1 /* 2 * BSS client mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/pm_qos_params.h> 21 #include <linux/crc32.h> 22 #include <linux/slab.h> 23 #include <net/mac80211.h> 24 #include <asm/unaligned.h> 25 26 #include "ieee80211_i.h" 27 #include "driver-ops.h" 28 #include "rate.h" 29 #include "led.h" 30 31 static int max_nullfunc_tries = 2; 32 module_param(max_nullfunc_tries, int, 0644); 33 MODULE_PARM_DESC(max_nullfunc_tries, 34 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 35 36 static int max_probe_tries = 5; 37 module_param(max_probe_tries, int, 0644); 38 MODULE_PARM_DESC(max_probe_tries, 39 "Maximum probe tries before disconnecting (reason 4)."); 40 41 /* 42 * Beacon loss timeout is calculated as N frames times the 43 * advertised beacon interval. This may need to be somewhat 44 * higher than what hardware might detect to account for 45 * delays in the host processing frames. But since we also 46 * probe on beacon miss before declaring the connection lost 47 * default to what we want. 48 */ 49 #define IEEE80211_BEACON_LOSS_COUNT 7 50 51 /* 52 * Time the connection can be idle before we probe 53 * it to see if we can still talk to the AP. 54 */ 55 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 56 /* 57 * Time we wait for a probe response after sending 58 * a probe request because of beacon loss or for 59 * checking the connection still works. 60 */ 61 static int probe_wait_ms = 500; 62 module_param(probe_wait_ms, int, 0644); 63 MODULE_PARM_DESC(probe_wait_ms, 64 "Maximum time(ms) to wait for probe response" 65 " before disconnecting (reason 4)."); 66 67 /* 68 * Weight given to the latest Beacon frame when calculating average signal 69 * strength for Beacon frames received in the current BSS. This must be 70 * between 1 and 15. 71 */ 72 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 73 74 /* 75 * How many Beacon frames need to have been used in average signal strength 76 * before starting to indicate signal change events. 77 */ 78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 79 80 #define TMR_RUNNING_TIMER 0 81 #define TMR_RUNNING_CHANSW 1 82 83 /* 84 * All cfg80211 functions have to be called outside a locked 85 * section so that they can acquire a lock themselves... This 86 * is much simpler than queuing up things in cfg80211, but we 87 * do need some indirection for that here. 88 */ 89 enum rx_mgmt_action { 90 /* no action required */ 91 RX_MGMT_NONE, 92 93 /* caller must call cfg80211_send_rx_auth() */ 94 RX_MGMT_CFG80211_AUTH, 95 96 /* caller must call cfg80211_send_rx_assoc() */ 97 RX_MGMT_CFG80211_ASSOC, 98 99 /* caller must call cfg80211_send_deauth() */ 100 RX_MGMT_CFG80211_DEAUTH, 101 102 /* caller must call cfg80211_send_disassoc() */ 103 RX_MGMT_CFG80211_DISASSOC, 104 105 /* caller must tell cfg80211 about internal error */ 106 RX_MGMT_CFG80211_ASSOC_ERROR, 107 }; 108 109 /* utils */ 110 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 111 { 112 lockdep_assert_held(&ifmgd->mtx); 113 } 114 115 /* 116 * We can have multiple work items (and connection probing) 117 * scheduling this timer, but we need to take care to only 118 * reschedule it when it should fire _earlier_ than it was 119 * asked for before, or if it's not pending right now. This 120 * function ensures that. Note that it then is required to 121 * run this function for all timeouts after the first one 122 * has happened -- the work that runs from this timer will 123 * do that. 124 */ 125 static void run_again(struct ieee80211_if_managed *ifmgd, 126 unsigned long timeout) 127 { 128 ASSERT_MGD_MTX(ifmgd); 129 130 if (!timer_pending(&ifmgd->timer) || 131 time_before(timeout, ifmgd->timer.expires)) 132 mod_timer(&ifmgd->timer, timeout); 133 } 134 135 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 136 { 137 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 138 return; 139 140 mod_timer(&sdata->u.mgd.bcn_mon_timer, 141 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 142 } 143 144 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 145 { 146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 147 148 if (unlikely(!sdata->u.mgd.associated)) 149 return; 150 151 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 152 return; 153 154 mod_timer(&sdata->u.mgd.conn_mon_timer, 155 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 156 157 ifmgd->probe_send_count = 0; 158 } 159 160 static int ecw2cw(int ecw) 161 { 162 return (1 << ecw) - 1; 163 } 164 165 /* 166 * ieee80211_enable_ht should be called only after the operating band 167 * has been determined as ht configuration depends on the hw's 168 * HT abilities for a specific band. 169 */ 170 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 171 struct ieee80211_ht_info *hti, 172 const u8 *bssid, u16 ap_ht_cap_flags) 173 { 174 struct ieee80211_local *local = sdata->local; 175 struct ieee80211_supported_band *sband; 176 struct sta_info *sta; 177 u32 changed = 0; 178 int hti_cfreq; 179 u16 ht_opmode; 180 bool enable_ht = true; 181 enum nl80211_channel_type prev_chantype; 182 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 183 184 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 185 186 prev_chantype = sdata->vif.bss_conf.channel_type; 187 188 /* HT is not supported */ 189 if (!sband->ht_cap.ht_supported) 190 enable_ht = false; 191 192 if (enable_ht) { 193 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan, 194 sband->band); 195 /* check that channel matches the right operating channel */ 196 if (local->hw.conf.channel->center_freq != hti_cfreq) { 197 /* Some APs mess this up, evidently. 198 * Netgear WNDR3700 sometimes reports 4 higher than 199 * the actual channel, for instance. 200 */ 201 printk(KERN_DEBUG 202 "%s: Wrong control channel in association" 203 " response: configured center-freq: %d" 204 " hti-cfreq: %d hti->control_chan: %d" 205 " band: %d. Disabling HT.\n", 206 sdata->name, 207 local->hw.conf.channel->center_freq, 208 hti_cfreq, hti->control_chan, 209 sband->band); 210 enable_ht = false; 211 } 212 } 213 214 if (enable_ht) { 215 channel_type = NL80211_CHAN_HT20; 216 217 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 218 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 219 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 220 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 221 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 222 if (!(local->hw.conf.channel->flags & 223 IEEE80211_CHAN_NO_HT40PLUS)) 224 channel_type = NL80211_CHAN_HT40PLUS; 225 break; 226 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 227 if (!(local->hw.conf.channel->flags & 228 IEEE80211_CHAN_NO_HT40MINUS)) 229 channel_type = NL80211_CHAN_HT40MINUS; 230 break; 231 } 232 } 233 } 234 235 if (local->tmp_channel) 236 local->tmp_channel_type = channel_type; 237 238 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 239 /* can only fail due to HT40+/- mismatch */ 240 channel_type = NL80211_CHAN_HT20; 241 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 242 } 243 244 /* channel_type change automatically detected */ 245 ieee80211_hw_config(local, 0); 246 247 if (prev_chantype != channel_type) { 248 rcu_read_lock(); 249 sta = sta_info_get(sdata, bssid); 250 if (sta) 251 rate_control_rate_update(local, sband, sta, 252 IEEE80211_RC_HT_CHANGED, 253 channel_type); 254 rcu_read_unlock(); 255 } 256 257 ht_opmode = le16_to_cpu(hti->operation_mode); 258 259 /* if bss configuration changed store the new one */ 260 if (sdata->ht_opmode_valid != enable_ht || 261 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 262 prev_chantype != channel_type) { 263 changed |= BSS_CHANGED_HT; 264 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 265 sdata->ht_opmode_valid = enable_ht; 266 } 267 268 return changed; 269 } 270 271 /* frame sending functions */ 272 273 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 274 const u8 *bssid, u16 stype, u16 reason, 275 void *cookie, bool send_frame) 276 { 277 struct ieee80211_local *local = sdata->local; 278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 279 struct sk_buff *skb; 280 struct ieee80211_mgmt *mgmt; 281 282 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 283 if (!skb) { 284 printk(KERN_DEBUG "%s: failed to allocate buffer for " 285 "deauth/disassoc frame\n", sdata->name); 286 return; 287 } 288 skb_reserve(skb, local->hw.extra_tx_headroom); 289 290 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 291 memset(mgmt, 0, 24); 292 memcpy(mgmt->da, bssid, ETH_ALEN); 293 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 294 memcpy(mgmt->bssid, bssid, ETH_ALEN); 295 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 296 skb_put(skb, 2); 297 /* u.deauth.reason_code == u.disassoc.reason_code */ 298 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 299 300 if (stype == IEEE80211_STYPE_DEAUTH) 301 if (cookie) 302 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 303 else 304 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 305 else 306 if (cookie) 307 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 308 else 309 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 310 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 311 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 312 313 if (send_frame) 314 ieee80211_tx_skb(sdata, skb); 315 else 316 kfree_skb(skb); 317 } 318 319 void ieee80211_send_pspoll(struct ieee80211_local *local, 320 struct ieee80211_sub_if_data *sdata) 321 { 322 struct ieee80211_pspoll *pspoll; 323 struct sk_buff *skb; 324 325 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 326 if (!skb) 327 return; 328 329 pspoll = (struct ieee80211_pspoll *) skb->data; 330 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 331 332 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 333 ieee80211_tx_skb(sdata, skb); 334 } 335 336 void ieee80211_send_nullfunc(struct ieee80211_local *local, 337 struct ieee80211_sub_if_data *sdata, 338 int powersave) 339 { 340 struct sk_buff *skb; 341 struct ieee80211_hdr_3addr *nullfunc; 342 343 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 344 if (!skb) 345 return; 346 347 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 348 if (powersave) 349 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 350 351 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 352 ieee80211_tx_skb(sdata, skb); 353 } 354 355 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 356 struct ieee80211_sub_if_data *sdata) 357 { 358 struct sk_buff *skb; 359 struct ieee80211_hdr *nullfunc; 360 __le16 fc; 361 362 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 363 return; 364 365 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 366 if (!skb) { 367 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " 368 "nullfunc frame\n", sdata->name); 369 return; 370 } 371 skb_reserve(skb, local->hw.extra_tx_headroom); 372 373 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 374 memset(nullfunc, 0, 30); 375 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 376 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 377 nullfunc->frame_control = fc; 378 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 379 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 380 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 381 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 382 383 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 384 ieee80211_tx_skb(sdata, skb); 385 } 386 387 /* spectrum management related things */ 388 static void ieee80211_chswitch_work(struct work_struct *work) 389 { 390 struct ieee80211_sub_if_data *sdata = 391 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 392 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 393 394 if (!ieee80211_sdata_running(sdata)) 395 return; 396 397 mutex_lock(&ifmgd->mtx); 398 if (!ifmgd->associated) 399 goto out; 400 401 sdata->local->oper_channel = sdata->local->csa_channel; 402 if (!sdata->local->ops->channel_switch) { 403 /* call "hw_config" only if doing sw channel switch */ 404 ieee80211_hw_config(sdata->local, 405 IEEE80211_CONF_CHANGE_CHANNEL); 406 } 407 408 /* XXX: shouldn't really modify cfg80211-owned data! */ 409 ifmgd->associated->channel = sdata->local->oper_channel; 410 411 ieee80211_wake_queues_by_reason(&sdata->local->hw, 412 IEEE80211_QUEUE_STOP_REASON_CSA); 413 out: 414 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 415 mutex_unlock(&ifmgd->mtx); 416 } 417 418 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 419 { 420 struct ieee80211_sub_if_data *sdata; 421 struct ieee80211_if_managed *ifmgd; 422 423 sdata = vif_to_sdata(vif); 424 ifmgd = &sdata->u.mgd; 425 426 trace_api_chswitch_done(sdata, success); 427 if (!success) { 428 /* 429 * If the channel switch was not successful, stay 430 * around on the old channel. We currently lack 431 * good handling of this situation, possibly we 432 * should just drop the association. 433 */ 434 sdata->local->csa_channel = sdata->local->oper_channel; 435 } 436 437 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 438 } 439 EXPORT_SYMBOL(ieee80211_chswitch_done); 440 441 static void ieee80211_chswitch_timer(unsigned long data) 442 { 443 struct ieee80211_sub_if_data *sdata = 444 (struct ieee80211_sub_if_data *) data; 445 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 446 447 if (sdata->local->quiescing) { 448 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 449 return; 450 } 451 452 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 453 } 454 455 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 456 struct ieee80211_channel_sw_ie *sw_elem, 457 struct ieee80211_bss *bss, 458 u64 timestamp) 459 { 460 struct cfg80211_bss *cbss = 461 container_of((void *)bss, struct cfg80211_bss, priv); 462 struct ieee80211_channel *new_ch; 463 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 464 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 465 cbss->channel->band); 466 467 ASSERT_MGD_MTX(ifmgd); 468 469 if (!ifmgd->associated) 470 return; 471 472 if (sdata->local->scanning) 473 return; 474 475 /* Disregard subsequent beacons if we are already running a timer 476 processing a CSA */ 477 478 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 479 return; 480 481 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 482 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 483 return; 484 485 sdata->local->csa_channel = new_ch; 486 487 if (sdata->local->ops->channel_switch) { 488 /* use driver's channel switch callback */ 489 struct ieee80211_channel_switch ch_switch; 490 memset(&ch_switch, 0, sizeof(ch_switch)); 491 ch_switch.timestamp = timestamp; 492 if (sw_elem->mode) { 493 ch_switch.block_tx = true; 494 ieee80211_stop_queues_by_reason(&sdata->local->hw, 495 IEEE80211_QUEUE_STOP_REASON_CSA); 496 } 497 ch_switch.channel = new_ch; 498 ch_switch.count = sw_elem->count; 499 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 500 drv_channel_switch(sdata->local, &ch_switch); 501 return; 502 } 503 504 /* channel switch handled in software */ 505 if (sw_elem->count <= 1) { 506 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 507 } else { 508 if (sw_elem->mode) 509 ieee80211_stop_queues_by_reason(&sdata->local->hw, 510 IEEE80211_QUEUE_STOP_REASON_CSA); 511 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 512 mod_timer(&ifmgd->chswitch_timer, 513 jiffies + 514 msecs_to_jiffies(sw_elem->count * 515 cbss->beacon_interval)); 516 } 517 } 518 519 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 520 u16 capab_info, u8 *pwr_constr_elem, 521 u8 pwr_constr_elem_len) 522 { 523 struct ieee80211_conf *conf = &sdata->local->hw.conf; 524 525 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 526 return; 527 528 /* Power constraint IE length should be 1 octet */ 529 if (pwr_constr_elem_len != 1) 530 return; 531 532 if ((*pwr_constr_elem <= conf->channel->max_power) && 533 (*pwr_constr_elem != sdata->local->power_constr_level)) { 534 sdata->local->power_constr_level = *pwr_constr_elem; 535 ieee80211_hw_config(sdata->local, 0); 536 } 537 } 538 539 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 540 { 541 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 542 struct ieee80211_local *local = sdata->local; 543 struct ieee80211_conf *conf = &local->hw.conf; 544 545 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 546 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 547 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 548 549 local->disable_dynamic_ps = false; 550 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 551 } 552 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 553 554 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 555 { 556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 557 struct ieee80211_local *local = sdata->local; 558 struct ieee80211_conf *conf = &local->hw.conf; 559 560 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 561 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 562 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 563 564 local->disable_dynamic_ps = true; 565 conf->dynamic_ps_timeout = 0; 566 del_timer_sync(&local->dynamic_ps_timer); 567 ieee80211_queue_work(&local->hw, 568 &local->dynamic_ps_enable_work); 569 } 570 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 571 572 /* powersave */ 573 static void ieee80211_enable_ps(struct ieee80211_local *local, 574 struct ieee80211_sub_if_data *sdata) 575 { 576 struct ieee80211_conf *conf = &local->hw.conf; 577 578 /* 579 * If we are scanning right now then the parameters will 580 * take effect when scan finishes. 581 */ 582 if (local->scanning) 583 return; 584 585 if (conf->dynamic_ps_timeout > 0 && 586 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 587 mod_timer(&local->dynamic_ps_timer, jiffies + 588 msecs_to_jiffies(conf->dynamic_ps_timeout)); 589 } else { 590 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 591 ieee80211_send_nullfunc(local, sdata, 1); 592 593 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 594 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 595 return; 596 597 conf->flags |= IEEE80211_CONF_PS; 598 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 599 } 600 } 601 602 static void ieee80211_change_ps(struct ieee80211_local *local) 603 { 604 struct ieee80211_conf *conf = &local->hw.conf; 605 606 if (local->ps_sdata) { 607 ieee80211_enable_ps(local, local->ps_sdata); 608 } else if (conf->flags & IEEE80211_CONF_PS) { 609 conf->flags &= ~IEEE80211_CONF_PS; 610 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 611 del_timer_sync(&local->dynamic_ps_timer); 612 cancel_work_sync(&local->dynamic_ps_enable_work); 613 } 614 } 615 616 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 617 { 618 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 619 struct sta_info *sta = NULL; 620 u32 sta_flags = 0; 621 622 if (!mgd->powersave) 623 return false; 624 625 if (!mgd->associated) 626 return false; 627 628 if (!mgd->associated->beacon_ies) 629 return false; 630 631 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 632 IEEE80211_STA_CONNECTION_POLL)) 633 return false; 634 635 rcu_read_lock(); 636 sta = sta_info_get(sdata, mgd->bssid); 637 if (sta) 638 sta_flags = get_sta_flags(sta); 639 rcu_read_unlock(); 640 641 if (!(sta_flags & WLAN_STA_AUTHORIZED)) 642 return false; 643 644 return true; 645 } 646 647 /* need to hold RTNL or interface lock */ 648 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 649 { 650 struct ieee80211_sub_if_data *sdata, *found = NULL; 651 int count = 0; 652 int timeout; 653 654 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 655 local->ps_sdata = NULL; 656 return; 657 } 658 659 if (!list_empty(&local->work_list)) { 660 local->ps_sdata = NULL; 661 goto change; 662 } 663 664 list_for_each_entry(sdata, &local->interfaces, list) { 665 if (!ieee80211_sdata_running(sdata)) 666 continue; 667 if (sdata->vif.type == NL80211_IFTYPE_AP) { 668 /* If an AP vif is found, then disable PS 669 * by setting the count to zero thereby setting 670 * ps_sdata to NULL. 671 */ 672 count = 0; 673 break; 674 } 675 if (sdata->vif.type != NL80211_IFTYPE_STATION) 676 continue; 677 found = sdata; 678 count++; 679 } 680 681 if (count == 1 && ieee80211_powersave_allowed(found)) { 682 struct ieee80211_conf *conf = &local->hw.conf; 683 s32 beaconint_us; 684 685 if (latency < 0) 686 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 687 688 beaconint_us = ieee80211_tu_to_usec( 689 found->vif.bss_conf.beacon_int); 690 691 timeout = local->dynamic_ps_forced_timeout; 692 if (timeout < 0) { 693 /* 694 * Go to full PSM if the user configures a very low 695 * latency requirement. 696 * The 2000 second value is there for compatibility 697 * until the PM_QOS_NETWORK_LATENCY is configured 698 * with real values. 699 */ 700 if (latency > (1900 * USEC_PER_MSEC) && 701 latency != (2000 * USEC_PER_SEC)) 702 timeout = 0; 703 else 704 timeout = 100; 705 } 706 local->dynamic_ps_user_timeout = timeout; 707 if (!local->disable_dynamic_ps) 708 conf->dynamic_ps_timeout = 709 local->dynamic_ps_user_timeout; 710 711 if (beaconint_us > latency) { 712 local->ps_sdata = NULL; 713 } else { 714 struct ieee80211_bss *bss; 715 int maxslp = 1; 716 u8 dtimper; 717 718 bss = (void *)found->u.mgd.associated->priv; 719 dtimper = bss->dtim_period; 720 721 /* If the TIM IE is invalid, pretend the value is 1 */ 722 if (!dtimper) 723 dtimper = 1; 724 else if (dtimper > 1) 725 maxslp = min_t(int, dtimper, 726 latency / beaconint_us); 727 728 local->hw.conf.max_sleep_period = maxslp; 729 local->hw.conf.ps_dtim_period = dtimper; 730 local->ps_sdata = found; 731 } 732 } else { 733 local->ps_sdata = NULL; 734 } 735 736 change: 737 ieee80211_change_ps(local); 738 } 739 740 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 741 { 742 struct ieee80211_local *local = 743 container_of(work, struct ieee80211_local, 744 dynamic_ps_disable_work); 745 746 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 747 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 748 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 749 } 750 751 ieee80211_wake_queues_by_reason(&local->hw, 752 IEEE80211_QUEUE_STOP_REASON_PS); 753 } 754 755 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 756 { 757 struct ieee80211_local *local = 758 container_of(work, struct ieee80211_local, 759 dynamic_ps_enable_work); 760 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 761 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 762 763 /* can only happen when PS was just disabled anyway */ 764 if (!sdata) 765 return; 766 767 if (local->hw.conf.flags & IEEE80211_CONF_PS) 768 return; 769 770 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 771 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 772 netif_tx_stop_all_queues(sdata->dev); 773 /* 774 * Flush all the frames queued in the driver before 775 * going to power save 776 */ 777 drv_flush(local, false); 778 ieee80211_send_nullfunc(local, sdata, 1); 779 780 /* Flush once again to get the tx status of nullfunc frame */ 781 drv_flush(local, false); 782 } 783 784 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 785 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 786 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 787 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 788 local->hw.conf.flags |= IEEE80211_CONF_PS; 789 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 790 } 791 792 netif_tx_start_all_queues(sdata->dev); 793 } 794 795 void ieee80211_dynamic_ps_timer(unsigned long data) 796 { 797 struct ieee80211_local *local = (void *) data; 798 799 if (local->quiescing || local->suspended) 800 return; 801 802 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 803 } 804 805 /* MLME */ 806 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 807 struct ieee80211_sub_if_data *sdata, 808 u8 *wmm_param, size_t wmm_param_len) 809 { 810 struct ieee80211_tx_queue_params params; 811 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 812 size_t left; 813 int count; 814 u8 *pos, uapsd_queues = 0; 815 816 if (!local->ops->conf_tx) 817 return; 818 819 if (local->hw.queues < 4) 820 return; 821 822 if (!wmm_param) 823 return; 824 825 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 826 return; 827 828 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 829 uapsd_queues = local->uapsd_queues; 830 831 count = wmm_param[6] & 0x0f; 832 if (count == ifmgd->wmm_last_param_set) 833 return; 834 ifmgd->wmm_last_param_set = count; 835 836 pos = wmm_param + 8; 837 left = wmm_param_len - 8; 838 839 memset(¶ms, 0, sizeof(params)); 840 841 local->wmm_acm = 0; 842 for (; left >= 4; left -= 4, pos += 4) { 843 int aci = (pos[0] >> 5) & 0x03; 844 int acm = (pos[0] >> 4) & 0x01; 845 bool uapsd = false; 846 int queue; 847 848 switch (aci) { 849 case 1: /* AC_BK */ 850 queue = 3; 851 if (acm) 852 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 853 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 854 uapsd = true; 855 break; 856 case 2: /* AC_VI */ 857 queue = 1; 858 if (acm) 859 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 860 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 861 uapsd = true; 862 break; 863 case 3: /* AC_VO */ 864 queue = 0; 865 if (acm) 866 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 867 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 868 uapsd = true; 869 break; 870 case 0: /* AC_BE */ 871 default: 872 queue = 2; 873 if (acm) 874 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 875 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 876 uapsd = true; 877 break; 878 } 879 880 params.aifs = pos[0] & 0x0f; 881 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 882 params.cw_min = ecw2cw(pos[1] & 0x0f); 883 params.txop = get_unaligned_le16(pos + 2); 884 params.uapsd = uapsd; 885 886 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 887 wiphy_debug(local->hw.wiphy, 888 "WMM queue=%d aci=%d acm=%d aifs=%d " 889 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 890 queue, aci, acm, 891 params.aifs, params.cw_min, params.cw_max, 892 params.txop, params.uapsd); 893 #endif 894 if (drv_conf_tx(local, queue, ¶ms)) 895 wiphy_debug(local->hw.wiphy, 896 "failed to set TX queue parameters for queue %d\n", 897 queue); 898 } 899 900 /* enable WMM or activate new settings */ 901 sdata->vif.bss_conf.qos = true; 902 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 903 } 904 905 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 906 u16 capab, bool erp_valid, u8 erp) 907 { 908 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 909 u32 changed = 0; 910 bool use_protection; 911 bool use_short_preamble; 912 bool use_short_slot; 913 914 if (erp_valid) { 915 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 916 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 917 } else { 918 use_protection = false; 919 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 920 } 921 922 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 923 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 924 use_short_slot = true; 925 926 if (use_protection != bss_conf->use_cts_prot) { 927 bss_conf->use_cts_prot = use_protection; 928 changed |= BSS_CHANGED_ERP_CTS_PROT; 929 } 930 931 if (use_short_preamble != bss_conf->use_short_preamble) { 932 bss_conf->use_short_preamble = use_short_preamble; 933 changed |= BSS_CHANGED_ERP_PREAMBLE; 934 } 935 936 if (use_short_slot != bss_conf->use_short_slot) { 937 bss_conf->use_short_slot = use_short_slot; 938 changed |= BSS_CHANGED_ERP_SLOT; 939 } 940 941 return changed; 942 } 943 944 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 945 struct cfg80211_bss *cbss, 946 u32 bss_info_changed) 947 { 948 struct ieee80211_bss *bss = (void *)cbss->priv; 949 struct ieee80211_local *local = sdata->local; 950 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 951 952 bss_info_changed |= BSS_CHANGED_ASSOC; 953 /* set timing information */ 954 bss_conf->beacon_int = cbss->beacon_interval; 955 bss_conf->timestamp = cbss->tsf; 956 957 bss_info_changed |= BSS_CHANGED_BEACON_INT; 958 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 959 cbss->capability, bss->has_erp_value, bss->erp_value); 960 961 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 962 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 963 964 sdata->u.mgd.associated = cbss; 965 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 966 967 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 968 969 /* just to be sure */ 970 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 971 IEEE80211_STA_BEACON_POLL); 972 973 ieee80211_led_assoc(local, 1); 974 975 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 976 bss_conf->dtim_period = bss->dtim_period; 977 else 978 bss_conf->dtim_period = 0; 979 980 bss_conf->assoc = 1; 981 /* 982 * For now just always ask the driver to update the basic rateset 983 * when we have associated, we aren't checking whether it actually 984 * changed or not. 985 */ 986 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 987 988 /* And the BSSID changed - we're associated now */ 989 bss_info_changed |= BSS_CHANGED_BSSID; 990 991 /* Tell the driver to monitor connection quality (if supported) */ 992 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 993 bss_conf->cqm_rssi_thold) 994 bss_info_changed |= BSS_CHANGED_CQM; 995 996 /* Enable ARP filtering */ 997 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 998 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 999 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1000 } 1001 1002 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1003 1004 mutex_lock(&local->iflist_mtx); 1005 ieee80211_recalc_ps(local, -1); 1006 ieee80211_recalc_smps(local); 1007 mutex_unlock(&local->iflist_mtx); 1008 1009 netif_tx_start_all_queues(sdata->dev); 1010 netif_carrier_on(sdata->dev); 1011 } 1012 1013 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1014 bool remove_sta, bool tx) 1015 { 1016 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1017 struct ieee80211_local *local = sdata->local; 1018 struct sta_info *sta; 1019 u32 changed = 0, config_changed = 0; 1020 u8 bssid[ETH_ALEN]; 1021 1022 ASSERT_MGD_MTX(ifmgd); 1023 1024 if (WARN_ON(!ifmgd->associated)) 1025 return; 1026 1027 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1028 1029 ifmgd->associated = NULL; 1030 memset(ifmgd->bssid, 0, ETH_ALEN); 1031 1032 /* 1033 * we need to commit the associated = NULL change because the 1034 * scan code uses that to determine whether this iface should 1035 * go to/wake up from powersave or not -- and could otherwise 1036 * wake the queues erroneously. 1037 */ 1038 smp_mb(); 1039 1040 /* 1041 * Thus, we can only afterwards stop the queues -- to account 1042 * for the case where another CPU is finishing a scan at this 1043 * time -- we don't want the scan code to enable queues. 1044 */ 1045 1046 netif_tx_stop_all_queues(sdata->dev); 1047 netif_carrier_off(sdata->dev); 1048 1049 mutex_lock(&local->sta_mtx); 1050 sta = sta_info_get(sdata, bssid); 1051 if (sta) { 1052 set_sta_flags(sta, WLAN_STA_BLOCK_BA); 1053 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1054 } 1055 mutex_unlock(&local->sta_mtx); 1056 1057 changed |= ieee80211_reset_erp_info(sdata); 1058 1059 ieee80211_led_assoc(local, 0); 1060 changed |= BSS_CHANGED_ASSOC; 1061 sdata->vif.bss_conf.assoc = false; 1062 1063 ieee80211_set_wmm_default(sdata); 1064 1065 /* channel(_type) changes are handled by ieee80211_hw_config */ 1066 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1067 1068 /* on the next assoc, re-program HT parameters */ 1069 sdata->ht_opmode_valid = false; 1070 1071 local->power_constr_level = 0; 1072 1073 del_timer_sync(&local->dynamic_ps_timer); 1074 cancel_work_sync(&local->dynamic_ps_enable_work); 1075 1076 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1077 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1078 config_changed |= IEEE80211_CONF_CHANGE_PS; 1079 } 1080 1081 ieee80211_hw_config(local, config_changed); 1082 1083 /* Disable ARP filtering */ 1084 if (sdata->vif.bss_conf.arp_filter_enabled) { 1085 sdata->vif.bss_conf.arp_filter_enabled = false; 1086 changed |= BSS_CHANGED_ARP_FILTER; 1087 } 1088 1089 /* The BSSID (not really interesting) and HT changed */ 1090 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1091 ieee80211_bss_info_change_notify(sdata, changed); 1092 1093 if (remove_sta) 1094 sta_info_destroy_addr(sdata, bssid); 1095 1096 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1097 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1098 del_timer_sync(&sdata->u.mgd.timer); 1099 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1100 } 1101 1102 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1103 struct ieee80211_hdr *hdr) 1104 { 1105 /* 1106 * We can postpone the mgd.timer whenever receiving unicast frames 1107 * from AP because we know that the connection is working both ways 1108 * at that time. But multicast frames (and hence also beacons) must 1109 * be ignored here, because we need to trigger the timer during 1110 * data idle periods for sending the periodic probe request to the 1111 * AP we're connected to. 1112 */ 1113 if (is_multicast_ether_addr(hdr->addr1)) 1114 return; 1115 1116 ieee80211_sta_reset_conn_monitor(sdata); 1117 } 1118 1119 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1120 { 1121 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1122 1123 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1124 IEEE80211_STA_CONNECTION_POLL))) 1125 return; 1126 1127 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1128 IEEE80211_STA_BEACON_POLL); 1129 mutex_lock(&sdata->local->iflist_mtx); 1130 ieee80211_recalc_ps(sdata->local, -1); 1131 mutex_unlock(&sdata->local->iflist_mtx); 1132 1133 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1134 return; 1135 1136 /* 1137 * We've received a probe response, but are not sure whether 1138 * we have or will be receiving any beacons or data, so let's 1139 * schedule the timers again, just in case. 1140 */ 1141 ieee80211_sta_reset_beacon_monitor(sdata); 1142 1143 mod_timer(&ifmgd->conn_mon_timer, 1144 round_jiffies_up(jiffies + 1145 IEEE80211_CONNECTION_IDLE_TIME)); 1146 } 1147 1148 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1149 struct ieee80211_hdr *hdr, bool ack) 1150 { 1151 if (!ieee80211_is_data(hdr->frame_control)) 1152 return; 1153 1154 if (ack) 1155 ieee80211_sta_reset_conn_monitor(sdata); 1156 1157 if (ieee80211_is_nullfunc(hdr->frame_control) && 1158 sdata->u.mgd.probe_send_count > 0) { 1159 if (ack) 1160 sdata->u.mgd.probe_send_count = 0; 1161 else 1162 sdata->u.mgd.nullfunc_failed = true; 1163 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1164 } 1165 } 1166 1167 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1168 { 1169 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1170 const u8 *ssid; 1171 u8 *dst = ifmgd->associated->bssid; 1172 u8 unicast_limit = max(1, max_probe_tries - 3); 1173 1174 /* 1175 * Try sending broadcast probe requests for the last three 1176 * probe requests after the first ones failed since some 1177 * buggy APs only support broadcast probe requests. 1178 */ 1179 if (ifmgd->probe_send_count >= unicast_limit) 1180 dst = NULL; 1181 1182 /* 1183 * When the hardware reports an accurate Tx ACK status, it's 1184 * better to send a nullfunc frame instead of a probe request, 1185 * as it will kick us off the AP quickly if we aren't associated 1186 * anymore. The timeout will be reset if the frame is ACKed by 1187 * the AP. 1188 */ 1189 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1190 ifmgd->nullfunc_failed = false; 1191 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1192 } else { 1193 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1194 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0); 1195 } 1196 1197 ifmgd->probe_send_count++; 1198 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1199 run_again(ifmgd, ifmgd->probe_timeout); 1200 } 1201 1202 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1203 bool beacon) 1204 { 1205 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1206 bool already = false; 1207 1208 if (!ieee80211_sdata_running(sdata)) 1209 return; 1210 1211 if (sdata->local->scanning) 1212 return; 1213 1214 if (sdata->local->tmp_channel) 1215 return; 1216 1217 mutex_lock(&ifmgd->mtx); 1218 1219 if (!ifmgd->associated) 1220 goto out; 1221 1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1223 if (beacon && net_ratelimit()) 1224 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1225 "- sending probe request\n", sdata->name); 1226 #endif 1227 1228 /* 1229 * The driver/our work has already reported this event or the 1230 * connection monitoring has kicked in and we have already sent 1231 * a probe request. Or maybe the AP died and the driver keeps 1232 * reporting until we disassociate... 1233 * 1234 * In either case we have to ignore the current call to this 1235 * function (except for setting the correct probe reason bit) 1236 * because otherwise we would reset the timer every time and 1237 * never check whether we received a probe response! 1238 */ 1239 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1240 IEEE80211_STA_CONNECTION_POLL)) 1241 already = true; 1242 1243 if (beacon) 1244 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1245 else 1246 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1247 1248 if (already) 1249 goto out; 1250 1251 mutex_lock(&sdata->local->iflist_mtx); 1252 ieee80211_recalc_ps(sdata->local, -1); 1253 mutex_unlock(&sdata->local->iflist_mtx); 1254 1255 ifmgd->probe_send_count = 0; 1256 ieee80211_mgd_probe_ap_send(sdata); 1257 out: 1258 mutex_unlock(&ifmgd->mtx); 1259 } 1260 1261 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1262 struct ieee80211_vif *vif) 1263 { 1264 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1265 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1266 struct sk_buff *skb; 1267 const u8 *ssid; 1268 1269 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1270 return NULL; 1271 1272 ASSERT_MGD_MTX(ifmgd); 1273 1274 if (!ifmgd->associated) 1275 return NULL; 1276 1277 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1278 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1279 ssid + 2, ssid[1], NULL, 0); 1280 1281 return skb; 1282 } 1283 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1284 1285 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1286 { 1287 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1288 struct ieee80211_local *local = sdata->local; 1289 u8 bssid[ETH_ALEN]; 1290 1291 mutex_lock(&ifmgd->mtx); 1292 if (!ifmgd->associated) { 1293 mutex_unlock(&ifmgd->mtx); 1294 return; 1295 } 1296 1297 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1298 1299 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1300 sdata->name, bssid); 1301 1302 ieee80211_set_disassoc(sdata, true, true); 1303 mutex_unlock(&ifmgd->mtx); 1304 1305 mutex_lock(&local->mtx); 1306 ieee80211_recalc_idle(local); 1307 mutex_unlock(&local->mtx); 1308 /* 1309 * must be outside lock due to cfg80211, 1310 * but that's not a problem. 1311 */ 1312 ieee80211_send_deauth_disassoc(sdata, bssid, 1313 IEEE80211_STYPE_DEAUTH, 1314 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1315 NULL, true); 1316 } 1317 1318 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1319 { 1320 struct ieee80211_sub_if_data *sdata = 1321 container_of(work, struct ieee80211_sub_if_data, 1322 u.mgd.beacon_connection_loss_work); 1323 1324 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1325 __ieee80211_connection_loss(sdata); 1326 else 1327 ieee80211_mgd_probe_ap(sdata, true); 1328 } 1329 1330 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1331 { 1332 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1333 struct ieee80211_hw *hw = &sdata->local->hw; 1334 1335 trace_api_beacon_loss(sdata); 1336 1337 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1338 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1339 } 1340 EXPORT_SYMBOL(ieee80211_beacon_loss); 1341 1342 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1343 { 1344 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1345 struct ieee80211_hw *hw = &sdata->local->hw; 1346 1347 trace_api_connection_loss(sdata); 1348 1349 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1350 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1351 } 1352 EXPORT_SYMBOL(ieee80211_connection_loss); 1353 1354 1355 static enum rx_mgmt_action __must_check 1356 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1357 struct ieee80211_mgmt *mgmt, size_t len) 1358 { 1359 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1360 const u8 *bssid = NULL; 1361 u16 reason_code; 1362 1363 if (len < 24 + 2) 1364 return RX_MGMT_NONE; 1365 1366 ASSERT_MGD_MTX(ifmgd); 1367 1368 bssid = ifmgd->associated->bssid; 1369 1370 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1371 1372 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1373 sdata->name, bssid, reason_code); 1374 1375 ieee80211_set_disassoc(sdata, true, false); 1376 mutex_lock(&sdata->local->mtx); 1377 ieee80211_recalc_idle(sdata->local); 1378 mutex_unlock(&sdata->local->mtx); 1379 1380 return RX_MGMT_CFG80211_DEAUTH; 1381 } 1382 1383 1384 static enum rx_mgmt_action __must_check 1385 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1386 struct ieee80211_mgmt *mgmt, size_t len) 1387 { 1388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1389 u16 reason_code; 1390 1391 if (len < 24 + 2) 1392 return RX_MGMT_NONE; 1393 1394 ASSERT_MGD_MTX(ifmgd); 1395 1396 if (WARN_ON(!ifmgd->associated)) 1397 return RX_MGMT_NONE; 1398 1399 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1400 return RX_MGMT_NONE; 1401 1402 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1403 1404 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1405 sdata->name, mgmt->sa, reason_code); 1406 1407 ieee80211_set_disassoc(sdata, true, false); 1408 mutex_lock(&sdata->local->mtx); 1409 ieee80211_recalc_idle(sdata->local); 1410 mutex_unlock(&sdata->local->mtx); 1411 return RX_MGMT_CFG80211_DISASSOC; 1412 } 1413 1414 1415 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1416 struct ieee80211_mgmt *mgmt, size_t len) 1417 { 1418 struct ieee80211_sub_if_data *sdata = wk->sdata; 1419 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1420 struct ieee80211_local *local = sdata->local; 1421 struct ieee80211_supported_band *sband; 1422 struct sta_info *sta; 1423 struct cfg80211_bss *cbss = wk->assoc.bss; 1424 u8 *pos; 1425 u32 rates, basic_rates; 1426 u16 capab_info, aid; 1427 struct ieee802_11_elems elems; 1428 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1429 u32 changed = 0; 1430 int i, j, err; 1431 bool have_higher_than_11mbit = false; 1432 u16 ap_ht_cap_flags; 1433 1434 /* AssocResp and ReassocResp have identical structure */ 1435 1436 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1437 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1438 1439 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1440 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1441 "set\n", sdata->name, aid); 1442 aid &= ~(BIT(15) | BIT(14)); 1443 1444 pos = mgmt->u.assoc_resp.variable; 1445 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1446 1447 if (!elems.supp_rates) { 1448 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1449 sdata->name); 1450 return false; 1451 } 1452 1453 ifmgd->aid = aid; 1454 1455 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 1456 if (!sta) { 1457 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1458 " the AP\n", sdata->name); 1459 return false; 1460 } 1461 1462 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | 1463 WLAN_STA_ASSOC_AP); 1464 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1465 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 1466 1467 rates = 0; 1468 basic_rates = 0; 1469 sband = local->hw.wiphy->bands[wk->chan->band]; 1470 1471 for (i = 0; i < elems.supp_rates_len; i++) { 1472 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1473 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1474 1475 if (rate > 110) 1476 have_higher_than_11mbit = true; 1477 1478 for (j = 0; j < sband->n_bitrates; j++) { 1479 if (sband->bitrates[j].bitrate == rate) { 1480 rates |= BIT(j); 1481 if (is_basic) 1482 basic_rates |= BIT(j); 1483 break; 1484 } 1485 } 1486 } 1487 1488 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1489 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1490 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1491 1492 if (rate > 110) 1493 have_higher_than_11mbit = true; 1494 1495 for (j = 0; j < sband->n_bitrates; j++) { 1496 if (sband->bitrates[j].bitrate == rate) { 1497 rates |= BIT(j); 1498 if (is_basic) 1499 basic_rates |= BIT(j); 1500 break; 1501 } 1502 } 1503 } 1504 1505 sta->sta.supp_rates[wk->chan->band] = rates; 1506 sdata->vif.bss_conf.basic_rates = basic_rates; 1507 1508 /* cf. IEEE 802.11 9.2.12 */ 1509 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1510 have_higher_than_11mbit) 1511 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1512 else 1513 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1514 1515 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1516 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1517 elems.ht_cap_elem, &sta->sta.ht_cap); 1518 1519 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1520 1521 rate_control_rate_init(sta); 1522 1523 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1524 set_sta_flags(sta, WLAN_STA_MFP); 1525 1526 if (elems.wmm_param) 1527 set_sta_flags(sta, WLAN_STA_WME); 1528 1529 err = sta_info_insert(sta); 1530 sta = NULL; 1531 if (err) { 1532 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1533 " the AP (error %d)\n", sdata->name, err); 1534 return false; 1535 } 1536 1537 /* 1538 * Always handle WMM once after association regardless 1539 * of the first value the AP uses. Setting -1 here has 1540 * that effect because the AP values is an unsigned 1541 * 4-bit value. 1542 */ 1543 ifmgd->wmm_last_param_set = -1; 1544 1545 if (elems.wmm_param) 1546 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1547 elems.wmm_param_len); 1548 else 1549 ieee80211_set_wmm_default(sdata); 1550 1551 local->oper_channel = wk->chan; 1552 1553 if (elems.ht_info_elem && elems.wmm_param && 1554 (sdata->local->hw.queues >= 4) && 1555 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1556 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1557 cbss->bssid, ap_ht_cap_flags); 1558 1559 /* set AID and assoc capability, 1560 * ieee80211_set_associated() will tell the driver */ 1561 bss_conf->aid = aid; 1562 bss_conf->assoc_capability = capab_info; 1563 ieee80211_set_associated(sdata, cbss, changed); 1564 1565 /* 1566 * If we're using 4-addr mode, let the AP know that we're 1567 * doing so, so that it can create the STA VLAN on its side 1568 */ 1569 if (ifmgd->use_4addr) 1570 ieee80211_send_4addr_nullfunc(local, sdata); 1571 1572 /* 1573 * Start timer to probe the connection to the AP now. 1574 * Also start the timer that will detect beacon loss. 1575 */ 1576 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1577 ieee80211_sta_reset_beacon_monitor(sdata); 1578 1579 return true; 1580 } 1581 1582 1583 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1584 struct ieee80211_mgmt *mgmt, 1585 size_t len, 1586 struct ieee80211_rx_status *rx_status, 1587 struct ieee802_11_elems *elems, 1588 bool beacon) 1589 { 1590 struct ieee80211_local *local = sdata->local; 1591 int freq; 1592 struct ieee80211_bss *bss; 1593 struct ieee80211_channel *channel; 1594 bool need_ps = false; 1595 1596 if (sdata->u.mgd.associated) { 1597 bss = (void *)sdata->u.mgd.associated->priv; 1598 /* not previously set so we may need to recalc */ 1599 need_ps = !bss->dtim_period; 1600 } 1601 1602 if (elems->ds_params && elems->ds_params_len == 1) 1603 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1604 rx_status->band); 1605 else 1606 freq = rx_status->freq; 1607 1608 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1609 1610 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1611 return; 1612 1613 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1614 channel, beacon); 1615 if (bss) 1616 ieee80211_rx_bss_put(local, bss); 1617 1618 if (!sdata->u.mgd.associated) 1619 return; 1620 1621 if (need_ps) { 1622 mutex_lock(&local->iflist_mtx); 1623 ieee80211_recalc_ps(local, -1); 1624 mutex_unlock(&local->iflist_mtx); 1625 } 1626 1627 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1628 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1629 ETH_ALEN) == 0)) { 1630 struct ieee80211_channel_sw_ie *sw_elem = 1631 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1632 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1633 bss, rx_status->mactime); 1634 } 1635 } 1636 1637 1638 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1639 struct sk_buff *skb) 1640 { 1641 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1642 struct ieee80211_if_managed *ifmgd; 1643 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1644 size_t baselen, len = skb->len; 1645 struct ieee802_11_elems elems; 1646 1647 ifmgd = &sdata->u.mgd; 1648 1649 ASSERT_MGD_MTX(ifmgd); 1650 1651 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1652 return; /* ignore ProbeResp to foreign address */ 1653 1654 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1655 if (baselen > len) 1656 return; 1657 1658 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1659 &elems); 1660 1661 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1662 1663 if (ifmgd->associated && 1664 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1665 ieee80211_reset_ap_probe(sdata); 1666 } 1667 1668 /* 1669 * This is the canonical list of information elements we care about, 1670 * the filter code also gives us all changes to the Microsoft OUI 1671 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1672 * 1673 * We implement beacon filtering in software since that means we can 1674 * avoid processing the frame here and in cfg80211, and userspace 1675 * will not be able to tell whether the hardware supports it or not. 1676 * 1677 * XXX: This list needs to be dynamic -- userspace needs to be able to 1678 * add items it requires. It also needs to be able to tell us to 1679 * look out for other vendor IEs. 1680 */ 1681 static const u64 care_about_ies = 1682 (1ULL << WLAN_EID_COUNTRY) | 1683 (1ULL << WLAN_EID_ERP_INFO) | 1684 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1685 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1686 (1ULL << WLAN_EID_HT_CAPABILITY) | 1687 (1ULL << WLAN_EID_HT_INFORMATION); 1688 1689 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1690 struct ieee80211_mgmt *mgmt, 1691 size_t len, 1692 struct ieee80211_rx_status *rx_status) 1693 { 1694 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1695 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1696 size_t baselen; 1697 struct ieee802_11_elems elems; 1698 struct ieee80211_local *local = sdata->local; 1699 u32 changed = 0; 1700 bool erp_valid, directed_tim = false; 1701 u8 erp_value = 0; 1702 u32 ncrc; 1703 u8 *bssid; 1704 1705 ASSERT_MGD_MTX(ifmgd); 1706 1707 /* Process beacon from the current BSS */ 1708 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1709 if (baselen > len) 1710 return; 1711 1712 if (rx_status->freq != local->hw.conf.channel->center_freq) 1713 return; 1714 1715 /* 1716 * We might have received a number of frames, among them a 1717 * disassoc frame and a beacon... 1718 */ 1719 if (!ifmgd->associated) 1720 return; 1721 1722 bssid = ifmgd->associated->bssid; 1723 1724 /* 1725 * And in theory even frames from a different AP we were just 1726 * associated to a split-second ago! 1727 */ 1728 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1729 return; 1730 1731 /* Track average RSSI from the Beacon frames of the current AP */ 1732 ifmgd->last_beacon_signal = rx_status->signal; 1733 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1734 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1735 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1736 ifmgd->last_cqm_event_signal = 0; 1737 ifmgd->count_beacon_signal = 1; 1738 } else { 1739 ifmgd->ave_beacon_signal = 1740 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1741 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1742 ifmgd->ave_beacon_signal) / 16; 1743 ifmgd->count_beacon_signal++; 1744 } 1745 if (bss_conf->cqm_rssi_thold && 1746 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1747 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1748 int sig = ifmgd->ave_beacon_signal / 16; 1749 int last_event = ifmgd->last_cqm_event_signal; 1750 int thold = bss_conf->cqm_rssi_thold; 1751 int hyst = bss_conf->cqm_rssi_hyst; 1752 if (sig < thold && 1753 (last_event == 0 || sig < last_event - hyst)) { 1754 ifmgd->last_cqm_event_signal = sig; 1755 ieee80211_cqm_rssi_notify( 1756 &sdata->vif, 1757 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1758 GFP_KERNEL); 1759 } else if (sig > thold && 1760 (last_event == 0 || sig > last_event + hyst)) { 1761 ifmgd->last_cqm_event_signal = sig; 1762 ieee80211_cqm_rssi_notify( 1763 &sdata->vif, 1764 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1765 GFP_KERNEL); 1766 } 1767 } 1768 1769 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1771 if (net_ratelimit()) { 1772 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1773 "to a received beacon\n", sdata->name); 1774 } 1775 #endif 1776 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1777 mutex_lock(&local->iflist_mtx); 1778 ieee80211_recalc_ps(local, -1); 1779 mutex_unlock(&local->iflist_mtx); 1780 } 1781 1782 /* 1783 * Push the beacon loss detection into the future since 1784 * we are processing a beacon from the AP just now. 1785 */ 1786 ieee80211_sta_reset_beacon_monitor(sdata); 1787 1788 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1789 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1790 len - baselen, &elems, 1791 care_about_ies, ncrc); 1792 1793 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1794 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1795 ifmgd->aid); 1796 1797 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1798 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1799 true); 1800 1801 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1802 elems.wmm_param_len); 1803 } 1804 1805 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1806 if (directed_tim) { 1807 if (local->hw.conf.dynamic_ps_timeout > 0) { 1808 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1809 ieee80211_hw_config(local, 1810 IEEE80211_CONF_CHANGE_PS); 1811 ieee80211_send_nullfunc(local, sdata, 0); 1812 } else { 1813 local->pspolling = true; 1814 1815 /* 1816 * Here is assumed that the driver will be 1817 * able to send ps-poll frame and receive a 1818 * response even though power save mode is 1819 * enabled, but some drivers might require 1820 * to disable power save here. This needs 1821 * to be investigated. 1822 */ 1823 ieee80211_send_pspoll(local, sdata); 1824 } 1825 } 1826 } 1827 1828 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1829 return; 1830 ifmgd->beacon_crc = ncrc; 1831 ifmgd->beacon_crc_valid = true; 1832 1833 if (elems.erp_info && elems.erp_info_len >= 1) { 1834 erp_valid = true; 1835 erp_value = elems.erp_info[0]; 1836 } else { 1837 erp_valid = false; 1838 } 1839 changed |= ieee80211_handle_bss_capability(sdata, 1840 le16_to_cpu(mgmt->u.beacon.capab_info), 1841 erp_valid, erp_value); 1842 1843 1844 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1845 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1846 struct sta_info *sta; 1847 struct ieee80211_supported_band *sband; 1848 u16 ap_ht_cap_flags; 1849 1850 rcu_read_lock(); 1851 1852 sta = sta_info_get(sdata, bssid); 1853 if (WARN_ON(!sta)) { 1854 rcu_read_unlock(); 1855 return; 1856 } 1857 1858 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1859 1860 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1861 elems.ht_cap_elem, &sta->sta.ht_cap); 1862 1863 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1864 1865 rcu_read_unlock(); 1866 1867 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1868 bssid, ap_ht_cap_flags); 1869 } 1870 1871 /* Note: country IE parsing is done for us by cfg80211 */ 1872 if (elems.country_elem) { 1873 /* TODO: IBSS also needs this */ 1874 if (elems.pwr_constr_elem) 1875 ieee80211_handle_pwr_constr(sdata, 1876 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1877 elems.pwr_constr_elem, 1878 elems.pwr_constr_elem_len); 1879 } 1880 1881 ieee80211_bss_info_change_notify(sdata, changed); 1882 } 1883 1884 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1885 struct sk_buff *skb) 1886 { 1887 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1888 struct ieee80211_rx_status *rx_status; 1889 struct ieee80211_mgmt *mgmt; 1890 enum rx_mgmt_action rma = RX_MGMT_NONE; 1891 u16 fc; 1892 1893 rx_status = (struct ieee80211_rx_status *) skb->cb; 1894 mgmt = (struct ieee80211_mgmt *) skb->data; 1895 fc = le16_to_cpu(mgmt->frame_control); 1896 1897 mutex_lock(&ifmgd->mtx); 1898 1899 if (ifmgd->associated && 1900 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1901 switch (fc & IEEE80211_FCTL_STYPE) { 1902 case IEEE80211_STYPE_BEACON: 1903 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1904 rx_status); 1905 break; 1906 case IEEE80211_STYPE_PROBE_RESP: 1907 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1908 break; 1909 case IEEE80211_STYPE_DEAUTH: 1910 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1911 break; 1912 case IEEE80211_STYPE_DISASSOC: 1913 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1914 break; 1915 case IEEE80211_STYPE_ACTION: 1916 switch (mgmt->u.action.category) { 1917 case WLAN_CATEGORY_SPECTRUM_MGMT: 1918 ieee80211_sta_process_chanswitch(sdata, 1919 &mgmt->u.action.u.chan_switch.sw_elem, 1920 (void *)ifmgd->associated->priv, 1921 rx_status->mactime); 1922 break; 1923 } 1924 } 1925 mutex_unlock(&ifmgd->mtx); 1926 1927 switch (rma) { 1928 case RX_MGMT_NONE: 1929 /* no action */ 1930 break; 1931 case RX_MGMT_CFG80211_DEAUTH: 1932 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1933 break; 1934 case RX_MGMT_CFG80211_DISASSOC: 1935 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 1936 break; 1937 default: 1938 WARN(1, "unexpected: %d", rma); 1939 } 1940 return; 1941 } 1942 1943 mutex_unlock(&ifmgd->mtx); 1944 1945 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 1946 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 1947 struct ieee80211_local *local = sdata->local; 1948 struct ieee80211_work *wk; 1949 1950 mutex_lock(&local->mtx); 1951 list_for_each_entry(wk, &local->work_list, list) { 1952 if (wk->sdata != sdata) 1953 continue; 1954 1955 if (wk->type != IEEE80211_WORK_ASSOC && 1956 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 1957 continue; 1958 1959 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 1960 continue; 1961 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 1962 continue; 1963 1964 /* 1965 * Printing the message only here means we can't 1966 * spuriously print it, but it also means that it 1967 * won't be printed when the frame comes in before 1968 * we even tried to associate or in similar cases. 1969 * 1970 * Ultimately, I suspect cfg80211 should print the 1971 * messages instead. 1972 */ 1973 printk(KERN_DEBUG 1974 "%s: deauthenticated from %pM (Reason: %u)\n", 1975 sdata->name, mgmt->bssid, 1976 le16_to_cpu(mgmt->u.deauth.reason_code)); 1977 1978 list_del_rcu(&wk->list); 1979 free_work(wk); 1980 break; 1981 } 1982 mutex_unlock(&local->mtx); 1983 1984 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 1985 } 1986 } 1987 1988 static void ieee80211_sta_timer(unsigned long data) 1989 { 1990 struct ieee80211_sub_if_data *sdata = 1991 (struct ieee80211_sub_if_data *) data; 1992 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1993 struct ieee80211_local *local = sdata->local; 1994 1995 if (local->quiescing) { 1996 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 1997 return; 1998 } 1999 2000 ieee80211_queue_work(&local->hw, &sdata->work); 2001 } 2002 2003 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2004 u8 *bssid) 2005 { 2006 struct ieee80211_local *local = sdata->local; 2007 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2008 2009 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2010 IEEE80211_STA_BEACON_POLL); 2011 2012 ieee80211_set_disassoc(sdata, true, true); 2013 mutex_unlock(&ifmgd->mtx); 2014 mutex_lock(&local->mtx); 2015 ieee80211_recalc_idle(local); 2016 mutex_unlock(&local->mtx); 2017 /* 2018 * must be outside lock due to cfg80211, 2019 * but that's not a problem. 2020 */ 2021 ieee80211_send_deauth_disassoc(sdata, bssid, 2022 IEEE80211_STYPE_DEAUTH, 2023 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2024 NULL, true); 2025 mutex_lock(&ifmgd->mtx); 2026 } 2027 2028 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2029 { 2030 struct ieee80211_local *local = sdata->local; 2031 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2032 2033 /* then process the rest of the work */ 2034 mutex_lock(&ifmgd->mtx); 2035 2036 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2037 IEEE80211_STA_CONNECTION_POLL) && 2038 ifmgd->associated) { 2039 u8 bssid[ETH_ALEN]; 2040 int max_tries; 2041 2042 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2043 2044 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2045 max_tries = max_nullfunc_tries; 2046 else 2047 max_tries = max_probe_tries; 2048 2049 /* ACK received for nullfunc probing frame */ 2050 if (!ifmgd->probe_send_count) 2051 ieee80211_reset_ap_probe(sdata); 2052 else if (ifmgd->nullfunc_failed) { 2053 if (ifmgd->probe_send_count < max_tries) { 2054 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2055 wiphy_debug(local->hw.wiphy, 2056 "%s: No ack for nullfunc frame to" 2057 " AP %pM, try %d/%i\n", 2058 sdata->name, bssid, 2059 ifmgd->probe_send_count, max_tries); 2060 #endif 2061 ieee80211_mgd_probe_ap_send(sdata); 2062 } else { 2063 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2064 wiphy_debug(local->hw.wiphy, 2065 "%s: No ack for nullfunc frame to" 2066 " AP %pM, disconnecting.\n", 2067 sdata->name, bssid); 2068 #endif 2069 ieee80211_sta_connection_lost(sdata, bssid); 2070 } 2071 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2072 run_again(ifmgd, ifmgd->probe_timeout); 2073 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2074 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2075 wiphy_debug(local->hw.wiphy, 2076 "%s: Failed to send nullfunc to AP %pM" 2077 " after %dms, disconnecting.\n", 2078 sdata->name, 2079 bssid, probe_wait_ms); 2080 #endif 2081 ieee80211_sta_connection_lost(sdata, bssid); 2082 } else if (ifmgd->probe_send_count < max_tries) { 2083 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2084 wiphy_debug(local->hw.wiphy, 2085 "%s: No probe response from AP %pM" 2086 " after %dms, try %d/%i\n", 2087 sdata->name, 2088 bssid, probe_wait_ms, 2089 ifmgd->probe_send_count, max_tries); 2090 #endif 2091 ieee80211_mgd_probe_ap_send(sdata); 2092 } else { 2093 /* 2094 * We actually lost the connection ... or did we? 2095 * Let's make sure! 2096 */ 2097 wiphy_debug(local->hw.wiphy, 2098 "%s: No probe response from AP %pM" 2099 " after %dms, disconnecting.\n", 2100 sdata->name, 2101 bssid, probe_wait_ms); 2102 2103 ieee80211_sta_connection_lost(sdata, bssid); 2104 } 2105 } 2106 2107 mutex_unlock(&ifmgd->mtx); 2108 } 2109 2110 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2111 { 2112 struct ieee80211_sub_if_data *sdata = 2113 (struct ieee80211_sub_if_data *) data; 2114 struct ieee80211_local *local = sdata->local; 2115 2116 if (local->quiescing) 2117 return; 2118 2119 ieee80211_queue_work(&sdata->local->hw, 2120 &sdata->u.mgd.beacon_connection_loss_work); 2121 } 2122 2123 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2124 { 2125 struct ieee80211_sub_if_data *sdata = 2126 (struct ieee80211_sub_if_data *) data; 2127 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2128 struct ieee80211_local *local = sdata->local; 2129 2130 if (local->quiescing) 2131 return; 2132 2133 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2134 } 2135 2136 static void ieee80211_sta_monitor_work(struct work_struct *work) 2137 { 2138 struct ieee80211_sub_if_data *sdata = 2139 container_of(work, struct ieee80211_sub_if_data, 2140 u.mgd.monitor_work); 2141 2142 ieee80211_mgd_probe_ap(sdata, false); 2143 } 2144 2145 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2146 { 2147 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2148 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2149 IEEE80211_STA_CONNECTION_POLL); 2150 2151 /* let's probe the connection once */ 2152 ieee80211_queue_work(&sdata->local->hw, 2153 &sdata->u.mgd.monitor_work); 2154 /* and do all the other regular work too */ 2155 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2156 } 2157 } 2158 2159 #ifdef CONFIG_PM 2160 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2161 { 2162 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2163 2164 /* 2165 * we need to use atomic bitops for the running bits 2166 * only because both timers might fire at the same 2167 * time -- the code here is properly synchronised. 2168 */ 2169 2170 cancel_work_sync(&ifmgd->request_smps_work); 2171 2172 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2173 if (del_timer_sync(&ifmgd->timer)) 2174 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2175 2176 cancel_work_sync(&ifmgd->chswitch_work); 2177 if (del_timer_sync(&ifmgd->chswitch_timer)) 2178 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2179 2180 cancel_work_sync(&ifmgd->monitor_work); 2181 /* these will just be re-established on connection */ 2182 del_timer_sync(&ifmgd->conn_mon_timer); 2183 del_timer_sync(&ifmgd->bcn_mon_timer); 2184 } 2185 2186 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2187 { 2188 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2189 2190 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2191 add_timer(&ifmgd->timer); 2192 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2193 add_timer(&ifmgd->chswitch_timer); 2194 ieee80211_sta_reset_beacon_monitor(sdata); 2195 ieee80211_restart_sta_timer(sdata); 2196 } 2197 #endif 2198 2199 /* interface setup */ 2200 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2201 { 2202 struct ieee80211_if_managed *ifmgd; 2203 2204 ifmgd = &sdata->u.mgd; 2205 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2206 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2207 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2208 ieee80211_beacon_connection_loss_work); 2209 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2210 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2211 (unsigned long) sdata); 2212 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2213 (unsigned long) sdata); 2214 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2215 (unsigned long) sdata); 2216 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2217 (unsigned long) sdata); 2218 2219 ifmgd->flags = 0; 2220 2221 mutex_init(&ifmgd->mtx); 2222 2223 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2224 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2225 else 2226 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2227 } 2228 2229 /* scan finished notification */ 2230 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2231 { 2232 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2233 2234 /* Restart STA timers */ 2235 rcu_read_lock(); 2236 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2237 ieee80211_restart_sta_timer(sdata); 2238 rcu_read_unlock(); 2239 } 2240 2241 int ieee80211_max_network_latency(struct notifier_block *nb, 2242 unsigned long data, void *dummy) 2243 { 2244 s32 latency_usec = (s32) data; 2245 struct ieee80211_local *local = 2246 container_of(nb, struct ieee80211_local, 2247 network_latency_notifier); 2248 2249 mutex_lock(&local->iflist_mtx); 2250 ieee80211_recalc_ps(local, latency_usec); 2251 mutex_unlock(&local->iflist_mtx); 2252 2253 return 0; 2254 } 2255 2256 /* config hooks */ 2257 static enum work_done_result 2258 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2259 struct sk_buff *skb) 2260 { 2261 if (!skb) { 2262 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2263 return WORK_DONE_DESTROY; 2264 } 2265 2266 if (wk->type == IEEE80211_WORK_AUTH) { 2267 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2268 return WORK_DONE_DESTROY; 2269 } 2270 2271 mutex_lock(&wk->sdata->u.mgd.mtx); 2272 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2273 mutex_unlock(&wk->sdata->u.mgd.mtx); 2274 2275 wk->type = IEEE80211_WORK_AUTH; 2276 wk->probe_auth.tries = 0; 2277 return WORK_DONE_REQUEUE; 2278 } 2279 2280 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2281 struct cfg80211_auth_request *req) 2282 { 2283 const u8 *ssid; 2284 struct ieee80211_work *wk; 2285 u16 auth_alg; 2286 2287 if (req->local_state_change) 2288 return 0; /* no need to update mac80211 state */ 2289 2290 switch (req->auth_type) { 2291 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2292 auth_alg = WLAN_AUTH_OPEN; 2293 break; 2294 case NL80211_AUTHTYPE_SHARED_KEY: 2295 if (IS_ERR(sdata->local->wep_tx_tfm)) 2296 return -EOPNOTSUPP; 2297 auth_alg = WLAN_AUTH_SHARED_KEY; 2298 break; 2299 case NL80211_AUTHTYPE_FT: 2300 auth_alg = WLAN_AUTH_FT; 2301 break; 2302 case NL80211_AUTHTYPE_NETWORK_EAP: 2303 auth_alg = WLAN_AUTH_LEAP; 2304 break; 2305 default: 2306 return -EOPNOTSUPP; 2307 } 2308 2309 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2310 if (!wk) 2311 return -ENOMEM; 2312 2313 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2314 2315 if (req->ie && req->ie_len) { 2316 memcpy(wk->ie, req->ie, req->ie_len); 2317 wk->ie_len = req->ie_len; 2318 } 2319 2320 if (req->key && req->key_len) { 2321 wk->probe_auth.key_len = req->key_len; 2322 wk->probe_auth.key_idx = req->key_idx; 2323 memcpy(wk->probe_auth.key, req->key, req->key_len); 2324 } 2325 2326 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2327 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2328 wk->probe_auth.ssid_len = ssid[1]; 2329 2330 wk->probe_auth.algorithm = auth_alg; 2331 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2332 2333 /* if we already have a probe, don't probe again */ 2334 if (req->bss->proberesp_ies) 2335 wk->type = IEEE80211_WORK_AUTH; 2336 else 2337 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2338 wk->chan = req->bss->channel; 2339 wk->chan_type = NL80211_CHAN_NO_HT; 2340 wk->sdata = sdata; 2341 wk->done = ieee80211_probe_auth_done; 2342 2343 ieee80211_add_work(wk); 2344 return 0; 2345 } 2346 2347 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2348 struct sk_buff *skb) 2349 { 2350 struct ieee80211_mgmt *mgmt; 2351 struct ieee80211_rx_status *rx_status; 2352 struct ieee802_11_elems elems; 2353 u16 status; 2354 2355 if (!skb) { 2356 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2357 return WORK_DONE_DESTROY; 2358 } 2359 2360 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2361 mutex_lock(&wk->sdata->u.mgd.mtx); 2362 rx_status = (void *) skb->cb; 2363 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2364 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2365 &elems, true); 2366 mutex_unlock(&wk->sdata->u.mgd.mtx); 2367 2368 wk->type = IEEE80211_WORK_ASSOC; 2369 /* not really done yet */ 2370 return WORK_DONE_REQUEUE; 2371 } 2372 2373 mgmt = (void *)skb->data; 2374 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2375 2376 if (status == WLAN_STATUS_SUCCESS) { 2377 mutex_lock(&wk->sdata->u.mgd.mtx); 2378 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2379 mutex_unlock(&wk->sdata->u.mgd.mtx); 2380 /* oops -- internal error -- send timeout for now */ 2381 cfg80211_send_assoc_timeout(wk->sdata->dev, 2382 wk->filter_ta); 2383 return WORK_DONE_DESTROY; 2384 } 2385 2386 mutex_unlock(&wk->sdata->u.mgd.mtx); 2387 } 2388 2389 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2390 return WORK_DONE_DESTROY; 2391 } 2392 2393 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2394 struct cfg80211_assoc_request *req) 2395 { 2396 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2397 struct ieee80211_bss *bss = (void *)req->bss->priv; 2398 struct ieee80211_work *wk; 2399 const u8 *ssid; 2400 int i; 2401 2402 mutex_lock(&ifmgd->mtx); 2403 if (ifmgd->associated) { 2404 if (!req->prev_bssid || 2405 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2406 ETH_ALEN)) { 2407 /* 2408 * We are already associated and the request was not a 2409 * reassociation request from the current BSS, so 2410 * reject it. 2411 */ 2412 mutex_unlock(&ifmgd->mtx); 2413 return -EALREADY; 2414 } 2415 2416 /* Trying to reassociate - clear previous association state */ 2417 ieee80211_set_disassoc(sdata, true, false); 2418 } 2419 mutex_unlock(&ifmgd->mtx); 2420 2421 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2422 if (!wk) 2423 return -ENOMEM; 2424 2425 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2426 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2427 2428 ifmgd->beacon_crc_valid = false; 2429 2430 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2431 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2432 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2433 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2434 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2435 2436 2437 if (req->ie && req->ie_len) { 2438 memcpy(wk->ie, req->ie, req->ie_len); 2439 wk->ie_len = req->ie_len; 2440 } else 2441 wk->ie_len = 0; 2442 2443 wk->assoc.bss = req->bss; 2444 2445 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2446 2447 /* new association always uses requested smps mode */ 2448 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2449 if (ifmgd->powersave) 2450 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2451 else 2452 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2453 } else 2454 ifmgd->ap_smps = ifmgd->req_smps; 2455 2456 wk->assoc.smps = ifmgd->ap_smps; 2457 /* 2458 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2459 * We still associate in non-HT mode (11a/b/g) if any one of these 2460 * ciphers is configured as pairwise. 2461 * We can set this to true for non-11n hardware, that'll be checked 2462 * separately along with the peer capabilities. 2463 */ 2464 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2465 wk->assoc.capability = req->bss->capability; 2466 wk->assoc.wmm_used = bss->wmm_used; 2467 wk->assoc.supp_rates = bss->supp_rates; 2468 wk->assoc.supp_rates_len = bss->supp_rates_len; 2469 wk->assoc.ht_information_ie = 2470 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2471 2472 if (bss->wmm_used && bss->uapsd_supported && 2473 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2474 wk->assoc.uapsd_used = true; 2475 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2476 } else { 2477 wk->assoc.uapsd_used = false; 2478 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2479 } 2480 2481 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2482 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2483 wk->assoc.ssid_len = ssid[1]; 2484 2485 if (req->prev_bssid) 2486 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2487 2488 wk->chan = req->bss->channel; 2489 wk->chan_type = NL80211_CHAN_NO_HT; 2490 wk->sdata = sdata; 2491 wk->done = ieee80211_assoc_done; 2492 if (!bss->dtim_period && 2493 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2494 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2495 else 2496 wk->type = IEEE80211_WORK_ASSOC; 2497 2498 if (req->use_mfp) { 2499 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2500 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2501 } else { 2502 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2503 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2504 } 2505 2506 if (req->crypto.control_port) 2507 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2508 else 2509 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2510 2511 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2512 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2513 2514 ieee80211_add_work(wk); 2515 return 0; 2516 } 2517 2518 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2519 struct cfg80211_deauth_request *req, 2520 void *cookie) 2521 { 2522 struct ieee80211_local *local = sdata->local; 2523 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2524 struct ieee80211_work *wk; 2525 u8 bssid[ETH_ALEN]; 2526 bool assoc_bss = false; 2527 2528 mutex_lock(&ifmgd->mtx); 2529 2530 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2531 if (ifmgd->associated == req->bss) { 2532 ieee80211_set_disassoc(sdata, false, true); 2533 mutex_unlock(&ifmgd->mtx); 2534 assoc_bss = true; 2535 } else { 2536 bool not_auth_yet = false; 2537 2538 mutex_unlock(&ifmgd->mtx); 2539 2540 mutex_lock(&local->mtx); 2541 list_for_each_entry(wk, &local->work_list, list) { 2542 if (wk->sdata != sdata) 2543 continue; 2544 2545 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2546 wk->type != IEEE80211_WORK_AUTH && 2547 wk->type != IEEE80211_WORK_ASSOC && 2548 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2549 continue; 2550 2551 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2552 continue; 2553 2554 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2555 list_del_rcu(&wk->list); 2556 free_work(wk); 2557 break; 2558 } 2559 mutex_unlock(&local->mtx); 2560 2561 /* 2562 * If somebody requests authentication and we haven't 2563 * sent out an auth frame yet there's no need to send 2564 * out a deauth frame either. If the state was PROBE, 2565 * then this is the case. If it's AUTH we have sent a 2566 * frame, and if it's IDLE we have completed the auth 2567 * process already. 2568 */ 2569 if (not_auth_yet) { 2570 __cfg80211_auth_canceled(sdata->dev, bssid); 2571 return 0; 2572 } 2573 } 2574 2575 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2576 sdata->name, bssid, req->reason_code); 2577 2578 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2579 req->reason_code, cookie, 2580 !req->local_state_change); 2581 if (assoc_bss) 2582 sta_info_destroy_addr(sdata, bssid); 2583 2584 mutex_lock(&sdata->local->mtx); 2585 ieee80211_recalc_idle(sdata->local); 2586 mutex_unlock(&sdata->local->mtx); 2587 2588 return 0; 2589 } 2590 2591 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2592 struct cfg80211_disassoc_request *req, 2593 void *cookie) 2594 { 2595 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2596 u8 bssid[ETH_ALEN]; 2597 2598 mutex_lock(&ifmgd->mtx); 2599 2600 /* 2601 * cfg80211 should catch this ... but it's racy since 2602 * we can receive a disassoc frame, process it, hand it 2603 * to cfg80211 while that's in a locked section already 2604 * trying to tell us that the user wants to disconnect. 2605 */ 2606 if (ifmgd->associated != req->bss) { 2607 mutex_unlock(&ifmgd->mtx); 2608 return -ENOLINK; 2609 } 2610 2611 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2612 sdata->name, req->bss->bssid, req->reason_code); 2613 2614 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2615 ieee80211_set_disassoc(sdata, false, true); 2616 2617 mutex_unlock(&ifmgd->mtx); 2618 2619 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2620 IEEE80211_STYPE_DISASSOC, req->reason_code, 2621 cookie, !req->local_state_change); 2622 sta_info_destroy_addr(sdata, bssid); 2623 2624 mutex_lock(&sdata->local->mtx); 2625 ieee80211_recalc_idle(sdata->local); 2626 mutex_unlock(&sdata->local->mtx); 2627 2628 return 0; 2629 } 2630 2631 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2632 enum nl80211_cqm_rssi_threshold_event rssi_event, 2633 gfp_t gfp) 2634 { 2635 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2636 2637 trace_api_cqm_rssi_notify(sdata, rssi_event); 2638 2639 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2640 } 2641 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2642