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