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) 2018-2019 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rate_flags, rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->csa_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->csa_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224 { 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u32 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 sdata_assert_lock(sdata); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.bss_conf.ibss_joined) { 248 sdata->vif.bss_conf.ibss_joined = false; 249 sdata->vif.bss_conf.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = rcu_dereference_protected(ifibss->presp, 259 lockdep_is_held(&sdata->wdev.mtx)); 260 RCU_INIT_POINTER(ifibss->presp, NULL); 261 if (presp) 262 kfree_rcu(presp, rcu_head); 263 264 /* make a copy of the chandef, it could be modified below. */ 265 chandef = *req_chandef; 266 chan = chandef.chan; 267 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 268 NL80211_IFTYPE_ADHOC)) { 269 if (chandef.width == NL80211_CHAN_WIDTH_5 || 270 chandef.width == NL80211_CHAN_WIDTH_10 || 271 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 272 chandef.width == NL80211_CHAN_WIDTH_20) { 273 sdata_info(sdata, 274 "Failed to join IBSS, beacons forbidden\n"); 275 return; 276 } 277 chandef.width = NL80211_CHAN_WIDTH_20; 278 chandef.center_freq1 = chan->center_freq; 279 /* check again for downgraded chandef */ 280 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 281 NL80211_IFTYPE_ADHOC)) { 282 sdata_info(sdata, 283 "Failed to join IBSS, beacons forbidden\n"); 284 return; 285 } 286 } 287 288 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 289 &chandef, NL80211_IFTYPE_ADHOC); 290 if (err < 0) { 291 sdata_info(sdata, 292 "Failed to join IBSS, invalid chandef\n"); 293 return; 294 } 295 if (err > 0 && !ifibss->userspace_handles_dfs) { 296 sdata_info(sdata, 297 "Failed to join IBSS, DFS channel without control program\n"); 298 return; 299 } 300 301 radar_required = err; 302 303 mutex_lock(&local->mtx); 304 if (ieee80211_vif_use_channel(sdata, &chandef, 305 ifibss->fixed_channel ? 306 IEEE80211_CHANCTX_SHARED : 307 IEEE80211_CHANCTX_EXCLUSIVE)) { 308 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 309 mutex_unlock(&local->mtx); 310 return; 311 } 312 sdata->radar_required = radar_required; 313 mutex_unlock(&local->mtx); 314 315 memcpy(ifibss->bssid, bssid, ETH_ALEN); 316 317 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 318 capability, tsf, &chandef, 319 &have_higher_than_11mbit, NULL); 320 if (!presp) 321 return; 322 323 rcu_assign_pointer(ifibss->presp, presp); 324 mgmt = (void *)presp->head; 325 326 sdata->vif.bss_conf.enable_beacon = true; 327 sdata->vif.bss_conf.beacon_int = beacon_int; 328 sdata->vif.bss_conf.basic_rates = basic_rates; 329 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 330 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 331 bss_change = BSS_CHANGED_BEACON_INT; 332 bss_change |= ieee80211_reset_erp_info(sdata); 333 bss_change |= BSS_CHANGED_BSSID; 334 bss_change |= BSS_CHANGED_BEACON; 335 bss_change |= BSS_CHANGED_BEACON_ENABLED; 336 bss_change |= BSS_CHANGED_BASIC_RATES; 337 bss_change |= BSS_CHANGED_HT; 338 bss_change |= BSS_CHANGED_IBSS; 339 bss_change |= BSS_CHANGED_SSID; 340 341 /* 342 * In 5 GHz/802.11a, we can always use short slot time. 343 * (IEEE 802.11-2012 18.3.8.7) 344 * 345 * In 2.4GHz, we must always use long slots in IBSS for compatibility 346 * reasons. 347 * (IEEE 802.11-2012 19.4.5) 348 * 349 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 350 */ 351 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 352 bss_change |= BSS_CHANGED_ERP_SLOT; 353 354 /* cf. IEEE 802.11 9.2.12 */ 355 if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit) 356 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 357 else 358 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 359 360 ieee80211_set_wmm_default(sdata, true, false); 361 362 sdata->vif.bss_conf.ibss_joined = true; 363 sdata->vif.bss_conf.ibss_creator = creator; 364 365 err = drv_join_ibss(local, sdata); 366 if (err) { 367 sdata->vif.bss_conf.ibss_joined = false; 368 sdata->vif.bss_conf.ibss_creator = false; 369 sdata->vif.bss_conf.enable_beacon = false; 370 sdata->vif.bss_conf.ssid_len = 0; 371 RCU_INIT_POINTER(ifibss->presp, NULL); 372 kfree_rcu(presp, rcu_head); 373 mutex_lock(&local->mtx); 374 ieee80211_vif_release_channel(sdata); 375 mutex_unlock(&local->mtx); 376 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 377 err); 378 return; 379 } 380 381 ieee80211_bss_info_change_notify(sdata, bss_change); 382 383 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 384 mod_timer(&ifibss->timer, 385 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 386 387 bss_meta.chan = chan; 388 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 389 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 390 presp->head_len, GFP_KERNEL); 391 392 cfg80211_put_bss(local->hw.wiphy, bss); 393 netif_carrier_on(sdata->dev); 394 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 395 } 396 397 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 398 struct ieee80211_bss *bss) 399 { 400 struct cfg80211_bss *cbss = 401 container_of((void *)bss, struct cfg80211_bss, priv); 402 struct ieee80211_supported_band *sband; 403 struct cfg80211_chan_def chandef; 404 u32 basic_rates; 405 int i, j; 406 u16 beacon_int = cbss->beacon_interval; 407 const struct cfg80211_bss_ies *ies; 408 enum nl80211_channel_type chan_type; 409 u64 tsf; 410 u32 rate_flags; 411 int shift; 412 413 sdata_assert_lock(sdata); 414 415 if (beacon_int < 10) 416 beacon_int = 10; 417 418 switch (sdata->u.ibss.chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 case NL80211_CHAN_WIDTH_40: 422 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 423 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 424 break; 425 case NL80211_CHAN_WIDTH_5: 426 case NL80211_CHAN_WIDTH_10: 427 cfg80211_chandef_create(&chandef, cbss->channel, 428 NL80211_CHAN_NO_HT); 429 chandef.width = sdata->u.ibss.chandef.width; 430 break; 431 case NL80211_CHAN_WIDTH_80: 432 case NL80211_CHAN_WIDTH_80P80: 433 case NL80211_CHAN_WIDTH_160: 434 chandef = sdata->u.ibss.chandef; 435 chandef.chan = cbss->channel; 436 break; 437 default: 438 /* fall back to 20 MHz for unsupported modes */ 439 cfg80211_chandef_create(&chandef, cbss->channel, 440 NL80211_CHAN_NO_HT); 441 break; 442 } 443 444 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 445 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 446 shift = ieee80211_vif_get_shift(&sdata->vif); 447 448 basic_rates = 0; 449 450 for (i = 0; i < bss->supp_rates_len; i++) { 451 int rate = bss->supp_rates[i] & 0x7f; 452 bool is_basic = !!(bss->supp_rates[i] & 0x80); 453 454 for (j = 0; j < sband->n_bitrates; j++) { 455 int brate; 456 if ((rate_flags & sband->bitrates[j].flags) 457 != rate_flags) 458 continue; 459 460 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 461 5 * (1 << shift)); 462 if (brate == rate) { 463 if (is_basic) 464 basic_rates |= BIT(j); 465 break; 466 } 467 } 468 } 469 470 rcu_read_lock(); 471 ies = rcu_dereference(cbss->ies); 472 tsf = ies->tsf; 473 rcu_read_unlock(); 474 475 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 476 beacon_int, 477 &chandef, 478 basic_rates, 479 cbss->capability, 480 tsf, false); 481 } 482 483 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 484 struct cfg80211_csa_settings *csa_settings) 485 { 486 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 487 struct beacon_data *presp, *old_presp; 488 struct cfg80211_bss *cbss; 489 const struct cfg80211_bss_ies *ies; 490 u16 capability = WLAN_CAPABILITY_IBSS; 491 u64 tsf; 492 int ret = 0; 493 494 sdata_assert_lock(sdata); 495 496 if (ifibss->privacy) 497 capability |= WLAN_CAPABILITY_PRIVACY; 498 499 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 500 ifibss->bssid, ifibss->ssid, 501 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 502 IEEE80211_PRIVACY(ifibss->privacy)); 503 504 if (WARN_ON(!cbss)) { 505 ret = -EINVAL; 506 goto out; 507 } 508 509 rcu_read_lock(); 510 ies = rcu_dereference(cbss->ies); 511 tsf = ies->tsf; 512 rcu_read_unlock(); 513 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 514 515 old_presp = rcu_dereference_protected(ifibss->presp, 516 lockdep_is_held(&sdata->wdev.mtx)); 517 518 presp = ieee80211_ibss_build_presp(sdata, 519 sdata->vif.bss_conf.beacon_int, 520 sdata->vif.bss_conf.basic_rates, 521 capability, tsf, &ifibss->chandef, 522 NULL, csa_settings); 523 if (!presp) { 524 ret = -ENOMEM; 525 goto out; 526 } 527 528 rcu_assign_pointer(ifibss->presp, presp); 529 if (old_presp) 530 kfree_rcu(old_presp, rcu_head); 531 532 return BSS_CHANGED_BEACON; 533 out: 534 return ret; 535 } 536 537 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata) 538 { 539 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 540 struct cfg80211_bss *cbss; 541 542 sdata_assert_lock(sdata); 543 544 /* update cfg80211 bss information with the new channel */ 545 if (!is_zero_ether_addr(ifibss->bssid)) { 546 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 547 ifibss->chandef.chan, 548 ifibss->bssid, ifibss->ssid, 549 ifibss->ssid_len, 550 IEEE80211_BSS_TYPE_IBSS, 551 IEEE80211_PRIVACY(ifibss->privacy)); 552 /* XXX: should not really modify cfg80211 data */ 553 if (cbss) { 554 cbss->channel = sdata->csa_chandef.chan; 555 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 556 } 557 } 558 559 ifibss->chandef = sdata->csa_chandef; 560 561 /* generate the beacon */ 562 return ieee80211_ibss_csa_beacon(sdata, NULL); 563 } 564 565 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 566 { 567 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 568 569 cancel_work_sync(&ifibss->csa_connection_drop_work); 570 } 571 572 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 573 __acquires(RCU) 574 { 575 struct ieee80211_sub_if_data *sdata = sta->sdata; 576 u8 addr[ETH_ALEN]; 577 578 memcpy(addr, sta->sta.addr, ETH_ALEN); 579 580 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 581 582 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 583 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 584 /* authorize the station only if the network is not RSN protected. If 585 * not wait for the userspace to authorize it */ 586 if (!sta->sdata->u.ibss.control_port) 587 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 588 589 rate_control_rate_init(sta); 590 591 /* If it fails, maybe we raced another insertion? */ 592 if (sta_info_insert_rcu(sta)) 593 return sta_info_get(sdata, addr); 594 return sta; 595 } 596 597 static struct sta_info * 598 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 599 const u8 *addr, u32 supp_rates) 600 __acquires(RCU) 601 { 602 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 603 struct ieee80211_local *local = sdata->local; 604 struct sta_info *sta; 605 struct ieee80211_chanctx_conf *chanctx_conf; 606 struct ieee80211_supported_band *sband; 607 enum nl80211_bss_scan_width scan_width; 608 int band; 609 610 /* 611 * XXX: Consider removing the least recently used entry and 612 * allow new one to be added. 613 */ 614 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 615 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 616 sdata->name, addr); 617 rcu_read_lock(); 618 return NULL; 619 } 620 621 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 622 rcu_read_lock(); 623 return NULL; 624 } 625 626 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 627 rcu_read_lock(); 628 return NULL; 629 } 630 631 rcu_read_lock(); 632 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 633 if (WARN_ON_ONCE(!chanctx_conf)) 634 return NULL; 635 band = chanctx_conf->def.chan->band; 636 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 637 rcu_read_unlock(); 638 639 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 640 if (!sta) { 641 rcu_read_lock(); 642 return NULL; 643 } 644 645 /* make sure mandatory rates are always added */ 646 sband = local->hw.wiphy->bands[band]; 647 sta->sta.supp_rates[band] = supp_rates | 648 ieee80211_mandatory_rates(sband, scan_width); 649 650 return ieee80211_ibss_finish_sta(sta); 651 } 652 653 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 654 { 655 struct ieee80211_local *local = sdata->local; 656 int active = 0; 657 struct sta_info *sta; 658 659 sdata_assert_lock(sdata); 660 661 rcu_read_lock(); 662 663 list_for_each_entry_rcu(sta, &local->sta_list, list) { 664 unsigned long last_active = ieee80211_sta_last_active(sta); 665 666 if (sta->sdata == sdata && 667 time_is_after_jiffies(last_active + 668 IEEE80211_IBSS_MERGE_INTERVAL)) { 669 active++; 670 break; 671 } 672 } 673 674 rcu_read_unlock(); 675 676 return active; 677 } 678 679 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 680 { 681 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 682 struct ieee80211_local *local = sdata->local; 683 struct cfg80211_bss *cbss; 684 struct beacon_data *presp; 685 struct sta_info *sta; 686 687 if (!is_zero_ether_addr(ifibss->bssid)) { 688 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 689 ifibss->bssid, ifibss->ssid, 690 ifibss->ssid_len, 691 IEEE80211_BSS_TYPE_IBSS, 692 IEEE80211_PRIVACY(ifibss->privacy)); 693 694 if (cbss) { 695 cfg80211_unlink_bss(local->hw.wiphy, cbss); 696 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 697 } 698 } 699 700 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 701 702 sta_info_flush(sdata); 703 704 spin_lock_bh(&ifibss->incomplete_lock); 705 while (!list_empty(&ifibss->incomplete_stations)) { 706 sta = list_first_entry(&ifibss->incomplete_stations, 707 struct sta_info, list); 708 list_del(&sta->list); 709 spin_unlock_bh(&ifibss->incomplete_lock); 710 711 sta_info_free(local, sta); 712 spin_lock_bh(&ifibss->incomplete_lock); 713 } 714 spin_unlock_bh(&ifibss->incomplete_lock); 715 716 netif_carrier_off(sdata->dev); 717 718 sdata->vif.bss_conf.ibss_joined = false; 719 sdata->vif.bss_conf.ibss_creator = false; 720 sdata->vif.bss_conf.enable_beacon = false; 721 sdata->vif.bss_conf.ssid_len = 0; 722 723 /* remove beacon */ 724 presp = rcu_dereference_protected(ifibss->presp, 725 lockdep_is_held(&sdata->wdev.mtx)); 726 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 727 if (presp) 728 kfree_rcu(presp, rcu_head); 729 730 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 731 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 732 BSS_CHANGED_IBSS); 733 drv_leave_ibss(local, sdata); 734 mutex_lock(&local->mtx); 735 ieee80211_vif_release_channel(sdata); 736 mutex_unlock(&local->mtx); 737 } 738 739 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 740 { 741 struct ieee80211_sub_if_data *sdata = 742 container_of(work, struct ieee80211_sub_if_data, 743 u.ibss.csa_connection_drop_work); 744 745 sdata_lock(sdata); 746 747 ieee80211_ibss_disconnect(sdata); 748 synchronize_rcu(); 749 skb_queue_purge(&sdata->skb_queue); 750 751 /* trigger a scan to find another IBSS network to join */ 752 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 753 754 sdata_unlock(sdata); 755 } 756 757 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 758 { 759 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 760 int err; 761 762 /* if the current channel is a DFS channel, mark the channel as 763 * unavailable. 764 */ 765 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 766 &ifibss->chandef, 767 NL80211_IFTYPE_ADHOC); 768 if (err > 0) 769 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 770 GFP_ATOMIC); 771 } 772 773 static bool 774 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 775 struct ieee802_11_elems *elems, 776 bool beacon) 777 { 778 struct cfg80211_csa_settings params; 779 struct ieee80211_csa_ie csa_ie; 780 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 781 enum nl80211_channel_type ch_type; 782 int err; 783 u32 sta_flags; 784 785 sdata_assert_lock(sdata); 786 787 sta_flags = IEEE80211_STA_DISABLE_VHT; 788 switch (ifibss->chandef.width) { 789 case NL80211_CHAN_WIDTH_5: 790 case NL80211_CHAN_WIDTH_10: 791 case NL80211_CHAN_WIDTH_20_NOHT: 792 sta_flags |= IEEE80211_STA_DISABLE_HT; 793 /* fall through */ 794 case NL80211_CHAN_WIDTH_20: 795 sta_flags |= IEEE80211_STA_DISABLE_40MHZ; 796 break; 797 default: 798 break; 799 } 800 801 memset(¶ms, 0, sizeof(params)); 802 err = ieee80211_parse_ch_switch_ie(sdata, elems, 803 ifibss->chandef.chan->band, 804 sta_flags, ifibss->bssid, &csa_ie); 805 /* can't switch to destination channel, fail */ 806 if (err < 0) 807 goto disconnect; 808 809 /* did not contain a CSA */ 810 if (err) 811 return false; 812 813 /* channel switch is not supported, disconnect */ 814 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 815 goto disconnect; 816 817 params.count = csa_ie.count; 818 params.chandef = csa_ie.chandef; 819 820 switch (ifibss->chandef.width) { 821 case NL80211_CHAN_WIDTH_20_NOHT: 822 case NL80211_CHAN_WIDTH_20: 823 case NL80211_CHAN_WIDTH_40: 824 /* keep our current HT mode (HT20/HT40+/HT40-), even if 825 * another mode has been announced. The mode is not adopted 826 * within the beacon while doing CSA and we should therefore 827 * keep the mode which we announce. 828 */ 829 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 830 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 831 ch_type); 832 break; 833 case NL80211_CHAN_WIDTH_5: 834 case NL80211_CHAN_WIDTH_10: 835 if (params.chandef.width != ifibss->chandef.width) { 836 sdata_info(sdata, 837 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 838 ifibss->bssid, 839 params.chandef.chan->center_freq, 840 params.chandef.width, 841 params.chandef.center_freq1, 842 params.chandef.center_freq2); 843 goto disconnect; 844 } 845 break; 846 default: 847 /* should not happen, sta_flags should prevent VHT modes. */ 848 WARN_ON(1); 849 goto disconnect; 850 } 851 852 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 853 NL80211_IFTYPE_ADHOC)) { 854 sdata_info(sdata, 855 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 856 ifibss->bssid, 857 params.chandef.chan->center_freq, 858 params.chandef.width, 859 params.chandef.center_freq1, 860 params.chandef.center_freq2); 861 goto disconnect; 862 } 863 864 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 865 ¶ms.chandef, 866 NL80211_IFTYPE_ADHOC); 867 if (err < 0) 868 goto disconnect; 869 if (err > 0 && !ifibss->userspace_handles_dfs) { 870 /* IBSS-DFS only allowed with a control program */ 871 goto disconnect; 872 } 873 874 params.radar_required = err; 875 876 if (cfg80211_chandef_identical(¶ms.chandef, 877 &sdata->vif.bss_conf.chandef)) { 878 ibss_dbg(sdata, 879 "received csa with an identical chandef, ignoring\n"); 880 return true; 881 } 882 883 /* all checks done, now perform the channel switch. */ 884 ibss_dbg(sdata, 885 "received channel switch announcement to go to channel %d MHz\n", 886 params.chandef.chan->center_freq); 887 888 params.block_tx = !!csa_ie.mode; 889 890 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 891 ¶ms)) 892 goto disconnect; 893 894 ieee80211_ibss_csa_mark_radar(sdata); 895 896 return true; 897 disconnect: 898 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 899 ieee80211_queue_work(&sdata->local->hw, 900 &ifibss->csa_connection_drop_work); 901 902 ieee80211_ibss_csa_mark_radar(sdata); 903 904 return true; 905 } 906 907 static void 908 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 909 struct ieee80211_mgmt *mgmt, size_t len, 910 struct ieee80211_rx_status *rx_status, 911 struct ieee802_11_elems *elems) 912 { 913 int required_len; 914 915 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 916 return; 917 918 /* CSA is the only action we handle for now */ 919 if (mgmt->u.action.u.measurement.action_code != 920 WLAN_ACTION_SPCT_CHL_SWITCH) 921 return; 922 923 required_len = IEEE80211_MIN_ACTION_SIZE + 924 sizeof(mgmt->u.action.u.chan_switch); 925 if (len < required_len) 926 return; 927 928 if (!sdata->vif.csa_active) 929 ieee80211_ibss_process_chanswitch(sdata, elems, false); 930 } 931 932 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 933 struct ieee80211_mgmt *mgmt, 934 size_t len) 935 { 936 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 937 938 if (len < IEEE80211_DEAUTH_FRAME_LEN) 939 return; 940 941 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 942 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 943 sta_info_destroy_addr(sdata, mgmt->sa); 944 } 945 946 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 947 struct ieee80211_mgmt *mgmt, 948 size_t len) 949 { 950 u16 auth_alg, auth_transaction; 951 952 sdata_assert_lock(sdata); 953 954 if (len < 24 + 6) 955 return; 956 957 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 958 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 959 960 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 961 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 962 mgmt->bssid, auth_transaction); 963 964 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 965 return; 966 967 /* 968 * IEEE 802.11 standard does not require authentication in IBSS 969 * networks and most implementations do not seem to use it. 970 * However, try to reply to authentication attempts if someone 971 * has actually implemented this. 972 */ 973 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 974 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 975 } 976 977 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 978 struct ieee80211_mgmt *mgmt, size_t len, 979 struct ieee80211_rx_status *rx_status, 980 struct ieee802_11_elems *elems, 981 struct ieee80211_channel *channel) 982 { 983 struct sta_info *sta; 984 enum nl80211_band band = rx_status->band; 985 enum nl80211_bss_scan_width scan_width; 986 struct ieee80211_local *local = sdata->local; 987 struct ieee80211_supported_band *sband; 988 bool rates_updated = false; 989 u32 supp_rates = 0; 990 991 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 992 return; 993 994 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 995 return; 996 997 sband = local->hw.wiphy->bands[band]; 998 if (WARN_ON(!sband)) 999 return; 1000 1001 rcu_read_lock(); 1002 sta = sta_info_get(sdata, mgmt->sa); 1003 1004 if (elems->supp_rates) { 1005 supp_rates = ieee80211_sta_get_rates(sdata, elems, 1006 band, NULL); 1007 if (sta) { 1008 u32 prev_rates; 1009 1010 prev_rates = sta->sta.supp_rates[band]; 1011 /* make sure mandatory rates are always added */ 1012 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1013 if (rx_status->bw == RATE_INFO_BW_5) 1014 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1015 else if (rx_status->bw == RATE_INFO_BW_10) 1016 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1017 1018 sta->sta.supp_rates[band] = supp_rates | 1019 ieee80211_mandatory_rates(sband, scan_width); 1020 if (sta->sta.supp_rates[band] != prev_rates) { 1021 ibss_dbg(sdata, 1022 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1023 sta->sta.addr, prev_rates, 1024 sta->sta.supp_rates[band]); 1025 rates_updated = true; 1026 } 1027 } else { 1028 rcu_read_unlock(); 1029 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1030 mgmt->sa, supp_rates); 1031 } 1032 } 1033 1034 if (sta && !sta->sta.wme && 1035 elems->wmm_info && local->hw.queues >= IEEE80211_NUM_ACS) { 1036 sta->sta.wme = true; 1037 ieee80211_check_fast_xmit(sta); 1038 } 1039 1040 if (sta && elems->ht_operation && elems->ht_cap_elem && 1041 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1042 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1043 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1044 /* we both use HT */ 1045 struct ieee80211_ht_cap htcap_ie; 1046 struct cfg80211_chan_def chandef; 1047 enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; 1048 1049 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1050 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1051 1052 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1053 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1054 &htcap_ie, 1055 sta); 1056 1057 if (elems->vht_operation && elems->vht_cap_elem && 1058 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1059 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1060 /* we both use VHT */ 1061 struct ieee80211_vht_cap cap_ie; 1062 struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap; 1063 1064 ieee80211_chandef_vht_oper(&local->hw, 1065 elems->vht_operation, 1066 elems->ht_operation, 1067 &chandef); 1068 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1069 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1070 &cap_ie, sta); 1071 if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap))) 1072 rates_updated |= true; 1073 } 1074 1075 if (bw != sta->sta.bandwidth) 1076 rates_updated |= true; 1077 1078 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1079 &chandef)) 1080 WARN_ON_ONCE(1); 1081 } 1082 1083 if (sta && rates_updated) { 1084 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1085 u8 rx_nss = sta->sta.rx_nss; 1086 1087 /* Force rx_nss recalculation */ 1088 sta->sta.rx_nss = 0; 1089 rate_control_rate_init(sta); 1090 if (sta->sta.rx_nss != rx_nss) 1091 changed |= IEEE80211_RC_NSS_CHANGED; 1092 1093 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1094 } 1095 1096 rcu_read_unlock(); 1097 } 1098 1099 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1100 struct ieee80211_mgmt *mgmt, size_t len, 1101 struct ieee80211_rx_status *rx_status, 1102 struct ieee802_11_elems *elems) 1103 { 1104 struct ieee80211_local *local = sdata->local; 1105 struct cfg80211_bss *cbss; 1106 struct ieee80211_bss *bss; 1107 struct ieee80211_channel *channel; 1108 u64 beacon_timestamp, rx_timestamp; 1109 u32 supp_rates = 0; 1110 enum nl80211_band band = rx_status->band; 1111 1112 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1113 if (!channel) 1114 return; 1115 1116 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1117 1118 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1119 if (!bss) 1120 return; 1121 1122 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1123 1124 /* same for beacon and probe response */ 1125 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1126 1127 /* check if we need to merge IBSS */ 1128 1129 /* not an IBSS */ 1130 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1131 goto put_bss; 1132 1133 /* different channel */ 1134 if (sdata->u.ibss.fixed_channel && 1135 sdata->u.ibss.chandef.chan != cbss->channel) 1136 goto put_bss; 1137 1138 /* different SSID */ 1139 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1140 memcmp(elems->ssid, sdata->u.ibss.ssid, 1141 sdata->u.ibss.ssid_len)) 1142 goto put_bss; 1143 1144 /* process channel switch */ 1145 if (sdata->vif.csa_active || 1146 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1147 goto put_bss; 1148 1149 /* same BSSID */ 1150 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1151 goto put_bss; 1152 1153 /* we use a fixed BSSID */ 1154 if (sdata->u.ibss.fixed_bssid) 1155 goto put_bss; 1156 1157 if (ieee80211_have_rx_timestamp(rx_status)) { 1158 /* time when timestamp field was received */ 1159 rx_timestamp = 1160 ieee80211_calculate_rx_timestamp(local, rx_status, 1161 len + FCS_LEN, 24); 1162 } else { 1163 /* 1164 * second best option: get current TSF 1165 * (will return -1 if not supported) 1166 */ 1167 rx_timestamp = drv_get_tsf(local, sdata); 1168 } 1169 1170 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1171 mgmt->sa, mgmt->bssid, 1172 (unsigned long long)rx_timestamp); 1173 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1174 (unsigned long long)beacon_timestamp, 1175 (unsigned long long)(rx_timestamp - beacon_timestamp), 1176 jiffies); 1177 1178 if (beacon_timestamp > rx_timestamp) { 1179 ibss_dbg(sdata, 1180 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1181 mgmt->bssid); 1182 ieee80211_sta_join_ibss(sdata, bss); 1183 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1184 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1185 supp_rates); 1186 rcu_read_unlock(); 1187 } 1188 1189 put_bss: 1190 ieee80211_rx_bss_put(local, bss); 1191 } 1192 1193 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1194 const u8 *bssid, const u8 *addr, 1195 u32 supp_rates) 1196 { 1197 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1198 struct ieee80211_local *local = sdata->local; 1199 struct sta_info *sta; 1200 struct ieee80211_chanctx_conf *chanctx_conf; 1201 struct ieee80211_supported_band *sband; 1202 enum nl80211_bss_scan_width scan_width; 1203 int band; 1204 1205 /* 1206 * XXX: Consider removing the least recently used entry and 1207 * allow new one to be added. 1208 */ 1209 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1210 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1211 sdata->name, addr); 1212 return; 1213 } 1214 1215 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1216 return; 1217 1218 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1219 return; 1220 1221 rcu_read_lock(); 1222 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1223 if (WARN_ON_ONCE(!chanctx_conf)) { 1224 rcu_read_unlock(); 1225 return; 1226 } 1227 band = chanctx_conf->def.chan->band; 1228 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1229 rcu_read_unlock(); 1230 1231 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1232 if (!sta) 1233 return; 1234 1235 /* make sure mandatory rates are always added */ 1236 sband = local->hw.wiphy->bands[band]; 1237 sta->sta.supp_rates[band] = supp_rates | 1238 ieee80211_mandatory_rates(sband, scan_width); 1239 1240 spin_lock(&ifibss->incomplete_lock); 1241 list_add(&sta->list, &ifibss->incomplete_stations); 1242 spin_unlock(&ifibss->incomplete_lock); 1243 ieee80211_queue_work(&local->hw, &sdata->work); 1244 } 1245 1246 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1247 { 1248 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1249 struct ieee80211_local *local = sdata->local; 1250 struct sta_info *sta, *tmp; 1251 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1252 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1253 1254 mutex_lock(&local->sta_mtx); 1255 1256 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1257 unsigned long last_active = ieee80211_sta_last_active(sta); 1258 1259 if (sdata != sta->sdata) 1260 continue; 1261 1262 if (time_is_before_jiffies(last_active + exp_time) || 1263 (time_is_before_jiffies(last_active + exp_rsn) && 1264 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1265 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1266 1267 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1268 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1269 "not authorized " : "", sta->sta.addr); 1270 1271 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1272 ifibss->bssid, 1273 IEEE80211_STYPE_DEAUTH, 1274 WLAN_REASON_DEAUTH_LEAVING, 1275 true, frame_buf); 1276 WARN_ON(__sta_info_destroy(sta)); 1277 } 1278 } 1279 1280 mutex_unlock(&local->sta_mtx); 1281 } 1282 1283 /* 1284 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1285 */ 1286 1287 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1288 { 1289 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1290 enum nl80211_bss_scan_width scan_width; 1291 1292 sdata_assert_lock(sdata); 1293 1294 mod_timer(&ifibss->timer, 1295 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1296 1297 ieee80211_ibss_sta_expire(sdata); 1298 1299 if (time_before(jiffies, ifibss->last_scan_completed + 1300 IEEE80211_IBSS_MERGE_INTERVAL)) 1301 return; 1302 1303 if (ieee80211_sta_active_ibss(sdata)) 1304 return; 1305 1306 if (ifibss->fixed_channel) 1307 return; 1308 1309 sdata_info(sdata, 1310 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1311 1312 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1313 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1314 NULL, 0, scan_width); 1315 } 1316 1317 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1318 { 1319 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1320 u8 bssid[ETH_ALEN]; 1321 u16 capability; 1322 int i; 1323 1324 sdata_assert_lock(sdata); 1325 1326 if (ifibss->fixed_bssid) { 1327 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1328 } else { 1329 /* Generate random, not broadcast, locally administered BSSID. Mix in 1330 * own MAC address to make sure that devices that do not have proper 1331 * random number generator get different BSSID. */ 1332 get_random_bytes(bssid, ETH_ALEN); 1333 for (i = 0; i < ETH_ALEN; i++) 1334 bssid[i] ^= sdata->vif.addr[i]; 1335 bssid[0] &= ~0x01; 1336 bssid[0] |= 0x02; 1337 } 1338 1339 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1340 1341 capability = WLAN_CAPABILITY_IBSS; 1342 1343 if (ifibss->privacy) 1344 capability |= WLAN_CAPABILITY_PRIVACY; 1345 1346 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1347 &ifibss->chandef, ifibss->basic_rates, 1348 capability, 0, true); 1349 } 1350 1351 static unsigned ibss_setup_channels(struct wiphy *wiphy, 1352 struct ieee80211_channel **channels, 1353 unsigned int channels_max, 1354 u32 center_freq, u32 width) 1355 { 1356 struct ieee80211_channel *chan = NULL; 1357 unsigned int n_chan = 0; 1358 u32 start_freq, end_freq, freq; 1359 1360 if (width <= 20) { 1361 start_freq = center_freq; 1362 end_freq = center_freq; 1363 } else { 1364 start_freq = center_freq - width / 2 + 10; 1365 end_freq = center_freq + width / 2 - 10; 1366 } 1367 1368 for (freq = start_freq; freq <= end_freq; freq += 20) { 1369 chan = ieee80211_get_channel(wiphy, freq); 1370 if (!chan) 1371 continue; 1372 if (n_chan >= channels_max) 1373 return n_chan; 1374 1375 channels[n_chan] = chan; 1376 n_chan++; 1377 } 1378 1379 return n_chan; 1380 } 1381 1382 static unsigned int 1383 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1384 const struct cfg80211_chan_def *chandef, 1385 struct ieee80211_channel **channels, 1386 unsigned int channels_max) 1387 { 1388 unsigned int n_chan = 0; 1389 u32 width, cf1, cf2 = 0; 1390 1391 switch (chandef->width) { 1392 case NL80211_CHAN_WIDTH_40: 1393 width = 40; 1394 break; 1395 case NL80211_CHAN_WIDTH_80P80: 1396 cf2 = chandef->center_freq2; 1397 /* fall through */ 1398 case NL80211_CHAN_WIDTH_80: 1399 width = 80; 1400 break; 1401 case NL80211_CHAN_WIDTH_160: 1402 width = 160; 1403 break; 1404 default: 1405 width = 20; 1406 break; 1407 } 1408 1409 cf1 = chandef->center_freq1; 1410 1411 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1412 1413 if (cf2) 1414 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1415 channels_max - n_chan, cf2, 1416 width); 1417 1418 return n_chan; 1419 } 1420 1421 /* 1422 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1423 */ 1424 1425 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1426 { 1427 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1428 struct ieee80211_local *local = sdata->local; 1429 struct cfg80211_bss *cbss; 1430 struct ieee80211_channel *chan = NULL; 1431 const u8 *bssid = NULL; 1432 enum nl80211_bss_scan_width scan_width; 1433 int active_ibss; 1434 1435 sdata_assert_lock(sdata); 1436 1437 active_ibss = ieee80211_sta_active_ibss(sdata); 1438 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1439 1440 if (active_ibss) 1441 return; 1442 1443 if (ifibss->fixed_bssid) 1444 bssid = ifibss->bssid; 1445 if (ifibss->fixed_channel) 1446 chan = ifibss->chandef.chan; 1447 if (!is_zero_ether_addr(ifibss->bssid)) 1448 bssid = ifibss->bssid; 1449 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1450 ifibss->ssid, ifibss->ssid_len, 1451 IEEE80211_BSS_TYPE_IBSS, 1452 IEEE80211_PRIVACY(ifibss->privacy)); 1453 1454 if (cbss) { 1455 struct ieee80211_bss *bss; 1456 1457 bss = (void *)cbss->priv; 1458 ibss_dbg(sdata, 1459 "sta_find_ibss: selected %pM current %pM\n", 1460 cbss->bssid, ifibss->bssid); 1461 sdata_info(sdata, 1462 "Selected IBSS BSSID %pM based on configured SSID\n", 1463 cbss->bssid); 1464 1465 ieee80211_sta_join_ibss(sdata, bss); 1466 ieee80211_rx_bss_put(local, bss); 1467 return; 1468 } 1469 1470 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1471 * directly and do not waste time scanning 1472 */ 1473 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1474 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1475 bssid); 1476 ieee80211_sta_create_ibss(sdata); 1477 return; 1478 } 1479 1480 1481 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1482 1483 /* Selected IBSS not found in current scan results - try to scan */ 1484 if (time_after(jiffies, ifibss->last_scan_completed + 1485 IEEE80211_SCAN_INTERVAL)) { 1486 struct ieee80211_channel *channels[8]; 1487 unsigned int num; 1488 1489 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1490 1491 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1492 1493 if (ifibss->fixed_channel) { 1494 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1495 &ifibss->chandef, 1496 channels, 1497 ARRAY_SIZE(channels)); 1498 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1499 ifibss->ssid_len, channels, 1500 num, scan_width); 1501 } else { 1502 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1503 ifibss->ssid_len, NULL, 1504 0, scan_width); 1505 } 1506 } else { 1507 int interval = IEEE80211_SCAN_INTERVAL; 1508 1509 if (time_after(jiffies, ifibss->ibss_join_req + 1510 IEEE80211_IBSS_JOIN_TIMEOUT)) 1511 ieee80211_sta_create_ibss(sdata); 1512 1513 mod_timer(&ifibss->timer, 1514 round_jiffies(jiffies + interval)); 1515 } 1516 } 1517 1518 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1519 struct sk_buff *req) 1520 { 1521 struct ieee80211_mgmt *mgmt = (void *)req->data; 1522 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1523 struct ieee80211_local *local = sdata->local; 1524 int tx_last_beacon, len = req->len; 1525 struct sk_buff *skb; 1526 struct beacon_data *presp; 1527 u8 *pos, *end; 1528 1529 sdata_assert_lock(sdata); 1530 1531 presp = rcu_dereference_protected(ifibss->presp, 1532 lockdep_is_held(&sdata->wdev.mtx)); 1533 1534 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1535 len < 24 + 2 || !presp) 1536 return; 1537 1538 tx_last_beacon = drv_tx_last_beacon(local); 1539 1540 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1541 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1542 mgmt->bssid, tx_last_beacon); 1543 1544 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1545 return; 1546 1547 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1548 !is_broadcast_ether_addr(mgmt->bssid)) 1549 return; 1550 1551 end = ((u8 *) mgmt) + len; 1552 pos = mgmt->u.probe_req.variable; 1553 if (pos[0] != WLAN_EID_SSID || 1554 pos + 2 + pos[1] > end) { 1555 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1556 mgmt->sa); 1557 return; 1558 } 1559 if (pos[1] != 0 && 1560 (pos[1] != ifibss->ssid_len || 1561 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1562 /* Ignore ProbeReq for foreign SSID */ 1563 return; 1564 } 1565 1566 /* Reply with ProbeResp */ 1567 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1568 if (!skb) 1569 return; 1570 1571 skb_reserve(skb, local->tx_headroom); 1572 skb_put_data(skb, presp->head, presp->head_len); 1573 1574 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1575 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1576 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1577 1578 /* avoid excessive retries for probe request to wildcard SSIDs */ 1579 if (pos[1] == 0) 1580 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1581 1582 ieee80211_tx_skb(sdata, skb); 1583 } 1584 1585 static 1586 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1587 struct ieee80211_mgmt *mgmt, size_t len, 1588 struct ieee80211_rx_status *rx_status) 1589 { 1590 size_t baselen; 1591 struct ieee802_11_elems elems; 1592 1593 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1594 offsetof(typeof(mgmt->u.beacon), variable)); 1595 1596 /* 1597 * either beacon or probe_resp but the variable field is at the 1598 * same offset 1599 */ 1600 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1601 if (baselen > len) 1602 return; 1603 1604 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1605 false, &elems, mgmt->bssid, NULL); 1606 1607 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1608 } 1609 1610 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1611 struct sk_buff *skb) 1612 { 1613 struct ieee80211_rx_status *rx_status; 1614 struct ieee80211_mgmt *mgmt; 1615 u16 fc; 1616 struct ieee802_11_elems elems; 1617 int ies_len; 1618 1619 rx_status = IEEE80211_SKB_RXCB(skb); 1620 mgmt = (struct ieee80211_mgmt *) skb->data; 1621 fc = le16_to_cpu(mgmt->frame_control); 1622 1623 sdata_lock(sdata); 1624 1625 if (!sdata->u.ibss.ssid_len) 1626 goto mgmt_out; /* not ready to merge yet */ 1627 1628 switch (fc & IEEE80211_FCTL_STYPE) { 1629 case IEEE80211_STYPE_PROBE_REQ: 1630 ieee80211_rx_mgmt_probe_req(sdata, skb); 1631 break; 1632 case IEEE80211_STYPE_PROBE_RESP: 1633 case IEEE80211_STYPE_BEACON: 1634 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1635 rx_status); 1636 break; 1637 case IEEE80211_STYPE_AUTH: 1638 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1639 break; 1640 case IEEE80211_STYPE_DEAUTH: 1641 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1642 break; 1643 case IEEE80211_STYPE_ACTION: 1644 switch (mgmt->u.action.category) { 1645 case WLAN_CATEGORY_SPECTRUM_MGMT: 1646 ies_len = skb->len - 1647 offsetof(struct ieee80211_mgmt, 1648 u.action.u.chan_switch.variable); 1649 1650 if (ies_len < 0) 1651 break; 1652 1653 ieee802_11_parse_elems( 1654 mgmt->u.action.u.chan_switch.variable, 1655 ies_len, true, &elems, mgmt->bssid, NULL); 1656 1657 if (elems.parse_error) 1658 break; 1659 1660 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len, 1661 rx_status, &elems); 1662 break; 1663 } 1664 } 1665 1666 mgmt_out: 1667 sdata_unlock(sdata); 1668 } 1669 1670 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1671 { 1672 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1673 struct sta_info *sta; 1674 1675 sdata_lock(sdata); 1676 1677 /* 1678 * Work could be scheduled after scan or similar 1679 * when we aren't even joined (or trying) with a 1680 * network. 1681 */ 1682 if (!ifibss->ssid_len) 1683 goto out; 1684 1685 spin_lock_bh(&ifibss->incomplete_lock); 1686 while (!list_empty(&ifibss->incomplete_stations)) { 1687 sta = list_first_entry(&ifibss->incomplete_stations, 1688 struct sta_info, list); 1689 list_del(&sta->list); 1690 spin_unlock_bh(&ifibss->incomplete_lock); 1691 1692 ieee80211_ibss_finish_sta(sta); 1693 rcu_read_unlock(); 1694 spin_lock_bh(&ifibss->incomplete_lock); 1695 } 1696 spin_unlock_bh(&ifibss->incomplete_lock); 1697 1698 switch (ifibss->state) { 1699 case IEEE80211_IBSS_MLME_SEARCH: 1700 ieee80211_sta_find_ibss(sdata); 1701 break; 1702 case IEEE80211_IBSS_MLME_JOINED: 1703 ieee80211_sta_merge_ibss(sdata); 1704 break; 1705 default: 1706 WARN_ON(1); 1707 break; 1708 } 1709 1710 out: 1711 sdata_unlock(sdata); 1712 } 1713 1714 static void ieee80211_ibss_timer(struct timer_list *t) 1715 { 1716 struct ieee80211_sub_if_data *sdata = 1717 from_timer(sdata, t, u.ibss.timer); 1718 1719 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1720 } 1721 1722 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1723 { 1724 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1725 1726 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1727 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1728 spin_lock_init(&ifibss->incomplete_lock); 1729 INIT_WORK(&ifibss->csa_connection_drop_work, 1730 ieee80211_csa_connection_drop_work); 1731 } 1732 1733 /* scan finished notification */ 1734 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1735 { 1736 struct ieee80211_sub_if_data *sdata; 1737 1738 mutex_lock(&local->iflist_mtx); 1739 list_for_each_entry(sdata, &local->interfaces, list) { 1740 if (!ieee80211_sdata_running(sdata)) 1741 continue; 1742 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1743 continue; 1744 sdata->u.ibss.last_scan_completed = jiffies; 1745 } 1746 mutex_unlock(&local->iflist_mtx); 1747 } 1748 1749 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1750 struct cfg80211_ibss_params *params) 1751 { 1752 u32 changed = 0; 1753 u32 rate_flags; 1754 struct ieee80211_supported_band *sband; 1755 enum ieee80211_chanctx_mode chanmode; 1756 struct ieee80211_local *local = sdata->local; 1757 int radar_detect_width = 0; 1758 int i; 1759 int ret; 1760 1761 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1762 ¶ms->chandef, 1763 sdata->wdev.iftype); 1764 if (ret < 0) 1765 return ret; 1766 1767 if (ret > 0) { 1768 if (!params->userspace_handles_dfs) 1769 return -EINVAL; 1770 radar_detect_width = BIT(params->chandef.width); 1771 } 1772 1773 chanmode = (params->channel_fixed && !ret) ? 1774 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1775 1776 mutex_lock(&local->chanctx_mtx); 1777 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1778 radar_detect_width); 1779 mutex_unlock(&local->chanctx_mtx); 1780 if (ret < 0) 1781 return ret; 1782 1783 if (params->bssid) { 1784 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1785 sdata->u.ibss.fixed_bssid = true; 1786 } else 1787 sdata->u.ibss.fixed_bssid = false; 1788 1789 sdata->u.ibss.privacy = params->privacy; 1790 sdata->u.ibss.control_port = params->control_port; 1791 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1792 sdata->u.ibss.basic_rates = params->basic_rates; 1793 sdata->u.ibss.last_scan_completed = jiffies; 1794 1795 /* fix basic_rates if channel does not support these rates */ 1796 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1797 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1798 for (i = 0; i < sband->n_bitrates; i++) { 1799 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1800 sdata->u.ibss.basic_rates &= ~BIT(i); 1801 } 1802 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1803 sizeof(params->mcast_rate)); 1804 1805 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1806 1807 sdata->u.ibss.chandef = params->chandef; 1808 sdata->u.ibss.fixed_channel = params->channel_fixed; 1809 1810 if (params->ie) { 1811 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1812 GFP_KERNEL); 1813 if (sdata->u.ibss.ie) 1814 sdata->u.ibss.ie_len = params->ie_len; 1815 } 1816 1817 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1818 sdata->u.ibss.ibss_join_req = jiffies; 1819 1820 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1821 sdata->u.ibss.ssid_len = params->ssid_len; 1822 1823 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1824 sizeof(sdata->u.ibss.ht_capa)); 1825 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1826 sizeof(sdata->u.ibss.ht_capa_mask)); 1827 1828 /* 1829 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1830 * reserved, but an HT STA shall protect HT transmissions as though 1831 * the HT Protection field were set to non-HT mixed mode. 1832 * 1833 * In an IBSS, the RIFS Mode field of the HT Operation element is 1834 * also reserved, but an HT STA shall operate as though this field 1835 * were set to 1. 1836 */ 1837 1838 sdata->vif.bss_conf.ht_operation_mode |= 1839 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1840 | IEEE80211_HT_PARAM_RIFS_MODE; 1841 1842 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1843 ieee80211_bss_info_change_notify(sdata, changed); 1844 1845 sdata->smps_mode = IEEE80211_SMPS_OFF; 1846 sdata->needed_rx_chains = local->rx_chains; 1847 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1848 1849 ieee80211_queue_work(&local->hw, &sdata->work); 1850 1851 return 0; 1852 } 1853 1854 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1855 { 1856 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1857 1858 ieee80211_ibss_disconnect(sdata); 1859 ifibss->ssid_len = 0; 1860 eth_zero_addr(ifibss->bssid); 1861 1862 /* remove beacon */ 1863 kfree(sdata->u.ibss.ie); 1864 1865 /* on the next join, re-program HT parameters */ 1866 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1867 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1868 1869 synchronize_rcu(); 1870 1871 skb_queue_purge(&sdata->skb_queue); 1872 1873 del_timer_sync(&sdata->u.ibss.timer); 1874 1875 return 0; 1876 } 1877