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 static int max_nullfunc_tries = 2; 32 module_param(max_nullfunc_tries, int, 0644); 33 MODULE_PARM_DESC(max_nullfunc_tries, 34 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 35 36 static int max_probe_tries = 5; 37 module_param(max_probe_tries, int, 0644); 38 MODULE_PARM_DESC(max_probe_tries, 39 "Maximum probe tries before disconnecting (reason 4)."); 40 41 /* 42 * Beacon loss timeout is calculated as N frames times the 43 * advertised beacon interval. This may need to be somewhat 44 * higher than what hardware might detect to account for 45 * delays in the host processing frames. But since we also 46 * probe on beacon miss before declaring the connection lost 47 * default to what we want. 48 */ 49 #define IEEE80211_BEACON_LOSS_COUNT 7 50 51 /* 52 * Time the connection can be idle before we probe 53 * it to see if we can still talk to the AP. 54 */ 55 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 56 /* 57 * Time we wait for a probe response after sending 58 * a probe request because of beacon loss or for 59 * checking the connection still works. 60 */ 61 static int probe_wait_ms = 500; 62 module_param(probe_wait_ms, int, 0644); 63 MODULE_PARM_DESC(probe_wait_ms, 64 "Maximum time(ms) to wait for probe response" 65 " before disconnecting (reason 4)."); 66 67 /* 68 * Weight given to the latest Beacon frame when calculating average signal 69 * strength for Beacon frames received in the current BSS. This must be 70 * between 1 and 15. 71 */ 72 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 73 74 /* 75 * How many Beacon frames need to have been used in average signal strength 76 * before starting to indicate signal change events. 77 */ 78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 79 80 #define TMR_RUNNING_TIMER 0 81 #define TMR_RUNNING_CHANSW 1 82 83 /* 84 * All cfg80211 functions have to be called outside a locked 85 * section so that they can acquire a lock themselves... This 86 * is much simpler than queuing up things in cfg80211, but we 87 * do need some indirection for that here. 88 */ 89 enum rx_mgmt_action { 90 /* no action required */ 91 RX_MGMT_NONE, 92 93 /* caller must call cfg80211_send_deauth() */ 94 RX_MGMT_CFG80211_DEAUTH, 95 96 /* caller must call cfg80211_send_disassoc() */ 97 RX_MGMT_CFG80211_DISASSOC, 98 }; 99 100 /* utils */ 101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 102 { 103 lockdep_assert_held(&ifmgd->mtx); 104 } 105 106 /* 107 * We can have multiple work items (and connection probing) 108 * scheduling this timer, but we need to take care to only 109 * reschedule it when it should fire _earlier_ than it was 110 * asked for before, or if it's not pending right now. This 111 * function ensures that. Note that it then is required to 112 * run this function for all timeouts after the first one 113 * has happened -- the work that runs from this timer will 114 * do that. 115 */ 116 static void run_again(struct ieee80211_if_managed *ifmgd, 117 unsigned long timeout) 118 { 119 ASSERT_MGD_MTX(ifmgd); 120 121 if (!timer_pending(&ifmgd->timer) || 122 time_before(timeout, ifmgd->timer.expires)) 123 mod_timer(&ifmgd->timer, timeout); 124 } 125 126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 127 { 128 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 129 return; 130 131 mod_timer(&sdata->u.mgd.bcn_mon_timer, 132 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 133 } 134 135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 136 { 137 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 138 139 if (unlikely(!sdata->u.mgd.associated)) 140 return; 141 142 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 143 return; 144 145 mod_timer(&sdata->u.mgd.conn_mon_timer, 146 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 147 148 ifmgd->probe_send_count = 0; 149 } 150 151 static int ecw2cw(int ecw) 152 { 153 return (1 << ecw) - 1; 154 } 155 156 /* 157 * ieee80211_enable_ht should be called only after the operating band 158 * has been determined as ht configuration depends on the hw's 159 * HT abilities for a specific band. 160 */ 161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 162 struct ieee80211_ht_info *hti, 163 const u8 *bssid, u16 ap_ht_cap_flags) 164 { 165 struct ieee80211_local *local = sdata->local; 166 struct ieee80211_supported_band *sband; 167 struct sta_info *sta; 168 u32 changed = 0; 169 int hti_cfreq; 170 u16 ht_opmode; 171 bool enable_ht = true; 172 enum nl80211_channel_type prev_chantype; 173 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 174 175 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 176 177 prev_chantype = sdata->vif.bss_conf.channel_type; 178 179 /* HT is not supported */ 180 if (!sband->ht_cap.ht_supported) 181 enable_ht = false; 182 183 if (enable_ht) { 184 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan, 185 sband->band); 186 /* check that channel matches the right operating channel */ 187 if (local->hw.conf.channel->center_freq != hti_cfreq) { 188 /* Some APs mess this up, evidently. 189 * Netgear WNDR3700 sometimes reports 4 higher than 190 * the actual channel, for instance. 191 */ 192 printk(KERN_DEBUG 193 "%s: Wrong control channel in association" 194 " response: configured center-freq: %d" 195 " hti-cfreq: %d hti->control_chan: %d" 196 " band: %d. Disabling HT.\n", 197 sdata->name, 198 local->hw.conf.channel->center_freq, 199 hti_cfreq, hti->control_chan, 200 sband->band); 201 enable_ht = false; 202 } 203 } 204 205 if (enable_ht) { 206 channel_type = NL80211_CHAN_HT20; 207 208 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 209 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 210 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 211 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 212 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 213 if (!(local->hw.conf.channel->flags & 214 IEEE80211_CHAN_NO_HT40PLUS)) 215 channel_type = NL80211_CHAN_HT40PLUS; 216 break; 217 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 218 if (!(local->hw.conf.channel->flags & 219 IEEE80211_CHAN_NO_HT40MINUS)) 220 channel_type = NL80211_CHAN_HT40MINUS; 221 break; 222 } 223 } 224 } 225 226 if (local->tmp_channel) 227 local->tmp_channel_type = channel_type; 228 229 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 230 /* can only fail due to HT40+/- mismatch */ 231 channel_type = NL80211_CHAN_HT20; 232 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 233 } 234 235 ieee80211_stop_queues_by_reason(&sdata->local->hw, 236 IEEE80211_QUEUE_STOP_REASON_CSA); 237 238 /* channel_type change automatically detected */ 239 ieee80211_hw_config(local, 0); 240 241 if (prev_chantype != channel_type) { 242 rcu_read_lock(); 243 sta = sta_info_get(sdata, bssid); 244 if (sta) 245 rate_control_rate_update(local, sband, sta, 246 IEEE80211_RC_HT_CHANGED, 247 channel_type); 248 rcu_read_unlock(); 249 } 250 251 ieee80211_wake_queues_by_reason(&sdata->local->hw, 252 IEEE80211_QUEUE_STOP_REASON_CSA); 253 254 ht_opmode = le16_to_cpu(hti->operation_mode); 255 256 /* if bss configuration changed store the new one */ 257 if (sdata->ht_opmode_valid != enable_ht || 258 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 259 prev_chantype != channel_type) { 260 changed |= BSS_CHANGED_HT; 261 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 262 sdata->ht_opmode_valid = enable_ht; 263 } 264 265 return changed; 266 } 267 268 /* frame sending functions */ 269 270 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 271 const u8 *bssid, u16 stype, u16 reason, 272 void *cookie, bool send_frame) 273 { 274 struct ieee80211_local *local = sdata->local; 275 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 276 struct sk_buff *skb; 277 struct ieee80211_mgmt *mgmt; 278 279 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 280 if (!skb) { 281 printk(KERN_DEBUG "%s: failed to allocate buffer for " 282 "deauth/disassoc frame\n", sdata->name); 283 return; 284 } 285 skb_reserve(skb, local->hw.extra_tx_headroom); 286 287 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 288 memset(mgmt, 0, 24); 289 memcpy(mgmt->da, bssid, ETH_ALEN); 290 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 291 memcpy(mgmt->bssid, bssid, ETH_ALEN); 292 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 293 skb_put(skb, 2); 294 /* u.deauth.reason_code == u.disassoc.reason_code */ 295 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 296 297 if (stype == IEEE80211_STYPE_DEAUTH) 298 if (cookie) 299 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 300 else 301 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 302 else 303 if (cookie) 304 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 305 else 306 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 307 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 308 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 309 310 if (send_frame) 311 ieee80211_tx_skb(sdata, skb); 312 else 313 kfree_skb(skb); 314 } 315 316 void ieee80211_send_pspoll(struct ieee80211_local *local, 317 struct ieee80211_sub_if_data *sdata) 318 { 319 struct ieee80211_pspoll *pspoll; 320 struct sk_buff *skb; 321 322 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 323 if (!skb) 324 return; 325 326 pspoll = (struct ieee80211_pspoll *) skb->data; 327 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 328 329 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 330 ieee80211_tx_skb(sdata, skb); 331 } 332 333 void ieee80211_send_nullfunc(struct ieee80211_local *local, 334 struct ieee80211_sub_if_data *sdata, 335 int powersave) 336 { 337 struct sk_buff *skb; 338 struct ieee80211_hdr_3addr *nullfunc; 339 340 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 341 if (!skb) 342 return; 343 344 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 345 if (powersave) 346 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 347 348 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 349 ieee80211_tx_skb(sdata, skb); 350 } 351 352 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 353 struct ieee80211_sub_if_data *sdata) 354 { 355 struct sk_buff *skb; 356 struct ieee80211_hdr *nullfunc; 357 __le16 fc; 358 359 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 360 return; 361 362 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 363 if (!skb) { 364 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 365 "nullfunc frame\n", sdata->name); 366 return; 367 } 368 skb_reserve(skb, local->hw.extra_tx_headroom); 369 370 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 371 memset(nullfunc, 0, 30); 372 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 373 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 374 nullfunc->frame_control = fc; 375 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 376 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 377 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 378 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 379 380 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 381 ieee80211_tx_skb(sdata, skb); 382 } 383 384 /* spectrum management related things */ 385 static void ieee80211_chswitch_work(struct work_struct *work) 386 { 387 struct ieee80211_sub_if_data *sdata = 388 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 389 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 390 391 if (!ieee80211_sdata_running(sdata)) 392 return; 393 394 mutex_lock(&ifmgd->mtx); 395 if (!ifmgd->associated) 396 goto out; 397 398 sdata->local->oper_channel = sdata->local->csa_channel; 399 if (!sdata->local->ops->channel_switch) { 400 /* call "hw_config" only if doing sw channel switch */ 401 ieee80211_hw_config(sdata->local, 402 IEEE80211_CONF_CHANGE_CHANNEL); 403 } 404 405 /* XXX: shouldn't really modify cfg80211-owned data! */ 406 ifmgd->associated->channel = sdata->local->oper_channel; 407 408 ieee80211_wake_queues_by_reason(&sdata->local->hw, 409 IEEE80211_QUEUE_STOP_REASON_CSA); 410 out: 411 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 412 mutex_unlock(&ifmgd->mtx); 413 } 414 415 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 416 { 417 struct ieee80211_sub_if_data *sdata; 418 struct ieee80211_if_managed *ifmgd; 419 420 sdata = vif_to_sdata(vif); 421 ifmgd = &sdata->u.mgd; 422 423 trace_api_chswitch_done(sdata, success); 424 if (!success) { 425 /* 426 * If the channel switch was not successful, stay 427 * around on the old channel. We currently lack 428 * good handling of this situation, possibly we 429 * should just drop the association. 430 */ 431 sdata->local->csa_channel = sdata->local->oper_channel; 432 } 433 434 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 435 } 436 EXPORT_SYMBOL(ieee80211_chswitch_done); 437 438 static void ieee80211_chswitch_timer(unsigned long data) 439 { 440 struct ieee80211_sub_if_data *sdata = 441 (struct ieee80211_sub_if_data *) data; 442 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 443 444 if (sdata->local->quiescing) { 445 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 446 return; 447 } 448 449 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 450 } 451 452 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 453 struct ieee80211_channel_sw_ie *sw_elem, 454 struct ieee80211_bss *bss, 455 u64 timestamp) 456 { 457 struct cfg80211_bss *cbss = 458 container_of((void *)bss, struct cfg80211_bss, priv); 459 struct ieee80211_channel *new_ch; 460 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 461 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 462 cbss->channel->band); 463 464 ASSERT_MGD_MTX(ifmgd); 465 466 if (!ifmgd->associated) 467 return; 468 469 if (sdata->local->scanning) 470 return; 471 472 /* Disregard subsequent beacons if we are already running a timer 473 processing a CSA */ 474 475 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 476 return; 477 478 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 479 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 480 return; 481 482 sdata->local->csa_channel = new_ch; 483 484 if (sdata->local->ops->channel_switch) { 485 /* use driver's channel switch callback */ 486 struct ieee80211_channel_switch ch_switch; 487 memset(&ch_switch, 0, sizeof(ch_switch)); 488 ch_switch.timestamp = timestamp; 489 if (sw_elem->mode) { 490 ch_switch.block_tx = true; 491 ieee80211_stop_queues_by_reason(&sdata->local->hw, 492 IEEE80211_QUEUE_STOP_REASON_CSA); 493 } 494 ch_switch.channel = new_ch; 495 ch_switch.count = sw_elem->count; 496 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 497 drv_channel_switch(sdata->local, &ch_switch); 498 return; 499 } 500 501 /* channel switch handled in software */ 502 if (sw_elem->count <= 1) { 503 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 504 } else { 505 if (sw_elem->mode) 506 ieee80211_stop_queues_by_reason(&sdata->local->hw, 507 IEEE80211_QUEUE_STOP_REASON_CSA); 508 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 509 mod_timer(&ifmgd->chswitch_timer, 510 jiffies + 511 msecs_to_jiffies(sw_elem->count * 512 cbss->beacon_interval)); 513 } 514 } 515 516 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 517 u16 capab_info, u8 *pwr_constr_elem, 518 u8 pwr_constr_elem_len) 519 { 520 struct ieee80211_conf *conf = &sdata->local->hw.conf; 521 522 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 523 return; 524 525 /* Power constraint IE length should be 1 octet */ 526 if (pwr_constr_elem_len != 1) 527 return; 528 529 if ((*pwr_constr_elem <= conf->channel->max_power) && 530 (*pwr_constr_elem != sdata->local->power_constr_level)) { 531 sdata->local->power_constr_level = *pwr_constr_elem; 532 ieee80211_hw_config(sdata->local, 0); 533 } 534 } 535 536 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 537 { 538 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 539 struct ieee80211_local *local = sdata->local; 540 struct ieee80211_conf *conf = &local->hw.conf; 541 542 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 543 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 544 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 545 546 local->disable_dynamic_ps = false; 547 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 548 } 549 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 550 551 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 552 { 553 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 554 struct ieee80211_local *local = sdata->local; 555 struct ieee80211_conf *conf = &local->hw.conf; 556 557 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 558 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 559 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 560 561 local->disable_dynamic_ps = true; 562 conf->dynamic_ps_timeout = 0; 563 del_timer_sync(&local->dynamic_ps_timer); 564 ieee80211_queue_work(&local->hw, 565 &local->dynamic_ps_enable_work); 566 } 567 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 568 569 /* powersave */ 570 static void ieee80211_enable_ps(struct ieee80211_local *local, 571 struct ieee80211_sub_if_data *sdata) 572 { 573 struct ieee80211_conf *conf = &local->hw.conf; 574 575 /* 576 * If we are scanning right now then the parameters will 577 * take effect when scan finishes. 578 */ 579 if (local->scanning) 580 return; 581 582 if (conf->dynamic_ps_timeout > 0 && 583 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 584 mod_timer(&local->dynamic_ps_timer, jiffies + 585 msecs_to_jiffies(conf->dynamic_ps_timeout)); 586 } else { 587 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 588 ieee80211_send_nullfunc(local, sdata, 1); 589 590 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 591 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 592 return; 593 594 conf->flags |= IEEE80211_CONF_PS; 595 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 596 } 597 } 598 599 static void ieee80211_change_ps(struct ieee80211_local *local) 600 { 601 struct ieee80211_conf *conf = &local->hw.conf; 602 603 if (local->ps_sdata) { 604 ieee80211_enable_ps(local, local->ps_sdata); 605 } else if (conf->flags & IEEE80211_CONF_PS) { 606 conf->flags &= ~IEEE80211_CONF_PS; 607 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 608 del_timer_sync(&local->dynamic_ps_timer); 609 cancel_work_sync(&local->dynamic_ps_enable_work); 610 } 611 } 612 613 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 614 { 615 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 616 struct sta_info *sta = NULL; 617 u32 sta_flags = 0; 618 619 if (!mgd->powersave) 620 return false; 621 622 if (!mgd->associated) 623 return false; 624 625 if (!mgd->associated->beacon_ies) 626 return false; 627 628 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 629 IEEE80211_STA_CONNECTION_POLL)) 630 return false; 631 632 rcu_read_lock(); 633 sta = sta_info_get(sdata, mgd->bssid); 634 if (sta) 635 sta_flags = get_sta_flags(sta); 636 rcu_read_unlock(); 637 638 if (!(sta_flags & WLAN_STA_AUTHORIZED)) 639 return false; 640 641 return true; 642 } 643 644 /* need to hold RTNL or interface lock */ 645 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 646 { 647 struct ieee80211_sub_if_data *sdata, *found = NULL; 648 int count = 0; 649 int timeout; 650 651 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 652 local->ps_sdata = NULL; 653 return; 654 } 655 656 if (!list_empty(&local->work_list)) { 657 local->ps_sdata = NULL; 658 goto change; 659 } 660 661 list_for_each_entry(sdata, &local->interfaces, list) { 662 if (!ieee80211_sdata_running(sdata)) 663 continue; 664 if (sdata->vif.type == NL80211_IFTYPE_AP) { 665 /* If an AP vif is found, then disable PS 666 * by setting the count to zero thereby setting 667 * ps_sdata to NULL. 668 */ 669 count = 0; 670 break; 671 } 672 if (sdata->vif.type != NL80211_IFTYPE_STATION) 673 continue; 674 found = sdata; 675 count++; 676 } 677 678 if (count == 1 && ieee80211_powersave_allowed(found)) { 679 struct ieee80211_conf *conf = &local->hw.conf; 680 s32 beaconint_us; 681 682 if (latency < 0) 683 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 684 685 beaconint_us = ieee80211_tu_to_usec( 686 found->vif.bss_conf.beacon_int); 687 688 timeout = local->dynamic_ps_forced_timeout; 689 if (timeout < 0) { 690 /* 691 * Go to full PSM if the user configures a very low 692 * latency requirement. 693 * The 2000 second value is there for compatibility 694 * until the PM_QOS_NETWORK_LATENCY is configured 695 * with real values. 696 */ 697 if (latency > (1900 * USEC_PER_MSEC) && 698 latency != (2000 * USEC_PER_SEC)) 699 timeout = 0; 700 else 701 timeout = 100; 702 } 703 local->dynamic_ps_user_timeout = timeout; 704 if (!local->disable_dynamic_ps) 705 conf->dynamic_ps_timeout = 706 local->dynamic_ps_user_timeout; 707 708 if (beaconint_us > latency) { 709 local->ps_sdata = NULL; 710 } else { 711 struct ieee80211_bss *bss; 712 int maxslp = 1; 713 u8 dtimper; 714 715 bss = (void *)found->u.mgd.associated->priv; 716 dtimper = bss->dtim_period; 717 718 /* If the TIM IE is invalid, pretend the value is 1 */ 719 if (!dtimper) 720 dtimper = 1; 721 else if (dtimper > 1) 722 maxslp = min_t(int, dtimper, 723 latency / beaconint_us); 724 725 local->hw.conf.max_sleep_period = maxslp; 726 local->hw.conf.ps_dtim_period = dtimper; 727 local->ps_sdata = found; 728 } 729 } else { 730 local->ps_sdata = NULL; 731 } 732 733 change: 734 ieee80211_change_ps(local); 735 } 736 737 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 738 { 739 struct ieee80211_local *local = 740 container_of(work, struct ieee80211_local, 741 dynamic_ps_disable_work); 742 743 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 744 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 746 } 747 748 ieee80211_wake_queues_by_reason(&local->hw, 749 IEEE80211_QUEUE_STOP_REASON_PS); 750 } 751 752 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 753 { 754 struct ieee80211_local *local = 755 container_of(work, struct ieee80211_local, 756 dynamic_ps_enable_work); 757 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 758 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 759 unsigned long flags; 760 int q; 761 762 /* can only happen when PS was just disabled anyway */ 763 if (!sdata) 764 return; 765 766 if (local->hw.conf.flags & IEEE80211_CONF_PS) 767 return; 768 769 /* 770 * transmission can be stopped by others which leads to 771 * dynamic_ps_timer expiry. Postpond the ps timer if it 772 * is not the actual idle state. 773 */ 774 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 775 for (q = 0; q < local->hw.queues; q++) { 776 if (local->queue_stop_reasons[q]) { 777 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 778 flags); 779 mod_timer(&local->dynamic_ps_timer, jiffies + 780 msecs_to_jiffies( 781 local->hw.conf.dynamic_ps_timeout)); 782 return; 783 } 784 } 785 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 786 787 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 788 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 789 netif_tx_stop_all_queues(sdata->dev); 790 791 if (drv_tx_frames_pending(local)) 792 mod_timer(&local->dynamic_ps_timer, jiffies + 793 msecs_to_jiffies( 794 local->hw.conf.dynamic_ps_timeout)); 795 else { 796 ieee80211_send_nullfunc(local, sdata, 1); 797 /* Flush to get the tx status of nullfunc frame */ 798 drv_flush(local, false); 799 } 800 } 801 802 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 803 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 804 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 805 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 806 local->hw.conf.flags |= IEEE80211_CONF_PS; 807 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 808 } 809 810 netif_tx_wake_all_queues(sdata->dev); 811 } 812 813 void ieee80211_dynamic_ps_timer(unsigned long data) 814 { 815 struct ieee80211_local *local = (void *) data; 816 817 if (local->quiescing || local->suspended) 818 return; 819 820 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 821 } 822 823 /* MLME */ 824 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 825 struct ieee80211_sub_if_data *sdata, 826 u8 *wmm_param, size_t wmm_param_len) 827 { 828 struct ieee80211_tx_queue_params params; 829 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 830 size_t left; 831 int count; 832 u8 *pos, uapsd_queues = 0; 833 834 if (!local->ops->conf_tx) 835 return; 836 837 if (local->hw.queues < 4) 838 return; 839 840 if (!wmm_param) 841 return; 842 843 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 844 return; 845 846 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 847 uapsd_queues = local->uapsd_queues; 848 849 count = wmm_param[6] & 0x0f; 850 if (count == ifmgd->wmm_last_param_set) 851 return; 852 ifmgd->wmm_last_param_set = count; 853 854 pos = wmm_param + 8; 855 left = wmm_param_len - 8; 856 857 memset(¶ms, 0, sizeof(params)); 858 859 local->wmm_acm = 0; 860 for (; left >= 4; left -= 4, pos += 4) { 861 int aci = (pos[0] >> 5) & 0x03; 862 int acm = (pos[0] >> 4) & 0x01; 863 bool uapsd = false; 864 int queue; 865 866 switch (aci) { 867 case 1: /* AC_BK */ 868 queue = 3; 869 if (acm) 870 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 871 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 872 uapsd = true; 873 break; 874 case 2: /* AC_VI */ 875 queue = 1; 876 if (acm) 877 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 878 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 879 uapsd = true; 880 break; 881 case 3: /* AC_VO */ 882 queue = 0; 883 if (acm) 884 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 885 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 886 uapsd = true; 887 break; 888 case 0: /* AC_BE */ 889 default: 890 queue = 2; 891 if (acm) 892 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 893 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 894 uapsd = true; 895 break; 896 } 897 898 params.aifs = pos[0] & 0x0f; 899 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 900 params.cw_min = ecw2cw(pos[1] & 0x0f); 901 params.txop = get_unaligned_le16(pos + 2); 902 params.uapsd = uapsd; 903 904 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 905 wiphy_debug(local->hw.wiphy, 906 "WMM queue=%d aci=%d acm=%d aifs=%d " 907 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 908 queue, aci, acm, 909 params.aifs, params.cw_min, params.cw_max, 910 params.txop, params.uapsd); 911 #endif 912 if (drv_conf_tx(local, queue, ¶ms)) 913 wiphy_debug(local->hw.wiphy, 914 "failed to set TX queue parameters for queue %d\n", 915 queue); 916 } 917 918 /* enable WMM or activate new settings */ 919 sdata->vif.bss_conf.qos = true; 920 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 921 } 922 923 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 924 u16 capab, bool erp_valid, u8 erp) 925 { 926 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 927 u32 changed = 0; 928 bool use_protection; 929 bool use_short_preamble; 930 bool use_short_slot; 931 932 if (erp_valid) { 933 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 934 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 935 } else { 936 use_protection = false; 937 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 938 } 939 940 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 941 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 942 use_short_slot = true; 943 944 if (use_protection != bss_conf->use_cts_prot) { 945 bss_conf->use_cts_prot = use_protection; 946 changed |= BSS_CHANGED_ERP_CTS_PROT; 947 } 948 949 if (use_short_preamble != bss_conf->use_short_preamble) { 950 bss_conf->use_short_preamble = use_short_preamble; 951 changed |= BSS_CHANGED_ERP_PREAMBLE; 952 } 953 954 if (use_short_slot != bss_conf->use_short_slot) { 955 bss_conf->use_short_slot = use_short_slot; 956 changed |= BSS_CHANGED_ERP_SLOT; 957 } 958 959 return changed; 960 } 961 962 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 963 struct cfg80211_bss *cbss, 964 u32 bss_info_changed) 965 { 966 struct ieee80211_bss *bss = (void *)cbss->priv; 967 struct ieee80211_local *local = sdata->local; 968 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 969 970 bss_info_changed |= BSS_CHANGED_ASSOC; 971 /* set timing information */ 972 bss_conf->beacon_int = cbss->beacon_interval; 973 bss_conf->timestamp = cbss->tsf; 974 975 bss_info_changed |= BSS_CHANGED_BEACON_INT; 976 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 977 cbss->capability, bss->has_erp_value, bss->erp_value); 978 979 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 980 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 981 982 sdata->u.mgd.associated = cbss; 983 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 984 985 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 986 987 /* just to be sure */ 988 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 989 IEEE80211_STA_BEACON_POLL); 990 991 ieee80211_led_assoc(local, 1); 992 993 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 994 bss_conf->dtim_period = bss->dtim_period; 995 else 996 bss_conf->dtim_period = 0; 997 998 bss_conf->assoc = 1; 999 /* 1000 * For now just always ask the driver to update the basic rateset 1001 * when we have associated, we aren't checking whether it actually 1002 * changed or not. 1003 */ 1004 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1005 1006 /* And the BSSID changed - we're associated now */ 1007 bss_info_changed |= BSS_CHANGED_BSSID; 1008 1009 /* Tell the driver to monitor connection quality (if supported) */ 1010 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1011 bss_conf->cqm_rssi_thold) 1012 bss_info_changed |= BSS_CHANGED_CQM; 1013 1014 /* Enable ARP filtering */ 1015 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1016 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1017 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1018 } 1019 1020 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1021 1022 mutex_lock(&local->iflist_mtx); 1023 ieee80211_recalc_ps(local, -1); 1024 ieee80211_recalc_smps(local); 1025 mutex_unlock(&local->iflist_mtx); 1026 1027 netif_tx_start_all_queues(sdata->dev); 1028 netif_carrier_on(sdata->dev); 1029 } 1030 1031 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1032 bool remove_sta, bool tx) 1033 { 1034 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1035 struct ieee80211_local *local = sdata->local; 1036 struct sta_info *sta; 1037 u32 changed = 0, config_changed = 0; 1038 u8 bssid[ETH_ALEN]; 1039 1040 ASSERT_MGD_MTX(ifmgd); 1041 1042 if (WARN_ON(!ifmgd->associated)) 1043 return; 1044 1045 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1046 1047 ifmgd->associated = NULL; 1048 memset(ifmgd->bssid, 0, ETH_ALEN); 1049 1050 /* 1051 * we need to commit the associated = NULL change because the 1052 * scan code uses that to determine whether this iface should 1053 * go to/wake up from powersave or not -- and could otherwise 1054 * wake the queues erroneously. 1055 */ 1056 smp_mb(); 1057 1058 /* 1059 * Thus, we can only afterwards stop the queues -- to account 1060 * for the case where another CPU is finishing a scan at this 1061 * time -- we don't want the scan code to enable queues. 1062 */ 1063 1064 netif_tx_stop_all_queues(sdata->dev); 1065 netif_carrier_off(sdata->dev); 1066 1067 mutex_lock(&local->sta_mtx); 1068 sta = sta_info_get(sdata, bssid); 1069 if (sta) { 1070 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 1071 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1072 } 1073 mutex_unlock(&local->sta_mtx); 1074 1075 changed |= ieee80211_reset_erp_info(sdata); 1076 1077 ieee80211_led_assoc(local, 0); 1078 changed |= BSS_CHANGED_ASSOC; 1079 sdata->vif.bss_conf.assoc = false; 1080 1081 ieee80211_set_wmm_default(sdata); 1082 1083 /* channel(_type) changes are handled by ieee80211_hw_config */ 1084 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1085 1086 /* on the next assoc, re-program HT parameters */ 1087 sdata->ht_opmode_valid = false; 1088 1089 local->power_constr_level = 0; 1090 1091 del_timer_sync(&local->dynamic_ps_timer); 1092 cancel_work_sync(&local->dynamic_ps_enable_work); 1093 1094 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1095 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1096 config_changed |= IEEE80211_CONF_CHANGE_PS; 1097 } 1098 local->ps_sdata = NULL; 1099 1100 ieee80211_hw_config(local, config_changed); 1101 1102 /* Disable ARP filtering */ 1103 if (sdata->vif.bss_conf.arp_filter_enabled) { 1104 sdata->vif.bss_conf.arp_filter_enabled = false; 1105 changed |= BSS_CHANGED_ARP_FILTER; 1106 } 1107 1108 /* The BSSID (not really interesting) and HT changed */ 1109 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1110 ieee80211_bss_info_change_notify(sdata, changed); 1111 1112 if (remove_sta) 1113 sta_info_destroy_addr(sdata, bssid); 1114 1115 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1116 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1117 del_timer_sync(&sdata->u.mgd.timer); 1118 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1119 } 1120 1121 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1122 struct ieee80211_hdr *hdr) 1123 { 1124 /* 1125 * We can postpone the mgd.timer whenever receiving unicast frames 1126 * from AP because we know that the connection is working both ways 1127 * at that time. But multicast frames (and hence also beacons) must 1128 * be ignored here, because we need to trigger the timer during 1129 * data idle periods for sending the periodic probe request to the 1130 * AP we're connected to. 1131 */ 1132 if (is_multicast_ether_addr(hdr->addr1)) 1133 return; 1134 1135 ieee80211_sta_reset_conn_monitor(sdata); 1136 } 1137 1138 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1139 { 1140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1141 1142 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1143 IEEE80211_STA_CONNECTION_POLL))) 1144 return; 1145 1146 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1147 IEEE80211_STA_BEACON_POLL); 1148 mutex_lock(&sdata->local->iflist_mtx); 1149 ieee80211_recalc_ps(sdata->local, -1); 1150 mutex_unlock(&sdata->local->iflist_mtx); 1151 1152 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1153 return; 1154 1155 /* 1156 * We've received a probe response, but are not sure whether 1157 * we have or will be receiving any beacons or data, so let's 1158 * schedule the timers again, just in case. 1159 */ 1160 ieee80211_sta_reset_beacon_monitor(sdata); 1161 1162 mod_timer(&ifmgd->conn_mon_timer, 1163 round_jiffies_up(jiffies + 1164 IEEE80211_CONNECTION_IDLE_TIME)); 1165 } 1166 1167 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1168 struct ieee80211_hdr *hdr, bool ack) 1169 { 1170 if (!ieee80211_is_data(hdr->frame_control)) 1171 return; 1172 1173 if (ack) 1174 ieee80211_sta_reset_conn_monitor(sdata); 1175 1176 if (ieee80211_is_nullfunc(hdr->frame_control) && 1177 sdata->u.mgd.probe_send_count > 0) { 1178 if (ack) 1179 sdata->u.mgd.probe_send_count = 0; 1180 else 1181 sdata->u.mgd.nullfunc_failed = true; 1182 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1183 } 1184 } 1185 1186 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1187 { 1188 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1189 const u8 *ssid; 1190 u8 *dst = ifmgd->associated->bssid; 1191 u8 unicast_limit = max(1, max_probe_tries - 3); 1192 1193 /* 1194 * Try sending broadcast probe requests for the last three 1195 * probe requests after the first ones failed since some 1196 * buggy APs only support broadcast probe requests. 1197 */ 1198 if (ifmgd->probe_send_count >= unicast_limit) 1199 dst = NULL; 1200 1201 /* 1202 * When the hardware reports an accurate Tx ACK status, it's 1203 * better to send a nullfunc frame instead of a probe request, 1204 * as it will kick us off the AP quickly if we aren't associated 1205 * anymore. The timeout will be reset if the frame is ACKed by 1206 * the AP. 1207 */ 1208 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1209 ifmgd->nullfunc_failed = false; 1210 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1211 } else { 1212 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1213 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1214 } 1215 1216 ifmgd->probe_send_count++; 1217 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1218 run_again(ifmgd, ifmgd->probe_timeout); 1219 } 1220 1221 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1222 bool beacon) 1223 { 1224 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1225 bool already = false; 1226 1227 if (!ieee80211_sdata_running(sdata)) 1228 return; 1229 1230 if (sdata->local->scanning) 1231 return; 1232 1233 if (sdata->local->tmp_channel) 1234 return; 1235 1236 mutex_lock(&ifmgd->mtx); 1237 1238 if (!ifmgd->associated) 1239 goto out; 1240 1241 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1242 if (beacon && net_ratelimit()) 1243 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1244 "- sending probe request\n", sdata->name); 1245 #endif 1246 1247 /* 1248 * The driver/our work has already reported this event or the 1249 * connection monitoring has kicked in and we have already sent 1250 * a probe request. Or maybe the AP died and the driver keeps 1251 * reporting until we disassociate... 1252 * 1253 * In either case we have to ignore the current call to this 1254 * function (except for setting the correct probe reason bit) 1255 * because otherwise we would reset the timer every time and 1256 * never check whether we received a probe response! 1257 */ 1258 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1259 IEEE80211_STA_CONNECTION_POLL)) 1260 already = true; 1261 1262 if (beacon) 1263 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1264 else 1265 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1266 1267 if (already) 1268 goto out; 1269 1270 mutex_lock(&sdata->local->iflist_mtx); 1271 ieee80211_recalc_ps(sdata->local, -1); 1272 mutex_unlock(&sdata->local->iflist_mtx); 1273 1274 ifmgd->probe_send_count = 0; 1275 ieee80211_mgd_probe_ap_send(sdata); 1276 out: 1277 mutex_unlock(&ifmgd->mtx); 1278 } 1279 1280 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1281 struct ieee80211_vif *vif) 1282 { 1283 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1284 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1285 struct sk_buff *skb; 1286 const u8 *ssid; 1287 1288 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1289 return NULL; 1290 1291 ASSERT_MGD_MTX(ifmgd); 1292 1293 if (!ifmgd->associated) 1294 return NULL; 1295 1296 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1297 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1298 ssid + 2, ssid[1], NULL, 0); 1299 1300 return skb; 1301 } 1302 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1303 1304 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1305 { 1306 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1307 struct ieee80211_local *local = sdata->local; 1308 u8 bssid[ETH_ALEN]; 1309 1310 mutex_lock(&ifmgd->mtx); 1311 if (!ifmgd->associated) { 1312 mutex_unlock(&ifmgd->mtx); 1313 return; 1314 } 1315 1316 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1317 1318 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1319 sdata->name, bssid); 1320 1321 ieee80211_set_disassoc(sdata, true, true); 1322 mutex_unlock(&ifmgd->mtx); 1323 1324 mutex_lock(&local->mtx); 1325 ieee80211_recalc_idle(local); 1326 mutex_unlock(&local->mtx); 1327 /* 1328 * must be outside lock due to cfg80211, 1329 * but that's not a problem. 1330 */ 1331 ieee80211_send_deauth_disassoc(sdata, bssid, 1332 IEEE80211_STYPE_DEAUTH, 1333 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1334 NULL, true); 1335 } 1336 1337 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1338 { 1339 struct ieee80211_sub_if_data *sdata = 1340 container_of(work, struct ieee80211_sub_if_data, 1341 u.mgd.beacon_connection_loss_work); 1342 1343 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1344 __ieee80211_connection_loss(sdata); 1345 else 1346 ieee80211_mgd_probe_ap(sdata, true); 1347 } 1348 1349 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1350 { 1351 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1352 struct ieee80211_hw *hw = &sdata->local->hw; 1353 1354 trace_api_beacon_loss(sdata); 1355 1356 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1357 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1358 } 1359 EXPORT_SYMBOL(ieee80211_beacon_loss); 1360 1361 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1362 { 1363 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1364 struct ieee80211_hw *hw = &sdata->local->hw; 1365 1366 trace_api_connection_loss(sdata); 1367 1368 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1369 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1370 } 1371 EXPORT_SYMBOL(ieee80211_connection_loss); 1372 1373 1374 static enum rx_mgmt_action __must_check 1375 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1376 struct ieee80211_mgmt *mgmt, size_t len) 1377 { 1378 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1379 const u8 *bssid = NULL; 1380 u16 reason_code; 1381 1382 if (len < 24 + 2) 1383 return RX_MGMT_NONE; 1384 1385 ASSERT_MGD_MTX(ifmgd); 1386 1387 bssid = ifmgd->associated->bssid; 1388 1389 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1390 1391 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1392 sdata->name, bssid, reason_code); 1393 1394 ieee80211_set_disassoc(sdata, true, false); 1395 mutex_lock(&sdata->local->mtx); 1396 ieee80211_recalc_idle(sdata->local); 1397 mutex_unlock(&sdata->local->mtx); 1398 1399 return RX_MGMT_CFG80211_DEAUTH; 1400 } 1401 1402 1403 static enum rx_mgmt_action __must_check 1404 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1405 struct ieee80211_mgmt *mgmt, size_t len) 1406 { 1407 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1408 u16 reason_code; 1409 1410 if (len < 24 + 2) 1411 return RX_MGMT_NONE; 1412 1413 ASSERT_MGD_MTX(ifmgd); 1414 1415 if (WARN_ON(!ifmgd->associated)) 1416 return RX_MGMT_NONE; 1417 1418 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1419 return RX_MGMT_NONE; 1420 1421 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1422 1423 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1424 sdata->name, mgmt->sa, reason_code); 1425 1426 ieee80211_set_disassoc(sdata, true, false); 1427 mutex_lock(&sdata->local->mtx); 1428 ieee80211_recalc_idle(sdata->local); 1429 mutex_unlock(&sdata->local->mtx); 1430 return RX_MGMT_CFG80211_DISASSOC; 1431 } 1432 1433 1434 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1435 struct ieee80211_mgmt *mgmt, size_t len) 1436 { 1437 struct ieee80211_sub_if_data *sdata = wk->sdata; 1438 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1439 struct ieee80211_local *local = sdata->local; 1440 struct ieee80211_supported_band *sband; 1441 struct sta_info *sta; 1442 struct cfg80211_bss *cbss = wk->assoc.bss; 1443 u8 *pos; 1444 u32 rates, basic_rates; 1445 u16 capab_info, aid; 1446 struct ieee802_11_elems elems; 1447 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1448 u32 changed = 0; 1449 int i, j, err; 1450 bool have_higher_than_11mbit = false; 1451 u16 ap_ht_cap_flags; 1452 1453 /* AssocResp and ReassocResp have identical structure */ 1454 1455 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1456 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1457 1458 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1459 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1460 "set\n", sdata->name, aid); 1461 aid &= ~(BIT(15) | BIT(14)); 1462 1463 pos = mgmt->u.assoc_resp.variable; 1464 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1465 1466 if (!elems.supp_rates) { 1467 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1468 sdata->name); 1469 return false; 1470 } 1471 1472 ifmgd->aid = aid; 1473 1474 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1475 if (!sta) { 1476 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1477 " the AP\n", sdata->name); 1478 return false; 1479 } 1480 1481 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1482 WLAN_STA_ASSOC_AP); 1483 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1484 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1485 1486 rates = 0; 1487 basic_rates = 0; 1488 sband = local->hw.wiphy->bands[wk->chan->band]; 1489 1490 for (i = 0; i < elems.supp_rates_len; i++) { 1491 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1492 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1493 1494 if (rate > 110) 1495 have_higher_than_11mbit = true; 1496 1497 for (j = 0; j < sband->n_bitrates; j++) { 1498 if (sband->bitrates[j].bitrate == rate) { 1499 rates |= BIT(j); 1500 if (is_basic) 1501 basic_rates |= BIT(j); 1502 break; 1503 } 1504 } 1505 } 1506 1507 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1508 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1509 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1510 1511 if (rate > 110) 1512 have_higher_than_11mbit = true; 1513 1514 for (j = 0; j < sband->n_bitrates; j++) { 1515 if (sband->bitrates[j].bitrate == rate) { 1516 rates |= BIT(j); 1517 if (is_basic) 1518 basic_rates |= BIT(j); 1519 break; 1520 } 1521 } 1522 } 1523 1524 sta->sta.supp_rates[wk->chan->band] = rates; 1525 sdata->vif.bss_conf.basic_rates = basic_rates; 1526 1527 /* cf. IEEE 802.11 9.2.12 */ 1528 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1529 have_higher_than_11mbit) 1530 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1531 else 1532 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1533 1534 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1535 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1536 elems.ht_cap_elem, &sta->sta.ht_cap); 1537 1538 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1539 1540 rate_control_rate_init(sta); 1541 1542 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1543 set_sta_flags(sta, WLAN_STA_MFP); 1544 1545 if (elems.wmm_param) 1546 set_sta_flags(sta, WLAN_STA_WME); 1547 1548 err = sta_info_insert(sta); 1549 sta = NULL; 1550 if (err) { 1551 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1552 " the AP (error %d)\n", sdata->name, err); 1553 return false; 1554 } 1555 1556 /* 1557 * Always handle WMM once after association regardless 1558 * of the first value the AP uses. Setting -1 here has 1559 * that effect because the AP values is an unsigned 1560 * 4-bit value. 1561 */ 1562 ifmgd->wmm_last_param_set = -1; 1563 1564 if (elems.wmm_param) 1565 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1566 elems.wmm_param_len); 1567 else 1568 ieee80211_set_wmm_default(sdata); 1569 1570 local->oper_channel = wk->chan; 1571 1572 if (elems.ht_info_elem && elems.wmm_param && 1573 (sdata->local->hw.queues >= 4) && 1574 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1575 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1576 cbss->bssid, ap_ht_cap_flags); 1577 1578 /* set AID and assoc capability, 1579 * ieee80211_set_associated() will tell the driver */ 1580 bss_conf->aid = aid; 1581 bss_conf->assoc_capability = capab_info; 1582 ieee80211_set_associated(sdata, cbss, changed); 1583 1584 /* 1585 * If we're using 4-addr mode, let the AP know that we're 1586 * doing so, so that it can create the STA VLAN on its side 1587 */ 1588 if (ifmgd->use_4addr) 1589 ieee80211_send_4addr_nullfunc(local, sdata); 1590 1591 /* 1592 * Start timer to probe the connection to the AP now. 1593 * Also start the timer that will detect beacon loss. 1594 */ 1595 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1596 ieee80211_sta_reset_beacon_monitor(sdata); 1597 1598 return true; 1599 } 1600 1601 1602 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1603 struct ieee80211_mgmt *mgmt, 1604 size_t len, 1605 struct ieee80211_rx_status *rx_status, 1606 struct ieee802_11_elems *elems, 1607 bool beacon) 1608 { 1609 struct ieee80211_local *local = sdata->local; 1610 int freq; 1611 struct ieee80211_bss *bss; 1612 struct ieee80211_channel *channel; 1613 bool need_ps = false; 1614 1615 if (sdata->u.mgd.associated) { 1616 bss = (void *)sdata->u.mgd.associated->priv; 1617 /* not previously set so we may need to recalc */ 1618 need_ps = !bss->dtim_period; 1619 } 1620 1621 if (elems->ds_params && elems->ds_params_len == 1) 1622 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1623 rx_status->band); 1624 else 1625 freq = rx_status->freq; 1626 1627 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1628 1629 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1630 return; 1631 1632 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1633 channel, beacon); 1634 if (bss) 1635 ieee80211_rx_bss_put(local, bss); 1636 1637 if (!sdata->u.mgd.associated) 1638 return; 1639 1640 if (need_ps) { 1641 mutex_lock(&local->iflist_mtx); 1642 ieee80211_recalc_ps(local, -1); 1643 mutex_unlock(&local->iflist_mtx); 1644 } 1645 1646 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1647 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1648 ETH_ALEN) == 0)) { 1649 struct ieee80211_channel_sw_ie *sw_elem = 1650 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1651 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1652 bss, rx_status->mactime); 1653 } 1654 } 1655 1656 1657 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1658 struct sk_buff *skb) 1659 { 1660 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1661 struct ieee80211_if_managed *ifmgd; 1662 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1663 size_t baselen, len = skb->len; 1664 struct ieee802_11_elems elems; 1665 1666 ifmgd = &sdata->u.mgd; 1667 1668 ASSERT_MGD_MTX(ifmgd); 1669 1670 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1671 return; /* ignore ProbeResp to foreign address */ 1672 1673 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1674 if (baselen > len) 1675 return; 1676 1677 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1678 &elems); 1679 1680 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1681 1682 if (ifmgd->associated && 1683 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1684 ieee80211_reset_ap_probe(sdata); 1685 } 1686 1687 /* 1688 * This is the canonical list of information elements we care about, 1689 * the filter code also gives us all changes to the Microsoft OUI 1690 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1691 * 1692 * We implement beacon filtering in software since that means we can 1693 * avoid processing the frame here and in cfg80211, and userspace 1694 * will not be able to tell whether the hardware supports it or not. 1695 * 1696 * XXX: This list needs to be dynamic -- userspace needs to be able to 1697 * add items it requires. It also needs to be able to tell us to 1698 * look out for other vendor IEs. 1699 */ 1700 static const u64 care_about_ies = 1701 (1ULL << WLAN_EID_COUNTRY) | 1702 (1ULL << WLAN_EID_ERP_INFO) | 1703 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1704 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1705 (1ULL << WLAN_EID_HT_CAPABILITY) | 1706 (1ULL << WLAN_EID_HT_INFORMATION); 1707 1708 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1709 struct ieee80211_mgmt *mgmt, 1710 size_t len, 1711 struct ieee80211_rx_status *rx_status) 1712 { 1713 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1714 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1715 size_t baselen; 1716 struct ieee802_11_elems elems; 1717 struct ieee80211_local *local = sdata->local; 1718 u32 changed = 0; 1719 bool erp_valid, directed_tim = false; 1720 u8 erp_value = 0; 1721 u32 ncrc; 1722 u8 *bssid; 1723 1724 ASSERT_MGD_MTX(ifmgd); 1725 1726 /* Process beacon from the current BSS */ 1727 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1728 if (baselen > len) 1729 return; 1730 1731 if (rx_status->freq != local->hw.conf.channel->center_freq) 1732 return; 1733 1734 /* 1735 * We might have received a number of frames, among them a 1736 * disassoc frame and a beacon... 1737 */ 1738 if (!ifmgd->associated) 1739 return; 1740 1741 bssid = ifmgd->associated->bssid; 1742 1743 /* 1744 * And in theory even frames from a different AP we were just 1745 * associated to a split-second ago! 1746 */ 1747 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1748 return; 1749 1750 /* Track average RSSI from the Beacon frames of the current AP */ 1751 ifmgd->last_beacon_signal = rx_status->signal; 1752 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1753 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1754 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1755 ifmgd->last_cqm_event_signal = 0; 1756 ifmgd->count_beacon_signal = 1; 1757 } else { 1758 ifmgd->ave_beacon_signal = 1759 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1760 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1761 ifmgd->ave_beacon_signal) / 16; 1762 ifmgd->count_beacon_signal++; 1763 } 1764 if (bss_conf->cqm_rssi_thold && 1765 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1766 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1767 int sig = ifmgd->ave_beacon_signal / 16; 1768 int last_event = ifmgd->last_cqm_event_signal; 1769 int thold = bss_conf->cqm_rssi_thold; 1770 int hyst = bss_conf->cqm_rssi_hyst; 1771 if (sig < thold && 1772 (last_event == 0 || sig < last_event - hyst)) { 1773 ifmgd->last_cqm_event_signal = sig; 1774 ieee80211_cqm_rssi_notify( 1775 &sdata->vif, 1776 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1777 GFP_KERNEL); 1778 } else if (sig > thold && 1779 (last_event == 0 || sig > last_event + hyst)) { 1780 ifmgd->last_cqm_event_signal = sig; 1781 ieee80211_cqm_rssi_notify( 1782 &sdata->vif, 1783 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1784 GFP_KERNEL); 1785 } 1786 } 1787 1788 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1789 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1790 if (net_ratelimit()) { 1791 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1792 "to a received beacon\n", sdata->name); 1793 } 1794 #endif 1795 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1796 mutex_lock(&local->iflist_mtx); 1797 ieee80211_recalc_ps(local, -1); 1798 mutex_unlock(&local->iflist_mtx); 1799 } 1800 1801 /* 1802 * Push the beacon loss detection into the future since 1803 * we are processing a beacon from the AP just now. 1804 */ 1805 ieee80211_sta_reset_beacon_monitor(sdata); 1806 1807 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1808 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1809 len - baselen, &elems, 1810 care_about_ies, ncrc); 1811 1812 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1813 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1814 ifmgd->aid); 1815 1816 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1817 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1818 true); 1819 1820 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1821 elems.wmm_param_len); 1822 } 1823 1824 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1825 if (directed_tim) { 1826 if (local->hw.conf.dynamic_ps_timeout > 0) { 1827 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1828 ieee80211_hw_config(local, 1829 IEEE80211_CONF_CHANGE_PS); 1830 ieee80211_send_nullfunc(local, sdata, 0); 1831 } else { 1832 local->pspolling = true; 1833 1834 /* 1835 * Here is assumed that the driver will be 1836 * able to send ps-poll frame and receive a 1837 * response even though power save mode is 1838 * enabled, but some drivers might require 1839 * to disable power save here. This needs 1840 * to be investigated. 1841 */ 1842 ieee80211_send_pspoll(local, sdata); 1843 } 1844 } 1845 } 1846 1847 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1848 return; 1849 ifmgd->beacon_crc = ncrc; 1850 ifmgd->beacon_crc_valid = true; 1851 1852 if (elems.erp_info && elems.erp_info_len >= 1) { 1853 erp_valid = true; 1854 erp_value = elems.erp_info[0]; 1855 } else { 1856 erp_valid = false; 1857 } 1858 changed |= ieee80211_handle_bss_capability(sdata, 1859 le16_to_cpu(mgmt->u.beacon.capab_info), 1860 erp_valid, erp_value); 1861 1862 1863 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1864 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1865 struct sta_info *sta; 1866 struct ieee80211_supported_band *sband; 1867 u16 ap_ht_cap_flags; 1868 1869 rcu_read_lock(); 1870 1871 sta = sta_info_get(sdata, bssid); 1872 if (WARN_ON(!sta)) { 1873 rcu_read_unlock(); 1874 return; 1875 } 1876 1877 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1878 1879 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1880 elems.ht_cap_elem, &sta->sta.ht_cap); 1881 1882 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1883 1884 rcu_read_unlock(); 1885 1886 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1887 bssid, ap_ht_cap_flags); 1888 } 1889 1890 /* Note: country IE parsing is done for us by cfg80211 */ 1891 if (elems.country_elem) { 1892 /* TODO: IBSS also needs this */ 1893 if (elems.pwr_constr_elem) 1894 ieee80211_handle_pwr_constr(sdata, 1895 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1896 elems.pwr_constr_elem, 1897 elems.pwr_constr_elem_len); 1898 } 1899 1900 ieee80211_bss_info_change_notify(sdata, changed); 1901 } 1902 1903 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1904 struct sk_buff *skb) 1905 { 1906 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1907 struct ieee80211_rx_status *rx_status; 1908 struct ieee80211_mgmt *mgmt; 1909 enum rx_mgmt_action rma = RX_MGMT_NONE; 1910 u16 fc; 1911 1912 rx_status = (struct ieee80211_rx_status *) skb->cb; 1913 mgmt = (struct ieee80211_mgmt *) skb->data; 1914 fc = le16_to_cpu(mgmt->frame_control); 1915 1916 mutex_lock(&ifmgd->mtx); 1917 1918 if (ifmgd->associated && 1919 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1920 switch (fc & IEEE80211_FCTL_STYPE) { 1921 case IEEE80211_STYPE_BEACON: 1922 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1923 rx_status); 1924 break; 1925 case IEEE80211_STYPE_PROBE_RESP: 1926 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1927 break; 1928 case IEEE80211_STYPE_DEAUTH: 1929 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1930 break; 1931 case IEEE80211_STYPE_DISASSOC: 1932 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1933 break; 1934 case IEEE80211_STYPE_ACTION: 1935 switch (mgmt->u.action.category) { 1936 case WLAN_CATEGORY_SPECTRUM_MGMT: 1937 ieee80211_sta_process_chanswitch(sdata, 1938 &mgmt->u.action.u.chan_switch.sw_elem, 1939 (void *)ifmgd->associated->priv, 1940 rx_status->mactime); 1941 break; 1942 } 1943 } 1944 mutex_unlock(&ifmgd->mtx); 1945 1946 switch (rma) { 1947 case RX_MGMT_NONE: 1948 /* no action */ 1949 break; 1950 case RX_MGMT_CFG80211_DEAUTH: 1951 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1952 break; 1953 case RX_MGMT_CFG80211_DISASSOC: 1954 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1955 break; 1956 default: 1957 WARN(1, "unexpected: %d", rma); 1958 } 1959 return; 1960 } 1961 1962 mutex_unlock(&ifmgd->mtx); 1963 1964 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1965 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1966 struct ieee80211_local *local = sdata->local; 1967 struct ieee80211_work *wk; 1968 1969 mutex_lock(&local->mtx); 1970 list_for_each_entry(wk, &local->work_list, list) { 1971 if (wk->sdata != sdata) 1972 continue; 1973 1974 if (wk->type != IEEE80211_WORK_ASSOC && 1975 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1976 continue; 1977 1978 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1979 continue; 1980 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1981 continue; 1982 1983 /* 1984 * Printing the message only here means we can't 1985 * spuriously print it, but it also means that it 1986 * won't be printed when the frame comes in before 1987 * we even tried to associate or in similar cases. 1988 * 1989 * Ultimately, I suspect cfg80211 should print the 1990 * messages instead. 1991 */ 1992 printk(KERN_DEBUG 1993 "%s: deauthenticated from %pM (Reason: %u)\n", 1994 sdata->name, mgmt->bssid, 1995 le16_to_cpu(mgmt->u.deauth.reason_code)); 1996 1997 list_del_rcu(&wk->list); 1998 free_work(wk); 1999 break; 2000 } 2001 mutex_unlock(&local->mtx); 2002 2003 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2004 } 2005 } 2006 2007 static void ieee80211_sta_timer(unsigned long data) 2008 { 2009 struct ieee80211_sub_if_data *sdata = 2010 (struct ieee80211_sub_if_data *) data; 2011 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2012 struct ieee80211_local *local = sdata->local; 2013 2014 if (local->quiescing) { 2015 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2016 return; 2017 } 2018 2019 ieee80211_queue_work(&local->hw, &sdata->work); 2020 } 2021 2022 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2023 u8 *bssid) 2024 { 2025 struct ieee80211_local *local = sdata->local; 2026 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2027 2028 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2029 IEEE80211_STA_BEACON_POLL); 2030 2031 ieee80211_set_disassoc(sdata, true, true); 2032 mutex_unlock(&ifmgd->mtx); 2033 mutex_lock(&local->mtx); 2034 ieee80211_recalc_idle(local); 2035 mutex_unlock(&local->mtx); 2036 /* 2037 * must be outside lock due to cfg80211, 2038 * but that's not a problem. 2039 */ 2040 ieee80211_send_deauth_disassoc(sdata, bssid, 2041 IEEE80211_STYPE_DEAUTH, 2042 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2043 NULL, true); 2044 mutex_lock(&ifmgd->mtx); 2045 } 2046 2047 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2048 { 2049 struct ieee80211_local *local = sdata->local; 2050 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2051 2052 /* then process the rest of the work */ 2053 mutex_lock(&ifmgd->mtx); 2054 2055 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2056 IEEE80211_STA_CONNECTION_POLL) && 2057 ifmgd->associated) { 2058 u8 bssid[ETH_ALEN]; 2059 int max_tries; 2060 2061 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2062 2063 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2064 max_tries = max_nullfunc_tries; 2065 else 2066 max_tries = max_probe_tries; 2067 2068 /* ACK received for nullfunc probing frame */ 2069 if (!ifmgd->probe_send_count) 2070 ieee80211_reset_ap_probe(sdata); 2071 else if (ifmgd->nullfunc_failed) { 2072 if (ifmgd->probe_send_count < max_tries) { 2073 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2074 wiphy_debug(local->hw.wiphy, 2075 "%s: No ack for nullfunc frame to" 2076 " AP %pM, try %d/%i\n", 2077 sdata->name, bssid, 2078 ifmgd->probe_send_count, max_tries); 2079 #endif 2080 ieee80211_mgd_probe_ap_send(sdata); 2081 } else { 2082 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2083 wiphy_debug(local->hw.wiphy, 2084 "%s: No ack for nullfunc frame to" 2085 " AP %pM, disconnecting.\n", 2086 sdata->name, bssid); 2087 #endif 2088 ieee80211_sta_connection_lost(sdata, bssid); 2089 } 2090 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2091 run_again(ifmgd, ifmgd->probe_timeout); 2092 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2093 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2094 wiphy_debug(local->hw.wiphy, 2095 "%s: Failed to send nullfunc to AP %pM" 2096 " after %dms, disconnecting.\n", 2097 sdata->name, 2098 bssid, probe_wait_ms); 2099 #endif 2100 ieee80211_sta_connection_lost(sdata, bssid); 2101 } else if (ifmgd->probe_send_count < max_tries) { 2102 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2103 wiphy_debug(local->hw.wiphy, 2104 "%s: No probe response from AP %pM" 2105 " after %dms, try %d/%i\n", 2106 sdata->name, 2107 bssid, probe_wait_ms, 2108 ifmgd->probe_send_count, max_tries); 2109 #endif 2110 ieee80211_mgd_probe_ap_send(sdata); 2111 } else { 2112 /* 2113 * We actually lost the connection ... or did we? 2114 * Let's make sure! 2115 */ 2116 wiphy_debug(local->hw.wiphy, 2117 "%s: No probe response from AP %pM" 2118 " after %dms, disconnecting.\n", 2119 sdata->name, 2120 bssid, probe_wait_ms); 2121 2122 ieee80211_sta_connection_lost(sdata, bssid); 2123 } 2124 } 2125 2126 mutex_unlock(&ifmgd->mtx); 2127 } 2128 2129 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2130 { 2131 struct ieee80211_sub_if_data *sdata = 2132 (struct ieee80211_sub_if_data *) data; 2133 struct ieee80211_local *local = sdata->local; 2134 2135 if (local->quiescing) 2136 return; 2137 2138 ieee80211_queue_work(&sdata->local->hw, 2139 &sdata->u.mgd.beacon_connection_loss_work); 2140 } 2141 2142 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2143 { 2144 struct ieee80211_sub_if_data *sdata = 2145 (struct ieee80211_sub_if_data *) data; 2146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2147 struct ieee80211_local *local = sdata->local; 2148 2149 if (local->quiescing) 2150 return; 2151 2152 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2153 } 2154 2155 static void ieee80211_sta_monitor_work(struct work_struct *work) 2156 { 2157 struct ieee80211_sub_if_data *sdata = 2158 container_of(work, struct ieee80211_sub_if_data, 2159 u.mgd.monitor_work); 2160 2161 ieee80211_mgd_probe_ap(sdata, false); 2162 } 2163 2164 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2165 { 2166 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2167 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2168 IEEE80211_STA_CONNECTION_POLL); 2169 2170 /* let's probe the connection once */ 2171 ieee80211_queue_work(&sdata->local->hw, 2172 &sdata->u.mgd.monitor_work); 2173 /* and do all the other regular work too */ 2174 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2175 } 2176 } 2177 2178 #ifdef CONFIG_PM 2179 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2180 { 2181 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2182 2183 /* 2184 * we need to use atomic bitops for the running bits 2185 * only because both timers might fire at the same 2186 * time -- the code here is properly synchronised. 2187 */ 2188 2189 cancel_work_sync(&ifmgd->request_smps_work); 2190 2191 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2192 if (del_timer_sync(&ifmgd->timer)) 2193 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2194 2195 cancel_work_sync(&ifmgd->chswitch_work); 2196 if (del_timer_sync(&ifmgd->chswitch_timer)) 2197 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2198 2199 cancel_work_sync(&ifmgd->monitor_work); 2200 /* these will just be re-established on connection */ 2201 del_timer_sync(&ifmgd->conn_mon_timer); 2202 del_timer_sync(&ifmgd->bcn_mon_timer); 2203 } 2204 2205 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2206 { 2207 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2208 2209 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2210 add_timer(&ifmgd->timer); 2211 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2212 add_timer(&ifmgd->chswitch_timer); 2213 ieee80211_sta_reset_beacon_monitor(sdata); 2214 ieee80211_restart_sta_timer(sdata); 2215 } 2216 #endif 2217 2218 /* interface setup */ 2219 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2220 { 2221 struct ieee80211_if_managed *ifmgd; 2222 2223 ifmgd = &sdata->u.mgd; 2224 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2225 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2226 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2227 ieee80211_beacon_connection_loss_work); 2228 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2229 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2230 (unsigned long) sdata); 2231 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2232 (unsigned long) sdata); 2233 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2234 (unsigned long) sdata); 2235 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2236 (unsigned long) sdata); 2237 2238 ifmgd->flags = 0; 2239 2240 mutex_init(&ifmgd->mtx); 2241 2242 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2243 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2244 else 2245 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2246 } 2247 2248 /* scan finished notification */ 2249 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2250 { 2251 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2252 2253 /* Restart STA timers */ 2254 rcu_read_lock(); 2255 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2256 ieee80211_restart_sta_timer(sdata); 2257 rcu_read_unlock(); 2258 } 2259 2260 int ieee80211_max_network_latency(struct notifier_block *nb, 2261 unsigned long data, void *dummy) 2262 { 2263 s32 latency_usec = (s32) data; 2264 struct ieee80211_local *local = 2265 container_of(nb, struct ieee80211_local, 2266 network_latency_notifier); 2267 2268 mutex_lock(&local->iflist_mtx); 2269 ieee80211_recalc_ps(local, latency_usec); 2270 mutex_unlock(&local->iflist_mtx); 2271 2272 return 0; 2273 } 2274 2275 /* config hooks */ 2276 static enum work_done_result 2277 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2278 struct sk_buff *skb) 2279 { 2280 if (!skb) { 2281 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2282 return WORK_DONE_DESTROY; 2283 } 2284 2285 if (wk->type == IEEE80211_WORK_AUTH) { 2286 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2287 return WORK_DONE_DESTROY; 2288 } 2289 2290 mutex_lock(&wk->sdata->u.mgd.mtx); 2291 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2292 mutex_unlock(&wk->sdata->u.mgd.mtx); 2293 2294 wk->type = IEEE80211_WORK_AUTH; 2295 wk->probe_auth.tries = 0; 2296 return WORK_DONE_REQUEUE; 2297 } 2298 2299 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2300 struct cfg80211_auth_request *req) 2301 { 2302 const u8 *ssid; 2303 struct ieee80211_work *wk; 2304 u16 auth_alg; 2305 2306 if (req->local_state_change) 2307 return 0; /* no need to update mac80211 state */ 2308 2309 switch (req->auth_type) { 2310 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2311 auth_alg = WLAN_AUTH_OPEN; 2312 break; 2313 case NL80211_AUTHTYPE_SHARED_KEY: 2314 if (IS_ERR(sdata->local->wep_tx_tfm)) 2315 return -EOPNOTSUPP; 2316 auth_alg = WLAN_AUTH_SHARED_KEY; 2317 break; 2318 case NL80211_AUTHTYPE_FT: 2319 auth_alg = WLAN_AUTH_FT; 2320 break; 2321 case NL80211_AUTHTYPE_NETWORK_EAP: 2322 auth_alg = WLAN_AUTH_LEAP; 2323 break; 2324 default: 2325 return -EOPNOTSUPP; 2326 } 2327 2328 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2329 if (!wk) 2330 return -ENOMEM; 2331 2332 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2333 2334 if (req->ie && req->ie_len) { 2335 memcpy(wk->ie, req->ie, req->ie_len); 2336 wk->ie_len = req->ie_len; 2337 } 2338 2339 if (req->key && req->key_len) { 2340 wk->probe_auth.key_len = req->key_len; 2341 wk->probe_auth.key_idx = req->key_idx; 2342 memcpy(wk->probe_auth.key, req->key, req->key_len); 2343 } 2344 2345 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2346 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2347 wk->probe_auth.ssid_len = ssid[1]; 2348 2349 wk->probe_auth.algorithm = auth_alg; 2350 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2351 2352 /* if we already have a probe, don't probe again */ 2353 if (req->bss->proberesp_ies) 2354 wk->type = IEEE80211_WORK_AUTH; 2355 else 2356 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2357 wk->chan = req->bss->channel; 2358 wk->chan_type = NL80211_CHAN_NO_HT; 2359 wk->sdata = sdata; 2360 wk->done = ieee80211_probe_auth_done; 2361 2362 ieee80211_add_work(wk); 2363 return 0; 2364 } 2365 2366 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2367 struct sk_buff *skb) 2368 { 2369 struct ieee80211_mgmt *mgmt; 2370 struct ieee80211_rx_status *rx_status; 2371 struct ieee802_11_elems elems; 2372 u16 status; 2373 2374 if (!skb) { 2375 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2376 return WORK_DONE_DESTROY; 2377 } 2378 2379 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2380 mutex_lock(&wk->sdata->u.mgd.mtx); 2381 rx_status = (void *) skb->cb; 2382 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2383 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2384 &elems, true); 2385 mutex_unlock(&wk->sdata->u.mgd.mtx); 2386 2387 wk->type = IEEE80211_WORK_ASSOC; 2388 /* not really done yet */ 2389 return WORK_DONE_REQUEUE; 2390 } 2391 2392 mgmt = (void *)skb->data; 2393 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2394 2395 if (status == WLAN_STATUS_SUCCESS) { 2396 mutex_lock(&wk->sdata->u.mgd.mtx); 2397 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2398 mutex_unlock(&wk->sdata->u.mgd.mtx); 2399 /* oops -- internal error -- send timeout for now */ 2400 cfg80211_send_assoc_timeout(wk->sdata->dev, 2401 wk->filter_ta); 2402 return WORK_DONE_DESTROY; 2403 } 2404 2405 mutex_unlock(&wk->sdata->u.mgd.mtx); 2406 } 2407 2408 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2409 return WORK_DONE_DESTROY; 2410 } 2411 2412 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2413 struct cfg80211_assoc_request *req) 2414 { 2415 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2416 struct ieee80211_bss *bss = (void *)req->bss->priv; 2417 struct ieee80211_work *wk; 2418 const u8 *ssid; 2419 int i; 2420 2421 mutex_lock(&ifmgd->mtx); 2422 if (ifmgd->associated) { 2423 if (!req->prev_bssid || 2424 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2425 ETH_ALEN)) { 2426 /* 2427 * We are already associated and the request was not a 2428 * reassociation request from the current BSS, so 2429 * reject it. 2430 */ 2431 mutex_unlock(&ifmgd->mtx); 2432 return -EALREADY; 2433 } 2434 2435 /* Trying to reassociate - clear previous association state */ 2436 ieee80211_set_disassoc(sdata, true, false); 2437 } 2438 mutex_unlock(&ifmgd->mtx); 2439 2440 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2441 if (!wk) 2442 return -ENOMEM; 2443 2444 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2445 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2446 2447 ifmgd->beacon_crc_valid = false; 2448 2449 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2450 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2451 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2452 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2453 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2454 2455 2456 if (req->ie && req->ie_len) { 2457 memcpy(wk->ie, req->ie, req->ie_len); 2458 wk->ie_len = req->ie_len; 2459 } else 2460 wk->ie_len = 0; 2461 2462 wk->assoc.bss = req->bss; 2463 2464 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2465 2466 /* new association always uses requested smps mode */ 2467 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2468 if (ifmgd->powersave) 2469 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2470 else 2471 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2472 } else 2473 ifmgd->ap_smps = ifmgd->req_smps; 2474 2475 wk->assoc.smps = ifmgd->ap_smps; 2476 /* 2477 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2478 * We still associate in non-HT mode (11a/b/g) if any one of these 2479 * ciphers is configured as pairwise. 2480 * We can set this to true for non-11n hardware, that'll be checked 2481 * separately along with the peer capabilities. 2482 */ 2483 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2484 wk->assoc.capability = req->bss->capability; 2485 wk->assoc.wmm_used = bss->wmm_used; 2486 wk->assoc.supp_rates = bss->supp_rates; 2487 wk->assoc.supp_rates_len = bss->supp_rates_len; 2488 wk->assoc.ht_information_ie = 2489 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2490 2491 if (bss->wmm_used && bss->uapsd_supported && 2492 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2493 wk->assoc.uapsd_used = true; 2494 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2495 } else { 2496 wk->assoc.uapsd_used = false; 2497 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2498 } 2499 2500 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2501 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2502 wk->assoc.ssid_len = ssid[1]; 2503 2504 if (req->prev_bssid) 2505 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2506 2507 wk->chan = req->bss->channel; 2508 wk->chan_type = NL80211_CHAN_NO_HT; 2509 wk->sdata = sdata; 2510 wk->done = ieee80211_assoc_done; 2511 if (!bss->dtim_period && 2512 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2513 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2514 else 2515 wk->type = IEEE80211_WORK_ASSOC; 2516 2517 if (req->use_mfp) { 2518 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2519 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2520 } else { 2521 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2522 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2523 } 2524 2525 if (req->crypto.control_port) 2526 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2527 else 2528 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2529 2530 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2531 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2532 2533 ieee80211_add_work(wk); 2534 return 0; 2535 } 2536 2537 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2538 struct cfg80211_deauth_request *req, 2539 void *cookie) 2540 { 2541 struct ieee80211_local *local = sdata->local; 2542 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2543 struct ieee80211_work *wk; 2544 u8 bssid[ETH_ALEN]; 2545 bool assoc_bss = false; 2546 2547 mutex_lock(&ifmgd->mtx); 2548 2549 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2550 if (ifmgd->associated == req->bss) { 2551 ieee80211_set_disassoc(sdata, false, true); 2552 mutex_unlock(&ifmgd->mtx); 2553 assoc_bss = true; 2554 } else { 2555 bool not_auth_yet = false; 2556 2557 mutex_unlock(&ifmgd->mtx); 2558 2559 mutex_lock(&local->mtx); 2560 list_for_each_entry(wk, &local->work_list, list) { 2561 if (wk->sdata != sdata) 2562 continue; 2563 2564 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2565 wk->type != IEEE80211_WORK_AUTH && 2566 wk->type != IEEE80211_WORK_ASSOC && 2567 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2568 continue; 2569 2570 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2571 continue; 2572 2573 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2574 list_del_rcu(&wk->list); 2575 free_work(wk); 2576 break; 2577 } 2578 mutex_unlock(&local->mtx); 2579 2580 /* 2581 * If somebody requests authentication and we haven't 2582 * sent out an auth frame yet there's no need to send 2583 * out a deauth frame either. If the state was PROBE, 2584 * then this is the case. If it's AUTH we have sent a 2585 * frame, and if it's IDLE we have completed the auth 2586 * process already. 2587 */ 2588 if (not_auth_yet) { 2589 __cfg80211_auth_canceled(sdata->dev, bssid); 2590 return 0; 2591 } 2592 } 2593 2594 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2595 sdata->name, bssid, req->reason_code); 2596 2597 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2598 req->reason_code, cookie, 2599 !req->local_state_change); 2600 if (assoc_bss) 2601 sta_info_destroy_addr(sdata, bssid); 2602 2603 mutex_lock(&sdata->local->mtx); 2604 ieee80211_recalc_idle(sdata->local); 2605 mutex_unlock(&sdata->local->mtx); 2606 2607 return 0; 2608 } 2609 2610 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2611 struct cfg80211_disassoc_request *req, 2612 void *cookie) 2613 { 2614 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2615 u8 bssid[ETH_ALEN]; 2616 2617 mutex_lock(&ifmgd->mtx); 2618 2619 /* 2620 * cfg80211 should catch this ... but it's racy since 2621 * we can receive a disassoc frame, process it, hand it 2622 * to cfg80211 while that's in a locked section already 2623 * trying to tell us that the user wants to disconnect. 2624 */ 2625 if (ifmgd->associated != req->bss) { 2626 mutex_unlock(&ifmgd->mtx); 2627 return -ENOLINK; 2628 } 2629 2630 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2631 sdata->name, req->bss->bssid, req->reason_code); 2632 2633 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2634 ieee80211_set_disassoc(sdata, false, true); 2635 2636 mutex_unlock(&ifmgd->mtx); 2637 2638 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2639 IEEE80211_STYPE_DISASSOC, req->reason_code, 2640 cookie, !req->local_state_change); 2641 sta_info_destroy_addr(sdata, bssid); 2642 2643 mutex_lock(&sdata->local->mtx); 2644 ieee80211_recalc_idle(sdata->local); 2645 mutex_unlock(&sdata->local->mtx); 2646 2647 return 0; 2648 } 2649 2650 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2651 enum nl80211_cqm_rssi_threshold_event rssi_event, 2652 gfp_t gfp) 2653 { 2654 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2655 2656 trace_api_cqm_rssi_notify(sdata, rssi_event); 2657 2658 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2659 } 2660 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2661