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) 2018-2022 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rate_flags, rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->cntdwn_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224 { 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.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 { 483 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 484 struct beacon_data *presp, *old_presp; 485 struct cfg80211_bss *cbss; 486 const struct cfg80211_bss_ies *ies; 487 u16 capability = WLAN_CAPABILITY_IBSS; 488 u64 tsf; 489 490 sdata_assert_lock(sdata); 491 492 if (ifibss->privacy) 493 capability |= WLAN_CAPABILITY_PRIVACY; 494 495 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 496 ifibss->bssid, ifibss->ssid, 497 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 498 IEEE80211_PRIVACY(ifibss->privacy)); 499 500 if (WARN_ON(!cbss)) 501 return -EINVAL; 502 503 rcu_read_lock(); 504 ies = rcu_dereference(cbss->ies); 505 tsf = ies->tsf; 506 rcu_read_unlock(); 507 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 508 509 old_presp = sdata_dereference(ifibss->presp, sdata); 510 511 presp = ieee80211_ibss_build_presp(sdata, 512 sdata->vif.bss_conf.beacon_int, 513 sdata->vif.bss_conf.basic_rates, 514 capability, tsf, &ifibss->chandef, 515 NULL, csa_settings); 516 if (!presp) 517 return -ENOMEM; 518 519 rcu_assign_pointer(ifibss->presp, presp); 520 if (old_presp) 521 kfree_rcu(old_presp, rcu_head); 522 523 return BSS_CHANGED_BEACON; 524 } 525 526 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 527 { 528 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 529 struct cfg80211_bss *cbss; 530 531 sdata_assert_lock(sdata); 532 533 /* When not connected/joined, sending CSA doesn't make sense. */ 534 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 535 return -ENOLINK; 536 537 /* update cfg80211 bss information with the new channel */ 538 if (!is_zero_ether_addr(ifibss->bssid)) { 539 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 540 ifibss->chandef.chan, 541 ifibss->bssid, ifibss->ssid, 542 ifibss->ssid_len, 543 IEEE80211_BSS_TYPE_IBSS, 544 IEEE80211_PRIVACY(ifibss->privacy)); 545 /* XXX: should not really modify cfg80211 data */ 546 if (cbss) { 547 cbss->channel = sdata->deflink.csa_chandef.chan; 548 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 549 } 550 } 551 552 ifibss->chandef = sdata->deflink.csa_chandef; 553 554 /* generate the beacon */ 555 return ieee80211_ibss_csa_beacon(sdata, NULL); 556 } 557 558 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 559 { 560 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 561 562 cancel_work_sync(&ifibss->csa_connection_drop_work); 563 } 564 565 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 566 __acquires(RCU) 567 { 568 struct ieee80211_sub_if_data *sdata = sta->sdata; 569 u8 addr[ETH_ALEN]; 570 571 memcpy(addr, sta->sta.addr, ETH_ALEN); 572 573 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 574 575 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 576 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 577 /* authorize the station only if the network is not RSN protected. If 578 * not wait for the userspace to authorize it */ 579 if (!sta->sdata->u.ibss.control_port) 580 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 581 582 rate_control_rate_init(sta); 583 584 /* If it fails, maybe we raced another insertion? */ 585 if (sta_info_insert_rcu(sta)) 586 return sta_info_get(sdata, addr); 587 return sta; 588 } 589 590 static struct sta_info * 591 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 592 const u8 *addr, u32 supp_rates) 593 __acquires(RCU) 594 { 595 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 596 struct ieee80211_local *local = sdata->local; 597 struct sta_info *sta; 598 struct ieee80211_chanctx_conf *chanctx_conf; 599 struct ieee80211_supported_band *sband; 600 enum nl80211_bss_scan_width scan_width; 601 int band; 602 603 /* 604 * XXX: Consider removing the least recently used entry and 605 * allow new one to be added. 606 */ 607 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 608 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 609 sdata->name, addr); 610 rcu_read_lock(); 611 return NULL; 612 } 613 614 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 615 rcu_read_lock(); 616 return NULL; 617 } 618 619 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 620 rcu_read_lock(); 621 return NULL; 622 } 623 624 rcu_read_lock(); 625 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 626 if (WARN_ON_ONCE(!chanctx_conf)) 627 return NULL; 628 band = chanctx_conf->def.chan->band; 629 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 630 rcu_read_unlock(); 631 632 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 633 if (!sta) { 634 rcu_read_lock(); 635 return NULL; 636 } 637 638 /* make sure mandatory rates are always added */ 639 sband = local->hw.wiphy->bands[band]; 640 sta->sta.deflink.supp_rates[band] = supp_rates | 641 ieee80211_mandatory_rates(sband, scan_width); 642 643 return ieee80211_ibss_finish_sta(sta); 644 } 645 646 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 647 { 648 struct ieee80211_local *local = sdata->local; 649 int active = 0; 650 struct sta_info *sta; 651 652 sdata_assert_lock(sdata); 653 654 rcu_read_lock(); 655 656 list_for_each_entry_rcu(sta, &local->sta_list, list) { 657 unsigned long last_active = ieee80211_sta_last_active(sta); 658 659 if (sta->sdata == sdata && 660 time_is_after_jiffies(last_active + 661 IEEE80211_IBSS_MERGE_INTERVAL)) { 662 active++; 663 break; 664 } 665 } 666 667 rcu_read_unlock(); 668 669 return active; 670 } 671 672 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 673 { 674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 675 struct ieee80211_local *local = sdata->local; 676 struct cfg80211_bss *cbss; 677 struct beacon_data *presp; 678 struct sta_info *sta; 679 680 if (!is_zero_ether_addr(ifibss->bssid)) { 681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 682 ifibss->bssid, ifibss->ssid, 683 ifibss->ssid_len, 684 IEEE80211_BSS_TYPE_IBSS, 685 IEEE80211_PRIVACY(ifibss->privacy)); 686 687 if (cbss) { 688 cfg80211_unlink_bss(local->hw.wiphy, cbss); 689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 690 } 691 } 692 693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 694 695 sta_info_flush(sdata); 696 697 spin_lock_bh(&ifibss->incomplete_lock); 698 while (!list_empty(&ifibss->incomplete_stations)) { 699 sta = list_first_entry(&ifibss->incomplete_stations, 700 struct sta_info, list); 701 list_del(&sta->list); 702 spin_unlock_bh(&ifibss->incomplete_lock); 703 704 sta_info_free(local, sta); 705 spin_lock_bh(&ifibss->incomplete_lock); 706 } 707 spin_unlock_bh(&ifibss->incomplete_lock); 708 709 netif_carrier_off(sdata->dev); 710 711 sdata->vif.cfg.ibss_joined = false; 712 sdata->vif.cfg.ibss_creator = false; 713 sdata->vif.bss_conf.enable_beacon = false; 714 sdata->vif.cfg.ssid_len = 0; 715 716 /* remove beacon */ 717 presp = sdata_dereference(ifibss->presp, sdata); 718 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 719 if (presp) 720 kfree_rcu(presp, rcu_head); 721 722 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 723 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 724 BSS_CHANGED_IBSS); 725 drv_leave_ibss(local, sdata); 726 mutex_lock(&local->mtx); 727 ieee80211_link_release_channel(&sdata->deflink); 728 mutex_unlock(&local->mtx); 729 } 730 731 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 732 { 733 struct ieee80211_sub_if_data *sdata = 734 container_of(work, struct ieee80211_sub_if_data, 735 u.ibss.csa_connection_drop_work); 736 737 sdata_lock(sdata); 738 739 ieee80211_ibss_disconnect(sdata); 740 synchronize_rcu(); 741 skb_queue_purge(&sdata->skb_queue); 742 743 /* trigger a scan to find another IBSS network to join */ 744 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 745 746 sdata_unlock(sdata); 747 } 748 749 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 750 { 751 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 752 int err; 753 754 /* if the current channel is a DFS channel, mark the channel as 755 * unavailable. 756 */ 757 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 758 &ifibss->chandef, 759 NL80211_IFTYPE_ADHOC); 760 if (err > 0) 761 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 762 GFP_ATOMIC); 763 } 764 765 static bool 766 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 767 struct ieee802_11_elems *elems, 768 bool beacon) 769 { 770 struct cfg80211_csa_settings params; 771 struct ieee80211_csa_ie csa_ie; 772 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 773 enum nl80211_channel_type ch_type; 774 int err; 775 ieee80211_conn_flags_t conn_flags; 776 u32 vht_cap_info = 0; 777 778 sdata_assert_lock(sdata); 779 780 conn_flags = IEEE80211_CONN_DISABLE_VHT; 781 782 switch (ifibss->chandef.width) { 783 case NL80211_CHAN_WIDTH_5: 784 case NL80211_CHAN_WIDTH_10: 785 case NL80211_CHAN_WIDTH_20_NOHT: 786 conn_flags |= IEEE80211_CONN_DISABLE_HT; 787 fallthrough; 788 case NL80211_CHAN_WIDTH_20: 789 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ; 790 break; 791 default: 792 break; 793 } 794 795 if (elems->vht_cap_elem) 796 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 797 798 memset(¶ms, 0, sizeof(params)); 799 err = ieee80211_parse_ch_switch_ie(sdata, elems, 800 ifibss->chandef.chan->band, 801 vht_cap_info, 802 conn_flags, ifibss->bssid, &csa_ie); 803 /* can't switch to destination channel, fail */ 804 if (err < 0) 805 goto disconnect; 806 807 /* did not contain a CSA */ 808 if (err) 809 return false; 810 811 /* channel switch is not supported, disconnect */ 812 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 813 goto disconnect; 814 815 params.count = csa_ie.count; 816 params.chandef = csa_ie.chandef; 817 818 switch (ifibss->chandef.width) { 819 case NL80211_CHAN_WIDTH_20_NOHT: 820 case NL80211_CHAN_WIDTH_20: 821 case NL80211_CHAN_WIDTH_40: 822 /* keep our current HT mode (HT20/HT40+/HT40-), even if 823 * another mode has been announced. The mode is not adopted 824 * within the beacon while doing CSA and we should therefore 825 * keep the mode which we announce. 826 */ 827 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 828 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 829 ch_type); 830 break; 831 case NL80211_CHAN_WIDTH_5: 832 case NL80211_CHAN_WIDTH_10: 833 if (params.chandef.width != ifibss->chandef.width) { 834 sdata_info(sdata, 835 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 836 ifibss->bssid, 837 params.chandef.chan->center_freq, 838 params.chandef.width, 839 params.chandef.center_freq1, 840 params.chandef.center_freq2); 841 goto disconnect; 842 } 843 break; 844 default: 845 /* should not happen, conn_flags should prevent VHT modes. */ 846 WARN_ON(1); 847 goto disconnect; 848 } 849 850 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 851 NL80211_IFTYPE_ADHOC)) { 852 sdata_info(sdata, 853 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 854 ifibss->bssid, 855 params.chandef.chan->center_freq, 856 params.chandef.width, 857 params.chandef.center_freq1, 858 params.chandef.center_freq2); 859 goto disconnect; 860 } 861 862 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 863 ¶ms.chandef, 864 NL80211_IFTYPE_ADHOC); 865 if (err < 0) 866 goto disconnect; 867 if (err > 0 && !ifibss->userspace_handles_dfs) { 868 /* IBSS-DFS only allowed with a control program */ 869 goto disconnect; 870 } 871 872 params.radar_required = err; 873 874 if (cfg80211_chandef_identical(¶ms.chandef, 875 &sdata->vif.bss_conf.chandef)) { 876 ibss_dbg(sdata, 877 "received csa with an identical chandef, ignoring\n"); 878 return true; 879 } 880 881 /* all checks done, now perform the channel switch. */ 882 ibss_dbg(sdata, 883 "received channel switch announcement to go to channel %d MHz\n", 884 params.chandef.chan->center_freq); 885 886 params.block_tx = !!csa_ie.mode; 887 888 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 889 ¶ms)) 890 goto disconnect; 891 892 ieee80211_ibss_csa_mark_radar(sdata); 893 894 return true; 895 disconnect: 896 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 897 ieee80211_queue_work(&sdata->local->hw, 898 &ifibss->csa_connection_drop_work); 899 900 ieee80211_ibss_csa_mark_radar(sdata); 901 902 return true; 903 } 904 905 static void 906 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 907 struct ieee80211_mgmt *mgmt, size_t len, 908 struct ieee80211_rx_status *rx_status, 909 struct ieee802_11_elems *elems) 910 { 911 int required_len; 912 913 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 914 return; 915 916 /* CSA is the only action we handle for now */ 917 if (mgmt->u.action.u.measurement.action_code != 918 WLAN_ACTION_SPCT_CHL_SWITCH) 919 return; 920 921 required_len = IEEE80211_MIN_ACTION_SIZE + 922 sizeof(mgmt->u.action.u.chan_switch); 923 if (len < required_len) 924 return; 925 926 if (!sdata->vif.bss_conf.csa_active) 927 ieee80211_ibss_process_chanswitch(sdata, elems, false); 928 } 929 930 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 931 struct ieee80211_mgmt *mgmt, 932 size_t len) 933 { 934 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 935 936 if (len < IEEE80211_DEAUTH_FRAME_LEN) 937 return; 938 939 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 940 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 941 sta_info_destroy_addr(sdata, mgmt->sa); 942 } 943 944 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 945 struct ieee80211_mgmt *mgmt, 946 size_t len) 947 { 948 u16 auth_alg, auth_transaction; 949 950 sdata_assert_lock(sdata); 951 952 if (len < 24 + 6) 953 return; 954 955 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 956 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 957 958 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 959 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 960 mgmt->bssid, auth_transaction); 961 962 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 963 return; 964 965 /* 966 * IEEE 802.11 standard does not require authentication in IBSS 967 * networks and most implementations do not seem to use it. 968 * However, try to reply to authentication attempts if someone 969 * has actually implemented this. 970 */ 971 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 972 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 973 } 974 975 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 976 struct ieee80211_mgmt *mgmt, size_t len, 977 struct ieee80211_rx_status *rx_status, 978 struct ieee802_11_elems *elems, 979 struct ieee80211_channel *channel) 980 { 981 struct sta_info *sta; 982 enum nl80211_band band = rx_status->band; 983 enum nl80211_bss_scan_width scan_width; 984 struct ieee80211_local *local = sdata->local; 985 struct ieee80211_supported_band *sband; 986 bool rates_updated = false; 987 u32 supp_rates = 0; 988 989 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 990 return; 991 992 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 993 return; 994 995 sband = local->hw.wiphy->bands[band]; 996 if (WARN_ON(!sband)) 997 return; 998 999 rcu_read_lock(); 1000 sta = sta_info_get(sdata, mgmt->sa); 1001 1002 if (elems->supp_rates) { 1003 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1004 band, NULL); 1005 if (sta) { 1006 u32 prev_rates; 1007 1008 prev_rates = sta->sta.deflink.supp_rates[band]; 1009 /* make sure mandatory rates are always added */ 1010 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1011 if (rx_status->bw == RATE_INFO_BW_5) 1012 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1013 else if (rx_status->bw == RATE_INFO_BW_10) 1014 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1015 1016 sta->sta.deflink.supp_rates[band] = supp_rates | 1017 ieee80211_mandatory_rates(sband, scan_width); 1018 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 1019 ibss_dbg(sdata, 1020 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1021 sta->sta.addr, prev_rates, 1022 sta->sta.deflink.supp_rates[band]); 1023 rates_updated = true; 1024 } 1025 } else { 1026 rcu_read_unlock(); 1027 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1028 mgmt->sa, supp_rates); 1029 } 1030 } 1031 1032 if (sta && !sta->sta.wme && 1033 (elems->wmm_info || elems->s1g_capab) && 1034 local->hw.queues >= IEEE80211_NUM_ACS) { 1035 sta->sta.wme = true; 1036 ieee80211_check_fast_xmit(sta); 1037 } 1038 1039 if (sta && elems->ht_operation && elems->ht_cap_elem && 1040 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1043 /* we both use HT */ 1044 struct ieee80211_ht_cap htcap_ie; 1045 struct cfg80211_chan_def chandef; 1046 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1047 1048 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1049 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1050 1051 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1052 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1053 &htcap_ie, 1054 &sta->deflink); 1055 1056 if (elems->vht_operation && elems->vht_cap_elem && 1057 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1059 /* we both use VHT */ 1060 struct ieee80211_vht_cap cap_ie; 1061 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1062 u32 vht_cap_info = 1063 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1064 1065 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1066 elems->vht_operation, 1067 elems->ht_operation, 1068 &chandef); 1069 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1070 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1071 &cap_ie, 1072 &sta->deflink); 1073 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1074 rates_updated |= true; 1075 } 1076 1077 if (bw != sta->sta.deflink.bandwidth) 1078 rates_updated |= true; 1079 1080 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1081 &chandef)) 1082 WARN_ON_ONCE(1); 1083 } 1084 1085 if (sta && rates_updated) { 1086 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1087 u8 rx_nss = sta->sta.deflink.rx_nss; 1088 1089 /* Force rx_nss recalculation */ 1090 sta->sta.deflink.rx_nss = 0; 1091 rate_control_rate_init(sta); 1092 if (sta->sta.deflink.rx_nss != rx_nss) 1093 changed |= IEEE80211_RC_NSS_CHANGED; 1094 1095 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1096 } 1097 1098 rcu_read_unlock(); 1099 } 1100 1101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1102 struct ieee80211_mgmt *mgmt, size_t len, 1103 struct ieee80211_rx_status *rx_status, 1104 struct ieee802_11_elems *elems) 1105 { 1106 struct ieee80211_local *local = sdata->local; 1107 struct cfg80211_bss *cbss; 1108 struct ieee80211_bss *bss; 1109 struct ieee80211_channel *channel; 1110 u64 beacon_timestamp, rx_timestamp; 1111 u32 supp_rates = 0; 1112 enum nl80211_band band = rx_status->band; 1113 1114 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1115 if (!channel) 1116 return; 1117 1118 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1119 1120 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1121 if (!bss) 1122 return; 1123 1124 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1125 1126 /* same for beacon and probe response */ 1127 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1128 1129 /* check if we need to merge IBSS */ 1130 1131 /* not an IBSS */ 1132 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1133 goto put_bss; 1134 1135 /* different channel */ 1136 if (sdata->u.ibss.fixed_channel && 1137 sdata->u.ibss.chandef.chan != cbss->channel) 1138 goto put_bss; 1139 1140 /* different SSID */ 1141 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1142 memcmp(elems->ssid, sdata->u.ibss.ssid, 1143 sdata->u.ibss.ssid_len)) 1144 goto put_bss; 1145 1146 /* process channel switch */ 1147 if (sdata->vif.bss_conf.csa_active || 1148 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1149 goto put_bss; 1150 1151 /* same BSSID */ 1152 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1153 goto put_bss; 1154 1155 /* we use a fixed BSSID */ 1156 if (sdata->u.ibss.fixed_bssid) 1157 goto put_bss; 1158 1159 if (ieee80211_have_rx_timestamp(rx_status)) { 1160 /* time when timestamp field was received */ 1161 rx_timestamp = 1162 ieee80211_calculate_rx_timestamp(local, rx_status, 1163 len + FCS_LEN, 24); 1164 } else { 1165 /* 1166 * second best option: get current TSF 1167 * (will return -1 if not supported) 1168 */ 1169 rx_timestamp = drv_get_tsf(local, sdata); 1170 } 1171 1172 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1173 mgmt->sa, mgmt->bssid, 1174 (unsigned long long)rx_timestamp); 1175 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1176 (unsigned long long)beacon_timestamp, 1177 (unsigned long long)(rx_timestamp - beacon_timestamp), 1178 jiffies); 1179 1180 if (beacon_timestamp > rx_timestamp) { 1181 ibss_dbg(sdata, 1182 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1183 mgmt->bssid); 1184 ieee80211_sta_join_ibss(sdata, bss); 1185 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1186 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1187 supp_rates); 1188 rcu_read_unlock(); 1189 } 1190 1191 put_bss: 1192 ieee80211_rx_bss_put(local, bss); 1193 } 1194 1195 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1196 const u8 *bssid, const u8 *addr, 1197 u32 supp_rates) 1198 { 1199 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1200 struct ieee80211_local *local = sdata->local; 1201 struct sta_info *sta; 1202 struct ieee80211_chanctx_conf *chanctx_conf; 1203 struct ieee80211_supported_band *sband; 1204 enum nl80211_bss_scan_width scan_width; 1205 int band; 1206 1207 /* 1208 * XXX: Consider removing the least recently used entry and 1209 * allow new one to be added. 1210 */ 1211 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1212 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1213 sdata->name, addr); 1214 return; 1215 } 1216 1217 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1218 return; 1219 1220 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1221 return; 1222 1223 rcu_read_lock(); 1224 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1225 if (WARN_ON_ONCE(!chanctx_conf)) { 1226 rcu_read_unlock(); 1227 return; 1228 } 1229 band = chanctx_conf->def.chan->band; 1230 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1231 rcu_read_unlock(); 1232 1233 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1234 if (!sta) 1235 return; 1236 1237 /* make sure mandatory rates are always added */ 1238 sband = local->hw.wiphy->bands[band]; 1239 sta->sta.deflink.supp_rates[band] = supp_rates | 1240 ieee80211_mandatory_rates(sband, scan_width); 1241 1242 spin_lock(&ifibss->incomplete_lock); 1243 list_add(&sta->list, &ifibss->incomplete_stations); 1244 spin_unlock(&ifibss->incomplete_lock); 1245 ieee80211_queue_work(&local->hw, &sdata->work); 1246 } 1247 1248 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1249 { 1250 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1251 struct ieee80211_local *local = sdata->local; 1252 struct sta_info *sta, *tmp; 1253 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1254 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1255 1256 mutex_lock(&local->sta_mtx); 1257 1258 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1259 unsigned long last_active = ieee80211_sta_last_active(sta); 1260 1261 if (sdata != sta->sdata) 1262 continue; 1263 1264 if (time_is_before_jiffies(last_active + exp_time) || 1265 (time_is_before_jiffies(last_active + exp_rsn) && 1266 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1267 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1268 1269 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1270 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1271 "not authorized " : "", sta->sta.addr); 1272 1273 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1274 ifibss->bssid, 1275 IEEE80211_STYPE_DEAUTH, 1276 WLAN_REASON_DEAUTH_LEAVING, 1277 true, frame_buf); 1278 WARN_ON(__sta_info_destroy(sta)); 1279 } 1280 } 1281 1282 mutex_unlock(&local->sta_mtx); 1283 } 1284 1285 /* 1286 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1287 */ 1288 1289 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1290 { 1291 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1292 enum nl80211_bss_scan_width scan_width; 1293 1294 sdata_assert_lock(sdata); 1295 1296 mod_timer(&ifibss->timer, 1297 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1298 1299 ieee80211_ibss_sta_expire(sdata); 1300 1301 if (time_before(jiffies, ifibss->last_scan_completed + 1302 IEEE80211_IBSS_MERGE_INTERVAL)) 1303 return; 1304 1305 if (ieee80211_sta_active_ibss(sdata)) 1306 return; 1307 1308 if (ifibss->fixed_channel) 1309 return; 1310 1311 sdata_info(sdata, 1312 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1313 1314 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1315 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1316 NULL, 0, scan_width); 1317 } 1318 1319 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1320 { 1321 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1322 u8 bssid[ETH_ALEN]; 1323 u16 capability; 1324 int i; 1325 1326 sdata_assert_lock(sdata); 1327 1328 if (ifibss->fixed_bssid) { 1329 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1330 } else { 1331 /* Generate random, not broadcast, locally administered BSSID. Mix in 1332 * own MAC address to make sure that devices that do not have proper 1333 * random number generator get different BSSID. */ 1334 get_random_bytes(bssid, ETH_ALEN); 1335 for (i = 0; i < ETH_ALEN; i++) 1336 bssid[i] ^= sdata->vif.addr[i]; 1337 bssid[0] &= ~0x01; 1338 bssid[0] |= 0x02; 1339 } 1340 1341 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1342 1343 capability = WLAN_CAPABILITY_IBSS; 1344 1345 if (ifibss->privacy) 1346 capability |= WLAN_CAPABILITY_PRIVACY; 1347 1348 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1349 &ifibss->chandef, ifibss->basic_rates, 1350 capability, 0, true); 1351 } 1352 1353 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1354 struct ieee80211_channel **channels, 1355 unsigned int channels_max, 1356 u32 center_freq, u32 width) 1357 { 1358 struct ieee80211_channel *chan = NULL; 1359 unsigned int n_chan = 0; 1360 u32 start_freq, end_freq, freq; 1361 1362 if (width <= 20) { 1363 start_freq = center_freq; 1364 end_freq = center_freq; 1365 } else { 1366 start_freq = center_freq - width / 2 + 10; 1367 end_freq = center_freq + width / 2 - 10; 1368 } 1369 1370 for (freq = start_freq; freq <= end_freq; freq += 20) { 1371 chan = ieee80211_get_channel(wiphy, freq); 1372 if (!chan) 1373 continue; 1374 if (n_chan >= channels_max) 1375 return n_chan; 1376 1377 channels[n_chan] = chan; 1378 n_chan++; 1379 } 1380 1381 return n_chan; 1382 } 1383 1384 static unsigned int 1385 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1386 const struct cfg80211_chan_def *chandef, 1387 struct ieee80211_channel **channels, 1388 unsigned int channels_max) 1389 { 1390 unsigned int n_chan = 0; 1391 u32 width, cf1, cf2 = 0; 1392 1393 switch (chandef->width) { 1394 case NL80211_CHAN_WIDTH_40: 1395 width = 40; 1396 break; 1397 case NL80211_CHAN_WIDTH_80P80: 1398 cf2 = chandef->center_freq2; 1399 fallthrough; 1400 case NL80211_CHAN_WIDTH_80: 1401 width = 80; 1402 break; 1403 case NL80211_CHAN_WIDTH_160: 1404 width = 160; 1405 break; 1406 default: 1407 width = 20; 1408 break; 1409 } 1410 1411 cf1 = chandef->center_freq1; 1412 1413 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1414 1415 if (cf2) 1416 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1417 channels_max - n_chan, cf2, 1418 width); 1419 1420 return n_chan; 1421 } 1422 1423 /* 1424 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1425 */ 1426 1427 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1428 { 1429 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1430 struct ieee80211_local *local = sdata->local; 1431 struct cfg80211_bss *cbss; 1432 struct ieee80211_channel *chan = NULL; 1433 const u8 *bssid = NULL; 1434 enum nl80211_bss_scan_width scan_width; 1435 int active_ibss; 1436 1437 sdata_assert_lock(sdata); 1438 1439 active_ibss = ieee80211_sta_active_ibss(sdata); 1440 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1441 1442 if (active_ibss) 1443 return; 1444 1445 if (ifibss->fixed_bssid) 1446 bssid = ifibss->bssid; 1447 if (ifibss->fixed_channel) 1448 chan = ifibss->chandef.chan; 1449 if (!is_zero_ether_addr(ifibss->bssid)) 1450 bssid = ifibss->bssid; 1451 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1452 ifibss->ssid, ifibss->ssid_len, 1453 IEEE80211_BSS_TYPE_IBSS, 1454 IEEE80211_PRIVACY(ifibss->privacy)); 1455 1456 if (cbss) { 1457 struct ieee80211_bss *bss; 1458 1459 bss = (void *)cbss->priv; 1460 ibss_dbg(sdata, 1461 "sta_find_ibss: selected %pM current %pM\n", 1462 cbss->bssid, ifibss->bssid); 1463 sdata_info(sdata, 1464 "Selected IBSS BSSID %pM based on configured SSID\n", 1465 cbss->bssid); 1466 1467 ieee80211_sta_join_ibss(sdata, bss); 1468 ieee80211_rx_bss_put(local, bss); 1469 return; 1470 } 1471 1472 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1473 * directly and do not waste time scanning 1474 */ 1475 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1476 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1477 bssid); 1478 ieee80211_sta_create_ibss(sdata); 1479 return; 1480 } 1481 1482 1483 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1484 1485 /* Selected IBSS not found in current scan results - try to scan */ 1486 if (time_after(jiffies, ifibss->last_scan_completed + 1487 IEEE80211_SCAN_INTERVAL)) { 1488 struct ieee80211_channel *channels[8]; 1489 unsigned int num; 1490 1491 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1492 1493 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1494 1495 if (ifibss->fixed_channel) { 1496 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1497 &ifibss->chandef, 1498 channels, 1499 ARRAY_SIZE(channels)); 1500 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1501 ifibss->ssid_len, channels, 1502 num, scan_width); 1503 } else { 1504 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1505 ifibss->ssid_len, NULL, 1506 0, scan_width); 1507 } 1508 } else { 1509 int interval = IEEE80211_SCAN_INTERVAL; 1510 1511 if (time_after(jiffies, ifibss->ibss_join_req + 1512 IEEE80211_IBSS_JOIN_TIMEOUT)) 1513 ieee80211_sta_create_ibss(sdata); 1514 1515 mod_timer(&ifibss->timer, 1516 round_jiffies(jiffies + interval)); 1517 } 1518 } 1519 1520 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1521 struct sk_buff *req) 1522 { 1523 struct ieee80211_mgmt *mgmt = (void *)req->data; 1524 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1525 struct ieee80211_local *local = sdata->local; 1526 int tx_last_beacon, len = req->len; 1527 struct sk_buff *skb; 1528 struct beacon_data *presp; 1529 u8 *pos, *end; 1530 1531 sdata_assert_lock(sdata); 1532 1533 presp = sdata_dereference(ifibss->presp, sdata); 1534 1535 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1536 len < 24 + 2 || !presp) 1537 return; 1538 1539 tx_last_beacon = drv_tx_last_beacon(local); 1540 1541 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1542 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1543 mgmt->bssid, tx_last_beacon); 1544 1545 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1546 return; 1547 1548 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1549 !is_broadcast_ether_addr(mgmt->bssid)) 1550 return; 1551 1552 end = ((u8 *) mgmt) + len; 1553 pos = mgmt->u.probe_req.variable; 1554 if (pos[0] != WLAN_EID_SSID || 1555 pos + 2 + pos[1] > end) { 1556 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1557 mgmt->sa); 1558 return; 1559 } 1560 if (pos[1] != 0 && 1561 (pos[1] != ifibss->ssid_len || 1562 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1563 /* Ignore ProbeReq for foreign SSID */ 1564 return; 1565 } 1566 1567 /* Reply with ProbeResp */ 1568 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1569 if (!skb) 1570 return; 1571 1572 skb_reserve(skb, local->tx_headroom); 1573 skb_put_data(skb, presp->head, presp->head_len); 1574 1575 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1576 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1577 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1578 1579 /* avoid excessive retries for probe request to wildcard SSIDs */ 1580 if (pos[1] == 0) 1581 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1582 1583 ieee80211_tx_skb(sdata, skb); 1584 } 1585 1586 static 1587 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1588 struct ieee80211_mgmt *mgmt, size_t len, 1589 struct ieee80211_rx_status *rx_status) 1590 { 1591 size_t baselen; 1592 struct ieee802_11_elems *elems; 1593 1594 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1595 offsetof(typeof(mgmt->u.beacon), variable)); 1596 1597 /* 1598 * either beacon or probe_resp but the variable field is at the 1599 * same offset 1600 */ 1601 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1602 if (baselen > len) 1603 return; 1604 1605 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1606 len - baselen, false, NULL); 1607 1608 if (elems) { 1609 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1610 kfree(elems); 1611 } 1612 } 1613 1614 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1615 struct sk_buff *skb) 1616 { 1617 struct ieee80211_rx_status *rx_status; 1618 struct ieee80211_mgmt *mgmt; 1619 u16 fc; 1620 struct ieee802_11_elems *elems; 1621 int ies_len; 1622 1623 rx_status = IEEE80211_SKB_RXCB(skb); 1624 mgmt = (struct ieee80211_mgmt *) skb->data; 1625 fc = le16_to_cpu(mgmt->frame_control); 1626 1627 sdata_lock(sdata); 1628 1629 if (!sdata->u.ibss.ssid_len) 1630 goto mgmt_out; /* not ready to merge yet */ 1631 1632 switch (fc & IEEE80211_FCTL_STYPE) { 1633 case IEEE80211_STYPE_PROBE_REQ: 1634 ieee80211_rx_mgmt_probe_req(sdata, skb); 1635 break; 1636 case IEEE80211_STYPE_PROBE_RESP: 1637 case IEEE80211_STYPE_BEACON: 1638 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1639 rx_status); 1640 break; 1641 case IEEE80211_STYPE_AUTH: 1642 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1643 break; 1644 case IEEE80211_STYPE_DEAUTH: 1645 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1646 break; 1647 case IEEE80211_STYPE_ACTION: 1648 switch (mgmt->u.action.category) { 1649 case WLAN_CATEGORY_SPECTRUM_MGMT: 1650 ies_len = skb->len - 1651 offsetof(struct ieee80211_mgmt, 1652 u.action.u.chan_switch.variable); 1653 1654 if (ies_len < 0) 1655 break; 1656 1657 elems = ieee802_11_parse_elems( 1658 mgmt->u.action.u.chan_switch.variable, 1659 ies_len, true, NULL); 1660 1661 if (elems && !elems->parse_error) 1662 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1663 skb->len, 1664 rx_status, 1665 elems); 1666 kfree(elems); 1667 break; 1668 } 1669 } 1670 1671 mgmt_out: 1672 sdata_unlock(sdata); 1673 } 1674 1675 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1676 { 1677 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1678 struct sta_info *sta; 1679 1680 sdata_lock(sdata); 1681 1682 /* 1683 * Work could be scheduled after scan or similar 1684 * when we aren't even joined (or trying) with a 1685 * network. 1686 */ 1687 if (!ifibss->ssid_len) 1688 goto out; 1689 1690 spin_lock_bh(&ifibss->incomplete_lock); 1691 while (!list_empty(&ifibss->incomplete_stations)) { 1692 sta = list_first_entry(&ifibss->incomplete_stations, 1693 struct sta_info, list); 1694 list_del(&sta->list); 1695 spin_unlock_bh(&ifibss->incomplete_lock); 1696 1697 ieee80211_ibss_finish_sta(sta); 1698 rcu_read_unlock(); 1699 spin_lock_bh(&ifibss->incomplete_lock); 1700 } 1701 spin_unlock_bh(&ifibss->incomplete_lock); 1702 1703 switch (ifibss->state) { 1704 case IEEE80211_IBSS_MLME_SEARCH: 1705 ieee80211_sta_find_ibss(sdata); 1706 break; 1707 case IEEE80211_IBSS_MLME_JOINED: 1708 ieee80211_sta_merge_ibss(sdata); 1709 break; 1710 default: 1711 WARN_ON(1); 1712 break; 1713 } 1714 1715 out: 1716 sdata_unlock(sdata); 1717 } 1718 1719 static void ieee80211_ibss_timer(struct timer_list *t) 1720 { 1721 struct ieee80211_sub_if_data *sdata = 1722 from_timer(sdata, t, u.ibss.timer); 1723 1724 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1725 } 1726 1727 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1728 { 1729 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1730 1731 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1732 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1733 spin_lock_init(&ifibss->incomplete_lock); 1734 INIT_WORK(&ifibss->csa_connection_drop_work, 1735 ieee80211_csa_connection_drop_work); 1736 } 1737 1738 /* scan finished notification */ 1739 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1740 { 1741 struct ieee80211_sub_if_data *sdata; 1742 1743 mutex_lock(&local->iflist_mtx); 1744 list_for_each_entry(sdata, &local->interfaces, list) { 1745 if (!ieee80211_sdata_running(sdata)) 1746 continue; 1747 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1748 continue; 1749 sdata->u.ibss.last_scan_completed = jiffies; 1750 } 1751 mutex_unlock(&local->iflist_mtx); 1752 } 1753 1754 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1755 struct cfg80211_ibss_params *params) 1756 { 1757 u32 changed = 0; 1758 u32 rate_flags; 1759 struct ieee80211_supported_band *sband; 1760 enum ieee80211_chanctx_mode chanmode; 1761 struct ieee80211_local *local = sdata->local; 1762 int radar_detect_width = 0; 1763 int i; 1764 int ret; 1765 1766 if (params->chandef.chan->freq_offset) { 1767 /* this may work, but is untested */ 1768 return -EOPNOTSUPP; 1769 } 1770 1771 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1772 ¶ms->chandef, 1773 sdata->wdev.iftype); 1774 if (ret < 0) 1775 return ret; 1776 1777 if (ret > 0) { 1778 if (!params->userspace_handles_dfs) 1779 return -EINVAL; 1780 radar_detect_width = BIT(params->chandef.width); 1781 } 1782 1783 chanmode = (params->channel_fixed && !ret) ? 1784 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1785 1786 mutex_lock(&local->chanctx_mtx); 1787 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1788 radar_detect_width); 1789 mutex_unlock(&local->chanctx_mtx); 1790 if (ret < 0) 1791 return ret; 1792 1793 if (params->bssid) { 1794 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1795 sdata->u.ibss.fixed_bssid = true; 1796 } else 1797 sdata->u.ibss.fixed_bssid = false; 1798 1799 sdata->u.ibss.privacy = params->privacy; 1800 sdata->u.ibss.control_port = params->control_port; 1801 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1802 sdata->u.ibss.basic_rates = params->basic_rates; 1803 sdata->u.ibss.last_scan_completed = jiffies; 1804 1805 /* fix basic_rates if channel does not support these rates */ 1806 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1807 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1808 for (i = 0; i < sband->n_bitrates; i++) { 1809 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1810 sdata->u.ibss.basic_rates &= ~BIT(i); 1811 } 1812 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1813 sizeof(params->mcast_rate)); 1814 1815 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1816 1817 sdata->u.ibss.chandef = params->chandef; 1818 sdata->u.ibss.fixed_channel = params->channel_fixed; 1819 1820 if (params->ie) { 1821 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1822 GFP_KERNEL); 1823 if (sdata->u.ibss.ie) 1824 sdata->u.ibss.ie_len = params->ie_len; 1825 } 1826 1827 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1828 sdata->u.ibss.ibss_join_req = jiffies; 1829 1830 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1831 sdata->u.ibss.ssid_len = params->ssid_len; 1832 1833 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1834 sizeof(sdata->u.ibss.ht_capa)); 1835 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1836 sizeof(sdata->u.ibss.ht_capa_mask)); 1837 1838 /* 1839 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1840 * reserved, but an HT STA shall protect HT transmissions as though 1841 * the HT Protection field were set to non-HT mixed mode. 1842 * 1843 * In an IBSS, the RIFS Mode field of the HT Operation element is 1844 * also reserved, but an HT STA shall operate as though this field 1845 * were set to 1. 1846 */ 1847 1848 sdata->vif.bss_conf.ht_operation_mode |= 1849 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1850 | IEEE80211_HT_PARAM_RIFS_MODE; 1851 1852 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1853 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1854 1855 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1856 sdata->deflink.needed_rx_chains = local->rx_chains; 1857 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1858 1859 ieee80211_queue_work(&local->hw, &sdata->work); 1860 1861 return 0; 1862 } 1863 1864 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1865 { 1866 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1867 1868 ieee80211_ibss_disconnect(sdata); 1869 ifibss->ssid_len = 0; 1870 eth_zero_addr(ifibss->bssid); 1871 1872 /* remove beacon */ 1873 kfree(sdata->u.ibss.ie); 1874 sdata->u.ibss.ie = NULL; 1875 sdata->u.ibss.ie_len = 0; 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