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 /* channel_type change automatically detected */ 236 ieee80211_hw_config(local, 0); 237 238 if (prev_chantype != channel_type) { 239 rcu_read_lock(); 240 sta = sta_info_get(sdata, bssid); 241 if (sta) 242 rate_control_rate_update(local, sband, sta, 243 IEEE80211_RC_HT_CHANGED, 244 channel_type); 245 rcu_read_unlock(); 246 } 247 248 ht_opmode = le16_to_cpu(hti->operation_mode); 249 250 /* if bss configuration changed store the new one */ 251 if (sdata->ht_opmode_valid != enable_ht || 252 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 253 prev_chantype != channel_type) { 254 changed |= BSS_CHANGED_HT; 255 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 256 sdata->ht_opmode_valid = enable_ht; 257 } 258 259 return changed; 260 } 261 262 /* frame sending functions */ 263 264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 265 const u8 *bssid, u16 stype, u16 reason, 266 void *cookie, bool send_frame) 267 { 268 struct ieee80211_local *local = sdata->local; 269 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 270 struct sk_buff *skb; 271 struct ieee80211_mgmt *mgmt; 272 273 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 274 if (!skb) { 275 printk(KERN_DEBUG "%s: failed to allocate buffer for " 276 "deauth/disassoc frame\n", sdata->name); 277 return; 278 } 279 skb_reserve(skb, local->hw.extra_tx_headroom); 280 281 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 282 memset(mgmt, 0, 24); 283 memcpy(mgmt->da, bssid, ETH_ALEN); 284 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 285 memcpy(mgmt->bssid, bssid, ETH_ALEN); 286 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 287 skb_put(skb, 2); 288 /* u.deauth.reason_code == u.disassoc.reason_code */ 289 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 290 291 if (stype == IEEE80211_STYPE_DEAUTH) 292 if (cookie) 293 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 294 else 295 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 296 else 297 if (cookie) 298 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 299 else 300 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 301 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 302 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 303 304 if (send_frame) 305 ieee80211_tx_skb(sdata, skb); 306 else 307 kfree_skb(skb); 308 } 309 310 void ieee80211_send_pspoll(struct ieee80211_local *local, 311 struct ieee80211_sub_if_data *sdata) 312 { 313 struct ieee80211_pspoll *pspoll; 314 struct sk_buff *skb; 315 316 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 317 if (!skb) 318 return; 319 320 pspoll = (struct ieee80211_pspoll *) skb->data; 321 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 322 323 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 324 ieee80211_tx_skb(sdata, skb); 325 } 326 327 void ieee80211_send_nullfunc(struct ieee80211_local *local, 328 struct ieee80211_sub_if_data *sdata, 329 int powersave) 330 { 331 struct sk_buff *skb; 332 struct ieee80211_hdr_3addr *nullfunc; 333 334 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 335 if (!skb) 336 return; 337 338 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 339 if (powersave) 340 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 341 342 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 343 ieee80211_tx_skb(sdata, skb); 344 } 345 346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 347 struct ieee80211_sub_if_data *sdata) 348 { 349 struct sk_buff *skb; 350 struct ieee80211_hdr *nullfunc; 351 __le16 fc; 352 353 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 354 return; 355 356 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 357 if (!skb) { 358 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 359 "nullfunc frame\n", sdata->name); 360 return; 361 } 362 skb_reserve(skb, local->hw.extra_tx_headroom); 363 364 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 365 memset(nullfunc, 0, 30); 366 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 367 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 368 nullfunc->frame_control = fc; 369 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 370 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 371 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 372 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 373 374 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 375 ieee80211_tx_skb(sdata, skb); 376 } 377 378 /* spectrum management related things */ 379 static void ieee80211_chswitch_work(struct work_struct *work) 380 { 381 struct ieee80211_sub_if_data *sdata = 382 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 383 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 384 385 if (!ieee80211_sdata_running(sdata)) 386 return; 387 388 mutex_lock(&ifmgd->mtx); 389 if (!ifmgd->associated) 390 goto out; 391 392 sdata->local->oper_channel = sdata->local->csa_channel; 393 if (!sdata->local->ops->channel_switch) { 394 /* call "hw_config" only if doing sw channel switch */ 395 ieee80211_hw_config(sdata->local, 396 IEEE80211_CONF_CHANGE_CHANNEL); 397 } 398 399 /* XXX: shouldn't really modify cfg80211-owned data! */ 400 ifmgd->associated->channel = sdata->local->oper_channel; 401 402 ieee80211_wake_queues_by_reason(&sdata->local->hw, 403 IEEE80211_QUEUE_STOP_REASON_CSA); 404 out: 405 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 406 mutex_unlock(&ifmgd->mtx); 407 } 408 409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 410 { 411 struct ieee80211_sub_if_data *sdata; 412 struct ieee80211_if_managed *ifmgd; 413 414 sdata = vif_to_sdata(vif); 415 ifmgd = &sdata->u.mgd; 416 417 trace_api_chswitch_done(sdata, success); 418 if (!success) { 419 /* 420 * If the channel switch was not successful, stay 421 * around on the old channel. We currently lack 422 * good handling of this situation, possibly we 423 * should just drop the association. 424 */ 425 sdata->local->csa_channel = sdata->local->oper_channel; 426 } 427 428 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 429 } 430 EXPORT_SYMBOL(ieee80211_chswitch_done); 431 432 static void ieee80211_chswitch_timer(unsigned long data) 433 { 434 struct ieee80211_sub_if_data *sdata = 435 (struct ieee80211_sub_if_data *) data; 436 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 437 438 if (sdata->local->quiescing) { 439 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 440 return; 441 } 442 443 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 444 } 445 446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 447 struct ieee80211_channel_sw_ie *sw_elem, 448 struct ieee80211_bss *bss, 449 u64 timestamp) 450 { 451 struct cfg80211_bss *cbss = 452 container_of((void *)bss, struct cfg80211_bss, priv); 453 struct ieee80211_channel *new_ch; 454 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 455 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 456 cbss->channel->band); 457 458 ASSERT_MGD_MTX(ifmgd); 459 460 if (!ifmgd->associated) 461 return; 462 463 if (sdata->local->scanning) 464 return; 465 466 /* Disregard subsequent beacons if we are already running a timer 467 processing a CSA */ 468 469 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 470 return; 471 472 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 473 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 474 return; 475 476 sdata->local->csa_channel = new_ch; 477 478 if (sdata->local->ops->channel_switch) { 479 /* use driver's channel switch callback */ 480 struct ieee80211_channel_switch ch_switch; 481 memset(&ch_switch, 0, sizeof(ch_switch)); 482 ch_switch.timestamp = timestamp; 483 if (sw_elem->mode) { 484 ch_switch.block_tx = true; 485 ieee80211_stop_queues_by_reason(&sdata->local->hw, 486 IEEE80211_QUEUE_STOP_REASON_CSA); 487 } 488 ch_switch.channel = new_ch; 489 ch_switch.count = sw_elem->count; 490 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 491 drv_channel_switch(sdata->local, &ch_switch); 492 return; 493 } 494 495 /* channel switch handled in software */ 496 if (sw_elem->count <= 1) { 497 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 498 } else { 499 if (sw_elem->mode) 500 ieee80211_stop_queues_by_reason(&sdata->local->hw, 501 IEEE80211_QUEUE_STOP_REASON_CSA); 502 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 503 mod_timer(&ifmgd->chswitch_timer, 504 jiffies + 505 msecs_to_jiffies(sw_elem->count * 506 cbss->beacon_interval)); 507 } 508 } 509 510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 511 u16 capab_info, u8 *pwr_constr_elem, 512 u8 pwr_constr_elem_len) 513 { 514 struct ieee80211_conf *conf = &sdata->local->hw.conf; 515 516 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 517 return; 518 519 /* Power constraint IE length should be 1 octet */ 520 if (pwr_constr_elem_len != 1) 521 return; 522 523 if ((*pwr_constr_elem <= conf->channel->max_power) && 524 (*pwr_constr_elem != sdata->local->power_constr_level)) { 525 sdata->local->power_constr_level = *pwr_constr_elem; 526 ieee80211_hw_config(sdata->local, 0); 527 } 528 } 529 530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 531 { 532 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 533 struct ieee80211_local *local = sdata->local; 534 struct ieee80211_conf *conf = &local->hw.conf; 535 536 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 537 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 538 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 539 540 local->disable_dynamic_ps = false; 541 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 542 } 543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 544 545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 546 { 547 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 548 struct ieee80211_local *local = sdata->local; 549 struct ieee80211_conf *conf = &local->hw.conf; 550 551 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 552 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 553 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 554 555 local->disable_dynamic_ps = true; 556 conf->dynamic_ps_timeout = 0; 557 del_timer_sync(&local->dynamic_ps_timer); 558 ieee80211_queue_work(&local->hw, 559 &local->dynamic_ps_enable_work); 560 } 561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 562 563 /* powersave */ 564 static void ieee80211_enable_ps(struct ieee80211_local *local, 565 struct ieee80211_sub_if_data *sdata) 566 { 567 struct ieee80211_conf *conf = &local->hw.conf; 568 569 /* 570 * If we are scanning right now then the parameters will 571 * take effect when scan finishes. 572 */ 573 if (local->scanning) 574 return; 575 576 if (conf->dynamic_ps_timeout > 0 && 577 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 578 mod_timer(&local->dynamic_ps_timer, jiffies + 579 msecs_to_jiffies(conf->dynamic_ps_timeout)); 580 } else { 581 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 582 ieee80211_send_nullfunc(local, sdata, 1); 583 584 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 585 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 586 return; 587 588 conf->flags |= IEEE80211_CONF_PS; 589 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 590 } 591 } 592 593 static void ieee80211_change_ps(struct ieee80211_local *local) 594 { 595 struct ieee80211_conf *conf = &local->hw.conf; 596 597 if (local->ps_sdata) { 598 ieee80211_enable_ps(local, local->ps_sdata); 599 } else if (conf->flags & IEEE80211_CONF_PS) { 600 conf->flags &= ~IEEE80211_CONF_PS; 601 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 602 del_timer_sync(&local->dynamic_ps_timer); 603 cancel_work_sync(&local->dynamic_ps_enable_work); 604 } 605 } 606 607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 608 { 609 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 610 struct sta_info *sta = NULL; 611 u32 sta_flags = 0; 612 613 if (!mgd->powersave) 614 return false; 615 616 if (!mgd->associated) 617 return false; 618 619 if (!mgd->associated->beacon_ies) 620 return false; 621 622 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 623 IEEE80211_STA_CONNECTION_POLL)) 624 return false; 625 626 rcu_read_lock(); 627 sta = sta_info_get(sdata, mgd->bssid); 628 if (sta) 629 sta_flags = get_sta_flags(sta); 630 rcu_read_unlock(); 631 632 if (!(sta_flags & WLAN_STA_AUTHORIZED)) 633 return false; 634 635 return true; 636 } 637 638 /* need to hold RTNL or interface lock */ 639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 640 { 641 struct ieee80211_sub_if_data *sdata, *found = NULL; 642 int count = 0; 643 int timeout; 644 645 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 646 local->ps_sdata = NULL; 647 return; 648 } 649 650 if (!list_empty(&local->work_list)) { 651 local->ps_sdata = NULL; 652 goto change; 653 } 654 655 list_for_each_entry(sdata, &local->interfaces, list) { 656 if (!ieee80211_sdata_running(sdata)) 657 continue; 658 if (sdata->vif.type == NL80211_IFTYPE_AP) { 659 /* If an AP vif is found, then disable PS 660 * by setting the count to zero thereby setting 661 * ps_sdata to NULL. 662 */ 663 count = 0; 664 break; 665 } 666 if (sdata->vif.type != NL80211_IFTYPE_STATION) 667 continue; 668 found = sdata; 669 count++; 670 } 671 672 if (count == 1 && ieee80211_powersave_allowed(found)) { 673 struct ieee80211_conf *conf = &local->hw.conf; 674 s32 beaconint_us; 675 676 if (latency < 0) 677 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 678 679 beaconint_us = ieee80211_tu_to_usec( 680 found->vif.bss_conf.beacon_int); 681 682 timeout = local->dynamic_ps_forced_timeout; 683 if (timeout < 0) { 684 /* 685 * Go to full PSM if the user configures a very low 686 * latency requirement. 687 * The 2000 second value is there for compatibility 688 * until the PM_QOS_NETWORK_LATENCY is configured 689 * with real values. 690 */ 691 if (latency > (1900 * USEC_PER_MSEC) && 692 latency != (2000 * USEC_PER_SEC)) 693 timeout = 0; 694 else 695 timeout = 100; 696 } 697 local->dynamic_ps_user_timeout = timeout; 698 if (!local->disable_dynamic_ps) 699 conf->dynamic_ps_timeout = 700 local->dynamic_ps_user_timeout; 701 702 if (beaconint_us > latency) { 703 local->ps_sdata = NULL; 704 } else { 705 struct ieee80211_bss *bss; 706 int maxslp = 1; 707 u8 dtimper; 708 709 bss = (void *)found->u.mgd.associated->priv; 710 dtimper = bss->dtim_period; 711 712 /* If the TIM IE is invalid, pretend the value is 1 */ 713 if (!dtimper) 714 dtimper = 1; 715 else if (dtimper > 1) 716 maxslp = min_t(int, dtimper, 717 latency / beaconint_us); 718 719 local->hw.conf.max_sleep_period = maxslp; 720 local->hw.conf.ps_dtim_period = dtimper; 721 local->ps_sdata = found; 722 } 723 } else { 724 local->ps_sdata = NULL; 725 } 726 727 change: 728 ieee80211_change_ps(local); 729 } 730 731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 732 { 733 struct ieee80211_local *local = 734 container_of(work, struct ieee80211_local, 735 dynamic_ps_disable_work); 736 737 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 738 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 739 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 740 } 741 742 ieee80211_wake_queues_by_reason(&local->hw, 743 IEEE80211_QUEUE_STOP_REASON_PS); 744 } 745 746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 747 { 748 struct ieee80211_local *local = 749 container_of(work, struct ieee80211_local, 750 dynamic_ps_enable_work); 751 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 752 struct ieee80211_if_managed *ifmgd; 753 unsigned long flags; 754 int q; 755 756 /* can only happen when PS was just disabled anyway */ 757 if (!sdata) 758 return; 759 760 ifmgd = &sdata->u.mgd; 761 762 if (local->hw.conf.flags & IEEE80211_CONF_PS) 763 return; 764 765 if (!local->disable_dynamic_ps && 766 local->hw.conf.dynamic_ps_timeout > 0) { 767 /* don't enter PS if TX frames are pending */ 768 if (drv_tx_frames_pending(local)) { 769 mod_timer(&local->dynamic_ps_timer, jiffies + 770 msecs_to_jiffies( 771 local->hw.conf.dynamic_ps_timeout)); 772 return; 773 } 774 775 /* 776 * transmission can be stopped by others which leads to 777 * dynamic_ps_timer expiry. Postpone the ps timer if it 778 * is not the actual idle state. 779 */ 780 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 781 for (q = 0; q < local->hw.queues; q++) { 782 if (local->queue_stop_reasons[q]) { 783 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 784 flags); 785 mod_timer(&local->dynamic_ps_timer, jiffies + 786 msecs_to_jiffies( 787 local->hw.conf.dynamic_ps_timeout)); 788 return; 789 } 790 } 791 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 792 } 793 794 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 795 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 796 netif_tx_stop_all_queues(sdata->dev); 797 798 if (drv_tx_frames_pending(local)) 799 mod_timer(&local->dynamic_ps_timer, jiffies + 800 msecs_to_jiffies( 801 local->hw.conf.dynamic_ps_timeout)); 802 else { 803 ieee80211_send_nullfunc(local, sdata, 1); 804 /* Flush to get the tx status of nullfunc frame */ 805 drv_flush(local, false); 806 } 807 } 808 809 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 810 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 811 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 812 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 813 local->hw.conf.flags |= IEEE80211_CONF_PS; 814 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 815 } 816 817 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 818 netif_tx_wake_all_queues(sdata->dev); 819 } 820 821 void ieee80211_dynamic_ps_timer(unsigned long data) 822 { 823 struct ieee80211_local *local = (void *) data; 824 825 if (local->quiescing || local->suspended) 826 return; 827 828 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 829 } 830 831 /* MLME */ 832 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 833 struct ieee80211_sub_if_data *sdata, 834 u8 *wmm_param, size_t wmm_param_len) 835 { 836 struct ieee80211_tx_queue_params params; 837 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 838 size_t left; 839 int count; 840 u8 *pos, uapsd_queues = 0; 841 842 if (!local->ops->conf_tx) 843 return; 844 845 if (local->hw.queues < 4) 846 return; 847 848 if (!wmm_param) 849 return; 850 851 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 852 return; 853 854 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 855 uapsd_queues = local->uapsd_queues; 856 857 count = wmm_param[6] & 0x0f; 858 if (count == ifmgd->wmm_last_param_set) 859 return; 860 ifmgd->wmm_last_param_set = count; 861 862 pos = wmm_param + 8; 863 left = wmm_param_len - 8; 864 865 memset(¶ms, 0, sizeof(params)); 866 867 local->wmm_acm = 0; 868 for (; left >= 4; left -= 4, pos += 4) { 869 int aci = (pos[0] >> 5) & 0x03; 870 int acm = (pos[0] >> 4) & 0x01; 871 bool uapsd = false; 872 int queue; 873 874 switch (aci) { 875 case 1: /* AC_BK */ 876 queue = 3; 877 if (acm) 878 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 879 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 880 uapsd = true; 881 break; 882 case 2: /* AC_VI */ 883 queue = 1; 884 if (acm) 885 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 886 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 887 uapsd = true; 888 break; 889 case 3: /* AC_VO */ 890 queue = 0; 891 if (acm) 892 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 893 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 894 uapsd = true; 895 break; 896 case 0: /* AC_BE */ 897 default: 898 queue = 2; 899 if (acm) 900 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 901 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 902 uapsd = true; 903 break; 904 } 905 906 params.aifs = pos[0] & 0x0f; 907 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 908 params.cw_min = ecw2cw(pos[1] & 0x0f); 909 params.txop = get_unaligned_le16(pos + 2); 910 params.uapsd = uapsd; 911 912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 913 wiphy_debug(local->hw.wiphy, 914 "WMM queue=%d aci=%d acm=%d aifs=%d " 915 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 916 queue, aci, acm, 917 params.aifs, params.cw_min, params.cw_max, 918 params.txop, params.uapsd); 919 #endif 920 local->tx_conf[queue] = params; 921 if (drv_conf_tx(local, queue, ¶ms)) 922 wiphy_debug(local->hw.wiphy, 923 "failed to set TX queue parameters for queue %d\n", 924 queue); 925 } 926 927 /* enable WMM or activate new settings */ 928 sdata->vif.bss_conf.qos = true; 929 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 930 } 931 932 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 933 u16 capab, bool erp_valid, u8 erp) 934 { 935 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 936 u32 changed = 0; 937 bool use_protection; 938 bool use_short_preamble; 939 bool use_short_slot; 940 941 if (erp_valid) { 942 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 943 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 944 } else { 945 use_protection = false; 946 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 947 } 948 949 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 950 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 951 use_short_slot = true; 952 953 if (use_protection != bss_conf->use_cts_prot) { 954 bss_conf->use_cts_prot = use_protection; 955 changed |= BSS_CHANGED_ERP_CTS_PROT; 956 } 957 958 if (use_short_preamble != bss_conf->use_short_preamble) { 959 bss_conf->use_short_preamble = use_short_preamble; 960 changed |= BSS_CHANGED_ERP_PREAMBLE; 961 } 962 963 if (use_short_slot != bss_conf->use_short_slot) { 964 bss_conf->use_short_slot = use_short_slot; 965 changed |= BSS_CHANGED_ERP_SLOT; 966 } 967 968 return changed; 969 } 970 971 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 972 struct cfg80211_bss *cbss, 973 u32 bss_info_changed) 974 { 975 struct ieee80211_bss *bss = (void *)cbss->priv; 976 struct ieee80211_local *local = sdata->local; 977 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 978 979 bss_info_changed |= BSS_CHANGED_ASSOC; 980 /* set timing information */ 981 bss_conf->beacon_int = cbss->beacon_interval; 982 bss_conf->timestamp = cbss->tsf; 983 984 bss_info_changed |= BSS_CHANGED_BEACON_INT; 985 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 986 cbss->capability, bss->has_erp_value, bss->erp_value); 987 988 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 989 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 990 991 sdata->u.mgd.associated = cbss; 992 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 993 994 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 995 996 /* just to be sure */ 997 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 998 IEEE80211_STA_BEACON_POLL); 999 1000 ieee80211_led_assoc(local, 1); 1001 1002 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1003 bss_conf->dtim_period = bss->dtim_period; 1004 else 1005 bss_conf->dtim_period = 0; 1006 1007 bss_conf->assoc = 1; 1008 /* 1009 * For now just always ask the driver to update the basic rateset 1010 * when we have associated, we aren't checking whether it actually 1011 * changed or not. 1012 */ 1013 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1014 1015 /* And the BSSID changed - we're associated now */ 1016 bss_info_changed |= BSS_CHANGED_BSSID; 1017 1018 /* Tell the driver to monitor connection quality (if supported) */ 1019 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1020 bss_conf->cqm_rssi_thold) 1021 bss_info_changed |= BSS_CHANGED_CQM; 1022 1023 /* Enable ARP filtering */ 1024 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1025 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1026 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1027 } 1028 1029 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1030 1031 mutex_lock(&local->iflist_mtx); 1032 ieee80211_recalc_ps(local, -1); 1033 ieee80211_recalc_smps(local); 1034 mutex_unlock(&local->iflist_mtx); 1035 1036 netif_tx_start_all_queues(sdata->dev); 1037 netif_carrier_on(sdata->dev); 1038 } 1039 1040 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1041 bool remove_sta, bool tx) 1042 { 1043 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1044 struct ieee80211_local *local = sdata->local; 1045 struct sta_info *sta; 1046 u32 changed = 0, config_changed = 0; 1047 u8 bssid[ETH_ALEN]; 1048 1049 ASSERT_MGD_MTX(ifmgd); 1050 1051 if (WARN_ON(!ifmgd->associated)) 1052 return; 1053 1054 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1055 1056 ifmgd->associated = NULL; 1057 memset(ifmgd->bssid, 0, ETH_ALEN); 1058 1059 /* 1060 * we need to commit the associated = NULL change because the 1061 * scan code uses that to determine whether this iface should 1062 * go to/wake up from powersave or not -- and could otherwise 1063 * wake the queues erroneously. 1064 */ 1065 smp_mb(); 1066 1067 /* 1068 * Thus, we can only afterwards stop the queues -- to account 1069 * for the case where another CPU is finishing a scan at this 1070 * time -- we don't want the scan code to enable queues. 1071 */ 1072 1073 netif_tx_stop_all_queues(sdata->dev); 1074 netif_carrier_off(sdata->dev); 1075 1076 mutex_lock(&local->sta_mtx); 1077 sta = sta_info_get(sdata, bssid); 1078 if (sta) { 1079 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 1080 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1081 } 1082 mutex_unlock(&local->sta_mtx); 1083 1084 changed |= ieee80211_reset_erp_info(sdata); 1085 1086 ieee80211_led_assoc(local, 0); 1087 changed |= BSS_CHANGED_ASSOC; 1088 sdata->vif.bss_conf.assoc = false; 1089 1090 ieee80211_set_wmm_default(sdata); 1091 1092 /* channel(_type) changes are handled by ieee80211_hw_config */ 1093 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1094 1095 /* on the next assoc, re-program HT parameters */ 1096 sdata->ht_opmode_valid = false; 1097 1098 local->power_constr_level = 0; 1099 1100 del_timer_sync(&local->dynamic_ps_timer); 1101 cancel_work_sync(&local->dynamic_ps_enable_work); 1102 1103 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1104 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1105 config_changed |= IEEE80211_CONF_CHANGE_PS; 1106 } 1107 local->ps_sdata = NULL; 1108 1109 ieee80211_hw_config(local, config_changed); 1110 1111 /* Disable ARP filtering */ 1112 if (sdata->vif.bss_conf.arp_filter_enabled) { 1113 sdata->vif.bss_conf.arp_filter_enabled = false; 1114 changed |= BSS_CHANGED_ARP_FILTER; 1115 } 1116 1117 /* The BSSID (not really interesting) and HT changed */ 1118 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1119 ieee80211_bss_info_change_notify(sdata, changed); 1120 1121 if (remove_sta) 1122 sta_info_destroy_addr(sdata, bssid); 1123 1124 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1125 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1126 del_timer_sync(&sdata->u.mgd.timer); 1127 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1128 } 1129 1130 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1131 struct ieee80211_hdr *hdr) 1132 { 1133 /* 1134 * We can postpone the mgd.timer whenever receiving unicast frames 1135 * from AP because we know that the connection is working both ways 1136 * at that time. But multicast frames (and hence also beacons) must 1137 * be ignored here, because we need to trigger the timer during 1138 * data idle periods for sending the periodic probe request to the 1139 * AP we're connected to. 1140 */ 1141 if (is_multicast_ether_addr(hdr->addr1)) 1142 return; 1143 1144 ieee80211_sta_reset_conn_monitor(sdata); 1145 } 1146 1147 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1148 { 1149 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1150 1151 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1152 IEEE80211_STA_CONNECTION_POLL))) 1153 return; 1154 1155 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1156 IEEE80211_STA_BEACON_POLL); 1157 mutex_lock(&sdata->local->iflist_mtx); 1158 ieee80211_recalc_ps(sdata->local, -1); 1159 mutex_unlock(&sdata->local->iflist_mtx); 1160 1161 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1162 return; 1163 1164 /* 1165 * We've received a probe response, but are not sure whether 1166 * we have or will be receiving any beacons or data, so let's 1167 * schedule the timers again, just in case. 1168 */ 1169 ieee80211_sta_reset_beacon_monitor(sdata); 1170 1171 mod_timer(&ifmgd->conn_mon_timer, 1172 round_jiffies_up(jiffies + 1173 IEEE80211_CONNECTION_IDLE_TIME)); 1174 } 1175 1176 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1177 struct ieee80211_hdr *hdr, bool ack) 1178 { 1179 if (!ieee80211_is_data(hdr->frame_control)) 1180 return; 1181 1182 if (ack) 1183 ieee80211_sta_reset_conn_monitor(sdata); 1184 1185 if (ieee80211_is_nullfunc(hdr->frame_control) && 1186 sdata->u.mgd.probe_send_count > 0) { 1187 if (ack) 1188 sdata->u.mgd.probe_send_count = 0; 1189 else 1190 sdata->u.mgd.nullfunc_failed = true; 1191 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1192 } 1193 } 1194 1195 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1196 { 1197 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1198 const u8 *ssid; 1199 u8 *dst = ifmgd->associated->bssid; 1200 u8 unicast_limit = max(1, max_probe_tries - 3); 1201 1202 /* 1203 * Try sending broadcast probe requests for the last three 1204 * probe requests after the first ones failed since some 1205 * buggy APs only support broadcast probe requests. 1206 */ 1207 if (ifmgd->probe_send_count >= unicast_limit) 1208 dst = NULL; 1209 1210 /* 1211 * When the hardware reports an accurate Tx ACK status, it's 1212 * better to send a nullfunc frame instead of a probe request, 1213 * as it will kick us off the AP quickly if we aren't associated 1214 * anymore. The timeout will be reset if the frame is ACKed by 1215 * the AP. 1216 */ 1217 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1218 ifmgd->nullfunc_failed = false; 1219 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1220 } else { 1221 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1222 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0, 1223 (u32) -1, true); 1224 } 1225 1226 ifmgd->probe_send_count++; 1227 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1228 run_again(ifmgd, ifmgd->probe_timeout); 1229 } 1230 1231 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1232 bool beacon) 1233 { 1234 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1235 bool already = false; 1236 1237 if (!ieee80211_sdata_running(sdata)) 1238 return; 1239 1240 if (sdata->local->scanning) 1241 return; 1242 1243 if (sdata->local->tmp_channel) 1244 return; 1245 1246 mutex_lock(&ifmgd->mtx); 1247 1248 if (!ifmgd->associated) 1249 goto out; 1250 1251 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1252 if (beacon && net_ratelimit()) 1253 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1254 "- sending probe request\n", sdata->name); 1255 #endif 1256 1257 /* 1258 * The driver/our work has already reported this event or the 1259 * connection monitoring has kicked in and we have already sent 1260 * a probe request. Or maybe the AP died and the driver keeps 1261 * reporting until we disassociate... 1262 * 1263 * In either case we have to ignore the current call to this 1264 * function (except for setting the correct probe reason bit) 1265 * because otherwise we would reset the timer every time and 1266 * never check whether we received a probe response! 1267 */ 1268 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1269 IEEE80211_STA_CONNECTION_POLL)) 1270 already = true; 1271 1272 if (beacon) 1273 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1274 else 1275 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1276 1277 if (already) 1278 goto out; 1279 1280 mutex_lock(&sdata->local->iflist_mtx); 1281 ieee80211_recalc_ps(sdata->local, -1); 1282 mutex_unlock(&sdata->local->iflist_mtx); 1283 1284 ifmgd->probe_send_count = 0; 1285 ieee80211_mgd_probe_ap_send(sdata); 1286 out: 1287 mutex_unlock(&ifmgd->mtx); 1288 } 1289 1290 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1291 struct ieee80211_vif *vif) 1292 { 1293 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1294 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1295 struct sk_buff *skb; 1296 const u8 *ssid; 1297 1298 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1299 return NULL; 1300 1301 ASSERT_MGD_MTX(ifmgd); 1302 1303 if (!ifmgd->associated) 1304 return NULL; 1305 1306 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1307 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1308 (u32) -1, ssid + 2, ssid[1], 1309 NULL, 0, true); 1310 1311 return skb; 1312 } 1313 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1314 1315 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1316 { 1317 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1318 struct ieee80211_local *local = sdata->local; 1319 u8 bssid[ETH_ALEN]; 1320 1321 mutex_lock(&ifmgd->mtx); 1322 if (!ifmgd->associated) { 1323 mutex_unlock(&ifmgd->mtx); 1324 return; 1325 } 1326 1327 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1328 1329 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1330 sdata->name, bssid); 1331 1332 ieee80211_set_disassoc(sdata, true, true); 1333 mutex_unlock(&ifmgd->mtx); 1334 1335 mutex_lock(&local->mtx); 1336 ieee80211_recalc_idle(local); 1337 mutex_unlock(&local->mtx); 1338 /* 1339 * must be outside lock due to cfg80211, 1340 * but that's not a problem. 1341 */ 1342 ieee80211_send_deauth_disassoc(sdata, bssid, 1343 IEEE80211_STYPE_DEAUTH, 1344 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1345 NULL, true); 1346 } 1347 1348 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1349 { 1350 struct ieee80211_sub_if_data *sdata = 1351 container_of(work, struct ieee80211_sub_if_data, 1352 u.mgd.beacon_connection_loss_work); 1353 1354 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1355 __ieee80211_connection_loss(sdata); 1356 else 1357 ieee80211_mgd_probe_ap(sdata, true); 1358 } 1359 1360 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1361 { 1362 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1363 struct ieee80211_hw *hw = &sdata->local->hw; 1364 1365 trace_api_beacon_loss(sdata); 1366 1367 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1368 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1369 } 1370 EXPORT_SYMBOL(ieee80211_beacon_loss); 1371 1372 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1373 { 1374 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1375 struct ieee80211_hw *hw = &sdata->local->hw; 1376 1377 trace_api_connection_loss(sdata); 1378 1379 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1380 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1381 } 1382 EXPORT_SYMBOL(ieee80211_connection_loss); 1383 1384 1385 static enum rx_mgmt_action __must_check 1386 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1387 struct ieee80211_mgmt *mgmt, size_t len) 1388 { 1389 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1390 const u8 *bssid = NULL; 1391 u16 reason_code; 1392 1393 if (len < 24 + 2) 1394 return RX_MGMT_NONE; 1395 1396 ASSERT_MGD_MTX(ifmgd); 1397 1398 bssid = ifmgd->associated->bssid; 1399 1400 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1401 1402 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1403 sdata->name, bssid, reason_code); 1404 1405 ieee80211_set_disassoc(sdata, true, false); 1406 mutex_lock(&sdata->local->mtx); 1407 ieee80211_recalc_idle(sdata->local); 1408 mutex_unlock(&sdata->local->mtx); 1409 1410 return RX_MGMT_CFG80211_DEAUTH; 1411 } 1412 1413 1414 static enum rx_mgmt_action __must_check 1415 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1416 struct ieee80211_mgmt *mgmt, size_t len) 1417 { 1418 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1419 u16 reason_code; 1420 1421 if (len < 24 + 2) 1422 return RX_MGMT_NONE; 1423 1424 ASSERT_MGD_MTX(ifmgd); 1425 1426 if (WARN_ON(!ifmgd->associated)) 1427 return RX_MGMT_NONE; 1428 1429 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1430 return RX_MGMT_NONE; 1431 1432 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1433 1434 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1435 sdata->name, mgmt->sa, reason_code); 1436 1437 ieee80211_set_disassoc(sdata, true, false); 1438 mutex_lock(&sdata->local->mtx); 1439 ieee80211_recalc_idle(sdata->local); 1440 mutex_unlock(&sdata->local->mtx); 1441 return RX_MGMT_CFG80211_DISASSOC; 1442 } 1443 1444 1445 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1446 struct ieee80211_mgmt *mgmt, size_t len) 1447 { 1448 struct ieee80211_sub_if_data *sdata = wk->sdata; 1449 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1450 struct ieee80211_local *local = sdata->local; 1451 struct ieee80211_supported_band *sband; 1452 struct sta_info *sta; 1453 struct cfg80211_bss *cbss = wk->assoc.bss; 1454 u8 *pos; 1455 u32 rates, basic_rates; 1456 u16 capab_info, aid; 1457 struct ieee802_11_elems elems; 1458 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1459 u32 changed = 0; 1460 int i, j, err; 1461 bool have_higher_than_11mbit = false; 1462 u16 ap_ht_cap_flags; 1463 1464 /* AssocResp and ReassocResp have identical structure */ 1465 1466 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1467 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1468 1469 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1470 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1471 "set\n", sdata->name, aid); 1472 aid &= ~(BIT(15) | BIT(14)); 1473 1474 pos = mgmt->u.assoc_resp.variable; 1475 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1476 1477 if (!elems.supp_rates) { 1478 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1479 sdata->name); 1480 return false; 1481 } 1482 1483 ifmgd->aid = aid; 1484 1485 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1486 if (!sta) { 1487 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1488 " the AP\n", sdata->name); 1489 return false; 1490 } 1491 1492 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1493 WLAN_STA_ASSOC_AP); 1494 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1495 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1496 1497 rates = 0; 1498 basic_rates = 0; 1499 sband = local->hw.wiphy->bands[wk->chan->band]; 1500 1501 for (i = 0; i < elems.supp_rates_len; i++) { 1502 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1503 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1504 1505 if (rate > 110) 1506 have_higher_than_11mbit = true; 1507 1508 for (j = 0; j < sband->n_bitrates; j++) { 1509 if (sband->bitrates[j].bitrate == rate) { 1510 rates |= BIT(j); 1511 if (is_basic) 1512 basic_rates |= BIT(j); 1513 break; 1514 } 1515 } 1516 } 1517 1518 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1519 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1520 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1521 1522 if (rate > 110) 1523 have_higher_than_11mbit = true; 1524 1525 for (j = 0; j < sband->n_bitrates; j++) { 1526 if (sband->bitrates[j].bitrate == rate) { 1527 rates |= BIT(j); 1528 if (is_basic) 1529 basic_rates |= BIT(j); 1530 break; 1531 } 1532 } 1533 } 1534 1535 sta->sta.supp_rates[wk->chan->band] = rates; 1536 sdata->vif.bss_conf.basic_rates = basic_rates; 1537 1538 /* cf. IEEE 802.11 9.2.12 */ 1539 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1540 have_higher_than_11mbit) 1541 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1542 else 1543 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1544 1545 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1546 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1547 elems.ht_cap_elem, &sta->sta.ht_cap); 1548 1549 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1550 1551 rate_control_rate_init(sta); 1552 1553 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1554 set_sta_flags(sta, WLAN_STA_MFP); 1555 1556 if (elems.wmm_param) 1557 set_sta_flags(sta, WLAN_STA_WME); 1558 1559 err = sta_info_insert(sta); 1560 sta = NULL; 1561 if (err) { 1562 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1563 " the AP (error %d)\n", sdata->name, err); 1564 return false; 1565 } 1566 1567 /* 1568 * Always handle WMM once after association regardless 1569 * of the first value the AP uses. Setting -1 here has 1570 * that effect because the AP values is an unsigned 1571 * 4-bit value. 1572 */ 1573 ifmgd->wmm_last_param_set = -1; 1574 1575 if (elems.wmm_param) 1576 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1577 elems.wmm_param_len); 1578 else 1579 ieee80211_set_wmm_default(sdata); 1580 1581 local->oper_channel = wk->chan; 1582 1583 if (elems.ht_info_elem && elems.wmm_param && 1584 (sdata->local->hw.queues >= 4) && 1585 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1586 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1587 cbss->bssid, ap_ht_cap_flags); 1588 1589 /* set AID and assoc capability, 1590 * ieee80211_set_associated() will tell the driver */ 1591 bss_conf->aid = aid; 1592 bss_conf->assoc_capability = capab_info; 1593 ieee80211_set_associated(sdata, cbss, changed); 1594 1595 /* 1596 * If we're using 4-addr mode, let the AP know that we're 1597 * doing so, so that it can create the STA VLAN on its side 1598 */ 1599 if (ifmgd->use_4addr) 1600 ieee80211_send_4addr_nullfunc(local, sdata); 1601 1602 /* 1603 * Start timer to probe the connection to the AP now. 1604 * Also start the timer that will detect beacon loss. 1605 */ 1606 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1607 ieee80211_sta_reset_beacon_monitor(sdata); 1608 1609 return true; 1610 } 1611 1612 1613 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1614 struct ieee80211_mgmt *mgmt, 1615 size_t len, 1616 struct ieee80211_rx_status *rx_status, 1617 struct ieee802_11_elems *elems, 1618 bool beacon) 1619 { 1620 struct ieee80211_local *local = sdata->local; 1621 int freq; 1622 struct ieee80211_bss *bss; 1623 struct ieee80211_channel *channel; 1624 bool need_ps = false; 1625 1626 if (sdata->u.mgd.associated) { 1627 bss = (void *)sdata->u.mgd.associated->priv; 1628 /* not previously set so we may need to recalc */ 1629 need_ps = !bss->dtim_period; 1630 } 1631 1632 if (elems->ds_params && elems->ds_params_len == 1) 1633 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1634 rx_status->band); 1635 else 1636 freq = rx_status->freq; 1637 1638 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1639 1640 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1641 return; 1642 1643 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1644 channel, beacon); 1645 if (bss) 1646 ieee80211_rx_bss_put(local, bss); 1647 1648 if (!sdata->u.mgd.associated) 1649 return; 1650 1651 if (need_ps) { 1652 mutex_lock(&local->iflist_mtx); 1653 ieee80211_recalc_ps(local, -1); 1654 mutex_unlock(&local->iflist_mtx); 1655 } 1656 1657 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1658 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1659 ETH_ALEN) == 0)) { 1660 struct ieee80211_channel_sw_ie *sw_elem = 1661 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1662 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1663 bss, rx_status->mactime); 1664 } 1665 } 1666 1667 1668 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1669 struct sk_buff *skb) 1670 { 1671 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1672 struct ieee80211_if_managed *ifmgd; 1673 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1674 size_t baselen, len = skb->len; 1675 struct ieee802_11_elems elems; 1676 1677 ifmgd = &sdata->u.mgd; 1678 1679 ASSERT_MGD_MTX(ifmgd); 1680 1681 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1682 return; /* ignore ProbeResp to foreign address */ 1683 1684 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1685 if (baselen > len) 1686 return; 1687 1688 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1689 &elems); 1690 1691 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1692 1693 if (ifmgd->associated && 1694 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1695 ieee80211_reset_ap_probe(sdata); 1696 } 1697 1698 /* 1699 * This is the canonical list of information elements we care about, 1700 * the filter code also gives us all changes to the Microsoft OUI 1701 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1702 * 1703 * We implement beacon filtering in software since that means we can 1704 * avoid processing the frame here and in cfg80211, and userspace 1705 * will not be able to tell whether the hardware supports it or not. 1706 * 1707 * XXX: This list needs to be dynamic -- userspace needs to be able to 1708 * add items it requires. It also needs to be able to tell us to 1709 * look out for other vendor IEs. 1710 */ 1711 static const u64 care_about_ies = 1712 (1ULL << WLAN_EID_COUNTRY) | 1713 (1ULL << WLAN_EID_ERP_INFO) | 1714 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1715 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1716 (1ULL << WLAN_EID_HT_CAPABILITY) | 1717 (1ULL << WLAN_EID_HT_INFORMATION); 1718 1719 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1720 struct ieee80211_mgmt *mgmt, 1721 size_t len, 1722 struct ieee80211_rx_status *rx_status) 1723 { 1724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1725 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1726 size_t baselen; 1727 struct ieee802_11_elems elems; 1728 struct ieee80211_local *local = sdata->local; 1729 u32 changed = 0; 1730 bool erp_valid, directed_tim = false; 1731 u8 erp_value = 0; 1732 u32 ncrc; 1733 u8 *bssid; 1734 1735 ASSERT_MGD_MTX(ifmgd); 1736 1737 /* Process beacon from the current BSS */ 1738 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1739 if (baselen > len) 1740 return; 1741 1742 if (rx_status->freq != local->hw.conf.channel->center_freq) 1743 return; 1744 1745 /* 1746 * We might have received a number of frames, among them a 1747 * disassoc frame and a beacon... 1748 */ 1749 if (!ifmgd->associated) 1750 return; 1751 1752 bssid = ifmgd->associated->bssid; 1753 1754 /* 1755 * And in theory even frames from a different AP we were just 1756 * associated to a split-second ago! 1757 */ 1758 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1759 return; 1760 1761 /* Track average RSSI from the Beacon frames of the current AP */ 1762 ifmgd->last_beacon_signal = rx_status->signal; 1763 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1764 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1765 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1766 ifmgd->last_cqm_event_signal = 0; 1767 ifmgd->count_beacon_signal = 1; 1768 ifmgd->last_ave_beacon_signal = 0; 1769 } else { 1770 ifmgd->ave_beacon_signal = 1771 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1772 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1773 ifmgd->ave_beacon_signal) / 16; 1774 ifmgd->count_beacon_signal++; 1775 } 1776 1777 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 1778 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 1779 int sig = ifmgd->ave_beacon_signal; 1780 int last_sig = ifmgd->last_ave_beacon_signal; 1781 1782 /* 1783 * if signal crosses either of the boundaries, invoke callback 1784 * with appropriate parameters 1785 */ 1786 if (sig > ifmgd->rssi_max_thold && 1787 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 1788 ifmgd->last_ave_beacon_signal = sig; 1789 drv_rssi_callback(local, RSSI_EVENT_HIGH); 1790 } else if (sig < ifmgd->rssi_min_thold && 1791 (last_sig >= ifmgd->rssi_max_thold || 1792 last_sig == 0)) { 1793 ifmgd->last_ave_beacon_signal = sig; 1794 drv_rssi_callback(local, RSSI_EVENT_LOW); 1795 } 1796 } 1797 1798 if (bss_conf->cqm_rssi_thold && 1799 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1800 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1801 int sig = ifmgd->ave_beacon_signal / 16; 1802 int last_event = ifmgd->last_cqm_event_signal; 1803 int thold = bss_conf->cqm_rssi_thold; 1804 int hyst = bss_conf->cqm_rssi_hyst; 1805 if (sig < thold && 1806 (last_event == 0 || sig < last_event - hyst)) { 1807 ifmgd->last_cqm_event_signal = sig; 1808 ieee80211_cqm_rssi_notify( 1809 &sdata->vif, 1810 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1811 GFP_KERNEL); 1812 } else if (sig > thold && 1813 (last_event == 0 || sig > last_event + hyst)) { 1814 ifmgd->last_cqm_event_signal = sig; 1815 ieee80211_cqm_rssi_notify( 1816 &sdata->vif, 1817 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1818 GFP_KERNEL); 1819 } 1820 } 1821 1822 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1823 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1824 if (net_ratelimit()) { 1825 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1826 "to a received beacon\n", sdata->name); 1827 } 1828 #endif 1829 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1830 mutex_lock(&local->iflist_mtx); 1831 ieee80211_recalc_ps(local, -1); 1832 mutex_unlock(&local->iflist_mtx); 1833 } 1834 1835 /* 1836 * Push the beacon loss detection into the future since 1837 * we are processing a beacon from the AP just now. 1838 */ 1839 ieee80211_sta_reset_beacon_monitor(sdata); 1840 1841 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1842 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1843 len - baselen, &elems, 1844 care_about_ies, ncrc); 1845 1846 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1847 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1848 ifmgd->aid); 1849 1850 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1851 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1852 true); 1853 1854 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1855 elems.wmm_param_len); 1856 } 1857 1858 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1859 if (directed_tim) { 1860 if (local->hw.conf.dynamic_ps_timeout > 0) { 1861 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1862 ieee80211_hw_config(local, 1863 IEEE80211_CONF_CHANGE_PS); 1864 ieee80211_send_nullfunc(local, sdata, 0); 1865 } else { 1866 local->pspolling = true; 1867 1868 /* 1869 * Here is assumed that the driver will be 1870 * able to send ps-poll frame and receive a 1871 * response even though power save mode is 1872 * enabled, but some drivers might require 1873 * to disable power save here. This needs 1874 * to be investigated. 1875 */ 1876 ieee80211_send_pspoll(local, sdata); 1877 } 1878 } 1879 } 1880 1881 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1882 return; 1883 ifmgd->beacon_crc = ncrc; 1884 ifmgd->beacon_crc_valid = true; 1885 1886 if (elems.erp_info && elems.erp_info_len >= 1) { 1887 erp_valid = true; 1888 erp_value = elems.erp_info[0]; 1889 } else { 1890 erp_valid = false; 1891 } 1892 changed |= ieee80211_handle_bss_capability(sdata, 1893 le16_to_cpu(mgmt->u.beacon.capab_info), 1894 erp_valid, erp_value); 1895 1896 1897 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1898 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1899 struct sta_info *sta; 1900 struct ieee80211_supported_band *sband; 1901 u16 ap_ht_cap_flags; 1902 1903 rcu_read_lock(); 1904 1905 sta = sta_info_get(sdata, bssid); 1906 if (WARN_ON(!sta)) { 1907 rcu_read_unlock(); 1908 return; 1909 } 1910 1911 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1912 1913 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1914 elems.ht_cap_elem, &sta->sta.ht_cap); 1915 1916 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1917 1918 rcu_read_unlock(); 1919 1920 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1921 bssid, ap_ht_cap_flags); 1922 } 1923 1924 /* Note: country IE parsing is done for us by cfg80211 */ 1925 if (elems.country_elem) { 1926 /* TODO: IBSS also needs this */ 1927 if (elems.pwr_constr_elem) 1928 ieee80211_handle_pwr_constr(sdata, 1929 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1930 elems.pwr_constr_elem, 1931 elems.pwr_constr_elem_len); 1932 } 1933 1934 ieee80211_bss_info_change_notify(sdata, changed); 1935 } 1936 1937 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1938 struct sk_buff *skb) 1939 { 1940 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1941 struct ieee80211_rx_status *rx_status; 1942 struct ieee80211_mgmt *mgmt; 1943 enum rx_mgmt_action rma = RX_MGMT_NONE; 1944 u16 fc; 1945 1946 rx_status = (struct ieee80211_rx_status *) skb->cb; 1947 mgmt = (struct ieee80211_mgmt *) skb->data; 1948 fc = le16_to_cpu(mgmt->frame_control); 1949 1950 mutex_lock(&ifmgd->mtx); 1951 1952 if (ifmgd->associated && 1953 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1954 switch (fc & IEEE80211_FCTL_STYPE) { 1955 case IEEE80211_STYPE_BEACON: 1956 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1957 rx_status); 1958 break; 1959 case IEEE80211_STYPE_PROBE_RESP: 1960 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1961 break; 1962 case IEEE80211_STYPE_DEAUTH: 1963 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1964 break; 1965 case IEEE80211_STYPE_DISASSOC: 1966 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1967 break; 1968 case IEEE80211_STYPE_ACTION: 1969 switch (mgmt->u.action.category) { 1970 case WLAN_CATEGORY_SPECTRUM_MGMT: 1971 ieee80211_sta_process_chanswitch(sdata, 1972 &mgmt->u.action.u.chan_switch.sw_elem, 1973 (void *)ifmgd->associated->priv, 1974 rx_status->mactime); 1975 break; 1976 } 1977 } 1978 mutex_unlock(&ifmgd->mtx); 1979 1980 switch (rma) { 1981 case RX_MGMT_NONE: 1982 /* no action */ 1983 break; 1984 case RX_MGMT_CFG80211_DEAUTH: 1985 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1986 break; 1987 case RX_MGMT_CFG80211_DISASSOC: 1988 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1989 break; 1990 default: 1991 WARN(1, "unexpected: %d", rma); 1992 } 1993 return; 1994 } 1995 1996 mutex_unlock(&ifmgd->mtx); 1997 1998 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1999 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 2000 struct ieee80211_local *local = sdata->local; 2001 struct ieee80211_work *wk; 2002 2003 mutex_lock(&local->mtx); 2004 list_for_each_entry(wk, &local->work_list, list) { 2005 if (wk->sdata != sdata) 2006 continue; 2007 2008 if (wk->type != IEEE80211_WORK_ASSOC && 2009 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2010 continue; 2011 2012 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 2013 continue; 2014 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 2015 continue; 2016 2017 /* 2018 * Printing the message only here means we can't 2019 * spuriously print it, but it also means that it 2020 * won't be printed when the frame comes in before 2021 * we even tried to associate or in similar cases. 2022 * 2023 * Ultimately, I suspect cfg80211 should print the 2024 * messages instead. 2025 */ 2026 printk(KERN_DEBUG 2027 "%s: deauthenticated from %pM (Reason: %u)\n", 2028 sdata->name, mgmt->bssid, 2029 le16_to_cpu(mgmt->u.deauth.reason_code)); 2030 2031 list_del_rcu(&wk->list); 2032 free_work(wk); 2033 break; 2034 } 2035 mutex_unlock(&local->mtx); 2036 2037 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2038 } 2039 } 2040 2041 static void ieee80211_sta_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 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2050 return; 2051 } 2052 2053 ieee80211_queue_work(&local->hw, &sdata->work); 2054 } 2055 2056 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2057 u8 *bssid, u8 reason) 2058 { 2059 struct ieee80211_local *local = sdata->local; 2060 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2061 2062 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2063 IEEE80211_STA_BEACON_POLL); 2064 2065 ieee80211_set_disassoc(sdata, true, true); 2066 mutex_unlock(&ifmgd->mtx); 2067 mutex_lock(&local->mtx); 2068 ieee80211_recalc_idle(local); 2069 mutex_unlock(&local->mtx); 2070 /* 2071 * must be outside lock due to cfg80211, 2072 * but that's not a problem. 2073 */ 2074 ieee80211_send_deauth_disassoc(sdata, bssid, 2075 IEEE80211_STYPE_DEAUTH, reason, 2076 NULL, true); 2077 mutex_lock(&ifmgd->mtx); 2078 } 2079 2080 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2081 { 2082 struct ieee80211_local *local = sdata->local; 2083 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2084 2085 /* then process the rest of the work */ 2086 mutex_lock(&ifmgd->mtx); 2087 2088 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2089 IEEE80211_STA_CONNECTION_POLL) && 2090 ifmgd->associated) { 2091 u8 bssid[ETH_ALEN]; 2092 int max_tries; 2093 2094 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2095 2096 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2097 max_tries = max_nullfunc_tries; 2098 else 2099 max_tries = max_probe_tries; 2100 2101 /* ACK received for nullfunc probing frame */ 2102 if (!ifmgd->probe_send_count) 2103 ieee80211_reset_ap_probe(sdata); 2104 else if (ifmgd->nullfunc_failed) { 2105 if (ifmgd->probe_send_count < max_tries) { 2106 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2107 wiphy_debug(local->hw.wiphy, 2108 "%s: No ack for nullfunc frame to" 2109 " AP %pM, try %d/%i\n", 2110 sdata->name, bssid, 2111 ifmgd->probe_send_count, max_tries); 2112 #endif 2113 ieee80211_mgd_probe_ap_send(sdata); 2114 } else { 2115 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2116 wiphy_debug(local->hw.wiphy, 2117 "%s: No ack for nullfunc frame to" 2118 " AP %pM, disconnecting.\n", 2119 sdata->name, bssid); 2120 #endif 2121 ieee80211_sta_connection_lost(sdata, bssid, 2122 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2123 } 2124 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2125 run_again(ifmgd, ifmgd->probe_timeout); 2126 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2127 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2128 wiphy_debug(local->hw.wiphy, 2129 "%s: Failed to send nullfunc to AP %pM" 2130 " after %dms, disconnecting.\n", 2131 sdata->name, 2132 bssid, probe_wait_ms); 2133 #endif 2134 ieee80211_sta_connection_lost(sdata, bssid, 2135 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2136 } else if (ifmgd->probe_send_count < max_tries) { 2137 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2138 wiphy_debug(local->hw.wiphy, 2139 "%s: No probe response from AP %pM" 2140 " after %dms, try %d/%i\n", 2141 sdata->name, 2142 bssid, probe_wait_ms, 2143 ifmgd->probe_send_count, max_tries); 2144 #endif 2145 ieee80211_mgd_probe_ap_send(sdata); 2146 } else { 2147 /* 2148 * We actually lost the connection ... or did we? 2149 * Let's make sure! 2150 */ 2151 wiphy_debug(local->hw.wiphy, 2152 "%s: No probe response from AP %pM" 2153 " after %dms, disconnecting.\n", 2154 sdata->name, 2155 bssid, probe_wait_ms); 2156 2157 ieee80211_sta_connection_lost(sdata, bssid, 2158 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2159 } 2160 } 2161 2162 mutex_unlock(&ifmgd->mtx); 2163 } 2164 2165 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2166 { 2167 struct ieee80211_sub_if_data *sdata = 2168 (struct ieee80211_sub_if_data *) data; 2169 struct ieee80211_local *local = sdata->local; 2170 2171 if (local->quiescing) 2172 return; 2173 2174 ieee80211_queue_work(&sdata->local->hw, 2175 &sdata->u.mgd.beacon_connection_loss_work); 2176 } 2177 2178 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2179 { 2180 struct ieee80211_sub_if_data *sdata = 2181 (struct ieee80211_sub_if_data *) data; 2182 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2183 struct ieee80211_local *local = sdata->local; 2184 2185 if (local->quiescing) 2186 return; 2187 2188 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2189 } 2190 2191 static void ieee80211_sta_monitor_work(struct work_struct *work) 2192 { 2193 struct ieee80211_sub_if_data *sdata = 2194 container_of(work, struct ieee80211_sub_if_data, 2195 u.mgd.monitor_work); 2196 2197 ieee80211_mgd_probe_ap(sdata, false); 2198 } 2199 2200 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2201 { 2202 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2203 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2204 IEEE80211_STA_CONNECTION_POLL); 2205 2206 /* let's probe the connection once */ 2207 ieee80211_queue_work(&sdata->local->hw, 2208 &sdata->u.mgd.monitor_work); 2209 /* and do all the other regular work too */ 2210 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2211 } 2212 } 2213 2214 #ifdef CONFIG_PM 2215 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2216 { 2217 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2218 2219 /* 2220 * we need to use atomic bitops for the running bits 2221 * only because both timers might fire at the same 2222 * time -- the code here is properly synchronised. 2223 */ 2224 2225 cancel_work_sync(&ifmgd->request_smps_work); 2226 2227 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2228 if (del_timer_sync(&ifmgd->timer)) 2229 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2230 2231 cancel_work_sync(&ifmgd->chswitch_work); 2232 if (del_timer_sync(&ifmgd->chswitch_timer)) 2233 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2234 2235 cancel_work_sync(&ifmgd->monitor_work); 2236 /* these will just be re-established on connection */ 2237 del_timer_sync(&ifmgd->conn_mon_timer); 2238 del_timer_sync(&ifmgd->bcn_mon_timer); 2239 } 2240 2241 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2242 { 2243 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2244 2245 if (!ifmgd->associated) 2246 return; 2247 2248 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2249 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2250 mutex_lock(&ifmgd->mtx); 2251 if (ifmgd->associated) { 2252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2253 wiphy_debug(sdata->local->hw.wiphy, 2254 "%s: driver requested disconnect after resume.\n", 2255 sdata->name); 2256 #endif 2257 ieee80211_sta_connection_lost(sdata, 2258 ifmgd->associated->bssid, 2259 WLAN_REASON_UNSPECIFIED); 2260 mutex_unlock(&ifmgd->mtx); 2261 return; 2262 } 2263 mutex_unlock(&ifmgd->mtx); 2264 } 2265 2266 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2267 add_timer(&ifmgd->timer); 2268 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2269 add_timer(&ifmgd->chswitch_timer); 2270 ieee80211_sta_reset_beacon_monitor(sdata); 2271 ieee80211_restart_sta_timer(sdata); 2272 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); 2273 } 2274 #endif 2275 2276 /* interface setup */ 2277 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2278 { 2279 struct ieee80211_if_managed *ifmgd; 2280 2281 ifmgd = &sdata->u.mgd; 2282 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2283 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2284 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2285 ieee80211_beacon_connection_loss_work); 2286 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2287 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2288 (unsigned long) sdata); 2289 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2290 (unsigned long) sdata); 2291 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2292 (unsigned long) sdata); 2293 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2294 (unsigned long) sdata); 2295 2296 ifmgd->flags = 0; 2297 2298 mutex_init(&ifmgd->mtx); 2299 2300 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2301 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2302 else 2303 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2304 } 2305 2306 /* scan finished notification */ 2307 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2308 { 2309 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2310 2311 /* Restart STA timers */ 2312 rcu_read_lock(); 2313 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2314 ieee80211_restart_sta_timer(sdata); 2315 rcu_read_unlock(); 2316 } 2317 2318 int ieee80211_max_network_latency(struct notifier_block *nb, 2319 unsigned long data, void *dummy) 2320 { 2321 s32 latency_usec = (s32) data; 2322 struct ieee80211_local *local = 2323 container_of(nb, struct ieee80211_local, 2324 network_latency_notifier); 2325 2326 mutex_lock(&local->iflist_mtx); 2327 ieee80211_recalc_ps(local, latency_usec); 2328 mutex_unlock(&local->iflist_mtx); 2329 2330 return 0; 2331 } 2332 2333 /* config hooks */ 2334 static enum work_done_result 2335 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2336 struct sk_buff *skb) 2337 { 2338 struct ieee80211_local *local = wk->sdata->local; 2339 2340 if (!skb) { 2341 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2342 goto destroy; 2343 } 2344 2345 if (wk->type == IEEE80211_WORK_AUTH) { 2346 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2347 goto destroy; 2348 } 2349 2350 mutex_lock(&wk->sdata->u.mgd.mtx); 2351 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2352 mutex_unlock(&wk->sdata->u.mgd.mtx); 2353 2354 wk->type = IEEE80211_WORK_AUTH; 2355 wk->probe_auth.tries = 0; 2356 return WORK_DONE_REQUEUE; 2357 destroy: 2358 if (wk->probe_auth.synced) 2359 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2360 IEEE80211_TX_SYNC_AUTH); 2361 2362 return WORK_DONE_DESTROY; 2363 } 2364 2365 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2366 struct cfg80211_auth_request *req) 2367 { 2368 const u8 *ssid; 2369 struct ieee80211_work *wk; 2370 u16 auth_alg; 2371 2372 if (req->local_state_change) 2373 return 0; /* no need to update mac80211 state */ 2374 2375 switch (req->auth_type) { 2376 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2377 auth_alg = WLAN_AUTH_OPEN; 2378 break; 2379 case NL80211_AUTHTYPE_SHARED_KEY: 2380 if (IS_ERR(sdata->local->wep_tx_tfm)) 2381 return -EOPNOTSUPP; 2382 auth_alg = WLAN_AUTH_SHARED_KEY; 2383 break; 2384 case NL80211_AUTHTYPE_FT: 2385 auth_alg = WLAN_AUTH_FT; 2386 break; 2387 case NL80211_AUTHTYPE_NETWORK_EAP: 2388 auth_alg = WLAN_AUTH_LEAP; 2389 break; 2390 default: 2391 return -EOPNOTSUPP; 2392 } 2393 2394 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2395 if (!wk) 2396 return -ENOMEM; 2397 2398 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2399 2400 if (req->ie && req->ie_len) { 2401 memcpy(wk->ie, req->ie, req->ie_len); 2402 wk->ie_len = req->ie_len; 2403 } 2404 2405 if (req->key && req->key_len) { 2406 wk->probe_auth.key_len = req->key_len; 2407 wk->probe_auth.key_idx = req->key_idx; 2408 memcpy(wk->probe_auth.key, req->key, req->key_len); 2409 } 2410 2411 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2412 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2413 wk->probe_auth.ssid_len = ssid[1]; 2414 2415 wk->probe_auth.algorithm = auth_alg; 2416 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2417 2418 /* if we already have a probe, don't probe again */ 2419 if (req->bss->proberesp_ies) 2420 wk->type = IEEE80211_WORK_AUTH; 2421 else 2422 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2423 wk->chan = req->bss->channel; 2424 wk->chan_type = NL80211_CHAN_NO_HT; 2425 wk->sdata = sdata; 2426 wk->done = ieee80211_probe_auth_done; 2427 2428 ieee80211_add_work(wk); 2429 return 0; 2430 } 2431 2432 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2433 struct sk_buff *skb) 2434 { 2435 struct ieee80211_local *local = wk->sdata->local; 2436 struct ieee80211_mgmt *mgmt; 2437 struct ieee80211_rx_status *rx_status; 2438 struct ieee802_11_elems elems; 2439 u16 status; 2440 2441 if (!skb) { 2442 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2443 goto destroy; 2444 } 2445 2446 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2447 mutex_lock(&wk->sdata->u.mgd.mtx); 2448 rx_status = (void *) skb->cb; 2449 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2450 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2451 &elems, true); 2452 mutex_unlock(&wk->sdata->u.mgd.mtx); 2453 2454 wk->type = IEEE80211_WORK_ASSOC; 2455 /* not really done yet */ 2456 return WORK_DONE_REQUEUE; 2457 } 2458 2459 mgmt = (void *)skb->data; 2460 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2461 2462 if (status == WLAN_STATUS_SUCCESS) { 2463 if (wk->assoc.synced) 2464 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2465 IEEE80211_TX_SYNC_ASSOC); 2466 2467 mutex_lock(&wk->sdata->u.mgd.mtx); 2468 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2469 mutex_unlock(&wk->sdata->u.mgd.mtx); 2470 /* oops -- internal error -- send timeout for now */ 2471 cfg80211_send_assoc_timeout(wk->sdata->dev, 2472 wk->filter_ta); 2473 return WORK_DONE_DESTROY; 2474 } 2475 2476 mutex_unlock(&wk->sdata->u.mgd.mtx); 2477 } 2478 2479 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2480 destroy: 2481 if (wk->assoc.synced) 2482 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2483 IEEE80211_TX_SYNC_ASSOC); 2484 2485 return WORK_DONE_DESTROY; 2486 } 2487 2488 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2489 struct cfg80211_assoc_request *req) 2490 { 2491 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2492 struct ieee80211_bss *bss = (void *)req->bss->priv; 2493 struct ieee80211_work *wk; 2494 const u8 *ssid; 2495 int i; 2496 2497 mutex_lock(&ifmgd->mtx); 2498 if (ifmgd->associated) { 2499 if (!req->prev_bssid || 2500 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2501 ETH_ALEN)) { 2502 /* 2503 * We are already associated and the request was not a 2504 * reassociation request from the current BSS, so 2505 * reject it. 2506 */ 2507 mutex_unlock(&ifmgd->mtx); 2508 return -EALREADY; 2509 } 2510 2511 /* Trying to reassociate - clear previous association state */ 2512 ieee80211_set_disassoc(sdata, true, false); 2513 } 2514 mutex_unlock(&ifmgd->mtx); 2515 2516 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2517 if (!wk) 2518 return -ENOMEM; 2519 2520 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2521 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2522 2523 ifmgd->beacon_crc_valid = false; 2524 2525 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2526 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2527 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2528 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2529 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2530 2531 2532 if (req->ie && req->ie_len) { 2533 memcpy(wk->ie, req->ie, req->ie_len); 2534 wk->ie_len = req->ie_len; 2535 } else 2536 wk->ie_len = 0; 2537 2538 wk->assoc.bss = req->bss; 2539 2540 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2541 2542 /* new association always uses requested smps mode */ 2543 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2544 if (ifmgd->powersave) 2545 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2546 else 2547 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2548 } else 2549 ifmgd->ap_smps = ifmgd->req_smps; 2550 2551 wk->assoc.smps = ifmgd->ap_smps; 2552 /* 2553 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2554 * We still associate in non-HT mode (11a/b/g) if any one of these 2555 * ciphers is configured as pairwise. 2556 * We can set this to true for non-11n hardware, that'll be checked 2557 * separately along with the peer capabilities. 2558 */ 2559 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2560 wk->assoc.capability = req->bss->capability; 2561 wk->assoc.wmm_used = bss->wmm_used; 2562 wk->assoc.supp_rates = bss->supp_rates; 2563 wk->assoc.supp_rates_len = bss->supp_rates_len; 2564 wk->assoc.ht_information_ie = 2565 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2566 2567 if (bss->wmm_used && bss->uapsd_supported && 2568 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2569 wk->assoc.uapsd_used = true; 2570 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2571 } else { 2572 wk->assoc.uapsd_used = false; 2573 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2574 } 2575 2576 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2577 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2578 wk->assoc.ssid_len = ssid[1]; 2579 2580 if (req->prev_bssid) 2581 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2582 2583 wk->chan = req->bss->channel; 2584 wk->chan_type = NL80211_CHAN_NO_HT; 2585 wk->sdata = sdata; 2586 wk->done = ieee80211_assoc_done; 2587 if (!bss->dtim_period && 2588 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2589 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2590 else 2591 wk->type = IEEE80211_WORK_ASSOC; 2592 2593 if (req->use_mfp) { 2594 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2595 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2596 } else { 2597 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2598 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2599 } 2600 2601 if (req->crypto.control_port) 2602 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2603 else 2604 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2605 2606 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2607 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2608 2609 ieee80211_add_work(wk); 2610 return 0; 2611 } 2612 2613 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2614 struct cfg80211_deauth_request *req, 2615 void *cookie) 2616 { 2617 struct ieee80211_local *local = sdata->local; 2618 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2619 struct ieee80211_work *wk; 2620 u8 bssid[ETH_ALEN]; 2621 bool assoc_bss = false; 2622 2623 mutex_lock(&ifmgd->mtx); 2624 2625 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2626 if (ifmgd->associated == req->bss) { 2627 ieee80211_set_disassoc(sdata, false, true); 2628 mutex_unlock(&ifmgd->mtx); 2629 assoc_bss = true; 2630 } else { 2631 bool not_auth_yet = false; 2632 2633 mutex_unlock(&ifmgd->mtx); 2634 2635 mutex_lock(&local->mtx); 2636 list_for_each_entry(wk, &local->work_list, list) { 2637 if (wk->sdata != sdata) 2638 continue; 2639 2640 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2641 wk->type != IEEE80211_WORK_AUTH && 2642 wk->type != IEEE80211_WORK_ASSOC && 2643 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2644 continue; 2645 2646 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2647 continue; 2648 2649 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2650 list_del_rcu(&wk->list); 2651 free_work(wk); 2652 break; 2653 } 2654 mutex_unlock(&local->mtx); 2655 2656 /* 2657 * If somebody requests authentication and we haven't 2658 * sent out an auth frame yet there's no need to send 2659 * out a deauth frame either. If the state was PROBE, 2660 * then this is the case. If it's AUTH we have sent a 2661 * frame, and if it's IDLE we have completed the auth 2662 * process already. 2663 */ 2664 if (not_auth_yet) { 2665 __cfg80211_auth_canceled(sdata->dev, bssid); 2666 return 0; 2667 } 2668 } 2669 2670 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2671 sdata->name, bssid, req->reason_code); 2672 2673 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2674 req->reason_code, cookie, 2675 !req->local_state_change); 2676 if (assoc_bss) 2677 sta_info_destroy_addr(sdata, bssid); 2678 2679 mutex_lock(&sdata->local->mtx); 2680 ieee80211_recalc_idle(sdata->local); 2681 mutex_unlock(&sdata->local->mtx); 2682 2683 return 0; 2684 } 2685 2686 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2687 struct cfg80211_disassoc_request *req, 2688 void *cookie) 2689 { 2690 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2691 u8 bssid[ETH_ALEN]; 2692 2693 mutex_lock(&ifmgd->mtx); 2694 2695 /* 2696 * cfg80211 should catch this ... but it's racy since 2697 * we can receive a disassoc frame, process it, hand it 2698 * to cfg80211 while that's in a locked section already 2699 * trying to tell us that the user wants to disconnect. 2700 */ 2701 if (ifmgd->associated != req->bss) { 2702 mutex_unlock(&ifmgd->mtx); 2703 return -ENOLINK; 2704 } 2705 2706 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2707 sdata->name, req->bss->bssid, req->reason_code); 2708 2709 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2710 ieee80211_set_disassoc(sdata, false, true); 2711 2712 mutex_unlock(&ifmgd->mtx); 2713 2714 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2715 IEEE80211_STYPE_DISASSOC, req->reason_code, 2716 cookie, !req->local_state_change); 2717 sta_info_destroy_addr(sdata, bssid); 2718 2719 mutex_lock(&sdata->local->mtx); 2720 ieee80211_recalc_idle(sdata->local); 2721 mutex_unlock(&sdata->local->mtx); 2722 2723 return 0; 2724 } 2725 2726 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2727 enum nl80211_cqm_rssi_threshold_event rssi_event, 2728 gfp_t gfp) 2729 { 2730 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2731 2732 trace_api_cqm_rssi_notify(sdata, rssi_event); 2733 2734 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2735 } 2736 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2737 2738 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 2739 { 2740 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2741 return sdata->dev->operstate; 2742 } 2743 EXPORT_SYMBOL(ieee80211_get_operstate); 2744