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 if (drv_conf_tx(local, queue, ¶ms)) 921 wiphy_debug(local->hw.wiphy, 922 "failed to set TX queue parameters for queue %d\n", 923 queue); 924 } 925 926 /* enable WMM or activate new settings */ 927 sdata->vif.bss_conf.qos = true; 928 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 929 } 930 931 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 932 u16 capab, bool erp_valid, u8 erp) 933 { 934 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 935 u32 changed = 0; 936 bool use_protection; 937 bool use_short_preamble; 938 bool use_short_slot; 939 940 if (erp_valid) { 941 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 942 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 943 } else { 944 use_protection = false; 945 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 946 } 947 948 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 949 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 950 use_short_slot = true; 951 952 if (use_protection != bss_conf->use_cts_prot) { 953 bss_conf->use_cts_prot = use_protection; 954 changed |= BSS_CHANGED_ERP_CTS_PROT; 955 } 956 957 if (use_short_preamble != bss_conf->use_short_preamble) { 958 bss_conf->use_short_preamble = use_short_preamble; 959 changed |= BSS_CHANGED_ERP_PREAMBLE; 960 } 961 962 if (use_short_slot != bss_conf->use_short_slot) { 963 bss_conf->use_short_slot = use_short_slot; 964 changed |= BSS_CHANGED_ERP_SLOT; 965 } 966 967 return changed; 968 } 969 970 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 971 struct cfg80211_bss *cbss, 972 u32 bss_info_changed) 973 { 974 struct ieee80211_bss *bss = (void *)cbss->priv; 975 struct ieee80211_local *local = sdata->local; 976 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 977 978 bss_info_changed |= BSS_CHANGED_ASSOC; 979 /* set timing information */ 980 bss_conf->beacon_int = cbss->beacon_interval; 981 bss_conf->timestamp = cbss->tsf; 982 983 bss_info_changed |= BSS_CHANGED_BEACON_INT; 984 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 985 cbss->capability, bss->has_erp_value, bss->erp_value); 986 987 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 988 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 989 990 sdata->u.mgd.associated = cbss; 991 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 992 993 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 994 995 /* just to be sure */ 996 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 997 IEEE80211_STA_BEACON_POLL); 998 999 ieee80211_led_assoc(local, 1); 1000 1001 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1002 bss_conf->dtim_period = bss->dtim_period; 1003 else 1004 bss_conf->dtim_period = 0; 1005 1006 bss_conf->assoc = 1; 1007 /* 1008 * For now just always ask the driver to update the basic rateset 1009 * when we have associated, we aren't checking whether it actually 1010 * changed or not. 1011 */ 1012 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1013 1014 /* And the BSSID changed - we're associated now */ 1015 bss_info_changed |= BSS_CHANGED_BSSID; 1016 1017 /* Tell the driver to monitor connection quality (if supported) */ 1018 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1019 bss_conf->cqm_rssi_thold) 1020 bss_info_changed |= BSS_CHANGED_CQM; 1021 1022 /* Enable ARP filtering */ 1023 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1024 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1025 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1026 } 1027 1028 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1029 1030 mutex_lock(&local->iflist_mtx); 1031 ieee80211_recalc_ps(local, -1); 1032 ieee80211_recalc_smps(local); 1033 mutex_unlock(&local->iflist_mtx); 1034 1035 netif_tx_start_all_queues(sdata->dev); 1036 netif_carrier_on(sdata->dev); 1037 } 1038 1039 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1040 bool remove_sta, bool tx) 1041 { 1042 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1043 struct ieee80211_local *local = sdata->local; 1044 struct sta_info *sta; 1045 u32 changed = 0, config_changed = 0; 1046 u8 bssid[ETH_ALEN]; 1047 1048 ASSERT_MGD_MTX(ifmgd); 1049 1050 if (WARN_ON(!ifmgd->associated)) 1051 return; 1052 1053 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1054 1055 ifmgd->associated = NULL; 1056 memset(ifmgd->bssid, 0, ETH_ALEN); 1057 1058 /* 1059 * we need to commit the associated = NULL change because the 1060 * scan code uses that to determine whether this iface should 1061 * go to/wake up from powersave or not -- and could otherwise 1062 * wake the queues erroneously. 1063 */ 1064 smp_mb(); 1065 1066 /* 1067 * Thus, we can only afterwards stop the queues -- to account 1068 * for the case where another CPU is finishing a scan at this 1069 * time -- we don't want the scan code to enable queues. 1070 */ 1071 1072 netif_tx_stop_all_queues(sdata->dev); 1073 netif_carrier_off(sdata->dev); 1074 1075 mutex_lock(&local->sta_mtx); 1076 sta = sta_info_get(sdata, bssid); 1077 if (sta) { 1078 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 1079 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1080 } 1081 mutex_unlock(&local->sta_mtx); 1082 1083 changed |= ieee80211_reset_erp_info(sdata); 1084 1085 ieee80211_led_assoc(local, 0); 1086 changed |= BSS_CHANGED_ASSOC; 1087 sdata->vif.bss_conf.assoc = false; 1088 1089 ieee80211_set_wmm_default(sdata); 1090 1091 /* channel(_type) changes are handled by ieee80211_hw_config */ 1092 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1093 1094 /* on the next assoc, re-program HT parameters */ 1095 sdata->ht_opmode_valid = false; 1096 1097 local->power_constr_level = 0; 1098 1099 del_timer_sync(&local->dynamic_ps_timer); 1100 cancel_work_sync(&local->dynamic_ps_enable_work); 1101 1102 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1103 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1104 config_changed |= IEEE80211_CONF_CHANGE_PS; 1105 } 1106 local->ps_sdata = NULL; 1107 1108 ieee80211_hw_config(local, config_changed); 1109 1110 /* Disable ARP filtering */ 1111 if (sdata->vif.bss_conf.arp_filter_enabled) { 1112 sdata->vif.bss_conf.arp_filter_enabled = false; 1113 changed |= BSS_CHANGED_ARP_FILTER; 1114 } 1115 1116 /* The BSSID (not really interesting) and HT changed */ 1117 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1118 ieee80211_bss_info_change_notify(sdata, changed); 1119 1120 if (remove_sta) 1121 sta_info_destroy_addr(sdata, bssid); 1122 1123 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1124 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1125 del_timer_sync(&sdata->u.mgd.timer); 1126 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1127 } 1128 1129 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1130 struct ieee80211_hdr *hdr) 1131 { 1132 /* 1133 * We can postpone the mgd.timer whenever receiving unicast frames 1134 * from AP because we know that the connection is working both ways 1135 * at that time. But multicast frames (and hence also beacons) must 1136 * be ignored here, because we need to trigger the timer during 1137 * data idle periods for sending the periodic probe request to the 1138 * AP we're connected to. 1139 */ 1140 if (is_multicast_ether_addr(hdr->addr1)) 1141 return; 1142 1143 ieee80211_sta_reset_conn_monitor(sdata); 1144 } 1145 1146 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1147 { 1148 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1149 1150 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1151 IEEE80211_STA_CONNECTION_POLL))) 1152 return; 1153 1154 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1155 IEEE80211_STA_BEACON_POLL); 1156 mutex_lock(&sdata->local->iflist_mtx); 1157 ieee80211_recalc_ps(sdata->local, -1); 1158 mutex_unlock(&sdata->local->iflist_mtx); 1159 1160 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1161 return; 1162 1163 /* 1164 * We've received a probe response, but are not sure whether 1165 * we have or will be receiving any beacons or data, so let's 1166 * schedule the timers again, just in case. 1167 */ 1168 ieee80211_sta_reset_beacon_monitor(sdata); 1169 1170 mod_timer(&ifmgd->conn_mon_timer, 1171 round_jiffies_up(jiffies + 1172 IEEE80211_CONNECTION_IDLE_TIME)); 1173 } 1174 1175 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1176 struct ieee80211_hdr *hdr, bool ack) 1177 { 1178 if (!ieee80211_is_data(hdr->frame_control)) 1179 return; 1180 1181 if (ack) 1182 ieee80211_sta_reset_conn_monitor(sdata); 1183 1184 if (ieee80211_is_nullfunc(hdr->frame_control) && 1185 sdata->u.mgd.probe_send_count > 0) { 1186 if (ack) 1187 sdata->u.mgd.probe_send_count = 0; 1188 else 1189 sdata->u.mgd.nullfunc_failed = true; 1190 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1191 } 1192 } 1193 1194 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1195 { 1196 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1197 const u8 *ssid; 1198 u8 *dst = ifmgd->associated->bssid; 1199 u8 unicast_limit = max(1, max_probe_tries - 3); 1200 1201 /* 1202 * Try sending broadcast probe requests for the last three 1203 * probe requests after the first ones failed since some 1204 * buggy APs only support broadcast probe requests. 1205 */ 1206 if (ifmgd->probe_send_count >= unicast_limit) 1207 dst = NULL; 1208 1209 /* 1210 * When the hardware reports an accurate Tx ACK status, it's 1211 * better to send a nullfunc frame instead of a probe request, 1212 * as it will kick us off the AP quickly if we aren't associated 1213 * anymore. The timeout will be reset if the frame is ACKed by 1214 * the AP. 1215 */ 1216 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1217 ifmgd->nullfunc_failed = false; 1218 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1219 } else { 1220 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1221 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0, 1222 true); 1223 } 1224 1225 ifmgd->probe_send_count++; 1226 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1227 run_again(ifmgd, ifmgd->probe_timeout); 1228 } 1229 1230 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1231 bool beacon) 1232 { 1233 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1234 bool already = false; 1235 1236 if (!ieee80211_sdata_running(sdata)) 1237 return; 1238 1239 if (sdata->local->scanning) 1240 return; 1241 1242 if (sdata->local->tmp_channel) 1243 return; 1244 1245 mutex_lock(&ifmgd->mtx); 1246 1247 if (!ifmgd->associated) 1248 goto out; 1249 1250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1251 if (beacon && net_ratelimit()) 1252 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1253 "- sending probe request\n", sdata->name); 1254 #endif 1255 1256 /* 1257 * The driver/our work has already reported this event or the 1258 * connection monitoring has kicked in and we have already sent 1259 * a probe request. Or maybe the AP died and the driver keeps 1260 * reporting until we disassociate... 1261 * 1262 * In either case we have to ignore the current call to this 1263 * function (except for setting the correct probe reason bit) 1264 * because otherwise we would reset the timer every time and 1265 * never check whether we received a probe response! 1266 */ 1267 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1268 IEEE80211_STA_CONNECTION_POLL)) 1269 already = true; 1270 1271 if (beacon) 1272 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1273 else 1274 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1275 1276 if (already) 1277 goto out; 1278 1279 mutex_lock(&sdata->local->iflist_mtx); 1280 ieee80211_recalc_ps(sdata->local, -1); 1281 mutex_unlock(&sdata->local->iflist_mtx); 1282 1283 ifmgd->probe_send_count = 0; 1284 ieee80211_mgd_probe_ap_send(sdata); 1285 out: 1286 mutex_unlock(&ifmgd->mtx); 1287 } 1288 1289 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1290 struct ieee80211_vif *vif) 1291 { 1292 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1293 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1294 struct sk_buff *skb; 1295 const u8 *ssid; 1296 1297 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1298 return NULL; 1299 1300 ASSERT_MGD_MTX(ifmgd); 1301 1302 if (!ifmgd->associated) 1303 return NULL; 1304 1305 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1306 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1307 ssid + 2, ssid[1], NULL, 0, true); 1308 1309 return skb; 1310 } 1311 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1312 1313 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1314 { 1315 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1316 struct ieee80211_local *local = sdata->local; 1317 u8 bssid[ETH_ALEN]; 1318 1319 mutex_lock(&ifmgd->mtx); 1320 if (!ifmgd->associated) { 1321 mutex_unlock(&ifmgd->mtx); 1322 return; 1323 } 1324 1325 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1326 1327 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1328 sdata->name, bssid); 1329 1330 ieee80211_set_disassoc(sdata, true, true); 1331 mutex_unlock(&ifmgd->mtx); 1332 1333 mutex_lock(&local->mtx); 1334 ieee80211_recalc_idle(local); 1335 mutex_unlock(&local->mtx); 1336 /* 1337 * must be outside lock due to cfg80211, 1338 * but that's not a problem. 1339 */ 1340 ieee80211_send_deauth_disassoc(sdata, bssid, 1341 IEEE80211_STYPE_DEAUTH, 1342 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1343 NULL, true); 1344 } 1345 1346 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1347 { 1348 struct ieee80211_sub_if_data *sdata = 1349 container_of(work, struct ieee80211_sub_if_data, 1350 u.mgd.beacon_connection_loss_work); 1351 1352 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1353 __ieee80211_connection_loss(sdata); 1354 else 1355 ieee80211_mgd_probe_ap(sdata, true); 1356 } 1357 1358 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1359 { 1360 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1361 struct ieee80211_hw *hw = &sdata->local->hw; 1362 1363 trace_api_beacon_loss(sdata); 1364 1365 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1366 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1367 } 1368 EXPORT_SYMBOL(ieee80211_beacon_loss); 1369 1370 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1371 { 1372 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1373 struct ieee80211_hw *hw = &sdata->local->hw; 1374 1375 trace_api_connection_loss(sdata); 1376 1377 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1378 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1379 } 1380 EXPORT_SYMBOL(ieee80211_connection_loss); 1381 1382 1383 static enum rx_mgmt_action __must_check 1384 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1385 struct ieee80211_mgmt *mgmt, size_t len) 1386 { 1387 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1388 const u8 *bssid = NULL; 1389 u16 reason_code; 1390 1391 if (len < 24 + 2) 1392 return RX_MGMT_NONE; 1393 1394 ASSERT_MGD_MTX(ifmgd); 1395 1396 bssid = ifmgd->associated->bssid; 1397 1398 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1399 1400 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1401 sdata->name, bssid, reason_code); 1402 1403 ieee80211_set_disassoc(sdata, true, false); 1404 mutex_lock(&sdata->local->mtx); 1405 ieee80211_recalc_idle(sdata->local); 1406 mutex_unlock(&sdata->local->mtx); 1407 1408 return RX_MGMT_CFG80211_DEAUTH; 1409 } 1410 1411 1412 static enum rx_mgmt_action __must_check 1413 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1414 struct ieee80211_mgmt *mgmt, size_t len) 1415 { 1416 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1417 u16 reason_code; 1418 1419 if (len < 24 + 2) 1420 return RX_MGMT_NONE; 1421 1422 ASSERT_MGD_MTX(ifmgd); 1423 1424 if (WARN_ON(!ifmgd->associated)) 1425 return RX_MGMT_NONE; 1426 1427 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1428 return RX_MGMT_NONE; 1429 1430 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1431 1432 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1433 sdata->name, mgmt->sa, reason_code); 1434 1435 ieee80211_set_disassoc(sdata, true, false); 1436 mutex_lock(&sdata->local->mtx); 1437 ieee80211_recalc_idle(sdata->local); 1438 mutex_unlock(&sdata->local->mtx); 1439 return RX_MGMT_CFG80211_DISASSOC; 1440 } 1441 1442 1443 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1444 struct ieee80211_mgmt *mgmt, size_t len) 1445 { 1446 struct ieee80211_sub_if_data *sdata = wk->sdata; 1447 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1448 struct ieee80211_local *local = sdata->local; 1449 struct ieee80211_supported_band *sband; 1450 struct sta_info *sta; 1451 struct cfg80211_bss *cbss = wk->assoc.bss; 1452 u8 *pos; 1453 u32 rates, basic_rates; 1454 u16 capab_info, aid; 1455 struct ieee802_11_elems elems; 1456 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1457 u32 changed = 0; 1458 int i, j, err; 1459 bool have_higher_than_11mbit = false; 1460 u16 ap_ht_cap_flags; 1461 1462 /* AssocResp and ReassocResp have identical structure */ 1463 1464 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1465 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1466 1467 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1468 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1469 "set\n", sdata->name, aid); 1470 aid &= ~(BIT(15) | BIT(14)); 1471 1472 pos = mgmt->u.assoc_resp.variable; 1473 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1474 1475 if (!elems.supp_rates) { 1476 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1477 sdata->name); 1478 return false; 1479 } 1480 1481 ifmgd->aid = aid; 1482 1483 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1484 if (!sta) { 1485 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1486 " the AP\n", sdata->name); 1487 return false; 1488 } 1489 1490 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1491 WLAN_STA_ASSOC_AP); 1492 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1493 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1494 1495 rates = 0; 1496 basic_rates = 0; 1497 sband = local->hw.wiphy->bands[wk->chan->band]; 1498 1499 for (i = 0; i < elems.supp_rates_len; i++) { 1500 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1501 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1502 1503 if (rate > 110) 1504 have_higher_than_11mbit = true; 1505 1506 for (j = 0; j < sband->n_bitrates; j++) { 1507 if (sband->bitrates[j].bitrate == rate) { 1508 rates |= BIT(j); 1509 if (is_basic) 1510 basic_rates |= BIT(j); 1511 break; 1512 } 1513 } 1514 } 1515 1516 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1517 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1518 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1519 1520 if (rate > 110) 1521 have_higher_than_11mbit = true; 1522 1523 for (j = 0; j < sband->n_bitrates; j++) { 1524 if (sband->bitrates[j].bitrate == rate) { 1525 rates |= BIT(j); 1526 if (is_basic) 1527 basic_rates |= BIT(j); 1528 break; 1529 } 1530 } 1531 } 1532 1533 sta->sta.supp_rates[wk->chan->band] = rates; 1534 sdata->vif.bss_conf.basic_rates = basic_rates; 1535 1536 /* cf. IEEE 802.11 9.2.12 */ 1537 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1538 have_higher_than_11mbit) 1539 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1540 else 1541 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1542 1543 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1544 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1545 elems.ht_cap_elem, &sta->sta.ht_cap); 1546 1547 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1548 1549 rate_control_rate_init(sta); 1550 1551 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1552 set_sta_flags(sta, WLAN_STA_MFP); 1553 1554 if (elems.wmm_param) 1555 set_sta_flags(sta, WLAN_STA_WME); 1556 1557 err = sta_info_insert(sta); 1558 sta = NULL; 1559 if (err) { 1560 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1561 " the AP (error %d)\n", sdata->name, err); 1562 return false; 1563 } 1564 1565 /* 1566 * Always handle WMM once after association regardless 1567 * of the first value the AP uses. Setting -1 here has 1568 * that effect because the AP values is an unsigned 1569 * 4-bit value. 1570 */ 1571 ifmgd->wmm_last_param_set = -1; 1572 1573 if (elems.wmm_param) 1574 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1575 elems.wmm_param_len); 1576 else 1577 ieee80211_set_wmm_default(sdata); 1578 1579 local->oper_channel = wk->chan; 1580 1581 if (elems.ht_info_elem && elems.wmm_param && 1582 (sdata->local->hw.queues >= 4) && 1583 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1584 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1585 cbss->bssid, ap_ht_cap_flags); 1586 1587 /* set AID and assoc capability, 1588 * ieee80211_set_associated() will tell the driver */ 1589 bss_conf->aid = aid; 1590 bss_conf->assoc_capability = capab_info; 1591 ieee80211_set_associated(sdata, cbss, changed); 1592 1593 /* 1594 * If we're using 4-addr mode, let the AP know that we're 1595 * doing so, so that it can create the STA VLAN on its side 1596 */ 1597 if (ifmgd->use_4addr) 1598 ieee80211_send_4addr_nullfunc(local, sdata); 1599 1600 /* 1601 * Start timer to probe the connection to the AP now. 1602 * Also start the timer that will detect beacon loss. 1603 */ 1604 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1605 ieee80211_sta_reset_beacon_monitor(sdata); 1606 1607 return true; 1608 } 1609 1610 1611 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1612 struct ieee80211_mgmt *mgmt, 1613 size_t len, 1614 struct ieee80211_rx_status *rx_status, 1615 struct ieee802_11_elems *elems, 1616 bool beacon) 1617 { 1618 struct ieee80211_local *local = sdata->local; 1619 int freq; 1620 struct ieee80211_bss *bss; 1621 struct ieee80211_channel *channel; 1622 bool need_ps = false; 1623 1624 if (sdata->u.mgd.associated) { 1625 bss = (void *)sdata->u.mgd.associated->priv; 1626 /* not previously set so we may need to recalc */ 1627 need_ps = !bss->dtim_period; 1628 } 1629 1630 if (elems->ds_params && elems->ds_params_len == 1) 1631 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1632 rx_status->band); 1633 else 1634 freq = rx_status->freq; 1635 1636 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1637 1638 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1639 return; 1640 1641 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1642 channel, beacon); 1643 if (bss) 1644 ieee80211_rx_bss_put(local, bss); 1645 1646 if (!sdata->u.mgd.associated) 1647 return; 1648 1649 if (need_ps) { 1650 mutex_lock(&local->iflist_mtx); 1651 ieee80211_recalc_ps(local, -1); 1652 mutex_unlock(&local->iflist_mtx); 1653 } 1654 1655 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1656 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1657 ETH_ALEN) == 0)) { 1658 struct ieee80211_channel_sw_ie *sw_elem = 1659 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1660 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1661 bss, rx_status->mactime); 1662 } 1663 } 1664 1665 1666 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1667 struct sk_buff *skb) 1668 { 1669 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1670 struct ieee80211_if_managed *ifmgd; 1671 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1672 size_t baselen, len = skb->len; 1673 struct ieee802_11_elems elems; 1674 1675 ifmgd = &sdata->u.mgd; 1676 1677 ASSERT_MGD_MTX(ifmgd); 1678 1679 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1680 return; /* ignore ProbeResp to foreign address */ 1681 1682 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1683 if (baselen > len) 1684 return; 1685 1686 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1687 &elems); 1688 1689 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1690 1691 if (ifmgd->associated && 1692 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1693 ieee80211_reset_ap_probe(sdata); 1694 } 1695 1696 /* 1697 * This is the canonical list of information elements we care about, 1698 * the filter code also gives us all changes to the Microsoft OUI 1699 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1700 * 1701 * We implement beacon filtering in software since that means we can 1702 * avoid processing the frame here and in cfg80211, and userspace 1703 * will not be able to tell whether the hardware supports it or not. 1704 * 1705 * XXX: This list needs to be dynamic -- userspace needs to be able to 1706 * add items it requires. It also needs to be able to tell us to 1707 * look out for other vendor IEs. 1708 */ 1709 static const u64 care_about_ies = 1710 (1ULL << WLAN_EID_COUNTRY) | 1711 (1ULL << WLAN_EID_ERP_INFO) | 1712 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1713 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1714 (1ULL << WLAN_EID_HT_CAPABILITY) | 1715 (1ULL << WLAN_EID_HT_INFORMATION); 1716 1717 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1718 struct ieee80211_mgmt *mgmt, 1719 size_t len, 1720 struct ieee80211_rx_status *rx_status) 1721 { 1722 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1723 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1724 size_t baselen; 1725 struct ieee802_11_elems elems; 1726 struct ieee80211_local *local = sdata->local; 1727 u32 changed = 0; 1728 bool erp_valid, directed_tim = false; 1729 u8 erp_value = 0; 1730 u32 ncrc; 1731 u8 *bssid; 1732 1733 ASSERT_MGD_MTX(ifmgd); 1734 1735 /* Process beacon from the current BSS */ 1736 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1737 if (baselen > len) 1738 return; 1739 1740 if (rx_status->freq != local->hw.conf.channel->center_freq) 1741 return; 1742 1743 /* 1744 * We might have received a number of frames, among them a 1745 * disassoc frame and a beacon... 1746 */ 1747 if (!ifmgd->associated) 1748 return; 1749 1750 bssid = ifmgd->associated->bssid; 1751 1752 /* 1753 * And in theory even frames from a different AP we were just 1754 * associated to a split-second ago! 1755 */ 1756 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1757 return; 1758 1759 /* Track average RSSI from the Beacon frames of the current AP */ 1760 ifmgd->last_beacon_signal = rx_status->signal; 1761 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1762 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1763 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1764 ifmgd->last_cqm_event_signal = 0; 1765 ifmgd->count_beacon_signal = 1; 1766 ifmgd->last_ave_beacon_signal = 0; 1767 } else { 1768 ifmgd->ave_beacon_signal = 1769 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1770 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1771 ifmgd->ave_beacon_signal) / 16; 1772 ifmgd->count_beacon_signal++; 1773 } 1774 1775 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 1776 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 1777 int sig = ifmgd->ave_beacon_signal; 1778 int last_sig = ifmgd->last_ave_beacon_signal; 1779 1780 /* 1781 * if signal crosses either of the boundaries, invoke callback 1782 * with appropriate parameters 1783 */ 1784 if (sig > ifmgd->rssi_max_thold && 1785 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 1786 ifmgd->last_ave_beacon_signal = sig; 1787 drv_rssi_callback(local, RSSI_EVENT_HIGH); 1788 } else if (sig < ifmgd->rssi_min_thold && 1789 (last_sig >= ifmgd->rssi_max_thold || 1790 last_sig == 0)) { 1791 ifmgd->last_ave_beacon_signal = sig; 1792 drv_rssi_callback(local, RSSI_EVENT_LOW); 1793 } 1794 } 1795 1796 if (bss_conf->cqm_rssi_thold && 1797 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1798 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1799 int sig = ifmgd->ave_beacon_signal / 16; 1800 int last_event = ifmgd->last_cqm_event_signal; 1801 int thold = bss_conf->cqm_rssi_thold; 1802 int hyst = bss_conf->cqm_rssi_hyst; 1803 if (sig < thold && 1804 (last_event == 0 || sig < last_event - hyst)) { 1805 ifmgd->last_cqm_event_signal = sig; 1806 ieee80211_cqm_rssi_notify( 1807 &sdata->vif, 1808 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1809 GFP_KERNEL); 1810 } else if (sig > thold && 1811 (last_event == 0 || sig > last_event + hyst)) { 1812 ifmgd->last_cqm_event_signal = sig; 1813 ieee80211_cqm_rssi_notify( 1814 &sdata->vif, 1815 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1816 GFP_KERNEL); 1817 } 1818 } 1819 1820 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1821 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1822 if (net_ratelimit()) { 1823 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1824 "to a received beacon\n", sdata->name); 1825 } 1826 #endif 1827 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1828 mutex_lock(&local->iflist_mtx); 1829 ieee80211_recalc_ps(local, -1); 1830 mutex_unlock(&local->iflist_mtx); 1831 } 1832 1833 /* 1834 * Push the beacon loss detection into the future since 1835 * we are processing a beacon from the AP just now. 1836 */ 1837 ieee80211_sta_reset_beacon_monitor(sdata); 1838 1839 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1840 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1841 len - baselen, &elems, 1842 care_about_ies, ncrc); 1843 1844 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1845 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1846 ifmgd->aid); 1847 1848 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1849 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1850 true); 1851 1852 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1853 elems.wmm_param_len); 1854 } 1855 1856 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1857 if (directed_tim) { 1858 if (local->hw.conf.dynamic_ps_timeout > 0) { 1859 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1860 ieee80211_hw_config(local, 1861 IEEE80211_CONF_CHANGE_PS); 1862 ieee80211_send_nullfunc(local, sdata, 0); 1863 } else { 1864 local->pspolling = true; 1865 1866 /* 1867 * Here is assumed that the driver will be 1868 * able to send ps-poll frame and receive a 1869 * response even though power save mode is 1870 * enabled, but some drivers might require 1871 * to disable power save here. This needs 1872 * to be investigated. 1873 */ 1874 ieee80211_send_pspoll(local, sdata); 1875 } 1876 } 1877 } 1878 1879 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1880 return; 1881 ifmgd->beacon_crc = ncrc; 1882 ifmgd->beacon_crc_valid = true; 1883 1884 if (elems.erp_info && elems.erp_info_len >= 1) { 1885 erp_valid = true; 1886 erp_value = elems.erp_info[0]; 1887 } else { 1888 erp_valid = false; 1889 } 1890 changed |= ieee80211_handle_bss_capability(sdata, 1891 le16_to_cpu(mgmt->u.beacon.capab_info), 1892 erp_valid, erp_value); 1893 1894 1895 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1896 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1897 struct sta_info *sta; 1898 struct ieee80211_supported_band *sband; 1899 u16 ap_ht_cap_flags; 1900 1901 rcu_read_lock(); 1902 1903 sta = sta_info_get(sdata, bssid); 1904 if (WARN_ON(!sta)) { 1905 rcu_read_unlock(); 1906 return; 1907 } 1908 1909 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1910 1911 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1912 elems.ht_cap_elem, &sta->sta.ht_cap); 1913 1914 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1915 1916 rcu_read_unlock(); 1917 1918 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1919 bssid, ap_ht_cap_flags); 1920 } 1921 1922 /* Note: country IE parsing is done for us by cfg80211 */ 1923 if (elems.country_elem) { 1924 /* TODO: IBSS also needs this */ 1925 if (elems.pwr_constr_elem) 1926 ieee80211_handle_pwr_constr(sdata, 1927 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1928 elems.pwr_constr_elem, 1929 elems.pwr_constr_elem_len); 1930 } 1931 1932 ieee80211_bss_info_change_notify(sdata, changed); 1933 } 1934 1935 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1936 struct sk_buff *skb) 1937 { 1938 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1939 struct ieee80211_rx_status *rx_status; 1940 struct ieee80211_mgmt *mgmt; 1941 enum rx_mgmt_action rma = RX_MGMT_NONE; 1942 u16 fc; 1943 1944 rx_status = (struct ieee80211_rx_status *) skb->cb; 1945 mgmt = (struct ieee80211_mgmt *) skb->data; 1946 fc = le16_to_cpu(mgmt->frame_control); 1947 1948 mutex_lock(&ifmgd->mtx); 1949 1950 if (ifmgd->associated && 1951 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1952 switch (fc & IEEE80211_FCTL_STYPE) { 1953 case IEEE80211_STYPE_BEACON: 1954 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1955 rx_status); 1956 break; 1957 case IEEE80211_STYPE_PROBE_RESP: 1958 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1959 break; 1960 case IEEE80211_STYPE_DEAUTH: 1961 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1962 break; 1963 case IEEE80211_STYPE_DISASSOC: 1964 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1965 break; 1966 case IEEE80211_STYPE_ACTION: 1967 switch (mgmt->u.action.category) { 1968 case WLAN_CATEGORY_SPECTRUM_MGMT: 1969 ieee80211_sta_process_chanswitch(sdata, 1970 &mgmt->u.action.u.chan_switch.sw_elem, 1971 (void *)ifmgd->associated->priv, 1972 rx_status->mactime); 1973 break; 1974 } 1975 } 1976 mutex_unlock(&ifmgd->mtx); 1977 1978 switch (rma) { 1979 case RX_MGMT_NONE: 1980 /* no action */ 1981 break; 1982 case RX_MGMT_CFG80211_DEAUTH: 1983 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1984 break; 1985 case RX_MGMT_CFG80211_DISASSOC: 1986 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1987 break; 1988 default: 1989 WARN(1, "unexpected: %d", rma); 1990 } 1991 return; 1992 } 1993 1994 mutex_unlock(&ifmgd->mtx); 1995 1996 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1997 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1998 struct ieee80211_local *local = sdata->local; 1999 struct ieee80211_work *wk; 2000 2001 mutex_lock(&local->mtx); 2002 list_for_each_entry(wk, &local->work_list, list) { 2003 if (wk->sdata != sdata) 2004 continue; 2005 2006 if (wk->type != IEEE80211_WORK_ASSOC && 2007 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2008 continue; 2009 2010 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 2011 continue; 2012 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 2013 continue; 2014 2015 /* 2016 * Printing the message only here means we can't 2017 * spuriously print it, but it also means that it 2018 * won't be printed when the frame comes in before 2019 * we even tried to associate or in similar cases. 2020 * 2021 * Ultimately, I suspect cfg80211 should print the 2022 * messages instead. 2023 */ 2024 printk(KERN_DEBUG 2025 "%s: deauthenticated from %pM (Reason: %u)\n", 2026 sdata->name, mgmt->bssid, 2027 le16_to_cpu(mgmt->u.deauth.reason_code)); 2028 2029 list_del_rcu(&wk->list); 2030 free_work(wk); 2031 break; 2032 } 2033 mutex_unlock(&local->mtx); 2034 2035 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2036 } 2037 } 2038 2039 static void ieee80211_sta_timer(unsigned long data) 2040 { 2041 struct ieee80211_sub_if_data *sdata = 2042 (struct ieee80211_sub_if_data *) data; 2043 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2044 struct ieee80211_local *local = sdata->local; 2045 2046 if (local->quiescing) { 2047 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2048 return; 2049 } 2050 2051 ieee80211_queue_work(&local->hw, &sdata->work); 2052 } 2053 2054 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2055 u8 *bssid, u8 reason) 2056 { 2057 struct ieee80211_local *local = sdata->local; 2058 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2059 2060 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2061 IEEE80211_STA_BEACON_POLL); 2062 2063 ieee80211_set_disassoc(sdata, true, true); 2064 mutex_unlock(&ifmgd->mtx); 2065 mutex_lock(&local->mtx); 2066 ieee80211_recalc_idle(local); 2067 mutex_unlock(&local->mtx); 2068 /* 2069 * must be outside lock due to cfg80211, 2070 * but that's not a problem. 2071 */ 2072 ieee80211_send_deauth_disassoc(sdata, bssid, 2073 IEEE80211_STYPE_DEAUTH, reason, 2074 NULL, true); 2075 mutex_lock(&ifmgd->mtx); 2076 } 2077 2078 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2079 { 2080 struct ieee80211_local *local = sdata->local; 2081 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2082 2083 /* then process the rest of the work */ 2084 mutex_lock(&ifmgd->mtx); 2085 2086 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2087 IEEE80211_STA_CONNECTION_POLL) && 2088 ifmgd->associated) { 2089 u8 bssid[ETH_ALEN]; 2090 int max_tries; 2091 2092 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2093 2094 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2095 max_tries = max_nullfunc_tries; 2096 else 2097 max_tries = max_probe_tries; 2098 2099 /* ACK received for nullfunc probing frame */ 2100 if (!ifmgd->probe_send_count) 2101 ieee80211_reset_ap_probe(sdata); 2102 else if (ifmgd->nullfunc_failed) { 2103 if (ifmgd->probe_send_count < max_tries) { 2104 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2105 wiphy_debug(local->hw.wiphy, 2106 "%s: No ack for nullfunc frame to" 2107 " AP %pM, try %d/%i\n", 2108 sdata->name, bssid, 2109 ifmgd->probe_send_count, max_tries); 2110 #endif 2111 ieee80211_mgd_probe_ap_send(sdata); 2112 } else { 2113 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2114 wiphy_debug(local->hw.wiphy, 2115 "%s: No ack for nullfunc frame to" 2116 " AP %pM, disconnecting.\n", 2117 sdata->name, bssid); 2118 #endif 2119 ieee80211_sta_connection_lost(sdata, bssid, 2120 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2121 } 2122 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2123 run_again(ifmgd, ifmgd->probe_timeout); 2124 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2125 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2126 wiphy_debug(local->hw.wiphy, 2127 "%s: Failed to send nullfunc to AP %pM" 2128 " after %dms, disconnecting.\n", 2129 sdata->name, 2130 bssid, probe_wait_ms); 2131 #endif 2132 ieee80211_sta_connection_lost(sdata, bssid, 2133 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2134 } else if (ifmgd->probe_send_count < max_tries) { 2135 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2136 wiphy_debug(local->hw.wiphy, 2137 "%s: No probe response from AP %pM" 2138 " after %dms, try %d/%i\n", 2139 sdata->name, 2140 bssid, probe_wait_ms, 2141 ifmgd->probe_send_count, max_tries); 2142 #endif 2143 ieee80211_mgd_probe_ap_send(sdata); 2144 } else { 2145 /* 2146 * We actually lost the connection ... or did we? 2147 * Let's make sure! 2148 */ 2149 wiphy_debug(local->hw.wiphy, 2150 "%s: No probe response from AP %pM" 2151 " after %dms, disconnecting.\n", 2152 sdata->name, 2153 bssid, probe_wait_ms); 2154 2155 ieee80211_sta_connection_lost(sdata, bssid, 2156 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2157 } 2158 } 2159 2160 mutex_unlock(&ifmgd->mtx); 2161 } 2162 2163 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2164 { 2165 struct ieee80211_sub_if_data *sdata = 2166 (struct ieee80211_sub_if_data *) data; 2167 struct ieee80211_local *local = sdata->local; 2168 2169 if (local->quiescing) 2170 return; 2171 2172 ieee80211_queue_work(&sdata->local->hw, 2173 &sdata->u.mgd.beacon_connection_loss_work); 2174 } 2175 2176 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2177 { 2178 struct ieee80211_sub_if_data *sdata = 2179 (struct ieee80211_sub_if_data *) data; 2180 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2181 struct ieee80211_local *local = sdata->local; 2182 2183 if (local->quiescing) 2184 return; 2185 2186 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2187 } 2188 2189 static void ieee80211_sta_monitor_work(struct work_struct *work) 2190 { 2191 struct ieee80211_sub_if_data *sdata = 2192 container_of(work, struct ieee80211_sub_if_data, 2193 u.mgd.monitor_work); 2194 2195 ieee80211_mgd_probe_ap(sdata, false); 2196 } 2197 2198 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2199 { 2200 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2201 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2202 IEEE80211_STA_CONNECTION_POLL); 2203 2204 /* let's probe the connection once */ 2205 ieee80211_queue_work(&sdata->local->hw, 2206 &sdata->u.mgd.monitor_work); 2207 /* and do all the other regular work too */ 2208 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2209 } 2210 } 2211 2212 #ifdef CONFIG_PM 2213 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2214 { 2215 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2216 2217 /* 2218 * we need to use atomic bitops for the running bits 2219 * only because both timers might fire at the same 2220 * time -- the code here is properly synchronised. 2221 */ 2222 2223 cancel_work_sync(&ifmgd->request_smps_work); 2224 2225 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2226 if (del_timer_sync(&ifmgd->timer)) 2227 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2228 2229 cancel_work_sync(&ifmgd->chswitch_work); 2230 if (del_timer_sync(&ifmgd->chswitch_timer)) 2231 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2232 2233 cancel_work_sync(&ifmgd->monitor_work); 2234 /* these will just be re-established on connection */ 2235 del_timer_sync(&ifmgd->conn_mon_timer); 2236 del_timer_sync(&ifmgd->bcn_mon_timer); 2237 } 2238 2239 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2240 { 2241 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2242 2243 if (!ifmgd->associated) 2244 return; 2245 2246 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2247 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2248 mutex_lock(&ifmgd->mtx); 2249 if (ifmgd->associated) { 2250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2251 wiphy_debug(sdata->local->hw.wiphy, 2252 "%s: driver requested disconnect after resume.\n", 2253 sdata->name); 2254 #endif 2255 ieee80211_sta_connection_lost(sdata, 2256 ifmgd->associated->bssid, 2257 WLAN_REASON_UNSPECIFIED); 2258 mutex_unlock(&ifmgd->mtx); 2259 return; 2260 } 2261 mutex_unlock(&ifmgd->mtx); 2262 } 2263 2264 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2265 add_timer(&ifmgd->timer); 2266 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2267 add_timer(&ifmgd->chswitch_timer); 2268 ieee80211_sta_reset_beacon_monitor(sdata); 2269 ieee80211_restart_sta_timer(sdata); 2270 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); 2271 } 2272 #endif 2273 2274 /* interface setup */ 2275 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2276 { 2277 struct ieee80211_if_managed *ifmgd; 2278 2279 ifmgd = &sdata->u.mgd; 2280 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2281 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2282 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2283 ieee80211_beacon_connection_loss_work); 2284 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2285 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2286 (unsigned long) sdata); 2287 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2288 (unsigned long) sdata); 2289 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2290 (unsigned long) sdata); 2291 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2292 (unsigned long) sdata); 2293 2294 ifmgd->flags = 0; 2295 2296 mutex_init(&ifmgd->mtx); 2297 2298 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2299 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2300 else 2301 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2302 } 2303 2304 /* scan finished notification */ 2305 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2306 { 2307 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2308 2309 /* Restart STA timers */ 2310 rcu_read_lock(); 2311 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2312 ieee80211_restart_sta_timer(sdata); 2313 rcu_read_unlock(); 2314 } 2315 2316 int ieee80211_max_network_latency(struct notifier_block *nb, 2317 unsigned long data, void *dummy) 2318 { 2319 s32 latency_usec = (s32) data; 2320 struct ieee80211_local *local = 2321 container_of(nb, struct ieee80211_local, 2322 network_latency_notifier); 2323 2324 mutex_lock(&local->iflist_mtx); 2325 ieee80211_recalc_ps(local, latency_usec); 2326 mutex_unlock(&local->iflist_mtx); 2327 2328 return 0; 2329 } 2330 2331 /* config hooks */ 2332 static enum work_done_result 2333 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2334 struct sk_buff *skb) 2335 { 2336 if (!skb) { 2337 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2338 return WORK_DONE_DESTROY; 2339 } 2340 2341 if (wk->type == IEEE80211_WORK_AUTH) { 2342 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2343 return WORK_DONE_DESTROY; 2344 } 2345 2346 mutex_lock(&wk->sdata->u.mgd.mtx); 2347 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2348 mutex_unlock(&wk->sdata->u.mgd.mtx); 2349 2350 wk->type = IEEE80211_WORK_AUTH; 2351 wk->probe_auth.tries = 0; 2352 return WORK_DONE_REQUEUE; 2353 } 2354 2355 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2356 struct cfg80211_auth_request *req) 2357 { 2358 const u8 *ssid; 2359 struct ieee80211_work *wk; 2360 u16 auth_alg; 2361 2362 if (req->local_state_change) 2363 return 0; /* no need to update mac80211 state */ 2364 2365 switch (req->auth_type) { 2366 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2367 auth_alg = WLAN_AUTH_OPEN; 2368 break; 2369 case NL80211_AUTHTYPE_SHARED_KEY: 2370 if (IS_ERR(sdata->local->wep_tx_tfm)) 2371 return -EOPNOTSUPP; 2372 auth_alg = WLAN_AUTH_SHARED_KEY; 2373 break; 2374 case NL80211_AUTHTYPE_FT: 2375 auth_alg = WLAN_AUTH_FT; 2376 break; 2377 case NL80211_AUTHTYPE_NETWORK_EAP: 2378 auth_alg = WLAN_AUTH_LEAP; 2379 break; 2380 default: 2381 return -EOPNOTSUPP; 2382 } 2383 2384 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2385 if (!wk) 2386 return -ENOMEM; 2387 2388 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2389 2390 if (req->ie && req->ie_len) { 2391 memcpy(wk->ie, req->ie, req->ie_len); 2392 wk->ie_len = req->ie_len; 2393 } 2394 2395 if (req->key && req->key_len) { 2396 wk->probe_auth.key_len = req->key_len; 2397 wk->probe_auth.key_idx = req->key_idx; 2398 memcpy(wk->probe_auth.key, req->key, req->key_len); 2399 } 2400 2401 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2402 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2403 wk->probe_auth.ssid_len = ssid[1]; 2404 2405 wk->probe_auth.algorithm = auth_alg; 2406 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2407 2408 /* if we already have a probe, don't probe again */ 2409 if (req->bss->proberesp_ies) 2410 wk->type = IEEE80211_WORK_AUTH; 2411 else 2412 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2413 wk->chan = req->bss->channel; 2414 wk->chan_type = NL80211_CHAN_NO_HT; 2415 wk->sdata = sdata; 2416 wk->done = ieee80211_probe_auth_done; 2417 2418 ieee80211_add_work(wk); 2419 return 0; 2420 } 2421 2422 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2423 struct sk_buff *skb) 2424 { 2425 struct ieee80211_mgmt *mgmt; 2426 struct ieee80211_rx_status *rx_status; 2427 struct ieee802_11_elems elems; 2428 u16 status; 2429 2430 if (!skb) { 2431 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2432 return WORK_DONE_DESTROY; 2433 } 2434 2435 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2436 mutex_lock(&wk->sdata->u.mgd.mtx); 2437 rx_status = (void *) skb->cb; 2438 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2439 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2440 &elems, true); 2441 mutex_unlock(&wk->sdata->u.mgd.mtx); 2442 2443 wk->type = IEEE80211_WORK_ASSOC; 2444 /* not really done yet */ 2445 return WORK_DONE_REQUEUE; 2446 } 2447 2448 mgmt = (void *)skb->data; 2449 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2450 2451 if (status == WLAN_STATUS_SUCCESS) { 2452 mutex_lock(&wk->sdata->u.mgd.mtx); 2453 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2454 mutex_unlock(&wk->sdata->u.mgd.mtx); 2455 /* oops -- internal error -- send timeout for now */ 2456 cfg80211_send_assoc_timeout(wk->sdata->dev, 2457 wk->filter_ta); 2458 return WORK_DONE_DESTROY; 2459 } 2460 2461 mutex_unlock(&wk->sdata->u.mgd.mtx); 2462 } 2463 2464 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2465 return WORK_DONE_DESTROY; 2466 } 2467 2468 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2469 struct cfg80211_assoc_request *req) 2470 { 2471 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2472 struct ieee80211_bss *bss = (void *)req->bss->priv; 2473 struct ieee80211_work *wk; 2474 const u8 *ssid; 2475 int i; 2476 2477 mutex_lock(&ifmgd->mtx); 2478 if (ifmgd->associated) { 2479 if (!req->prev_bssid || 2480 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2481 ETH_ALEN)) { 2482 /* 2483 * We are already associated and the request was not a 2484 * reassociation request from the current BSS, so 2485 * reject it. 2486 */ 2487 mutex_unlock(&ifmgd->mtx); 2488 return -EALREADY; 2489 } 2490 2491 /* Trying to reassociate - clear previous association state */ 2492 ieee80211_set_disassoc(sdata, true, false); 2493 } 2494 mutex_unlock(&ifmgd->mtx); 2495 2496 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2497 if (!wk) 2498 return -ENOMEM; 2499 2500 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2501 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2502 2503 ifmgd->beacon_crc_valid = false; 2504 2505 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2506 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2507 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2508 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2509 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2510 2511 2512 if (req->ie && req->ie_len) { 2513 memcpy(wk->ie, req->ie, req->ie_len); 2514 wk->ie_len = req->ie_len; 2515 } else 2516 wk->ie_len = 0; 2517 2518 wk->assoc.bss = req->bss; 2519 2520 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2521 2522 /* new association always uses requested smps mode */ 2523 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2524 if (ifmgd->powersave) 2525 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2526 else 2527 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2528 } else 2529 ifmgd->ap_smps = ifmgd->req_smps; 2530 2531 wk->assoc.smps = ifmgd->ap_smps; 2532 /* 2533 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2534 * We still associate in non-HT mode (11a/b/g) if any one of these 2535 * ciphers is configured as pairwise. 2536 * We can set this to true for non-11n hardware, that'll be checked 2537 * separately along with the peer capabilities. 2538 */ 2539 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2540 wk->assoc.capability = req->bss->capability; 2541 wk->assoc.wmm_used = bss->wmm_used; 2542 wk->assoc.supp_rates = bss->supp_rates; 2543 wk->assoc.supp_rates_len = bss->supp_rates_len; 2544 wk->assoc.ht_information_ie = 2545 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2546 2547 if (bss->wmm_used && bss->uapsd_supported && 2548 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2549 wk->assoc.uapsd_used = true; 2550 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2551 } else { 2552 wk->assoc.uapsd_used = false; 2553 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2554 } 2555 2556 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2557 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2558 wk->assoc.ssid_len = ssid[1]; 2559 2560 if (req->prev_bssid) 2561 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2562 2563 wk->chan = req->bss->channel; 2564 wk->chan_type = NL80211_CHAN_NO_HT; 2565 wk->sdata = sdata; 2566 wk->done = ieee80211_assoc_done; 2567 if (!bss->dtim_period && 2568 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2569 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2570 else 2571 wk->type = IEEE80211_WORK_ASSOC; 2572 2573 if (req->use_mfp) { 2574 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2575 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2576 } else { 2577 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2578 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2579 } 2580 2581 if (req->crypto.control_port) 2582 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2583 else 2584 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2585 2586 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2587 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2588 2589 ieee80211_add_work(wk); 2590 return 0; 2591 } 2592 2593 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2594 struct cfg80211_deauth_request *req, 2595 void *cookie) 2596 { 2597 struct ieee80211_local *local = sdata->local; 2598 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2599 struct ieee80211_work *wk; 2600 u8 bssid[ETH_ALEN]; 2601 bool assoc_bss = false; 2602 2603 mutex_lock(&ifmgd->mtx); 2604 2605 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2606 if (ifmgd->associated == req->bss) { 2607 ieee80211_set_disassoc(sdata, false, true); 2608 mutex_unlock(&ifmgd->mtx); 2609 assoc_bss = true; 2610 } else { 2611 bool not_auth_yet = false; 2612 2613 mutex_unlock(&ifmgd->mtx); 2614 2615 mutex_lock(&local->mtx); 2616 list_for_each_entry(wk, &local->work_list, list) { 2617 if (wk->sdata != sdata) 2618 continue; 2619 2620 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2621 wk->type != IEEE80211_WORK_AUTH && 2622 wk->type != IEEE80211_WORK_ASSOC && 2623 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2624 continue; 2625 2626 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2627 continue; 2628 2629 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2630 list_del_rcu(&wk->list); 2631 free_work(wk); 2632 break; 2633 } 2634 mutex_unlock(&local->mtx); 2635 2636 /* 2637 * If somebody requests authentication and we haven't 2638 * sent out an auth frame yet there's no need to send 2639 * out a deauth frame either. If the state was PROBE, 2640 * then this is the case. If it's AUTH we have sent a 2641 * frame, and if it's IDLE we have completed the auth 2642 * process already. 2643 */ 2644 if (not_auth_yet) { 2645 __cfg80211_auth_canceled(sdata->dev, bssid); 2646 return 0; 2647 } 2648 } 2649 2650 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2651 sdata->name, bssid, req->reason_code); 2652 2653 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2654 req->reason_code, cookie, 2655 !req->local_state_change); 2656 if (assoc_bss) 2657 sta_info_destroy_addr(sdata, bssid); 2658 2659 mutex_lock(&sdata->local->mtx); 2660 ieee80211_recalc_idle(sdata->local); 2661 mutex_unlock(&sdata->local->mtx); 2662 2663 return 0; 2664 } 2665 2666 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2667 struct cfg80211_disassoc_request *req, 2668 void *cookie) 2669 { 2670 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2671 u8 bssid[ETH_ALEN]; 2672 2673 mutex_lock(&ifmgd->mtx); 2674 2675 /* 2676 * cfg80211 should catch this ... but it's racy since 2677 * we can receive a disassoc frame, process it, hand it 2678 * to cfg80211 while that's in a locked section already 2679 * trying to tell us that the user wants to disconnect. 2680 */ 2681 if (ifmgd->associated != req->bss) { 2682 mutex_unlock(&ifmgd->mtx); 2683 return -ENOLINK; 2684 } 2685 2686 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2687 sdata->name, req->bss->bssid, req->reason_code); 2688 2689 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2690 ieee80211_set_disassoc(sdata, false, true); 2691 2692 mutex_unlock(&ifmgd->mtx); 2693 2694 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2695 IEEE80211_STYPE_DISASSOC, req->reason_code, 2696 cookie, !req->local_state_change); 2697 sta_info_destroy_addr(sdata, bssid); 2698 2699 mutex_lock(&sdata->local->mtx); 2700 ieee80211_recalc_idle(sdata->local); 2701 mutex_unlock(&sdata->local->mtx); 2702 2703 return 0; 2704 } 2705 2706 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2707 enum nl80211_cqm_rssi_threshold_event rssi_event, 2708 gfp_t gfp) 2709 { 2710 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2711 2712 trace_api_cqm_rssi_notify(sdata, rssi_event); 2713 2714 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2715 } 2716 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2717 2718 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 2719 { 2720 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2721 return sdata->dev->operstate; 2722 } 2723 EXPORT_SYMBOL(ieee80211_get_operstate); 2724