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_NULLFUNC_TRIES 2 32 #define IEEE80211_MAX_PROBE_TRIES 5 33 34 /* 35 * Beacon loss timeout is calculated as N frames times the 36 * advertised beacon interval. This may need to be somewhat 37 * higher than what hardware might detect to account for 38 * delays in the host processing frames. But since we also 39 * probe on beacon miss before declaring the connection lost 40 * default to what we want. 41 */ 42 #define IEEE80211_BEACON_LOSS_COUNT 7 43 44 /* 45 * Time the connection can be idle before we probe 46 * it to see if we can still talk to the AP. 47 */ 48 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 49 /* 50 * Time we wait for a probe response after sending 51 * a probe request because of beacon loss or for 52 * checking the connection still works. 53 */ 54 #define IEEE80211_PROBE_WAIT (HZ / 2) 55 56 /* 57 * Weight given to the latest Beacon frame when calculating average signal 58 * strength for Beacon frames received in the current BSS. This must be 59 * between 1 and 15. 60 */ 61 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 62 63 /* 64 * How many Beacon frames need to have been used in average signal strength 65 * before starting to indicate signal change events. 66 */ 67 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 68 69 #define TMR_RUNNING_TIMER 0 70 #define TMR_RUNNING_CHANSW 1 71 72 /* 73 * All cfg80211 functions have to be called outside a locked 74 * section so that they can acquire a lock themselves... This 75 * is much simpler than queuing up things in cfg80211, but we 76 * do need some indirection for that here. 77 */ 78 enum rx_mgmt_action { 79 /* no action required */ 80 RX_MGMT_NONE, 81 82 /* caller must call cfg80211_send_rx_auth() */ 83 RX_MGMT_CFG80211_AUTH, 84 85 /* caller must call cfg80211_send_rx_assoc() */ 86 RX_MGMT_CFG80211_ASSOC, 87 88 /* caller must call cfg80211_send_deauth() */ 89 RX_MGMT_CFG80211_DEAUTH, 90 91 /* caller must call cfg80211_send_disassoc() */ 92 RX_MGMT_CFG80211_DISASSOC, 93 94 /* caller must tell cfg80211 about internal error */ 95 RX_MGMT_CFG80211_ASSOC_ERROR, 96 }; 97 98 /* utils */ 99 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 100 { 101 lockdep_assert_held(&ifmgd->mtx); 102 } 103 104 /* 105 * We can have multiple work items (and connection probing) 106 * scheduling this timer, but we need to take care to only 107 * reschedule it when it should fire _earlier_ than it was 108 * asked for before, or if it's not pending right now. This 109 * function ensures that. Note that it then is required to 110 * run this function for all timeouts after the first one 111 * has happened -- the work that runs from this timer will 112 * do that. 113 */ 114 static void run_again(struct ieee80211_if_managed *ifmgd, 115 unsigned long timeout) 116 { 117 ASSERT_MGD_MTX(ifmgd); 118 119 if (!timer_pending(&ifmgd->timer) || 120 time_before(timeout, ifmgd->timer.expires)) 121 mod_timer(&ifmgd->timer, timeout); 122 } 123 124 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 125 { 126 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 127 return; 128 129 mod_timer(&sdata->u.mgd.bcn_mon_timer, 130 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 131 } 132 133 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 134 { 135 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 136 137 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 138 return; 139 140 mod_timer(&sdata->u.mgd.conn_mon_timer, 141 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 142 143 ifmgd->probe_send_count = 0; 144 } 145 146 static int ecw2cw(int ecw) 147 { 148 return (1 << ecw) - 1; 149 } 150 151 /* 152 * ieee80211_enable_ht should be called only after the operating band 153 * has been determined as ht configuration depends on the hw's 154 * HT abilities for a specific band. 155 */ 156 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 157 struct ieee80211_ht_info *hti, 158 const u8 *bssid, u16 ap_ht_cap_flags) 159 { 160 struct ieee80211_local *local = sdata->local; 161 struct ieee80211_supported_band *sband; 162 struct sta_info *sta; 163 u32 changed = 0; 164 u16 ht_opmode; 165 bool enable_ht = true; 166 enum nl80211_channel_type prev_chantype; 167 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 168 169 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 170 171 prev_chantype = sdata->vif.bss_conf.channel_type; 172 173 /* HT is not supported */ 174 if (!sband->ht_cap.ht_supported) 175 enable_ht = false; 176 177 /* check that channel matches the right operating channel */ 178 if (local->hw.conf.channel->center_freq != 179 ieee80211_channel_to_frequency(hti->control_chan)) 180 enable_ht = false; 181 182 if (enable_ht) { 183 channel_type = NL80211_CHAN_HT20; 184 185 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 186 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 187 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 188 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 189 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 190 if (!(local->hw.conf.channel->flags & 191 IEEE80211_CHAN_NO_HT40PLUS)) 192 channel_type = NL80211_CHAN_HT40PLUS; 193 break; 194 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 195 if (!(local->hw.conf.channel->flags & 196 IEEE80211_CHAN_NO_HT40MINUS)) 197 channel_type = NL80211_CHAN_HT40MINUS; 198 break; 199 } 200 } 201 } 202 203 if (local->tmp_channel) 204 local->tmp_channel_type = channel_type; 205 206 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 207 /* can only fail due to HT40+/- mismatch */ 208 channel_type = NL80211_CHAN_HT20; 209 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 210 } 211 212 /* channel_type change automatically detected */ 213 ieee80211_hw_config(local, 0); 214 215 if (prev_chantype != channel_type) { 216 rcu_read_lock(); 217 sta = sta_info_get(sdata, bssid); 218 if (sta) 219 rate_control_rate_update(local, sband, sta, 220 IEEE80211_RC_HT_CHANGED, 221 channel_type); 222 rcu_read_unlock(); 223 } 224 225 ht_opmode = le16_to_cpu(hti->operation_mode); 226 227 /* if bss configuration changed store the new one */ 228 if (sdata->ht_opmode_valid != enable_ht || 229 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 230 prev_chantype != channel_type) { 231 changed |= BSS_CHANGED_HT; 232 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 233 sdata->ht_opmode_valid = enable_ht; 234 } 235 236 return changed; 237 } 238 239 /* frame sending functions */ 240 241 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 242 const u8 *bssid, u16 stype, u16 reason, 243 void *cookie, bool send_frame) 244 { 245 struct ieee80211_local *local = sdata->local; 246 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 247 struct sk_buff *skb; 248 struct ieee80211_mgmt *mgmt; 249 250 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 251 if (!skb) { 252 printk(KERN_DEBUG "%s: failed to allocate buffer for " 253 "deauth/disassoc frame\n", sdata->name); 254 return; 255 } 256 skb_reserve(skb, local->hw.extra_tx_headroom); 257 258 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 259 memset(mgmt, 0, 24); 260 memcpy(mgmt->da, bssid, ETH_ALEN); 261 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 262 memcpy(mgmt->bssid, bssid, ETH_ALEN); 263 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 264 skb_put(skb, 2); 265 /* u.deauth.reason_code == u.disassoc.reason_code */ 266 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 267 268 if (stype == IEEE80211_STYPE_DEAUTH) 269 if (cookie) 270 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 271 else 272 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 273 else 274 if (cookie) 275 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 276 else 277 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 278 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 279 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 280 281 if (send_frame) 282 ieee80211_tx_skb(sdata, skb); 283 else 284 kfree_skb(skb); 285 } 286 287 void ieee80211_send_pspoll(struct ieee80211_local *local, 288 struct ieee80211_sub_if_data *sdata) 289 { 290 struct ieee80211_pspoll *pspoll; 291 struct sk_buff *skb; 292 293 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 294 if (!skb) 295 return; 296 297 pspoll = (struct ieee80211_pspoll *) skb->data; 298 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 299 300 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 301 ieee80211_tx_skb(sdata, skb); 302 } 303 304 void ieee80211_send_nullfunc(struct ieee80211_local *local, 305 struct ieee80211_sub_if_data *sdata, 306 int powersave) 307 { 308 struct sk_buff *skb; 309 struct ieee80211_hdr_3addr *nullfunc; 310 311 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 312 if (!skb) 313 return; 314 315 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 316 if (powersave) 317 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 318 319 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 320 ieee80211_tx_skb(sdata, skb); 321 } 322 323 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 324 struct ieee80211_sub_if_data *sdata) 325 { 326 struct sk_buff *skb; 327 struct ieee80211_hdr *nullfunc; 328 __le16 fc; 329 330 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 331 return; 332 333 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 334 if (!skb) { 335 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 336 "nullfunc frame\n", sdata->name); 337 return; 338 } 339 skb_reserve(skb, local->hw.extra_tx_headroom); 340 341 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 342 memset(nullfunc, 0, 30); 343 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 344 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 345 nullfunc->frame_control = fc; 346 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 347 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 348 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 349 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 350 351 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 352 ieee80211_tx_skb(sdata, skb); 353 } 354 355 /* spectrum management related things */ 356 static void ieee80211_chswitch_work(struct work_struct *work) 357 { 358 struct ieee80211_sub_if_data *sdata = 359 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 360 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 361 362 if (!ieee80211_sdata_running(sdata)) 363 return; 364 365 mutex_lock(&ifmgd->mtx); 366 if (!ifmgd->associated) 367 goto out; 368 369 sdata->local->oper_channel = sdata->local->csa_channel; 370 if (!sdata->local->ops->channel_switch) { 371 /* call "hw_config" only if doing sw channel switch */ 372 ieee80211_hw_config(sdata->local, 373 IEEE80211_CONF_CHANGE_CHANNEL); 374 } 375 376 /* XXX: shouldn't really modify cfg80211-owned data! */ 377 ifmgd->associated->channel = sdata->local->oper_channel; 378 379 ieee80211_wake_queues_by_reason(&sdata->local->hw, 380 IEEE80211_QUEUE_STOP_REASON_CSA); 381 out: 382 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 383 mutex_unlock(&ifmgd->mtx); 384 } 385 386 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 387 { 388 struct ieee80211_sub_if_data *sdata; 389 struct ieee80211_if_managed *ifmgd; 390 391 sdata = vif_to_sdata(vif); 392 ifmgd = &sdata->u.mgd; 393 394 trace_api_chswitch_done(sdata, success); 395 if (!success) { 396 /* 397 * If the channel switch was not successful, stay 398 * around on the old channel. We currently lack 399 * good handling of this situation, possibly we 400 * should just drop the association. 401 */ 402 sdata->local->csa_channel = sdata->local->oper_channel; 403 } 404 405 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 406 } 407 EXPORT_SYMBOL(ieee80211_chswitch_done); 408 409 static void ieee80211_chswitch_timer(unsigned long data) 410 { 411 struct ieee80211_sub_if_data *sdata = 412 (struct ieee80211_sub_if_data *) data; 413 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 414 415 if (sdata->local->quiescing) { 416 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 417 return; 418 } 419 420 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 421 } 422 423 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 424 struct ieee80211_channel_sw_ie *sw_elem, 425 struct ieee80211_bss *bss, 426 u64 timestamp) 427 { 428 struct cfg80211_bss *cbss = 429 container_of((void *)bss, struct cfg80211_bss, priv); 430 struct ieee80211_channel *new_ch; 431 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 432 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num); 433 434 ASSERT_MGD_MTX(ifmgd); 435 436 if (!ifmgd->associated) 437 return; 438 439 if (sdata->local->scanning) 440 return; 441 442 /* Disregard subsequent beacons if we are already running a timer 443 processing a CSA */ 444 445 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 446 return; 447 448 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 449 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 450 return; 451 452 sdata->local->csa_channel = new_ch; 453 454 if (sdata->local->ops->channel_switch) { 455 /* use driver's channel switch callback */ 456 struct ieee80211_channel_switch ch_switch; 457 memset(&ch_switch, 0, sizeof(ch_switch)); 458 ch_switch.timestamp = timestamp; 459 if (sw_elem->mode) { 460 ch_switch.block_tx = true; 461 ieee80211_stop_queues_by_reason(&sdata->local->hw, 462 IEEE80211_QUEUE_STOP_REASON_CSA); 463 } 464 ch_switch.channel = new_ch; 465 ch_switch.count = sw_elem->count; 466 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 467 drv_channel_switch(sdata->local, &ch_switch); 468 return; 469 } 470 471 /* channel switch handled in software */ 472 if (sw_elem->count <= 1) { 473 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 474 } else { 475 if (sw_elem->mode) 476 ieee80211_stop_queues_by_reason(&sdata->local->hw, 477 IEEE80211_QUEUE_STOP_REASON_CSA); 478 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 479 mod_timer(&ifmgd->chswitch_timer, 480 jiffies + 481 msecs_to_jiffies(sw_elem->count * 482 cbss->beacon_interval)); 483 } 484 } 485 486 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 487 u16 capab_info, u8 *pwr_constr_elem, 488 u8 pwr_constr_elem_len) 489 { 490 struct ieee80211_conf *conf = &sdata->local->hw.conf; 491 492 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 493 return; 494 495 /* Power constraint IE length should be 1 octet */ 496 if (pwr_constr_elem_len != 1) 497 return; 498 499 if ((*pwr_constr_elem <= conf->channel->max_power) && 500 (*pwr_constr_elem != sdata->local->power_constr_level)) { 501 sdata->local->power_constr_level = *pwr_constr_elem; 502 ieee80211_hw_config(sdata->local, 0); 503 } 504 } 505 506 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 507 { 508 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 509 struct ieee80211_local *local = sdata->local; 510 struct ieee80211_conf *conf = &local->hw.conf; 511 512 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 513 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 514 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 515 516 local->disable_dynamic_ps = false; 517 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 518 } 519 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 520 521 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 522 { 523 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 524 struct ieee80211_local *local = sdata->local; 525 struct ieee80211_conf *conf = &local->hw.conf; 526 527 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 528 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 529 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 530 531 local->disable_dynamic_ps = true; 532 conf->dynamic_ps_timeout = 0; 533 del_timer_sync(&local->dynamic_ps_timer); 534 ieee80211_queue_work(&local->hw, 535 &local->dynamic_ps_enable_work); 536 } 537 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 538 539 /* powersave */ 540 static void ieee80211_enable_ps(struct ieee80211_local *local, 541 struct ieee80211_sub_if_data *sdata) 542 { 543 struct ieee80211_conf *conf = &local->hw.conf; 544 545 /* 546 * If we are scanning right now then the parameters will 547 * take effect when scan finishes. 548 */ 549 if (local->scanning) 550 return; 551 552 if (conf->dynamic_ps_timeout > 0 && 553 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 554 mod_timer(&local->dynamic_ps_timer, jiffies + 555 msecs_to_jiffies(conf->dynamic_ps_timeout)); 556 } else { 557 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 558 ieee80211_send_nullfunc(local, sdata, 1); 559 560 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 561 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 562 return; 563 564 conf->flags |= IEEE80211_CONF_PS; 565 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 566 } 567 } 568 569 static void ieee80211_change_ps(struct ieee80211_local *local) 570 { 571 struct ieee80211_conf *conf = &local->hw.conf; 572 573 if (local->ps_sdata) { 574 ieee80211_enable_ps(local, local->ps_sdata); 575 } else if (conf->flags & IEEE80211_CONF_PS) { 576 conf->flags &= ~IEEE80211_CONF_PS; 577 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 578 del_timer_sync(&local->dynamic_ps_timer); 579 cancel_work_sync(&local->dynamic_ps_enable_work); 580 } 581 } 582 583 /* need to hold RTNL or interface lock */ 584 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 585 { 586 struct ieee80211_sub_if_data *sdata, *found = NULL; 587 int count = 0; 588 int timeout; 589 590 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 591 local->ps_sdata = NULL; 592 return; 593 } 594 595 if (!list_empty(&local->work_list)) { 596 local->ps_sdata = NULL; 597 goto change; 598 } 599 600 list_for_each_entry(sdata, &local->interfaces, list) { 601 if (!ieee80211_sdata_running(sdata)) 602 continue; 603 if (sdata->vif.type != NL80211_IFTYPE_STATION) 604 continue; 605 found = sdata; 606 count++; 607 } 608 609 if (count == 1 && found->u.mgd.powersave && 610 found->u.mgd.associated && 611 found->u.mgd.associated->beacon_ies && 612 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 613 IEEE80211_STA_CONNECTION_POLL))) { 614 struct ieee80211_conf *conf = &local->hw.conf; 615 s32 beaconint_us; 616 617 if (latency < 0) 618 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 619 620 beaconint_us = ieee80211_tu_to_usec( 621 found->vif.bss_conf.beacon_int); 622 623 timeout = local->dynamic_ps_forced_timeout; 624 if (timeout < 0) { 625 /* 626 * Go to full PSM if the user configures a very low 627 * latency requirement. 628 * The 2000 second value is there for compatibility 629 * until the PM_QOS_NETWORK_LATENCY is configured 630 * with real values. 631 */ 632 if (latency > (1900 * USEC_PER_MSEC) && 633 latency != (2000 * USEC_PER_SEC)) 634 timeout = 0; 635 else 636 timeout = 100; 637 } 638 local->dynamic_ps_user_timeout = timeout; 639 if (!local->disable_dynamic_ps) 640 conf->dynamic_ps_timeout = 641 local->dynamic_ps_user_timeout; 642 643 if (beaconint_us > latency) { 644 local->ps_sdata = NULL; 645 } else { 646 struct ieee80211_bss *bss; 647 int maxslp = 1; 648 u8 dtimper; 649 650 bss = (void *)found->u.mgd.associated->priv; 651 dtimper = bss->dtim_period; 652 653 /* If the TIM IE is invalid, pretend the value is 1 */ 654 if (!dtimper) 655 dtimper = 1; 656 else if (dtimper > 1) 657 maxslp = min_t(int, dtimper, 658 latency / beaconint_us); 659 660 local->hw.conf.max_sleep_period = maxslp; 661 local->hw.conf.ps_dtim_period = dtimper; 662 local->ps_sdata = found; 663 } 664 } else { 665 local->ps_sdata = NULL; 666 } 667 668 change: 669 ieee80211_change_ps(local); 670 } 671 672 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 673 { 674 struct ieee80211_local *local = 675 container_of(work, struct ieee80211_local, 676 dynamic_ps_disable_work); 677 678 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 679 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 680 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 681 } 682 683 ieee80211_wake_queues_by_reason(&local->hw, 684 IEEE80211_QUEUE_STOP_REASON_PS); 685 } 686 687 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 688 { 689 struct ieee80211_local *local = 690 container_of(work, struct ieee80211_local, 691 dynamic_ps_enable_work); 692 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 693 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 694 695 /* can only happen when PS was just disabled anyway */ 696 if (!sdata) 697 return; 698 699 if (local->hw.conf.flags & IEEE80211_CONF_PS) 700 return; 701 702 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 703 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) 704 ieee80211_send_nullfunc(local, sdata, 1); 705 706 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 707 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 708 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 709 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 710 local->hw.conf.flags |= IEEE80211_CONF_PS; 711 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 712 } 713 } 714 715 void ieee80211_dynamic_ps_timer(unsigned long data) 716 { 717 struct ieee80211_local *local = (void *) data; 718 719 if (local->quiescing || local->suspended) 720 return; 721 722 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 723 } 724 725 /* MLME */ 726 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 727 struct ieee80211_sub_if_data *sdata, 728 u8 *wmm_param, size_t wmm_param_len) 729 { 730 struct ieee80211_tx_queue_params params; 731 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 732 size_t left; 733 int count; 734 u8 *pos, uapsd_queues = 0; 735 736 if (!local->ops->conf_tx) 737 return; 738 739 if (local->hw.queues < 4) 740 return; 741 742 if (!wmm_param) 743 return; 744 745 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 746 return; 747 748 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 749 uapsd_queues = local->uapsd_queues; 750 751 count = wmm_param[6] & 0x0f; 752 if (count == ifmgd->wmm_last_param_set) 753 return; 754 ifmgd->wmm_last_param_set = count; 755 756 pos = wmm_param + 8; 757 left = wmm_param_len - 8; 758 759 memset(¶ms, 0, sizeof(params)); 760 761 local->wmm_acm = 0; 762 for (; left >= 4; left -= 4, pos += 4) { 763 int aci = (pos[0] >> 5) & 0x03; 764 int acm = (pos[0] >> 4) & 0x01; 765 bool uapsd = false; 766 int queue; 767 768 switch (aci) { 769 case 1: /* AC_BK */ 770 queue = 3; 771 if (acm) 772 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 774 uapsd = true; 775 break; 776 case 2: /* AC_VI */ 777 queue = 1; 778 if (acm) 779 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 781 uapsd = true; 782 break; 783 case 3: /* AC_VO */ 784 queue = 0; 785 if (acm) 786 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 787 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 788 uapsd = true; 789 break; 790 case 0: /* AC_BE */ 791 default: 792 queue = 2; 793 if (acm) 794 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 795 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 796 uapsd = true; 797 break; 798 } 799 800 params.aifs = pos[0] & 0x0f; 801 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 802 params.cw_min = ecw2cw(pos[1] & 0x0f); 803 params.txop = get_unaligned_le16(pos + 2); 804 params.uapsd = uapsd; 805 806 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 807 wiphy_debug(local->hw.wiphy, 808 "WMM queue=%d aci=%d acm=%d aifs=%d " 809 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 810 queue, aci, acm, 811 params.aifs, params.cw_min, params.cw_max, 812 params.txop, params.uapsd); 813 #endif 814 if (drv_conf_tx(local, queue, ¶ms)) 815 wiphy_debug(local->hw.wiphy, 816 "failed to set TX queue parameters for queue %d\n", 817 queue); 818 } 819 820 /* enable WMM or activate new settings */ 821 sdata->vif.bss_conf.qos = true; 822 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 823 } 824 825 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 826 u16 capab, bool erp_valid, u8 erp) 827 { 828 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 829 u32 changed = 0; 830 bool use_protection; 831 bool use_short_preamble; 832 bool use_short_slot; 833 834 if (erp_valid) { 835 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 836 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 837 } else { 838 use_protection = false; 839 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 840 } 841 842 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 843 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 844 use_short_slot = true; 845 846 if (use_protection != bss_conf->use_cts_prot) { 847 bss_conf->use_cts_prot = use_protection; 848 changed |= BSS_CHANGED_ERP_CTS_PROT; 849 } 850 851 if (use_short_preamble != bss_conf->use_short_preamble) { 852 bss_conf->use_short_preamble = use_short_preamble; 853 changed |= BSS_CHANGED_ERP_PREAMBLE; 854 } 855 856 if (use_short_slot != bss_conf->use_short_slot) { 857 bss_conf->use_short_slot = use_short_slot; 858 changed |= BSS_CHANGED_ERP_SLOT; 859 } 860 861 return changed; 862 } 863 864 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 865 struct cfg80211_bss *cbss, 866 u32 bss_info_changed) 867 { 868 struct ieee80211_bss *bss = (void *)cbss->priv; 869 struct ieee80211_local *local = sdata->local; 870 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 871 872 bss_info_changed |= BSS_CHANGED_ASSOC; 873 /* set timing information */ 874 bss_conf->beacon_int = cbss->beacon_interval; 875 bss_conf->timestamp = cbss->tsf; 876 877 bss_info_changed |= BSS_CHANGED_BEACON_INT; 878 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 879 cbss->capability, bss->has_erp_value, bss->erp_value); 880 881 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 882 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 883 884 sdata->u.mgd.associated = cbss; 885 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 886 887 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 888 889 /* just to be sure */ 890 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 891 IEEE80211_STA_BEACON_POLL); 892 893 ieee80211_led_assoc(local, 1); 894 895 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 896 bss_conf->dtim_period = bss->dtim_period; 897 else 898 bss_conf->dtim_period = 0; 899 900 bss_conf->assoc = 1; 901 /* 902 * For now just always ask the driver to update the basic rateset 903 * when we have associated, we aren't checking whether it actually 904 * changed or not. 905 */ 906 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 907 908 /* And the BSSID changed - we're associated now */ 909 bss_info_changed |= BSS_CHANGED_BSSID; 910 911 /* Tell the driver to monitor connection quality (if supported) */ 912 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 913 bss_conf->cqm_rssi_thold) 914 bss_info_changed |= BSS_CHANGED_CQM; 915 916 /* Enable ARP filtering */ 917 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 918 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 919 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 920 } 921 922 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 923 924 mutex_lock(&local->iflist_mtx); 925 ieee80211_recalc_ps(local, -1); 926 ieee80211_recalc_smps(local); 927 mutex_unlock(&local->iflist_mtx); 928 929 netif_tx_start_all_queues(sdata->dev); 930 netif_carrier_on(sdata->dev); 931 } 932 933 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 934 bool remove_sta, bool tx) 935 { 936 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 937 struct ieee80211_local *local = sdata->local; 938 struct sta_info *sta; 939 u32 changed = 0, config_changed = 0; 940 u8 bssid[ETH_ALEN]; 941 942 ASSERT_MGD_MTX(ifmgd); 943 944 if (WARN_ON(!ifmgd->associated)) 945 return; 946 947 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 948 949 ifmgd->associated = NULL; 950 memset(ifmgd->bssid, 0, ETH_ALEN); 951 952 /* 953 * we need to commit the associated = NULL change because the 954 * scan code uses that to determine whether this iface should 955 * go to/wake up from powersave or not -- and could otherwise 956 * wake the queues erroneously. 957 */ 958 smp_mb(); 959 960 /* 961 * Thus, we can only afterwards stop the queues -- to account 962 * for the case where another CPU is finishing a scan at this 963 * time -- we don't want the scan code to enable queues. 964 */ 965 966 netif_tx_stop_all_queues(sdata->dev); 967 netif_carrier_off(sdata->dev); 968 969 mutex_lock(&local->sta_mtx); 970 sta = sta_info_get(sdata, bssid); 971 if (sta) { 972 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 973 ieee80211_sta_tear_down_BA_sessions(sta, tx); 974 } 975 mutex_unlock(&local->sta_mtx); 976 977 changed |= ieee80211_reset_erp_info(sdata); 978 979 ieee80211_led_assoc(local, 0); 980 changed |= BSS_CHANGED_ASSOC; 981 sdata->vif.bss_conf.assoc = false; 982 983 ieee80211_set_wmm_default(sdata); 984 985 /* channel(_type) changes are handled by ieee80211_hw_config */ 986 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 987 988 /* on the next assoc, re-program HT parameters */ 989 sdata->ht_opmode_valid = false; 990 991 local->power_constr_level = 0; 992 993 del_timer_sync(&local->dynamic_ps_timer); 994 cancel_work_sync(&local->dynamic_ps_enable_work); 995 996 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 997 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 998 config_changed |= IEEE80211_CONF_CHANGE_PS; 999 } 1000 1001 ieee80211_hw_config(local, config_changed); 1002 1003 /* Disable ARP filtering */ 1004 if (sdata->vif.bss_conf.arp_filter_enabled) { 1005 sdata->vif.bss_conf.arp_filter_enabled = false; 1006 changed |= BSS_CHANGED_ARP_FILTER; 1007 } 1008 1009 /* The BSSID (not really interesting) and HT changed */ 1010 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1011 ieee80211_bss_info_change_notify(sdata, changed); 1012 1013 if (remove_sta) 1014 sta_info_destroy_addr(sdata, bssid); 1015 1016 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1017 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1018 del_timer_sync(&sdata->u.mgd.timer); 1019 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1020 } 1021 1022 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1023 struct ieee80211_hdr *hdr) 1024 { 1025 /* 1026 * We can postpone the mgd.timer whenever receiving unicast frames 1027 * from AP because we know that the connection is working both ways 1028 * at that time. But multicast frames (and hence also beacons) must 1029 * be ignored here, because we need to trigger the timer during 1030 * data idle periods for sending the periodic probe request to the 1031 * AP we're connected to. 1032 */ 1033 if (is_multicast_ether_addr(hdr->addr1)) 1034 return; 1035 1036 /* 1037 * In case we receive frames after disassociation. 1038 */ 1039 if (!sdata->u.mgd.associated) 1040 return; 1041 1042 ieee80211_sta_reset_conn_monitor(sdata); 1043 } 1044 1045 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1046 { 1047 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1048 1049 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1050 IEEE80211_STA_CONNECTION_POLL))) 1051 return; 1052 1053 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1054 IEEE80211_STA_BEACON_POLL); 1055 mutex_lock(&sdata->local->iflist_mtx); 1056 ieee80211_recalc_ps(sdata->local, -1); 1057 mutex_unlock(&sdata->local->iflist_mtx); 1058 1059 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1060 return; 1061 1062 /* 1063 * We've received a probe response, but are not sure whether 1064 * we have or will be receiving any beacons or data, so let's 1065 * schedule the timers again, just in case. 1066 */ 1067 ieee80211_sta_reset_beacon_monitor(sdata); 1068 1069 mod_timer(&ifmgd->conn_mon_timer, 1070 round_jiffies_up(jiffies + 1071 IEEE80211_CONNECTION_IDLE_TIME)); 1072 } 1073 1074 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1075 struct ieee80211_hdr *hdr, bool ack) 1076 { 1077 if (!ieee80211_is_data(hdr->frame_control)) 1078 return; 1079 1080 if (ack) 1081 ieee80211_sta_reset_conn_monitor(sdata); 1082 1083 if (ieee80211_is_nullfunc(hdr->frame_control) && 1084 sdata->u.mgd.probe_send_count > 0) { 1085 if (ack) 1086 sdata->u.mgd.probe_send_count = 0; 1087 else 1088 sdata->u.mgd.nullfunc_failed = true; 1089 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1090 } 1091 } 1092 1093 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1094 { 1095 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1096 const u8 *ssid; 1097 u8 *dst = ifmgd->associated->bssid; 1098 u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3); 1099 1100 /* 1101 * Try sending broadcast probe requests for the last three 1102 * probe requests after the first ones failed since some 1103 * buggy APs only support broadcast probe requests. 1104 */ 1105 if (ifmgd->probe_send_count >= unicast_limit) 1106 dst = NULL; 1107 1108 /* 1109 * When the hardware reports an accurate Tx ACK status, it's 1110 * better to send a nullfunc frame instead of a probe request, 1111 * as it will kick us off the AP quickly if we aren't associated 1112 * anymore. The timeout will be reset if the frame is ACKed by 1113 * the AP. 1114 */ 1115 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1116 ifmgd->nullfunc_failed = false; 1117 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1118 } else { 1119 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1120 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1121 } 1122 1123 ifmgd->probe_send_count++; 1124 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT; 1125 run_again(ifmgd, ifmgd->probe_timeout); 1126 } 1127 1128 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1129 bool beacon) 1130 { 1131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1132 bool already = false; 1133 1134 if (!ieee80211_sdata_running(sdata)) 1135 return; 1136 1137 if (sdata->local->scanning) 1138 return; 1139 1140 if (sdata->local->tmp_channel) 1141 return; 1142 1143 mutex_lock(&ifmgd->mtx); 1144 1145 if (!ifmgd->associated) 1146 goto out; 1147 1148 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1149 if (beacon && net_ratelimit()) 1150 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1151 "- sending probe request\n", sdata->name); 1152 #endif 1153 1154 /* 1155 * The driver/our work has already reported this event or the 1156 * connection monitoring has kicked in and we have already sent 1157 * a probe request. Or maybe the AP died and the driver keeps 1158 * reporting until we disassociate... 1159 * 1160 * In either case we have to ignore the current call to this 1161 * function (except for setting the correct probe reason bit) 1162 * because otherwise we would reset the timer every time and 1163 * never check whether we received a probe response! 1164 */ 1165 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1166 IEEE80211_STA_CONNECTION_POLL)) 1167 already = true; 1168 1169 if (beacon) 1170 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1171 else 1172 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1173 1174 if (already) 1175 goto out; 1176 1177 mutex_lock(&sdata->local->iflist_mtx); 1178 ieee80211_recalc_ps(sdata->local, -1); 1179 mutex_unlock(&sdata->local->iflist_mtx); 1180 1181 ifmgd->probe_send_count = 0; 1182 ieee80211_mgd_probe_ap_send(sdata); 1183 out: 1184 mutex_unlock(&ifmgd->mtx); 1185 } 1186 1187 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1188 struct ieee80211_vif *vif) 1189 { 1190 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1191 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1192 struct sk_buff *skb; 1193 const u8 *ssid; 1194 1195 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1196 return NULL; 1197 1198 ASSERT_MGD_MTX(ifmgd); 1199 1200 if (!ifmgd->associated) 1201 return NULL; 1202 1203 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1204 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1205 ssid + 2, ssid[1], NULL, 0); 1206 1207 return skb; 1208 } 1209 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1210 1211 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1212 { 1213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1214 struct ieee80211_local *local = sdata->local; 1215 u8 bssid[ETH_ALEN]; 1216 1217 mutex_lock(&ifmgd->mtx); 1218 if (!ifmgd->associated) { 1219 mutex_unlock(&ifmgd->mtx); 1220 return; 1221 } 1222 1223 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1224 1225 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid); 1226 1227 ieee80211_set_disassoc(sdata, true, true); 1228 mutex_unlock(&ifmgd->mtx); 1229 1230 mutex_lock(&local->mtx); 1231 ieee80211_recalc_idle(local); 1232 mutex_unlock(&local->mtx); 1233 /* 1234 * must be outside lock due to cfg80211, 1235 * but that's not a problem. 1236 */ 1237 ieee80211_send_deauth_disassoc(sdata, bssid, 1238 IEEE80211_STYPE_DEAUTH, 1239 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1240 NULL, true); 1241 } 1242 1243 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1244 { 1245 struct ieee80211_sub_if_data *sdata = 1246 container_of(work, struct ieee80211_sub_if_data, 1247 u.mgd.beacon_connection_loss_work); 1248 1249 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1250 __ieee80211_connection_loss(sdata); 1251 else 1252 ieee80211_mgd_probe_ap(sdata, true); 1253 } 1254 1255 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1256 { 1257 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1258 struct ieee80211_hw *hw = &sdata->local->hw; 1259 1260 trace_api_beacon_loss(sdata); 1261 1262 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1263 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1264 } 1265 EXPORT_SYMBOL(ieee80211_beacon_loss); 1266 1267 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1268 { 1269 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1270 struct ieee80211_hw *hw = &sdata->local->hw; 1271 1272 trace_api_connection_loss(sdata); 1273 1274 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1275 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1276 } 1277 EXPORT_SYMBOL(ieee80211_connection_loss); 1278 1279 1280 static enum rx_mgmt_action __must_check 1281 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1282 struct ieee80211_mgmt *mgmt, size_t len) 1283 { 1284 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1285 const u8 *bssid = NULL; 1286 u16 reason_code; 1287 1288 if (len < 24 + 2) 1289 return RX_MGMT_NONE; 1290 1291 ASSERT_MGD_MTX(ifmgd); 1292 1293 bssid = ifmgd->associated->bssid; 1294 1295 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1296 1297 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1298 sdata->name, bssid, reason_code); 1299 1300 ieee80211_set_disassoc(sdata, true, false); 1301 mutex_lock(&sdata->local->mtx); 1302 ieee80211_recalc_idle(sdata->local); 1303 mutex_unlock(&sdata->local->mtx); 1304 1305 return RX_MGMT_CFG80211_DEAUTH; 1306 } 1307 1308 1309 static enum rx_mgmt_action __must_check 1310 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1311 struct ieee80211_mgmt *mgmt, size_t len) 1312 { 1313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1314 u16 reason_code; 1315 1316 if (len < 24 + 2) 1317 return RX_MGMT_NONE; 1318 1319 ASSERT_MGD_MTX(ifmgd); 1320 1321 if (WARN_ON(!ifmgd->associated)) 1322 return RX_MGMT_NONE; 1323 1324 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1325 return RX_MGMT_NONE; 1326 1327 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1328 1329 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1330 sdata->name, mgmt->sa, reason_code); 1331 1332 ieee80211_set_disassoc(sdata, true, false); 1333 mutex_lock(&sdata->local->mtx); 1334 ieee80211_recalc_idle(sdata->local); 1335 mutex_unlock(&sdata->local->mtx); 1336 return RX_MGMT_CFG80211_DISASSOC; 1337 } 1338 1339 1340 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1341 struct ieee80211_mgmt *mgmt, size_t len) 1342 { 1343 struct ieee80211_sub_if_data *sdata = wk->sdata; 1344 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1345 struct ieee80211_local *local = sdata->local; 1346 struct ieee80211_supported_band *sband; 1347 struct sta_info *sta; 1348 struct cfg80211_bss *cbss = wk->assoc.bss; 1349 u8 *pos; 1350 u32 rates, basic_rates; 1351 u16 capab_info, aid; 1352 struct ieee802_11_elems elems; 1353 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1354 u32 changed = 0; 1355 int i, j, err; 1356 bool have_higher_than_11mbit = false; 1357 u16 ap_ht_cap_flags; 1358 1359 /* AssocResp and ReassocResp have identical structure */ 1360 1361 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1362 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1363 1364 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1365 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1366 "set\n", sdata->name, aid); 1367 aid &= ~(BIT(15) | BIT(14)); 1368 1369 pos = mgmt->u.assoc_resp.variable; 1370 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1371 1372 if (!elems.supp_rates) { 1373 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1374 sdata->name); 1375 return false; 1376 } 1377 1378 ifmgd->aid = aid; 1379 1380 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1381 if (!sta) { 1382 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1383 " the AP\n", sdata->name); 1384 return false; 1385 } 1386 1387 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1388 WLAN_STA_ASSOC_AP); 1389 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1390 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1391 1392 rates = 0; 1393 basic_rates = 0; 1394 sband = local->hw.wiphy->bands[wk->chan->band]; 1395 1396 for (i = 0; i < elems.supp_rates_len; i++) { 1397 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1398 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1399 1400 if (rate > 110) 1401 have_higher_than_11mbit = true; 1402 1403 for (j = 0; j < sband->n_bitrates; j++) { 1404 if (sband->bitrates[j].bitrate == rate) { 1405 rates |= BIT(j); 1406 if (is_basic) 1407 basic_rates |= BIT(j); 1408 break; 1409 } 1410 } 1411 } 1412 1413 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1414 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1415 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1416 1417 if (rate > 110) 1418 have_higher_than_11mbit = true; 1419 1420 for (j = 0; j < sband->n_bitrates; j++) { 1421 if (sband->bitrates[j].bitrate == rate) { 1422 rates |= BIT(j); 1423 if (is_basic) 1424 basic_rates |= BIT(j); 1425 break; 1426 } 1427 } 1428 } 1429 1430 sta->sta.supp_rates[wk->chan->band] = rates; 1431 sdata->vif.bss_conf.basic_rates = basic_rates; 1432 1433 /* cf. IEEE 802.11 9.2.12 */ 1434 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1435 have_higher_than_11mbit) 1436 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1437 else 1438 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1439 1440 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1441 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1442 elems.ht_cap_elem, &sta->sta.ht_cap); 1443 1444 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1445 1446 rate_control_rate_init(sta); 1447 1448 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1449 set_sta_flags(sta, WLAN_STA_MFP); 1450 1451 if (elems.wmm_param) 1452 set_sta_flags(sta, WLAN_STA_WME); 1453 1454 err = sta_info_insert(sta); 1455 sta = NULL; 1456 if (err) { 1457 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1458 " the AP (error %d)\n", sdata->name, err); 1459 return false; 1460 } 1461 1462 /* 1463 * Always handle WMM once after association regardless 1464 * of the first value the AP uses. Setting -1 here has 1465 * that effect because the AP values is an unsigned 1466 * 4-bit value. 1467 */ 1468 ifmgd->wmm_last_param_set = -1; 1469 1470 if (elems.wmm_param) 1471 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1472 elems.wmm_param_len); 1473 else 1474 ieee80211_set_wmm_default(sdata); 1475 1476 local->oper_channel = wk->chan; 1477 1478 if (elems.ht_info_elem && elems.wmm_param && 1479 (sdata->local->hw.queues >= 4) && 1480 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1481 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1482 cbss->bssid, ap_ht_cap_flags); 1483 1484 /* set AID and assoc capability, 1485 * ieee80211_set_associated() will tell the driver */ 1486 bss_conf->aid = aid; 1487 bss_conf->assoc_capability = capab_info; 1488 ieee80211_set_associated(sdata, cbss, changed); 1489 1490 /* 1491 * If we're using 4-addr mode, let the AP know that we're 1492 * doing so, so that it can create the STA VLAN on its side 1493 */ 1494 if (ifmgd->use_4addr) 1495 ieee80211_send_4addr_nullfunc(local, sdata); 1496 1497 /* 1498 * Start timer to probe the connection to the AP now. 1499 * Also start the timer that will detect beacon loss. 1500 */ 1501 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1502 ieee80211_sta_reset_beacon_monitor(sdata); 1503 1504 return true; 1505 } 1506 1507 1508 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1509 struct ieee80211_mgmt *mgmt, 1510 size_t len, 1511 struct ieee80211_rx_status *rx_status, 1512 struct ieee802_11_elems *elems, 1513 bool beacon) 1514 { 1515 struct ieee80211_local *local = sdata->local; 1516 int freq; 1517 struct ieee80211_bss *bss; 1518 struct ieee80211_channel *channel; 1519 bool need_ps = false; 1520 1521 if (sdata->u.mgd.associated) { 1522 bss = (void *)sdata->u.mgd.associated->priv; 1523 /* not previously set so we may need to recalc */ 1524 need_ps = !bss->dtim_period; 1525 } 1526 1527 if (elems->ds_params && elems->ds_params_len == 1) 1528 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1529 else 1530 freq = rx_status->freq; 1531 1532 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1533 1534 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1535 return; 1536 1537 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1538 channel, beacon); 1539 if (bss) 1540 ieee80211_rx_bss_put(local, bss); 1541 1542 if (!sdata->u.mgd.associated) 1543 return; 1544 1545 if (need_ps) { 1546 mutex_lock(&local->iflist_mtx); 1547 ieee80211_recalc_ps(local, -1); 1548 mutex_unlock(&local->iflist_mtx); 1549 } 1550 1551 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1552 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1553 ETH_ALEN) == 0)) { 1554 struct ieee80211_channel_sw_ie *sw_elem = 1555 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1556 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1557 bss, rx_status->mactime); 1558 } 1559 } 1560 1561 1562 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1563 struct sk_buff *skb) 1564 { 1565 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1566 struct ieee80211_if_managed *ifmgd; 1567 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1568 size_t baselen, len = skb->len; 1569 struct ieee802_11_elems elems; 1570 1571 ifmgd = &sdata->u.mgd; 1572 1573 ASSERT_MGD_MTX(ifmgd); 1574 1575 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1576 return; /* ignore ProbeResp to foreign address */ 1577 1578 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1579 if (baselen > len) 1580 return; 1581 1582 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1583 &elems); 1584 1585 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1586 1587 if (ifmgd->associated && 1588 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1589 ieee80211_reset_ap_probe(sdata); 1590 } 1591 1592 /* 1593 * This is the canonical list of information elements we care about, 1594 * the filter code also gives us all changes to the Microsoft OUI 1595 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1596 * 1597 * We implement beacon filtering in software since that means we can 1598 * avoid processing the frame here and in cfg80211, and userspace 1599 * will not be able to tell whether the hardware supports it or not. 1600 * 1601 * XXX: This list needs to be dynamic -- userspace needs to be able to 1602 * add items it requires. It also needs to be able to tell us to 1603 * look out for other vendor IEs. 1604 */ 1605 static const u64 care_about_ies = 1606 (1ULL << WLAN_EID_COUNTRY) | 1607 (1ULL << WLAN_EID_ERP_INFO) | 1608 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1609 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1610 (1ULL << WLAN_EID_HT_CAPABILITY) | 1611 (1ULL << WLAN_EID_HT_INFORMATION); 1612 1613 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1614 struct ieee80211_mgmt *mgmt, 1615 size_t len, 1616 struct ieee80211_rx_status *rx_status) 1617 { 1618 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1619 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1620 size_t baselen; 1621 struct ieee802_11_elems elems; 1622 struct ieee80211_local *local = sdata->local; 1623 u32 changed = 0; 1624 bool erp_valid, directed_tim = false; 1625 u8 erp_value = 0; 1626 u32 ncrc; 1627 u8 *bssid; 1628 1629 ASSERT_MGD_MTX(ifmgd); 1630 1631 /* Process beacon from the current BSS */ 1632 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1633 if (baselen > len) 1634 return; 1635 1636 if (rx_status->freq != local->hw.conf.channel->center_freq) 1637 return; 1638 1639 /* 1640 * We might have received a number of frames, among them a 1641 * disassoc frame and a beacon... 1642 */ 1643 if (!ifmgd->associated) 1644 return; 1645 1646 bssid = ifmgd->associated->bssid; 1647 1648 /* 1649 * And in theory even frames from a different AP we were just 1650 * associated to a split-second ago! 1651 */ 1652 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1653 return; 1654 1655 /* Track average RSSI from the Beacon frames of the current AP */ 1656 ifmgd->last_beacon_signal = rx_status->signal; 1657 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1658 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1659 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1660 ifmgd->last_cqm_event_signal = 0; 1661 ifmgd->count_beacon_signal = 1; 1662 } else { 1663 ifmgd->ave_beacon_signal = 1664 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1665 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1666 ifmgd->ave_beacon_signal) / 16; 1667 ifmgd->count_beacon_signal++; 1668 } 1669 if (bss_conf->cqm_rssi_thold && 1670 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1671 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1672 int sig = ifmgd->ave_beacon_signal / 16; 1673 int last_event = ifmgd->last_cqm_event_signal; 1674 int thold = bss_conf->cqm_rssi_thold; 1675 int hyst = bss_conf->cqm_rssi_hyst; 1676 if (sig < thold && 1677 (last_event == 0 || sig < last_event - hyst)) { 1678 ifmgd->last_cqm_event_signal = sig; 1679 ieee80211_cqm_rssi_notify( 1680 &sdata->vif, 1681 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1682 GFP_KERNEL); 1683 } else if (sig > thold && 1684 (last_event == 0 || sig > last_event + hyst)) { 1685 ifmgd->last_cqm_event_signal = sig; 1686 ieee80211_cqm_rssi_notify( 1687 &sdata->vif, 1688 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1689 GFP_KERNEL); 1690 } 1691 } 1692 1693 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1694 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1695 if (net_ratelimit()) { 1696 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1697 "to a received beacon\n", sdata->name); 1698 } 1699 #endif 1700 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1701 mutex_lock(&local->iflist_mtx); 1702 ieee80211_recalc_ps(local, -1); 1703 mutex_unlock(&local->iflist_mtx); 1704 } 1705 1706 /* 1707 * Push the beacon loss detection into the future since 1708 * we are processing a beacon from the AP just now. 1709 */ 1710 ieee80211_sta_reset_beacon_monitor(sdata); 1711 1712 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1713 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1714 len - baselen, &elems, 1715 care_about_ies, ncrc); 1716 1717 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1718 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1719 ifmgd->aid); 1720 1721 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1722 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1723 true); 1724 1725 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1726 elems.wmm_param_len); 1727 } 1728 1729 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1730 if (directed_tim) { 1731 if (local->hw.conf.dynamic_ps_timeout > 0) { 1732 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1733 ieee80211_hw_config(local, 1734 IEEE80211_CONF_CHANGE_PS); 1735 ieee80211_send_nullfunc(local, sdata, 0); 1736 } else { 1737 local->pspolling = true; 1738 1739 /* 1740 * Here is assumed that the driver will be 1741 * able to send ps-poll frame and receive a 1742 * response even though power save mode is 1743 * enabled, but some drivers might require 1744 * to disable power save here. This needs 1745 * to be investigated. 1746 */ 1747 ieee80211_send_pspoll(local, sdata); 1748 } 1749 } 1750 } 1751 1752 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1753 return; 1754 ifmgd->beacon_crc = ncrc; 1755 ifmgd->beacon_crc_valid = true; 1756 1757 if (elems.erp_info && elems.erp_info_len >= 1) { 1758 erp_valid = true; 1759 erp_value = elems.erp_info[0]; 1760 } else { 1761 erp_valid = false; 1762 } 1763 changed |= ieee80211_handle_bss_capability(sdata, 1764 le16_to_cpu(mgmt->u.beacon.capab_info), 1765 erp_valid, erp_value); 1766 1767 1768 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1769 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1770 struct sta_info *sta; 1771 struct ieee80211_supported_band *sband; 1772 u16 ap_ht_cap_flags; 1773 1774 rcu_read_lock(); 1775 1776 sta = sta_info_get(sdata, bssid); 1777 if (WARN_ON(!sta)) { 1778 rcu_read_unlock(); 1779 return; 1780 } 1781 1782 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1783 1784 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1785 elems.ht_cap_elem, &sta->sta.ht_cap); 1786 1787 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1788 1789 rcu_read_unlock(); 1790 1791 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1792 bssid, ap_ht_cap_flags); 1793 } 1794 1795 /* Note: country IE parsing is done for us by cfg80211 */ 1796 if (elems.country_elem) { 1797 /* TODO: IBSS also needs this */ 1798 if (elems.pwr_constr_elem) 1799 ieee80211_handle_pwr_constr(sdata, 1800 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1801 elems.pwr_constr_elem, 1802 elems.pwr_constr_elem_len); 1803 } 1804 1805 ieee80211_bss_info_change_notify(sdata, changed); 1806 } 1807 1808 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1809 struct sk_buff *skb) 1810 { 1811 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1812 struct ieee80211_rx_status *rx_status; 1813 struct ieee80211_mgmt *mgmt; 1814 enum rx_mgmt_action rma = RX_MGMT_NONE; 1815 u16 fc; 1816 1817 rx_status = (struct ieee80211_rx_status *) skb->cb; 1818 mgmt = (struct ieee80211_mgmt *) skb->data; 1819 fc = le16_to_cpu(mgmt->frame_control); 1820 1821 mutex_lock(&ifmgd->mtx); 1822 1823 if (ifmgd->associated && 1824 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1825 switch (fc & IEEE80211_FCTL_STYPE) { 1826 case IEEE80211_STYPE_BEACON: 1827 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1828 rx_status); 1829 break; 1830 case IEEE80211_STYPE_PROBE_RESP: 1831 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1832 break; 1833 case IEEE80211_STYPE_DEAUTH: 1834 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1835 break; 1836 case IEEE80211_STYPE_DISASSOC: 1837 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1838 break; 1839 case IEEE80211_STYPE_ACTION: 1840 switch (mgmt->u.action.category) { 1841 case WLAN_CATEGORY_SPECTRUM_MGMT: 1842 ieee80211_sta_process_chanswitch(sdata, 1843 &mgmt->u.action.u.chan_switch.sw_elem, 1844 (void *)ifmgd->associated->priv, 1845 rx_status->mactime); 1846 break; 1847 } 1848 } 1849 mutex_unlock(&ifmgd->mtx); 1850 1851 switch (rma) { 1852 case RX_MGMT_NONE: 1853 /* no action */ 1854 break; 1855 case RX_MGMT_CFG80211_DEAUTH: 1856 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1857 break; 1858 case RX_MGMT_CFG80211_DISASSOC: 1859 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1860 break; 1861 default: 1862 WARN(1, "unexpected: %d", rma); 1863 } 1864 return; 1865 } 1866 1867 mutex_unlock(&ifmgd->mtx); 1868 1869 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1870 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1871 struct ieee80211_local *local = sdata->local; 1872 struct ieee80211_work *wk; 1873 1874 mutex_lock(&local->mtx); 1875 list_for_each_entry(wk, &local->work_list, list) { 1876 if (wk->sdata != sdata) 1877 continue; 1878 1879 if (wk->type != IEEE80211_WORK_ASSOC && 1880 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1881 continue; 1882 1883 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1884 continue; 1885 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1886 continue; 1887 1888 /* 1889 * Printing the message only here means we can't 1890 * spuriously print it, but it also means that it 1891 * won't be printed when the frame comes in before 1892 * we even tried to associate or in similar cases. 1893 * 1894 * Ultimately, I suspect cfg80211 should print the 1895 * messages instead. 1896 */ 1897 printk(KERN_DEBUG 1898 "%s: deauthenticated from %pM (Reason: %u)\n", 1899 sdata->name, mgmt->bssid, 1900 le16_to_cpu(mgmt->u.deauth.reason_code)); 1901 1902 list_del_rcu(&wk->list); 1903 free_work(wk); 1904 break; 1905 } 1906 mutex_unlock(&local->mtx); 1907 1908 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1909 } 1910 } 1911 1912 static void ieee80211_sta_timer(unsigned long data) 1913 { 1914 struct ieee80211_sub_if_data *sdata = 1915 (struct ieee80211_sub_if_data *) data; 1916 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1917 struct ieee80211_local *local = sdata->local; 1918 1919 if (local->quiescing) { 1920 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1921 return; 1922 } 1923 1924 ieee80211_queue_work(&local->hw, &sdata->work); 1925 } 1926 1927 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 1928 u8 *bssid) 1929 { 1930 struct ieee80211_local *local = sdata->local; 1931 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1932 1933 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1934 IEEE80211_STA_BEACON_POLL); 1935 1936 ieee80211_set_disassoc(sdata, true, true); 1937 mutex_unlock(&ifmgd->mtx); 1938 mutex_lock(&local->mtx); 1939 ieee80211_recalc_idle(local); 1940 mutex_unlock(&local->mtx); 1941 /* 1942 * must be outside lock due to cfg80211, 1943 * but that's not a problem. 1944 */ 1945 ieee80211_send_deauth_disassoc(sdata, bssid, 1946 IEEE80211_STYPE_DEAUTH, 1947 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1948 NULL, true); 1949 mutex_lock(&ifmgd->mtx); 1950 } 1951 1952 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 1953 { 1954 struct ieee80211_local *local = sdata->local; 1955 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1956 1957 /* then process the rest of the work */ 1958 mutex_lock(&ifmgd->mtx); 1959 1960 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1961 IEEE80211_STA_CONNECTION_POLL) && 1962 ifmgd->associated) { 1963 u8 bssid[ETH_ALEN]; 1964 int max_tries; 1965 1966 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1967 1968 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1969 max_tries = IEEE80211_MAX_NULLFUNC_TRIES; 1970 else 1971 max_tries = IEEE80211_MAX_PROBE_TRIES; 1972 1973 /* ACK received for nullfunc probing frame */ 1974 if (!ifmgd->probe_send_count) 1975 ieee80211_reset_ap_probe(sdata); 1976 else if (ifmgd->nullfunc_failed) { 1977 if (ifmgd->probe_send_count < max_tries) { 1978 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1979 wiphy_debug(local->hw.wiphy, 1980 "%s: No ack for nullfunc frame to" 1981 " AP %pM, try %d\n", 1982 sdata->name, bssid, 1983 ifmgd->probe_send_count); 1984 #endif 1985 ieee80211_mgd_probe_ap_send(sdata); 1986 } else { 1987 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1988 wiphy_debug(local->hw.wiphy, 1989 "%s: No ack for nullfunc frame to" 1990 " AP %pM, disconnecting.\n", 1991 sdata->name, bssid); 1992 #endif 1993 ieee80211_sta_connection_lost(sdata, bssid); 1994 } 1995 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 1996 run_again(ifmgd, ifmgd->probe_timeout); 1997 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1998 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1999 wiphy_debug(local->hw.wiphy, 2000 "%s: Failed to send nullfunc to AP %pM" 2001 " after %dms, disconnecting.\n", 2002 sdata->name, 2003 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 2004 #endif 2005 ieee80211_sta_connection_lost(sdata, bssid); 2006 } else if (ifmgd->probe_send_count < max_tries) { 2007 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2008 wiphy_debug(local->hw.wiphy, 2009 "%s: No probe response from AP %pM" 2010 " after %dms, try %d\n", 2011 sdata->name, 2012 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ, 2013 ifmgd->probe_send_count); 2014 #endif 2015 ieee80211_mgd_probe_ap_send(sdata); 2016 } else { 2017 /* 2018 * We actually lost the connection ... or did we? 2019 * Let's make sure! 2020 */ 2021 wiphy_debug(local->hw.wiphy, 2022 "%s: No probe response from AP %pM" 2023 " after %dms, disconnecting.\n", 2024 sdata->name, 2025 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 2026 2027 ieee80211_sta_connection_lost(sdata, bssid); 2028 } 2029 } 2030 2031 mutex_unlock(&ifmgd->mtx); 2032 } 2033 2034 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2035 { 2036 struct ieee80211_sub_if_data *sdata = 2037 (struct ieee80211_sub_if_data *) data; 2038 struct ieee80211_local *local = sdata->local; 2039 2040 if (local->quiescing) 2041 return; 2042 2043 ieee80211_queue_work(&sdata->local->hw, 2044 &sdata->u.mgd.beacon_connection_loss_work); 2045 } 2046 2047 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2048 { 2049 struct ieee80211_sub_if_data *sdata = 2050 (struct ieee80211_sub_if_data *) data; 2051 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2052 struct ieee80211_local *local = sdata->local; 2053 2054 if (local->quiescing) 2055 return; 2056 2057 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2058 } 2059 2060 static void ieee80211_sta_monitor_work(struct work_struct *work) 2061 { 2062 struct ieee80211_sub_if_data *sdata = 2063 container_of(work, struct ieee80211_sub_if_data, 2064 u.mgd.monitor_work); 2065 2066 ieee80211_mgd_probe_ap(sdata, false); 2067 } 2068 2069 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2070 { 2071 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2072 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2073 IEEE80211_STA_CONNECTION_POLL); 2074 2075 /* let's probe the connection once */ 2076 ieee80211_queue_work(&sdata->local->hw, 2077 &sdata->u.mgd.monitor_work); 2078 /* and do all the other regular work too */ 2079 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2080 } 2081 } 2082 2083 #ifdef CONFIG_PM 2084 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2085 { 2086 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2087 2088 /* 2089 * we need to use atomic bitops for the running bits 2090 * only because both timers might fire at the same 2091 * time -- the code here is properly synchronised. 2092 */ 2093 2094 cancel_work_sync(&ifmgd->request_smps_work); 2095 2096 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2097 if (del_timer_sync(&ifmgd->timer)) 2098 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2099 2100 cancel_work_sync(&ifmgd->chswitch_work); 2101 if (del_timer_sync(&ifmgd->chswitch_timer)) 2102 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2103 2104 cancel_work_sync(&ifmgd->monitor_work); 2105 /* these will just be re-established on connection */ 2106 del_timer_sync(&ifmgd->conn_mon_timer); 2107 del_timer_sync(&ifmgd->bcn_mon_timer); 2108 } 2109 2110 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2111 { 2112 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2113 2114 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2115 add_timer(&ifmgd->timer); 2116 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2117 add_timer(&ifmgd->chswitch_timer); 2118 ieee80211_sta_reset_beacon_monitor(sdata); 2119 ieee80211_restart_sta_timer(sdata); 2120 } 2121 #endif 2122 2123 /* interface setup */ 2124 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2125 { 2126 struct ieee80211_if_managed *ifmgd; 2127 2128 ifmgd = &sdata->u.mgd; 2129 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2130 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2131 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2132 ieee80211_beacon_connection_loss_work); 2133 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2134 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2135 (unsigned long) sdata); 2136 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2137 (unsigned long) sdata); 2138 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2139 (unsigned long) sdata); 2140 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2141 (unsigned long) sdata); 2142 2143 ifmgd->flags = 0; 2144 2145 mutex_init(&ifmgd->mtx); 2146 2147 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2148 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2149 else 2150 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2151 } 2152 2153 /* scan finished notification */ 2154 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2155 { 2156 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2157 2158 /* Restart STA timers */ 2159 rcu_read_lock(); 2160 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2161 ieee80211_restart_sta_timer(sdata); 2162 rcu_read_unlock(); 2163 } 2164 2165 int ieee80211_max_network_latency(struct notifier_block *nb, 2166 unsigned long data, void *dummy) 2167 { 2168 s32 latency_usec = (s32) data; 2169 struct ieee80211_local *local = 2170 container_of(nb, struct ieee80211_local, 2171 network_latency_notifier); 2172 2173 mutex_lock(&local->iflist_mtx); 2174 ieee80211_recalc_ps(local, latency_usec); 2175 mutex_unlock(&local->iflist_mtx); 2176 2177 return 0; 2178 } 2179 2180 /* config hooks */ 2181 static enum work_done_result 2182 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2183 struct sk_buff *skb) 2184 { 2185 if (!skb) { 2186 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2187 return WORK_DONE_DESTROY; 2188 } 2189 2190 if (wk->type == IEEE80211_WORK_AUTH) { 2191 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2192 return WORK_DONE_DESTROY; 2193 } 2194 2195 mutex_lock(&wk->sdata->u.mgd.mtx); 2196 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2197 mutex_unlock(&wk->sdata->u.mgd.mtx); 2198 2199 wk->type = IEEE80211_WORK_AUTH; 2200 wk->probe_auth.tries = 0; 2201 return WORK_DONE_REQUEUE; 2202 } 2203 2204 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2205 struct cfg80211_auth_request *req) 2206 { 2207 const u8 *ssid; 2208 struct ieee80211_work *wk; 2209 u16 auth_alg; 2210 2211 if (req->local_state_change) 2212 return 0; /* no need to update mac80211 state */ 2213 2214 switch (req->auth_type) { 2215 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2216 auth_alg = WLAN_AUTH_OPEN; 2217 break; 2218 case NL80211_AUTHTYPE_SHARED_KEY: 2219 if (IS_ERR(sdata->local->wep_tx_tfm)) 2220 return -EOPNOTSUPP; 2221 auth_alg = WLAN_AUTH_SHARED_KEY; 2222 break; 2223 case NL80211_AUTHTYPE_FT: 2224 auth_alg = WLAN_AUTH_FT; 2225 break; 2226 case NL80211_AUTHTYPE_NETWORK_EAP: 2227 auth_alg = WLAN_AUTH_LEAP; 2228 break; 2229 default: 2230 return -EOPNOTSUPP; 2231 } 2232 2233 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2234 if (!wk) 2235 return -ENOMEM; 2236 2237 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2238 2239 if (req->ie && req->ie_len) { 2240 memcpy(wk->ie, req->ie, req->ie_len); 2241 wk->ie_len = req->ie_len; 2242 } 2243 2244 if (req->key && req->key_len) { 2245 wk->probe_auth.key_len = req->key_len; 2246 wk->probe_auth.key_idx = req->key_idx; 2247 memcpy(wk->probe_auth.key, req->key, req->key_len); 2248 } 2249 2250 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2251 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2252 wk->probe_auth.ssid_len = ssid[1]; 2253 2254 wk->probe_auth.algorithm = auth_alg; 2255 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2256 2257 /* if we already have a probe, don't probe again */ 2258 if (req->bss->proberesp_ies) 2259 wk->type = IEEE80211_WORK_AUTH; 2260 else 2261 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2262 wk->chan = req->bss->channel; 2263 wk->sdata = sdata; 2264 wk->done = ieee80211_probe_auth_done; 2265 2266 ieee80211_add_work(wk); 2267 return 0; 2268 } 2269 2270 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2271 struct sk_buff *skb) 2272 { 2273 struct ieee80211_mgmt *mgmt; 2274 struct ieee80211_rx_status *rx_status; 2275 struct ieee802_11_elems elems; 2276 u16 status; 2277 2278 if (!skb) { 2279 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2280 return WORK_DONE_DESTROY; 2281 } 2282 2283 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2284 mutex_lock(&wk->sdata->u.mgd.mtx); 2285 rx_status = (void *) skb->cb; 2286 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2287 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2288 &elems, true); 2289 mutex_unlock(&wk->sdata->u.mgd.mtx); 2290 2291 wk->type = IEEE80211_WORK_ASSOC; 2292 /* not really done yet */ 2293 return WORK_DONE_REQUEUE; 2294 } 2295 2296 mgmt = (void *)skb->data; 2297 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2298 2299 if (status == WLAN_STATUS_SUCCESS) { 2300 mutex_lock(&wk->sdata->u.mgd.mtx); 2301 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2302 mutex_unlock(&wk->sdata->u.mgd.mtx); 2303 /* oops -- internal error -- send timeout for now */ 2304 cfg80211_send_assoc_timeout(wk->sdata->dev, 2305 wk->filter_ta); 2306 return WORK_DONE_DESTROY; 2307 } 2308 2309 mutex_unlock(&wk->sdata->u.mgd.mtx); 2310 } 2311 2312 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2313 return WORK_DONE_DESTROY; 2314 } 2315 2316 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2317 struct cfg80211_assoc_request *req) 2318 { 2319 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2320 struct ieee80211_bss *bss = (void *)req->bss->priv; 2321 struct ieee80211_work *wk; 2322 const u8 *ssid; 2323 int i; 2324 2325 mutex_lock(&ifmgd->mtx); 2326 if (ifmgd->associated) { 2327 if (!req->prev_bssid || 2328 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2329 ETH_ALEN)) { 2330 /* 2331 * We are already associated and the request was not a 2332 * reassociation request from the current BSS, so 2333 * reject it. 2334 */ 2335 mutex_unlock(&ifmgd->mtx); 2336 return -EALREADY; 2337 } 2338 2339 /* Trying to reassociate - clear previous association state */ 2340 ieee80211_set_disassoc(sdata, true, false); 2341 } 2342 mutex_unlock(&ifmgd->mtx); 2343 2344 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2345 if (!wk) 2346 return -ENOMEM; 2347 2348 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2349 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2350 2351 ifmgd->beacon_crc_valid = false; 2352 2353 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2354 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2355 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2356 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2357 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2358 2359 2360 if (req->ie && req->ie_len) { 2361 memcpy(wk->ie, req->ie, req->ie_len); 2362 wk->ie_len = req->ie_len; 2363 } else 2364 wk->ie_len = 0; 2365 2366 wk->assoc.bss = req->bss; 2367 2368 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2369 2370 /* new association always uses requested smps mode */ 2371 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2372 if (ifmgd->powersave) 2373 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2374 else 2375 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2376 } else 2377 ifmgd->ap_smps = ifmgd->req_smps; 2378 2379 wk->assoc.smps = ifmgd->ap_smps; 2380 /* 2381 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2382 * We still associate in non-HT mode (11a/b/g) if any one of these 2383 * ciphers is configured as pairwise. 2384 * We can set this to true for non-11n hardware, that'll be checked 2385 * separately along with the peer capabilities. 2386 */ 2387 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2388 wk->assoc.capability = req->bss->capability; 2389 wk->assoc.wmm_used = bss->wmm_used; 2390 wk->assoc.supp_rates = bss->supp_rates; 2391 wk->assoc.supp_rates_len = bss->supp_rates_len; 2392 wk->assoc.ht_information_ie = 2393 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2394 2395 if (bss->wmm_used && bss->uapsd_supported && 2396 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2397 wk->assoc.uapsd_used = true; 2398 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2399 } else { 2400 wk->assoc.uapsd_used = false; 2401 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2402 } 2403 2404 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2405 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2406 wk->assoc.ssid_len = ssid[1]; 2407 2408 if (req->prev_bssid) 2409 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2410 2411 wk->chan = req->bss->channel; 2412 wk->sdata = sdata; 2413 wk->done = ieee80211_assoc_done; 2414 if (!bss->dtim_period && 2415 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2416 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2417 else 2418 wk->type = IEEE80211_WORK_ASSOC; 2419 2420 if (req->use_mfp) { 2421 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2422 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2423 } else { 2424 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2425 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2426 } 2427 2428 if (req->crypto.control_port) 2429 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2430 else 2431 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2432 2433 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2434 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2435 2436 ieee80211_add_work(wk); 2437 return 0; 2438 } 2439 2440 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2441 struct cfg80211_deauth_request *req, 2442 void *cookie) 2443 { 2444 struct ieee80211_local *local = sdata->local; 2445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2446 struct ieee80211_work *wk; 2447 u8 bssid[ETH_ALEN]; 2448 bool assoc_bss = false; 2449 2450 mutex_lock(&ifmgd->mtx); 2451 2452 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2453 if (ifmgd->associated == req->bss) { 2454 ieee80211_set_disassoc(sdata, false, true); 2455 mutex_unlock(&ifmgd->mtx); 2456 assoc_bss = true; 2457 } else { 2458 bool not_auth_yet = false; 2459 2460 mutex_unlock(&ifmgd->mtx); 2461 2462 mutex_lock(&local->mtx); 2463 list_for_each_entry(wk, &local->work_list, list) { 2464 if (wk->sdata != sdata) 2465 continue; 2466 2467 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2468 wk->type != IEEE80211_WORK_AUTH && 2469 wk->type != IEEE80211_WORK_ASSOC && 2470 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2471 continue; 2472 2473 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2474 continue; 2475 2476 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2477 list_del_rcu(&wk->list); 2478 free_work(wk); 2479 break; 2480 } 2481 mutex_unlock(&local->mtx); 2482 2483 /* 2484 * If somebody requests authentication and we haven't 2485 * sent out an auth frame yet there's no need to send 2486 * out a deauth frame either. If the state was PROBE, 2487 * then this is the case. If it's AUTH we have sent a 2488 * frame, and if it's IDLE we have completed the auth 2489 * process already. 2490 */ 2491 if (not_auth_yet) { 2492 __cfg80211_auth_canceled(sdata->dev, bssid); 2493 return 0; 2494 } 2495 } 2496 2497 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2498 sdata->name, bssid, req->reason_code); 2499 2500 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2501 req->reason_code, cookie, 2502 !req->local_state_change); 2503 if (assoc_bss) 2504 sta_info_destroy_addr(sdata, bssid); 2505 2506 mutex_lock(&sdata->local->mtx); 2507 ieee80211_recalc_idle(sdata->local); 2508 mutex_unlock(&sdata->local->mtx); 2509 2510 return 0; 2511 } 2512 2513 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2514 struct cfg80211_disassoc_request *req, 2515 void *cookie) 2516 { 2517 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2518 u8 bssid[ETH_ALEN]; 2519 2520 mutex_lock(&ifmgd->mtx); 2521 2522 /* 2523 * cfg80211 should catch this ... but it's racy since 2524 * we can receive a disassoc frame, process it, hand it 2525 * to cfg80211 while that's in a locked section already 2526 * trying to tell us that the user wants to disconnect. 2527 */ 2528 if (ifmgd->associated != req->bss) { 2529 mutex_unlock(&ifmgd->mtx); 2530 return -ENOLINK; 2531 } 2532 2533 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2534 sdata->name, req->bss->bssid, req->reason_code); 2535 2536 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2537 ieee80211_set_disassoc(sdata, false, true); 2538 2539 mutex_unlock(&ifmgd->mtx); 2540 2541 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2542 IEEE80211_STYPE_DISASSOC, req->reason_code, 2543 cookie, !req->local_state_change); 2544 sta_info_destroy_addr(sdata, bssid); 2545 2546 mutex_lock(&sdata->local->mtx); 2547 ieee80211_recalc_idle(sdata->local); 2548 mutex_unlock(&sdata->local->mtx); 2549 2550 return 0; 2551 } 2552 2553 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2554 enum nl80211_cqm_rssi_threshold_event rssi_event, 2555 gfp_t gfp) 2556 { 2557 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2558 2559 trace_api_cqm_rssi_notify(sdata, rssi_event); 2560 2561 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2562 } 2563 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2564