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 ieee80211_sta_reset_conn_monitor(sdata); 1037 } 1038 1039 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1040 { 1041 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1042 1043 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1044 IEEE80211_STA_CONNECTION_POLL))) 1045 return; 1046 1047 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1048 IEEE80211_STA_BEACON_POLL); 1049 mutex_lock(&sdata->local->iflist_mtx); 1050 ieee80211_recalc_ps(sdata->local, -1); 1051 mutex_unlock(&sdata->local->iflist_mtx); 1052 1053 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1054 return; 1055 1056 /* 1057 * We've received a probe response, but are not sure whether 1058 * we have or will be receiving any beacons or data, so let's 1059 * schedule the timers again, just in case. 1060 */ 1061 ieee80211_sta_reset_beacon_monitor(sdata); 1062 1063 mod_timer(&ifmgd->conn_mon_timer, 1064 round_jiffies_up(jiffies + 1065 IEEE80211_CONNECTION_IDLE_TIME)); 1066 } 1067 1068 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1069 struct ieee80211_hdr *hdr, bool ack) 1070 { 1071 if (!ieee80211_is_data(hdr->frame_control)) 1072 return; 1073 1074 if (ack) 1075 ieee80211_sta_reset_conn_monitor(sdata); 1076 1077 if (ieee80211_is_nullfunc(hdr->frame_control) && 1078 sdata->u.mgd.probe_send_count > 0) { 1079 if (ack) 1080 sdata->u.mgd.probe_send_count = 0; 1081 else 1082 sdata->u.mgd.nullfunc_failed = true; 1083 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1084 } 1085 } 1086 1087 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1088 { 1089 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1090 const u8 *ssid; 1091 u8 *dst = ifmgd->associated->bssid; 1092 u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3); 1093 1094 /* 1095 * Try sending broadcast probe requests for the last three 1096 * probe requests after the first ones failed since some 1097 * buggy APs only support broadcast probe requests. 1098 */ 1099 if (ifmgd->probe_send_count >= unicast_limit) 1100 dst = NULL; 1101 1102 /* 1103 * When the hardware reports an accurate Tx ACK status, it's 1104 * better to send a nullfunc frame instead of a probe request, 1105 * as it will kick us off the AP quickly if we aren't associated 1106 * anymore. The timeout will be reset if the frame is ACKed by 1107 * the AP. 1108 */ 1109 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1110 ifmgd->nullfunc_failed = false; 1111 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1112 } else { 1113 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1114 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1115 } 1116 1117 ifmgd->probe_send_count++; 1118 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT; 1119 run_again(ifmgd, ifmgd->probe_timeout); 1120 } 1121 1122 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1123 bool beacon) 1124 { 1125 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1126 bool already = false; 1127 1128 if (!ieee80211_sdata_running(sdata)) 1129 return; 1130 1131 if (sdata->local->scanning) 1132 return; 1133 1134 if (sdata->local->tmp_channel) 1135 return; 1136 1137 mutex_lock(&ifmgd->mtx); 1138 1139 if (!ifmgd->associated) 1140 goto out; 1141 1142 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1143 if (beacon && net_ratelimit()) 1144 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1145 "- sending probe request\n", sdata->name); 1146 #endif 1147 1148 /* 1149 * The driver/our work has already reported this event or the 1150 * connection monitoring has kicked in and we have already sent 1151 * a probe request. Or maybe the AP died and the driver keeps 1152 * reporting until we disassociate... 1153 * 1154 * In either case we have to ignore the current call to this 1155 * function (except for setting the correct probe reason bit) 1156 * because otherwise we would reset the timer every time and 1157 * never check whether we received a probe response! 1158 */ 1159 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1160 IEEE80211_STA_CONNECTION_POLL)) 1161 already = true; 1162 1163 if (beacon) 1164 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1165 else 1166 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1167 1168 if (already) 1169 goto out; 1170 1171 mutex_lock(&sdata->local->iflist_mtx); 1172 ieee80211_recalc_ps(sdata->local, -1); 1173 mutex_unlock(&sdata->local->iflist_mtx); 1174 1175 ifmgd->probe_send_count = 0; 1176 ieee80211_mgd_probe_ap_send(sdata); 1177 out: 1178 mutex_unlock(&ifmgd->mtx); 1179 } 1180 1181 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1182 struct ieee80211_vif *vif) 1183 { 1184 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1185 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1186 struct sk_buff *skb; 1187 const u8 *ssid; 1188 1189 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1190 return NULL; 1191 1192 ASSERT_MGD_MTX(ifmgd); 1193 1194 if (!ifmgd->associated) 1195 return NULL; 1196 1197 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1198 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1199 ssid + 2, ssid[1], NULL, 0); 1200 1201 return skb; 1202 } 1203 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1204 1205 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1206 { 1207 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1208 struct ieee80211_local *local = sdata->local; 1209 u8 bssid[ETH_ALEN]; 1210 1211 mutex_lock(&ifmgd->mtx); 1212 if (!ifmgd->associated) { 1213 mutex_unlock(&ifmgd->mtx); 1214 return; 1215 } 1216 1217 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1218 1219 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid); 1220 1221 ieee80211_set_disassoc(sdata, true, true); 1222 mutex_unlock(&ifmgd->mtx); 1223 1224 mutex_lock(&local->mtx); 1225 ieee80211_recalc_idle(local); 1226 mutex_unlock(&local->mtx); 1227 /* 1228 * must be outside lock due to cfg80211, 1229 * but that's not a problem. 1230 */ 1231 ieee80211_send_deauth_disassoc(sdata, bssid, 1232 IEEE80211_STYPE_DEAUTH, 1233 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1234 NULL, true); 1235 } 1236 1237 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1238 { 1239 struct ieee80211_sub_if_data *sdata = 1240 container_of(work, struct ieee80211_sub_if_data, 1241 u.mgd.beacon_connection_loss_work); 1242 1243 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1244 __ieee80211_connection_loss(sdata); 1245 else 1246 ieee80211_mgd_probe_ap(sdata, true); 1247 } 1248 1249 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1250 { 1251 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1252 struct ieee80211_hw *hw = &sdata->local->hw; 1253 1254 trace_api_beacon_loss(sdata); 1255 1256 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1257 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1258 } 1259 EXPORT_SYMBOL(ieee80211_beacon_loss); 1260 1261 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1262 { 1263 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1264 struct ieee80211_hw *hw = &sdata->local->hw; 1265 1266 trace_api_connection_loss(sdata); 1267 1268 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1269 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1270 } 1271 EXPORT_SYMBOL(ieee80211_connection_loss); 1272 1273 1274 static enum rx_mgmt_action __must_check 1275 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1276 struct ieee80211_mgmt *mgmt, size_t len) 1277 { 1278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1279 const u8 *bssid = NULL; 1280 u16 reason_code; 1281 1282 if (len < 24 + 2) 1283 return RX_MGMT_NONE; 1284 1285 ASSERT_MGD_MTX(ifmgd); 1286 1287 bssid = ifmgd->associated->bssid; 1288 1289 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1290 1291 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1292 sdata->name, bssid, reason_code); 1293 1294 ieee80211_set_disassoc(sdata, true, false); 1295 mutex_lock(&sdata->local->mtx); 1296 ieee80211_recalc_idle(sdata->local); 1297 mutex_unlock(&sdata->local->mtx); 1298 1299 return RX_MGMT_CFG80211_DEAUTH; 1300 } 1301 1302 1303 static enum rx_mgmt_action __must_check 1304 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1305 struct ieee80211_mgmt *mgmt, size_t len) 1306 { 1307 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1308 u16 reason_code; 1309 1310 if (len < 24 + 2) 1311 return RX_MGMT_NONE; 1312 1313 ASSERT_MGD_MTX(ifmgd); 1314 1315 if (WARN_ON(!ifmgd->associated)) 1316 return RX_MGMT_NONE; 1317 1318 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1319 return RX_MGMT_NONE; 1320 1321 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1322 1323 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1324 sdata->name, mgmt->sa, reason_code); 1325 1326 ieee80211_set_disassoc(sdata, true, false); 1327 mutex_lock(&sdata->local->mtx); 1328 ieee80211_recalc_idle(sdata->local); 1329 mutex_unlock(&sdata->local->mtx); 1330 return RX_MGMT_CFG80211_DISASSOC; 1331 } 1332 1333 1334 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1335 struct ieee80211_mgmt *mgmt, size_t len) 1336 { 1337 struct ieee80211_sub_if_data *sdata = wk->sdata; 1338 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1339 struct ieee80211_local *local = sdata->local; 1340 struct ieee80211_supported_band *sband; 1341 struct sta_info *sta; 1342 struct cfg80211_bss *cbss = wk->assoc.bss; 1343 u8 *pos; 1344 u32 rates, basic_rates; 1345 u16 capab_info, aid; 1346 struct ieee802_11_elems elems; 1347 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1348 u32 changed = 0; 1349 int i, j, err; 1350 bool have_higher_than_11mbit = false; 1351 u16 ap_ht_cap_flags; 1352 1353 /* AssocResp and ReassocResp have identical structure */ 1354 1355 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1356 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1357 1358 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1359 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1360 "set\n", sdata->name, aid); 1361 aid &= ~(BIT(15) | BIT(14)); 1362 1363 pos = mgmt->u.assoc_resp.variable; 1364 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1365 1366 if (!elems.supp_rates) { 1367 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1368 sdata->name); 1369 return false; 1370 } 1371 1372 ifmgd->aid = aid; 1373 1374 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1375 if (!sta) { 1376 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1377 " the AP\n", sdata->name); 1378 return false; 1379 } 1380 1381 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1382 WLAN_STA_ASSOC_AP); 1383 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1384 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1385 1386 rates = 0; 1387 basic_rates = 0; 1388 sband = local->hw.wiphy->bands[wk->chan->band]; 1389 1390 for (i = 0; i < elems.supp_rates_len; i++) { 1391 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1392 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1393 1394 if (rate > 110) 1395 have_higher_than_11mbit = true; 1396 1397 for (j = 0; j < sband->n_bitrates; j++) { 1398 if (sband->bitrates[j].bitrate == rate) { 1399 rates |= BIT(j); 1400 if (is_basic) 1401 basic_rates |= BIT(j); 1402 break; 1403 } 1404 } 1405 } 1406 1407 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1408 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1409 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1410 1411 if (rate > 110) 1412 have_higher_than_11mbit = true; 1413 1414 for (j = 0; j < sband->n_bitrates; j++) { 1415 if (sband->bitrates[j].bitrate == rate) { 1416 rates |= BIT(j); 1417 if (is_basic) 1418 basic_rates |= BIT(j); 1419 break; 1420 } 1421 } 1422 } 1423 1424 sta->sta.supp_rates[wk->chan->band] = rates; 1425 sdata->vif.bss_conf.basic_rates = basic_rates; 1426 1427 /* cf. IEEE 802.11 9.2.12 */ 1428 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1429 have_higher_than_11mbit) 1430 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1431 else 1432 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1433 1434 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1435 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1436 elems.ht_cap_elem, &sta->sta.ht_cap); 1437 1438 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1439 1440 rate_control_rate_init(sta); 1441 1442 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1443 set_sta_flags(sta, WLAN_STA_MFP); 1444 1445 if (elems.wmm_param) 1446 set_sta_flags(sta, WLAN_STA_WME); 1447 1448 err = sta_info_insert(sta); 1449 sta = NULL; 1450 if (err) { 1451 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1452 " the AP (error %d)\n", sdata->name, err); 1453 return false; 1454 } 1455 1456 /* 1457 * Always handle WMM once after association regardless 1458 * of the first value the AP uses. Setting -1 here has 1459 * that effect because the AP values is an unsigned 1460 * 4-bit value. 1461 */ 1462 ifmgd->wmm_last_param_set = -1; 1463 1464 if (elems.wmm_param) 1465 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1466 elems.wmm_param_len); 1467 else 1468 ieee80211_set_wmm_default(sdata); 1469 1470 local->oper_channel = wk->chan; 1471 1472 if (elems.ht_info_elem && elems.wmm_param && 1473 (sdata->local->hw.queues >= 4) && 1474 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1475 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1476 cbss->bssid, ap_ht_cap_flags); 1477 1478 /* set AID and assoc capability, 1479 * ieee80211_set_associated() will tell the driver */ 1480 bss_conf->aid = aid; 1481 bss_conf->assoc_capability = capab_info; 1482 ieee80211_set_associated(sdata, cbss, changed); 1483 1484 /* 1485 * If we're using 4-addr mode, let the AP know that we're 1486 * doing so, so that it can create the STA VLAN on its side 1487 */ 1488 if (ifmgd->use_4addr) 1489 ieee80211_send_4addr_nullfunc(local, sdata); 1490 1491 /* 1492 * Start timer to probe the connection to the AP now. 1493 * Also start the timer that will detect beacon loss. 1494 */ 1495 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1496 ieee80211_sta_reset_beacon_monitor(sdata); 1497 1498 return true; 1499 } 1500 1501 1502 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1503 struct ieee80211_mgmt *mgmt, 1504 size_t len, 1505 struct ieee80211_rx_status *rx_status, 1506 struct ieee802_11_elems *elems, 1507 bool beacon) 1508 { 1509 struct ieee80211_local *local = sdata->local; 1510 int freq; 1511 struct ieee80211_bss *bss; 1512 struct ieee80211_channel *channel; 1513 bool need_ps = false; 1514 1515 if (sdata->u.mgd.associated) { 1516 bss = (void *)sdata->u.mgd.associated->priv; 1517 /* not previously set so we may need to recalc */ 1518 need_ps = !bss->dtim_period; 1519 } 1520 1521 if (elems->ds_params && elems->ds_params_len == 1) 1522 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1523 else 1524 freq = rx_status->freq; 1525 1526 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1527 1528 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1529 return; 1530 1531 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1532 channel, beacon); 1533 if (bss) 1534 ieee80211_rx_bss_put(local, bss); 1535 1536 if (!sdata->u.mgd.associated) 1537 return; 1538 1539 if (need_ps) { 1540 mutex_lock(&local->iflist_mtx); 1541 ieee80211_recalc_ps(local, -1); 1542 mutex_unlock(&local->iflist_mtx); 1543 } 1544 1545 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1546 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1547 ETH_ALEN) == 0)) { 1548 struct ieee80211_channel_sw_ie *sw_elem = 1549 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1550 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1551 bss, rx_status->mactime); 1552 } 1553 } 1554 1555 1556 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1557 struct sk_buff *skb) 1558 { 1559 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1560 struct ieee80211_if_managed *ifmgd; 1561 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1562 size_t baselen, len = skb->len; 1563 struct ieee802_11_elems elems; 1564 1565 ifmgd = &sdata->u.mgd; 1566 1567 ASSERT_MGD_MTX(ifmgd); 1568 1569 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1570 return; /* ignore ProbeResp to foreign address */ 1571 1572 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1573 if (baselen > len) 1574 return; 1575 1576 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1577 &elems); 1578 1579 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1580 1581 if (ifmgd->associated && 1582 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1583 ieee80211_reset_ap_probe(sdata); 1584 } 1585 1586 /* 1587 * This is the canonical list of information elements we care about, 1588 * the filter code also gives us all changes to the Microsoft OUI 1589 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1590 * 1591 * We implement beacon filtering in software since that means we can 1592 * avoid processing the frame here and in cfg80211, and userspace 1593 * will not be able to tell whether the hardware supports it or not. 1594 * 1595 * XXX: This list needs to be dynamic -- userspace needs to be able to 1596 * add items it requires. It also needs to be able to tell us to 1597 * look out for other vendor IEs. 1598 */ 1599 static const u64 care_about_ies = 1600 (1ULL << WLAN_EID_COUNTRY) | 1601 (1ULL << WLAN_EID_ERP_INFO) | 1602 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1603 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1604 (1ULL << WLAN_EID_HT_CAPABILITY) | 1605 (1ULL << WLAN_EID_HT_INFORMATION); 1606 1607 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1608 struct ieee80211_mgmt *mgmt, 1609 size_t len, 1610 struct ieee80211_rx_status *rx_status) 1611 { 1612 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1613 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1614 size_t baselen; 1615 struct ieee802_11_elems elems; 1616 struct ieee80211_local *local = sdata->local; 1617 u32 changed = 0; 1618 bool erp_valid, directed_tim = false; 1619 u8 erp_value = 0; 1620 u32 ncrc; 1621 u8 *bssid; 1622 1623 ASSERT_MGD_MTX(ifmgd); 1624 1625 /* Process beacon from the current BSS */ 1626 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1627 if (baselen > len) 1628 return; 1629 1630 if (rx_status->freq != local->hw.conf.channel->center_freq) 1631 return; 1632 1633 /* 1634 * We might have received a number of frames, among them a 1635 * disassoc frame and a beacon... 1636 */ 1637 if (!ifmgd->associated) 1638 return; 1639 1640 bssid = ifmgd->associated->bssid; 1641 1642 /* 1643 * And in theory even frames from a different AP we were just 1644 * associated to a split-second ago! 1645 */ 1646 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1647 return; 1648 1649 /* Track average RSSI from the Beacon frames of the current AP */ 1650 ifmgd->last_beacon_signal = rx_status->signal; 1651 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1652 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1653 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1654 ifmgd->last_cqm_event_signal = 0; 1655 ifmgd->count_beacon_signal = 1; 1656 } else { 1657 ifmgd->ave_beacon_signal = 1658 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1659 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1660 ifmgd->ave_beacon_signal) / 16; 1661 ifmgd->count_beacon_signal++; 1662 } 1663 if (bss_conf->cqm_rssi_thold && 1664 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1665 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1666 int sig = ifmgd->ave_beacon_signal / 16; 1667 int last_event = ifmgd->last_cqm_event_signal; 1668 int thold = bss_conf->cqm_rssi_thold; 1669 int hyst = bss_conf->cqm_rssi_hyst; 1670 if (sig < thold && 1671 (last_event == 0 || sig < last_event - hyst)) { 1672 ifmgd->last_cqm_event_signal = sig; 1673 ieee80211_cqm_rssi_notify( 1674 &sdata->vif, 1675 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1676 GFP_KERNEL); 1677 } else if (sig > thold && 1678 (last_event == 0 || sig > last_event + hyst)) { 1679 ifmgd->last_cqm_event_signal = sig; 1680 ieee80211_cqm_rssi_notify( 1681 &sdata->vif, 1682 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1683 GFP_KERNEL); 1684 } 1685 } 1686 1687 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1689 if (net_ratelimit()) { 1690 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1691 "to a received beacon\n", sdata->name); 1692 } 1693 #endif 1694 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1695 mutex_lock(&local->iflist_mtx); 1696 ieee80211_recalc_ps(local, -1); 1697 mutex_unlock(&local->iflist_mtx); 1698 } 1699 1700 /* 1701 * Push the beacon loss detection into the future since 1702 * we are processing a beacon from the AP just now. 1703 */ 1704 ieee80211_sta_reset_beacon_monitor(sdata); 1705 1706 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1707 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1708 len - baselen, &elems, 1709 care_about_ies, ncrc); 1710 1711 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1712 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1713 ifmgd->aid); 1714 1715 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1716 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1717 true); 1718 1719 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1720 elems.wmm_param_len); 1721 } 1722 1723 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1724 if (directed_tim) { 1725 if (local->hw.conf.dynamic_ps_timeout > 0) { 1726 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1727 ieee80211_hw_config(local, 1728 IEEE80211_CONF_CHANGE_PS); 1729 ieee80211_send_nullfunc(local, sdata, 0); 1730 } else { 1731 local->pspolling = true; 1732 1733 /* 1734 * Here is assumed that the driver will be 1735 * able to send ps-poll frame and receive a 1736 * response even though power save mode is 1737 * enabled, but some drivers might require 1738 * to disable power save here. This needs 1739 * to be investigated. 1740 */ 1741 ieee80211_send_pspoll(local, sdata); 1742 } 1743 } 1744 } 1745 1746 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1747 return; 1748 ifmgd->beacon_crc = ncrc; 1749 ifmgd->beacon_crc_valid = true; 1750 1751 if (elems.erp_info && elems.erp_info_len >= 1) { 1752 erp_valid = true; 1753 erp_value = elems.erp_info[0]; 1754 } else { 1755 erp_valid = false; 1756 } 1757 changed |= ieee80211_handle_bss_capability(sdata, 1758 le16_to_cpu(mgmt->u.beacon.capab_info), 1759 erp_valid, erp_value); 1760 1761 1762 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1763 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1764 struct sta_info *sta; 1765 struct ieee80211_supported_band *sband; 1766 u16 ap_ht_cap_flags; 1767 1768 rcu_read_lock(); 1769 1770 sta = sta_info_get(sdata, bssid); 1771 if (WARN_ON(!sta)) { 1772 rcu_read_unlock(); 1773 return; 1774 } 1775 1776 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1777 1778 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1779 elems.ht_cap_elem, &sta->sta.ht_cap); 1780 1781 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1782 1783 rcu_read_unlock(); 1784 1785 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1786 bssid, ap_ht_cap_flags); 1787 } 1788 1789 /* Note: country IE parsing is done for us by cfg80211 */ 1790 if (elems.country_elem) { 1791 /* TODO: IBSS also needs this */ 1792 if (elems.pwr_constr_elem) 1793 ieee80211_handle_pwr_constr(sdata, 1794 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1795 elems.pwr_constr_elem, 1796 elems.pwr_constr_elem_len); 1797 } 1798 1799 ieee80211_bss_info_change_notify(sdata, changed); 1800 } 1801 1802 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1803 struct sk_buff *skb) 1804 { 1805 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1806 struct ieee80211_rx_status *rx_status; 1807 struct ieee80211_mgmt *mgmt; 1808 enum rx_mgmt_action rma = RX_MGMT_NONE; 1809 u16 fc; 1810 1811 rx_status = (struct ieee80211_rx_status *) skb->cb; 1812 mgmt = (struct ieee80211_mgmt *) skb->data; 1813 fc = le16_to_cpu(mgmt->frame_control); 1814 1815 mutex_lock(&ifmgd->mtx); 1816 1817 if (ifmgd->associated && 1818 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1819 switch (fc & IEEE80211_FCTL_STYPE) { 1820 case IEEE80211_STYPE_BEACON: 1821 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1822 rx_status); 1823 break; 1824 case IEEE80211_STYPE_PROBE_RESP: 1825 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1826 break; 1827 case IEEE80211_STYPE_DEAUTH: 1828 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1829 break; 1830 case IEEE80211_STYPE_DISASSOC: 1831 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1832 break; 1833 case IEEE80211_STYPE_ACTION: 1834 switch (mgmt->u.action.category) { 1835 case WLAN_CATEGORY_SPECTRUM_MGMT: 1836 ieee80211_sta_process_chanswitch(sdata, 1837 &mgmt->u.action.u.chan_switch.sw_elem, 1838 (void *)ifmgd->associated->priv, 1839 rx_status->mactime); 1840 break; 1841 } 1842 } 1843 mutex_unlock(&ifmgd->mtx); 1844 1845 switch (rma) { 1846 case RX_MGMT_NONE: 1847 /* no action */ 1848 break; 1849 case RX_MGMT_CFG80211_DEAUTH: 1850 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1851 break; 1852 case RX_MGMT_CFG80211_DISASSOC: 1853 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1854 break; 1855 default: 1856 WARN(1, "unexpected: %d", rma); 1857 } 1858 return; 1859 } 1860 1861 mutex_unlock(&ifmgd->mtx); 1862 1863 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1864 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1865 struct ieee80211_local *local = sdata->local; 1866 struct ieee80211_work *wk; 1867 1868 mutex_lock(&local->mtx); 1869 list_for_each_entry(wk, &local->work_list, list) { 1870 if (wk->sdata != sdata) 1871 continue; 1872 1873 if (wk->type != IEEE80211_WORK_ASSOC && 1874 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1875 continue; 1876 1877 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1878 continue; 1879 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1880 continue; 1881 1882 /* 1883 * Printing the message only here means we can't 1884 * spuriously print it, but it also means that it 1885 * won't be printed when the frame comes in before 1886 * we even tried to associate or in similar cases. 1887 * 1888 * Ultimately, I suspect cfg80211 should print the 1889 * messages instead. 1890 */ 1891 printk(KERN_DEBUG 1892 "%s: deauthenticated from %pM (Reason: %u)\n", 1893 sdata->name, mgmt->bssid, 1894 le16_to_cpu(mgmt->u.deauth.reason_code)); 1895 1896 list_del_rcu(&wk->list); 1897 free_work(wk); 1898 break; 1899 } 1900 mutex_unlock(&local->mtx); 1901 1902 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1903 } 1904 } 1905 1906 static void ieee80211_sta_timer(unsigned long data) 1907 { 1908 struct ieee80211_sub_if_data *sdata = 1909 (struct ieee80211_sub_if_data *) data; 1910 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1911 struct ieee80211_local *local = sdata->local; 1912 1913 if (local->quiescing) { 1914 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1915 return; 1916 } 1917 1918 ieee80211_queue_work(&local->hw, &sdata->work); 1919 } 1920 1921 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 1922 u8 *bssid) 1923 { 1924 struct ieee80211_local *local = sdata->local; 1925 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1926 1927 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1928 IEEE80211_STA_BEACON_POLL); 1929 1930 ieee80211_set_disassoc(sdata, true, true); 1931 mutex_unlock(&ifmgd->mtx); 1932 mutex_lock(&local->mtx); 1933 ieee80211_recalc_idle(local); 1934 mutex_unlock(&local->mtx); 1935 /* 1936 * must be outside lock due to cfg80211, 1937 * but that's not a problem. 1938 */ 1939 ieee80211_send_deauth_disassoc(sdata, bssid, 1940 IEEE80211_STYPE_DEAUTH, 1941 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1942 NULL, true); 1943 mutex_lock(&ifmgd->mtx); 1944 } 1945 1946 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 1947 { 1948 struct ieee80211_local *local = sdata->local; 1949 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1950 1951 /* then process the rest of the work */ 1952 mutex_lock(&ifmgd->mtx); 1953 1954 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1955 IEEE80211_STA_CONNECTION_POLL) && 1956 ifmgd->associated) { 1957 u8 bssid[ETH_ALEN]; 1958 int max_tries; 1959 1960 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1961 1962 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1963 max_tries = IEEE80211_MAX_NULLFUNC_TRIES; 1964 else 1965 max_tries = IEEE80211_MAX_PROBE_TRIES; 1966 1967 /* ACK received for nullfunc probing frame */ 1968 if (!ifmgd->probe_send_count) 1969 ieee80211_reset_ap_probe(sdata); 1970 else if (ifmgd->nullfunc_failed) { 1971 if (ifmgd->probe_send_count < max_tries) { 1972 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1973 wiphy_debug(local->hw.wiphy, 1974 "%s: No ack for nullfunc frame to" 1975 " AP %pM, try %d\n", 1976 sdata->name, bssid, 1977 ifmgd->probe_send_count); 1978 #endif 1979 ieee80211_mgd_probe_ap_send(sdata); 1980 } else { 1981 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1982 wiphy_debug(local->hw.wiphy, 1983 "%s: No ack for nullfunc frame to" 1984 " AP %pM, disconnecting.\n", 1985 sdata->name, bssid); 1986 #endif 1987 ieee80211_sta_connection_lost(sdata, bssid); 1988 } 1989 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 1990 run_again(ifmgd, ifmgd->probe_timeout); 1991 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1992 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1993 wiphy_debug(local->hw.wiphy, 1994 "%s: Failed to send nullfunc to AP %pM" 1995 " after %dms, disconnecting.\n", 1996 sdata->name, 1997 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 1998 #endif 1999 ieee80211_sta_connection_lost(sdata, bssid); 2000 } else if (ifmgd->probe_send_count < max_tries) { 2001 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2002 wiphy_debug(local->hw.wiphy, 2003 "%s: No probe response from AP %pM" 2004 " after %dms, try %d\n", 2005 sdata->name, 2006 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ, 2007 ifmgd->probe_send_count); 2008 #endif 2009 ieee80211_mgd_probe_ap_send(sdata); 2010 } else { 2011 /* 2012 * We actually lost the connection ... or did we? 2013 * Let's make sure! 2014 */ 2015 wiphy_debug(local->hw.wiphy, 2016 "%s: No probe response from AP %pM" 2017 " after %dms, disconnecting.\n", 2018 sdata->name, 2019 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 2020 2021 ieee80211_sta_connection_lost(sdata, bssid); 2022 } 2023 } 2024 2025 mutex_unlock(&ifmgd->mtx); 2026 } 2027 2028 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2029 { 2030 struct ieee80211_sub_if_data *sdata = 2031 (struct ieee80211_sub_if_data *) data; 2032 struct ieee80211_local *local = sdata->local; 2033 2034 if (local->quiescing) 2035 return; 2036 2037 ieee80211_queue_work(&sdata->local->hw, 2038 &sdata->u.mgd.beacon_connection_loss_work); 2039 } 2040 2041 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2042 { 2043 struct ieee80211_sub_if_data *sdata = 2044 (struct ieee80211_sub_if_data *) data; 2045 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2046 struct ieee80211_local *local = sdata->local; 2047 2048 if (local->quiescing) 2049 return; 2050 2051 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2052 } 2053 2054 static void ieee80211_sta_monitor_work(struct work_struct *work) 2055 { 2056 struct ieee80211_sub_if_data *sdata = 2057 container_of(work, struct ieee80211_sub_if_data, 2058 u.mgd.monitor_work); 2059 2060 ieee80211_mgd_probe_ap(sdata, false); 2061 } 2062 2063 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2064 { 2065 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2066 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2067 IEEE80211_STA_CONNECTION_POLL); 2068 2069 /* let's probe the connection once */ 2070 ieee80211_queue_work(&sdata->local->hw, 2071 &sdata->u.mgd.monitor_work); 2072 /* and do all the other regular work too */ 2073 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2074 } 2075 } 2076 2077 #ifdef CONFIG_PM 2078 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2079 { 2080 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2081 2082 /* 2083 * we need to use atomic bitops for the running bits 2084 * only because both timers might fire at the same 2085 * time -- the code here is properly synchronised. 2086 */ 2087 2088 cancel_work_sync(&ifmgd->request_smps_work); 2089 2090 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2091 if (del_timer_sync(&ifmgd->timer)) 2092 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2093 2094 cancel_work_sync(&ifmgd->chswitch_work); 2095 if (del_timer_sync(&ifmgd->chswitch_timer)) 2096 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2097 2098 cancel_work_sync(&ifmgd->monitor_work); 2099 /* these will just be re-established on connection */ 2100 del_timer_sync(&ifmgd->conn_mon_timer); 2101 del_timer_sync(&ifmgd->bcn_mon_timer); 2102 } 2103 2104 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2105 { 2106 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2107 2108 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2109 add_timer(&ifmgd->timer); 2110 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2111 add_timer(&ifmgd->chswitch_timer); 2112 ieee80211_sta_reset_beacon_monitor(sdata); 2113 ieee80211_restart_sta_timer(sdata); 2114 } 2115 #endif 2116 2117 /* interface setup */ 2118 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2119 { 2120 struct ieee80211_if_managed *ifmgd; 2121 2122 ifmgd = &sdata->u.mgd; 2123 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2124 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2125 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2126 ieee80211_beacon_connection_loss_work); 2127 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2128 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2129 (unsigned long) sdata); 2130 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2131 (unsigned long) sdata); 2132 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2133 (unsigned long) sdata); 2134 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2135 (unsigned long) sdata); 2136 2137 ifmgd->flags = 0; 2138 2139 mutex_init(&ifmgd->mtx); 2140 2141 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2142 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2143 else 2144 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2145 } 2146 2147 /* scan finished notification */ 2148 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2149 { 2150 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2151 2152 /* Restart STA timers */ 2153 rcu_read_lock(); 2154 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2155 ieee80211_restart_sta_timer(sdata); 2156 rcu_read_unlock(); 2157 } 2158 2159 int ieee80211_max_network_latency(struct notifier_block *nb, 2160 unsigned long data, void *dummy) 2161 { 2162 s32 latency_usec = (s32) data; 2163 struct ieee80211_local *local = 2164 container_of(nb, struct ieee80211_local, 2165 network_latency_notifier); 2166 2167 mutex_lock(&local->iflist_mtx); 2168 ieee80211_recalc_ps(local, latency_usec); 2169 mutex_unlock(&local->iflist_mtx); 2170 2171 return 0; 2172 } 2173 2174 /* config hooks */ 2175 static enum work_done_result 2176 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2177 struct sk_buff *skb) 2178 { 2179 if (!skb) { 2180 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2181 return WORK_DONE_DESTROY; 2182 } 2183 2184 if (wk->type == IEEE80211_WORK_AUTH) { 2185 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2186 return WORK_DONE_DESTROY; 2187 } 2188 2189 mutex_lock(&wk->sdata->u.mgd.mtx); 2190 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2191 mutex_unlock(&wk->sdata->u.mgd.mtx); 2192 2193 wk->type = IEEE80211_WORK_AUTH; 2194 wk->probe_auth.tries = 0; 2195 return WORK_DONE_REQUEUE; 2196 } 2197 2198 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2199 struct cfg80211_auth_request *req) 2200 { 2201 const u8 *ssid; 2202 struct ieee80211_work *wk; 2203 u16 auth_alg; 2204 2205 if (req->local_state_change) 2206 return 0; /* no need to update mac80211 state */ 2207 2208 switch (req->auth_type) { 2209 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2210 auth_alg = WLAN_AUTH_OPEN; 2211 break; 2212 case NL80211_AUTHTYPE_SHARED_KEY: 2213 if (IS_ERR(sdata->local->wep_tx_tfm)) 2214 return -EOPNOTSUPP; 2215 auth_alg = WLAN_AUTH_SHARED_KEY; 2216 break; 2217 case NL80211_AUTHTYPE_FT: 2218 auth_alg = WLAN_AUTH_FT; 2219 break; 2220 case NL80211_AUTHTYPE_NETWORK_EAP: 2221 auth_alg = WLAN_AUTH_LEAP; 2222 break; 2223 default: 2224 return -EOPNOTSUPP; 2225 } 2226 2227 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2228 if (!wk) 2229 return -ENOMEM; 2230 2231 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2232 2233 if (req->ie && req->ie_len) { 2234 memcpy(wk->ie, req->ie, req->ie_len); 2235 wk->ie_len = req->ie_len; 2236 } 2237 2238 if (req->key && req->key_len) { 2239 wk->probe_auth.key_len = req->key_len; 2240 wk->probe_auth.key_idx = req->key_idx; 2241 memcpy(wk->probe_auth.key, req->key, req->key_len); 2242 } 2243 2244 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2245 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2246 wk->probe_auth.ssid_len = ssid[1]; 2247 2248 wk->probe_auth.algorithm = auth_alg; 2249 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2250 2251 /* if we already have a probe, don't probe again */ 2252 if (req->bss->proberesp_ies) 2253 wk->type = IEEE80211_WORK_AUTH; 2254 else 2255 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2256 wk->chan = req->bss->channel; 2257 wk->sdata = sdata; 2258 wk->done = ieee80211_probe_auth_done; 2259 2260 ieee80211_add_work(wk); 2261 return 0; 2262 } 2263 2264 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2265 struct sk_buff *skb) 2266 { 2267 struct ieee80211_mgmt *mgmt; 2268 struct ieee80211_rx_status *rx_status; 2269 struct ieee802_11_elems elems; 2270 u16 status; 2271 2272 if (!skb) { 2273 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2274 return WORK_DONE_DESTROY; 2275 } 2276 2277 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2278 mutex_lock(&wk->sdata->u.mgd.mtx); 2279 rx_status = (void *) skb->cb; 2280 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2281 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2282 &elems, true); 2283 mutex_unlock(&wk->sdata->u.mgd.mtx); 2284 2285 wk->type = IEEE80211_WORK_ASSOC; 2286 /* not really done yet */ 2287 return WORK_DONE_REQUEUE; 2288 } 2289 2290 mgmt = (void *)skb->data; 2291 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2292 2293 if (status == WLAN_STATUS_SUCCESS) { 2294 mutex_lock(&wk->sdata->u.mgd.mtx); 2295 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2296 mutex_unlock(&wk->sdata->u.mgd.mtx); 2297 /* oops -- internal error -- send timeout for now */ 2298 cfg80211_send_assoc_timeout(wk->sdata->dev, 2299 wk->filter_ta); 2300 return WORK_DONE_DESTROY; 2301 } 2302 2303 mutex_unlock(&wk->sdata->u.mgd.mtx); 2304 } 2305 2306 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2307 return WORK_DONE_DESTROY; 2308 } 2309 2310 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2311 struct cfg80211_assoc_request *req) 2312 { 2313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2314 struct ieee80211_bss *bss = (void *)req->bss->priv; 2315 struct ieee80211_work *wk; 2316 const u8 *ssid; 2317 int i; 2318 2319 mutex_lock(&ifmgd->mtx); 2320 if (ifmgd->associated) { 2321 if (!req->prev_bssid || 2322 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2323 ETH_ALEN)) { 2324 /* 2325 * We are already associated and the request was not a 2326 * reassociation request from the current BSS, so 2327 * reject it. 2328 */ 2329 mutex_unlock(&ifmgd->mtx); 2330 return -EALREADY; 2331 } 2332 2333 /* Trying to reassociate - clear previous association state */ 2334 ieee80211_set_disassoc(sdata, true, false); 2335 } 2336 mutex_unlock(&ifmgd->mtx); 2337 2338 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2339 if (!wk) 2340 return -ENOMEM; 2341 2342 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2343 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2344 2345 ifmgd->beacon_crc_valid = false; 2346 2347 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2348 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2349 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2350 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2351 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2352 2353 2354 if (req->ie && req->ie_len) { 2355 memcpy(wk->ie, req->ie, req->ie_len); 2356 wk->ie_len = req->ie_len; 2357 } else 2358 wk->ie_len = 0; 2359 2360 wk->assoc.bss = req->bss; 2361 2362 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2363 2364 /* new association always uses requested smps mode */ 2365 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2366 if (ifmgd->powersave) 2367 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2368 else 2369 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2370 } else 2371 ifmgd->ap_smps = ifmgd->req_smps; 2372 2373 wk->assoc.smps = ifmgd->ap_smps; 2374 /* 2375 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2376 * We still associate in non-HT mode (11a/b/g) if any one of these 2377 * ciphers is configured as pairwise. 2378 * We can set this to true for non-11n hardware, that'll be checked 2379 * separately along with the peer capabilities. 2380 */ 2381 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2382 wk->assoc.capability = req->bss->capability; 2383 wk->assoc.wmm_used = bss->wmm_used; 2384 wk->assoc.supp_rates = bss->supp_rates; 2385 wk->assoc.supp_rates_len = bss->supp_rates_len; 2386 wk->assoc.ht_information_ie = 2387 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2388 2389 if (bss->wmm_used && bss->uapsd_supported && 2390 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2391 wk->assoc.uapsd_used = true; 2392 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2393 } else { 2394 wk->assoc.uapsd_used = false; 2395 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2396 } 2397 2398 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2399 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2400 wk->assoc.ssid_len = ssid[1]; 2401 2402 if (req->prev_bssid) 2403 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2404 2405 wk->chan = req->bss->channel; 2406 wk->sdata = sdata; 2407 wk->done = ieee80211_assoc_done; 2408 if (!bss->dtim_period && 2409 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2410 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2411 else 2412 wk->type = IEEE80211_WORK_ASSOC; 2413 2414 if (req->use_mfp) { 2415 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2416 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2417 } else { 2418 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2419 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2420 } 2421 2422 if (req->crypto.control_port) 2423 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2424 else 2425 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2426 2427 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2428 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2429 2430 ieee80211_add_work(wk); 2431 return 0; 2432 } 2433 2434 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2435 struct cfg80211_deauth_request *req, 2436 void *cookie) 2437 { 2438 struct ieee80211_local *local = sdata->local; 2439 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2440 struct ieee80211_work *wk; 2441 u8 bssid[ETH_ALEN]; 2442 bool assoc_bss = false; 2443 2444 mutex_lock(&ifmgd->mtx); 2445 2446 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2447 if (ifmgd->associated == req->bss) { 2448 ieee80211_set_disassoc(sdata, false, true); 2449 mutex_unlock(&ifmgd->mtx); 2450 assoc_bss = true; 2451 } else { 2452 bool not_auth_yet = false; 2453 2454 mutex_unlock(&ifmgd->mtx); 2455 2456 mutex_lock(&local->mtx); 2457 list_for_each_entry(wk, &local->work_list, list) { 2458 if (wk->sdata != sdata) 2459 continue; 2460 2461 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2462 wk->type != IEEE80211_WORK_AUTH && 2463 wk->type != IEEE80211_WORK_ASSOC && 2464 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2465 continue; 2466 2467 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2468 continue; 2469 2470 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2471 list_del_rcu(&wk->list); 2472 free_work(wk); 2473 break; 2474 } 2475 mutex_unlock(&local->mtx); 2476 2477 /* 2478 * If somebody requests authentication and we haven't 2479 * sent out an auth frame yet there's no need to send 2480 * out a deauth frame either. If the state was PROBE, 2481 * then this is the case. If it's AUTH we have sent a 2482 * frame, and if it's IDLE we have completed the auth 2483 * process already. 2484 */ 2485 if (not_auth_yet) { 2486 __cfg80211_auth_canceled(sdata->dev, bssid); 2487 return 0; 2488 } 2489 } 2490 2491 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2492 sdata->name, bssid, req->reason_code); 2493 2494 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2495 req->reason_code, cookie, 2496 !req->local_state_change); 2497 if (assoc_bss) 2498 sta_info_destroy_addr(sdata, bssid); 2499 2500 mutex_lock(&sdata->local->mtx); 2501 ieee80211_recalc_idle(sdata->local); 2502 mutex_unlock(&sdata->local->mtx); 2503 2504 return 0; 2505 } 2506 2507 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2508 struct cfg80211_disassoc_request *req, 2509 void *cookie) 2510 { 2511 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2512 u8 bssid[ETH_ALEN]; 2513 2514 mutex_lock(&ifmgd->mtx); 2515 2516 /* 2517 * cfg80211 should catch this ... but it's racy since 2518 * we can receive a disassoc frame, process it, hand it 2519 * to cfg80211 while that's in a locked section already 2520 * trying to tell us that the user wants to disconnect. 2521 */ 2522 if (ifmgd->associated != req->bss) { 2523 mutex_unlock(&ifmgd->mtx); 2524 return -ENOLINK; 2525 } 2526 2527 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2528 sdata->name, req->bss->bssid, req->reason_code); 2529 2530 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2531 ieee80211_set_disassoc(sdata, false, true); 2532 2533 mutex_unlock(&ifmgd->mtx); 2534 2535 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2536 IEEE80211_STYPE_DISASSOC, req->reason_code, 2537 cookie, !req->local_state_change); 2538 sta_info_destroy_addr(sdata, bssid); 2539 2540 mutex_lock(&sdata->local->mtx); 2541 ieee80211_recalc_idle(sdata->local); 2542 mutex_unlock(&sdata->local->mtx); 2543 2544 return 0; 2545 } 2546 2547 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2548 enum nl80211_cqm_rssi_threshold_event rssi_event, 2549 gfp_t gfp) 2550 { 2551 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2552 2553 trace_api_cqm_rssi_notify(sdata, rssi_event); 2554 2555 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2556 } 2557 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2558