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_SCAN_INTERVAL_SLOW (15 * HZ) 30 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 31 32 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 33 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 38 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 39 const u8 *bssid, const int beacon_int, 40 struct ieee80211_channel *chan, 41 const u32 basic_rates, 42 const u16 capability, u64 tsf) 43 { 44 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 45 struct ieee80211_local *local = sdata->local; 46 int rates, i; 47 struct sk_buff *skb; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 struct cfg80211_bss *bss; 52 u32 bss_change; 53 u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; 54 enum nl80211_channel_type channel_type; 55 56 lockdep_assert_held(&ifibss->mtx); 57 58 /* Reset own TSF to allow time synchronization work. */ 59 drv_reset_tsf(local, sdata); 60 61 skb = ifibss->skb; 62 RCU_INIT_POINTER(ifibss->presp, NULL); 63 synchronize_rcu(); 64 skb->data = skb->head; 65 skb->len = 0; 66 skb_reset_tail_pointer(skb); 67 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 68 69 if (!ether_addr_equal(ifibss->bssid, bssid)) 70 sta_info_flush(sdata->local, sdata); 71 72 /* if merging, indicate to driver that we leave the old IBSS */ 73 if (sdata->vif.bss_conf.ibss_joined) { 74 sdata->vif.bss_conf.ibss_joined = false; 75 netif_carrier_off(sdata->dev); 76 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IBSS); 77 } 78 79 memcpy(ifibss->bssid, bssid, ETH_ALEN); 80 81 sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0; 82 83 local->oper_channel = chan; 84 channel_type = ifibss->channel_type; 85 if (channel_type > NL80211_CHAN_HT20 && 86 !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type)) 87 channel_type = NL80211_CHAN_HT20; 88 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 89 /* can only fail due to HT40+/- mismatch */ 90 channel_type = NL80211_CHAN_HT20; 91 WARN_ON(!ieee80211_set_channel_type(local, sdata, 92 NL80211_CHAN_HT20)); 93 } 94 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 95 96 sband = local->hw.wiphy->bands[chan->band]; 97 98 /* build supported rates array */ 99 pos = supp_rates; 100 for (i = 0; i < sband->n_bitrates; i++) { 101 int rate = sband->bitrates[i].bitrate; 102 u8 basic = 0; 103 if (basic_rates & BIT(i)) 104 basic = 0x80; 105 *pos++ = basic | (u8) (rate / 5); 106 } 107 108 /* Build IBSS probe response */ 109 mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 110 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 111 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 112 IEEE80211_STYPE_PROBE_RESP); 113 memset(mgmt->da, 0xff, ETH_ALEN); 114 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 115 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 116 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 117 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 118 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 119 120 pos = skb_put(skb, 2 + ifibss->ssid_len); 121 *pos++ = WLAN_EID_SSID; 122 *pos++ = ifibss->ssid_len; 123 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 124 125 rates = sband->n_bitrates; 126 if (rates > 8) 127 rates = 8; 128 pos = skb_put(skb, 2 + rates); 129 *pos++ = WLAN_EID_SUPP_RATES; 130 *pos++ = rates; 131 memcpy(pos, supp_rates, rates); 132 133 if (sband->band == IEEE80211_BAND_2GHZ) { 134 pos = skb_put(skb, 2 + 1); 135 *pos++ = WLAN_EID_DS_PARAMS; 136 *pos++ = 1; 137 *pos++ = ieee80211_frequency_to_channel(chan->center_freq); 138 } 139 140 pos = skb_put(skb, 2 + 2); 141 *pos++ = WLAN_EID_IBSS_PARAMS; 142 *pos++ = 2; 143 /* FIX: set ATIM window based on scan results */ 144 *pos++ = 0; 145 *pos++ = 0; 146 147 if (sband->n_bitrates > 8) { 148 rates = sband->n_bitrates - 8; 149 pos = skb_put(skb, 2 + rates); 150 *pos++ = WLAN_EID_EXT_SUPP_RATES; 151 *pos++ = rates; 152 memcpy(pos, &supp_rates[8], rates); 153 } 154 155 if (ifibss->ie_len) 156 memcpy(skb_put(skb, ifibss->ie_len), 157 ifibss->ie, ifibss->ie_len); 158 159 /* add HT capability and information IEs */ 160 if (channel_type && sband->ht_cap.ht_supported) { 161 pos = skb_put(skb, 4 + 162 sizeof(struct ieee80211_ht_cap) + 163 sizeof(struct ieee80211_ht_operation)); 164 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, 165 sband->ht_cap.cap); 166 /* 167 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 168 * field and RIFS Mode are reserved in IBSS mode, therefore 169 * keep them at 0 170 */ 171 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 172 chan, channel_type, 0); 173 } 174 175 if (local->hw.queues >= IEEE80211_NUM_ACS) { 176 pos = skb_put(skb, 9); 177 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 178 *pos++ = 7; /* len */ 179 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 180 *pos++ = 0x50; 181 *pos++ = 0xf2; 182 *pos++ = 2; /* WME */ 183 *pos++ = 0; /* WME info */ 184 *pos++ = 1; /* WME ver */ 185 *pos++ = 0; /* U-APSD no in use */ 186 } 187 188 rcu_assign_pointer(ifibss->presp, skb); 189 190 sdata->vif.bss_conf.beacon_int = beacon_int; 191 sdata->vif.bss_conf.basic_rates = basic_rates; 192 bss_change = BSS_CHANGED_BEACON_INT; 193 bss_change |= ieee80211_reset_erp_info(sdata); 194 bss_change |= BSS_CHANGED_BSSID; 195 bss_change |= BSS_CHANGED_BEACON; 196 bss_change |= BSS_CHANGED_BEACON_ENABLED; 197 bss_change |= BSS_CHANGED_BASIC_RATES; 198 bss_change |= BSS_CHANGED_HT; 199 bss_change |= BSS_CHANGED_IBSS; 200 sdata->vif.bss_conf.ibss_joined = true; 201 ieee80211_bss_info_change_notify(sdata, bss_change); 202 203 ieee80211_sta_def_wmm_params(sdata, sband->n_bitrates, supp_rates); 204 205 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 206 mod_timer(&ifibss->timer, 207 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 208 209 bss = cfg80211_inform_bss_frame(local->hw.wiphy, local->hw.conf.channel, 210 mgmt, skb->len, 0, GFP_KERNEL); 211 cfg80211_put_bss(bss); 212 netif_carrier_on(sdata->dev); 213 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL); 214 } 215 216 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 217 struct ieee80211_bss *bss) 218 { 219 struct cfg80211_bss *cbss = 220 container_of((void *)bss, struct cfg80211_bss, priv); 221 struct ieee80211_supported_band *sband; 222 u32 basic_rates; 223 int i, j; 224 u16 beacon_int = cbss->beacon_interval; 225 226 lockdep_assert_held(&sdata->u.ibss.mtx); 227 228 if (beacon_int < 10) 229 beacon_int = 10; 230 231 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 232 233 basic_rates = 0; 234 235 for (i = 0; i < bss->supp_rates_len; i++) { 236 int rate = (bss->supp_rates[i] & 0x7f) * 5; 237 bool is_basic = !!(bss->supp_rates[i] & 0x80); 238 239 for (j = 0; j < sband->n_bitrates; j++) { 240 if (sband->bitrates[j].bitrate == rate) { 241 if (is_basic) 242 basic_rates |= BIT(j); 243 break; 244 } 245 } 246 } 247 248 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 249 beacon_int, 250 cbss->channel, 251 basic_rates, 252 cbss->capability, 253 cbss->tsf); 254 } 255 256 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta, 257 bool auth) 258 __acquires(RCU) 259 { 260 struct ieee80211_sub_if_data *sdata = sta->sdata; 261 u8 addr[ETH_ALEN]; 262 263 memcpy(addr, sta->sta.addr, ETH_ALEN); 264 265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 266 wiphy_debug(sdata->local->hw.wiphy, 267 "Adding new IBSS station %pM (dev=%s)\n", 268 addr, sdata->name); 269 #endif 270 271 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 272 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 273 /* authorize the station only if the network is not RSN protected. If 274 * not wait for the userspace to authorize it */ 275 if (!sta->sdata->u.ibss.control_port) 276 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 277 278 rate_control_rate_init(sta); 279 280 /* If it fails, maybe we raced another insertion? */ 281 if (sta_info_insert_rcu(sta)) 282 return sta_info_get(sdata, addr); 283 if (auth) { 284 #ifdef CONFIG_MAC80211_IBSS_DEBUG 285 printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM" 286 "(auth_transaction=1)\n", sdata->vif.addr, 287 sdata->u.ibss.bssid, addr); 288 #endif 289 ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0, 290 addr, sdata->u.ibss.bssid, NULL, 0, 0); 291 } 292 return sta; 293 } 294 295 static struct sta_info * 296 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, 297 const u8 *bssid, const u8 *addr, 298 u32 supp_rates, bool auth) 299 __acquires(RCU) 300 { 301 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 302 struct ieee80211_local *local = sdata->local; 303 struct sta_info *sta; 304 int band = local->hw.conf.channel->band; 305 306 /* 307 * XXX: Consider removing the least recently used entry and 308 * allow new one to be added. 309 */ 310 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 311 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 312 sdata->name, addr); 313 rcu_read_lock(); 314 return NULL; 315 } 316 317 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 318 rcu_read_lock(); 319 return NULL; 320 } 321 322 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 323 rcu_read_lock(); 324 return NULL; 325 } 326 327 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 328 if (!sta) { 329 rcu_read_lock(); 330 return NULL; 331 } 332 333 sta->last_rx = jiffies; 334 335 /* make sure mandatory rates are always added */ 336 sta->sta.supp_rates[band] = supp_rates | 337 ieee80211_mandatory_rates(local, band); 338 339 return ieee80211_ibss_finish_sta(sta, auth); 340 } 341 342 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 343 struct ieee80211_mgmt *mgmt, 344 size_t len) 345 { 346 u16 auth_alg, auth_transaction; 347 348 lockdep_assert_held(&sdata->u.ibss.mtx); 349 350 if (len < 24 + 6) 351 return; 352 353 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 354 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 355 356 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 357 return; 358 #ifdef CONFIG_MAC80211_IBSS_DEBUG 359 printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM." 360 "(auth_transaction=%d)\n", 361 sdata->name, mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction); 362 #endif 363 sta_info_destroy_addr(sdata, mgmt->sa); 364 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false); 365 rcu_read_unlock(); 366 367 /* 368 * IEEE 802.11 standard does not require authentication in IBSS 369 * networks and most implementations do not seem to use it. 370 * However, try to reply to authentication attempts if someone 371 * has actually implemented this. 372 */ 373 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, 374 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0); 375 } 376 377 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 378 struct ieee80211_mgmt *mgmt, 379 size_t len, 380 struct ieee80211_rx_status *rx_status, 381 struct ieee802_11_elems *elems, 382 bool beacon) 383 { 384 struct ieee80211_local *local = sdata->local; 385 int freq; 386 struct cfg80211_bss *cbss; 387 struct ieee80211_bss *bss; 388 struct sta_info *sta; 389 struct ieee80211_channel *channel; 390 u64 beacon_timestamp, rx_timestamp; 391 u32 supp_rates = 0; 392 enum ieee80211_band band = rx_status->band; 393 struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; 394 bool rates_updated = false; 395 396 if (elems->ds_params && elems->ds_params_len == 1) 397 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 398 band); 399 else 400 freq = rx_status->freq; 401 402 channel = ieee80211_get_channel(local->hw.wiphy, freq); 403 404 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 405 return; 406 407 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 408 ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) { 409 410 rcu_read_lock(); 411 sta = sta_info_get(sdata, mgmt->sa); 412 413 if (elems->supp_rates) { 414 supp_rates = ieee80211_sta_get_rates(local, elems, 415 band, NULL); 416 if (sta) { 417 u32 prev_rates; 418 419 prev_rates = sta->sta.supp_rates[band]; 420 /* make sure mandatory rates are always added */ 421 sta->sta.supp_rates[band] = supp_rates | 422 ieee80211_mandatory_rates(local, band); 423 424 if (sta->sta.supp_rates[band] != prev_rates) { 425 #ifdef CONFIG_MAC80211_IBSS_DEBUG 426 printk(KERN_DEBUG 427 "%s: updated supp_rates set " 428 "for %pM based on beacon" 429 "/probe_resp (0x%x -> 0x%x)\n", 430 sdata->name, sta->sta.addr, 431 prev_rates, 432 sta->sta.supp_rates[band]); 433 #endif 434 rates_updated = true; 435 } 436 } else { 437 rcu_read_unlock(); 438 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 439 mgmt->sa, supp_rates, true); 440 } 441 } 442 443 if (sta && elems->wmm_info) 444 set_sta_flag(sta, WLAN_STA_WME); 445 446 if (sta && elems->ht_operation && elems->ht_cap_elem && 447 sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { 448 /* we both use HT */ 449 struct ieee80211_sta_ht_cap sta_ht_cap_new; 450 enum nl80211_channel_type channel_type = 451 ieee80211_ht_oper_to_channel_type( 452 elems->ht_operation); 453 454 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 455 elems->ht_cap_elem, 456 &sta_ht_cap_new); 457 458 /* 459 * fall back to HT20 if we don't use or use 460 * the other extension channel 461 */ 462 if (!(channel_type == NL80211_CHAN_HT40MINUS || 463 channel_type == NL80211_CHAN_HT40PLUS) || 464 channel_type != sdata->u.ibss.channel_type) 465 sta_ht_cap_new.cap &= 466 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 467 468 if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, 469 sizeof(sta_ht_cap_new))) { 470 memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, 471 sizeof(sta_ht_cap_new)); 472 rates_updated = true; 473 } 474 } 475 476 if (sta && rates_updated) 477 rate_control_rate_init(sta); 478 479 rcu_read_unlock(); 480 } 481 482 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 483 channel, beacon); 484 if (!bss) 485 return; 486 487 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 488 489 /* was just updated in ieee80211_bss_info_update */ 490 beacon_timestamp = cbss->tsf; 491 492 /* check if we need to merge IBSS */ 493 494 /* we use a fixed BSSID */ 495 if (sdata->u.ibss.fixed_bssid) 496 goto put_bss; 497 498 /* not an IBSS */ 499 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 500 goto put_bss; 501 502 /* different channel */ 503 if (cbss->channel != local->oper_channel) 504 goto put_bss; 505 506 /* different SSID */ 507 if (elems->ssid_len != sdata->u.ibss.ssid_len || 508 memcmp(elems->ssid, sdata->u.ibss.ssid, 509 sdata->u.ibss.ssid_len)) 510 goto put_bss; 511 512 /* same BSSID */ 513 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 514 goto put_bss; 515 516 if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { 517 /* 518 * For correct IBSS merging we need mactime; since mactime is 519 * defined as the time the first data symbol of the frame hits 520 * the PHY, and the timestamp of the beacon is defined as "the 521 * time that the data symbol containing the first bit of the 522 * timestamp is transmitted to the PHY plus the transmitting 523 * STA's delays through its local PHY from the MAC-PHY 524 * interface to its interface with the WM" (802.11 11.1.2) 525 * - equals the time this bit arrives at the receiver - we have 526 * to take into account the offset between the two. 527 * 528 * E.g. at 1 MBit that means mactime is 192 usec earlier 529 * (=24 bytes * 8 usecs/byte) than the beacon timestamp. 530 */ 531 int rate; 532 533 if (rx_status->flag & RX_FLAG_HT) 534 rate = 65; /* TODO: HT rates */ 535 else 536 rate = local->hw.wiphy->bands[band]-> 537 bitrates[rx_status->rate_idx].bitrate; 538 539 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); 540 } else { 541 /* 542 * second best option: get current TSF 543 * (will return -1 if not supported) 544 */ 545 rx_timestamp = drv_get_tsf(local, sdata); 546 } 547 548 #ifdef CONFIG_MAC80211_IBSS_DEBUG 549 printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" 550 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 551 mgmt->sa, mgmt->bssid, 552 (unsigned long long)rx_timestamp, 553 (unsigned long long)beacon_timestamp, 554 (unsigned long long)(rx_timestamp - beacon_timestamp), 555 jiffies); 556 #endif 557 558 if (beacon_timestamp > rx_timestamp) { 559 #ifdef CONFIG_MAC80211_IBSS_DEBUG 560 printk(KERN_DEBUG "%s: beacon TSF higher than " 561 "local TSF - IBSS merge with BSSID %pM\n", 562 sdata->name, mgmt->bssid); 563 #endif 564 ieee80211_sta_join_ibss(sdata, bss); 565 supp_rates = ieee80211_sta_get_rates(local, elems, band, NULL); 566 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 567 supp_rates, true); 568 rcu_read_unlock(); 569 } 570 571 put_bss: 572 ieee80211_rx_bss_put(local, bss); 573 } 574 575 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 576 const u8 *bssid, const u8 *addr, 577 u32 supp_rates) 578 { 579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 580 struct ieee80211_local *local = sdata->local; 581 struct sta_info *sta; 582 int band = local->hw.conf.channel->band; 583 584 /* 585 * XXX: Consider removing the least recently used entry and 586 * allow new one to be added. 587 */ 588 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 589 net_dbg_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 590 sdata->name, addr); 591 return; 592 } 593 594 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 595 return; 596 597 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 598 return; 599 600 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 601 if (!sta) 602 return; 603 604 sta->last_rx = jiffies; 605 606 /* make sure mandatory rates are always added */ 607 sta->sta.supp_rates[band] = supp_rates | 608 ieee80211_mandatory_rates(local, band); 609 610 spin_lock(&ifibss->incomplete_lock); 611 list_add(&sta->list, &ifibss->incomplete_stations); 612 spin_unlock(&ifibss->incomplete_lock); 613 ieee80211_queue_work(&local->hw, &sdata->work); 614 } 615 616 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 617 { 618 struct ieee80211_local *local = sdata->local; 619 int active = 0; 620 struct sta_info *sta; 621 622 lockdep_assert_held(&sdata->u.ibss.mtx); 623 624 rcu_read_lock(); 625 626 list_for_each_entry_rcu(sta, &local->sta_list, list) { 627 if (sta->sdata == sdata && 628 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 629 jiffies)) { 630 active++; 631 break; 632 } 633 } 634 635 rcu_read_unlock(); 636 637 return active; 638 } 639 640 /* 641 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 642 */ 643 644 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 645 { 646 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 647 648 lockdep_assert_held(&ifibss->mtx); 649 650 mod_timer(&ifibss->timer, 651 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 652 653 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); 654 655 if (time_before(jiffies, ifibss->last_scan_completed + 656 IEEE80211_IBSS_MERGE_INTERVAL)) 657 return; 658 659 if (ieee80211_sta_active_ibss(sdata)) 660 return; 661 662 if (ifibss->fixed_channel) 663 return; 664 665 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " 666 "IBSS networks with same SSID (merge)\n", sdata->name); 667 668 ieee80211_request_internal_scan(sdata, 669 ifibss->ssid, ifibss->ssid_len, NULL); 670 } 671 672 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 673 { 674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 675 u8 bssid[ETH_ALEN]; 676 u16 capability; 677 int i; 678 679 lockdep_assert_held(&ifibss->mtx); 680 681 if (ifibss->fixed_bssid) { 682 memcpy(bssid, ifibss->bssid, ETH_ALEN); 683 } else { 684 /* Generate random, not broadcast, locally administered BSSID. Mix in 685 * own MAC address to make sure that devices that do not have proper 686 * random number generator get different BSSID. */ 687 get_random_bytes(bssid, ETH_ALEN); 688 for (i = 0; i < ETH_ALEN; i++) 689 bssid[i] ^= sdata->vif.addr[i]; 690 bssid[0] &= ~0x01; 691 bssid[0] |= 0x02; 692 } 693 694 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", 695 sdata->name, bssid); 696 697 capability = WLAN_CAPABILITY_IBSS; 698 699 if (ifibss->privacy) 700 capability |= WLAN_CAPABILITY_PRIVACY; 701 else 702 sdata->drop_unencrypted = 0; 703 704 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 705 ifibss->channel, ifibss->basic_rates, 706 capability, 0); 707 } 708 709 /* 710 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 711 */ 712 713 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 714 { 715 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 716 struct ieee80211_local *local = sdata->local; 717 struct cfg80211_bss *cbss; 718 struct ieee80211_channel *chan = NULL; 719 const u8 *bssid = NULL; 720 int active_ibss; 721 u16 capability; 722 723 lockdep_assert_held(&ifibss->mtx); 724 725 active_ibss = ieee80211_sta_active_ibss(sdata); 726 #ifdef CONFIG_MAC80211_IBSS_DEBUG 727 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", 728 sdata->name, active_ibss); 729 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 730 731 if (active_ibss) 732 return; 733 734 capability = WLAN_CAPABILITY_IBSS; 735 if (ifibss->privacy) 736 capability |= WLAN_CAPABILITY_PRIVACY; 737 if (ifibss->fixed_bssid) 738 bssid = ifibss->bssid; 739 if (ifibss->fixed_channel) 740 chan = ifibss->channel; 741 if (!is_zero_ether_addr(ifibss->bssid)) 742 bssid = ifibss->bssid; 743 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 744 ifibss->ssid, ifibss->ssid_len, 745 WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY, 746 capability); 747 748 if (cbss) { 749 struct ieee80211_bss *bss; 750 751 bss = (void *)cbss->priv; 752 #ifdef CONFIG_MAC80211_IBSS_DEBUG 753 printk(KERN_DEBUG " sta_find_ibss: selected %pM current " 754 "%pM\n", cbss->bssid, ifibss->bssid); 755 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 756 757 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" 758 " based on configured SSID\n", 759 sdata->name, cbss->bssid); 760 761 ieee80211_sta_join_ibss(sdata, bss); 762 ieee80211_rx_bss_put(local, bss); 763 return; 764 } 765 766 #ifdef CONFIG_MAC80211_IBSS_DEBUG 767 printk(KERN_DEBUG " did not try to join ibss\n"); 768 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 769 770 /* Selected IBSS not found in current scan results - try to scan */ 771 if (time_after(jiffies, ifibss->last_scan_completed + 772 IEEE80211_SCAN_INTERVAL)) { 773 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " 774 "join\n", sdata->name); 775 776 ieee80211_request_internal_scan(sdata, 777 ifibss->ssid, ifibss->ssid_len, 778 ifibss->fixed_channel ? ifibss->channel : NULL); 779 } else { 780 int interval = IEEE80211_SCAN_INTERVAL; 781 782 if (time_after(jiffies, ifibss->ibss_join_req + 783 IEEE80211_IBSS_JOIN_TIMEOUT)) { 784 if (!(local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)) { 785 ieee80211_sta_create_ibss(sdata); 786 return; 787 } 788 printk(KERN_DEBUG "%s: IBSS not allowed on" 789 " %d MHz\n", sdata->name, 790 local->hw.conf.channel->center_freq); 791 792 /* No IBSS found - decrease scan interval and continue 793 * scanning. */ 794 interval = IEEE80211_SCAN_INTERVAL_SLOW; 795 } 796 797 mod_timer(&ifibss->timer, 798 round_jiffies(jiffies + interval)); 799 } 800 } 801 802 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 803 struct sk_buff *req) 804 { 805 struct ieee80211_mgmt *mgmt = (void *)req->data; 806 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 807 struct ieee80211_local *local = sdata->local; 808 int tx_last_beacon, len = req->len; 809 struct sk_buff *skb; 810 struct ieee80211_mgmt *resp; 811 struct sk_buff *presp; 812 u8 *pos, *end; 813 814 lockdep_assert_held(&ifibss->mtx); 815 816 presp = rcu_dereference_protected(ifibss->presp, 817 lockdep_is_held(&ifibss->mtx)); 818 819 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 820 len < 24 + 2 || !presp) 821 return; 822 823 tx_last_beacon = drv_tx_last_beacon(local); 824 825 #ifdef CONFIG_MAC80211_IBSS_DEBUG 826 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" 827 " (tx_last_beacon=%d)\n", 828 sdata->name, mgmt->sa, mgmt->da, 829 mgmt->bssid, tx_last_beacon); 830 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 831 832 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 833 return; 834 835 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 836 !is_broadcast_ether_addr(mgmt->bssid)) 837 return; 838 839 end = ((u8 *) mgmt) + len; 840 pos = mgmt->u.probe_req.variable; 841 if (pos[0] != WLAN_EID_SSID || 842 pos + 2 + pos[1] > end) { 843 #ifdef CONFIG_MAC80211_IBSS_DEBUG 844 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " 845 "from %pM\n", 846 sdata->name, mgmt->sa); 847 #endif 848 return; 849 } 850 if (pos[1] != 0 && 851 (pos[1] != ifibss->ssid_len || 852 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 853 /* Ignore ProbeReq for foreign SSID */ 854 return; 855 } 856 857 /* Reply with ProbeResp */ 858 skb = skb_copy(presp, GFP_KERNEL); 859 if (!skb) 860 return; 861 862 resp = (struct ieee80211_mgmt *) skb->data; 863 memcpy(resp->da, mgmt->sa, ETH_ALEN); 864 #ifdef CONFIG_MAC80211_IBSS_DEBUG 865 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", 866 sdata->name, resp->da); 867 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 868 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 869 ieee80211_tx_skb(sdata, skb); 870 } 871 872 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 873 struct ieee80211_mgmt *mgmt, 874 size_t len, 875 struct ieee80211_rx_status *rx_status) 876 { 877 size_t baselen; 878 struct ieee802_11_elems elems; 879 880 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 881 if (baselen > len) 882 return; 883 884 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 885 &elems); 886 887 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 888 } 889 890 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 891 struct ieee80211_mgmt *mgmt, 892 size_t len, 893 struct ieee80211_rx_status *rx_status) 894 { 895 size_t baselen; 896 struct ieee802_11_elems elems; 897 898 /* Process beacon from the current BSS */ 899 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 900 if (baselen > len) 901 return; 902 903 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); 904 905 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); 906 } 907 908 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 909 struct sk_buff *skb) 910 { 911 struct ieee80211_rx_status *rx_status; 912 struct ieee80211_mgmt *mgmt; 913 u16 fc; 914 915 rx_status = IEEE80211_SKB_RXCB(skb); 916 mgmt = (struct ieee80211_mgmt *) skb->data; 917 fc = le16_to_cpu(mgmt->frame_control); 918 919 mutex_lock(&sdata->u.ibss.mtx); 920 921 if (!sdata->u.ibss.ssid_len) 922 goto mgmt_out; /* not ready to merge yet */ 923 924 switch (fc & IEEE80211_FCTL_STYPE) { 925 case IEEE80211_STYPE_PROBE_REQ: 926 ieee80211_rx_mgmt_probe_req(sdata, skb); 927 break; 928 case IEEE80211_STYPE_PROBE_RESP: 929 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, 930 rx_status); 931 break; 932 case IEEE80211_STYPE_BEACON: 933 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 934 rx_status); 935 break; 936 case IEEE80211_STYPE_AUTH: 937 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 938 break; 939 } 940 941 mgmt_out: 942 mutex_unlock(&sdata->u.ibss.mtx); 943 } 944 945 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 946 { 947 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 948 struct sta_info *sta; 949 950 mutex_lock(&ifibss->mtx); 951 952 /* 953 * Work could be scheduled after scan or similar 954 * when we aren't even joined (or trying) with a 955 * network. 956 */ 957 if (!ifibss->ssid_len) 958 goto out; 959 960 spin_lock_bh(&ifibss->incomplete_lock); 961 while (!list_empty(&ifibss->incomplete_stations)) { 962 sta = list_first_entry(&ifibss->incomplete_stations, 963 struct sta_info, list); 964 list_del(&sta->list); 965 spin_unlock_bh(&ifibss->incomplete_lock); 966 967 ieee80211_ibss_finish_sta(sta, true); 968 rcu_read_unlock(); 969 spin_lock_bh(&ifibss->incomplete_lock); 970 } 971 spin_unlock_bh(&ifibss->incomplete_lock); 972 973 switch (ifibss->state) { 974 case IEEE80211_IBSS_MLME_SEARCH: 975 ieee80211_sta_find_ibss(sdata); 976 break; 977 case IEEE80211_IBSS_MLME_JOINED: 978 ieee80211_sta_merge_ibss(sdata); 979 break; 980 default: 981 WARN_ON(1); 982 break; 983 } 984 985 out: 986 mutex_unlock(&ifibss->mtx); 987 } 988 989 static void ieee80211_ibss_timer(unsigned long data) 990 { 991 struct ieee80211_sub_if_data *sdata = 992 (struct ieee80211_sub_if_data *) data; 993 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 994 struct ieee80211_local *local = sdata->local; 995 996 if (local->quiescing) { 997 ifibss->timer_running = true; 998 return; 999 } 1000 1001 ieee80211_queue_work(&local->hw, &sdata->work); 1002 } 1003 1004 #ifdef CONFIG_PM 1005 void ieee80211_ibss_quiesce(struct ieee80211_sub_if_data *sdata) 1006 { 1007 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1008 1009 if (del_timer_sync(&ifibss->timer)) 1010 ifibss->timer_running = true; 1011 } 1012 1013 void ieee80211_ibss_restart(struct ieee80211_sub_if_data *sdata) 1014 { 1015 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1016 1017 if (ifibss->timer_running) { 1018 add_timer(&ifibss->timer); 1019 ifibss->timer_running = false; 1020 } 1021 } 1022 #endif 1023 1024 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1025 { 1026 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1027 1028 setup_timer(&ifibss->timer, ieee80211_ibss_timer, 1029 (unsigned long) sdata); 1030 mutex_init(&ifibss->mtx); 1031 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1032 spin_lock_init(&ifibss->incomplete_lock); 1033 } 1034 1035 /* scan finished notification */ 1036 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1037 { 1038 struct ieee80211_sub_if_data *sdata; 1039 1040 mutex_lock(&local->iflist_mtx); 1041 list_for_each_entry(sdata, &local->interfaces, list) { 1042 if (!ieee80211_sdata_running(sdata)) 1043 continue; 1044 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1045 continue; 1046 sdata->u.ibss.last_scan_completed = jiffies; 1047 ieee80211_queue_work(&local->hw, &sdata->work); 1048 } 1049 mutex_unlock(&local->iflist_mtx); 1050 } 1051 1052 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1053 struct cfg80211_ibss_params *params) 1054 { 1055 struct sk_buff *skb; 1056 u32 changed = 0; 1057 1058 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + 1059 sizeof(struct ieee80211_hdr_3addr) + 1060 12 /* struct ieee80211_mgmt.u.beacon */ + 1061 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 1062 2 + 8 /* max Supported Rates */ + 1063 3 /* max DS params */ + 1064 4 /* IBSS params */ + 1065 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 1066 2 + sizeof(struct ieee80211_ht_cap) + 1067 2 + sizeof(struct ieee80211_ht_operation) + 1068 params->ie_len); 1069 if (!skb) 1070 return -ENOMEM; 1071 1072 mutex_lock(&sdata->u.ibss.mtx); 1073 1074 if (params->bssid) { 1075 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1076 sdata->u.ibss.fixed_bssid = true; 1077 } else 1078 sdata->u.ibss.fixed_bssid = false; 1079 1080 sdata->u.ibss.privacy = params->privacy; 1081 sdata->u.ibss.control_port = params->control_port; 1082 sdata->u.ibss.basic_rates = params->basic_rates; 1083 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1084 sizeof(params->mcast_rate)); 1085 1086 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1087 1088 sdata->u.ibss.channel = params->channel; 1089 sdata->u.ibss.channel_type = params->channel_type; 1090 sdata->u.ibss.fixed_channel = params->channel_fixed; 1091 1092 /* fix ourselves to that channel now already */ 1093 if (params->channel_fixed) { 1094 sdata->local->oper_channel = params->channel; 1095 if (!ieee80211_set_channel_type(sdata->local, sdata, 1096 params->channel_type)) { 1097 mutex_unlock(&sdata->u.ibss.mtx); 1098 kfree_skb(skb); 1099 return -EINVAL; 1100 } 1101 } 1102 1103 if (params->ie) { 1104 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1105 GFP_KERNEL); 1106 if (sdata->u.ibss.ie) 1107 sdata->u.ibss.ie_len = params->ie_len; 1108 } 1109 1110 sdata->u.ibss.skb = skb; 1111 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1112 sdata->u.ibss.ibss_join_req = jiffies; 1113 1114 memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); 1115 sdata->u.ibss.ssid_len = params->ssid_len; 1116 1117 mutex_unlock(&sdata->u.ibss.mtx); 1118 1119 mutex_lock(&sdata->local->mtx); 1120 ieee80211_recalc_idle(sdata->local); 1121 mutex_unlock(&sdata->local->mtx); 1122 1123 /* 1124 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1125 * reserved, but an HT STA shall protect HT transmissions as though 1126 * the HT Protection field were set to non-HT mixed mode. 1127 * 1128 * In an IBSS, the RIFS Mode field of the HT Operation element is 1129 * also reserved, but an HT STA shall operate as though this field 1130 * were set to 1. 1131 */ 1132 1133 sdata->vif.bss_conf.ht_operation_mode |= 1134 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1135 | IEEE80211_HT_PARAM_RIFS_MODE; 1136 1137 changed |= BSS_CHANGED_HT; 1138 ieee80211_bss_info_change_notify(sdata, changed); 1139 1140 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1141 1142 return 0; 1143 } 1144 1145 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1146 { 1147 struct sk_buff *skb; 1148 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1149 struct ieee80211_local *local = sdata->local; 1150 struct cfg80211_bss *cbss; 1151 u16 capability; 1152 int active_ibss; 1153 struct sta_info *sta; 1154 1155 mutex_lock(&sdata->u.ibss.mtx); 1156 1157 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1158 memset(sdata->u.ibss.bssid, 0, ETH_ALEN); 1159 sdata->u.ibss.ssid_len = 0; 1160 1161 active_ibss = ieee80211_sta_active_ibss(sdata); 1162 1163 if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) { 1164 capability = WLAN_CAPABILITY_IBSS; 1165 1166 if (ifibss->privacy) 1167 capability |= WLAN_CAPABILITY_PRIVACY; 1168 1169 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel, 1170 ifibss->bssid, ifibss->ssid, 1171 ifibss->ssid_len, WLAN_CAPABILITY_IBSS | 1172 WLAN_CAPABILITY_PRIVACY, 1173 capability); 1174 1175 if (cbss) { 1176 cfg80211_unlink_bss(local->hw.wiphy, cbss); 1177 cfg80211_put_bss(cbss); 1178 } 1179 } 1180 1181 sta_info_flush(sdata->local, sdata); 1182 1183 spin_lock_bh(&ifibss->incomplete_lock); 1184 while (!list_empty(&ifibss->incomplete_stations)) { 1185 sta = list_first_entry(&ifibss->incomplete_stations, 1186 struct sta_info, list); 1187 list_del(&sta->list); 1188 spin_unlock_bh(&ifibss->incomplete_lock); 1189 1190 sta_info_free(local, sta); 1191 spin_lock_bh(&ifibss->incomplete_lock); 1192 } 1193 spin_unlock_bh(&ifibss->incomplete_lock); 1194 1195 netif_carrier_off(sdata->dev); 1196 1197 /* remove beacon */ 1198 kfree(sdata->u.ibss.ie); 1199 skb = rcu_dereference_protected(sdata->u.ibss.presp, 1200 lockdep_is_held(&sdata->u.ibss.mtx)); 1201 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 1202 sdata->vif.bss_conf.ibss_joined = false; 1203 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 1204 BSS_CHANGED_IBSS); 1205 synchronize_rcu(); 1206 kfree_skb(skb); 1207 1208 skb_queue_purge(&sdata->skb_queue); 1209 1210 del_timer_sync(&sdata->u.ibss.timer); 1211 1212 mutex_unlock(&sdata->u.ibss.mtx); 1213 1214 mutex_lock(&local->mtx); 1215 ieee80211_recalc_idle(sdata->local); 1216 mutex_unlock(&local->mtx); 1217 1218 return 0; 1219 } 1220