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 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 34 #define IEEE80211_AUTH_MAX_TRIES 3 35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 37 #define IEEE80211_ASSOC_MAX_TRIES 3 38 39 static int max_nullfunc_tries = 2; 40 module_param(max_nullfunc_tries, int, 0644); 41 MODULE_PARM_DESC(max_nullfunc_tries, 42 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 43 44 static int max_probe_tries = 5; 45 module_param(max_probe_tries, int, 0644); 46 MODULE_PARM_DESC(max_probe_tries, 47 "Maximum probe tries before disconnecting (reason 4)."); 48 49 /* 50 * Beacon loss timeout is calculated as N frames times the 51 * advertised beacon interval. This may need to be somewhat 52 * higher than what hardware might detect to account for 53 * delays in the host processing frames. But since we also 54 * probe on beacon miss before declaring the connection lost 55 * default to what we want. 56 */ 57 #define IEEE80211_BEACON_LOSS_COUNT 7 58 59 /* 60 * Time the connection can be idle before we probe 61 * it to see if we can still talk to the AP. 62 */ 63 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 64 /* 65 * Time we wait for a probe response after sending 66 * a probe request because of beacon loss or for 67 * checking the connection still works. 68 */ 69 static int probe_wait_ms = 500; 70 module_param(probe_wait_ms, int, 0644); 71 MODULE_PARM_DESC(probe_wait_ms, 72 "Maximum time(ms) to wait for probe response" 73 " before disconnecting (reason 4)."); 74 75 /* 76 * Weight given to the latest Beacon frame when calculating average signal 77 * strength for Beacon frames received in the current BSS. This must be 78 * between 1 and 15. 79 */ 80 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 81 82 /* 83 * How many Beacon frames need to have been used in average signal strength 84 * before starting to indicate signal change events. 85 */ 86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 87 88 #define TMR_RUNNING_TIMER 0 89 #define TMR_RUNNING_CHANSW 1 90 91 #define DEAUTH_DISASSOC_LEN (24 /* hdr */ + 2 /* reason */) 92 93 /* 94 * All cfg80211 functions have to be called outside a locked 95 * section so that they can acquire a lock themselves... This 96 * is much simpler than queuing up things in cfg80211, but we 97 * do need some indirection for that here. 98 */ 99 enum rx_mgmt_action { 100 /* no action required */ 101 RX_MGMT_NONE, 102 103 /* caller must call cfg80211_send_deauth() */ 104 RX_MGMT_CFG80211_DEAUTH, 105 106 /* caller must call cfg80211_send_disassoc() */ 107 RX_MGMT_CFG80211_DISASSOC, 108 109 /* caller must call cfg80211_send_rx_auth() */ 110 RX_MGMT_CFG80211_RX_AUTH, 111 112 /* caller must call cfg80211_send_rx_assoc() */ 113 RX_MGMT_CFG80211_RX_ASSOC, 114 115 /* caller must call cfg80211_send_assoc_timeout() */ 116 RX_MGMT_CFG80211_ASSOC_TIMEOUT, 117 }; 118 119 /* utils */ 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 121 { 122 lockdep_assert_held(&ifmgd->mtx); 123 } 124 125 /* 126 * We can have multiple work items (and connection probing) 127 * scheduling this timer, but we need to take care to only 128 * reschedule it when it should fire _earlier_ than it was 129 * asked for before, or if it's not pending right now. This 130 * function ensures that. Note that it then is required to 131 * run this function for all timeouts after the first one 132 * has happened -- the work that runs from this timer will 133 * do that. 134 */ 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout) 136 { 137 ASSERT_MGD_MTX(ifmgd); 138 139 if (!timer_pending(&ifmgd->timer) || 140 time_before(timeout, ifmgd->timer.expires)) 141 mod_timer(&ifmgd->timer, timeout); 142 } 143 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 145 { 146 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 147 return; 148 149 mod_timer(&sdata->u.mgd.bcn_mon_timer, 150 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 151 } 152 153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 154 { 155 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 156 157 if (unlikely(!sdata->u.mgd.associated)) 158 return; 159 160 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 161 return; 162 163 mod_timer(&sdata->u.mgd.conn_mon_timer, 164 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 165 166 ifmgd->probe_send_count = 0; 167 } 168 169 static int ecw2cw(int ecw) 170 { 171 return (1 << ecw) - 1; 172 } 173 174 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata, 175 struct ieee80211_ht_operation *ht_oper, 176 const u8 *bssid, bool reconfig) 177 { 178 struct ieee80211_local *local = sdata->local; 179 struct ieee80211_supported_band *sband; 180 struct sta_info *sta; 181 u32 changed = 0; 182 u16 ht_opmode; 183 bool disable_40 = false; 184 185 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 186 187 switch (sdata->vif.bss_conf.channel_type) { 188 case NL80211_CHAN_HT40PLUS: 189 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS) 190 disable_40 = true; 191 break; 192 case NL80211_CHAN_HT40MINUS: 193 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS) 194 disable_40 = true; 195 break; 196 default: 197 break; 198 } 199 200 /* This can change during the lifetime of the BSS */ 201 if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) 202 disable_40 = true; 203 204 mutex_lock(&local->sta_mtx); 205 sta = sta_info_get(sdata, bssid); 206 207 WARN_ON_ONCE(!sta); 208 209 if (sta && !sta->supports_40mhz) 210 disable_40 = true; 211 212 if (sta && (!reconfig || 213 (disable_40 != !(sta->sta.ht_cap.cap & 214 IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) { 215 216 if (disable_40) 217 sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 218 else 219 sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40; 220 221 rate_control_rate_update(local, sband, sta, 222 IEEE80211_RC_BW_CHANGED); 223 } 224 mutex_unlock(&local->sta_mtx); 225 226 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 227 228 /* if bss configuration changed store the new one */ 229 if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) { 230 changed |= BSS_CHANGED_HT; 231 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 232 } 233 234 return changed; 235 } 236 237 /* frame sending functions */ 238 239 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len, 240 struct ieee80211_supported_band *sband, 241 u32 *rates) 242 { 243 int i, j, count; 244 *rates = 0; 245 count = 0; 246 for (i = 0; i < supp_rates_len; i++) { 247 int rate = (supp_rates[i] & 0x7F) * 5; 248 249 for (j = 0; j < sband->n_bitrates; j++) 250 if (sband->bitrates[j].bitrate == rate) { 251 *rates |= BIT(j); 252 count++; 253 break; 254 } 255 } 256 257 return count; 258 } 259 260 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 261 struct sk_buff *skb, const u8 *ht_oper_ie, 262 struct ieee80211_supported_band *sband, 263 struct ieee80211_channel *channel, 264 enum ieee80211_smps_mode smps) 265 { 266 struct ieee80211_ht_operation *ht_oper; 267 u8 *pos; 268 u32 flags = channel->flags; 269 u16 cap; 270 struct ieee80211_sta_ht_cap ht_cap; 271 272 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 273 274 if (!ht_oper_ie) 275 return; 276 277 if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation)) 278 return; 279 280 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 281 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 282 283 ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2); 284 285 /* determine capability flags */ 286 cap = ht_cap.cap; 287 288 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 289 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 290 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 291 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 292 cap &= ~IEEE80211_HT_CAP_SGI_40; 293 } 294 break; 295 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 296 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 297 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 298 cap &= ~IEEE80211_HT_CAP_SGI_40; 299 } 300 break; 301 } 302 303 /* 304 * If 40 MHz was disabled associate as though we weren't 305 * capable of 40 MHz -- some broken APs will never fall 306 * back to trying to transmit in 20 MHz. 307 */ 308 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 309 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 310 cap &= ~IEEE80211_HT_CAP_SGI_40; 311 } 312 313 /* set SM PS mode properly */ 314 cap &= ~IEEE80211_HT_CAP_SM_PS; 315 switch (smps) { 316 case IEEE80211_SMPS_AUTOMATIC: 317 case IEEE80211_SMPS_NUM_MODES: 318 WARN_ON(1); 319 case IEEE80211_SMPS_OFF: 320 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 321 IEEE80211_HT_CAP_SM_PS_SHIFT; 322 break; 323 case IEEE80211_SMPS_STATIC: 324 cap |= WLAN_HT_CAP_SM_PS_STATIC << 325 IEEE80211_HT_CAP_SM_PS_SHIFT; 326 break; 327 case IEEE80211_SMPS_DYNAMIC: 328 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 329 IEEE80211_HT_CAP_SM_PS_SHIFT; 330 break; 331 } 332 333 /* reserve and fill IE */ 334 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 335 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 336 } 337 338 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 339 { 340 struct ieee80211_local *local = sdata->local; 341 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 342 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 343 struct sk_buff *skb; 344 struct ieee80211_mgmt *mgmt; 345 u8 *pos, qos_info; 346 size_t offset = 0, noffset; 347 int i, count, rates_len, supp_rates_len; 348 u16 capab; 349 struct ieee80211_supported_band *sband; 350 u32 rates = 0; 351 352 lockdep_assert_held(&ifmgd->mtx); 353 354 sband = local->hw.wiphy->bands[local->oper_channel->band]; 355 356 if (assoc_data->supp_rates_len) { 357 /* 358 * Get all rates supported by the device and the AP as 359 * some APs don't like getting a superset of their rates 360 * in the association request (e.g. D-Link DAP 1353 in 361 * b-only mode)... 362 */ 363 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates, 364 assoc_data->supp_rates_len, 365 sband, &rates); 366 } else { 367 /* 368 * In case AP not provide any supported rates information 369 * before association, we send information element(s) with 370 * all rates that we support. 371 */ 372 rates = ~0; 373 rates_len = sband->n_bitrates; 374 } 375 376 skb = alloc_skb(local->hw.extra_tx_headroom + 377 sizeof(*mgmt) + /* bit too much but doesn't matter */ 378 2 + assoc_data->ssid_len + /* SSID */ 379 4 + rates_len + /* (extended) rates */ 380 4 + /* power capability */ 381 2 + 2 * sband->n_channels + /* supported channels */ 382 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 383 assoc_data->ie_len + /* extra IEs */ 384 9, /* WMM */ 385 GFP_KERNEL); 386 if (!skb) 387 return; 388 389 skb_reserve(skb, local->hw.extra_tx_headroom); 390 391 capab = WLAN_CAPABILITY_ESS; 392 393 if (sband->band == IEEE80211_BAND_2GHZ) { 394 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 395 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 396 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 397 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 398 } 399 400 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 401 capab |= WLAN_CAPABILITY_PRIVACY; 402 403 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 404 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 405 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 406 407 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 408 memset(mgmt, 0, 24); 409 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 410 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 411 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 412 413 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 414 skb_put(skb, 10); 415 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 416 IEEE80211_STYPE_REASSOC_REQ); 417 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 418 mgmt->u.reassoc_req.listen_interval = 419 cpu_to_le16(local->hw.conf.listen_interval); 420 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 421 ETH_ALEN); 422 } else { 423 skb_put(skb, 4); 424 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 425 IEEE80211_STYPE_ASSOC_REQ); 426 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 427 mgmt->u.assoc_req.listen_interval = 428 cpu_to_le16(local->hw.conf.listen_interval); 429 } 430 431 /* SSID */ 432 pos = skb_put(skb, 2 + assoc_data->ssid_len); 433 *pos++ = WLAN_EID_SSID; 434 *pos++ = assoc_data->ssid_len; 435 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 436 437 /* add all rates which were marked to be used above */ 438 supp_rates_len = rates_len; 439 if (supp_rates_len > 8) 440 supp_rates_len = 8; 441 442 pos = skb_put(skb, supp_rates_len + 2); 443 *pos++ = WLAN_EID_SUPP_RATES; 444 *pos++ = supp_rates_len; 445 446 count = 0; 447 for (i = 0; i < sband->n_bitrates; i++) { 448 if (BIT(i) & rates) { 449 int rate = sband->bitrates[i].bitrate; 450 *pos++ = (u8) (rate / 5); 451 if (++count == 8) 452 break; 453 } 454 } 455 456 if (rates_len > count) { 457 pos = skb_put(skb, rates_len - count + 2); 458 *pos++ = WLAN_EID_EXT_SUPP_RATES; 459 *pos++ = rates_len - count; 460 461 for (i++; i < sband->n_bitrates; i++) { 462 if (BIT(i) & rates) { 463 int rate = sband->bitrates[i].bitrate; 464 *pos++ = (u8) (rate / 5); 465 } 466 } 467 } 468 469 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 470 /* 1. power capabilities */ 471 pos = skb_put(skb, 4); 472 *pos++ = WLAN_EID_PWR_CAPABILITY; 473 *pos++ = 2; 474 *pos++ = 0; /* min tx power */ 475 *pos++ = local->oper_channel->max_power; /* max tx power */ 476 477 /* 2. supported channels */ 478 /* TODO: get this in reg domain format */ 479 pos = skb_put(skb, 2 * sband->n_channels + 2); 480 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 481 *pos++ = 2 * sband->n_channels; 482 for (i = 0; i < sband->n_channels; i++) { 483 *pos++ = ieee80211_frequency_to_channel( 484 sband->channels[i].center_freq); 485 *pos++ = 1; /* one channel in the subband*/ 486 } 487 } 488 489 /* if present, add any custom IEs that go before HT */ 490 if (assoc_data->ie_len && assoc_data->ie) { 491 static const u8 before_ht[] = { 492 WLAN_EID_SSID, 493 WLAN_EID_SUPP_RATES, 494 WLAN_EID_EXT_SUPP_RATES, 495 WLAN_EID_PWR_CAPABILITY, 496 WLAN_EID_SUPPORTED_CHANNELS, 497 WLAN_EID_RSN, 498 WLAN_EID_QOS_CAPA, 499 WLAN_EID_RRM_ENABLED_CAPABILITIES, 500 WLAN_EID_MOBILITY_DOMAIN, 501 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 502 }; 503 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 504 before_ht, ARRAY_SIZE(before_ht), 505 offset); 506 pos = skb_put(skb, noffset - offset); 507 memcpy(pos, assoc_data->ie + offset, noffset - offset); 508 offset = noffset; 509 } 510 511 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 512 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie, 513 sband, local->oper_channel, ifmgd->ap_smps); 514 515 /* if present, add any custom non-vendor IEs that go after HT */ 516 if (assoc_data->ie_len && assoc_data->ie) { 517 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 518 assoc_data->ie_len, 519 offset); 520 pos = skb_put(skb, noffset - offset); 521 memcpy(pos, assoc_data->ie + offset, noffset - offset); 522 offset = noffset; 523 } 524 525 if (assoc_data->wmm) { 526 if (assoc_data->uapsd) { 527 qos_info = ifmgd->uapsd_queues; 528 qos_info |= (ifmgd->uapsd_max_sp_len << 529 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 530 } else { 531 qos_info = 0; 532 } 533 534 pos = skb_put(skb, 9); 535 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 536 *pos++ = 7; /* len */ 537 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 538 *pos++ = 0x50; 539 *pos++ = 0xf2; 540 *pos++ = 2; /* WME */ 541 *pos++ = 0; /* WME info */ 542 *pos++ = 1; /* WME ver */ 543 *pos++ = qos_info; 544 } 545 546 /* add any remaining custom (i.e. vendor specific here) IEs */ 547 if (assoc_data->ie_len && assoc_data->ie) { 548 noffset = assoc_data->ie_len; 549 pos = skb_put(skb, noffset - offset); 550 memcpy(pos, assoc_data->ie + offset, noffset - offset); 551 } 552 553 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 554 ieee80211_tx_skb(sdata, skb); 555 } 556 557 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 558 const u8 *bssid, u16 stype, 559 u16 reason, bool send_frame, 560 u8 *frame_buf) 561 { 562 struct ieee80211_local *local = sdata->local; 563 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 564 struct sk_buff *skb; 565 struct ieee80211_mgmt *mgmt = (void *)frame_buf; 566 567 /* build frame */ 568 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 569 mgmt->duration = 0; /* initialize only */ 570 mgmt->seq_ctrl = 0; /* initialize only */ 571 memcpy(mgmt->da, bssid, ETH_ALEN); 572 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 573 memcpy(mgmt->bssid, bssid, ETH_ALEN); 574 /* u.deauth.reason_code == u.disassoc.reason_code */ 575 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 576 577 if (send_frame) { 578 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 579 DEAUTH_DISASSOC_LEN); 580 if (!skb) 581 return; 582 583 skb_reserve(skb, local->hw.extra_tx_headroom); 584 585 /* copy in frame */ 586 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN), 587 mgmt, DEAUTH_DISASSOC_LEN); 588 589 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) 590 IEEE80211_SKB_CB(skb)->flags |= 591 IEEE80211_TX_INTFL_DONT_ENCRYPT; 592 ieee80211_tx_skb(sdata, skb); 593 } 594 } 595 596 void ieee80211_send_pspoll(struct ieee80211_local *local, 597 struct ieee80211_sub_if_data *sdata) 598 { 599 struct ieee80211_pspoll *pspoll; 600 struct sk_buff *skb; 601 602 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 603 if (!skb) 604 return; 605 606 pspoll = (struct ieee80211_pspoll *) skb->data; 607 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 608 609 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 610 ieee80211_tx_skb(sdata, skb); 611 } 612 613 void ieee80211_send_nullfunc(struct ieee80211_local *local, 614 struct ieee80211_sub_if_data *sdata, 615 int powersave) 616 { 617 struct sk_buff *skb; 618 struct ieee80211_hdr_3addr *nullfunc; 619 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 620 621 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 622 if (!skb) 623 return; 624 625 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 626 if (powersave) 627 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 628 629 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 630 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 631 IEEE80211_STA_CONNECTION_POLL)) 632 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 633 634 ieee80211_tx_skb(sdata, skb); 635 } 636 637 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 638 struct ieee80211_sub_if_data *sdata) 639 { 640 struct sk_buff *skb; 641 struct ieee80211_hdr *nullfunc; 642 __le16 fc; 643 644 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 645 return; 646 647 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 648 if (!skb) 649 return; 650 651 skb_reserve(skb, local->hw.extra_tx_headroom); 652 653 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 654 memset(nullfunc, 0, 30); 655 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 656 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 657 nullfunc->frame_control = fc; 658 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 659 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 660 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 661 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 662 663 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 664 ieee80211_tx_skb(sdata, skb); 665 } 666 667 /* spectrum management related things */ 668 static void ieee80211_chswitch_work(struct work_struct *work) 669 { 670 struct ieee80211_sub_if_data *sdata = 671 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 672 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 673 674 if (!ieee80211_sdata_running(sdata)) 675 return; 676 677 mutex_lock(&ifmgd->mtx); 678 if (!ifmgd->associated) 679 goto out; 680 681 sdata->local->oper_channel = sdata->local->csa_channel; 682 if (!sdata->local->ops->channel_switch) { 683 /* call "hw_config" only if doing sw channel switch */ 684 ieee80211_hw_config(sdata->local, 685 IEEE80211_CONF_CHANGE_CHANNEL); 686 } else { 687 /* update the device channel directly */ 688 sdata->local->hw.conf.channel = sdata->local->oper_channel; 689 } 690 691 /* XXX: shouldn't really modify cfg80211-owned data! */ 692 ifmgd->associated->channel = sdata->local->oper_channel; 693 694 ieee80211_wake_queues_by_reason(&sdata->local->hw, 695 IEEE80211_QUEUE_STOP_REASON_CSA); 696 out: 697 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 698 mutex_unlock(&ifmgd->mtx); 699 } 700 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 702 { 703 struct ieee80211_sub_if_data *sdata; 704 struct ieee80211_if_managed *ifmgd; 705 706 sdata = vif_to_sdata(vif); 707 ifmgd = &sdata->u.mgd; 708 709 trace_api_chswitch_done(sdata, success); 710 if (!success) { 711 /* 712 * If the channel switch was not successful, stay 713 * around on the old channel. We currently lack 714 * good handling of this situation, possibly we 715 * should just drop the association. 716 */ 717 sdata->local->csa_channel = sdata->local->oper_channel; 718 } 719 720 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 721 } 722 EXPORT_SYMBOL(ieee80211_chswitch_done); 723 724 static void ieee80211_chswitch_timer(unsigned long data) 725 { 726 struct ieee80211_sub_if_data *sdata = 727 (struct ieee80211_sub_if_data *) data; 728 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 729 730 if (sdata->local->quiescing) { 731 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 732 return; 733 } 734 735 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 736 } 737 738 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 739 struct ieee80211_channel_sw_ie *sw_elem, 740 struct ieee80211_bss *bss, 741 u64 timestamp) 742 { 743 struct cfg80211_bss *cbss = 744 container_of((void *)bss, struct cfg80211_bss, priv); 745 struct ieee80211_channel *new_ch; 746 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 747 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 748 cbss->channel->band); 749 750 ASSERT_MGD_MTX(ifmgd); 751 752 if (!ifmgd->associated) 753 return; 754 755 if (sdata->local->scanning) 756 return; 757 758 /* Disregard subsequent beacons if we are already running a timer 759 processing a CSA */ 760 761 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 762 return; 763 764 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 765 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) 766 return; 767 768 sdata->local->csa_channel = new_ch; 769 770 if (sdata->local->ops->channel_switch) { 771 /* use driver's channel switch callback */ 772 struct ieee80211_channel_switch ch_switch; 773 memset(&ch_switch, 0, sizeof(ch_switch)); 774 ch_switch.timestamp = timestamp; 775 if (sw_elem->mode) { 776 ch_switch.block_tx = true; 777 ieee80211_stop_queues_by_reason(&sdata->local->hw, 778 IEEE80211_QUEUE_STOP_REASON_CSA); 779 } 780 ch_switch.channel = new_ch; 781 ch_switch.count = sw_elem->count; 782 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 783 drv_channel_switch(sdata->local, &ch_switch); 784 return; 785 } 786 787 /* channel switch handled in software */ 788 if (sw_elem->count <= 1) { 789 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 790 } else { 791 if (sw_elem->mode) 792 ieee80211_stop_queues_by_reason(&sdata->local->hw, 793 IEEE80211_QUEUE_STOP_REASON_CSA); 794 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 795 mod_timer(&ifmgd->chswitch_timer, 796 jiffies + 797 msecs_to_jiffies(sw_elem->count * 798 cbss->beacon_interval)); 799 } 800 } 801 802 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 803 u16 capab_info, u8 *pwr_constr_elem, 804 u8 pwr_constr_elem_len) 805 { 806 struct ieee80211_conf *conf = &sdata->local->hw.conf; 807 808 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) 809 return; 810 811 /* Power constraint IE length should be 1 octet */ 812 if (pwr_constr_elem_len != 1) 813 return; 814 815 if ((*pwr_constr_elem <= conf->channel->max_reg_power) && 816 (*pwr_constr_elem != sdata->local->power_constr_level)) { 817 sdata->local->power_constr_level = *pwr_constr_elem; 818 ieee80211_hw_config(sdata->local, 0); 819 } 820 } 821 822 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) 823 { 824 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 825 struct ieee80211_local *local = sdata->local; 826 struct ieee80211_conf *conf = &local->hw.conf; 827 828 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 829 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 830 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 831 832 local->disable_dynamic_ps = false; 833 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; 834 } 835 EXPORT_SYMBOL(ieee80211_enable_dyn_ps); 836 837 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) 838 { 839 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 840 struct ieee80211_local *local = sdata->local; 841 struct ieee80211_conf *conf = &local->hw.conf; 842 843 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || 844 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || 845 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); 846 847 local->disable_dynamic_ps = true; 848 conf->dynamic_ps_timeout = 0; 849 del_timer_sync(&local->dynamic_ps_timer); 850 ieee80211_queue_work(&local->hw, 851 &local->dynamic_ps_enable_work); 852 } 853 EXPORT_SYMBOL(ieee80211_disable_dyn_ps); 854 855 /* powersave */ 856 static void ieee80211_enable_ps(struct ieee80211_local *local, 857 struct ieee80211_sub_if_data *sdata) 858 { 859 struct ieee80211_conf *conf = &local->hw.conf; 860 861 /* 862 * If we are scanning right now then the parameters will 863 * take effect when scan finishes. 864 */ 865 if (local->scanning) 866 return; 867 868 if (conf->dynamic_ps_timeout > 0 && 869 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 870 mod_timer(&local->dynamic_ps_timer, jiffies + 871 msecs_to_jiffies(conf->dynamic_ps_timeout)); 872 } else { 873 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 874 ieee80211_send_nullfunc(local, sdata, 1); 875 876 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 877 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 878 return; 879 880 conf->flags |= IEEE80211_CONF_PS; 881 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 882 } 883 } 884 885 static void ieee80211_change_ps(struct ieee80211_local *local) 886 { 887 struct ieee80211_conf *conf = &local->hw.conf; 888 889 if (local->ps_sdata) { 890 ieee80211_enable_ps(local, local->ps_sdata); 891 } else if (conf->flags & IEEE80211_CONF_PS) { 892 conf->flags &= ~IEEE80211_CONF_PS; 893 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 894 del_timer_sync(&local->dynamic_ps_timer); 895 cancel_work_sync(&local->dynamic_ps_enable_work); 896 } 897 } 898 899 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 900 { 901 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 902 struct sta_info *sta = NULL; 903 bool authorized = false; 904 905 if (!mgd->powersave) 906 return false; 907 908 if (mgd->broken_ap) 909 return false; 910 911 if (!mgd->associated) 912 return false; 913 914 if (!mgd->associated->beacon_ies) 915 return false; 916 917 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 918 IEEE80211_STA_CONNECTION_POLL)) 919 return false; 920 921 rcu_read_lock(); 922 sta = sta_info_get(sdata, mgd->bssid); 923 if (sta) 924 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 925 rcu_read_unlock(); 926 927 return authorized; 928 } 929 930 /* need to hold RTNL or interface lock */ 931 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 932 { 933 struct ieee80211_sub_if_data *sdata, *found = NULL; 934 int count = 0; 935 int timeout; 936 937 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 938 local->ps_sdata = NULL; 939 return; 940 } 941 942 if (!list_empty(&local->work_list)) { 943 local->ps_sdata = NULL; 944 goto change; 945 } 946 947 list_for_each_entry(sdata, &local->interfaces, list) { 948 if (!ieee80211_sdata_running(sdata)) 949 continue; 950 if (sdata->vif.type == NL80211_IFTYPE_AP) { 951 /* If an AP vif is found, then disable PS 952 * by setting the count to zero thereby setting 953 * ps_sdata to NULL. 954 */ 955 count = 0; 956 break; 957 } 958 if (sdata->vif.type != NL80211_IFTYPE_STATION) 959 continue; 960 found = sdata; 961 count++; 962 } 963 964 if (count == 1 && ieee80211_powersave_allowed(found)) { 965 struct ieee80211_conf *conf = &local->hw.conf; 966 s32 beaconint_us; 967 968 if (latency < 0) 969 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 970 971 beaconint_us = ieee80211_tu_to_usec( 972 found->vif.bss_conf.beacon_int); 973 974 timeout = local->dynamic_ps_forced_timeout; 975 if (timeout < 0) { 976 /* 977 * Go to full PSM if the user configures a very low 978 * latency requirement. 979 * The 2000 second value is there for compatibility 980 * until the PM_QOS_NETWORK_LATENCY is configured 981 * with real values. 982 */ 983 if (latency > (1900 * USEC_PER_MSEC) && 984 latency != (2000 * USEC_PER_SEC)) 985 timeout = 0; 986 else 987 timeout = 100; 988 } 989 local->dynamic_ps_user_timeout = timeout; 990 if (!local->disable_dynamic_ps) 991 conf->dynamic_ps_timeout = 992 local->dynamic_ps_user_timeout; 993 994 if (beaconint_us > latency) { 995 local->ps_sdata = NULL; 996 } else { 997 struct ieee80211_bss *bss; 998 int maxslp = 1; 999 u8 dtimper; 1000 1001 bss = (void *)found->u.mgd.associated->priv; 1002 dtimper = bss->dtim_period; 1003 1004 /* If the TIM IE is invalid, pretend the value is 1 */ 1005 if (!dtimper) 1006 dtimper = 1; 1007 else if (dtimper > 1) 1008 maxslp = min_t(int, dtimper, 1009 latency / beaconint_us); 1010 1011 local->hw.conf.max_sleep_period = maxslp; 1012 local->hw.conf.ps_dtim_period = dtimper; 1013 local->ps_sdata = found; 1014 } 1015 } else { 1016 local->ps_sdata = NULL; 1017 } 1018 1019 change: 1020 ieee80211_change_ps(local); 1021 } 1022 1023 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1024 { 1025 struct ieee80211_local *local = 1026 container_of(work, struct ieee80211_local, 1027 dynamic_ps_disable_work); 1028 1029 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1030 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1031 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1032 } 1033 1034 ieee80211_wake_queues_by_reason(&local->hw, 1035 IEEE80211_QUEUE_STOP_REASON_PS); 1036 } 1037 1038 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1039 { 1040 struct ieee80211_local *local = 1041 container_of(work, struct ieee80211_local, 1042 dynamic_ps_enable_work); 1043 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1044 struct ieee80211_if_managed *ifmgd; 1045 unsigned long flags; 1046 int q; 1047 1048 /* can only happen when PS was just disabled anyway */ 1049 if (!sdata) 1050 return; 1051 1052 ifmgd = &sdata->u.mgd; 1053 1054 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1055 return; 1056 1057 if (!local->disable_dynamic_ps && 1058 local->hw.conf.dynamic_ps_timeout > 0) { 1059 /* don't enter PS if TX frames are pending */ 1060 if (drv_tx_frames_pending(local)) { 1061 mod_timer(&local->dynamic_ps_timer, jiffies + 1062 msecs_to_jiffies( 1063 local->hw.conf.dynamic_ps_timeout)); 1064 return; 1065 } 1066 1067 /* 1068 * transmission can be stopped by others which leads to 1069 * dynamic_ps_timer expiry. Postpone the ps timer if it 1070 * is not the actual idle state. 1071 */ 1072 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1073 for (q = 0; q < local->hw.queues; q++) { 1074 if (local->queue_stop_reasons[q]) { 1075 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1076 flags); 1077 mod_timer(&local->dynamic_ps_timer, jiffies + 1078 msecs_to_jiffies( 1079 local->hw.conf.dynamic_ps_timeout)); 1080 return; 1081 } 1082 } 1083 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1084 } 1085 1086 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1087 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1088 netif_tx_stop_all_queues(sdata->dev); 1089 1090 if (drv_tx_frames_pending(local)) 1091 mod_timer(&local->dynamic_ps_timer, jiffies + 1092 msecs_to_jiffies( 1093 local->hw.conf.dynamic_ps_timeout)); 1094 else { 1095 ieee80211_send_nullfunc(local, sdata, 1); 1096 /* Flush to get the tx status of nullfunc frame */ 1097 drv_flush(local, false); 1098 } 1099 } 1100 1101 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 1102 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 1103 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1104 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1105 local->hw.conf.flags |= IEEE80211_CONF_PS; 1106 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1107 } 1108 1109 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1110 netif_tx_wake_all_queues(sdata->dev); 1111 } 1112 1113 void ieee80211_dynamic_ps_timer(unsigned long data) 1114 { 1115 struct ieee80211_local *local = (void *) data; 1116 1117 if (local->quiescing || local->suspended) 1118 return; 1119 1120 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1121 } 1122 1123 /* MLME */ 1124 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 1125 struct ieee80211_sub_if_data *sdata, 1126 u8 *wmm_param, size_t wmm_param_len) 1127 { 1128 struct ieee80211_tx_queue_params params; 1129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1130 size_t left; 1131 int count; 1132 u8 *pos, uapsd_queues = 0; 1133 1134 if (!local->ops->conf_tx) 1135 return; 1136 1137 if (local->hw.queues < IEEE80211_NUM_ACS) 1138 return; 1139 1140 if (!wmm_param) 1141 return; 1142 1143 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1144 return; 1145 1146 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1147 uapsd_queues = ifmgd->uapsd_queues; 1148 1149 count = wmm_param[6] & 0x0f; 1150 if (count == ifmgd->wmm_last_param_set) 1151 return; 1152 ifmgd->wmm_last_param_set = count; 1153 1154 pos = wmm_param + 8; 1155 left = wmm_param_len - 8; 1156 1157 memset(¶ms, 0, sizeof(params)); 1158 1159 local->wmm_acm = 0; 1160 for (; left >= 4; left -= 4, pos += 4) { 1161 int aci = (pos[0] >> 5) & 0x03; 1162 int acm = (pos[0] >> 4) & 0x01; 1163 bool uapsd = false; 1164 int queue; 1165 1166 switch (aci) { 1167 case 1: /* AC_BK */ 1168 queue = 3; 1169 if (acm) 1170 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1171 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1172 uapsd = true; 1173 break; 1174 case 2: /* AC_VI */ 1175 queue = 1; 1176 if (acm) 1177 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1178 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1179 uapsd = true; 1180 break; 1181 case 3: /* AC_VO */ 1182 queue = 0; 1183 if (acm) 1184 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1185 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1186 uapsd = true; 1187 break; 1188 case 0: /* AC_BE */ 1189 default: 1190 queue = 2; 1191 if (acm) 1192 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1193 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1194 uapsd = true; 1195 break; 1196 } 1197 1198 params.aifs = pos[0] & 0x0f; 1199 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1200 params.cw_min = ecw2cw(pos[1] & 0x0f); 1201 params.txop = get_unaligned_le16(pos + 2); 1202 params.uapsd = uapsd; 1203 1204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1205 wiphy_debug(local->hw.wiphy, 1206 "WMM queue=%d aci=%d acm=%d aifs=%d " 1207 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 1208 queue, aci, acm, 1209 params.aifs, params.cw_min, params.cw_max, 1210 params.txop, params.uapsd); 1211 #endif 1212 sdata->tx_conf[queue] = params; 1213 if (drv_conf_tx(local, sdata, queue, ¶ms)) 1214 wiphy_debug(local->hw.wiphy, 1215 "failed to set TX queue parameters for queue %d\n", 1216 queue); 1217 } 1218 1219 /* enable WMM or activate new settings */ 1220 sdata->vif.bss_conf.qos = true; 1221 } 1222 1223 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1224 u16 capab, bool erp_valid, u8 erp) 1225 { 1226 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1227 u32 changed = 0; 1228 bool use_protection; 1229 bool use_short_preamble; 1230 bool use_short_slot; 1231 1232 if (erp_valid) { 1233 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1234 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1235 } else { 1236 use_protection = false; 1237 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1238 } 1239 1240 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1241 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 1242 use_short_slot = true; 1243 1244 if (use_protection != bss_conf->use_cts_prot) { 1245 bss_conf->use_cts_prot = use_protection; 1246 changed |= BSS_CHANGED_ERP_CTS_PROT; 1247 } 1248 1249 if (use_short_preamble != bss_conf->use_short_preamble) { 1250 bss_conf->use_short_preamble = use_short_preamble; 1251 changed |= BSS_CHANGED_ERP_PREAMBLE; 1252 } 1253 1254 if (use_short_slot != bss_conf->use_short_slot) { 1255 bss_conf->use_short_slot = use_short_slot; 1256 changed |= BSS_CHANGED_ERP_SLOT; 1257 } 1258 1259 return changed; 1260 } 1261 1262 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1263 struct cfg80211_bss *cbss, 1264 u32 bss_info_changed) 1265 { 1266 struct ieee80211_bss *bss = (void *)cbss->priv; 1267 struct ieee80211_local *local = sdata->local; 1268 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1269 1270 bss_info_changed |= BSS_CHANGED_ASSOC; 1271 /* set timing information */ 1272 bss_conf->beacon_int = cbss->beacon_interval; 1273 bss_conf->last_tsf = cbss->tsf; 1274 1275 bss_info_changed |= BSS_CHANGED_BEACON_INT; 1276 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1277 cbss->capability, bss->has_erp_value, bss->erp_value); 1278 1279 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1280 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1281 1282 sdata->u.mgd.associated = cbss; 1283 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1284 1285 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1286 1287 /* just to be sure */ 1288 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1289 IEEE80211_STA_BEACON_POLL); 1290 1291 ieee80211_led_assoc(local, 1); 1292 1293 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1294 bss_conf->dtim_period = bss->dtim_period; 1295 else 1296 bss_conf->dtim_period = 0; 1297 1298 bss_conf->assoc = 1; 1299 1300 /* Tell the driver to monitor connection quality (if supported) */ 1301 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1302 bss_conf->cqm_rssi_thold) 1303 bss_info_changed |= BSS_CHANGED_CQM; 1304 1305 /* Enable ARP filtering */ 1306 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1307 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1308 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1309 } 1310 1311 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1312 1313 mutex_lock(&local->iflist_mtx); 1314 ieee80211_recalc_ps(local, -1); 1315 ieee80211_recalc_smps(local); 1316 mutex_unlock(&local->iflist_mtx); 1317 1318 netif_tx_start_all_queues(sdata->dev); 1319 netif_carrier_on(sdata->dev); 1320 } 1321 1322 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1323 u16 stype, u16 reason, bool tx, 1324 u8 *frame_buf) 1325 { 1326 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1327 struct ieee80211_local *local = sdata->local; 1328 struct sta_info *sta; 1329 u32 changed = 0; 1330 u8 bssid[ETH_ALEN]; 1331 1332 ASSERT_MGD_MTX(ifmgd); 1333 1334 if (WARN_ON_ONCE(tx && !frame_buf)) 1335 return; 1336 1337 if (WARN_ON(!ifmgd->associated)) 1338 return; 1339 1340 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1341 1342 ifmgd->associated = NULL; 1343 memset(ifmgd->bssid, 0, ETH_ALEN); 1344 1345 /* 1346 * we need to commit the associated = NULL change because the 1347 * scan code uses that to determine whether this iface should 1348 * go to/wake up from powersave or not -- and could otherwise 1349 * wake the queues erroneously. 1350 */ 1351 smp_mb(); 1352 1353 /* 1354 * Thus, we can only afterwards stop the queues -- to account 1355 * for the case where another CPU is finishing a scan at this 1356 * time -- we don't want the scan code to enable queues. 1357 */ 1358 1359 netif_tx_stop_all_queues(sdata->dev); 1360 netif_carrier_off(sdata->dev); 1361 1362 mutex_lock(&local->sta_mtx); 1363 sta = sta_info_get(sdata, bssid); 1364 if (sta) { 1365 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 1366 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1367 } 1368 mutex_unlock(&local->sta_mtx); 1369 1370 /* deauthenticate/disassociate now */ 1371 if (tx || frame_buf) 1372 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason, 1373 tx, frame_buf); 1374 1375 /* flush out frame */ 1376 if (tx) 1377 drv_flush(local, false); 1378 1379 /* remove AP and TDLS peers */ 1380 sta_info_flush(local, sdata); 1381 1382 /* finally reset all BSS / config parameters */ 1383 changed |= ieee80211_reset_erp_info(sdata); 1384 1385 ieee80211_led_assoc(local, 0); 1386 changed |= BSS_CHANGED_ASSOC; 1387 sdata->vif.bss_conf.assoc = false; 1388 1389 /* on the next assoc, re-program HT parameters */ 1390 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 1391 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 1392 1393 local->power_constr_level = 0; 1394 1395 del_timer_sync(&local->dynamic_ps_timer); 1396 cancel_work_sync(&local->dynamic_ps_enable_work); 1397 1398 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1399 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1400 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1401 } 1402 local->ps_sdata = NULL; 1403 1404 /* Disable ARP filtering */ 1405 if (sdata->vif.bss_conf.arp_filter_enabled) { 1406 sdata->vif.bss_conf.arp_filter_enabled = false; 1407 changed |= BSS_CHANGED_ARP_FILTER; 1408 } 1409 1410 sdata->vif.bss_conf.qos = false; 1411 changed |= BSS_CHANGED_QOS; 1412 1413 /* The BSSID (not really interesting) and HT changed */ 1414 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1415 ieee80211_bss_info_change_notify(sdata, changed); 1416 1417 /* channel(_type) changes are handled by ieee80211_hw_config */ 1418 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1419 ieee80211_hw_config(local, 0); 1420 1421 /* disassociated - set to defaults now */ 1422 ieee80211_set_wmm_default(sdata, false); 1423 1424 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1425 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1426 del_timer_sync(&sdata->u.mgd.timer); 1427 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1428 } 1429 1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1431 struct ieee80211_hdr *hdr) 1432 { 1433 /* 1434 * We can postpone the mgd.timer whenever receiving unicast frames 1435 * from AP because we know that the connection is working both ways 1436 * at that time. But multicast frames (and hence also beacons) must 1437 * be ignored here, because we need to trigger the timer during 1438 * data idle periods for sending the periodic probe request to the 1439 * AP we're connected to. 1440 */ 1441 if (is_multicast_ether_addr(hdr->addr1)) 1442 return; 1443 1444 ieee80211_sta_reset_conn_monitor(sdata); 1445 } 1446 1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1448 { 1449 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1450 struct ieee80211_local *local = sdata->local; 1451 1452 mutex_lock(&local->mtx); 1453 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1454 IEEE80211_STA_CONNECTION_POLL))) { 1455 mutex_unlock(&local->mtx); 1456 return; 1457 } 1458 1459 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1460 IEEE80211_STA_BEACON_POLL); 1461 1462 mutex_lock(&local->iflist_mtx); 1463 ieee80211_recalc_ps(local, -1); 1464 mutex_unlock(&local->iflist_mtx); 1465 1466 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1467 goto out; 1468 1469 /* 1470 * We've received a probe response, but are not sure whether 1471 * we have or will be receiving any beacons or data, so let's 1472 * schedule the timers again, just in case. 1473 */ 1474 ieee80211_sta_reset_beacon_monitor(sdata); 1475 1476 mod_timer(&ifmgd->conn_mon_timer, 1477 round_jiffies_up(jiffies + 1478 IEEE80211_CONNECTION_IDLE_TIME)); 1479 out: 1480 ieee80211_run_deferred_scan(local); 1481 mutex_unlock(&local->mtx); 1482 } 1483 1484 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1485 struct ieee80211_hdr *hdr, bool ack) 1486 { 1487 if (!ieee80211_is_data(hdr->frame_control)) 1488 return; 1489 1490 if (ack) 1491 ieee80211_sta_reset_conn_monitor(sdata); 1492 1493 if (ieee80211_is_nullfunc(hdr->frame_control) && 1494 sdata->u.mgd.probe_send_count > 0) { 1495 if (ack) 1496 sdata->u.mgd.probe_send_count = 0; 1497 else 1498 sdata->u.mgd.nullfunc_failed = true; 1499 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1500 } 1501 } 1502 1503 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1504 { 1505 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1506 const u8 *ssid; 1507 u8 *dst = ifmgd->associated->bssid; 1508 u8 unicast_limit = max(1, max_probe_tries - 3); 1509 1510 /* 1511 * Try sending broadcast probe requests for the last three 1512 * probe requests after the first ones failed since some 1513 * buggy APs only support broadcast probe requests. 1514 */ 1515 if (ifmgd->probe_send_count >= unicast_limit) 1516 dst = NULL; 1517 1518 /* 1519 * When the hardware reports an accurate Tx ACK status, it's 1520 * better to send a nullfunc frame instead of a probe request, 1521 * as it will kick us off the AP quickly if we aren't associated 1522 * anymore. The timeout will be reset if the frame is ACKed by 1523 * the AP. 1524 */ 1525 ifmgd->probe_send_count++; 1526 1527 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1528 ifmgd->nullfunc_failed = false; 1529 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1530 } else { 1531 int ssid_len; 1532 1533 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1534 if (WARN_ON_ONCE(ssid == NULL)) 1535 ssid_len = 0; 1536 else 1537 ssid_len = ssid[1]; 1538 1539 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL, 1540 0, (u32) -1, true, false); 1541 } 1542 1543 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1544 run_again(ifmgd, ifmgd->probe_timeout); 1545 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1546 drv_flush(sdata->local, false); 1547 } 1548 1549 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1550 bool beacon) 1551 { 1552 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1553 bool already = false; 1554 1555 if (!ieee80211_sdata_running(sdata)) 1556 return; 1557 1558 mutex_lock(&ifmgd->mtx); 1559 1560 if (!ifmgd->associated) 1561 goto out; 1562 1563 mutex_lock(&sdata->local->mtx); 1564 1565 if (sdata->local->tmp_channel || sdata->local->scanning) { 1566 mutex_unlock(&sdata->local->mtx); 1567 goto out; 1568 } 1569 1570 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1571 if (beacon) 1572 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n", 1573 sdata->name); 1574 #endif 1575 1576 /* 1577 * The driver/our work has already reported this event or the 1578 * connection monitoring has kicked in and we have already sent 1579 * a probe request. Or maybe the AP died and the driver keeps 1580 * reporting until we disassociate... 1581 * 1582 * In either case we have to ignore the current call to this 1583 * function (except for setting the correct probe reason bit) 1584 * because otherwise we would reset the timer every time and 1585 * never check whether we received a probe response! 1586 */ 1587 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1588 IEEE80211_STA_CONNECTION_POLL)) 1589 already = true; 1590 1591 if (beacon) 1592 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1593 else 1594 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1595 1596 mutex_unlock(&sdata->local->mtx); 1597 1598 if (already) 1599 goto out; 1600 1601 mutex_lock(&sdata->local->iflist_mtx); 1602 ieee80211_recalc_ps(sdata->local, -1); 1603 mutex_unlock(&sdata->local->iflist_mtx); 1604 1605 ifmgd->probe_send_count = 0; 1606 ieee80211_mgd_probe_ap_send(sdata); 1607 out: 1608 mutex_unlock(&ifmgd->mtx); 1609 } 1610 1611 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1612 struct ieee80211_vif *vif) 1613 { 1614 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1615 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1616 struct sk_buff *skb; 1617 const u8 *ssid; 1618 int ssid_len; 1619 1620 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1621 return NULL; 1622 1623 ASSERT_MGD_MTX(ifmgd); 1624 1625 if (!ifmgd->associated) 1626 return NULL; 1627 1628 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1629 if (WARN_ON_ONCE(ssid == NULL)) 1630 ssid_len = 0; 1631 else 1632 ssid_len = ssid[1]; 1633 1634 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1635 (u32) -1, ssid + 2, ssid_len, 1636 NULL, 0, true); 1637 1638 return skb; 1639 } 1640 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1641 1642 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1643 { 1644 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1645 struct ieee80211_local *local = sdata->local; 1646 u8 bssid[ETH_ALEN]; 1647 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 1648 1649 mutex_lock(&ifmgd->mtx); 1650 if (!ifmgd->associated) { 1651 mutex_unlock(&ifmgd->mtx); 1652 return; 1653 } 1654 1655 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1656 1657 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1658 sdata->name, bssid); 1659 1660 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 1661 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1662 false, frame_buf); 1663 mutex_unlock(&ifmgd->mtx); 1664 1665 /* 1666 * must be outside lock due to cfg80211, 1667 * but that's not a problem. 1668 */ 1669 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 1670 1671 mutex_lock(&local->mtx); 1672 ieee80211_recalc_idle(local); 1673 mutex_unlock(&local->mtx); 1674 } 1675 1676 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1677 { 1678 struct ieee80211_sub_if_data *sdata = 1679 container_of(work, struct ieee80211_sub_if_data, 1680 u.mgd.beacon_connection_loss_work); 1681 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1682 struct sta_info *sta; 1683 1684 if (ifmgd->associated) { 1685 rcu_read_lock(); 1686 sta = sta_info_get(sdata, ifmgd->bssid); 1687 if (sta) 1688 sta->beacon_loss_count++; 1689 rcu_read_unlock(); 1690 } 1691 1692 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1693 __ieee80211_connection_loss(sdata); 1694 else 1695 ieee80211_mgd_probe_ap(sdata, true); 1696 } 1697 1698 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1699 { 1700 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1701 struct ieee80211_hw *hw = &sdata->local->hw; 1702 1703 trace_api_beacon_loss(sdata); 1704 1705 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1706 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1707 } 1708 EXPORT_SYMBOL(ieee80211_beacon_loss); 1709 1710 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1711 { 1712 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1713 struct ieee80211_hw *hw = &sdata->local->hw; 1714 1715 trace_api_connection_loss(sdata); 1716 1717 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1718 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1719 } 1720 EXPORT_SYMBOL(ieee80211_connection_loss); 1721 1722 1723 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 1724 bool assoc) 1725 { 1726 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 1727 1728 lockdep_assert_held(&sdata->u.mgd.mtx); 1729 1730 if (!assoc) { 1731 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 1732 1733 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 1734 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 1735 } 1736 1737 cfg80211_put_bss(auth_data->bss); 1738 kfree(auth_data); 1739 sdata->u.mgd.auth_data = NULL; 1740 } 1741 1742 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 1743 struct ieee80211_mgmt *mgmt, size_t len) 1744 { 1745 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 1746 u8 *pos; 1747 struct ieee802_11_elems elems; 1748 1749 pos = mgmt->u.auth.variable; 1750 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1751 if (!elems.challenge) 1752 return; 1753 auth_data->expected_transaction = 4; 1754 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 1755 elems.challenge - 2, elems.challenge_len + 2, 1756 auth_data->bss->bssid, auth_data->bss->bssid, 1757 auth_data->key, auth_data->key_len, 1758 auth_data->key_idx); 1759 } 1760 1761 static enum rx_mgmt_action __must_check 1762 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 1763 struct ieee80211_mgmt *mgmt, size_t len) 1764 { 1765 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1766 u8 bssid[ETH_ALEN]; 1767 u16 auth_alg, auth_transaction, status_code; 1768 struct sta_info *sta; 1769 1770 lockdep_assert_held(&ifmgd->mtx); 1771 1772 if (len < 24 + 6) 1773 return RX_MGMT_NONE; 1774 1775 if (!ifmgd->auth_data || ifmgd->auth_data->done) 1776 return RX_MGMT_NONE; 1777 1778 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 1779 1780 if (!ether_addr_equal(bssid, mgmt->bssid)) 1781 return RX_MGMT_NONE; 1782 1783 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 1784 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 1785 status_code = le16_to_cpu(mgmt->u.auth.status_code); 1786 1787 if (auth_alg != ifmgd->auth_data->algorithm || 1788 auth_transaction != ifmgd->auth_data->expected_transaction) 1789 return RX_MGMT_NONE; 1790 1791 if (status_code != WLAN_STATUS_SUCCESS) { 1792 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n", 1793 sdata->name, mgmt->sa, status_code); 1794 goto out; 1795 } 1796 1797 switch (ifmgd->auth_data->algorithm) { 1798 case WLAN_AUTH_OPEN: 1799 case WLAN_AUTH_LEAP: 1800 case WLAN_AUTH_FT: 1801 break; 1802 case WLAN_AUTH_SHARED_KEY: 1803 if (ifmgd->auth_data->expected_transaction != 4) { 1804 ieee80211_auth_challenge(sdata, mgmt, len); 1805 /* need another frame */ 1806 return RX_MGMT_NONE; 1807 } 1808 break; 1809 default: 1810 WARN_ONCE(1, "invalid auth alg %d", 1811 ifmgd->auth_data->algorithm); 1812 return RX_MGMT_NONE; 1813 } 1814 1815 printk(KERN_DEBUG "%s: authenticated\n", sdata->name); 1816 out: 1817 ifmgd->auth_data->done = true; 1818 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 1819 run_again(ifmgd, ifmgd->auth_data->timeout); 1820 1821 /* move station state to auth */ 1822 mutex_lock(&sdata->local->sta_mtx); 1823 sta = sta_info_get(sdata, bssid); 1824 if (!sta) { 1825 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 1826 goto out_err; 1827 } 1828 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 1829 printk(KERN_DEBUG "%s: failed moving %pM to auth\n", 1830 sdata->name, bssid); 1831 goto out_err; 1832 } 1833 mutex_unlock(&sdata->local->sta_mtx); 1834 1835 return RX_MGMT_CFG80211_RX_AUTH; 1836 out_err: 1837 mutex_unlock(&sdata->local->sta_mtx); 1838 /* ignore frame -- wait for timeout */ 1839 return RX_MGMT_NONE; 1840 } 1841 1842 1843 static enum rx_mgmt_action __must_check 1844 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1845 struct ieee80211_mgmt *mgmt, size_t len) 1846 { 1847 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1848 const u8 *bssid = NULL; 1849 u16 reason_code; 1850 1851 lockdep_assert_held(&ifmgd->mtx); 1852 1853 if (len < 24 + 2) 1854 return RX_MGMT_NONE; 1855 1856 if (!ifmgd->associated || 1857 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 1858 return RX_MGMT_NONE; 1859 1860 bssid = ifmgd->associated->bssid; 1861 1862 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1863 1864 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1865 sdata->name, bssid, reason_code); 1866 1867 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 1868 1869 mutex_lock(&sdata->local->mtx); 1870 ieee80211_recalc_idle(sdata->local); 1871 mutex_unlock(&sdata->local->mtx); 1872 1873 return RX_MGMT_CFG80211_DEAUTH; 1874 } 1875 1876 1877 static enum rx_mgmt_action __must_check 1878 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1879 struct ieee80211_mgmt *mgmt, size_t len) 1880 { 1881 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1882 u16 reason_code; 1883 1884 lockdep_assert_held(&ifmgd->mtx); 1885 1886 if (len < 24 + 2) 1887 return RX_MGMT_NONE; 1888 1889 if (!ifmgd->associated || 1890 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 1891 return RX_MGMT_NONE; 1892 1893 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1894 1895 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1896 sdata->name, mgmt->sa, reason_code); 1897 1898 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 1899 1900 mutex_lock(&sdata->local->mtx); 1901 ieee80211_recalc_idle(sdata->local); 1902 mutex_unlock(&sdata->local->mtx); 1903 1904 return RX_MGMT_CFG80211_DISASSOC; 1905 } 1906 1907 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 1908 u8 *supp_rates, unsigned int supp_rates_len, 1909 u32 *rates, u32 *basic_rates, 1910 bool *have_higher_than_11mbit, 1911 int *min_rate, int *min_rate_index) 1912 { 1913 int i, j; 1914 1915 for (i = 0; i < supp_rates_len; i++) { 1916 int rate = (supp_rates[i] & 0x7f) * 5; 1917 bool is_basic = !!(supp_rates[i] & 0x80); 1918 1919 if (rate > 110) 1920 *have_higher_than_11mbit = true; 1921 1922 /* 1923 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 1924 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 1925 * 1926 * Note: Even through the membership selector and the basic 1927 * rate flag share the same bit, they are not exactly 1928 * the same. 1929 */ 1930 if (!!(supp_rates[i] & 0x80) && 1931 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 1932 continue; 1933 1934 for (j = 0; j < sband->n_bitrates; j++) { 1935 if (sband->bitrates[j].bitrate == rate) { 1936 *rates |= BIT(j); 1937 if (is_basic) 1938 *basic_rates |= BIT(j); 1939 if (rate < *min_rate) { 1940 *min_rate = rate; 1941 *min_rate_index = j; 1942 } 1943 break; 1944 } 1945 } 1946 } 1947 } 1948 1949 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 1950 bool assoc) 1951 { 1952 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 1953 1954 lockdep_assert_held(&sdata->u.mgd.mtx); 1955 1956 if (!assoc) { 1957 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 1958 1959 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 1960 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 1961 } 1962 1963 kfree(assoc_data); 1964 sdata->u.mgd.assoc_data = NULL; 1965 } 1966 1967 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 1968 struct cfg80211_bss *cbss, 1969 struct ieee80211_mgmt *mgmt, size_t len) 1970 { 1971 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1972 struct ieee80211_local *local = sdata->local; 1973 struct ieee80211_supported_band *sband; 1974 struct sta_info *sta; 1975 u8 *pos; 1976 u16 capab_info, aid; 1977 struct ieee802_11_elems elems; 1978 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1979 u32 changed = 0; 1980 int err; 1981 1982 /* AssocResp and ReassocResp have identical structure */ 1983 1984 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1985 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1986 1987 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1988 printk(KERN_DEBUG 1989 "%s: invalid AID value 0x%x; bits 15:14 not set\n", 1990 sdata->name, aid); 1991 aid &= ~(BIT(15) | BIT(14)); 1992 1993 ifmgd->broken_ap = false; 1994 1995 if (aid == 0 || aid > IEEE80211_MAX_AID) { 1996 printk(KERN_DEBUG 1997 "%s: invalid AID value %d (out of range), turn off PS\n", 1998 sdata->name, aid); 1999 aid = 0; 2000 ifmgd->broken_ap = true; 2001 } 2002 2003 pos = mgmt->u.assoc_resp.variable; 2004 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2005 2006 if (!elems.supp_rates) { 2007 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 2008 sdata->name); 2009 return false; 2010 } 2011 2012 ifmgd->aid = aid; 2013 2014 mutex_lock(&sdata->local->sta_mtx); 2015 /* 2016 * station info was already allocated and inserted before 2017 * the association and should be available to us 2018 */ 2019 sta = sta_info_get(sdata, cbss->bssid); 2020 if (WARN_ON(!sta)) { 2021 mutex_unlock(&sdata->local->sta_mtx); 2022 return false; 2023 } 2024 2025 sband = local->hw.wiphy->bands[local->oper_channel->band]; 2026 2027 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 2028 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2029 elems.ht_cap_elem, &sta->sta.ht_cap); 2030 2031 sta->supports_40mhz = 2032 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40; 2033 2034 rate_control_rate_init(sta); 2035 2036 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 2037 set_sta_flag(sta, WLAN_STA_MFP); 2038 2039 if (elems.wmm_param) 2040 set_sta_flag(sta, WLAN_STA_WME); 2041 2042 err = sta_info_move_state(sta, IEEE80211_STA_AUTH); 2043 if (!err) 2044 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 2045 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 2046 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 2047 if (err) { 2048 printk(KERN_DEBUG 2049 "%s: failed to move station %pM to desired state\n", 2050 sdata->name, sta->sta.addr); 2051 WARN_ON(__sta_info_destroy(sta)); 2052 mutex_unlock(&sdata->local->sta_mtx); 2053 return false; 2054 } 2055 2056 mutex_unlock(&sdata->local->sta_mtx); 2057 2058 /* 2059 * Always handle WMM once after association regardless 2060 * of the first value the AP uses. Setting -1 here has 2061 * that effect because the AP values is an unsigned 2062 * 4-bit value. 2063 */ 2064 ifmgd->wmm_last_param_set = -1; 2065 2066 if (elems.wmm_param) 2067 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2068 elems.wmm_param_len); 2069 else 2070 ieee80211_set_wmm_default(sdata, false); 2071 changed |= BSS_CHANGED_QOS; 2072 2073 if (elems.ht_operation && elems.wmm_param && 2074 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 2075 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, 2076 cbss->bssid, false); 2077 2078 /* set AID and assoc capability, 2079 * ieee80211_set_associated() will tell the driver */ 2080 bss_conf->aid = aid; 2081 bss_conf->assoc_capability = capab_info; 2082 ieee80211_set_associated(sdata, cbss, changed); 2083 2084 /* 2085 * If we're using 4-addr mode, let the AP know that we're 2086 * doing so, so that it can create the STA VLAN on its side 2087 */ 2088 if (ifmgd->use_4addr) 2089 ieee80211_send_4addr_nullfunc(local, sdata); 2090 2091 /* 2092 * Start timer to probe the connection to the AP now. 2093 * Also start the timer that will detect beacon loss. 2094 */ 2095 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 2096 ieee80211_sta_reset_beacon_monitor(sdata); 2097 2098 return true; 2099 } 2100 2101 static enum rx_mgmt_action __must_check 2102 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 2103 struct ieee80211_mgmt *mgmt, size_t len, 2104 struct cfg80211_bss **bss) 2105 { 2106 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2107 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2108 u16 capab_info, status_code, aid; 2109 struct ieee802_11_elems elems; 2110 u8 *pos; 2111 bool reassoc; 2112 2113 lockdep_assert_held(&ifmgd->mtx); 2114 2115 if (!assoc_data) 2116 return RX_MGMT_NONE; 2117 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 2118 return RX_MGMT_NONE; 2119 2120 /* 2121 * AssocResp and ReassocResp have identical structure, so process both 2122 * of them in this function. 2123 */ 2124 2125 if (len < 24 + 6) 2126 return RX_MGMT_NONE; 2127 2128 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 2129 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2130 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2131 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2132 2133 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x " 2134 "status=%d aid=%d)\n", 2135 sdata->name, reassoc ? "Rea" : "A", mgmt->sa, 2136 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 2137 2138 pos = mgmt->u.assoc_resp.variable; 2139 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2140 2141 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 2142 elems.timeout_int && elems.timeout_int_len == 5 && 2143 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) { 2144 u32 tu, ms; 2145 tu = get_unaligned_le32(elems.timeout_int + 1); 2146 ms = tu * 1024 / 1000; 2147 printk(KERN_DEBUG "%s: %pM rejected association temporarily; " 2148 "comeback duration %u TU (%u ms)\n", 2149 sdata->name, mgmt->sa, tu, ms); 2150 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 2151 if (ms > IEEE80211_ASSOC_TIMEOUT) 2152 run_again(ifmgd, assoc_data->timeout); 2153 return RX_MGMT_NONE; 2154 } 2155 2156 *bss = assoc_data->bss; 2157 2158 if (status_code != WLAN_STATUS_SUCCESS) { 2159 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n", 2160 sdata->name, mgmt->sa, status_code); 2161 ieee80211_destroy_assoc_data(sdata, false); 2162 } else { 2163 printk(KERN_DEBUG "%s: associated\n", sdata->name); 2164 2165 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) { 2166 /* oops -- internal error -- send timeout for now */ 2167 ieee80211_destroy_assoc_data(sdata, true); 2168 sta_info_destroy_addr(sdata, mgmt->bssid); 2169 cfg80211_put_bss(*bss); 2170 return RX_MGMT_CFG80211_ASSOC_TIMEOUT; 2171 } 2172 2173 /* 2174 * destroy assoc_data afterwards, as otherwise an idle 2175 * recalc after assoc_data is NULL but before associated 2176 * is set can cause the interface to go idle 2177 */ 2178 ieee80211_destroy_assoc_data(sdata, true); 2179 } 2180 2181 return RX_MGMT_CFG80211_RX_ASSOC; 2182 } 2183 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 2184 struct ieee80211_mgmt *mgmt, 2185 size_t len, 2186 struct ieee80211_rx_status *rx_status, 2187 struct ieee802_11_elems *elems, 2188 bool beacon) 2189 { 2190 struct ieee80211_local *local = sdata->local; 2191 int freq; 2192 struct ieee80211_bss *bss; 2193 struct ieee80211_channel *channel; 2194 bool need_ps = false; 2195 2196 if (sdata->u.mgd.associated && 2197 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) { 2198 bss = (void *)sdata->u.mgd.associated->priv; 2199 /* not previously set so we may need to recalc */ 2200 need_ps = !bss->dtim_period; 2201 } 2202 2203 if (elems->ds_params && elems->ds_params_len == 1) 2204 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 2205 rx_status->band); 2206 else 2207 freq = rx_status->freq; 2208 2209 channel = ieee80211_get_channel(local->hw.wiphy, freq); 2210 2211 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 2212 return; 2213 2214 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 2215 channel, beacon); 2216 if (bss) 2217 ieee80211_rx_bss_put(local, bss); 2218 2219 if (!sdata->u.mgd.associated) 2220 return; 2221 2222 if (need_ps) { 2223 mutex_lock(&local->iflist_mtx); 2224 ieee80211_recalc_ps(local, -1); 2225 mutex_unlock(&local->iflist_mtx); 2226 } 2227 2228 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 2229 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 2230 ETH_ALEN) == 0)) { 2231 struct ieee80211_channel_sw_ie *sw_elem = 2232 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 2233 ieee80211_sta_process_chanswitch(sdata, sw_elem, 2234 bss, rx_status->mactime); 2235 } 2236 } 2237 2238 2239 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 2240 struct sk_buff *skb) 2241 { 2242 struct ieee80211_mgmt *mgmt = (void *)skb->data; 2243 struct ieee80211_if_managed *ifmgd; 2244 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 2245 size_t baselen, len = skb->len; 2246 struct ieee802_11_elems elems; 2247 2248 ifmgd = &sdata->u.mgd; 2249 2250 ASSERT_MGD_MTX(ifmgd); 2251 2252 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 2253 return; /* ignore ProbeResp to foreign address */ 2254 2255 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 2256 if (baselen > len) 2257 return; 2258 2259 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 2260 &elems); 2261 2262 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 2263 2264 if (ifmgd->associated && 2265 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2266 ieee80211_reset_ap_probe(sdata); 2267 2268 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && 2269 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { 2270 /* got probe response, continue with auth */ 2271 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name); 2272 ifmgd->auth_data->tries = 0; 2273 ifmgd->auth_data->timeout = jiffies; 2274 run_again(ifmgd, ifmgd->auth_data->timeout); 2275 } 2276 } 2277 2278 /* 2279 * This is the canonical list of information elements we care about, 2280 * the filter code also gives us all changes to the Microsoft OUI 2281 * (00:50:F2) vendor IE which is used for WMM which we need to track. 2282 * 2283 * We implement beacon filtering in software since that means we can 2284 * avoid processing the frame here and in cfg80211, and userspace 2285 * will not be able to tell whether the hardware supports it or not. 2286 * 2287 * XXX: This list needs to be dynamic -- userspace needs to be able to 2288 * add items it requires. It also needs to be able to tell us to 2289 * look out for other vendor IEs. 2290 */ 2291 static const u64 care_about_ies = 2292 (1ULL << WLAN_EID_COUNTRY) | 2293 (1ULL << WLAN_EID_ERP_INFO) | 2294 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 2295 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 2296 (1ULL << WLAN_EID_HT_CAPABILITY) | 2297 (1ULL << WLAN_EID_HT_OPERATION); 2298 2299 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 2300 struct ieee80211_mgmt *mgmt, 2301 size_t len, 2302 struct ieee80211_rx_status *rx_status) 2303 { 2304 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2305 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2306 size_t baselen; 2307 struct ieee802_11_elems elems; 2308 struct ieee80211_local *local = sdata->local; 2309 u32 changed = 0; 2310 bool erp_valid, directed_tim = false; 2311 u8 erp_value = 0; 2312 u32 ncrc; 2313 u8 *bssid; 2314 2315 lockdep_assert_held(&ifmgd->mtx); 2316 2317 /* Process beacon from the current BSS */ 2318 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 2319 if (baselen > len) 2320 return; 2321 2322 if (rx_status->freq != local->hw.conf.channel->center_freq) 2323 return; 2324 2325 if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon && 2326 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2327 ieee802_11_parse_elems(mgmt->u.beacon.variable, 2328 len - baselen, &elems); 2329 2330 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 2331 false); 2332 ifmgd->assoc_data->have_beacon = true; 2333 ifmgd->assoc_data->sent_assoc = false; 2334 /* continue assoc process */ 2335 ifmgd->assoc_data->timeout = jiffies; 2336 run_again(ifmgd, ifmgd->assoc_data->timeout); 2337 return; 2338 } 2339 2340 if (!ifmgd->associated || 2341 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2342 return; 2343 bssid = ifmgd->associated->bssid; 2344 2345 /* Track average RSSI from the Beacon frames of the current AP */ 2346 ifmgd->last_beacon_signal = rx_status->signal; 2347 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 2348 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 2349 ifmgd->ave_beacon_signal = rx_status->signal * 16; 2350 ifmgd->last_cqm_event_signal = 0; 2351 ifmgd->count_beacon_signal = 1; 2352 ifmgd->last_ave_beacon_signal = 0; 2353 } else { 2354 ifmgd->ave_beacon_signal = 2355 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 2356 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 2357 ifmgd->ave_beacon_signal) / 16; 2358 ifmgd->count_beacon_signal++; 2359 } 2360 2361 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 2362 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 2363 int sig = ifmgd->ave_beacon_signal; 2364 int last_sig = ifmgd->last_ave_beacon_signal; 2365 2366 /* 2367 * if signal crosses either of the boundaries, invoke callback 2368 * with appropriate parameters 2369 */ 2370 if (sig > ifmgd->rssi_max_thold && 2371 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 2372 ifmgd->last_ave_beacon_signal = sig; 2373 drv_rssi_callback(local, RSSI_EVENT_HIGH); 2374 } else if (sig < ifmgd->rssi_min_thold && 2375 (last_sig >= ifmgd->rssi_max_thold || 2376 last_sig == 0)) { 2377 ifmgd->last_ave_beacon_signal = sig; 2378 drv_rssi_callback(local, RSSI_EVENT_LOW); 2379 } 2380 } 2381 2382 if (bss_conf->cqm_rssi_thold && 2383 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 2384 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 2385 int sig = ifmgd->ave_beacon_signal / 16; 2386 int last_event = ifmgd->last_cqm_event_signal; 2387 int thold = bss_conf->cqm_rssi_thold; 2388 int hyst = bss_conf->cqm_rssi_hyst; 2389 if (sig < thold && 2390 (last_event == 0 || sig < last_event - hyst)) { 2391 ifmgd->last_cqm_event_signal = sig; 2392 ieee80211_cqm_rssi_notify( 2393 &sdata->vif, 2394 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 2395 GFP_KERNEL); 2396 } else if (sig > thold && 2397 (last_event == 0 || sig > last_event + hyst)) { 2398 ifmgd->last_cqm_event_signal = sig; 2399 ieee80211_cqm_rssi_notify( 2400 &sdata->vif, 2401 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 2402 GFP_KERNEL); 2403 } 2404 } 2405 2406 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 2407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2408 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n", 2409 sdata->name); 2410 #endif 2411 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 2412 mutex_lock(&local->iflist_mtx); 2413 ieee80211_recalc_ps(local, -1); 2414 mutex_unlock(&local->iflist_mtx); 2415 } 2416 2417 /* 2418 * Push the beacon loss detection into the future since 2419 * we are processing a beacon from the AP just now. 2420 */ 2421 ieee80211_sta_reset_beacon_monitor(sdata); 2422 2423 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 2424 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 2425 len - baselen, &elems, 2426 care_about_ies, ncrc); 2427 2428 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 2429 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 2430 ifmgd->aid); 2431 2432 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 2433 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 2434 true); 2435 2436 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2437 elems.wmm_param_len); 2438 } 2439 2440 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 2441 if (directed_tim) { 2442 if (local->hw.conf.dynamic_ps_timeout > 0) { 2443 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2444 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2445 ieee80211_hw_config(local, 2446 IEEE80211_CONF_CHANGE_PS); 2447 } 2448 ieee80211_send_nullfunc(local, sdata, 0); 2449 } else if (!local->pspolling && sdata->u.mgd.powersave) { 2450 local->pspolling = true; 2451 2452 /* 2453 * Here is assumed that the driver will be 2454 * able to send ps-poll frame and receive a 2455 * response even though power save mode is 2456 * enabled, but some drivers might require 2457 * to disable power save here. This needs 2458 * to be investigated. 2459 */ 2460 ieee80211_send_pspoll(local, sdata); 2461 } 2462 } 2463 } 2464 2465 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 2466 return; 2467 ifmgd->beacon_crc = ncrc; 2468 ifmgd->beacon_crc_valid = true; 2469 2470 if (elems.erp_info && elems.erp_info_len >= 1) { 2471 erp_valid = true; 2472 erp_value = elems.erp_info[0]; 2473 } else { 2474 erp_valid = false; 2475 } 2476 changed |= ieee80211_handle_bss_capability(sdata, 2477 le16_to_cpu(mgmt->u.beacon.capab_info), 2478 erp_valid, erp_value); 2479 2480 2481 if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param && 2482 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 2483 struct ieee80211_supported_band *sband; 2484 2485 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 2486 2487 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, 2488 bssid, true); 2489 } 2490 2491 /* Note: country IE parsing is done for us by cfg80211 */ 2492 if (elems.country_elem) { 2493 /* TODO: IBSS also needs this */ 2494 if (elems.pwr_constr_elem) 2495 ieee80211_handle_pwr_constr(sdata, 2496 le16_to_cpu(mgmt->u.probe_resp.capab_info), 2497 elems.pwr_constr_elem, 2498 elems.pwr_constr_elem_len); 2499 } 2500 2501 ieee80211_bss_info_change_notify(sdata, changed); 2502 } 2503 2504 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 2505 struct sk_buff *skb) 2506 { 2507 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2508 struct ieee80211_rx_status *rx_status; 2509 struct ieee80211_mgmt *mgmt; 2510 struct cfg80211_bss *bss = NULL; 2511 enum rx_mgmt_action rma = RX_MGMT_NONE; 2512 u16 fc; 2513 2514 rx_status = (struct ieee80211_rx_status *) skb->cb; 2515 mgmt = (struct ieee80211_mgmt *) skb->data; 2516 fc = le16_to_cpu(mgmt->frame_control); 2517 2518 mutex_lock(&ifmgd->mtx); 2519 2520 switch (fc & IEEE80211_FCTL_STYPE) { 2521 case IEEE80211_STYPE_BEACON: 2522 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 2523 break; 2524 case IEEE80211_STYPE_PROBE_RESP: 2525 ieee80211_rx_mgmt_probe_resp(sdata, skb); 2526 break; 2527 case IEEE80211_STYPE_AUTH: 2528 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 2529 break; 2530 case IEEE80211_STYPE_DEAUTH: 2531 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 2532 break; 2533 case IEEE80211_STYPE_DISASSOC: 2534 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 2535 break; 2536 case IEEE80211_STYPE_ASSOC_RESP: 2537 case IEEE80211_STYPE_REASSOC_RESP: 2538 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss); 2539 break; 2540 case IEEE80211_STYPE_ACTION: 2541 switch (mgmt->u.action.category) { 2542 case WLAN_CATEGORY_SPECTRUM_MGMT: 2543 ieee80211_sta_process_chanswitch(sdata, 2544 &mgmt->u.action.u.chan_switch.sw_elem, 2545 (void *)ifmgd->associated->priv, 2546 rx_status->mactime); 2547 break; 2548 } 2549 } 2550 mutex_unlock(&ifmgd->mtx); 2551 2552 switch (rma) { 2553 case RX_MGMT_NONE: 2554 /* no action */ 2555 break; 2556 case RX_MGMT_CFG80211_DEAUTH: 2557 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2558 break; 2559 case RX_MGMT_CFG80211_DISASSOC: 2560 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 2561 break; 2562 case RX_MGMT_CFG80211_RX_AUTH: 2563 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len); 2564 break; 2565 case RX_MGMT_CFG80211_RX_ASSOC: 2566 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len); 2567 break; 2568 case RX_MGMT_CFG80211_ASSOC_TIMEOUT: 2569 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid); 2570 break; 2571 default: 2572 WARN(1, "unexpected: %d", rma); 2573 } 2574 } 2575 2576 static void ieee80211_sta_timer(unsigned long data) 2577 { 2578 struct ieee80211_sub_if_data *sdata = 2579 (struct ieee80211_sub_if_data *) data; 2580 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2581 struct ieee80211_local *local = sdata->local; 2582 2583 if (local->quiescing) { 2584 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2585 return; 2586 } 2587 2588 ieee80211_queue_work(&local->hw, &sdata->work); 2589 } 2590 2591 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2592 u8 *bssid, u8 reason) 2593 { 2594 struct ieee80211_local *local = sdata->local; 2595 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2596 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 2597 2598 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL | 2599 IEEE80211_STA_BEACON_POLL); 2600 2601 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 2602 false, frame_buf); 2603 mutex_unlock(&ifmgd->mtx); 2604 2605 /* 2606 * must be outside lock due to cfg80211, 2607 * but that's not a problem. 2608 */ 2609 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 2610 2611 mutex_lock(&local->mtx); 2612 ieee80211_recalc_idle(local); 2613 mutex_unlock(&local->mtx); 2614 2615 mutex_lock(&ifmgd->mtx); 2616 } 2617 2618 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) 2619 { 2620 struct ieee80211_local *local = sdata->local; 2621 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2622 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 2623 2624 lockdep_assert_held(&ifmgd->mtx); 2625 2626 if (WARN_ON_ONCE(!auth_data)) 2627 return -EINVAL; 2628 2629 auth_data->tries++; 2630 2631 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 2632 printk(KERN_DEBUG "%s: authentication with %pM timed out\n", 2633 sdata->name, auth_data->bss->bssid); 2634 2635 /* 2636 * Most likely AP is not in the range so remove the 2637 * bss struct for that AP. 2638 */ 2639 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 2640 2641 return -ETIMEDOUT; 2642 } 2643 2644 if (auth_data->bss->proberesp_ies) { 2645 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n", 2646 sdata->name, auth_data->bss->bssid, auth_data->tries, 2647 IEEE80211_AUTH_MAX_TRIES); 2648 2649 auth_data->expected_transaction = 2; 2650 ieee80211_send_auth(sdata, 1, auth_data->algorithm, 2651 auth_data->ie, auth_data->ie_len, 2652 auth_data->bss->bssid, 2653 auth_data->bss->bssid, NULL, 0, 0); 2654 } else { 2655 const u8 *ssidie; 2656 2657 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n", 2658 sdata->name, auth_data->bss->bssid, auth_data->tries, 2659 IEEE80211_AUTH_MAX_TRIES); 2660 2661 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); 2662 if (!ssidie) 2663 return -EINVAL; 2664 /* 2665 * Direct probe is sent to broadcast address as some APs 2666 * will not answer to direct packet in unassociated state. 2667 */ 2668 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1], 2669 NULL, 0, (u32) -1, true, false); 2670 } 2671 2672 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 2673 run_again(ifmgd, auth_data->timeout); 2674 2675 return 0; 2676 } 2677 2678 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 2679 { 2680 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2681 struct ieee80211_local *local = sdata->local; 2682 2683 lockdep_assert_held(&sdata->u.mgd.mtx); 2684 2685 assoc_data->tries++; 2686 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 2687 printk(KERN_DEBUG "%s: association with %pM timed out\n", 2688 sdata->name, assoc_data->bss->bssid); 2689 2690 /* 2691 * Most likely AP is not in the range so remove the 2692 * bss struct for that AP. 2693 */ 2694 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 2695 2696 return -ETIMEDOUT; 2697 } 2698 2699 printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n", 2700 sdata->name, assoc_data->bss->bssid, assoc_data->tries, 2701 IEEE80211_ASSOC_MAX_TRIES); 2702 ieee80211_send_assoc(sdata); 2703 2704 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 2705 run_again(&sdata->u.mgd, assoc_data->timeout); 2706 2707 return 0; 2708 } 2709 2710 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2711 { 2712 struct ieee80211_local *local = sdata->local; 2713 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2714 2715 mutex_lock(&ifmgd->mtx); 2716 2717 if (ifmgd->auth_data && 2718 time_after(jiffies, ifmgd->auth_data->timeout)) { 2719 if (ifmgd->auth_data->done) { 2720 /* 2721 * ok ... we waited for assoc but userspace didn't, 2722 * so let's just kill the auth data 2723 */ 2724 ieee80211_destroy_auth_data(sdata, false); 2725 } else if (ieee80211_probe_auth(sdata)) { 2726 u8 bssid[ETH_ALEN]; 2727 2728 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2729 2730 ieee80211_destroy_auth_data(sdata, false); 2731 2732 mutex_unlock(&ifmgd->mtx); 2733 cfg80211_send_auth_timeout(sdata->dev, bssid); 2734 mutex_lock(&ifmgd->mtx); 2735 } 2736 } else if (ifmgd->auth_data) 2737 run_again(ifmgd, ifmgd->auth_data->timeout); 2738 2739 if (ifmgd->assoc_data && 2740 time_after(jiffies, ifmgd->assoc_data->timeout)) { 2741 if (!ifmgd->assoc_data->have_beacon || 2742 ieee80211_do_assoc(sdata)) { 2743 u8 bssid[ETH_ALEN]; 2744 2745 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN); 2746 2747 ieee80211_destroy_assoc_data(sdata, false); 2748 2749 mutex_unlock(&ifmgd->mtx); 2750 cfg80211_send_assoc_timeout(sdata->dev, bssid); 2751 mutex_lock(&ifmgd->mtx); 2752 } 2753 } else if (ifmgd->assoc_data) 2754 run_again(ifmgd, ifmgd->assoc_data->timeout); 2755 2756 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2757 IEEE80211_STA_CONNECTION_POLL) && 2758 ifmgd->associated) { 2759 u8 bssid[ETH_ALEN]; 2760 int max_tries; 2761 2762 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2763 2764 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2765 max_tries = max_nullfunc_tries; 2766 else 2767 max_tries = max_probe_tries; 2768 2769 /* ACK received for nullfunc probing frame */ 2770 if (!ifmgd->probe_send_count) 2771 ieee80211_reset_ap_probe(sdata); 2772 else if (ifmgd->nullfunc_failed) { 2773 if (ifmgd->probe_send_count < max_tries) { 2774 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2775 wiphy_debug(local->hw.wiphy, 2776 "%s: No ack for nullfunc frame to" 2777 " AP %pM, try %d/%i\n", 2778 sdata->name, bssid, 2779 ifmgd->probe_send_count, max_tries); 2780 #endif 2781 ieee80211_mgd_probe_ap_send(sdata); 2782 } else { 2783 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2784 wiphy_debug(local->hw.wiphy, 2785 "%s: No ack for nullfunc frame to" 2786 " AP %pM, disconnecting.\n", 2787 sdata->name, bssid); 2788 #endif 2789 ieee80211_sta_connection_lost(sdata, bssid, 2790 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2791 } 2792 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2793 run_again(ifmgd, ifmgd->probe_timeout); 2794 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2795 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2796 wiphy_debug(local->hw.wiphy, 2797 "%s: Failed to send nullfunc to AP %pM" 2798 " after %dms, disconnecting.\n", 2799 sdata->name, 2800 bssid, probe_wait_ms); 2801 #endif 2802 ieee80211_sta_connection_lost(sdata, bssid, 2803 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2804 } else if (ifmgd->probe_send_count < max_tries) { 2805 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2806 wiphy_debug(local->hw.wiphy, 2807 "%s: No probe response from AP %pM" 2808 " after %dms, try %d/%i\n", 2809 sdata->name, 2810 bssid, probe_wait_ms, 2811 ifmgd->probe_send_count, max_tries); 2812 #endif 2813 ieee80211_mgd_probe_ap_send(sdata); 2814 } else { 2815 /* 2816 * We actually lost the connection ... or did we? 2817 * Let's make sure! 2818 */ 2819 wiphy_debug(local->hw.wiphy, 2820 "%s: No probe response from AP %pM" 2821 " after %dms, disconnecting.\n", 2822 sdata->name, 2823 bssid, probe_wait_ms); 2824 2825 ieee80211_sta_connection_lost(sdata, bssid, 2826 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2827 } 2828 } 2829 2830 mutex_unlock(&ifmgd->mtx); 2831 2832 mutex_lock(&local->mtx); 2833 ieee80211_recalc_idle(local); 2834 mutex_unlock(&local->mtx); 2835 } 2836 2837 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2838 { 2839 struct ieee80211_sub_if_data *sdata = 2840 (struct ieee80211_sub_if_data *) data; 2841 struct ieee80211_local *local = sdata->local; 2842 2843 if (local->quiescing) 2844 return; 2845 2846 ieee80211_queue_work(&sdata->local->hw, 2847 &sdata->u.mgd.beacon_connection_loss_work); 2848 } 2849 2850 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2851 { 2852 struct ieee80211_sub_if_data *sdata = 2853 (struct ieee80211_sub_if_data *) data; 2854 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2855 struct ieee80211_local *local = sdata->local; 2856 2857 if (local->quiescing) 2858 return; 2859 2860 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2861 } 2862 2863 static void ieee80211_sta_monitor_work(struct work_struct *work) 2864 { 2865 struct ieee80211_sub_if_data *sdata = 2866 container_of(work, struct ieee80211_sub_if_data, 2867 u.mgd.monitor_work); 2868 2869 ieee80211_mgd_probe_ap(sdata, false); 2870 } 2871 2872 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2873 { 2874 u32 flags; 2875 2876 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2877 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL | 2878 IEEE80211_STA_CONNECTION_POLL); 2879 2880 /* let's probe the connection once */ 2881 flags = sdata->local->hw.flags; 2882 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) 2883 ieee80211_queue_work(&sdata->local->hw, 2884 &sdata->u.mgd.monitor_work); 2885 /* and do all the other regular work too */ 2886 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2887 } 2888 } 2889 2890 #ifdef CONFIG_PM 2891 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2892 { 2893 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2894 2895 /* 2896 * we need to use atomic bitops for the running bits 2897 * only because both timers might fire at the same 2898 * time -- the code here is properly synchronised. 2899 */ 2900 2901 cancel_work_sync(&ifmgd->request_smps_work); 2902 2903 cancel_work_sync(&ifmgd->monitor_work); 2904 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2905 if (del_timer_sync(&ifmgd->timer)) 2906 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2907 2908 cancel_work_sync(&ifmgd->chswitch_work); 2909 if (del_timer_sync(&ifmgd->chswitch_timer)) 2910 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2911 2912 /* these will just be re-established on connection */ 2913 del_timer_sync(&ifmgd->conn_mon_timer); 2914 del_timer_sync(&ifmgd->bcn_mon_timer); 2915 } 2916 2917 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2918 { 2919 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2920 2921 if (!ifmgd->associated) 2922 return; 2923 2924 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2925 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2926 mutex_lock(&ifmgd->mtx); 2927 if (ifmgd->associated) { 2928 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2929 wiphy_debug(sdata->local->hw.wiphy, 2930 "%s: driver requested disconnect after resume.\n", 2931 sdata->name); 2932 #endif 2933 ieee80211_sta_connection_lost(sdata, 2934 ifmgd->associated->bssid, 2935 WLAN_REASON_UNSPECIFIED); 2936 mutex_unlock(&ifmgd->mtx); 2937 return; 2938 } 2939 mutex_unlock(&ifmgd->mtx); 2940 } 2941 2942 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2943 add_timer(&ifmgd->timer); 2944 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2945 add_timer(&ifmgd->chswitch_timer); 2946 ieee80211_sta_reset_beacon_monitor(sdata); 2947 ieee80211_restart_sta_timer(sdata); 2948 } 2949 #endif 2950 2951 /* interface setup */ 2952 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2953 { 2954 struct ieee80211_if_managed *ifmgd; 2955 2956 ifmgd = &sdata->u.mgd; 2957 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2958 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2959 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2960 ieee80211_beacon_connection_loss_work); 2961 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2962 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2963 (unsigned long) sdata); 2964 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2965 (unsigned long) sdata); 2966 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2967 (unsigned long) sdata); 2968 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2969 (unsigned long) sdata); 2970 2971 ifmgd->flags = 0; 2972 ifmgd->powersave = sdata->wdev.ps; 2973 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 2974 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 2975 2976 mutex_init(&ifmgd->mtx); 2977 2978 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2979 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2980 else 2981 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2982 } 2983 2984 /* scan finished notification */ 2985 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2986 { 2987 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2988 2989 /* Restart STA timers */ 2990 rcu_read_lock(); 2991 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2992 ieee80211_restart_sta_timer(sdata); 2993 rcu_read_unlock(); 2994 } 2995 2996 int ieee80211_max_network_latency(struct notifier_block *nb, 2997 unsigned long data, void *dummy) 2998 { 2999 s32 latency_usec = (s32) data; 3000 struct ieee80211_local *local = 3001 container_of(nb, struct ieee80211_local, 3002 network_latency_notifier); 3003 3004 mutex_lock(&local->iflist_mtx); 3005 ieee80211_recalc_ps(local, latency_usec); 3006 mutex_unlock(&local->iflist_mtx); 3007 3008 return 0; 3009 } 3010 3011 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 3012 struct cfg80211_bss *cbss, bool assoc) 3013 { 3014 struct ieee80211_local *local = sdata->local; 3015 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3016 struct ieee80211_bss *bss = (void *)cbss->priv; 3017 struct sta_info *sta; 3018 bool have_sta = false; 3019 int err; 3020 int ht_cfreq; 3021 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 3022 const u8 *ht_oper_ie; 3023 const struct ieee80211_ht_operation *ht_oper = NULL; 3024 struct ieee80211_supported_band *sband; 3025 3026 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 3027 return -EINVAL; 3028 3029 if (assoc) { 3030 rcu_read_lock(); 3031 have_sta = sta_info_get(sdata, cbss->bssid); 3032 rcu_read_unlock(); 3033 } 3034 3035 if (!have_sta) { 3036 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 3037 if (!sta) 3038 return -ENOMEM; 3039 } 3040 3041 mutex_lock(&local->mtx); 3042 ieee80211_recalc_idle(sdata->local); 3043 mutex_unlock(&local->mtx); 3044 3045 /* switch to the right channel */ 3046 sband = local->hw.wiphy->bands[cbss->channel->band]; 3047 3048 ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ; 3049 3050 if (sband->ht_cap.ht_supported) { 3051 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION, 3052 cbss->information_elements, 3053 cbss->len_information_elements); 3054 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 3055 ht_oper = (void *)(ht_oper_ie + 2); 3056 } 3057 3058 if (ht_oper) { 3059 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 3060 cbss->channel->band); 3061 /* check that channel matches the right operating channel */ 3062 if (cbss->channel->center_freq != ht_cfreq) { 3063 /* 3064 * It's possible that some APs are confused here; 3065 * Netgear WNDR3700 sometimes reports 4 higher than 3066 * the actual channel in association responses, but 3067 * since we look at probe response/beacon data here 3068 * it should be OK. 3069 */ 3070 printk(KERN_DEBUG 3071 "%s: Wrong control channel: center-freq: %d" 3072 " ht-cfreq: %d ht->primary_chan: %d" 3073 " band: %d. Disabling HT.\n", 3074 sdata->name, cbss->channel->center_freq, 3075 ht_cfreq, ht_oper->primary_chan, 3076 cbss->channel->band); 3077 ht_oper = NULL; 3078 } 3079 } 3080 3081 if (ht_oper) { 3082 channel_type = NL80211_CHAN_HT20; 3083 3084 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 3085 switch (ht_oper->ht_param & 3086 IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 3087 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 3088 channel_type = NL80211_CHAN_HT40PLUS; 3089 break; 3090 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 3091 channel_type = NL80211_CHAN_HT40MINUS; 3092 break; 3093 } 3094 } 3095 } 3096 3097 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 3098 /* can only fail due to HT40+/- mismatch */ 3099 channel_type = NL80211_CHAN_HT20; 3100 printk(KERN_DEBUG 3101 "%s: disabling 40 MHz due to multi-vif mismatch\n", 3102 sdata->name); 3103 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ; 3104 WARN_ON(!ieee80211_set_channel_type(local, sdata, 3105 channel_type)); 3106 } 3107 3108 local->oper_channel = cbss->channel; 3109 ieee80211_hw_config(local, 0); 3110 3111 if (!have_sta) { 3112 u32 rates = 0, basic_rates = 0; 3113 bool have_higher_than_11mbit; 3114 int min_rate = INT_MAX, min_rate_index = -1; 3115 3116 ieee80211_get_rates(sband, bss->supp_rates, 3117 bss->supp_rates_len, 3118 &rates, &basic_rates, 3119 &have_higher_than_11mbit, 3120 &min_rate, &min_rate_index); 3121 3122 /* 3123 * This used to be a workaround for basic rates missing 3124 * in the association response frame. Now that we no 3125 * longer use the basic rates from there, it probably 3126 * doesn't happen any more, but keep the workaround so 3127 * in case some *other* APs are buggy in different ways 3128 * we can connect -- with a warning. 3129 */ 3130 if (!basic_rates && min_rate_index >= 0) { 3131 printk(KERN_DEBUG 3132 "%s: No basic rates, using min rate instead.\n", 3133 sdata->name); 3134 basic_rates = BIT(min_rate_index); 3135 } 3136 3137 sta->sta.supp_rates[cbss->channel->band] = rates; 3138 sdata->vif.bss_conf.basic_rates = basic_rates; 3139 3140 /* cf. IEEE 802.11 9.2.12 */ 3141 if (local->oper_channel->band == IEEE80211_BAND_2GHZ && 3142 have_higher_than_11mbit) 3143 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 3144 else 3145 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 3146 3147 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 3148 3149 /* tell driver about BSSID and basic rates */ 3150 ieee80211_bss_info_change_notify(sdata, 3151 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES); 3152 3153 if (assoc) 3154 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 3155 3156 err = sta_info_insert(sta); 3157 sta = NULL; 3158 if (err) { 3159 printk(KERN_DEBUG 3160 "%s: failed to insert STA entry for the AP (error %d)\n", 3161 sdata->name, err); 3162 return err; 3163 } 3164 } else 3165 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 3166 3167 return 0; 3168 } 3169 3170 /* config hooks */ 3171 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 3172 struct cfg80211_auth_request *req) 3173 { 3174 struct ieee80211_local *local = sdata->local; 3175 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3176 struct ieee80211_mgd_auth_data *auth_data; 3177 u16 auth_alg; 3178 int err; 3179 3180 /* prepare auth data structure */ 3181 3182 switch (req->auth_type) { 3183 case NL80211_AUTHTYPE_OPEN_SYSTEM: 3184 auth_alg = WLAN_AUTH_OPEN; 3185 break; 3186 case NL80211_AUTHTYPE_SHARED_KEY: 3187 if (IS_ERR(local->wep_tx_tfm)) 3188 return -EOPNOTSUPP; 3189 auth_alg = WLAN_AUTH_SHARED_KEY; 3190 break; 3191 case NL80211_AUTHTYPE_FT: 3192 auth_alg = WLAN_AUTH_FT; 3193 break; 3194 case NL80211_AUTHTYPE_NETWORK_EAP: 3195 auth_alg = WLAN_AUTH_LEAP; 3196 break; 3197 default: 3198 return -EOPNOTSUPP; 3199 } 3200 3201 auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL); 3202 if (!auth_data) 3203 return -ENOMEM; 3204 3205 auth_data->bss = req->bss; 3206 3207 if (req->ie && req->ie_len) { 3208 memcpy(auth_data->ie, req->ie, req->ie_len); 3209 auth_data->ie_len = req->ie_len; 3210 } 3211 3212 if (req->key && req->key_len) { 3213 auth_data->key_len = req->key_len; 3214 auth_data->key_idx = req->key_idx; 3215 memcpy(auth_data->key, req->key, req->key_len); 3216 } 3217 3218 auth_data->algorithm = auth_alg; 3219 3220 /* try to authenticate/probe */ 3221 3222 mutex_lock(&ifmgd->mtx); 3223 3224 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 3225 ifmgd->assoc_data) { 3226 err = -EBUSY; 3227 goto err_free; 3228 } 3229 3230 if (ifmgd->auth_data) 3231 ieee80211_destroy_auth_data(sdata, false); 3232 3233 /* prep auth_data so we don't go into idle on disassoc */ 3234 ifmgd->auth_data = auth_data; 3235 3236 if (ifmgd->associated) 3237 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 3238 3239 printk(KERN_DEBUG "%s: authenticate with %pM\n", 3240 sdata->name, req->bss->bssid); 3241 3242 err = ieee80211_prep_connection(sdata, req->bss, false); 3243 if (err) 3244 goto err_clear; 3245 3246 err = ieee80211_probe_auth(sdata); 3247 if (err) { 3248 sta_info_destroy_addr(sdata, req->bss->bssid); 3249 goto err_clear; 3250 } 3251 3252 /* hold our own reference */ 3253 cfg80211_ref_bss(auth_data->bss); 3254 err = 0; 3255 goto out_unlock; 3256 3257 err_clear: 3258 ifmgd->auth_data = NULL; 3259 err_free: 3260 kfree(auth_data); 3261 out_unlock: 3262 mutex_unlock(&ifmgd->mtx); 3263 3264 return err; 3265 } 3266 3267 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 3268 struct cfg80211_assoc_request *req) 3269 { 3270 struct ieee80211_local *local = sdata->local; 3271 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3272 struct ieee80211_bss *bss = (void *)req->bss->priv; 3273 struct ieee80211_mgd_assoc_data *assoc_data; 3274 struct ieee80211_supported_band *sband; 3275 const u8 *ssidie; 3276 int i, err; 3277 3278 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 3279 if (!ssidie) 3280 return -EINVAL; 3281 3282 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 3283 if (!assoc_data) 3284 return -ENOMEM; 3285 3286 mutex_lock(&ifmgd->mtx); 3287 3288 if (ifmgd->associated) 3289 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 3290 3291 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 3292 err = -EBUSY; 3293 goto err_free; 3294 } 3295 3296 if (ifmgd->assoc_data) { 3297 err = -EBUSY; 3298 goto err_free; 3299 } 3300 3301 if (ifmgd->auth_data) { 3302 bool match; 3303 3304 /* keep sta info, bssid if matching */ 3305 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 3306 ieee80211_destroy_auth_data(sdata, match); 3307 } 3308 3309 /* prepare assoc data */ 3310 3311 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 3312 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 3313 3314 ifmgd->beacon_crc_valid = false; 3315 3316 /* 3317 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 3318 * We still associate in non-HT mode (11a/b/g) if any one of these 3319 * ciphers is configured as pairwise. 3320 * We can set this to true for non-11n hardware, that'll be checked 3321 * separately along with the peer capabilities. 3322 */ 3323 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 3324 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 3325 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 3326 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 3327 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3328 3329 if (req->flags & ASSOC_REQ_DISABLE_HT) 3330 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3331 3332 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 3333 sband = local->hw.wiphy->bands[req->bss->channel->band]; 3334 if (!sband->ht_cap.ht_supported || 3335 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) 3336 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3337 3338 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 3339 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 3340 sizeof(ifmgd->ht_capa_mask)); 3341 3342 if (req->ie && req->ie_len) { 3343 memcpy(assoc_data->ie, req->ie, req->ie_len); 3344 assoc_data->ie_len = req->ie_len; 3345 } 3346 3347 assoc_data->bss = req->bss; 3348 3349 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 3350 if (ifmgd->powersave) 3351 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 3352 else 3353 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 3354 } else 3355 ifmgd->ap_smps = ifmgd->req_smps; 3356 3357 assoc_data->capability = req->bss->capability; 3358 assoc_data->wmm = bss->wmm_used && 3359 (local->hw.queues >= IEEE80211_NUM_ACS); 3360 assoc_data->supp_rates = bss->supp_rates; 3361 assoc_data->supp_rates_len = bss->supp_rates_len; 3362 assoc_data->ht_operation_ie = 3363 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 3364 3365 if (bss->wmm_used && bss->uapsd_supported && 3366 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 3367 assoc_data->uapsd = true; 3368 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 3369 } else { 3370 assoc_data->uapsd = false; 3371 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 3372 } 3373 3374 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 3375 assoc_data->ssid_len = ssidie[1]; 3376 3377 if (req->prev_bssid) 3378 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 3379 3380 if (req->use_mfp) { 3381 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 3382 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 3383 } else { 3384 ifmgd->mfp = IEEE80211_MFP_DISABLED; 3385 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 3386 } 3387 3388 if (req->crypto.control_port) 3389 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 3390 else 3391 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 3392 3393 sdata->control_port_protocol = req->crypto.control_port_ethertype; 3394 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 3395 3396 /* kick off associate process */ 3397 3398 ifmgd->assoc_data = assoc_data; 3399 3400 err = ieee80211_prep_connection(sdata, req->bss, true); 3401 if (err) 3402 goto err_clear; 3403 3404 if (!bss->dtim_period && 3405 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) { 3406 /* 3407 * Wait up to one beacon interval ... 3408 * should this be more if we miss one? 3409 */ 3410 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n", 3411 sdata->name, ifmgd->bssid); 3412 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 3413 } else { 3414 assoc_data->have_beacon = true; 3415 assoc_data->sent_assoc = false; 3416 assoc_data->timeout = jiffies; 3417 } 3418 run_again(ifmgd, assoc_data->timeout); 3419 3420 if (bss->corrupt_data) { 3421 char *corrupt_type = "data"; 3422 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 3423 if (bss->corrupt_data & 3424 IEEE80211_BSS_CORRUPT_PROBE_RESP) 3425 corrupt_type = "beacon and probe response"; 3426 else 3427 corrupt_type = "beacon"; 3428 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 3429 corrupt_type = "probe response"; 3430 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n", 3431 sdata->name, corrupt_type); 3432 } 3433 3434 err = 0; 3435 goto out; 3436 err_clear: 3437 ifmgd->assoc_data = NULL; 3438 err_free: 3439 kfree(assoc_data); 3440 out: 3441 mutex_unlock(&ifmgd->mtx); 3442 3443 return err; 3444 } 3445 3446 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 3447 struct cfg80211_deauth_request *req) 3448 { 3449 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3450 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 3451 3452 mutex_lock(&ifmgd->mtx); 3453 3454 if (ifmgd->auth_data) { 3455 ieee80211_destroy_auth_data(sdata, false); 3456 mutex_unlock(&ifmgd->mtx); 3457 return 0; 3458 } 3459 3460 printk(KERN_DEBUG 3461 "%s: deauthenticating from %pM by local choice (reason=%d)\n", 3462 sdata->name, req->bssid, req->reason_code); 3463 3464 if (ifmgd->associated && 3465 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) 3466 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3467 req->reason_code, true, frame_buf); 3468 else 3469 ieee80211_send_deauth_disassoc(sdata, req->bssid, 3470 IEEE80211_STYPE_DEAUTH, 3471 req->reason_code, true, 3472 frame_buf); 3473 mutex_unlock(&ifmgd->mtx); 3474 3475 __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 3476 3477 mutex_lock(&sdata->local->mtx); 3478 ieee80211_recalc_idle(sdata->local); 3479 mutex_unlock(&sdata->local->mtx); 3480 3481 return 0; 3482 } 3483 3484 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 3485 struct cfg80211_disassoc_request *req) 3486 { 3487 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3488 u8 bssid[ETH_ALEN]; 3489 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 3490 3491 mutex_lock(&ifmgd->mtx); 3492 3493 /* 3494 * cfg80211 should catch this ... but it's racy since 3495 * we can receive a disassoc frame, process it, hand it 3496 * to cfg80211 while that's in a locked section already 3497 * trying to tell us that the user wants to disconnect. 3498 */ 3499 if (ifmgd->associated != req->bss) { 3500 mutex_unlock(&ifmgd->mtx); 3501 return -ENOLINK; 3502 } 3503 3504 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 3505 sdata->name, req->bss->bssid, req->reason_code); 3506 3507 memcpy(bssid, req->bss->bssid, ETH_ALEN); 3508 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 3509 req->reason_code, !req->local_state_change, 3510 frame_buf); 3511 mutex_unlock(&ifmgd->mtx); 3512 3513 __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 3514 3515 mutex_lock(&sdata->local->mtx); 3516 ieee80211_recalc_idle(sdata->local); 3517 mutex_unlock(&sdata->local->mtx); 3518 3519 return 0; 3520 } 3521 3522 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 3523 { 3524 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3525 3526 mutex_lock(&ifmgd->mtx); 3527 if (ifmgd->assoc_data) 3528 ieee80211_destroy_assoc_data(sdata, false); 3529 if (ifmgd->auth_data) 3530 ieee80211_destroy_auth_data(sdata, false); 3531 del_timer_sync(&ifmgd->timer); 3532 mutex_unlock(&ifmgd->mtx); 3533 } 3534 3535 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 3536 enum nl80211_cqm_rssi_threshold_event rssi_event, 3537 gfp_t gfp) 3538 { 3539 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3540 3541 trace_api_cqm_rssi_notify(sdata, rssi_event); 3542 3543 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 3544 } 3545 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 3546 3547 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 3548 { 3549 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3550 return sdata->dev->operstate; 3551 } 3552 EXPORT_SYMBOL(ieee80211_get_operstate); 3553