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 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rate_flags, rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->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; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224 { 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.bss_conf.ibss_joined) { 248 sdata->vif.bss_conf.ibss_joined = false; 249 sdata->vif.bss_conf.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = rcu_dereference_protected(ifibss->presp, 259 lockdep_is_held(&sdata->wdev.mtx)); 260 RCU_INIT_POINTER(ifibss->presp, NULL); 261 if (presp) 262 kfree_rcu(presp, rcu_head); 263 264 /* make a copy of the chandef, it could be modified below. */ 265 chandef = *req_chandef; 266 chan = chandef.chan; 267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 268 NL80211_IFTYPE_ADHOC)) { 269 if (chandef.width == NL80211_CHAN_WIDTH_5 || 270 chandef.width == NL80211_CHAN_WIDTH_10 || 271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 272 chandef.width == NL80211_CHAN_WIDTH_20) { 273 sdata_info(sdata, 274 "Failed to join IBSS, beacons forbidden\n"); 275 return; 276 } 277 chandef.width = NL80211_CHAN_WIDTH_20; 278 chandef.center_freq1 = chan->center_freq; 279 /* check again for downgraded chandef */ 280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 281 NL80211_IFTYPE_ADHOC)) { 282 sdata_info(sdata, 283 "Failed to join IBSS, beacons forbidden\n"); 284 return; 285 } 286 } 287 288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 289 &chandef, NL80211_IFTYPE_ADHOC); 290 if (err < 0) { 291 sdata_info(sdata, 292 "Failed to join IBSS, invalid chandef\n"); 293 return; 294 } 295 if (err > 0 && !ifibss->userspace_handles_dfs) { 296 sdata_info(sdata, 297 "Failed to join IBSS, DFS channel without control program\n"); 298 return; 299 } 300 301 radar_required = err; 302 303 mutex_lock(&local->mtx); 304 if (ieee80211_vif_use_channel(sdata, &chandef, 305 ifibss->fixed_channel ? 306 IEEE80211_CHANCTX_SHARED : 307 IEEE80211_CHANCTX_EXCLUSIVE)) { 308 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 309 mutex_unlock(&local->mtx); 310 return; 311 } 312 sdata->radar_required = radar_required; 313 mutex_unlock(&local->mtx); 314 315 memcpy(ifibss->bssid, bssid, ETH_ALEN); 316 317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 318 capability, tsf, &chandef, 319 &have_higher_than_11mbit, NULL); 320 if (!presp) 321 return; 322 323 rcu_assign_pointer(ifibss->presp, presp); 324 mgmt = (void *)presp->head; 325 326 sdata->vif.bss_conf.enable_beacon = true; 327 sdata->vif.bss_conf.beacon_int = beacon_int; 328 sdata->vif.bss_conf.basic_rates = basic_rates; 329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 331 bss_change = BSS_CHANGED_BEACON_INT; 332 bss_change |= ieee80211_reset_erp_info(sdata); 333 bss_change |= BSS_CHANGED_BSSID; 334 bss_change |= BSS_CHANGED_BEACON; 335 bss_change |= BSS_CHANGED_BEACON_ENABLED; 336 bss_change |= BSS_CHANGED_BASIC_RATES; 337 bss_change |= BSS_CHANGED_HT; 338 bss_change |= BSS_CHANGED_IBSS; 339 bss_change |= BSS_CHANGED_SSID; 340 341 /* 342 * In 5 GHz/802.11a, we can always use short slot time. 343 * (IEEE 802.11-2012 18.3.8.7) 344 * 345 * In 2.4GHz, we must always use long slots in IBSS for compatibility 346 * reasons. 347 * (IEEE 802.11-2012 19.4.5) 348 * 349 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 350 */ 351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395 } 396 397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 398 struct ieee80211_bss *bss) 399 { 400 struct cfg80211_bss *cbss = 401 container_of((void *)bss, struct cfg80211_bss, priv); 402 struct ieee80211_supported_band *sband; 403 struct cfg80211_chan_def chandef; 404 u32 basic_rates; 405 int i, j; 406 u16 beacon_int = cbss->beacon_interval; 407 const struct cfg80211_bss_ies *ies; 408 enum nl80211_channel_type chan_type; 409 u64 tsf; 410 u32 rate_flags; 411 int shift; 412 413 sdata_assert_lock(sdata); 414 415 if (beacon_int < 10) 416 beacon_int = 10; 417 418 switch (sdata->u.ibss.chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 case NL80211_CHAN_WIDTH_40: 422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 424 break; 425 case NL80211_CHAN_WIDTH_5: 426 case NL80211_CHAN_WIDTH_10: 427 cfg80211_chandef_create(&chandef, cbss->channel, 428 NL80211_CHAN_NO_HT); 429 chandef.width = sdata->u.ibss.chandef.width; 430 break; 431 case NL80211_CHAN_WIDTH_80: 432 case NL80211_CHAN_WIDTH_80P80: 433 case NL80211_CHAN_WIDTH_160: 434 chandef = sdata->u.ibss.chandef; 435 chandef.chan = cbss->channel; 436 break; 437 default: 438 /* fall back to 20 MHz for unsupported modes */ 439 cfg80211_chandef_create(&chandef, cbss->channel, 440 NL80211_CHAN_NO_HT); 441 break; 442 } 443 444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 446 shift = ieee80211_vif_get_shift(&sdata->vif); 447 448 basic_rates = 0; 449 450 for (i = 0; i < bss->supp_rates_len; i++) { 451 int rate = bss->supp_rates[i] & 0x7f; 452 bool is_basic = !!(bss->supp_rates[i] & 0x80); 453 454 for (j = 0; j < sband->n_bitrates; j++) { 455 int brate; 456 if ((rate_flags & sband->bitrates[j].flags) 457 != rate_flags) 458 continue; 459 460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 461 5 * (1 << shift)); 462 if (brate == rate) { 463 if (is_basic) 464 basic_rates |= BIT(j); 465 break; 466 } 467 } 468 } 469 470 rcu_read_lock(); 471 ies = rcu_dereference(cbss->ies); 472 tsf = ies->tsf; 473 rcu_read_unlock(); 474 475 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 476 beacon_int, 477 &chandef, 478 basic_rates, 479 cbss->capability, 480 tsf, false); 481 } 482 483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 484 struct cfg80211_csa_settings *csa_settings) 485 { 486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 487 struct beacon_data *presp, *old_presp; 488 struct cfg80211_bss *cbss; 489 const struct cfg80211_bss_ies *ies; 490 u16 capability = WLAN_CAPABILITY_IBSS; 491 u64 tsf; 492 int ret = 0; 493 494 sdata_assert_lock(sdata); 495 496 if (ifibss->privacy) 497 capability |= WLAN_CAPABILITY_PRIVACY; 498 499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 500 ifibss->bssid, ifibss->ssid, 501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 502 IEEE80211_PRIVACY(ifibss->privacy)); 503 504 if (WARN_ON(!cbss)) { 505 ret = -EINVAL; 506 goto out; 507 } 508 509 rcu_read_lock(); 510 ies = rcu_dereference(cbss->ies); 511 tsf = ies->tsf; 512 rcu_read_unlock(); 513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 514 515 old_presp = rcu_dereference_protected(ifibss->presp, 516 lockdep_is_held(&sdata->wdev.mtx)); 517 518 presp = ieee80211_ibss_build_presp(sdata, 519 sdata->vif.bss_conf.beacon_int, 520 sdata->vif.bss_conf.basic_rates, 521 capability, tsf, &ifibss->chandef, 522 NULL, csa_settings); 523 if (!presp) { 524 ret = -ENOMEM; 525 goto out; 526 } 527 528 rcu_assign_pointer(ifibss->presp, presp); 529 if (old_presp) 530 kfree_rcu(old_presp, rcu_head); 531 532 return BSS_CHANGED_BEACON; 533 out: 534 return ret; 535 } 536 537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 538 { 539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 540 struct cfg80211_bss *cbss; 541 542 sdata_assert_lock(sdata); 543 544 /* update cfg80211 bss information with the new channel */ 545 if (!is_zero_ether_addr(ifibss->bssid)) { 546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 547 ifibss->chandef.chan, 548 ifibss->bssid, ifibss->ssid, 549 ifibss->ssid_len, 550 IEEE80211_BSS_TYPE_IBSS, 551 IEEE80211_PRIVACY(ifibss->privacy)); 552 /* XXX: should not really modify cfg80211 data */ 553 if (cbss) { 554 cbss->channel = sdata->csa_chandef.chan; 555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 556 } 557 } 558 559 ifibss->chandef = sdata->csa_chandef; 560 561 /* generate the beacon */ 562 return ieee80211_ibss_csa_beacon(sdata, NULL); 563 } 564 565 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 566 { 567 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 568 569 cancel_work_sync(&ifibss->csa_connection_drop_work); 570 } 571 572 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 573 __acquires(RCU) 574 { 575 struct ieee80211_sub_if_data *sdata = sta->sdata; 576 u8 addr[ETH_ALEN]; 577 578 memcpy(addr, sta->sta.addr, ETH_ALEN); 579 580 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 581 582 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 583 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 584 /* authorize the station only if the network is not RSN protected. If 585 * not wait for the userspace to authorize it */ 586 if (!sta->sdata->u.ibss.control_port) 587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 588 589 rate_control_rate_init(sta); 590 591 /* If it fails, maybe we raced another insertion? */ 592 if (sta_info_insert_rcu(sta)) 593 return sta_info_get(sdata, addr); 594 return sta; 595 } 596 597 static struct sta_info * 598 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 599 const u8 *addr, u32 supp_rates) 600 __acquires(RCU) 601 { 602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 603 struct ieee80211_local *local = sdata->local; 604 struct sta_info *sta; 605 struct ieee80211_chanctx_conf *chanctx_conf; 606 struct ieee80211_supported_band *sband; 607 enum nl80211_bss_scan_width scan_width; 608 int band; 609 610 /* 611 * XXX: Consider removing the least recently used entry and 612 * allow new one to be added. 613 */ 614 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 615 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 616 sdata->name, addr); 617 rcu_read_lock(); 618 return NULL; 619 } 620 621 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 622 rcu_read_lock(); 623 return NULL; 624 } 625 626 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 627 rcu_read_lock(); 628 return NULL; 629 } 630 631 rcu_read_lock(); 632 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 633 if (WARN_ON_ONCE(!chanctx_conf)) 634 return NULL; 635 band = chanctx_conf->def.chan->band; 636 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 637 rcu_read_unlock(); 638 639 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 640 if (!sta) { 641 rcu_read_lock(); 642 return NULL; 643 } 644 645 /* make sure mandatory rates are always added */ 646 sband = local->hw.wiphy->bands[band]; 647 sta->sta.supp_rates[band] = supp_rates | 648 ieee80211_mandatory_rates(sband, scan_width); 649 650 return ieee80211_ibss_finish_sta(sta); 651 } 652 653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 654 { 655 struct ieee80211_local *local = sdata->local; 656 int active = 0; 657 struct sta_info *sta; 658 659 sdata_assert_lock(sdata); 660 661 rcu_read_lock(); 662 663 list_for_each_entry_rcu(sta, &local->sta_list, list) { 664 unsigned long last_active = ieee80211_sta_last_active(sta); 665 666 if (sta->sdata == sdata && 667 time_is_after_jiffies(last_active + 668 IEEE80211_IBSS_MERGE_INTERVAL)) { 669 active++; 670 break; 671 } 672 } 673 674 rcu_read_unlock(); 675 676 return active; 677 } 678 679 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 680 { 681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 682 struct ieee80211_local *local = sdata->local; 683 struct cfg80211_bss *cbss; 684 struct beacon_data *presp; 685 struct sta_info *sta; 686 687 if (!is_zero_ether_addr(ifibss->bssid)) { 688 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 689 ifibss->bssid, ifibss->ssid, 690 ifibss->ssid_len, 691 IEEE80211_BSS_TYPE_IBSS, 692 IEEE80211_PRIVACY(ifibss->privacy)); 693 694 if (cbss) { 695 cfg80211_unlink_bss(local->hw.wiphy, cbss); 696 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 697 } 698 } 699 700 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 701 702 sta_info_flush(sdata); 703 704 spin_lock_bh(&ifibss->incomplete_lock); 705 while (!list_empty(&ifibss->incomplete_stations)) { 706 sta = list_first_entry(&ifibss->incomplete_stations, 707 struct sta_info, list); 708 list_del(&sta->list); 709 spin_unlock_bh(&ifibss->incomplete_lock); 710 711 sta_info_free(local, sta); 712 spin_lock_bh(&ifibss->incomplete_lock); 713 } 714 spin_unlock_bh(&ifibss->incomplete_lock); 715 716 netif_carrier_off(sdata->dev); 717 718 sdata->vif.bss_conf.ibss_joined = false; 719 sdata->vif.bss_conf.ibss_creator = false; 720 sdata->vif.bss_conf.enable_beacon = false; 721 sdata->vif.bss_conf.ssid_len = 0; 722 723 /* remove beacon */ 724 presp = rcu_dereference_protected(ifibss->presp, 725 lockdep_is_held(&sdata->wdev.mtx)); 726 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 727 if (presp) 728 kfree_rcu(presp, rcu_head); 729 730 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 731 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 732 BSS_CHANGED_IBSS); 733 drv_leave_ibss(local, sdata); 734 mutex_lock(&local->mtx); 735 ieee80211_vif_release_channel(sdata); 736 mutex_unlock(&local->mtx); 737 } 738 739 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 740 { 741 struct ieee80211_sub_if_data *sdata = 742 container_of(work, struct ieee80211_sub_if_data, 743 u.ibss.csa_connection_drop_work); 744 745 sdata_lock(sdata); 746 747 ieee80211_ibss_disconnect(sdata); 748 synchronize_rcu(); 749 skb_queue_purge(&sdata->skb_queue); 750 751 /* trigger a scan to find another IBSS network to join */ 752 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 753 754 sdata_unlock(sdata); 755 } 756 757 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 758 { 759 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 760 int err; 761 762 /* if the current channel is a DFS channel, mark the channel as 763 * unavailable. 764 */ 765 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 766 &ifibss->chandef, 767 NL80211_IFTYPE_ADHOC); 768 if (err > 0) 769 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 770 GFP_ATOMIC); 771 } 772 773 static bool 774 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 775 struct ieee802_11_elems *elems, 776 bool beacon) 777 { 778 struct cfg80211_csa_settings params; 779 struct ieee80211_csa_ie csa_ie; 780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 781 enum nl80211_channel_type ch_type; 782 int err; 783 u32 sta_flags; 784 u32 vht_cap_info = 0; 785 786 sdata_assert_lock(sdata); 787 788 sta_flags = IEEE80211_STA_DISABLE_VHT; 789 switch (ifibss->chandef.width) { 790 case NL80211_CHAN_WIDTH_5: 791 case NL80211_CHAN_WIDTH_10: 792 case NL80211_CHAN_WIDTH_20_NOHT: 793 sta_flags |= IEEE80211_STA_DISABLE_HT; 794 fallthrough; 795 case NL80211_CHAN_WIDTH_20: 796 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 797 break; 798 default: 799 break; 800 } 801 802 if (elems->vht_cap_elem) 803 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 804 805 memset(¶ms, 0, sizeof(params)); 806 err = ieee80211_parse_ch_switch_ie(sdata, elems, 807 ifibss->chandef.chan->band, 808 vht_cap_info, 809 sta_flags, ifibss->bssid, &csa_ie); 810 /* can't switch to destination channel, fail */ 811 if (err < 0) 812 goto disconnect; 813 814 /* did not contain a CSA */ 815 if (err) 816 return false; 817 818 /* channel switch is not supported, disconnect */ 819 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 820 goto disconnect; 821 822 params.count = csa_ie.count; 823 params.chandef = csa_ie.chandef; 824 825 switch (ifibss->chandef.width) { 826 case NL80211_CHAN_WIDTH_20_NOHT: 827 case NL80211_CHAN_WIDTH_20: 828 case NL80211_CHAN_WIDTH_40: 829 /* keep our current HT mode (HT20/HT40+/HT40-), even if 830 * another mode has been announced. The mode is not adopted 831 * within the beacon while doing CSA and we should therefore 832 * keep the mode which we announce. 833 */ 834 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 835 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 836 ch_type); 837 break; 838 case NL80211_CHAN_WIDTH_5: 839 case NL80211_CHAN_WIDTH_10: 840 if (params.chandef.width != ifibss->chandef.width) { 841 sdata_info(sdata, 842 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 843 ifibss->bssid, 844 params.chandef.chan->center_freq, 845 params.chandef.width, 846 params.chandef.center_freq1, 847 params.chandef.center_freq2); 848 goto disconnect; 849 } 850 break; 851 default: 852 /* should not happen, sta_flags should prevent VHT modes. */ 853 WARN_ON(1); 854 goto disconnect; 855 } 856 857 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 858 NL80211_IFTYPE_ADHOC)) { 859 sdata_info(sdata, 860 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 861 ifibss->bssid, 862 params.chandef.chan->center_freq, 863 params.chandef.width, 864 params.chandef.center_freq1, 865 params.chandef.center_freq2); 866 goto disconnect; 867 } 868 869 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 870 ¶ms.chandef, 871 NL80211_IFTYPE_ADHOC); 872 if (err < 0) 873 goto disconnect; 874 if (err > 0 && !ifibss->userspace_handles_dfs) { 875 /* IBSS-DFS only allowed with a control program */ 876 goto disconnect; 877 } 878 879 params.radar_required = err; 880 881 if (cfg80211_chandef_identical(¶ms.chandef, 882 &sdata->vif.bss_conf.chandef)) { 883 ibss_dbg(sdata, 884 "received csa with an identical chandef, ignoring\n"); 885 return true; 886 } 887 888 /* all checks done, now perform the channel switch. */ 889 ibss_dbg(sdata, 890 "received channel switch announcement to go to channel %d MHz\n", 891 params.chandef.chan->center_freq); 892 893 params.block_tx = !!csa_ie.mode; 894 895 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 896 ¶ms)) 897 goto disconnect; 898 899 ieee80211_ibss_csa_mark_radar(sdata); 900 901 return true; 902 disconnect: 903 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 904 ieee80211_queue_work(&sdata->local->hw, 905 &ifibss->csa_connection_drop_work); 906 907 ieee80211_ibss_csa_mark_radar(sdata); 908 909 return true; 910 } 911 912 static void 913 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 914 struct ieee80211_mgmt *mgmt, size_t len, 915 struct ieee80211_rx_status *rx_status, 916 struct ieee802_11_elems *elems) 917 { 918 int required_len; 919 920 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 921 return; 922 923 /* CSA is the only action we handle for now */ 924 if (mgmt->u.action.u.measurement.action_code != 925 WLAN_ACTION_SPCT_CHL_SWITCH) 926 return; 927 928 required_len = IEEE80211_MIN_ACTION_SIZE + 929 sizeof(mgmt->u.action.u.chan_switch); 930 if (len < required_len) 931 return; 932 933 if (!sdata->vif.csa_active) 934 ieee80211_ibss_process_chanswitch(sdata, elems, false); 935 } 936 937 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 938 struct ieee80211_mgmt *mgmt, 939 size_t len) 940 { 941 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 942 943 if (len < IEEE80211_DEAUTH_FRAME_LEN) 944 return; 945 946 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 947 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 948 sta_info_destroy_addr(sdata, mgmt->sa); 949 } 950 951 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 952 struct ieee80211_mgmt *mgmt, 953 size_t len) 954 { 955 u16 auth_alg, auth_transaction; 956 957 sdata_assert_lock(sdata); 958 959 if (len < 24 + 6) 960 return; 961 962 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 963 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 964 965 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 966 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 967 mgmt->bssid, auth_transaction); 968 969 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 970 return; 971 972 /* 973 * IEEE 802.11 standard does not require authentication in IBSS 974 * networks and most implementations do not seem to use it. 975 * However, try to reply to authentication attempts if someone 976 * has actually implemented this. 977 */ 978 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 979 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 980 } 981 982 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 983 struct ieee80211_mgmt *mgmt, size_t len, 984 struct ieee80211_rx_status *rx_status, 985 struct ieee802_11_elems *elems, 986 struct ieee80211_channel *channel) 987 { 988 struct sta_info *sta; 989 enum nl80211_band band = rx_status->band; 990 enum nl80211_bss_scan_width scan_width; 991 struct ieee80211_local *local = sdata->local; 992 struct ieee80211_supported_band *sband; 993 bool rates_updated = false; 994 u32 supp_rates = 0; 995 996 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 997 return; 998 999 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 1000 return; 1001 1002 sband = local->hw.wiphy->bands[band]; 1003 if (WARN_ON(!sband)) 1004 return; 1005 1006 rcu_read_lock(); 1007 sta = sta_info_get(sdata, mgmt->sa); 1008 1009 if (elems->supp_rates) { 1010 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1011 band, NULL); 1012 if (sta) { 1013 u32 prev_rates; 1014 1015 prev_rates = sta->sta.supp_rates[band]; 1016 /* make sure mandatory rates are always added */ 1017 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1018 if (rx_status->bw == RATE_INFO_BW_5) 1019 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1020 else if (rx_status->bw == RATE_INFO_BW_10) 1021 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1022 1023 sta->sta.supp_rates[band] = supp_rates | 1024 ieee80211_mandatory_rates(sband, scan_width); 1025 if (sta->sta.supp_rates[band] != prev_rates) { 1026 ibss_dbg(sdata, 1027 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1028 sta->sta.addr, prev_rates, 1029 sta->sta.supp_rates[band]); 1030 rates_updated = true; 1031 } 1032 } else { 1033 rcu_read_unlock(); 1034 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1035 mgmt->sa, supp_rates); 1036 } 1037 } 1038 1039 if (sta && !sta->sta.wme && 1040 (elems->wmm_info || elems->s1g_capab) && 1041 local->hw.queues >= IEEE80211_NUM_ACS) { 1042 sta->sta.wme = true; 1043 ieee80211_check_fast_xmit(sta); 1044 } 1045 1046 if (sta && elems->ht_operation && elems->ht_cap_elem && 1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1049 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1050 /* we both use HT */ 1051 struct ieee80211_ht_cap htcap_ie; 1052 struct cfg80211_chan_def chandef; 1053 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1054 1055 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1056 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1057 1058 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1059 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1060 &htcap_ie, 1061 sta); 1062 1063 if (elems->vht_operation && elems->vht_cap_elem && 1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1065 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1066 /* we both use VHT */ 1067 struct ieee80211_vht_cap cap_ie; 1068 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1069 u32 vht_cap_info = 1070 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1071 1072 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1073 elems->vht_operation, 1074 elems->ht_operation, 1075 &chandef); 1076 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1077 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1078 &cap_ie, sta); 1079 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1080 rates_updated |= true; 1081 } 1082 1083 if (bw != sta->sta.bandwidth) 1084 rates_updated |= true; 1085 1086 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1087 &chandef)) 1088 WARN_ON_ONCE(1); 1089 } 1090 1091 if (sta && rates_updated) { 1092 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1093 u8 rx_nss = sta->sta.rx_nss; 1094 1095 /* Force rx_nss recalculation */ 1096 sta->sta.rx_nss = 0; 1097 rate_control_rate_init(sta); 1098 if (sta->sta.rx_nss != rx_nss) 1099 changed |= IEEE80211_RC_NSS_CHANGED; 1100 1101 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1102 } 1103 1104 rcu_read_unlock(); 1105 } 1106 1107 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1108 struct ieee80211_mgmt *mgmt, size_t len, 1109 struct ieee80211_rx_status *rx_status, 1110 struct ieee802_11_elems *elems) 1111 { 1112 struct ieee80211_local *local = sdata->local; 1113 struct cfg80211_bss *cbss; 1114 struct ieee80211_bss *bss; 1115 struct ieee80211_channel *channel; 1116 u64 beacon_timestamp, rx_timestamp; 1117 u32 supp_rates = 0; 1118 enum nl80211_band band = rx_status->band; 1119 1120 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1121 if (!channel) 1122 return; 1123 1124 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1125 1126 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1127 if (!bss) 1128 return; 1129 1130 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1131 1132 /* same for beacon and probe response */ 1133 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1134 1135 /* check if we need to merge IBSS */ 1136 1137 /* not an IBSS */ 1138 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1139 goto put_bss; 1140 1141 /* different channel */ 1142 if (sdata->u.ibss.fixed_channel && 1143 sdata->u.ibss.chandef.chan != cbss->channel) 1144 goto put_bss; 1145 1146 /* different SSID */ 1147 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1148 memcmp(elems->ssid, sdata->u.ibss.ssid, 1149 sdata->u.ibss.ssid_len)) 1150 goto put_bss; 1151 1152 /* process channel switch */ 1153 if (sdata->vif.csa_active || 1154 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1155 goto put_bss; 1156 1157 /* same BSSID */ 1158 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1159 goto put_bss; 1160 1161 /* we use a fixed BSSID */ 1162 if (sdata->u.ibss.fixed_bssid) 1163 goto put_bss; 1164 1165 if (ieee80211_have_rx_timestamp(rx_status)) { 1166 /* time when timestamp field was received */ 1167 rx_timestamp = 1168 ieee80211_calculate_rx_timestamp(local, rx_status, 1169 len + FCS_LEN, 24); 1170 } else { 1171 /* 1172 * second best option: get current TSF 1173 * (will return -1 if not supported) 1174 */ 1175 rx_timestamp = drv_get_tsf(local, sdata); 1176 } 1177 1178 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1179 mgmt->sa, mgmt->bssid, 1180 (unsigned long long)rx_timestamp); 1181 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1182 (unsigned long long)beacon_timestamp, 1183 (unsigned long long)(rx_timestamp - beacon_timestamp), 1184 jiffies); 1185 1186 if (beacon_timestamp > rx_timestamp) { 1187 ibss_dbg(sdata, 1188 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1189 mgmt->bssid); 1190 ieee80211_sta_join_ibss(sdata, bss); 1191 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1192 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1193 supp_rates); 1194 rcu_read_unlock(); 1195 } 1196 1197 put_bss: 1198 ieee80211_rx_bss_put(local, bss); 1199 } 1200 1201 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1202 const u8 *bssid, const u8 *addr, 1203 u32 supp_rates) 1204 { 1205 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1206 struct ieee80211_local *local = sdata->local; 1207 struct sta_info *sta; 1208 struct ieee80211_chanctx_conf *chanctx_conf; 1209 struct ieee80211_supported_band *sband; 1210 enum nl80211_bss_scan_width scan_width; 1211 int band; 1212 1213 /* 1214 * XXX: Consider removing the least recently used entry and 1215 * allow new one to be added. 1216 */ 1217 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1218 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1219 sdata->name, addr); 1220 return; 1221 } 1222 1223 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1224 return; 1225 1226 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1227 return; 1228 1229 rcu_read_lock(); 1230 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1231 if (WARN_ON_ONCE(!chanctx_conf)) { 1232 rcu_read_unlock(); 1233 return; 1234 } 1235 band = chanctx_conf->def.chan->band; 1236 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1237 rcu_read_unlock(); 1238 1239 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1240 if (!sta) 1241 return; 1242 1243 /* make sure mandatory rates are always added */ 1244 sband = local->hw.wiphy->bands[band]; 1245 sta->sta.supp_rates[band] = supp_rates | 1246 ieee80211_mandatory_rates(sband, scan_width); 1247 1248 spin_lock(&ifibss->incomplete_lock); 1249 list_add(&sta->list, &ifibss->incomplete_stations); 1250 spin_unlock(&ifibss->incomplete_lock); 1251 ieee80211_queue_work(&local->hw, &sdata->work); 1252 } 1253 1254 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1255 { 1256 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1257 struct ieee80211_local *local = sdata->local; 1258 struct sta_info *sta, *tmp; 1259 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1260 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1261 1262 mutex_lock(&local->sta_mtx); 1263 1264 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1265 unsigned long last_active = ieee80211_sta_last_active(sta); 1266 1267 if (sdata != sta->sdata) 1268 continue; 1269 1270 if (time_is_before_jiffies(last_active + exp_time) || 1271 (time_is_before_jiffies(last_active + exp_rsn) && 1272 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1273 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1274 1275 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1276 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1277 "not authorized " : "", sta->sta.addr); 1278 1279 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1280 ifibss->bssid, 1281 IEEE80211_STYPE_DEAUTH, 1282 WLAN_REASON_DEAUTH_LEAVING, 1283 true, frame_buf); 1284 WARN_ON(__sta_info_destroy(sta)); 1285 } 1286 } 1287 1288 mutex_unlock(&local->sta_mtx); 1289 } 1290 1291 /* 1292 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1293 */ 1294 1295 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1296 { 1297 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1298 enum nl80211_bss_scan_width scan_width; 1299 1300 sdata_assert_lock(sdata); 1301 1302 mod_timer(&ifibss->timer, 1303 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1304 1305 ieee80211_ibss_sta_expire(sdata); 1306 1307 if (time_before(jiffies, ifibss->last_scan_completed + 1308 IEEE80211_IBSS_MERGE_INTERVAL)) 1309 return; 1310 1311 if (ieee80211_sta_active_ibss(sdata)) 1312 return; 1313 1314 if (ifibss->fixed_channel) 1315 return; 1316 1317 sdata_info(sdata, 1318 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1319 1320 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1321 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1322 NULL, 0, scan_width); 1323 } 1324 1325 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1326 { 1327 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1328 u8 bssid[ETH_ALEN]; 1329 u16 capability; 1330 int i; 1331 1332 sdata_assert_lock(sdata); 1333 1334 if (ifibss->fixed_bssid) { 1335 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1336 } else { 1337 /* Generate random, not broadcast, locally administered BSSID. Mix in 1338 * own MAC address to make sure that devices that do not have proper 1339 * random number generator get different BSSID. */ 1340 get_random_bytes(bssid, ETH_ALEN); 1341 for (i = 0; i < ETH_ALEN; i++) 1342 bssid[i] ^= sdata->vif.addr[i]; 1343 bssid[0] &= ~0x01; 1344 bssid[0] |= 0x02; 1345 } 1346 1347 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1348 1349 capability = WLAN_CAPABILITY_IBSS; 1350 1351 if (ifibss->privacy) 1352 capability |= WLAN_CAPABILITY_PRIVACY; 1353 1354 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1355 &ifibss->chandef, ifibss->basic_rates, 1356 capability, 0, true); 1357 } 1358 1359 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1360 struct ieee80211_channel **channels, 1361 unsigned int channels_max, 1362 u32 center_freq, u32 width) 1363 { 1364 struct ieee80211_channel *chan = NULL; 1365 unsigned int n_chan = 0; 1366 u32 start_freq, end_freq, freq; 1367 1368 if (width <= 20) { 1369 start_freq = center_freq; 1370 end_freq = center_freq; 1371 } else { 1372 start_freq = center_freq - width / 2 + 10; 1373 end_freq = center_freq + width / 2 - 10; 1374 } 1375 1376 for (freq = start_freq; freq <= end_freq; freq += 20) { 1377 chan = ieee80211_get_channel(wiphy, freq); 1378 if (!chan) 1379 continue; 1380 if (n_chan >= channels_max) 1381 return n_chan; 1382 1383 channels[n_chan] = chan; 1384 n_chan++; 1385 } 1386 1387 return n_chan; 1388 } 1389 1390 static unsigned int 1391 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1392 const struct cfg80211_chan_def *chandef, 1393 struct ieee80211_channel **channels, 1394 unsigned int channels_max) 1395 { 1396 unsigned int n_chan = 0; 1397 u32 width, cf1, cf2 = 0; 1398 1399 switch (chandef->width) { 1400 case NL80211_CHAN_WIDTH_40: 1401 width = 40; 1402 break; 1403 case NL80211_CHAN_WIDTH_80P80: 1404 cf2 = chandef->center_freq2; 1405 fallthrough; 1406 case NL80211_CHAN_WIDTH_80: 1407 width = 80; 1408 break; 1409 case NL80211_CHAN_WIDTH_160: 1410 width = 160; 1411 break; 1412 default: 1413 width = 20; 1414 break; 1415 } 1416 1417 cf1 = chandef->center_freq1; 1418 1419 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1420 1421 if (cf2) 1422 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1423 channels_max - n_chan, cf2, 1424 width); 1425 1426 return n_chan; 1427 } 1428 1429 /* 1430 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1431 */ 1432 1433 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1434 { 1435 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1436 struct ieee80211_local *local = sdata->local; 1437 struct cfg80211_bss *cbss; 1438 struct ieee80211_channel *chan = NULL; 1439 const u8 *bssid = NULL; 1440 enum nl80211_bss_scan_width scan_width; 1441 int active_ibss; 1442 1443 sdata_assert_lock(sdata); 1444 1445 active_ibss = ieee80211_sta_active_ibss(sdata); 1446 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1447 1448 if (active_ibss) 1449 return; 1450 1451 if (ifibss->fixed_bssid) 1452 bssid = ifibss->bssid; 1453 if (ifibss->fixed_channel) 1454 chan = ifibss->chandef.chan; 1455 if (!is_zero_ether_addr(ifibss->bssid)) 1456 bssid = ifibss->bssid; 1457 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1458 ifibss->ssid, ifibss->ssid_len, 1459 IEEE80211_BSS_TYPE_IBSS, 1460 IEEE80211_PRIVACY(ifibss->privacy)); 1461 1462 if (cbss) { 1463 struct ieee80211_bss *bss; 1464 1465 bss = (void *)cbss->priv; 1466 ibss_dbg(sdata, 1467 "sta_find_ibss: selected %pM current %pM\n", 1468 cbss->bssid, ifibss->bssid); 1469 sdata_info(sdata, 1470 "Selected IBSS BSSID %pM based on configured SSID\n", 1471 cbss->bssid); 1472 1473 ieee80211_sta_join_ibss(sdata, bss); 1474 ieee80211_rx_bss_put(local, bss); 1475 return; 1476 } 1477 1478 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1479 * directly and do not waste time scanning 1480 */ 1481 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1482 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1483 bssid); 1484 ieee80211_sta_create_ibss(sdata); 1485 return; 1486 } 1487 1488 1489 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1490 1491 /* Selected IBSS not found in current scan results - try to scan */ 1492 if (time_after(jiffies, ifibss->last_scan_completed + 1493 IEEE80211_SCAN_INTERVAL)) { 1494 struct ieee80211_channel *channels[8]; 1495 unsigned int num; 1496 1497 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1498 1499 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1500 1501 if (ifibss->fixed_channel) { 1502 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1503 &ifibss->chandef, 1504 channels, 1505 ARRAY_SIZE(channels)); 1506 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1507 ifibss->ssid_len, channels, 1508 num, scan_width); 1509 } else { 1510 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1511 ifibss->ssid_len, NULL, 1512 0, scan_width); 1513 } 1514 } else { 1515 int interval = IEEE80211_SCAN_INTERVAL; 1516 1517 if (time_after(jiffies, ifibss->ibss_join_req + 1518 IEEE80211_IBSS_JOIN_TIMEOUT)) 1519 ieee80211_sta_create_ibss(sdata); 1520 1521 mod_timer(&ifibss->timer, 1522 round_jiffies(jiffies + interval)); 1523 } 1524 } 1525 1526 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1527 struct sk_buff *req) 1528 { 1529 struct ieee80211_mgmt *mgmt = (void *)req->data; 1530 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1531 struct ieee80211_local *local = sdata->local; 1532 int tx_last_beacon, len = req->len; 1533 struct sk_buff *skb; 1534 struct beacon_data *presp; 1535 u8 *pos, *end; 1536 1537 sdata_assert_lock(sdata); 1538 1539 presp = rcu_dereference_protected(ifibss->presp, 1540 lockdep_is_held(&sdata->wdev.mtx)); 1541 1542 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1543 len < 24 + 2 || !presp) 1544 return; 1545 1546 tx_last_beacon = drv_tx_last_beacon(local); 1547 1548 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1549 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1550 mgmt->bssid, tx_last_beacon); 1551 1552 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1553 return; 1554 1555 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1556 !is_broadcast_ether_addr(mgmt->bssid)) 1557 return; 1558 1559 end = ((u8 *) mgmt) + len; 1560 pos = mgmt->u.probe_req.variable; 1561 if (pos[0] != WLAN_EID_SSID || 1562 pos + 2 + pos[1] > end) { 1563 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1564 mgmt->sa); 1565 return; 1566 } 1567 if (pos[1] != 0 && 1568 (pos[1] != ifibss->ssid_len || 1569 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1570 /* Ignore ProbeReq for foreign SSID */ 1571 return; 1572 } 1573 1574 /* Reply with ProbeResp */ 1575 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1576 if (!skb) 1577 return; 1578 1579 skb_reserve(skb, local->tx_headroom); 1580 skb_put_data(skb, presp->head, presp->head_len); 1581 1582 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1583 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1584 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1585 1586 /* avoid excessive retries for probe request to wildcard SSIDs */ 1587 if (pos[1] == 0) 1588 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1589 1590 ieee80211_tx_skb(sdata, skb); 1591 } 1592 1593 static 1594 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1595 struct ieee80211_mgmt *mgmt, size_t len, 1596 struct ieee80211_rx_status *rx_status) 1597 { 1598 size_t baselen; 1599 struct ieee802_11_elems elems; 1600 1601 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1602 offsetof(typeof(mgmt->u.beacon), variable)); 1603 1604 /* 1605 * either beacon or probe_resp but the variable field is at the 1606 * same offset 1607 */ 1608 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1609 if (baselen > len) 1610 return; 1611 1612 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1613 false, &elems, mgmt->bssid, NULL); 1614 1615 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1616 } 1617 1618 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1619 struct sk_buff *skb) 1620 { 1621 struct ieee80211_rx_status *rx_status; 1622 struct ieee80211_mgmt *mgmt; 1623 u16 fc; 1624 struct ieee802_11_elems elems; 1625 int ies_len; 1626 1627 rx_status = IEEE80211_SKB_RXCB(skb); 1628 mgmt = (struct ieee80211_mgmt *) skb->data; 1629 fc = le16_to_cpu(mgmt->frame_control); 1630 1631 sdata_lock(sdata); 1632 1633 if (!sdata->u.ibss.ssid_len) 1634 goto mgmt_out; /* not ready to merge yet */ 1635 1636 switch (fc & IEEE80211_FCTL_STYPE) { 1637 case IEEE80211_STYPE_PROBE_REQ: 1638 ieee80211_rx_mgmt_probe_req(sdata, skb); 1639 break; 1640 case IEEE80211_STYPE_PROBE_RESP: 1641 case IEEE80211_STYPE_BEACON: 1642 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1643 rx_status); 1644 break; 1645 case IEEE80211_STYPE_AUTH: 1646 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1647 break; 1648 case IEEE80211_STYPE_DEAUTH: 1649 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1650 break; 1651 case IEEE80211_STYPE_ACTION: 1652 switch (mgmt->u.action.category) { 1653 case WLAN_CATEGORY_SPECTRUM_MGMT: 1654 ies_len = skb->len - 1655 offsetof(struct ieee80211_mgmt, 1656 u.action.u.chan_switch.variable); 1657 1658 if (ies_len < 0) 1659 break; 1660 1661 ieee802_11_parse_elems( 1662 mgmt->u.action.u.chan_switch.variable, 1663 ies_len, true, &elems, mgmt->bssid, NULL); 1664 1665 if (elems.parse_error) 1666 break; 1667 1668 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1669 rx_status, &elems); 1670 break; 1671 } 1672 } 1673 1674 mgmt_out: 1675 sdata_unlock(sdata); 1676 } 1677 1678 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1679 { 1680 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1681 struct sta_info *sta; 1682 1683 sdata_lock(sdata); 1684 1685 /* 1686 * Work could be scheduled after scan or similar 1687 * when we aren't even joined (or trying) with a 1688 * network. 1689 */ 1690 if (!ifibss->ssid_len) 1691 goto out; 1692 1693 spin_lock_bh(&ifibss->incomplete_lock); 1694 while (!list_empty(&ifibss->incomplete_stations)) { 1695 sta = list_first_entry(&ifibss->incomplete_stations, 1696 struct sta_info, list); 1697 list_del(&sta->list); 1698 spin_unlock_bh(&ifibss->incomplete_lock); 1699 1700 ieee80211_ibss_finish_sta(sta); 1701 rcu_read_unlock(); 1702 spin_lock_bh(&ifibss->incomplete_lock); 1703 } 1704 spin_unlock_bh(&ifibss->incomplete_lock); 1705 1706 switch (ifibss->state) { 1707 case IEEE80211_IBSS_MLME_SEARCH: 1708 ieee80211_sta_find_ibss(sdata); 1709 break; 1710 case IEEE80211_IBSS_MLME_JOINED: 1711 ieee80211_sta_merge_ibss(sdata); 1712 break; 1713 default: 1714 WARN_ON(1); 1715 break; 1716 } 1717 1718 out: 1719 sdata_unlock(sdata); 1720 } 1721 1722 static void ieee80211_ibss_timer(struct timer_list *t) 1723 { 1724 struct ieee80211_sub_if_data *sdata = 1725 from_timer(sdata, t, u.ibss.timer); 1726 1727 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1728 } 1729 1730 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1731 { 1732 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1733 1734 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1735 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1736 spin_lock_init(&ifibss->incomplete_lock); 1737 INIT_WORK(&ifibss->csa_connection_drop_work, 1738 ieee80211_csa_connection_drop_work); 1739 } 1740 1741 /* scan finished notification */ 1742 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1743 { 1744 struct ieee80211_sub_if_data *sdata; 1745 1746 mutex_lock(&local->iflist_mtx); 1747 list_for_each_entry(sdata, &local->interfaces, list) { 1748 if (!ieee80211_sdata_running(sdata)) 1749 continue; 1750 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1751 continue; 1752 sdata->u.ibss.last_scan_completed = jiffies; 1753 } 1754 mutex_unlock(&local->iflist_mtx); 1755 } 1756 1757 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1758 struct cfg80211_ibss_params *params) 1759 { 1760 u32 changed = 0; 1761 u32 rate_flags; 1762 struct ieee80211_supported_band *sband; 1763 enum ieee80211_chanctx_mode chanmode; 1764 struct ieee80211_local *local = sdata->local; 1765 int radar_detect_width = 0; 1766 int i; 1767 int ret; 1768 1769 if (params->chandef.chan->freq_offset) { 1770 /* this may work, but is untested */ 1771 return -EOPNOTSUPP; 1772 } 1773 1774 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1775 ¶ms->chandef, 1776 sdata->wdev.iftype); 1777 if (ret < 0) 1778 return ret; 1779 1780 if (ret > 0) { 1781 if (!params->userspace_handles_dfs) 1782 return -EINVAL; 1783 radar_detect_width = BIT(params->chandef.width); 1784 } 1785 1786 chanmode = (params->channel_fixed && !ret) ? 1787 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1788 1789 mutex_lock(&local->chanctx_mtx); 1790 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1791 radar_detect_width); 1792 mutex_unlock(&local->chanctx_mtx); 1793 if (ret < 0) 1794 return ret; 1795 1796 if (params->bssid) { 1797 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1798 sdata->u.ibss.fixed_bssid = true; 1799 } else 1800 sdata->u.ibss.fixed_bssid = false; 1801 1802 sdata->u.ibss.privacy = params->privacy; 1803 sdata->u.ibss.control_port = params->control_port; 1804 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1805 sdata->u.ibss.basic_rates = params->basic_rates; 1806 sdata->u.ibss.last_scan_completed = jiffies; 1807 1808 /* fix basic_rates if channel does not support these rates */ 1809 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1810 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1811 for (i = 0; i < sband->n_bitrates; i++) { 1812 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1813 sdata->u.ibss.basic_rates &= ~BIT(i); 1814 } 1815 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1816 sizeof(params->mcast_rate)); 1817 1818 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1819 1820 sdata->u.ibss.chandef = params->chandef; 1821 sdata->u.ibss.fixed_channel = params->channel_fixed; 1822 1823 if (params->ie) { 1824 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1825 GFP_KERNEL); 1826 if (sdata->u.ibss.ie) 1827 sdata->u.ibss.ie_len = params->ie_len; 1828 } 1829 1830 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1831 sdata->u.ibss.ibss_join_req = jiffies; 1832 1833 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1834 sdata->u.ibss.ssid_len = params->ssid_len; 1835 1836 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1837 sizeof(sdata->u.ibss.ht_capa)); 1838 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1839 sizeof(sdata->u.ibss.ht_capa_mask)); 1840 1841 /* 1842 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1843 * reserved, but an HT STA shall protect HT transmissions as though 1844 * the HT Protection field were set to non-HT mixed mode. 1845 * 1846 * In an IBSS, the RIFS Mode field of the HT Operation element is 1847 * also reserved, but an HT STA shall operate as though this field 1848 * were set to 1. 1849 */ 1850 1851 sdata->vif.bss_conf.ht_operation_mode |= 1852 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1853 | IEEE80211_HT_PARAM_RIFS_MODE; 1854 1855 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1856 ieee80211_bss_info_change_notify(sdata, changed); 1857 1858 sdata->smps_mode = IEEE80211_SMPS_OFF; 1859 sdata->needed_rx_chains = local->rx_chains; 1860 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1861 1862 ieee80211_queue_work(&local->hw, &sdata->work); 1863 1864 return 0; 1865 } 1866 1867 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1868 { 1869 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1870 1871 ieee80211_ibss_disconnect(sdata); 1872 ifibss->ssid_len = 0; 1873 eth_zero_addr(ifibss->bssid); 1874 1875 /* remove beacon */ 1876 kfree(sdata->u.ibss.ie); 1877 sdata->u.ibss.ie = NULL; 1878 sdata->u.ibss.ie_len = 0; 1879 1880 /* on the next join, re-program HT parameters */ 1881 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1882 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1883 1884 synchronize_rcu(); 1885 1886 skb_queue_purge(&sdata->skb_queue); 1887 1888 del_timer_sync(&sdata->u.ibss.timer); 1889 1890 return 0; 1891 } 1892