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 void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1224 { 1225 lockdep_assert_held(&sdata->local->mtx); 1226 1227 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1228 IEEE80211_STA_BEACON_POLL); 1229 ieee80211_run_deferred_scan(sdata->local); 1230 } 1231 1232 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1233 { 1234 mutex_lock(&sdata->local->mtx); 1235 __ieee80211_stop_poll(sdata); 1236 mutex_unlock(&sdata->local->mtx); 1237 } 1238 1239 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1240 u16 capab, bool erp_valid, u8 erp) 1241 { 1242 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1243 u32 changed = 0; 1244 bool use_protection; 1245 bool use_short_preamble; 1246 bool use_short_slot; 1247 1248 if (erp_valid) { 1249 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1250 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1251 } else { 1252 use_protection = false; 1253 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1254 } 1255 1256 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1257 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) 1258 use_short_slot = true; 1259 1260 if (use_protection != bss_conf->use_cts_prot) { 1261 bss_conf->use_cts_prot = use_protection; 1262 changed |= BSS_CHANGED_ERP_CTS_PROT; 1263 } 1264 1265 if (use_short_preamble != bss_conf->use_short_preamble) { 1266 bss_conf->use_short_preamble = use_short_preamble; 1267 changed |= BSS_CHANGED_ERP_PREAMBLE; 1268 } 1269 1270 if (use_short_slot != bss_conf->use_short_slot) { 1271 bss_conf->use_short_slot = use_short_slot; 1272 changed |= BSS_CHANGED_ERP_SLOT; 1273 } 1274 1275 return changed; 1276 } 1277 1278 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1279 struct cfg80211_bss *cbss, 1280 u32 bss_info_changed) 1281 { 1282 struct ieee80211_bss *bss = (void *)cbss->priv; 1283 struct ieee80211_local *local = sdata->local; 1284 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1285 1286 bss_info_changed |= BSS_CHANGED_ASSOC; 1287 /* set timing information */ 1288 bss_conf->beacon_int = cbss->beacon_interval; 1289 bss_conf->last_tsf = cbss->tsf; 1290 1291 bss_info_changed |= BSS_CHANGED_BEACON_INT; 1292 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1293 cbss->capability, bss->has_erp_value, bss->erp_value); 1294 1295 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1296 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1297 1298 sdata->u.mgd.associated = cbss; 1299 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1300 1301 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1302 1303 /* just to be sure */ 1304 ieee80211_stop_poll(sdata); 1305 1306 ieee80211_led_assoc(local, 1); 1307 1308 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) 1309 bss_conf->dtim_period = bss->dtim_period; 1310 else 1311 bss_conf->dtim_period = 0; 1312 1313 bss_conf->assoc = 1; 1314 1315 /* Tell the driver to monitor connection quality (if supported) */ 1316 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1317 bss_conf->cqm_rssi_thold) 1318 bss_info_changed |= BSS_CHANGED_CQM; 1319 1320 /* Enable ARP filtering */ 1321 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { 1322 bss_conf->arp_filter_enabled = sdata->arp_filter_state; 1323 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1324 } 1325 1326 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1327 1328 mutex_lock(&local->iflist_mtx); 1329 ieee80211_recalc_ps(local, -1); 1330 ieee80211_recalc_smps(local); 1331 mutex_unlock(&local->iflist_mtx); 1332 1333 netif_tx_start_all_queues(sdata->dev); 1334 netif_carrier_on(sdata->dev); 1335 } 1336 1337 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1338 u16 stype, u16 reason, bool tx, 1339 u8 *frame_buf) 1340 { 1341 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1342 struct ieee80211_local *local = sdata->local; 1343 struct sta_info *sta; 1344 u32 changed = 0; 1345 1346 ASSERT_MGD_MTX(ifmgd); 1347 1348 if (WARN_ON_ONCE(tx && !frame_buf)) 1349 return; 1350 1351 if (WARN_ON(!ifmgd->associated)) 1352 return; 1353 1354 ieee80211_stop_poll(sdata); 1355 1356 ifmgd->associated = NULL; 1357 1358 /* 1359 * we need to commit the associated = NULL change because the 1360 * scan code uses that to determine whether this iface should 1361 * go to/wake up from powersave or not -- and could otherwise 1362 * wake the queues erroneously. 1363 */ 1364 smp_mb(); 1365 1366 /* 1367 * Thus, we can only afterwards stop the queues -- to account 1368 * for the case where another CPU is finishing a scan at this 1369 * time -- we don't want the scan code to enable queues. 1370 */ 1371 1372 netif_tx_stop_all_queues(sdata->dev); 1373 netif_carrier_off(sdata->dev); 1374 1375 mutex_lock(&local->sta_mtx); 1376 sta = sta_info_get(sdata, ifmgd->bssid); 1377 if (sta) { 1378 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 1379 ieee80211_sta_tear_down_BA_sessions(sta, tx); 1380 } 1381 mutex_unlock(&local->sta_mtx); 1382 1383 /* deauthenticate/disassociate now */ 1384 if (tx || frame_buf) 1385 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 1386 reason, tx, frame_buf); 1387 1388 /* flush out frame */ 1389 if (tx) 1390 drv_flush(local, false); 1391 1392 /* clear bssid only after building the needed mgmt frames */ 1393 memset(ifmgd->bssid, 0, ETH_ALEN); 1394 1395 /* remove AP and TDLS peers */ 1396 sta_info_flush(local, sdata); 1397 1398 /* finally reset all BSS / config parameters */ 1399 changed |= ieee80211_reset_erp_info(sdata); 1400 1401 ieee80211_led_assoc(local, 0); 1402 changed |= BSS_CHANGED_ASSOC; 1403 sdata->vif.bss_conf.assoc = false; 1404 1405 /* on the next assoc, re-program HT parameters */ 1406 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 1407 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 1408 1409 local->power_constr_level = 0; 1410 1411 del_timer_sync(&local->dynamic_ps_timer); 1412 cancel_work_sync(&local->dynamic_ps_enable_work); 1413 1414 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1415 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1416 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1417 } 1418 local->ps_sdata = NULL; 1419 1420 /* Disable ARP filtering */ 1421 if (sdata->vif.bss_conf.arp_filter_enabled) { 1422 sdata->vif.bss_conf.arp_filter_enabled = false; 1423 changed |= BSS_CHANGED_ARP_FILTER; 1424 } 1425 1426 sdata->vif.bss_conf.qos = false; 1427 changed |= BSS_CHANGED_QOS; 1428 1429 /* The BSSID (not really interesting) and HT changed */ 1430 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1431 ieee80211_bss_info_change_notify(sdata, changed); 1432 1433 /* channel(_type) changes are handled by ieee80211_hw_config */ 1434 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); 1435 ieee80211_hw_config(local, 0); 1436 1437 /* disassociated - set to defaults now */ 1438 ieee80211_set_wmm_default(sdata, false); 1439 1440 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1441 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1442 del_timer_sync(&sdata->u.mgd.timer); 1443 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1444 } 1445 1446 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1447 struct ieee80211_hdr *hdr) 1448 { 1449 /* 1450 * We can postpone the mgd.timer whenever receiving unicast frames 1451 * from AP because we know that the connection is working both ways 1452 * at that time. But multicast frames (and hence also beacons) must 1453 * be ignored here, because we need to trigger the timer during 1454 * data idle periods for sending the periodic probe request to the 1455 * AP we're connected to. 1456 */ 1457 if (is_multicast_ether_addr(hdr->addr1)) 1458 return; 1459 1460 ieee80211_sta_reset_conn_monitor(sdata); 1461 } 1462 1463 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1464 { 1465 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1466 struct ieee80211_local *local = sdata->local; 1467 1468 mutex_lock(&local->mtx); 1469 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1470 IEEE80211_STA_CONNECTION_POLL))) { 1471 mutex_unlock(&local->mtx); 1472 return; 1473 } 1474 1475 __ieee80211_stop_poll(sdata); 1476 1477 mutex_lock(&local->iflist_mtx); 1478 ieee80211_recalc_ps(local, -1); 1479 mutex_unlock(&local->iflist_mtx); 1480 1481 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1482 goto out; 1483 1484 /* 1485 * We've received a probe response, but are not sure whether 1486 * we have or will be receiving any beacons or data, so let's 1487 * schedule the timers again, just in case. 1488 */ 1489 ieee80211_sta_reset_beacon_monitor(sdata); 1490 1491 mod_timer(&ifmgd->conn_mon_timer, 1492 round_jiffies_up(jiffies + 1493 IEEE80211_CONNECTION_IDLE_TIME)); 1494 out: 1495 mutex_unlock(&local->mtx); 1496 } 1497 1498 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1499 struct ieee80211_hdr *hdr, bool ack) 1500 { 1501 if (!ieee80211_is_data(hdr->frame_control)) 1502 return; 1503 1504 if (ack) 1505 ieee80211_sta_reset_conn_monitor(sdata); 1506 1507 if (ieee80211_is_nullfunc(hdr->frame_control) && 1508 sdata->u.mgd.probe_send_count > 0) { 1509 if (ack) 1510 sdata->u.mgd.probe_send_count = 0; 1511 else 1512 sdata->u.mgd.nullfunc_failed = true; 1513 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1514 } 1515 } 1516 1517 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1518 { 1519 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1520 const u8 *ssid; 1521 u8 *dst = ifmgd->associated->bssid; 1522 u8 unicast_limit = max(1, max_probe_tries - 3); 1523 1524 /* 1525 * Try sending broadcast probe requests for the last three 1526 * probe requests after the first ones failed since some 1527 * buggy APs only support broadcast probe requests. 1528 */ 1529 if (ifmgd->probe_send_count >= unicast_limit) 1530 dst = NULL; 1531 1532 /* 1533 * When the hardware reports an accurate Tx ACK status, it's 1534 * better to send a nullfunc frame instead of a probe request, 1535 * as it will kick us off the AP quickly if we aren't associated 1536 * anymore. The timeout will be reset if the frame is ACKed by 1537 * the AP. 1538 */ 1539 ifmgd->probe_send_count++; 1540 1541 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1542 ifmgd->nullfunc_failed = false; 1543 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1544 } else { 1545 int ssid_len; 1546 1547 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1548 if (WARN_ON_ONCE(ssid == NULL)) 1549 ssid_len = 0; 1550 else 1551 ssid_len = ssid[1]; 1552 1553 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL, 1554 0, (u32) -1, true, false); 1555 } 1556 1557 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1558 run_again(ifmgd, ifmgd->probe_timeout); 1559 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1560 drv_flush(sdata->local, false); 1561 } 1562 1563 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1564 bool beacon) 1565 { 1566 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1567 bool already = false; 1568 1569 if (!ieee80211_sdata_running(sdata)) 1570 return; 1571 1572 mutex_lock(&ifmgd->mtx); 1573 1574 if (!ifmgd->associated) 1575 goto out; 1576 1577 mutex_lock(&sdata->local->mtx); 1578 1579 if (sdata->local->tmp_channel || sdata->local->scanning) { 1580 mutex_unlock(&sdata->local->mtx); 1581 goto out; 1582 } 1583 1584 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1585 if (beacon) 1586 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n", 1587 sdata->name); 1588 #endif 1589 1590 /* 1591 * The driver/our work has already reported this event or the 1592 * connection monitoring has kicked in and we have already sent 1593 * a probe request. Or maybe the AP died and the driver keeps 1594 * reporting until we disassociate... 1595 * 1596 * In either case we have to ignore the current call to this 1597 * function (except for setting the correct probe reason bit) 1598 * because otherwise we would reset the timer every time and 1599 * never check whether we received a probe response! 1600 */ 1601 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1602 IEEE80211_STA_CONNECTION_POLL)) 1603 already = true; 1604 1605 if (beacon) 1606 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 1607 else 1608 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1609 1610 mutex_unlock(&sdata->local->mtx); 1611 1612 if (already) 1613 goto out; 1614 1615 mutex_lock(&sdata->local->iflist_mtx); 1616 ieee80211_recalc_ps(sdata->local, -1); 1617 mutex_unlock(&sdata->local->iflist_mtx); 1618 1619 ifmgd->probe_send_count = 0; 1620 ieee80211_mgd_probe_ap_send(sdata); 1621 out: 1622 mutex_unlock(&ifmgd->mtx); 1623 } 1624 1625 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1626 struct ieee80211_vif *vif) 1627 { 1628 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1629 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1630 struct sk_buff *skb; 1631 const u8 *ssid; 1632 int ssid_len; 1633 1634 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1635 return NULL; 1636 1637 ASSERT_MGD_MTX(ifmgd); 1638 1639 if (!ifmgd->associated) 1640 return NULL; 1641 1642 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1643 if (WARN_ON_ONCE(ssid == NULL)) 1644 ssid_len = 0; 1645 else 1646 ssid_len = ssid[1]; 1647 1648 skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid, 1649 (u32) -1, ssid + 2, ssid_len, 1650 NULL, 0, true); 1651 1652 return skb; 1653 } 1654 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1655 1656 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) 1657 { 1658 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1659 struct ieee80211_local *local = sdata->local; 1660 u8 bssid[ETH_ALEN]; 1661 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 1662 1663 mutex_lock(&ifmgd->mtx); 1664 if (!ifmgd->associated) { 1665 mutex_unlock(&ifmgd->mtx); 1666 return; 1667 } 1668 1669 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 1670 1671 printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n", 1672 sdata->name, bssid); 1673 1674 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 1675 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1676 false, frame_buf); 1677 mutex_unlock(&ifmgd->mtx); 1678 1679 /* 1680 * must be outside lock due to cfg80211, 1681 * but that's not a problem. 1682 */ 1683 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 1684 1685 mutex_lock(&local->mtx); 1686 ieee80211_recalc_idle(local); 1687 mutex_unlock(&local->mtx); 1688 } 1689 1690 void ieee80211_beacon_connection_loss_work(struct work_struct *work) 1691 { 1692 struct ieee80211_sub_if_data *sdata = 1693 container_of(work, struct ieee80211_sub_if_data, 1694 u.mgd.beacon_connection_loss_work); 1695 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1696 struct sta_info *sta; 1697 1698 if (ifmgd->associated) { 1699 rcu_read_lock(); 1700 sta = sta_info_get(sdata, ifmgd->bssid); 1701 if (sta) 1702 sta->beacon_loss_count++; 1703 rcu_read_unlock(); 1704 } 1705 1706 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1707 __ieee80211_connection_loss(sdata); 1708 else 1709 ieee80211_mgd_probe_ap(sdata, true); 1710 } 1711 1712 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 1713 { 1714 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1715 struct ieee80211_hw *hw = &sdata->local->hw; 1716 1717 trace_api_beacon_loss(sdata); 1718 1719 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 1720 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1721 } 1722 EXPORT_SYMBOL(ieee80211_beacon_loss); 1723 1724 void ieee80211_connection_loss(struct ieee80211_vif *vif) 1725 { 1726 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1727 struct ieee80211_hw *hw = &sdata->local->hw; 1728 1729 trace_api_connection_loss(sdata); 1730 1731 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); 1732 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 1733 } 1734 EXPORT_SYMBOL(ieee80211_connection_loss); 1735 1736 1737 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 1738 bool assoc) 1739 { 1740 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 1741 1742 lockdep_assert_held(&sdata->u.mgd.mtx); 1743 1744 if (!assoc) { 1745 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 1746 1747 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 1748 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 1749 } 1750 1751 cfg80211_put_bss(auth_data->bss); 1752 kfree(auth_data); 1753 sdata->u.mgd.auth_data = NULL; 1754 } 1755 1756 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 1757 struct ieee80211_mgmt *mgmt, size_t len) 1758 { 1759 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 1760 u8 *pos; 1761 struct ieee802_11_elems elems; 1762 1763 pos = mgmt->u.auth.variable; 1764 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1765 if (!elems.challenge) 1766 return; 1767 auth_data->expected_transaction = 4; 1768 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 1769 elems.challenge - 2, elems.challenge_len + 2, 1770 auth_data->bss->bssid, auth_data->bss->bssid, 1771 auth_data->key, auth_data->key_len, 1772 auth_data->key_idx); 1773 } 1774 1775 static enum rx_mgmt_action __must_check 1776 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 1777 struct ieee80211_mgmt *mgmt, size_t len) 1778 { 1779 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1780 u8 bssid[ETH_ALEN]; 1781 u16 auth_alg, auth_transaction, status_code; 1782 struct sta_info *sta; 1783 1784 lockdep_assert_held(&ifmgd->mtx); 1785 1786 if (len < 24 + 6) 1787 return RX_MGMT_NONE; 1788 1789 if (!ifmgd->auth_data || ifmgd->auth_data->done) 1790 return RX_MGMT_NONE; 1791 1792 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 1793 1794 if (!ether_addr_equal(bssid, mgmt->bssid)) 1795 return RX_MGMT_NONE; 1796 1797 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 1798 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 1799 status_code = le16_to_cpu(mgmt->u.auth.status_code); 1800 1801 if (auth_alg != ifmgd->auth_data->algorithm || 1802 auth_transaction != ifmgd->auth_data->expected_transaction) 1803 return RX_MGMT_NONE; 1804 1805 if (status_code != WLAN_STATUS_SUCCESS) { 1806 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n", 1807 sdata->name, mgmt->sa, status_code); 1808 goto out; 1809 } 1810 1811 switch (ifmgd->auth_data->algorithm) { 1812 case WLAN_AUTH_OPEN: 1813 case WLAN_AUTH_LEAP: 1814 case WLAN_AUTH_FT: 1815 break; 1816 case WLAN_AUTH_SHARED_KEY: 1817 if (ifmgd->auth_data->expected_transaction != 4) { 1818 ieee80211_auth_challenge(sdata, mgmt, len); 1819 /* need another frame */ 1820 return RX_MGMT_NONE; 1821 } 1822 break; 1823 default: 1824 WARN_ONCE(1, "invalid auth alg %d", 1825 ifmgd->auth_data->algorithm); 1826 return RX_MGMT_NONE; 1827 } 1828 1829 printk(KERN_DEBUG "%s: authenticated\n", sdata->name); 1830 out: 1831 ifmgd->auth_data->done = true; 1832 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 1833 run_again(ifmgd, ifmgd->auth_data->timeout); 1834 1835 /* move station state to auth */ 1836 mutex_lock(&sdata->local->sta_mtx); 1837 sta = sta_info_get(sdata, bssid); 1838 if (!sta) { 1839 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 1840 goto out_err; 1841 } 1842 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 1843 printk(KERN_DEBUG "%s: failed moving %pM to auth\n", 1844 sdata->name, bssid); 1845 goto out_err; 1846 } 1847 mutex_unlock(&sdata->local->sta_mtx); 1848 1849 return RX_MGMT_CFG80211_RX_AUTH; 1850 out_err: 1851 mutex_unlock(&sdata->local->sta_mtx); 1852 /* ignore frame -- wait for timeout */ 1853 return RX_MGMT_NONE; 1854 } 1855 1856 1857 static enum rx_mgmt_action __must_check 1858 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1859 struct ieee80211_mgmt *mgmt, size_t len) 1860 { 1861 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1862 const u8 *bssid = NULL; 1863 u16 reason_code; 1864 1865 lockdep_assert_held(&ifmgd->mtx); 1866 1867 if (len < 24 + 2) 1868 return RX_MGMT_NONE; 1869 1870 if (!ifmgd->associated || 1871 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 1872 return RX_MGMT_NONE; 1873 1874 bssid = ifmgd->associated->bssid; 1875 1876 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1877 1878 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n", 1879 sdata->name, bssid, reason_code); 1880 1881 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 1882 1883 mutex_lock(&sdata->local->mtx); 1884 ieee80211_recalc_idle(sdata->local); 1885 mutex_unlock(&sdata->local->mtx); 1886 1887 return RX_MGMT_CFG80211_DEAUTH; 1888 } 1889 1890 1891 static enum rx_mgmt_action __must_check 1892 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1893 struct ieee80211_mgmt *mgmt, size_t len) 1894 { 1895 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1896 u16 reason_code; 1897 1898 lockdep_assert_held(&ifmgd->mtx); 1899 1900 if (len < 24 + 2) 1901 return RX_MGMT_NONE; 1902 1903 if (!ifmgd->associated || 1904 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 1905 return RX_MGMT_NONE; 1906 1907 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1908 1909 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n", 1910 sdata->name, mgmt->sa, reason_code); 1911 1912 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 1913 1914 mutex_lock(&sdata->local->mtx); 1915 ieee80211_recalc_idle(sdata->local); 1916 mutex_unlock(&sdata->local->mtx); 1917 1918 return RX_MGMT_CFG80211_DISASSOC; 1919 } 1920 1921 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 1922 u8 *supp_rates, unsigned int supp_rates_len, 1923 u32 *rates, u32 *basic_rates, 1924 bool *have_higher_than_11mbit, 1925 int *min_rate, int *min_rate_index) 1926 { 1927 int i, j; 1928 1929 for (i = 0; i < supp_rates_len; i++) { 1930 int rate = (supp_rates[i] & 0x7f) * 5; 1931 bool is_basic = !!(supp_rates[i] & 0x80); 1932 1933 if (rate > 110) 1934 *have_higher_than_11mbit = true; 1935 1936 /* 1937 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 1938 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 1939 * 1940 * Note: Even through the membership selector and the basic 1941 * rate flag share the same bit, they are not exactly 1942 * the same. 1943 */ 1944 if (!!(supp_rates[i] & 0x80) && 1945 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 1946 continue; 1947 1948 for (j = 0; j < sband->n_bitrates; j++) { 1949 if (sband->bitrates[j].bitrate == rate) { 1950 *rates |= BIT(j); 1951 if (is_basic) 1952 *basic_rates |= BIT(j); 1953 if (rate < *min_rate) { 1954 *min_rate = rate; 1955 *min_rate_index = j; 1956 } 1957 break; 1958 } 1959 } 1960 } 1961 } 1962 1963 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 1964 bool assoc) 1965 { 1966 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 1967 1968 lockdep_assert_held(&sdata->u.mgd.mtx); 1969 1970 if (!assoc) { 1971 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 1972 1973 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 1974 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 1975 } 1976 1977 kfree(assoc_data); 1978 sdata->u.mgd.assoc_data = NULL; 1979 } 1980 1981 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 1982 struct cfg80211_bss *cbss, 1983 struct ieee80211_mgmt *mgmt, size_t len) 1984 { 1985 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1986 struct ieee80211_local *local = sdata->local; 1987 struct ieee80211_supported_band *sband; 1988 struct sta_info *sta; 1989 u8 *pos; 1990 u16 capab_info, aid; 1991 struct ieee802_11_elems elems; 1992 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1993 u32 changed = 0; 1994 int err; 1995 1996 /* AssocResp and ReassocResp have identical structure */ 1997 1998 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1999 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2000 2001 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2002 printk(KERN_DEBUG 2003 "%s: invalid AID value 0x%x; bits 15:14 not set\n", 2004 sdata->name, aid); 2005 aid &= ~(BIT(15) | BIT(14)); 2006 2007 ifmgd->broken_ap = false; 2008 2009 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2010 printk(KERN_DEBUG 2011 "%s: invalid AID value %d (out of range), turn off PS\n", 2012 sdata->name, aid); 2013 aid = 0; 2014 ifmgd->broken_ap = true; 2015 } 2016 2017 pos = mgmt->u.assoc_resp.variable; 2018 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2019 2020 if (!elems.supp_rates) { 2021 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 2022 sdata->name); 2023 return false; 2024 } 2025 2026 ifmgd->aid = aid; 2027 2028 mutex_lock(&sdata->local->sta_mtx); 2029 /* 2030 * station info was already allocated and inserted before 2031 * the association and should be available to us 2032 */ 2033 sta = sta_info_get(sdata, cbss->bssid); 2034 if (WARN_ON(!sta)) { 2035 mutex_unlock(&sdata->local->sta_mtx); 2036 return false; 2037 } 2038 2039 sband = local->hw.wiphy->bands[local->oper_channel->band]; 2040 2041 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 2042 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2043 elems.ht_cap_elem, &sta->sta.ht_cap); 2044 2045 sta->supports_40mhz = 2046 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40; 2047 2048 rate_control_rate_init(sta); 2049 2050 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 2051 set_sta_flag(sta, WLAN_STA_MFP); 2052 2053 if (elems.wmm_param) 2054 set_sta_flag(sta, WLAN_STA_WME); 2055 2056 err = sta_info_move_state(sta, IEEE80211_STA_AUTH); 2057 if (!err) 2058 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 2059 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 2060 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 2061 if (err) { 2062 printk(KERN_DEBUG 2063 "%s: failed to move station %pM to desired state\n", 2064 sdata->name, sta->sta.addr); 2065 WARN_ON(__sta_info_destroy(sta)); 2066 mutex_unlock(&sdata->local->sta_mtx); 2067 return false; 2068 } 2069 2070 mutex_unlock(&sdata->local->sta_mtx); 2071 2072 /* 2073 * Always handle WMM once after association regardless 2074 * of the first value the AP uses. Setting -1 here has 2075 * that effect because the AP values is an unsigned 2076 * 4-bit value. 2077 */ 2078 ifmgd->wmm_last_param_set = -1; 2079 2080 if (elems.wmm_param) 2081 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2082 elems.wmm_param_len); 2083 else 2084 ieee80211_set_wmm_default(sdata, false); 2085 changed |= BSS_CHANGED_QOS; 2086 2087 if (elems.ht_operation && elems.wmm_param && 2088 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) 2089 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, 2090 cbss->bssid, false); 2091 2092 /* set AID and assoc capability, 2093 * ieee80211_set_associated() will tell the driver */ 2094 bss_conf->aid = aid; 2095 bss_conf->assoc_capability = capab_info; 2096 ieee80211_set_associated(sdata, cbss, changed); 2097 2098 /* 2099 * If we're using 4-addr mode, let the AP know that we're 2100 * doing so, so that it can create the STA VLAN on its side 2101 */ 2102 if (ifmgd->use_4addr) 2103 ieee80211_send_4addr_nullfunc(local, sdata); 2104 2105 /* 2106 * Start timer to probe the connection to the AP now. 2107 * Also start the timer that will detect beacon loss. 2108 */ 2109 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 2110 ieee80211_sta_reset_beacon_monitor(sdata); 2111 2112 return true; 2113 } 2114 2115 static enum rx_mgmt_action __must_check 2116 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 2117 struct ieee80211_mgmt *mgmt, size_t len, 2118 struct cfg80211_bss **bss) 2119 { 2120 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2121 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2122 u16 capab_info, status_code, aid; 2123 struct ieee802_11_elems elems; 2124 u8 *pos; 2125 bool reassoc; 2126 2127 lockdep_assert_held(&ifmgd->mtx); 2128 2129 if (!assoc_data) 2130 return RX_MGMT_NONE; 2131 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 2132 return RX_MGMT_NONE; 2133 2134 /* 2135 * AssocResp and ReassocResp have identical structure, so process both 2136 * of them in this function. 2137 */ 2138 2139 if (len < 24 + 6) 2140 return RX_MGMT_NONE; 2141 2142 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 2143 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2144 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2145 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2146 2147 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x " 2148 "status=%d aid=%d)\n", 2149 sdata->name, reassoc ? "Rea" : "A", mgmt->sa, 2150 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 2151 2152 pos = mgmt->u.assoc_resp.variable; 2153 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2154 2155 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 2156 elems.timeout_int && elems.timeout_int_len == 5 && 2157 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) { 2158 u32 tu, ms; 2159 tu = get_unaligned_le32(elems.timeout_int + 1); 2160 ms = tu * 1024 / 1000; 2161 printk(KERN_DEBUG "%s: %pM rejected association temporarily; " 2162 "comeback duration %u TU (%u ms)\n", 2163 sdata->name, mgmt->sa, tu, ms); 2164 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 2165 if (ms > IEEE80211_ASSOC_TIMEOUT) 2166 run_again(ifmgd, assoc_data->timeout); 2167 return RX_MGMT_NONE; 2168 } 2169 2170 *bss = assoc_data->bss; 2171 2172 if (status_code != WLAN_STATUS_SUCCESS) { 2173 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n", 2174 sdata->name, mgmt->sa, status_code); 2175 ieee80211_destroy_assoc_data(sdata, false); 2176 } else { 2177 printk(KERN_DEBUG "%s: associated\n", sdata->name); 2178 2179 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) { 2180 /* oops -- internal error -- send timeout for now */ 2181 ieee80211_destroy_assoc_data(sdata, true); 2182 sta_info_destroy_addr(sdata, mgmt->bssid); 2183 cfg80211_put_bss(*bss); 2184 return RX_MGMT_CFG80211_ASSOC_TIMEOUT; 2185 } 2186 2187 /* 2188 * destroy assoc_data afterwards, as otherwise an idle 2189 * recalc after assoc_data is NULL but before associated 2190 * is set can cause the interface to go idle 2191 */ 2192 ieee80211_destroy_assoc_data(sdata, true); 2193 } 2194 2195 return RX_MGMT_CFG80211_RX_ASSOC; 2196 } 2197 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 2198 struct ieee80211_mgmt *mgmt, 2199 size_t len, 2200 struct ieee80211_rx_status *rx_status, 2201 struct ieee802_11_elems *elems, 2202 bool beacon) 2203 { 2204 struct ieee80211_local *local = sdata->local; 2205 int freq; 2206 struct ieee80211_bss *bss; 2207 struct ieee80211_channel *channel; 2208 bool need_ps = false; 2209 2210 if (sdata->u.mgd.associated && 2211 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) { 2212 bss = (void *)sdata->u.mgd.associated->priv; 2213 /* not previously set so we may need to recalc */ 2214 need_ps = !bss->dtim_period; 2215 } 2216 2217 if (elems->ds_params && elems->ds_params_len == 1) 2218 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 2219 rx_status->band); 2220 else 2221 freq = rx_status->freq; 2222 2223 channel = ieee80211_get_channel(local->hw.wiphy, freq); 2224 2225 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 2226 return; 2227 2228 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 2229 channel, beacon); 2230 if (bss) 2231 ieee80211_rx_bss_put(local, bss); 2232 2233 if (!sdata->u.mgd.associated) 2234 return; 2235 2236 if (need_ps) { 2237 mutex_lock(&local->iflist_mtx); 2238 ieee80211_recalc_ps(local, -1); 2239 mutex_unlock(&local->iflist_mtx); 2240 } 2241 2242 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && 2243 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, 2244 ETH_ALEN) == 0)) { 2245 struct ieee80211_channel_sw_ie *sw_elem = 2246 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; 2247 ieee80211_sta_process_chanswitch(sdata, sw_elem, 2248 bss, rx_status->mactime); 2249 } 2250 } 2251 2252 2253 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 2254 struct sk_buff *skb) 2255 { 2256 struct ieee80211_mgmt *mgmt = (void *)skb->data; 2257 struct ieee80211_if_managed *ifmgd; 2258 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 2259 size_t baselen, len = skb->len; 2260 struct ieee802_11_elems elems; 2261 2262 ifmgd = &sdata->u.mgd; 2263 2264 ASSERT_MGD_MTX(ifmgd); 2265 2266 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 2267 return; /* ignore ProbeResp to foreign address */ 2268 2269 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 2270 if (baselen > len) 2271 return; 2272 2273 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 2274 &elems); 2275 2276 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 2277 2278 if (ifmgd->associated && 2279 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2280 ieee80211_reset_ap_probe(sdata); 2281 2282 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && 2283 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { 2284 /* got probe response, continue with auth */ 2285 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name); 2286 ifmgd->auth_data->tries = 0; 2287 ifmgd->auth_data->timeout = jiffies; 2288 run_again(ifmgd, ifmgd->auth_data->timeout); 2289 } 2290 } 2291 2292 /* 2293 * This is the canonical list of information elements we care about, 2294 * the filter code also gives us all changes to the Microsoft OUI 2295 * (00:50:F2) vendor IE which is used for WMM which we need to track. 2296 * 2297 * We implement beacon filtering in software since that means we can 2298 * avoid processing the frame here and in cfg80211, and userspace 2299 * will not be able to tell whether the hardware supports it or not. 2300 * 2301 * XXX: This list needs to be dynamic -- userspace needs to be able to 2302 * add items it requires. It also needs to be able to tell us to 2303 * look out for other vendor IEs. 2304 */ 2305 static const u64 care_about_ies = 2306 (1ULL << WLAN_EID_COUNTRY) | 2307 (1ULL << WLAN_EID_ERP_INFO) | 2308 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 2309 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 2310 (1ULL << WLAN_EID_HT_CAPABILITY) | 2311 (1ULL << WLAN_EID_HT_OPERATION); 2312 2313 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 2314 struct ieee80211_mgmt *mgmt, 2315 size_t len, 2316 struct ieee80211_rx_status *rx_status) 2317 { 2318 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2319 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2320 size_t baselen; 2321 struct ieee802_11_elems elems; 2322 struct ieee80211_local *local = sdata->local; 2323 u32 changed = 0; 2324 bool erp_valid, directed_tim = false; 2325 u8 erp_value = 0; 2326 u32 ncrc; 2327 u8 *bssid; 2328 2329 lockdep_assert_held(&ifmgd->mtx); 2330 2331 /* Process beacon from the current BSS */ 2332 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 2333 if (baselen > len) 2334 return; 2335 2336 if (rx_status->freq != local->hw.conf.channel->center_freq) 2337 return; 2338 2339 if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon && 2340 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2341 ieee802_11_parse_elems(mgmt->u.beacon.variable, 2342 len - baselen, &elems); 2343 2344 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 2345 false); 2346 ifmgd->assoc_data->have_beacon = true; 2347 ifmgd->assoc_data->sent_assoc = false; 2348 /* continue assoc process */ 2349 ifmgd->assoc_data->timeout = jiffies; 2350 run_again(ifmgd, ifmgd->assoc_data->timeout); 2351 return; 2352 } 2353 2354 if (!ifmgd->associated || 2355 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2356 return; 2357 bssid = ifmgd->associated->bssid; 2358 2359 /* Track average RSSI from the Beacon frames of the current AP */ 2360 ifmgd->last_beacon_signal = rx_status->signal; 2361 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 2362 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 2363 ifmgd->ave_beacon_signal = rx_status->signal * 16; 2364 ifmgd->last_cqm_event_signal = 0; 2365 ifmgd->count_beacon_signal = 1; 2366 ifmgd->last_ave_beacon_signal = 0; 2367 } else { 2368 ifmgd->ave_beacon_signal = 2369 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 2370 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 2371 ifmgd->ave_beacon_signal) / 16; 2372 ifmgd->count_beacon_signal++; 2373 } 2374 2375 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 2376 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 2377 int sig = ifmgd->ave_beacon_signal; 2378 int last_sig = ifmgd->last_ave_beacon_signal; 2379 2380 /* 2381 * if signal crosses either of the boundaries, invoke callback 2382 * with appropriate parameters 2383 */ 2384 if (sig > ifmgd->rssi_max_thold && 2385 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 2386 ifmgd->last_ave_beacon_signal = sig; 2387 drv_rssi_callback(local, RSSI_EVENT_HIGH); 2388 } else if (sig < ifmgd->rssi_min_thold && 2389 (last_sig >= ifmgd->rssi_max_thold || 2390 last_sig == 0)) { 2391 ifmgd->last_ave_beacon_signal = sig; 2392 drv_rssi_callback(local, RSSI_EVENT_LOW); 2393 } 2394 } 2395 2396 if (bss_conf->cqm_rssi_thold && 2397 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 2398 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 2399 int sig = ifmgd->ave_beacon_signal / 16; 2400 int last_event = ifmgd->last_cqm_event_signal; 2401 int thold = bss_conf->cqm_rssi_thold; 2402 int hyst = bss_conf->cqm_rssi_hyst; 2403 if (sig < thold && 2404 (last_event == 0 || sig < last_event - hyst)) { 2405 ifmgd->last_cqm_event_signal = sig; 2406 ieee80211_cqm_rssi_notify( 2407 &sdata->vif, 2408 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 2409 GFP_KERNEL); 2410 } else if (sig > thold && 2411 (last_event == 0 || sig > last_event + hyst)) { 2412 ifmgd->last_cqm_event_signal = sig; 2413 ieee80211_cqm_rssi_notify( 2414 &sdata->vif, 2415 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 2416 GFP_KERNEL); 2417 } 2418 } 2419 2420 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 2421 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2422 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n", 2423 sdata->name); 2424 #endif 2425 mutex_lock(&local->mtx); 2426 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 2427 ieee80211_run_deferred_scan(local); 2428 mutex_unlock(&local->mtx); 2429 2430 mutex_lock(&local->iflist_mtx); 2431 ieee80211_recalc_ps(local, -1); 2432 mutex_unlock(&local->iflist_mtx); 2433 } 2434 2435 /* 2436 * Push the beacon loss detection into the future since 2437 * we are processing a beacon from the AP just now. 2438 */ 2439 ieee80211_sta_reset_beacon_monitor(sdata); 2440 2441 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 2442 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 2443 len - baselen, &elems, 2444 care_about_ies, ncrc); 2445 2446 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 2447 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, 2448 ifmgd->aid); 2449 2450 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { 2451 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, 2452 true); 2453 2454 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2455 elems.wmm_param_len); 2456 } 2457 2458 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 2459 if (directed_tim) { 2460 if (local->hw.conf.dynamic_ps_timeout > 0) { 2461 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2462 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2463 ieee80211_hw_config(local, 2464 IEEE80211_CONF_CHANGE_PS); 2465 } 2466 ieee80211_send_nullfunc(local, sdata, 0); 2467 } else if (!local->pspolling && sdata->u.mgd.powersave) { 2468 local->pspolling = true; 2469 2470 /* 2471 * Here is assumed that the driver will be 2472 * able to send ps-poll frame and receive a 2473 * response even though power save mode is 2474 * enabled, but some drivers might require 2475 * to disable power save here. This needs 2476 * to be investigated. 2477 */ 2478 ieee80211_send_pspoll(local, sdata); 2479 } 2480 } 2481 } 2482 2483 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 2484 return; 2485 ifmgd->beacon_crc = ncrc; 2486 ifmgd->beacon_crc_valid = true; 2487 2488 if (elems.erp_info && elems.erp_info_len >= 1) { 2489 erp_valid = true; 2490 erp_value = elems.erp_info[0]; 2491 } else { 2492 erp_valid = false; 2493 } 2494 changed |= ieee80211_handle_bss_capability(sdata, 2495 le16_to_cpu(mgmt->u.beacon.capab_info), 2496 erp_valid, erp_value); 2497 2498 2499 if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param && 2500 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { 2501 struct ieee80211_supported_band *sband; 2502 2503 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 2504 2505 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, 2506 bssid, true); 2507 } 2508 2509 /* Note: country IE parsing is done for us by cfg80211 */ 2510 if (elems.country_elem) { 2511 /* TODO: IBSS also needs this */ 2512 if (elems.pwr_constr_elem) 2513 ieee80211_handle_pwr_constr(sdata, 2514 le16_to_cpu(mgmt->u.probe_resp.capab_info), 2515 elems.pwr_constr_elem, 2516 elems.pwr_constr_elem_len); 2517 } 2518 2519 ieee80211_bss_info_change_notify(sdata, changed); 2520 } 2521 2522 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 2523 struct sk_buff *skb) 2524 { 2525 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2526 struct ieee80211_rx_status *rx_status; 2527 struct ieee80211_mgmt *mgmt; 2528 struct cfg80211_bss *bss = NULL; 2529 enum rx_mgmt_action rma = RX_MGMT_NONE; 2530 u16 fc; 2531 2532 rx_status = (struct ieee80211_rx_status *) skb->cb; 2533 mgmt = (struct ieee80211_mgmt *) skb->data; 2534 fc = le16_to_cpu(mgmt->frame_control); 2535 2536 mutex_lock(&ifmgd->mtx); 2537 2538 switch (fc & IEEE80211_FCTL_STYPE) { 2539 case IEEE80211_STYPE_BEACON: 2540 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 2541 break; 2542 case IEEE80211_STYPE_PROBE_RESP: 2543 ieee80211_rx_mgmt_probe_resp(sdata, skb); 2544 break; 2545 case IEEE80211_STYPE_AUTH: 2546 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 2547 break; 2548 case IEEE80211_STYPE_DEAUTH: 2549 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 2550 break; 2551 case IEEE80211_STYPE_DISASSOC: 2552 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 2553 break; 2554 case IEEE80211_STYPE_ASSOC_RESP: 2555 case IEEE80211_STYPE_REASSOC_RESP: 2556 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss); 2557 break; 2558 case IEEE80211_STYPE_ACTION: 2559 switch (mgmt->u.action.category) { 2560 case WLAN_CATEGORY_SPECTRUM_MGMT: 2561 ieee80211_sta_process_chanswitch(sdata, 2562 &mgmt->u.action.u.chan_switch.sw_elem, 2563 (void *)ifmgd->associated->priv, 2564 rx_status->mactime); 2565 break; 2566 } 2567 } 2568 mutex_unlock(&ifmgd->mtx); 2569 2570 switch (rma) { 2571 case RX_MGMT_NONE: 2572 /* no action */ 2573 break; 2574 case RX_MGMT_CFG80211_DEAUTH: 2575 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 2576 break; 2577 case RX_MGMT_CFG80211_DISASSOC: 2578 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 2579 break; 2580 case RX_MGMT_CFG80211_RX_AUTH: 2581 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len); 2582 break; 2583 case RX_MGMT_CFG80211_RX_ASSOC: 2584 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len); 2585 break; 2586 case RX_MGMT_CFG80211_ASSOC_TIMEOUT: 2587 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid); 2588 break; 2589 default: 2590 WARN(1, "unexpected: %d", rma); 2591 } 2592 } 2593 2594 static void ieee80211_sta_timer(unsigned long data) 2595 { 2596 struct ieee80211_sub_if_data *sdata = 2597 (struct ieee80211_sub_if_data *) data; 2598 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2599 struct ieee80211_local *local = sdata->local; 2600 2601 if (local->quiescing) { 2602 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2603 return; 2604 } 2605 2606 ieee80211_queue_work(&local->hw, &sdata->work); 2607 } 2608 2609 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 2610 u8 *bssid, u8 reason) 2611 { 2612 struct ieee80211_local *local = sdata->local; 2613 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2614 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 2615 2616 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 2617 false, frame_buf); 2618 mutex_unlock(&ifmgd->mtx); 2619 2620 /* 2621 * must be outside lock due to cfg80211, 2622 * but that's not a problem. 2623 */ 2624 cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 2625 2626 mutex_lock(&local->mtx); 2627 ieee80211_recalc_idle(local); 2628 mutex_unlock(&local->mtx); 2629 2630 mutex_lock(&ifmgd->mtx); 2631 } 2632 2633 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) 2634 { 2635 struct ieee80211_local *local = sdata->local; 2636 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2637 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 2638 2639 lockdep_assert_held(&ifmgd->mtx); 2640 2641 if (WARN_ON_ONCE(!auth_data)) 2642 return -EINVAL; 2643 2644 auth_data->tries++; 2645 2646 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 2647 printk(KERN_DEBUG "%s: authentication with %pM timed out\n", 2648 sdata->name, auth_data->bss->bssid); 2649 2650 /* 2651 * Most likely AP is not in the range so remove the 2652 * bss struct for that AP. 2653 */ 2654 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 2655 2656 return -ETIMEDOUT; 2657 } 2658 2659 if (auth_data->bss->proberesp_ies) { 2660 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n", 2661 sdata->name, auth_data->bss->bssid, auth_data->tries, 2662 IEEE80211_AUTH_MAX_TRIES); 2663 2664 auth_data->expected_transaction = 2; 2665 ieee80211_send_auth(sdata, 1, auth_data->algorithm, 2666 auth_data->ie, auth_data->ie_len, 2667 auth_data->bss->bssid, 2668 auth_data->bss->bssid, NULL, 0, 0); 2669 } else { 2670 const u8 *ssidie; 2671 2672 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n", 2673 sdata->name, auth_data->bss->bssid, auth_data->tries, 2674 IEEE80211_AUTH_MAX_TRIES); 2675 2676 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); 2677 if (!ssidie) 2678 return -EINVAL; 2679 /* 2680 * Direct probe is sent to broadcast address as some APs 2681 * will not answer to direct packet in unassociated state. 2682 */ 2683 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1], 2684 NULL, 0, (u32) -1, true, false); 2685 } 2686 2687 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 2688 run_again(ifmgd, auth_data->timeout); 2689 2690 return 0; 2691 } 2692 2693 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 2694 { 2695 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2696 struct ieee80211_local *local = sdata->local; 2697 2698 lockdep_assert_held(&sdata->u.mgd.mtx); 2699 2700 assoc_data->tries++; 2701 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 2702 printk(KERN_DEBUG "%s: association with %pM timed out\n", 2703 sdata->name, assoc_data->bss->bssid); 2704 2705 /* 2706 * Most likely AP is not in the range so remove the 2707 * bss struct for that AP. 2708 */ 2709 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 2710 2711 return -ETIMEDOUT; 2712 } 2713 2714 printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n", 2715 sdata->name, assoc_data->bss->bssid, assoc_data->tries, 2716 IEEE80211_ASSOC_MAX_TRIES); 2717 ieee80211_send_assoc(sdata); 2718 2719 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 2720 run_again(&sdata->u.mgd, assoc_data->timeout); 2721 2722 return 0; 2723 } 2724 2725 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 2726 { 2727 struct ieee80211_local *local = sdata->local; 2728 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2729 2730 mutex_lock(&ifmgd->mtx); 2731 2732 if (ifmgd->auth_data && 2733 time_after(jiffies, ifmgd->auth_data->timeout)) { 2734 if (ifmgd->auth_data->done) { 2735 /* 2736 * ok ... we waited for assoc but userspace didn't, 2737 * so let's just kill the auth data 2738 */ 2739 ieee80211_destroy_auth_data(sdata, false); 2740 } else if (ieee80211_probe_auth(sdata)) { 2741 u8 bssid[ETH_ALEN]; 2742 2743 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2744 2745 ieee80211_destroy_auth_data(sdata, false); 2746 2747 mutex_unlock(&ifmgd->mtx); 2748 cfg80211_send_auth_timeout(sdata->dev, bssid); 2749 mutex_lock(&ifmgd->mtx); 2750 } 2751 } else if (ifmgd->auth_data) 2752 run_again(ifmgd, ifmgd->auth_data->timeout); 2753 2754 if (ifmgd->assoc_data && 2755 time_after(jiffies, ifmgd->assoc_data->timeout)) { 2756 if (!ifmgd->assoc_data->have_beacon || 2757 ieee80211_do_assoc(sdata)) { 2758 u8 bssid[ETH_ALEN]; 2759 2760 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN); 2761 2762 ieee80211_destroy_assoc_data(sdata, false); 2763 2764 mutex_unlock(&ifmgd->mtx); 2765 cfg80211_send_assoc_timeout(sdata->dev, bssid); 2766 mutex_lock(&ifmgd->mtx); 2767 } 2768 } else if (ifmgd->assoc_data) 2769 run_again(ifmgd, ifmgd->assoc_data->timeout); 2770 2771 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 2772 IEEE80211_STA_CONNECTION_POLL) && 2773 ifmgd->associated) { 2774 u8 bssid[ETH_ALEN]; 2775 int max_tries; 2776 2777 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 2778 2779 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2780 max_tries = max_nullfunc_tries; 2781 else 2782 max_tries = max_probe_tries; 2783 2784 /* ACK received for nullfunc probing frame */ 2785 if (!ifmgd->probe_send_count) 2786 ieee80211_reset_ap_probe(sdata); 2787 else if (ifmgd->nullfunc_failed) { 2788 if (ifmgd->probe_send_count < max_tries) { 2789 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2790 wiphy_debug(local->hw.wiphy, 2791 "%s: No ack for nullfunc frame to" 2792 " AP %pM, try %d/%i\n", 2793 sdata->name, bssid, 2794 ifmgd->probe_send_count, max_tries); 2795 #endif 2796 ieee80211_mgd_probe_ap_send(sdata); 2797 } else { 2798 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2799 wiphy_debug(local->hw.wiphy, 2800 "%s: No ack for nullfunc frame to" 2801 " AP %pM, disconnecting.\n", 2802 sdata->name, bssid); 2803 #endif 2804 ieee80211_sta_connection_lost(sdata, bssid, 2805 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2806 } 2807 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 2808 run_again(ifmgd, ifmgd->probe_timeout); 2809 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2810 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2811 wiphy_debug(local->hw.wiphy, 2812 "%s: Failed to send nullfunc to AP %pM" 2813 " after %dms, disconnecting.\n", 2814 sdata->name, 2815 bssid, probe_wait_ms); 2816 #endif 2817 ieee80211_sta_connection_lost(sdata, bssid, 2818 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2819 } else if (ifmgd->probe_send_count < max_tries) { 2820 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2821 wiphy_debug(local->hw.wiphy, 2822 "%s: No probe response from AP %pM" 2823 " after %dms, try %d/%i\n", 2824 sdata->name, 2825 bssid, probe_wait_ms, 2826 ifmgd->probe_send_count, max_tries); 2827 #endif 2828 ieee80211_mgd_probe_ap_send(sdata); 2829 } else { 2830 /* 2831 * We actually lost the connection ... or did we? 2832 * Let's make sure! 2833 */ 2834 wiphy_debug(local->hw.wiphy, 2835 "%s: No probe response from AP %pM" 2836 " after %dms, disconnecting.\n", 2837 sdata->name, 2838 bssid, probe_wait_ms); 2839 2840 ieee80211_sta_connection_lost(sdata, bssid, 2841 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2842 } 2843 } 2844 2845 mutex_unlock(&ifmgd->mtx); 2846 2847 mutex_lock(&local->mtx); 2848 ieee80211_recalc_idle(local); 2849 mutex_unlock(&local->mtx); 2850 } 2851 2852 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 2853 { 2854 struct ieee80211_sub_if_data *sdata = 2855 (struct ieee80211_sub_if_data *) data; 2856 struct ieee80211_local *local = sdata->local; 2857 2858 if (local->quiescing) 2859 return; 2860 2861 ieee80211_queue_work(&sdata->local->hw, 2862 &sdata->u.mgd.beacon_connection_loss_work); 2863 } 2864 2865 static void ieee80211_sta_conn_mon_timer(unsigned long data) 2866 { 2867 struct ieee80211_sub_if_data *sdata = 2868 (struct ieee80211_sub_if_data *) data; 2869 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2870 struct ieee80211_local *local = sdata->local; 2871 2872 if (local->quiescing) 2873 return; 2874 2875 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 2876 } 2877 2878 static void ieee80211_sta_monitor_work(struct work_struct *work) 2879 { 2880 struct ieee80211_sub_if_data *sdata = 2881 container_of(work, struct ieee80211_sub_if_data, 2882 u.mgd.monitor_work); 2883 2884 ieee80211_mgd_probe_ap(sdata, false); 2885 } 2886 2887 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2888 { 2889 u32 flags; 2890 2891 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 2892 __ieee80211_stop_poll(sdata); 2893 2894 /* let's probe the connection once */ 2895 flags = sdata->local->hw.flags; 2896 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) 2897 ieee80211_queue_work(&sdata->local->hw, 2898 &sdata->u.mgd.monitor_work); 2899 /* and do all the other regular work too */ 2900 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2901 } 2902 } 2903 2904 #ifdef CONFIG_PM 2905 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 2906 { 2907 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2908 2909 /* 2910 * we need to use atomic bitops for the running bits 2911 * only because both timers might fire at the same 2912 * time -- the code here is properly synchronised. 2913 */ 2914 2915 cancel_work_sync(&ifmgd->request_smps_work); 2916 2917 cancel_work_sync(&ifmgd->monitor_work); 2918 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 2919 if (del_timer_sync(&ifmgd->timer)) 2920 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 2921 2922 cancel_work_sync(&ifmgd->chswitch_work); 2923 if (del_timer_sync(&ifmgd->chswitch_timer)) 2924 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 2925 2926 /* these will just be re-established on connection */ 2927 del_timer_sync(&ifmgd->conn_mon_timer); 2928 del_timer_sync(&ifmgd->bcn_mon_timer); 2929 } 2930 2931 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 2932 { 2933 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2934 2935 if (!ifmgd->associated) 2936 return; 2937 2938 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 2939 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 2940 mutex_lock(&ifmgd->mtx); 2941 if (ifmgd->associated) { 2942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2943 wiphy_debug(sdata->local->hw.wiphy, 2944 "%s: driver requested disconnect after resume.\n", 2945 sdata->name); 2946 #endif 2947 ieee80211_sta_connection_lost(sdata, 2948 ifmgd->associated->bssid, 2949 WLAN_REASON_UNSPECIFIED); 2950 mutex_unlock(&ifmgd->mtx); 2951 return; 2952 } 2953 mutex_unlock(&ifmgd->mtx); 2954 } 2955 2956 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 2957 add_timer(&ifmgd->timer); 2958 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 2959 add_timer(&ifmgd->chswitch_timer); 2960 ieee80211_sta_reset_beacon_monitor(sdata); 2961 2962 mutex_lock(&sdata->local->mtx); 2963 ieee80211_restart_sta_timer(sdata); 2964 mutex_unlock(&sdata->local->mtx); 2965 } 2966 #endif 2967 2968 /* interface setup */ 2969 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2970 { 2971 struct ieee80211_if_managed *ifmgd; 2972 2973 ifmgd = &sdata->u.mgd; 2974 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 2975 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 2976 INIT_WORK(&ifmgd->beacon_connection_loss_work, 2977 ieee80211_beacon_connection_loss_work); 2978 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 2979 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 2980 (unsigned long) sdata); 2981 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 2982 (unsigned long) sdata); 2983 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 2984 (unsigned long) sdata); 2985 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 2986 (unsigned long) sdata); 2987 2988 ifmgd->flags = 0; 2989 ifmgd->powersave = sdata->wdev.ps; 2990 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 2991 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 2992 2993 mutex_init(&ifmgd->mtx); 2994 2995 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 2996 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 2997 else 2998 ifmgd->req_smps = IEEE80211_SMPS_OFF; 2999 } 3000 3001 /* scan finished notification */ 3002 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 3003 { 3004 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 3005 3006 /* Restart STA timers */ 3007 rcu_read_lock(); 3008 list_for_each_entry_rcu(sdata, &local->interfaces, list) 3009 ieee80211_restart_sta_timer(sdata); 3010 rcu_read_unlock(); 3011 } 3012 3013 int ieee80211_max_network_latency(struct notifier_block *nb, 3014 unsigned long data, void *dummy) 3015 { 3016 s32 latency_usec = (s32) data; 3017 struct ieee80211_local *local = 3018 container_of(nb, struct ieee80211_local, 3019 network_latency_notifier); 3020 3021 mutex_lock(&local->iflist_mtx); 3022 ieee80211_recalc_ps(local, latency_usec); 3023 mutex_unlock(&local->iflist_mtx); 3024 3025 return 0; 3026 } 3027 3028 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 3029 struct cfg80211_bss *cbss, bool assoc) 3030 { 3031 struct ieee80211_local *local = sdata->local; 3032 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3033 struct ieee80211_bss *bss = (void *)cbss->priv; 3034 struct sta_info *sta; 3035 bool have_sta = false; 3036 int err; 3037 int ht_cfreq; 3038 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; 3039 const u8 *ht_oper_ie; 3040 const struct ieee80211_ht_operation *ht_oper = NULL; 3041 struct ieee80211_supported_band *sband; 3042 3043 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 3044 return -EINVAL; 3045 3046 if (assoc) { 3047 rcu_read_lock(); 3048 have_sta = sta_info_get(sdata, cbss->bssid); 3049 rcu_read_unlock(); 3050 } 3051 3052 if (!have_sta) { 3053 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 3054 if (!sta) 3055 return -ENOMEM; 3056 } 3057 3058 mutex_lock(&local->mtx); 3059 ieee80211_recalc_idle(sdata->local); 3060 mutex_unlock(&local->mtx); 3061 3062 /* switch to the right channel */ 3063 sband = local->hw.wiphy->bands[cbss->channel->band]; 3064 3065 ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ; 3066 3067 if (sband->ht_cap.ht_supported) { 3068 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION, 3069 cbss->information_elements, 3070 cbss->len_information_elements); 3071 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 3072 ht_oper = (void *)(ht_oper_ie + 2); 3073 } 3074 3075 if (ht_oper) { 3076 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 3077 cbss->channel->band); 3078 /* check that channel matches the right operating channel */ 3079 if (cbss->channel->center_freq != ht_cfreq) { 3080 /* 3081 * It's possible that some APs are confused here; 3082 * Netgear WNDR3700 sometimes reports 4 higher than 3083 * the actual channel in association responses, but 3084 * since we look at probe response/beacon data here 3085 * it should be OK. 3086 */ 3087 printk(KERN_DEBUG 3088 "%s: Wrong control channel: center-freq: %d" 3089 " ht-cfreq: %d ht->primary_chan: %d" 3090 " band: %d. Disabling HT.\n", 3091 sdata->name, cbss->channel->center_freq, 3092 ht_cfreq, ht_oper->primary_chan, 3093 cbss->channel->band); 3094 ht_oper = NULL; 3095 } 3096 } 3097 3098 if (ht_oper) { 3099 channel_type = NL80211_CHAN_HT20; 3100 3101 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 3102 switch (ht_oper->ht_param & 3103 IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 3104 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 3105 channel_type = NL80211_CHAN_HT40PLUS; 3106 break; 3107 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 3108 channel_type = NL80211_CHAN_HT40MINUS; 3109 break; 3110 } 3111 } 3112 } 3113 3114 if (!ieee80211_set_channel_type(local, sdata, channel_type)) { 3115 /* can only fail due to HT40+/- mismatch */ 3116 channel_type = NL80211_CHAN_HT20; 3117 printk(KERN_DEBUG 3118 "%s: disabling 40 MHz due to multi-vif mismatch\n", 3119 sdata->name); 3120 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ; 3121 WARN_ON(!ieee80211_set_channel_type(local, sdata, 3122 channel_type)); 3123 } 3124 3125 local->oper_channel = cbss->channel; 3126 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 3127 3128 if (!have_sta) { 3129 u32 rates = 0, basic_rates = 0; 3130 bool have_higher_than_11mbit; 3131 int min_rate = INT_MAX, min_rate_index = -1; 3132 3133 ieee80211_get_rates(sband, bss->supp_rates, 3134 bss->supp_rates_len, 3135 &rates, &basic_rates, 3136 &have_higher_than_11mbit, 3137 &min_rate, &min_rate_index); 3138 3139 /* 3140 * This used to be a workaround for basic rates missing 3141 * in the association response frame. Now that we no 3142 * longer use the basic rates from there, it probably 3143 * doesn't happen any more, but keep the workaround so 3144 * in case some *other* APs are buggy in different ways 3145 * we can connect -- with a warning. 3146 */ 3147 if (!basic_rates && min_rate_index >= 0) { 3148 printk(KERN_DEBUG 3149 "%s: No basic rates, using min rate instead.\n", 3150 sdata->name); 3151 basic_rates = BIT(min_rate_index); 3152 } 3153 3154 sta->sta.supp_rates[cbss->channel->band] = rates; 3155 sdata->vif.bss_conf.basic_rates = basic_rates; 3156 3157 /* cf. IEEE 802.11 9.2.12 */ 3158 if (local->oper_channel->band == IEEE80211_BAND_2GHZ && 3159 have_higher_than_11mbit) 3160 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 3161 else 3162 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 3163 3164 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 3165 3166 /* tell driver about BSSID and basic rates */ 3167 ieee80211_bss_info_change_notify(sdata, 3168 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES); 3169 3170 if (assoc) 3171 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 3172 3173 err = sta_info_insert(sta); 3174 sta = NULL; 3175 if (err) { 3176 printk(KERN_DEBUG 3177 "%s: failed to insert STA entry for the AP (error %d)\n", 3178 sdata->name, err); 3179 return err; 3180 } 3181 } else 3182 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 3183 3184 return 0; 3185 } 3186 3187 /* config hooks */ 3188 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 3189 struct cfg80211_auth_request *req) 3190 { 3191 struct ieee80211_local *local = sdata->local; 3192 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3193 struct ieee80211_mgd_auth_data *auth_data; 3194 u16 auth_alg; 3195 int err; 3196 3197 /* prepare auth data structure */ 3198 3199 switch (req->auth_type) { 3200 case NL80211_AUTHTYPE_OPEN_SYSTEM: 3201 auth_alg = WLAN_AUTH_OPEN; 3202 break; 3203 case NL80211_AUTHTYPE_SHARED_KEY: 3204 if (IS_ERR(local->wep_tx_tfm)) 3205 return -EOPNOTSUPP; 3206 auth_alg = WLAN_AUTH_SHARED_KEY; 3207 break; 3208 case NL80211_AUTHTYPE_FT: 3209 auth_alg = WLAN_AUTH_FT; 3210 break; 3211 case NL80211_AUTHTYPE_NETWORK_EAP: 3212 auth_alg = WLAN_AUTH_LEAP; 3213 break; 3214 default: 3215 return -EOPNOTSUPP; 3216 } 3217 3218 auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL); 3219 if (!auth_data) 3220 return -ENOMEM; 3221 3222 auth_data->bss = req->bss; 3223 3224 if (req->ie && req->ie_len) { 3225 memcpy(auth_data->ie, req->ie, req->ie_len); 3226 auth_data->ie_len = req->ie_len; 3227 } 3228 3229 if (req->key && req->key_len) { 3230 auth_data->key_len = req->key_len; 3231 auth_data->key_idx = req->key_idx; 3232 memcpy(auth_data->key, req->key, req->key_len); 3233 } 3234 3235 auth_data->algorithm = auth_alg; 3236 3237 /* try to authenticate/probe */ 3238 3239 mutex_lock(&ifmgd->mtx); 3240 3241 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 3242 ifmgd->assoc_data) { 3243 err = -EBUSY; 3244 goto err_free; 3245 } 3246 3247 if (ifmgd->auth_data) 3248 ieee80211_destroy_auth_data(sdata, false); 3249 3250 /* prep auth_data so we don't go into idle on disassoc */ 3251 ifmgd->auth_data = auth_data; 3252 3253 if (ifmgd->associated) 3254 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 3255 3256 printk(KERN_DEBUG "%s: authenticate with %pM\n", 3257 sdata->name, req->bss->bssid); 3258 3259 err = ieee80211_prep_connection(sdata, req->bss, false); 3260 if (err) 3261 goto err_clear; 3262 3263 err = ieee80211_probe_auth(sdata); 3264 if (err) { 3265 sta_info_destroy_addr(sdata, req->bss->bssid); 3266 goto err_clear; 3267 } 3268 3269 /* hold our own reference */ 3270 cfg80211_ref_bss(auth_data->bss); 3271 err = 0; 3272 goto out_unlock; 3273 3274 err_clear: 3275 ifmgd->auth_data = NULL; 3276 err_free: 3277 kfree(auth_data); 3278 out_unlock: 3279 mutex_unlock(&ifmgd->mtx); 3280 3281 return err; 3282 } 3283 3284 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 3285 struct cfg80211_assoc_request *req) 3286 { 3287 struct ieee80211_local *local = sdata->local; 3288 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3289 struct ieee80211_bss *bss = (void *)req->bss->priv; 3290 struct ieee80211_mgd_assoc_data *assoc_data; 3291 struct ieee80211_supported_band *sband; 3292 const u8 *ssidie; 3293 int i, err; 3294 3295 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 3296 if (!ssidie) 3297 return -EINVAL; 3298 3299 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 3300 if (!assoc_data) 3301 return -ENOMEM; 3302 3303 mutex_lock(&ifmgd->mtx); 3304 3305 if (ifmgd->associated) 3306 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 3307 3308 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 3309 err = -EBUSY; 3310 goto err_free; 3311 } 3312 3313 if (ifmgd->assoc_data) { 3314 err = -EBUSY; 3315 goto err_free; 3316 } 3317 3318 if (ifmgd->auth_data) { 3319 bool match; 3320 3321 /* keep sta info, bssid if matching */ 3322 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 3323 ieee80211_destroy_auth_data(sdata, match); 3324 } 3325 3326 /* prepare assoc data */ 3327 3328 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; 3329 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 3330 3331 ifmgd->beacon_crc_valid = false; 3332 3333 /* 3334 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 3335 * We still associate in non-HT mode (11a/b/g) if any one of these 3336 * ciphers is configured as pairwise. 3337 * We can set this to true for non-11n hardware, that'll be checked 3338 * separately along with the peer capabilities. 3339 */ 3340 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) 3341 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 3342 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 3343 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) 3344 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3345 3346 if (req->flags & ASSOC_REQ_DISABLE_HT) 3347 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3348 3349 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 3350 sband = local->hw.wiphy->bands[req->bss->channel->band]; 3351 if (!sband->ht_cap.ht_supported || 3352 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) 3353 ifmgd->flags |= IEEE80211_STA_DISABLE_11N; 3354 3355 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 3356 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 3357 sizeof(ifmgd->ht_capa_mask)); 3358 3359 if (req->ie && req->ie_len) { 3360 memcpy(assoc_data->ie, req->ie, req->ie_len); 3361 assoc_data->ie_len = req->ie_len; 3362 } 3363 3364 assoc_data->bss = req->bss; 3365 3366 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 3367 if (ifmgd->powersave) 3368 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; 3369 else 3370 ifmgd->ap_smps = IEEE80211_SMPS_OFF; 3371 } else 3372 ifmgd->ap_smps = ifmgd->req_smps; 3373 3374 assoc_data->capability = req->bss->capability; 3375 assoc_data->wmm = bss->wmm_used && 3376 (local->hw.queues >= IEEE80211_NUM_ACS); 3377 assoc_data->supp_rates = bss->supp_rates; 3378 assoc_data->supp_rates_len = bss->supp_rates_len; 3379 assoc_data->ht_operation_ie = 3380 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 3381 3382 if (bss->wmm_used && bss->uapsd_supported && 3383 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 3384 assoc_data->uapsd = true; 3385 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 3386 } else { 3387 assoc_data->uapsd = false; 3388 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 3389 } 3390 3391 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 3392 assoc_data->ssid_len = ssidie[1]; 3393 3394 if (req->prev_bssid) 3395 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 3396 3397 if (req->use_mfp) { 3398 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 3399 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 3400 } else { 3401 ifmgd->mfp = IEEE80211_MFP_DISABLED; 3402 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 3403 } 3404 3405 if (req->crypto.control_port) 3406 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 3407 else 3408 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 3409 3410 sdata->control_port_protocol = req->crypto.control_port_ethertype; 3411 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 3412 3413 /* kick off associate process */ 3414 3415 ifmgd->assoc_data = assoc_data; 3416 3417 err = ieee80211_prep_connection(sdata, req->bss, true); 3418 if (err) 3419 goto err_clear; 3420 3421 if (!bss->dtim_period && 3422 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) { 3423 /* 3424 * Wait up to one beacon interval ... 3425 * should this be more if we miss one? 3426 */ 3427 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n", 3428 sdata->name, ifmgd->bssid); 3429 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 3430 } else { 3431 assoc_data->have_beacon = true; 3432 assoc_data->sent_assoc = false; 3433 assoc_data->timeout = jiffies; 3434 } 3435 run_again(ifmgd, assoc_data->timeout); 3436 3437 if (bss->corrupt_data) { 3438 char *corrupt_type = "data"; 3439 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 3440 if (bss->corrupt_data & 3441 IEEE80211_BSS_CORRUPT_PROBE_RESP) 3442 corrupt_type = "beacon and probe response"; 3443 else 3444 corrupt_type = "beacon"; 3445 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 3446 corrupt_type = "probe response"; 3447 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n", 3448 sdata->name, corrupt_type); 3449 } 3450 3451 err = 0; 3452 goto out; 3453 err_clear: 3454 ifmgd->assoc_data = NULL; 3455 err_free: 3456 kfree(assoc_data); 3457 out: 3458 mutex_unlock(&ifmgd->mtx); 3459 3460 return err; 3461 } 3462 3463 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 3464 struct cfg80211_deauth_request *req) 3465 { 3466 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3467 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 3468 3469 mutex_lock(&ifmgd->mtx); 3470 3471 if (ifmgd->auth_data) { 3472 ieee80211_destroy_auth_data(sdata, false); 3473 mutex_unlock(&ifmgd->mtx); 3474 return 0; 3475 } 3476 3477 printk(KERN_DEBUG 3478 "%s: deauthenticating from %pM by local choice (reason=%d)\n", 3479 sdata->name, req->bssid, req->reason_code); 3480 3481 if (ifmgd->associated && 3482 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) 3483 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3484 req->reason_code, true, frame_buf); 3485 else 3486 ieee80211_send_deauth_disassoc(sdata, req->bssid, 3487 IEEE80211_STYPE_DEAUTH, 3488 req->reason_code, true, 3489 frame_buf); 3490 mutex_unlock(&ifmgd->mtx); 3491 3492 __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 3493 3494 mutex_lock(&sdata->local->mtx); 3495 ieee80211_recalc_idle(sdata->local); 3496 mutex_unlock(&sdata->local->mtx); 3497 3498 return 0; 3499 } 3500 3501 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 3502 struct cfg80211_disassoc_request *req) 3503 { 3504 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3505 u8 bssid[ETH_ALEN]; 3506 u8 frame_buf[DEAUTH_DISASSOC_LEN]; 3507 3508 mutex_lock(&ifmgd->mtx); 3509 3510 /* 3511 * cfg80211 should catch this ... but it's racy since 3512 * we can receive a disassoc frame, process it, hand it 3513 * to cfg80211 while that's in a locked section already 3514 * trying to tell us that the user wants to disconnect. 3515 */ 3516 if (ifmgd->associated != req->bss) { 3517 mutex_unlock(&ifmgd->mtx); 3518 return -ENOLINK; 3519 } 3520 3521 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n", 3522 sdata->name, req->bss->bssid, req->reason_code); 3523 3524 memcpy(bssid, req->bss->bssid, ETH_ALEN); 3525 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 3526 req->reason_code, !req->local_state_change, 3527 frame_buf); 3528 mutex_unlock(&ifmgd->mtx); 3529 3530 __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); 3531 3532 mutex_lock(&sdata->local->mtx); 3533 ieee80211_recalc_idle(sdata->local); 3534 mutex_unlock(&sdata->local->mtx); 3535 3536 return 0; 3537 } 3538 3539 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 3540 { 3541 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3542 3543 mutex_lock(&ifmgd->mtx); 3544 if (ifmgd->assoc_data) 3545 ieee80211_destroy_assoc_data(sdata, false); 3546 if (ifmgd->auth_data) 3547 ieee80211_destroy_auth_data(sdata, false); 3548 del_timer_sync(&ifmgd->timer); 3549 mutex_unlock(&ifmgd->mtx); 3550 } 3551 3552 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 3553 enum nl80211_cqm_rssi_threshold_event rssi_event, 3554 gfp_t gfp) 3555 { 3556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3557 3558 trace_api_cqm_rssi_notify(sdata, rssi_event); 3559 3560 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 3561 } 3562 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 3563 3564 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif) 3565 { 3566 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3567 return sdata->dev->operstate; 3568 } 3569 EXPORT_SYMBOL(ieee80211_get_operstate); 3570