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/moduleparam.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/pm_qos.h> 22 #include <linux/crc32.h> 23 #include <linux/slab.h> 24 #include <linux/export.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "led.h" 32 33 static int max_nullfunc_tries = 2; 34 module_param(max_nullfunc_tries, int, 0644); 35 MODULE_PARM_DESC(max_nullfunc_tries, 36 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 37 38 static int max_probe_tries = 5; 39 module_param(max_probe_tries, int, 0644); 40 MODULE_PARM_DESC(max_probe_tries, 41 "Maximum probe tries before disconnecting (reason 4)."); 42 43 /* 44 * Beacon loss timeout is calculated as N frames times the 45 * advertised beacon interval. This may need to be somewhat 46 * higher than what hardware might detect to account for 47 * delays in the host processing frames. But since we also 48 * probe on beacon miss before declaring the connection lost 49 * default to what we want. 50 */ 51 #define IEEE80211_BEACON_LOSS_COUNT 7 52 53 /* 54 * Time the connection can be idle before we probe 55 * it to see if we can still talk to the AP. 56 */ 57 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 58 /* 59 * Time we wait for a probe response after sending 60 * a probe request because of beacon loss or for 61 * checking the connection still works. 62 */ 63 static int probe_wait_ms = 500; 64 module_param(probe_wait_ms, int, 0644); 65 MODULE_PARM_DESC(probe_wait_ms, 66 "Maximum time(ms) to wait for probe response" 67 " before disconnecting (reason 4)."); 68 69 /* 70 * Weight given to the latest Beacon frame when calculating average signal 71 * strength for Beacon frames received in the current BSS. This must be 72 * between 1 and 15. 73 */ 74 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 75 76 /* 77 * How many Beacon frames need to have been used in average signal strength 78 * before starting to indicate signal change events. 79 */ 80 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 81 82 #define TMR_RUNNING_TIMER 0 83 #define TMR_RUNNING_CHANSW 1 84 85 /* 86 * All cfg80211 functions have to be called outside a locked 87 * section so that they can acquire a lock themselves... This 88 * is much simpler than queuing up things in cfg80211, but we 89 * do need some indirection for that here. 90 */ 91 enum rx_mgmt_action { 92 /* no action required */ 93 RX_MGMT_NONE, 94 95 /* caller must call cfg80211_send_deauth() */ 96 RX_MGMT_CFG80211_DEAUTH, 97 98 /* caller must call cfg80211_send_disassoc() */ 99 RX_MGMT_CFG80211_DISASSOC, 100 }; 101 102 /* utils */ 103 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 104 { 105 lockdep_assert_held(&ifmgd->mtx); 106 } 107 108 /* 109 * We can have multiple work items (and connection probing) 110 * scheduling this timer, but we need to take care to only 111 * reschedule it when it should fire _earlier_ than it was 112 * asked for before, or if it's not pending right now. This 113 * function ensures that. Note that it then is required to 114 * run this function for all timeouts after the first one 115 * has happened -- the work that runs from this timer will 116 * do that. 117 */ 118 static void run_again(struct ieee80211_if_managed *ifmgd, 119 unsigned long timeout) 120 { 121 ASSERT_MGD_MTX(ifmgd); 122 123 if (!timer_pending(&ifmgd->timer) || 124 time_before(timeout, ifmgd->timer.expires)) 125 mod_timer(&ifmgd->timer, timeout); 126 } 127 128 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 129 { 130 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 131 return; 132 133 mod_timer(&sdata->u.mgd.bcn_mon_timer, 134 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 135 } 136 137 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 138 { 139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 140 141 if (unlikely(!sdata->u.mgd.associated)) 142 return; 143 144 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 145 return; 146 147 mod_timer(&sdata->u.mgd.conn_mon_timer, 148 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 149 150 ifmgd->probe_send_count = 0; 151 } 152 153 static int ecw2cw(int ecw) 154 { 155 return (1 << ecw) - 1; 156 } 157 158 /* 159 * ieee80211_enable_ht should be called only after the operating band 160 * has been determined as ht configuration depends on the hw's 161 * HT abilities for a specific band. 162 */ 163 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 164 struct ieee80211_ht_info *hti, 165 const u8 *bssid, u16 ap_ht_cap_flags, 166 bool beacon_htcap_ie) 167 { 168 struct ieee80211_local *local = sdata->local; 169 struct ieee80211_supported_band *sband; 170 struct sta_info *sta; 171 u32 changed = 0; 172 int hti_cfreq; 173 u16 ht_opmode; 174 bool enable_ht = true; 175 enum nl80211_channel_type prev_chantype; 176 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 177 178 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 179 180 prev_chantype = sdata->vif.bss_conf.channel_type; 181 182 /* HT is not supported */ 183 if (!sband->ht_cap.ht_supported) 184 enable_ht = false; 185 186 if (enable_ht) { 187 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan, 188 sband->band); 189 /* check that channel matches the right operating channel */ 190 if (local->hw.conf.channel->center_freq != hti_cfreq) { 191 /* Some APs mess this up, evidently. 192 * Netgear WNDR3700 sometimes reports 4 higher than 193 * the actual channel, for instance. 194 */ 195 printk(KERN_DEBUG 196 "%s: Wrong control channel in association" 197 " response: configured center-freq: %d" 198 " hti-cfreq: %d hti->control_chan: %d" 199 " band: %d. Disabling HT.\n", 200 sdata->name, 201 local->hw.conf.channel->center_freq, 202 hti_cfreq, hti->control_chan, 203 sband->band); 204 enable_ht = false; 205 } 206 } 207 208 if (enable_ht) { 209 channel_type = NL80211_CHAN_HT20; 210 211 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 212 !ieee80111_cfg_override_disables_ht40(sdata) && 213 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 214 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 215 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 216 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 217 if (!(local->hw.conf.channel->flags & 218 IEEE80211_CHAN_NO_HT40PLUS)) 219 channel_type = NL80211_CHAN_HT40PLUS; 220 break; 221 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 222 if (!(local->hw.conf.channel->flags & 223 IEEE80211_CHAN_NO_HT40MINUS)) 224 channel_type = NL80211_CHAN_HT40MINUS; 225 break; 226 } 227 } 228 } 229 230 if (local->tmp_channel) 231 local->tmp_channel_type = channel_type; 232 233 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 234 /* can only fail due to HT40+/- mismatch */ 235 channel_type = NL80211_CHAN_HT20; 236 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 237 } 238 239 if (beacon_htcap_ie && (prev_chantype != channel_type)) { 240 /* 241 * Whenever the AP announces the HT mode change that can be 242 * 40MHz intolerant or etc., it would be safer to stop tx 243 * queues before doing hw config to avoid buffer overflow. 244 */ 245 ieee80211_stop_queues_by_reason(&sdata->local->hw, 246 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 247 248 /* flush out all packets */ 249 synchronize_net(); 250 251 drv_flush(local, false); 252 } 253 254 /* channel_type change automatically detected */ 255 ieee80211_hw_config(local, 0); 256 257 if (prev_chantype != channel_type) { 258 rcu_read_lock(); 259 sta = sta_info_get(sdata, bssid); 260 if (sta) 261 rate_control_rate_update(local, sband, sta, 262 IEEE80211_RC_HT_CHANGED, 263 channel_type); 264 rcu_read_unlock(); 265 266 if (beacon_htcap_ie) 267 ieee80211_wake_queues_by_reason(&sdata->local->hw, 268 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 269 } 270 271 ht_opmode = le16_to_cpu(hti->operation_mode); 272 273 /* if bss configuration changed store the new one */ 274 if (sdata->ht_opmode_valid != enable_ht || 275 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 276 prev_chantype != channel_type) { 277 changed |= BSS_CHANGED_HT; 278 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 279 sdata->ht_opmode_valid = enable_ht; 280 } 281 282 return changed; 283 } 284 285 /* frame sending functions */ 286 287 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 288 const u8 *bssid, u16 stype, u16 reason, 289 void *cookie, bool send_frame) 290 { 291 struct ieee80211_local *local = sdata->local; 292 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 293 struct sk_buff *skb; 294 struct ieee80211_mgmt *mgmt; 295 296 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 297 if (!skb) 298 return; 299 300 skb_reserve(skb, local->hw.extra_tx_headroom); 301 302 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 303 memset(mgmt, 0, 24); 304 memcpy(mgmt->da, bssid, ETH_ALEN); 305 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 306 memcpy(mgmt->bssid, bssid, ETH_ALEN); 307 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 308 skb_put(skb, 2); 309 /* u.deauth.reason_code == u.disassoc.reason_code */ 310 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 311 312 if (stype == IEEE80211_STYPE_DEAUTH) 313 if (cookie) 314 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 315 else 316 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 317 else 318 if (cookie) 319 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 320 else 321 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 322 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 323 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 324 325 if (send_frame) 326 ieee80211_tx_skb(sdata, skb); 327 else 328 kfree_skb(skb); 329 } 330 331 void ieee80211_send_pspoll(struct ieee80211_local *local, 332 struct ieee80211_sub_if_data *sdata) 333 { 334 struct ieee80211_pspoll *pspoll; 335 struct sk_buff *skb; 336 337 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 338 if (!skb) 339 return; 340 341 pspoll = (struct ieee80211_pspoll *) skb->data; 342 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 343 344 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 345 ieee80211_tx_skb(sdata, skb); 346 } 347 348 void ieee80211_send_nullfunc(struct ieee80211_local *local, 349 struct ieee80211_sub_if_data *sdata, 350 int powersave) 351 { 352 struct sk_buff *skb; 353 struct ieee80211_hdr_3addr *nullfunc; 354 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 355 356 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 357 if (!skb) 358 return; 359 360 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 361 if (powersave) 362 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 363 364 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 365 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 366 IEEE80211_STA_CONNECTION_POLL)) 367 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 368 369 ieee80211_tx_skb(sdata, skb); 370 } 371 372 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 373 struct ieee80211_sub_if_data *sdata) 374 { 375 struct sk_buff *skb; 376 struct ieee80211_hdr *nullfunc; 377 __le16 fc; 378 379 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 380 return; 381 382 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 383 if (!skb) 384 return; 385 386 skb_reserve(skb, local->hw.extra_tx_headroom); 387 388 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 389 memset(nullfunc, 0, 30); 390 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 391 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 392 nullfunc->frame_control = fc; 393 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 394 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 395 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 396 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 397 398 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 399 ieee80211_tx_skb(sdata, skb); 400 } 401 402 /* spectrum management related things */ 403 static void ieee80211_chswitch_work(struct work_struct *work) 404 { 405 struct ieee80211_sub_if_data *sdata = 406 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 407 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 408 409 if (!ieee80211_sdata_running(sdata)) 410 return; 411 412 mutex_lock(&ifmgd->mtx); 413 if (!ifmgd->associated) 414 goto out; 415 416 sdata->local->oper_channel = sdata->local->csa_channel; 417 if (!sdata->local->ops->channel_switch) { 418 /* call "hw_config" only if doing sw channel switch */ 419 ieee80211_hw_config(sdata->local, 420 IEEE80211_CONF_CHANGE_CHANNEL); 421 } else { 422 /* update the device channel directly */ 423 sdata->local->hw.conf.channel = sdata->local->oper_channel; 424 } 425 426 /* XXX: shouldn't really modify cfg80211-owned data! */ 427 ifmgd->associated->channel = sdata->local->oper_channel; 428 429 ieee80211_wake_queues_by_reason(&sdata->local->hw, 430 IEEE80211_QUEUE_STOP_REASON_CSA); 431 out: 432 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 433 mutex_unlock(&ifmgd->mtx); 434 } 435 436 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 437 { 438 struct ieee80211_sub_if_data *sdata; 439 struct ieee80211_if_managed *ifmgd; 440 441 sdata = vif_to_sdata(vif); 442 ifmgd = &sdata->u.mgd; 443 444 trace_api_chswitch_done(sdata, success); 445 if (!success) { 446 /* 447 * If the channel switch was not successful, stay 448 * around on the old channel. We currently lack 449 * good handling of this situation, possibly we 450 * should just drop the association. 451 */ 452 sdata->local->csa_channel = sdata->local->oper_channel; 453 } 454 455 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 456 } 457 EXPORT_SYMBOL(ieee80211_chswitch_done); 458 459 static void ieee80211_chswitch_timer(unsigned long data) 460 { 461 struct ieee80211_sub_if_data *sdata = 462 (struct ieee80211_sub_if_data *) data; 463 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 464 465 if (sdata->local->quiescing) { 466 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 467 return; 468 } 469 470 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 471 } 472 473 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 474 struct ieee80211_channel_sw_ie *sw_elem, 475 struct ieee80211_bss *bss, 476 u64 timestamp) 477 { 478 struct cfg80211_bss *cbss = 479 container_of((void *)bss, struct cfg80211_bss, priv); 480 struct ieee80211_channel *new_ch; 481 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 482 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 483 cbss->channel->band); 484 485 ASSERT_MGD_MTX(ifmgd); 486 487 if (!ifmgd->associated) 488 return; 489 490 if (sdata->local->scanning) 491 return; 492 493 /* Disregard subsequent beacons if we are already running a timer 494 processing a CSA */ 495 496 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 497 return; 498 499 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 500 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 501 return; 502 503 sdata->local->csa_channel = new_ch; 504 505 if (sdata->local->ops->channel_switch) { 506 /* use driver's channel switch callback */ 507 struct ieee80211_channel_switch ch_switch; 508 memset(&ch_switch, 0, sizeof(ch_switch)); 509 ch_switch.timestamp = timestamp; 510 if (sw_elem->mode) { 511 ch_switch.block_tx = true; 512 ieee80211_stop_queues_by_reason(&sdata->local->hw, 513 IEEE80211_QUEUE_STOP_REASON_CSA); 514 } 515 ch_switch.channel = new_ch; 516 ch_switch.count = sw_elem->count; 517 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 518 drv_channel_switch(sdata->local, &ch_switch); 519 return; 520 } 521 522 /* channel switch handled in software */ 523 if (sw_elem->count <= 1) { 524 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 525 } else { 526 if (sw_elem->mode) 527 ieee80211_stop_queues_by_reason(&sdata->local->hw, 528 IEEE80211_QUEUE_STOP_REASON_CSA); 529 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 530 mod_timer(&ifmgd->chswitch_timer, 531 jiffies + 532 msecs_to_jiffies(sw_elem->count * 533 cbss->beacon_interval)); 534 } 535 } 536 537 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 538 u16 capab_info, u8 *pwr_constr_elem, 539 u8 pwr_constr_elem_len) 540 { 541 struct ieee80211_conf *conf = &sdata->local->hw.conf; 542 543 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 544 return; 545 546 /* Power constraint IE length should be 1 octet */ 547 if (pwr_constr_elem_len != 1) 548 return; 549 550 if ((*pwr_constr_elem <= conf->channel->max_power) && 551 (*pwr_constr_elem != sdata->local->power_constr_level)) { 552 sdata->local->power_constr_level = *pwr_constr_elem; 553 ieee80211_hw_config(sdata->local, 0); 554 } 555 } 556 557 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 558 { 559 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 560 struct ieee80211_local *local = sdata->local; 561 struct ieee80211_conf *conf = &local->hw.conf; 562 563 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 564 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 565 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 566 567 local->disable_dynamic_ps = false; 568 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 569 } 570 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 571 572 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 573 { 574 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 575 struct ieee80211_local *local = sdata->local; 576 struct ieee80211_conf *conf = &local->hw.conf; 577 578 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 579 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 580 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 581 582 local->disable_dynamic_ps = true; 583 conf->dynamic_ps_timeout = 0; 584 del_timer_sync(&local->dynamic_ps_timer); 585 ieee80211_queue_work(&local->hw, 586 &local->dynamic_ps_enable_work); 587 } 588 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 589 590 /* powersave */ 591 static void ieee80211_enable_ps(struct ieee80211_local *local, 592 struct ieee80211_sub_if_data *sdata) 593 { 594 struct ieee80211_conf *conf = &local->hw.conf; 595 596 /* 597 * If we are scanning right now then the parameters will 598 * take effect when scan finishes. 599 */ 600 if (local->scanning) 601 return; 602 603 if (conf->dynamic_ps_timeout > 0 && 604 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 605 mod_timer(&local->dynamic_ps_timer, jiffies + 606 msecs_to_jiffies(conf->dynamic_ps_timeout)); 607 } else { 608 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 609 ieee80211_send_nullfunc(local, sdata, 1); 610 611 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 612 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 613 return; 614 615 conf->flags |= IEEE80211_CONF_PS; 616 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 617 } 618 } 619 620 static void ieee80211_change_ps(struct ieee80211_local *local) 621 { 622 struct ieee80211_conf *conf = &local->hw.conf; 623 624 if (local->ps_sdata) { 625 ieee80211_enable_ps(local, local->ps_sdata); 626 } else if (conf->flags & IEEE80211_CONF_PS) { 627 conf->flags &= ~IEEE80211_CONF_PS; 628 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 629 del_timer_sync(&local->dynamic_ps_timer); 630 cancel_work_sync(&local->dynamic_ps_enable_work); 631 } 632 } 633 634 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 635 { 636 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 637 struct sta_info *sta = NULL; 638 bool authorized = false; 639 640 if (!mgd->powersave) 641 return false; 642 643 if (mgd->broken_ap) 644 return false; 645 646 if (!mgd->associated) 647 return false; 648 649 if (!mgd->associated->beacon_ies) 650 return false; 651 652 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 653 IEEE80211_STA_CONNECTION_POLL)) 654 return false; 655 656 rcu_read_lock(); 657 sta = sta_info_get(sdata, mgd->bssid); 658 if (sta) 659 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 660 rcu_read_unlock(); 661 662 return authorized; 663 } 664 665 /* need to hold RTNL or interface lock */ 666 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 667 { 668 struct ieee80211_sub_if_data *sdata, *found = NULL; 669 int count = 0; 670 int timeout; 671 672 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 673 local->ps_sdata = NULL; 674 return; 675 } 676 677 if (!list_empty(&local->work_list)) { 678 local->ps_sdata = NULL; 679 goto change; 680 } 681 682 list_for_each_entry(sdata, &local->interfaces, list) { 683 if (!ieee80211_sdata_running(sdata)) 684 continue; 685 if (sdata->vif.type == NL80211_IFTYPE_AP) { 686 /* If an AP vif is found, then disable PS 687 * by setting the count to zero thereby setting 688 * ps_sdata to NULL. 689 */ 690 count = 0; 691 break; 692 } 693 if (sdata->vif.type != NL80211_IFTYPE_STATION) 694 continue; 695 found = sdata; 696 count++; 697 } 698 699 if (count == 1 && ieee80211_powersave_allowed(found)) { 700 struct ieee80211_conf *conf = &local->hw.conf; 701 s32 beaconint_us; 702 703 if (latency < 0) 704 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 705 706 beaconint_us = ieee80211_tu_to_usec( 707 found->vif.bss_conf.beacon_int); 708 709 timeout = local->dynamic_ps_forced_timeout; 710 if (timeout < 0) { 711 /* 712 * Go to full PSM if the user configures a very low 713 * latency requirement. 714 * The 2000 second value is there for compatibility 715 * until the PM_QOS_NETWORK_LATENCY is configured 716 * with real values. 717 */ 718 if (latency > (1900 * USEC_PER_MSEC) && 719 latency != (2000 * USEC_PER_SEC)) 720 timeout = 0; 721 else 722 timeout = 100; 723 } 724 local->dynamic_ps_user_timeout = timeout; 725 if (!local->disable_dynamic_ps) 726 conf->dynamic_ps_timeout = 727 local->dynamic_ps_user_timeout; 728 729 if (beaconint_us > latency) { 730 local->ps_sdata = NULL; 731 } else { 732 struct ieee80211_bss *bss; 733 int maxslp = 1; 734 u8 dtimper; 735 736 bss = (void *)found->u.mgd.associated->priv; 737 dtimper = bss->dtim_period; 738 739 /* If the TIM IE is invalid, pretend the value is 1 */ 740 if (!dtimper) 741 dtimper = 1; 742 else if (dtimper > 1) 743 maxslp = min_t(int, dtimper, 744 latency / beaconint_us); 745 746 local->hw.conf.max_sleep_period = maxslp; 747 local->hw.conf.ps_dtim_period = dtimper; 748 local->ps_sdata = found; 749 } 750 } else { 751 local->ps_sdata = NULL; 752 } 753 754 change: 755 ieee80211_change_ps(local); 756 } 757 758 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 759 { 760 struct ieee80211_local *local = 761 container_of(work, struct ieee80211_local, 762 dynamic_ps_disable_work); 763 764 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 765 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 766 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 767 } 768 769 ieee80211_wake_queues_by_reason(&local->hw, 770 IEEE80211_QUEUE_STOP_REASON_PS); 771 } 772 773 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 774 { 775 struct ieee80211_local *local = 776 container_of(work, struct ieee80211_local, 777 dynamic_ps_enable_work); 778 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 779 struct ieee80211_if_managed *ifmgd; 780 unsigned long flags; 781 int q; 782 783 /* can only happen when PS was just disabled anyway */ 784 if (!sdata) 785 return; 786 787 ifmgd = &sdata->u.mgd; 788 789 if (local->hw.conf.flags & IEEE80211_CONF_PS) 790 return; 791 792 if (!local->disable_dynamic_ps && 793 local->hw.conf.dynamic_ps_timeout > 0) { 794 /* don't enter PS if TX frames are pending */ 795 if (drv_tx_frames_pending(local)) { 796 mod_timer(&local->dynamic_ps_timer, jiffies + 797 msecs_to_jiffies( 798 local->hw.conf.dynamic_ps_timeout)); 799 return; 800 } 801 802 /* 803 * transmission can be stopped by others which leads to 804 * dynamic_ps_timer expiry. Postpone the ps timer if it 805 * is not the actual idle state. 806 */ 807 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 808 for (q = 0; q < local->hw.queues; q++) { 809 if (local->queue_stop_reasons[q]) { 810 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 811 flags); 812 mod_timer(&local->dynamic_ps_timer, jiffies + 813 msecs_to_jiffies( 814 local->hw.conf.dynamic_ps_timeout)); 815 return; 816 } 817 } 818 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 819 } 820 821 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 822 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 823 netif_tx_stop_all_queues(sdata->dev); 824 825 if (drv_tx_frames_pending(local)) 826 mod_timer(&local->dynamic_ps_timer, jiffies + 827 msecs_to_jiffies( 828 local->hw.conf.dynamic_ps_timeout)); 829 else { 830 ieee80211_send_nullfunc(local, sdata, 1); 831 /* Flush to get the tx status of nullfunc frame */ 832 drv_flush(local, false); 833 } 834 } 835 836 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 837 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 838 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 839 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 840 local->hw.conf.flags |= IEEE80211_CONF_PS; 841 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 842 } 843 844 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 845 netif_tx_wake_all_queues(sdata->dev); 846 } 847 848 void ieee80211_dynamic_ps_timer(unsigned long data) 849 { 850 struct ieee80211_local *local = (void *) data; 851 852 if (local->quiescing || local->suspended) 853 return; 854 855 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 856 } 857 858 /* MLME */ 859 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 860 struct ieee80211_sub_if_data *sdata, 861 u8 *wmm_param, size_t wmm_param_len) 862 { 863 struct ieee80211_tx_queue_params params; 864 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 865 size_t left; 866 int count; 867 u8 *pos, uapsd_queues = 0; 868 869 if (!local->ops->conf_tx) 870 return; 871 872 if (local->hw.queues < 4) 873 return; 874 875 if (!wmm_param) 876 return; 877 878 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 879 return; 880 881 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 882 uapsd_queues = local->uapsd_queues; 883 884 count = wmm_param[6] & 0x0f; 885 if (count == ifmgd->wmm_last_param_set) 886 return; 887 ifmgd->wmm_last_param_set = count; 888 889 pos = wmm_param + 8; 890 left = wmm_param_len - 8; 891 892 memset(¶ms, 0, sizeof(params)); 893 894 local->wmm_acm = 0; 895 for (; left >= 4; left -= 4, pos += 4) { 896 int aci = (pos[0] >> 5) & 0x03; 897 int acm = (pos[0] >> 4) & 0x01; 898 bool uapsd = false; 899 int queue; 900 901 switch (aci) { 902 case 1: /* AC_BK */ 903 queue = 3; 904 if (acm) 905 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 906 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 907 uapsd = true; 908 break; 909 case 2: /* AC_VI */ 910 queue = 1; 911 if (acm) 912 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 913 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 914 uapsd = true; 915 break; 916 case 3: /* AC_VO */ 917 queue = 0; 918 if (acm) 919 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 920 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 921 uapsd = true; 922 break; 923 case 0: /* AC_BE */ 924 default: 925 queue = 2; 926 if (acm) 927 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 928 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 929 uapsd = true; 930 break; 931 } 932 933 params.aifs = pos[0] & 0x0f; 934 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 935 params.cw_min = ecw2cw(pos[1] & 0x0f); 936 params.txop = get_unaligned_le16(pos + 2); 937 params.uapsd = uapsd; 938 939 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 940 wiphy_debug(local->hw.wiphy, 941 "WMM queue=%d aci=%d acm=%d aifs=%d " 942 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 943 queue, aci, acm, 944 params.aifs, params.cw_min, params.cw_max, 945 params.txop, params.uapsd); 946 #endif 947 sdata->tx_conf[queue] = params; 948 if (drv_conf_tx(local, sdata, queue, ¶ms)) 949 wiphy_debug(local->hw.wiphy, 950 "failed to set TX queue parameters for queue %d\n", 951 queue); 952 } 953 954 /* enable WMM or activate new settings */ 955 sdata->vif.bss_conf.qos = true; 956 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 957 } 958 959 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 960 u16 capab, bool erp_valid, u8 erp) 961 { 962 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 963 u32 changed = 0; 964 bool use_protection; 965 bool use_short_preamble; 966 bool use_short_slot; 967 968 if (erp_valid) { 969 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 970 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 971 } else { 972 use_protection = false; 973 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 974 } 975 976 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 977 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 978 use_short_slot = true; 979 980 if (use_protection != bss_conf->use_cts_prot) { 981 bss_conf->use_cts_prot = use_protection; 982 changed |= BSS_CHANGED_ERP_CTS_PROT; 983 } 984 985 if (use_short_preamble != bss_conf->use_short_preamble) { 986 bss_conf->use_short_preamble = use_short_preamble; 987 changed |= BSS_CHANGED_ERP_PREAMBLE; 988 } 989 990 if (use_short_slot != bss_conf->use_short_slot) { 991 bss_conf->use_short_slot = use_short_slot; 992 changed |= BSS_CHANGED_ERP_SLOT; 993 } 994 995 return changed; 996 } 997 998 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 999 struct cfg80211_bss *cbss, 1000 u32 bss_info_changed) 1001 { 1002 struct ieee80211_bss *bss = (void *)cbss->priv; 1003 struct ieee80211_local *local = sdata->local; 1004 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1005 1006 bss_info_changed |= BSS_CHANGED_ASSOC; 1007 /* set timing information */ 1008 bss_conf->beacon_int = cbss->beacon_interval; 1009 bss_conf->timestamp = cbss->tsf; 1010 1011 bss_info_changed |= BSS_CHANGED_BEACON_INT; 1012 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1013 cbss->capability, bss->has_erp_value, bss->erp_value); 1014 1015 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1016 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1017 1018 sdata->u.mgd.associated = cbss; 1019 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1020 1021 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1022 1023 /* just to be sure */ 1024 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1025 IEEE80211_STA_BEACON_POLL); 1026 1027 ieee80211_led_assoc(local, 1); 1028 1029 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1030 bss_conf->dtim_period = bss->dtim_period; 1031 else 1032 bss_conf->dtim_period = 0; 1033 1034 bss_conf->assoc = 1; 1035 /* 1036 * For now just always ask the driver to update the basic rateset 1037 * when we have associated, we aren't checking whether it actually 1038 * changed or not. 1039 */ 1040 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1041 1042 /* And the BSSID changed - we're associated now */ 1043 bss_info_changed |= BSS_CHANGED_BSSID; 1044 1045 /* Tell the driver to monitor connection quality (if supported) */ 1046 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1047 bss_conf->cqm_rssi_thold) 1048 bss_info_changed |= BSS_CHANGED_CQM; 1049 1050 /* Enable ARP filtering */ 1051 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1052 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1053 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1054 } 1055 1056 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1057 1058 mutex_lock(&local->iflist_mtx); 1059 ieee80211_recalc_ps(local, -1); 1060 ieee80211_recalc_smps(local); 1061 mutex_unlock(&local->iflist_mtx); 1062 1063 netif_tx_start_all_queues(sdata->dev); 1064 netif_carrier_on(sdata->dev); 1065 } 1066 1067 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1068 bool remove_sta, bool tx) 1069 { 1070 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1071 struct ieee80211_local *local = sdata->local; 1072 struct sta_info *sta; 1073 u32 changed = 0, config_changed = 0; 1074 u8 bssid[ETH_ALEN]; 1075 1076 ASSERT_MGD_MTX(ifmgd); 1077 1078 if (WARN_ON(!ifmgd->associated)) 1079 return; 1080 1081 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1082 1083 ifmgd->associated = NULL; 1084 memset(ifmgd->bssid, 0, ETH_ALEN); 1085 1086 /* 1087 * we need to commit the associated = NULL change because the 1088 * scan code uses that to determine whether this iface should 1089 * go to/wake up from powersave or not -- and could otherwise 1090 * wake the queues erroneously. 1091 */ 1092 smp_mb(); 1093 1094 /* 1095 * Thus, we can only afterwards stop the queues -- to account 1096 * for the case where another CPU is finishing a scan at this 1097 * time -- we don't want the scan code to enable queues. 1098 */ 1099 1100 netif_tx_stop_all_queues(sdata->dev); 1101 netif_carrier_off(sdata->dev); 1102 1103 mutex_lock(&local->sta_mtx); 1104 sta = sta_info_get(sdata, bssid); 1105 if (sta) { 1106 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 1107 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1108 } 1109 mutex_unlock(&local->sta_mtx); 1110 1111 changed |= ieee80211_reset_erp_info(sdata); 1112 1113 ieee80211_led_assoc(local, 0); 1114 changed |= BSS_CHANGED_ASSOC; 1115 sdata->vif.bss_conf.assoc = false; 1116 1117 ieee80211_set_wmm_default(sdata); 1118 1119 /* channel(_type) changes are handled by ieee80211_hw_config */ 1120 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1121 1122 /* on the next assoc, re-program HT parameters */ 1123 sdata->ht_opmode_valid = false; 1124 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 1125 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 1126 1127 local->power_constr_level = 0; 1128 1129 del_timer_sync(&local->dynamic_ps_timer); 1130 cancel_work_sync(&local->dynamic_ps_enable_work); 1131 1132 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1133 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1134 config_changed |= IEEE80211_CONF_CHANGE_PS; 1135 } 1136 local->ps_sdata = NULL; 1137 1138 ieee80211_hw_config(local, config_changed); 1139 1140 /* Disable ARP filtering */ 1141 if (sdata->vif.bss_conf.arp_filter_enabled) { 1142 sdata->vif.bss_conf.arp_filter_enabled = false; 1143 changed |= BSS_CHANGED_ARP_FILTER; 1144 } 1145 1146 /* The BSSID (not really interesting) and HT changed */ 1147 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1148 ieee80211_bss_info_change_notify(sdata, changed); 1149 1150 /* remove AP and TDLS peers */ 1151 if (remove_sta) 1152 sta_info_flush(local, sdata); 1153 1154 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1155 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1156 del_timer_sync(&sdata->u.mgd.timer); 1157 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1158 } 1159 1160 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1161 struct ieee80211_hdr *hdr) 1162 { 1163 /* 1164 * We can postpone the mgd.timer whenever receiving unicast frames 1165 * from AP because we know that the connection is working both ways 1166 * at that time. But multicast frames (and hence also beacons) must 1167 * be ignored here, because we need to trigger the timer during 1168 * data idle periods for sending the periodic probe request to the 1169 * AP we're connected to. 1170 */ 1171 if (is_multicast_ether_addr(hdr->addr1)) 1172 return; 1173 1174 ieee80211_sta_reset_conn_monitor(sdata); 1175 } 1176 1177 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1178 { 1179 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1180 1181 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1182 IEEE80211_STA_CONNECTION_POLL))) 1183 return; 1184 1185 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1186 IEEE80211_STA_BEACON_POLL); 1187 mutex_lock(&sdata->local->iflist_mtx); 1188 ieee80211_recalc_ps(sdata->local, -1); 1189 mutex_unlock(&sdata->local->iflist_mtx); 1190 1191 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1192 return; 1193 1194 /* 1195 * We've received a probe response, but are not sure whether 1196 * we have or will be receiving any beacons or data, so let's 1197 * schedule the timers again, just in case. 1198 */ 1199 ieee80211_sta_reset_beacon_monitor(sdata); 1200 1201 mod_timer(&ifmgd->conn_mon_timer, 1202 round_jiffies_up(jiffies + 1203 IEEE80211_CONNECTION_IDLE_TIME)); 1204 } 1205 1206 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1207 struct ieee80211_hdr *hdr, bool ack) 1208 { 1209 if (!ieee80211_is_data(hdr->frame_control)) 1210 return; 1211 1212 if (ack) 1213 ieee80211_sta_reset_conn_monitor(sdata); 1214 1215 if (ieee80211_is_nullfunc(hdr->frame_control) && 1216 sdata->u.mgd.probe_send_count > 0) { 1217 if (ack) 1218 sdata->u.mgd.probe_send_count = 0; 1219 else 1220 sdata->u.mgd.nullfunc_failed = true; 1221 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1222 } 1223 } 1224 1225 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1226 { 1227 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1228 const u8 *ssid; 1229 u8 *dst = ifmgd->associated->bssid; 1230 u8 unicast_limit = max(1, max_probe_tries - 3); 1231 1232 /* 1233 * Try sending broadcast probe requests for the last three 1234 * probe requests after the first ones failed since some 1235 * buggy APs only support broadcast probe requests. 1236 */ 1237 if (ifmgd->probe_send_count >= unicast_limit) 1238 dst = NULL; 1239 1240 /* 1241 * When the hardware reports an accurate Tx ACK status, it's 1242 * better to send a nullfunc frame instead of a probe request, 1243 * as it will kick us off the AP quickly if we aren't associated 1244 * anymore. The timeout will be reset if the frame is ACKed by 1245 * the AP. 1246 */ 1247 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1248 ifmgd->nullfunc_failed = false; 1249 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1250 } else { 1251 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1252 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0, 1253 (u32) -1, true, false); 1254 } 1255 1256 ifmgd->probe_send_count++; 1257 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1258 run_again(ifmgd, ifmgd->probe_timeout); 1259 } 1260 1261 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1262 bool beacon) 1263 { 1264 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1265 bool already = false; 1266 1267 if (!ieee80211_sdata_running(sdata)) 1268 return; 1269 1270 if (sdata->local->scanning) 1271 return; 1272 1273 if (sdata->local->tmp_channel) 1274 return; 1275 1276 mutex_lock(&ifmgd->mtx); 1277 1278 if (!ifmgd->associated) 1279 goto out; 1280 1281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1282 if (beacon && net_ratelimit()) 1283 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1284 "- sending probe request\n", sdata->name); 1285 #endif 1286 1287 /* 1288 * The driver/our work has already reported this event or the 1289 * connection monitoring has kicked in and we have already sent 1290 * a probe request. Or maybe the AP died and the driver keeps 1291 * reporting until we disassociate... 1292 * 1293 * In either case we have to ignore the current call to this 1294 * function (except for setting the correct probe reason bit) 1295 * because otherwise we would reset the timer every time and 1296 * never check whether we received a probe response! 1297 */ 1298 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1299 IEEE80211_STA_CONNECTION_POLL)) 1300 already = true; 1301 1302 if (beacon) 1303 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1304 else 1305 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1306 1307 if (already) 1308 goto out; 1309 1310 mutex_lock(&sdata->local->iflist_mtx); 1311 ieee80211_recalc_ps(sdata->local, -1); 1312 mutex_unlock(&sdata->local->iflist_mtx); 1313 1314 ifmgd->probe_send_count = 0; 1315 ieee80211_mgd_probe_ap_send(sdata); 1316 out: 1317 mutex_unlock(&ifmgd->mtx); 1318 } 1319 1320 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1321 struct ieee80211_vif *vif) 1322 { 1323 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1324 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1325 struct sk_buff *skb; 1326 const u8 *ssid; 1327 1328 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1329 return NULL; 1330 1331 ASSERT_MGD_MTX(ifmgd); 1332 1333 if (!ifmgd->associated) 1334 return NULL; 1335 1336 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1337 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1338 (u32) -1, ssid + 2, ssid[1], 1339 NULL, 0, true); 1340 1341 return skb; 1342 } 1343 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1344 1345 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1346 { 1347 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1348 struct ieee80211_local *local = sdata->local; 1349 u8 bssid[ETH_ALEN]; 1350 1351 mutex_lock(&ifmgd->mtx); 1352 if (!ifmgd->associated) { 1353 mutex_unlock(&ifmgd->mtx); 1354 return; 1355 } 1356 1357 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1358 1359 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1360 sdata->name, bssid); 1361 1362 ieee80211_set_disassoc(sdata, true, true); 1363 mutex_unlock(&ifmgd->mtx); 1364 1365 /* 1366 * must be outside lock due to cfg80211, 1367 * but that's not a problem. 1368 */ 1369 ieee80211_send_deauth_disassoc(sdata, bssid, 1370 IEEE80211_STYPE_DEAUTH, 1371 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1372 NULL, true); 1373 1374 mutex_lock(&local->mtx); 1375 ieee80211_recalc_idle(local); 1376 mutex_unlock(&local->mtx); 1377 } 1378 1379 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1380 { 1381 struct ieee80211_sub_if_data *sdata = 1382 container_of(work, struct ieee80211_sub_if_data, 1383 u.mgd.beacon_connection_loss_work); 1384 1385 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1386 __ieee80211_connection_loss(sdata); 1387 else 1388 ieee80211_mgd_probe_ap(sdata, true); 1389 } 1390 1391 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1392 { 1393 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1394 struct ieee80211_hw *hw = &sdata->local->hw; 1395 1396 trace_api_beacon_loss(sdata); 1397 1398 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1399 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1400 } 1401 EXPORT_SYMBOL(ieee80211_beacon_loss); 1402 1403 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1404 { 1405 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1406 struct ieee80211_hw *hw = &sdata->local->hw; 1407 1408 trace_api_connection_loss(sdata); 1409 1410 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1411 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1412 } 1413 EXPORT_SYMBOL(ieee80211_connection_loss); 1414 1415 1416 static enum rx_mgmt_action __must_check 1417 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1418 struct ieee80211_mgmt *mgmt, size_t len) 1419 { 1420 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1421 const u8 *bssid = NULL; 1422 u16 reason_code; 1423 1424 if (len < 24 + 2) 1425 return RX_MGMT_NONE; 1426 1427 ASSERT_MGD_MTX(ifmgd); 1428 1429 bssid = ifmgd->associated->bssid; 1430 1431 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1432 1433 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1434 sdata->name, bssid, reason_code); 1435 1436 ieee80211_set_disassoc(sdata, true, false); 1437 mutex_lock(&sdata->local->mtx); 1438 ieee80211_recalc_idle(sdata->local); 1439 mutex_unlock(&sdata->local->mtx); 1440 1441 return RX_MGMT_CFG80211_DEAUTH; 1442 } 1443 1444 1445 static enum rx_mgmt_action __must_check 1446 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1447 struct ieee80211_mgmt *mgmt, size_t len) 1448 { 1449 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1450 u16 reason_code; 1451 1452 if (len < 24 + 2) 1453 return RX_MGMT_NONE; 1454 1455 ASSERT_MGD_MTX(ifmgd); 1456 1457 if (WARN_ON(!ifmgd->associated)) 1458 return RX_MGMT_NONE; 1459 1460 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1461 return RX_MGMT_NONE; 1462 1463 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1464 1465 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1466 sdata->name, mgmt->sa, reason_code); 1467 1468 ieee80211_set_disassoc(sdata, true, false); 1469 mutex_lock(&sdata->local->mtx); 1470 ieee80211_recalc_idle(sdata->local); 1471 mutex_unlock(&sdata->local->mtx); 1472 return RX_MGMT_CFG80211_DISASSOC; 1473 } 1474 1475 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 1476 u8 *supp_rates, unsigned int supp_rates_len, 1477 u32 *rates, u32 *basic_rates, 1478 bool *have_higher_than_11mbit, 1479 int *min_rate, int *min_rate_index) 1480 { 1481 int i, j; 1482 1483 for (i = 0; i < supp_rates_len; i++) { 1484 int rate = (supp_rates[i] & 0x7f) * 5; 1485 bool is_basic = !!(supp_rates[i] & 0x80); 1486 1487 if (rate > 110) 1488 *have_higher_than_11mbit = true; 1489 1490 /* 1491 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 1492 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 1493 * 1494 * Note: Even through the membership selector and the basic 1495 * rate flag share the same bit, they are not exactly 1496 * the same. 1497 */ 1498 if (!!(supp_rates[i] & 0x80) && 1499 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 1500 continue; 1501 1502 for (j = 0; j < sband->n_bitrates; j++) { 1503 if (sband->bitrates[j].bitrate == rate) { 1504 *rates |= BIT(j); 1505 if (is_basic) 1506 *basic_rates |= BIT(j); 1507 if (rate < *min_rate) { 1508 *min_rate = rate; 1509 *min_rate_index = j; 1510 } 1511 break; 1512 } 1513 } 1514 } 1515 } 1516 1517 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1518 struct ieee80211_mgmt *mgmt, size_t len) 1519 { 1520 struct ieee80211_sub_if_data *sdata = wk->sdata; 1521 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1522 struct ieee80211_local *local = sdata->local; 1523 struct ieee80211_supported_band *sband; 1524 struct sta_info *sta; 1525 struct cfg80211_bss *cbss = wk->assoc.bss; 1526 u8 *pos; 1527 u32 rates, basic_rates; 1528 u16 capab_info, aid; 1529 struct ieee802_11_elems elems; 1530 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1531 u32 changed = 0; 1532 int err; 1533 bool have_higher_than_11mbit = false; 1534 u16 ap_ht_cap_flags; 1535 int min_rate = INT_MAX, min_rate_index = -1; 1536 1537 /* AssocResp and ReassocResp have identical structure */ 1538 1539 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1540 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1541 1542 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1543 printk(KERN_DEBUG 1544 "%s: invalid AID value 0x%x; bits 15:14 not set\n", 1545 sdata->name, aid); 1546 aid &= ~(BIT(15) | BIT(14)); 1547 1548 ifmgd->broken_ap = false; 1549 1550 if (aid == 0 || aid > IEEE80211_MAX_AID) { 1551 printk(KERN_DEBUG 1552 "%s: invalid AID value %d (out of range), turn off PS\n", 1553 sdata->name, aid); 1554 aid = 0; 1555 ifmgd->broken_ap = true; 1556 } 1557 1558 pos = mgmt->u.assoc_resp.variable; 1559 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1560 1561 if (!elems.supp_rates) { 1562 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1563 sdata->name); 1564 return false; 1565 } 1566 1567 ifmgd->aid = aid; 1568 1569 mutex_lock(&sdata->local->sta_mtx); 1570 /* 1571 * station info was already allocated and inserted before 1572 * the association and should be available to us 1573 */ 1574 sta = sta_info_get_rx(sdata, cbss->bssid); 1575 if (WARN_ON(!sta)) { 1576 mutex_unlock(&sdata->local->sta_mtx); 1577 return false; 1578 } 1579 1580 sta_info_move_state(sta, IEEE80211_STA_AUTH); 1581 sta_info_move_state(sta, IEEE80211_STA_ASSOC); 1582 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1583 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 1584 1585 rates = 0; 1586 basic_rates = 0; 1587 sband = local->hw.wiphy->bands[wk->chan->band]; 1588 1589 ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len, 1590 &rates, &basic_rates, &have_higher_than_11mbit, 1591 &min_rate, &min_rate_index); 1592 1593 ieee80211_get_rates(sband, elems.ext_supp_rates, 1594 elems.ext_supp_rates_len, &rates, &basic_rates, 1595 &have_higher_than_11mbit, 1596 &min_rate, &min_rate_index); 1597 1598 /* 1599 * some buggy APs don't advertise basic_rates. use the lowest 1600 * supported rate instead. 1601 */ 1602 if (unlikely(!basic_rates) && min_rate_index >= 0) { 1603 printk(KERN_DEBUG "%s: No basic rates in AssocResp. " 1604 "Using min supported rate instead.\n", sdata->name); 1605 basic_rates = BIT(min_rate_index); 1606 } 1607 1608 sta->sta.supp_rates[wk->chan->band] = rates; 1609 sdata->vif.bss_conf.basic_rates = basic_rates; 1610 1611 /* cf. IEEE 802.11 9.2.12 */ 1612 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1613 have_higher_than_11mbit) 1614 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1615 else 1616 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1617 1618 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1619 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1620 elems.ht_cap_elem, &sta->sta.ht_cap); 1621 1622 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1623 1624 rate_control_rate_init(sta); 1625 1626 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1627 set_sta_flag(sta, WLAN_STA_MFP); 1628 1629 if (elems.wmm_param) 1630 set_sta_flag(sta, WLAN_STA_WME); 1631 1632 /* sta_info_reinsert will also unlock the mutex lock */ 1633 err = sta_info_reinsert(sta); 1634 sta = NULL; 1635 if (err) { 1636 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1637 " the AP (error %d)\n", sdata->name, err); 1638 return false; 1639 } 1640 1641 /* 1642 * Always handle WMM once after association regardless 1643 * of the first value the AP uses. Setting -1 here has 1644 * that effect because the AP values is an unsigned 1645 * 4-bit value. 1646 */ 1647 ifmgd->wmm_last_param_set = -1; 1648 1649 if (elems.wmm_param) 1650 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1651 elems.wmm_param_len); 1652 else 1653 ieee80211_set_wmm_default(sdata); 1654 1655 local->oper_channel = wk->chan; 1656 1657 if (elems.ht_info_elem && elems.wmm_param && 1658 (sdata->local->hw.queues >= 4) && 1659 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1660 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1661 cbss->bssid, ap_ht_cap_flags, 1662 false); 1663 1664 /* set AID and assoc capability, 1665 * ieee80211_set_associated() will tell the driver */ 1666 bss_conf->aid = aid; 1667 bss_conf->assoc_capability = capab_info; 1668 ieee80211_set_associated(sdata, cbss, changed); 1669 1670 /* 1671 * If we're using 4-addr mode, let the AP know that we're 1672 * doing so, so that it can create the STA VLAN on its side 1673 */ 1674 if (ifmgd->use_4addr) 1675 ieee80211_send_4addr_nullfunc(local, sdata); 1676 1677 /* 1678 * Start timer to probe the connection to the AP now. 1679 * Also start the timer that will detect beacon loss. 1680 */ 1681 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1682 ieee80211_sta_reset_beacon_monitor(sdata); 1683 1684 return true; 1685 } 1686 1687 1688 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1689 struct ieee80211_mgmt *mgmt, 1690 size_t len, 1691 struct ieee80211_rx_status *rx_status, 1692 struct ieee802_11_elems *elems, 1693 bool beacon) 1694 { 1695 struct ieee80211_local *local = sdata->local; 1696 int freq; 1697 struct ieee80211_bss *bss; 1698 struct ieee80211_channel *channel; 1699 bool need_ps = false; 1700 1701 if (sdata->u.mgd.associated) { 1702 bss = (void *)sdata->u.mgd.associated->priv; 1703 /* not previously set so we may need to recalc */ 1704 need_ps = !bss->dtim_period; 1705 } 1706 1707 if (elems->ds_params && elems->ds_params_len == 1) 1708 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1709 rx_status->band); 1710 else 1711 freq = rx_status->freq; 1712 1713 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1714 1715 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1716 return; 1717 1718 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1719 channel, beacon); 1720 if (bss) 1721 ieee80211_rx_bss_put(local, bss); 1722 1723 if (!sdata->u.mgd.associated) 1724 return; 1725 1726 if (need_ps) { 1727 mutex_lock(&local->iflist_mtx); 1728 ieee80211_recalc_ps(local, -1); 1729 mutex_unlock(&local->iflist_mtx); 1730 } 1731 1732 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1733 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1734 ETH_ALEN) == 0)) { 1735 struct ieee80211_channel_sw_ie *sw_elem = 1736 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1737 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1738 bss, rx_status->mactime); 1739 } 1740 } 1741 1742 1743 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1744 struct sk_buff *skb) 1745 { 1746 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1747 struct ieee80211_if_managed *ifmgd; 1748 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1749 size_t baselen, len = skb->len; 1750 struct ieee802_11_elems elems; 1751 1752 ifmgd = &sdata->u.mgd; 1753 1754 ASSERT_MGD_MTX(ifmgd); 1755 1756 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1757 return; /* ignore ProbeResp to foreign address */ 1758 1759 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1760 if (baselen > len) 1761 return; 1762 1763 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1764 &elems); 1765 1766 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1767 1768 if (ifmgd->associated && 1769 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1770 ieee80211_reset_ap_probe(sdata); 1771 } 1772 1773 /* 1774 * This is the canonical list of information elements we care about, 1775 * the filter code also gives us all changes to the Microsoft OUI 1776 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1777 * 1778 * We implement beacon filtering in software since that means we can 1779 * avoid processing the frame here and in cfg80211, and userspace 1780 * will not be able to tell whether the hardware supports it or not. 1781 * 1782 * XXX: This list needs to be dynamic -- userspace needs to be able to 1783 * add items it requires. It also needs to be able to tell us to 1784 * look out for other vendor IEs. 1785 */ 1786 static const u64 care_about_ies = 1787 (1ULL << WLAN_EID_COUNTRY) | 1788 (1ULL << WLAN_EID_ERP_INFO) | 1789 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1790 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1791 (1ULL << WLAN_EID_HT_CAPABILITY) | 1792 (1ULL << WLAN_EID_HT_INFORMATION); 1793 1794 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1795 struct ieee80211_mgmt *mgmt, 1796 size_t len, 1797 struct ieee80211_rx_status *rx_status) 1798 { 1799 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1800 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1801 size_t baselen; 1802 struct ieee802_11_elems elems; 1803 struct ieee80211_local *local = sdata->local; 1804 u32 changed = 0; 1805 bool erp_valid, directed_tim = false; 1806 u8 erp_value = 0; 1807 u32 ncrc; 1808 u8 *bssid; 1809 1810 ASSERT_MGD_MTX(ifmgd); 1811 1812 /* Process beacon from the current BSS */ 1813 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1814 if (baselen > len) 1815 return; 1816 1817 if (rx_status->freq != local->hw.conf.channel->center_freq) 1818 return; 1819 1820 /* 1821 * We might have received a number of frames, among them a 1822 * disassoc frame and a beacon... 1823 */ 1824 if (!ifmgd->associated) 1825 return; 1826 1827 bssid = ifmgd->associated->bssid; 1828 1829 /* 1830 * And in theory even frames from a different AP we were just 1831 * associated to a split-second ago! 1832 */ 1833 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1834 return; 1835 1836 /* Track average RSSI from the Beacon frames of the current AP */ 1837 ifmgd->last_beacon_signal = rx_status->signal; 1838 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1839 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1840 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1841 ifmgd->last_cqm_event_signal = 0; 1842 ifmgd->count_beacon_signal = 1; 1843 ifmgd->last_ave_beacon_signal = 0; 1844 } else { 1845 ifmgd->ave_beacon_signal = 1846 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1847 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1848 ifmgd->ave_beacon_signal) / 16; 1849 ifmgd->count_beacon_signal++; 1850 } 1851 1852 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 1853 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 1854 int sig = ifmgd->ave_beacon_signal; 1855 int last_sig = ifmgd->last_ave_beacon_signal; 1856 1857 /* 1858 * if signal crosses either of the boundaries, invoke callback 1859 * with appropriate parameters 1860 */ 1861 if (sig > ifmgd->rssi_max_thold && 1862 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 1863 ifmgd->last_ave_beacon_signal = sig; 1864 drv_rssi_callback(local, RSSI_EVENT_HIGH); 1865 } else if (sig < ifmgd->rssi_min_thold && 1866 (last_sig >= ifmgd->rssi_max_thold || 1867 last_sig == 0)) { 1868 ifmgd->last_ave_beacon_signal = sig; 1869 drv_rssi_callback(local, RSSI_EVENT_LOW); 1870 } 1871 } 1872 1873 if (bss_conf->cqm_rssi_thold && 1874 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1875 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1876 int sig = ifmgd->ave_beacon_signal / 16; 1877 int last_event = ifmgd->last_cqm_event_signal; 1878 int thold = bss_conf->cqm_rssi_thold; 1879 int hyst = bss_conf->cqm_rssi_hyst; 1880 if (sig < thold && 1881 (last_event == 0 || sig < last_event - hyst)) { 1882 ifmgd->last_cqm_event_signal = sig; 1883 ieee80211_cqm_rssi_notify( 1884 &sdata->vif, 1885 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1886 GFP_KERNEL); 1887 } else if (sig > thold && 1888 (last_event == 0 || sig > last_event + hyst)) { 1889 ifmgd->last_cqm_event_signal = sig; 1890 ieee80211_cqm_rssi_notify( 1891 &sdata->vif, 1892 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1893 GFP_KERNEL); 1894 } 1895 } 1896 1897 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1899 if (net_ratelimit()) { 1900 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1901 "to a received beacon\n", sdata->name); 1902 } 1903 #endif 1904 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1905 mutex_lock(&local->iflist_mtx); 1906 ieee80211_recalc_ps(local, -1); 1907 mutex_unlock(&local->iflist_mtx); 1908 } 1909 1910 /* 1911 * Push the beacon loss detection into the future since 1912 * we are processing a beacon from the AP just now. 1913 */ 1914 ieee80211_sta_reset_beacon_monitor(sdata); 1915 1916 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1917 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1918 len - baselen, &elems, 1919 care_about_ies, ncrc); 1920 1921 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1922 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1923 ifmgd->aid); 1924 1925 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1926 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1927 true); 1928 1929 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1930 elems.wmm_param_len); 1931 } 1932 1933 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1934 if (directed_tim) { 1935 if (local->hw.conf.dynamic_ps_timeout > 0) { 1936 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1937 ieee80211_hw_config(local, 1938 IEEE80211_CONF_CHANGE_PS); 1939 ieee80211_send_nullfunc(local, sdata, 0); 1940 } else { 1941 local->pspolling = true; 1942 1943 /* 1944 * Here is assumed that the driver will be 1945 * able to send ps-poll frame and receive a 1946 * response even though power save mode is 1947 * enabled, but some drivers might require 1948 * to disable power save here. This needs 1949 * to be investigated. 1950 */ 1951 ieee80211_send_pspoll(local, sdata); 1952 } 1953 } 1954 } 1955 1956 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1957 return; 1958 ifmgd->beacon_crc = ncrc; 1959 ifmgd->beacon_crc_valid = true; 1960 1961 if (elems.erp_info && elems.erp_info_len >= 1) { 1962 erp_valid = true; 1963 erp_value = elems.erp_info[0]; 1964 } else { 1965 erp_valid = false; 1966 } 1967 changed |= ieee80211_handle_bss_capability(sdata, 1968 le16_to_cpu(mgmt->u.beacon.capab_info), 1969 erp_valid, erp_value); 1970 1971 1972 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1973 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1974 struct sta_info *sta; 1975 struct ieee80211_supported_band *sband; 1976 u16 ap_ht_cap_flags; 1977 1978 rcu_read_lock(); 1979 1980 sta = sta_info_get(sdata, bssid); 1981 if (WARN_ON(!sta)) { 1982 rcu_read_unlock(); 1983 return; 1984 } 1985 1986 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1987 1988 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1989 elems.ht_cap_elem, &sta->sta.ht_cap); 1990 1991 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1992 1993 rcu_read_unlock(); 1994 1995 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1996 bssid, ap_ht_cap_flags, true); 1997 } 1998 1999 /* Note: country IE parsing is done for us by cfg80211 */ 2000 if (elems.country_elem) { 2001 /* TODO: IBSS also needs this */ 2002 if (elems.pwr_constr_elem) 2003 ieee80211_handle_pwr_constr(sdata, 2004 le16_to_cpu(mgmt->u.probe_resp.capab_info), 2005 elems.pwr_constr_elem, 2006 elems.pwr_constr_elem_len); 2007 } 2008 2009 ieee80211_bss_info_change_notify(sdata, changed); 2010 } 2011 2012 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 2013 struct sk_buff *skb) 2014 { 2015 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2016 struct ieee80211_rx_status *rx_status; 2017 struct ieee80211_mgmt *mgmt; 2018 enum rx_mgmt_action rma = RX_MGMT_NONE; 2019 u16 fc; 2020 2021 rx_status = (struct ieee80211_rx_status *) skb->cb; 2022 mgmt = (struct ieee80211_mgmt *) skb->data; 2023 fc = le16_to_cpu(mgmt->frame_control); 2024 2025 mutex_lock(&ifmgd->mtx); 2026 2027 if (ifmgd->associated && 2028 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 2029 switch (fc & IEEE80211_FCTL_STYPE) { 2030 case IEEE80211_STYPE_BEACON: 2031 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 2032 rx_status); 2033 break; 2034 case IEEE80211_STYPE_PROBE_RESP: 2035 ieee80211_rx_mgmt_probe_resp(sdata, skb); 2036 break; 2037 case IEEE80211_STYPE_DEAUTH: 2038 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 2039 break; 2040 case IEEE80211_STYPE_DISASSOC: 2041 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 2042 break; 2043 case IEEE80211_STYPE_ACTION: 2044 switch (mgmt->u.action.category) { 2045 case WLAN_CATEGORY_SPECTRUM_MGMT: 2046 ieee80211_sta_process_chanswitch(sdata, 2047 &mgmt->u.action.u.chan_switch.sw_elem, 2048 (void *)ifmgd->associated->priv, 2049 rx_status->mactime); 2050 break; 2051 } 2052 } 2053 mutex_unlock(&ifmgd->mtx); 2054 2055 switch (rma) { 2056 case RX_MGMT_NONE: 2057 /* no action */ 2058 break; 2059 case RX_MGMT_CFG80211_DEAUTH: 2060 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2061 break; 2062 case RX_MGMT_CFG80211_DISASSOC: 2063 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 2064 break; 2065 default: 2066 WARN(1, "unexpected: %d", rma); 2067 } 2068 return; 2069 } 2070 2071 mutex_unlock(&ifmgd->mtx); 2072 2073 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 2074 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 2075 struct ieee80211_local *local = sdata->local; 2076 struct ieee80211_work *wk; 2077 2078 mutex_lock(&local->mtx); 2079 list_for_each_entry(wk, &local->work_list, list) { 2080 if (wk->sdata != sdata) 2081 continue; 2082 2083 if (wk->type != IEEE80211_WORK_ASSOC && 2084 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2085 continue; 2086 2087 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 2088 continue; 2089 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 2090 continue; 2091 2092 /* 2093 * Printing the message only here means we can't 2094 * spuriously print it, but it also means that it 2095 * won't be printed when the frame comes in before 2096 * we even tried to associate or in similar cases. 2097 * 2098 * Ultimately, I suspect cfg80211 should print the 2099 * messages instead. 2100 */ 2101 printk(KERN_DEBUG 2102 "%s: deauthenticated from %pM (Reason: %u)\n", 2103 sdata->name, mgmt->bssid, 2104 le16_to_cpu(mgmt->u.deauth.reason_code)); 2105 2106 list_del_rcu(&wk->list); 2107 free_work(wk); 2108 break; 2109 } 2110 mutex_unlock(&local->mtx); 2111 2112 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2113 } 2114 } 2115 2116 static void ieee80211_sta_timer(unsigned long data) 2117 { 2118 struct ieee80211_sub_if_data *sdata = 2119 (struct ieee80211_sub_if_data *) data; 2120 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2121 struct ieee80211_local *local = sdata->local; 2122 2123 if (local->quiescing) { 2124 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2125 return; 2126 } 2127 2128 ieee80211_queue_work(&local->hw, &sdata->work); 2129 } 2130 2131 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2132 u8 *bssid, u8 reason) 2133 { 2134 struct ieee80211_local *local = sdata->local; 2135 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2136 2137 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2138 IEEE80211_STA_BEACON_POLL); 2139 2140 ieee80211_set_disassoc(sdata, true, true); 2141 mutex_unlock(&ifmgd->mtx); 2142 /* 2143 * must be outside lock due to cfg80211, 2144 * but that's not a problem. 2145 */ 2146 ieee80211_send_deauth_disassoc(sdata, bssid, 2147 IEEE80211_STYPE_DEAUTH, reason, 2148 NULL, true); 2149 2150 mutex_lock(&local->mtx); 2151 ieee80211_recalc_idle(local); 2152 mutex_unlock(&local->mtx); 2153 2154 mutex_lock(&ifmgd->mtx); 2155 } 2156 2157 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2158 { 2159 struct ieee80211_local *local = sdata->local; 2160 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2161 2162 /* then process the rest of the work */ 2163 mutex_lock(&ifmgd->mtx); 2164 2165 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2166 IEEE80211_STA_CONNECTION_POLL) && 2167 ifmgd->associated) { 2168 u8 bssid[ETH_ALEN]; 2169 int max_tries; 2170 2171 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2172 2173 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2174 max_tries = max_nullfunc_tries; 2175 else 2176 max_tries = max_probe_tries; 2177 2178 /* ACK received for nullfunc probing frame */ 2179 if (!ifmgd->probe_send_count) 2180 ieee80211_reset_ap_probe(sdata); 2181 else if (ifmgd->nullfunc_failed) { 2182 if (ifmgd->probe_send_count < max_tries) { 2183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2184 wiphy_debug(local->hw.wiphy, 2185 "%s: No ack for nullfunc frame to" 2186 " AP %pM, try %d/%i\n", 2187 sdata->name, bssid, 2188 ifmgd->probe_send_count, max_tries); 2189 #endif 2190 ieee80211_mgd_probe_ap_send(sdata); 2191 } else { 2192 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2193 wiphy_debug(local->hw.wiphy, 2194 "%s: No ack for nullfunc frame to" 2195 " AP %pM, disconnecting.\n", 2196 sdata->name, bssid); 2197 #endif 2198 ieee80211_sta_connection_lost(sdata, bssid, 2199 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2200 } 2201 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2202 run_again(ifmgd, ifmgd->probe_timeout); 2203 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2205 wiphy_debug(local->hw.wiphy, 2206 "%s: Failed to send nullfunc to AP %pM" 2207 " after %dms, disconnecting.\n", 2208 sdata->name, 2209 bssid, probe_wait_ms); 2210 #endif 2211 ieee80211_sta_connection_lost(sdata, bssid, 2212 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2213 } else if (ifmgd->probe_send_count < max_tries) { 2214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2215 wiphy_debug(local->hw.wiphy, 2216 "%s: No probe response from AP %pM" 2217 " after %dms, try %d/%i\n", 2218 sdata->name, 2219 bssid, probe_wait_ms, 2220 ifmgd->probe_send_count, max_tries); 2221 #endif 2222 ieee80211_mgd_probe_ap_send(sdata); 2223 } else { 2224 /* 2225 * We actually lost the connection ... or did we? 2226 * Let's make sure! 2227 */ 2228 wiphy_debug(local->hw.wiphy, 2229 "%s: No probe response from AP %pM" 2230 " after %dms, disconnecting.\n", 2231 sdata->name, 2232 bssid, probe_wait_ms); 2233 2234 ieee80211_sta_connection_lost(sdata, bssid, 2235 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2236 } 2237 } 2238 2239 mutex_unlock(&ifmgd->mtx); 2240 } 2241 2242 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2243 { 2244 struct ieee80211_sub_if_data *sdata = 2245 (struct ieee80211_sub_if_data *) data; 2246 struct ieee80211_local *local = sdata->local; 2247 2248 if (local->quiescing) 2249 return; 2250 2251 ieee80211_queue_work(&sdata->local->hw, 2252 &sdata->u.mgd.beacon_connection_loss_work); 2253 } 2254 2255 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2256 { 2257 struct ieee80211_sub_if_data *sdata = 2258 (struct ieee80211_sub_if_data *) data; 2259 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2260 struct ieee80211_local *local = sdata->local; 2261 2262 if (local->quiescing) 2263 return; 2264 2265 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2266 } 2267 2268 static void ieee80211_sta_monitor_work(struct work_struct *work) 2269 { 2270 struct ieee80211_sub_if_data *sdata = 2271 container_of(work, struct ieee80211_sub_if_data, 2272 u.mgd.monitor_work); 2273 2274 ieee80211_mgd_probe_ap(sdata, false); 2275 } 2276 2277 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2278 { 2279 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2280 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2281 IEEE80211_STA_CONNECTION_POLL); 2282 2283 /* let's probe the connection once */ 2284 ieee80211_queue_work(&sdata->local->hw, 2285 &sdata->u.mgd.monitor_work); 2286 /* and do all the other regular work too */ 2287 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2288 } 2289 } 2290 2291 #ifdef CONFIG_PM 2292 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2293 { 2294 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2295 2296 /* 2297 * we need to use atomic bitops for the running bits 2298 * only because both timers might fire at the same 2299 * time -- the code here is properly synchronised. 2300 */ 2301 2302 cancel_work_sync(&ifmgd->request_smps_work); 2303 2304 cancel_work_sync(&ifmgd->monitor_work); 2305 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2306 if (del_timer_sync(&ifmgd->timer)) 2307 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2308 2309 cancel_work_sync(&ifmgd->chswitch_work); 2310 if (del_timer_sync(&ifmgd->chswitch_timer)) 2311 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2312 2313 /* these will just be re-established on connection */ 2314 del_timer_sync(&ifmgd->conn_mon_timer); 2315 del_timer_sync(&ifmgd->bcn_mon_timer); 2316 } 2317 2318 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2319 { 2320 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2321 2322 if (!ifmgd->associated) 2323 return; 2324 2325 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2326 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2327 mutex_lock(&ifmgd->mtx); 2328 if (ifmgd->associated) { 2329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2330 wiphy_debug(sdata->local->hw.wiphy, 2331 "%s: driver requested disconnect after resume.\n", 2332 sdata->name); 2333 #endif 2334 ieee80211_sta_connection_lost(sdata, 2335 ifmgd->associated->bssid, 2336 WLAN_REASON_UNSPECIFIED); 2337 mutex_unlock(&ifmgd->mtx); 2338 return; 2339 } 2340 mutex_unlock(&ifmgd->mtx); 2341 } 2342 2343 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2344 add_timer(&ifmgd->timer); 2345 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2346 add_timer(&ifmgd->chswitch_timer); 2347 ieee80211_sta_reset_beacon_monitor(sdata); 2348 ieee80211_restart_sta_timer(sdata); 2349 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); 2350 } 2351 #endif 2352 2353 /* interface setup */ 2354 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2355 { 2356 struct ieee80211_if_managed *ifmgd; 2357 2358 ifmgd = &sdata->u.mgd; 2359 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2360 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2361 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2362 ieee80211_beacon_connection_loss_work); 2363 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2364 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2365 (unsigned long) sdata); 2366 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2367 (unsigned long) sdata); 2368 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2369 (unsigned long) sdata); 2370 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2371 (unsigned long) sdata); 2372 2373 ifmgd->flags = 0; 2374 ifmgd->powersave = sdata->wdev.ps; 2375 2376 mutex_init(&ifmgd->mtx); 2377 2378 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2379 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2380 else 2381 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2382 } 2383 2384 /* scan finished notification */ 2385 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2386 { 2387 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2388 2389 /* Restart STA timers */ 2390 rcu_read_lock(); 2391 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2392 ieee80211_restart_sta_timer(sdata); 2393 rcu_read_unlock(); 2394 } 2395 2396 int ieee80211_max_network_latency(struct notifier_block *nb, 2397 unsigned long data, void *dummy) 2398 { 2399 s32 latency_usec = (s32) data; 2400 struct ieee80211_local *local = 2401 container_of(nb, struct ieee80211_local, 2402 network_latency_notifier); 2403 2404 mutex_lock(&local->iflist_mtx); 2405 ieee80211_recalc_ps(local, latency_usec); 2406 mutex_unlock(&local->iflist_mtx); 2407 2408 return 0; 2409 } 2410 2411 /* config hooks */ 2412 static enum work_done_result 2413 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2414 struct sk_buff *skb) 2415 { 2416 struct ieee80211_local *local = wk->sdata->local; 2417 2418 if (!skb) { 2419 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2420 goto destroy; 2421 } 2422 2423 if (wk->type == IEEE80211_WORK_AUTH) { 2424 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2425 goto destroy; 2426 } 2427 2428 mutex_lock(&wk->sdata->u.mgd.mtx); 2429 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2430 mutex_unlock(&wk->sdata->u.mgd.mtx); 2431 2432 wk->type = IEEE80211_WORK_AUTH; 2433 wk->probe_auth.tries = 0; 2434 return WORK_DONE_REQUEUE; 2435 destroy: 2436 if (wk->probe_auth.synced) 2437 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2438 IEEE80211_TX_SYNC_AUTH); 2439 2440 return WORK_DONE_DESTROY; 2441 } 2442 2443 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2444 struct cfg80211_auth_request *req) 2445 { 2446 const u8 *ssid; 2447 struct ieee80211_work *wk; 2448 u16 auth_alg; 2449 2450 if (req->local_state_change) 2451 return 0; /* no need to update mac80211 state */ 2452 2453 switch (req->auth_type) { 2454 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2455 auth_alg = WLAN_AUTH_OPEN; 2456 break; 2457 case NL80211_AUTHTYPE_SHARED_KEY: 2458 if (IS_ERR(sdata->local->wep_tx_tfm)) 2459 return -EOPNOTSUPP; 2460 auth_alg = WLAN_AUTH_SHARED_KEY; 2461 break; 2462 case NL80211_AUTHTYPE_FT: 2463 auth_alg = WLAN_AUTH_FT; 2464 break; 2465 case NL80211_AUTHTYPE_NETWORK_EAP: 2466 auth_alg = WLAN_AUTH_LEAP; 2467 break; 2468 default: 2469 return -EOPNOTSUPP; 2470 } 2471 2472 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2473 if (!wk) 2474 return -ENOMEM; 2475 2476 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2477 2478 if (req->ie && req->ie_len) { 2479 memcpy(wk->ie, req->ie, req->ie_len); 2480 wk->ie_len = req->ie_len; 2481 } 2482 2483 if (req->key && req->key_len) { 2484 wk->probe_auth.key_len = req->key_len; 2485 wk->probe_auth.key_idx = req->key_idx; 2486 memcpy(wk->probe_auth.key, req->key, req->key_len); 2487 } 2488 2489 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2490 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2491 wk->probe_auth.ssid_len = ssid[1]; 2492 2493 wk->probe_auth.algorithm = auth_alg; 2494 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2495 2496 /* if we already have a probe, don't probe again */ 2497 if (req->bss->proberesp_ies) 2498 wk->type = IEEE80211_WORK_AUTH; 2499 else 2500 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2501 wk->chan = req->bss->channel; 2502 wk->chan_type = NL80211_CHAN_NO_HT; 2503 wk->sdata = sdata; 2504 wk->done = ieee80211_probe_auth_done; 2505 2506 ieee80211_add_work(wk); 2507 return 0; 2508 } 2509 2510 /* create and insert a dummy station entry */ 2511 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata, 2512 u8 *bssid) { 2513 struct sta_info *sta; 2514 int err; 2515 2516 sta = sta_info_alloc(sdata, bssid, GFP_KERNEL); 2517 if (!sta) 2518 return -ENOMEM; 2519 2520 sta->dummy = true; 2521 2522 err = sta_info_insert(sta); 2523 sta = NULL; 2524 if (err) { 2525 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for" 2526 " the AP (error %d)\n", sdata->name, err); 2527 return err; 2528 } 2529 2530 return 0; 2531 } 2532 2533 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2534 struct sk_buff *skb) 2535 { 2536 struct ieee80211_local *local = wk->sdata->local; 2537 struct ieee80211_mgmt *mgmt; 2538 struct ieee80211_rx_status *rx_status; 2539 struct ieee802_11_elems elems; 2540 struct cfg80211_bss *cbss = wk->assoc.bss; 2541 u16 status; 2542 2543 if (!skb) { 2544 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2545 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2546 goto destroy; 2547 } 2548 2549 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2550 mutex_lock(&wk->sdata->u.mgd.mtx); 2551 rx_status = (void *) skb->cb; 2552 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2553 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2554 &elems, true); 2555 mutex_unlock(&wk->sdata->u.mgd.mtx); 2556 2557 wk->type = IEEE80211_WORK_ASSOC; 2558 /* not really done yet */ 2559 return WORK_DONE_REQUEUE; 2560 } 2561 2562 mgmt = (void *)skb->data; 2563 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2564 2565 if (status == WLAN_STATUS_SUCCESS) { 2566 if (wk->assoc.synced) 2567 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2568 IEEE80211_TX_SYNC_ASSOC); 2569 2570 mutex_lock(&wk->sdata->u.mgd.mtx); 2571 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2572 mutex_unlock(&wk->sdata->u.mgd.mtx); 2573 /* oops -- internal error -- send timeout for now */ 2574 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2575 cfg80211_send_assoc_timeout(wk->sdata->dev, 2576 wk->filter_ta); 2577 return WORK_DONE_DESTROY; 2578 } 2579 2580 mutex_unlock(&wk->sdata->u.mgd.mtx); 2581 } else { 2582 /* assoc failed - destroy the dummy station entry */ 2583 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2584 } 2585 2586 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2587 destroy: 2588 if (wk->assoc.synced) 2589 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2590 IEEE80211_TX_SYNC_ASSOC); 2591 2592 return WORK_DONE_DESTROY; 2593 } 2594 2595 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2596 struct cfg80211_assoc_request *req) 2597 { 2598 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2599 struct ieee80211_bss *bss = (void *)req->bss->priv; 2600 struct ieee80211_work *wk; 2601 const u8 *ssid; 2602 int i, err; 2603 2604 mutex_lock(&ifmgd->mtx); 2605 if (ifmgd->associated) { 2606 if (!req->prev_bssid || 2607 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2608 ETH_ALEN)) { 2609 /* 2610 * We are already associated and the request was not a 2611 * reassociation request from the current BSS, so 2612 * reject it. 2613 */ 2614 mutex_unlock(&ifmgd->mtx); 2615 return -EALREADY; 2616 } 2617 2618 /* Trying to reassociate - clear previous association state */ 2619 ieee80211_set_disassoc(sdata, true, false); 2620 } 2621 mutex_unlock(&ifmgd->mtx); 2622 2623 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2624 if (!wk) 2625 return -ENOMEM; 2626 2627 /* 2628 * create a dummy station info entry in order 2629 * to start accepting incoming EAPOL packets from the station 2630 */ 2631 err = ieee80211_pre_assoc(sdata, req->bss->bssid); 2632 if (err) { 2633 kfree(wk); 2634 return err; 2635 } 2636 2637 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2638 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2639 2640 ifmgd->beacon_crc_valid = false; 2641 2642 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2643 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2644 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2645 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2646 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2647 2648 2649 if (req->flags & ASSOC_REQ_DISABLE_HT) 2650 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2651 2652 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 2653 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 2654 sizeof(ifmgd->ht_capa_mask)); 2655 2656 if (req->ie && req->ie_len) { 2657 memcpy(wk->ie, req->ie, req->ie_len); 2658 wk->ie_len = req->ie_len; 2659 } else 2660 wk->ie_len = 0; 2661 2662 wk->assoc.bss = req->bss; 2663 2664 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2665 2666 /* new association always uses requested smps mode */ 2667 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2668 if (ifmgd->powersave) 2669 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2670 else 2671 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2672 } else 2673 ifmgd->ap_smps = ifmgd->req_smps; 2674 2675 wk->assoc.smps = ifmgd->ap_smps; 2676 /* 2677 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2678 * We still associate in non-HT mode (11a/b/g) if any one of these 2679 * ciphers is configured as pairwise. 2680 * We can set this to true for non-11n hardware, that'll be checked 2681 * separately along with the peer capabilities. 2682 */ 2683 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2684 wk->assoc.capability = req->bss->capability; 2685 wk->assoc.wmm_used = bss->wmm_used; 2686 wk->assoc.supp_rates = bss->supp_rates; 2687 wk->assoc.supp_rates_len = bss->supp_rates_len; 2688 wk->assoc.ht_information_ie = 2689 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2690 2691 if (bss->wmm_used && bss->uapsd_supported && 2692 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2693 wk->assoc.uapsd_used = true; 2694 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2695 } else { 2696 wk->assoc.uapsd_used = false; 2697 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2698 } 2699 2700 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2701 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2702 wk->assoc.ssid_len = ssid[1]; 2703 2704 if (req->prev_bssid) 2705 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2706 2707 wk->chan = req->bss->channel; 2708 wk->chan_type = NL80211_CHAN_NO_HT; 2709 wk->sdata = sdata; 2710 wk->done = ieee80211_assoc_done; 2711 if (!bss->dtim_period && 2712 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2713 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2714 else 2715 wk->type = IEEE80211_WORK_ASSOC; 2716 2717 if (req->use_mfp) { 2718 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2719 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2720 } else { 2721 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2722 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2723 } 2724 2725 if (req->crypto.control_port) 2726 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2727 else 2728 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2729 2730 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2731 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2732 2733 ieee80211_add_work(wk); 2734 return 0; 2735 } 2736 2737 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2738 struct cfg80211_deauth_request *req, 2739 void *cookie) 2740 { 2741 struct ieee80211_local *local = sdata->local; 2742 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2743 struct ieee80211_work *wk; 2744 u8 bssid[ETH_ALEN]; 2745 bool assoc_bss = false; 2746 2747 mutex_lock(&ifmgd->mtx); 2748 2749 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2750 if (ifmgd->associated == req->bss) { 2751 ieee80211_set_disassoc(sdata, false, true); 2752 mutex_unlock(&ifmgd->mtx); 2753 assoc_bss = true; 2754 } else { 2755 bool not_auth_yet = false; 2756 2757 mutex_unlock(&ifmgd->mtx); 2758 2759 mutex_lock(&local->mtx); 2760 list_for_each_entry(wk, &local->work_list, list) { 2761 if (wk->sdata != sdata) 2762 continue; 2763 2764 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2765 wk->type != IEEE80211_WORK_AUTH && 2766 wk->type != IEEE80211_WORK_ASSOC && 2767 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2768 continue; 2769 2770 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2771 continue; 2772 2773 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2774 list_del_rcu(&wk->list); 2775 free_work(wk); 2776 break; 2777 } 2778 mutex_unlock(&local->mtx); 2779 2780 /* 2781 * If somebody requests authentication and we haven't 2782 * sent out an auth frame yet there's no need to send 2783 * out a deauth frame either. If the state was PROBE, 2784 * then this is the case. If it's AUTH we have sent a 2785 * frame, and if it's IDLE we have completed the auth 2786 * process already. 2787 */ 2788 if (not_auth_yet) { 2789 __cfg80211_auth_canceled(sdata->dev, bssid); 2790 return 0; 2791 } 2792 } 2793 2794 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2795 sdata->name, bssid, req->reason_code); 2796 2797 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2798 req->reason_code, cookie, 2799 !req->local_state_change); 2800 if (assoc_bss) 2801 sta_info_flush(sdata->local, sdata); 2802 2803 mutex_lock(&sdata->local->mtx); 2804 ieee80211_recalc_idle(sdata->local); 2805 mutex_unlock(&sdata->local->mtx); 2806 2807 return 0; 2808 } 2809 2810 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2811 struct cfg80211_disassoc_request *req, 2812 void *cookie) 2813 { 2814 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2815 u8 bssid[ETH_ALEN]; 2816 2817 mutex_lock(&ifmgd->mtx); 2818 2819 /* 2820 * cfg80211 should catch this ... but it's racy since 2821 * we can receive a disassoc frame, process it, hand it 2822 * to cfg80211 while that's in a locked section already 2823 * trying to tell us that the user wants to disconnect. 2824 */ 2825 if (ifmgd->associated != req->bss) { 2826 mutex_unlock(&ifmgd->mtx); 2827 return -ENOLINK; 2828 } 2829 2830 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2831 sdata->name, req->bss->bssid, req->reason_code); 2832 2833 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2834 ieee80211_set_disassoc(sdata, false, true); 2835 2836 mutex_unlock(&ifmgd->mtx); 2837 2838 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2839 IEEE80211_STYPE_DISASSOC, req->reason_code, 2840 cookie, !req->local_state_change); 2841 sta_info_flush(sdata->local, sdata); 2842 2843 mutex_lock(&sdata->local->mtx); 2844 ieee80211_recalc_idle(sdata->local); 2845 mutex_unlock(&sdata->local->mtx); 2846 2847 return 0; 2848 } 2849 2850 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2851 enum nl80211_cqm_rssi_threshold_event rssi_event, 2852 gfp_t gfp) 2853 { 2854 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2855 2856 trace_api_cqm_rssi_notify(sdata, rssi_event); 2857 2858 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2859 } 2860 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2861 2862 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 2863 { 2864 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2865 return sdata->dev->operstate; 2866 } 2867 EXPORT_SYMBOL(ieee80211_get_operstate); 2868