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 * Copyright 2013-2014 Intel Mobile Communications GmbH 9 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/delay.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/moduleparam.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/crc32.h> 24 #include <linux/slab.h> 25 #include <linux/export.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "rate.h" 32 #include "led.h" 33 34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2) 36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10) 37 #define IEEE80211_AUTH_MAX_TRIES 3 38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2) 41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 42 #define IEEE80211_ASSOC_MAX_TRIES 3 43 44 static int max_nullfunc_tries = 2; 45 module_param(max_nullfunc_tries, int, 0644); 46 MODULE_PARM_DESC(max_nullfunc_tries, 47 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 48 49 static int max_probe_tries = 5; 50 module_param(max_probe_tries, int, 0644); 51 MODULE_PARM_DESC(max_probe_tries, 52 "Maximum probe tries before disconnecting (reason 4)."); 53 54 /* 55 * Beacon loss timeout is calculated as N frames times the 56 * advertised beacon interval. This may need to be somewhat 57 * higher than what hardware might detect to account for 58 * delays in the host processing frames. But since we also 59 * probe on beacon miss before declaring the connection lost 60 * default to what we want. 61 */ 62 static int beacon_loss_count = 7; 63 module_param(beacon_loss_count, int, 0644); 64 MODULE_PARM_DESC(beacon_loss_count, 65 "Number of beacon intervals before we decide beacon was lost."); 66 67 /* 68 * Time the connection can be idle before we probe 69 * it to see if we can still talk to the AP. 70 */ 71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 72 /* 73 * Time we wait for a probe response after sending 74 * a probe request because of beacon loss or for 75 * checking the connection still works. 76 */ 77 static int probe_wait_ms = 500; 78 module_param(probe_wait_ms, int, 0644); 79 MODULE_PARM_DESC(probe_wait_ms, 80 "Maximum time(ms) to wait for probe response" 81 " before disconnecting (reason 4)."); 82 83 /* 84 * How many Beacon frames need to have been used in average signal strength 85 * before starting to indicate signal change events. 86 */ 87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 88 89 /* 90 * We can have multiple work items (and connection probing) 91 * scheduling this timer, but we need to take care to only 92 * reschedule it when it should fire _earlier_ than it was 93 * asked for before, or if it's not pending right now. This 94 * function ensures that. Note that it then is required to 95 * run this function for all timeouts after the first one 96 * has happened -- the work that runs from this timer will 97 * do that. 98 */ 99 static void run_again(struct ieee80211_sub_if_data *sdata, 100 unsigned long timeout) 101 { 102 sdata_assert_lock(sdata); 103 104 if (!timer_pending(&sdata->u.mgd.timer) || 105 time_before(timeout, sdata->u.mgd.timer.expires)) 106 mod_timer(&sdata->u.mgd.timer, timeout); 107 } 108 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 110 { 111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 112 return; 113 114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 115 return; 116 117 mod_timer(&sdata->u.mgd.bcn_mon_timer, 118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 119 } 120 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 122 { 123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 124 125 if (unlikely(!sdata->u.mgd.associated)) 126 return; 127 128 ifmgd->probe_send_count = 0; 129 130 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 131 return; 132 133 mod_timer(&sdata->u.mgd.conn_mon_timer, 134 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 135 } 136 137 static int ecw2cw(int ecw) 138 { 139 return (1 << ecw) - 1; 140 } 141 142 static u32 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 144 struct ieee80211_supported_band *sband, 145 struct ieee80211_channel *channel, 146 const struct ieee80211_ht_cap *ht_cap, 147 const struct ieee80211_ht_operation *ht_oper, 148 const struct ieee80211_vht_operation *vht_oper, 149 struct cfg80211_chan_def *chandef, bool tracking) 150 { 151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 152 struct cfg80211_chan_def vht_chandef; 153 struct ieee80211_sta_ht_cap sta_ht_cap; 154 u32 ht_cfreq, ret; 155 156 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 157 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 158 159 chandef->chan = channel; 160 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 161 chandef->center_freq1 = channel->center_freq; 162 chandef->center_freq2 = 0; 163 164 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) { 165 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 166 goto out; 167 } 168 169 chandef->width = NL80211_CHAN_WIDTH_20; 170 171 if (!(ht_cap->cap_info & 172 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) { 173 ret = IEEE80211_STA_DISABLE_40MHZ; 174 vht_chandef = *chandef; 175 goto out; 176 } 177 178 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 179 channel->band); 180 /* check that channel matches the right operating channel */ 181 if (!tracking && channel->center_freq != ht_cfreq) { 182 /* 183 * It's possible that some APs are confused here; 184 * Netgear WNDR3700 sometimes reports 4 higher than 185 * the actual channel in association responses, but 186 * since we look at probe response/beacon data here 187 * it should be OK. 188 */ 189 sdata_info(sdata, 190 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 191 channel->center_freq, ht_cfreq, 192 ht_oper->primary_chan, channel->band); 193 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 194 goto out; 195 } 196 197 /* check 40 MHz support, if we have it */ 198 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 199 ieee80211_chandef_ht_oper(ht_oper, chandef); 200 } else { 201 /* 40 MHz (and 80 MHz) must be supported for VHT */ 202 ret = IEEE80211_STA_DISABLE_VHT; 203 /* also mark 40 MHz disabled */ 204 ret |= IEEE80211_STA_DISABLE_40MHZ; 205 goto out; 206 } 207 208 if (!vht_oper || !sband->vht_cap.vht_supported) { 209 ret = IEEE80211_STA_DISABLE_VHT; 210 goto out; 211 } 212 213 vht_chandef = *chandef; 214 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) { 215 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 216 sdata_info(sdata, 217 "AP VHT information is invalid, disable VHT\n"); 218 ret = IEEE80211_STA_DISABLE_VHT; 219 goto out; 220 } 221 222 if (!cfg80211_chandef_valid(&vht_chandef)) { 223 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 224 sdata_info(sdata, 225 "AP VHT information is invalid, disable VHT\n"); 226 ret = IEEE80211_STA_DISABLE_VHT; 227 goto out; 228 } 229 230 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 231 ret = 0; 232 goto out; 233 } 234 235 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 236 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 237 sdata_info(sdata, 238 "AP VHT information doesn't match HT, disable VHT\n"); 239 ret = IEEE80211_STA_DISABLE_VHT; 240 goto out; 241 } 242 243 *chandef = vht_chandef; 244 245 ret = 0; 246 247 out: 248 /* 249 * When tracking the current AP, don't do any further checks if the 250 * new chandef is identical to the one we're currently using for the 251 * connection. This keeps us from playing ping-pong with regulatory, 252 * without it the following can happen (for example): 253 * - connect to an AP with 80 MHz, world regdom allows 80 MHz 254 * - AP advertises regdom US 255 * - CRDA loads regdom US with 80 MHz prohibited (old database) 256 * - the code below detects an unsupported channel, downgrades, and 257 * we disconnect from the AP in the caller 258 * - disconnect causes CRDA to reload world regdomain and the game 259 * starts anew. 260 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) 261 * 262 * It seems possible that there are still scenarios with CSA or real 263 * bandwidth changes where a this could happen, but those cases are 264 * less common and wouldn't completely prevent using the AP. 265 */ 266 if (tracking && 267 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) 268 return ret; 269 270 /* don't print the message below for VHT mismatch if VHT is disabled */ 271 if (ret & IEEE80211_STA_DISABLE_VHT) 272 vht_chandef = *chandef; 273 274 /* 275 * Ignore the DISABLED flag when we're already connected and only 276 * tracking the APs beacon for bandwidth changes - otherwise we 277 * might get disconnected here if we connect to an AP, update our 278 * regulatory information based on the AP's country IE and the 279 * information we have is wrong/outdated and disables the channel 280 * that we're actually using for the connection to the AP. 281 */ 282 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 283 tracking ? 0 : 284 IEEE80211_CHAN_DISABLED)) { 285 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 286 ret = IEEE80211_STA_DISABLE_HT | 287 IEEE80211_STA_DISABLE_VHT; 288 break; 289 } 290 291 ret |= ieee80211_chandef_downgrade(chandef); 292 } 293 294 if (chandef->width != vht_chandef.width && !tracking) 295 sdata_info(sdata, 296 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 297 298 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 299 return ret; 300 } 301 302 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 303 struct sta_info *sta, 304 const struct ieee80211_ht_cap *ht_cap, 305 const struct ieee80211_ht_operation *ht_oper, 306 const struct ieee80211_vht_operation *vht_oper, 307 const u8 *bssid, u32 *changed) 308 { 309 struct ieee80211_local *local = sdata->local; 310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 311 struct ieee80211_supported_band *sband; 312 struct ieee80211_channel *chan; 313 struct cfg80211_chan_def chandef; 314 u16 ht_opmode; 315 u32 flags; 316 enum ieee80211_sta_rx_bandwidth new_sta_bw; 317 int ret; 318 319 /* if HT was/is disabled, don't track any bandwidth changes */ 320 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 321 return 0; 322 323 /* don't check VHT if we associated as non-VHT station */ 324 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 325 vht_oper = NULL; 326 327 if (WARN_ON_ONCE(!sta)) 328 return -EINVAL; 329 330 /* 331 * if bss configuration changed store the new one - 332 * this may be applicable even if channel is identical 333 */ 334 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 335 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 336 *changed |= BSS_CHANGED_HT; 337 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 338 } 339 340 chan = sdata->vif.bss_conf.chandef.chan; 341 sband = local->hw.wiphy->bands[chan->band]; 342 343 /* calculate new channel (type) based on HT/VHT operation IEs */ 344 flags = ieee80211_determine_chantype(sdata, sband, chan, 345 ht_cap, ht_oper, vht_oper, 346 &chandef, true); 347 348 /* 349 * Downgrade the new channel if we associated with restricted 350 * capabilities. For example, if we associated as a 20 MHz STA 351 * to a 40 MHz AP (due to regulatory, capabilities or config 352 * reasons) then switching to a 40 MHz channel now won't do us 353 * any good -- we couldn't use it with the AP. 354 */ 355 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 356 chandef.width == NL80211_CHAN_WIDTH_80P80) 357 flags |= ieee80211_chandef_downgrade(&chandef); 358 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 359 chandef.width == NL80211_CHAN_WIDTH_160) 360 flags |= ieee80211_chandef_downgrade(&chandef); 361 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 362 chandef.width > NL80211_CHAN_WIDTH_20) 363 flags |= ieee80211_chandef_downgrade(&chandef); 364 365 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 366 return 0; 367 368 sdata_info(sdata, 369 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 370 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 371 chandef.center_freq1, chandef.center_freq2); 372 373 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 374 IEEE80211_STA_DISABLE_VHT | 375 IEEE80211_STA_DISABLE_40MHZ | 376 IEEE80211_STA_DISABLE_80P80MHZ | 377 IEEE80211_STA_DISABLE_160MHZ)) || 378 !cfg80211_chandef_valid(&chandef)) { 379 sdata_info(sdata, 380 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 381 ifmgd->bssid); 382 return -EINVAL; 383 } 384 385 switch (chandef.width) { 386 case NL80211_CHAN_WIDTH_20_NOHT: 387 case NL80211_CHAN_WIDTH_20: 388 new_sta_bw = IEEE80211_STA_RX_BW_20; 389 break; 390 case NL80211_CHAN_WIDTH_40: 391 new_sta_bw = IEEE80211_STA_RX_BW_40; 392 break; 393 case NL80211_CHAN_WIDTH_80: 394 new_sta_bw = IEEE80211_STA_RX_BW_80; 395 break; 396 case NL80211_CHAN_WIDTH_80P80: 397 case NL80211_CHAN_WIDTH_160: 398 new_sta_bw = IEEE80211_STA_RX_BW_160; 399 break; 400 default: 401 return -EINVAL; 402 } 403 404 if (new_sta_bw > sta->cur_max_bandwidth) 405 new_sta_bw = sta->cur_max_bandwidth; 406 407 if (new_sta_bw < sta->sta.bandwidth) { 408 sta->sta.bandwidth = new_sta_bw; 409 rate_control_rate_update(local, sband, sta, 410 IEEE80211_RC_BW_CHANGED); 411 } 412 413 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 414 if (ret) { 415 sdata_info(sdata, 416 "AP %pM changed bandwidth to incompatible one - disconnect\n", 417 ifmgd->bssid); 418 return ret; 419 } 420 421 if (new_sta_bw > sta->sta.bandwidth) { 422 sta->sta.bandwidth = new_sta_bw; 423 rate_control_rate_update(local, sband, sta, 424 IEEE80211_RC_BW_CHANGED); 425 } 426 427 return 0; 428 } 429 430 /* frame sending functions */ 431 432 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 433 struct sk_buff *skb, u8 ap_ht_param, 434 struct ieee80211_supported_band *sband, 435 struct ieee80211_channel *channel, 436 enum ieee80211_smps_mode smps) 437 { 438 u8 *pos; 439 u32 flags = channel->flags; 440 u16 cap; 441 struct ieee80211_sta_ht_cap ht_cap; 442 443 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 444 445 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 446 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 447 448 /* determine capability flags */ 449 cap = ht_cap.cap; 450 451 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 452 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 453 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 454 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 455 cap &= ~IEEE80211_HT_CAP_SGI_40; 456 } 457 break; 458 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 459 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 460 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 461 cap &= ~IEEE80211_HT_CAP_SGI_40; 462 } 463 break; 464 } 465 466 /* 467 * If 40 MHz was disabled associate as though we weren't 468 * capable of 40 MHz -- some broken APs will never fall 469 * back to trying to transmit in 20 MHz. 470 */ 471 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 472 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 473 cap &= ~IEEE80211_HT_CAP_SGI_40; 474 } 475 476 /* set SM PS mode properly */ 477 cap &= ~IEEE80211_HT_CAP_SM_PS; 478 switch (smps) { 479 case IEEE80211_SMPS_AUTOMATIC: 480 case IEEE80211_SMPS_NUM_MODES: 481 WARN_ON(1); 482 case IEEE80211_SMPS_OFF: 483 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 484 IEEE80211_HT_CAP_SM_PS_SHIFT; 485 break; 486 case IEEE80211_SMPS_STATIC: 487 cap |= WLAN_HT_CAP_SM_PS_STATIC << 488 IEEE80211_HT_CAP_SM_PS_SHIFT; 489 break; 490 case IEEE80211_SMPS_DYNAMIC: 491 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 492 IEEE80211_HT_CAP_SM_PS_SHIFT; 493 break; 494 } 495 496 /* reserve and fill IE */ 497 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 498 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 499 } 500 501 /* This function determines vht capability flags for the association 502 * and builds the IE. 503 * Note - the function may set the owner of the MU-MIMO capability 504 */ 505 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 506 struct sk_buff *skb, 507 struct ieee80211_supported_band *sband, 508 struct ieee80211_vht_cap *ap_vht_cap) 509 { 510 struct ieee80211_local *local = sdata->local; 511 u8 *pos; 512 u32 cap; 513 struct ieee80211_sta_vht_cap vht_cap; 514 u32 mask, ap_bf_sts, our_bf_sts; 515 516 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 517 518 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 519 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 520 521 /* determine capability flags */ 522 cap = vht_cap.cap; 523 524 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 525 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 526 527 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 528 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 529 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 530 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 531 } 532 533 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 534 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 535 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 536 } 537 538 /* 539 * Some APs apparently get confused if our capabilities are better 540 * than theirs, so restrict what we advertise in the assoc request. 541 */ 542 if (!(ap_vht_cap->vht_cap_info & 543 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 544 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 545 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE); 546 else if (!(ap_vht_cap->vht_cap_info & 547 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE))) 548 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 549 550 /* 551 * If some other vif is using the MU-MIMO capablity we cannot associate 552 * using MU-MIMO - this will lead to contradictions in the group-id 553 * mechanism. 554 * Ownership is defined since association request, in order to avoid 555 * simultaneous associations with MU-MIMO. 556 */ 557 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) { 558 bool disable_mu_mimo = false; 559 struct ieee80211_sub_if_data *other; 560 561 list_for_each_entry_rcu(other, &local->interfaces, list) { 562 if (other->vif.mu_mimo_owner) { 563 disable_mu_mimo = true; 564 break; 565 } 566 } 567 if (disable_mu_mimo) 568 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 569 else 570 sdata->vif.mu_mimo_owner = true; 571 } 572 573 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 574 575 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 576 our_bf_sts = cap & mask; 577 578 if (ap_bf_sts < our_bf_sts) { 579 cap &= ~mask; 580 cap |= ap_bf_sts; 581 } 582 583 /* reserve and fill IE */ 584 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 585 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 586 } 587 588 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 589 { 590 struct ieee80211_local *local = sdata->local; 591 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 592 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 593 struct sk_buff *skb; 594 struct ieee80211_mgmt *mgmt; 595 u8 *pos, qos_info; 596 size_t offset = 0, noffset; 597 int i, count, rates_len, supp_rates_len, shift; 598 u16 capab; 599 struct ieee80211_supported_band *sband; 600 struct ieee80211_chanctx_conf *chanctx_conf; 601 struct ieee80211_channel *chan; 602 u32 rate_flags, rates = 0; 603 604 sdata_assert_lock(sdata); 605 606 rcu_read_lock(); 607 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 608 if (WARN_ON(!chanctx_conf)) { 609 rcu_read_unlock(); 610 return; 611 } 612 chan = chanctx_conf->def.chan; 613 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 614 rcu_read_unlock(); 615 sband = local->hw.wiphy->bands[chan->band]; 616 shift = ieee80211_vif_get_shift(&sdata->vif); 617 618 if (assoc_data->supp_rates_len) { 619 /* 620 * Get all rates supported by the device and the AP as 621 * some APs don't like getting a superset of their rates 622 * in the association request (e.g. D-Link DAP 1353 in 623 * b-only mode)... 624 */ 625 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 626 assoc_data->supp_rates, 627 assoc_data->supp_rates_len, 628 &rates); 629 } else { 630 /* 631 * In case AP not provide any supported rates information 632 * before association, we send information element(s) with 633 * all rates that we support. 634 */ 635 rates_len = 0; 636 for (i = 0; i < sband->n_bitrates; i++) { 637 if ((rate_flags & sband->bitrates[i].flags) 638 != rate_flags) 639 continue; 640 rates |= BIT(i); 641 rates_len++; 642 } 643 } 644 645 skb = alloc_skb(local->hw.extra_tx_headroom + 646 sizeof(*mgmt) + /* bit too much but doesn't matter */ 647 2 + assoc_data->ssid_len + /* SSID */ 648 4 + rates_len + /* (extended) rates */ 649 4 + /* power capability */ 650 2 + 2 * sband->n_channels + /* supported channels */ 651 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 652 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 653 assoc_data->ie_len + /* extra IEs */ 654 9, /* WMM */ 655 GFP_KERNEL); 656 if (!skb) 657 return; 658 659 skb_reserve(skb, local->hw.extra_tx_headroom); 660 661 capab = WLAN_CAPABILITY_ESS; 662 663 if (sband->band == IEEE80211_BAND_2GHZ) { 664 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 665 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 666 } 667 668 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 669 capab |= WLAN_CAPABILITY_PRIVACY; 670 671 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 672 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT)) 673 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 674 675 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 676 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 677 678 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 679 memset(mgmt, 0, 24); 680 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 681 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 682 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 683 684 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 685 skb_put(skb, 10); 686 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 687 IEEE80211_STYPE_REASSOC_REQ); 688 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 689 mgmt->u.reassoc_req.listen_interval = 690 cpu_to_le16(local->hw.conf.listen_interval); 691 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 692 ETH_ALEN); 693 } else { 694 skb_put(skb, 4); 695 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 696 IEEE80211_STYPE_ASSOC_REQ); 697 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 698 mgmt->u.assoc_req.listen_interval = 699 cpu_to_le16(local->hw.conf.listen_interval); 700 } 701 702 /* SSID */ 703 pos = skb_put(skb, 2 + assoc_data->ssid_len); 704 *pos++ = WLAN_EID_SSID; 705 *pos++ = assoc_data->ssid_len; 706 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 707 708 /* add all rates which were marked to be used above */ 709 supp_rates_len = rates_len; 710 if (supp_rates_len > 8) 711 supp_rates_len = 8; 712 713 pos = skb_put(skb, supp_rates_len + 2); 714 *pos++ = WLAN_EID_SUPP_RATES; 715 *pos++ = supp_rates_len; 716 717 count = 0; 718 for (i = 0; i < sband->n_bitrates; i++) { 719 if (BIT(i) & rates) { 720 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 721 5 * (1 << shift)); 722 *pos++ = (u8) rate; 723 if (++count == 8) 724 break; 725 } 726 } 727 728 if (rates_len > count) { 729 pos = skb_put(skb, rates_len - count + 2); 730 *pos++ = WLAN_EID_EXT_SUPP_RATES; 731 *pos++ = rates_len - count; 732 733 for (i++; i < sband->n_bitrates; i++) { 734 if (BIT(i) & rates) { 735 int rate; 736 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 737 5 * (1 << shift)); 738 *pos++ = (u8) rate; 739 } 740 } 741 } 742 743 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 744 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 745 pos = skb_put(skb, 4); 746 *pos++ = WLAN_EID_PWR_CAPABILITY; 747 *pos++ = 2; 748 *pos++ = 0; /* min tx power */ 749 /* max tx power */ 750 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 751 } 752 753 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 754 /* TODO: get this in reg domain format */ 755 pos = skb_put(skb, 2 * sband->n_channels + 2); 756 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 757 *pos++ = 2 * sband->n_channels; 758 for (i = 0; i < sband->n_channels; i++) { 759 *pos++ = ieee80211_frequency_to_channel( 760 sband->channels[i].center_freq); 761 *pos++ = 1; /* one channel in the subband*/ 762 } 763 } 764 765 /* if present, add any custom IEs that go before HT */ 766 if (assoc_data->ie_len) { 767 static const u8 before_ht[] = { 768 WLAN_EID_SSID, 769 WLAN_EID_SUPP_RATES, 770 WLAN_EID_EXT_SUPP_RATES, 771 WLAN_EID_PWR_CAPABILITY, 772 WLAN_EID_SUPPORTED_CHANNELS, 773 WLAN_EID_RSN, 774 WLAN_EID_QOS_CAPA, 775 WLAN_EID_RRM_ENABLED_CAPABILITIES, 776 WLAN_EID_MOBILITY_DOMAIN, 777 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 778 WLAN_EID_RIC_DATA, /* reassoc only */ 779 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 780 }; 781 static const u8 after_ric[] = { 782 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 783 WLAN_EID_HT_CAPABILITY, 784 WLAN_EID_BSS_COEX_2040, 785 WLAN_EID_EXT_CAPABILITY, 786 WLAN_EID_QOS_TRAFFIC_CAPA, 787 WLAN_EID_TIM_BCAST_REQ, 788 WLAN_EID_INTERWORKING, 789 /* 60GHz doesn't happen right now */ 790 WLAN_EID_VHT_CAPABILITY, 791 WLAN_EID_OPMODE_NOTIF, 792 }; 793 794 noffset = ieee80211_ie_split_ric(assoc_data->ie, 795 assoc_data->ie_len, 796 before_ht, 797 ARRAY_SIZE(before_ht), 798 after_ric, 799 ARRAY_SIZE(after_ric), 800 offset); 801 pos = skb_put(skb, noffset - offset); 802 memcpy(pos, assoc_data->ie + offset, noffset - offset); 803 offset = noffset; 804 } 805 806 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 807 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 808 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 809 810 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 811 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 812 sband, chan, sdata->smps_mode); 813 814 /* if present, add any custom IEs that go before VHT */ 815 if (assoc_data->ie_len) { 816 static const u8 before_vht[] = { 817 WLAN_EID_SSID, 818 WLAN_EID_SUPP_RATES, 819 WLAN_EID_EXT_SUPP_RATES, 820 WLAN_EID_PWR_CAPABILITY, 821 WLAN_EID_SUPPORTED_CHANNELS, 822 WLAN_EID_RSN, 823 WLAN_EID_QOS_CAPA, 824 WLAN_EID_RRM_ENABLED_CAPABILITIES, 825 WLAN_EID_MOBILITY_DOMAIN, 826 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 827 WLAN_EID_HT_CAPABILITY, 828 WLAN_EID_BSS_COEX_2040, 829 WLAN_EID_EXT_CAPABILITY, 830 WLAN_EID_QOS_TRAFFIC_CAPA, 831 WLAN_EID_TIM_BCAST_REQ, 832 WLAN_EID_INTERWORKING, 833 }; 834 835 /* RIC already taken above, so no need to handle here anymore */ 836 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 837 before_vht, ARRAY_SIZE(before_vht), 838 offset); 839 pos = skb_put(skb, noffset - offset); 840 memcpy(pos, assoc_data->ie + offset, noffset - offset); 841 offset = noffset; 842 } 843 844 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 845 ieee80211_add_vht_ie(sdata, skb, sband, 846 &assoc_data->ap_vht_cap); 847 848 /* if present, add any custom non-vendor IEs that go after HT */ 849 if (assoc_data->ie_len) { 850 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 851 assoc_data->ie_len, 852 offset); 853 pos = skb_put(skb, noffset - offset); 854 memcpy(pos, assoc_data->ie + offset, noffset - offset); 855 offset = noffset; 856 } 857 858 if (assoc_data->wmm) { 859 if (assoc_data->uapsd) { 860 qos_info = ifmgd->uapsd_queues; 861 qos_info |= (ifmgd->uapsd_max_sp_len << 862 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 863 } else { 864 qos_info = 0; 865 } 866 867 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 868 } 869 870 /* add any remaining custom (i.e. vendor specific here) IEs */ 871 if (assoc_data->ie_len) { 872 noffset = assoc_data->ie_len; 873 pos = skb_put(skb, noffset - offset); 874 memcpy(pos, assoc_data->ie + offset, noffset - offset); 875 } 876 877 drv_mgd_prepare_tx(local, sdata); 878 879 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 880 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 881 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 882 IEEE80211_TX_INTFL_MLME_CONN_TX; 883 ieee80211_tx_skb(sdata, skb); 884 } 885 886 void ieee80211_send_pspoll(struct ieee80211_local *local, 887 struct ieee80211_sub_if_data *sdata) 888 { 889 struct ieee80211_pspoll *pspoll; 890 struct sk_buff *skb; 891 892 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 893 if (!skb) 894 return; 895 896 pspoll = (struct ieee80211_pspoll *) skb->data; 897 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 898 899 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 900 ieee80211_tx_skb(sdata, skb); 901 } 902 903 void ieee80211_send_nullfunc(struct ieee80211_local *local, 904 struct ieee80211_sub_if_data *sdata, 905 bool powersave) 906 { 907 struct sk_buff *skb; 908 struct ieee80211_hdr_3addr *nullfunc; 909 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 910 911 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 912 if (!skb) 913 return; 914 915 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 916 if (powersave) 917 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 918 919 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 920 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 921 922 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 923 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 924 925 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 926 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 927 928 ieee80211_tx_skb(sdata, skb); 929 } 930 931 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 932 struct ieee80211_sub_if_data *sdata) 933 { 934 struct sk_buff *skb; 935 struct ieee80211_hdr *nullfunc; 936 __le16 fc; 937 938 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 939 return; 940 941 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 942 if (!skb) 943 return; 944 945 skb_reserve(skb, local->hw.extra_tx_headroom); 946 947 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 948 memset(nullfunc, 0, 30); 949 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 950 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 951 nullfunc->frame_control = fc; 952 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 953 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 954 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 955 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 956 957 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 958 ieee80211_tx_skb(sdata, skb); 959 } 960 961 /* spectrum management related things */ 962 static void ieee80211_chswitch_work(struct work_struct *work) 963 { 964 struct ieee80211_sub_if_data *sdata = 965 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 966 struct ieee80211_local *local = sdata->local; 967 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 968 int ret; 969 970 if (!ieee80211_sdata_running(sdata)) 971 return; 972 973 sdata_lock(sdata); 974 mutex_lock(&local->mtx); 975 mutex_lock(&local->chanctx_mtx); 976 977 if (!ifmgd->associated) 978 goto out; 979 980 if (!sdata->vif.csa_active) 981 goto out; 982 983 /* 984 * using reservation isn't immediate as it may be deferred until later 985 * with multi-vif. once reservation is complete it will re-schedule the 986 * work with no reserved_chanctx so verify chandef to check if it 987 * completed successfully 988 */ 989 990 if (sdata->reserved_chanctx) { 991 /* 992 * with multi-vif csa driver may call ieee80211_csa_finish() 993 * many times while waiting for other interfaces to use their 994 * reservations 995 */ 996 if (sdata->reserved_ready) 997 goto out; 998 999 ret = ieee80211_vif_use_reserved_context(sdata); 1000 if (ret) { 1001 sdata_info(sdata, 1002 "failed to use reserved channel context, disconnecting (err=%d)\n", 1003 ret); 1004 ieee80211_queue_work(&sdata->local->hw, 1005 &ifmgd->csa_connection_drop_work); 1006 goto out; 1007 } 1008 1009 goto out; 1010 } 1011 1012 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 1013 &sdata->csa_chandef)) { 1014 sdata_info(sdata, 1015 "failed to finalize channel switch, disconnecting\n"); 1016 ieee80211_queue_work(&sdata->local->hw, 1017 &ifmgd->csa_connection_drop_work); 1018 goto out; 1019 } 1020 1021 /* XXX: shouldn't really modify cfg80211-owned data! */ 1022 ifmgd->associated->channel = sdata->csa_chandef.chan; 1023 1024 ifmgd->csa_waiting_bcn = true; 1025 1026 ieee80211_sta_reset_beacon_monitor(sdata); 1027 ieee80211_sta_reset_conn_monitor(sdata); 1028 1029 out: 1030 mutex_unlock(&local->chanctx_mtx); 1031 mutex_unlock(&local->mtx); 1032 sdata_unlock(sdata); 1033 } 1034 1035 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1036 { 1037 struct ieee80211_local *local = sdata->local; 1038 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1039 int ret; 1040 1041 sdata_assert_lock(sdata); 1042 1043 WARN_ON(!sdata->vif.csa_active); 1044 1045 if (sdata->csa_block_tx) { 1046 ieee80211_wake_vif_queues(local, sdata, 1047 IEEE80211_QUEUE_STOP_REASON_CSA); 1048 sdata->csa_block_tx = false; 1049 } 1050 1051 sdata->vif.csa_active = false; 1052 ifmgd->csa_waiting_bcn = false; 1053 1054 ret = drv_post_channel_switch(sdata); 1055 if (ret) { 1056 sdata_info(sdata, 1057 "driver post channel switch failed, disconnecting\n"); 1058 ieee80211_queue_work(&local->hw, 1059 &ifmgd->csa_connection_drop_work); 1060 return; 1061 } 1062 1063 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1064 } 1065 1066 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1067 { 1068 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1069 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1070 1071 trace_api_chswitch_done(sdata, success); 1072 if (!success) { 1073 sdata_info(sdata, 1074 "driver channel switch failed, disconnecting\n"); 1075 ieee80211_queue_work(&sdata->local->hw, 1076 &ifmgd->csa_connection_drop_work); 1077 } else { 1078 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1079 } 1080 } 1081 EXPORT_SYMBOL(ieee80211_chswitch_done); 1082 1083 static void ieee80211_chswitch_timer(unsigned long data) 1084 { 1085 struct ieee80211_sub_if_data *sdata = 1086 (struct ieee80211_sub_if_data *) data; 1087 1088 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1089 } 1090 1091 static void 1092 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1093 u64 timestamp, u32 device_timestamp, 1094 struct ieee802_11_elems *elems, 1095 bool beacon) 1096 { 1097 struct ieee80211_local *local = sdata->local; 1098 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1099 struct cfg80211_bss *cbss = ifmgd->associated; 1100 struct ieee80211_chanctx_conf *conf; 1101 struct ieee80211_chanctx *chanctx; 1102 enum ieee80211_band current_band; 1103 struct ieee80211_csa_ie csa_ie; 1104 struct ieee80211_channel_switch ch_switch; 1105 int res; 1106 1107 sdata_assert_lock(sdata); 1108 1109 if (!cbss) 1110 return; 1111 1112 if (local->scanning) 1113 return; 1114 1115 /* disregard subsequent announcements if we are already processing */ 1116 if (sdata->vif.csa_active) 1117 return; 1118 1119 current_band = cbss->channel->band; 1120 memset(&csa_ie, 0, sizeof(csa_ie)); 1121 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1122 ifmgd->flags, 1123 ifmgd->associated->bssid, &csa_ie); 1124 if (res < 0) 1125 ieee80211_queue_work(&local->hw, 1126 &ifmgd->csa_connection_drop_work); 1127 if (res) 1128 return; 1129 1130 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1131 IEEE80211_CHAN_DISABLED)) { 1132 sdata_info(sdata, 1133 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1134 ifmgd->associated->bssid, 1135 csa_ie.chandef.chan->center_freq, 1136 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1137 csa_ie.chandef.center_freq2); 1138 ieee80211_queue_work(&local->hw, 1139 &ifmgd->csa_connection_drop_work); 1140 return; 1141 } 1142 1143 if (cfg80211_chandef_identical(&csa_ie.chandef, 1144 &sdata->vif.bss_conf.chandef)) { 1145 if (ifmgd->csa_ignored_same_chan) 1146 return; 1147 sdata_info(sdata, 1148 "AP %pM tries to chanswitch to same channel, ignore\n", 1149 ifmgd->associated->bssid); 1150 ifmgd->csa_ignored_same_chan = true; 1151 return; 1152 } 1153 1154 /* 1155 * Drop all TDLS peers - either we disconnect or move to a different 1156 * channel from this point on. There's no telling what our peer will do. 1157 * The TDLS WIDER_BW scenario is also problematic, as peers might now 1158 * have an incompatible wider chandef. 1159 */ 1160 ieee80211_teardown_tdls_peers(sdata); 1161 1162 mutex_lock(&local->mtx); 1163 mutex_lock(&local->chanctx_mtx); 1164 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1165 lockdep_is_held(&local->chanctx_mtx)); 1166 if (!conf) { 1167 sdata_info(sdata, 1168 "no channel context assigned to vif?, disconnecting\n"); 1169 goto drop_connection; 1170 } 1171 1172 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1173 1174 if (local->use_chanctx && 1175 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) { 1176 sdata_info(sdata, 1177 "driver doesn't support chan-switch with channel contexts\n"); 1178 goto drop_connection; 1179 } 1180 1181 ch_switch.timestamp = timestamp; 1182 ch_switch.device_timestamp = device_timestamp; 1183 ch_switch.block_tx = csa_ie.mode; 1184 ch_switch.chandef = csa_ie.chandef; 1185 ch_switch.count = csa_ie.count; 1186 1187 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1188 sdata_info(sdata, 1189 "preparing for channel switch failed, disconnecting\n"); 1190 goto drop_connection; 1191 } 1192 1193 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1194 chanctx->mode, false); 1195 if (res) { 1196 sdata_info(sdata, 1197 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1198 res); 1199 goto drop_connection; 1200 } 1201 mutex_unlock(&local->chanctx_mtx); 1202 1203 sdata->vif.csa_active = true; 1204 sdata->csa_chandef = csa_ie.chandef; 1205 sdata->csa_block_tx = csa_ie.mode; 1206 ifmgd->csa_ignored_same_chan = false; 1207 1208 if (sdata->csa_block_tx) 1209 ieee80211_stop_vif_queues(local, sdata, 1210 IEEE80211_QUEUE_STOP_REASON_CSA); 1211 mutex_unlock(&local->mtx); 1212 1213 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1214 csa_ie.count); 1215 1216 if (local->ops->channel_switch) { 1217 /* use driver's channel switch callback */ 1218 drv_channel_switch(local, sdata, &ch_switch); 1219 return; 1220 } 1221 1222 /* channel switch handled in software */ 1223 if (csa_ie.count <= 1) 1224 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1225 else 1226 mod_timer(&ifmgd->chswitch_timer, 1227 TU_TO_EXP_TIME((csa_ie.count - 1) * 1228 cbss->beacon_interval)); 1229 return; 1230 drop_connection: 1231 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); 1232 mutex_unlock(&local->chanctx_mtx); 1233 mutex_unlock(&local->mtx); 1234 } 1235 1236 static bool 1237 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1238 struct ieee80211_channel *channel, 1239 const u8 *country_ie, u8 country_ie_len, 1240 const u8 *pwr_constr_elem, 1241 int *chan_pwr, int *pwr_reduction) 1242 { 1243 struct ieee80211_country_ie_triplet *triplet; 1244 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1245 int i, chan_increment; 1246 bool have_chan_pwr = false; 1247 1248 /* Invalid IE */ 1249 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1250 return false; 1251 1252 triplet = (void *)(country_ie + 3); 1253 country_ie_len -= 3; 1254 1255 switch (channel->band) { 1256 default: 1257 WARN_ON_ONCE(1); 1258 /* fall through */ 1259 case IEEE80211_BAND_2GHZ: 1260 case IEEE80211_BAND_60GHZ: 1261 chan_increment = 1; 1262 break; 1263 case IEEE80211_BAND_5GHZ: 1264 chan_increment = 4; 1265 break; 1266 } 1267 1268 /* find channel */ 1269 while (country_ie_len >= 3) { 1270 u8 first_channel = triplet->chans.first_channel; 1271 1272 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1273 goto next; 1274 1275 for (i = 0; i < triplet->chans.num_channels; i++) { 1276 if (first_channel + i * chan_increment == chan) { 1277 have_chan_pwr = true; 1278 *chan_pwr = triplet->chans.max_power; 1279 break; 1280 } 1281 } 1282 if (have_chan_pwr) 1283 break; 1284 1285 next: 1286 triplet++; 1287 country_ie_len -= 3; 1288 } 1289 1290 if (have_chan_pwr && pwr_constr_elem) 1291 *pwr_reduction = *pwr_constr_elem; 1292 else 1293 *pwr_reduction = 0; 1294 1295 return have_chan_pwr; 1296 } 1297 1298 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1299 struct ieee80211_channel *channel, 1300 const u8 *cisco_dtpc_ie, 1301 int *pwr_level) 1302 { 1303 /* From practical testing, the first data byte of the DTPC element 1304 * seems to contain the requested dBm level, and the CLI on Cisco 1305 * APs clearly state the range is -127 to 127 dBm, which indicates 1306 * a signed byte, although it seemingly never actually goes negative. 1307 * The other byte seems to always be zero. 1308 */ 1309 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1310 } 1311 1312 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1313 struct ieee80211_channel *channel, 1314 struct ieee80211_mgmt *mgmt, 1315 const u8 *country_ie, u8 country_ie_len, 1316 const u8 *pwr_constr_ie, 1317 const u8 *cisco_dtpc_ie) 1318 { 1319 bool has_80211h_pwr = false, has_cisco_pwr = false; 1320 int chan_pwr = 0, pwr_reduction_80211h = 0; 1321 int pwr_level_cisco, pwr_level_80211h; 1322 int new_ap_level; 1323 __le16 capab = mgmt->u.probe_resp.capab_info; 1324 1325 if (country_ie && 1326 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1327 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1328 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1329 sdata, channel, country_ie, country_ie_len, 1330 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1331 pwr_level_80211h = 1332 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1333 } 1334 1335 if (cisco_dtpc_ie) { 1336 ieee80211_find_cisco_dtpc( 1337 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1338 has_cisco_pwr = true; 1339 } 1340 1341 if (!has_80211h_pwr && !has_cisco_pwr) 1342 return 0; 1343 1344 /* If we have both 802.11h and Cisco DTPC, apply both limits 1345 * by picking the smallest of the two power levels advertised. 1346 */ 1347 if (has_80211h_pwr && 1348 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1349 new_ap_level = pwr_level_80211h; 1350 1351 if (sdata->ap_power_level == new_ap_level) 1352 return 0; 1353 1354 sdata_dbg(sdata, 1355 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1356 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1357 sdata->u.mgd.bssid); 1358 } else { /* has_cisco_pwr is always true here. */ 1359 new_ap_level = pwr_level_cisco; 1360 1361 if (sdata->ap_power_level == new_ap_level) 1362 return 0; 1363 1364 sdata_dbg(sdata, 1365 "Limiting TX power to %d dBm as advertised by %pM\n", 1366 pwr_level_cisco, sdata->u.mgd.bssid); 1367 } 1368 1369 sdata->ap_power_level = new_ap_level; 1370 if (__ieee80211_recalc_txpower(sdata)) 1371 return BSS_CHANGED_TXPOWER; 1372 return 0; 1373 } 1374 1375 /* powersave */ 1376 static void ieee80211_enable_ps(struct ieee80211_local *local, 1377 struct ieee80211_sub_if_data *sdata) 1378 { 1379 struct ieee80211_conf *conf = &local->hw.conf; 1380 1381 /* 1382 * If we are scanning right now then the parameters will 1383 * take effect when scan finishes. 1384 */ 1385 if (local->scanning) 1386 return; 1387 1388 if (conf->dynamic_ps_timeout > 0 && 1389 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1390 mod_timer(&local->dynamic_ps_timer, jiffies + 1391 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1392 } else { 1393 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1394 ieee80211_send_nullfunc(local, sdata, true); 1395 1396 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1397 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1398 return; 1399 1400 conf->flags |= IEEE80211_CONF_PS; 1401 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1402 } 1403 } 1404 1405 static void ieee80211_change_ps(struct ieee80211_local *local) 1406 { 1407 struct ieee80211_conf *conf = &local->hw.conf; 1408 1409 if (local->ps_sdata) { 1410 ieee80211_enable_ps(local, local->ps_sdata); 1411 } else if (conf->flags & IEEE80211_CONF_PS) { 1412 conf->flags &= ~IEEE80211_CONF_PS; 1413 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1414 del_timer_sync(&local->dynamic_ps_timer); 1415 cancel_work_sync(&local->dynamic_ps_enable_work); 1416 } 1417 } 1418 1419 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1420 { 1421 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1422 struct sta_info *sta = NULL; 1423 bool authorized = false; 1424 1425 if (!mgd->powersave) 1426 return false; 1427 1428 if (mgd->broken_ap) 1429 return false; 1430 1431 if (!mgd->associated) 1432 return false; 1433 1434 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1435 return false; 1436 1437 if (!mgd->have_beacon) 1438 return false; 1439 1440 rcu_read_lock(); 1441 sta = sta_info_get(sdata, mgd->bssid); 1442 if (sta) 1443 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1444 rcu_read_unlock(); 1445 1446 return authorized; 1447 } 1448 1449 /* need to hold RTNL or interface lock */ 1450 void ieee80211_recalc_ps(struct ieee80211_local *local) 1451 { 1452 struct ieee80211_sub_if_data *sdata, *found = NULL; 1453 int count = 0; 1454 int timeout; 1455 1456 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1457 local->ps_sdata = NULL; 1458 return; 1459 } 1460 1461 list_for_each_entry(sdata, &local->interfaces, list) { 1462 if (!ieee80211_sdata_running(sdata)) 1463 continue; 1464 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1465 /* If an AP vif is found, then disable PS 1466 * by setting the count to zero thereby setting 1467 * ps_sdata to NULL. 1468 */ 1469 count = 0; 1470 break; 1471 } 1472 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1473 continue; 1474 found = sdata; 1475 count++; 1476 } 1477 1478 if (count == 1 && ieee80211_powersave_allowed(found)) { 1479 u8 dtimper = found->u.mgd.dtim_period; 1480 s32 beaconint_us; 1481 1482 beaconint_us = ieee80211_tu_to_usec( 1483 found->vif.bss_conf.beacon_int); 1484 1485 timeout = local->dynamic_ps_forced_timeout; 1486 if (timeout < 0) 1487 timeout = 100; 1488 local->hw.conf.dynamic_ps_timeout = timeout; 1489 1490 /* If the TIM IE is invalid, pretend the value is 1 */ 1491 if (!dtimper) 1492 dtimper = 1; 1493 1494 local->hw.conf.ps_dtim_period = dtimper; 1495 local->ps_sdata = found; 1496 } else { 1497 local->ps_sdata = NULL; 1498 } 1499 1500 ieee80211_change_ps(local); 1501 } 1502 1503 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1504 { 1505 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1506 1507 if (sdata->vif.bss_conf.ps != ps_allowed) { 1508 sdata->vif.bss_conf.ps = ps_allowed; 1509 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1510 } 1511 } 1512 1513 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1514 { 1515 struct ieee80211_local *local = 1516 container_of(work, struct ieee80211_local, 1517 dynamic_ps_disable_work); 1518 1519 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1520 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1521 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1522 } 1523 1524 ieee80211_wake_queues_by_reason(&local->hw, 1525 IEEE80211_MAX_QUEUE_MAP, 1526 IEEE80211_QUEUE_STOP_REASON_PS, 1527 false); 1528 } 1529 1530 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1531 { 1532 struct ieee80211_local *local = 1533 container_of(work, struct ieee80211_local, 1534 dynamic_ps_enable_work); 1535 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1536 struct ieee80211_if_managed *ifmgd; 1537 unsigned long flags; 1538 int q; 1539 1540 /* can only happen when PS was just disabled anyway */ 1541 if (!sdata) 1542 return; 1543 1544 ifmgd = &sdata->u.mgd; 1545 1546 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1547 return; 1548 1549 if (local->hw.conf.dynamic_ps_timeout > 0) { 1550 /* don't enter PS if TX frames are pending */ 1551 if (drv_tx_frames_pending(local)) { 1552 mod_timer(&local->dynamic_ps_timer, jiffies + 1553 msecs_to_jiffies( 1554 local->hw.conf.dynamic_ps_timeout)); 1555 return; 1556 } 1557 1558 /* 1559 * transmission can be stopped by others which leads to 1560 * dynamic_ps_timer expiry. Postpone the ps timer if it 1561 * is not the actual idle state. 1562 */ 1563 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1564 for (q = 0; q < local->hw.queues; q++) { 1565 if (local->queue_stop_reasons[q]) { 1566 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1567 flags); 1568 mod_timer(&local->dynamic_ps_timer, jiffies + 1569 msecs_to_jiffies( 1570 local->hw.conf.dynamic_ps_timeout)); 1571 return; 1572 } 1573 } 1574 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1575 } 1576 1577 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1578 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1579 if (drv_tx_frames_pending(local)) { 1580 mod_timer(&local->dynamic_ps_timer, jiffies + 1581 msecs_to_jiffies( 1582 local->hw.conf.dynamic_ps_timeout)); 1583 } else { 1584 ieee80211_send_nullfunc(local, sdata, true); 1585 /* Flush to get the tx status of nullfunc frame */ 1586 ieee80211_flush_queues(local, sdata, false); 1587 } 1588 } 1589 1590 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1591 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1592 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1593 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1594 local->hw.conf.flags |= IEEE80211_CONF_PS; 1595 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1596 } 1597 } 1598 1599 void ieee80211_dynamic_ps_timer(unsigned long data) 1600 { 1601 struct ieee80211_local *local = (void *) data; 1602 1603 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1604 } 1605 1606 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1607 { 1608 struct delayed_work *delayed_work = to_delayed_work(work); 1609 struct ieee80211_sub_if_data *sdata = 1610 container_of(delayed_work, struct ieee80211_sub_if_data, 1611 dfs_cac_timer_work); 1612 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1613 1614 mutex_lock(&sdata->local->mtx); 1615 if (sdata->wdev.cac_started) { 1616 ieee80211_vif_release_channel(sdata); 1617 cfg80211_cac_event(sdata->dev, &chandef, 1618 NL80211_RADAR_CAC_FINISHED, 1619 GFP_KERNEL); 1620 } 1621 mutex_unlock(&sdata->local->mtx); 1622 } 1623 1624 static bool 1625 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1626 { 1627 struct ieee80211_local *local = sdata->local; 1628 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1629 bool ret = false; 1630 int ac; 1631 1632 if (local->hw.queues < IEEE80211_NUM_ACS) 1633 return false; 1634 1635 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1636 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1637 int non_acm_ac; 1638 unsigned long now = jiffies; 1639 1640 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1641 tx_tspec->admitted_time && 1642 time_after(now, tx_tspec->time_slice_start + HZ)) { 1643 tx_tspec->consumed_tx_time = 0; 1644 tx_tspec->time_slice_start = now; 1645 1646 if (tx_tspec->downgraded) 1647 tx_tspec->action = 1648 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1649 } 1650 1651 switch (tx_tspec->action) { 1652 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1653 /* take the original parameters */ 1654 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1655 sdata_err(sdata, 1656 "failed to set TX queue parameters for queue %d\n", 1657 ac); 1658 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1659 tx_tspec->downgraded = false; 1660 ret = true; 1661 break; 1662 case TX_TSPEC_ACTION_DOWNGRADE: 1663 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1664 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1665 ret = true; 1666 break; 1667 } 1668 /* downgrade next lower non-ACM AC */ 1669 for (non_acm_ac = ac + 1; 1670 non_acm_ac < IEEE80211_NUM_ACS; 1671 non_acm_ac++) 1672 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1673 break; 1674 /* The loop will result in using BK even if it requires 1675 * admission control, such configuration makes no sense 1676 * and we have to transmit somehow - the AC selection 1677 * does the same thing. 1678 */ 1679 if (drv_conf_tx(local, sdata, ac, 1680 &sdata->tx_conf[non_acm_ac])) 1681 sdata_err(sdata, 1682 "failed to set TX queue parameters for queue %d\n", 1683 ac); 1684 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1685 ret = true; 1686 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1687 tx_tspec->time_slice_start + HZ - now + 1); 1688 break; 1689 case TX_TSPEC_ACTION_NONE: 1690 /* nothing now */ 1691 break; 1692 } 1693 } 1694 1695 return ret; 1696 } 1697 1698 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1699 { 1700 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1701 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1702 } 1703 1704 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1705 { 1706 struct ieee80211_sub_if_data *sdata; 1707 1708 sdata = container_of(work, struct ieee80211_sub_if_data, 1709 u.mgd.tx_tspec_wk.work); 1710 ieee80211_sta_handle_tspec_ac_params(sdata); 1711 } 1712 1713 /* MLME */ 1714 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1715 struct ieee80211_sub_if_data *sdata, 1716 const u8 *wmm_param, size_t wmm_param_len) 1717 { 1718 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1719 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1720 size_t left; 1721 int count, ac; 1722 const u8 *pos; 1723 u8 uapsd_queues = 0; 1724 1725 if (!local->ops->conf_tx) 1726 return false; 1727 1728 if (local->hw.queues < IEEE80211_NUM_ACS) 1729 return false; 1730 1731 if (!wmm_param) 1732 return false; 1733 1734 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1735 return false; 1736 1737 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1738 uapsd_queues = ifmgd->uapsd_queues; 1739 1740 count = wmm_param[6] & 0x0f; 1741 if (count == ifmgd->wmm_last_param_set) 1742 return false; 1743 ifmgd->wmm_last_param_set = count; 1744 1745 pos = wmm_param + 8; 1746 left = wmm_param_len - 8; 1747 1748 memset(¶ms, 0, sizeof(params)); 1749 1750 sdata->wmm_acm = 0; 1751 for (; left >= 4; left -= 4, pos += 4) { 1752 int aci = (pos[0] >> 5) & 0x03; 1753 int acm = (pos[0] >> 4) & 0x01; 1754 bool uapsd = false; 1755 1756 switch (aci) { 1757 case 1: /* AC_BK */ 1758 ac = IEEE80211_AC_BK; 1759 if (acm) 1760 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1761 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1762 uapsd = true; 1763 break; 1764 case 2: /* AC_VI */ 1765 ac = IEEE80211_AC_VI; 1766 if (acm) 1767 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1768 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1769 uapsd = true; 1770 break; 1771 case 3: /* AC_VO */ 1772 ac = IEEE80211_AC_VO; 1773 if (acm) 1774 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1775 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1776 uapsd = true; 1777 break; 1778 case 0: /* AC_BE */ 1779 default: 1780 ac = IEEE80211_AC_BE; 1781 if (acm) 1782 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1783 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1784 uapsd = true; 1785 break; 1786 } 1787 1788 params[ac].aifs = pos[0] & 0x0f; 1789 1790 if (params[ac].aifs < 2) { 1791 sdata_info(sdata, 1792 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1793 params[ac].aifs, aci); 1794 params[ac].aifs = 2; 1795 } 1796 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1797 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1798 params[ac].txop = get_unaligned_le16(pos + 2); 1799 params[ac].acm = acm; 1800 params[ac].uapsd = uapsd; 1801 1802 if (params[ac].cw_min > params[ac].cw_max) { 1803 sdata_info(sdata, 1804 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1805 params[ac].cw_min, params[ac].cw_max, aci); 1806 return false; 1807 } 1808 } 1809 1810 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1811 mlme_dbg(sdata, 1812 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1813 ac, params[ac].acm, 1814 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1815 params[ac].txop, params[ac].uapsd, 1816 ifmgd->tx_tspec[ac].downgraded); 1817 sdata->tx_conf[ac] = params[ac]; 1818 if (!ifmgd->tx_tspec[ac].downgraded && 1819 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1820 sdata_err(sdata, 1821 "failed to set TX queue parameters for AC %d\n", 1822 ac); 1823 } 1824 1825 /* enable WMM or activate new settings */ 1826 sdata->vif.bss_conf.qos = true; 1827 return true; 1828 } 1829 1830 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1831 { 1832 lockdep_assert_held(&sdata->local->mtx); 1833 1834 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1835 ieee80211_run_deferred_scan(sdata->local); 1836 } 1837 1838 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1839 { 1840 mutex_lock(&sdata->local->mtx); 1841 __ieee80211_stop_poll(sdata); 1842 mutex_unlock(&sdata->local->mtx); 1843 } 1844 1845 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1846 u16 capab, bool erp_valid, u8 erp) 1847 { 1848 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1849 u32 changed = 0; 1850 bool use_protection; 1851 bool use_short_preamble; 1852 bool use_short_slot; 1853 1854 if (erp_valid) { 1855 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1856 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1857 } else { 1858 use_protection = false; 1859 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1860 } 1861 1862 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1863 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1864 use_short_slot = true; 1865 1866 if (use_protection != bss_conf->use_cts_prot) { 1867 bss_conf->use_cts_prot = use_protection; 1868 changed |= BSS_CHANGED_ERP_CTS_PROT; 1869 } 1870 1871 if (use_short_preamble != bss_conf->use_short_preamble) { 1872 bss_conf->use_short_preamble = use_short_preamble; 1873 changed |= BSS_CHANGED_ERP_PREAMBLE; 1874 } 1875 1876 if (use_short_slot != bss_conf->use_short_slot) { 1877 bss_conf->use_short_slot = use_short_slot; 1878 changed |= BSS_CHANGED_ERP_SLOT; 1879 } 1880 1881 return changed; 1882 } 1883 1884 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1885 struct cfg80211_bss *cbss, 1886 u32 bss_info_changed) 1887 { 1888 struct ieee80211_bss *bss = (void *)cbss->priv; 1889 struct ieee80211_local *local = sdata->local; 1890 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1891 1892 bss_info_changed |= BSS_CHANGED_ASSOC; 1893 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1894 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1895 1896 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1897 beacon_loss_count * bss_conf->beacon_int)); 1898 1899 sdata->u.mgd.associated = cbss; 1900 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1901 1902 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1903 1904 if (sdata->vif.p2p || 1905 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1906 const struct cfg80211_bss_ies *ies; 1907 1908 rcu_read_lock(); 1909 ies = rcu_dereference(cbss->ies); 1910 if (ies) { 1911 int ret; 1912 1913 ret = cfg80211_get_p2p_attr( 1914 ies->data, ies->len, 1915 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1916 (u8 *) &bss_conf->p2p_noa_attr, 1917 sizeof(bss_conf->p2p_noa_attr)); 1918 if (ret >= 2) { 1919 sdata->u.mgd.p2p_noa_index = 1920 bss_conf->p2p_noa_attr.index; 1921 bss_info_changed |= BSS_CHANGED_P2P_PS; 1922 } 1923 } 1924 rcu_read_unlock(); 1925 } 1926 1927 /* just to be sure */ 1928 ieee80211_stop_poll(sdata); 1929 1930 ieee80211_led_assoc(local, 1); 1931 1932 if (sdata->u.mgd.have_beacon) { 1933 /* 1934 * If the AP is buggy we may get here with no DTIM period 1935 * known, so assume it's 1 which is the only safe assumption 1936 * in that case, although if the TIM IE is broken powersave 1937 * probably just won't work at all. 1938 */ 1939 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1940 bss_conf->beacon_rate = bss->beacon_rate; 1941 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1942 } else { 1943 bss_conf->beacon_rate = NULL; 1944 bss_conf->dtim_period = 0; 1945 } 1946 1947 bss_conf->assoc = 1; 1948 1949 /* Tell the driver to monitor connection quality (if supported) */ 1950 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1951 bss_conf->cqm_rssi_thold) 1952 bss_info_changed |= BSS_CHANGED_CQM; 1953 1954 /* Enable ARP filtering */ 1955 if (bss_conf->arp_addr_cnt) 1956 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1957 1958 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1959 1960 mutex_lock(&local->iflist_mtx); 1961 ieee80211_recalc_ps(local); 1962 mutex_unlock(&local->iflist_mtx); 1963 1964 ieee80211_recalc_smps(sdata); 1965 ieee80211_recalc_ps_vif(sdata); 1966 1967 netif_carrier_on(sdata->dev); 1968 } 1969 1970 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1971 u16 stype, u16 reason, bool tx, 1972 u8 *frame_buf) 1973 { 1974 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1975 struct ieee80211_local *local = sdata->local; 1976 u32 changed = 0; 1977 1978 sdata_assert_lock(sdata); 1979 1980 if (WARN_ON_ONCE(tx && !frame_buf)) 1981 return; 1982 1983 if (WARN_ON(!ifmgd->associated)) 1984 return; 1985 1986 ieee80211_stop_poll(sdata); 1987 1988 ifmgd->associated = NULL; 1989 netif_carrier_off(sdata->dev); 1990 1991 /* 1992 * if we want to get out of ps before disassoc (why?) we have 1993 * to do it before sending disassoc, as otherwise the null-packet 1994 * won't be valid. 1995 */ 1996 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1997 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1998 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1999 } 2000 local->ps_sdata = NULL; 2001 2002 /* disable per-vif ps */ 2003 ieee80211_recalc_ps_vif(sdata); 2004 2005 /* make sure ongoing transmission finishes */ 2006 synchronize_net(); 2007 2008 /* 2009 * drop any frame before deauth/disassoc, this can be data or 2010 * management frame. Since we are disconnecting, we should not 2011 * insist sending these frames which can take time and delay 2012 * the disconnection and possible the roaming. 2013 */ 2014 if (tx) 2015 ieee80211_flush_queues(local, sdata, true); 2016 2017 /* deauthenticate/disassociate now */ 2018 if (tx || frame_buf) 2019 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2020 reason, tx, frame_buf); 2021 2022 /* flush out frame - make sure the deauth was actually sent */ 2023 if (tx) 2024 ieee80211_flush_queues(local, sdata, false); 2025 2026 /* clear bssid only after building the needed mgmt frames */ 2027 eth_zero_addr(ifmgd->bssid); 2028 2029 /* remove AP and TDLS peers */ 2030 sta_info_flush(sdata); 2031 2032 /* finally reset all BSS / config parameters */ 2033 changed |= ieee80211_reset_erp_info(sdata); 2034 2035 ieee80211_led_assoc(local, 0); 2036 changed |= BSS_CHANGED_ASSOC; 2037 sdata->vif.bss_conf.assoc = false; 2038 2039 ifmgd->p2p_noa_index = -1; 2040 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2041 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2042 2043 /* on the next assoc, re-program HT/VHT parameters */ 2044 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2045 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2046 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2047 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2048 2049 /* reset MU-MIMO ownership and group data */ 2050 memset(sdata->vif.bss_conf.mu_group.membership, 0, 2051 sizeof(sdata->vif.bss_conf.mu_group.membership)); 2052 memset(sdata->vif.bss_conf.mu_group.position, 0, 2053 sizeof(sdata->vif.bss_conf.mu_group.position)); 2054 changed |= BSS_CHANGED_MU_GROUPS; 2055 sdata->vif.mu_mimo_owner = false; 2056 2057 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2058 2059 del_timer_sync(&local->dynamic_ps_timer); 2060 cancel_work_sync(&local->dynamic_ps_enable_work); 2061 2062 /* Disable ARP filtering */ 2063 if (sdata->vif.bss_conf.arp_addr_cnt) 2064 changed |= BSS_CHANGED_ARP_FILTER; 2065 2066 sdata->vif.bss_conf.qos = false; 2067 changed |= BSS_CHANGED_QOS; 2068 2069 /* The BSSID (not really interesting) and HT changed */ 2070 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2071 ieee80211_bss_info_change_notify(sdata, changed); 2072 2073 /* disassociated - set to defaults now */ 2074 ieee80211_set_wmm_default(sdata, false, false); 2075 2076 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2077 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2078 del_timer_sync(&sdata->u.mgd.timer); 2079 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2080 2081 sdata->vif.bss_conf.dtim_period = 0; 2082 sdata->vif.bss_conf.beacon_rate = NULL; 2083 2084 ifmgd->have_beacon = false; 2085 2086 ifmgd->flags = 0; 2087 mutex_lock(&local->mtx); 2088 ieee80211_vif_release_channel(sdata); 2089 2090 sdata->vif.csa_active = false; 2091 ifmgd->csa_waiting_bcn = false; 2092 ifmgd->csa_ignored_same_chan = false; 2093 if (sdata->csa_block_tx) { 2094 ieee80211_wake_vif_queues(local, sdata, 2095 IEEE80211_QUEUE_STOP_REASON_CSA); 2096 sdata->csa_block_tx = false; 2097 } 2098 mutex_unlock(&local->mtx); 2099 2100 /* existing TX TSPEC sessions no longer exist */ 2101 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2102 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2103 2104 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2105 } 2106 2107 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2108 struct ieee80211_hdr *hdr) 2109 { 2110 /* 2111 * We can postpone the mgd.timer whenever receiving unicast frames 2112 * from AP because we know that the connection is working both ways 2113 * at that time. But multicast frames (and hence also beacons) must 2114 * be ignored here, because we need to trigger the timer during 2115 * data idle periods for sending the periodic probe request to the 2116 * AP we're connected to. 2117 */ 2118 if (is_multicast_ether_addr(hdr->addr1)) 2119 return; 2120 2121 ieee80211_sta_reset_conn_monitor(sdata); 2122 } 2123 2124 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2125 { 2126 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2127 struct ieee80211_local *local = sdata->local; 2128 2129 mutex_lock(&local->mtx); 2130 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2131 goto out; 2132 2133 __ieee80211_stop_poll(sdata); 2134 2135 mutex_lock(&local->iflist_mtx); 2136 ieee80211_recalc_ps(local); 2137 mutex_unlock(&local->iflist_mtx); 2138 2139 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2140 goto out; 2141 2142 /* 2143 * We've received a probe response, but are not sure whether 2144 * we have or will be receiving any beacons or data, so let's 2145 * schedule the timers again, just in case. 2146 */ 2147 ieee80211_sta_reset_beacon_monitor(sdata); 2148 2149 mod_timer(&ifmgd->conn_mon_timer, 2150 round_jiffies_up(jiffies + 2151 IEEE80211_CONNECTION_IDLE_TIME)); 2152 out: 2153 mutex_unlock(&local->mtx); 2154 } 2155 2156 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2157 struct ieee80211_hdr *hdr, 2158 u16 tx_time) 2159 { 2160 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2161 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2162 int ac = ieee80211_ac_from_tid(tid); 2163 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2164 unsigned long now = jiffies; 2165 2166 if (likely(!tx_tspec->admitted_time)) 2167 return; 2168 2169 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2170 tx_tspec->consumed_tx_time = 0; 2171 tx_tspec->time_slice_start = now; 2172 2173 if (tx_tspec->downgraded) { 2174 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2175 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2176 } 2177 } 2178 2179 if (tx_tspec->downgraded) 2180 return; 2181 2182 tx_tspec->consumed_tx_time += tx_time; 2183 2184 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2185 tx_tspec->downgraded = true; 2186 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2187 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2188 } 2189 } 2190 2191 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2192 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2193 { 2194 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2195 2196 if (!ieee80211_is_data(hdr->frame_control)) 2197 return; 2198 2199 if (ieee80211_is_nullfunc(hdr->frame_control) && 2200 sdata->u.mgd.probe_send_count > 0) { 2201 if (ack) 2202 ieee80211_sta_reset_conn_monitor(sdata); 2203 else 2204 sdata->u.mgd.nullfunc_failed = true; 2205 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2206 return; 2207 } 2208 2209 if (ack) 2210 ieee80211_sta_reset_conn_monitor(sdata); 2211 } 2212 2213 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2214 { 2215 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2216 const u8 *ssid; 2217 u8 *dst = ifmgd->associated->bssid; 2218 u8 unicast_limit = max(1, max_probe_tries - 3); 2219 2220 /* 2221 * Try sending broadcast probe requests for the last three 2222 * probe requests after the first ones failed since some 2223 * buggy APs only support broadcast probe requests. 2224 */ 2225 if (ifmgd->probe_send_count >= unicast_limit) 2226 dst = NULL; 2227 2228 /* 2229 * When the hardware reports an accurate Tx ACK status, it's 2230 * better to send a nullfunc frame instead of a probe request, 2231 * as it will kick us off the AP quickly if we aren't associated 2232 * anymore. The timeout will be reset if the frame is ACKed by 2233 * the AP. 2234 */ 2235 ifmgd->probe_send_count++; 2236 2237 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2238 ifmgd->nullfunc_failed = false; 2239 ieee80211_send_nullfunc(sdata->local, sdata, false); 2240 } else { 2241 int ssid_len; 2242 2243 rcu_read_lock(); 2244 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2245 if (WARN_ON_ONCE(ssid == NULL)) 2246 ssid_len = 0; 2247 else 2248 ssid_len = ssid[1]; 2249 2250 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2251 ssid + 2, ssid_len, NULL, 2252 0, (u32) -1, true, 0, 2253 ifmgd->associated->channel, false); 2254 rcu_read_unlock(); 2255 } 2256 2257 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2258 run_again(sdata, ifmgd->probe_timeout); 2259 } 2260 2261 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2262 bool beacon) 2263 { 2264 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2265 bool already = false; 2266 2267 if (!ieee80211_sdata_running(sdata)) 2268 return; 2269 2270 sdata_lock(sdata); 2271 2272 if (!ifmgd->associated) 2273 goto out; 2274 2275 mutex_lock(&sdata->local->mtx); 2276 2277 if (sdata->local->tmp_channel || sdata->local->scanning) { 2278 mutex_unlock(&sdata->local->mtx); 2279 goto out; 2280 } 2281 2282 if (beacon) { 2283 mlme_dbg_ratelimited(sdata, 2284 "detected beacon loss from AP (missed %d beacons) - probing\n", 2285 beacon_loss_count); 2286 2287 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2288 } 2289 2290 /* 2291 * The driver/our work has already reported this event or the 2292 * connection monitoring has kicked in and we have already sent 2293 * a probe request. Or maybe the AP died and the driver keeps 2294 * reporting until we disassociate... 2295 * 2296 * In either case we have to ignore the current call to this 2297 * function (except for setting the correct probe reason bit) 2298 * because otherwise we would reset the timer every time and 2299 * never check whether we received a probe response! 2300 */ 2301 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2302 already = true; 2303 2304 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2305 2306 mutex_unlock(&sdata->local->mtx); 2307 2308 if (already) 2309 goto out; 2310 2311 mutex_lock(&sdata->local->iflist_mtx); 2312 ieee80211_recalc_ps(sdata->local); 2313 mutex_unlock(&sdata->local->iflist_mtx); 2314 2315 ifmgd->probe_send_count = 0; 2316 ieee80211_mgd_probe_ap_send(sdata); 2317 out: 2318 sdata_unlock(sdata); 2319 } 2320 2321 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2322 struct ieee80211_vif *vif) 2323 { 2324 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2325 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2326 struct cfg80211_bss *cbss; 2327 struct sk_buff *skb; 2328 const u8 *ssid; 2329 int ssid_len; 2330 2331 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2332 return NULL; 2333 2334 sdata_assert_lock(sdata); 2335 2336 if (ifmgd->associated) 2337 cbss = ifmgd->associated; 2338 else if (ifmgd->auth_data) 2339 cbss = ifmgd->auth_data->bss; 2340 else if (ifmgd->assoc_data) 2341 cbss = ifmgd->assoc_data->bss; 2342 else 2343 return NULL; 2344 2345 rcu_read_lock(); 2346 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2347 if (WARN_ON_ONCE(ssid == NULL)) 2348 ssid_len = 0; 2349 else 2350 ssid_len = ssid[1]; 2351 2352 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2353 (u32) -1, cbss->channel, 2354 ssid + 2, ssid_len, 2355 NULL, 0, true); 2356 rcu_read_unlock(); 2357 2358 return skb; 2359 } 2360 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2361 2362 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2363 const u8 *buf, size_t len, bool tx, 2364 u16 reason) 2365 { 2366 struct ieee80211_event event = { 2367 .type = MLME_EVENT, 2368 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2369 .u.mlme.reason = reason, 2370 }; 2371 2372 if (tx) 2373 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2374 else 2375 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2376 2377 drv_event_callback(sdata->local, sdata, &event); 2378 } 2379 2380 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2381 { 2382 struct ieee80211_local *local = sdata->local; 2383 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2384 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2385 2386 sdata_lock(sdata); 2387 if (!ifmgd->associated) { 2388 sdata_unlock(sdata); 2389 return; 2390 } 2391 2392 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2393 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2394 true, frame_buf); 2395 mutex_lock(&local->mtx); 2396 sdata->vif.csa_active = false; 2397 ifmgd->csa_waiting_bcn = false; 2398 if (sdata->csa_block_tx) { 2399 ieee80211_wake_vif_queues(local, sdata, 2400 IEEE80211_QUEUE_STOP_REASON_CSA); 2401 sdata->csa_block_tx = false; 2402 } 2403 mutex_unlock(&local->mtx); 2404 2405 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2406 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2407 2408 sdata_unlock(sdata); 2409 } 2410 2411 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2412 { 2413 struct ieee80211_sub_if_data *sdata = 2414 container_of(work, struct ieee80211_sub_if_data, 2415 u.mgd.beacon_connection_loss_work); 2416 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2417 2418 if (ifmgd->associated) 2419 ifmgd->beacon_loss_count++; 2420 2421 if (ifmgd->connection_loss) { 2422 sdata_info(sdata, "Connection to AP %pM lost\n", 2423 ifmgd->bssid); 2424 __ieee80211_disconnect(sdata); 2425 } else { 2426 ieee80211_mgd_probe_ap(sdata, true); 2427 } 2428 } 2429 2430 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2431 { 2432 struct ieee80211_sub_if_data *sdata = 2433 container_of(work, struct ieee80211_sub_if_data, 2434 u.mgd.csa_connection_drop_work); 2435 2436 __ieee80211_disconnect(sdata); 2437 } 2438 2439 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2440 { 2441 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2442 struct ieee80211_hw *hw = &sdata->local->hw; 2443 2444 trace_api_beacon_loss(sdata); 2445 2446 sdata->u.mgd.connection_loss = false; 2447 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2448 } 2449 EXPORT_SYMBOL(ieee80211_beacon_loss); 2450 2451 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2452 { 2453 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2454 struct ieee80211_hw *hw = &sdata->local->hw; 2455 2456 trace_api_connection_loss(sdata); 2457 2458 sdata->u.mgd.connection_loss = true; 2459 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2460 } 2461 EXPORT_SYMBOL(ieee80211_connection_loss); 2462 2463 2464 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2465 bool assoc) 2466 { 2467 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2468 2469 sdata_assert_lock(sdata); 2470 2471 if (!assoc) { 2472 /* 2473 * we are not authenticated yet, the only timer that could be 2474 * running is the timeout for the authentication response which 2475 * which is not relevant anymore. 2476 */ 2477 del_timer_sync(&sdata->u.mgd.timer); 2478 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2479 2480 eth_zero_addr(sdata->u.mgd.bssid); 2481 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2482 sdata->u.mgd.flags = 0; 2483 mutex_lock(&sdata->local->mtx); 2484 ieee80211_vif_release_channel(sdata); 2485 mutex_unlock(&sdata->local->mtx); 2486 } 2487 2488 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2489 kfree(auth_data); 2490 sdata->u.mgd.auth_data = NULL; 2491 } 2492 2493 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2494 bool assoc) 2495 { 2496 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2497 2498 sdata_assert_lock(sdata); 2499 2500 if (!assoc) { 2501 /* 2502 * we are not associated yet, the only timer that could be 2503 * running is the timeout for the association response which 2504 * which is not relevant anymore. 2505 */ 2506 del_timer_sync(&sdata->u.mgd.timer); 2507 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2508 2509 eth_zero_addr(sdata->u.mgd.bssid); 2510 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2511 sdata->u.mgd.flags = 0; 2512 sdata->vif.mu_mimo_owner = false; 2513 2514 mutex_lock(&sdata->local->mtx); 2515 ieee80211_vif_release_channel(sdata); 2516 mutex_unlock(&sdata->local->mtx); 2517 } 2518 2519 kfree(assoc_data); 2520 sdata->u.mgd.assoc_data = NULL; 2521 } 2522 2523 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2524 struct ieee80211_mgmt *mgmt, size_t len) 2525 { 2526 struct ieee80211_local *local = sdata->local; 2527 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2528 u8 *pos; 2529 struct ieee802_11_elems elems; 2530 u32 tx_flags = 0; 2531 2532 pos = mgmt->u.auth.variable; 2533 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2534 if (!elems.challenge) 2535 return; 2536 auth_data->expected_transaction = 4; 2537 drv_mgd_prepare_tx(sdata->local, sdata); 2538 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2539 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2540 IEEE80211_TX_INTFL_MLME_CONN_TX; 2541 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2542 elems.challenge - 2, elems.challenge_len + 2, 2543 auth_data->bss->bssid, auth_data->bss->bssid, 2544 auth_data->key, auth_data->key_len, 2545 auth_data->key_idx, tx_flags); 2546 } 2547 2548 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2549 struct ieee80211_mgmt *mgmt, size_t len) 2550 { 2551 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2552 u8 bssid[ETH_ALEN]; 2553 u16 auth_alg, auth_transaction, status_code; 2554 struct sta_info *sta; 2555 struct ieee80211_event event = { 2556 .type = MLME_EVENT, 2557 .u.mlme.data = AUTH_EVENT, 2558 }; 2559 2560 sdata_assert_lock(sdata); 2561 2562 if (len < 24 + 6) 2563 return; 2564 2565 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2566 return; 2567 2568 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2569 2570 if (!ether_addr_equal(bssid, mgmt->bssid)) 2571 return; 2572 2573 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2574 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2575 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2576 2577 if (auth_alg != ifmgd->auth_data->algorithm || 2578 auth_transaction != ifmgd->auth_data->expected_transaction) { 2579 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2580 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2581 auth_transaction, 2582 ifmgd->auth_data->expected_transaction); 2583 return; 2584 } 2585 2586 if (status_code != WLAN_STATUS_SUCCESS) { 2587 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2588 mgmt->sa, status_code); 2589 ieee80211_destroy_auth_data(sdata, false); 2590 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2591 event.u.mlme.status = MLME_DENIED; 2592 event.u.mlme.reason = status_code; 2593 drv_event_callback(sdata->local, sdata, &event); 2594 return; 2595 } 2596 2597 switch (ifmgd->auth_data->algorithm) { 2598 case WLAN_AUTH_OPEN: 2599 case WLAN_AUTH_LEAP: 2600 case WLAN_AUTH_FT: 2601 case WLAN_AUTH_SAE: 2602 break; 2603 case WLAN_AUTH_SHARED_KEY: 2604 if (ifmgd->auth_data->expected_transaction != 4) { 2605 ieee80211_auth_challenge(sdata, mgmt, len); 2606 /* need another frame */ 2607 return; 2608 } 2609 break; 2610 default: 2611 WARN_ONCE(1, "invalid auth alg %d", 2612 ifmgd->auth_data->algorithm); 2613 return; 2614 } 2615 2616 event.u.mlme.status = MLME_SUCCESS; 2617 drv_event_callback(sdata->local, sdata, &event); 2618 sdata_info(sdata, "authenticated\n"); 2619 ifmgd->auth_data->done = true; 2620 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2621 ifmgd->auth_data->timeout_started = true; 2622 run_again(sdata, ifmgd->auth_data->timeout); 2623 2624 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2625 ifmgd->auth_data->expected_transaction != 2) { 2626 /* 2627 * Report auth frame to user space for processing since another 2628 * round of Authentication frames is still needed. 2629 */ 2630 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2631 return; 2632 } 2633 2634 /* move station state to auth */ 2635 mutex_lock(&sdata->local->sta_mtx); 2636 sta = sta_info_get(sdata, bssid); 2637 if (!sta) { 2638 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2639 goto out_err; 2640 } 2641 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2642 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2643 goto out_err; 2644 } 2645 mutex_unlock(&sdata->local->sta_mtx); 2646 2647 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2648 return; 2649 out_err: 2650 mutex_unlock(&sdata->local->sta_mtx); 2651 /* ignore frame -- wait for timeout */ 2652 } 2653 2654 #define case_WLAN(type) \ 2655 case WLAN_REASON_##type: return #type 2656 2657 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2658 { 2659 switch (reason_code) { 2660 case_WLAN(UNSPECIFIED); 2661 case_WLAN(PREV_AUTH_NOT_VALID); 2662 case_WLAN(DEAUTH_LEAVING); 2663 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2664 case_WLAN(DISASSOC_AP_BUSY); 2665 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2666 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2667 case_WLAN(DISASSOC_STA_HAS_LEFT); 2668 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2669 case_WLAN(DISASSOC_BAD_POWER); 2670 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2671 case_WLAN(INVALID_IE); 2672 case_WLAN(MIC_FAILURE); 2673 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2674 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2675 case_WLAN(IE_DIFFERENT); 2676 case_WLAN(INVALID_GROUP_CIPHER); 2677 case_WLAN(INVALID_PAIRWISE_CIPHER); 2678 case_WLAN(INVALID_AKMP); 2679 case_WLAN(UNSUPP_RSN_VERSION); 2680 case_WLAN(INVALID_RSN_IE_CAP); 2681 case_WLAN(IEEE8021X_FAILED); 2682 case_WLAN(CIPHER_SUITE_REJECTED); 2683 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2684 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2685 case_WLAN(DISASSOC_LOW_ACK); 2686 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2687 case_WLAN(QSTA_LEAVE_QBSS); 2688 case_WLAN(QSTA_NOT_USE); 2689 case_WLAN(QSTA_REQUIRE_SETUP); 2690 case_WLAN(QSTA_TIMEOUT); 2691 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2692 case_WLAN(MESH_PEER_CANCELED); 2693 case_WLAN(MESH_MAX_PEERS); 2694 case_WLAN(MESH_CONFIG); 2695 case_WLAN(MESH_CLOSE); 2696 case_WLAN(MESH_MAX_RETRIES); 2697 case_WLAN(MESH_CONFIRM_TIMEOUT); 2698 case_WLAN(MESH_INVALID_GTK); 2699 case_WLAN(MESH_INCONSISTENT_PARAM); 2700 case_WLAN(MESH_INVALID_SECURITY); 2701 case_WLAN(MESH_PATH_ERROR); 2702 case_WLAN(MESH_PATH_NOFORWARD); 2703 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2704 case_WLAN(MAC_EXISTS_IN_MBSS); 2705 case_WLAN(MESH_CHAN_REGULATORY); 2706 case_WLAN(MESH_CHAN); 2707 default: return "<unknown>"; 2708 } 2709 } 2710 2711 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2712 struct ieee80211_mgmt *mgmt, size_t len) 2713 { 2714 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2715 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2716 2717 sdata_assert_lock(sdata); 2718 2719 if (len < 24 + 2) 2720 return; 2721 2722 if (ifmgd->associated && 2723 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2724 const u8 *bssid = ifmgd->associated->bssid; 2725 2726 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2727 bssid, reason_code, 2728 ieee80211_get_reason_code_string(reason_code)); 2729 2730 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2731 2732 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2733 reason_code); 2734 return; 2735 } 2736 2737 if (ifmgd->assoc_data && 2738 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2739 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2740 2741 sdata_info(sdata, 2742 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2743 bssid, reason_code, 2744 ieee80211_get_reason_code_string(reason_code)); 2745 2746 ieee80211_destroy_assoc_data(sdata, false); 2747 2748 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2749 return; 2750 } 2751 } 2752 2753 2754 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2755 struct ieee80211_mgmt *mgmt, size_t len) 2756 { 2757 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2758 u16 reason_code; 2759 2760 sdata_assert_lock(sdata); 2761 2762 if (len < 24 + 2) 2763 return; 2764 2765 if (!ifmgd->associated || 2766 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2767 return; 2768 2769 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2770 2771 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2772 mgmt->sa, reason_code); 2773 2774 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2775 2776 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2777 } 2778 2779 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2780 u8 *supp_rates, unsigned int supp_rates_len, 2781 u32 *rates, u32 *basic_rates, 2782 bool *have_higher_than_11mbit, 2783 int *min_rate, int *min_rate_index, 2784 int shift, u32 rate_flags) 2785 { 2786 int i, j; 2787 2788 for (i = 0; i < supp_rates_len; i++) { 2789 int rate = supp_rates[i] & 0x7f; 2790 bool is_basic = !!(supp_rates[i] & 0x80); 2791 2792 if ((rate * 5 * (1 << shift)) > 110) 2793 *have_higher_than_11mbit = true; 2794 2795 /* 2796 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2797 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2798 * 2799 * Note: Even through the membership selector and the basic 2800 * rate flag share the same bit, they are not exactly 2801 * the same. 2802 */ 2803 if (!!(supp_rates[i] & 0x80) && 2804 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2805 continue; 2806 2807 for (j = 0; j < sband->n_bitrates; j++) { 2808 struct ieee80211_rate *br; 2809 int brate; 2810 2811 br = &sband->bitrates[j]; 2812 if ((rate_flags & br->flags) != rate_flags) 2813 continue; 2814 2815 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2816 if (brate == rate) { 2817 *rates |= BIT(j); 2818 if (is_basic) 2819 *basic_rates |= BIT(j); 2820 if ((rate * 5) < *min_rate) { 2821 *min_rate = rate * 5; 2822 *min_rate_index = j; 2823 } 2824 break; 2825 } 2826 } 2827 } 2828 } 2829 2830 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2831 struct cfg80211_bss *cbss, 2832 struct ieee80211_mgmt *mgmt, size_t len) 2833 { 2834 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2835 struct ieee80211_local *local = sdata->local; 2836 struct ieee80211_supported_band *sband; 2837 struct sta_info *sta; 2838 u8 *pos; 2839 u16 capab_info, aid; 2840 struct ieee802_11_elems elems; 2841 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2842 const struct cfg80211_bss_ies *bss_ies = NULL; 2843 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2844 u32 changed = 0; 2845 int err; 2846 bool ret; 2847 2848 /* AssocResp and ReassocResp have identical structure */ 2849 2850 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2851 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2852 2853 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2854 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2855 aid); 2856 aid &= ~(BIT(15) | BIT(14)); 2857 2858 ifmgd->broken_ap = false; 2859 2860 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2861 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2862 aid); 2863 aid = 0; 2864 ifmgd->broken_ap = true; 2865 } 2866 2867 pos = mgmt->u.assoc_resp.variable; 2868 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2869 2870 if (!elems.supp_rates) { 2871 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2872 return false; 2873 } 2874 2875 ifmgd->aid = aid; 2876 ifmgd->tdls_chan_switch_prohibited = 2877 elems.ext_capab && elems.ext_capab_len >= 5 && 2878 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2879 2880 /* 2881 * Some APs are erroneously not including some information in their 2882 * (re)association response frames. Try to recover by using the data 2883 * from the beacon or probe response. This seems to afflict mobile 2884 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2885 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2886 */ 2887 if ((assoc_data->wmm && !elems.wmm_param) || 2888 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2889 (!elems.ht_cap_elem || !elems.ht_operation)) || 2890 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2891 (!elems.vht_cap_elem || !elems.vht_operation))) { 2892 const struct cfg80211_bss_ies *ies; 2893 struct ieee802_11_elems bss_elems; 2894 2895 rcu_read_lock(); 2896 ies = rcu_dereference(cbss->ies); 2897 if (ies) 2898 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2899 GFP_ATOMIC); 2900 rcu_read_unlock(); 2901 if (!bss_ies) 2902 return false; 2903 2904 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2905 false, &bss_elems); 2906 if (assoc_data->wmm && 2907 !elems.wmm_param && bss_elems.wmm_param) { 2908 elems.wmm_param = bss_elems.wmm_param; 2909 sdata_info(sdata, 2910 "AP bug: WMM param missing from AssocResp\n"); 2911 } 2912 2913 /* 2914 * Also check if we requested HT/VHT, otherwise the AP doesn't 2915 * have to include the IEs in the (re)association response. 2916 */ 2917 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2918 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2919 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2920 sdata_info(sdata, 2921 "AP bug: HT capability missing from AssocResp\n"); 2922 } 2923 if (!elems.ht_operation && bss_elems.ht_operation && 2924 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2925 elems.ht_operation = bss_elems.ht_operation; 2926 sdata_info(sdata, 2927 "AP bug: HT operation missing from AssocResp\n"); 2928 } 2929 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2930 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2931 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2932 sdata_info(sdata, 2933 "AP bug: VHT capa missing from AssocResp\n"); 2934 } 2935 if (!elems.vht_operation && bss_elems.vht_operation && 2936 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2937 elems.vht_operation = bss_elems.vht_operation; 2938 sdata_info(sdata, 2939 "AP bug: VHT operation missing from AssocResp\n"); 2940 } 2941 } 2942 2943 /* 2944 * We previously checked these in the beacon/probe response, so 2945 * they should be present here. This is just a safety net. 2946 */ 2947 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2948 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2949 sdata_info(sdata, 2950 "HT AP is missing WMM params or HT capability/operation\n"); 2951 ret = false; 2952 goto out; 2953 } 2954 2955 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2956 (!elems.vht_cap_elem || !elems.vht_operation)) { 2957 sdata_info(sdata, 2958 "VHT AP is missing VHT capability/operation\n"); 2959 ret = false; 2960 goto out; 2961 } 2962 2963 mutex_lock(&sdata->local->sta_mtx); 2964 /* 2965 * station info was already allocated and inserted before 2966 * the association and should be available to us 2967 */ 2968 sta = sta_info_get(sdata, cbss->bssid); 2969 if (WARN_ON(!sta)) { 2970 mutex_unlock(&sdata->local->sta_mtx); 2971 ret = false; 2972 goto out; 2973 } 2974 2975 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2976 2977 /* Set up internal HT/VHT capabilities */ 2978 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2979 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2980 elems.ht_cap_elem, sta); 2981 2982 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 2983 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 2984 elems.vht_cap_elem, sta); 2985 2986 /* 2987 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 2988 * in their association response, so ignore that data for our own 2989 * configuration. If it changed since the last beacon, we'll get the 2990 * next beacon and update then. 2991 */ 2992 2993 /* 2994 * If an operating mode notification IE is present, override the 2995 * NSS calculation (that would be done in rate_control_rate_init()) 2996 * and use the # of streams from that element. 2997 */ 2998 if (elems.opmode_notif && 2999 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3000 u8 nss; 3001 3002 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3003 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3004 nss += 1; 3005 sta->sta.rx_nss = nss; 3006 } 3007 3008 rate_control_rate_init(sta); 3009 3010 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3011 set_sta_flag(sta, WLAN_STA_MFP); 3012 sta->sta.mfp = true; 3013 } else { 3014 sta->sta.mfp = false; 3015 } 3016 3017 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3018 3019 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3020 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3021 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3022 if (err) { 3023 sdata_info(sdata, 3024 "failed to move station %pM to desired state\n", 3025 sta->sta.addr); 3026 WARN_ON(__sta_info_destroy(sta)); 3027 mutex_unlock(&sdata->local->sta_mtx); 3028 ret = false; 3029 goto out; 3030 } 3031 3032 mutex_unlock(&sdata->local->sta_mtx); 3033 3034 /* 3035 * Always handle WMM once after association regardless 3036 * of the first value the AP uses. Setting -1 here has 3037 * that effect because the AP values is an unsigned 3038 * 4-bit value. 3039 */ 3040 ifmgd->wmm_last_param_set = -1; 3041 3042 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3043 ieee80211_set_wmm_default(sdata, false, false); 3044 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3045 elems.wmm_param_len)) { 3046 /* still enable QoS since we might have HT/VHT */ 3047 ieee80211_set_wmm_default(sdata, false, true); 3048 /* set the disable-WMM flag in this case to disable 3049 * tracking WMM parameter changes in the beacon if 3050 * the parameters weren't actually valid. Doing so 3051 * avoids changing parameters very strangely when 3052 * the AP is going back and forth between valid and 3053 * invalid parameters. 3054 */ 3055 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3056 } 3057 changed |= BSS_CHANGED_QOS; 3058 3059 /* set AID and assoc capability, 3060 * ieee80211_set_associated() will tell the driver */ 3061 bss_conf->aid = aid; 3062 bss_conf->assoc_capability = capab_info; 3063 ieee80211_set_associated(sdata, cbss, changed); 3064 3065 /* 3066 * If we're using 4-addr mode, let the AP know that we're 3067 * doing so, so that it can create the STA VLAN on its side 3068 */ 3069 if (ifmgd->use_4addr) 3070 ieee80211_send_4addr_nullfunc(local, sdata); 3071 3072 /* 3073 * Start timer to probe the connection to the AP now. 3074 * Also start the timer that will detect beacon loss. 3075 */ 3076 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3077 ieee80211_sta_reset_beacon_monitor(sdata); 3078 3079 ret = true; 3080 out: 3081 kfree(bss_ies); 3082 return ret; 3083 } 3084 3085 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3086 struct ieee80211_mgmt *mgmt, 3087 size_t len) 3088 { 3089 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3090 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3091 u16 capab_info, status_code, aid; 3092 struct ieee802_11_elems elems; 3093 int ac, uapsd_queues = -1; 3094 u8 *pos; 3095 bool reassoc; 3096 struct cfg80211_bss *bss; 3097 struct ieee80211_event event = { 3098 .type = MLME_EVENT, 3099 .u.mlme.data = ASSOC_EVENT, 3100 }; 3101 3102 sdata_assert_lock(sdata); 3103 3104 if (!assoc_data) 3105 return; 3106 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3107 return; 3108 3109 /* 3110 * AssocResp and ReassocResp have identical structure, so process both 3111 * of them in this function. 3112 */ 3113 3114 if (len < 24 + 6) 3115 return; 3116 3117 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3118 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3119 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3120 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3121 3122 sdata_info(sdata, 3123 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3124 reassoc ? "Rea" : "A", mgmt->sa, 3125 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3126 3127 pos = mgmt->u.assoc_resp.variable; 3128 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3129 3130 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3131 elems.timeout_int && 3132 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3133 u32 tu, ms; 3134 tu = le32_to_cpu(elems.timeout_int->value); 3135 ms = tu * 1024 / 1000; 3136 sdata_info(sdata, 3137 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3138 mgmt->sa, tu, ms); 3139 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3140 assoc_data->timeout_started = true; 3141 if (ms > IEEE80211_ASSOC_TIMEOUT) 3142 run_again(sdata, assoc_data->timeout); 3143 return; 3144 } 3145 3146 bss = assoc_data->bss; 3147 3148 if (status_code != WLAN_STATUS_SUCCESS) { 3149 sdata_info(sdata, "%pM denied association (code=%d)\n", 3150 mgmt->sa, status_code); 3151 ieee80211_destroy_assoc_data(sdata, false); 3152 event.u.mlme.status = MLME_DENIED; 3153 event.u.mlme.reason = status_code; 3154 drv_event_callback(sdata->local, sdata, &event); 3155 } else { 3156 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3157 /* oops -- internal error -- send timeout for now */ 3158 ieee80211_destroy_assoc_data(sdata, false); 3159 cfg80211_assoc_timeout(sdata->dev, bss); 3160 return; 3161 } 3162 event.u.mlme.status = MLME_SUCCESS; 3163 drv_event_callback(sdata->local, sdata, &event); 3164 sdata_info(sdata, "associated\n"); 3165 3166 /* 3167 * destroy assoc_data afterwards, as otherwise an idle 3168 * recalc after assoc_data is NULL but before associated 3169 * is set can cause the interface to go idle 3170 */ 3171 ieee80211_destroy_assoc_data(sdata, true); 3172 3173 /* get uapsd queues configuration */ 3174 uapsd_queues = 0; 3175 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3176 if (sdata->tx_conf[ac].uapsd) 3177 uapsd_queues |= BIT(ac); 3178 } 3179 3180 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3181 } 3182 3183 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3184 struct ieee80211_mgmt *mgmt, size_t len, 3185 struct ieee80211_rx_status *rx_status, 3186 struct ieee802_11_elems *elems) 3187 { 3188 struct ieee80211_local *local = sdata->local; 3189 struct ieee80211_bss *bss; 3190 struct ieee80211_channel *channel; 3191 3192 sdata_assert_lock(sdata); 3193 3194 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3195 if (!channel) 3196 return; 3197 3198 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3199 channel); 3200 if (bss) { 3201 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3202 ieee80211_rx_bss_put(local, bss); 3203 } 3204 } 3205 3206 3207 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3208 struct sk_buff *skb) 3209 { 3210 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3211 struct ieee80211_if_managed *ifmgd; 3212 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3213 size_t baselen, len = skb->len; 3214 struct ieee802_11_elems elems; 3215 3216 ifmgd = &sdata->u.mgd; 3217 3218 sdata_assert_lock(sdata); 3219 3220 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3221 return; /* ignore ProbeResp to foreign address */ 3222 3223 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3224 if (baselen > len) 3225 return; 3226 3227 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3228 false, &elems); 3229 3230 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3231 3232 if (ifmgd->associated && 3233 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3234 ieee80211_reset_ap_probe(sdata); 3235 } 3236 3237 /* 3238 * This is the canonical list of information elements we care about, 3239 * the filter code also gives us all changes to the Microsoft OUI 3240 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3241 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3242 * changes to requested client power. 3243 * 3244 * We implement beacon filtering in software since that means we can 3245 * avoid processing the frame here and in cfg80211, and userspace 3246 * will not be able to tell whether the hardware supports it or not. 3247 * 3248 * XXX: This list needs to be dynamic -- userspace needs to be able to 3249 * add items it requires. It also needs to be able to tell us to 3250 * look out for other vendor IEs. 3251 */ 3252 static const u64 care_about_ies = 3253 (1ULL << WLAN_EID_COUNTRY) | 3254 (1ULL << WLAN_EID_ERP_INFO) | 3255 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3256 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3257 (1ULL << WLAN_EID_HT_CAPABILITY) | 3258 (1ULL << WLAN_EID_HT_OPERATION) | 3259 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3260 3261 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3262 struct ieee80211_mgmt *mgmt, size_t len, 3263 struct ieee80211_rx_status *rx_status) 3264 { 3265 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3266 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3267 size_t baselen; 3268 struct ieee802_11_elems elems; 3269 struct ieee80211_local *local = sdata->local; 3270 struct ieee80211_chanctx_conf *chanctx_conf; 3271 struct ieee80211_channel *chan; 3272 struct sta_info *sta; 3273 u32 changed = 0; 3274 bool erp_valid; 3275 u8 erp_value = 0; 3276 u32 ncrc; 3277 u8 *bssid; 3278 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3279 3280 sdata_assert_lock(sdata); 3281 3282 /* Process beacon from the current BSS */ 3283 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3284 if (baselen > len) 3285 return; 3286 3287 rcu_read_lock(); 3288 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3289 if (!chanctx_conf) { 3290 rcu_read_unlock(); 3291 return; 3292 } 3293 3294 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3295 rcu_read_unlock(); 3296 return; 3297 } 3298 chan = chanctx_conf->def.chan; 3299 rcu_read_unlock(); 3300 3301 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3302 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3303 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3304 len - baselen, false, &elems); 3305 3306 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3307 if (elems.tim && !elems.parse_error) { 3308 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3309 ifmgd->dtim_period = tim_ie->dtim_period; 3310 } 3311 ifmgd->have_beacon = true; 3312 ifmgd->assoc_data->need_beacon = false; 3313 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3314 sdata->vif.bss_conf.sync_tsf = 3315 le64_to_cpu(mgmt->u.beacon.timestamp); 3316 sdata->vif.bss_conf.sync_device_ts = 3317 rx_status->device_timestamp; 3318 if (elems.tim) 3319 sdata->vif.bss_conf.sync_dtim_count = 3320 elems.tim->dtim_count; 3321 else 3322 sdata->vif.bss_conf.sync_dtim_count = 0; 3323 } 3324 /* continue assoc process */ 3325 ifmgd->assoc_data->timeout = jiffies; 3326 ifmgd->assoc_data->timeout_started = true; 3327 run_again(sdata, ifmgd->assoc_data->timeout); 3328 return; 3329 } 3330 3331 if (!ifmgd->associated || 3332 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3333 return; 3334 bssid = ifmgd->associated->bssid; 3335 3336 /* Track average RSSI from the Beacon frames of the current AP */ 3337 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3338 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3339 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3340 ifmgd->last_cqm_event_signal = 0; 3341 ifmgd->count_beacon_signal = 1; 3342 ifmgd->last_ave_beacon_signal = 0; 3343 } else { 3344 ifmgd->count_beacon_signal++; 3345 } 3346 3347 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3348 3349 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3350 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3351 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3352 int last_sig = ifmgd->last_ave_beacon_signal; 3353 struct ieee80211_event event = { 3354 .type = RSSI_EVENT, 3355 }; 3356 3357 /* 3358 * if signal crosses either of the boundaries, invoke callback 3359 * with appropriate parameters 3360 */ 3361 if (sig > ifmgd->rssi_max_thold && 3362 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3363 ifmgd->last_ave_beacon_signal = sig; 3364 event.u.rssi.data = RSSI_EVENT_HIGH; 3365 drv_event_callback(local, sdata, &event); 3366 } else if (sig < ifmgd->rssi_min_thold && 3367 (last_sig >= ifmgd->rssi_max_thold || 3368 last_sig == 0)) { 3369 ifmgd->last_ave_beacon_signal = sig; 3370 event.u.rssi.data = RSSI_EVENT_LOW; 3371 drv_event_callback(local, sdata, &event); 3372 } 3373 } 3374 3375 if (bss_conf->cqm_rssi_thold && 3376 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3377 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3378 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3379 int last_event = ifmgd->last_cqm_event_signal; 3380 int thold = bss_conf->cqm_rssi_thold; 3381 int hyst = bss_conf->cqm_rssi_hyst; 3382 3383 if (sig < thold && 3384 (last_event == 0 || sig < last_event - hyst)) { 3385 ifmgd->last_cqm_event_signal = sig; 3386 ieee80211_cqm_rssi_notify( 3387 &sdata->vif, 3388 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3389 GFP_KERNEL); 3390 } else if (sig > thold && 3391 (last_event == 0 || sig > last_event + hyst)) { 3392 ifmgd->last_cqm_event_signal = sig; 3393 ieee80211_cqm_rssi_notify( 3394 &sdata->vif, 3395 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3396 GFP_KERNEL); 3397 } 3398 } 3399 3400 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3401 mlme_dbg_ratelimited(sdata, 3402 "cancelling AP probe due to a received beacon\n"); 3403 ieee80211_reset_ap_probe(sdata); 3404 } 3405 3406 /* 3407 * Push the beacon loss detection into the future since 3408 * we are processing a beacon from the AP just now. 3409 */ 3410 ieee80211_sta_reset_beacon_monitor(sdata); 3411 3412 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3413 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3414 len - baselen, false, &elems, 3415 care_about_ies, ncrc); 3416 3417 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3418 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3419 if (local->hw.conf.dynamic_ps_timeout > 0) { 3420 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3421 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3422 ieee80211_hw_config(local, 3423 IEEE80211_CONF_CHANGE_PS); 3424 } 3425 ieee80211_send_nullfunc(local, sdata, false); 3426 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3427 local->pspolling = true; 3428 3429 /* 3430 * Here is assumed that the driver will be 3431 * able to send ps-poll frame and receive a 3432 * response even though power save mode is 3433 * enabled, but some drivers might require 3434 * to disable power save here. This needs 3435 * to be investigated. 3436 */ 3437 ieee80211_send_pspoll(local, sdata); 3438 } 3439 } 3440 3441 if (sdata->vif.p2p || 3442 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3443 struct ieee80211_p2p_noa_attr noa = {}; 3444 int ret; 3445 3446 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3447 len - baselen, 3448 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3449 (u8 *) &noa, sizeof(noa)); 3450 if (ret >= 2) { 3451 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3452 /* valid noa_attr and index changed */ 3453 sdata->u.mgd.p2p_noa_index = noa.index; 3454 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3455 changed |= BSS_CHANGED_P2P_PS; 3456 /* 3457 * make sure we update all information, the CRC 3458 * mechanism doesn't look at P2P attributes. 3459 */ 3460 ifmgd->beacon_crc_valid = false; 3461 } 3462 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3463 /* noa_attr not found and we had valid noa_attr before */ 3464 sdata->u.mgd.p2p_noa_index = -1; 3465 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3466 changed |= BSS_CHANGED_P2P_PS; 3467 ifmgd->beacon_crc_valid = false; 3468 } 3469 } 3470 3471 if (ifmgd->csa_waiting_bcn) 3472 ieee80211_chswitch_post_beacon(sdata); 3473 3474 /* 3475 * Update beacon timing and dtim count on every beacon appearance. This 3476 * will allow the driver to use the most updated values. Do it before 3477 * comparing this one with last received beacon. 3478 * IMPORTANT: These parameters would possibly be out of sync by the time 3479 * the driver will use them. The synchronized view is currently 3480 * guaranteed only in certain callbacks. 3481 */ 3482 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3483 sdata->vif.bss_conf.sync_tsf = 3484 le64_to_cpu(mgmt->u.beacon.timestamp); 3485 sdata->vif.bss_conf.sync_device_ts = 3486 rx_status->device_timestamp; 3487 if (elems.tim) 3488 sdata->vif.bss_conf.sync_dtim_count = 3489 elems.tim->dtim_count; 3490 else 3491 sdata->vif.bss_conf.sync_dtim_count = 0; 3492 } 3493 3494 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3495 return; 3496 ifmgd->beacon_crc = ncrc; 3497 ifmgd->beacon_crc_valid = true; 3498 3499 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3500 3501 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3502 rx_status->device_timestamp, 3503 &elems, true); 3504 3505 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3506 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3507 elems.wmm_param_len)) 3508 changed |= BSS_CHANGED_QOS; 3509 3510 /* 3511 * If we haven't had a beacon before, tell the driver about the 3512 * DTIM period (and beacon timing if desired) now. 3513 */ 3514 if (!ifmgd->have_beacon) { 3515 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3516 if (elems.tim) 3517 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3518 else 3519 bss_conf->dtim_period = 1; 3520 3521 changed |= BSS_CHANGED_BEACON_INFO; 3522 ifmgd->have_beacon = true; 3523 3524 mutex_lock(&local->iflist_mtx); 3525 ieee80211_recalc_ps(local); 3526 mutex_unlock(&local->iflist_mtx); 3527 3528 ieee80211_recalc_ps_vif(sdata); 3529 } 3530 3531 if (elems.erp_info) { 3532 erp_valid = true; 3533 erp_value = elems.erp_info[0]; 3534 } else { 3535 erp_valid = false; 3536 } 3537 changed |= ieee80211_handle_bss_capability(sdata, 3538 le16_to_cpu(mgmt->u.beacon.capab_info), 3539 erp_valid, erp_value); 3540 3541 mutex_lock(&local->sta_mtx); 3542 sta = sta_info_get(sdata, bssid); 3543 3544 if (ieee80211_config_bw(sdata, sta, 3545 elems.ht_cap_elem, elems.ht_operation, 3546 elems.vht_operation, bssid, &changed)) { 3547 mutex_unlock(&local->sta_mtx); 3548 sdata_info(sdata, 3549 "failed to follow AP %pM bandwidth change, disconnect\n", 3550 bssid); 3551 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3552 WLAN_REASON_DEAUTH_LEAVING, 3553 true, deauth_buf); 3554 ieee80211_report_disconnect(sdata, deauth_buf, 3555 sizeof(deauth_buf), true, 3556 WLAN_REASON_DEAUTH_LEAVING); 3557 return; 3558 } 3559 3560 if (sta && elems.opmode_notif) 3561 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3562 rx_status->band); 3563 mutex_unlock(&local->sta_mtx); 3564 3565 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3566 elems.country_elem, 3567 elems.country_elem_len, 3568 elems.pwr_constr_elem, 3569 elems.cisco_dtpc_elem); 3570 3571 ieee80211_bss_info_change_notify(sdata, changed); 3572 } 3573 3574 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3575 struct sk_buff *skb) 3576 { 3577 struct ieee80211_rx_status *rx_status; 3578 struct ieee80211_mgmt *mgmt; 3579 u16 fc; 3580 struct ieee802_11_elems elems; 3581 int ies_len; 3582 3583 rx_status = (struct ieee80211_rx_status *) skb->cb; 3584 mgmt = (struct ieee80211_mgmt *) skb->data; 3585 fc = le16_to_cpu(mgmt->frame_control); 3586 3587 sdata_lock(sdata); 3588 3589 switch (fc & IEEE80211_FCTL_STYPE) { 3590 case IEEE80211_STYPE_BEACON: 3591 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3592 break; 3593 case IEEE80211_STYPE_PROBE_RESP: 3594 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3595 break; 3596 case IEEE80211_STYPE_AUTH: 3597 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3598 break; 3599 case IEEE80211_STYPE_DEAUTH: 3600 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3601 break; 3602 case IEEE80211_STYPE_DISASSOC: 3603 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3604 break; 3605 case IEEE80211_STYPE_ASSOC_RESP: 3606 case IEEE80211_STYPE_REASSOC_RESP: 3607 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3608 break; 3609 case IEEE80211_STYPE_ACTION: 3610 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3611 ies_len = skb->len - 3612 offsetof(struct ieee80211_mgmt, 3613 u.action.u.chan_switch.variable); 3614 3615 if (ies_len < 0) 3616 break; 3617 3618 ieee802_11_parse_elems( 3619 mgmt->u.action.u.chan_switch.variable, 3620 ies_len, true, &elems); 3621 3622 if (elems.parse_error) 3623 break; 3624 3625 ieee80211_sta_process_chanswitch(sdata, 3626 rx_status->mactime, 3627 rx_status->device_timestamp, 3628 &elems, false); 3629 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3630 ies_len = skb->len - 3631 offsetof(struct ieee80211_mgmt, 3632 u.action.u.ext_chan_switch.variable); 3633 3634 if (ies_len < 0) 3635 break; 3636 3637 ieee802_11_parse_elems( 3638 mgmt->u.action.u.ext_chan_switch.variable, 3639 ies_len, true, &elems); 3640 3641 if (elems.parse_error) 3642 break; 3643 3644 /* for the handling code pretend this was also an IE */ 3645 elems.ext_chansw_ie = 3646 &mgmt->u.action.u.ext_chan_switch.data; 3647 3648 ieee80211_sta_process_chanswitch(sdata, 3649 rx_status->mactime, 3650 rx_status->device_timestamp, 3651 &elems, false); 3652 } 3653 break; 3654 } 3655 sdata_unlock(sdata); 3656 } 3657 3658 static void ieee80211_sta_timer(unsigned long data) 3659 { 3660 struct ieee80211_sub_if_data *sdata = 3661 (struct ieee80211_sub_if_data *) data; 3662 3663 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3664 } 3665 3666 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3667 u8 *bssid, u8 reason, bool tx) 3668 { 3669 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3670 3671 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3672 tx, frame_buf); 3673 3674 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3675 reason); 3676 } 3677 3678 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3679 { 3680 struct ieee80211_local *local = sdata->local; 3681 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3682 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3683 u32 tx_flags = 0; 3684 u16 trans = 1; 3685 u16 status = 0; 3686 3687 sdata_assert_lock(sdata); 3688 3689 if (WARN_ON_ONCE(!auth_data)) 3690 return -EINVAL; 3691 3692 auth_data->tries++; 3693 3694 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3695 sdata_info(sdata, "authentication with %pM timed out\n", 3696 auth_data->bss->bssid); 3697 3698 /* 3699 * Most likely AP is not in the range so remove the 3700 * bss struct for that AP. 3701 */ 3702 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3703 3704 return -ETIMEDOUT; 3705 } 3706 3707 drv_mgd_prepare_tx(local, sdata); 3708 3709 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3710 auth_data->bss->bssid, auth_data->tries, 3711 IEEE80211_AUTH_MAX_TRIES); 3712 3713 auth_data->expected_transaction = 2; 3714 3715 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3716 trans = auth_data->sae_trans; 3717 status = auth_data->sae_status; 3718 auth_data->expected_transaction = trans; 3719 } 3720 3721 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3722 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3723 IEEE80211_TX_INTFL_MLME_CONN_TX; 3724 3725 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3726 auth_data->data, auth_data->data_len, 3727 auth_data->bss->bssid, 3728 auth_data->bss->bssid, NULL, 0, 0, 3729 tx_flags); 3730 3731 if (tx_flags == 0) { 3732 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3733 auth_data->timeout_started = true; 3734 run_again(sdata, auth_data->timeout); 3735 } else { 3736 auth_data->timeout = 3737 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3738 auth_data->timeout_started = true; 3739 run_again(sdata, auth_data->timeout); 3740 } 3741 3742 return 0; 3743 } 3744 3745 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3746 { 3747 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3748 struct ieee80211_local *local = sdata->local; 3749 3750 sdata_assert_lock(sdata); 3751 3752 assoc_data->tries++; 3753 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3754 sdata_info(sdata, "association with %pM timed out\n", 3755 assoc_data->bss->bssid); 3756 3757 /* 3758 * Most likely AP is not in the range so remove the 3759 * bss struct for that AP. 3760 */ 3761 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3762 3763 return -ETIMEDOUT; 3764 } 3765 3766 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3767 assoc_data->bss->bssid, assoc_data->tries, 3768 IEEE80211_ASSOC_MAX_TRIES); 3769 ieee80211_send_assoc(sdata); 3770 3771 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3772 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3773 assoc_data->timeout_started = true; 3774 run_again(sdata, assoc_data->timeout); 3775 } else { 3776 assoc_data->timeout = 3777 round_jiffies_up(jiffies + 3778 IEEE80211_ASSOC_TIMEOUT_LONG); 3779 assoc_data->timeout_started = true; 3780 run_again(sdata, assoc_data->timeout); 3781 } 3782 3783 return 0; 3784 } 3785 3786 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3787 __le16 fc, bool acked) 3788 { 3789 struct ieee80211_local *local = sdata->local; 3790 3791 sdata->u.mgd.status_fc = fc; 3792 sdata->u.mgd.status_acked = acked; 3793 sdata->u.mgd.status_received = true; 3794 3795 ieee80211_queue_work(&local->hw, &sdata->work); 3796 } 3797 3798 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3799 { 3800 struct ieee80211_local *local = sdata->local; 3801 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3802 3803 sdata_lock(sdata); 3804 3805 if (ifmgd->status_received) { 3806 __le16 fc = ifmgd->status_fc; 3807 bool status_acked = ifmgd->status_acked; 3808 3809 ifmgd->status_received = false; 3810 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3811 if (status_acked) { 3812 ifmgd->auth_data->timeout = 3813 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3814 run_again(sdata, ifmgd->auth_data->timeout); 3815 } else { 3816 ifmgd->auth_data->timeout = jiffies - 1; 3817 } 3818 ifmgd->auth_data->timeout_started = true; 3819 } else if (ifmgd->assoc_data && 3820 (ieee80211_is_assoc_req(fc) || 3821 ieee80211_is_reassoc_req(fc))) { 3822 if (status_acked) { 3823 ifmgd->assoc_data->timeout = 3824 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3825 run_again(sdata, ifmgd->assoc_data->timeout); 3826 } else { 3827 ifmgd->assoc_data->timeout = jiffies - 1; 3828 } 3829 ifmgd->assoc_data->timeout_started = true; 3830 } 3831 } 3832 3833 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3834 time_after(jiffies, ifmgd->auth_data->timeout)) { 3835 if (ifmgd->auth_data->done) { 3836 /* 3837 * ok ... we waited for assoc but userspace didn't, 3838 * so let's just kill the auth data 3839 */ 3840 ieee80211_destroy_auth_data(sdata, false); 3841 } else if (ieee80211_auth(sdata)) { 3842 u8 bssid[ETH_ALEN]; 3843 struct ieee80211_event event = { 3844 .type = MLME_EVENT, 3845 .u.mlme.data = AUTH_EVENT, 3846 .u.mlme.status = MLME_TIMEOUT, 3847 }; 3848 3849 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3850 3851 ieee80211_destroy_auth_data(sdata, false); 3852 3853 cfg80211_auth_timeout(sdata->dev, bssid); 3854 drv_event_callback(sdata->local, sdata, &event); 3855 } 3856 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3857 run_again(sdata, ifmgd->auth_data->timeout); 3858 3859 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3860 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3861 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3862 ieee80211_do_assoc(sdata)) { 3863 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3864 struct ieee80211_event event = { 3865 .type = MLME_EVENT, 3866 .u.mlme.data = ASSOC_EVENT, 3867 .u.mlme.status = MLME_TIMEOUT, 3868 }; 3869 3870 ieee80211_destroy_assoc_data(sdata, false); 3871 cfg80211_assoc_timeout(sdata->dev, bss); 3872 drv_event_callback(sdata->local, sdata, &event); 3873 } 3874 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3875 run_again(sdata, ifmgd->assoc_data->timeout); 3876 3877 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3878 ifmgd->associated) { 3879 u8 bssid[ETH_ALEN]; 3880 int max_tries; 3881 3882 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3883 3884 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3885 max_tries = max_nullfunc_tries; 3886 else 3887 max_tries = max_probe_tries; 3888 3889 /* ACK received for nullfunc probing frame */ 3890 if (!ifmgd->probe_send_count) 3891 ieee80211_reset_ap_probe(sdata); 3892 else if (ifmgd->nullfunc_failed) { 3893 if (ifmgd->probe_send_count < max_tries) { 3894 mlme_dbg(sdata, 3895 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3896 bssid, ifmgd->probe_send_count, 3897 max_tries); 3898 ieee80211_mgd_probe_ap_send(sdata); 3899 } else { 3900 mlme_dbg(sdata, 3901 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3902 bssid); 3903 ieee80211_sta_connection_lost(sdata, bssid, 3904 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3905 false); 3906 } 3907 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3908 run_again(sdata, ifmgd->probe_timeout); 3909 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3910 mlme_dbg(sdata, 3911 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3912 bssid, probe_wait_ms); 3913 ieee80211_sta_connection_lost(sdata, bssid, 3914 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3915 } else if (ifmgd->probe_send_count < max_tries) { 3916 mlme_dbg(sdata, 3917 "No probe response from AP %pM after %dms, try %d/%i\n", 3918 bssid, probe_wait_ms, 3919 ifmgd->probe_send_count, max_tries); 3920 ieee80211_mgd_probe_ap_send(sdata); 3921 } else { 3922 /* 3923 * We actually lost the connection ... or did we? 3924 * Let's make sure! 3925 */ 3926 mlme_dbg(sdata, 3927 "No probe response from AP %pM after %dms, disconnecting.\n", 3928 bssid, probe_wait_ms); 3929 3930 ieee80211_sta_connection_lost(sdata, bssid, 3931 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3932 } 3933 } 3934 3935 sdata_unlock(sdata); 3936 } 3937 3938 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3939 { 3940 struct ieee80211_sub_if_data *sdata = 3941 (struct ieee80211_sub_if_data *) data; 3942 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3943 3944 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3945 return; 3946 3947 sdata->u.mgd.connection_loss = false; 3948 ieee80211_queue_work(&sdata->local->hw, 3949 &sdata->u.mgd.beacon_connection_loss_work); 3950 } 3951 3952 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3953 { 3954 struct ieee80211_sub_if_data *sdata = 3955 (struct ieee80211_sub_if_data *) data; 3956 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3957 struct ieee80211_local *local = sdata->local; 3958 3959 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3960 return; 3961 3962 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3963 } 3964 3965 static void ieee80211_sta_monitor_work(struct work_struct *work) 3966 { 3967 struct ieee80211_sub_if_data *sdata = 3968 container_of(work, struct ieee80211_sub_if_data, 3969 u.mgd.monitor_work); 3970 3971 ieee80211_mgd_probe_ap(sdata, false); 3972 } 3973 3974 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3975 { 3976 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3977 __ieee80211_stop_poll(sdata); 3978 3979 /* let's probe the connection once */ 3980 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 3981 ieee80211_queue_work(&sdata->local->hw, 3982 &sdata->u.mgd.monitor_work); 3983 } 3984 } 3985 3986 #ifdef CONFIG_PM 3987 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 3988 { 3989 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3990 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3991 3992 sdata_lock(sdata); 3993 3994 if (ifmgd->auth_data || ifmgd->assoc_data) { 3995 const u8 *bssid = ifmgd->auth_data ? 3996 ifmgd->auth_data->bss->bssid : 3997 ifmgd->assoc_data->bss->bssid; 3998 3999 /* 4000 * If we are trying to authenticate / associate while suspending, 4001 * cfg80211 won't know and won't actually abort those attempts, 4002 * thus we need to do that ourselves. 4003 */ 4004 ieee80211_send_deauth_disassoc(sdata, bssid, 4005 IEEE80211_STYPE_DEAUTH, 4006 WLAN_REASON_DEAUTH_LEAVING, 4007 false, frame_buf); 4008 if (ifmgd->assoc_data) 4009 ieee80211_destroy_assoc_data(sdata, false); 4010 if (ifmgd->auth_data) 4011 ieee80211_destroy_auth_data(sdata, false); 4012 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4013 IEEE80211_DEAUTH_FRAME_LEN); 4014 } 4015 4016 /* This is a bit of a hack - we should find a better and more generic 4017 * solution to this. Normally when suspending, cfg80211 will in fact 4018 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4019 * auth (not so important) or assoc (this is the problem) process. 4020 * 4021 * As a consequence, it can happen that we are in the process of both 4022 * associating and suspending, and receive an association response 4023 * after cfg80211 has checked if it needs to disconnect, but before 4024 * we actually set the flag to drop incoming frames. This will then 4025 * cause the workqueue flush to process the association response in 4026 * the suspend, resulting in a successful association just before it 4027 * tries to remove the interface from the driver, which now though 4028 * has a channel context assigned ... this results in issues. 4029 * 4030 * To work around this (for now) simply deauth here again if we're 4031 * now connected. 4032 */ 4033 if (ifmgd->associated && !sdata->local->wowlan) { 4034 u8 bssid[ETH_ALEN]; 4035 struct cfg80211_deauth_request req = { 4036 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4037 .bssid = bssid, 4038 }; 4039 4040 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4041 ieee80211_mgd_deauth(sdata, &req); 4042 } 4043 4044 sdata_unlock(sdata); 4045 } 4046 4047 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4048 { 4049 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4050 4051 sdata_lock(sdata); 4052 if (!ifmgd->associated) { 4053 sdata_unlock(sdata); 4054 return; 4055 } 4056 4057 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4058 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4059 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4060 ieee80211_sta_connection_lost(sdata, 4061 ifmgd->associated->bssid, 4062 WLAN_REASON_UNSPECIFIED, 4063 true); 4064 sdata_unlock(sdata); 4065 return; 4066 } 4067 sdata_unlock(sdata); 4068 } 4069 #endif 4070 4071 /* interface setup */ 4072 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4073 { 4074 struct ieee80211_if_managed *ifmgd; 4075 4076 ifmgd = &sdata->u.mgd; 4077 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4078 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4079 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4080 ieee80211_beacon_connection_loss_work); 4081 INIT_WORK(&ifmgd->csa_connection_drop_work, 4082 ieee80211_csa_connection_drop_work); 4083 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4084 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4085 ieee80211_tdls_peer_del_work); 4086 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4087 (unsigned long) sdata); 4088 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4089 (unsigned long) sdata); 4090 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4091 (unsigned long) sdata); 4092 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4093 (unsigned long) sdata); 4094 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4095 ieee80211_sta_handle_tspec_ac_params_wk); 4096 4097 ifmgd->flags = 0; 4098 ifmgd->powersave = sdata->wdev.ps; 4099 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4100 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4101 ifmgd->p2p_noa_index = -1; 4102 4103 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4104 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4105 else 4106 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4107 4108 /* Setup TDLS data */ 4109 spin_lock_init(&ifmgd->teardown_lock); 4110 ifmgd->teardown_skb = NULL; 4111 ifmgd->orig_teardown_skb = NULL; 4112 } 4113 4114 /* scan finished notification */ 4115 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4116 { 4117 struct ieee80211_sub_if_data *sdata; 4118 4119 /* Restart STA timers */ 4120 rcu_read_lock(); 4121 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4122 if (ieee80211_sdata_running(sdata)) 4123 ieee80211_restart_sta_timer(sdata); 4124 } 4125 rcu_read_unlock(); 4126 } 4127 4128 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4129 struct cfg80211_bss *cbss) 4130 { 4131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4132 const u8 *ht_cap_ie, *vht_cap_ie; 4133 const struct ieee80211_ht_cap *ht_cap; 4134 const struct ieee80211_vht_cap *vht_cap; 4135 u8 chains = 1; 4136 4137 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4138 return chains; 4139 4140 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4141 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4142 ht_cap = (void *)(ht_cap_ie + 2); 4143 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4144 /* 4145 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4146 * "Tx Unequal Modulation Supported" fields. 4147 */ 4148 } 4149 4150 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4151 return chains; 4152 4153 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4154 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4155 u8 nss; 4156 u16 tx_mcs_map; 4157 4158 vht_cap = (void *)(vht_cap_ie + 2); 4159 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4160 for (nss = 8; nss > 0; nss--) { 4161 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4162 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4163 break; 4164 } 4165 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4166 chains = max(chains, nss); 4167 } 4168 4169 return chains; 4170 } 4171 4172 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4173 struct cfg80211_bss *cbss) 4174 { 4175 struct ieee80211_local *local = sdata->local; 4176 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4177 const struct ieee80211_ht_cap *ht_cap = NULL; 4178 const struct ieee80211_ht_operation *ht_oper = NULL; 4179 const struct ieee80211_vht_operation *vht_oper = NULL; 4180 struct ieee80211_supported_band *sband; 4181 struct cfg80211_chan_def chandef; 4182 int ret; 4183 u32 i; 4184 bool have_80mhz; 4185 4186 sband = local->hw.wiphy->bands[cbss->channel->band]; 4187 4188 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4189 IEEE80211_STA_DISABLE_80P80MHZ | 4190 IEEE80211_STA_DISABLE_160MHZ); 4191 4192 rcu_read_lock(); 4193 4194 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4195 sband->ht_cap.ht_supported) { 4196 const u8 *ht_oper_ie, *ht_cap_ie; 4197 4198 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4199 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4200 ht_oper = (void *)(ht_oper_ie + 2); 4201 4202 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4203 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4204 ht_cap = (void *)(ht_cap_ie + 2); 4205 4206 if (!ht_cap) { 4207 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4208 ht_oper = NULL; 4209 } 4210 } 4211 4212 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4213 sband->vht_cap.vht_supported) { 4214 const u8 *vht_oper_ie, *vht_cap; 4215 4216 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4217 WLAN_EID_VHT_OPERATION); 4218 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4219 vht_oper = (void *)(vht_oper_ie + 2); 4220 if (vht_oper && !ht_oper) { 4221 vht_oper = NULL; 4222 sdata_info(sdata, 4223 "AP advertised VHT without HT, disabling both\n"); 4224 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4225 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4226 } 4227 4228 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4229 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4230 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4231 vht_oper = NULL; 4232 } 4233 } 4234 4235 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4236 have_80mhz = false; 4237 for (i = 0; i < sband->n_channels; i++) { 4238 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4239 IEEE80211_CHAN_NO_80MHZ)) 4240 continue; 4241 4242 have_80mhz = true; 4243 break; 4244 } 4245 4246 if (!have_80mhz) 4247 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4248 4249 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4250 cbss->channel, 4251 ht_cap, ht_oper, vht_oper, 4252 &chandef, false); 4253 4254 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4255 local->rx_chains); 4256 4257 rcu_read_unlock(); 4258 4259 /* will change later if needed */ 4260 sdata->smps_mode = IEEE80211_SMPS_OFF; 4261 4262 mutex_lock(&local->mtx); 4263 /* 4264 * If this fails (possibly due to channel context sharing 4265 * on incompatible channels, e.g. 80+80 and 160 sharing the 4266 * same control channel) try to use a smaller bandwidth. 4267 */ 4268 ret = ieee80211_vif_use_channel(sdata, &chandef, 4269 IEEE80211_CHANCTX_SHARED); 4270 4271 /* don't downgrade for 5 and 10 MHz channels, though. */ 4272 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4273 chandef.width == NL80211_CHAN_WIDTH_10) 4274 goto out; 4275 4276 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4277 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4278 ret = ieee80211_vif_use_channel(sdata, &chandef, 4279 IEEE80211_CHANCTX_SHARED); 4280 } 4281 out: 4282 mutex_unlock(&local->mtx); 4283 return ret; 4284 } 4285 4286 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4287 struct cfg80211_bss *cbss, bool assoc, 4288 bool override) 4289 { 4290 struct ieee80211_local *local = sdata->local; 4291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4292 struct ieee80211_bss *bss = (void *)cbss->priv; 4293 struct sta_info *new_sta = NULL; 4294 struct ieee80211_supported_band *sband; 4295 bool have_sta = false; 4296 int err; 4297 4298 sband = local->hw.wiphy->bands[cbss->channel->band]; 4299 4300 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4301 return -EINVAL; 4302 4303 if (assoc) { 4304 rcu_read_lock(); 4305 have_sta = sta_info_get(sdata, cbss->bssid); 4306 rcu_read_unlock(); 4307 } 4308 4309 if (!have_sta) { 4310 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4311 if (!new_sta) 4312 return -ENOMEM; 4313 } 4314 4315 if (new_sta || override) { 4316 err = ieee80211_prep_channel(sdata, cbss); 4317 if (err) { 4318 if (new_sta) 4319 sta_info_free(local, new_sta); 4320 return -EINVAL; 4321 } 4322 } 4323 4324 if (new_sta) { 4325 u32 rates = 0, basic_rates = 0; 4326 bool have_higher_than_11mbit; 4327 int min_rate = INT_MAX, min_rate_index = -1; 4328 struct ieee80211_chanctx_conf *chanctx_conf; 4329 const struct cfg80211_bss_ies *ies; 4330 int shift = ieee80211_vif_get_shift(&sdata->vif); 4331 u32 rate_flags; 4332 4333 rcu_read_lock(); 4334 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4335 if (WARN_ON(!chanctx_conf)) { 4336 rcu_read_unlock(); 4337 sta_info_free(local, new_sta); 4338 return -EINVAL; 4339 } 4340 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4341 rcu_read_unlock(); 4342 4343 ieee80211_get_rates(sband, bss->supp_rates, 4344 bss->supp_rates_len, 4345 &rates, &basic_rates, 4346 &have_higher_than_11mbit, 4347 &min_rate, &min_rate_index, 4348 shift, rate_flags); 4349 4350 /* 4351 * This used to be a workaround for basic rates missing 4352 * in the association response frame. Now that we no 4353 * longer use the basic rates from there, it probably 4354 * doesn't happen any more, but keep the workaround so 4355 * in case some *other* APs are buggy in different ways 4356 * we can connect -- with a warning. 4357 */ 4358 if (!basic_rates && min_rate_index >= 0) { 4359 sdata_info(sdata, 4360 "No basic rates, using min rate instead\n"); 4361 basic_rates = BIT(min_rate_index); 4362 } 4363 4364 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4365 sdata->vif.bss_conf.basic_rates = basic_rates; 4366 4367 /* cf. IEEE 802.11 9.2.12 */ 4368 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 4369 have_higher_than_11mbit) 4370 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4371 else 4372 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4373 4374 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4375 4376 /* set timing information */ 4377 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4378 rcu_read_lock(); 4379 ies = rcu_dereference(cbss->beacon_ies); 4380 if (ies) { 4381 const u8 *tim_ie; 4382 4383 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4384 sdata->vif.bss_conf.sync_device_ts = 4385 bss->device_ts_beacon; 4386 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4387 ies->data, ies->len); 4388 if (tim_ie && tim_ie[1] >= 2) 4389 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4390 else 4391 sdata->vif.bss_conf.sync_dtim_count = 0; 4392 } else if (!ieee80211_hw_check(&sdata->local->hw, 4393 TIMING_BEACON_ONLY)) { 4394 ies = rcu_dereference(cbss->proberesp_ies); 4395 /* must be non-NULL since beacon IEs were NULL */ 4396 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4397 sdata->vif.bss_conf.sync_device_ts = 4398 bss->device_ts_presp; 4399 sdata->vif.bss_conf.sync_dtim_count = 0; 4400 } else { 4401 sdata->vif.bss_conf.sync_tsf = 0; 4402 sdata->vif.bss_conf.sync_device_ts = 0; 4403 sdata->vif.bss_conf.sync_dtim_count = 0; 4404 } 4405 rcu_read_unlock(); 4406 4407 /* tell driver about BSSID, basic rates and timing */ 4408 ieee80211_bss_info_change_notify(sdata, 4409 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4410 BSS_CHANGED_BEACON_INT); 4411 4412 if (assoc) 4413 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4414 4415 err = sta_info_insert(new_sta); 4416 new_sta = NULL; 4417 if (err) { 4418 sdata_info(sdata, 4419 "failed to insert STA entry for the AP (error %d)\n", 4420 err); 4421 return err; 4422 } 4423 } else 4424 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4425 4426 /* Cancel scan to ensure that nothing interferes with connection */ 4427 if (local->scanning) 4428 ieee80211_scan_cancel(local); 4429 4430 return 0; 4431 } 4432 4433 /* config hooks */ 4434 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4435 struct cfg80211_auth_request *req) 4436 { 4437 struct ieee80211_local *local = sdata->local; 4438 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4439 struct ieee80211_mgd_auth_data *auth_data; 4440 u16 auth_alg; 4441 int err; 4442 4443 /* prepare auth data structure */ 4444 4445 switch (req->auth_type) { 4446 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4447 auth_alg = WLAN_AUTH_OPEN; 4448 break; 4449 case NL80211_AUTHTYPE_SHARED_KEY: 4450 if (IS_ERR(local->wep_tx_tfm)) 4451 return -EOPNOTSUPP; 4452 auth_alg = WLAN_AUTH_SHARED_KEY; 4453 break; 4454 case NL80211_AUTHTYPE_FT: 4455 auth_alg = WLAN_AUTH_FT; 4456 break; 4457 case NL80211_AUTHTYPE_NETWORK_EAP: 4458 auth_alg = WLAN_AUTH_LEAP; 4459 break; 4460 case NL80211_AUTHTYPE_SAE: 4461 auth_alg = WLAN_AUTH_SAE; 4462 break; 4463 default: 4464 return -EOPNOTSUPP; 4465 } 4466 4467 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4468 req->ie_len, GFP_KERNEL); 4469 if (!auth_data) 4470 return -ENOMEM; 4471 4472 auth_data->bss = req->bss; 4473 4474 if (req->sae_data_len >= 4) { 4475 __le16 *pos = (__le16 *) req->sae_data; 4476 auth_data->sae_trans = le16_to_cpu(pos[0]); 4477 auth_data->sae_status = le16_to_cpu(pos[1]); 4478 memcpy(auth_data->data, req->sae_data + 4, 4479 req->sae_data_len - 4); 4480 auth_data->data_len += req->sae_data_len - 4; 4481 } 4482 4483 if (req->ie && req->ie_len) { 4484 memcpy(&auth_data->data[auth_data->data_len], 4485 req->ie, req->ie_len); 4486 auth_data->data_len += req->ie_len; 4487 } 4488 4489 if (req->key && req->key_len) { 4490 auth_data->key_len = req->key_len; 4491 auth_data->key_idx = req->key_idx; 4492 memcpy(auth_data->key, req->key, req->key_len); 4493 } 4494 4495 auth_data->algorithm = auth_alg; 4496 4497 /* try to authenticate/probe */ 4498 4499 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4500 ifmgd->assoc_data) { 4501 err = -EBUSY; 4502 goto err_free; 4503 } 4504 4505 if (ifmgd->auth_data) 4506 ieee80211_destroy_auth_data(sdata, false); 4507 4508 /* prep auth_data so we don't go into idle on disassoc */ 4509 ifmgd->auth_data = auth_data; 4510 4511 if (ifmgd->associated) { 4512 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4513 4514 sdata_info(sdata, 4515 "disconnect from AP %pM for new auth to %pM\n", 4516 ifmgd->associated->bssid, req->bss->bssid); 4517 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4518 WLAN_REASON_UNSPECIFIED, 4519 false, frame_buf); 4520 4521 ieee80211_report_disconnect(sdata, frame_buf, 4522 sizeof(frame_buf), true, 4523 WLAN_REASON_UNSPECIFIED); 4524 } 4525 4526 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4527 4528 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4529 if (err) 4530 goto err_clear; 4531 4532 err = ieee80211_auth(sdata); 4533 if (err) { 4534 sta_info_destroy_addr(sdata, req->bss->bssid); 4535 goto err_clear; 4536 } 4537 4538 /* hold our own reference */ 4539 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4540 return 0; 4541 4542 err_clear: 4543 eth_zero_addr(ifmgd->bssid); 4544 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4545 ifmgd->auth_data = NULL; 4546 mutex_lock(&sdata->local->mtx); 4547 ieee80211_vif_release_channel(sdata); 4548 mutex_unlock(&sdata->local->mtx); 4549 err_free: 4550 kfree(auth_data); 4551 return err; 4552 } 4553 4554 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4555 struct cfg80211_assoc_request *req) 4556 { 4557 struct ieee80211_local *local = sdata->local; 4558 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4559 struct ieee80211_bss *bss = (void *)req->bss->priv; 4560 struct ieee80211_mgd_assoc_data *assoc_data; 4561 const struct cfg80211_bss_ies *beacon_ies; 4562 struct ieee80211_supported_band *sband; 4563 const u8 *ssidie, *ht_ie, *vht_ie; 4564 int i, err; 4565 bool override = false; 4566 4567 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4568 if (!assoc_data) 4569 return -ENOMEM; 4570 4571 rcu_read_lock(); 4572 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4573 if (!ssidie) { 4574 rcu_read_unlock(); 4575 kfree(assoc_data); 4576 return -EINVAL; 4577 } 4578 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4579 assoc_data->ssid_len = ssidie[1]; 4580 rcu_read_unlock(); 4581 4582 if (ifmgd->associated) { 4583 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4584 4585 sdata_info(sdata, 4586 "disconnect from AP %pM for new assoc to %pM\n", 4587 ifmgd->associated->bssid, req->bss->bssid); 4588 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4589 WLAN_REASON_UNSPECIFIED, 4590 false, frame_buf); 4591 4592 ieee80211_report_disconnect(sdata, frame_buf, 4593 sizeof(frame_buf), true, 4594 WLAN_REASON_UNSPECIFIED); 4595 } 4596 4597 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4598 err = -EBUSY; 4599 goto err_free; 4600 } 4601 4602 if (ifmgd->assoc_data) { 4603 err = -EBUSY; 4604 goto err_free; 4605 } 4606 4607 if (ifmgd->auth_data) { 4608 bool match; 4609 4610 /* keep sta info, bssid if matching */ 4611 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4612 ieee80211_destroy_auth_data(sdata, match); 4613 } 4614 4615 /* prepare assoc data */ 4616 4617 ifmgd->beacon_crc_valid = false; 4618 4619 assoc_data->wmm = bss->wmm_used && 4620 (local->hw.queues >= IEEE80211_NUM_ACS); 4621 4622 /* 4623 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4624 * We still associate in non-HT mode (11a/b/g) if any one of these 4625 * ciphers is configured as pairwise. 4626 * We can set this to true for non-11n hardware, that'll be checked 4627 * separately along with the peer capabilities. 4628 */ 4629 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4630 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4631 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4632 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4633 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4634 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4635 netdev_info(sdata->dev, 4636 "disabling HT/VHT due to WEP/TKIP use\n"); 4637 } 4638 } 4639 4640 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4641 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4642 if (!sband->ht_cap.ht_supported || 4643 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4644 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4645 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4646 if (!bss->wmm_used && 4647 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4648 netdev_info(sdata->dev, 4649 "disabling HT as WMM/QoS is not supported by the AP\n"); 4650 } 4651 4652 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4653 if (!sband->vht_cap.vht_supported || 4654 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4655 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4656 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4657 if (!bss->wmm_used && 4658 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4659 netdev_info(sdata->dev, 4660 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4661 } 4662 4663 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4664 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4665 sizeof(ifmgd->ht_capa_mask)); 4666 4667 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4668 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4669 sizeof(ifmgd->vht_capa_mask)); 4670 4671 if (req->ie && req->ie_len) { 4672 memcpy(assoc_data->ie, req->ie, req->ie_len); 4673 assoc_data->ie_len = req->ie_len; 4674 } 4675 4676 assoc_data->bss = req->bss; 4677 4678 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4679 if (ifmgd->powersave) 4680 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4681 else 4682 sdata->smps_mode = IEEE80211_SMPS_OFF; 4683 } else 4684 sdata->smps_mode = ifmgd->req_smps; 4685 4686 assoc_data->capability = req->bss->capability; 4687 assoc_data->supp_rates = bss->supp_rates; 4688 assoc_data->supp_rates_len = bss->supp_rates_len; 4689 4690 rcu_read_lock(); 4691 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4692 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4693 assoc_data->ap_ht_param = 4694 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4695 else 4696 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4697 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4698 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4699 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4700 sizeof(struct ieee80211_vht_cap)); 4701 else 4702 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4703 rcu_read_unlock(); 4704 4705 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4706 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4707 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4708 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4709 4710 if (bss->wmm_used && bss->uapsd_supported && 4711 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4712 assoc_data->uapsd = true; 4713 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4714 } else { 4715 assoc_data->uapsd = false; 4716 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4717 } 4718 4719 if (req->prev_bssid) 4720 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4721 4722 if (req->use_mfp) { 4723 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4724 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4725 } else { 4726 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4727 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4728 } 4729 4730 if (req->flags & ASSOC_REQ_USE_RRM) 4731 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4732 else 4733 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4734 4735 if (req->crypto.control_port) 4736 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4737 else 4738 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4739 4740 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4741 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4742 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4743 sdata->vif.type); 4744 4745 /* kick off associate process */ 4746 4747 ifmgd->assoc_data = assoc_data; 4748 ifmgd->dtim_period = 0; 4749 ifmgd->have_beacon = false; 4750 4751 /* override HT/VHT configuration only if the AP and we support it */ 4752 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4753 struct ieee80211_sta_ht_cap sta_ht_cap; 4754 4755 if (req->flags & ASSOC_REQ_DISABLE_HT) 4756 override = true; 4757 4758 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4759 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4760 4761 /* check for 40 MHz disable override */ 4762 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4763 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4764 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4765 override = true; 4766 4767 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4768 req->flags & ASSOC_REQ_DISABLE_VHT) 4769 override = true; 4770 } 4771 4772 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4773 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4774 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4775 } 4776 4777 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4778 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4779 4780 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4781 if (err) 4782 goto err_clear; 4783 4784 rcu_read_lock(); 4785 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4786 4787 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4788 !beacon_ies) { 4789 /* 4790 * Wait up to one beacon interval ... 4791 * should this be more if we miss one? 4792 */ 4793 sdata_info(sdata, "waiting for beacon from %pM\n", 4794 ifmgd->bssid); 4795 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4796 assoc_data->timeout_started = true; 4797 assoc_data->need_beacon = true; 4798 } else if (beacon_ies) { 4799 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4800 beacon_ies->data, 4801 beacon_ies->len); 4802 u8 dtim_count = 0; 4803 4804 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4805 const struct ieee80211_tim_ie *tim; 4806 tim = (void *)(tim_ie + 2); 4807 ifmgd->dtim_period = tim->dtim_period; 4808 dtim_count = tim->dtim_count; 4809 } 4810 ifmgd->have_beacon = true; 4811 assoc_data->timeout = jiffies; 4812 assoc_data->timeout_started = true; 4813 4814 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4815 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4816 sdata->vif.bss_conf.sync_device_ts = 4817 bss->device_ts_beacon; 4818 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4819 } 4820 } else { 4821 assoc_data->timeout = jiffies; 4822 assoc_data->timeout_started = true; 4823 } 4824 rcu_read_unlock(); 4825 4826 run_again(sdata, assoc_data->timeout); 4827 4828 if (bss->corrupt_data) { 4829 char *corrupt_type = "data"; 4830 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4831 if (bss->corrupt_data & 4832 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4833 corrupt_type = "beacon and probe response"; 4834 else 4835 corrupt_type = "beacon"; 4836 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4837 corrupt_type = "probe response"; 4838 sdata_info(sdata, "associating with AP with corrupt %s\n", 4839 corrupt_type); 4840 } 4841 4842 return 0; 4843 err_clear: 4844 eth_zero_addr(ifmgd->bssid); 4845 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4846 ifmgd->assoc_data = NULL; 4847 err_free: 4848 kfree(assoc_data); 4849 return err; 4850 } 4851 4852 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4853 struct cfg80211_deauth_request *req) 4854 { 4855 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4856 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4857 bool tx = !req->local_state_change; 4858 4859 if (ifmgd->auth_data && 4860 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4861 sdata_info(sdata, 4862 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4863 req->bssid, req->reason_code, 4864 ieee80211_get_reason_code_string(req->reason_code)); 4865 4866 drv_mgd_prepare_tx(sdata->local, sdata); 4867 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4868 IEEE80211_STYPE_DEAUTH, 4869 req->reason_code, tx, 4870 frame_buf); 4871 ieee80211_destroy_auth_data(sdata, false); 4872 ieee80211_report_disconnect(sdata, frame_buf, 4873 sizeof(frame_buf), true, 4874 req->reason_code); 4875 4876 return 0; 4877 } 4878 4879 if (ifmgd->assoc_data && 4880 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4881 sdata_info(sdata, 4882 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4883 req->bssid, req->reason_code, 4884 ieee80211_get_reason_code_string(req->reason_code)); 4885 4886 drv_mgd_prepare_tx(sdata->local, sdata); 4887 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4888 IEEE80211_STYPE_DEAUTH, 4889 req->reason_code, tx, 4890 frame_buf); 4891 ieee80211_destroy_assoc_data(sdata, false); 4892 ieee80211_report_disconnect(sdata, frame_buf, 4893 sizeof(frame_buf), true, 4894 req->reason_code); 4895 return 0; 4896 } 4897 4898 if (ifmgd->associated && 4899 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4900 sdata_info(sdata, 4901 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4902 req->bssid, req->reason_code, 4903 ieee80211_get_reason_code_string(req->reason_code)); 4904 4905 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4906 req->reason_code, tx, frame_buf); 4907 ieee80211_report_disconnect(sdata, frame_buf, 4908 sizeof(frame_buf), true, 4909 req->reason_code); 4910 return 0; 4911 } 4912 4913 return -ENOTCONN; 4914 } 4915 4916 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4917 struct cfg80211_disassoc_request *req) 4918 { 4919 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4920 u8 bssid[ETH_ALEN]; 4921 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4922 4923 /* 4924 * cfg80211 should catch this ... but it's racy since 4925 * we can receive a disassoc frame, process it, hand it 4926 * to cfg80211 while that's in a locked section already 4927 * trying to tell us that the user wants to disconnect. 4928 */ 4929 if (ifmgd->associated != req->bss) 4930 return -ENOLINK; 4931 4932 sdata_info(sdata, 4933 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4934 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4935 4936 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4937 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4938 req->reason_code, !req->local_state_change, 4939 frame_buf); 4940 4941 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 4942 req->reason_code); 4943 4944 return 0; 4945 } 4946 4947 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4948 { 4949 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4950 4951 /* 4952 * Make sure some work items will not run after this, 4953 * they will not do anything but might not have been 4954 * cancelled when disconnecting. 4955 */ 4956 cancel_work_sync(&ifmgd->monitor_work); 4957 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4958 cancel_work_sync(&ifmgd->request_smps_work); 4959 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4960 cancel_work_sync(&ifmgd->chswitch_work); 4961 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4962 4963 sdata_lock(sdata); 4964 if (ifmgd->assoc_data) { 4965 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4966 ieee80211_destroy_assoc_data(sdata, false); 4967 cfg80211_assoc_timeout(sdata->dev, bss); 4968 } 4969 if (ifmgd->auth_data) 4970 ieee80211_destroy_auth_data(sdata, false); 4971 spin_lock_bh(&ifmgd->teardown_lock); 4972 if (ifmgd->teardown_skb) { 4973 kfree_skb(ifmgd->teardown_skb); 4974 ifmgd->teardown_skb = NULL; 4975 ifmgd->orig_teardown_skb = NULL; 4976 } 4977 spin_unlock_bh(&ifmgd->teardown_lock); 4978 del_timer_sync(&ifmgd->timer); 4979 sdata_unlock(sdata); 4980 } 4981 4982 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4983 enum nl80211_cqm_rssi_threshold_event rssi_event, 4984 gfp_t gfp) 4985 { 4986 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4987 4988 trace_api_cqm_rssi_notify(sdata, rssi_event); 4989 4990 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 4991 } 4992 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 4993 4994 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 4995 { 4996 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4997 4998 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 4999 5000 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5001 } 5002 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5003