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) 2018-2020 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 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->cntdwn_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213error: 214 kfree(presp); 215 return NULL; 216} 217 218static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224{ 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.bss_conf.ibss_joined) { 248 sdata->vif.bss_conf.ibss_joined = false; 249 sdata->vif.bss_conf.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = rcu_dereference_protected(ifibss->presp, 259 lockdep_is_held(&sdata->wdev.mtx)); 260 RCU_INIT_POINTER(ifibss->presp, NULL); 261 if (presp) 262 kfree_rcu(presp, rcu_head); 263 264 /* make a copy of the chandef, it could be modified below. */ 265 chandef = *req_chandef; 266 chan = chandef.chan; 267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 268 NL80211_IFTYPE_ADHOC)) { 269 if (chandef.width == NL80211_CHAN_WIDTH_5 || 270 chandef.width == NL80211_CHAN_WIDTH_10 || 271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 272 chandef.width == NL80211_CHAN_WIDTH_20) { 273 sdata_info(sdata, 274 "Failed to join IBSS, beacons forbidden\n"); 275 return; 276 } 277 chandef.width = NL80211_CHAN_WIDTH_20; 278 chandef.center_freq1 = chan->center_freq; 279 /* check again for downgraded chandef */ 280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 281 NL80211_IFTYPE_ADHOC)) { 282 sdata_info(sdata, 283 "Failed to join IBSS, beacons forbidden\n"); 284 return; 285 } 286 } 287 288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 289 &chandef, NL80211_IFTYPE_ADHOC); 290 if (err < 0) { 291 sdata_info(sdata, 292 "Failed to join IBSS, invalid chandef\n"); 293 return; 294 } 295 if (err > 0 && !ifibss->userspace_handles_dfs) { 296 sdata_info(sdata, 297 "Failed to join IBSS, DFS channel without control program\n"); 298 return; 299 } 300 301 radar_required = err; 302 303 mutex_lock(&local->mtx); 304 if (ieee80211_vif_use_channel(sdata, &chandef, 305 ifibss->fixed_channel ? 306 IEEE80211_CHANCTX_SHARED : 307 IEEE80211_CHANCTX_EXCLUSIVE)) { 308 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 309 mutex_unlock(&local->mtx); 310 return; 311 } 312 sdata->radar_required = radar_required; 313 mutex_unlock(&local->mtx); 314 315 memcpy(ifibss->bssid, bssid, ETH_ALEN); 316 317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 318 capability, tsf, &chandef, 319 &have_higher_than_11mbit, NULL); 320 if (!presp) 321 return; 322 323 rcu_assign_pointer(ifibss->presp, presp); 324 mgmt = (void *)presp->head; 325 326 sdata->vif.bss_conf.enable_beacon = true; 327 sdata->vif.bss_conf.beacon_int = beacon_int; 328 sdata->vif.bss_conf.basic_rates = basic_rates; 329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 331 bss_change = BSS_CHANGED_BEACON_INT; 332 bss_change |= ieee80211_reset_erp_info(sdata); 333 bss_change |= BSS_CHANGED_BSSID; 334 bss_change |= BSS_CHANGED_BEACON; 335 bss_change |= BSS_CHANGED_BEACON_ENABLED; 336 bss_change |= BSS_CHANGED_BASIC_RATES; 337 bss_change |= BSS_CHANGED_HT; 338 bss_change |= BSS_CHANGED_IBSS; 339 bss_change |= BSS_CHANGED_SSID; 340 341 /* 342 * In 5 GHz/802.11a, we can always use short slot time. 343 * (IEEE 802.11-2012 18.3.8.7) 344 * 345 * In 2.4GHz, we must always use long slots in IBSS for compatibility 346 * reasons. 347 * (IEEE 802.11-2012 19.4.5) 348 * 349 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 350 */ 351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395} 396 397static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 398 struct ieee80211_bss *bss) 399{ 400 struct cfg80211_bss *cbss = 401 container_of((void *)bss, struct cfg80211_bss, priv); 402 struct ieee80211_supported_band *sband; 403 struct cfg80211_chan_def chandef; 404 u32 basic_rates; 405 int i, j; 406 u16 beacon_int = cbss->beacon_interval; 407 const struct cfg80211_bss_ies *ies; 408 enum nl80211_channel_type chan_type; 409 u64 tsf; 410 u32 rate_flags; 411 int shift; 412 413 sdata_assert_lock(sdata); 414 415 if (beacon_int < 10) 416 beacon_int = 10; 417 418 switch (sdata->u.ibss.chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 case NL80211_CHAN_WIDTH_40: 422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 424 break; 425 case NL80211_CHAN_WIDTH_5: 426 case NL80211_CHAN_WIDTH_10: 427 cfg80211_chandef_create(&chandef, cbss->channel, 428 NL80211_CHAN_NO_HT); 429 chandef.width = sdata->u.ibss.chandef.width; 430 break; 431 case NL80211_CHAN_WIDTH_80: 432 case NL80211_CHAN_WIDTH_80P80: 433 case NL80211_CHAN_WIDTH_160: 434 chandef = sdata->u.ibss.chandef; 435 chandef.chan = cbss->channel; 436 break; 437 default: 438 /* fall back to 20 MHz for unsupported modes */ 439 cfg80211_chandef_create(&chandef, cbss->channel, 440 NL80211_CHAN_NO_HT); 441 break; 442 } 443 444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 446 shift = ieee80211_vif_get_shift(&sdata->vif); 447 448 basic_rates = 0; 449 450 for (i = 0; i < bss->supp_rates_len; i++) { 451 int rate = bss->supp_rates[i] & 0x7f; 452 bool is_basic = !!(bss->supp_rates[i] & 0x80); 453 454 for (j = 0; j < sband->n_bitrates; j++) { 455 int brate; 456 if ((rate_flags & sband->bitrates[j].flags) 457 != rate_flags) 458 continue; 459 460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 461 5 * (1 << shift)); 462 if (brate == rate) { 463 if (is_basic) 464 basic_rates |= BIT(j); 465 break; 466 } 467 } 468 } 469 470 rcu_read_lock(); 471 ies = rcu_dereference(cbss->ies); 472 tsf = ies->tsf; 473 rcu_read_unlock(); 474 475 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 476 beacon_int, 477 &chandef, 478 basic_rates, 479 cbss->capability, 480 tsf, false); 481} 482 483int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 484 struct cfg80211_csa_settings *csa_settings) 485{ 486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 487 struct beacon_data *presp, *old_presp; 488 struct cfg80211_bss *cbss; 489 const struct cfg80211_bss_ies *ies; 490 u16 capability = WLAN_CAPABILITY_IBSS; 491 u64 tsf; 492 int ret = 0; 493 494 sdata_assert_lock(sdata); 495 496 if (ifibss->privacy) 497 capability |= WLAN_CAPABILITY_PRIVACY; 498 499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 500 ifibss->bssid, ifibss->ssid, 501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 502 IEEE80211_PRIVACY(ifibss->privacy)); 503 504 if (WARN_ON(!cbss)) { 505 ret = -EINVAL; 506 goto out; 507 } 508 509 rcu_read_lock(); 510 ies = rcu_dereference(cbss->ies); 511 tsf = ies->tsf; 512 rcu_read_unlock(); 513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 514 515 old_presp = rcu_dereference_protected(ifibss->presp, 516 lockdep_is_held(&sdata->wdev.mtx)); 517 518 presp = ieee80211_ibss_build_presp(sdata, 519 sdata->vif.bss_conf.beacon_int, 520 sdata->vif.bss_conf.basic_rates, 521 capability, tsf, &ifibss->chandef, 522 NULL, csa_settings); 523 if (!presp) { 524 ret = -ENOMEM; 525 goto out; 526 } 527 528 rcu_assign_pointer(ifibss->presp, presp); 529 if (old_presp) 530 kfree_rcu(old_presp, rcu_head); 531 532 return BSS_CHANGED_BEACON; 533 out: 534 return ret; 535} 536 537int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 538{ 539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 540 struct cfg80211_bss *cbss; 541 542 sdata_assert_lock(sdata); 543 544 /* When not connected/joined, sending CSA doesn't make sense. */ 545 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 546 return -ENOLINK; 547 548 /* update cfg80211 bss information with the new channel */ 549 if (!is_zero_ether_addr(ifibss->bssid)) { 550 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 551 ifibss->chandef.chan, 552 ifibss->bssid, ifibss->ssid, 553 ifibss->ssid_len, 554 IEEE80211_BSS_TYPE_IBSS, 555 IEEE80211_PRIVACY(ifibss->privacy)); 556 /* XXX: should not really modify cfg80211 data */ 557 if (cbss) { 558 cbss->channel = sdata->csa_chandef.chan; 559 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 560 } 561 } 562 563 ifibss->chandef = sdata->csa_chandef; 564 565 /* generate the beacon */ 566 return ieee80211_ibss_csa_beacon(sdata, NULL); 567} 568 569void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 570{ 571 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 572 573 cancel_work_sync(&ifibss->csa_connection_drop_work); 574} 575 576static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 577 __acquires(RCU) 578{ 579 struct ieee80211_sub_if_data *sdata = sta->sdata; 580 u8 addr[ETH_ALEN]; 581 582 memcpy(addr, sta->sta.addr, ETH_ALEN); 583 584 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 585 586 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 587 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 588 /* authorize the station only if the network is not RSN protected. If 589 * not wait for the userspace to authorize it */ 590 if (!sta->sdata->u.ibss.control_port) 591 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 592 593 rate_control_rate_init(sta); 594 595 /* If it fails, maybe we raced another insertion? */ 596 if (sta_info_insert_rcu(sta)) 597 return sta_info_get(sdata, addr); 598 return sta; 599} 600 601static struct sta_info * 602ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 603 const u8 *addr, u32 supp_rates) 604 __acquires(RCU) 605{ 606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 607 struct ieee80211_local *local = sdata->local; 608 struct sta_info *sta; 609 struct ieee80211_chanctx_conf *chanctx_conf; 610 struct ieee80211_supported_band *sband; 611 enum nl80211_bss_scan_width scan_width; 612 int band; 613 614 /* 615 * XXX: Consider removing the least recently used entry and 616 * allow new one to be added. 617 */ 618 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 619 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 620 sdata->name, addr); 621 rcu_read_lock(); 622 return NULL; 623 } 624 625 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 626 rcu_read_lock(); 627 return NULL; 628 } 629 630 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 631 rcu_read_lock(); 632 return NULL; 633 } 634 635 rcu_read_lock(); 636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 637 if (WARN_ON_ONCE(!chanctx_conf)) 638 return NULL; 639 band = chanctx_conf->def.chan->band; 640 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 641 rcu_read_unlock(); 642 643 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 644 if (!sta) { 645 rcu_read_lock(); 646 return NULL; 647 } 648 649 /* make sure mandatory rates are always added */ 650 sband = local->hw.wiphy->bands[band]; 651 sta->sta.supp_rates[band] = supp_rates | 652 ieee80211_mandatory_rates(sband, scan_width); 653 654 return ieee80211_ibss_finish_sta(sta); 655} 656 657static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 658{ 659 struct ieee80211_local *local = sdata->local; 660 int active = 0; 661 struct sta_info *sta; 662 663 sdata_assert_lock(sdata); 664 665 rcu_read_lock(); 666 667 list_for_each_entry_rcu(sta, &local->sta_list, list) { 668 unsigned long last_active = ieee80211_sta_last_active(sta); 669 670 if (sta->sdata == sdata && 671 time_is_after_jiffies(last_active + 672 IEEE80211_IBSS_MERGE_INTERVAL)) { 673 active++; 674 break; 675 } 676 } 677 678 rcu_read_unlock(); 679 680 return active; 681} 682 683static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 684{ 685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 686 struct ieee80211_local *local = sdata->local; 687 struct cfg80211_bss *cbss; 688 struct beacon_data *presp; 689 struct sta_info *sta; 690 691 if (!is_zero_ether_addr(ifibss->bssid)) { 692 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 693 ifibss->bssid, ifibss->ssid, 694 ifibss->ssid_len, 695 IEEE80211_BSS_TYPE_IBSS, 696 IEEE80211_PRIVACY(ifibss->privacy)); 697 698 if (cbss) { 699 cfg80211_unlink_bss(local->hw.wiphy, cbss); 700 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 701 } 702 } 703 704 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 705 706 sta_info_flush(sdata); 707 708 spin_lock_bh(&ifibss->incomplete_lock); 709 while (!list_empty(&ifibss->incomplete_stations)) { 710 sta = list_first_entry(&ifibss->incomplete_stations, 711 struct sta_info, list); 712 list_del(&sta->list); 713 spin_unlock_bh(&ifibss->incomplete_lock); 714 715 sta_info_free(local, sta); 716 spin_lock_bh(&ifibss->incomplete_lock); 717 } 718 spin_unlock_bh(&ifibss->incomplete_lock); 719 720 netif_carrier_off(sdata->dev); 721 722 sdata->vif.bss_conf.ibss_joined = false; 723 sdata->vif.bss_conf.ibss_creator = false; 724 sdata->vif.bss_conf.enable_beacon = false; 725 sdata->vif.bss_conf.ssid_len = 0; 726 727 /* remove beacon */ 728 presp = rcu_dereference_protected(ifibss->presp, 729 lockdep_is_held(&sdata->wdev.mtx)); 730 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 731 if (presp) 732 kfree_rcu(presp, rcu_head); 733 734 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 736 BSS_CHANGED_IBSS); 737 drv_leave_ibss(local, sdata); 738 mutex_lock(&local->mtx); 739 ieee80211_vif_release_channel(sdata); 740 mutex_unlock(&local->mtx); 741} 742 743static void ieee80211_csa_connection_drop_work(struct work_struct *work) 744{ 745 struct ieee80211_sub_if_data *sdata = 746 container_of(work, struct ieee80211_sub_if_data, 747 u.ibss.csa_connection_drop_work); 748 749 sdata_lock(sdata); 750 751 ieee80211_ibss_disconnect(sdata); 752 synchronize_rcu(); 753 skb_queue_purge(&sdata->skb_queue); 754 755 /* trigger a scan to find another IBSS network to join */ 756 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 757 758 sdata_unlock(sdata); 759} 760 761static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 762{ 763 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 764 int err; 765 766 /* if the current channel is a DFS channel, mark the channel as 767 * unavailable. 768 */ 769 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 770 &ifibss->chandef, 771 NL80211_IFTYPE_ADHOC); 772 if (err > 0) 773 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 774 GFP_ATOMIC); 775} 776 777static bool 778ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 779 struct ieee802_11_elems *elems, 780 bool beacon) 781{ 782 struct cfg80211_csa_settings params; 783 struct ieee80211_csa_ie csa_ie; 784 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 785 enum nl80211_channel_type ch_type; 786 int err; 787 u32 sta_flags; 788 u32 vht_cap_info = 0; 789 790 sdata_assert_lock(sdata); 791 792 sta_flags = IEEE80211_STA_DISABLE_VHT; 793 switch (ifibss->chandef.width) { 794 case NL80211_CHAN_WIDTH_5: 795 case NL80211_CHAN_WIDTH_10: 796 case NL80211_CHAN_WIDTH_20_NOHT: 797 sta_flags |= IEEE80211_STA_DISABLE_HT; 798 fallthrough; 799 case NL80211_CHAN_WIDTH_20: 800 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 801 break; 802 default: 803 break; 804 } 805 806 if (elems->vht_cap_elem) 807 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 808 809 memset(¶ms, 0, sizeof(params)); 810 err = ieee80211_parse_ch_switch_ie(sdata, elems, 811 ifibss->chandef.chan->band, 812 vht_cap_info, 813 sta_flags, ifibss->bssid, &csa_ie); 814 /* can't switch to destination channel, fail */ 815 if (err < 0) 816 goto disconnect; 817 818 /* did not contain a CSA */ 819 if (err) 820 return false; 821 822 /* channel switch is not supported, disconnect */ 823 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 824 goto disconnect; 825 826 params.count = csa_ie.count; 827 params.chandef = csa_ie.chandef; 828 829 switch (ifibss->chandef.width) { 830 case NL80211_CHAN_WIDTH_20_NOHT: 831 case NL80211_CHAN_WIDTH_20: 832 case NL80211_CHAN_WIDTH_40: 833 /* keep our current HT mode (HT20/HT40+/HT40-), even if 834 * another mode has been announced. The mode is not adopted 835 * within the beacon while doing CSA and we should therefore 836 * keep the mode which we announce. 837 */ 838 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 839 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 840 ch_type); 841 break; 842 case NL80211_CHAN_WIDTH_5: 843 case NL80211_CHAN_WIDTH_10: 844 if (params.chandef.width != ifibss->chandef.width) { 845 sdata_info(sdata, 846 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 847 ifibss->bssid, 848 params.chandef.chan->center_freq, 849 params.chandef.width, 850 params.chandef.center_freq1, 851 params.chandef.center_freq2); 852 goto disconnect; 853 } 854 break; 855 default: 856 /* should not happen, sta_flags should prevent VHT modes. */ 857 WARN_ON(1); 858 goto disconnect; 859 } 860 861 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 862 NL80211_IFTYPE_ADHOC)) { 863 sdata_info(sdata, 864 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 865 ifibss->bssid, 866 params.chandef.chan->center_freq, 867 params.chandef.width, 868 params.chandef.center_freq1, 869 params.chandef.center_freq2); 870 goto disconnect; 871 } 872 873 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 874 ¶ms.chandef, 875 NL80211_IFTYPE_ADHOC); 876 if (err < 0) 877 goto disconnect; 878 if (err > 0 && !ifibss->userspace_handles_dfs) { 879 /* IBSS-DFS only allowed with a control program */ 880 goto disconnect; 881 } 882 883 params.radar_required = err; 884 885 if (cfg80211_chandef_identical(¶ms.chandef, 886 &sdata->vif.bss_conf.chandef)) { 887 ibss_dbg(sdata, 888 "received csa with an identical chandef, ignoring\n"); 889 return true; 890 } 891 892 /* all checks done, now perform the channel switch. */ 893 ibss_dbg(sdata, 894 "received channel switch announcement to go to channel %d MHz\n", 895 params.chandef.chan->center_freq); 896 897 params.block_tx = !!csa_ie.mode; 898 899 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 900 ¶ms)) 901 goto disconnect; 902 903 ieee80211_ibss_csa_mark_radar(sdata); 904 905 return true; 906disconnect: 907 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 908 ieee80211_queue_work(&sdata->local->hw, 909 &ifibss->csa_connection_drop_work); 910 911 ieee80211_ibss_csa_mark_radar(sdata); 912 913 return true; 914} 915 916static void 917ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 918 struct ieee80211_mgmt *mgmt, size_t len, 919 struct ieee80211_rx_status *rx_status, 920 struct ieee802_11_elems *elems) 921{ 922 int required_len; 923 924 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 925 return; 926 927 /* CSA is the only action we handle for now */ 928 if (mgmt->u.action.u.measurement.action_code != 929 WLAN_ACTION_SPCT_CHL_SWITCH) 930 return; 931 932 required_len = IEEE80211_MIN_ACTION_SIZE + 933 sizeof(mgmt->u.action.u.chan_switch); 934 if (len < required_len) 935 return; 936 937 if (!sdata->vif.csa_active) 938 ieee80211_ibss_process_chanswitch(sdata, elems, false); 939} 940 941static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 942 struct ieee80211_mgmt *mgmt, 943 size_t len) 944{ 945 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 946 947 if (len < IEEE80211_DEAUTH_FRAME_LEN) 948 return; 949 950 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 951 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 952 sta_info_destroy_addr(sdata, mgmt->sa); 953} 954 955static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 956 struct ieee80211_mgmt *mgmt, 957 size_t len) 958{ 959 u16 auth_alg, auth_transaction; 960 961 sdata_assert_lock(sdata); 962 963 if (len < 24 + 6) 964 return; 965 966 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 967 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 968 969 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 970 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 971 mgmt->bssid, auth_transaction); 972 973 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 974 return; 975 976 /* 977 * IEEE 802.11 standard does not require authentication in IBSS 978 * networks and most implementations do not seem to use it. 979 * However, try to reply to authentication attempts if someone 980 * has actually implemented this. 981 */ 982 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 983 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 984} 985 986static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 987 struct ieee80211_mgmt *mgmt, size_t len, 988 struct ieee80211_rx_status *rx_status, 989 struct ieee802_11_elems *elems, 990 struct ieee80211_channel *channel) 991{ 992 struct sta_info *sta; 993 enum nl80211_band band = rx_status->band; 994 enum nl80211_bss_scan_width scan_width; 995 struct ieee80211_local *local = sdata->local; 996 struct ieee80211_supported_band *sband; 997 bool rates_updated = false; 998 u32 supp_rates = 0; 999 1000 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1001 return; 1002 1003 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1004 return; 1005 1006 sband = local->hw.wiphy->bands[band]; 1007 if (WARN_ON(!sband)) 1008 return; 1009 1010 rcu_read_lock(); 1011 sta = sta_info_get(sdata, mgmt->sa); 1012 1013 if (elems->supp_rates) { 1014 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1015 band, NULL); 1016 if (sta) { 1017 u32 prev_rates; 1018 1019 prev_rates = sta->sta.supp_rates[band]; 1020 /* make sure mandatory rates are always added */ 1021 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1022 if (rx_status->bw == RATE_INFO_BW_5) 1023 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1024 else if (rx_status->bw == RATE_INFO_BW_10) 1025 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1026 1027 sta->sta.supp_rates[band] = supp_rates | 1028 ieee80211_mandatory_rates(sband, scan_width); 1029 if (sta->sta.supp_rates[band] != prev_rates) { 1030 ibss_dbg(sdata, 1031 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1032 sta->sta.addr, prev_rates, 1033 sta->sta.supp_rates[band]); 1034 rates_updated = true; 1035 } 1036 } else { 1037 rcu_read_unlock(); 1038 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1039 mgmt->sa, supp_rates); 1040 } 1041 } 1042 1043 if (sta && !sta->sta.wme && 1044 (elems->wmm_info || elems->s1g_capab) && 1045 local->hw.queues >= IEEE80211_NUM_ACS) { 1046 sta->sta.wme = true; 1047 ieee80211_check_fast_xmit(sta); 1048 } 1049 1050 if (sta && elems->ht_operation && elems->ht_cap_elem && 1051 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1054 /* we both use HT */ 1055 struct ieee80211_ht_cap htcap_ie; 1056 struct cfg80211_chan_def chandef; 1057 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1058 1059 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1060 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1061 1062 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1063 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1064 &htcap_ie, 1065 sta); 1066 1067 if (elems->vht_operation && elems->vht_cap_elem && 1068 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1069 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1070 /* we both use VHT */ 1071 struct ieee80211_vht_cap cap_ie; 1072 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1073 u32 vht_cap_info = 1074 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1075 1076 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1077 elems->vht_operation, 1078 elems->ht_operation, 1079 &chandef); 1080 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1081 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1082 &cap_ie, sta); 1083 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1084 rates_updated |= true; 1085 } 1086 1087 if (bw != sta->sta.bandwidth) 1088 rates_updated |= true; 1089 1090 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1091 &chandef)) 1092 WARN_ON_ONCE(1); 1093 } 1094 1095 if (sta && rates_updated) { 1096 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1097 u8 rx_nss = sta->sta.rx_nss; 1098 1099 /* Force rx_nss recalculation */ 1100 sta->sta.rx_nss = 0; 1101 rate_control_rate_init(sta); 1102 if (sta->sta.rx_nss != rx_nss) 1103 changed |= IEEE80211_RC_NSS_CHANGED; 1104 1105 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1106 } 1107 1108 rcu_read_unlock(); 1109} 1110 1111static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1112 struct ieee80211_mgmt *mgmt, size_t len, 1113 struct ieee80211_rx_status *rx_status, 1114 struct ieee802_11_elems *elems) 1115{ 1116 struct ieee80211_local *local = sdata->local; 1117 struct cfg80211_bss *cbss; 1118 struct ieee80211_bss *bss; 1119 struct ieee80211_channel *channel; 1120 u64 beacon_timestamp, rx_timestamp; 1121 u32 supp_rates = 0; 1122 enum nl80211_band band = rx_status->band; 1123 1124 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1125 if (!channel) 1126 return; 1127 1128 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1129 1130 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1131 if (!bss) 1132 return; 1133 1134 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1135 1136 /* same for beacon and probe response */ 1137 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1138 1139 /* check if we need to merge IBSS */ 1140 1141 /* not an IBSS */ 1142 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1143 goto put_bss; 1144 1145 /* different channel */ 1146 if (sdata->u.ibss.fixed_channel && 1147 sdata->u.ibss.chandef.chan != cbss->channel) 1148 goto put_bss; 1149 1150 /* different SSID */ 1151 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1152 memcmp(elems->ssid, sdata->u.ibss.ssid, 1153 sdata->u.ibss.ssid_len)) 1154 goto put_bss; 1155 1156 /* process channel switch */ 1157 if (sdata->vif.csa_active || 1158 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1159 goto put_bss; 1160 1161 /* same BSSID */ 1162 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1163 goto put_bss; 1164 1165 /* we use a fixed BSSID */ 1166 if (sdata->u.ibss.fixed_bssid) 1167 goto put_bss; 1168 1169 if (ieee80211_have_rx_timestamp(rx_status)) { 1170 /* time when timestamp field was received */ 1171 rx_timestamp = 1172 ieee80211_calculate_rx_timestamp(local, rx_status, 1173 len + FCS_LEN, 24); 1174 } else { 1175 /* 1176 * second best option: get current TSF 1177 * (will return -1 if not supported) 1178 */ 1179 rx_timestamp = drv_get_tsf(local, sdata); 1180 } 1181 1182 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1183 mgmt->sa, mgmt->bssid, 1184 (unsigned long long)rx_timestamp); 1185 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1186 (unsigned long long)beacon_timestamp, 1187 (unsigned long long)(rx_timestamp - beacon_timestamp), 1188 jiffies); 1189 1190 if (beacon_timestamp > rx_timestamp) { 1191 ibss_dbg(sdata, 1192 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1193 mgmt->bssid); 1194 ieee80211_sta_join_ibss(sdata, bss); 1195 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1196 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1197 supp_rates); 1198 rcu_read_unlock(); 1199 } 1200 1201 put_bss: 1202 ieee80211_rx_bss_put(local, bss); 1203} 1204 1205void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1206 const u8 *bssid, const u8 *addr, 1207 u32 supp_rates) 1208{ 1209 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1210 struct ieee80211_local *local = sdata->local; 1211 struct sta_info *sta; 1212 struct ieee80211_chanctx_conf *chanctx_conf; 1213 struct ieee80211_supported_band *sband; 1214 enum nl80211_bss_scan_width scan_width; 1215 int band; 1216 1217 /* 1218 * XXX: Consider removing the least recently used entry and 1219 * allow new one to be added. 1220 */ 1221 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1222 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1223 sdata->name, addr); 1224 return; 1225 } 1226 1227 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1228 return; 1229 1230 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1231 return; 1232 1233 rcu_read_lock(); 1234 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1235 if (WARN_ON_ONCE(!chanctx_conf)) { 1236 rcu_read_unlock(); 1237 return; 1238 } 1239 band = chanctx_conf->def.chan->band; 1240 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1241 rcu_read_unlock(); 1242 1243 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1244 if (!sta) 1245 return; 1246 1247 /* make sure mandatory rates are always added */ 1248 sband = local->hw.wiphy->bands[band]; 1249 sta->sta.supp_rates[band] = supp_rates | 1250 ieee80211_mandatory_rates(sband, scan_width); 1251 1252 spin_lock(&ifibss->incomplete_lock); 1253 list_add(&sta->list, &ifibss->incomplete_stations); 1254 spin_unlock(&ifibss->incomplete_lock); 1255 ieee80211_queue_work(&local->hw, &sdata->work); 1256} 1257 1258static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1259{ 1260 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1261 struct ieee80211_local *local = sdata->local; 1262 struct sta_info *sta, *tmp; 1263 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1264 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1265 1266 mutex_lock(&local->sta_mtx); 1267 1268 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1269 unsigned long last_active = ieee80211_sta_last_active(sta); 1270 1271 if (sdata != sta->sdata) 1272 continue; 1273 1274 if (time_is_before_jiffies(last_active + exp_time) || 1275 (time_is_before_jiffies(last_active + exp_rsn) && 1276 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1277 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1278 1279 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1280 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1281 "not authorized " : "", sta->sta.addr); 1282 1283 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1284 ifibss->bssid, 1285 IEEE80211_STYPE_DEAUTH, 1286 WLAN_REASON_DEAUTH_LEAVING, 1287 true, frame_buf); 1288 WARN_ON(__sta_info_destroy(sta)); 1289 } 1290 } 1291 1292 mutex_unlock(&local->sta_mtx); 1293} 1294 1295/* 1296 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1297 */ 1298 1299static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1300{ 1301 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1302 enum nl80211_bss_scan_width scan_width; 1303 1304 sdata_assert_lock(sdata); 1305 1306 mod_timer(&ifibss->timer, 1307 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1308 1309 ieee80211_ibss_sta_expire(sdata); 1310 1311 if (time_before(jiffies, ifibss->last_scan_completed + 1312 IEEE80211_IBSS_MERGE_INTERVAL)) 1313 return; 1314 1315 if (ieee80211_sta_active_ibss(sdata)) 1316 return; 1317 1318 if (ifibss->fixed_channel) 1319 return; 1320 1321 sdata_info(sdata, 1322 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1323 1324 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1325 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1326 NULL, 0, scan_width); 1327} 1328 1329static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1330{ 1331 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1332 u8 bssid[ETH_ALEN]; 1333 u16 capability; 1334 int i; 1335 1336 sdata_assert_lock(sdata); 1337 1338 if (ifibss->fixed_bssid) { 1339 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1340 } else { 1341 /* Generate random, not broadcast, locally administered BSSID. Mix in 1342 * own MAC address to make sure that devices that do not have proper 1343 * random number generator get different BSSID. */ 1344 get_random_bytes(bssid, ETH_ALEN); 1345 for (i = 0; i < ETH_ALEN; i++) 1346 bssid[i] ^= sdata->vif.addr[i]; 1347 bssid[0] &= ~0x01; 1348 bssid[0] |= 0x02; 1349 } 1350 1351 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1352 1353 capability = WLAN_CAPABILITY_IBSS; 1354 1355 if (ifibss->privacy) 1356 capability |= WLAN_CAPABILITY_PRIVACY; 1357 1358 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1359 &ifibss->chandef, ifibss->basic_rates, 1360 capability, 0, true); 1361} 1362 1363static unsigned ibss_setup_channels(struct wiphy *wiphy, 1364 struct ieee80211_channel **channels, 1365 unsigned int channels_max, 1366 u32 center_freq, u32 width) 1367{ 1368 struct ieee80211_channel *chan = NULL; 1369 unsigned int n_chan = 0; 1370 u32 start_freq, end_freq, freq; 1371 1372 if (width <= 20) { 1373 start_freq = center_freq; 1374 end_freq = center_freq; 1375 } else { 1376 start_freq = center_freq - width / 2 + 10; 1377 end_freq = center_freq + width / 2 - 10; 1378 } 1379 1380 for (freq = start_freq; freq <= end_freq; freq += 20) { 1381 chan = ieee80211_get_channel(wiphy, freq); 1382 if (!chan) 1383 continue; 1384 if (n_chan >= channels_max) 1385 return n_chan; 1386 1387 channels[n_chan] = chan; 1388 n_chan++; 1389 } 1390 1391 return n_chan; 1392} 1393 1394static unsigned int 1395ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1396 const struct cfg80211_chan_def *chandef, 1397 struct ieee80211_channel **channels, 1398 unsigned int channels_max) 1399{ 1400 unsigned int n_chan = 0; 1401 u32 width, cf1, cf2 = 0; 1402 1403 switch (chandef->width) { 1404 case NL80211_CHAN_WIDTH_40: 1405 width = 40; 1406 break; 1407 case NL80211_CHAN_WIDTH_80P80: 1408 cf2 = chandef->center_freq2; 1409 fallthrough; 1410 case NL80211_CHAN_WIDTH_80: 1411 width = 80; 1412 break; 1413 case NL80211_CHAN_WIDTH_160: 1414 width = 160; 1415 break; 1416 default: 1417 width = 20; 1418 break; 1419 } 1420 1421 cf1 = chandef->center_freq1; 1422 1423 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1424 1425 if (cf2) 1426 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1427 channels_max - n_chan, cf2, 1428 width); 1429 1430 return n_chan; 1431} 1432 1433/* 1434 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1435 */ 1436 1437static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1438{ 1439 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1440 struct ieee80211_local *local = sdata->local; 1441 struct cfg80211_bss *cbss; 1442 struct ieee80211_channel *chan = NULL; 1443 const u8 *bssid = NULL; 1444 enum nl80211_bss_scan_width scan_width; 1445 int active_ibss; 1446 1447 sdata_assert_lock(sdata); 1448 1449 active_ibss = ieee80211_sta_active_ibss(sdata); 1450 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1451 1452 if (active_ibss) 1453 return; 1454 1455 if (ifibss->fixed_bssid) 1456 bssid = ifibss->bssid; 1457 if (ifibss->fixed_channel) 1458 chan = ifibss->chandef.chan; 1459 if (!is_zero_ether_addr(ifibss->bssid)) 1460 bssid = ifibss->bssid; 1461 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1462 ifibss->ssid, ifibss->ssid_len, 1463 IEEE80211_BSS_TYPE_IBSS, 1464 IEEE80211_PRIVACY(ifibss->privacy)); 1465 1466 if (cbss) { 1467 struct ieee80211_bss *bss; 1468 1469 bss = (void *)cbss->priv; 1470 ibss_dbg(sdata, 1471 "sta_find_ibss: selected %pM current %pM\n", 1472 cbss->bssid, ifibss->bssid); 1473 sdata_info(sdata, 1474 "Selected IBSS BSSID %pM based on configured SSID\n", 1475 cbss->bssid); 1476 1477 ieee80211_sta_join_ibss(sdata, bss); 1478 ieee80211_rx_bss_put(local, bss); 1479 return; 1480 } 1481 1482 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1483 * directly and do not waste time scanning 1484 */ 1485 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1486 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1487 bssid); 1488 ieee80211_sta_create_ibss(sdata); 1489 return; 1490 } 1491 1492 1493 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1494 1495 /* Selected IBSS not found in current scan results - try to scan */ 1496 if (time_after(jiffies, ifibss->last_scan_completed + 1497 IEEE80211_SCAN_INTERVAL)) { 1498 struct ieee80211_channel *channels[8]; 1499 unsigned int num; 1500 1501 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1502 1503 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1504 1505 if (ifibss->fixed_channel) { 1506 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1507 &ifibss->chandef, 1508 channels, 1509 ARRAY_SIZE(channels)); 1510 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1511 ifibss->ssid_len, channels, 1512 num, scan_width); 1513 } else { 1514 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1515 ifibss->ssid_len, NULL, 1516 0, scan_width); 1517 } 1518 } else { 1519 int interval = IEEE80211_SCAN_INTERVAL; 1520 1521 if (time_after(jiffies, ifibss->ibss_join_req + 1522 IEEE80211_IBSS_JOIN_TIMEOUT)) 1523 ieee80211_sta_create_ibss(sdata); 1524 1525 mod_timer(&ifibss->timer, 1526 round_jiffies(jiffies + interval)); 1527 } 1528} 1529 1530static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1531 struct sk_buff *req) 1532{ 1533 struct ieee80211_mgmt *mgmt = (void *)req->data; 1534 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1535 struct ieee80211_local *local = sdata->local; 1536 int tx_last_beacon, len = req->len; 1537 struct sk_buff *skb; 1538 struct beacon_data *presp; 1539 u8 *pos, *end; 1540 1541 sdata_assert_lock(sdata); 1542 1543 presp = rcu_dereference_protected(ifibss->presp, 1544 lockdep_is_held(&sdata->wdev.mtx)); 1545 1546 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1547 len < 24 + 2 || !presp) 1548 return; 1549 1550 tx_last_beacon = drv_tx_last_beacon(local); 1551 1552 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1553 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1554 mgmt->bssid, tx_last_beacon); 1555 1556 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1557 return; 1558 1559 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1560 !is_broadcast_ether_addr(mgmt->bssid)) 1561 return; 1562 1563 end = ((u8 *) mgmt) + len; 1564 pos = mgmt->u.probe_req.variable; 1565 if (pos[0] != WLAN_EID_SSID || 1566 pos + 2 + pos[1] > end) { 1567 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1568 mgmt->sa); 1569 return; 1570 } 1571 if (pos[1] != 0 && 1572 (pos[1] != ifibss->ssid_len || 1573 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1574 /* Ignore ProbeReq for foreign SSID */ 1575 return; 1576 } 1577 1578 /* Reply with ProbeResp */ 1579 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1580 if (!skb) 1581 return; 1582 1583 skb_reserve(skb, local->tx_headroom); 1584 skb_put_data(skb, presp->head, presp->head_len); 1585 1586 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1587 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1588 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1589 1590 /* avoid excessive retries for probe request to wildcard SSIDs */ 1591 if (pos[1] == 0) 1592 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1593 1594 ieee80211_tx_skb(sdata, skb); 1595} 1596 1597static 1598void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1599 struct ieee80211_mgmt *mgmt, size_t len, 1600 struct ieee80211_rx_status *rx_status) 1601{ 1602 size_t baselen; 1603 struct ieee802_11_elems elems; 1604 1605 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1606 offsetof(typeof(mgmt->u.beacon), variable)); 1607 1608 /* 1609 * either beacon or probe_resp but the variable field is at the 1610 * same offset 1611 */ 1612 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1613 if (baselen > len) 1614 return; 1615 1616 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1617 false, &elems, mgmt->bssid, NULL); 1618 1619 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1620} 1621 1622void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1623 struct sk_buff *skb) 1624{ 1625 struct ieee80211_rx_status *rx_status; 1626 struct ieee80211_mgmt *mgmt; 1627 u16 fc; 1628 struct ieee802_11_elems elems; 1629 int ies_len; 1630 1631 rx_status = IEEE80211_SKB_RXCB(skb); 1632 mgmt = (struct ieee80211_mgmt *) skb->data; 1633 fc = le16_to_cpu(mgmt->frame_control); 1634 1635 sdata_lock(sdata); 1636 1637 if (!sdata->u.ibss.ssid_len) 1638 goto mgmt_out; /* not ready to merge yet */ 1639 1640 switch (fc & IEEE80211_FCTL_STYPE) { 1641 case IEEE80211_STYPE_PROBE_REQ: 1642 ieee80211_rx_mgmt_probe_req(sdata, skb); 1643 break; 1644 case IEEE80211_STYPE_PROBE_RESP: 1645 case IEEE80211_STYPE_BEACON: 1646 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1647 rx_status); 1648 break; 1649 case IEEE80211_STYPE_AUTH: 1650 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1651 break; 1652 case IEEE80211_STYPE_DEAUTH: 1653 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1654 break; 1655 case IEEE80211_STYPE_ACTION: 1656 switch (mgmt->u.action.category) { 1657 case WLAN_CATEGORY_SPECTRUM_MGMT: 1658 ies_len = skb->len - 1659 offsetof(struct ieee80211_mgmt, 1660 u.action.u.chan_switch.variable); 1661 1662 if (ies_len < 0) 1663 break; 1664 1665 ieee802_11_parse_elems( 1666 mgmt->u.action.u.chan_switch.variable, 1667 ies_len, true, &elems, mgmt->bssid, NULL); 1668 1669 if (elems.parse_error) 1670 break; 1671 1672 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1673 rx_status, &elems); 1674 break; 1675 } 1676 } 1677 1678 mgmt_out: 1679 sdata_unlock(sdata); 1680} 1681 1682void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1683{ 1684 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1685 struct sta_info *sta; 1686 1687 sdata_lock(sdata); 1688 1689 /* 1690 * Work could be scheduled after scan or similar 1691 * when we aren't even joined (or trying) with a 1692 * network. 1693 */ 1694 if (!ifibss->ssid_len) 1695 goto out; 1696 1697 spin_lock_bh(&ifibss->incomplete_lock); 1698 while (!list_empty(&ifibss->incomplete_stations)) { 1699 sta = list_first_entry(&ifibss->incomplete_stations, 1700 struct sta_info, list); 1701 list_del(&sta->list); 1702 spin_unlock_bh(&ifibss->incomplete_lock); 1703 1704 ieee80211_ibss_finish_sta(sta); 1705 rcu_read_unlock(); 1706 spin_lock_bh(&ifibss->incomplete_lock); 1707 } 1708 spin_unlock_bh(&ifibss->incomplete_lock); 1709 1710 switch (ifibss->state) { 1711 case IEEE80211_IBSS_MLME_SEARCH: 1712 ieee80211_sta_find_ibss(sdata); 1713 break; 1714 case IEEE80211_IBSS_MLME_JOINED: 1715 ieee80211_sta_merge_ibss(sdata); 1716 break; 1717 default: 1718 WARN_ON(1); 1719 break; 1720 } 1721 1722 out: 1723 sdata_unlock(sdata); 1724} 1725 1726static void ieee80211_ibss_timer(struct timer_list *t) 1727{ 1728 struct ieee80211_sub_if_data *sdata = 1729 from_timer(sdata, t, u.ibss.timer); 1730 1731 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1732} 1733 1734void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1735{ 1736 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1737 1738 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1739 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1740 spin_lock_init(&ifibss->incomplete_lock); 1741 INIT_WORK(&ifibss->csa_connection_drop_work, 1742 ieee80211_csa_connection_drop_work); 1743} 1744 1745/* scan finished notification */ 1746void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1747{ 1748 struct ieee80211_sub_if_data *sdata; 1749 1750 mutex_lock(&local->iflist_mtx); 1751 list_for_each_entry(sdata, &local->interfaces, list) { 1752 if (!ieee80211_sdata_running(sdata)) 1753 continue; 1754 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1755 continue; 1756 sdata->u.ibss.last_scan_completed = jiffies; 1757 } 1758 mutex_unlock(&local->iflist_mtx); 1759} 1760 1761int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1762 struct cfg80211_ibss_params *params) 1763{ 1764 u32 changed = 0; 1765 u32 rate_flags; 1766 struct ieee80211_supported_band *sband; 1767 enum ieee80211_chanctx_mode chanmode; 1768 struct ieee80211_local *local = sdata->local; 1769 int radar_detect_width = 0; 1770 int i; 1771 int ret; 1772 1773 if (params->chandef.chan->freq_offset) { 1774 /* this may work, but is untested */ 1775 return -EOPNOTSUPP; 1776 } 1777 1778 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1779 ¶ms->chandef, 1780 sdata->wdev.iftype); 1781 if (ret < 0) 1782 return ret; 1783 1784 if (ret > 0) { 1785 if (!params->userspace_handles_dfs) 1786 return -EINVAL; 1787 radar_detect_width = BIT(params->chandef.width); 1788 } 1789 1790 chanmode = (params->channel_fixed && !ret) ? 1791 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1792 1793 mutex_lock(&local->chanctx_mtx); 1794 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1795 radar_detect_width); 1796 mutex_unlock(&local->chanctx_mtx); 1797 if (ret < 0) 1798 return ret; 1799 1800 if (params->bssid) { 1801 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1802 sdata->u.ibss.fixed_bssid = true; 1803 } else 1804 sdata->u.ibss.fixed_bssid = false; 1805 1806 sdata->u.ibss.privacy = params->privacy; 1807 sdata->u.ibss.control_port = params->control_port; 1808 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1809 sdata->u.ibss.basic_rates = params->basic_rates; 1810 sdata->u.ibss.last_scan_completed = jiffies; 1811 1812 /* fix basic_rates if channel does not support these rates */ 1813 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1814 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1815 for (i = 0; i < sband->n_bitrates; i++) { 1816 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1817 sdata->u.ibss.basic_rates &= ~BIT(i); 1818 } 1819 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1820 sizeof(params->mcast_rate)); 1821 1822 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1823 1824 sdata->u.ibss.chandef = params->chandef; 1825 sdata->u.ibss.fixed_channel = params->channel_fixed; 1826 1827 if (params->ie) { 1828 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1829 GFP_KERNEL); 1830 if (sdata->u.ibss.ie) 1831 sdata->u.ibss.ie_len = params->ie_len; 1832 } 1833 1834 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1835 sdata->u.ibss.ibss_join_req = jiffies; 1836 1837 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1838 sdata->u.ibss.ssid_len = params->ssid_len; 1839 1840 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1841 sizeof(sdata->u.ibss.ht_capa)); 1842 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1843 sizeof(sdata->u.ibss.ht_capa_mask)); 1844 1845 /* 1846 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1847 * reserved, but an HT STA shall protect HT transmissions as though 1848 * the HT Protection field were set to non-HT mixed mode. 1849 * 1850 * In an IBSS, the RIFS Mode field of the HT Operation element is 1851 * also reserved, but an HT STA shall operate as though this field 1852 * were set to 1. 1853 */ 1854 1855 sdata->vif.bss_conf.ht_operation_mode |= 1856 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1857 | IEEE80211_HT_PARAM_RIFS_MODE; 1858 1859 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1860 ieee80211_bss_info_change_notify(sdata, changed); 1861 1862 sdata->smps_mode = IEEE80211_SMPS_OFF; 1863 sdata->needed_rx_chains = local->rx_chains; 1864 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1865 1866 ieee80211_queue_work(&local->hw, &sdata->work); 1867 1868 return 0; 1869} 1870 1871int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1872{ 1873 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1874 1875 ieee80211_ibss_disconnect(sdata); 1876 ifibss->ssid_len = 0; 1877 eth_zero_addr(ifibss->bssid); 1878 1879 /* remove beacon */ 1880 kfree(sdata->u.ibss.ie); 1881 sdata->u.ibss.ie = NULL; 1882 sdata->u.ibss.ie_len = 0; 1883 1884 /* on the next join, re-program HT parameters */ 1885 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1886 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1887 1888 synchronize_rcu(); 1889 1890 skb_queue_purge(&sdata->skb_queue); 1891 1892 del_timer_sync(&sdata->u.ibss.timer); 1893 1894 return 0; 1895} 1896