1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IBSS mode implementation 4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 5 * Copyright 2004, Instant802 Networks, Inc. 6 * Copyright 2005, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 10 * Copyright 2013-2014 Intel Mobile Communications GmbH 11 * Copyright(c) 2016 Intel Deutschland GmbH 12 * Copyright(c) 2018-2023 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 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 u64 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.cfg.ibss_joined) { 248 sdata->vif.cfg.ibss_joined = false; 249 sdata->vif.cfg.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 = sdata_dereference(ifibss->presp, sdata); 259 RCU_INIT_POINTER(ifibss->presp, NULL); 260 if (presp) 261 kfree_rcu(presp, rcu_head); 262 263 /* make a copy of the chandef, it could be modified below. */ 264 chandef = *req_chandef; 265 chan = chandef.chan; 266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 267 NL80211_IFTYPE_ADHOC)) { 268 if (chandef.width == NL80211_CHAN_WIDTH_5 || 269 chandef.width == NL80211_CHAN_WIDTH_10 || 270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 271 chandef.width == NL80211_CHAN_WIDTH_20) { 272 sdata_info(sdata, 273 "Failed to join IBSS, beacons forbidden\n"); 274 return; 275 } 276 chandef.width = NL80211_CHAN_WIDTH_20; 277 chandef.center_freq1 = chan->center_freq; 278 /* check again for downgraded chandef */ 279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 280 NL80211_IFTYPE_ADHOC)) { 281 sdata_info(sdata, 282 "Failed to join IBSS, beacons forbidden\n"); 283 return; 284 } 285 } 286 287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 288 &chandef, NL80211_IFTYPE_ADHOC); 289 if (err < 0) { 290 sdata_info(sdata, 291 "Failed to join IBSS, invalid chandef\n"); 292 return; 293 } 294 if (err > 0 && !ifibss->userspace_handles_dfs) { 295 sdata_info(sdata, 296 "Failed to join IBSS, DFS channel without control program\n"); 297 return; 298 } 299 300 radar_required = err; 301 302 mutex_lock(&local->mtx); 303 if (ieee80211_link_use_channel(&sdata->deflink, &chandef, 304 ifibss->fixed_channel ? 305 IEEE80211_CHANCTX_SHARED : 306 IEEE80211_CHANCTX_EXCLUSIVE)) { 307 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 308 mutex_unlock(&local->mtx); 309 return; 310 } 311 sdata->deflink.radar_required = radar_required; 312 mutex_unlock(&local->mtx); 313 314 memcpy(ifibss->bssid, bssid, ETH_ALEN); 315 316 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 317 capability, tsf, &chandef, 318 &have_higher_than_11mbit, NULL); 319 if (!presp) 320 return; 321 322 rcu_assign_pointer(ifibss->presp, presp); 323 mgmt = (void *)presp->head; 324 325 sdata->vif.bss_conf.enable_beacon = true; 326 sdata->vif.bss_conf.beacon_int = beacon_int; 327 sdata->vif.bss_conf.basic_rates = basic_rates; 328 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 329 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 330 bss_change = BSS_CHANGED_BEACON_INT; 331 bss_change |= ieee80211_reset_erp_info(sdata); 332 bss_change |= BSS_CHANGED_BSSID; 333 bss_change |= BSS_CHANGED_BEACON; 334 bss_change |= BSS_CHANGED_BEACON_ENABLED; 335 bss_change |= BSS_CHANGED_BASIC_RATES; 336 bss_change |= BSS_CHANGED_HT; 337 bss_change |= BSS_CHANGED_IBSS; 338 bss_change |= BSS_CHANGED_SSID; 339 340 /* 341 * In 5 GHz/802.11a, we can always use short slot time. 342 * (IEEE 802.11-2012 18.3.8.7) 343 * 344 * In 2.4GHz, we must always use long slots in IBSS for compatibility 345 * reasons. 346 * (IEEE 802.11-2012 19.4.5) 347 * 348 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 349 */ 350 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 351 bss_change |= BSS_CHANGED_ERP_SLOT; 352 353 /* cf. IEEE 802.11 9.2.12 */ 354 sdata->deflink.operating_11g_mode = 355 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 356 357 ieee80211_set_wmm_default(&sdata->deflink, true, false); 358 359 sdata->vif.cfg.ibss_joined = true; 360 sdata->vif.cfg.ibss_creator = creator; 361 362 err = drv_join_ibss(local, sdata); 363 if (err) { 364 sdata->vif.cfg.ibss_joined = false; 365 sdata->vif.cfg.ibss_creator = false; 366 sdata->vif.bss_conf.enable_beacon = false; 367 sdata->vif.cfg.ssid_len = 0; 368 RCU_INIT_POINTER(ifibss->presp, NULL); 369 kfree_rcu(presp, rcu_head); 370 mutex_lock(&local->mtx); 371 ieee80211_link_release_channel(&sdata->deflink); 372 mutex_unlock(&local->mtx); 373 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 374 err); 375 return; 376 } 377 378 ieee80211_bss_info_change_notify(sdata, bss_change); 379 380 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 381 mod_timer(&ifibss->timer, 382 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 383 384 bss_meta.chan = chan; 385 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 386 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 387 presp->head_len, GFP_KERNEL); 388 389 cfg80211_put_bss(local->hw.wiphy, bss); 390 netif_carrier_on(sdata->dev); 391 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 392 } 393 394 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 395 struct ieee80211_bss *bss) 396 { 397 struct cfg80211_bss *cbss = 398 container_of((void *)bss, struct cfg80211_bss, priv); 399 struct ieee80211_supported_band *sband; 400 struct cfg80211_chan_def chandef; 401 u32 basic_rates; 402 int i, j; 403 u16 beacon_int = cbss->beacon_interval; 404 const struct cfg80211_bss_ies *ies; 405 enum nl80211_channel_type chan_type; 406 u64 tsf; 407 u32 rate_flags; 408 int shift; 409 410 sdata_assert_lock(sdata); 411 412 if (beacon_int < 10) 413 beacon_int = 10; 414 415 switch (sdata->u.ibss.chandef.width) { 416 case NL80211_CHAN_WIDTH_20_NOHT: 417 case NL80211_CHAN_WIDTH_20: 418 case NL80211_CHAN_WIDTH_40: 419 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 420 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 421 break; 422 case NL80211_CHAN_WIDTH_5: 423 case NL80211_CHAN_WIDTH_10: 424 cfg80211_chandef_create(&chandef, cbss->channel, 425 NL80211_CHAN_NO_HT); 426 chandef.width = sdata->u.ibss.chandef.width; 427 break; 428 case NL80211_CHAN_WIDTH_80: 429 case NL80211_CHAN_WIDTH_80P80: 430 case NL80211_CHAN_WIDTH_160: 431 chandef = sdata->u.ibss.chandef; 432 chandef.chan = cbss->channel; 433 break; 434 default: 435 /* fall back to 20 MHz for unsupported modes */ 436 cfg80211_chandef_create(&chandef, cbss->channel, 437 NL80211_CHAN_NO_HT); 438 break; 439 } 440 441 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 442 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 443 shift = ieee80211_vif_get_shift(&sdata->vif); 444 445 basic_rates = 0; 446 447 for (i = 0; i < bss->supp_rates_len; i++) { 448 int rate = bss->supp_rates[i] & 0x7f; 449 bool is_basic = !!(bss->supp_rates[i] & 0x80); 450 451 for (j = 0; j < sband->n_bitrates; j++) { 452 int brate; 453 if ((rate_flags & sband->bitrates[j].flags) 454 != rate_flags) 455 continue; 456 457 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 458 5 * (1 << shift)); 459 if (brate == rate) { 460 if (is_basic) 461 basic_rates |= BIT(j); 462 break; 463 } 464 } 465 } 466 467 rcu_read_lock(); 468 ies = rcu_dereference(cbss->ies); 469 tsf = ies->tsf; 470 rcu_read_unlock(); 471 472 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 473 beacon_int, 474 &chandef, 475 basic_rates, 476 cbss->capability, 477 tsf, false); 478 } 479 480 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 481 struct cfg80211_csa_settings *csa_settings, 482 u64 *changed) 483 { 484 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 485 struct beacon_data *presp, *old_presp; 486 struct cfg80211_bss *cbss; 487 const struct cfg80211_bss_ies *ies; 488 u16 capability = WLAN_CAPABILITY_IBSS; 489 u64 tsf; 490 491 sdata_assert_lock(sdata); 492 493 if (ifibss->privacy) 494 capability |= WLAN_CAPABILITY_PRIVACY; 495 496 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 497 ifibss->bssid, ifibss->ssid, 498 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 499 IEEE80211_PRIVACY(ifibss->privacy)); 500 501 if (WARN_ON(!cbss)) 502 return -EINVAL; 503 504 rcu_read_lock(); 505 ies = rcu_dereference(cbss->ies); 506 tsf = ies->tsf; 507 rcu_read_unlock(); 508 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 509 510 old_presp = sdata_dereference(ifibss->presp, sdata); 511 512 presp = ieee80211_ibss_build_presp(sdata, 513 sdata->vif.bss_conf.beacon_int, 514 sdata->vif.bss_conf.basic_rates, 515 capability, tsf, &ifibss->chandef, 516 NULL, csa_settings); 517 if (!presp) 518 return -ENOMEM; 519 520 rcu_assign_pointer(ifibss->presp, presp); 521 if (old_presp) 522 kfree_rcu(old_presp, rcu_head); 523 524 *changed |= BSS_CHANGED_BEACON; 525 return 0; 526 } 527 528 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 529 { 530 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 531 struct cfg80211_bss *cbss; 532 533 sdata_assert_lock(sdata); 534 535 /* When not connected/joined, sending CSA doesn't make sense. */ 536 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 537 return -ENOLINK; 538 539 /* update cfg80211 bss information with the new channel */ 540 if (!is_zero_ether_addr(ifibss->bssid)) { 541 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 542 ifibss->chandef.chan, 543 ifibss->bssid, ifibss->ssid, 544 ifibss->ssid_len, 545 IEEE80211_BSS_TYPE_IBSS, 546 IEEE80211_PRIVACY(ifibss->privacy)); 547 /* XXX: should not really modify cfg80211 data */ 548 if (cbss) { 549 cbss->channel = sdata->deflink.csa_chandef.chan; 550 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 551 } 552 } 553 554 ifibss->chandef = sdata->deflink.csa_chandef; 555 556 /* generate the beacon */ 557 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 558 } 559 560 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 561 { 562 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 563 564 wiphy_work_cancel(sdata->local->hw.wiphy, 565 &ifibss->csa_connection_drop_work); 566 } 567 568 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 569 __acquires(RCU) 570 { 571 struct ieee80211_sub_if_data *sdata = sta->sdata; 572 u8 addr[ETH_ALEN]; 573 574 memcpy(addr, sta->sta.addr, ETH_ALEN); 575 576 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 577 578 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 579 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 580 /* authorize the station only if the network is not RSN protected. If 581 * not wait for the userspace to authorize it */ 582 if (!sta->sdata->u.ibss.control_port) 583 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 584 585 rate_control_rate_init(sta); 586 587 /* If it fails, maybe we raced another insertion? */ 588 if (sta_info_insert_rcu(sta)) 589 return sta_info_get(sdata, addr); 590 return sta; 591 } 592 593 static struct sta_info * 594 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 595 const u8 *addr, u32 supp_rates) 596 __acquires(RCU) 597 { 598 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 599 struct ieee80211_local *local = sdata->local; 600 struct sta_info *sta; 601 struct ieee80211_chanctx_conf *chanctx_conf; 602 struct ieee80211_supported_band *sband; 603 enum nl80211_bss_scan_width scan_width; 604 int band; 605 606 /* 607 * XXX: Consider removing the least recently used entry and 608 * allow new one to be added. 609 */ 610 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 611 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 612 sdata->name, addr); 613 rcu_read_lock(); 614 return NULL; 615 } 616 617 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 618 rcu_read_lock(); 619 return NULL; 620 } 621 622 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 623 rcu_read_lock(); 624 return NULL; 625 } 626 627 rcu_read_lock(); 628 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 629 if (WARN_ON_ONCE(!chanctx_conf)) 630 return NULL; 631 band = chanctx_conf->def.chan->band; 632 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 633 rcu_read_unlock(); 634 635 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 636 if (!sta) { 637 rcu_read_lock(); 638 return NULL; 639 } 640 641 /* make sure mandatory rates are always added */ 642 sband = local->hw.wiphy->bands[band]; 643 sta->sta.deflink.supp_rates[band] = supp_rates | 644 ieee80211_mandatory_rates(sband, scan_width); 645 646 return ieee80211_ibss_finish_sta(sta); 647 } 648 649 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 650 { 651 struct ieee80211_local *local = sdata->local; 652 int active = 0; 653 struct sta_info *sta; 654 655 sdata_assert_lock(sdata); 656 657 rcu_read_lock(); 658 659 list_for_each_entry_rcu(sta, &local->sta_list, list) { 660 unsigned long last_active = ieee80211_sta_last_active(sta); 661 662 if (sta->sdata == sdata && 663 time_is_after_jiffies(last_active + 664 IEEE80211_IBSS_MERGE_INTERVAL)) { 665 active++; 666 break; 667 } 668 } 669 670 rcu_read_unlock(); 671 672 return active; 673 } 674 675 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 676 { 677 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 678 struct ieee80211_local *local = sdata->local; 679 struct cfg80211_bss *cbss; 680 struct beacon_data *presp; 681 struct sta_info *sta; 682 683 if (!is_zero_ether_addr(ifibss->bssid)) { 684 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 685 ifibss->bssid, ifibss->ssid, 686 ifibss->ssid_len, 687 IEEE80211_BSS_TYPE_IBSS, 688 IEEE80211_PRIVACY(ifibss->privacy)); 689 690 if (cbss) { 691 cfg80211_unlink_bss(local->hw.wiphy, cbss); 692 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 693 } 694 } 695 696 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 697 698 sta_info_flush(sdata); 699 700 spin_lock_bh(&ifibss->incomplete_lock); 701 while (!list_empty(&ifibss->incomplete_stations)) { 702 sta = list_first_entry(&ifibss->incomplete_stations, 703 struct sta_info, list); 704 list_del(&sta->list); 705 spin_unlock_bh(&ifibss->incomplete_lock); 706 707 sta_info_free(local, sta); 708 spin_lock_bh(&ifibss->incomplete_lock); 709 } 710 spin_unlock_bh(&ifibss->incomplete_lock); 711 712 netif_carrier_off(sdata->dev); 713 714 sdata->vif.cfg.ibss_joined = false; 715 sdata->vif.cfg.ibss_creator = false; 716 sdata->vif.bss_conf.enable_beacon = false; 717 sdata->vif.cfg.ssid_len = 0; 718 719 /* remove beacon */ 720 presp = sdata_dereference(ifibss->presp, sdata); 721 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 722 if (presp) 723 kfree_rcu(presp, rcu_head); 724 725 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 726 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 727 BSS_CHANGED_IBSS); 728 drv_leave_ibss(local, sdata); 729 mutex_lock(&local->mtx); 730 ieee80211_link_release_channel(&sdata->deflink); 731 mutex_unlock(&local->mtx); 732 } 733 734 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 735 struct wiphy_work *work) 736 { 737 struct ieee80211_sub_if_data *sdata = 738 container_of(work, struct ieee80211_sub_if_data, 739 u.ibss.csa_connection_drop_work); 740 741 sdata_lock(sdata); 742 743 ieee80211_ibss_disconnect(sdata); 744 synchronize_rcu(); 745 skb_queue_purge(&sdata->skb_queue); 746 747 /* trigger a scan to find another IBSS network to join */ 748 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 749 750 sdata_unlock(sdata); 751 } 752 753 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 754 { 755 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 756 int err; 757 758 /* if the current channel is a DFS channel, mark the channel as 759 * unavailable. 760 */ 761 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 762 &ifibss->chandef, 763 NL80211_IFTYPE_ADHOC); 764 if (err > 0) 765 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 766 GFP_ATOMIC); 767 } 768 769 static bool 770 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 771 struct ieee802_11_elems *elems, 772 bool beacon) 773 { 774 struct cfg80211_csa_settings params; 775 struct ieee80211_csa_ie csa_ie; 776 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 777 enum nl80211_channel_type ch_type; 778 int err; 779 ieee80211_conn_flags_t conn_flags; 780 u32 vht_cap_info = 0; 781 782 sdata_assert_lock(sdata); 783 784 conn_flags = IEEE80211_CONN_DISABLE_VHT; 785 786 switch (ifibss->chandef.width) { 787 case NL80211_CHAN_WIDTH_5: 788 case NL80211_CHAN_WIDTH_10: 789 case NL80211_CHAN_WIDTH_20_NOHT: 790 conn_flags |= IEEE80211_CONN_DISABLE_HT; 791 fallthrough; 792 case NL80211_CHAN_WIDTH_20: 793 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ; 794 break; 795 default: 796 break; 797 } 798 799 if (elems->vht_cap_elem) 800 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 801 802 memset(¶ms, 0, sizeof(params)); 803 err = ieee80211_parse_ch_switch_ie(sdata, elems, 804 ifibss->chandef.chan->band, 805 vht_cap_info, 806 conn_flags, ifibss->bssid, &csa_ie); 807 /* can't switch to destination channel, fail */ 808 if (err < 0) 809 goto disconnect; 810 811 /* did not contain a CSA */ 812 if (err) 813 return false; 814 815 /* channel switch is not supported, disconnect */ 816 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 817 goto disconnect; 818 819 params.count = csa_ie.count; 820 params.chandef = csa_ie.chandef; 821 822 switch (ifibss->chandef.width) { 823 case NL80211_CHAN_WIDTH_20_NOHT: 824 case NL80211_CHAN_WIDTH_20: 825 case NL80211_CHAN_WIDTH_40: 826 /* keep our current HT mode (HT20/HT40+/HT40-), even if 827 * another mode has been announced. The mode is not adopted 828 * within the beacon while doing CSA and we should therefore 829 * keep the mode which we announce. 830 */ 831 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 832 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 833 ch_type); 834 break; 835 case NL80211_CHAN_WIDTH_5: 836 case NL80211_CHAN_WIDTH_10: 837 if (params.chandef.width != ifibss->chandef.width) { 838 sdata_info(sdata, 839 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 840 ifibss->bssid, 841 params.chandef.chan->center_freq, 842 params.chandef.width, 843 params.chandef.center_freq1, 844 params.chandef.center_freq2); 845 goto disconnect; 846 } 847 break; 848 default: 849 /* should not happen, conn_flags should prevent VHT modes. */ 850 WARN_ON(1); 851 goto disconnect; 852 } 853 854 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 855 NL80211_IFTYPE_ADHOC)) { 856 sdata_info(sdata, 857 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 858 ifibss->bssid, 859 params.chandef.chan->center_freq, 860 params.chandef.width, 861 params.chandef.center_freq1, 862 params.chandef.center_freq2); 863 goto disconnect; 864 } 865 866 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 867 ¶ms.chandef, 868 NL80211_IFTYPE_ADHOC); 869 if (err < 0) 870 goto disconnect; 871 if (err > 0 && !ifibss->userspace_handles_dfs) { 872 /* IBSS-DFS only allowed with a control program */ 873 goto disconnect; 874 } 875 876 params.radar_required = err; 877 878 if (cfg80211_chandef_identical(¶ms.chandef, 879 &sdata->vif.bss_conf.chandef)) { 880 ibss_dbg(sdata, 881 "received csa with an identical chandef, ignoring\n"); 882 return true; 883 } 884 885 /* all checks done, now perform the channel switch. */ 886 ibss_dbg(sdata, 887 "received channel switch announcement to go to channel %d MHz\n", 888 params.chandef.chan->center_freq); 889 890 params.block_tx = !!csa_ie.mode; 891 892 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 893 ¶ms)) 894 goto disconnect; 895 896 ieee80211_ibss_csa_mark_radar(sdata); 897 898 return true; 899 disconnect: 900 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 901 wiphy_work_queue(sdata->local->hw.wiphy, 902 &ifibss->csa_connection_drop_work); 903 904 ieee80211_ibss_csa_mark_radar(sdata); 905 906 return true; 907 } 908 909 static void 910 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 911 struct ieee80211_mgmt *mgmt, size_t len, 912 struct ieee80211_rx_status *rx_status, 913 struct ieee802_11_elems *elems) 914 { 915 int required_len; 916 917 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 918 return; 919 920 /* CSA is the only action we handle for now */ 921 if (mgmt->u.action.u.measurement.action_code != 922 WLAN_ACTION_SPCT_CHL_SWITCH) 923 return; 924 925 required_len = IEEE80211_MIN_ACTION_SIZE + 926 sizeof(mgmt->u.action.u.chan_switch); 927 if (len < required_len) 928 return; 929 930 if (!sdata->vif.bss_conf.csa_active) 931 ieee80211_ibss_process_chanswitch(sdata, elems, false); 932 } 933 934 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 935 struct ieee80211_mgmt *mgmt, 936 size_t len) 937 { 938 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 939 940 if (len < IEEE80211_DEAUTH_FRAME_LEN) 941 return; 942 943 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 944 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 945 sta_info_destroy_addr(sdata, mgmt->sa); 946 } 947 948 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 949 struct ieee80211_mgmt *mgmt, 950 size_t len) 951 { 952 u16 auth_alg, auth_transaction; 953 954 sdata_assert_lock(sdata); 955 956 if (len < 24 + 6) 957 return; 958 959 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 960 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 961 962 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 963 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 964 mgmt->bssid, auth_transaction); 965 966 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 967 return; 968 969 /* 970 * IEEE 802.11 standard does not require authentication in IBSS 971 * networks and most implementations do not seem to use it. 972 * However, try to reply to authentication attempts if someone 973 * has actually implemented this. 974 */ 975 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 976 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 977 } 978 979 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 980 struct ieee80211_mgmt *mgmt, size_t len, 981 struct ieee80211_rx_status *rx_status, 982 struct ieee802_11_elems *elems, 983 struct ieee80211_channel *channel) 984 { 985 struct sta_info *sta; 986 enum nl80211_band band = rx_status->band; 987 enum nl80211_bss_scan_width scan_width; 988 struct ieee80211_local *local = sdata->local; 989 struct ieee80211_supported_band *sband; 990 bool rates_updated = false; 991 u32 supp_rates = 0; 992 993 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 994 return; 995 996 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 997 return; 998 999 sband = local->hw.wiphy->bands[band]; 1000 if (WARN_ON(!sband)) 1001 return; 1002 1003 rcu_read_lock(); 1004 sta = sta_info_get(sdata, mgmt->sa); 1005 1006 if (elems->supp_rates) { 1007 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1008 band, NULL); 1009 if (sta) { 1010 u32 prev_rates; 1011 1012 prev_rates = sta->sta.deflink.supp_rates[band]; 1013 /* make sure mandatory rates are always added */ 1014 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1015 if (rx_status->bw == RATE_INFO_BW_5) 1016 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1017 else if (rx_status->bw == RATE_INFO_BW_10) 1018 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1019 1020 sta->sta.deflink.supp_rates[band] = supp_rates | 1021 ieee80211_mandatory_rates(sband, scan_width); 1022 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 1023 ibss_dbg(sdata, 1024 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1025 sta->sta.addr, prev_rates, 1026 sta->sta.deflink.supp_rates[band]); 1027 rates_updated = true; 1028 } 1029 } else { 1030 rcu_read_unlock(); 1031 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1032 mgmt->sa, supp_rates); 1033 } 1034 } 1035 1036 if (sta && !sta->sta.wme && 1037 (elems->wmm_info || elems->s1g_capab) && 1038 local->hw.queues >= IEEE80211_NUM_ACS) { 1039 sta->sta.wme = true; 1040 ieee80211_check_fast_xmit(sta); 1041 } 1042 1043 if (sta && elems->ht_operation && elems->ht_cap_elem && 1044 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1045 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1046 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1047 /* we both use HT */ 1048 struct ieee80211_ht_cap htcap_ie; 1049 struct cfg80211_chan_def chandef; 1050 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1051 1052 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1053 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1054 1055 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1056 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1057 &htcap_ie, 1058 &sta->deflink); 1059 1060 if (elems->vht_operation && elems->vht_cap_elem && 1061 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1062 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1063 /* we both use VHT */ 1064 struct ieee80211_vht_cap cap_ie; 1065 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1066 u32 vht_cap_info = 1067 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1068 1069 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1070 elems->vht_operation, 1071 elems->ht_operation, 1072 &chandef); 1073 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1074 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1075 &cap_ie, NULL, 1076 &sta->deflink); 1077 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1078 rates_updated |= true; 1079 } 1080 1081 if (bw != sta->sta.deflink.bandwidth) 1082 rates_updated |= true; 1083 1084 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1085 &chandef)) 1086 WARN_ON_ONCE(1); 1087 } 1088 1089 if (sta && rates_updated) { 1090 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1091 u8 rx_nss = sta->sta.deflink.rx_nss; 1092 1093 /* Force rx_nss recalculation */ 1094 sta->sta.deflink.rx_nss = 0; 1095 rate_control_rate_init(sta); 1096 if (sta->sta.deflink.rx_nss != rx_nss) 1097 changed |= IEEE80211_RC_NSS_CHANGED; 1098 1099 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1100 } 1101 1102 rcu_read_unlock(); 1103 } 1104 1105 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1106 struct ieee80211_mgmt *mgmt, size_t len, 1107 struct ieee80211_rx_status *rx_status, 1108 struct ieee802_11_elems *elems) 1109 { 1110 struct ieee80211_local *local = sdata->local; 1111 struct cfg80211_bss *cbss; 1112 struct ieee80211_bss *bss; 1113 struct ieee80211_channel *channel; 1114 u64 beacon_timestamp, rx_timestamp; 1115 u32 supp_rates = 0; 1116 enum nl80211_band band = rx_status->band; 1117 1118 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1119 if (!channel) 1120 return; 1121 1122 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1123 1124 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1125 if (!bss) 1126 return; 1127 1128 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1129 1130 /* same for beacon and probe response */ 1131 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1132 1133 /* check if we need to merge IBSS */ 1134 1135 /* not an IBSS */ 1136 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1137 goto put_bss; 1138 1139 /* different channel */ 1140 if (sdata->u.ibss.fixed_channel && 1141 sdata->u.ibss.chandef.chan != cbss->channel) 1142 goto put_bss; 1143 1144 /* different SSID */ 1145 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1146 memcmp(elems->ssid, sdata->u.ibss.ssid, 1147 sdata->u.ibss.ssid_len)) 1148 goto put_bss; 1149 1150 /* process channel switch */ 1151 if (sdata->vif.bss_conf.csa_active || 1152 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1153 goto put_bss; 1154 1155 /* same BSSID */ 1156 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1157 goto put_bss; 1158 1159 /* we use a fixed BSSID */ 1160 if (sdata->u.ibss.fixed_bssid) 1161 goto put_bss; 1162 1163 if (ieee80211_have_rx_timestamp(rx_status)) { 1164 /* time when timestamp field was received */ 1165 rx_timestamp = 1166 ieee80211_calculate_rx_timestamp(local, rx_status, 1167 len + FCS_LEN, 24); 1168 } else { 1169 /* 1170 * second best option: get current TSF 1171 * (will return -1 if not supported) 1172 */ 1173 rx_timestamp = drv_get_tsf(local, sdata); 1174 } 1175 1176 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1177 mgmt->sa, mgmt->bssid, 1178 (unsigned long long)rx_timestamp); 1179 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1180 (unsigned long long)beacon_timestamp, 1181 (unsigned long long)(rx_timestamp - beacon_timestamp), 1182 jiffies); 1183 1184 if (beacon_timestamp > rx_timestamp) { 1185 ibss_dbg(sdata, 1186 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1187 mgmt->bssid); 1188 ieee80211_sta_join_ibss(sdata, bss); 1189 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1190 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1191 supp_rates); 1192 rcu_read_unlock(); 1193 } 1194 1195 put_bss: 1196 ieee80211_rx_bss_put(local, bss); 1197 } 1198 1199 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1200 const u8 *bssid, const u8 *addr, 1201 u32 supp_rates) 1202 { 1203 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1204 struct ieee80211_local *local = sdata->local; 1205 struct sta_info *sta; 1206 struct ieee80211_chanctx_conf *chanctx_conf; 1207 struct ieee80211_supported_band *sband; 1208 enum nl80211_bss_scan_width scan_width; 1209 int band; 1210 1211 /* 1212 * XXX: Consider removing the least recently used entry and 1213 * allow new one to be added. 1214 */ 1215 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1216 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1217 sdata->name, addr); 1218 return; 1219 } 1220 1221 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1222 return; 1223 1224 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1225 return; 1226 1227 rcu_read_lock(); 1228 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1229 if (WARN_ON_ONCE(!chanctx_conf)) { 1230 rcu_read_unlock(); 1231 return; 1232 } 1233 band = chanctx_conf->def.chan->band; 1234 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1235 rcu_read_unlock(); 1236 1237 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1238 if (!sta) 1239 return; 1240 1241 /* make sure mandatory rates are always added */ 1242 sband = local->hw.wiphy->bands[band]; 1243 sta->sta.deflink.supp_rates[band] = supp_rates | 1244 ieee80211_mandatory_rates(sband, scan_width); 1245 1246 spin_lock(&ifibss->incomplete_lock); 1247 list_add(&sta->list, &ifibss->incomplete_stations); 1248 spin_unlock(&ifibss->incomplete_lock); 1249 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1250 } 1251 1252 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1253 { 1254 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1255 struct ieee80211_local *local = sdata->local; 1256 struct sta_info *sta, *tmp; 1257 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1258 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1259 1260 mutex_lock(&local->sta_mtx); 1261 1262 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1263 unsigned long last_active = ieee80211_sta_last_active(sta); 1264 1265 if (sdata != sta->sdata) 1266 continue; 1267 1268 if (time_is_before_jiffies(last_active + exp_time) || 1269 (time_is_before_jiffies(last_active + exp_rsn) && 1270 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1271 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1272 1273 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1274 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1275 "not authorized " : "", sta->sta.addr); 1276 1277 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1278 ifibss->bssid, 1279 IEEE80211_STYPE_DEAUTH, 1280 WLAN_REASON_DEAUTH_LEAVING, 1281 true, frame_buf); 1282 WARN_ON(__sta_info_destroy(sta)); 1283 } 1284 } 1285 1286 mutex_unlock(&local->sta_mtx); 1287 } 1288 1289 /* 1290 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1291 */ 1292 1293 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1294 { 1295 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1296 enum nl80211_bss_scan_width scan_width; 1297 1298 sdata_assert_lock(sdata); 1299 1300 mod_timer(&ifibss->timer, 1301 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1302 1303 ieee80211_ibss_sta_expire(sdata); 1304 1305 if (time_before(jiffies, ifibss->last_scan_completed + 1306 IEEE80211_IBSS_MERGE_INTERVAL)) 1307 return; 1308 1309 if (ieee80211_sta_active_ibss(sdata)) 1310 return; 1311 1312 if (ifibss->fixed_channel) 1313 return; 1314 1315 sdata_info(sdata, 1316 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1317 1318 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1319 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1320 NULL, 0, scan_width); 1321 } 1322 1323 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1324 { 1325 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1326 u8 bssid[ETH_ALEN]; 1327 u16 capability; 1328 int i; 1329 1330 sdata_assert_lock(sdata); 1331 1332 if (ifibss->fixed_bssid) { 1333 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1334 } else { 1335 /* Generate random, not broadcast, locally administered BSSID. Mix in 1336 * own MAC address to make sure that devices that do not have proper 1337 * random number generator get different BSSID. */ 1338 get_random_bytes(bssid, ETH_ALEN); 1339 for (i = 0; i < ETH_ALEN; i++) 1340 bssid[i] ^= sdata->vif.addr[i]; 1341 bssid[0] &= ~0x01; 1342 bssid[0] |= 0x02; 1343 } 1344 1345 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1346 1347 capability = WLAN_CAPABILITY_IBSS; 1348 1349 if (ifibss->privacy) 1350 capability |= WLAN_CAPABILITY_PRIVACY; 1351 1352 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1353 &ifibss->chandef, ifibss->basic_rates, 1354 capability, 0, true); 1355 } 1356 1357 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1358 struct ieee80211_channel **channels, 1359 unsigned int channels_max, 1360 u32 center_freq, u32 width) 1361 { 1362 struct ieee80211_channel *chan = NULL; 1363 unsigned int n_chan = 0; 1364 u32 start_freq, end_freq, freq; 1365 1366 if (width <= 20) { 1367 start_freq = center_freq; 1368 end_freq = center_freq; 1369 } else { 1370 start_freq = center_freq - width / 2 + 10; 1371 end_freq = center_freq + width / 2 - 10; 1372 } 1373 1374 for (freq = start_freq; freq <= end_freq; freq += 20) { 1375 chan = ieee80211_get_channel(wiphy, freq); 1376 if (!chan) 1377 continue; 1378 if (n_chan >= channels_max) 1379 return n_chan; 1380 1381 channels[n_chan] = chan; 1382 n_chan++; 1383 } 1384 1385 return n_chan; 1386 } 1387 1388 static unsigned int 1389 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1390 const struct cfg80211_chan_def *chandef, 1391 struct ieee80211_channel **channels, 1392 unsigned int channels_max) 1393 { 1394 unsigned int n_chan = 0; 1395 u32 width, cf1, cf2 = 0; 1396 1397 switch (chandef->width) { 1398 case NL80211_CHAN_WIDTH_40: 1399 width = 40; 1400 break; 1401 case NL80211_CHAN_WIDTH_80P80: 1402 cf2 = chandef->center_freq2; 1403 fallthrough; 1404 case NL80211_CHAN_WIDTH_80: 1405 width = 80; 1406 break; 1407 case NL80211_CHAN_WIDTH_160: 1408 width = 160; 1409 break; 1410 default: 1411 width = 20; 1412 break; 1413 } 1414 1415 cf1 = chandef->center_freq1; 1416 1417 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1418 1419 if (cf2) 1420 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1421 channels_max - n_chan, cf2, 1422 width); 1423 1424 return n_chan; 1425 } 1426 1427 /* 1428 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1429 */ 1430 1431 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1432 { 1433 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1434 struct ieee80211_local *local = sdata->local; 1435 struct cfg80211_bss *cbss; 1436 struct ieee80211_channel *chan = NULL; 1437 const u8 *bssid = NULL; 1438 enum nl80211_bss_scan_width scan_width; 1439 int active_ibss; 1440 1441 sdata_assert_lock(sdata); 1442 1443 active_ibss = ieee80211_sta_active_ibss(sdata); 1444 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1445 1446 if (active_ibss) 1447 return; 1448 1449 if (ifibss->fixed_bssid) 1450 bssid = ifibss->bssid; 1451 if (ifibss->fixed_channel) 1452 chan = ifibss->chandef.chan; 1453 if (!is_zero_ether_addr(ifibss->bssid)) 1454 bssid = ifibss->bssid; 1455 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1456 ifibss->ssid, ifibss->ssid_len, 1457 IEEE80211_BSS_TYPE_IBSS, 1458 IEEE80211_PRIVACY(ifibss->privacy)); 1459 1460 if (cbss) { 1461 struct ieee80211_bss *bss; 1462 1463 bss = (void *)cbss->priv; 1464 ibss_dbg(sdata, 1465 "sta_find_ibss: selected %pM current %pM\n", 1466 cbss->bssid, ifibss->bssid); 1467 sdata_info(sdata, 1468 "Selected IBSS BSSID %pM based on configured SSID\n", 1469 cbss->bssid); 1470 1471 ieee80211_sta_join_ibss(sdata, bss); 1472 ieee80211_rx_bss_put(local, bss); 1473 return; 1474 } 1475 1476 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1477 * directly and do not waste time scanning 1478 */ 1479 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1480 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1481 bssid); 1482 ieee80211_sta_create_ibss(sdata); 1483 return; 1484 } 1485 1486 1487 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1488 1489 /* Selected IBSS not found in current scan results - try to scan */ 1490 if (time_after(jiffies, ifibss->last_scan_completed + 1491 IEEE80211_SCAN_INTERVAL)) { 1492 struct ieee80211_channel *channels[8]; 1493 unsigned int num; 1494 1495 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1496 1497 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1498 1499 if (ifibss->fixed_channel) { 1500 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1501 &ifibss->chandef, 1502 channels, 1503 ARRAY_SIZE(channels)); 1504 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1505 ifibss->ssid_len, channels, 1506 num, scan_width); 1507 } else { 1508 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1509 ifibss->ssid_len, NULL, 1510 0, scan_width); 1511 } 1512 } else { 1513 int interval = IEEE80211_SCAN_INTERVAL; 1514 1515 if (time_after(jiffies, ifibss->ibss_join_req + 1516 IEEE80211_IBSS_JOIN_TIMEOUT)) 1517 ieee80211_sta_create_ibss(sdata); 1518 1519 mod_timer(&ifibss->timer, 1520 round_jiffies(jiffies + interval)); 1521 } 1522 } 1523 1524 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1525 struct sk_buff *req) 1526 { 1527 struct ieee80211_mgmt *mgmt = (void *)req->data; 1528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1529 struct ieee80211_local *local = sdata->local; 1530 int tx_last_beacon, len = req->len; 1531 struct sk_buff *skb; 1532 struct beacon_data *presp; 1533 u8 *pos, *end; 1534 1535 sdata_assert_lock(sdata); 1536 1537 presp = sdata_dereference(ifibss->presp, sdata); 1538 1539 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1540 len < 24 + 2 || !presp) 1541 return; 1542 1543 tx_last_beacon = drv_tx_last_beacon(local); 1544 1545 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1546 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1547 mgmt->bssid, tx_last_beacon); 1548 1549 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1550 return; 1551 1552 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1553 !is_broadcast_ether_addr(mgmt->bssid)) 1554 return; 1555 1556 end = ((u8 *) mgmt) + len; 1557 pos = mgmt->u.probe_req.variable; 1558 if (pos[0] != WLAN_EID_SSID || 1559 pos + 2 + pos[1] > end) { 1560 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1561 mgmt->sa); 1562 return; 1563 } 1564 if (pos[1] != 0 && 1565 (pos[1] != ifibss->ssid_len || 1566 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1567 /* Ignore ProbeReq for foreign SSID */ 1568 return; 1569 } 1570 1571 /* Reply with ProbeResp */ 1572 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1573 if (!skb) 1574 return; 1575 1576 skb_reserve(skb, local->tx_headroom); 1577 skb_put_data(skb, presp->head, presp->head_len); 1578 1579 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1580 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1582 1583 /* avoid excessive retries for probe request to wildcard SSIDs */ 1584 if (pos[1] == 0) 1585 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1586 1587 ieee80211_tx_skb(sdata, skb); 1588 } 1589 1590 static 1591 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1592 struct ieee80211_mgmt *mgmt, size_t len, 1593 struct ieee80211_rx_status *rx_status) 1594 { 1595 size_t baselen; 1596 struct ieee802_11_elems *elems; 1597 1598 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1599 offsetof(typeof(mgmt->u.beacon), variable)); 1600 1601 /* 1602 * either beacon or probe_resp but the variable field is at the 1603 * same offset 1604 */ 1605 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1606 if (baselen > len) 1607 return; 1608 1609 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1610 len - baselen, false, NULL); 1611 1612 if (elems) { 1613 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1614 kfree(elems); 1615 } 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 elems = ieee802_11_parse_elems( 1662 mgmt->u.action.u.chan_switch.variable, 1663 ies_len, true, NULL); 1664 1665 if (elems && !elems->parse_error) 1666 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1667 skb->len, 1668 rx_status, 1669 elems); 1670 kfree(elems); 1671 break; 1672 } 1673 } 1674 1675 mgmt_out: 1676 sdata_unlock(sdata); 1677 } 1678 1679 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1680 { 1681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1682 struct sta_info *sta; 1683 1684 sdata_lock(sdata); 1685 1686 /* 1687 * Work could be scheduled after scan or similar 1688 * when we aren't even joined (or trying) with a 1689 * network. 1690 */ 1691 if (!ifibss->ssid_len) 1692 goto out; 1693 1694 spin_lock_bh(&ifibss->incomplete_lock); 1695 while (!list_empty(&ifibss->incomplete_stations)) { 1696 sta = list_first_entry(&ifibss->incomplete_stations, 1697 struct sta_info, list); 1698 list_del(&sta->list); 1699 spin_unlock_bh(&ifibss->incomplete_lock); 1700 1701 ieee80211_ibss_finish_sta(sta); 1702 rcu_read_unlock(); 1703 spin_lock_bh(&ifibss->incomplete_lock); 1704 } 1705 spin_unlock_bh(&ifibss->incomplete_lock); 1706 1707 switch (ifibss->state) { 1708 case IEEE80211_IBSS_MLME_SEARCH: 1709 ieee80211_sta_find_ibss(sdata); 1710 break; 1711 case IEEE80211_IBSS_MLME_JOINED: 1712 ieee80211_sta_merge_ibss(sdata); 1713 break; 1714 default: 1715 WARN_ON(1); 1716 break; 1717 } 1718 1719 out: 1720 sdata_unlock(sdata); 1721 } 1722 1723 static void ieee80211_ibss_timer(struct timer_list *t) 1724 { 1725 struct ieee80211_sub_if_data *sdata = 1726 from_timer(sdata, t, u.ibss.timer); 1727 1728 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1729 } 1730 1731 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1732 { 1733 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1734 1735 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1736 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1737 spin_lock_init(&ifibss->incomplete_lock); 1738 wiphy_work_init(&ifibss->csa_connection_drop_work, 1739 ieee80211_csa_connection_drop_work); 1740 } 1741 1742 /* scan finished notification */ 1743 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1744 { 1745 struct ieee80211_sub_if_data *sdata; 1746 1747 mutex_lock(&local->iflist_mtx); 1748 list_for_each_entry(sdata, &local->interfaces, list) { 1749 if (!ieee80211_sdata_running(sdata)) 1750 continue; 1751 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1752 continue; 1753 sdata->u.ibss.last_scan_completed = jiffies; 1754 } 1755 mutex_unlock(&local->iflist_mtx); 1756 } 1757 1758 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1759 struct cfg80211_ibss_params *params) 1760 { 1761 u64 changed = 0; 1762 u32 rate_flags; 1763 struct ieee80211_supported_band *sband; 1764 enum ieee80211_chanctx_mode chanmode; 1765 struct ieee80211_local *local = sdata->local; 1766 int radar_detect_width = 0; 1767 int i; 1768 int ret; 1769 1770 if (params->chandef.chan->freq_offset) { 1771 /* this may work, but is untested */ 1772 return -EOPNOTSUPP; 1773 } 1774 1775 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1776 ¶ms->chandef, 1777 sdata->wdev.iftype); 1778 if (ret < 0) 1779 return ret; 1780 1781 if (ret > 0) { 1782 if (!params->userspace_handles_dfs) 1783 return -EINVAL; 1784 radar_detect_width = BIT(params->chandef.width); 1785 } 1786 1787 chanmode = (params->channel_fixed && !ret) ? 1788 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1789 1790 mutex_lock(&local->chanctx_mtx); 1791 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1792 radar_detect_width); 1793 mutex_unlock(&local->chanctx_mtx); 1794 if (ret < 0) 1795 return ret; 1796 1797 if (params->bssid) { 1798 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1799 sdata->u.ibss.fixed_bssid = true; 1800 } else 1801 sdata->u.ibss.fixed_bssid = false; 1802 1803 sdata->u.ibss.privacy = params->privacy; 1804 sdata->u.ibss.control_port = params->control_port; 1805 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1806 sdata->u.ibss.basic_rates = params->basic_rates; 1807 sdata->u.ibss.last_scan_completed = jiffies; 1808 1809 /* fix basic_rates if channel does not support these rates */ 1810 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1811 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1812 for (i = 0; i < sband->n_bitrates; i++) { 1813 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1814 sdata->u.ibss.basic_rates &= ~BIT(i); 1815 } 1816 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1817 sizeof(params->mcast_rate)); 1818 1819 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1820 1821 sdata->u.ibss.chandef = params->chandef; 1822 sdata->u.ibss.fixed_channel = params->channel_fixed; 1823 1824 if (params->ie) { 1825 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1826 GFP_KERNEL); 1827 if (sdata->u.ibss.ie) 1828 sdata->u.ibss.ie_len = params->ie_len; 1829 } 1830 1831 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1832 sdata->u.ibss.ibss_join_req = jiffies; 1833 1834 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1835 sdata->u.ibss.ssid_len = params->ssid_len; 1836 1837 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1838 sizeof(sdata->u.ibss.ht_capa)); 1839 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1840 sizeof(sdata->u.ibss.ht_capa_mask)); 1841 1842 /* 1843 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1844 * reserved, but an HT STA shall protect HT transmissions as though 1845 * the HT Protection field were set to non-HT mixed mode. 1846 * 1847 * In an IBSS, the RIFS Mode field of the HT Operation element is 1848 * also reserved, but an HT STA shall operate as though this field 1849 * were set to 1. 1850 */ 1851 1852 sdata->vif.bss_conf.ht_operation_mode |= 1853 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1854 | IEEE80211_HT_PARAM_RIFS_MODE; 1855 1856 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1857 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1858 1859 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1860 sdata->deflink.needed_rx_chains = local->rx_chains; 1861 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1862 1863 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1864 1865 return 0; 1866 } 1867 1868 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1869 { 1870 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1871 1872 ieee80211_ibss_disconnect(sdata); 1873 ifibss->ssid_len = 0; 1874 eth_zero_addr(ifibss->bssid); 1875 1876 /* remove beacon */ 1877 kfree(sdata->u.ibss.ie); 1878 sdata->u.ibss.ie = NULL; 1879 sdata->u.ibss.ie_len = 0; 1880 1881 /* on the next join, re-program HT parameters */ 1882 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1883 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1884 1885 synchronize_rcu(); 1886 1887 skb_queue_purge(&sdata->skb_queue); 1888 1889 del_timer_sync(&sdata->u.ibss.timer); 1890 1891 return 0; 1892 } 1893