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 #define IEEE80211_MAX_PROBE_TRIES 5 32 33 /* 34 * beacon loss detection timeout 35 * XXX: should depend on beacon interval 36 */ 37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ) 38 /* 39 * Time the connection can be idle before we probe 40 * it to see if we can still talk to the AP. 41 */ 42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 43 /* 44 * Time we wait for a probe response after sending 45 * a probe request because of beacon loss or for 46 * checking the connection still works. 47 */ 48 #define IEEE80211_PROBE_WAIT (HZ / 2) 49 50 /* 51 * Weight given to the latest Beacon frame when calculating average signal 52 * strength for Beacon frames received in the current BSS. This must be 53 * between 1 and 15. 54 */ 55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 56 57 #define TMR_RUNNING_TIMER 0 58 #define TMR_RUNNING_CHANSW 1 59 60 /* 61 * All cfg80211 functions have to be called outside a locked 62 * section so that they can acquire a lock themselves... This 63 * is much simpler than queuing up things in cfg80211, but we 64 * do need some indirection for that here. 65 */ 66 enum rx_mgmt_action { 67 /* no action required */ 68 RX_MGMT_NONE, 69 70 /* caller must call cfg80211_send_rx_auth() */ 71 RX_MGMT_CFG80211_AUTH, 72 73 /* caller must call cfg80211_send_rx_assoc() */ 74 RX_MGMT_CFG80211_ASSOC, 75 76 /* caller must call cfg80211_send_deauth() */ 77 RX_MGMT_CFG80211_DEAUTH, 78 79 /* caller must call cfg80211_send_disassoc() */ 80 RX_MGMT_CFG80211_DISASSOC, 81 82 /* caller must tell cfg80211 about internal error */ 83 RX_MGMT_CFG80211_ASSOC_ERROR, 84 }; 85 86 /* utils */ 87 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 88 { 89 WARN_ON(!mutex_is_locked(&ifmgd->mtx)); 90 } 91 92 /* 93 * We can have multiple work items (and connection probing) 94 * scheduling this timer, but we need to take care to only 95 * reschedule it when it should fire _earlier_ than it was 96 * asked for before, or if it's not pending right now. This 97 * function ensures that. Note that it then is required to 98 * run this function for all timeouts after the first one 99 * has happened -- the work that runs from this timer will 100 * do that. 101 */ 102 static void run_again(struct ieee80211_if_managed *ifmgd, 103 unsigned long timeout) 104 { 105 ASSERT_MGD_MTX(ifmgd); 106 107 if (!timer_pending(&ifmgd->timer) || 108 time_before(timeout, ifmgd->timer.expires)) 109 mod_timer(&ifmgd->timer, timeout); 110 } 111 112 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata) 113 { 114 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 115 return; 116 117 mod_timer(&sdata->u.mgd.bcn_mon_timer, 118 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME)); 119 } 120 121 static int ecw2cw(int ecw) 122 { 123 return (1 << ecw) - 1; 124 } 125 126 /* 127 * ieee80211_enable_ht should be called only after the operating band 128 * has been determined as ht configuration depends on the hw's 129 * HT abilities for a specific band. 130 */ 131 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 132 struct ieee80211_ht_info *hti, 133 const u8 *bssid, u16 ap_ht_cap_flags) 134 { 135 struct ieee80211_local *local = sdata->local; 136 struct ieee80211_supported_band *sband; 137 struct sta_info *sta; 138 u32 changed = 0; 139 u16 ht_opmode; 140 bool enable_ht = true; 141 enum nl80211_channel_type prev_chantype; 142 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 143 144 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 145 146 prev_chantype = sdata->vif.bss_conf.channel_type; 147 148 /* HT is not supported */ 149 if (!sband->ht_cap.ht_supported) 150 enable_ht = false; 151 152 /* check that channel matches the right operating channel */ 153 if (local->hw.conf.channel->center_freq != 154 ieee80211_channel_to_frequency(hti->control_chan)) 155 enable_ht = false; 156 157 if (enable_ht) { 158 channel_type = NL80211_CHAN_HT20; 159 160 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 161 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 162 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 163 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 164 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 165 if (!(local->hw.conf.channel->flags & 166 IEEE80211_CHAN_NO_HT40PLUS)) 167 channel_type = NL80211_CHAN_HT40PLUS; 168 break; 169 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 170 if (!(local->hw.conf.channel->flags & 171 IEEE80211_CHAN_NO_HT40MINUS)) 172 channel_type = NL80211_CHAN_HT40MINUS; 173 break; 174 } 175 } 176 } 177 178 if (local->tmp_channel) 179 local->tmp_channel_type = channel_type; 180 181 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 182 /* can only fail due to HT40+/- mismatch */ 183 channel_type = NL80211_CHAN_HT20; 184 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 185 } 186 187 /* channel_type change automatically detected */ 188 ieee80211_hw_config(local, 0); 189 190 if (prev_chantype != channel_type) { 191 rcu_read_lock(); 192 sta = sta_info_get(sdata, bssid); 193 if (sta) 194 rate_control_rate_update(local, sband, sta, 195 IEEE80211_RC_HT_CHANGED, 196 channel_type); 197 rcu_read_unlock(); 198 } 199 200 ht_opmode = le16_to_cpu(hti->operation_mode); 201 202 /* if bss configuration changed store the new one */ 203 if (sdata->ht_opmode_valid != enable_ht || 204 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 205 prev_chantype != channel_type) { 206 changed |= BSS_CHANGED_HT; 207 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 208 sdata->ht_opmode_valid = enable_ht; 209 } 210 211 return changed; 212 } 213 214 /* frame sending functions */ 215 216 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 217 const u8 *bssid, u16 stype, u16 reason, 218 void *cookie, bool send_frame) 219 { 220 struct ieee80211_local *local = sdata->local; 221 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 222 struct sk_buff *skb; 223 struct ieee80211_mgmt *mgmt; 224 225 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 226 if (!skb) { 227 printk(KERN_DEBUG "%s: failed to allocate buffer for " 228 "deauth/disassoc frame\n", sdata->name); 229 return; 230 } 231 skb_reserve(skb, local->hw.extra_tx_headroom); 232 233 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 234 memset(mgmt, 0, 24); 235 memcpy(mgmt->da, bssid, ETH_ALEN); 236 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 237 memcpy(mgmt->bssid, bssid, ETH_ALEN); 238 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 239 skb_put(skb, 2); 240 /* u.deauth.reason_code == u.disassoc.reason_code */ 241 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 242 243 if (stype == IEEE80211_STYPE_DEAUTH) 244 if (cookie) 245 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 246 else 247 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 248 else 249 if (cookie) 250 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 251 else 252 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 253 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 254 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 255 256 if (send_frame) 257 ieee80211_tx_skb(sdata, skb); 258 else 259 kfree_skb(skb); 260 } 261 262 void ieee80211_send_pspoll(struct ieee80211_local *local, 263 struct ieee80211_sub_if_data *sdata) 264 { 265 struct ieee80211_pspoll *pspoll; 266 struct sk_buff *skb; 267 268 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 269 if (!skb) 270 return; 271 272 pspoll = (struct ieee80211_pspoll *) skb->data; 273 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 274 275 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 276 ieee80211_tx_skb(sdata, skb); 277 } 278 279 void ieee80211_send_nullfunc(struct ieee80211_local *local, 280 struct ieee80211_sub_if_data *sdata, 281 int powersave) 282 { 283 struct sk_buff *skb; 284 struct ieee80211_hdr_3addr *nullfunc; 285 286 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 287 if (!skb) 288 return; 289 290 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 291 if (powersave) 292 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 293 294 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 295 ieee80211_tx_skb(sdata, skb); 296 } 297 298 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 299 struct ieee80211_sub_if_data *sdata) 300 { 301 struct sk_buff *skb; 302 struct ieee80211_hdr *nullfunc; 303 __le16 fc; 304 305 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 306 return; 307 308 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 309 if (!skb) { 310 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 311 "nullfunc frame\n", sdata->name); 312 return; 313 } 314 skb_reserve(skb, local->hw.extra_tx_headroom); 315 316 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 317 memset(nullfunc, 0, 30); 318 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 319 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 320 nullfunc->frame_control = fc; 321 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 322 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 323 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 324 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 325 326 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 327 ieee80211_tx_skb(sdata, skb); 328 } 329 330 /* spectrum management related things */ 331 static void ieee80211_chswitch_work(struct work_struct *work) 332 { 333 struct ieee80211_sub_if_data *sdata = 334 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 336 337 if (!ieee80211_sdata_running(sdata)) 338 return; 339 340 mutex_lock(&ifmgd->mtx); 341 if (!ifmgd->associated) 342 goto out; 343 344 sdata->local->oper_channel = sdata->local->csa_channel; 345 if (!sdata->local->ops->channel_switch) { 346 /* call "hw_config" only if doing sw channel switch */ 347 ieee80211_hw_config(sdata->local, 348 IEEE80211_CONF_CHANGE_CHANNEL); 349 } 350 351 /* XXX: shouldn't really modify cfg80211-owned data! */ 352 ifmgd->associated->channel = sdata->local->oper_channel; 353 354 ieee80211_wake_queues_by_reason(&sdata->local->hw, 355 IEEE80211_QUEUE_STOP_REASON_CSA); 356 out: 357 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 358 mutex_unlock(&ifmgd->mtx); 359 } 360 361 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 362 { 363 struct ieee80211_sub_if_data *sdata; 364 struct ieee80211_if_managed *ifmgd; 365 366 sdata = vif_to_sdata(vif); 367 ifmgd = &sdata->u.mgd; 368 369 trace_api_chswitch_done(sdata, success); 370 if (!success) { 371 /* 372 * If the channel switch was not successful, stay 373 * around on the old channel. We currently lack 374 * good handling of this situation, possibly we 375 * should just drop the association. 376 */ 377 sdata->local->csa_channel = sdata->local->oper_channel; 378 } 379 380 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 381 } 382 EXPORT_SYMBOL(ieee80211_chswitch_done); 383 384 static void ieee80211_chswitch_timer(unsigned long data) 385 { 386 struct ieee80211_sub_if_data *sdata = 387 (struct ieee80211_sub_if_data *) data; 388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 389 390 if (sdata->local->quiescing) { 391 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 392 return; 393 } 394 395 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 396 } 397 398 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 399 struct ieee80211_channel_sw_ie *sw_elem, 400 struct ieee80211_bss *bss, 401 u64 timestamp) 402 { 403 struct cfg80211_bss *cbss = 404 container_of((void *)bss, struct cfg80211_bss, priv); 405 struct ieee80211_channel *new_ch; 406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 407 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num); 408 409 ASSERT_MGD_MTX(ifmgd); 410 411 if (!ifmgd->associated) 412 return; 413 414 if (sdata->local->scanning) 415 return; 416 417 /* Disregard subsequent beacons if we are already running a timer 418 processing a CSA */ 419 420 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 421 return; 422 423 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 424 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 425 return; 426 427 sdata->local->csa_channel = new_ch; 428 429 if (sdata->local->ops->channel_switch) { 430 /* use driver's channel switch callback */ 431 struct ieee80211_channel_switch ch_switch; 432 memset(&ch_switch, 0, sizeof(ch_switch)); 433 ch_switch.timestamp = timestamp; 434 if (sw_elem->mode) { 435 ch_switch.block_tx = true; 436 ieee80211_stop_queues_by_reason(&sdata->local->hw, 437 IEEE80211_QUEUE_STOP_REASON_CSA); 438 } 439 ch_switch.channel = new_ch; 440 ch_switch.count = sw_elem->count; 441 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 442 drv_channel_switch(sdata->local, &ch_switch); 443 return; 444 } 445 446 /* channel switch handled in software */ 447 if (sw_elem->count <= 1) { 448 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 449 } else { 450 if (sw_elem->mode) 451 ieee80211_stop_queues_by_reason(&sdata->local->hw, 452 IEEE80211_QUEUE_STOP_REASON_CSA); 453 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 454 mod_timer(&ifmgd->chswitch_timer, 455 jiffies + 456 msecs_to_jiffies(sw_elem->count * 457 cbss->beacon_interval)); 458 } 459 } 460 461 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 462 u16 capab_info, u8 *pwr_constr_elem, 463 u8 pwr_constr_elem_len) 464 { 465 struct ieee80211_conf *conf = &sdata->local->hw.conf; 466 467 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 468 return; 469 470 /* Power constraint IE length should be 1 octet */ 471 if (pwr_constr_elem_len != 1) 472 return; 473 474 if ((*pwr_constr_elem <= conf->channel->max_power) && 475 (*pwr_constr_elem != sdata->local->power_constr_level)) { 476 sdata->local->power_constr_level = *pwr_constr_elem; 477 ieee80211_hw_config(sdata->local, 0); 478 } 479 } 480 481 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 482 { 483 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 484 struct ieee80211_local *local = sdata->local; 485 struct ieee80211_conf *conf = &local->hw.conf; 486 487 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 488 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 489 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 490 491 local->disable_dynamic_ps = false; 492 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 493 } 494 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 495 496 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 497 { 498 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 499 struct ieee80211_local *local = sdata->local; 500 struct ieee80211_conf *conf = &local->hw.conf; 501 502 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 503 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 504 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 505 506 local->disable_dynamic_ps = true; 507 conf->dynamic_ps_timeout = 0; 508 del_timer_sync(&local->dynamic_ps_timer); 509 ieee80211_queue_work(&local->hw, 510 &local->dynamic_ps_enable_work); 511 } 512 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 513 514 /* powersave */ 515 static void ieee80211_enable_ps(struct ieee80211_local *local, 516 struct ieee80211_sub_if_data *sdata) 517 { 518 struct ieee80211_conf *conf = &local->hw.conf; 519 520 /* 521 * If we are scanning right now then the parameters will 522 * take effect when scan finishes. 523 */ 524 if (local->scanning) 525 return; 526 527 if (conf->dynamic_ps_timeout > 0 && 528 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 529 mod_timer(&local->dynamic_ps_timer, jiffies + 530 msecs_to_jiffies(conf->dynamic_ps_timeout)); 531 } else { 532 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 533 ieee80211_send_nullfunc(local, sdata, 1); 534 535 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 536 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 537 return; 538 539 conf->flags |= IEEE80211_CONF_PS; 540 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 541 } 542 } 543 544 static void ieee80211_change_ps(struct ieee80211_local *local) 545 { 546 struct ieee80211_conf *conf = &local->hw.conf; 547 548 if (local->ps_sdata) { 549 ieee80211_enable_ps(local, local->ps_sdata); 550 } else if (conf->flags & IEEE80211_CONF_PS) { 551 conf->flags &= ~IEEE80211_CONF_PS; 552 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 553 del_timer_sync(&local->dynamic_ps_timer); 554 cancel_work_sync(&local->dynamic_ps_enable_work); 555 } 556 } 557 558 /* need to hold RTNL or interface lock */ 559 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 560 { 561 struct ieee80211_sub_if_data *sdata, *found = NULL; 562 int count = 0; 563 int timeout; 564 565 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 566 local->ps_sdata = NULL; 567 return; 568 } 569 570 if (!list_empty(&local->work_list)) { 571 local->ps_sdata = NULL; 572 goto change; 573 } 574 575 list_for_each_entry(sdata, &local->interfaces, list) { 576 if (!ieee80211_sdata_running(sdata)) 577 continue; 578 if (sdata->vif.type != NL80211_IFTYPE_STATION) 579 continue; 580 found = sdata; 581 count++; 582 } 583 584 if (count == 1 && found->u.mgd.powersave && 585 found->u.mgd.associated && 586 found->u.mgd.associated->beacon_ies && 587 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | 588 IEEE80211_STA_CONNECTION_POLL))) { 589 struct ieee80211_conf *conf = &local->hw.conf; 590 s32 beaconint_us; 591 592 if (latency < 0) 593 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 594 595 beaconint_us = ieee80211_tu_to_usec( 596 found->vif.bss_conf.beacon_int); 597 598 timeout = local->dynamic_ps_forced_timeout; 599 if (timeout < 0) { 600 /* 601 * Go to full PSM if the user configures a very low 602 * latency requirement. 603 * The 2 second value is there for compatibility until 604 * the PM_QOS_NETWORK_LATENCY is configured with real 605 * values. 606 */ 607 if (latency > 1900000000 && latency != 2000000000) 608 timeout = 0; 609 else 610 timeout = 100; 611 } 612 local->dynamic_ps_user_timeout = timeout; 613 if (!local->disable_dynamic_ps) 614 conf->dynamic_ps_timeout = 615 local->dynamic_ps_user_timeout; 616 617 if (beaconint_us > latency) { 618 local->ps_sdata = NULL; 619 } else { 620 struct ieee80211_bss *bss; 621 int maxslp = 1; 622 u8 dtimper; 623 624 bss = (void *)found->u.mgd.associated->priv; 625 dtimper = bss->dtim_period; 626 627 /* If the TIM IE is invalid, pretend the value is 1 */ 628 if (!dtimper) 629 dtimper = 1; 630 else if (dtimper > 1) 631 maxslp = min_t(int, dtimper, 632 latency / beaconint_us); 633 634 local->hw.conf.max_sleep_period = maxslp; 635 local->hw.conf.ps_dtim_period = dtimper; 636 local->ps_sdata = found; 637 } 638 } else { 639 local->ps_sdata = NULL; 640 } 641 642 change: 643 ieee80211_change_ps(local); 644 } 645 646 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 647 { 648 struct ieee80211_local *local = 649 container_of(work, struct ieee80211_local, 650 dynamic_ps_disable_work); 651 652 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 653 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 655 } 656 657 ieee80211_wake_queues_by_reason(&local->hw, 658 IEEE80211_QUEUE_STOP_REASON_PS); 659 } 660 661 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 662 { 663 struct ieee80211_local *local = 664 container_of(work, struct ieee80211_local, 665 dynamic_ps_enable_work); 666 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 667 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 668 669 /* can only happen when PS was just disabled anyway */ 670 if (!sdata) 671 return; 672 673 if (local->hw.conf.flags & IEEE80211_CONF_PS) 674 return; 675 676 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 677 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) 678 ieee80211_send_nullfunc(local, sdata, 1); 679 680 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 681 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 682 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 683 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 684 local->hw.conf.flags |= IEEE80211_CONF_PS; 685 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 686 } 687 } 688 689 void ieee80211_dynamic_ps_timer(unsigned long data) 690 { 691 struct ieee80211_local *local = (void *) data; 692 693 if (local->quiescing || local->suspended) 694 return; 695 696 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 697 } 698 699 /* MLME */ 700 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 701 struct ieee80211_sub_if_data *sdata, 702 u8 *wmm_param, size_t wmm_param_len) 703 { 704 struct ieee80211_tx_queue_params params; 705 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 706 size_t left; 707 int count; 708 u8 *pos, uapsd_queues = 0; 709 710 if (!local->ops->conf_tx) 711 return; 712 713 if (local->hw.queues < 4) 714 return; 715 716 if (!wmm_param) 717 return; 718 719 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 720 return; 721 722 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 723 uapsd_queues = local->uapsd_queues; 724 725 count = wmm_param[6] & 0x0f; 726 if (count == ifmgd->wmm_last_param_set) 727 return; 728 ifmgd->wmm_last_param_set = count; 729 730 pos = wmm_param + 8; 731 left = wmm_param_len - 8; 732 733 memset(¶ms, 0, sizeof(params)); 734 735 local->wmm_acm = 0; 736 for (; left >= 4; left -= 4, pos += 4) { 737 int aci = (pos[0] >> 5) & 0x03; 738 int acm = (pos[0] >> 4) & 0x01; 739 bool uapsd = false; 740 int queue; 741 742 switch (aci) { 743 case 1: /* AC_BK */ 744 queue = 3; 745 if (acm) 746 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 747 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 748 uapsd = true; 749 break; 750 case 2: /* AC_VI */ 751 queue = 1; 752 if (acm) 753 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 754 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 755 uapsd = true; 756 break; 757 case 3: /* AC_VO */ 758 queue = 0; 759 if (acm) 760 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 761 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 762 uapsd = true; 763 break; 764 case 0: /* AC_BE */ 765 default: 766 queue = 2; 767 if (acm) 768 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 769 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 770 uapsd = true; 771 break; 772 } 773 774 params.aifs = pos[0] & 0x0f; 775 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 776 params.cw_min = ecw2cw(pos[1] & 0x0f); 777 params.txop = get_unaligned_le16(pos + 2); 778 params.uapsd = uapsd; 779 780 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 781 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d " 782 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 783 wiphy_name(local->hw.wiphy), queue, aci, acm, 784 params.aifs, params.cw_min, params.cw_max, params.txop, 785 params.uapsd); 786 #endif 787 if (drv_conf_tx(local, queue, ¶ms)) 788 printk(KERN_DEBUG "%s: failed to set TX queue " 789 "parameters for queue %d\n", 790 wiphy_name(local->hw.wiphy), queue); 791 } 792 793 /* enable WMM or activate new settings */ 794 sdata->vif.bss_conf.qos = true; 795 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 796 } 797 798 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 799 u16 capab, bool erp_valid, u8 erp) 800 { 801 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 802 u32 changed = 0; 803 bool use_protection; 804 bool use_short_preamble; 805 bool use_short_slot; 806 807 if (erp_valid) { 808 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 809 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 810 } else { 811 use_protection = false; 812 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 813 } 814 815 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 816 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 817 use_short_slot = true; 818 819 if (use_protection != bss_conf->use_cts_prot) { 820 bss_conf->use_cts_prot = use_protection; 821 changed |= BSS_CHANGED_ERP_CTS_PROT; 822 } 823 824 if (use_short_preamble != bss_conf->use_short_preamble) { 825 bss_conf->use_short_preamble = use_short_preamble; 826 changed |= BSS_CHANGED_ERP_PREAMBLE; 827 } 828 829 if (use_short_slot != bss_conf->use_short_slot) { 830 bss_conf->use_short_slot = use_short_slot; 831 changed |= BSS_CHANGED_ERP_SLOT; 832 } 833 834 return changed; 835 } 836 837 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 838 struct cfg80211_bss *cbss, 839 u32 bss_info_changed) 840 { 841 struct ieee80211_bss *bss = (void *)cbss->priv; 842 struct ieee80211_local *local = sdata->local; 843 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 844 845 bss_info_changed |= BSS_CHANGED_ASSOC; 846 /* set timing information */ 847 bss_conf->beacon_int = cbss->beacon_interval; 848 bss_conf->timestamp = cbss->tsf; 849 850 bss_info_changed |= BSS_CHANGED_BEACON_INT; 851 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 852 cbss->capability, bss->has_erp_value, bss->erp_value); 853 854 sdata->u.mgd.associated = cbss; 855 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 856 857 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 858 859 /* just to be sure */ 860 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 861 IEEE80211_STA_BEACON_POLL); 862 863 /* 864 * Always handle WMM once after association regardless 865 * of the first value the AP uses. Setting -1 here has 866 * that effect because the AP values is an unsigned 867 * 4-bit value. 868 */ 869 sdata->u.mgd.wmm_last_param_set = -1; 870 871 ieee80211_led_assoc(local, 1); 872 873 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 874 bss_conf->dtim_period = bss->dtim_period; 875 else 876 bss_conf->dtim_period = 0; 877 878 bss_conf->assoc = 1; 879 /* 880 * For now just always ask the driver to update the basic rateset 881 * when we have associated, we aren't checking whether it actually 882 * changed or not. 883 */ 884 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 885 886 /* And the BSSID changed - we're associated now */ 887 bss_info_changed |= BSS_CHANGED_BSSID; 888 889 /* Tell the driver to monitor connection quality (if supported) */ 890 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 891 bss_conf->cqm_rssi_thold) 892 bss_info_changed |= BSS_CHANGED_CQM; 893 894 /* Enable ARP filtering */ 895 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 896 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 897 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 898 } 899 900 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 901 902 mutex_lock(&local->iflist_mtx); 903 ieee80211_recalc_ps(local, -1); 904 ieee80211_recalc_smps(local, sdata); 905 mutex_unlock(&local->iflist_mtx); 906 907 netif_tx_start_all_queues(sdata->dev); 908 netif_carrier_on(sdata->dev); 909 } 910 911 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 912 bool remove_sta) 913 { 914 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 915 struct ieee80211_local *local = sdata->local; 916 struct sta_info *sta; 917 u32 changed = 0, config_changed = 0; 918 u8 bssid[ETH_ALEN]; 919 920 ASSERT_MGD_MTX(ifmgd); 921 922 if (WARN_ON(!ifmgd->associated)) 923 return; 924 925 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 926 927 ifmgd->associated = NULL; 928 memset(ifmgd->bssid, 0, ETH_ALEN); 929 930 /* 931 * we need to commit the associated = NULL change because the 932 * scan code uses that to determine whether this iface should 933 * go to/wake up from powersave or not -- and could otherwise 934 * wake the queues erroneously. 935 */ 936 smp_mb(); 937 938 /* 939 * Thus, we can only afterwards stop the queues -- to account 940 * for the case where another CPU is finishing a scan at this 941 * time -- we don't want the scan code to enable queues. 942 */ 943 944 netif_tx_stop_all_queues(sdata->dev); 945 netif_carrier_off(sdata->dev); 946 947 mutex_lock(&local->sta_mtx); 948 sta = sta_info_get(sdata, bssid); 949 if (sta) { 950 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 951 ieee80211_sta_tear_down_BA_sessions(sta); 952 } 953 mutex_unlock(&local->sta_mtx); 954 955 changed |= ieee80211_reset_erp_info(sdata); 956 957 ieee80211_led_assoc(local, 0); 958 changed |= BSS_CHANGED_ASSOC; 959 sdata->vif.bss_conf.assoc = false; 960 961 ieee80211_set_wmm_default(sdata); 962 963 /* channel(_type) changes are handled by ieee80211_hw_config */ 964 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 965 966 /* on the next assoc, re-program HT parameters */ 967 sdata->ht_opmode_valid = false; 968 969 local->power_constr_level = 0; 970 971 del_timer_sync(&local->dynamic_ps_timer); 972 cancel_work_sync(&local->dynamic_ps_enable_work); 973 974 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 975 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 976 config_changed |= IEEE80211_CONF_CHANGE_PS; 977 } 978 979 ieee80211_hw_config(local, config_changed); 980 981 /* Disable ARP filtering */ 982 if (sdata->vif.bss_conf.arp_filter_enabled) { 983 sdata->vif.bss_conf.arp_filter_enabled = false; 984 changed |= BSS_CHANGED_ARP_FILTER; 985 } 986 987 /* The BSSID (not really interesting) and HT changed */ 988 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 989 ieee80211_bss_info_change_notify(sdata, changed); 990 991 if (remove_sta) 992 sta_info_destroy_addr(sdata, bssid); 993 } 994 995 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 996 struct ieee80211_hdr *hdr) 997 { 998 /* 999 * We can postpone the mgd.timer whenever receiving unicast frames 1000 * from AP because we know that the connection is working both ways 1001 * at that time. But multicast frames (and hence also beacons) must 1002 * be ignored here, because we need to trigger the timer during 1003 * data idle periods for sending the periodic probe request to the 1004 * AP we're connected to. 1005 */ 1006 if (is_multicast_ether_addr(hdr->addr1)) 1007 return; 1008 1009 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1010 return; 1011 1012 mod_timer(&sdata->u.mgd.conn_mon_timer, 1013 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 1014 } 1015 1016 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1017 { 1018 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1019 const u8 *ssid; 1020 1021 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1022 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid, 1023 ssid + 2, ssid[1], NULL, 0); 1024 1025 ifmgd->probe_send_count++; 1026 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT; 1027 run_again(ifmgd, ifmgd->probe_timeout); 1028 } 1029 1030 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1031 bool beacon) 1032 { 1033 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1034 bool already = false; 1035 1036 if (!ieee80211_sdata_running(sdata)) 1037 return; 1038 1039 if (sdata->local->scanning) 1040 return; 1041 1042 if (sdata->local->tmp_channel) 1043 return; 1044 1045 mutex_lock(&ifmgd->mtx); 1046 1047 if (!ifmgd->associated) 1048 goto out; 1049 1050 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1051 if (beacon && net_ratelimit()) 1052 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1053 "- sending probe request\n", sdata->name); 1054 #endif 1055 1056 /* 1057 * The driver/our work has already reported this event or the 1058 * connection monitoring has kicked in and we have already sent 1059 * a probe request. Or maybe the AP died and the driver keeps 1060 * reporting until we disassociate... 1061 * 1062 * In either case we have to ignore the current call to this 1063 * function (except for setting the correct probe reason bit) 1064 * because otherwise we would reset the timer every time and 1065 * never check whether we received a probe response! 1066 */ 1067 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1068 IEEE80211_STA_CONNECTION_POLL)) 1069 already = true; 1070 1071 if (beacon) 1072 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1073 else 1074 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1075 1076 if (already) 1077 goto out; 1078 1079 mutex_lock(&sdata->local->iflist_mtx); 1080 ieee80211_recalc_ps(sdata->local, -1); 1081 mutex_unlock(&sdata->local->iflist_mtx); 1082 1083 ifmgd->probe_send_count = 0; 1084 ieee80211_mgd_probe_ap_send(sdata); 1085 out: 1086 mutex_unlock(&ifmgd->mtx); 1087 } 1088 1089 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1090 { 1091 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1092 struct ieee80211_local *local = sdata->local; 1093 u8 bssid[ETH_ALEN]; 1094 1095 mutex_lock(&ifmgd->mtx); 1096 if (!ifmgd->associated) { 1097 mutex_unlock(&ifmgd->mtx); 1098 return; 1099 } 1100 1101 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1102 1103 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid); 1104 1105 ieee80211_set_disassoc(sdata, true); 1106 ieee80211_recalc_idle(local); 1107 mutex_unlock(&ifmgd->mtx); 1108 /* 1109 * must be outside lock due to cfg80211, 1110 * but that's not a problem. 1111 */ 1112 ieee80211_send_deauth_disassoc(sdata, bssid, 1113 IEEE80211_STYPE_DEAUTH, 1114 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1115 NULL, true); 1116 } 1117 1118 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1119 { 1120 struct ieee80211_sub_if_data *sdata = 1121 container_of(work, struct ieee80211_sub_if_data, 1122 u.mgd.beacon_connection_loss_work); 1123 1124 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1125 __ieee80211_connection_loss(sdata); 1126 else 1127 ieee80211_mgd_probe_ap(sdata, true); 1128 } 1129 1130 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1131 { 1132 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1133 struct ieee80211_hw *hw = &sdata->local->hw; 1134 1135 trace_api_beacon_loss(sdata); 1136 1137 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1138 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1139 } 1140 EXPORT_SYMBOL(ieee80211_beacon_loss); 1141 1142 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1143 { 1144 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1145 struct ieee80211_hw *hw = &sdata->local->hw; 1146 1147 trace_api_connection_loss(sdata); 1148 1149 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1150 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1151 } 1152 EXPORT_SYMBOL(ieee80211_connection_loss); 1153 1154 1155 static enum rx_mgmt_action __must_check 1156 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1157 struct ieee80211_mgmt *mgmt, size_t len) 1158 { 1159 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1160 const u8 *bssid = NULL; 1161 u16 reason_code; 1162 1163 if (len < 24 + 2) 1164 return RX_MGMT_NONE; 1165 1166 ASSERT_MGD_MTX(ifmgd); 1167 1168 bssid = ifmgd->associated->bssid; 1169 1170 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1171 1172 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1173 sdata->name, bssid, reason_code); 1174 1175 ieee80211_set_disassoc(sdata, true); 1176 ieee80211_recalc_idle(sdata->local); 1177 1178 return RX_MGMT_CFG80211_DEAUTH; 1179 } 1180 1181 1182 static enum rx_mgmt_action __must_check 1183 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1184 struct ieee80211_mgmt *mgmt, size_t len) 1185 { 1186 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1187 u16 reason_code; 1188 1189 if (len < 24 + 2) 1190 return RX_MGMT_NONE; 1191 1192 ASSERT_MGD_MTX(ifmgd); 1193 1194 if (WARN_ON(!ifmgd->associated)) 1195 return RX_MGMT_NONE; 1196 1197 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1198 return RX_MGMT_NONE; 1199 1200 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1201 1202 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1203 sdata->name, mgmt->sa, reason_code); 1204 1205 ieee80211_set_disassoc(sdata, true); 1206 ieee80211_recalc_idle(sdata->local); 1207 return RX_MGMT_CFG80211_DISASSOC; 1208 } 1209 1210 1211 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1212 struct ieee80211_mgmt *mgmt, size_t len) 1213 { 1214 struct ieee80211_sub_if_data *sdata = wk->sdata; 1215 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1216 struct ieee80211_local *local = sdata->local; 1217 struct ieee80211_supported_band *sband; 1218 struct sta_info *sta; 1219 struct cfg80211_bss *cbss = wk->assoc.bss; 1220 u8 *pos; 1221 u32 rates, basic_rates; 1222 u16 capab_info, aid; 1223 struct ieee802_11_elems elems; 1224 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1225 u32 changed = 0; 1226 int i, j, err; 1227 bool have_higher_than_11mbit = false; 1228 u16 ap_ht_cap_flags; 1229 1230 /* AssocResp and ReassocResp have identical structure */ 1231 1232 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1233 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1234 1235 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1236 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1237 "set\n", sdata->name, aid); 1238 aid &= ~(BIT(15) | BIT(14)); 1239 1240 pos = mgmt->u.assoc_resp.variable; 1241 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1242 1243 if (!elems.supp_rates) { 1244 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1245 sdata->name); 1246 return false; 1247 } 1248 1249 ifmgd->aid = aid; 1250 1251 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1252 if (!sta) { 1253 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1254 " the AP\n", sdata->name); 1255 return false; 1256 } 1257 1258 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1259 WLAN_STA_ASSOC_AP); 1260 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1261 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1262 1263 rates = 0; 1264 basic_rates = 0; 1265 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1266 1267 for (i = 0; i < elems.supp_rates_len; i++) { 1268 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1269 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1270 1271 if (rate > 110) 1272 have_higher_than_11mbit = true; 1273 1274 for (j = 0; j < sband->n_bitrates; j++) { 1275 if (sband->bitrates[j].bitrate == rate) { 1276 rates |= BIT(j); 1277 if (is_basic) 1278 basic_rates |= BIT(j); 1279 break; 1280 } 1281 } 1282 } 1283 1284 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1285 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1286 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1287 1288 if (rate > 110) 1289 have_higher_than_11mbit = true; 1290 1291 for (j = 0; j < sband->n_bitrates; j++) { 1292 if (sband->bitrates[j].bitrate == rate) { 1293 rates |= BIT(j); 1294 if (is_basic) 1295 basic_rates |= BIT(j); 1296 break; 1297 } 1298 } 1299 } 1300 1301 sta->sta.supp_rates[local->hw.conf.channel->band] = rates; 1302 sdata->vif.bss_conf.basic_rates = basic_rates; 1303 1304 /* cf. IEEE 802.11 9.2.12 */ 1305 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 1306 have_higher_than_11mbit) 1307 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1308 else 1309 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1310 1311 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1312 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1313 elems.ht_cap_elem, &sta->sta.ht_cap); 1314 1315 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1316 1317 rate_control_rate_init(sta); 1318 1319 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1320 set_sta_flags(sta, WLAN_STA_MFP); 1321 1322 if (elems.wmm_param) 1323 set_sta_flags(sta, WLAN_STA_WME); 1324 1325 err = sta_info_insert(sta); 1326 sta = NULL; 1327 if (err) { 1328 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1329 " the AP (error %d)\n", sdata->name, err); 1330 return false; 1331 } 1332 1333 if (elems.wmm_param) 1334 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1335 elems.wmm_param_len); 1336 else 1337 ieee80211_set_wmm_default(sdata); 1338 1339 local->oper_channel = wk->chan; 1340 1341 if (elems.ht_info_elem && elems.wmm_param && 1342 (sdata->local->hw.queues >= 4) && 1343 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1344 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1345 cbss->bssid, ap_ht_cap_flags); 1346 1347 /* set AID and assoc capability, 1348 * ieee80211_set_associated() will tell the driver */ 1349 bss_conf->aid = aid; 1350 bss_conf->assoc_capability = capab_info; 1351 ieee80211_set_associated(sdata, cbss, changed); 1352 1353 /* 1354 * If we're using 4-addr mode, let the AP know that we're 1355 * doing so, so that it can create the STA VLAN on its side 1356 */ 1357 if (ifmgd->use_4addr) 1358 ieee80211_send_4addr_nullfunc(local, sdata); 1359 1360 /* 1361 * Start timer to probe the connection to the AP now. 1362 * Also start the timer that will detect beacon loss. 1363 */ 1364 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1365 mod_beacon_timer(sdata); 1366 1367 return true; 1368 } 1369 1370 1371 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1372 struct ieee80211_mgmt *mgmt, 1373 size_t len, 1374 struct ieee80211_rx_status *rx_status, 1375 struct ieee802_11_elems *elems, 1376 bool beacon) 1377 { 1378 struct ieee80211_local *local = sdata->local; 1379 int freq; 1380 struct ieee80211_bss *bss; 1381 struct ieee80211_channel *channel; 1382 bool need_ps = false; 1383 1384 if (sdata->u.mgd.associated) { 1385 bss = (void *)sdata->u.mgd.associated->priv; 1386 /* not previously set so we may need to recalc */ 1387 need_ps = !bss->dtim_period; 1388 } 1389 1390 if (elems->ds_params && elems->ds_params_len == 1) 1391 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1392 else 1393 freq = rx_status->freq; 1394 1395 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1396 1397 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1398 return; 1399 1400 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1401 channel, beacon); 1402 if (bss) 1403 ieee80211_rx_bss_put(local, bss); 1404 1405 if (!sdata->u.mgd.associated) 1406 return; 1407 1408 if (need_ps) { 1409 mutex_lock(&local->iflist_mtx); 1410 ieee80211_recalc_ps(local, -1); 1411 mutex_unlock(&local->iflist_mtx); 1412 } 1413 1414 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1415 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1416 ETH_ALEN) == 0)) { 1417 struct ieee80211_channel_sw_ie *sw_elem = 1418 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1419 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1420 bss, rx_status->mactime); 1421 } 1422 } 1423 1424 1425 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1426 struct sk_buff *skb) 1427 { 1428 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1429 struct ieee80211_if_managed *ifmgd; 1430 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1431 size_t baselen, len = skb->len; 1432 struct ieee802_11_elems elems; 1433 1434 ifmgd = &sdata->u.mgd; 1435 1436 ASSERT_MGD_MTX(ifmgd); 1437 1438 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1439 return; /* ignore ProbeResp to foreign address */ 1440 1441 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1442 if (baselen > len) 1443 return; 1444 1445 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1446 &elems); 1447 1448 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1449 1450 if (ifmgd->associated && 1451 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 && 1452 ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1453 IEEE80211_STA_CONNECTION_POLL)) { 1454 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1455 IEEE80211_STA_BEACON_POLL); 1456 mutex_lock(&sdata->local->iflist_mtx); 1457 ieee80211_recalc_ps(sdata->local, -1); 1458 mutex_unlock(&sdata->local->iflist_mtx); 1459 1460 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1461 return; 1462 1463 /* 1464 * We've received a probe response, but are not sure whether 1465 * we have or will be receiving any beacons or data, so let's 1466 * schedule the timers again, just in case. 1467 */ 1468 mod_beacon_timer(sdata); 1469 1470 mod_timer(&ifmgd->conn_mon_timer, 1471 round_jiffies_up(jiffies + 1472 IEEE80211_CONNECTION_IDLE_TIME)); 1473 } 1474 } 1475 1476 /* 1477 * This is the canonical list of information elements we care about, 1478 * the filter code also gives us all changes to the Microsoft OUI 1479 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1480 * 1481 * We implement beacon filtering in software since that means we can 1482 * avoid processing the frame here and in cfg80211, and userspace 1483 * will not be able to tell whether the hardware supports it or not. 1484 * 1485 * XXX: This list needs to be dynamic -- userspace needs to be able to 1486 * add items it requires. It also needs to be able to tell us to 1487 * look out for other vendor IEs. 1488 */ 1489 static const u64 care_about_ies = 1490 (1ULL << WLAN_EID_COUNTRY) | 1491 (1ULL << WLAN_EID_ERP_INFO) | 1492 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1493 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1494 (1ULL << WLAN_EID_HT_CAPABILITY) | 1495 (1ULL << WLAN_EID_HT_INFORMATION); 1496 1497 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1498 struct ieee80211_mgmt *mgmt, 1499 size_t len, 1500 struct ieee80211_rx_status *rx_status) 1501 { 1502 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1503 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1504 size_t baselen; 1505 struct ieee802_11_elems elems; 1506 struct ieee80211_local *local = sdata->local; 1507 u32 changed = 0; 1508 bool erp_valid, directed_tim = false; 1509 u8 erp_value = 0; 1510 u32 ncrc; 1511 u8 *bssid; 1512 1513 ASSERT_MGD_MTX(ifmgd); 1514 1515 /* Process beacon from the current BSS */ 1516 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1517 if (baselen > len) 1518 return; 1519 1520 if (rx_status->freq != local->hw.conf.channel->center_freq) 1521 return; 1522 1523 /* 1524 * We might have received a number of frames, among them a 1525 * disassoc frame and a beacon... 1526 */ 1527 if (!ifmgd->associated) 1528 return; 1529 1530 bssid = ifmgd->associated->bssid; 1531 1532 /* 1533 * And in theory even frames from a different AP we were just 1534 * associated to a split-second ago! 1535 */ 1536 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1537 return; 1538 1539 /* Track average RSSI from the Beacon frames of the current AP */ 1540 ifmgd->last_beacon_signal = rx_status->signal; 1541 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1542 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1543 ifmgd->ave_beacon_signal = rx_status->signal; 1544 ifmgd->last_cqm_event_signal = 0; 1545 } else { 1546 ifmgd->ave_beacon_signal = 1547 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1548 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1549 ifmgd->ave_beacon_signal) / 16; 1550 } 1551 if (bss_conf->cqm_rssi_thold && 1552 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1553 int sig = ifmgd->ave_beacon_signal / 16; 1554 int last_event = ifmgd->last_cqm_event_signal; 1555 int thold = bss_conf->cqm_rssi_thold; 1556 int hyst = bss_conf->cqm_rssi_hyst; 1557 if (sig < thold && 1558 (last_event == 0 || sig < last_event - hyst)) { 1559 ifmgd->last_cqm_event_signal = sig; 1560 ieee80211_cqm_rssi_notify( 1561 &sdata->vif, 1562 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1563 GFP_KERNEL); 1564 } else if (sig > thold && 1565 (last_event == 0 || sig > last_event + hyst)) { 1566 ifmgd->last_cqm_event_signal = sig; 1567 ieee80211_cqm_rssi_notify( 1568 &sdata->vif, 1569 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1570 GFP_KERNEL); 1571 } 1572 } 1573 1574 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1576 if (net_ratelimit()) { 1577 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1578 "to a received beacon\n", sdata->name); 1579 } 1580 #endif 1581 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1582 mutex_lock(&local->iflist_mtx); 1583 ieee80211_recalc_ps(local, -1); 1584 mutex_unlock(&local->iflist_mtx); 1585 } 1586 1587 /* 1588 * Push the beacon loss detection into the future since 1589 * we are processing a beacon from the AP just now. 1590 */ 1591 mod_beacon_timer(sdata); 1592 1593 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1594 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1595 len - baselen, &elems, 1596 care_about_ies, ncrc); 1597 1598 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1599 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1600 ifmgd->aid); 1601 1602 if (ncrc != ifmgd->beacon_crc) { 1603 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1604 true); 1605 1606 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1607 elems.wmm_param_len); 1608 } 1609 1610 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1611 if (directed_tim) { 1612 if (local->hw.conf.dynamic_ps_timeout > 0) { 1613 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1614 ieee80211_hw_config(local, 1615 IEEE80211_CONF_CHANGE_PS); 1616 ieee80211_send_nullfunc(local, sdata, 0); 1617 } else { 1618 local->pspolling = true; 1619 1620 /* 1621 * Here is assumed that the driver will be 1622 * able to send ps-poll frame and receive a 1623 * response even though power save mode is 1624 * enabled, but some drivers might require 1625 * to disable power save here. This needs 1626 * to be investigated. 1627 */ 1628 ieee80211_send_pspoll(local, sdata); 1629 } 1630 } 1631 } 1632 1633 if (ncrc == ifmgd->beacon_crc) 1634 return; 1635 ifmgd->beacon_crc = ncrc; 1636 1637 if (elems.erp_info && elems.erp_info_len >= 1) { 1638 erp_valid = true; 1639 erp_value = elems.erp_info[0]; 1640 } else { 1641 erp_valid = false; 1642 } 1643 changed |= ieee80211_handle_bss_capability(sdata, 1644 le16_to_cpu(mgmt->u.beacon.capab_info), 1645 erp_valid, erp_value); 1646 1647 1648 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1649 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1650 struct sta_info *sta; 1651 struct ieee80211_supported_band *sband; 1652 u16 ap_ht_cap_flags; 1653 1654 rcu_read_lock(); 1655 1656 sta = sta_info_get(sdata, bssid); 1657 if (WARN_ON(!sta)) { 1658 rcu_read_unlock(); 1659 return; 1660 } 1661 1662 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1663 1664 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1665 elems.ht_cap_elem, &sta->sta.ht_cap); 1666 1667 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1668 1669 rcu_read_unlock(); 1670 1671 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1672 bssid, ap_ht_cap_flags); 1673 } 1674 1675 /* Note: country IE parsing is done for us by cfg80211 */ 1676 if (elems.country_elem) { 1677 /* TODO: IBSS also needs this */ 1678 if (elems.pwr_constr_elem) 1679 ieee80211_handle_pwr_constr(sdata, 1680 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1681 elems.pwr_constr_elem, 1682 elems.pwr_constr_elem_len); 1683 } 1684 1685 ieee80211_bss_info_change_notify(sdata, changed); 1686 } 1687 1688 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1689 struct sk_buff *skb) 1690 { 1691 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1692 struct ieee80211_rx_status *rx_status; 1693 struct ieee80211_mgmt *mgmt; 1694 enum rx_mgmt_action rma = RX_MGMT_NONE; 1695 u16 fc; 1696 1697 rx_status = (struct ieee80211_rx_status *) skb->cb; 1698 mgmt = (struct ieee80211_mgmt *) skb->data; 1699 fc = le16_to_cpu(mgmt->frame_control); 1700 1701 mutex_lock(&ifmgd->mtx); 1702 1703 if (ifmgd->associated && 1704 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1705 switch (fc & IEEE80211_FCTL_STYPE) { 1706 case IEEE80211_STYPE_BEACON: 1707 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1708 rx_status); 1709 break; 1710 case IEEE80211_STYPE_PROBE_RESP: 1711 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1712 break; 1713 case IEEE80211_STYPE_DEAUTH: 1714 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1715 break; 1716 case IEEE80211_STYPE_DISASSOC: 1717 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1718 break; 1719 case IEEE80211_STYPE_ACTION: 1720 switch (mgmt->u.action.category) { 1721 case WLAN_CATEGORY_SPECTRUM_MGMT: 1722 ieee80211_sta_process_chanswitch(sdata, 1723 &mgmt->u.action.u.chan_switch.sw_elem, 1724 (void *)ifmgd->associated->priv, 1725 rx_status->mactime); 1726 break; 1727 } 1728 } 1729 mutex_unlock(&ifmgd->mtx); 1730 1731 switch (rma) { 1732 case RX_MGMT_NONE: 1733 /* no action */ 1734 break; 1735 case RX_MGMT_CFG80211_DEAUTH: 1736 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1737 break; 1738 case RX_MGMT_CFG80211_DISASSOC: 1739 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1740 break; 1741 default: 1742 WARN(1, "unexpected: %d", rma); 1743 } 1744 return; 1745 } 1746 1747 mutex_unlock(&ifmgd->mtx); 1748 1749 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1750 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1751 struct ieee80211_local *local = sdata->local; 1752 struct ieee80211_work *wk; 1753 1754 mutex_lock(&local->work_mtx); 1755 list_for_each_entry(wk, &local->work_list, list) { 1756 if (wk->sdata != sdata) 1757 continue; 1758 1759 if (wk->type != IEEE80211_WORK_ASSOC && 1760 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1761 continue; 1762 1763 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1764 continue; 1765 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1766 continue; 1767 1768 /* 1769 * Printing the message only here means we can't 1770 * spuriously print it, but it also means that it 1771 * won't be printed when the frame comes in before 1772 * we even tried to associate or in similar cases. 1773 * 1774 * Ultimately, I suspect cfg80211 should print the 1775 * messages instead. 1776 */ 1777 printk(KERN_DEBUG 1778 "%s: deauthenticated from %pM (Reason: %u)\n", 1779 sdata->name, mgmt->bssid, 1780 le16_to_cpu(mgmt->u.deauth.reason_code)); 1781 1782 list_del_rcu(&wk->list); 1783 free_work(wk); 1784 break; 1785 } 1786 mutex_unlock(&local->work_mtx); 1787 1788 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1789 } 1790 } 1791 1792 static void ieee80211_sta_timer(unsigned long data) 1793 { 1794 struct ieee80211_sub_if_data *sdata = 1795 (struct ieee80211_sub_if_data *) data; 1796 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1797 struct ieee80211_local *local = sdata->local; 1798 1799 if (local->quiescing) { 1800 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1801 return; 1802 } 1803 1804 ieee80211_queue_work(&local->hw, &sdata->work); 1805 } 1806 1807 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 1808 { 1809 struct ieee80211_local *local = sdata->local; 1810 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1811 1812 /* then process the rest of the work */ 1813 mutex_lock(&ifmgd->mtx); 1814 1815 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1816 IEEE80211_STA_CONNECTION_POLL) && 1817 ifmgd->associated) { 1818 u8 bssid[ETH_ALEN]; 1819 1820 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1821 if (time_is_after_jiffies(ifmgd->probe_timeout)) 1822 run_again(ifmgd, ifmgd->probe_timeout); 1823 1824 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) { 1825 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1826 printk(KERN_DEBUG "No probe response from AP %pM" 1827 " after %dms, try %d\n", bssid, 1828 (1000 * IEEE80211_PROBE_WAIT)/HZ, 1829 ifmgd->probe_send_count); 1830 #endif 1831 ieee80211_mgd_probe_ap_send(sdata); 1832 } else { 1833 /* 1834 * We actually lost the connection ... or did we? 1835 * Let's make sure! 1836 */ 1837 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1838 IEEE80211_STA_BEACON_POLL); 1839 printk(KERN_DEBUG "No probe response from AP %pM" 1840 " after %dms, disconnecting.\n", 1841 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ); 1842 ieee80211_set_disassoc(sdata, true); 1843 ieee80211_recalc_idle(local); 1844 mutex_unlock(&ifmgd->mtx); 1845 /* 1846 * must be outside lock due to cfg80211, 1847 * but that's not a problem. 1848 */ 1849 ieee80211_send_deauth_disassoc(sdata, bssid, 1850 IEEE80211_STYPE_DEAUTH, 1851 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1852 NULL, true); 1853 mutex_lock(&ifmgd->mtx); 1854 } 1855 } 1856 1857 mutex_unlock(&ifmgd->mtx); 1858 } 1859 1860 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 1861 { 1862 struct ieee80211_sub_if_data *sdata = 1863 (struct ieee80211_sub_if_data *) data; 1864 struct ieee80211_local *local = sdata->local; 1865 1866 if (local->quiescing) 1867 return; 1868 1869 ieee80211_queue_work(&sdata->local->hw, 1870 &sdata->u.mgd.beacon_connection_loss_work); 1871 } 1872 1873 static void ieee80211_sta_conn_mon_timer(unsigned long data) 1874 { 1875 struct ieee80211_sub_if_data *sdata = 1876 (struct ieee80211_sub_if_data *) data; 1877 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1878 struct ieee80211_local *local = sdata->local; 1879 1880 if (local->quiescing) 1881 return; 1882 1883 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 1884 } 1885 1886 static void ieee80211_sta_monitor_work(struct work_struct *work) 1887 { 1888 struct ieee80211_sub_if_data *sdata = 1889 container_of(work, struct ieee80211_sub_if_data, 1890 u.mgd.monitor_work); 1891 1892 ieee80211_mgd_probe_ap(sdata, false); 1893 } 1894 1895 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 1896 { 1897 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1898 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 1899 IEEE80211_STA_CONNECTION_POLL); 1900 1901 /* let's probe the connection once */ 1902 ieee80211_queue_work(&sdata->local->hw, 1903 &sdata->u.mgd.monitor_work); 1904 /* and do all the other regular work too */ 1905 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1906 } 1907 } 1908 1909 #ifdef CONFIG_PM 1910 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 1911 { 1912 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1913 1914 /* 1915 * we need to use atomic bitops for the running bits 1916 * only because both timers might fire at the same 1917 * time -- the code here is properly synchronised. 1918 */ 1919 1920 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 1921 if (del_timer_sync(&ifmgd->timer)) 1922 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1923 1924 cancel_work_sync(&ifmgd->chswitch_work); 1925 if (del_timer_sync(&ifmgd->chswitch_timer)) 1926 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 1927 1928 cancel_work_sync(&ifmgd->monitor_work); 1929 /* these will just be re-established on connection */ 1930 del_timer_sync(&ifmgd->conn_mon_timer); 1931 del_timer_sync(&ifmgd->bcn_mon_timer); 1932 } 1933 1934 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 1935 { 1936 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1937 1938 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 1939 add_timer(&ifmgd->timer); 1940 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 1941 add_timer(&ifmgd->chswitch_timer); 1942 } 1943 #endif 1944 1945 /* interface setup */ 1946 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 1947 { 1948 struct ieee80211_if_managed *ifmgd; 1949 1950 ifmgd = &sdata->u.mgd; 1951 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 1952 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 1953 INIT_WORK(&ifmgd->beacon_connection_loss_work, 1954 ieee80211_beacon_connection_loss_work); 1955 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 1956 (unsigned long) sdata); 1957 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 1958 (unsigned long) sdata); 1959 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 1960 (unsigned long) sdata); 1961 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 1962 (unsigned long) sdata); 1963 1964 ifmgd->flags = 0; 1965 1966 mutex_init(&ifmgd->mtx); 1967 1968 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 1969 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 1970 else 1971 ifmgd->req_smps = IEEE80211_SMPS_OFF; 1972 } 1973 1974 /* scan finished notification */ 1975 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 1976 { 1977 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 1978 1979 /* Restart STA timers */ 1980 rcu_read_lock(); 1981 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1982 ieee80211_restart_sta_timer(sdata); 1983 rcu_read_unlock(); 1984 } 1985 1986 int ieee80211_max_network_latency(struct notifier_block *nb, 1987 unsigned long data, void *dummy) 1988 { 1989 s32 latency_usec = (s32) data; 1990 struct ieee80211_local *local = 1991 container_of(nb, struct ieee80211_local, 1992 network_latency_notifier); 1993 1994 mutex_lock(&local->iflist_mtx); 1995 ieee80211_recalc_ps(local, latency_usec); 1996 mutex_unlock(&local->iflist_mtx); 1997 1998 return 0; 1999 } 2000 2001 /* config hooks */ 2002 static enum work_done_result 2003 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2004 struct sk_buff *skb) 2005 { 2006 if (!skb) { 2007 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2008 return WORK_DONE_DESTROY; 2009 } 2010 2011 if (wk->type == IEEE80211_WORK_AUTH) { 2012 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2013 return WORK_DONE_DESTROY; 2014 } 2015 2016 mutex_lock(&wk->sdata->u.mgd.mtx); 2017 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2018 mutex_unlock(&wk->sdata->u.mgd.mtx); 2019 2020 wk->type = IEEE80211_WORK_AUTH; 2021 wk->probe_auth.tries = 0; 2022 return WORK_DONE_REQUEUE; 2023 } 2024 2025 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2026 struct cfg80211_auth_request *req) 2027 { 2028 const u8 *ssid; 2029 struct ieee80211_work *wk; 2030 u16 auth_alg; 2031 2032 if (req->local_state_change) 2033 return 0; /* no need to update mac80211 state */ 2034 2035 switch (req->auth_type) { 2036 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2037 auth_alg = WLAN_AUTH_OPEN; 2038 break; 2039 case NL80211_AUTHTYPE_SHARED_KEY: 2040 if (IS_ERR(sdata->local->wep_tx_tfm)) 2041 return -EOPNOTSUPP; 2042 auth_alg = WLAN_AUTH_SHARED_KEY; 2043 break; 2044 case NL80211_AUTHTYPE_FT: 2045 auth_alg = WLAN_AUTH_FT; 2046 break; 2047 case NL80211_AUTHTYPE_NETWORK_EAP: 2048 auth_alg = WLAN_AUTH_LEAP; 2049 break; 2050 default: 2051 return -EOPNOTSUPP; 2052 } 2053 2054 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2055 if (!wk) 2056 return -ENOMEM; 2057 2058 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2059 2060 if (req->ie && req->ie_len) { 2061 memcpy(wk->ie, req->ie, req->ie_len); 2062 wk->ie_len = req->ie_len; 2063 } 2064 2065 if (req->key && req->key_len) { 2066 wk->probe_auth.key_len = req->key_len; 2067 wk->probe_auth.key_idx = req->key_idx; 2068 memcpy(wk->probe_auth.key, req->key, req->key_len); 2069 } 2070 2071 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2072 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2073 wk->probe_auth.ssid_len = ssid[1]; 2074 2075 wk->probe_auth.algorithm = auth_alg; 2076 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2077 2078 /* if we already have a probe, don't probe again */ 2079 if (req->bss->proberesp_ies) 2080 wk->type = IEEE80211_WORK_AUTH; 2081 else 2082 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2083 wk->chan = req->bss->channel; 2084 wk->sdata = sdata; 2085 wk->done = ieee80211_probe_auth_done; 2086 2087 ieee80211_add_work(wk); 2088 return 0; 2089 } 2090 2091 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2092 struct sk_buff *skb) 2093 { 2094 struct ieee80211_mgmt *mgmt; 2095 struct ieee80211_rx_status *rx_status; 2096 struct ieee802_11_elems elems; 2097 u16 status; 2098 2099 if (!skb) { 2100 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2101 return WORK_DONE_DESTROY; 2102 } 2103 2104 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2105 mutex_lock(&wk->sdata->u.mgd.mtx); 2106 rx_status = (void *) skb->cb; 2107 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2108 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2109 &elems, true); 2110 mutex_unlock(&wk->sdata->u.mgd.mtx); 2111 2112 wk->type = IEEE80211_WORK_ASSOC; 2113 /* not really done yet */ 2114 return WORK_DONE_REQUEUE; 2115 } 2116 2117 mgmt = (void *)skb->data; 2118 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2119 2120 if (status == WLAN_STATUS_SUCCESS) { 2121 mutex_lock(&wk->sdata->u.mgd.mtx); 2122 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2123 mutex_unlock(&wk->sdata->u.mgd.mtx); 2124 /* oops -- internal error -- send timeout for now */ 2125 cfg80211_send_assoc_timeout(wk->sdata->dev, 2126 wk->filter_ta); 2127 return WORK_DONE_DESTROY; 2128 } 2129 2130 mutex_unlock(&wk->sdata->u.mgd.mtx); 2131 } 2132 2133 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2134 return WORK_DONE_DESTROY; 2135 } 2136 2137 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2138 struct cfg80211_assoc_request *req) 2139 { 2140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2141 struct ieee80211_bss *bss = (void *)req->bss->priv; 2142 struct ieee80211_work *wk; 2143 const u8 *ssid; 2144 int i; 2145 2146 mutex_lock(&ifmgd->mtx); 2147 if (ifmgd->associated) { 2148 if (!req->prev_bssid || 2149 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2150 ETH_ALEN)) { 2151 /* 2152 * We are already associated and the request was not a 2153 * reassociation request from the current BSS, so 2154 * reject it. 2155 */ 2156 mutex_unlock(&ifmgd->mtx); 2157 return -EALREADY; 2158 } 2159 2160 /* Trying to reassociate - clear previous association state */ 2161 ieee80211_set_disassoc(sdata, true); 2162 } 2163 mutex_unlock(&ifmgd->mtx); 2164 2165 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2166 if (!wk) 2167 return -ENOMEM; 2168 2169 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2170 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2171 2172 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2173 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2174 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2175 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2176 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2177 2178 2179 if (req->ie && req->ie_len) { 2180 memcpy(wk->ie, req->ie, req->ie_len); 2181 wk->ie_len = req->ie_len; 2182 } else 2183 wk->ie_len = 0; 2184 2185 wk->assoc.bss = req->bss; 2186 2187 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2188 2189 /* new association always uses requested smps mode */ 2190 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2191 if (ifmgd->powersave) 2192 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2193 else 2194 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2195 } else 2196 ifmgd->ap_smps = ifmgd->req_smps; 2197 2198 wk->assoc.smps = ifmgd->ap_smps; 2199 /* 2200 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2201 * We still associate in non-HT mode (11a/b/g) if any one of these 2202 * ciphers is configured as pairwise. 2203 * We can set this to true for non-11n hardware, that'll be checked 2204 * separately along with the peer capabilities. 2205 */ 2206 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2207 wk->assoc.capability = req->bss->capability; 2208 wk->assoc.wmm_used = bss->wmm_used; 2209 wk->assoc.supp_rates = bss->supp_rates; 2210 wk->assoc.supp_rates_len = bss->supp_rates_len; 2211 wk->assoc.ht_information_ie = 2212 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2213 2214 if (bss->wmm_used && bss->uapsd_supported && 2215 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2216 wk->assoc.uapsd_used = true; 2217 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2218 } else { 2219 wk->assoc.uapsd_used = false; 2220 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2221 } 2222 2223 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2224 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2225 wk->assoc.ssid_len = ssid[1]; 2226 2227 if (req->prev_bssid) 2228 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2229 2230 wk->chan = req->bss->channel; 2231 wk->sdata = sdata; 2232 wk->done = ieee80211_assoc_done; 2233 if (!bss->dtim_period && 2234 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2235 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2236 else 2237 wk->type = IEEE80211_WORK_ASSOC; 2238 2239 if (req->use_mfp) { 2240 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2241 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2242 } else { 2243 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2244 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2245 } 2246 2247 if (req->crypto.control_port) 2248 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2249 else 2250 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2251 2252 ieee80211_add_work(wk); 2253 return 0; 2254 } 2255 2256 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2257 struct cfg80211_deauth_request *req, 2258 void *cookie) 2259 { 2260 struct ieee80211_local *local = sdata->local; 2261 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2262 struct ieee80211_work *wk; 2263 u8 bssid[ETH_ALEN]; 2264 bool assoc_bss = false; 2265 2266 mutex_lock(&ifmgd->mtx); 2267 2268 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2269 if (ifmgd->associated == req->bss) { 2270 ieee80211_set_disassoc(sdata, false); 2271 mutex_unlock(&ifmgd->mtx); 2272 assoc_bss = true; 2273 } else { 2274 bool not_auth_yet = false; 2275 2276 mutex_unlock(&ifmgd->mtx); 2277 2278 mutex_lock(&local->work_mtx); 2279 list_for_each_entry(wk, &local->work_list, list) { 2280 if (wk->sdata != sdata) 2281 continue; 2282 2283 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2284 wk->type != IEEE80211_WORK_AUTH && 2285 wk->type != IEEE80211_WORK_ASSOC && 2286 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2287 continue; 2288 2289 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2290 continue; 2291 2292 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2293 list_del_rcu(&wk->list); 2294 free_work(wk); 2295 break; 2296 } 2297 mutex_unlock(&local->work_mtx); 2298 2299 /* 2300 * If somebody requests authentication and we haven't 2301 * sent out an auth frame yet there's no need to send 2302 * out a deauth frame either. If the state was PROBE, 2303 * then this is the case. If it's AUTH we have sent a 2304 * frame, and if it's IDLE we have completed the auth 2305 * process already. 2306 */ 2307 if (not_auth_yet) { 2308 __cfg80211_auth_canceled(sdata->dev, bssid); 2309 return 0; 2310 } 2311 } 2312 2313 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2314 sdata->name, bssid, req->reason_code); 2315 2316 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2317 req->reason_code, cookie, 2318 !req->local_state_change); 2319 if (assoc_bss) 2320 sta_info_destroy_addr(sdata, bssid); 2321 2322 ieee80211_recalc_idle(sdata->local); 2323 2324 return 0; 2325 } 2326 2327 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2328 struct cfg80211_disassoc_request *req, 2329 void *cookie) 2330 { 2331 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2332 u8 bssid[ETH_ALEN]; 2333 2334 mutex_lock(&ifmgd->mtx); 2335 2336 /* 2337 * cfg80211 should catch this ... but it's racy since 2338 * we can receive a disassoc frame, process it, hand it 2339 * to cfg80211 while that's in a locked section already 2340 * trying to tell us that the user wants to disconnect. 2341 */ 2342 if (ifmgd->associated != req->bss) { 2343 mutex_unlock(&ifmgd->mtx); 2344 return -ENOLINK; 2345 } 2346 2347 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2348 sdata->name, req->bss->bssid, req->reason_code); 2349 2350 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2351 ieee80211_set_disassoc(sdata, false); 2352 2353 mutex_unlock(&ifmgd->mtx); 2354 2355 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2356 IEEE80211_STYPE_DISASSOC, req->reason_code, 2357 cookie, !req->local_state_change); 2358 sta_info_destroy_addr(sdata, bssid); 2359 2360 ieee80211_recalc_idle(sdata->local); 2361 2362 return 0; 2363 } 2364 2365 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2366 enum nl80211_cqm_rssi_threshold_event rssi_event, 2367 gfp_t gfp) 2368 { 2369 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2370 2371 trace_api_cqm_rssi_notify(sdata, rssi_event); 2372 2373 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2374 } 2375 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2376