1 /* 2 * BSS client 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 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/pm_qos_params.h> 21 #include <linux/crc32.h> 22 #include <linux/slab.h> 23 #include <net/mac80211.h> 24 #include <asm/unaligned.h> 25 26 #include "ieee80211_i.h" 27 #include "driver-ops.h" 28 #include "rate.h" 29 #include "led.h" 30 31 #define IEEE80211_MAX_PROBE_TRIES 5 32 33 /* 34 * beacon loss detection timeout 35 * XXX: should depend on beacon interval 36 */ 37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ) 38 /* 39 * Time the connection can be idle before we probe 40 * it to see if we can still talk to the AP. 41 */ 42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 43 /* 44 * Time we wait for a probe response after sending 45 * a probe request because of beacon loss or for 46 * checking the connection still works. 47 */ 48 #define IEEE80211_PROBE_WAIT (HZ / 2) 49 50 /* 51 * Weight given to the latest Beacon frame when calculating average signal 52 * strength for Beacon frames received in the current BSS. This must be 53 * between 1 and 15. 54 */ 55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 56 57 /* 58 * How many Beacon frames need to have been used in average signal strength 59 * before starting to indicate signal change events. 60 */ 61 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 62 63 #define TMR_RUNNING_TIMER 0 64 #define TMR_RUNNING_CHANSW 1 65 66 /* 67 * All cfg80211 functions have to be called outside a locked 68 * section so that they can acquire a lock themselves... This 69 * is much simpler than queuing up things in cfg80211, but we 70 * do need some indirection for that here. 71 */ 72 enum rx_mgmt_action { 73 /* no action required */ 74 RX_MGMT_NONE, 75 76 /* caller must call cfg80211_send_rx_auth() */ 77 RX_MGMT_CFG80211_AUTH, 78 79 /* caller must call cfg80211_send_rx_assoc() */ 80 RX_MGMT_CFG80211_ASSOC, 81 82 /* caller must call cfg80211_send_deauth() */ 83 RX_MGMT_CFG80211_DEAUTH, 84 85 /* caller must call cfg80211_send_disassoc() */ 86 RX_MGMT_CFG80211_DISASSOC, 87 88 /* caller must tell cfg80211 about internal error */ 89 RX_MGMT_CFG80211_ASSOC_ERROR, 90 }; 91 92 /* utils */ 93 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 94 { 95 lockdep_assert_held(&ifmgd->mtx); 96 } 97 98 /* 99 * We can have multiple work items (and connection probing) 100 * scheduling this timer, but we need to take care to only 101 * reschedule it when it should fire _earlier_ than it was 102 * asked for before, or if it's not pending right now. This 103 * function ensures that. Note that it then is required to 104 * run this function for all timeouts after the first one 105 * has happened -- the work that runs from this timer will 106 * do that. 107 */ 108 static void run_again(struct ieee80211_if_managed *ifmgd, 109 unsigned long timeout) 110 { 111 ASSERT_MGD_MTX(ifmgd); 112 113 if (!timer_pending(&ifmgd->timer) || 114 time_before(timeout, ifmgd->timer.expires)) 115 mod_timer(&ifmgd->timer, timeout); 116 } 117 118 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 119 { 120 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 121 return; 122 123 mod_timer(&sdata->u.mgd.bcn_mon_timer, 124 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME)); 125 } 126 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 128 { 129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 130 131 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 132 return; 133 134 mod_timer(&sdata->u.mgd.conn_mon_timer, 135 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 136 137 ifmgd->probe_send_count = 0; 138 } 139 140 static int ecw2cw(int ecw) 141 { 142 return (1 << ecw) - 1; 143 } 144 145 /* 146 * ieee80211_enable_ht should be called only after the operating band 147 * has been determined as ht configuration depends on the hw's 148 * HT abilities for a specific band. 149 */ 150 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 151 struct ieee80211_ht_info *hti, 152 const u8 *bssid, u16 ap_ht_cap_flags) 153 { 154 struct ieee80211_local *local = sdata->local; 155 struct ieee80211_supported_band *sband; 156 struct sta_info *sta; 157 u32 changed = 0; 158 u16 ht_opmode; 159 bool enable_ht = true; 160 enum nl80211_channel_type prev_chantype; 161 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 162 163 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 164 165 prev_chantype = sdata->vif.bss_conf.channel_type; 166 167 /* HT is not supported */ 168 if (!sband->ht_cap.ht_supported) 169 enable_ht = false; 170 171 /* check that channel matches the right operating channel */ 172 if (local->hw.conf.channel->center_freq != 173 ieee80211_channel_to_frequency(hti->control_chan)) 174 enable_ht = false; 175 176 if (enable_ht) { 177 channel_type = NL80211_CHAN_HT20; 178 179 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 180 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 181 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 182 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 183 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 184 if (!(local->hw.conf.channel->flags & 185 IEEE80211_CHAN_NO_HT40PLUS)) 186 channel_type = NL80211_CHAN_HT40PLUS; 187 break; 188 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 189 if (!(local->hw.conf.channel->flags & 190 IEEE80211_CHAN_NO_HT40MINUS)) 191 channel_type = NL80211_CHAN_HT40MINUS; 192 break; 193 } 194 } 195 } 196 197 if (local->tmp_channel) 198 local->tmp_channel_type = channel_type; 199 200 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 201 /* can only fail due to HT40+/- mismatch */ 202 channel_type = NL80211_CHAN_HT20; 203 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 204 } 205 206 /* channel_type change automatically detected */ 207 ieee80211_hw_config(local, 0); 208 209 if (prev_chantype != channel_type) { 210 rcu_read_lock(); 211 sta = sta_info_get(sdata, bssid); 212 if (sta) 213 rate_control_rate_update(local, sband, sta, 214 IEEE80211_RC_HT_CHANGED, 215 channel_type); 216 rcu_read_unlock(); 217 } 218 219 ht_opmode = le16_to_cpu(hti->operation_mode); 220 221 /* if bss configuration changed store the new one */ 222 if (sdata->ht_opmode_valid != enable_ht || 223 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 224 prev_chantype != channel_type) { 225 changed |= BSS_CHANGED_HT; 226 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 227 sdata->ht_opmode_valid = enable_ht; 228 } 229 230 return changed; 231 } 232 233 /* frame sending functions */ 234 235 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 236 const u8 *bssid, u16 stype, u16 reason, 237 void *cookie, bool send_frame) 238 { 239 struct ieee80211_local *local = sdata->local; 240 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 241 struct sk_buff *skb; 242 struct ieee80211_mgmt *mgmt; 243 244 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 245 if (!skb) { 246 printk(KERN_DEBUG "%s: failed to allocate buffer for " 247 "deauth/disassoc frame\n", sdata->name); 248 return; 249 } 250 skb_reserve(skb, local->hw.extra_tx_headroom); 251 252 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 253 memset(mgmt, 0, 24); 254 memcpy(mgmt->da, bssid, ETH_ALEN); 255 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 256 memcpy(mgmt->bssid, bssid, ETH_ALEN); 257 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 258 skb_put(skb, 2); 259 /* u.deauth.reason_code == u.disassoc.reason_code */ 260 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 261 262 if (stype == IEEE80211_STYPE_DEAUTH) 263 if (cookie) 264 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 265 else 266 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 267 else 268 if (cookie) 269 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 270 else 271 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 272 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 273 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 274 275 if (send_frame) 276 ieee80211_tx_skb(sdata, skb); 277 else 278 kfree_skb(skb); 279 } 280 281 void ieee80211_send_pspoll(struct ieee80211_local *local, 282 struct ieee80211_sub_if_data *sdata) 283 { 284 struct ieee80211_pspoll *pspoll; 285 struct sk_buff *skb; 286 287 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 288 if (!skb) 289 return; 290 291 pspoll = (struct ieee80211_pspoll *) skb->data; 292 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 293 294 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 295 ieee80211_tx_skb(sdata, skb); 296 } 297 298 void ieee80211_send_nullfunc(struct ieee80211_local *local, 299 struct ieee80211_sub_if_data *sdata, 300 int powersave) 301 { 302 struct sk_buff *skb; 303 struct ieee80211_hdr_3addr *nullfunc; 304 305 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 306 if (!skb) 307 return; 308 309 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 310 if (powersave) 311 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 312 313 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 314 ieee80211_tx_skb(sdata, skb); 315 } 316 317 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 318 struct ieee80211_sub_if_data *sdata) 319 { 320 struct sk_buff *skb; 321 struct ieee80211_hdr *nullfunc; 322 __le16 fc; 323 324 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 325 return; 326 327 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 328 if (!skb) { 329 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 330 "nullfunc frame\n", sdata->name); 331 return; 332 } 333 skb_reserve(skb, local->hw.extra_tx_headroom); 334 335 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 336 memset(nullfunc, 0, 30); 337 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 338 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 339 nullfunc->frame_control = fc; 340 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 341 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 342 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 343 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 344 345 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 346 ieee80211_tx_skb(sdata, skb); 347 } 348 349 /* spectrum management related things */ 350 static void ieee80211_chswitch_work(struct work_struct *work) 351 { 352 struct ieee80211_sub_if_data *sdata = 353 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 354 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 355 356 if (!ieee80211_sdata_running(sdata)) 357 return; 358 359 mutex_lock(&ifmgd->mtx); 360 if (!ifmgd->associated) 361 goto out; 362 363 sdata->local->oper_channel = sdata->local->csa_channel; 364 if (!sdata->local->ops->channel_switch) { 365 /* call "hw_config" only if doing sw channel switch */ 366 ieee80211_hw_config(sdata->local, 367 IEEE80211_CONF_CHANGE_CHANNEL); 368 } 369 370 /* XXX: shouldn't really modify cfg80211-owned data! */ 371 ifmgd->associated->channel = sdata->local->oper_channel; 372 373 ieee80211_wake_queues_by_reason(&sdata->local->hw, 374 IEEE80211_QUEUE_STOP_REASON_CSA); 375 out: 376 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 377 mutex_unlock(&ifmgd->mtx); 378 } 379 380 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 381 { 382 struct ieee80211_sub_if_data *sdata; 383 struct ieee80211_if_managed *ifmgd; 384 385 sdata = vif_to_sdata(vif); 386 ifmgd = &sdata->u.mgd; 387 388 trace_api_chswitch_done(sdata, success); 389 if (!success) { 390 /* 391 * If the channel switch was not successful, stay 392 * around on the old channel. We currently lack 393 * good handling of this situation, possibly we 394 * should just drop the association. 395 */ 396 sdata->local->csa_channel = sdata->local->oper_channel; 397 } 398 399 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 400 } 401 EXPORT_SYMBOL(ieee80211_chswitch_done); 402 403 static void ieee80211_chswitch_timer(unsigned long data) 404 { 405 struct ieee80211_sub_if_data *sdata = 406 (struct ieee80211_sub_if_data *) data; 407 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 408 409 if (sdata->local->quiescing) { 410 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 411 return; 412 } 413 414 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 415 } 416 417 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 418 struct ieee80211_channel_sw_ie *sw_elem, 419 struct ieee80211_bss *bss, 420 u64 timestamp) 421 { 422 struct cfg80211_bss *cbss = 423 container_of((void *)bss, struct cfg80211_bss, priv); 424 struct ieee80211_channel *new_ch; 425 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 426 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num); 427 428 ASSERT_MGD_MTX(ifmgd); 429 430 if (!ifmgd->associated) 431 return; 432 433 if (sdata->local->scanning) 434 return; 435 436 /* Disregard subsequent beacons if we are already running a timer 437 processing a CSA */ 438 439 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 440 return; 441 442 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 443 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 444 return; 445 446 sdata->local->csa_channel = new_ch; 447 448 if (sdata->local->ops->channel_switch) { 449 /* use driver's channel switch callback */ 450 struct ieee80211_channel_switch ch_switch; 451 memset(&ch_switch, 0, sizeof(ch_switch)); 452 ch_switch.timestamp = timestamp; 453 if (sw_elem->mode) { 454 ch_switch.block_tx = true; 455 ieee80211_stop_queues_by_reason(&sdata->local->hw, 456 IEEE80211_QUEUE_STOP_REASON_CSA); 457 } 458 ch_switch.channel = new_ch; 459 ch_switch.count = sw_elem->count; 460 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 461 drv_channel_switch(sdata->local, &ch_switch); 462 return; 463 } 464 465 /* channel switch handled in software */ 466 if (sw_elem->count <= 1) { 467 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 468 } else { 469 if (sw_elem->mode) 470 ieee80211_stop_queues_by_reason(&sdata->local->hw, 471 IEEE80211_QUEUE_STOP_REASON_CSA); 472 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 473 mod_timer(&ifmgd->chswitch_timer, 474 jiffies + 475 msecs_to_jiffies(sw_elem->count * 476 cbss->beacon_interval)); 477 } 478 } 479 480 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 481 u16 capab_info, u8 *pwr_constr_elem, 482 u8 pwr_constr_elem_len) 483 { 484 struct ieee80211_conf *conf = &sdata->local->hw.conf; 485 486 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 487 return; 488 489 /* Power constraint IE length should be 1 octet */ 490 if (pwr_constr_elem_len != 1) 491 return; 492 493 if ((*pwr_constr_elem <= conf->channel->max_power) && 494 (*pwr_constr_elem != sdata->local->power_constr_level)) { 495 sdata->local->power_constr_level = *pwr_constr_elem; 496 ieee80211_hw_config(sdata->local, 0); 497 } 498 } 499 500 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 501 { 502 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 503 struct ieee80211_local *local = sdata->local; 504 struct ieee80211_conf *conf = &local->hw.conf; 505 506 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 507 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 508 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 509 510 local->disable_dynamic_ps = false; 511 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 512 } 513 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 514 515 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 516 { 517 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 518 struct ieee80211_local *local = sdata->local; 519 struct ieee80211_conf *conf = &local->hw.conf; 520 521 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 522 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 523 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 524 525 local->disable_dynamic_ps = true; 526 conf->dynamic_ps_timeout = 0; 527 del_timer_sync(&local->dynamic_ps_timer); 528 ieee80211_queue_work(&local->hw, 529 &local->dynamic_ps_enable_work); 530 } 531 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 532 533 /* powersave */ 534 static void ieee80211_enable_ps(struct ieee80211_local *local, 535 struct ieee80211_sub_if_data *sdata) 536 { 537 struct ieee80211_conf *conf = &local->hw.conf; 538 539 /* 540 * If we are scanning right now then the parameters will 541 * take effect when scan finishes. 542 */ 543 if (local->scanning) 544 return; 545 546 if (conf->dynamic_ps_timeout > 0 && 547 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 548 mod_timer(&local->dynamic_ps_timer, jiffies + 549 msecs_to_jiffies(conf->dynamic_ps_timeout)); 550 } else { 551 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 552 ieee80211_send_nullfunc(local, sdata, 1); 553 554 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 555 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 556 return; 557 558 conf->flags |= IEEE80211_CONF_PS; 559 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 560 } 561 } 562 563 static void ieee80211_change_ps(struct ieee80211_local *local) 564 { 565 struct ieee80211_conf *conf = &local->hw.conf; 566 567 if (local->ps_sdata) { 568 ieee80211_enable_ps(local, local->ps_sdata); 569 } else if (conf->flags & IEEE80211_CONF_PS) { 570 conf->flags &= ~IEEE80211_CONF_PS; 571 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 572 del_timer_sync(&local->dynamic_ps_timer); 573 cancel_work_sync(&local->dynamic_ps_enable_work); 574 } 575 } 576 577 /* need to hold RTNL or interface lock */ 578 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 579 { 580 struct ieee80211_sub_if_data *sdata, *found = NULL; 581 int count = 0; 582 int timeout; 583 584 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 585 local->ps_sdata = NULL; 586 return; 587 } 588 589 if (!list_empty(&local->work_list)) { 590 local->ps_sdata = NULL; 591 goto change; 592 } 593 594 list_for_each_entry(sdata, &local->interfaces, list) { 595 if (!ieee80211_sdata_running(sdata)) 596 continue; 597 if (sdata->vif.type != NL80211_IFTYPE_STATION) 598 continue; 599 found = sdata; 600 count++; 601 } 602 603 if (count == 1 && found->u.mgd.powersave && 604 found->u.mgd.associated && 605 found->u.mgd.associated->beacon_ies && 606 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 607 IEEE80211_STA_CONNECTION_POLL))) { 608 struct ieee80211_conf *conf = &local->hw.conf; 609 s32 beaconint_us; 610 611 if (latency < 0) 612 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 613 614 beaconint_us = ieee80211_tu_to_usec( 615 found->vif.bss_conf.beacon_int); 616 617 timeout = local->dynamic_ps_forced_timeout; 618 if (timeout < 0) { 619 /* 620 * Go to full PSM if the user configures a very low 621 * latency requirement. 622 * The 2 second value is there for compatibility until 623 * the PM_QOS_NETWORK_LATENCY is configured with real 624 * values. 625 */ 626 if (latency > 1900000000 && latency != 2000000000) 627 timeout = 0; 628 else 629 timeout = 100; 630 } 631 local->dynamic_ps_user_timeout = timeout; 632 if (!local->disable_dynamic_ps) 633 conf->dynamic_ps_timeout = 634 local->dynamic_ps_user_timeout; 635 636 if (beaconint_us > latency) { 637 local->ps_sdata = NULL; 638 } else { 639 struct ieee80211_bss *bss; 640 int maxslp = 1; 641 u8 dtimper; 642 643 bss = (void *)found->u.mgd.associated->priv; 644 dtimper = bss->dtim_period; 645 646 /* If the TIM IE is invalid, pretend the value is 1 */ 647 if (!dtimper) 648 dtimper = 1; 649 else if (dtimper > 1) 650 maxslp = min_t(int, dtimper, 651 latency / beaconint_us); 652 653 local->hw.conf.max_sleep_period = maxslp; 654 local->hw.conf.ps_dtim_period = dtimper; 655 local->ps_sdata = found; 656 } 657 } else { 658 local->ps_sdata = NULL; 659 } 660 661 change: 662 ieee80211_change_ps(local); 663 } 664 665 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 666 { 667 struct ieee80211_local *local = 668 container_of(work, struct ieee80211_local, 669 dynamic_ps_disable_work); 670 671 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 672 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 673 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 674 } 675 676 ieee80211_wake_queues_by_reason(&local->hw, 677 IEEE80211_QUEUE_STOP_REASON_PS); 678 } 679 680 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 681 { 682 struct ieee80211_local *local = 683 container_of(work, struct ieee80211_local, 684 dynamic_ps_enable_work); 685 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 686 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 687 688 /* can only happen when PS was just disabled anyway */ 689 if (!sdata) 690 return; 691 692 if (local->hw.conf.flags & IEEE80211_CONF_PS) 693 return; 694 695 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 696 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) 697 ieee80211_send_nullfunc(local, sdata, 1); 698 699 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 700 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 701 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 702 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 703 local->hw.conf.flags |= IEEE80211_CONF_PS; 704 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 705 } 706 } 707 708 void ieee80211_dynamic_ps_timer(unsigned long data) 709 { 710 struct ieee80211_local *local = (void *) data; 711 712 if (local->quiescing || local->suspended) 713 return; 714 715 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 716 } 717 718 /* MLME */ 719 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 720 struct ieee80211_sub_if_data *sdata, 721 u8 *wmm_param, size_t wmm_param_len) 722 { 723 struct ieee80211_tx_queue_params params; 724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 725 size_t left; 726 int count; 727 u8 *pos, uapsd_queues = 0; 728 729 if (!local->ops->conf_tx) 730 return; 731 732 if (local->hw.queues < 4) 733 return; 734 735 if (!wmm_param) 736 return; 737 738 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 739 return; 740 741 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 742 uapsd_queues = local->uapsd_queues; 743 744 count = wmm_param[6] & 0x0f; 745 if (count == ifmgd->wmm_last_param_set) 746 return; 747 ifmgd->wmm_last_param_set = count; 748 749 pos = wmm_param + 8; 750 left = wmm_param_len - 8; 751 752 memset(¶ms, 0, sizeof(params)); 753 754 local->wmm_acm = 0; 755 for (; left >= 4; left -= 4, pos += 4) { 756 int aci = (pos[0] >> 5) & 0x03; 757 int acm = (pos[0] >> 4) & 0x01; 758 bool uapsd = false; 759 int queue; 760 761 switch (aci) { 762 case 1: /* AC_BK */ 763 queue = 3; 764 if (acm) 765 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 766 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 767 uapsd = true; 768 break; 769 case 2: /* AC_VI */ 770 queue = 1; 771 if (acm) 772 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 774 uapsd = true; 775 break; 776 case 3: /* AC_VO */ 777 queue = 0; 778 if (acm) 779 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 781 uapsd = true; 782 break; 783 case 0: /* AC_BE */ 784 default: 785 queue = 2; 786 if (acm) 787 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 788 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 789 uapsd = true; 790 break; 791 } 792 793 params.aifs = pos[0] & 0x0f; 794 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 795 params.cw_min = ecw2cw(pos[1] & 0x0f); 796 params.txop = get_unaligned_le16(pos + 2); 797 params.uapsd = uapsd; 798 799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 800 wiphy_debug(local->hw.wiphy, 801 "WMM queue=%d aci=%d acm=%d aifs=%d " 802 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 803 queue, aci, acm, 804 params.aifs, params.cw_min, params.cw_max, 805 params.txop, params.uapsd); 806 #endif 807 if (drv_conf_tx(local, queue, ¶ms)) 808 wiphy_debug(local->hw.wiphy, 809 "failed to set TX queue parameters for queue %d\n", 810 queue); 811 } 812 813 /* enable WMM or activate new settings */ 814 sdata->vif.bss_conf.qos = true; 815 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 816 } 817 818 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 819 u16 capab, bool erp_valid, u8 erp) 820 { 821 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 822 u32 changed = 0; 823 bool use_protection; 824 bool use_short_preamble; 825 bool use_short_slot; 826 827 if (erp_valid) { 828 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 829 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 830 } else { 831 use_protection = false; 832 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 833 } 834 835 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 836 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 837 use_short_slot = true; 838 839 if (use_protection != bss_conf->use_cts_prot) { 840 bss_conf->use_cts_prot = use_protection; 841 changed |= BSS_CHANGED_ERP_CTS_PROT; 842 } 843 844 if (use_short_preamble != bss_conf->use_short_preamble) { 845 bss_conf->use_short_preamble = use_short_preamble; 846 changed |= BSS_CHANGED_ERP_PREAMBLE; 847 } 848 849 if (use_short_slot != bss_conf->use_short_slot) { 850 bss_conf->use_short_slot = use_short_slot; 851 changed |= BSS_CHANGED_ERP_SLOT; 852 } 853 854 return changed; 855 } 856 857 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 858 struct cfg80211_bss *cbss, 859 u32 bss_info_changed) 860 { 861 struct ieee80211_bss *bss = (void *)cbss->priv; 862 struct ieee80211_local *local = sdata->local; 863 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 864 865 bss_info_changed |= BSS_CHANGED_ASSOC; 866 /* set timing information */ 867 bss_conf->beacon_int = cbss->beacon_interval; 868 bss_conf->timestamp = cbss->tsf; 869 870 bss_info_changed |= BSS_CHANGED_BEACON_INT; 871 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 872 cbss->capability, bss->has_erp_value, bss->erp_value); 873 874 sdata->u.mgd.associated = cbss; 875 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 876 877 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 878 879 /* just to be sure */ 880 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 881 IEEE80211_STA_BEACON_POLL); 882 883 ieee80211_led_assoc(local, 1); 884 885 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 886 bss_conf->dtim_period = bss->dtim_period; 887 else 888 bss_conf->dtim_period = 0; 889 890 bss_conf->assoc = 1; 891 /* 892 * For now just always ask the driver to update the basic rateset 893 * when we have associated, we aren't checking whether it actually 894 * changed or not. 895 */ 896 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 897 898 /* And the BSSID changed - we're associated now */ 899 bss_info_changed |= BSS_CHANGED_BSSID; 900 901 /* Tell the driver to monitor connection quality (if supported) */ 902 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 903 bss_conf->cqm_rssi_thold) 904 bss_info_changed |= BSS_CHANGED_CQM; 905 906 /* Enable ARP filtering */ 907 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 908 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 909 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 910 } 911 912 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 913 914 mutex_lock(&local->iflist_mtx); 915 ieee80211_recalc_ps(local, -1); 916 ieee80211_recalc_smps(local); 917 mutex_unlock(&local->iflist_mtx); 918 919 netif_tx_start_all_queues(sdata->dev); 920 netif_carrier_on(sdata->dev); 921 } 922 923 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 924 bool remove_sta, bool tx) 925 { 926 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 927 struct ieee80211_local *local = sdata->local; 928 struct sta_info *sta; 929 u32 changed = 0, config_changed = 0; 930 u8 bssid[ETH_ALEN]; 931 932 ASSERT_MGD_MTX(ifmgd); 933 934 if (WARN_ON(!ifmgd->associated)) 935 return; 936 937 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 938 939 ifmgd->associated = NULL; 940 memset(ifmgd->bssid, 0, ETH_ALEN); 941 942 /* 943 * we need to commit the associated = NULL change because the 944 * scan code uses that to determine whether this iface should 945 * go to/wake up from powersave or not -- and could otherwise 946 * wake the queues erroneously. 947 */ 948 smp_mb(); 949 950 /* 951 * Thus, we can only afterwards stop the queues -- to account 952 * for the case where another CPU is finishing a scan at this 953 * time -- we don't want the scan code to enable queues. 954 */ 955 956 netif_tx_stop_all_queues(sdata->dev); 957 netif_carrier_off(sdata->dev); 958 959 mutex_lock(&local->sta_mtx); 960 sta = sta_info_get(sdata, bssid); 961 if (sta) { 962 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 963 ieee80211_sta_tear_down_BA_sessions(sta, tx); 964 } 965 mutex_unlock(&local->sta_mtx); 966 967 changed |= ieee80211_reset_erp_info(sdata); 968 969 ieee80211_led_assoc(local, 0); 970 changed |= BSS_CHANGED_ASSOC; 971 sdata->vif.bss_conf.assoc = false; 972 973 ieee80211_set_wmm_default(sdata); 974 975 /* channel(_type) changes are handled by ieee80211_hw_config */ 976 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 977 978 /* on the next assoc, re-program HT parameters */ 979 sdata->ht_opmode_valid = false; 980 981 local->power_constr_level = 0; 982 983 del_timer_sync(&local->dynamic_ps_timer); 984 cancel_work_sync(&local->dynamic_ps_enable_work); 985 986 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 987 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 988 config_changed |= IEEE80211_CONF_CHANGE_PS; 989 } 990 991 ieee80211_hw_config(local, config_changed); 992 993 /* Disable ARP filtering */ 994 if (sdata->vif.bss_conf.arp_filter_enabled) { 995 sdata->vif.bss_conf.arp_filter_enabled = false; 996 changed |= BSS_CHANGED_ARP_FILTER; 997 } 998 999 /* The BSSID (not really interesting) and HT changed */ 1000 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1001 ieee80211_bss_info_change_notify(sdata, changed); 1002 1003 if (remove_sta) 1004 sta_info_destroy_addr(sdata, bssid); 1005 1006 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1007 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1008 del_timer_sync(&sdata->u.mgd.timer); 1009 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1010 } 1011 1012 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1013 struct ieee80211_hdr *hdr) 1014 { 1015 /* 1016 * We can postpone the mgd.timer whenever receiving unicast frames 1017 * from AP because we know that the connection is working both ways 1018 * at that time. But multicast frames (and hence also beacons) must 1019 * be ignored here, because we need to trigger the timer during 1020 * data idle periods for sending the periodic probe request to the 1021 * AP we're connected to. 1022 */ 1023 if (is_multicast_ether_addr(hdr->addr1)) 1024 return; 1025 1026 ieee80211_sta_reset_conn_monitor(sdata); 1027 } 1028 1029 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1030 { 1031 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1032 const u8 *ssid; 1033 u8 *dst = ifmgd->associated->bssid; 1034 u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3); 1035 1036 /* 1037 * Try sending broadcast probe requests for the last three 1038 * probe requests after the first ones failed since some 1039 * buggy APs only support broadcast probe requests. 1040 */ 1041 if (ifmgd->probe_send_count >= unicast_limit) 1042 dst = NULL; 1043 1044 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1045 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1046 1047 ifmgd->probe_send_count++; 1048 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT; 1049 run_again(ifmgd, ifmgd->probe_timeout); 1050 } 1051 1052 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1053 bool beacon) 1054 { 1055 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1056 bool already = false; 1057 1058 if (!ieee80211_sdata_running(sdata)) 1059 return; 1060 1061 if (sdata->local->scanning) 1062 return; 1063 1064 if (sdata->local->tmp_channel) 1065 return; 1066 1067 mutex_lock(&ifmgd->mtx); 1068 1069 if (!ifmgd->associated) 1070 goto out; 1071 1072 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1073 if (beacon && net_ratelimit()) 1074 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1075 "- sending probe request\n", sdata->name); 1076 #endif 1077 1078 /* 1079 * The driver/our work has already reported this event or the 1080 * connection monitoring has kicked in and we have already sent 1081 * a probe request. Or maybe the AP died and the driver keeps 1082 * reporting until we disassociate... 1083 * 1084 * In either case we have to ignore the current call to this 1085 * function (except for setting the correct probe reason bit) 1086 * because otherwise we would reset the timer every time and 1087 * never check whether we received a probe response! 1088 */ 1089 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1090 IEEE80211_STA_CONNECTION_POLL)) 1091 already = true; 1092 1093 if (beacon) 1094 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1095 else 1096 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1097 1098 if (already) 1099 goto out; 1100 1101 mutex_lock(&sdata->local->iflist_mtx); 1102 ieee80211_recalc_ps(sdata->local, -1); 1103 mutex_unlock(&sdata->local->iflist_mtx); 1104 1105 ifmgd->probe_send_count = 0; 1106 ieee80211_mgd_probe_ap_send(sdata); 1107 out: 1108 mutex_unlock(&ifmgd->mtx); 1109 } 1110 1111 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1112 { 1113 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1114 struct ieee80211_local *local = sdata->local; 1115 u8 bssid[ETH_ALEN]; 1116 1117 mutex_lock(&ifmgd->mtx); 1118 if (!ifmgd->associated) { 1119 mutex_unlock(&ifmgd->mtx); 1120 return; 1121 } 1122 1123 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1124 1125 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid); 1126 1127 ieee80211_set_disassoc(sdata, true, true); 1128 mutex_unlock(&ifmgd->mtx); 1129 1130 mutex_lock(&local->mtx); 1131 ieee80211_recalc_idle(local); 1132 mutex_unlock(&local->mtx); 1133 /* 1134 * must be outside lock due to cfg80211, 1135 * but that's not a problem. 1136 */ 1137 ieee80211_send_deauth_disassoc(sdata, bssid, 1138 IEEE80211_STYPE_DEAUTH, 1139 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1140 NULL, true); 1141 } 1142 1143 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1144 { 1145 struct ieee80211_sub_if_data *sdata = 1146 container_of(work, struct ieee80211_sub_if_data, 1147 u.mgd.beacon_connection_loss_work); 1148 1149 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1150 __ieee80211_connection_loss(sdata); 1151 else 1152 ieee80211_mgd_probe_ap(sdata, true); 1153 } 1154 1155 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1156 { 1157 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1158 struct ieee80211_hw *hw = &sdata->local->hw; 1159 1160 trace_api_beacon_loss(sdata); 1161 1162 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1163 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1164 } 1165 EXPORT_SYMBOL(ieee80211_beacon_loss); 1166 1167 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1168 { 1169 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1170 struct ieee80211_hw *hw = &sdata->local->hw; 1171 1172 trace_api_connection_loss(sdata); 1173 1174 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1175 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1176 } 1177 EXPORT_SYMBOL(ieee80211_connection_loss); 1178 1179 1180 static enum rx_mgmt_action __must_check 1181 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1182 struct ieee80211_mgmt *mgmt, size_t len) 1183 { 1184 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1185 const u8 *bssid = NULL; 1186 u16 reason_code; 1187 1188 if (len < 24 + 2) 1189 return RX_MGMT_NONE; 1190 1191 ASSERT_MGD_MTX(ifmgd); 1192 1193 bssid = ifmgd->associated->bssid; 1194 1195 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1196 1197 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1198 sdata->name, bssid, reason_code); 1199 1200 ieee80211_set_disassoc(sdata, true, false); 1201 mutex_lock(&sdata->local->mtx); 1202 ieee80211_recalc_idle(sdata->local); 1203 mutex_unlock(&sdata->local->mtx); 1204 1205 return RX_MGMT_CFG80211_DEAUTH; 1206 } 1207 1208 1209 static enum rx_mgmt_action __must_check 1210 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1211 struct ieee80211_mgmt *mgmt, size_t len) 1212 { 1213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1214 u16 reason_code; 1215 1216 if (len < 24 + 2) 1217 return RX_MGMT_NONE; 1218 1219 ASSERT_MGD_MTX(ifmgd); 1220 1221 if (WARN_ON(!ifmgd->associated)) 1222 return RX_MGMT_NONE; 1223 1224 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1225 return RX_MGMT_NONE; 1226 1227 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1228 1229 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1230 sdata->name, mgmt->sa, reason_code); 1231 1232 ieee80211_set_disassoc(sdata, true, false); 1233 mutex_lock(&sdata->local->mtx); 1234 ieee80211_recalc_idle(sdata->local); 1235 mutex_unlock(&sdata->local->mtx); 1236 return RX_MGMT_CFG80211_DISASSOC; 1237 } 1238 1239 1240 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1241 struct ieee80211_mgmt *mgmt, size_t len) 1242 { 1243 struct ieee80211_sub_if_data *sdata = wk->sdata; 1244 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1245 struct ieee80211_local *local = sdata->local; 1246 struct ieee80211_supported_band *sband; 1247 struct sta_info *sta; 1248 struct cfg80211_bss *cbss = wk->assoc.bss; 1249 u8 *pos; 1250 u32 rates, basic_rates; 1251 u16 capab_info, aid; 1252 struct ieee802_11_elems elems; 1253 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1254 u32 changed = 0; 1255 int i, j, err; 1256 bool have_higher_than_11mbit = false; 1257 u16 ap_ht_cap_flags; 1258 1259 /* AssocResp and ReassocResp have identical structure */ 1260 1261 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1262 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1263 1264 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1265 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1266 "set\n", sdata->name, aid); 1267 aid &= ~(BIT(15) | BIT(14)); 1268 1269 pos = mgmt->u.assoc_resp.variable; 1270 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1271 1272 if (!elems.supp_rates) { 1273 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1274 sdata->name); 1275 return false; 1276 } 1277 1278 ifmgd->aid = aid; 1279 1280 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1281 if (!sta) { 1282 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1283 " the AP\n", sdata->name); 1284 return false; 1285 } 1286 1287 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1288 WLAN_STA_ASSOC_AP); 1289 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1290 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1291 1292 rates = 0; 1293 basic_rates = 0; 1294 sband = local->hw.wiphy->bands[wk->chan->band]; 1295 1296 for (i = 0; i < elems.supp_rates_len; i++) { 1297 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1298 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1299 1300 if (rate > 110) 1301 have_higher_than_11mbit = true; 1302 1303 for (j = 0; j < sband->n_bitrates; j++) { 1304 if (sband->bitrates[j].bitrate == rate) { 1305 rates |= BIT(j); 1306 if (is_basic) 1307 basic_rates |= BIT(j); 1308 break; 1309 } 1310 } 1311 } 1312 1313 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1314 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1315 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1316 1317 if (rate > 110) 1318 have_higher_than_11mbit = true; 1319 1320 for (j = 0; j < sband->n_bitrates; j++) { 1321 if (sband->bitrates[j].bitrate == rate) { 1322 rates |= BIT(j); 1323 if (is_basic) 1324 basic_rates |= BIT(j); 1325 break; 1326 } 1327 } 1328 } 1329 1330 sta->sta.supp_rates[wk->chan->band] = rates; 1331 sdata->vif.bss_conf.basic_rates = basic_rates; 1332 1333 /* cf. IEEE 802.11 9.2.12 */ 1334 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1335 have_higher_than_11mbit) 1336 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1337 else 1338 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1339 1340 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1341 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1342 elems.ht_cap_elem, &sta->sta.ht_cap); 1343 1344 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1345 1346 rate_control_rate_init(sta); 1347 1348 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1349 set_sta_flags(sta, WLAN_STA_MFP); 1350 1351 if (elems.wmm_param) 1352 set_sta_flags(sta, WLAN_STA_WME); 1353 1354 err = sta_info_insert(sta); 1355 sta = NULL; 1356 if (err) { 1357 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1358 " the AP (error %d)\n", sdata->name, err); 1359 return false; 1360 } 1361 1362 /* 1363 * Always handle WMM once after association regardless 1364 * of the first value the AP uses. Setting -1 here has 1365 * that effect because the AP values is an unsigned 1366 * 4-bit value. 1367 */ 1368 ifmgd->wmm_last_param_set = -1; 1369 1370 if (elems.wmm_param) 1371 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1372 elems.wmm_param_len); 1373 else 1374 ieee80211_set_wmm_default(sdata); 1375 1376 local->oper_channel = wk->chan; 1377 1378 if (elems.ht_info_elem && elems.wmm_param && 1379 (sdata->local->hw.queues >= 4) && 1380 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1381 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1382 cbss->bssid, ap_ht_cap_flags); 1383 1384 /* set AID and assoc capability, 1385 * ieee80211_set_associated() will tell the driver */ 1386 bss_conf->aid = aid; 1387 bss_conf->assoc_capability = capab_info; 1388 ieee80211_set_associated(sdata, cbss, changed); 1389 1390 /* 1391 * If we're using 4-addr mode, let the AP know that we're 1392 * doing so, so that it can create the STA VLAN on its side 1393 */ 1394 if (ifmgd->use_4addr) 1395 ieee80211_send_4addr_nullfunc(local, sdata); 1396 1397 /* 1398 * Start timer to probe the connection to the AP now. 1399 * Also start the timer that will detect beacon loss. 1400 */ 1401 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1402 ieee80211_sta_reset_beacon_monitor(sdata); 1403 1404 return true; 1405 } 1406 1407 1408 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1409 struct ieee80211_mgmt *mgmt, 1410 size_t len, 1411 struct ieee80211_rx_status *rx_status, 1412 struct ieee802_11_elems *elems, 1413 bool beacon) 1414 { 1415 struct ieee80211_local *local = sdata->local; 1416 int freq; 1417 struct ieee80211_bss *bss; 1418 struct ieee80211_channel *channel; 1419 bool need_ps = false; 1420 1421 if (sdata->u.mgd.associated) { 1422 bss = (void *)sdata->u.mgd.associated->priv; 1423 /* not previously set so we may need to recalc */ 1424 need_ps = !bss->dtim_period; 1425 } 1426 1427 if (elems->ds_params && elems->ds_params_len == 1) 1428 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1429 else 1430 freq = rx_status->freq; 1431 1432 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1433 1434 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1435 return; 1436 1437 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1438 channel, beacon); 1439 if (bss) 1440 ieee80211_rx_bss_put(local, bss); 1441 1442 if (!sdata->u.mgd.associated) 1443 return; 1444 1445 if (need_ps) { 1446 mutex_lock(&local->iflist_mtx); 1447 ieee80211_recalc_ps(local, -1); 1448 mutex_unlock(&local->iflist_mtx); 1449 } 1450 1451 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1452 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1453 ETH_ALEN) == 0)) { 1454 struct ieee80211_channel_sw_ie *sw_elem = 1455 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1456 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1457 bss, rx_status->mactime); 1458 } 1459 } 1460 1461 1462 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1463 struct sk_buff *skb) 1464 { 1465 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1466 struct ieee80211_if_managed *ifmgd; 1467 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1468 size_t baselen, len = skb->len; 1469 struct ieee802_11_elems elems; 1470 1471 ifmgd = &sdata->u.mgd; 1472 1473 ASSERT_MGD_MTX(ifmgd); 1474 1475 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1476 return; /* ignore ProbeResp to foreign address */ 1477 1478 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1479 if (baselen > len) 1480 return; 1481 1482 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1483 &elems); 1484 1485 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1486 1487 if (ifmgd->associated && 1488 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 && 1489 ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1490 IEEE80211_STA_CONNECTION_POLL)) { 1491 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1492 IEEE80211_STA_BEACON_POLL); 1493 mutex_lock(&sdata->local->iflist_mtx); 1494 ieee80211_recalc_ps(sdata->local, -1); 1495 mutex_unlock(&sdata->local->iflist_mtx); 1496 1497 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1498 return; 1499 1500 /* 1501 * We've received a probe response, but are not sure whether 1502 * we have or will be receiving any beacons or data, so let's 1503 * schedule the timers again, just in case. 1504 */ 1505 ieee80211_sta_reset_beacon_monitor(sdata); 1506 1507 mod_timer(&ifmgd->conn_mon_timer, 1508 round_jiffies_up(jiffies + 1509 IEEE80211_CONNECTION_IDLE_TIME)); 1510 } 1511 } 1512 1513 /* 1514 * This is the canonical list of information elements we care about, 1515 * the filter code also gives us all changes to the Microsoft OUI 1516 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1517 * 1518 * We implement beacon filtering in software since that means we can 1519 * avoid processing the frame here and in cfg80211, and userspace 1520 * will not be able to tell whether the hardware supports it or not. 1521 * 1522 * XXX: This list needs to be dynamic -- userspace needs to be able to 1523 * add items it requires. It also needs to be able to tell us to 1524 * look out for other vendor IEs. 1525 */ 1526 static const u64 care_about_ies = 1527 (1ULL << WLAN_EID_COUNTRY) | 1528 (1ULL << WLAN_EID_ERP_INFO) | 1529 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1530 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1531 (1ULL << WLAN_EID_HT_CAPABILITY) | 1532 (1ULL << WLAN_EID_HT_INFORMATION); 1533 1534 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1535 struct ieee80211_mgmt *mgmt, 1536 size_t len, 1537 struct ieee80211_rx_status *rx_status) 1538 { 1539 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1540 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1541 size_t baselen; 1542 struct ieee802_11_elems elems; 1543 struct ieee80211_local *local = sdata->local; 1544 u32 changed = 0; 1545 bool erp_valid, directed_tim = false; 1546 u8 erp_value = 0; 1547 u32 ncrc; 1548 u8 *bssid; 1549 1550 ASSERT_MGD_MTX(ifmgd); 1551 1552 /* Process beacon from the current BSS */ 1553 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1554 if (baselen > len) 1555 return; 1556 1557 if (rx_status->freq != local->hw.conf.channel->center_freq) 1558 return; 1559 1560 /* 1561 * We might have received a number of frames, among them a 1562 * disassoc frame and a beacon... 1563 */ 1564 if (!ifmgd->associated) 1565 return; 1566 1567 bssid = ifmgd->associated->bssid; 1568 1569 /* 1570 * And in theory even frames from a different AP we were just 1571 * associated to a split-second ago! 1572 */ 1573 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1574 return; 1575 1576 /* Track average RSSI from the Beacon frames of the current AP */ 1577 ifmgd->last_beacon_signal = rx_status->signal; 1578 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1579 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1580 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1581 ifmgd->last_cqm_event_signal = 0; 1582 ifmgd->count_beacon_signal = 1; 1583 } else { 1584 ifmgd->ave_beacon_signal = 1585 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1586 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1587 ifmgd->ave_beacon_signal) / 16; 1588 ifmgd->count_beacon_signal++; 1589 } 1590 if (bss_conf->cqm_rssi_thold && 1591 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1592 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1593 int sig = ifmgd->ave_beacon_signal / 16; 1594 int last_event = ifmgd->last_cqm_event_signal; 1595 int thold = bss_conf->cqm_rssi_thold; 1596 int hyst = bss_conf->cqm_rssi_hyst; 1597 if (sig < thold && 1598 (last_event == 0 || sig < last_event - hyst)) { 1599 ifmgd->last_cqm_event_signal = sig; 1600 ieee80211_cqm_rssi_notify( 1601 &sdata->vif, 1602 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1603 GFP_KERNEL); 1604 } else if (sig > thold && 1605 (last_event == 0 || sig > last_event + hyst)) { 1606 ifmgd->last_cqm_event_signal = sig; 1607 ieee80211_cqm_rssi_notify( 1608 &sdata->vif, 1609 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1610 GFP_KERNEL); 1611 } 1612 } 1613 1614 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1615 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1616 if (net_ratelimit()) { 1617 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1618 "to a received beacon\n", sdata->name); 1619 } 1620 #endif 1621 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1622 mutex_lock(&local->iflist_mtx); 1623 ieee80211_recalc_ps(local, -1); 1624 mutex_unlock(&local->iflist_mtx); 1625 } 1626 1627 /* 1628 * Push the beacon loss detection into the future since 1629 * we are processing a beacon from the AP just now. 1630 */ 1631 ieee80211_sta_reset_beacon_monitor(sdata); 1632 1633 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1634 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1635 len - baselen, &elems, 1636 care_about_ies, ncrc); 1637 1638 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1639 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1640 ifmgd->aid); 1641 1642 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1643 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1644 true); 1645 1646 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1647 elems.wmm_param_len); 1648 } 1649 1650 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1651 if (directed_tim) { 1652 if (local->hw.conf.dynamic_ps_timeout > 0) { 1653 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1654 ieee80211_hw_config(local, 1655 IEEE80211_CONF_CHANGE_PS); 1656 ieee80211_send_nullfunc(local, sdata, 0); 1657 } else { 1658 local->pspolling = true; 1659 1660 /* 1661 * Here is assumed that the driver will be 1662 * able to send ps-poll frame and receive a 1663 * response even though power save mode is 1664 * enabled, but some drivers might require 1665 * to disable power save here. This needs 1666 * to be investigated. 1667 */ 1668 ieee80211_send_pspoll(local, sdata); 1669 } 1670 } 1671 } 1672 1673 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1674 return; 1675 ifmgd->beacon_crc = ncrc; 1676 ifmgd->beacon_crc_valid = true; 1677 1678 if (elems.erp_info && elems.erp_info_len >= 1) { 1679 erp_valid = true; 1680 erp_value = elems.erp_info[0]; 1681 } else { 1682 erp_valid = false; 1683 } 1684 changed |= ieee80211_handle_bss_capability(sdata, 1685 le16_to_cpu(mgmt->u.beacon.capab_info), 1686 erp_valid, erp_value); 1687 1688 1689 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1690 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1691 struct sta_info *sta; 1692 struct ieee80211_supported_band *sband; 1693 u16 ap_ht_cap_flags; 1694 1695 rcu_read_lock(); 1696 1697 sta = sta_info_get(sdata, bssid); 1698 if (WARN_ON(!sta)) { 1699 rcu_read_unlock(); 1700 return; 1701 } 1702 1703 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1704 1705 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1706 elems.ht_cap_elem, &sta->sta.ht_cap); 1707 1708 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1709 1710 rcu_read_unlock(); 1711 1712 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1713 bssid, ap_ht_cap_flags); 1714 } 1715 1716 /* Note: country IE parsing is done for us by cfg80211 */ 1717 if (elems.country_elem) { 1718 /* TODO: IBSS also needs this */ 1719 if (elems.pwr_constr_elem) 1720 ieee80211_handle_pwr_constr(sdata, 1721 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1722 elems.pwr_constr_elem, 1723 elems.pwr_constr_elem_len); 1724 } 1725 1726 ieee80211_bss_info_change_notify(sdata, changed); 1727 } 1728 1729 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1730 struct sk_buff *skb) 1731 { 1732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1733 struct ieee80211_rx_status *rx_status; 1734 struct ieee80211_mgmt *mgmt; 1735 enum rx_mgmt_action rma = RX_MGMT_NONE; 1736 u16 fc; 1737 1738 rx_status = (struct ieee80211_rx_status *) skb->cb; 1739 mgmt = (struct ieee80211_mgmt *) skb->data; 1740 fc = le16_to_cpu(mgmt->frame_control); 1741 1742 mutex_lock(&ifmgd->mtx); 1743 1744 if (ifmgd->associated && 1745 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1746 switch (fc & IEEE80211_FCTL_STYPE) { 1747 case IEEE80211_STYPE_BEACON: 1748 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1749 rx_status); 1750 break; 1751 case IEEE80211_STYPE_PROBE_RESP: 1752 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1753 break; 1754 case IEEE80211_STYPE_DEAUTH: 1755 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1756 break; 1757 case IEEE80211_STYPE_DISASSOC: 1758 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1759 break; 1760 case IEEE80211_STYPE_ACTION: 1761 switch (mgmt->u.action.category) { 1762 case WLAN_CATEGORY_SPECTRUM_MGMT: 1763 ieee80211_sta_process_chanswitch(sdata, 1764 &mgmt->u.action.u.chan_switch.sw_elem, 1765 (void *)ifmgd->associated->priv, 1766 rx_status->mactime); 1767 break; 1768 } 1769 } 1770 mutex_unlock(&ifmgd->mtx); 1771 1772 switch (rma) { 1773 case RX_MGMT_NONE: 1774 /* no action */ 1775 break; 1776 case RX_MGMT_CFG80211_DEAUTH: 1777 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1778 break; 1779 case RX_MGMT_CFG80211_DISASSOC: 1780 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1781 break; 1782 default: 1783 WARN(1, "unexpected: %d", rma); 1784 } 1785 return; 1786 } 1787 1788 mutex_unlock(&ifmgd->mtx); 1789 1790 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1791 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1792 struct ieee80211_local *local = sdata->local; 1793 struct ieee80211_work *wk; 1794 1795 mutex_lock(&local->mtx); 1796 list_for_each_entry(wk, &local->work_list, list) { 1797 if (wk->sdata != sdata) 1798 continue; 1799 1800 if (wk->type != IEEE80211_WORK_ASSOC && 1801 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1802 continue; 1803 1804 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1805 continue; 1806 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1807 continue; 1808 1809 /* 1810 * Printing the message only here means we can't 1811 * spuriously print it, but it also means that it 1812 * won't be printed when the frame comes in before 1813 * we even tried to associate or in similar cases. 1814 * 1815 * Ultimately, I suspect cfg80211 should print the 1816 * messages instead. 1817 */ 1818 printk(KERN_DEBUG 1819 "%s: deauthenticated from %pM (Reason: %u)\n", 1820 sdata->name, mgmt->bssid, 1821 le16_to_cpu(mgmt->u.deauth.reason_code)); 1822 1823 list_del_rcu(&wk->list); 1824 free_work(wk); 1825 break; 1826 } 1827 mutex_unlock(&local->mtx); 1828 1829 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1830 } 1831 } 1832 1833 static void ieee80211_sta_timer(unsigned long data) 1834 { 1835 struct ieee80211_sub_if_data *sdata = 1836 (struct ieee80211_sub_if_data *) data; 1837 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1838 struct ieee80211_local *local = sdata->local; 1839 1840 if (local->quiescing) { 1841 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1842 return; 1843 } 1844 1845 ieee80211_queue_work(&local->hw, &sdata->work); 1846 } 1847 1848 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 1849 { 1850 struct ieee80211_local *local = sdata->local; 1851 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1852 1853 /* then process the rest of the work */ 1854 mutex_lock(&ifmgd->mtx); 1855 1856 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1857 IEEE80211_STA_CONNECTION_POLL) && 1858 ifmgd->associated) { 1859 u8 bssid[ETH_ALEN]; 1860 1861 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1862 if (time_is_after_jiffies(ifmgd->probe_timeout)) 1863 run_again(ifmgd, ifmgd->probe_timeout); 1864 1865 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) { 1866 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1867 wiphy_debug(local->hw.wiphy, 1868 "%s: No probe response from AP %pM" 1869 " after %dms, try %d\n", 1870 sdata->name, 1871 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ, 1872 ifmgd->probe_send_count); 1873 #endif 1874 ieee80211_mgd_probe_ap_send(sdata); 1875 } else { 1876 /* 1877 * We actually lost the connection ... or did we? 1878 * Let's make sure! 1879 */ 1880 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1881 IEEE80211_STA_BEACON_POLL); 1882 wiphy_debug(local->hw.wiphy, 1883 "%s: No probe response from AP %pM" 1884 " after %dms, disconnecting.\n", 1885 sdata->name, 1886 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 1887 ieee80211_set_disassoc(sdata, true, true); 1888 mutex_unlock(&ifmgd->mtx); 1889 mutex_lock(&local->mtx); 1890 ieee80211_recalc_idle(local); 1891 mutex_unlock(&local->mtx); 1892 /* 1893 * must be outside lock due to cfg80211, 1894 * but that's not a problem. 1895 */ 1896 ieee80211_send_deauth_disassoc(sdata, bssid, 1897 IEEE80211_STYPE_DEAUTH, 1898 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1899 NULL, true); 1900 mutex_lock(&ifmgd->mtx); 1901 } 1902 } 1903 1904 mutex_unlock(&ifmgd->mtx); 1905 } 1906 1907 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 1908 { 1909 struct ieee80211_sub_if_data *sdata = 1910 (struct ieee80211_sub_if_data *) data; 1911 struct ieee80211_local *local = sdata->local; 1912 1913 if (local->quiescing) 1914 return; 1915 1916 ieee80211_queue_work(&sdata->local->hw, 1917 &sdata->u.mgd.beacon_connection_loss_work); 1918 } 1919 1920 static void ieee80211_sta_conn_mon_timer(unsigned long data) 1921 { 1922 struct ieee80211_sub_if_data *sdata = 1923 (struct ieee80211_sub_if_data *) data; 1924 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1925 struct ieee80211_local *local = sdata->local; 1926 1927 if (local->quiescing) 1928 return; 1929 1930 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 1931 } 1932 1933 static void ieee80211_sta_monitor_work(struct work_struct *work) 1934 { 1935 struct ieee80211_sub_if_data *sdata = 1936 container_of(work, struct ieee80211_sub_if_data, 1937 u.mgd.monitor_work); 1938 1939 ieee80211_mgd_probe_ap(sdata, false); 1940 } 1941 1942 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 1943 { 1944 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1945 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 1946 IEEE80211_STA_CONNECTION_POLL); 1947 1948 /* let's probe the connection once */ 1949 ieee80211_queue_work(&sdata->local->hw, 1950 &sdata->u.mgd.monitor_work); 1951 /* and do all the other regular work too */ 1952 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1953 } 1954 } 1955 1956 #ifdef CONFIG_PM 1957 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 1958 { 1959 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1960 1961 /* 1962 * we need to use atomic bitops for the running bits 1963 * only because both timers might fire at the same 1964 * time -- the code here is properly synchronised. 1965 */ 1966 1967 cancel_work_sync(&ifmgd->request_smps_work); 1968 1969 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 1970 if (del_timer_sync(&ifmgd->timer)) 1971 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1972 1973 cancel_work_sync(&ifmgd->chswitch_work); 1974 if (del_timer_sync(&ifmgd->chswitch_timer)) 1975 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 1976 1977 cancel_work_sync(&ifmgd->monitor_work); 1978 /* these will just be re-established on connection */ 1979 del_timer_sync(&ifmgd->conn_mon_timer); 1980 del_timer_sync(&ifmgd->bcn_mon_timer); 1981 } 1982 1983 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 1984 { 1985 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1986 1987 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 1988 add_timer(&ifmgd->timer); 1989 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 1990 add_timer(&ifmgd->chswitch_timer); 1991 } 1992 #endif 1993 1994 /* interface setup */ 1995 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 1996 { 1997 struct ieee80211_if_managed *ifmgd; 1998 1999 ifmgd = &sdata->u.mgd; 2000 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2001 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2002 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2003 ieee80211_beacon_connection_loss_work); 2004 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2005 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2006 (unsigned long) sdata); 2007 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2008 (unsigned long) sdata); 2009 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2010 (unsigned long) sdata); 2011 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2012 (unsigned long) sdata); 2013 2014 ifmgd->flags = 0; 2015 2016 mutex_init(&ifmgd->mtx); 2017 2018 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2019 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2020 else 2021 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2022 } 2023 2024 /* scan finished notification */ 2025 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2026 { 2027 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2028 2029 /* Restart STA timers */ 2030 rcu_read_lock(); 2031 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2032 ieee80211_restart_sta_timer(sdata); 2033 rcu_read_unlock(); 2034 } 2035 2036 int ieee80211_max_network_latency(struct notifier_block *nb, 2037 unsigned long data, void *dummy) 2038 { 2039 s32 latency_usec = (s32) data; 2040 struct ieee80211_local *local = 2041 container_of(nb, struct ieee80211_local, 2042 network_latency_notifier); 2043 2044 mutex_lock(&local->iflist_mtx); 2045 ieee80211_recalc_ps(local, latency_usec); 2046 mutex_unlock(&local->iflist_mtx); 2047 2048 return 0; 2049 } 2050 2051 /* config hooks */ 2052 static enum work_done_result 2053 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2054 struct sk_buff *skb) 2055 { 2056 if (!skb) { 2057 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2058 return WORK_DONE_DESTROY; 2059 } 2060 2061 if (wk->type == IEEE80211_WORK_AUTH) { 2062 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2063 return WORK_DONE_DESTROY; 2064 } 2065 2066 mutex_lock(&wk->sdata->u.mgd.mtx); 2067 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2068 mutex_unlock(&wk->sdata->u.mgd.mtx); 2069 2070 wk->type = IEEE80211_WORK_AUTH; 2071 wk->probe_auth.tries = 0; 2072 return WORK_DONE_REQUEUE; 2073 } 2074 2075 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2076 struct cfg80211_auth_request *req) 2077 { 2078 const u8 *ssid; 2079 struct ieee80211_work *wk; 2080 u16 auth_alg; 2081 2082 if (req->local_state_change) 2083 return 0; /* no need to update mac80211 state */ 2084 2085 switch (req->auth_type) { 2086 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2087 auth_alg = WLAN_AUTH_OPEN; 2088 break; 2089 case NL80211_AUTHTYPE_SHARED_KEY: 2090 if (IS_ERR(sdata->local->wep_tx_tfm)) 2091 return -EOPNOTSUPP; 2092 auth_alg = WLAN_AUTH_SHARED_KEY; 2093 break; 2094 case NL80211_AUTHTYPE_FT: 2095 auth_alg = WLAN_AUTH_FT; 2096 break; 2097 case NL80211_AUTHTYPE_NETWORK_EAP: 2098 auth_alg = WLAN_AUTH_LEAP; 2099 break; 2100 default: 2101 return -EOPNOTSUPP; 2102 } 2103 2104 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2105 if (!wk) 2106 return -ENOMEM; 2107 2108 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2109 2110 if (req->ie && req->ie_len) { 2111 memcpy(wk->ie, req->ie, req->ie_len); 2112 wk->ie_len = req->ie_len; 2113 } 2114 2115 if (req->key && req->key_len) { 2116 wk->probe_auth.key_len = req->key_len; 2117 wk->probe_auth.key_idx = req->key_idx; 2118 memcpy(wk->probe_auth.key, req->key, req->key_len); 2119 } 2120 2121 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2122 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2123 wk->probe_auth.ssid_len = ssid[1]; 2124 2125 wk->probe_auth.algorithm = auth_alg; 2126 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2127 2128 /* if we already have a probe, don't probe again */ 2129 if (req->bss->proberesp_ies) 2130 wk->type = IEEE80211_WORK_AUTH; 2131 else 2132 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2133 wk->chan = req->bss->channel; 2134 wk->sdata = sdata; 2135 wk->done = ieee80211_probe_auth_done; 2136 2137 ieee80211_add_work(wk); 2138 return 0; 2139 } 2140 2141 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2142 struct sk_buff *skb) 2143 { 2144 struct ieee80211_mgmt *mgmt; 2145 struct ieee80211_rx_status *rx_status; 2146 struct ieee802_11_elems elems; 2147 u16 status; 2148 2149 if (!skb) { 2150 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2151 return WORK_DONE_DESTROY; 2152 } 2153 2154 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2155 mutex_lock(&wk->sdata->u.mgd.mtx); 2156 rx_status = (void *) skb->cb; 2157 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2158 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2159 &elems, true); 2160 mutex_unlock(&wk->sdata->u.mgd.mtx); 2161 2162 wk->type = IEEE80211_WORK_ASSOC; 2163 /* not really done yet */ 2164 return WORK_DONE_REQUEUE; 2165 } 2166 2167 mgmt = (void *)skb->data; 2168 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2169 2170 if (status == WLAN_STATUS_SUCCESS) { 2171 mutex_lock(&wk->sdata->u.mgd.mtx); 2172 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2173 mutex_unlock(&wk->sdata->u.mgd.mtx); 2174 /* oops -- internal error -- send timeout for now */ 2175 cfg80211_send_assoc_timeout(wk->sdata->dev, 2176 wk->filter_ta); 2177 return WORK_DONE_DESTROY; 2178 } 2179 2180 mutex_unlock(&wk->sdata->u.mgd.mtx); 2181 } 2182 2183 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2184 return WORK_DONE_DESTROY; 2185 } 2186 2187 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2188 struct cfg80211_assoc_request *req) 2189 { 2190 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2191 struct ieee80211_bss *bss = (void *)req->bss->priv; 2192 struct ieee80211_work *wk; 2193 const u8 *ssid; 2194 int i; 2195 2196 mutex_lock(&ifmgd->mtx); 2197 if (ifmgd->associated) { 2198 if (!req->prev_bssid || 2199 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2200 ETH_ALEN)) { 2201 /* 2202 * We are already associated and the request was not a 2203 * reassociation request from the current BSS, so 2204 * reject it. 2205 */ 2206 mutex_unlock(&ifmgd->mtx); 2207 return -EALREADY; 2208 } 2209 2210 /* Trying to reassociate - clear previous association state */ 2211 ieee80211_set_disassoc(sdata, true, false); 2212 } 2213 mutex_unlock(&ifmgd->mtx); 2214 2215 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2216 if (!wk) 2217 return -ENOMEM; 2218 2219 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2220 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2221 2222 ifmgd->beacon_crc_valid = false; 2223 2224 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2225 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2226 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2227 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2228 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2229 2230 2231 if (req->ie && req->ie_len) { 2232 memcpy(wk->ie, req->ie, req->ie_len); 2233 wk->ie_len = req->ie_len; 2234 } else 2235 wk->ie_len = 0; 2236 2237 wk->assoc.bss = req->bss; 2238 2239 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2240 2241 /* new association always uses requested smps mode */ 2242 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2243 if (ifmgd->powersave) 2244 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2245 else 2246 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2247 } else 2248 ifmgd->ap_smps = ifmgd->req_smps; 2249 2250 wk->assoc.smps = ifmgd->ap_smps; 2251 /* 2252 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2253 * We still associate in non-HT mode (11a/b/g) if any one of these 2254 * ciphers is configured as pairwise. 2255 * We can set this to true for non-11n hardware, that'll be checked 2256 * separately along with the peer capabilities. 2257 */ 2258 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2259 wk->assoc.capability = req->bss->capability; 2260 wk->assoc.wmm_used = bss->wmm_used; 2261 wk->assoc.supp_rates = bss->supp_rates; 2262 wk->assoc.supp_rates_len = bss->supp_rates_len; 2263 wk->assoc.ht_information_ie = 2264 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2265 2266 if (bss->wmm_used && bss->uapsd_supported && 2267 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2268 wk->assoc.uapsd_used = true; 2269 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2270 } else { 2271 wk->assoc.uapsd_used = false; 2272 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2273 } 2274 2275 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2276 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2277 wk->assoc.ssid_len = ssid[1]; 2278 2279 if (req->prev_bssid) 2280 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2281 2282 wk->chan = req->bss->channel; 2283 wk->sdata = sdata; 2284 wk->done = ieee80211_assoc_done; 2285 if (!bss->dtim_period && 2286 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2287 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2288 else 2289 wk->type = IEEE80211_WORK_ASSOC; 2290 2291 if (req->use_mfp) { 2292 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2293 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2294 } else { 2295 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2296 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2297 } 2298 2299 if (req->crypto.control_port) 2300 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2301 else 2302 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2303 2304 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2305 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2306 2307 ieee80211_add_work(wk); 2308 return 0; 2309 } 2310 2311 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2312 struct cfg80211_deauth_request *req, 2313 void *cookie) 2314 { 2315 struct ieee80211_local *local = sdata->local; 2316 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2317 struct ieee80211_work *wk; 2318 u8 bssid[ETH_ALEN]; 2319 bool assoc_bss = false; 2320 2321 mutex_lock(&ifmgd->mtx); 2322 2323 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2324 if (ifmgd->associated == req->bss) { 2325 ieee80211_set_disassoc(sdata, false, true); 2326 mutex_unlock(&ifmgd->mtx); 2327 assoc_bss = true; 2328 } else { 2329 bool not_auth_yet = false; 2330 2331 mutex_unlock(&ifmgd->mtx); 2332 2333 mutex_lock(&local->mtx); 2334 list_for_each_entry(wk, &local->work_list, list) { 2335 if (wk->sdata != sdata) 2336 continue; 2337 2338 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2339 wk->type != IEEE80211_WORK_AUTH && 2340 wk->type != IEEE80211_WORK_ASSOC && 2341 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2342 continue; 2343 2344 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2345 continue; 2346 2347 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2348 list_del_rcu(&wk->list); 2349 free_work(wk); 2350 break; 2351 } 2352 mutex_unlock(&local->mtx); 2353 2354 /* 2355 * If somebody requests authentication and we haven't 2356 * sent out an auth frame yet there's no need to send 2357 * out a deauth frame either. If the state was PROBE, 2358 * then this is the case. If it's AUTH we have sent a 2359 * frame, and if it's IDLE we have completed the auth 2360 * process already. 2361 */ 2362 if (not_auth_yet) { 2363 __cfg80211_auth_canceled(sdata->dev, bssid); 2364 return 0; 2365 } 2366 } 2367 2368 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2369 sdata->name, bssid, req->reason_code); 2370 2371 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2372 req->reason_code, cookie, 2373 !req->local_state_change); 2374 if (assoc_bss) 2375 sta_info_destroy_addr(sdata, bssid); 2376 2377 mutex_lock(&sdata->local->mtx); 2378 ieee80211_recalc_idle(sdata->local); 2379 mutex_unlock(&sdata->local->mtx); 2380 2381 return 0; 2382 } 2383 2384 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2385 struct cfg80211_disassoc_request *req, 2386 void *cookie) 2387 { 2388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2389 u8 bssid[ETH_ALEN]; 2390 2391 mutex_lock(&ifmgd->mtx); 2392 2393 /* 2394 * cfg80211 should catch this ... but it's racy since 2395 * we can receive a disassoc frame, process it, hand it 2396 * to cfg80211 while that's in a locked section already 2397 * trying to tell us that the user wants to disconnect. 2398 */ 2399 if (ifmgd->associated != req->bss) { 2400 mutex_unlock(&ifmgd->mtx); 2401 return -ENOLINK; 2402 } 2403 2404 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2405 sdata->name, req->bss->bssid, req->reason_code); 2406 2407 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2408 ieee80211_set_disassoc(sdata, false, true); 2409 2410 mutex_unlock(&ifmgd->mtx); 2411 2412 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2413 IEEE80211_STYPE_DISASSOC, req->reason_code, 2414 cookie, !req->local_state_change); 2415 sta_info_destroy_addr(sdata, bssid); 2416 2417 mutex_lock(&sdata->local->mtx); 2418 ieee80211_recalc_idle(sdata->local); 2419 mutex_unlock(&sdata->local->mtx); 2420 2421 return 0; 2422 } 2423 2424 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2425 enum nl80211_cqm_rssi_threshold_event rssi_event, 2426 gfp_t gfp) 2427 { 2428 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2429 2430 trace_api_cqm_rssi_notify(sdata, rssi_event); 2431 2432 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2433 } 2434 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2435