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) 2018-2023 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 37static struct beacon_data * 38ieee80211_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; 209error: 210 kfree(presp); 211 return NULL; 212} 213 214static 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 384static 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 467int 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 515int 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 547void 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 555static 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 580static struct sta_info * 581ieee80211_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 634static 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 660static 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 719static 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 734static 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 750static bool 751ieee80211_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, &csa_ie); 789 /* can't switch to destination channel, fail */ 790 if (err < 0) 791 goto disconnect; 792 793 /* did not contain a CSA */ 794 if (err) 795 return false; 796 797 /* channel switch is not supported, disconnect */ 798 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 799 goto disconnect; 800 801 params.count = csa_ie.count; 802 params.chandef = csa_ie.chanreq.oper; 803 804 switch (ifibss->chandef.width) { 805 case NL80211_CHAN_WIDTH_20_NOHT: 806 case NL80211_CHAN_WIDTH_20: 807 case NL80211_CHAN_WIDTH_40: 808 /* keep our current HT mode (HT20/HT40+/HT40-), even if 809 * another mode has been announced. The mode is not adopted 810 * within the beacon while doing CSA and we should therefore 811 * keep the mode which we announce. 812 */ 813 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 814 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 815 ch_type); 816 break; 817 case NL80211_CHAN_WIDTH_5: 818 case NL80211_CHAN_WIDTH_10: 819 if (params.chandef.width != ifibss->chandef.width) { 820 sdata_info(sdata, 821 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 822 ifibss->bssid, 823 params.chandef.chan->center_freq, 824 params.chandef.width, 825 params.chandef.center_freq1, 826 params.chandef.center_freq2); 827 goto disconnect; 828 } 829 break; 830 default: 831 /* should not happen, conn_flags should prevent VHT modes. */ 832 WARN_ON(1); 833 goto disconnect; 834 } 835 836 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 837 NL80211_IFTYPE_ADHOC)) { 838 sdata_info(sdata, 839 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 840 ifibss->bssid, 841 params.chandef.chan->center_freq, 842 params.chandef.width, 843 params.chandef.center_freq1, 844 params.chandef.center_freq2); 845 goto disconnect; 846 } 847 848 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 849 ¶ms.chandef, 850 NL80211_IFTYPE_ADHOC); 851 if (err < 0) 852 goto disconnect; 853 if (err > 0 && !ifibss->userspace_handles_dfs) { 854 /* IBSS-DFS only allowed with a control program */ 855 goto disconnect; 856 } 857 858 params.radar_required = err; 859 860 if (cfg80211_chandef_identical(¶ms.chandef, 861 &sdata->vif.bss_conf.chanreq.oper)) { 862 ibss_dbg(sdata, 863 "received csa with an identical chandef, ignoring\n"); 864 return true; 865 } 866 867 /* all checks done, now perform the channel switch. */ 868 ibss_dbg(sdata, 869 "received channel switch announcement to go to channel %d MHz\n", 870 params.chandef.chan->center_freq); 871 872 params.block_tx = !!csa_ie.mode; 873 874 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 875 ¶ms)) 876 goto disconnect; 877 878 ieee80211_ibss_csa_mark_radar(sdata); 879 880 return true; 881disconnect: 882 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 883 wiphy_work_queue(sdata->local->hw.wiphy, 884 &ifibss->csa_connection_drop_work); 885 886 ieee80211_ibss_csa_mark_radar(sdata); 887 888 return true; 889} 890 891static void 892ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 893 struct ieee80211_mgmt *mgmt, size_t len, 894 struct ieee80211_rx_status *rx_status, 895 struct ieee802_11_elems *elems) 896{ 897 int required_len; 898 899 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 900 return; 901 902 /* CSA is the only action we handle for now */ 903 if (mgmt->u.action.u.measurement.action_code != 904 WLAN_ACTION_SPCT_CHL_SWITCH) 905 return; 906 907 required_len = IEEE80211_MIN_ACTION_SIZE + 908 sizeof(mgmt->u.action.u.chan_switch); 909 if (len < required_len) 910 return; 911 912 if (!sdata->vif.bss_conf.csa_active) 913 ieee80211_ibss_process_chanswitch(sdata, elems, false); 914} 915 916static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 917 struct ieee80211_mgmt *mgmt, 918 size_t len) 919{ 920 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 921 922 if (len < IEEE80211_DEAUTH_FRAME_LEN) 923 return; 924 925 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 926 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 927 sta_info_destroy_addr(sdata, mgmt->sa); 928} 929 930static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 931 struct ieee80211_mgmt *mgmt, 932 size_t len) 933{ 934 u16 auth_alg, auth_transaction; 935 936 lockdep_assert_wiphy(sdata->local->hw.wiphy); 937 938 if (len < 24 + 6) 939 return; 940 941 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 942 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 943 944 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 945 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 946 mgmt->bssid, auth_transaction); 947 948 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 949 return; 950 951 /* 952 * IEEE 802.11 standard does not require authentication in IBSS 953 * networks and most implementations do not seem to use it. 954 * However, try to reply to authentication attempts if someone 955 * has actually implemented this. 956 */ 957 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 958 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 959} 960 961static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 962 struct ieee80211_mgmt *mgmt, size_t len, 963 struct ieee80211_rx_status *rx_status, 964 struct ieee802_11_elems *elems, 965 struct ieee80211_channel *channel) 966{ 967 struct sta_info *sta; 968 enum nl80211_band band = rx_status->band; 969 struct ieee80211_local *local = sdata->local; 970 struct ieee80211_supported_band *sband; 971 bool rates_updated = false; 972 u32 supp_rates = 0; 973 974 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 975 return; 976 977 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 978 return; 979 980 sband = local->hw.wiphy->bands[band]; 981 if (WARN_ON(!sband)) 982 return; 983 984 rcu_read_lock(); 985 sta = sta_info_get(sdata, mgmt->sa); 986 987 if (elems->supp_rates) { 988 supp_rates = ieee80211_sta_get_rates(sdata, elems, 989 band, NULL); 990 if (sta) { 991 u32 prev_rates; 992 993 prev_rates = sta->sta.deflink.supp_rates[band]; 994 995 sta->sta.deflink.supp_rates[band] = supp_rates | 996 ieee80211_mandatory_rates(sband); 997 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 998 ibss_dbg(sdata, 999 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1000 sta->sta.addr, prev_rates, 1001 sta->sta.deflink.supp_rates[band]); 1002 rates_updated = true; 1003 } 1004 } else { 1005 rcu_read_unlock(); 1006 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1007 mgmt->sa, supp_rates); 1008 } 1009 } 1010 1011 if (sta && !sta->sta.wme && 1012 (elems->wmm_info || elems->s1g_capab) && 1013 local->hw.queues >= IEEE80211_NUM_ACS) { 1014 sta->sta.wme = true; 1015 ieee80211_check_fast_xmit(sta); 1016 } 1017 1018 if (sta && elems->ht_operation && elems->ht_cap_elem && 1019 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1020 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1021 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1022 /* we both use HT */ 1023 struct ieee80211_ht_cap htcap_ie; 1024 struct cfg80211_chan_def chandef; 1025 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1026 1027 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1028 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1029 1030 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1031 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1032 &htcap_ie, 1033 &sta->deflink); 1034 1035 if (elems->vht_operation && elems->vht_cap_elem && 1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1037 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1038 /* we both use VHT */ 1039 struct ieee80211_vht_cap cap_ie; 1040 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1041 u32 vht_cap_info = 1042 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1043 1044 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1045 elems->vht_operation, 1046 elems->ht_operation, 1047 &chandef); 1048 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1049 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1050 &cap_ie, NULL, 1051 &sta->deflink); 1052 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1053 rates_updated |= true; 1054 } 1055 1056 if (bw != sta->sta.deflink.bandwidth) 1057 rates_updated |= true; 1058 1059 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1060 &chandef)) 1061 WARN_ON_ONCE(1); 1062 } 1063 1064 if (sta && rates_updated) { 1065 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1066 u8 rx_nss = sta->sta.deflink.rx_nss; 1067 1068 /* Force rx_nss recalculation */ 1069 sta->sta.deflink.rx_nss = 0; 1070 rate_control_rate_init(sta); 1071 if (sta->sta.deflink.rx_nss != rx_nss) 1072 changed |= IEEE80211_RC_NSS_CHANGED; 1073 1074 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1075 } 1076 1077 rcu_read_unlock(); 1078} 1079 1080static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1081 struct ieee80211_mgmt *mgmt, size_t len, 1082 struct ieee80211_rx_status *rx_status, 1083 struct ieee802_11_elems *elems) 1084{ 1085 struct ieee80211_local *local = sdata->local; 1086 struct cfg80211_bss *cbss; 1087 struct ieee80211_bss *bss; 1088 struct ieee80211_channel *channel; 1089 u64 beacon_timestamp, rx_timestamp; 1090 u32 supp_rates = 0; 1091 enum nl80211_band band = rx_status->band; 1092 1093 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1094 if (!channel) 1095 return; 1096 1097 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1098 1099 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1100 if (!bss) 1101 return; 1102 1103 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1104 1105 /* same for beacon and probe response */ 1106 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1107 1108 /* check if we need to merge IBSS */ 1109 1110 /* not an IBSS */ 1111 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1112 goto put_bss; 1113 1114 /* different channel */ 1115 if (sdata->u.ibss.fixed_channel && 1116 sdata->u.ibss.chandef.chan != cbss->channel) 1117 goto put_bss; 1118 1119 /* different SSID */ 1120 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1121 memcmp(elems->ssid, sdata->u.ibss.ssid, 1122 sdata->u.ibss.ssid_len)) 1123 goto put_bss; 1124 1125 /* process channel switch */ 1126 if (sdata->vif.bss_conf.csa_active || 1127 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1128 goto put_bss; 1129 1130 /* same BSSID */ 1131 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1132 goto put_bss; 1133 1134 /* we use a fixed BSSID */ 1135 if (sdata->u.ibss.fixed_bssid) 1136 goto put_bss; 1137 1138 if (ieee80211_have_rx_timestamp(rx_status)) { 1139 /* time when timestamp field was received */ 1140 rx_timestamp = 1141 ieee80211_calculate_rx_timestamp(local, rx_status, 1142 len + FCS_LEN, 24); 1143 } else { 1144 /* 1145 * second best option: get current TSF 1146 * (will return -1 if not supported) 1147 */ 1148 rx_timestamp = drv_get_tsf(local, sdata); 1149 } 1150 1151 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1152 mgmt->sa, mgmt->bssid, 1153 (unsigned long long)rx_timestamp); 1154 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1155 (unsigned long long)beacon_timestamp, 1156 (unsigned long long)(rx_timestamp - beacon_timestamp), 1157 jiffies); 1158 1159 if (beacon_timestamp > rx_timestamp) { 1160 ibss_dbg(sdata, 1161 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1162 mgmt->bssid); 1163 ieee80211_sta_join_ibss(sdata, bss); 1164 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1165 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1166 supp_rates); 1167 rcu_read_unlock(); 1168 } 1169 1170 put_bss: 1171 ieee80211_rx_bss_put(local, bss); 1172} 1173 1174void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1175 const u8 *bssid, const u8 *addr, 1176 u32 supp_rates) 1177{ 1178 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1179 struct ieee80211_local *local = sdata->local; 1180 struct sta_info *sta; 1181 struct ieee80211_chanctx_conf *chanctx_conf; 1182 struct ieee80211_supported_band *sband; 1183 int band; 1184 1185 /* 1186 * XXX: Consider removing the least recently used entry and 1187 * allow new one to be added. 1188 */ 1189 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1190 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1191 sdata->name, addr); 1192 return; 1193 } 1194 1195 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1196 return; 1197 1198 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1199 return; 1200 1201 rcu_read_lock(); 1202 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1203 if (WARN_ON_ONCE(!chanctx_conf)) { 1204 rcu_read_unlock(); 1205 return; 1206 } 1207 band = chanctx_conf->def.chan->band; 1208 rcu_read_unlock(); 1209 1210 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1211 if (!sta) 1212 return; 1213 1214 /* make sure mandatory rates are always added */ 1215 sband = local->hw.wiphy->bands[band]; 1216 sta->sta.deflink.supp_rates[band] = supp_rates | 1217 ieee80211_mandatory_rates(sband); 1218 1219 spin_lock(&ifibss->incomplete_lock); 1220 list_add(&sta->list, &ifibss->incomplete_stations); 1221 spin_unlock(&ifibss->incomplete_lock); 1222 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1223} 1224 1225static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1226{ 1227 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1228 struct ieee80211_local *local = sdata->local; 1229 struct sta_info *sta, *tmp; 1230 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1231 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1232 1233 lockdep_assert_wiphy(local->hw.wiphy); 1234 1235 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1236 unsigned long last_active = ieee80211_sta_last_active(sta); 1237 1238 if (sdata != sta->sdata) 1239 continue; 1240 1241 if (time_is_before_jiffies(last_active + exp_time) || 1242 (time_is_before_jiffies(last_active + exp_rsn) && 1243 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1244 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1245 1246 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1247 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1248 "not authorized " : "", sta->sta.addr); 1249 1250 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1251 ifibss->bssid, 1252 IEEE80211_STYPE_DEAUTH, 1253 WLAN_REASON_DEAUTH_LEAVING, 1254 true, frame_buf); 1255 WARN_ON(__sta_info_destroy(sta)); 1256 } 1257 } 1258} 1259 1260/* 1261 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1262 */ 1263 1264static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1265{ 1266 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1267 1268 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1269 1270 mod_timer(&ifibss->timer, 1271 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1272 1273 ieee80211_ibss_sta_expire(sdata); 1274 1275 if (time_before(jiffies, ifibss->last_scan_completed + 1276 IEEE80211_IBSS_MERGE_INTERVAL)) 1277 return; 1278 1279 if (ieee80211_sta_active_ibss(sdata)) 1280 return; 1281 1282 if (ifibss->fixed_channel) 1283 return; 1284 1285 sdata_info(sdata, 1286 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1287 1288 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1289 NULL, 0); 1290} 1291 1292static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1293{ 1294 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1295 u8 bssid[ETH_ALEN]; 1296 u16 capability; 1297 int i; 1298 1299 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1300 1301 if (ifibss->fixed_bssid) { 1302 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1303 } else { 1304 /* Generate random, not broadcast, locally administered BSSID. Mix in 1305 * own MAC address to make sure that devices that do not have proper 1306 * random number generator get different BSSID. */ 1307 get_random_bytes(bssid, ETH_ALEN); 1308 for (i = 0; i < ETH_ALEN; i++) 1309 bssid[i] ^= sdata->vif.addr[i]; 1310 bssid[0] &= ~0x01; 1311 bssid[0] |= 0x02; 1312 } 1313 1314 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1315 1316 capability = WLAN_CAPABILITY_IBSS; 1317 1318 if (ifibss->privacy) 1319 capability |= WLAN_CAPABILITY_PRIVACY; 1320 1321 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1322 &ifibss->chandef, ifibss->basic_rates, 1323 capability, 0, true); 1324} 1325 1326static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1327 struct ieee80211_channel **channels, 1328 unsigned int channels_max, 1329 u32 center_freq, u32 width) 1330{ 1331 struct ieee80211_channel *chan = NULL; 1332 unsigned int n_chan = 0; 1333 u32 start_freq, end_freq, freq; 1334 1335 if (width <= 20) { 1336 start_freq = center_freq; 1337 end_freq = center_freq; 1338 } else { 1339 start_freq = center_freq - width / 2 + 10; 1340 end_freq = center_freq + width / 2 - 10; 1341 } 1342 1343 for (freq = start_freq; freq <= end_freq; freq += 20) { 1344 chan = ieee80211_get_channel(wiphy, freq); 1345 if (!chan) 1346 continue; 1347 if (n_chan >= channels_max) 1348 return n_chan; 1349 1350 channels[n_chan] = chan; 1351 n_chan++; 1352 } 1353 1354 return n_chan; 1355} 1356 1357static unsigned int 1358ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1359 const struct cfg80211_chan_def *chandef, 1360 struct ieee80211_channel **channels, 1361 unsigned int channels_max) 1362{ 1363 unsigned int n_chan = 0; 1364 u32 width, cf1, cf2 = 0; 1365 1366 switch (chandef->width) { 1367 case NL80211_CHAN_WIDTH_40: 1368 width = 40; 1369 break; 1370 case NL80211_CHAN_WIDTH_80P80: 1371 cf2 = chandef->center_freq2; 1372 fallthrough; 1373 case NL80211_CHAN_WIDTH_80: 1374 width = 80; 1375 break; 1376 case NL80211_CHAN_WIDTH_160: 1377 width = 160; 1378 break; 1379 default: 1380 width = 20; 1381 break; 1382 } 1383 1384 cf1 = chandef->center_freq1; 1385 1386 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1387 1388 if (cf2) 1389 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1390 channels_max - n_chan, cf2, 1391 width); 1392 1393 return n_chan; 1394} 1395 1396/* 1397 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1398 */ 1399 1400static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1401{ 1402 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1403 struct ieee80211_local *local = sdata->local; 1404 struct cfg80211_bss *cbss; 1405 struct ieee80211_channel *chan = NULL; 1406 const u8 *bssid = NULL; 1407 int active_ibss; 1408 1409 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1410 1411 active_ibss = ieee80211_sta_active_ibss(sdata); 1412 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1413 1414 if (active_ibss) 1415 return; 1416 1417 if (ifibss->fixed_bssid) 1418 bssid = ifibss->bssid; 1419 if (ifibss->fixed_channel) 1420 chan = ifibss->chandef.chan; 1421 if (!is_zero_ether_addr(ifibss->bssid)) 1422 bssid = ifibss->bssid; 1423 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1424 ifibss->ssid, ifibss->ssid_len, 1425 IEEE80211_BSS_TYPE_IBSS, 1426 IEEE80211_PRIVACY(ifibss->privacy)); 1427 1428 if (cbss) { 1429 struct ieee80211_bss *bss; 1430 1431 bss = (void *)cbss->priv; 1432 ibss_dbg(sdata, 1433 "sta_find_ibss: selected %pM current %pM\n", 1434 cbss->bssid, ifibss->bssid); 1435 sdata_info(sdata, 1436 "Selected IBSS BSSID %pM based on configured SSID\n", 1437 cbss->bssid); 1438 1439 ieee80211_sta_join_ibss(sdata, bss); 1440 ieee80211_rx_bss_put(local, bss); 1441 return; 1442 } 1443 1444 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1445 * directly and do not waste time scanning 1446 */ 1447 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1448 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1449 bssid); 1450 ieee80211_sta_create_ibss(sdata); 1451 return; 1452 } 1453 1454 1455 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1456 1457 /* Selected IBSS not found in current scan results - try to scan */ 1458 if (time_after(jiffies, ifibss->last_scan_completed + 1459 IEEE80211_SCAN_INTERVAL)) { 1460 struct ieee80211_channel *channels[8]; 1461 unsigned int num; 1462 1463 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1464 1465 if (ifibss->fixed_channel) { 1466 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1467 &ifibss->chandef, 1468 channels, 1469 ARRAY_SIZE(channels)); 1470 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1471 ifibss->ssid_len, channels, 1472 num); 1473 } else { 1474 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1475 ifibss->ssid_len, NULL, 0); 1476 } 1477 } else { 1478 int interval = IEEE80211_SCAN_INTERVAL; 1479 1480 if (time_after(jiffies, ifibss->ibss_join_req + 1481 IEEE80211_IBSS_JOIN_TIMEOUT)) 1482 ieee80211_sta_create_ibss(sdata); 1483 1484 mod_timer(&ifibss->timer, 1485 round_jiffies(jiffies + interval)); 1486 } 1487} 1488 1489static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1490 struct sk_buff *req) 1491{ 1492 struct ieee80211_mgmt *mgmt = (void *)req->data; 1493 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1494 struct ieee80211_local *local = sdata->local; 1495 int tx_last_beacon, len = req->len; 1496 struct sk_buff *skb; 1497 struct beacon_data *presp; 1498 u8 *pos, *end; 1499 1500 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1501 1502 presp = sdata_dereference(ifibss->presp, sdata); 1503 1504 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1505 len < 24 + 2 || !presp) 1506 return; 1507 1508 tx_last_beacon = drv_tx_last_beacon(local); 1509 1510 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1511 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1512 mgmt->bssid, tx_last_beacon); 1513 1514 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1515 return; 1516 1517 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1518 !is_broadcast_ether_addr(mgmt->bssid)) 1519 return; 1520 1521 end = ((u8 *) mgmt) + len; 1522 pos = mgmt->u.probe_req.variable; 1523 if (pos[0] != WLAN_EID_SSID || 1524 pos + 2 + pos[1] > end) { 1525 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1526 mgmt->sa); 1527 return; 1528 } 1529 if (pos[1] != 0 && 1530 (pos[1] != ifibss->ssid_len || 1531 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1532 /* Ignore ProbeReq for foreign SSID */ 1533 return; 1534 } 1535 1536 /* Reply with ProbeResp */ 1537 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1538 if (!skb) 1539 return; 1540 1541 skb_reserve(skb, local->tx_headroom); 1542 skb_put_data(skb, presp->head, presp->head_len); 1543 1544 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1545 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1546 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1547 1548 /* avoid excessive retries for probe request to wildcard SSIDs */ 1549 if (pos[1] == 0) 1550 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1551 1552 ieee80211_tx_skb(sdata, skb); 1553} 1554 1555static 1556void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1557 struct ieee80211_mgmt *mgmt, size_t len, 1558 struct ieee80211_rx_status *rx_status) 1559{ 1560 size_t baselen; 1561 struct ieee802_11_elems *elems; 1562 1563 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1564 offsetof(typeof(mgmt->u.beacon), variable)); 1565 1566 /* 1567 * either beacon or probe_resp but the variable field is at the 1568 * same offset 1569 */ 1570 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1571 if (baselen > len) 1572 return; 1573 1574 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1575 len - baselen, false, NULL); 1576 1577 if (elems) { 1578 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1579 kfree(elems); 1580 } 1581} 1582 1583void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1584 struct sk_buff *skb) 1585{ 1586 struct ieee80211_rx_status *rx_status; 1587 struct ieee80211_mgmt *mgmt; 1588 u16 fc; 1589 struct ieee802_11_elems *elems; 1590 int ies_len; 1591 1592 rx_status = IEEE80211_SKB_RXCB(skb); 1593 mgmt = (struct ieee80211_mgmt *) skb->data; 1594 fc = le16_to_cpu(mgmt->frame_control); 1595 1596 if (!sdata->u.ibss.ssid_len) 1597 return; /* not ready to merge yet */ 1598 1599 switch (fc & IEEE80211_FCTL_STYPE) { 1600 case IEEE80211_STYPE_PROBE_REQ: 1601 ieee80211_rx_mgmt_probe_req(sdata, skb); 1602 break; 1603 case IEEE80211_STYPE_PROBE_RESP: 1604 case IEEE80211_STYPE_BEACON: 1605 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1606 rx_status); 1607 break; 1608 case IEEE80211_STYPE_AUTH: 1609 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1610 break; 1611 case IEEE80211_STYPE_DEAUTH: 1612 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1613 break; 1614 case IEEE80211_STYPE_ACTION: 1615 switch (mgmt->u.action.category) { 1616 case WLAN_CATEGORY_SPECTRUM_MGMT: 1617 ies_len = skb->len - 1618 offsetof(struct ieee80211_mgmt, 1619 u.action.u.chan_switch.variable); 1620 1621 if (ies_len < 0) 1622 break; 1623 1624 elems = ieee802_11_parse_elems( 1625 mgmt->u.action.u.chan_switch.variable, 1626 ies_len, true, NULL); 1627 1628 if (elems && !elems->parse_error) 1629 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1630 skb->len, 1631 rx_status, 1632 elems); 1633 kfree(elems); 1634 break; 1635 } 1636 } 1637} 1638 1639void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1640{ 1641 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1642 struct sta_info *sta; 1643 1644 /* 1645 * Work could be scheduled after scan or similar 1646 * when we aren't even joined (or trying) with a 1647 * network. 1648 */ 1649 if (!ifibss->ssid_len) 1650 return; 1651 1652 spin_lock_bh(&ifibss->incomplete_lock); 1653 while (!list_empty(&ifibss->incomplete_stations)) { 1654 sta = list_first_entry(&ifibss->incomplete_stations, 1655 struct sta_info, list); 1656 list_del(&sta->list); 1657 spin_unlock_bh(&ifibss->incomplete_lock); 1658 1659 ieee80211_ibss_finish_sta(sta); 1660 rcu_read_unlock(); 1661 spin_lock_bh(&ifibss->incomplete_lock); 1662 } 1663 spin_unlock_bh(&ifibss->incomplete_lock); 1664 1665 switch (ifibss->state) { 1666 case IEEE80211_IBSS_MLME_SEARCH: 1667 ieee80211_sta_find_ibss(sdata); 1668 break; 1669 case IEEE80211_IBSS_MLME_JOINED: 1670 ieee80211_sta_merge_ibss(sdata); 1671 break; 1672 default: 1673 WARN_ON(1); 1674 break; 1675 } 1676} 1677 1678static void ieee80211_ibss_timer(struct timer_list *t) 1679{ 1680 struct ieee80211_sub_if_data *sdata = 1681 from_timer(sdata, t, u.ibss.timer); 1682 1683 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1684} 1685 1686void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1687{ 1688 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1689 1690 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1691 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1692 spin_lock_init(&ifibss->incomplete_lock); 1693 wiphy_work_init(&ifibss->csa_connection_drop_work, 1694 ieee80211_csa_connection_drop_work); 1695} 1696 1697/* scan finished notification */ 1698void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1699{ 1700 struct ieee80211_sub_if_data *sdata; 1701 1702 lockdep_assert_wiphy(local->hw.wiphy); 1703 1704 list_for_each_entry(sdata, &local->interfaces, list) { 1705 if (!ieee80211_sdata_running(sdata)) 1706 continue; 1707 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1708 continue; 1709 sdata->u.ibss.last_scan_completed = jiffies; 1710 } 1711} 1712 1713int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1714 struct cfg80211_ibss_params *params) 1715{ 1716 u64 changed = 0; 1717 u32 rate_flags; 1718 struct ieee80211_supported_band *sband; 1719 enum ieee80211_chanctx_mode chanmode; 1720 struct ieee80211_local *local = sdata->local; 1721 int radar_detect_width = 0; 1722 int i; 1723 int ret; 1724 1725 lockdep_assert_wiphy(local->hw.wiphy); 1726 1727 if (params->chandef.chan->freq_offset) { 1728 /* this may work, but is untested */ 1729 return -EOPNOTSUPP; 1730 } 1731 1732 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1733 ¶ms->chandef, 1734 sdata->wdev.iftype); 1735 if (ret < 0) 1736 return ret; 1737 1738 if (ret > 0) { 1739 if (!params->userspace_handles_dfs) 1740 return -EINVAL; 1741 radar_detect_width = BIT(params->chandef.width); 1742 } 1743 1744 chanmode = (params->channel_fixed && !ret) ? 1745 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1746 1747 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1748 radar_detect_width); 1749 if (ret < 0) 1750 return ret; 1751 1752 if (params->bssid) { 1753 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1754 sdata->u.ibss.fixed_bssid = true; 1755 } else 1756 sdata->u.ibss.fixed_bssid = false; 1757 1758 sdata->u.ibss.privacy = params->privacy; 1759 sdata->u.ibss.control_port = params->control_port; 1760 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1761 sdata->u.ibss.basic_rates = params->basic_rates; 1762 sdata->u.ibss.last_scan_completed = jiffies; 1763 1764 /* fix basic_rates if channel does not support these rates */ 1765 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1766 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1767 for (i = 0; i < sband->n_bitrates; i++) { 1768 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1769 sdata->u.ibss.basic_rates &= ~BIT(i); 1770 } 1771 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1772 sizeof(params->mcast_rate)); 1773 1774 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1775 1776 sdata->u.ibss.chandef = params->chandef; 1777 sdata->u.ibss.fixed_channel = params->channel_fixed; 1778 1779 if (params->ie) { 1780 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1781 GFP_KERNEL); 1782 if (sdata->u.ibss.ie) 1783 sdata->u.ibss.ie_len = params->ie_len; 1784 } 1785 1786 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1787 sdata->u.ibss.ibss_join_req = jiffies; 1788 1789 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1790 sdata->u.ibss.ssid_len = params->ssid_len; 1791 1792 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1793 sizeof(sdata->u.ibss.ht_capa)); 1794 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1795 sizeof(sdata->u.ibss.ht_capa_mask)); 1796 1797 /* 1798 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1799 * reserved, but an HT STA shall protect HT transmissions as though 1800 * the HT Protection field were set to non-HT mixed mode. 1801 * 1802 * In an IBSS, the RIFS Mode field of the HT Operation element is 1803 * also reserved, but an HT STA shall operate as though this field 1804 * were set to 1. 1805 */ 1806 1807 sdata->vif.bss_conf.ht_operation_mode |= 1808 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1809 | IEEE80211_HT_PARAM_RIFS_MODE; 1810 1811 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1812 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1813 1814 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1815 sdata->deflink.needed_rx_chains = local->rx_chains; 1816 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1817 1818 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1819 1820 return 0; 1821} 1822 1823int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1824{ 1825 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1826 1827 ieee80211_ibss_disconnect(sdata); 1828 ifibss->ssid_len = 0; 1829 eth_zero_addr(ifibss->bssid); 1830 1831 /* remove beacon */ 1832 kfree(sdata->u.ibss.ie); 1833 sdata->u.ibss.ie = NULL; 1834 sdata->u.ibss.ie_len = 0; 1835 1836 /* on the next join, re-program HT parameters */ 1837 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1838 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1839 1840 synchronize_rcu(); 1841 1842 skb_queue_purge(&sdata->skb_queue); 1843 1844 del_timer_sync(&sdata->u.ibss.timer); 1845 1846 return 0; 1847} 1848