1 /* 2 * IBSS mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 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 { 44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 45 struct ieee80211_local *local = sdata->local; 46 int rates_n = 0, i, ri; 47 struct ieee80211_mgmt *mgmt; 48 u8 *pos; 49 struct ieee80211_supported_band *sband; 50 u32 rate_flags, rates = 0, rates_added = 0; 51 struct beacon_data *presp; 52 int frame_len; 53 int shift; 54 55 /* Build IBSS probe response */ 56 frame_len = sizeof(struct ieee80211_hdr_3addr) + 57 12 /* struct ieee80211_mgmt.u.beacon */ + 58 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 59 2 + 8 /* max Supported Rates */ + 60 3 /* max DS params */ + 61 4 /* IBSS params */ + 62 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 63 2 + sizeof(struct ieee80211_ht_cap) + 64 2 + sizeof(struct ieee80211_ht_operation) + 65 ifibss->ie_len; 66 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 67 if (!presp) 68 return NULL; 69 70 presp->head = (void *)(presp + 1); 71 72 mgmt = (void *) presp->head; 73 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 74 IEEE80211_STYPE_PROBE_RESP); 75 eth_broadcast_addr(mgmt->da); 76 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 77 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 78 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 79 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 80 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 81 82 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 83 84 *pos++ = WLAN_EID_SSID; 85 *pos++ = ifibss->ssid_len; 86 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 87 pos += ifibss->ssid_len; 88 89 sband = local->hw.wiphy->bands[chandef->chan->band]; 90 rate_flags = ieee80211_chandef_rate_flags(chandef); 91 shift = ieee80211_chandef_get_shift(chandef); 92 rates_n = 0; 93 if (have_higher_than_11mbit) 94 *have_higher_than_11mbit = false; 95 96 for (i = 0; i < sband->n_bitrates; i++) { 97 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 98 continue; 99 if (sband->bitrates[i].bitrate > 110 && 100 have_higher_than_11mbit) 101 *have_higher_than_11mbit = true; 102 103 rates |= BIT(i); 104 rates_n++; 105 } 106 107 *pos++ = WLAN_EID_SUPP_RATES; 108 *pos++ = min_t(int, 8, rates_n); 109 for (ri = 0; ri < sband->n_bitrates; ri++) { 110 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 111 5 * (1 << shift)); 112 u8 basic = 0; 113 if (!(rates & BIT(ri))) 114 continue; 115 116 if (basic_rates & BIT(ri)) 117 basic = 0x80; 118 *pos++ = basic | (u8) rate; 119 if (++rates_added == 8) { 120 ri++; /* continue at next rate for EXT_SUPP_RATES */ 121 break; 122 } 123 } 124 125 if (sband->band == IEEE80211_BAND_2GHZ) { 126 *pos++ = WLAN_EID_DS_PARAMS; 127 *pos++ = 1; 128 *pos++ = ieee80211_frequency_to_channel( 129 chandef->chan->center_freq); 130 } 131 132 *pos++ = WLAN_EID_IBSS_PARAMS; 133 *pos++ = 2; 134 /* FIX: set ATIM window based on scan results */ 135 *pos++ = 0; 136 *pos++ = 0; 137 138 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 139 if (rates_n > 8) { 140 *pos++ = WLAN_EID_EXT_SUPP_RATES; 141 *pos++ = rates_n - 8; 142 for (; ri < sband->n_bitrates; ri++) { 143 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 144 5 * (1 << shift)); 145 u8 basic = 0; 146 if (!(rates & BIT(ri))) 147 continue; 148 149 if (basic_rates & BIT(ri)) 150 basic = 0x80; 151 *pos++ = basic | (u8) rate; 152 } 153 } 154 155 if (ifibss->ie_len) { 156 memcpy(pos, ifibss->ie, ifibss->ie_len); 157 pos += ifibss->ie_len; 158 } 159 160 /* add HT capability and information IEs */ 161 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 162 chandef->width != NL80211_CHAN_WIDTH_5 && 163 chandef->width != NL80211_CHAN_WIDTH_10 && 164 sband->ht_cap.ht_supported) { 165 struct ieee80211_sta_ht_cap ht_cap; 166 167 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 168 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 169 170 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 171 /* 172 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 173 * field and RIFS Mode are reserved in IBSS mode, therefore 174 * keep them at 0 175 */ 176 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 177 chandef, 0); 178 } 179 180 if (local->hw.queues >= IEEE80211_NUM_ACS) { 181 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 182 *pos++ = 7; /* len */ 183 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 184 *pos++ = 0x50; 185 *pos++ = 0xf2; 186 *pos++ = 2; /* WME */ 187 *pos++ = 0; /* WME info */ 188 *pos++ = 1; /* WME ver */ 189 *pos++ = 0; /* U-APSD no in use */ 190 } 191 192 presp->head_len = pos - presp->head; 193 if (WARN_ON(presp->head_len > frame_len)) 194 goto error; 195 196 return presp; 197 error: 198 kfree(presp); 199 return NULL; 200 } 201 202 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 203 const u8 *bssid, const int beacon_int, 204 struct cfg80211_chan_def *req_chandef, 205 const u32 basic_rates, 206 const u16 capability, u64 tsf, 207 bool creator) 208 { 209 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 210 struct ieee80211_local *local = sdata->local; 211 struct ieee80211_supported_band *sband; 212 struct ieee80211_mgmt *mgmt; 213 struct cfg80211_bss *bss; 214 u32 bss_change; 215 struct cfg80211_chan_def chandef; 216 struct ieee80211_channel *chan; 217 struct beacon_data *presp; 218 enum nl80211_bss_scan_width scan_width; 219 bool have_higher_than_11mbit; 220 221 sdata_assert_lock(sdata); 222 223 /* Reset own TSF to allow time synchronization work. */ 224 drv_reset_tsf(local, sdata); 225 226 if (!ether_addr_equal(ifibss->bssid, bssid)) 227 sta_info_flush(sdata); 228 229 /* if merging, indicate to driver that we leave the old IBSS */ 230 if (sdata->vif.bss_conf.ibss_joined) { 231 sdata->vif.bss_conf.ibss_joined = false; 232 sdata->vif.bss_conf.ibss_creator = false; 233 sdata->vif.bss_conf.enable_beacon = false; 234 netif_carrier_off(sdata->dev); 235 ieee80211_bss_info_change_notify(sdata, 236 BSS_CHANGED_IBSS | 237 BSS_CHANGED_BEACON_ENABLED); 238 } 239 240 presp = rcu_dereference_protected(ifibss->presp, 241 lockdep_is_held(&sdata->wdev.mtx)); 242 rcu_assign_pointer(ifibss->presp, NULL); 243 if (presp) 244 kfree_rcu(presp, rcu_head); 245 246 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; 247 248 /* make a copy of the chandef, it could be modified below. */ 249 chandef = *req_chandef; 250 chan = chandef.chan; 251 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) { 252 if (chandef.width == NL80211_CHAN_WIDTH_5 || 253 chandef.width == NL80211_CHAN_WIDTH_10 || 254 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 255 chandef.width == NL80211_CHAN_WIDTH_20) { 256 sdata_info(sdata, 257 "Failed to join IBSS, beacons forbidden\n"); 258 return; 259 } 260 chandef.width = NL80211_CHAN_WIDTH_20; 261 chandef.center_freq1 = chan->center_freq; 262 } 263 264 ieee80211_vif_release_channel(sdata); 265 if (ieee80211_vif_use_channel(sdata, &chandef, 266 ifibss->fixed_channel ? 267 IEEE80211_CHANCTX_SHARED : 268 IEEE80211_CHANCTX_EXCLUSIVE)) { 269 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 270 return; 271 } 272 273 memcpy(ifibss->bssid, bssid, ETH_ALEN); 274 275 sband = local->hw.wiphy->bands[chan->band]; 276 277 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 278 capability, tsf, &chandef, 279 &have_higher_than_11mbit); 280 if (!presp) 281 return; 282 283 rcu_assign_pointer(ifibss->presp, presp); 284 mgmt = (void *)presp->head; 285 286 sdata->vif.bss_conf.enable_beacon = true; 287 sdata->vif.bss_conf.beacon_int = beacon_int; 288 sdata->vif.bss_conf.basic_rates = basic_rates; 289 sdata->vif.bss_conf.ssid_len = ifibss->ssid_len; 290 memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len); 291 bss_change = BSS_CHANGED_BEACON_INT; 292 bss_change |= ieee80211_reset_erp_info(sdata); 293 bss_change |= BSS_CHANGED_BSSID; 294 bss_change |= BSS_CHANGED_BEACON; 295 bss_change |= BSS_CHANGED_BEACON_ENABLED; 296 bss_change |= BSS_CHANGED_BASIC_RATES; 297 bss_change |= BSS_CHANGED_HT; 298 bss_change |= BSS_CHANGED_IBSS; 299 bss_change |= BSS_CHANGED_SSID; 300 301 /* 302 * In 5 GHz/802.11a, we can always use short slot time. 303 * (IEEE 802.11-2012 18.3.8.7) 304 * 305 * In 2.4GHz, we must always use long slots in IBSS for compatibility 306 * reasons. 307 * (IEEE 802.11-2012 19.4.5) 308 * 309 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 310 */ 311 sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ; 312 bss_change |= BSS_CHANGED_ERP_SLOT; 313 314 /* cf. IEEE 802.11 9.2.12 */ 315 if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) 316 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 317 else 318 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 319 320 sdata->vif.bss_conf.ibss_joined = true; 321 sdata->vif.bss_conf.ibss_creator = creator; 322 ieee80211_bss_info_change_notify(sdata, bss_change); 323 324 ieee80211_set_wmm_default(sdata, true); 325 326 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 327 mod_timer(&ifibss->timer, 328 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 329 330 scan_width = cfg80211_chandef_to_scan_width(&chandef); 331 bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan, 332 scan_width, mgmt, 333 presp->head_len, 0, GFP_KERNEL); 334 cfg80211_put_bss(local->hw.wiphy, bss); 335 netif_carrier_on(sdata->dev); 336 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); 337 } 338 339 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 340 struct ieee80211_bss *bss) 341 { 342 struct cfg80211_bss *cbss = 343 container_of((void *)bss, struct cfg80211_bss, priv); 344 struct ieee80211_supported_band *sband; 345 struct cfg80211_chan_def chandef; 346 u32 basic_rates; 347 int i, j; 348 u16 beacon_int = cbss->beacon_interval; 349 const struct cfg80211_bss_ies *ies; 350 enum nl80211_channel_type chan_type; 351 u64 tsf; 352 u32 rate_flags; 353 int shift; 354 355 sdata_assert_lock(sdata); 356 357 if (beacon_int < 10) 358 beacon_int = 10; 359 360 switch (sdata->u.ibss.chandef.width) { 361 case NL80211_CHAN_WIDTH_20_NOHT: 362 case NL80211_CHAN_WIDTH_20: 363 case NL80211_CHAN_WIDTH_40: 364 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 365 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 366 break; 367 case NL80211_CHAN_WIDTH_5: 368 case NL80211_CHAN_WIDTH_10: 369 cfg80211_chandef_create(&chandef, cbss->channel, 370 NL80211_CHAN_WIDTH_20_NOHT); 371 chandef.width = sdata->u.ibss.chandef.width; 372 break; 373 default: 374 /* fall back to 20 MHz for unsupported modes */ 375 cfg80211_chandef_create(&chandef, cbss->channel, 376 NL80211_CHAN_WIDTH_20_NOHT); 377 break; 378 } 379 380 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 381 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 382 shift = ieee80211_vif_get_shift(&sdata->vif); 383 384 basic_rates = 0; 385 386 for (i = 0; i < bss->supp_rates_len; i++) { 387 int rate = bss->supp_rates[i] & 0x7f; 388 bool is_basic = !!(bss->supp_rates[i] & 0x80); 389 390 for (j = 0; j < sband->n_bitrates; j++) { 391 int brate; 392 if ((rate_flags & sband->bitrates[j].flags) 393 != rate_flags) 394 continue; 395 396 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 397 5 * (1 << shift)); 398 if (brate == rate) { 399 if (is_basic) 400 basic_rates |= BIT(j); 401 break; 402 } 403 } 404 } 405 406 rcu_read_lock(); 407 ies = rcu_dereference(cbss->ies); 408 tsf = ies->tsf; 409 rcu_read_unlock(); 410 411 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 412 beacon_int, 413 &chandef, 414 basic_rates, 415 cbss->capability, 416 tsf, false); 417 } 418 419 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 420 __acquires(RCU) 421 { 422 struct ieee80211_sub_if_data *sdata = sta->sdata; 423 u8 addr[ETH_ALEN]; 424 425 memcpy(addr, sta->sta.addr, ETH_ALEN); 426 427 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 428 429 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 430 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 431 /* authorize the station only if the network is not RSN protected. If 432 * not wait for the userspace to authorize it */ 433 if (!sta->sdata->u.ibss.control_port) 434 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 435 436 rate_control_rate_init(sta); 437 438 /* If it fails, maybe we raced another insertion? */ 439 if (sta_info_insert_rcu(sta)) 440 return sta_info_get(sdata, addr); 441 return sta; 442 } 443 444 static struct sta_info * 445 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 446 const u8 *addr, u32 supp_rates) 447 __acquires(RCU) 448 { 449 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 450 struct ieee80211_local *local = sdata->local; 451 struct sta_info *sta; 452 struct ieee80211_chanctx_conf *chanctx_conf; 453 struct ieee80211_supported_band *sband; 454 enum nl80211_bss_scan_width scan_width; 455 int band; 456 457 /* 458 * XXX: Consider removing the least recently used entry and 459 * allow new one to be added. 460 */ 461 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 462 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 463 sdata->name, addr); 464 rcu_read_lock(); 465 return NULL; 466 } 467 468 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 469 rcu_read_lock(); 470 return NULL; 471 } 472 473 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 474 rcu_read_lock(); 475 return NULL; 476 } 477 478 rcu_read_lock(); 479 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 480 if (WARN_ON_ONCE(!chanctx_conf)) 481 return NULL; 482 band = chanctx_conf->def.chan->band; 483 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 484 rcu_read_unlock(); 485 486 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 487 if (!sta) { 488 rcu_read_lock(); 489 return NULL; 490 } 491 492 sta->last_rx = jiffies; 493 494 /* make sure mandatory rates are always added */ 495 sband = local->hw.wiphy->bands[band]; 496 sta->sta.supp_rates[band] = supp_rates | 497 ieee80211_mandatory_rates(sband, scan_width); 498 499 return ieee80211_ibss_finish_sta(sta); 500 } 501 502 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 503 struct ieee80211_mgmt *mgmt, 504 size_t len) 505 { 506 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 507 508 if (len < IEEE80211_DEAUTH_FRAME_LEN) 509 return; 510 511 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n", 512 mgmt->sa, mgmt->da, mgmt->bssid, reason); 513 sta_info_destroy_addr(sdata, mgmt->sa); 514 } 515 516 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 517 struct ieee80211_mgmt *mgmt, 518 size_t len) 519 { 520 u16 auth_alg, auth_transaction; 521 522 sdata_assert_lock(sdata); 523 524 if (len < 24 + 6) 525 return; 526 527 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 528 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 529 530 ibss_dbg(sdata, 531 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n", 532 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 533 534 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 535 return; 536 537 /* 538 * IEEE 802.11 standard does not require authentication in IBSS 539 * networks and most implementations do not seem to use it. 540 * However, try to reply to authentication attempts if someone 541 * has actually implemented this. 542 */ 543 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 544 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 545 } 546 547 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 548 struct ieee80211_mgmt *mgmt, size_t len, 549 struct ieee80211_rx_status *rx_status, 550 struct ieee802_11_elems *elems) 551 { 552 struct ieee80211_local *local = sdata->local; 553 int freq; 554 struct cfg80211_bss *cbss; 555 struct ieee80211_bss *bss; 556 struct sta_info *sta; 557 struct ieee80211_channel *channel; 558 u64 beacon_timestamp, rx_timestamp; 559 u32 supp_rates = 0; 560 enum ieee80211_band band = rx_status->band; 561 enum nl80211_bss_scan_width scan_width; 562 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 563 bool rates_updated = false; 564 565 if (elems->ds_params) 566 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 567 band); 568 else 569 freq = rx_status->freq; 570 571 channel = ieee80211_get_channel(local->hw.wiphy, freq); 572 573 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 574 return; 575 576 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 577 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { 578 579 rcu_read_lock(); 580 sta = sta_info_get(sdata, mgmt->sa); 581 582 if (elems->supp_rates) { 583 supp_rates = ieee80211_sta_get_rates(sdata, elems, 584 band, NULL); 585 if (sta) { 586 u32 prev_rates; 587 588 prev_rates = sta->sta.supp_rates[band]; 589 /* make sure mandatory rates are always added */ 590 scan_width = NL80211_BSS_CHAN_WIDTH_20; 591 if (rx_status->flag & RX_FLAG_5MHZ) 592 scan_width = NL80211_BSS_CHAN_WIDTH_5; 593 if (rx_status->flag & RX_FLAG_10MHZ) 594 scan_width = NL80211_BSS_CHAN_WIDTH_10; 595 596 sta->sta.supp_rates[band] = supp_rates | 597 ieee80211_mandatory_rates(sband, 598 scan_width); 599 if (sta->sta.supp_rates[band] != prev_rates) { 600 ibss_dbg(sdata, 601 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 602 sta->sta.addr, prev_rates, 603 sta->sta.supp_rates[band]); 604 rates_updated = true; 605 } 606 } else { 607 rcu_read_unlock(); 608 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 609 mgmt->sa, supp_rates); 610 } 611 } 612 613 if (sta && elems->wmm_info) 614 set_sta_flag(sta, WLAN_STA_WME); 615 616 if (sta && elems->ht_operation && elems->ht_cap_elem && 617 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 618 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 619 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 620 /* we both use HT */ 621 struct ieee80211_ht_cap htcap_ie; 622 struct cfg80211_chan_def chandef; 623 624 ieee80211_ht_oper_to_chandef(channel, 625 elems->ht_operation, 626 &chandef); 627 628 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 629 630 /* 631 * fall back to HT20 if we don't use or use 632 * the other extension channel 633 */ 634 if (chandef.center_freq1 != 635 sdata->u.ibss.chandef.center_freq1) 636 htcap_ie.cap_info &= 637 cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40); 638 639 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap( 640 sdata, sband, &htcap_ie, sta); 641 } 642 643 if (sta && rates_updated) { 644 drv_sta_rc_update(local, sdata, &sta->sta, 645 IEEE80211_RC_SUPP_RATES_CHANGED); 646 rate_control_rate_init(sta); 647 } 648 649 rcu_read_unlock(); 650 } 651 652 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 653 channel); 654 if (!bss) 655 return; 656 657 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 658 659 /* same for beacon and probe response */ 660 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 661 662 /* check if we need to merge IBSS */ 663 664 /* we use a fixed BSSID */ 665 if (sdata->u.ibss.fixed_bssid) 666 goto put_bss; 667 668 /* not an IBSS */ 669 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 670 goto put_bss; 671 672 /* different channel */ 673 if (sdata->u.ibss.fixed_channel && 674 sdata->u.ibss.chandef.chan != cbss->channel) 675 goto put_bss; 676 677 /* different SSID */ 678 if (elems->ssid_len != sdata->u.ibss.ssid_len || 679 memcmp(elems->ssid, sdata->u.ibss.ssid, 680 sdata->u.ibss.ssid_len)) 681 goto put_bss; 682 683 /* same BSSID */ 684 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 685 goto put_bss; 686 687 if (ieee80211_have_rx_timestamp(rx_status)) { 688 /* time when timestamp field was received */ 689 rx_timestamp = 690 ieee80211_calculate_rx_timestamp(local, rx_status, 691 len + FCS_LEN, 24); 692 } else { 693 /* 694 * second best option: get current TSF 695 * (will return -1 if not supported) 696 */ 697 rx_timestamp = drv_get_tsf(local, sdata); 698 } 699 700 ibss_dbg(sdata, 701 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 702 mgmt->sa, mgmt->bssid, 703 (unsigned long long)rx_timestamp, 704 (unsigned long long)beacon_timestamp, 705 (unsigned long long)(rx_timestamp - beacon_timestamp), 706 jiffies); 707 708 if (beacon_timestamp > rx_timestamp) { 709 ibss_dbg(sdata, 710 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 711 mgmt->bssid); 712 ieee80211_sta_join_ibss(sdata, bss); 713 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 714 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 715 supp_rates); 716 rcu_read_unlock(); 717 } 718 719 put_bss: 720 ieee80211_rx_bss_put(local, bss); 721 } 722 723 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 724 const u8 *bssid, const u8 *addr, 725 u32 supp_rates) 726 { 727 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 728 struct ieee80211_local *local = sdata->local; 729 struct sta_info *sta; 730 struct ieee80211_chanctx_conf *chanctx_conf; 731 struct ieee80211_supported_band *sband; 732 enum nl80211_bss_scan_width scan_width; 733 int band; 734 735 /* 736 * XXX: Consider removing the least recently used entry and 737 * allow new one to be added. 738 */ 739 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 740 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 741 sdata->name, addr); 742 return; 743 } 744 745 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 746 return; 747 748 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 749 return; 750 751 rcu_read_lock(); 752 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 753 if (WARN_ON_ONCE(!chanctx_conf)) { 754 rcu_read_unlock(); 755 return; 756 } 757 band = chanctx_conf->def.chan->band; 758 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 759 rcu_read_unlock(); 760 761 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 762 if (!sta) 763 return; 764 765 sta->last_rx = jiffies; 766 767 /* make sure mandatory rates are always added */ 768 sband = local->hw.wiphy->bands[band]; 769 sta->sta.supp_rates[band] = supp_rates | 770 ieee80211_mandatory_rates(sband, scan_width); 771 772 spin_lock(&ifibss->incomplete_lock); 773 list_add(&sta->list, &ifibss->incomplete_stations); 774 spin_unlock(&ifibss->incomplete_lock); 775 ieee80211_queue_work(&local->hw, &sdata->work); 776 } 777 778 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 779 { 780 struct ieee80211_local *local = sdata->local; 781 int active = 0; 782 struct sta_info *sta; 783 784 sdata_assert_lock(sdata); 785 786 rcu_read_lock(); 787 788 list_for_each_entry_rcu(sta, &local->sta_list, list) { 789 if (sta->sdata == sdata && 790 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 791 jiffies)) { 792 active++; 793 break; 794 } 795 } 796 797 rcu_read_unlock(); 798 799 return active; 800 } 801 802 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 803 { 804 struct ieee80211_local *local = sdata->local; 805 struct sta_info *sta, *tmp; 806 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 807 unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 808 809 mutex_lock(&local->sta_mtx); 810 811 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 812 if (sdata != sta->sdata) 813 continue; 814 815 if (time_after(jiffies, sta->last_rx + exp_time) || 816 (time_after(jiffies, sta->last_rx + exp_rsn_time) && 817 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 818 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 819 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 820 "not authorized " : "", sta->sta.addr); 821 822 WARN_ON(__sta_info_destroy(sta)); 823 } 824 } 825 826 mutex_unlock(&local->sta_mtx); 827 } 828 829 /* 830 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 831 */ 832 833 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 834 { 835 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 836 enum nl80211_bss_scan_width scan_width; 837 838 sdata_assert_lock(sdata); 839 840 mod_timer(&ifibss->timer, 841 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 842 843 ieee80211_ibss_sta_expire(sdata); 844 845 if (time_before(jiffies, ifibss->last_scan_completed + 846 IEEE80211_IBSS_MERGE_INTERVAL)) 847 return; 848 849 if (ieee80211_sta_active_ibss(sdata)) 850 return; 851 852 if (ifibss->fixed_channel) 853 return; 854 855 sdata_info(sdata, 856 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 857 858 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 859 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 860 NULL, scan_width); 861 } 862 863 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 864 { 865 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 866 u8 bssid[ETH_ALEN]; 867 u16 capability; 868 int i; 869 870 sdata_assert_lock(sdata); 871 872 if (ifibss->fixed_bssid) { 873 memcpy(bssid, ifibss->bssid, ETH_ALEN); 874 } else { 875 /* Generate random, not broadcast, locally administered BSSID. Mix in 876 * own MAC address to make sure that devices that do not have proper 877 * random number generator get different BSSID. */ 878 get_random_bytes(bssid, ETH_ALEN); 879 for (i = 0; i < ETH_ALEN; i++) 880 bssid[i] ^= sdata->vif.addr[i]; 881 bssid[0] &= ~0x01; 882 bssid[0] |= 0x02; 883 } 884 885 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 886 887 capability = WLAN_CAPABILITY_IBSS; 888 889 if (ifibss->privacy) 890 capability |= WLAN_CAPABILITY_PRIVACY; 891 else 892 sdata->drop_unencrypted = 0; 893 894 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 895 &ifibss->chandef, ifibss->basic_rates, 896 capability, 0, true); 897 } 898 899 /* 900 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 901 */ 902 903 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 904 { 905 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 906 struct ieee80211_local *local = sdata->local; 907 struct cfg80211_bss *cbss; 908 struct ieee80211_channel *chan = NULL; 909 const u8 *bssid = NULL; 910 enum nl80211_bss_scan_width scan_width; 911 int active_ibss; 912 u16 capability; 913 914 sdata_assert_lock(sdata); 915 916 active_ibss = ieee80211_sta_active_ibss(sdata); 917 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 918 919 if (active_ibss) 920 return; 921 922 capability = WLAN_CAPABILITY_IBSS; 923 if (ifibss->privacy) 924 capability |= WLAN_CAPABILITY_PRIVACY; 925 if (ifibss->fixed_bssid) 926 bssid = ifibss->bssid; 927 if (ifibss->fixed_channel) 928 chan = ifibss->chandef.chan; 929 if (!is_zero_ether_addr(ifibss->bssid)) 930 bssid = ifibss->bssid; 931 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 932 ifibss->ssid, ifibss->ssid_len, 933 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, 934 capability); 935 936 if (cbss) { 937 struct ieee80211_bss *bss; 938 939 bss = (void *)cbss->priv; 940 ibss_dbg(sdata, 941 "sta_find_ibss: selected %pM current %pM\n", 942 cbss->bssid, ifibss->bssid); 943 sdata_info(sdata, 944 "Selected IBSS BSSID %pM based on configured SSID\n", 945 cbss->bssid); 946 947 ieee80211_sta_join_ibss(sdata, bss); 948 ieee80211_rx_bss_put(local, bss); 949 return; 950 } 951 952 /* if a fixed bssid and a fixed freq have been provided create the IBSS 953 * directly and do not waste time scanning 954 */ 955 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 956 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 957 bssid); 958 ieee80211_sta_create_ibss(sdata); 959 return; 960 } 961 962 963 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 964 965 /* Selected IBSS not found in current scan results - try to scan */ 966 if (time_after(jiffies, ifibss->last_scan_completed + 967 IEEE80211_SCAN_INTERVAL)) { 968 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 969 970 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 971 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 972 ifibss->ssid_len, chan, 973 scan_width); 974 } else { 975 int interval = IEEE80211_SCAN_INTERVAL; 976 977 if (time_after(jiffies, ifibss->ibss_join_req + 978 IEEE80211_IBSS_JOIN_TIMEOUT)) 979 ieee80211_sta_create_ibss(sdata); 980 981 mod_timer(&ifibss->timer, 982 round_jiffies(jiffies + interval)); 983 } 984 } 985 986 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 987 struct sk_buff *req) 988 { 989 struct ieee80211_mgmt *mgmt = (void *)req->data; 990 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 991 struct ieee80211_local *local = sdata->local; 992 int tx_last_beacon, len = req->len; 993 struct sk_buff *skb; 994 struct beacon_data *presp; 995 u8 *pos, *end; 996 997 sdata_assert_lock(sdata); 998 999 presp = rcu_dereference_protected(ifibss->presp, 1000 lockdep_is_held(&sdata->wdev.mtx)); 1001 1002 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1003 len < 24 + 2 || !presp) 1004 return; 1005 1006 tx_last_beacon = drv_tx_last_beacon(local); 1007 1008 ibss_dbg(sdata, 1009 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n", 1010 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon); 1011 1012 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1013 return; 1014 1015 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1016 !is_broadcast_ether_addr(mgmt->bssid)) 1017 return; 1018 1019 end = ((u8 *) mgmt) + len; 1020 pos = mgmt->u.probe_req.variable; 1021 if (pos[0] != WLAN_EID_SSID || 1022 pos + 2 + pos[1] > end) { 1023 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1024 mgmt->sa); 1025 return; 1026 } 1027 if (pos[1] != 0 && 1028 (pos[1] != ifibss->ssid_len || 1029 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1030 /* Ignore ProbeReq for foreign SSID */ 1031 return; 1032 } 1033 1034 /* Reply with ProbeResp */ 1035 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1036 if (!skb) 1037 return; 1038 1039 skb_reserve(skb, local->tx_headroom); 1040 memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); 1041 1042 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1043 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1044 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1045 ieee80211_tx_skb(sdata, skb); 1046 } 1047 1048 static 1049 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1050 struct ieee80211_mgmt *mgmt, size_t len, 1051 struct ieee80211_rx_status *rx_status) 1052 { 1053 size_t baselen; 1054 struct ieee802_11_elems elems; 1055 1056 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1057 offsetof(typeof(mgmt->u.beacon), variable)); 1058 1059 /* 1060 * either beacon or probe_resp but the variable field is at the 1061 * same offset 1062 */ 1063 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1064 if (baselen > len) 1065 return; 1066 1067 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1068 false, &elems); 1069 1070 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 1071 } 1072 1073 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1074 struct sk_buff *skb) 1075 { 1076 struct ieee80211_rx_status *rx_status; 1077 struct ieee80211_mgmt *mgmt; 1078 u16 fc; 1079 1080 rx_status = IEEE80211_SKB_RXCB(skb); 1081 mgmt = (struct ieee80211_mgmt *) skb->data; 1082 fc = le16_to_cpu(mgmt->frame_control); 1083 1084 sdata_lock(sdata); 1085 1086 if (!sdata->u.ibss.ssid_len) 1087 goto mgmt_out; /* not ready to merge yet */ 1088 1089 switch (fc & IEEE80211_FCTL_STYPE) { 1090 case IEEE80211_STYPE_PROBE_REQ: 1091 ieee80211_rx_mgmt_probe_req(sdata, skb); 1092 break; 1093 case IEEE80211_STYPE_PROBE_RESP: 1094 case IEEE80211_STYPE_BEACON: 1095 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1096 rx_status); 1097 break; 1098 case IEEE80211_STYPE_AUTH: 1099 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1100 break; 1101 case IEEE80211_STYPE_DEAUTH: 1102 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1103 break; 1104 } 1105 1106 mgmt_out: 1107 sdata_unlock(sdata); 1108 } 1109 1110 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1111 { 1112 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1113 struct sta_info *sta; 1114 1115 sdata_lock(sdata); 1116 1117 /* 1118 * Work could be scheduled after scan or similar 1119 * when we aren't even joined (or trying) with a 1120 * network. 1121 */ 1122 if (!ifibss->ssid_len) 1123 goto out; 1124 1125 spin_lock_bh(&ifibss->incomplete_lock); 1126 while (!list_empty(&ifibss->incomplete_stations)) { 1127 sta = list_first_entry(&ifibss->incomplete_stations, 1128 struct sta_info, list); 1129 list_del(&sta->list); 1130 spin_unlock_bh(&ifibss->incomplete_lock); 1131 1132 ieee80211_ibss_finish_sta(sta); 1133 rcu_read_unlock(); 1134 spin_lock_bh(&ifibss->incomplete_lock); 1135 } 1136 spin_unlock_bh(&ifibss->incomplete_lock); 1137 1138 switch (ifibss->state) { 1139 case IEEE80211_IBSS_MLME_SEARCH: 1140 ieee80211_sta_find_ibss(sdata); 1141 break; 1142 case IEEE80211_IBSS_MLME_JOINED: 1143 ieee80211_sta_merge_ibss(sdata); 1144 break; 1145 default: 1146 WARN_ON(1); 1147 break; 1148 } 1149 1150 out: 1151 sdata_unlock(sdata); 1152 } 1153 1154 static void ieee80211_ibss_timer(unsigned long data) 1155 { 1156 struct ieee80211_sub_if_data *sdata = 1157 (struct ieee80211_sub_if_data *) data; 1158 1159 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1160 } 1161 1162 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1163 { 1164 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1165 1166 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1167 (unsigned long) sdata); 1168 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1169 spin_lock_init(&ifibss->incomplete_lock); 1170 } 1171 1172 /* scan finished notification */ 1173 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1174 { 1175 struct ieee80211_sub_if_data *sdata; 1176 1177 mutex_lock(&local->iflist_mtx); 1178 list_for_each_entry(sdata, &local->interfaces, list) { 1179 if (!ieee80211_sdata_running(sdata)) 1180 continue; 1181 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1182 continue; 1183 sdata->u.ibss.last_scan_completed = jiffies; 1184 ieee80211_queue_work(&local->hw, &sdata->work); 1185 } 1186 mutex_unlock(&local->iflist_mtx); 1187 } 1188 1189 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1190 struct cfg80211_ibss_params *params) 1191 { 1192 u32 changed = 0; 1193 u32 rate_flags; 1194 struct ieee80211_supported_band *sband; 1195 int i; 1196 1197 if (params->bssid) { 1198 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1199 sdata->u.ibss.fixed_bssid = true; 1200 } else 1201 sdata->u.ibss.fixed_bssid = false; 1202 1203 sdata->u.ibss.privacy = params->privacy; 1204 sdata->u.ibss.control_port = params->control_port; 1205 sdata->u.ibss.basic_rates = params->basic_rates; 1206 1207 /* fix basic_rates if channel does not support these rates */ 1208 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1209 sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band]; 1210 for (i = 0; i < sband->n_bitrates; i++) { 1211 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1212 sdata->u.ibss.basic_rates &= ~BIT(i); 1213 } 1214 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1215 sizeof(params->mcast_rate)); 1216 1217 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1218 1219 sdata->u.ibss.chandef = params->chandef; 1220 sdata->u.ibss.fixed_channel = params->channel_fixed; 1221 1222 if (params->ie) { 1223 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1224 GFP_KERNEL); 1225 if (sdata->u.ibss.ie) 1226 sdata->u.ibss.ie_len = params->ie_len; 1227 } 1228 1229 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1230 sdata->u.ibss.ibss_join_req = jiffies; 1231 1232 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1233 sdata->u.ibss.ssid_len = params->ssid_len; 1234 1235 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1236 sizeof(sdata->u.ibss.ht_capa)); 1237 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1238 sizeof(sdata->u.ibss.ht_capa_mask)); 1239 1240 /* 1241 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1242 * reserved, but an HT STA shall protect HT transmissions as though 1243 * the HT Protection field were set to non-HT mixed mode. 1244 * 1245 * In an IBSS, the RIFS Mode field of the HT Operation element is 1246 * also reserved, but an HT STA shall operate as though this field 1247 * were set to 1. 1248 */ 1249 1250 sdata->vif.bss_conf.ht_operation_mode |= 1251 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1252 | IEEE80211_HT_PARAM_RIFS_MODE; 1253 1254 changed |= BSS_CHANGED_HT; 1255 ieee80211_bss_info_change_notify(sdata, changed); 1256 1257 sdata->smps_mode = IEEE80211_SMPS_OFF; 1258 sdata->needed_rx_chains = sdata->local->rx_chains; 1259 1260 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1261 1262 return 0; 1263 } 1264 1265 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1266 { 1267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1268 struct ieee80211_local *local = sdata->local; 1269 struct cfg80211_bss *cbss; 1270 u16 capability; 1271 int active_ibss; 1272 struct sta_info *sta; 1273 struct beacon_data *presp; 1274 1275 active_ibss = ieee80211_sta_active_ibss(sdata); 1276 1277 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { 1278 capability = WLAN_CAPABILITY_IBSS; 1279 1280 if (ifibss->privacy) 1281 capability |= WLAN_CAPABILITY_PRIVACY; 1282 1283 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 1284 ifibss->bssid, ifibss->ssid, 1285 ifibss->ssid_len, WLAN_CAPABILITY_IBSS | 1286 WLAN_CAPABILITY_PRIVACY, 1287 capability); 1288 1289 if (cbss) { 1290 cfg80211_unlink_bss(local->hw.wiphy, cbss); 1291 cfg80211_put_bss(local->hw.wiphy, cbss); 1292 } 1293 } 1294 1295 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 1296 memset(ifibss->bssid, 0, ETH_ALEN); 1297 ifibss->ssid_len = 0; 1298 1299 sta_info_flush(sdata); 1300 1301 spin_lock_bh(&ifibss->incomplete_lock); 1302 while (!list_empty(&ifibss->incomplete_stations)) { 1303 sta = list_first_entry(&ifibss->incomplete_stations, 1304 struct sta_info, list); 1305 list_del(&sta->list); 1306 spin_unlock_bh(&ifibss->incomplete_lock); 1307 1308 sta_info_free(local, sta); 1309 spin_lock_bh(&ifibss->incomplete_lock); 1310 } 1311 spin_unlock_bh(&ifibss->incomplete_lock); 1312 1313 netif_carrier_off(sdata->dev); 1314 1315 /* remove beacon */ 1316 kfree(sdata->u.ibss.ie); 1317 presp = rcu_dereference_protected(ifibss->presp, 1318 lockdep_is_held(&sdata->wdev.mtx)); 1319 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 1320 1321 /* on the next join, re-program HT parameters */ 1322 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1323 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1324 1325 sdata->vif.bss_conf.ibss_joined = false; 1326 sdata->vif.bss_conf.ibss_creator = false; 1327 sdata->vif.bss_conf.enable_beacon = false; 1328 sdata->vif.bss_conf.ssid_len = 0; 1329 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 1330 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 1331 BSS_CHANGED_IBSS); 1332 ieee80211_vif_release_channel(sdata); 1333 synchronize_rcu(); 1334 kfree(presp); 1335 1336 skb_queue_purge(&sdata->skb_queue); 1337 1338 del_timer_sync(&sdata->u.ibss.timer); 1339 1340 return 0; 1341 } 1342