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