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 = &sdata->u.mgd; 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 if (local->hw.conf.flags & IEEE80211_CONF_PS) 761 return; 762 763 /* 764 * transmission can be stopped by others which leads to 765 * dynamic_ps_timer expiry. Postpond the ps timer if it 766 * is not the actual idle state. 767 */ 768 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 769 for (q = 0; q < local->hw.queues; q++) { 770 if (local->queue_stop_reasons[q]) { 771 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 772 flags); 773 mod_timer(&local->dynamic_ps_timer, jiffies + 774 msecs_to_jiffies( 775 local->hw.conf.dynamic_ps_timeout)); 776 return; 777 } 778 } 779 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 780 781 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 782 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 783 netif_tx_stop_all_queues(sdata->dev); 784 785 if (drv_tx_frames_pending(local)) 786 mod_timer(&local->dynamic_ps_timer, jiffies + 787 msecs_to_jiffies( 788 local->hw.conf.dynamic_ps_timeout)); 789 else { 790 ieee80211_send_nullfunc(local, sdata, 1); 791 /* Flush to get the tx status of nullfunc frame */ 792 drv_flush(local, false); 793 } 794 } 795 796 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 797 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 798 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 799 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 800 local->hw.conf.flags |= IEEE80211_CONF_PS; 801 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 802 } 803 804 netif_tx_wake_all_queues(sdata->dev); 805 } 806 807 void ieee80211_dynamic_ps_timer(unsigned long data) 808 { 809 struct ieee80211_local *local = (void *) data; 810 811 if (local->quiescing || local->suspended) 812 return; 813 814 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 815 } 816 817 /* MLME */ 818 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 819 struct ieee80211_sub_if_data *sdata, 820 u8 *wmm_param, size_t wmm_param_len) 821 { 822 struct ieee80211_tx_queue_params params; 823 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 824 size_t left; 825 int count; 826 u8 *pos, uapsd_queues = 0; 827 828 if (!local->ops->conf_tx) 829 return; 830 831 if (local->hw.queues < 4) 832 return; 833 834 if (!wmm_param) 835 return; 836 837 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 838 return; 839 840 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 841 uapsd_queues = local->uapsd_queues; 842 843 count = wmm_param[6] & 0x0f; 844 if (count == ifmgd->wmm_last_param_set) 845 return; 846 ifmgd->wmm_last_param_set = count; 847 848 pos = wmm_param + 8; 849 left = wmm_param_len - 8; 850 851 memset(¶ms, 0, sizeof(params)); 852 853 local->wmm_acm = 0; 854 for (; left >= 4; left -= 4, pos += 4) { 855 int aci = (pos[0] >> 5) & 0x03; 856 int acm = (pos[0] >> 4) & 0x01; 857 bool uapsd = false; 858 int queue; 859 860 switch (aci) { 861 case 1: /* AC_BK */ 862 queue = 3; 863 if (acm) 864 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 865 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 866 uapsd = true; 867 break; 868 case 2: /* AC_VI */ 869 queue = 1; 870 if (acm) 871 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 872 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 873 uapsd = true; 874 break; 875 case 3: /* AC_VO */ 876 queue = 0; 877 if (acm) 878 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 879 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 880 uapsd = true; 881 break; 882 case 0: /* AC_BE */ 883 default: 884 queue = 2; 885 if (acm) 886 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 887 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 888 uapsd = true; 889 break; 890 } 891 892 params.aifs = pos[0] & 0x0f; 893 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 894 params.cw_min = ecw2cw(pos[1] & 0x0f); 895 params.txop = get_unaligned_le16(pos + 2); 896 params.uapsd = uapsd; 897 898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 899 wiphy_debug(local->hw.wiphy, 900 "WMM queue=%d aci=%d acm=%d aifs=%d " 901 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 902 queue, aci, acm, 903 params.aifs, params.cw_min, params.cw_max, 904 params.txop, params.uapsd); 905 #endif 906 if (drv_conf_tx(local, queue, ¶ms)) 907 wiphy_debug(local->hw.wiphy, 908 "failed to set TX queue parameters for queue %d\n", 909 queue); 910 } 911 912 /* enable WMM or activate new settings */ 913 sdata->vif.bss_conf.qos = true; 914 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 915 } 916 917 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 918 u16 capab, bool erp_valid, u8 erp) 919 { 920 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 921 u32 changed = 0; 922 bool use_protection; 923 bool use_short_preamble; 924 bool use_short_slot; 925 926 if (erp_valid) { 927 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 928 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 929 } else { 930 use_protection = false; 931 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 932 } 933 934 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 935 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 936 use_short_slot = true; 937 938 if (use_protection != bss_conf->use_cts_prot) { 939 bss_conf->use_cts_prot = use_protection; 940 changed |= BSS_CHANGED_ERP_CTS_PROT; 941 } 942 943 if (use_short_preamble != bss_conf->use_short_preamble) { 944 bss_conf->use_short_preamble = use_short_preamble; 945 changed |= BSS_CHANGED_ERP_PREAMBLE; 946 } 947 948 if (use_short_slot != bss_conf->use_short_slot) { 949 bss_conf->use_short_slot = use_short_slot; 950 changed |= BSS_CHANGED_ERP_SLOT; 951 } 952 953 return changed; 954 } 955 956 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 957 struct cfg80211_bss *cbss, 958 u32 bss_info_changed) 959 { 960 struct ieee80211_bss *bss = (void *)cbss->priv; 961 struct ieee80211_local *local = sdata->local; 962 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 963 964 bss_info_changed |= BSS_CHANGED_ASSOC; 965 /* set timing information */ 966 bss_conf->beacon_int = cbss->beacon_interval; 967 bss_conf->timestamp = cbss->tsf; 968 969 bss_info_changed |= BSS_CHANGED_BEACON_INT; 970 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 971 cbss->capability, bss->has_erp_value, bss->erp_value); 972 973 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 974 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 975 976 sdata->u.mgd.associated = cbss; 977 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 978 979 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 980 981 /* just to be sure */ 982 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 983 IEEE80211_STA_BEACON_POLL); 984 985 ieee80211_led_assoc(local, 1); 986 987 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 988 bss_conf->dtim_period = bss->dtim_period; 989 else 990 bss_conf->dtim_period = 0; 991 992 bss_conf->assoc = 1; 993 /* 994 * For now just always ask the driver to update the basic rateset 995 * when we have associated, we aren't checking whether it actually 996 * changed or not. 997 */ 998 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 999 1000 /* And the BSSID changed - we're associated now */ 1001 bss_info_changed |= BSS_CHANGED_BSSID; 1002 1003 /* Tell the driver to monitor connection quality (if supported) */ 1004 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1005 bss_conf->cqm_rssi_thold) 1006 bss_info_changed |= BSS_CHANGED_CQM; 1007 1008 /* Enable ARP filtering */ 1009 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1010 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1011 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1012 } 1013 1014 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1015 1016 mutex_lock(&local->iflist_mtx); 1017 ieee80211_recalc_ps(local, -1); 1018 ieee80211_recalc_smps(local); 1019 mutex_unlock(&local->iflist_mtx); 1020 1021 netif_tx_start_all_queues(sdata->dev); 1022 netif_carrier_on(sdata->dev); 1023 } 1024 1025 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1026 bool remove_sta, bool tx) 1027 { 1028 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1029 struct ieee80211_local *local = sdata->local; 1030 struct sta_info *sta; 1031 u32 changed = 0, config_changed = 0; 1032 u8 bssid[ETH_ALEN]; 1033 1034 ASSERT_MGD_MTX(ifmgd); 1035 1036 if (WARN_ON(!ifmgd->associated)) 1037 return; 1038 1039 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1040 1041 ifmgd->associated = NULL; 1042 memset(ifmgd->bssid, 0, ETH_ALEN); 1043 1044 /* 1045 * we need to commit the associated = NULL change because the 1046 * scan code uses that to determine whether this iface should 1047 * go to/wake up from powersave or not -- and could otherwise 1048 * wake the queues erroneously. 1049 */ 1050 smp_mb(); 1051 1052 /* 1053 * Thus, we can only afterwards stop the queues -- to account 1054 * for the case where another CPU is finishing a scan at this 1055 * time -- we don't want the scan code to enable queues. 1056 */ 1057 1058 netif_tx_stop_all_queues(sdata->dev); 1059 netif_carrier_off(sdata->dev); 1060 1061 mutex_lock(&local->sta_mtx); 1062 sta = sta_info_get(sdata, bssid); 1063 if (sta) { 1064 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 1065 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1066 } 1067 mutex_unlock(&local->sta_mtx); 1068 1069 changed |= ieee80211_reset_erp_info(sdata); 1070 1071 ieee80211_led_assoc(local, 0); 1072 changed |= BSS_CHANGED_ASSOC; 1073 sdata->vif.bss_conf.assoc = false; 1074 1075 ieee80211_set_wmm_default(sdata); 1076 1077 /* channel(_type) changes are handled by ieee80211_hw_config */ 1078 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1079 1080 /* on the next assoc, re-program HT parameters */ 1081 sdata->ht_opmode_valid = false; 1082 1083 local->power_constr_level = 0; 1084 1085 del_timer_sync(&local->dynamic_ps_timer); 1086 cancel_work_sync(&local->dynamic_ps_enable_work); 1087 1088 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1089 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1090 config_changed |= IEEE80211_CONF_CHANGE_PS; 1091 } 1092 local->ps_sdata = NULL; 1093 1094 ieee80211_hw_config(local, config_changed); 1095 1096 /* Disable ARP filtering */ 1097 if (sdata->vif.bss_conf.arp_filter_enabled) { 1098 sdata->vif.bss_conf.arp_filter_enabled = false; 1099 changed |= BSS_CHANGED_ARP_FILTER; 1100 } 1101 1102 /* The BSSID (not really interesting) and HT changed */ 1103 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1104 ieee80211_bss_info_change_notify(sdata, changed); 1105 1106 if (remove_sta) 1107 sta_info_destroy_addr(sdata, bssid); 1108 1109 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1110 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1111 del_timer_sync(&sdata->u.mgd.timer); 1112 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1113 } 1114 1115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1116 struct ieee80211_hdr *hdr) 1117 { 1118 /* 1119 * We can postpone the mgd.timer whenever receiving unicast frames 1120 * from AP because we know that the connection is working both ways 1121 * at that time. But multicast frames (and hence also beacons) must 1122 * be ignored here, because we need to trigger the timer during 1123 * data idle periods for sending the periodic probe request to the 1124 * AP we're connected to. 1125 */ 1126 if (is_multicast_ether_addr(hdr->addr1)) 1127 return; 1128 1129 ieee80211_sta_reset_conn_monitor(sdata); 1130 } 1131 1132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1133 { 1134 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1135 1136 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1137 IEEE80211_STA_CONNECTION_POLL))) 1138 return; 1139 1140 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1141 IEEE80211_STA_BEACON_POLL); 1142 mutex_lock(&sdata->local->iflist_mtx); 1143 ieee80211_recalc_ps(sdata->local, -1); 1144 mutex_unlock(&sdata->local->iflist_mtx); 1145 1146 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1147 return; 1148 1149 /* 1150 * We've received a probe response, but are not sure whether 1151 * we have or will be receiving any beacons or data, so let's 1152 * schedule the timers again, just in case. 1153 */ 1154 ieee80211_sta_reset_beacon_monitor(sdata); 1155 1156 mod_timer(&ifmgd->conn_mon_timer, 1157 round_jiffies_up(jiffies + 1158 IEEE80211_CONNECTION_IDLE_TIME)); 1159 } 1160 1161 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1162 struct ieee80211_hdr *hdr, bool ack) 1163 { 1164 if (!ieee80211_is_data(hdr->frame_control)) 1165 return; 1166 1167 if (ack) 1168 ieee80211_sta_reset_conn_monitor(sdata); 1169 1170 if (ieee80211_is_nullfunc(hdr->frame_control) && 1171 sdata->u.mgd.probe_send_count > 0) { 1172 if (ack) 1173 sdata->u.mgd.probe_send_count = 0; 1174 else 1175 sdata->u.mgd.nullfunc_failed = true; 1176 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1177 } 1178 } 1179 1180 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1181 { 1182 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1183 const u8 *ssid; 1184 u8 *dst = ifmgd->associated->bssid; 1185 u8 unicast_limit = max(1, max_probe_tries - 3); 1186 1187 /* 1188 * Try sending broadcast probe requests for the last three 1189 * probe requests after the first ones failed since some 1190 * buggy APs only support broadcast probe requests. 1191 */ 1192 if (ifmgd->probe_send_count >= unicast_limit) 1193 dst = NULL; 1194 1195 /* 1196 * When the hardware reports an accurate Tx ACK status, it's 1197 * better to send a nullfunc frame instead of a probe request, 1198 * as it will kick us off the AP quickly if we aren't associated 1199 * anymore. The timeout will be reset if the frame is ACKed by 1200 * the AP. 1201 */ 1202 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1203 ifmgd->nullfunc_failed = false; 1204 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1205 } else { 1206 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1207 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1208 } 1209 1210 ifmgd->probe_send_count++; 1211 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1212 run_again(ifmgd, ifmgd->probe_timeout); 1213 } 1214 1215 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1216 bool beacon) 1217 { 1218 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1219 bool already = false; 1220 1221 if (!ieee80211_sdata_running(sdata)) 1222 return; 1223 1224 if (sdata->local->scanning) 1225 return; 1226 1227 if (sdata->local->tmp_channel) 1228 return; 1229 1230 mutex_lock(&ifmgd->mtx); 1231 1232 if (!ifmgd->associated) 1233 goto out; 1234 1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1236 if (beacon && net_ratelimit()) 1237 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1238 "- sending probe request\n", sdata->name); 1239 #endif 1240 1241 /* 1242 * The driver/our work has already reported this event or the 1243 * connection monitoring has kicked in and we have already sent 1244 * a probe request. Or maybe the AP died and the driver keeps 1245 * reporting until we disassociate... 1246 * 1247 * In either case we have to ignore the current call to this 1248 * function (except for setting the correct probe reason bit) 1249 * because otherwise we would reset the timer every time and 1250 * never check whether we received a probe response! 1251 */ 1252 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1253 IEEE80211_STA_CONNECTION_POLL)) 1254 already = true; 1255 1256 if (beacon) 1257 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1258 else 1259 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1260 1261 if (already) 1262 goto out; 1263 1264 mutex_lock(&sdata->local->iflist_mtx); 1265 ieee80211_recalc_ps(sdata->local, -1); 1266 mutex_unlock(&sdata->local->iflist_mtx); 1267 1268 ifmgd->probe_send_count = 0; 1269 ieee80211_mgd_probe_ap_send(sdata); 1270 out: 1271 mutex_unlock(&ifmgd->mtx); 1272 } 1273 1274 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1275 struct ieee80211_vif *vif) 1276 { 1277 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1279 struct sk_buff *skb; 1280 const u8 *ssid; 1281 1282 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1283 return NULL; 1284 1285 ASSERT_MGD_MTX(ifmgd); 1286 1287 if (!ifmgd->associated) 1288 return NULL; 1289 1290 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1291 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1292 ssid + 2, ssid[1], NULL, 0); 1293 1294 return skb; 1295 } 1296 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1297 1298 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1299 { 1300 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1301 struct ieee80211_local *local = sdata->local; 1302 u8 bssid[ETH_ALEN]; 1303 1304 mutex_lock(&ifmgd->mtx); 1305 if (!ifmgd->associated) { 1306 mutex_unlock(&ifmgd->mtx); 1307 return; 1308 } 1309 1310 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1311 1312 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1313 sdata->name, bssid); 1314 1315 ieee80211_set_disassoc(sdata, true, true); 1316 mutex_unlock(&ifmgd->mtx); 1317 1318 mutex_lock(&local->mtx); 1319 ieee80211_recalc_idle(local); 1320 mutex_unlock(&local->mtx); 1321 /* 1322 * must be outside lock due to cfg80211, 1323 * but that's not a problem. 1324 */ 1325 ieee80211_send_deauth_disassoc(sdata, bssid, 1326 IEEE80211_STYPE_DEAUTH, 1327 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1328 NULL, true); 1329 } 1330 1331 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1332 { 1333 struct ieee80211_sub_if_data *sdata = 1334 container_of(work, struct ieee80211_sub_if_data, 1335 u.mgd.beacon_connection_loss_work); 1336 1337 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1338 __ieee80211_connection_loss(sdata); 1339 else 1340 ieee80211_mgd_probe_ap(sdata, true); 1341 } 1342 1343 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1344 { 1345 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1346 struct ieee80211_hw *hw = &sdata->local->hw; 1347 1348 trace_api_beacon_loss(sdata); 1349 1350 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1351 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1352 } 1353 EXPORT_SYMBOL(ieee80211_beacon_loss); 1354 1355 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1356 { 1357 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1358 struct ieee80211_hw *hw = &sdata->local->hw; 1359 1360 trace_api_connection_loss(sdata); 1361 1362 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1363 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1364 } 1365 EXPORT_SYMBOL(ieee80211_connection_loss); 1366 1367 1368 static enum rx_mgmt_action __must_check 1369 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1370 struct ieee80211_mgmt *mgmt, size_t len) 1371 { 1372 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1373 const u8 *bssid = NULL; 1374 u16 reason_code; 1375 1376 if (len < 24 + 2) 1377 return RX_MGMT_NONE; 1378 1379 ASSERT_MGD_MTX(ifmgd); 1380 1381 bssid = ifmgd->associated->bssid; 1382 1383 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1384 1385 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1386 sdata->name, bssid, reason_code); 1387 1388 ieee80211_set_disassoc(sdata, true, false); 1389 mutex_lock(&sdata->local->mtx); 1390 ieee80211_recalc_idle(sdata->local); 1391 mutex_unlock(&sdata->local->mtx); 1392 1393 return RX_MGMT_CFG80211_DEAUTH; 1394 } 1395 1396 1397 static enum rx_mgmt_action __must_check 1398 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1399 struct ieee80211_mgmt *mgmt, size_t len) 1400 { 1401 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1402 u16 reason_code; 1403 1404 if (len < 24 + 2) 1405 return RX_MGMT_NONE; 1406 1407 ASSERT_MGD_MTX(ifmgd); 1408 1409 if (WARN_ON(!ifmgd->associated)) 1410 return RX_MGMT_NONE; 1411 1412 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1413 return RX_MGMT_NONE; 1414 1415 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1416 1417 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1418 sdata->name, mgmt->sa, reason_code); 1419 1420 ieee80211_set_disassoc(sdata, true, false); 1421 mutex_lock(&sdata->local->mtx); 1422 ieee80211_recalc_idle(sdata->local); 1423 mutex_unlock(&sdata->local->mtx); 1424 return RX_MGMT_CFG80211_DISASSOC; 1425 } 1426 1427 1428 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1429 struct ieee80211_mgmt *mgmt, size_t len) 1430 { 1431 struct ieee80211_sub_if_data *sdata = wk->sdata; 1432 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1433 struct ieee80211_local *local = sdata->local; 1434 struct ieee80211_supported_band *sband; 1435 struct sta_info *sta; 1436 struct cfg80211_bss *cbss = wk->assoc.bss; 1437 u8 *pos; 1438 u32 rates, basic_rates; 1439 u16 capab_info, aid; 1440 struct ieee802_11_elems elems; 1441 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1442 u32 changed = 0; 1443 int i, j, err; 1444 bool have_higher_than_11mbit = false; 1445 u16 ap_ht_cap_flags; 1446 1447 /* AssocResp and ReassocResp have identical structure */ 1448 1449 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1450 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1451 1452 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1453 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1454 "set\n", sdata->name, aid); 1455 aid &= ~(BIT(15) | BIT(14)); 1456 1457 pos = mgmt->u.assoc_resp.variable; 1458 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1459 1460 if (!elems.supp_rates) { 1461 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1462 sdata->name); 1463 return false; 1464 } 1465 1466 ifmgd->aid = aid; 1467 1468 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1469 if (!sta) { 1470 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1471 " the AP\n", sdata->name); 1472 return false; 1473 } 1474 1475 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1476 WLAN_STA_ASSOC_AP); 1477 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1478 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1479 1480 rates = 0; 1481 basic_rates = 0; 1482 sband = local->hw.wiphy->bands[wk->chan->band]; 1483 1484 for (i = 0; i < elems.supp_rates_len; i++) { 1485 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1486 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1487 1488 if (rate > 110) 1489 have_higher_than_11mbit = true; 1490 1491 for (j = 0; j < sband->n_bitrates; j++) { 1492 if (sband->bitrates[j].bitrate == rate) { 1493 rates |= BIT(j); 1494 if (is_basic) 1495 basic_rates |= BIT(j); 1496 break; 1497 } 1498 } 1499 } 1500 1501 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1502 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1503 bool is_basic = !!(elems.ext_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 sta->sta.supp_rates[wk->chan->band] = rates; 1519 sdata->vif.bss_conf.basic_rates = basic_rates; 1520 1521 /* cf. IEEE 802.11 9.2.12 */ 1522 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1523 have_higher_than_11mbit) 1524 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1525 else 1526 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1527 1528 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1529 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1530 elems.ht_cap_elem, &sta->sta.ht_cap); 1531 1532 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1533 1534 rate_control_rate_init(sta); 1535 1536 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1537 set_sta_flags(sta, WLAN_STA_MFP); 1538 1539 if (elems.wmm_param) 1540 set_sta_flags(sta, WLAN_STA_WME); 1541 1542 err = sta_info_insert(sta); 1543 sta = NULL; 1544 if (err) { 1545 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1546 " the AP (error %d)\n", sdata->name, err); 1547 return false; 1548 } 1549 1550 /* 1551 * Always handle WMM once after association regardless 1552 * of the first value the AP uses. Setting -1 here has 1553 * that effect because the AP values is an unsigned 1554 * 4-bit value. 1555 */ 1556 ifmgd->wmm_last_param_set = -1; 1557 1558 if (elems.wmm_param) 1559 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1560 elems.wmm_param_len); 1561 else 1562 ieee80211_set_wmm_default(sdata); 1563 1564 local->oper_channel = wk->chan; 1565 1566 if (elems.ht_info_elem && elems.wmm_param && 1567 (sdata->local->hw.queues >= 4) && 1568 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1569 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1570 cbss->bssid, ap_ht_cap_flags); 1571 1572 /* set AID and assoc capability, 1573 * ieee80211_set_associated() will tell the driver */ 1574 bss_conf->aid = aid; 1575 bss_conf->assoc_capability = capab_info; 1576 ieee80211_set_associated(sdata, cbss, changed); 1577 1578 /* 1579 * If we're using 4-addr mode, let the AP know that we're 1580 * doing so, so that it can create the STA VLAN on its side 1581 */ 1582 if (ifmgd->use_4addr) 1583 ieee80211_send_4addr_nullfunc(local, sdata); 1584 1585 /* 1586 * Start timer to probe the connection to the AP now. 1587 * Also start the timer that will detect beacon loss. 1588 */ 1589 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1590 ieee80211_sta_reset_beacon_monitor(sdata); 1591 1592 return true; 1593 } 1594 1595 1596 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1597 struct ieee80211_mgmt *mgmt, 1598 size_t len, 1599 struct ieee80211_rx_status *rx_status, 1600 struct ieee802_11_elems *elems, 1601 bool beacon) 1602 { 1603 struct ieee80211_local *local = sdata->local; 1604 int freq; 1605 struct ieee80211_bss *bss; 1606 struct ieee80211_channel *channel; 1607 bool need_ps = false; 1608 1609 if (sdata->u.mgd.associated) { 1610 bss = (void *)sdata->u.mgd.associated->priv; 1611 /* not previously set so we may need to recalc */ 1612 need_ps = !bss->dtim_period; 1613 } 1614 1615 if (elems->ds_params && elems->ds_params_len == 1) 1616 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1617 rx_status->band); 1618 else 1619 freq = rx_status->freq; 1620 1621 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1622 1623 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1624 return; 1625 1626 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1627 channel, beacon); 1628 if (bss) 1629 ieee80211_rx_bss_put(local, bss); 1630 1631 if (!sdata->u.mgd.associated) 1632 return; 1633 1634 if (need_ps) { 1635 mutex_lock(&local->iflist_mtx); 1636 ieee80211_recalc_ps(local, -1); 1637 mutex_unlock(&local->iflist_mtx); 1638 } 1639 1640 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1641 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1642 ETH_ALEN) == 0)) { 1643 struct ieee80211_channel_sw_ie *sw_elem = 1644 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1645 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1646 bss, rx_status->mactime); 1647 } 1648 } 1649 1650 1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1652 struct sk_buff *skb) 1653 { 1654 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1655 struct ieee80211_if_managed *ifmgd; 1656 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1657 size_t baselen, len = skb->len; 1658 struct ieee802_11_elems elems; 1659 1660 ifmgd = &sdata->u.mgd; 1661 1662 ASSERT_MGD_MTX(ifmgd); 1663 1664 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1665 return; /* ignore ProbeResp to foreign address */ 1666 1667 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1668 if (baselen > len) 1669 return; 1670 1671 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1672 &elems); 1673 1674 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1675 1676 if (ifmgd->associated && 1677 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1678 ieee80211_reset_ap_probe(sdata); 1679 } 1680 1681 /* 1682 * This is the canonical list of information elements we care about, 1683 * the filter code also gives us all changes to the Microsoft OUI 1684 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1685 * 1686 * We implement beacon filtering in software since that means we can 1687 * avoid processing the frame here and in cfg80211, and userspace 1688 * will not be able to tell whether the hardware supports it or not. 1689 * 1690 * XXX: This list needs to be dynamic -- userspace needs to be able to 1691 * add items it requires. It also needs to be able to tell us to 1692 * look out for other vendor IEs. 1693 */ 1694 static const u64 care_about_ies = 1695 (1ULL << WLAN_EID_COUNTRY) | 1696 (1ULL << WLAN_EID_ERP_INFO) | 1697 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1698 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1699 (1ULL << WLAN_EID_HT_CAPABILITY) | 1700 (1ULL << WLAN_EID_HT_INFORMATION); 1701 1702 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1703 struct ieee80211_mgmt *mgmt, 1704 size_t len, 1705 struct ieee80211_rx_status *rx_status) 1706 { 1707 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1708 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1709 size_t baselen; 1710 struct ieee802_11_elems elems; 1711 struct ieee80211_local *local = sdata->local; 1712 u32 changed = 0; 1713 bool erp_valid, directed_tim = false; 1714 u8 erp_value = 0; 1715 u32 ncrc; 1716 u8 *bssid; 1717 1718 ASSERT_MGD_MTX(ifmgd); 1719 1720 /* Process beacon from the current BSS */ 1721 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1722 if (baselen > len) 1723 return; 1724 1725 if (rx_status->freq != local->hw.conf.channel->center_freq) 1726 return; 1727 1728 /* 1729 * We might have received a number of frames, among them a 1730 * disassoc frame and a beacon... 1731 */ 1732 if (!ifmgd->associated) 1733 return; 1734 1735 bssid = ifmgd->associated->bssid; 1736 1737 /* 1738 * And in theory even frames from a different AP we were just 1739 * associated to a split-second ago! 1740 */ 1741 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1742 return; 1743 1744 /* Track average RSSI from the Beacon frames of the current AP */ 1745 ifmgd->last_beacon_signal = rx_status->signal; 1746 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1747 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1748 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1749 ifmgd->last_cqm_event_signal = 0; 1750 ifmgd->count_beacon_signal = 1; 1751 } else { 1752 ifmgd->ave_beacon_signal = 1753 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1754 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1755 ifmgd->ave_beacon_signal) / 16; 1756 ifmgd->count_beacon_signal++; 1757 } 1758 if (bss_conf->cqm_rssi_thold && 1759 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1760 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1761 int sig = ifmgd->ave_beacon_signal / 16; 1762 int last_event = ifmgd->last_cqm_event_signal; 1763 int thold = bss_conf->cqm_rssi_thold; 1764 int hyst = bss_conf->cqm_rssi_hyst; 1765 if (sig < thold && 1766 (last_event == 0 || sig < last_event - hyst)) { 1767 ifmgd->last_cqm_event_signal = sig; 1768 ieee80211_cqm_rssi_notify( 1769 &sdata->vif, 1770 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1771 GFP_KERNEL); 1772 } else if (sig > thold && 1773 (last_event == 0 || sig > last_event + hyst)) { 1774 ifmgd->last_cqm_event_signal = sig; 1775 ieee80211_cqm_rssi_notify( 1776 &sdata->vif, 1777 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1778 GFP_KERNEL); 1779 } 1780 } 1781 1782 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1783 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1784 if (net_ratelimit()) { 1785 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1786 "to a received beacon\n", sdata->name); 1787 } 1788 #endif 1789 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1790 mutex_lock(&local->iflist_mtx); 1791 ieee80211_recalc_ps(local, -1); 1792 mutex_unlock(&local->iflist_mtx); 1793 } 1794 1795 /* 1796 * Push the beacon loss detection into the future since 1797 * we are processing a beacon from the AP just now. 1798 */ 1799 ieee80211_sta_reset_beacon_monitor(sdata); 1800 1801 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1802 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1803 len - baselen, &elems, 1804 care_about_ies, ncrc); 1805 1806 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1807 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1808 ifmgd->aid); 1809 1810 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1811 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1812 true); 1813 1814 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1815 elems.wmm_param_len); 1816 } 1817 1818 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1819 if (directed_tim) { 1820 if (local->hw.conf.dynamic_ps_timeout > 0) { 1821 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1822 ieee80211_hw_config(local, 1823 IEEE80211_CONF_CHANGE_PS); 1824 ieee80211_send_nullfunc(local, sdata, 0); 1825 } else { 1826 local->pspolling = true; 1827 1828 /* 1829 * Here is assumed that the driver will be 1830 * able to send ps-poll frame and receive a 1831 * response even though power save mode is 1832 * enabled, but some drivers might require 1833 * to disable power save here. This needs 1834 * to be investigated. 1835 */ 1836 ieee80211_send_pspoll(local, sdata); 1837 } 1838 } 1839 } 1840 1841 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1842 return; 1843 ifmgd->beacon_crc = ncrc; 1844 ifmgd->beacon_crc_valid = true; 1845 1846 if (elems.erp_info && elems.erp_info_len >= 1) { 1847 erp_valid = true; 1848 erp_value = elems.erp_info[0]; 1849 } else { 1850 erp_valid = false; 1851 } 1852 changed |= ieee80211_handle_bss_capability(sdata, 1853 le16_to_cpu(mgmt->u.beacon.capab_info), 1854 erp_valid, erp_value); 1855 1856 1857 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1858 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1859 struct sta_info *sta; 1860 struct ieee80211_supported_band *sband; 1861 u16 ap_ht_cap_flags; 1862 1863 rcu_read_lock(); 1864 1865 sta = sta_info_get(sdata, bssid); 1866 if (WARN_ON(!sta)) { 1867 rcu_read_unlock(); 1868 return; 1869 } 1870 1871 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1872 1873 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1874 elems.ht_cap_elem, &sta->sta.ht_cap); 1875 1876 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1877 1878 rcu_read_unlock(); 1879 1880 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1881 bssid, ap_ht_cap_flags); 1882 } 1883 1884 /* Note: country IE parsing is done for us by cfg80211 */ 1885 if (elems.country_elem) { 1886 /* TODO: IBSS also needs this */ 1887 if (elems.pwr_constr_elem) 1888 ieee80211_handle_pwr_constr(sdata, 1889 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1890 elems.pwr_constr_elem, 1891 elems.pwr_constr_elem_len); 1892 } 1893 1894 ieee80211_bss_info_change_notify(sdata, changed); 1895 } 1896 1897 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1898 struct sk_buff *skb) 1899 { 1900 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1901 struct ieee80211_rx_status *rx_status; 1902 struct ieee80211_mgmt *mgmt; 1903 enum rx_mgmt_action rma = RX_MGMT_NONE; 1904 u16 fc; 1905 1906 rx_status = (struct ieee80211_rx_status *) skb->cb; 1907 mgmt = (struct ieee80211_mgmt *) skb->data; 1908 fc = le16_to_cpu(mgmt->frame_control); 1909 1910 mutex_lock(&ifmgd->mtx); 1911 1912 if (ifmgd->associated && 1913 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1914 switch (fc & IEEE80211_FCTL_STYPE) { 1915 case IEEE80211_STYPE_BEACON: 1916 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1917 rx_status); 1918 break; 1919 case IEEE80211_STYPE_PROBE_RESP: 1920 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1921 break; 1922 case IEEE80211_STYPE_DEAUTH: 1923 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1924 break; 1925 case IEEE80211_STYPE_DISASSOC: 1926 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1927 break; 1928 case IEEE80211_STYPE_ACTION: 1929 switch (mgmt->u.action.category) { 1930 case WLAN_CATEGORY_SPECTRUM_MGMT: 1931 ieee80211_sta_process_chanswitch(sdata, 1932 &mgmt->u.action.u.chan_switch.sw_elem, 1933 (void *)ifmgd->associated->priv, 1934 rx_status->mactime); 1935 break; 1936 } 1937 } 1938 mutex_unlock(&ifmgd->mtx); 1939 1940 switch (rma) { 1941 case RX_MGMT_NONE: 1942 /* no action */ 1943 break; 1944 case RX_MGMT_CFG80211_DEAUTH: 1945 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1946 break; 1947 case RX_MGMT_CFG80211_DISASSOC: 1948 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1949 break; 1950 default: 1951 WARN(1, "unexpected: %d", rma); 1952 } 1953 return; 1954 } 1955 1956 mutex_unlock(&ifmgd->mtx); 1957 1958 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1959 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1960 struct ieee80211_local *local = sdata->local; 1961 struct ieee80211_work *wk; 1962 1963 mutex_lock(&local->mtx); 1964 list_for_each_entry(wk, &local->work_list, list) { 1965 if (wk->sdata != sdata) 1966 continue; 1967 1968 if (wk->type != IEEE80211_WORK_ASSOC && 1969 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1970 continue; 1971 1972 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1973 continue; 1974 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1975 continue; 1976 1977 /* 1978 * Printing the message only here means we can't 1979 * spuriously print it, but it also means that it 1980 * won't be printed when the frame comes in before 1981 * we even tried to associate or in similar cases. 1982 * 1983 * Ultimately, I suspect cfg80211 should print the 1984 * messages instead. 1985 */ 1986 printk(KERN_DEBUG 1987 "%s: deauthenticated from %pM (Reason: %u)\n", 1988 sdata->name, mgmt->bssid, 1989 le16_to_cpu(mgmt->u.deauth.reason_code)); 1990 1991 list_del_rcu(&wk->list); 1992 free_work(wk); 1993 break; 1994 } 1995 mutex_unlock(&local->mtx); 1996 1997 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1998 } 1999 } 2000 2001 static void ieee80211_sta_timer(unsigned long data) 2002 { 2003 struct ieee80211_sub_if_data *sdata = 2004 (struct ieee80211_sub_if_data *) data; 2005 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2006 struct ieee80211_local *local = sdata->local; 2007 2008 if (local->quiescing) { 2009 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2010 return; 2011 } 2012 2013 ieee80211_queue_work(&local->hw, &sdata->work); 2014 } 2015 2016 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2017 u8 *bssid) 2018 { 2019 struct ieee80211_local *local = sdata->local; 2020 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2021 2022 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2023 IEEE80211_STA_BEACON_POLL); 2024 2025 ieee80211_set_disassoc(sdata, true, true); 2026 mutex_unlock(&ifmgd->mtx); 2027 mutex_lock(&local->mtx); 2028 ieee80211_recalc_idle(local); 2029 mutex_unlock(&local->mtx); 2030 /* 2031 * must be outside lock due to cfg80211, 2032 * but that's not a problem. 2033 */ 2034 ieee80211_send_deauth_disassoc(sdata, bssid, 2035 IEEE80211_STYPE_DEAUTH, 2036 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2037 NULL, true); 2038 mutex_lock(&ifmgd->mtx); 2039 } 2040 2041 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2042 { 2043 struct ieee80211_local *local = sdata->local; 2044 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2045 2046 /* then process the rest of the work */ 2047 mutex_lock(&ifmgd->mtx); 2048 2049 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2050 IEEE80211_STA_CONNECTION_POLL) && 2051 ifmgd->associated) { 2052 u8 bssid[ETH_ALEN]; 2053 int max_tries; 2054 2055 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2056 2057 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2058 max_tries = max_nullfunc_tries; 2059 else 2060 max_tries = max_probe_tries; 2061 2062 /* ACK received for nullfunc probing frame */ 2063 if (!ifmgd->probe_send_count) 2064 ieee80211_reset_ap_probe(sdata); 2065 else if (ifmgd->nullfunc_failed) { 2066 if (ifmgd->probe_send_count < max_tries) { 2067 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2068 wiphy_debug(local->hw.wiphy, 2069 "%s: No ack for nullfunc frame to" 2070 " AP %pM, try %d/%i\n", 2071 sdata->name, bssid, 2072 ifmgd->probe_send_count, max_tries); 2073 #endif 2074 ieee80211_mgd_probe_ap_send(sdata); 2075 } else { 2076 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2077 wiphy_debug(local->hw.wiphy, 2078 "%s: No ack for nullfunc frame to" 2079 " AP %pM, disconnecting.\n", 2080 sdata->name, bssid); 2081 #endif 2082 ieee80211_sta_connection_lost(sdata, bssid); 2083 } 2084 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2085 run_again(ifmgd, ifmgd->probe_timeout); 2086 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2087 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2088 wiphy_debug(local->hw.wiphy, 2089 "%s: Failed to send nullfunc to AP %pM" 2090 " after %dms, disconnecting.\n", 2091 sdata->name, 2092 bssid, probe_wait_ms); 2093 #endif 2094 ieee80211_sta_connection_lost(sdata, bssid); 2095 } else if (ifmgd->probe_send_count < max_tries) { 2096 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2097 wiphy_debug(local->hw.wiphy, 2098 "%s: No probe response from AP %pM" 2099 " after %dms, try %d/%i\n", 2100 sdata->name, 2101 bssid, probe_wait_ms, 2102 ifmgd->probe_send_count, max_tries); 2103 #endif 2104 ieee80211_mgd_probe_ap_send(sdata); 2105 } else { 2106 /* 2107 * We actually lost the connection ... or did we? 2108 * Let's make sure! 2109 */ 2110 wiphy_debug(local->hw.wiphy, 2111 "%s: No probe response from AP %pM" 2112 " after %dms, disconnecting.\n", 2113 sdata->name, 2114 bssid, probe_wait_ms); 2115 2116 ieee80211_sta_connection_lost(sdata, bssid); 2117 } 2118 } 2119 2120 mutex_unlock(&ifmgd->mtx); 2121 } 2122 2123 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2124 { 2125 struct ieee80211_sub_if_data *sdata = 2126 (struct ieee80211_sub_if_data *) data; 2127 struct ieee80211_local *local = sdata->local; 2128 2129 if (local->quiescing) 2130 return; 2131 2132 ieee80211_queue_work(&sdata->local->hw, 2133 &sdata->u.mgd.beacon_connection_loss_work); 2134 } 2135 2136 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2137 { 2138 struct ieee80211_sub_if_data *sdata = 2139 (struct ieee80211_sub_if_data *) data; 2140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2141 struct ieee80211_local *local = sdata->local; 2142 2143 if (local->quiescing) 2144 return; 2145 2146 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2147 } 2148 2149 static void ieee80211_sta_monitor_work(struct work_struct *work) 2150 { 2151 struct ieee80211_sub_if_data *sdata = 2152 container_of(work, struct ieee80211_sub_if_data, 2153 u.mgd.monitor_work); 2154 2155 ieee80211_mgd_probe_ap(sdata, false); 2156 } 2157 2158 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2159 { 2160 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2161 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2162 IEEE80211_STA_CONNECTION_POLL); 2163 2164 /* let's probe the connection once */ 2165 ieee80211_queue_work(&sdata->local->hw, 2166 &sdata->u.mgd.monitor_work); 2167 /* and do all the other regular work too */ 2168 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2169 } 2170 } 2171 2172 #ifdef CONFIG_PM 2173 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2174 { 2175 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2176 2177 /* 2178 * we need to use atomic bitops for the running bits 2179 * only because both timers might fire at the same 2180 * time -- the code here is properly synchronised. 2181 */ 2182 2183 cancel_work_sync(&ifmgd->request_smps_work); 2184 2185 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2186 if (del_timer_sync(&ifmgd->timer)) 2187 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2188 2189 cancel_work_sync(&ifmgd->chswitch_work); 2190 if (del_timer_sync(&ifmgd->chswitch_timer)) 2191 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2192 2193 cancel_work_sync(&ifmgd->monitor_work); 2194 /* these will just be re-established on connection */ 2195 del_timer_sync(&ifmgd->conn_mon_timer); 2196 del_timer_sync(&ifmgd->bcn_mon_timer); 2197 } 2198 2199 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2200 { 2201 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2202 2203 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2204 add_timer(&ifmgd->timer); 2205 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2206 add_timer(&ifmgd->chswitch_timer); 2207 ieee80211_sta_reset_beacon_monitor(sdata); 2208 ieee80211_restart_sta_timer(sdata); 2209 } 2210 #endif 2211 2212 /* interface setup */ 2213 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2214 { 2215 struct ieee80211_if_managed *ifmgd; 2216 2217 ifmgd = &sdata->u.mgd; 2218 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2219 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2220 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2221 ieee80211_beacon_connection_loss_work); 2222 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2223 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2224 (unsigned long) sdata); 2225 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2226 (unsigned long) sdata); 2227 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2228 (unsigned long) sdata); 2229 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2230 (unsigned long) sdata); 2231 2232 ifmgd->flags = 0; 2233 2234 mutex_init(&ifmgd->mtx); 2235 2236 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2237 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2238 else 2239 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2240 } 2241 2242 /* scan finished notification */ 2243 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2244 { 2245 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2246 2247 /* Restart STA timers */ 2248 rcu_read_lock(); 2249 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2250 ieee80211_restart_sta_timer(sdata); 2251 rcu_read_unlock(); 2252 } 2253 2254 int ieee80211_max_network_latency(struct notifier_block *nb, 2255 unsigned long data, void *dummy) 2256 { 2257 s32 latency_usec = (s32) data; 2258 struct ieee80211_local *local = 2259 container_of(nb, struct ieee80211_local, 2260 network_latency_notifier); 2261 2262 mutex_lock(&local->iflist_mtx); 2263 ieee80211_recalc_ps(local, latency_usec); 2264 mutex_unlock(&local->iflist_mtx); 2265 2266 return 0; 2267 } 2268 2269 /* config hooks */ 2270 static enum work_done_result 2271 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2272 struct sk_buff *skb) 2273 { 2274 if (!skb) { 2275 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2276 return WORK_DONE_DESTROY; 2277 } 2278 2279 if (wk->type == IEEE80211_WORK_AUTH) { 2280 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2281 return WORK_DONE_DESTROY; 2282 } 2283 2284 mutex_lock(&wk->sdata->u.mgd.mtx); 2285 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2286 mutex_unlock(&wk->sdata->u.mgd.mtx); 2287 2288 wk->type = IEEE80211_WORK_AUTH; 2289 wk->probe_auth.tries = 0; 2290 return WORK_DONE_REQUEUE; 2291 } 2292 2293 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2294 struct cfg80211_auth_request *req) 2295 { 2296 const u8 *ssid; 2297 struct ieee80211_work *wk; 2298 u16 auth_alg; 2299 2300 if (req->local_state_change) 2301 return 0; /* no need to update mac80211 state */ 2302 2303 switch (req->auth_type) { 2304 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2305 auth_alg = WLAN_AUTH_OPEN; 2306 break; 2307 case NL80211_AUTHTYPE_SHARED_KEY: 2308 if (IS_ERR(sdata->local->wep_tx_tfm)) 2309 return -EOPNOTSUPP; 2310 auth_alg = WLAN_AUTH_SHARED_KEY; 2311 break; 2312 case NL80211_AUTHTYPE_FT: 2313 auth_alg = WLAN_AUTH_FT; 2314 break; 2315 case NL80211_AUTHTYPE_NETWORK_EAP: 2316 auth_alg = WLAN_AUTH_LEAP; 2317 break; 2318 default: 2319 return -EOPNOTSUPP; 2320 } 2321 2322 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2323 if (!wk) 2324 return -ENOMEM; 2325 2326 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2327 2328 if (req->ie && req->ie_len) { 2329 memcpy(wk->ie, req->ie, req->ie_len); 2330 wk->ie_len = req->ie_len; 2331 } 2332 2333 if (req->key && req->key_len) { 2334 wk->probe_auth.key_len = req->key_len; 2335 wk->probe_auth.key_idx = req->key_idx; 2336 memcpy(wk->probe_auth.key, req->key, req->key_len); 2337 } 2338 2339 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2340 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2341 wk->probe_auth.ssid_len = ssid[1]; 2342 2343 wk->probe_auth.algorithm = auth_alg; 2344 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2345 2346 /* if we already have a probe, don't probe again */ 2347 if (req->bss->proberesp_ies) 2348 wk->type = IEEE80211_WORK_AUTH; 2349 else 2350 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2351 wk->chan = req->bss->channel; 2352 wk->chan_type = NL80211_CHAN_NO_HT; 2353 wk->sdata = sdata; 2354 wk->done = ieee80211_probe_auth_done; 2355 2356 ieee80211_add_work(wk); 2357 return 0; 2358 } 2359 2360 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2361 struct sk_buff *skb) 2362 { 2363 struct ieee80211_mgmt *mgmt; 2364 struct ieee80211_rx_status *rx_status; 2365 struct ieee802_11_elems elems; 2366 u16 status; 2367 2368 if (!skb) { 2369 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2370 return WORK_DONE_DESTROY; 2371 } 2372 2373 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2374 mutex_lock(&wk->sdata->u.mgd.mtx); 2375 rx_status = (void *) skb->cb; 2376 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2377 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2378 &elems, true); 2379 mutex_unlock(&wk->sdata->u.mgd.mtx); 2380 2381 wk->type = IEEE80211_WORK_ASSOC; 2382 /* not really done yet */ 2383 return WORK_DONE_REQUEUE; 2384 } 2385 2386 mgmt = (void *)skb->data; 2387 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2388 2389 if (status == WLAN_STATUS_SUCCESS) { 2390 mutex_lock(&wk->sdata->u.mgd.mtx); 2391 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2392 mutex_unlock(&wk->sdata->u.mgd.mtx); 2393 /* oops -- internal error -- send timeout for now */ 2394 cfg80211_send_assoc_timeout(wk->sdata->dev, 2395 wk->filter_ta); 2396 return WORK_DONE_DESTROY; 2397 } 2398 2399 mutex_unlock(&wk->sdata->u.mgd.mtx); 2400 } 2401 2402 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2403 return WORK_DONE_DESTROY; 2404 } 2405 2406 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2407 struct cfg80211_assoc_request *req) 2408 { 2409 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2410 struct ieee80211_bss *bss = (void *)req->bss->priv; 2411 struct ieee80211_work *wk; 2412 const u8 *ssid; 2413 int i; 2414 2415 mutex_lock(&ifmgd->mtx); 2416 if (ifmgd->associated) { 2417 if (!req->prev_bssid || 2418 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2419 ETH_ALEN)) { 2420 /* 2421 * We are already associated and the request was not a 2422 * reassociation request from the current BSS, so 2423 * reject it. 2424 */ 2425 mutex_unlock(&ifmgd->mtx); 2426 return -EALREADY; 2427 } 2428 2429 /* Trying to reassociate - clear previous association state */ 2430 ieee80211_set_disassoc(sdata, true, false); 2431 } 2432 mutex_unlock(&ifmgd->mtx); 2433 2434 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2435 if (!wk) 2436 return -ENOMEM; 2437 2438 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2439 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2440 2441 ifmgd->beacon_crc_valid = false; 2442 2443 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2444 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2445 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2446 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2447 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2448 2449 2450 if (req->ie && req->ie_len) { 2451 memcpy(wk->ie, req->ie, req->ie_len); 2452 wk->ie_len = req->ie_len; 2453 } else 2454 wk->ie_len = 0; 2455 2456 wk->assoc.bss = req->bss; 2457 2458 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2459 2460 /* new association always uses requested smps mode */ 2461 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2462 if (ifmgd->powersave) 2463 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2464 else 2465 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2466 } else 2467 ifmgd->ap_smps = ifmgd->req_smps; 2468 2469 wk->assoc.smps = ifmgd->ap_smps; 2470 /* 2471 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2472 * We still associate in non-HT mode (11a/b/g) if any one of these 2473 * ciphers is configured as pairwise. 2474 * We can set this to true for non-11n hardware, that'll be checked 2475 * separately along with the peer capabilities. 2476 */ 2477 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2478 wk->assoc.capability = req->bss->capability; 2479 wk->assoc.wmm_used = bss->wmm_used; 2480 wk->assoc.supp_rates = bss->supp_rates; 2481 wk->assoc.supp_rates_len = bss->supp_rates_len; 2482 wk->assoc.ht_information_ie = 2483 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2484 2485 if (bss->wmm_used && bss->uapsd_supported && 2486 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2487 wk->assoc.uapsd_used = true; 2488 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2489 } else { 2490 wk->assoc.uapsd_used = false; 2491 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2492 } 2493 2494 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2495 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2496 wk->assoc.ssid_len = ssid[1]; 2497 2498 if (req->prev_bssid) 2499 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2500 2501 wk->chan = req->bss->channel; 2502 wk->chan_type = NL80211_CHAN_NO_HT; 2503 wk->sdata = sdata; 2504 wk->done = ieee80211_assoc_done; 2505 if (!bss->dtim_period && 2506 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2507 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2508 else 2509 wk->type = IEEE80211_WORK_ASSOC; 2510 2511 if (req->use_mfp) { 2512 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2513 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2514 } else { 2515 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2516 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2517 } 2518 2519 if (req->crypto.control_port) 2520 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2521 else 2522 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2523 2524 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2525 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2526 2527 ieee80211_add_work(wk); 2528 return 0; 2529 } 2530 2531 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2532 struct cfg80211_deauth_request *req, 2533 void *cookie) 2534 { 2535 struct ieee80211_local *local = sdata->local; 2536 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2537 struct ieee80211_work *wk; 2538 u8 bssid[ETH_ALEN]; 2539 bool assoc_bss = false; 2540 2541 mutex_lock(&ifmgd->mtx); 2542 2543 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2544 if (ifmgd->associated == req->bss) { 2545 ieee80211_set_disassoc(sdata, false, true); 2546 mutex_unlock(&ifmgd->mtx); 2547 assoc_bss = true; 2548 } else { 2549 bool not_auth_yet = false; 2550 2551 mutex_unlock(&ifmgd->mtx); 2552 2553 mutex_lock(&local->mtx); 2554 list_for_each_entry(wk, &local->work_list, list) { 2555 if (wk->sdata != sdata) 2556 continue; 2557 2558 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2559 wk->type != IEEE80211_WORK_AUTH && 2560 wk->type != IEEE80211_WORK_ASSOC && 2561 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2562 continue; 2563 2564 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2565 continue; 2566 2567 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2568 list_del_rcu(&wk->list); 2569 free_work(wk); 2570 break; 2571 } 2572 mutex_unlock(&local->mtx); 2573 2574 /* 2575 * If somebody requests authentication and we haven't 2576 * sent out an auth frame yet there's no need to send 2577 * out a deauth frame either. If the state was PROBE, 2578 * then this is the case. If it's AUTH we have sent a 2579 * frame, and if it's IDLE we have completed the auth 2580 * process already. 2581 */ 2582 if (not_auth_yet) { 2583 __cfg80211_auth_canceled(sdata->dev, bssid); 2584 return 0; 2585 } 2586 } 2587 2588 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2589 sdata->name, bssid, req->reason_code); 2590 2591 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2592 req->reason_code, cookie, 2593 !req->local_state_change); 2594 if (assoc_bss) 2595 sta_info_destroy_addr(sdata, bssid); 2596 2597 mutex_lock(&sdata->local->mtx); 2598 ieee80211_recalc_idle(sdata->local); 2599 mutex_unlock(&sdata->local->mtx); 2600 2601 return 0; 2602 } 2603 2604 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2605 struct cfg80211_disassoc_request *req, 2606 void *cookie) 2607 { 2608 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2609 u8 bssid[ETH_ALEN]; 2610 2611 mutex_lock(&ifmgd->mtx); 2612 2613 /* 2614 * cfg80211 should catch this ... but it's racy since 2615 * we can receive a disassoc frame, process it, hand it 2616 * to cfg80211 while that's in a locked section already 2617 * trying to tell us that the user wants to disconnect. 2618 */ 2619 if (ifmgd->associated != req->bss) { 2620 mutex_unlock(&ifmgd->mtx); 2621 return -ENOLINK; 2622 } 2623 2624 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2625 sdata->name, req->bss->bssid, req->reason_code); 2626 2627 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2628 ieee80211_set_disassoc(sdata, false, true); 2629 2630 mutex_unlock(&ifmgd->mtx); 2631 2632 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2633 IEEE80211_STYPE_DISASSOC, req->reason_code, 2634 cookie, !req->local_state_change); 2635 sta_info_destroy_addr(sdata, bssid); 2636 2637 mutex_lock(&sdata->local->mtx); 2638 ieee80211_recalc_idle(sdata->local); 2639 mutex_unlock(&sdata->local->mtx); 2640 2641 return 0; 2642 } 2643 2644 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2645 enum nl80211_cqm_rssi_threshold_event rssi_event, 2646 gfp_t gfp) 2647 { 2648 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2649 2650 trace_api_cqm_rssi_notify(sdata, rssi_event); 2651 2652 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2653 } 2654 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2655