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->csa_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->csa_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 && local->hw.queues >= IEEE80211_NUM_ACS) { 1041 sta->sta.wme = true; 1042 ieee80211_check_fast_xmit(sta); 1043 } 1044 1045 if (sta && elems->ht_operation && elems->ht_cap_elem && 1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1047 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1048 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1049 /* we both use HT */ 1050 struct ieee80211_ht_cap htcap_ie; 1051 struct cfg80211_chan_def chandef; 1052 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1053 1054 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1055 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1056 1057 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1058 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1059 &htcap_ie, 1060 sta); 1061 1062 if (elems->vht_operation && elems->vht_cap_elem && 1063 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1064 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1065 /* we both use VHT */ 1066 struct ieee80211_vht_cap cap_ie; 1067 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1068 u32 vht_cap_info = 1069 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1070 1071 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1072 elems->vht_operation, 1073 elems->ht_operation, 1074 &chandef); 1075 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1076 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1077 &cap_ie, sta); 1078 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1079 rates_updated |= true; 1080 } 1081 1082 if (bw != sta->sta.bandwidth) 1083 rates_updated |= true; 1084 1085 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1086 &chandef)) 1087 WARN_ON_ONCE(1); 1088 } 1089 1090 if (sta && rates_updated) { 1091 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1092 u8 rx_nss = sta->sta.rx_nss; 1093 1094 /* Force rx_nss recalculation */ 1095 sta->sta.rx_nss = 0; 1096 rate_control_rate_init(sta); 1097 if (sta->sta.rx_nss != rx_nss) 1098 changed |= IEEE80211_RC_NSS_CHANGED; 1099 1100 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1101 } 1102 1103 rcu_read_unlock(); 1104 } 1105 1106 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1107 struct ieee80211_mgmt *mgmt, size_t len, 1108 struct ieee80211_rx_status *rx_status, 1109 struct ieee802_11_elems *elems) 1110 { 1111 struct ieee80211_local *local = sdata->local; 1112 struct cfg80211_bss *cbss; 1113 struct ieee80211_bss *bss; 1114 struct ieee80211_channel *channel; 1115 u64 beacon_timestamp, rx_timestamp; 1116 u32 supp_rates = 0; 1117 enum nl80211_band band = rx_status->band; 1118 1119 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1120 if (!channel) 1121 return; 1122 1123 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1124 1125 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1126 if (!bss) 1127 return; 1128 1129 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1130 1131 /* same for beacon and probe response */ 1132 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1133 1134 /* check if we need to merge IBSS */ 1135 1136 /* not an IBSS */ 1137 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1138 goto put_bss; 1139 1140 /* different channel */ 1141 if (sdata->u.ibss.fixed_channel && 1142 sdata->u.ibss.chandef.chan != cbss->channel) 1143 goto put_bss; 1144 1145 /* different SSID */ 1146 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1147 memcmp(elems->ssid, sdata->u.ibss.ssid, 1148 sdata->u.ibss.ssid_len)) 1149 goto put_bss; 1150 1151 /* process channel switch */ 1152 if (sdata->vif.csa_active || 1153 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1154 goto put_bss; 1155 1156 /* same BSSID */ 1157 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1158 goto put_bss; 1159 1160 /* we use a fixed BSSID */ 1161 if (sdata->u.ibss.fixed_bssid) 1162 goto put_bss; 1163 1164 if (ieee80211_have_rx_timestamp(rx_status)) { 1165 /* time when timestamp field was received */ 1166 rx_timestamp = 1167 ieee80211_calculate_rx_timestamp(local, rx_status, 1168 len + FCS_LEN, 24); 1169 } else { 1170 /* 1171 * second best option: get current TSF 1172 * (will return -1 if not supported) 1173 */ 1174 rx_timestamp = drv_get_tsf(local, sdata); 1175 } 1176 1177 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1178 mgmt->sa, mgmt->bssid, 1179 (unsigned long long)rx_timestamp); 1180 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1181 (unsigned long long)beacon_timestamp, 1182 (unsigned long long)(rx_timestamp - beacon_timestamp), 1183 jiffies); 1184 1185 if (beacon_timestamp > rx_timestamp) { 1186 ibss_dbg(sdata, 1187 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1188 mgmt->bssid); 1189 ieee80211_sta_join_ibss(sdata, bss); 1190 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1191 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1192 supp_rates); 1193 rcu_read_unlock(); 1194 } 1195 1196 put_bss: 1197 ieee80211_rx_bss_put(local, bss); 1198 } 1199 1200 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1201 const u8 *bssid, const u8 *addr, 1202 u32 supp_rates) 1203 { 1204 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1205 struct ieee80211_local *local = sdata->local; 1206 struct sta_info *sta; 1207 struct ieee80211_chanctx_conf *chanctx_conf; 1208 struct ieee80211_supported_band *sband; 1209 enum nl80211_bss_scan_width scan_width; 1210 int band; 1211 1212 /* 1213 * XXX: Consider removing the least recently used entry and 1214 * allow new one to be added. 1215 */ 1216 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1217 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1218 sdata->name, addr); 1219 return; 1220 } 1221 1222 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1223 return; 1224 1225 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1226 return; 1227 1228 rcu_read_lock(); 1229 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1230 if (WARN_ON_ONCE(!chanctx_conf)) { 1231 rcu_read_unlock(); 1232 return; 1233 } 1234 band = chanctx_conf->def.chan->band; 1235 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1236 rcu_read_unlock(); 1237 1238 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1239 if (!sta) 1240 return; 1241 1242 /* make sure mandatory rates are always added */ 1243 sband = local->hw.wiphy->bands[band]; 1244 sta->sta.supp_rates[band] = supp_rates | 1245 ieee80211_mandatory_rates(sband, scan_width); 1246 1247 spin_lock(&ifibss->incomplete_lock); 1248 list_add(&sta->list, &ifibss->incomplete_stations); 1249 spin_unlock(&ifibss->incomplete_lock); 1250 ieee80211_queue_work(&local->hw, &sdata->work); 1251 } 1252 1253 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1254 { 1255 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1256 struct ieee80211_local *local = sdata->local; 1257 struct sta_info *sta, *tmp; 1258 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1259 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1260 1261 mutex_lock(&local->sta_mtx); 1262 1263 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1264 unsigned long last_active = ieee80211_sta_last_active(sta); 1265 1266 if (sdata != sta->sdata) 1267 continue; 1268 1269 if (time_is_before_jiffies(last_active + exp_time) || 1270 (time_is_before_jiffies(last_active + exp_rsn) && 1271 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1272 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1273 1274 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1275 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1276 "not authorized " : "", sta->sta.addr); 1277 1278 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1279 ifibss->bssid, 1280 IEEE80211_STYPE_DEAUTH, 1281 WLAN_REASON_DEAUTH_LEAVING, 1282 true, frame_buf); 1283 WARN_ON(__sta_info_destroy(sta)); 1284 } 1285 } 1286 1287 mutex_unlock(&local->sta_mtx); 1288 } 1289 1290 /* 1291 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1292 */ 1293 1294 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1295 { 1296 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1297 enum nl80211_bss_scan_width scan_width; 1298 1299 sdata_assert_lock(sdata); 1300 1301 mod_timer(&ifibss->timer, 1302 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1303 1304 ieee80211_ibss_sta_expire(sdata); 1305 1306 if (time_before(jiffies, ifibss->last_scan_completed + 1307 IEEE80211_IBSS_MERGE_INTERVAL)) 1308 return; 1309 1310 if (ieee80211_sta_active_ibss(sdata)) 1311 return; 1312 1313 if (ifibss->fixed_channel) 1314 return; 1315 1316 sdata_info(sdata, 1317 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1318 1319 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1320 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1321 NULL, 0, scan_width); 1322 } 1323 1324 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1325 { 1326 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1327 u8 bssid[ETH_ALEN]; 1328 u16 capability; 1329 int i; 1330 1331 sdata_assert_lock(sdata); 1332 1333 if (ifibss->fixed_bssid) { 1334 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1335 } else { 1336 /* Generate random, not broadcast, locally administered BSSID. Mix in 1337 * own MAC address to make sure that devices that do not have proper 1338 * random number generator get different BSSID. */ 1339 get_random_bytes(bssid, ETH_ALEN); 1340 for (i = 0; i < ETH_ALEN; i++) 1341 bssid[i] ^= sdata->vif.addr[i]; 1342 bssid[0] &= ~0x01; 1343 bssid[0] |= 0x02; 1344 } 1345 1346 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1347 1348 capability = WLAN_CAPABILITY_IBSS; 1349 1350 if (ifibss->privacy) 1351 capability |= WLAN_CAPABILITY_PRIVACY; 1352 1353 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1354 &ifibss->chandef, ifibss->basic_rates, 1355 capability, 0, true); 1356 } 1357 1358 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1359 struct ieee80211_channel **channels, 1360 unsigned int channels_max, 1361 u32 center_freq, u32 width) 1362 { 1363 struct ieee80211_channel *chan = NULL; 1364 unsigned int n_chan = 0; 1365 u32 start_freq, end_freq, freq; 1366 1367 if (width <= 20) { 1368 start_freq = center_freq; 1369 end_freq = center_freq; 1370 } else { 1371 start_freq = center_freq - width / 2 + 10; 1372 end_freq = center_freq + width / 2 - 10; 1373 } 1374 1375 for (freq = start_freq; freq <= end_freq; freq += 20) { 1376 chan = ieee80211_get_channel(wiphy, freq); 1377 if (!chan) 1378 continue; 1379 if (n_chan >= channels_max) 1380 return n_chan; 1381 1382 channels[n_chan] = chan; 1383 n_chan++; 1384 } 1385 1386 return n_chan; 1387 } 1388 1389 static unsigned int 1390 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1391 const struct cfg80211_chan_def *chandef, 1392 struct ieee80211_channel **channels, 1393 unsigned int channels_max) 1394 { 1395 unsigned int n_chan = 0; 1396 u32 width, cf1, cf2 = 0; 1397 1398 switch (chandef->width) { 1399 case NL80211_CHAN_WIDTH_40: 1400 width = 40; 1401 break; 1402 case NL80211_CHAN_WIDTH_80P80: 1403 cf2 = chandef->center_freq2; 1404 fallthrough; 1405 case NL80211_CHAN_WIDTH_80: 1406 width = 80; 1407 break; 1408 case NL80211_CHAN_WIDTH_160: 1409 width = 160; 1410 break; 1411 default: 1412 width = 20; 1413 break; 1414 } 1415 1416 cf1 = chandef->center_freq1; 1417 1418 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1419 1420 if (cf2) 1421 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1422 channels_max - n_chan, cf2, 1423 width); 1424 1425 return n_chan; 1426 } 1427 1428 /* 1429 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1430 */ 1431 1432 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1433 { 1434 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1435 struct ieee80211_local *local = sdata->local; 1436 struct cfg80211_bss *cbss; 1437 struct ieee80211_channel *chan = NULL; 1438 const u8 *bssid = NULL; 1439 enum nl80211_bss_scan_width scan_width; 1440 int active_ibss; 1441 1442 sdata_assert_lock(sdata); 1443 1444 active_ibss = ieee80211_sta_active_ibss(sdata); 1445 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1446 1447 if (active_ibss) 1448 return; 1449 1450 if (ifibss->fixed_bssid) 1451 bssid = ifibss->bssid; 1452 if (ifibss->fixed_channel) 1453 chan = ifibss->chandef.chan; 1454 if (!is_zero_ether_addr(ifibss->bssid)) 1455 bssid = ifibss->bssid; 1456 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1457 ifibss->ssid, ifibss->ssid_len, 1458 IEEE80211_BSS_TYPE_IBSS, 1459 IEEE80211_PRIVACY(ifibss->privacy)); 1460 1461 if (cbss) { 1462 struct ieee80211_bss *bss; 1463 1464 bss = (void *)cbss->priv; 1465 ibss_dbg(sdata, 1466 "sta_find_ibss: selected %pM current %pM\n", 1467 cbss->bssid, ifibss->bssid); 1468 sdata_info(sdata, 1469 "Selected IBSS BSSID %pM based on configured SSID\n", 1470 cbss->bssid); 1471 1472 ieee80211_sta_join_ibss(sdata, bss); 1473 ieee80211_rx_bss_put(local, bss); 1474 return; 1475 } 1476 1477 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1478 * directly and do not waste time scanning 1479 */ 1480 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1481 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1482 bssid); 1483 ieee80211_sta_create_ibss(sdata); 1484 return; 1485 } 1486 1487 1488 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1489 1490 /* Selected IBSS not found in current scan results - try to scan */ 1491 if (time_after(jiffies, ifibss->last_scan_completed + 1492 IEEE80211_SCAN_INTERVAL)) { 1493 struct ieee80211_channel *channels[8]; 1494 unsigned int num; 1495 1496 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1497 1498 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1499 1500 if (ifibss->fixed_channel) { 1501 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1502 &ifibss->chandef, 1503 channels, 1504 ARRAY_SIZE(channels)); 1505 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1506 ifibss->ssid_len, channels, 1507 num, scan_width); 1508 } else { 1509 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1510 ifibss->ssid_len, NULL, 1511 0, scan_width); 1512 } 1513 } else { 1514 int interval = IEEE80211_SCAN_INTERVAL; 1515 1516 if (time_after(jiffies, ifibss->ibss_join_req + 1517 IEEE80211_IBSS_JOIN_TIMEOUT)) 1518 ieee80211_sta_create_ibss(sdata); 1519 1520 mod_timer(&ifibss->timer, 1521 round_jiffies(jiffies + interval)); 1522 } 1523 } 1524 1525 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1526 struct sk_buff *req) 1527 { 1528 struct ieee80211_mgmt *mgmt = (void *)req->data; 1529 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1530 struct ieee80211_local *local = sdata->local; 1531 int tx_last_beacon, len = req->len; 1532 struct sk_buff *skb; 1533 struct beacon_data *presp; 1534 u8 *pos, *end; 1535 1536 sdata_assert_lock(sdata); 1537 1538 presp = rcu_dereference_protected(ifibss->presp, 1539 lockdep_is_held(&sdata->wdev.mtx)); 1540 1541 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1542 len < 24 + 2 || !presp) 1543 return; 1544 1545 tx_last_beacon = drv_tx_last_beacon(local); 1546 1547 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1548 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1549 mgmt->bssid, tx_last_beacon); 1550 1551 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1552 return; 1553 1554 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1555 !is_broadcast_ether_addr(mgmt->bssid)) 1556 return; 1557 1558 end = ((u8 *) mgmt) + len; 1559 pos = mgmt->u.probe_req.variable; 1560 if (pos[0] != WLAN_EID_SSID || 1561 pos + 2 + pos[1] > end) { 1562 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1563 mgmt->sa); 1564 return; 1565 } 1566 if (pos[1] != 0 && 1567 (pos[1] != ifibss->ssid_len || 1568 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1569 /* Ignore ProbeReq for foreign SSID */ 1570 return; 1571 } 1572 1573 /* Reply with ProbeResp */ 1574 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1575 if (!skb) 1576 return; 1577 1578 skb_reserve(skb, local->tx_headroom); 1579 skb_put_data(skb, presp->head, presp->head_len); 1580 1581 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1582 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1583 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1584 1585 /* avoid excessive retries for probe request to wildcard SSIDs */ 1586 if (pos[1] == 0) 1587 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1588 1589 ieee80211_tx_skb(sdata, skb); 1590 } 1591 1592 static 1593 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1594 struct ieee80211_mgmt *mgmt, size_t len, 1595 struct ieee80211_rx_status *rx_status) 1596 { 1597 size_t baselen; 1598 struct ieee802_11_elems elems; 1599 1600 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1601 offsetof(typeof(mgmt->u.beacon), variable)); 1602 1603 /* 1604 * either beacon or probe_resp but the variable field is at the 1605 * same offset 1606 */ 1607 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1608 if (baselen > len) 1609 return; 1610 1611 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1612 false, &elems, mgmt->bssid, NULL); 1613 1614 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1615 } 1616 1617 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1618 struct sk_buff *skb) 1619 { 1620 struct ieee80211_rx_status *rx_status; 1621 struct ieee80211_mgmt *mgmt; 1622 u16 fc; 1623 struct ieee802_11_elems elems; 1624 int ies_len; 1625 1626 rx_status = IEEE80211_SKB_RXCB(skb); 1627 mgmt = (struct ieee80211_mgmt *) skb->data; 1628 fc = le16_to_cpu(mgmt->frame_control); 1629 1630 sdata_lock(sdata); 1631 1632 if (!sdata->u.ibss.ssid_len) 1633 goto mgmt_out; /* not ready to merge yet */ 1634 1635 switch (fc & IEEE80211_FCTL_STYPE) { 1636 case IEEE80211_STYPE_PROBE_REQ: 1637 ieee80211_rx_mgmt_probe_req(sdata, skb); 1638 break; 1639 case IEEE80211_STYPE_PROBE_RESP: 1640 case IEEE80211_STYPE_BEACON: 1641 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1642 rx_status); 1643 break; 1644 case IEEE80211_STYPE_AUTH: 1645 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1646 break; 1647 case IEEE80211_STYPE_DEAUTH: 1648 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1649 break; 1650 case IEEE80211_STYPE_ACTION: 1651 switch (mgmt->u.action.category) { 1652 case WLAN_CATEGORY_SPECTRUM_MGMT: 1653 ies_len = skb->len - 1654 offsetof(struct ieee80211_mgmt, 1655 u.action.u.chan_switch.variable); 1656 1657 if (ies_len < 0) 1658 break; 1659 1660 ieee802_11_parse_elems( 1661 mgmt->u.action.u.chan_switch.variable, 1662 ies_len, true, &elems, mgmt->bssid, NULL); 1663 1664 if (elems.parse_error) 1665 break; 1666 1667 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1668 rx_status, &elems); 1669 break; 1670 } 1671 } 1672 1673 mgmt_out: 1674 sdata_unlock(sdata); 1675 } 1676 1677 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1678 { 1679 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1680 struct sta_info *sta; 1681 1682 sdata_lock(sdata); 1683 1684 /* 1685 * Work could be scheduled after scan or similar 1686 * when we aren't even joined (or trying) with a 1687 * network. 1688 */ 1689 if (!ifibss->ssid_len) 1690 goto out; 1691 1692 spin_lock_bh(&ifibss->incomplete_lock); 1693 while (!list_empty(&ifibss->incomplete_stations)) { 1694 sta = list_first_entry(&ifibss->incomplete_stations, 1695 struct sta_info, list); 1696 list_del(&sta->list); 1697 spin_unlock_bh(&ifibss->incomplete_lock); 1698 1699 ieee80211_ibss_finish_sta(sta); 1700 rcu_read_unlock(); 1701 spin_lock_bh(&ifibss->incomplete_lock); 1702 } 1703 spin_unlock_bh(&ifibss->incomplete_lock); 1704 1705 switch (ifibss->state) { 1706 case IEEE80211_IBSS_MLME_SEARCH: 1707 ieee80211_sta_find_ibss(sdata); 1708 break; 1709 case IEEE80211_IBSS_MLME_JOINED: 1710 ieee80211_sta_merge_ibss(sdata); 1711 break; 1712 default: 1713 WARN_ON(1); 1714 break; 1715 } 1716 1717 out: 1718 sdata_unlock(sdata); 1719 } 1720 1721 static void ieee80211_ibss_timer(struct timer_list *t) 1722 { 1723 struct ieee80211_sub_if_data *sdata = 1724 from_timer(sdata, t, u.ibss.timer); 1725 1726 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1727 } 1728 1729 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1730 { 1731 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1732 1733 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1734 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1735 spin_lock_init(&ifibss->incomplete_lock); 1736 INIT_WORK(&ifibss->csa_connection_drop_work, 1737 ieee80211_csa_connection_drop_work); 1738 } 1739 1740 /* scan finished notification */ 1741 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1742 { 1743 struct ieee80211_sub_if_data *sdata; 1744 1745 mutex_lock(&local->iflist_mtx); 1746 list_for_each_entry(sdata, &local->interfaces, list) { 1747 if (!ieee80211_sdata_running(sdata)) 1748 continue; 1749 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1750 continue; 1751 sdata->u.ibss.last_scan_completed = jiffies; 1752 } 1753 mutex_unlock(&local->iflist_mtx); 1754 } 1755 1756 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1757 struct cfg80211_ibss_params *params) 1758 { 1759 u32 changed = 0; 1760 u32 rate_flags; 1761 struct ieee80211_supported_band *sband; 1762 enum ieee80211_chanctx_mode chanmode; 1763 struct ieee80211_local *local = sdata->local; 1764 int radar_detect_width = 0; 1765 int i; 1766 int ret; 1767 1768 if (params->chandef.chan->freq_offset) { 1769 /* this may work, but is untested */ 1770 return -EOPNOTSUPP; 1771 } 1772 1773 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1774 ¶ms->chandef, 1775 sdata->wdev.iftype); 1776 if (ret < 0) 1777 return ret; 1778 1779 if (ret > 0) { 1780 if (!params->userspace_handles_dfs) 1781 return -EINVAL; 1782 radar_detect_width = BIT(params->chandef.width); 1783 } 1784 1785 chanmode = (params->channel_fixed && !ret) ? 1786 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1787 1788 mutex_lock(&local->chanctx_mtx); 1789 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1790 radar_detect_width); 1791 mutex_unlock(&local->chanctx_mtx); 1792 if (ret < 0) 1793 return ret; 1794 1795 if (params->bssid) { 1796 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1797 sdata->u.ibss.fixed_bssid = true; 1798 } else 1799 sdata->u.ibss.fixed_bssid = false; 1800 1801 sdata->u.ibss.privacy = params->privacy; 1802 sdata->u.ibss.control_port = params->control_port; 1803 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1804 sdata->u.ibss.basic_rates = params->basic_rates; 1805 sdata->u.ibss.last_scan_completed = jiffies; 1806 1807 /* fix basic_rates if channel does not support these rates */ 1808 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1809 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1810 for (i = 0; i < sband->n_bitrates; i++) { 1811 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1812 sdata->u.ibss.basic_rates &= ~BIT(i); 1813 } 1814 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1815 sizeof(params->mcast_rate)); 1816 1817 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1818 1819 sdata->u.ibss.chandef = params->chandef; 1820 sdata->u.ibss.fixed_channel = params->channel_fixed; 1821 1822 if (params->ie) { 1823 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1824 GFP_KERNEL); 1825 if (sdata->u.ibss.ie) 1826 sdata->u.ibss.ie_len = params->ie_len; 1827 } 1828 1829 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1830 sdata->u.ibss.ibss_join_req = jiffies; 1831 1832 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1833 sdata->u.ibss.ssid_len = params->ssid_len; 1834 1835 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1836 sizeof(sdata->u.ibss.ht_capa)); 1837 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1838 sizeof(sdata->u.ibss.ht_capa_mask)); 1839 1840 /* 1841 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1842 * reserved, but an HT STA shall protect HT transmissions as though 1843 * the HT Protection field were set to non-HT mixed mode. 1844 * 1845 * In an IBSS, the RIFS Mode field of the HT Operation element is 1846 * also reserved, but an HT STA shall operate as though this field 1847 * were set to 1. 1848 */ 1849 1850 sdata->vif.bss_conf.ht_operation_mode |= 1851 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1852 | IEEE80211_HT_PARAM_RIFS_MODE; 1853 1854 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1855 ieee80211_bss_info_change_notify(sdata, changed); 1856 1857 sdata->smps_mode = IEEE80211_SMPS_OFF; 1858 sdata->needed_rx_chains = local->rx_chains; 1859 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1860 1861 ieee80211_queue_work(&local->hw, &sdata->work); 1862 1863 return 0; 1864 } 1865 1866 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1867 { 1868 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1869 1870 ieee80211_ibss_disconnect(sdata); 1871 ifibss->ssid_len = 0; 1872 eth_zero_addr(ifibss->bssid); 1873 1874 /* remove beacon */ 1875 kfree(sdata->u.ibss.ie); 1876 1877 /* on the next join, re-program HT parameters */ 1878 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1879 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1880 1881 synchronize_rcu(); 1882 1883 skb_queue_purge(&sdata->skb_queue); 1884 1885 del_timer_sync(&sdata->u.ibss.timer); 1886 1887 return 0; 1888 } 1889