee80211_channel *chan = NULL; 1409 const u8 *bssid = NULL; 1410 int active_ibss; 1411 1412 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1413 1414 active_ibss = ieee80211_sta_active_ibss(sdata); 1415 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1416 1417 if (active_ibss) 1418 return; 1419 1420 if (ifibss->fixed_bssid) 1421 bssid = ifibss->bssid; 1422 if (ifibss->fixed_channel) 1423 chan = ifibss->chandef.chan; 1424 if (!is_zero_ether_addr(ifibss->bssid)) 1425 bssid = ifibss->bssid; 1426 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1427 ifibss->ssid, ifibss->ssid_len, 1428 IEEE80211_BSS_TYPE_IBSS, 1429 IEEE80211_PRIVACY(ifibss->privacy)); 1430 1431 if (cbss) { 1432 struct ieee80211_bss *bss; 1433 1434 bss = (void *)cbss->priv; 1435 ibss_dbg(sdata, 1436 "sta_find_ibss: selected %pM current %pM\n", 1437 cbss->bssid, ifibss->bssid); 1438 sdata_info(sdata, 1439 "Selected IBSS BSSID %pM based on configured SSID\n", 1440 cbss->bssid); 1441 1442 ieee80211_sta_join_ibss(sdata, bss); 1443 ieee80211_rx_bss_put(local, bss); 1444 return; 1445 } 1446 1447 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1448 * directly and do not waste time scanning 1449 */ 1450 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1451 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1452 bssid); 1453 ieee80211_sta_create_ibss(sdata); 1454 return; 1455 } 1456 1457 1458 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1459 1460 /* Selected IBSS not found in current scan results - try to scan */ 1461 if (time_after(jiffies, ifibss->last_scan_completed + 1462 IEEE80211_SCAN_INTERVAL)) { 1463 struct ieee80211_channel *channels[8]; 1464 unsigned int num; 1465 1466 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1467 1468 if (ifibss->fixed_channel) { 1469 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1470 &ifibss->chandef, 1471 channels, 1472 ARRAY_SIZE(channels)); 1473 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1474 ifibss->ssid_len, channels, 1475 num); 1476 } else { 1477 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1478 ifibss->ssid_len, NULL, 0); 1479 } 1480 } else { 1481 int interval = IEEE80211_SCAN_INTERVAL; 1482 1483 if (time_after(jiffies, ifibss->ibss_join_req + 1484 IEEE80211_IBSS_JOIN_TIMEOUT)) 1485 ieee80211_sta_create_ibss(sdata); 1486 1487 mod_timer(&ifibss->timer, 1488 round_jiffies(jiffies + interval)); 1489 } 1490 } 1491 1492 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1493 struct sk_buff *req) 1494 { 1495 struct ieee80211_mgmt *mgmt = (void *)req->data; 1496 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1497 struct ieee80211_local *local = sdata->local; 1498 int tx_last_beacon, len = req->len; 1499 struct sk_buff *skb; 1500 struct beacon_data *presp; 1501 u8 *pos, *end; 1502 1503 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1504 1505 presp = sdata_dereference(ifibss->presp, sdata); 1506 1507 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1508 len < 24 + 2 || !presp) 1509 return; 1510 1511 tx_last_beacon = drv_tx_last_beacon(local); 1512 1513 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1514 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1515 mgmt->bssid, tx_last_beacon); 1516 1517 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1518 return; 1519 1520 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1521 !is_broadcast_ether_addr(mgmt->bssid)) 1522 return; 1523 1524 end = ((u8 *) mgmt) + len; 1525 pos = mgmt->u.probe_req.variable; 1526 if (pos[0] != WLAN_EID_SSID || 1527 pos + 2 + pos[1] > end) { 1528 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1529 mgmt->sa); 1530 return; 1531 } 1532 if (pos[1] != 0 && 1533 (pos[1] != ifibss->ssid_len || 1534 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1535 /* Ignore ProbeReq for foreign SSID */ 1536 return; 1537 } 1538 1539 /* Reply with ProbeResp */ 1540 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1541 if (!skb) 1542 return; 1543 1544 skb_reserve(skb, local->tx_headroom); 1545 skb_put_data(skb, presp->head, presp->head_len); 1546 1547 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1548 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1549 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1550 1551 /* avoid excessive retries for probe request to wildcard SSIDs */ 1552 if (pos[1] == 0) 1553 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1554 1555 ieee80211_tx_skb(sdata, skb); 1556 } 1557 1558 static 1559 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1560 struct ieee80211_mgmt *mgmt, size_t len, 1561 struct ieee80211_rx_status *rx_status) 1562 { 1563 size_t baselen; 1564 struct ieee802_11_elems *elems; 1565 1566 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1567 offsetof(typeof(mgmt->u.beacon), variable)); 1568 1569 /* 1570 * either beacon or probe_resp but the variable field is at the 1571 * same offset 1572 */ 1573 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1574 if (baselen > len) 1575 return; 1576 1577 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1578 len - baselen, false, NULL); 1579 1580 if (elems) { 1581 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1582 kfree(elems); 1583 } 1584 } 1585 1586 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1587 struct sk_buff *skb) 1588 { 1589 struct ieee80211_rx_status *rx_status; 1590 struct ieee80211_mgmt *mgmt; 1591 u16 fc; 1592 struct ieee802_11_elems *elems; 1593 int ies_len; 1594 1595 rx_status = IEEE80211_SKB_RXCB(skb); 1596 mgmt = (struct ieee80211_mgmt *) skb->data; 1597 fc = le16_to_cpu(mgmt->frame_control); 1598 1599 if (!sdata->u.ibss.ssid_len) 1600 return; /* not ready to merge yet */ 1601 1602 switch (fc & IEEE80211_FCTL_STYPE) { 1603 case IEEE80211_STYPE_PROBE_REQ: 1604 ieee80211_rx_mgmt_probe_req(sdata, skb); 1605 break; 1606 case IEEE80211_STYPE_PROBE_RESP: 1607 case IEEE80211_STYPE_BEACON: 1608 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1609 rx_status); 1610 break; 1611 case IEEE80211_STYPE_AUTH: 1612 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1613 break; 1614 case IEEE80211_STYPE_DEAUTH: 1615 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1616 break; 1617 case IEEE80211_STYPE_ACTION: 1618 switch (mgmt->u.action.category) { 1619 case WLAN_CATEGORY_SPECTRUM_MGMT: 1620 ies_len = skb->len - 1621 offsetof(struct ieee80211_mgmt, 1622 u.action.u.chan_switch.variable); 1623 1624 if (ies_len < 0) 1625 break; 1626 1627 elems = ieee802_11_parse_elems( 1628 mgmt->u.action.u.chan_switch.variable, 1629 ies_len, true, NULL); 1630 1631 if (elems && !elems->parse_error) 1632 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1633 skb->len, 1634 rx_status, 1635 elems); 1636 kfree(elems); 1637 break; 1638 } 1639 } 1640 } 1641 1642 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1643 { 1644 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1645 struct sta_info *sta; 1646 1647 /* 1648 * Work could be scheduled after scan or similar 1649 * when we aren't even joined (or trying) with a 1650 * network. 1651 */ 1652 if (!ifibss->ssid_len) 1653 return; 1654 1655 spin_lock_bh(&ifibss->incomplete_lock); 1656 while (!list_empty(&ifibss->incomplete_stations)) { 1657 sta = list_first_entry(&ifibss->incomplete_stations, 1658 struct sta_info, list); 1659 list_del(&sta->list); 1660 spin_unlock_bh(&ifibss->incomplete_lock); 1661 1662 ieee80211_ibss_finish_sta(sta); 1663 rcu_read_unlock(); 1664 spin_lock_bh(&ifibss->incomplete_lock); 1665 } 1666 spin_unlock_bh(&ifibss->incomplete_lock); 1667 1668 switch (ifibss->state) { 1669 case IEEE80211_IBSS_MLME_SEARCH: 1670 ieee80211_sta_find_ibss(sdata); 1671 break; 1672 case IEEE80211_IBSS_MLME_JOINED: 1673 ieee80211_sta_merge_ibss(sdata); 1674 break; 1675 default: 1676 WARN_ON(1); 1677 break; 1678 } 1679 } 1680 1681 static void ieee80211_ibss_timer(struct timer_list *t) 1682 { 1683 struct ieee80211_sub_if_data *sdata = 1684 from_timer(sdata, t, u.ibss.timer); 1685 1686 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1687 } 1688 1689 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1690 { 1691 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1692 1693 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1694 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1695 spin_lock_init(&ifibss->incomplete_lock); 1696 wiphy_work_init(&ifibss->csa_connection_drop_work, 1697 ieee80211_csa_connection_drop_work); 1698 } 1699 1700 /* scan finished notification */ 1701 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1702 { 1703 struct ieee80211_sub_if_data *sdata; 1704 1705 lockdep_assert_wiphy(local->hw.wiphy); 1706 1707 list_for_each_entry(sdata, &local->interfaces, list) { 1708 if (!ieee80211_sdata_running(sdata)) 1709 continue; 1710 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1711 continue; 1712 sdata->u.ibss.last_scan_completed = jiffies; 1713 } 1714 } 1715 1716 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1717 struct cfg80211_ibss_params *params) 1718 { 1719 u64 changed = 0; 1720 u32 rate_flags; 1721 struct ieee80211_supported_band *sband; 1722 enum ieee80211_chanctx_mode chanmode; 1723 struct ieee80211_local *local = sdata->local; 1724 int radar_detect_width = 0; 1725 int i; 1726 int ret; 1727 1728 lockdep_assert_wiphy(local->hw.wiphy); 1729 1730 if (params->chandef.chan->freq_offset) { 1731 /* this may work, but is untested */ 1732 return -EOPNOTSUPP; 1733 } 1734 1735 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1736 ¶ms->chandef, 1737 sdata->wdev.iftype); 1738 if (ret < 0) 1739 return ret; 1740 1741 if (ret > 0) { 1742 if (!params->userspace_handles_dfs) 1743 return -EINVAL; 1744 radar_detect_width = BIT(params->chandef.width); 1745 } 1746 1747 chanmode = (params->channel_fixed && !ret) ? 1748 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1749 1750 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1751 radar_detect_width, -1); 1752 if (ret < 0) 1753 return ret; 1754 1755 if (params->bssid) { 1756 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1757 sdata->u.ibss.fixed_bssid = true; 1758 } else 1759 sdata->u.ibss.fixed_bssid = false; 1760 1761 sdata->u.ibss.privacy = params->privacy; 1762 sdata->u.ibss.control_port = params->control_port; 1763 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1764 sdata->u.ibss.basic_rates = params->basic_rates; 1765 sdata->u.ibss.last_scan_completed = jiffies; 1766 1767 /* fix basic_rates if channel does not support these rates */ 1768 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1769 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1770 for (i = 0; i < sband->n_bitrates; i++) { 1771 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1772 sdata->u.ibss.basic_rates &= ~BIT(i); 1773 } 1774 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1775 sizeof(params->mcast_rate)); 1776 1777 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1778 1779 sdata->u.ibss.chandef = params->chandef; 1780 sdata->u.ibss.fixed_channel = params->channel_fixed; 1781 1782 if (params->ie) { 1783 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1784 GFP_KERNEL); 1785 if (sdata->u.ibss.ie) 1786 sdata->u.ibss.ie_len = params->ie_len; 1787 } 1788 1789 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1790 sdata->u.ibss.ibss_join_req = jiffies; 1791 1792 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1793 sdata->u.ibss.ssid_len = params->ssid_len; 1794 1795 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1796 sizeof(sdata->u.ibss.ht_capa)); 1797 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1798 sizeof(sdata->u.ibss.ht_capa_mask)); 1799 1800 /* 1801 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1802 * reserved, but an HT STA shall protect HT transmissions as though 1803 * the HT Protection field were set to non-HT mixed mode. 1804 * 1805 * In an IBSS, the RIFS Mode field of the HT Operation element is 1806 * also reserved, but an HT STA shall operate as though this field 1807 * were set to 1. 1808 */ 1809 1810 sdata->vif.bss_conf.ht_operation_mode |= 1811 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1812 | IEEE80211_HT_PARAM_RIFS_MODE; 1813 1814 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1815 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1816 1817 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1818 sdata->deflink.needed_rx_chains = local->rx_chains; 1819 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1820 1821 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1822 1823 return 0; 1824 } 1825 1826 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1827 { 1828 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1829 1830 ifibss->ssid_len = 0; 1831 ieee80211_ibss_disconnect(sdata); 1832 eth_zero_addr(ifibss->bssid); 1833 1834 /* remove beacon */ 1835 kfree(sdata->u.ibss.ie); 1836 sdata->u.ibss.ie = NULL; 1837 sdata->u.ibss.ie_len = 0; 1838 1839 /* on the next join, re-program HT parameters */ 1840 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1841 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1842 1843 synchronize_rcu(); 1844 1845 skb_queue_purge(&sdata->skb_queue); 1846 1847 timer_delete_sync(&sdata->u.ibss.timer); 1848 1849 return 0; 1850 } 1851