1 /* 2 * BSS client mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/etherdevice.h> 19 #include <linux/moduleparam.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/pm_qos.h> 22 #include <linux/crc32.h> 23 #include <linux/slab.h> 24 #include <linux/export.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "led.h" 32 33 static int max_nullfunc_tries = 2; 34 module_param(max_nullfunc_tries, int, 0644); 35 MODULE_PARM_DESC(max_nullfunc_tries, 36 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 37 38 static int max_probe_tries = 5; 39 module_param(max_probe_tries, int, 0644); 40 MODULE_PARM_DESC(max_probe_tries, 41 "Maximum probe tries before disconnecting (reason 4)."); 42 43 /* 44 * Beacon loss timeout is calculated as N frames times the 45 * advertised beacon interval. This may need to be somewhat 46 * higher than what hardware might detect to account for 47 * delays in the host processing frames. But since we also 48 * probe on beacon miss before declaring the connection lost 49 * default to what we want. 50 */ 51 #define IEEE80211_BEACON_LOSS_COUNT 7 52 53 /* 54 * Time the connection can be idle before we probe 55 * it to see if we can still talk to the AP. 56 */ 57 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 58 /* 59 * Time we wait for a probe response after sending 60 * a probe request because of beacon loss or for 61 * checking the connection still works. 62 */ 63 static int probe_wait_ms = 500; 64 module_param(probe_wait_ms, int, 0644); 65 MODULE_PARM_DESC(probe_wait_ms, 66 "Maximum time(ms) to wait for probe response" 67 " before disconnecting (reason 4)."); 68 69 /* 70 * Weight given to the latest Beacon frame when calculating average signal 71 * strength for Beacon frames received in the current BSS. This must be 72 * between 1 and 15. 73 */ 74 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 75 76 /* 77 * How many Beacon frames need to have been used in average signal strength 78 * before starting to indicate signal change events. 79 */ 80 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 81 82 #define TMR_RUNNING_TIMER 0 83 #define TMR_RUNNING_CHANSW 1 84 85 /* 86 * All cfg80211 functions have to be called outside a locked 87 * section so that they can acquire a lock themselves... This 88 * is much simpler than queuing up things in cfg80211, but we 89 * do need some indirection for that here. 90 */ 91 enum rx_mgmt_action { 92 /* no action required */ 93 RX_MGMT_NONE, 94 95 /* caller must call cfg80211_send_deauth() */ 96 RX_MGMT_CFG80211_DEAUTH, 97 98 /* caller must call cfg80211_send_disassoc() */ 99 RX_MGMT_CFG80211_DISASSOC, 100 }; 101 102 /* utils */ 103 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 104 { 105 lockdep_assert_held(&ifmgd->mtx); 106 } 107 108 /* 109 * We can have multiple work items (and connection probing) 110 * scheduling this timer, but we need to take care to only 111 * reschedule it when it should fire _earlier_ than it was 112 * asked for before, or if it's not pending right now. This 113 * function ensures that. Note that it then is required to 114 * run this function for all timeouts after the first one 115 * has happened -- the work that runs from this timer will 116 * do that. 117 */ 118 static void run_again(struct ieee80211_if_managed *ifmgd, 119 unsigned long timeout) 120 { 121 ASSERT_MGD_MTX(ifmgd); 122 123 if (!timer_pending(&ifmgd->timer) || 124 time_before(timeout, ifmgd->timer.expires)) 125 mod_timer(&ifmgd->timer, timeout); 126 } 127 128 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 129 { 130 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER) 131 return; 132 133 mod_timer(&sdata->u.mgd.bcn_mon_timer, 134 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 135 } 136 137 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 138 { 139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 140 141 if (unlikely(!sdata->u.mgd.associated)) 142 return; 143 144 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 145 return; 146 147 mod_timer(&sdata->u.mgd.conn_mon_timer, 148 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 149 150 ifmgd->probe_send_count = 0; 151 } 152 153 static int ecw2cw(int ecw) 154 { 155 return (1 << ecw) - 1; 156 } 157 158 /* 159 * ieee80211_enable_ht should be called only after the operating band 160 * has been determined as ht configuration depends on the hw's 161 * HT abilities for a specific band. 162 */ 163 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, 164 struct ieee80211_ht_info *hti, 165 const u8 *bssid, u16 ap_ht_cap_flags, 166 bool beacon_htcap_ie) 167 { 168 struct ieee80211_local *local = sdata->local; 169 struct ieee80211_supported_band *sband; 170 struct sta_info *sta; 171 u32 changed = 0; 172 int hti_cfreq; 173 u16 ht_opmode; 174 bool enable_ht = true; 175 enum nl80211_channel_type prev_chantype; 176 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 177 178 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 179 180 prev_chantype = sdata->vif.bss_conf.channel_type; 181 182 /* HT is not supported */ 183 if (!sband->ht_cap.ht_supported) 184 enable_ht = false; 185 186 if (enable_ht) { 187 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan, 188 sband->band); 189 /* check that channel matches the right operating channel */ 190 if (local->hw.conf.channel->center_freq != hti_cfreq) { 191 /* Some APs mess this up, evidently. 192 * Netgear WNDR3700 sometimes reports 4 higher than 193 * the actual channel, for instance. 194 */ 195 printk(KERN_DEBUG 196 "%s: Wrong control channel in association" 197 " response: configured center-freq: %d" 198 " hti-cfreq: %d hti->control_chan: %d" 199 " band: %d. Disabling HT.\n", 200 sdata->name, 201 local->hw.conf.channel->center_freq, 202 hti_cfreq, hti->control_chan, 203 sband->band); 204 enable_ht = false; 205 } 206 } 207 208 if (enable_ht) { 209 channel_type = NL80211_CHAN_HT20; 210 211 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && 212 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && 213 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { 214 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 215 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 216 if (!(local->hw.conf.channel->flags & 217 IEEE80211_CHAN_NO_HT40PLUS)) 218 channel_type = NL80211_CHAN_HT40PLUS; 219 break; 220 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 221 if (!(local->hw.conf.channel->flags & 222 IEEE80211_CHAN_NO_HT40MINUS)) 223 channel_type = NL80211_CHAN_HT40MINUS; 224 break; 225 } 226 } 227 } 228 229 if (local->tmp_channel) 230 local->tmp_channel_type = channel_type; 231 232 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 233 /* can only fail due to HT40+/- mismatch */ 234 channel_type = NL80211_CHAN_HT20; 235 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); 236 } 237 238 if (beacon_htcap_ie && (prev_chantype != channel_type)) { 239 /* 240 * Whenever the AP announces the HT mode change that can be 241 * 40MHz intolerant or etc., it would be safer to stop tx 242 * queues before doing hw config to avoid buffer overflow. 243 */ 244 ieee80211_stop_queues_by_reason(&sdata->local->hw, 245 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 246 247 /* flush out all packets */ 248 synchronize_net(); 249 250 drv_flush(local, false); 251 } 252 253 /* channel_type change automatically detected */ 254 ieee80211_hw_config(local, 0); 255 256 if (prev_chantype != channel_type) { 257 rcu_read_lock(); 258 sta = sta_info_get(sdata, bssid); 259 if (sta) 260 rate_control_rate_update(local, sband, sta, 261 IEEE80211_RC_HT_CHANGED, 262 channel_type); 263 rcu_read_unlock(); 264 265 if (beacon_htcap_ie) 266 ieee80211_wake_queues_by_reason(&sdata->local->hw, 267 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE); 268 } 269 270 ht_opmode = le16_to_cpu(hti->operation_mode); 271 272 /* if bss configuration changed store the new one */ 273 if (sdata->ht_opmode_valid != enable_ht || 274 sdata->vif.bss_conf.ht_operation_mode != ht_opmode || 275 prev_chantype != channel_type) { 276 changed |= BSS_CHANGED_HT; 277 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 278 sdata->ht_opmode_valid = enable_ht; 279 } 280 281 return changed; 282 } 283 284 /* frame sending functions */ 285 286 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 287 const u8 *bssid, u16 stype, u16 reason, 288 void *cookie, bool send_frame) 289 { 290 struct ieee80211_local *local = sdata->local; 291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 292 struct sk_buff *skb; 293 struct ieee80211_mgmt *mgmt; 294 295 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 296 if (!skb) 297 return; 298 299 skb_reserve(skb, local->hw.extra_tx_headroom); 300 301 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 302 memset(mgmt, 0, 24); 303 memcpy(mgmt->da, bssid, ETH_ALEN); 304 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 305 memcpy(mgmt->bssid, bssid, ETH_ALEN); 306 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 307 skb_put(skb, 2); 308 /* u.deauth.reason_code == u.disassoc.reason_code */ 309 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 310 311 if (stype == IEEE80211_STYPE_DEAUTH) 312 if (cookie) 313 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 314 else 315 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 316 else 317 if (cookie) 318 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 319 else 320 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 321 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 322 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 323 324 if (send_frame) 325 ieee80211_tx_skb(sdata, skb); 326 else 327 kfree_skb(skb); 328 } 329 330 void ieee80211_send_pspoll(struct ieee80211_local *local, 331 struct ieee80211_sub_if_data *sdata) 332 { 333 struct ieee80211_pspoll *pspoll; 334 struct sk_buff *skb; 335 336 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 337 if (!skb) 338 return; 339 340 pspoll = (struct ieee80211_pspoll *) skb->data; 341 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 342 343 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 344 ieee80211_tx_skb(sdata, skb); 345 } 346 347 void ieee80211_send_nullfunc(struct ieee80211_local *local, 348 struct ieee80211_sub_if_data *sdata, 349 int powersave) 350 { 351 struct sk_buff *skb; 352 struct ieee80211_hdr_3addr *nullfunc; 353 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 354 355 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 356 if (!skb) 357 return; 358 359 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 360 if (powersave) 361 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 362 363 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 364 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 365 IEEE80211_STA_CONNECTION_POLL)) 366 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 367 368 ieee80211_tx_skb(sdata, skb); 369 } 370 371 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 372 struct ieee80211_sub_if_data *sdata) 373 { 374 struct sk_buff *skb; 375 struct ieee80211_hdr *nullfunc; 376 __le16 fc; 377 378 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 379 return; 380 381 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 382 if (!skb) 383 return; 384 385 skb_reserve(skb, local->hw.extra_tx_headroom); 386 387 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 388 memset(nullfunc, 0, 30); 389 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 390 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 391 nullfunc->frame_control = fc; 392 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 393 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 394 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 395 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 396 397 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 398 ieee80211_tx_skb(sdata, skb); 399 } 400 401 /* spectrum management related things */ 402 static void ieee80211_chswitch_work(struct work_struct *work) 403 { 404 struct ieee80211_sub_if_data *sdata = 405 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 406 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 407 408 if (!ieee80211_sdata_running(sdata)) 409 return; 410 411 mutex_lock(&ifmgd->mtx); 412 if (!ifmgd->associated) 413 goto out; 414 415 sdata->local->oper_channel = sdata->local->csa_channel; 416 if (!sdata->local->ops->channel_switch) { 417 /* call "hw_config" only if doing sw channel switch */ 418 ieee80211_hw_config(sdata->local, 419 IEEE80211_CONF_CHANGE_CHANNEL); 420 } else { 421 /* update the device channel directly */ 422 sdata->local->hw.conf.channel = sdata->local->oper_channel; 423 } 424 425 /* XXX: shouldn't really modify cfg80211-owned data! */ 426 ifmgd->associated->channel = sdata->local->oper_channel; 427 428 ieee80211_wake_queues_by_reason(&sdata->local->hw, 429 IEEE80211_QUEUE_STOP_REASON_CSA); 430 out: 431 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 432 mutex_unlock(&ifmgd->mtx); 433 } 434 435 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 436 { 437 struct ieee80211_sub_if_data *sdata; 438 struct ieee80211_if_managed *ifmgd; 439 440 sdata = vif_to_sdata(vif); 441 ifmgd = &sdata->u.mgd; 442 443 trace_api_chswitch_done(sdata, success); 444 if (!success) { 445 /* 446 * If the channel switch was not successful, stay 447 * around on the old channel. We currently lack 448 * good handling of this situation, possibly we 449 * should just drop the association. 450 */ 451 sdata->local->csa_channel = sdata->local->oper_channel; 452 } 453 454 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 455 } 456 EXPORT_SYMBOL(ieee80211_chswitch_done); 457 458 static void ieee80211_chswitch_timer(unsigned long data) 459 { 460 struct ieee80211_sub_if_data *sdata = 461 (struct ieee80211_sub_if_data *) data; 462 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 463 464 if (sdata->local->quiescing) { 465 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 466 return; 467 } 468 469 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 470 } 471 472 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 473 struct ieee80211_channel_sw_ie *sw_elem, 474 struct ieee80211_bss *bss, 475 u64 timestamp) 476 { 477 struct cfg80211_bss *cbss = 478 container_of((void *)bss, struct cfg80211_bss, priv); 479 struct ieee80211_channel *new_ch; 480 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 481 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 482 cbss->channel->band); 483 484 ASSERT_MGD_MTX(ifmgd); 485 486 if (!ifmgd->associated) 487 return; 488 489 if (sdata->local->scanning) 490 return; 491 492 /* Disregard subsequent beacons if we are already running a timer 493 processing a CSA */ 494 495 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 496 return; 497 498 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 499 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 500 return; 501 502 sdata->local->csa_channel = new_ch; 503 504 if (sdata->local->ops->channel_switch) { 505 /* use driver's channel switch callback */ 506 struct ieee80211_channel_switch ch_switch; 507 memset(&ch_switch, 0, sizeof(ch_switch)); 508 ch_switch.timestamp = timestamp; 509 if (sw_elem->mode) { 510 ch_switch.block_tx = true; 511 ieee80211_stop_queues_by_reason(&sdata->local->hw, 512 IEEE80211_QUEUE_STOP_REASON_CSA); 513 } 514 ch_switch.channel = new_ch; 515 ch_switch.count = sw_elem->count; 516 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 517 drv_channel_switch(sdata->local, &ch_switch); 518 return; 519 } 520 521 /* channel switch handled in software */ 522 if (sw_elem->count <= 1) { 523 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 524 } else { 525 if (sw_elem->mode) 526 ieee80211_stop_queues_by_reason(&sdata->local->hw, 527 IEEE80211_QUEUE_STOP_REASON_CSA); 528 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 529 mod_timer(&ifmgd->chswitch_timer, 530 jiffies + 531 msecs_to_jiffies(sw_elem->count * 532 cbss->beacon_interval)); 533 } 534 } 535 536 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 537 u16 capab_info, u8 *pwr_constr_elem, 538 u8 pwr_constr_elem_len) 539 { 540 struct ieee80211_conf *conf = &sdata->local->hw.conf; 541 542 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 543 return; 544 545 /* Power constraint IE length should be 1 octet */ 546 if (pwr_constr_elem_len != 1) 547 return; 548 549 if ((*pwr_constr_elem <= conf->channel->max_power) && 550 (*pwr_constr_elem != sdata->local->power_constr_level)) { 551 sdata->local->power_constr_level = *pwr_constr_elem; 552 ieee80211_hw_config(sdata->local, 0); 553 } 554 } 555 556 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 557 { 558 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 559 struct ieee80211_local *local = sdata->local; 560 struct ieee80211_conf *conf = &local->hw.conf; 561 562 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 563 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 564 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 565 566 local->disable_dynamic_ps = false; 567 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 568 } 569 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 570 571 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 572 { 573 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 574 struct ieee80211_local *local = sdata->local; 575 struct ieee80211_conf *conf = &local->hw.conf; 576 577 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 578 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 579 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 580 581 local->disable_dynamic_ps = true; 582 conf->dynamic_ps_timeout = 0; 583 del_timer_sync(&local->dynamic_ps_timer); 584 ieee80211_queue_work(&local->hw, 585 &local->dynamic_ps_enable_work); 586 } 587 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 588 589 /* powersave */ 590 static void ieee80211_enable_ps(struct ieee80211_local *local, 591 struct ieee80211_sub_if_data *sdata) 592 { 593 struct ieee80211_conf *conf = &local->hw.conf; 594 595 /* 596 * If we are scanning right now then the parameters will 597 * take effect when scan finishes. 598 */ 599 if (local->scanning) 600 return; 601 602 if (conf->dynamic_ps_timeout > 0 && 603 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 604 mod_timer(&local->dynamic_ps_timer, jiffies + 605 msecs_to_jiffies(conf->dynamic_ps_timeout)); 606 } else { 607 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 608 ieee80211_send_nullfunc(local, sdata, 1); 609 610 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 611 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 612 return; 613 614 conf->flags |= IEEE80211_CONF_PS; 615 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 616 } 617 } 618 619 static void ieee80211_change_ps(struct ieee80211_local *local) 620 { 621 struct ieee80211_conf *conf = &local->hw.conf; 622 623 if (local->ps_sdata) { 624 ieee80211_enable_ps(local, local->ps_sdata); 625 } else if (conf->flags & IEEE80211_CONF_PS) { 626 conf->flags &= ~IEEE80211_CONF_PS; 627 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 628 del_timer_sync(&local->dynamic_ps_timer); 629 cancel_work_sync(&local->dynamic_ps_enable_work); 630 } 631 } 632 633 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 634 { 635 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 636 struct sta_info *sta = NULL; 637 bool authorized = false; 638 639 if (!mgd->powersave) 640 return false; 641 642 if (!mgd->associated) 643 return false; 644 645 if (!mgd->associated->beacon_ies) 646 return false; 647 648 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 649 IEEE80211_STA_CONNECTION_POLL)) 650 return false; 651 652 rcu_read_lock(); 653 sta = sta_info_get(sdata, mgd->bssid); 654 if (sta) 655 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 656 rcu_read_unlock(); 657 658 return authorized; 659 } 660 661 /* need to hold RTNL or interface lock */ 662 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 663 { 664 struct ieee80211_sub_if_data *sdata, *found = NULL; 665 int count = 0; 666 int timeout; 667 668 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 669 local->ps_sdata = NULL; 670 return; 671 } 672 673 if (!list_empty(&local->work_list)) { 674 local->ps_sdata = NULL; 675 goto change; 676 } 677 678 list_for_each_entry(sdata, &local->interfaces, list) { 679 if (!ieee80211_sdata_running(sdata)) 680 continue; 681 if (sdata->vif.type == NL80211_IFTYPE_AP) { 682 /* If an AP vif is found, then disable PS 683 * by setting the count to zero thereby setting 684 * ps_sdata to NULL. 685 */ 686 count = 0; 687 break; 688 } 689 if (sdata->vif.type != NL80211_IFTYPE_STATION) 690 continue; 691 found = sdata; 692 count++; 693 } 694 695 if (count == 1 && ieee80211_powersave_allowed(found)) { 696 struct ieee80211_conf *conf = &local->hw.conf; 697 s32 beaconint_us; 698 699 if (latency < 0) 700 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 701 702 beaconint_us = ieee80211_tu_to_usec( 703 found->vif.bss_conf.beacon_int); 704 705 timeout = local->dynamic_ps_forced_timeout; 706 if (timeout < 0) { 707 /* 708 * Go to full PSM if the user configures a very low 709 * latency requirement. 710 * The 2000 second value is there for compatibility 711 * until the PM_QOS_NETWORK_LATENCY is configured 712 * with real values. 713 */ 714 if (latency > (1900 * USEC_PER_MSEC) && 715 latency != (2000 * USEC_PER_SEC)) 716 timeout = 0; 717 else 718 timeout = 100; 719 } 720 local->dynamic_ps_user_timeout = timeout; 721 if (!local->disable_dynamic_ps) 722 conf->dynamic_ps_timeout = 723 local->dynamic_ps_user_timeout; 724 725 if (beaconint_us > latency) { 726 local->ps_sdata = NULL; 727 } else { 728 struct ieee80211_bss *bss; 729 int maxslp = 1; 730 u8 dtimper; 731 732 bss = (void *)found->u.mgd.associated->priv; 733 dtimper = bss->dtim_period; 734 735 /* If the TIM IE is invalid, pretend the value is 1 */ 736 if (!dtimper) 737 dtimper = 1; 738 else if (dtimper > 1) 739 maxslp = min_t(int, dtimper, 740 latency / beaconint_us); 741 742 local->hw.conf.max_sleep_period = maxslp; 743 local->hw.conf.ps_dtim_period = dtimper; 744 local->ps_sdata = found; 745 } 746 } else { 747 local->ps_sdata = NULL; 748 } 749 750 change: 751 ieee80211_change_ps(local); 752 } 753 754 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 755 { 756 struct ieee80211_local *local = 757 container_of(work, struct ieee80211_local, 758 dynamic_ps_disable_work); 759 760 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 761 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 762 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 763 } 764 765 ieee80211_wake_queues_by_reason(&local->hw, 766 IEEE80211_QUEUE_STOP_REASON_PS); 767 } 768 769 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 770 { 771 struct ieee80211_local *local = 772 container_of(work, struct ieee80211_local, 773 dynamic_ps_enable_work); 774 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 775 struct ieee80211_if_managed *ifmgd; 776 unsigned long flags; 777 int q; 778 779 /* can only happen when PS was just disabled anyway */ 780 if (!sdata) 781 return; 782 783 ifmgd = &sdata->u.mgd; 784 785 if (local->hw.conf.flags & IEEE80211_CONF_PS) 786 return; 787 788 if (!local->disable_dynamic_ps && 789 local->hw.conf.dynamic_ps_timeout > 0) { 790 /* don't enter PS if TX frames are pending */ 791 if (drv_tx_frames_pending(local)) { 792 mod_timer(&local->dynamic_ps_timer, jiffies + 793 msecs_to_jiffies( 794 local->hw.conf.dynamic_ps_timeout)); 795 return; 796 } 797 798 /* 799 * transmission can be stopped by others which leads to 800 * dynamic_ps_timer expiry. Postpone the ps timer if it 801 * is not the actual idle state. 802 */ 803 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 804 for (q = 0; q < local->hw.queues; q++) { 805 if (local->queue_stop_reasons[q]) { 806 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 807 flags); 808 mod_timer(&local->dynamic_ps_timer, jiffies + 809 msecs_to_jiffies( 810 local->hw.conf.dynamic_ps_timeout)); 811 return; 812 } 813 } 814 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 815 } 816 817 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 818 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) { 819 netif_tx_stop_all_queues(sdata->dev); 820 821 if (drv_tx_frames_pending(local)) 822 mod_timer(&local->dynamic_ps_timer, jiffies + 823 msecs_to_jiffies( 824 local->hw.conf.dynamic_ps_timeout)); 825 else { 826 ieee80211_send_nullfunc(local, sdata, 1); 827 /* Flush to get the tx status of nullfunc frame */ 828 drv_flush(local, false); 829 } 830 } 831 832 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 833 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 834 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 835 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 836 local->hw.conf.flags |= IEEE80211_CONF_PS; 837 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 838 } 839 840 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 841 netif_tx_wake_all_queues(sdata->dev); 842 } 843 844 void ieee80211_dynamic_ps_timer(unsigned long data) 845 { 846 struct ieee80211_local *local = (void *) data; 847 848 if (local->quiescing || local->suspended) 849 return; 850 851 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 852 } 853 854 /* MLME */ 855 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 856 struct ieee80211_sub_if_data *sdata, 857 u8 *wmm_param, size_t wmm_param_len) 858 { 859 struct ieee80211_tx_queue_params params; 860 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 861 size_t left; 862 int count; 863 u8 *pos, uapsd_queues = 0; 864 865 if (!local->ops->conf_tx) 866 return; 867 868 if (local->hw.queues < 4) 869 return; 870 871 if (!wmm_param) 872 return; 873 874 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 875 return; 876 877 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 878 uapsd_queues = local->uapsd_queues; 879 880 count = wmm_param[6] & 0x0f; 881 if (count == ifmgd->wmm_last_param_set) 882 return; 883 ifmgd->wmm_last_param_set = count; 884 885 pos = wmm_param + 8; 886 left = wmm_param_len - 8; 887 888 memset(¶ms, 0, sizeof(params)); 889 890 local->wmm_acm = 0; 891 for (; left >= 4; left -= 4, pos += 4) { 892 int aci = (pos[0] >> 5) & 0x03; 893 int acm = (pos[0] >> 4) & 0x01; 894 bool uapsd = false; 895 int queue; 896 897 switch (aci) { 898 case 1: /* AC_BK */ 899 queue = 3; 900 if (acm) 901 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 902 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 903 uapsd = true; 904 break; 905 case 2: /* AC_VI */ 906 queue = 1; 907 if (acm) 908 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 909 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 910 uapsd = true; 911 break; 912 case 3: /* AC_VO */ 913 queue = 0; 914 if (acm) 915 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 916 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 917 uapsd = true; 918 break; 919 case 0: /* AC_BE */ 920 default: 921 queue = 2; 922 if (acm) 923 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 924 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 925 uapsd = true; 926 break; 927 } 928 929 params.aifs = pos[0] & 0x0f; 930 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 931 params.cw_min = ecw2cw(pos[1] & 0x0f); 932 params.txop = get_unaligned_le16(pos + 2); 933 params.uapsd = uapsd; 934 935 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 936 wiphy_debug(local->hw.wiphy, 937 "WMM queue=%d aci=%d acm=%d aifs=%d " 938 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 939 queue, aci, acm, 940 params.aifs, params.cw_min, params.cw_max, 941 params.txop, params.uapsd); 942 #endif 943 sdata->tx_conf[queue] = params; 944 if (drv_conf_tx(local, sdata, queue, ¶ms)) 945 wiphy_debug(local->hw.wiphy, 946 "failed to set TX queue parameters for queue %d\n", 947 queue); 948 } 949 950 /* enable WMM or activate new settings */ 951 sdata->vif.bss_conf.qos = true; 952 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 953 } 954 955 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 956 u16 capab, bool erp_valid, u8 erp) 957 { 958 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 959 u32 changed = 0; 960 bool use_protection; 961 bool use_short_preamble; 962 bool use_short_slot; 963 964 if (erp_valid) { 965 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 966 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 967 } else { 968 use_protection = false; 969 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 970 } 971 972 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 973 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 974 use_short_slot = true; 975 976 if (use_protection != bss_conf->use_cts_prot) { 977 bss_conf->use_cts_prot = use_protection; 978 changed |= BSS_CHANGED_ERP_CTS_PROT; 979 } 980 981 if (use_short_preamble != bss_conf->use_short_preamble) { 982 bss_conf->use_short_preamble = use_short_preamble; 983 changed |= BSS_CHANGED_ERP_PREAMBLE; 984 } 985 986 if (use_short_slot != bss_conf->use_short_slot) { 987 bss_conf->use_short_slot = use_short_slot; 988 changed |= BSS_CHANGED_ERP_SLOT; 989 } 990 991 return changed; 992 } 993 994 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 995 struct cfg80211_bss *cbss, 996 u32 bss_info_changed) 997 { 998 struct ieee80211_bss *bss = (void *)cbss->priv; 999 struct ieee80211_local *local = sdata->local; 1000 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1001 1002 bss_info_changed |= BSS_CHANGED_ASSOC; 1003 /* set timing information */ 1004 bss_conf->beacon_int = cbss->beacon_interval; 1005 bss_conf->timestamp = cbss->tsf; 1006 1007 bss_info_changed |= BSS_CHANGED_BEACON_INT; 1008 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1009 cbss->capability, bss->has_erp_value, bss->erp_value); 1010 1011 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1012 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1013 1014 sdata->u.mgd.associated = cbss; 1015 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1016 1017 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1018 1019 /* just to be sure */ 1020 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1021 IEEE80211_STA_BEACON_POLL); 1022 1023 ieee80211_led_assoc(local, 1); 1024 1025 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1026 bss_conf->dtim_period = bss->dtim_period; 1027 else 1028 bss_conf->dtim_period = 0; 1029 1030 bss_conf->assoc = 1; 1031 /* 1032 * For now just always ask the driver to update the basic rateset 1033 * when we have associated, we aren't checking whether it actually 1034 * changed or not. 1035 */ 1036 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 1037 1038 /* And the BSSID changed - we're associated now */ 1039 bss_info_changed |= BSS_CHANGED_BSSID; 1040 1041 /* Tell the driver to monitor connection quality (if supported) */ 1042 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) && 1043 bss_conf->cqm_rssi_thold) 1044 bss_info_changed |= BSS_CHANGED_CQM; 1045 1046 /* Enable ARP filtering */ 1047 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1048 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1049 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1050 } 1051 1052 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1053 1054 mutex_lock(&local->iflist_mtx); 1055 ieee80211_recalc_ps(local, -1); 1056 ieee80211_recalc_smps(local); 1057 mutex_unlock(&local->iflist_mtx); 1058 1059 netif_tx_start_all_queues(sdata->dev); 1060 netif_carrier_on(sdata->dev); 1061 } 1062 1063 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1064 bool remove_sta, bool tx) 1065 { 1066 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1067 struct ieee80211_local *local = sdata->local; 1068 struct sta_info *sta; 1069 u32 changed = 0, config_changed = 0; 1070 u8 bssid[ETH_ALEN]; 1071 1072 ASSERT_MGD_MTX(ifmgd); 1073 1074 if (WARN_ON(!ifmgd->associated)) 1075 return; 1076 1077 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1078 1079 ifmgd->associated = NULL; 1080 memset(ifmgd->bssid, 0, ETH_ALEN); 1081 1082 /* 1083 * we need to commit the associated = NULL change because the 1084 * scan code uses that to determine whether this iface should 1085 * go to/wake up from powersave or not -- and could otherwise 1086 * wake the queues erroneously. 1087 */ 1088 smp_mb(); 1089 1090 /* 1091 * Thus, we can only afterwards stop the queues -- to account 1092 * for the case where another CPU is finishing a scan at this 1093 * time -- we don't want the scan code to enable queues. 1094 */ 1095 1096 netif_tx_stop_all_queues(sdata->dev); 1097 netif_carrier_off(sdata->dev); 1098 1099 mutex_lock(&local->sta_mtx); 1100 sta = sta_info_get(sdata, bssid); 1101 if (sta) { 1102 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 1103 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1104 } 1105 mutex_unlock(&local->sta_mtx); 1106 1107 changed |= ieee80211_reset_erp_info(sdata); 1108 1109 ieee80211_led_assoc(local, 0); 1110 changed |= BSS_CHANGED_ASSOC; 1111 sdata->vif.bss_conf.assoc = false; 1112 1113 ieee80211_set_wmm_default(sdata); 1114 1115 /* channel(_type) changes are handled by ieee80211_hw_config */ 1116 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1117 1118 /* on the next assoc, re-program HT parameters */ 1119 sdata->ht_opmode_valid = false; 1120 1121 local->power_constr_level = 0; 1122 1123 del_timer_sync(&local->dynamic_ps_timer); 1124 cancel_work_sync(&local->dynamic_ps_enable_work); 1125 1126 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1127 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1128 config_changed |= IEEE80211_CONF_CHANGE_PS; 1129 } 1130 local->ps_sdata = NULL; 1131 1132 ieee80211_hw_config(local, config_changed); 1133 1134 /* Disable ARP filtering */ 1135 if (sdata->vif.bss_conf.arp_filter_enabled) { 1136 sdata->vif.bss_conf.arp_filter_enabled = false; 1137 changed |= BSS_CHANGED_ARP_FILTER; 1138 } 1139 1140 /* The BSSID (not really interesting) and HT changed */ 1141 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1142 ieee80211_bss_info_change_notify(sdata, changed); 1143 1144 /* remove AP and TDLS peers */ 1145 if (remove_sta) 1146 sta_info_flush(local, sdata); 1147 1148 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1149 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1150 del_timer_sync(&sdata->u.mgd.timer); 1151 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1152 } 1153 1154 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1155 struct ieee80211_hdr *hdr) 1156 { 1157 /* 1158 * We can postpone the mgd.timer whenever receiving unicast frames 1159 * from AP because we know that the connection is working both ways 1160 * at that time. But multicast frames (and hence also beacons) must 1161 * be ignored here, because we need to trigger the timer during 1162 * data idle periods for sending the periodic probe request to the 1163 * AP we're connected to. 1164 */ 1165 if (is_multicast_ether_addr(hdr->addr1)) 1166 return; 1167 1168 ieee80211_sta_reset_conn_monitor(sdata); 1169 } 1170 1171 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1172 { 1173 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1174 1175 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1176 IEEE80211_STA_CONNECTION_POLL))) 1177 return; 1178 1179 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1180 IEEE80211_STA_BEACON_POLL); 1181 mutex_lock(&sdata->local->iflist_mtx); 1182 ieee80211_recalc_ps(sdata->local, -1); 1183 mutex_unlock(&sdata->local->iflist_mtx); 1184 1185 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1186 return; 1187 1188 /* 1189 * We've received a probe response, but are not sure whether 1190 * we have or will be receiving any beacons or data, so let's 1191 * schedule the timers again, just in case. 1192 */ 1193 ieee80211_sta_reset_beacon_monitor(sdata); 1194 1195 mod_timer(&ifmgd->conn_mon_timer, 1196 round_jiffies_up(jiffies + 1197 IEEE80211_CONNECTION_IDLE_TIME)); 1198 } 1199 1200 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1201 struct ieee80211_hdr *hdr, bool ack) 1202 { 1203 if (!ieee80211_is_data(hdr->frame_control)) 1204 return; 1205 1206 if (ack) 1207 ieee80211_sta_reset_conn_monitor(sdata); 1208 1209 if (ieee80211_is_nullfunc(hdr->frame_control) && 1210 sdata->u.mgd.probe_send_count > 0) { 1211 if (ack) 1212 sdata->u.mgd.probe_send_count = 0; 1213 else 1214 sdata->u.mgd.nullfunc_failed = true; 1215 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1216 } 1217 } 1218 1219 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1220 { 1221 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1222 const u8 *ssid; 1223 u8 *dst = ifmgd->associated->bssid; 1224 u8 unicast_limit = max(1, max_probe_tries - 3); 1225 1226 /* 1227 * Try sending broadcast probe requests for the last three 1228 * probe requests after the first ones failed since some 1229 * buggy APs only support broadcast probe requests. 1230 */ 1231 if (ifmgd->probe_send_count >= unicast_limit) 1232 dst = NULL; 1233 1234 /* 1235 * When the hardware reports an accurate Tx ACK status, it's 1236 * better to send a nullfunc frame instead of a probe request, 1237 * as it will kick us off the AP quickly if we aren't associated 1238 * anymore. The timeout will be reset if the frame is ACKed by 1239 * the AP. 1240 */ 1241 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1242 ifmgd->nullfunc_failed = false; 1243 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1244 } else { 1245 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1246 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0, 1247 (u32) -1, true, false); 1248 } 1249 1250 ifmgd->probe_send_count++; 1251 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1252 run_again(ifmgd, ifmgd->probe_timeout); 1253 } 1254 1255 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1256 bool beacon) 1257 { 1258 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1259 bool already = false; 1260 1261 if (!ieee80211_sdata_running(sdata)) 1262 return; 1263 1264 if (sdata->local->scanning) 1265 return; 1266 1267 if (sdata->local->tmp_channel) 1268 return; 1269 1270 mutex_lock(&ifmgd->mtx); 1271 1272 if (!ifmgd->associated) 1273 goto out; 1274 1275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1276 if (beacon && net_ratelimit()) 1277 printk(KERN_DEBUG "%s: detected beacon loss from AP " 1278 "- sending probe request\n", sdata->name); 1279 #endif 1280 1281 /* 1282 * The driver/our work has already reported this event or the 1283 * connection monitoring has kicked in and we have already sent 1284 * a probe request. Or maybe the AP died and the driver keeps 1285 * reporting until we disassociate... 1286 * 1287 * In either case we have to ignore the current call to this 1288 * function (except for setting the correct probe reason bit) 1289 * because otherwise we would reset the timer every time and 1290 * never check whether we received a probe response! 1291 */ 1292 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1293 IEEE80211_STA_CONNECTION_POLL)) 1294 already = true; 1295 1296 if (beacon) 1297 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1298 else 1299 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1300 1301 if (already) 1302 goto out; 1303 1304 mutex_lock(&sdata->local->iflist_mtx); 1305 ieee80211_recalc_ps(sdata->local, -1); 1306 mutex_unlock(&sdata->local->iflist_mtx); 1307 1308 ifmgd->probe_send_count = 0; 1309 ieee80211_mgd_probe_ap_send(sdata); 1310 out: 1311 mutex_unlock(&ifmgd->mtx); 1312 } 1313 1314 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1315 struct ieee80211_vif *vif) 1316 { 1317 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1318 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1319 struct sk_buff *skb; 1320 const u8 *ssid; 1321 1322 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1323 return NULL; 1324 1325 ASSERT_MGD_MTX(ifmgd); 1326 1327 if (!ifmgd->associated) 1328 return NULL; 1329 1330 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1331 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1332 (u32) -1, ssid + 2, ssid[1], 1333 NULL, 0, true); 1334 1335 return skb; 1336 } 1337 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1338 1339 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1340 { 1341 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1342 struct ieee80211_local *local = sdata->local; 1343 u8 bssid[ETH_ALEN]; 1344 1345 mutex_lock(&ifmgd->mtx); 1346 if (!ifmgd->associated) { 1347 mutex_unlock(&ifmgd->mtx); 1348 return; 1349 } 1350 1351 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1352 1353 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1354 sdata->name, bssid); 1355 1356 ieee80211_set_disassoc(sdata, true, true); 1357 mutex_unlock(&ifmgd->mtx); 1358 1359 mutex_lock(&local->mtx); 1360 ieee80211_recalc_idle(local); 1361 mutex_unlock(&local->mtx); 1362 /* 1363 * must be outside lock due to cfg80211, 1364 * but that's not a problem. 1365 */ 1366 ieee80211_send_deauth_disassoc(sdata, bssid, 1367 IEEE80211_STYPE_DEAUTH, 1368 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1369 NULL, true); 1370 } 1371 1372 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1373 { 1374 struct ieee80211_sub_if_data *sdata = 1375 container_of(work, struct ieee80211_sub_if_data, 1376 u.mgd.beacon_connection_loss_work); 1377 1378 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1379 __ieee80211_connection_loss(sdata); 1380 else 1381 ieee80211_mgd_probe_ap(sdata, true); 1382 } 1383 1384 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1385 { 1386 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1387 struct ieee80211_hw *hw = &sdata->local->hw; 1388 1389 trace_api_beacon_loss(sdata); 1390 1391 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1392 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1393 } 1394 EXPORT_SYMBOL(ieee80211_beacon_loss); 1395 1396 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1397 { 1398 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1399 struct ieee80211_hw *hw = &sdata->local->hw; 1400 1401 trace_api_connection_loss(sdata); 1402 1403 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1404 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1405 } 1406 EXPORT_SYMBOL(ieee80211_connection_loss); 1407 1408 1409 static enum rx_mgmt_action __must_check 1410 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1411 struct ieee80211_mgmt *mgmt, size_t len) 1412 { 1413 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1414 const u8 *bssid = NULL; 1415 u16 reason_code; 1416 1417 if (len < 24 + 2) 1418 return RX_MGMT_NONE; 1419 1420 ASSERT_MGD_MTX(ifmgd); 1421 1422 bssid = ifmgd->associated->bssid; 1423 1424 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1425 1426 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1427 sdata->name, bssid, reason_code); 1428 1429 ieee80211_set_disassoc(sdata, true, false); 1430 mutex_lock(&sdata->local->mtx); 1431 ieee80211_recalc_idle(sdata->local); 1432 mutex_unlock(&sdata->local->mtx); 1433 1434 return RX_MGMT_CFG80211_DEAUTH; 1435 } 1436 1437 1438 static enum rx_mgmt_action __must_check 1439 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1440 struct ieee80211_mgmt *mgmt, size_t len) 1441 { 1442 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1443 u16 reason_code; 1444 1445 if (len < 24 + 2) 1446 return RX_MGMT_NONE; 1447 1448 ASSERT_MGD_MTX(ifmgd); 1449 1450 if (WARN_ON(!ifmgd->associated)) 1451 return RX_MGMT_NONE; 1452 1453 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN))) 1454 return RX_MGMT_NONE; 1455 1456 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1457 1458 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1459 sdata->name, mgmt->sa, reason_code); 1460 1461 ieee80211_set_disassoc(sdata, true, false); 1462 mutex_lock(&sdata->local->mtx); 1463 ieee80211_recalc_idle(sdata->local); 1464 mutex_unlock(&sdata->local->mtx); 1465 return RX_MGMT_CFG80211_DISASSOC; 1466 } 1467 1468 1469 static bool ieee80211_assoc_success(struct ieee80211_work *wk, 1470 struct ieee80211_mgmt *mgmt, size_t len) 1471 { 1472 struct ieee80211_sub_if_data *sdata = wk->sdata; 1473 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1474 struct ieee80211_local *local = sdata->local; 1475 struct ieee80211_supported_band *sband; 1476 struct sta_info *sta; 1477 struct cfg80211_bss *cbss = wk->assoc.bss; 1478 u8 *pos; 1479 u32 rates, basic_rates; 1480 u16 capab_info, aid; 1481 struct ieee802_11_elems elems; 1482 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1483 u32 changed = 0; 1484 int i, j, err; 1485 bool have_higher_than_11mbit = false; 1486 u16 ap_ht_cap_flags; 1487 1488 /* AssocResp and ReassocResp have identical structure */ 1489 1490 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1491 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1492 1493 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1494 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1495 "set\n", sdata->name, aid); 1496 aid &= ~(BIT(15) | BIT(14)); 1497 1498 pos = mgmt->u.assoc_resp.variable; 1499 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1500 1501 if (!elems.supp_rates) { 1502 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1503 sdata->name); 1504 return false; 1505 } 1506 1507 ifmgd->aid = aid; 1508 1509 mutex_lock(&sdata->local->sta_mtx); 1510 /* 1511 * station info was already allocated and inserted before 1512 * the association and should be available to us 1513 */ 1514 sta = sta_info_get_rx(sdata, cbss->bssid); 1515 if (WARN_ON(!sta)) { 1516 mutex_unlock(&sdata->local->sta_mtx); 1517 return false; 1518 } 1519 1520 set_sta_flag(sta, WLAN_STA_AUTH); 1521 set_sta_flag(sta, WLAN_STA_ASSOC); 1522 set_sta_flag(sta, WLAN_STA_ASSOC_AP); 1523 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 1524 set_sta_flag(sta, WLAN_STA_AUTHORIZED); 1525 1526 rates = 0; 1527 basic_rates = 0; 1528 sband = local->hw.wiphy->bands[wk->chan->band]; 1529 1530 for (i = 0; i < elems.supp_rates_len; i++) { 1531 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1532 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1533 1534 if (rate > 110) 1535 have_higher_than_11mbit = true; 1536 1537 for (j = 0; j < sband->n_bitrates; j++) { 1538 if (sband->bitrates[j].bitrate == rate) { 1539 rates |= BIT(j); 1540 if (is_basic) 1541 basic_rates |= BIT(j); 1542 break; 1543 } 1544 } 1545 } 1546 1547 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1548 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1549 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); 1550 1551 if (rate > 110) 1552 have_higher_than_11mbit = true; 1553 1554 for (j = 0; j < sband->n_bitrates; j++) { 1555 if (sband->bitrates[j].bitrate == rate) { 1556 rates |= BIT(j); 1557 if (is_basic) 1558 basic_rates |= BIT(j); 1559 break; 1560 } 1561 } 1562 } 1563 1564 sta->sta.supp_rates[wk->chan->band] = rates; 1565 sdata->vif.bss_conf.basic_rates = basic_rates; 1566 1567 /* cf. IEEE 802.11 9.2.12 */ 1568 if (wk->chan->band == IEEE80211_BAND_2GHZ && 1569 have_higher_than_11mbit) 1570 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1571 else 1572 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1573 1574 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1575 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1576 elems.ht_cap_elem, &sta->sta.ht_cap); 1577 1578 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1579 1580 rate_control_rate_init(sta); 1581 1582 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 1583 set_sta_flag(sta, WLAN_STA_MFP); 1584 1585 if (elems.wmm_param) 1586 set_sta_flag(sta, WLAN_STA_WME); 1587 1588 /* sta_info_reinsert will also unlock the mutex lock */ 1589 err = sta_info_reinsert(sta); 1590 sta = NULL; 1591 if (err) { 1592 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1593 " the AP (error %d)\n", sdata->name, err); 1594 return false; 1595 } 1596 1597 /* 1598 * Always handle WMM once after association regardless 1599 * of the first value the AP uses. Setting -1 here has 1600 * that effect because the AP values is an unsigned 1601 * 4-bit value. 1602 */ 1603 ifmgd->wmm_last_param_set = -1; 1604 1605 if (elems.wmm_param) 1606 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1607 elems.wmm_param_len); 1608 else 1609 ieee80211_set_wmm_default(sdata); 1610 1611 local->oper_channel = wk->chan; 1612 1613 if (elems.ht_info_elem && elems.wmm_param && 1614 (sdata->local->hw.queues >= 4) && 1615 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 1616 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1617 cbss->bssid, ap_ht_cap_flags, 1618 false); 1619 1620 /* set AID and assoc capability, 1621 * ieee80211_set_associated() will tell the driver */ 1622 bss_conf->aid = aid; 1623 bss_conf->assoc_capability = capab_info; 1624 ieee80211_set_associated(sdata, cbss, changed); 1625 1626 /* 1627 * If we're using 4-addr mode, let the AP know that we're 1628 * doing so, so that it can create the STA VLAN on its side 1629 */ 1630 if (ifmgd->use_4addr) 1631 ieee80211_send_4addr_nullfunc(local, sdata); 1632 1633 /* 1634 * Start timer to probe the connection to the AP now. 1635 * Also start the timer that will detect beacon loss. 1636 */ 1637 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 1638 ieee80211_sta_reset_beacon_monitor(sdata); 1639 1640 return true; 1641 } 1642 1643 1644 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1645 struct ieee80211_mgmt *mgmt, 1646 size_t len, 1647 struct ieee80211_rx_status *rx_status, 1648 struct ieee802_11_elems *elems, 1649 bool beacon) 1650 { 1651 struct ieee80211_local *local = sdata->local; 1652 int freq; 1653 struct ieee80211_bss *bss; 1654 struct ieee80211_channel *channel; 1655 bool need_ps = false; 1656 1657 if (sdata->u.mgd.associated) { 1658 bss = (void *)sdata->u.mgd.associated->priv; 1659 /* not previously set so we may need to recalc */ 1660 need_ps = !bss->dtim_period; 1661 } 1662 1663 if (elems->ds_params && elems->ds_params_len == 1) 1664 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 1665 rx_status->band); 1666 else 1667 freq = rx_status->freq; 1668 1669 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1670 1671 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1672 return; 1673 1674 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1675 channel, beacon); 1676 if (bss) 1677 ieee80211_rx_bss_put(local, bss); 1678 1679 if (!sdata->u.mgd.associated) 1680 return; 1681 1682 if (need_ps) { 1683 mutex_lock(&local->iflist_mtx); 1684 ieee80211_recalc_ps(local, -1); 1685 mutex_unlock(&local->iflist_mtx); 1686 } 1687 1688 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 1689 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 1690 ETH_ALEN) == 0)) { 1691 struct ieee80211_channel_sw_ie *sw_elem = 1692 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 1693 ieee80211_sta_process_chanswitch(sdata, sw_elem, 1694 bss, rx_status->mactime); 1695 } 1696 } 1697 1698 1699 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1700 struct sk_buff *skb) 1701 { 1702 struct ieee80211_mgmt *mgmt = (void *)skb->data; 1703 struct ieee80211_if_managed *ifmgd; 1704 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 1705 size_t baselen, len = skb->len; 1706 struct ieee802_11_elems elems; 1707 1708 ifmgd = &sdata->u.mgd; 1709 1710 ASSERT_MGD_MTX(ifmgd); 1711 1712 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) 1713 return; /* ignore ProbeResp to foreign address */ 1714 1715 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1716 if (baselen > len) 1717 return; 1718 1719 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1720 &elems); 1721 1722 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1723 1724 if (ifmgd->associated && 1725 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0) 1726 ieee80211_reset_ap_probe(sdata); 1727 } 1728 1729 /* 1730 * This is the canonical list of information elements we care about, 1731 * the filter code also gives us all changes to the Microsoft OUI 1732 * (00:50:F2) vendor IE which is used for WMM which we need to track. 1733 * 1734 * We implement beacon filtering in software since that means we can 1735 * avoid processing the frame here and in cfg80211, and userspace 1736 * will not be able to tell whether the hardware supports it or not. 1737 * 1738 * XXX: This list needs to be dynamic -- userspace needs to be able to 1739 * add items it requires. It also needs to be able to tell us to 1740 * look out for other vendor IEs. 1741 */ 1742 static const u64 care_about_ies = 1743 (1ULL << WLAN_EID_COUNTRY) | 1744 (1ULL << WLAN_EID_ERP_INFO) | 1745 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 1746 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 1747 (1ULL << WLAN_EID_HT_CAPABILITY) | 1748 (1ULL << WLAN_EID_HT_INFORMATION); 1749 1750 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1751 struct ieee80211_mgmt *mgmt, 1752 size_t len, 1753 struct ieee80211_rx_status *rx_status) 1754 { 1755 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1756 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1757 size_t baselen; 1758 struct ieee802_11_elems elems; 1759 struct ieee80211_local *local = sdata->local; 1760 u32 changed = 0; 1761 bool erp_valid, directed_tim = false; 1762 u8 erp_value = 0; 1763 u32 ncrc; 1764 u8 *bssid; 1765 1766 ASSERT_MGD_MTX(ifmgd); 1767 1768 /* Process beacon from the current BSS */ 1769 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1770 if (baselen > len) 1771 return; 1772 1773 if (rx_status->freq != local->hw.conf.channel->center_freq) 1774 return; 1775 1776 /* 1777 * We might have received a number of frames, among them a 1778 * disassoc frame and a beacon... 1779 */ 1780 if (!ifmgd->associated) 1781 return; 1782 1783 bssid = ifmgd->associated->bssid; 1784 1785 /* 1786 * And in theory even frames from a different AP we were just 1787 * associated to a split-second ago! 1788 */ 1789 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0) 1790 return; 1791 1792 /* Track average RSSI from the Beacon frames of the current AP */ 1793 ifmgd->last_beacon_signal = rx_status->signal; 1794 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 1795 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 1796 ifmgd->ave_beacon_signal = rx_status->signal * 16; 1797 ifmgd->last_cqm_event_signal = 0; 1798 ifmgd->count_beacon_signal = 1; 1799 ifmgd->last_ave_beacon_signal = 0; 1800 } else { 1801 ifmgd->ave_beacon_signal = 1802 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 1803 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 1804 ifmgd->ave_beacon_signal) / 16; 1805 ifmgd->count_beacon_signal++; 1806 } 1807 1808 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 1809 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 1810 int sig = ifmgd->ave_beacon_signal; 1811 int last_sig = ifmgd->last_ave_beacon_signal; 1812 1813 /* 1814 * if signal crosses either of the boundaries, invoke callback 1815 * with appropriate parameters 1816 */ 1817 if (sig > ifmgd->rssi_max_thold && 1818 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 1819 ifmgd->last_ave_beacon_signal = sig; 1820 drv_rssi_callback(local, RSSI_EVENT_HIGH); 1821 } else if (sig < ifmgd->rssi_min_thold && 1822 (last_sig >= ifmgd->rssi_max_thold || 1823 last_sig == 0)) { 1824 ifmgd->last_ave_beacon_signal = sig; 1825 drv_rssi_callback(local, RSSI_EVENT_LOW); 1826 } 1827 } 1828 1829 if (bss_conf->cqm_rssi_thold && 1830 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 1831 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) { 1832 int sig = ifmgd->ave_beacon_signal / 16; 1833 int last_event = ifmgd->last_cqm_event_signal; 1834 int thold = bss_conf->cqm_rssi_thold; 1835 int hyst = bss_conf->cqm_rssi_hyst; 1836 if (sig < thold && 1837 (last_event == 0 || sig < last_event - hyst)) { 1838 ifmgd->last_cqm_event_signal = sig; 1839 ieee80211_cqm_rssi_notify( 1840 &sdata->vif, 1841 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 1842 GFP_KERNEL); 1843 } else if (sig > thold && 1844 (last_event == 0 || sig > last_event + hyst)) { 1845 ifmgd->last_cqm_event_signal = sig; 1846 ieee80211_cqm_rssi_notify( 1847 &sdata->vif, 1848 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 1849 GFP_KERNEL); 1850 } 1851 } 1852 1853 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 1854 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1855 if (net_ratelimit()) { 1856 printk(KERN_DEBUG "%s: cancelling probereq poll due " 1857 "to a received beacon\n", sdata->name); 1858 } 1859 #endif 1860 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 1861 mutex_lock(&local->iflist_mtx); 1862 ieee80211_recalc_ps(local, -1); 1863 mutex_unlock(&local->iflist_mtx); 1864 } 1865 1866 /* 1867 * Push the beacon loss detection into the future since 1868 * we are processing a beacon from the AP just now. 1869 */ 1870 ieee80211_sta_reset_beacon_monitor(sdata); 1871 1872 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 1873 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 1874 len - baselen, &elems, 1875 care_about_ies, ncrc); 1876 1877 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1878 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 1879 ifmgd->aid); 1880 1881 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 1882 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 1883 true); 1884 1885 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 1886 elems.wmm_param_len); 1887 } 1888 1889 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 1890 if (directed_tim) { 1891 if (local->hw.conf.dynamic_ps_timeout > 0) { 1892 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1893 ieee80211_hw_config(local, 1894 IEEE80211_CONF_CHANGE_PS); 1895 ieee80211_send_nullfunc(local, sdata, 0); 1896 } else { 1897 local->pspolling = true; 1898 1899 /* 1900 * Here is assumed that the driver will be 1901 * able to send ps-poll frame and receive a 1902 * response even though power save mode is 1903 * enabled, but some drivers might require 1904 * to disable power save here. This needs 1905 * to be investigated. 1906 */ 1907 ieee80211_send_pspoll(local, sdata); 1908 } 1909 } 1910 } 1911 1912 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 1913 return; 1914 ifmgd->beacon_crc = ncrc; 1915 ifmgd->beacon_crc_valid = true; 1916 1917 if (elems.erp_info && elems.erp_info_len >= 1) { 1918 erp_valid = true; 1919 erp_value = elems.erp_info[0]; 1920 } else { 1921 erp_valid = false; 1922 } 1923 changed |= ieee80211_handle_bss_capability(sdata, 1924 le16_to_cpu(mgmt->u.beacon.capab_info), 1925 erp_valid, erp_value); 1926 1927 1928 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1929 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 1930 struct sta_info *sta; 1931 struct ieee80211_supported_band *sband; 1932 u16 ap_ht_cap_flags; 1933 1934 rcu_read_lock(); 1935 1936 sta = sta_info_get(sdata, bssid); 1937 if (WARN_ON(!sta)) { 1938 rcu_read_unlock(); 1939 return; 1940 } 1941 1942 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1943 1944 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1945 elems.ht_cap_elem, &sta->sta.ht_cap); 1946 1947 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1948 1949 rcu_read_unlock(); 1950 1951 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1952 bssid, ap_ht_cap_flags, true); 1953 } 1954 1955 /* Note: country IE parsing is done for us by cfg80211 */ 1956 if (elems.country_elem) { 1957 /* TODO: IBSS also needs this */ 1958 if (elems.pwr_constr_elem) 1959 ieee80211_handle_pwr_constr(sdata, 1960 le16_to_cpu(mgmt->u.probe_resp.capab_info), 1961 elems.pwr_constr_elem, 1962 elems.pwr_constr_elem_len); 1963 } 1964 1965 ieee80211_bss_info_change_notify(sdata, changed); 1966 } 1967 1968 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1969 struct sk_buff *skb) 1970 { 1971 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1972 struct ieee80211_rx_status *rx_status; 1973 struct ieee80211_mgmt *mgmt; 1974 enum rx_mgmt_action rma = RX_MGMT_NONE; 1975 u16 fc; 1976 1977 rx_status = (struct ieee80211_rx_status *) skb->cb; 1978 mgmt = (struct ieee80211_mgmt *) skb->data; 1979 fc = le16_to_cpu(mgmt->frame_control); 1980 1981 mutex_lock(&ifmgd->mtx); 1982 1983 if (ifmgd->associated && 1984 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) { 1985 switch (fc & IEEE80211_FCTL_STYPE) { 1986 case IEEE80211_STYPE_BEACON: 1987 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 1988 rx_status); 1989 break; 1990 case IEEE80211_STYPE_PROBE_RESP: 1991 ieee80211_rx_mgmt_probe_resp(sdata, skb); 1992 break; 1993 case IEEE80211_STYPE_DEAUTH: 1994 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 1995 break; 1996 case IEEE80211_STYPE_DISASSOC: 1997 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 1998 break; 1999 case IEEE80211_STYPE_ACTION: 2000 switch (mgmt->u.action.category) { 2001 case WLAN_CATEGORY_SPECTRUM_MGMT: 2002 ieee80211_sta_process_chanswitch(sdata, 2003 &mgmt->u.action.u.chan_switch.sw_elem, 2004 (void *)ifmgd->associated->priv, 2005 rx_status->mactime); 2006 break; 2007 } 2008 } 2009 mutex_unlock(&ifmgd->mtx); 2010 2011 switch (rma) { 2012 case RX_MGMT_NONE: 2013 /* no action */ 2014 break; 2015 case RX_MGMT_CFG80211_DEAUTH: 2016 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2017 break; 2018 case RX_MGMT_CFG80211_DISASSOC: 2019 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 2020 break; 2021 default: 2022 WARN(1, "unexpected: %d", rma); 2023 } 2024 return; 2025 } 2026 2027 mutex_unlock(&ifmgd->mtx); 2028 2029 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ && 2030 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) { 2031 struct ieee80211_local *local = sdata->local; 2032 struct ieee80211_work *wk; 2033 2034 mutex_lock(&local->mtx); 2035 list_for_each_entry(wk, &local->work_list, list) { 2036 if (wk->sdata != sdata) 2037 continue; 2038 2039 if (wk->type != IEEE80211_WORK_ASSOC && 2040 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2041 continue; 2042 2043 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN)) 2044 continue; 2045 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN)) 2046 continue; 2047 2048 /* 2049 * Printing the message only here means we can't 2050 * spuriously print it, but it also means that it 2051 * won't be printed when the frame comes in before 2052 * we even tried to associate or in similar cases. 2053 * 2054 * Ultimately, I suspect cfg80211 should print the 2055 * messages instead. 2056 */ 2057 printk(KERN_DEBUG 2058 "%s: deauthenticated from %pM (Reason: %u)\n", 2059 sdata->name, mgmt->bssid, 2060 le16_to_cpu(mgmt->u.deauth.reason_code)); 2061 2062 list_del_rcu(&wk->list); 2063 free_work(wk); 2064 break; 2065 } 2066 mutex_unlock(&local->mtx); 2067 2068 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2069 } 2070 } 2071 2072 static void ieee80211_sta_timer(unsigned long data) 2073 { 2074 struct ieee80211_sub_if_data *sdata = 2075 (struct ieee80211_sub_if_data *) data; 2076 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2077 struct ieee80211_local *local = sdata->local; 2078 2079 if (local->quiescing) { 2080 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2081 return; 2082 } 2083 2084 ieee80211_queue_work(&local->hw, &sdata->work); 2085 } 2086 2087 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2088 u8 *bssid, u8 reason) 2089 { 2090 struct ieee80211_local *local = sdata->local; 2091 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2092 2093 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2094 IEEE80211_STA_BEACON_POLL); 2095 2096 ieee80211_set_disassoc(sdata, true, true); 2097 mutex_unlock(&ifmgd->mtx); 2098 mutex_lock(&local->mtx); 2099 ieee80211_recalc_idle(local); 2100 mutex_unlock(&local->mtx); 2101 /* 2102 * must be outside lock due to cfg80211, 2103 * but that's not a problem. 2104 */ 2105 ieee80211_send_deauth_disassoc(sdata, bssid, 2106 IEEE80211_STYPE_DEAUTH, reason, 2107 NULL, true); 2108 mutex_lock(&ifmgd->mtx); 2109 } 2110 2111 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2112 { 2113 struct ieee80211_local *local = sdata->local; 2114 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2115 2116 /* then process the rest of the work */ 2117 mutex_lock(&ifmgd->mtx); 2118 2119 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2120 IEEE80211_STA_CONNECTION_POLL) && 2121 ifmgd->associated) { 2122 u8 bssid[ETH_ALEN]; 2123 int max_tries; 2124 2125 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2126 2127 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2128 max_tries = max_nullfunc_tries; 2129 else 2130 max_tries = max_probe_tries; 2131 2132 /* ACK received for nullfunc probing frame */ 2133 if (!ifmgd->probe_send_count) 2134 ieee80211_reset_ap_probe(sdata); 2135 else if (ifmgd->nullfunc_failed) { 2136 if (ifmgd->probe_send_count < max_tries) { 2137 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2138 wiphy_debug(local->hw.wiphy, 2139 "%s: No ack for nullfunc frame to" 2140 " AP %pM, try %d/%i\n", 2141 sdata->name, bssid, 2142 ifmgd->probe_send_count, max_tries); 2143 #endif 2144 ieee80211_mgd_probe_ap_send(sdata); 2145 } else { 2146 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2147 wiphy_debug(local->hw.wiphy, 2148 "%s: No ack for nullfunc frame to" 2149 " AP %pM, disconnecting.\n", 2150 sdata->name, bssid); 2151 #endif 2152 ieee80211_sta_connection_lost(sdata, bssid, 2153 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2154 } 2155 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2156 run_again(ifmgd, ifmgd->probe_timeout); 2157 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2159 wiphy_debug(local->hw.wiphy, 2160 "%s: Failed to send nullfunc to AP %pM" 2161 " after %dms, disconnecting.\n", 2162 sdata->name, 2163 bssid, probe_wait_ms); 2164 #endif 2165 ieee80211_sta_connection_lost(sdata, bssid, 2166 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2167 } else if (ifmgd->probe_send_count < max_tries) { 2168 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2169 wiphy_debug(local->hw.wiphy, 2170 "%s: No probe response from AP %pM" 2171 " after %dms, try %d/%i\n", 2172 sdata->name, 2173 bssid, probe_wait_ms, 2174 ifmgd->probe_send_count, max_tries); 2175 #endif 2176 ieee80211_mgd_probe_ap_send(sdata); 2177 } else { 2178 /* 2179 * We actually lost the connection ... or did we? 2180 * Let's make sure! 2181 */ 2182 wiphy_debug(local->hw.wiphy, 2183 "%s: No probe response from AP %pM" 2184 " after %dms, disconnecting.\n", 2185 sdata->name, 2186 bssid, probe_wait_ms); 2187 2188 ieee80211_sta_connection_lost(sdata, bssid, 2189 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2190 } 2191 } 2192 2193 mutex_unlock(&ifmgd->mtx); 2194 } 2195 2196 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2197 { 2198 struct ieee80211_sub_if_data *sdata = 2199 (struct ieee80211_sub_if_data *) data; 2200 struct ieee80211_local *local = sdata->local; 2201 2202 if (local->quiescing) 2203 return; 2204 2205 ieee80211_queue_work(&sdata->local->hw, 2206 &sdata->u.mgd.beacon_connection_loss_work); 2207 } 2208 2209 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2210 { 2211 struct ieee80211_sub_if_data *sdata = 2212 (struct ieee80211_sub_if_data *) data; 2213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2214 struct ieee80211_local *local = sdata->local; 2215 2216 if (local->quiescing) 2217 return; 2218 2219 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2220 } 2221 2222 static void ieee80211_sta_monitor_work(struct work_struct *work) 2223 { 2224 struct ieee80211_sub_if_data *sdata = 2225 container_of(work, struct ieee80211_sub_if_data, 2226 u.mgd.monitor_work); 2227 2228 ieee80211_mgd_probe_ap(sdata, false); 2229 } 2230 2231 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2232 { 2233 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2234 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2235 IEEE80211_STA_CONNECTION_POLL); 2236 2237 /* let's probe the connection once */ 2238 ieee80211_queue_work(&sdata->local->hw, 2239 &sdata->u.mgd.monitor_work); 2240 /* and do all the other regular work too */ 2241 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2242 } 2243 } 2244 2245 #ifdef CONFIG_PM 2246 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2247 { 2248 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2249 2250 /* 2251 * we need to use atomic bitops for the running bits 2252 * only because both timers might fire at the same 2253 * time -- the code here is properly synchronised. 2254 */ 2255 2256 cancel_work_sync(&ifmgd->request_smps_work); 2257 2258 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2259 if (del_timer_sync(&ifmgd->timer)) 2260 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2261 2262 cancel_work_sync(&ifmgd->chswitch_work); 2263 if (del_timer_sync(&ifmgd->chswitch_timer)) 2264 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2265 2266 cancel_work_sync(&ifmgd->monitor_work); 2267 /* these will just be re-established on connection */ 2268 del_timer_sync(&ifmgd->conn_mon_timer); 2269 del_timer_sync(&ifmgd->bcn_mon_timer); 2270 } 2271 2272 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2273 { 2274 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2275 2276 if (!ifmgd->associated) 2277 return; 2278 2279 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2280 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2281 mutex_lock(&ifmgd->mtx); 2282 if (ifmgd->associated) { 2283 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2284 wiphy_debug(sdata->local->hw.wiphy, 2285 "%s: driver requested disconnect after resume.\n", 2286 sdata->name); 2287 #endif 2288 ieee80211_sta_connection_lost(sdata, 2289 ifmgd->associated->bssid, 2290 WLAN_REASON_UNSPECIFIED); 2291 mutex_unlock(&ifmgd->mtx); 2292 return; 2293 } 2294 mutex_unlock(&ifmgd->mtx); 2295 } 2296 2297 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2298 add_timer(&ifmgd->timer); 2299 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2300 add_timer(&ifmgd->chswitch_timer); 2301 ieee80211_sta_reset_beacon_monitor(sdata); 2302 ieee80211_restart_sta_timer(sdata); 2303 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); 2304 } 2305 #endif 2306 2307 /* interface setup */ 2308 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2309 { 2310 struct ieee80211_if_managed *ifmgd; 2311 2312 ifmgd = &sdata->u.mgd; 2313 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2314 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2315 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2316 ieee80211_beacon_connection_loss_work); 2317 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2318 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2319 (unsigned long) sdata); 2320 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2321 (unsigned long) sdata); 2322 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2323 (unsigned long) sdata); 2324 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2325 (unsigned long) sdata); 2326 2327 ifmgd->flags = 0; 2328 2329 mutex_init(&ifmgd->mtx); 2330 2331 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2332 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2333 else 2334 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2335 } 2336 2337 /* scan finished notification */ 2338 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2339 { 2340 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2341 2342 /* Restart STA timers */ 2343 rcu_read_lock(); 2344 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2345 ieee80211_restart_sta_timer(sdata); 2346 rcu_read_unlock(); 2347 } 2348 2349 int ieee80211_max_network_latency(struct notifier_block *nb, 2350 unsigned long data, void *dummy) 2351 { 2352 s32 latency_usec = (s32) data; 2353 struct ieee80211_local *local = 2354 container_of(nb, struct ieee80211_local, 2355 network_latency_notifier); 2356 2357 mutex_lock(&local->iflist_mtx); 2358 ieee80211_recalc_ps(local, latency_usec); 2359 mutex_unlock(&local->iflist_mtx); 2360 2361 return 0; 2362 } 2363 2364 /* config hooks */ 2365 static enum work_done_result 2366 ieee80211_probe_auth_done(struct ieee80211_work *wk, 2367 struct sk_buff *skb) 2368 { 2369 struct ieee80211_local *local = wk->sdata->local; 2370 2371 if (!skb) { 2372 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta); 2373 goto destroy; 2374 } 2375 2376 if (wk->type == IEEE80211_WORK_AUTH) { 2377 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len); 2378 goto destroy; 2379 } 2380 2381 mutex_lock(&wk->sdata->u.mgd.mtx); 2382 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb); 2383 mutex_unlock(&wk->sdata->u.mgd.mtx); 2384 2385 wk->type = IEEE80211_WORK_AUTH; 2386 wk->probe_auth.tries = 0; 2387 return WORK_DONE_REQUEUE; 2388 destroy: 2389 if (wk->probe_auth.synced) 2390 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2391 IEEE80211_TX_SYNC_AUTH); 2392 2393 return WORK_DONE_DESTROY; 2394 } 2395 2396 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 2397 struct cfg80211_auth_request *req) 2398 { 2399 const u8 *ssid; 2400 struct ieee80211_work *wk; 2401 u16 auth_alg; 2402 2403 if (req->local_state_change) 2404 return 0; /* no need to update mac80211 state */ 2405 2406 switch (req->auth_type) { 2407 case NL80211_AUTHTYPE_OPEN_SYSTEM: 2408 auth_alg = WLAN_AUTH_OPEN; 2409 break; 2410 case NL80211_AUTHTYPE_SHARED_KEY: 2411 if (IS_ERR(sdata->local->wep_tx_tfm)) 2412 return -EOPNOTSUPP; 2413 auth_alg = WLAN_AUTH_SHARED_KEY; 2414 break; 2415 case NL80211_AUTHTYPE_FT: 2416 auth_alg = WLAN_AUTH_FT; 2417 break; 2418 case NL80211_AUTHTYPE_NETWORK_EAP: 2419 auth_alg = WLAN_AUTH_LEAP; 2420 break; 2421 default: 2422 return -EOPNOTSUPP; 2423 } 2424 2425 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2426 if (!wk) 2427 return -ENOMEM; 2428 2429 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2430 2431 if (req->ie && req->ie_len) { 2432 memcpy(wk->ie, req->ie, req->ie_len); 2433 wk->ie_len = req->ie_len; 2434 } 2435 2436 if (req->key && req->key_len) { 2437 wk->probe_auth.key_len = req->key_len; 2438 wk->probe_auth.key_idx = req->key_idx; 2439 memcpy(wk->probe_auth.key, req->key, req->key_len); 2440 } 2441 2442 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2443 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]); 2444 wk->probe_auth.ssid_len = ssid[1]; 2445 2446 wk->probe_auth.algorithm = auth_alg; 2447 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY; 2448 2449 /* if we already have a probe, don't probe again */ 2450 if (req->bss->proberesp_ies) 2451 wk->type = IEEE80211_WORK_AUTH; 2452 else 2453 wk->type = IEEE80211_WORK_DIRECT_PROBE; 2454 wk->chan = req->bss->channel; 2455 wk->chan_type = NL80211_CHAN_NO_HT; 2456 wk->sdata = sdata; 2457 wk->done = ieee80211_probe_auth_done; 2458 2459 ieee80211_add_work(wk); 2460 return 0; 2461 } 2462 2463 /* create and insert a dummy station entry */ 2464 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata, 2465 u8 *bssid) { 2466 struct sta_info *sta; 2467 int err; 2468 2469 sta = sta_info_alloc(sdata, bssid, GFP_KERNEL); 2470 if (!sta) 2471 return -ENOMEM; 2472 2473 sta->dummy = true; 2474 2475 err = sta_info_insert(sta); 2476 sta = NULL; 2477 if (err) { 2478 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for" 2479 " the AP (error %d)\n", sdata->name, err); 2480 return err; 2481 } 2482 2483 return 0; 2484 } 2485 2486 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk, 2487 struct sk_buff *skb) 2488 { 2489 struct ieee80211_local *local = wk->sdata->local; 2490 struct ieee80211_mgmt *mgmt; 2491 struct ieee80211_rx_status *rx_status; 2492 struct ieee802_11_elems elems; 2493 struct cfg80211_bss *cbss = wk->assoc.bss; 2494 u16 status; 2495 2496 if (!skb) { 2497 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2498 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta); 2499 goto destroy; 2500 } 2501 2502 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) { 2503 mutex_lock(&wk->sdata->u.mgd.mtx); 2504 rx_status = (void *) skb->cb; 2505 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems); 2506 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status, 2507 &elems, true); 2508 mutex_unlock(&wk->sdata->u.mgd.mtx); 2509 2510 wk->type = IEEE80211_WORK_ASSOC; 2511 /* not really done yet */ 2512 return WORK_DONE_REQUEUE; 2513 } 2514 2515 mgmt = (void *)skb->data; 2516 status = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2517 2518 if (status == WLAN_STATUS_SUCCESS) { 2519 if (wk->assoc.synced) 2520 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2521 IEEE80211_TX_SYNC_ASSOC); 2522 2523 mutex_lock(&wk->sdata->u.mgd.mtx); 2524 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) { 2525 mutex_unlock(&wk->sdata->u.mgd.mtx); 2526 /* oops -- internal error -- send timeout for now */ 2527 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2528 cfg80211_send_assoc_timeout(wk->sdata->dev, 2529 wk->filter_ta); 2530 return WORK_DONE_DESTROY; 2531 } 2532 2533 mutex_unlock(&wk->sdata->u.mgd.mtx); 2534 } else { 2535 /* assoc failed - destroy the dummy station entry */ 2536 sta_info_destroy_addr(wk->sdata, cbss->bssid); 2537 } 2538 2539 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len); 2540 destroy: 2541 if (wk->assoc.synced) 2542 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta, 2543 IEEE80211_TX_SYNC_ASSOC); 2544 2545 return WORK_DONE_DESTROY; 2546 } 2547 2548 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 2549 struct cfg80211_assoc_request *req) 2550 { 2551 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2552 struct ieee80211_bss *bss = (void *)req->bss->priv; 2553 struct ieee80211_work *wk; 2554 const u8 *ssid; 2555 int i, err; 2556 2557 mutex_lock(&ifmgd->mtx); 2558 if (ifmgd->associated) { 2559 if (!req->prev_bssid || 2560 memcmp(req->prev_bssid, ifmgd->associated->bssid, 2561 ETH_ALEN)) { 2562 /* 2563 * We are already associated and the request was not a 2564 * reassociation request from the current BSS, so 2565 * reject it. 2566 */ 2567 mutex_unlock(&ifmgd->mtx); 2568 return -EALREADY; 2569 } 2570 2571 /* Trying to reassociate - clear previous association state */ 2572 ieee80211_set_disassoc(sdata, true, false); 2573 } 2574 mutex_unlock(&ifmgd->mtx); 2575 2576 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL); 2577 if (!wk) 2578 return -ENOMEM; 2579 2580 /* 2581 * create a dummy station info entry in order 2582 * to start accepting incoming EAPOL packets from the station 2583 */ 2584 err = ieee80211_pre_assoc(sdata, req->bss->bssid); 2585 if (err) { 2586 kfree(wk); 2587 return err; 2588 } 2589 2590 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 2591 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 2592 2593 ifmgd->beacon_crc_valid = false; 2594 2595 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 2596 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 2597 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 2598 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 2599 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 2600 2601 2602 if (req->ie && req->ie_len) { 2603 memcpy(wk->ie, req->ie, req->ie_len); 2604 wk->ie_len = req->ie_len; 2605 } else 2606 wk->ie_len = 0; 2607 2608 wk->assoc.bss = req->bss; 2609 2610 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN); 2611 2612 /* new association always uses requested smps mode */ 2613 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 2614 if (ifmgd->powersave) 2615 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 2616 else 2617 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 2618 } else 2619 ifmgd->ap_smps = ifmgd->req_smps; 2620 2621 wk->assoc.smps = ifmgd->ap_smps; 2622 /* 2623 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 2624 * We still associate in non-HT mode (11a/b/g) if any one of these 2625 * ciphers is configured as pairwise. 2626 * We can set this to true for non-11n hardware, that'll be checked 2627 * separately along with the peer capabilities. 2628 */ 2629 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N); 2630 wk->assoc.capability = req->bss->capability; 2631 wk->assoc.wmm_used = bss->wmm_used; 2632 wk->assoc.supp_rates = bss->supp_rates; 2633 wk->assoc.supp_rates_len = bss->supp_rates_len; 2634 wk->assoc.ht_information_ie = 2635 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION); 2636 2637 if (bss->wmm_used && bss->uapsd_supported && 2638 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 2639 wk->assoc.uapsd_used = true; 2640 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 2641 } else { 2642 wk->assoc.uapsd_used = false; 2643 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 2644 } 2645 2646 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 2647 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]); 2648 wk->assoc.ssid_len = ssid[1]; 2649 2650 if (req->prev_bssid) 2651 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN); 2652 2653 wk->chan = req->bss->channel; 2654 wk->chan_type = NL80211_CHAN_NO_HT; 2655 wk->sdata = sdata; 2656 wk->done = ieee80211_assoc_done; 2657 if (!bss->dtim_period && 2658 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 2659 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT; 2660 else 2661 wk->type = IEEE80211_WORK_ASSOC; 2662 2663 if (req->use_mfp) { 2664 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 2665 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 2666 } else { 2667 ifmgd->mfp = IEEE80211_MFP_DISABLED; 2668 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 2669 } 2670 2671 if (req->crypto.control_port) 2672 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 2673 else 2674 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 2675 2676 sdata->control_port_protocol = req->crypto.control_port_ethertype; 2677 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 2678 2679 ieee80211_add_work(wk); 2680 return 0; 2681 } 2682 2683 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 2684 struct cfg80211_deauth_request *req, 2685 void *cookie) 2686 { 2687 struct ieee80211_local *local = sdata->local; 2688 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2689 struct ieee80211_work *wk; 2690 u8 bssid[ETH_ALEN]; 2691 bool assoc_bss = false; 2692 2693 mutex_lock(&ifmgd->mtx); 2694 2695 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2696 if (ifmgd->associated == req->bss) { 2697 ieee80211_set_disassoc(sdata, false, true); 2698 mutex_unlock(&ifmgd->mtx); 2699 assoc_bss = true; 2700 } else { 2701 bool not_auth_yet = false; 2702 2703 mutex_unlock(&ifmgd->mtx); 2704 2705 mutex_lock(&local->mtx); 2706 list_for_each_entry(wk, &local->work_list, list) { 2707 if (wk->sdata != sdata) 2708 continue; 2709 2710 if (wk->type != IEEE80211_WORK_DIRECT_PROBE && 2711 wk->type != IEEE80211_WORK_AUTH && 2712 wk->type != IEEE80211_WORK_ASSOC && 2713 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT) 2714 continue; 2715 2716 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN)) 2717 continue; 2718 2719 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE; 2720 list_del_rcu(&wk->list); 2721 free_work(wk); 2722 break; 2723 } 2724 mutex_unlock(&local->mtx); 2725 2726 /* 2727 * If somebody requests authentication and we haven't 2728 * sent out an auth frame yet there's no need to send 2729 * out a deauth frame either. If the state was PROBE, 2730 * then this is the case. If it's AUTH we have sent a 2731 * frame, and if it's IDLE we have completed the auth 2732 * process already. 2733 */ 2734 if (not_auth_yet) { 2735 __cfg80211_auth_canceled(sdata->dev, bssid); 2736 return 0; 2737 } 2738 } 2739 2740 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n", 2741 sdata->name, bssid, req->reason_code); 2742 2743 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH, 2744 req->reason_code, cookie, 2745 !req->local_state_change); 2746 if (assoc_bss) 2747 sta_info_flush(sdata->local, sdata); 2748 2749 mutex_lock(&sdata->local->mtx); 2750 ieee80211_recalc_idle(sdata->local); 2751 mutex_unlock(&sdata->local->mtx); 2752 2753 return 0; 2754 } 2755 2756 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 2757 struct cfg80211_disassoc_request *req, 2758 void *cookie) 2759 { 2760 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2761 u8 bssid[ETH_ALEN]; 2762 2763 mutex_lock(&ifmgd->mtx); 2764 2765 /* 2766 * cfg80211 should catch this ... but it's racy since 2767 * we can receive a disassoc frame, process it, hand it 2768 * to cfg80211 while that's in a locked section already 2769 * trying to tell us that the user wants to disconnect. 2770 */ 2771 if (ifmgd->associated != req->bss) { 2772 mutex_unlock(&ifmgd->mtx); 2773 return -ENOLINK; 2774 } 2775 2776 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 2777 sdata->name, req->bss->bssid, req->reason_code); 2778 2779 memcpy(bssid, req->bss->bssid, ETH_ALEN); 2780 ieee80211_set_disassoc(sdata, false, true); 2781 2782 mutex_unlock(&ifmgd->mtx); 2783 2784 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid, 2785 IEEE80211_STYPE_DISASSOC, req->reason_code, 2786 cookie, !req->local_state_change); 2787 sta_info_flush(sdata->local, sdata); 2788 2789 mutex_lock(&sdata->local->mtx); 2790 ieee80211_recalc_idle(sdata->local); 2791 mutex_unlock(&sdata->local->mtx); 2792 2793 return 0; 2794 } 2795 2796 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 2797 enum nl80211_cqm_rssi_threshold_event rssi_event, 2798 gfp_t gfp) 2799 { 2800 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2801 2802 trace_api_cqm_rssi_notify(sdata, rssi_event); 2803 2804 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 2805 } 2806 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 2807 2808 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 2809 { 2810 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2811 return sdata->dev->operstate; 2812 } 2813 EXPORT_SYMBOL(ieee80211_get_operstate); 2814