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 - 2017 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 #include "fils_aead.h" 34 35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 36 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2) 37 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10) 38 #define IEEE80211_AUTH_MAX_TRIES 3 39 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 41 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2) 42 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 43 #define IEEE80211_ASSOC_MAX_TRIES 3 44 45 static int max_nullfunc_tries = 2; 46 module_param(max_nullfunc_tries, int, 0644); 47 MODULE_PARM_DESC(max_nullfunc_tries, 48 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 49 50 static int max_probe_tries = 5; 51 module_param(max_probe_tries, int, 0644); 52 MODULE_PARM_DESC(max_probe_tries, 53 "Maximum probe tries before disconnecting (reason 4)."); 54 55 /* 56 * Beacon loss timeout is calculated as N frames times the 57 * advertised beacon interval. This may need to be somewhat 58 * higher than what hardware might detect to account for 59 * delays in the host processing frames. But since we also 60 * probe on beacon miss before declaring the connection lost 61 * default to what we want. 62 */ 63 static int beacon_loss_count = 7; 64 module_param(beacon_loss_count, int, 0644); 65 MODULE_PARM_DESC(beacon_loss_count, 66 "Number of beacon intervals before we decide beacon was lost."); 67 68 /* 69 * Time the connection can be idle before we probe 70 * it to see if we can still talk to the AP. 71 */ 72 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 73 /* 74 * Time we wait for a probe response after sending 75 * a probe request because of beacon loss or for 76 * checking the connection still works. 77 */ 78 static int probe_wait_ms = 500; 79 module_param(probe_wait_ms, int, 0644); 80 MODULE_PARM_DESC(probe_wait_ms, 81 "Maximum time(ms) to wait for probe response" 82 " before disconnecting (reason 4)."); 83 84 /* 85 * How many Beacon frames need to have been used in average signal strength 86 * before starting to indicate signal change events. 87 */ 88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 89 90 /* 91 * We can have multiple work items (and connection probing) 92 * scheduling this timer, but we need to take care to only 93 * reschedule it when it should fire _earlier_ than it was 94 * asked for before, or if it's not pending right now. This 95 * function ensures that. Note that it then is required to 96 * run this function for all timeouts after the first one 97 * has happened -- the work that runs from this timer will 98 * do that. 99 */ 100 static void run_again(struct ieee80211_sub_if_data *sdata, 101 unsigned long timeout) 102 { 103 sdata_assert_lock(sdata); 104 105 if (!timer_pending(&sdata->u.mgd.timer) || 106 time_before(timeout, sdata->u.mgd.timer.expires)) 107 mod_timer(&sdata->u.mgd.timer, timeout); 108 } 109 110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 111 { 112 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 113 return; 114 115 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 116 return; 117 118 mod_timer(&sdata->u.mgd.bcn_mon_timer, 119 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 120 } 121 122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 123 { 124 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 125 126 if (unlikely(!ifmgd->associated)) 127 return; 128 129 if (ifmgd->probe_send_count) 130 ifmgd->probe_send_count = 0; 131 132 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 133 return; 134 135 mod_timer(&ifmgd->conn_mon_timer, 136 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 137 } 138 139 static int ecw2cw(int ecw) 140 { 141 return (1 << ecw) - 1; 142 } 143 144 static u32 145 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 146 struct ieee80211_supported_band *sband, 147 struct ieee80211_channel *channel, 148 const struct ieee80211_ht_operation *ht_oper, 149 const struct ieee80211_vht_operation *vht_oper, 150 struct cfg80211_chan_def *chandef, bool tracking) 151 { 152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 153 struct cfg80211_chan_def vht_chandef; 154 struct ieee80211_sta_ht_cap sta_ht_cap; 155 u32 ht_cfreq, ret; 156 157 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 158 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 159 160 chandef->chan = channel; 161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 162 chandef->center_freq1 = channel->center_freq; 163 chandef->center_freq2 = 0; 164 165 if (!ht_oper || !sta_ht_cap.ht_supported) { 166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 167 goto out; 168 } 169 170 chandef->width = NL80211_CHAN_WIDTH_20; 171 172 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 173 channel->band); 174 /* check that channel matches the right operating channel */ 175 if (!tracking && channel->center_freq != ht_cfreq) { 176 /* 177 * It's possible that some APs are confused here; 178 * Netgear WNDR3700 sometimes reports 4 higher than 179 * the actual channel in association responses, but 180 * since we look at probe response/beacon data here 181 * it should be OK. 182 */ 183 sdata_info(sdata, 184 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 185 channel->center_freq, ht_cfreq, 186 ht_oper->primary_chan, channel->band); 187 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 188 goto out; 189 } 190 191 /* check 40 MHz support, if we have it */ 192 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 193 ieee80211_chandef_ht_oper(ht_oper, chandef); 194 } else { 195 /* 40 MHz (and 80 MHz) must be supported for VHT */ 196 ret = IEEE80211_STA_DISABLE_VHT; 197 /* also mark 40 MHz disabled */ 198 ret |= IEEE80211_STA_DISABLE_40MHZ; 199 goto out; 200 } 201 202 if (!vht_oper || !sband->vht_cap.vht_supported) { 203 ret = IEEE80211_STA_DISABLE_VHT; 204 goto out; 205 } 206 207 vht_chandef = *chandef; 208 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) { 209 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 210 sdata_info(sdata, 211 "AP VHT information is invalid, disable VHT\n"); 212 ret = IEEE80211_STA_DISABLE_VHT; 213 goto out; 214 } 215 216 if (!cfg80211_chandef_valid(&vht_chandef)) { 217 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 218 sdata_info(sdata, 219 "AP VHT information is invalid, disable VHT\n"); 220 ret = IEEE80211_STA_DISABLE_VHT; 221 goto out; 222 } 223 224 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 225 ret = 0; 226 goto out; 227 } 228 229 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 230 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 231 sdata_info(sdata, 232 "AP VHT information doesn't match HT, disable VHT\n"); 233 ret = IEEE80211_STA_DISABLE_VHT; 234 goto out; 235 } 236 237 *chandef = vht_chandef; 238 239 ret = 0; 240 241 out: 242 /* 243 * When tracking the current AP, don't do any further checks if the 244 * new chandef is identical to the one we're currently using for the 245 * connection. This keeps us from playing ping-pong with regulatory, 246 * without it the following can happen (for example): 247 * - connect to an AP with 80 MHz, world regdom allows 80 MHz 248 * - AP advertises regdom US 249 * - CRDA loads regdom US with 80 MHz prohibited (old database) 250 * - the code below detects an unsupported channel, downgrades, and 251 * we disconnect from the AP in the caller 252 * - disconnect causes CRDA to reload world regdomain and the game 253 * starts anew. 254 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) 255 * 256 * It seems possible that there are still scenarios with CSA or real 257 * bandwidth changes where a this could happen, but those cases are 258 * less common and wouldn't completely prevent using the AP. 259 */ 260 if (tracking && 261 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) 262 return ret; 263 264 /* don't print the message below for VHT mismatch if VHT is disabled */ 265 if (ret & IEEE80211_STA_DISABLE_VHT) 266 vht_chandef = *chandef; 267 268 /* 269 * Ignore the DISABLED flag when we're already connected and only 270 * tracking the APs beacon for bandwidth changes - otherwise we 271 * might get disconnected here if we connect to an AP, update our 272 * regulatory information based on the AP's country IE and the 273 * information we have is wrong/outdated and disables the channel 274 * that we're actually using for the connection to the AP. 275 */ 276 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 277 tracking ? 0 : 278 IEEE80211_CHAN_DISABLED)) { 279 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 280 ret = IEEE80211_STA_DISABLE_HT | 281 IEEE80211_STA_DISABLE_VHT; 282 break; 283 } 284 285 ret |= ieee80211_chandef_downgrade(chandef); 286 } 287 288 if (chandef->width != vht_chandef.width && !tracking) 289 sdata_info(sdata, 290 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 291 292 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 293 return ret; 294 } 295 296 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 297 struct sta_info *sta, 298 const struct ieee80211_ht_cap *ht_cap, 299 const struct ieee80211_ht_operation *ht_oper, 300 const struct ieee80211_vht_operation *vht_oper, 301 const u8 *bssid, u32 *changed) 302 { 303 struct ieee80211_local *local = sdata->local; 304 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 305 struct ieee80211_supported_band *sband; 306 struct ieee80211_channel *chan; 307 struct cfg80211_chan_def chandef; 308 u16 ht_opmode; 309 u32 flags; 310 enum ieee80211_sta_rx_bandwidth new_sta_bw; 311 int ret; 312 313 /* if HT was/is disabled, don't track any bandwidth changes */ 314 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 315 return 0; 316 317 /* don't check VHT if we associated as non-VHT station */ 318 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 319 vht_oper = NULL; 320 321 if (WARN_ON_ONCE(!sta)) 322 return -EINVAL; 323 324 /* 325 * if bss configuration changed store the new one - 326 * this may be applicable even if channel is identical 327 */ 328 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 329 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 330 *changed |= BSS_CHANGED_HT; 331 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 332 } 333 334 chan = sdata->vif.bss_conf.chandef.chan; 335 sband = local->hw.wiphy->bands[chan->band]; 336 337 /* calculate new channel (type) based on HT/VHT operation IEs */ 338 flags = ieee80211_determine_chantype(sdata, sband, chan, 339 ht_oper, vht_oper, 340 &chandef, true); 341 342 /* 343 * Downgrade the new channel if we associated with restricted 344 * capabilities. For example, if we associated as a 20 MHz STA 345 * to a 40 MHz AP (due to regulatory, capabilities or config 346 * reasons) then switching to a 40 MHz channel now won't do us 347 * any good -- we couldn't use it with the AP. 348 */ 349 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 350 chandef.width == NL80211_CHAN_WIDTH_80P80) 351 flags |= ieee80211_chandef_downgrade(&chandef); 352 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 353 chandef.width == NL80211_CHAN_WIDTH_160) 354 flags |= ieee80211_chandef_downgrade(&chandef); 355 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 356 chandef.width > NL80211_CHAN_WIDTH_20) 357 flags |= ieee80211_chandef_downgrade(&chandef); 358 359 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 360 return 0; 361 362 sdata_info(sdata, 363 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 364 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 365 chandef.center_freq1, chandef.center_freq2); 366 367 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 368 IEEE80211_STA_DISABLE_VHT | 369 IEEE80211_STA_DISABLE_40MHZ | 370 IEEE80211_STA_DISABLE_80P80MHZ | 371 IEEE80211_STA_DISABLE_160MHZ)) || 372 !cfg80211_chandef_valid(&chandef)) { 373 sdata_info(sdata, 374 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 375 ifmgd->bssid); 376 return -EINVAL; 377 } 378 379 switch (chandef.width) { 380 case NL80211_CHAN_WIDTH_20_NOHT: 381 case NL80211_CHAN_WIDTH_20: 382 new_sta_bw = IEEE80211_STA_RX_BW_20; 383 break; 384 case NL80211_CHAN_WIDTH_40: 385 new_sta_bw = IEEE80211_STA_RX_BW_40; 386 break; 387 case NL80211_CHAN_WIDTH_80: 388 new_sta_bw = IEEE80211_STA_RX_BW_80; 389 break; 390 case NL80211_CHAN_WIDTH_80P80: 391 case NL80211_CHAN_WIDTH_160: 392 new_sta_bw = IEEE80211_STA_RX_BW_160; 393 break; 394 default: 395 return -EINVAL; 396 } 397 398 if (new_sta_bw > sta->cur_max_bandwidth) 399 new_sta_bw = sta->cur_max_bandwidth; 400 401 if (new_sta_bw < sta->sta.bandwidth) { 402 sta->sta.bandwidth = new_sta_bw; 403 rate_control_rate_update(local, sband, sta, 404 IEEE80211_RC_BW_CHANGED); 405 } 406 407 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 408 if (ret) { 409 sdata_info(sdata, 410 "AP %pM changed bandwidth to incompatible one - disconnect\n", 411 ifmgd->bssid); 412 return ret; 413 } 414 415 if (new_sta_bw > sta->sta.bandwidth) { 416 sta->sta.bandwidth = new_sta_bw; 417 rate_control_rate_update(local, sband, sta, 418 IEEE80211_RC_BW_CHANGED); 419 } 420 421 return 0; 422 } 423 424 /* frame sending functions */ 425 426 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 427 struct sk_buff *skb, u8 ap_ht_param, 428 struct ieee80211_supported_band *sband, 429 struct ieee80211_channel *channel, 430 enum ieee80211_smps_mode smps) 431 { 432 u8 *pos; 433 u32 flags = channel->flags; 434 u16 cap; 435 struct ieee80211_sta_ht_cap ht_cap; 436 437 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 438 439 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 440 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 441 442 /* determine capability flags */ 443 cap = ht_cap.cap; 444 445 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 446 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 447 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 448 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 449 cap &= ~IEEE80211_HT_CAP_SGI_40; 450 } 451 break; 452 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 453 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 454 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 455 cap &= ~IEEE80211_HT_CAP_SGI_40; 456 } 457 break; 458 } 459 460 /* 461 * If 40 MHz was disabled associate as though we weren't 462 * capable of 40 MHz -- some broken APs will never fall 463 * back to trying to transmit in 20 MHz. 464 */ 465 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 466 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 467 cap &= ~IEEE80211_HT_CAP_SGI_40; 468 } 469 470 /* set SM PS mode properly */ 471 cap &= ~IEEE80211_HT_CAP_SM_PS; 472 switch (smps) { 473 case IEEE80211_SMPS_AUTOMATIC: 474 case IEEE80211_SMPS_NUM_MODES: 475 WARN_ON(1); 476 /* fall through */ 477 case IEEE80211_SMPS_OFF: 478 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 479 IEEE80211_HT_CAP_SM_PS_SHIFT; 480 break; 481 case IEEE80211_SMPS_STATIC: 482 cap |= WLAN_HT_CAP_SM_PS_STATIC << 483 IEEE80211_HT_CAP_SM_PS_SHIFT; 484 break; 485 case IEEE80211_SMPS_DYNAMIC: 486 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 487 IEEE80211_HT_CAP_SM_PS_SHIFT; 488 break; 489 } 490 491 /* reserve and fill IE */ 492 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 493 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 494 } 495 496 /* This function determines vht capability flags for the association 497 * and builds the IE. 498 * Note - the function may set the owner of the MU-MIMO capability 499 */ 500 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 501 struct sk_buff *skb, 502 struct ieee80211_supported_band *sband, 503 struct ieee80211_vht_cap *ap_vht_cap) 504 { 505 struct ieee80211_local *local = sdata->local; 506 u8 *pos; 507 u32 cap; 508 struct ieee80211_sta_vht_cap vht_cap; 509 u32 mask, ap_bf_sts, our_bf_sts; 510 511 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 512 513 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 514 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 515 516 /* determine capability flags */ 517 cap = vht_cap.cap; 518 519 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 520 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 521 522 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 523 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 524 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 525 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 526 } 527 528 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 529 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 530 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 531 } 532 533 /* 534 * Some APs apparently get confused if our capabilities are better 535 * than theirs, so restrict what we advertise in the assoc request. 536 */ 537 if (!(ap_vht_cap->vht_cap_info & 538 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 539 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 540 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE); 541 else if (!(ap_vht_cap->vht_cap_info & 542 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE))) 543 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 544 545 /* 546 * If some other vif is using the MU-MIMO capablity we cannot associate 547 * using MU-MIMO - this will lead to contradictions in the group-id 548 * mechanism. 549 * Ownership is defined since association request, in order to avoid 550 * simultaneous associations with MU-MIMO. 551 */ 552 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) { 553 bool disable_mu_mimo = false; 554 struct ieee80211_sub_if_data *other; 555 556 list_for_each_entry_rcu(other, &local->interfaces, list) { 557 if (other->vif.mu_mimo_owner) { 558 disable_mu_mimo = true; 559 break; 560 } 561 } 562 if (disable_mu_mimo) 563 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 564 else 565 sdata->vif.mu_mimo_owner = true; 566 } 567 568 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 569 570 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 571 our_bf_sts = cap & mask; 572 573 if (ap_bf_sts < our_bf_sts) { 574 cap &= ~mask; 575 cap |= ap_bf_sts; 576 } 577 578 /* reserve and fill IE */ 579 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 580 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 581 } 582 583 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 584 { 585 struct ieee80211_local *local = sdata->local; 586 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 587 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 588 struct sk_buff *skb; 589 struct ieee80211_mgmt *mgmt; 590 u8 *pos, qos_info; 591 size_t offset = 0, noffset; 592 int i, count, rates_len, supp_rates_len, shift; 593 u16 capab; 594 struct ieee80211_supported_band *sband; 595 struct ieee80211_chanctx_conf *chanctx_conf; 596 struct ieee80211_channel *chan; 597 u32 rates = 0; 598 599 sdata_assert_lock(sdata); 600 601 rcu_read_lock(); 602 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 603 if (WARN_ON(!chanctx_conf)) { 604 rcu_read_unlock(); 605 return; 606 } 607 chan = chanctx_conf->def.chan; 608 rcu_read_unlock(); 609 sband = local->hw.wiphy->bands[chan->band]; 610 shift = ieee80211_vif_get_shift(&sdata->vif); 611 612 if (assoc_data->supp_rates_len) { 613 /* 614 * Get all rates supported by the device and the AP as 615 * some APs don't like getting a superset of their rates 616 * in the association request (e.g. D-Link DAP 1353 in 617 * b-only mode)... 618 */ 619 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 620 assoc_data->supp_rates, 621 assoc_data->supp_rates_len, 622 &rates); 623 } else { 624 /* 625 * In case AP not provide any supported rates information 626 * before association, we send information element(s) with 627 * all rates that we support. 628 */ 629 rates_len = 0; 630 for (i = 0; i < sband->n_bitrates; i++) { 631 rates |= BIT(i); 632 rates_len++; 633 } 634 } 635 636 skb = alloc_skb(local->hw.extra_tx_headroom + 637 sizeof(*mgmt) + /* bit too much but doesn't matter */ 638 2 + assoc_data->ssid_len + /* SSID */ 639 4 + rates_len + /* (extended) rates */ 640 4 + /* power capability */ 641 2 + 2 * sband->n_channels + /* supported channels */ 642 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 643 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 644 assoc_data->ie_len + /* extra IEs */ 645 (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) + 646 9, /* WMM */ 647 GFP_KERNEL); 648 if (!skb) 649 return; 650 651 skb_reserve(skb, local->hw.extra_tx_headroom); 652 653 capab = WLAN_CAPABILITY_ESS; 654 655 if (sband->band == NL80211_BAND_2GHZ) { 656 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 657 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 658 } 659 660 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 661 capab |= WLAN_CAPABILITY_PRIVACY; 662 663 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 664 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT)) 665 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 666 667 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 668 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 669 670 mgmt = skb_put_zero(skb, 24); 671 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 672 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 673 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 674 675 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 676 skb_put(skb, 10); 677 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 678 IEEE80211_STYPE_REASSOC_REQ); 679 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 680 mgmt->u.reassoc_req.listen_interval = 681 cpu_to_le16(local->hw.conf.listen_interval); 682 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 683 ETH_ALEN); 684 } else { 685 skb_put(skb, 4); 686 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 687 IEEE80211_STYPE_ASSOC_REQ); 688 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 689 mgmt->u.assoc_req.listen_interval = 690 cpu_to_le16(local->hw.conf.listen_interval); 691 } 692 693 /* SSID */ 694 pos = skb_put(skb, 2 + assoc_data->ssid_len); 695 *pos++ = WLAN_EID_SSID; 696 *pos++ = assoc_data->ssid_len; 697 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 698 699 /* add all rates which were marked to be used above */ 700 supp_rates_len = rates_len; 701 if (supp_rates_len > 8) 702 supp_rates_len = 8; 703 704 pos = skb_put(skb, supp_rates_len + 2); 705 *pos++ = WLAN_EID_SUPP_RATES; 706 *pos++ = supp_rates_len; 707 708 count = 0; 709 for (i = 0; i < sband->n_bitrates; i++) { 710 if (BIT(i) & rates) { 711 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 712 5 * (1 << shift)); 713 *pos++ = (u8) rate; 714 if (++count == 8) 715 break; 716 } 717 } 718 719 if (rates_len > count) { 720 pos = skb_put(skb, rates_len - count + 2); 721 *pos++ = WLAN_EID_EXT_SUPP_RATES; 722 *pos++ = rates_len - count; 723 724 for (i++; i < sband->n_bitrates; i++) { 725 if (BIT(i) & rates) { 726 int rate; 727 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 728 5 * (1 << shift)); 729 *pos++ = (u8) rate; 730 } 731 } 732 } 733 734 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 735 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 736 pos = skb_put(skb, 4); 737 *pos++ = WLAN_EID_PWR_CAPABILITY; 738 *pos++ = 2; 739 *pos++ = 0; /* min tx power */ 740 /* max tx power */ 741 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 742 } 743 744 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 745 /* TODO: get this in reg domain format */ 746 pos = skb_put(skb, 2 * sband->n_channels + 2); 747 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 748 *pos++ = 2 * sband->n_channels; 749 for (i = 0; i < sband->n_channels; i++) { 750 *pos++ = ieee80211_frequency_to_channel( 751 sband->channels[i].center_freq); 752 *pos++ = 1; /* one channel in the subband*/ 753 } 754 } 755 756 /* if present, add any custom IEs that go before HT */ 757 if (assoc_data->ie_len) { 758 static const u8 before_ht[] = { 759 WLAN_EID_SSID, 760 WLAN_EID_SUPP_RATES, 761 WLAN_EID_EXT_SUPP_RATES, 762 WLAN_EID_PWR_CAPABILITY, 763 WLAN_EID_SUPPORTED_CHANNELS, 764 WLAN_EID_RSN, 765 WLAN_EID_QOS_CAPA, 766 WLAN_EID_RRM_ENABLED_CAPABILITIES, 767 WLAN_EID_MOBILITY_DOMAIN, 768 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 769 WLAN_EID_RIC_DATA, /* reassoc only */ 770 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 771 }; 772 static const u8 after_ric[] = { 773 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 774 WLAN_EID_HT_CAPABILITY, 775 WLAN_EID_BSS_COEX_2040, 776 /* luckily this is almost always there */ 777 WLAN_EID_EXT_CAPABILITY, 778 WLAN_EID_QOS_TRAFFIC_CAPA, 779 WLAN_EID_TIM_BCAST_REQ, 780 WLAN_EID_INTERWORKING, 781 /* 60 GHz (Multi-band, DMG, MMS) can't happen */ 782 WLAN_EID_VHT_CAPABILITY, 783 WLAN_EID_OPMODE_NOTIF, 784 }; 785 786 noffset = ieee80211_ie_split_ric(assoc_data->ie, 787 assoc_data->ie_len, 788 before_ht, 789 ARRAY_SIZE(before_ht), 790 after_ric, 791 ARRAY_SIZE(after_ric), 792 offset); 793 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 794 offset = noffset; 795 } 796 797 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 798 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 799 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 800 801 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 802 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 803 sband, chan, sdata->smps_mode); 804 805 /* if present, add any custom IEs that go before VHT */ 806 if (assoc_data->ie_len) { 807 static const u8 before_vht[] = { 808 /* 809 * no need to list the ones split off before HT 810 * or generated here 811 */ 812 WLAN_EID_BSS_COEX_2040, 813 WLAN_EID_EXT_CAPABILITY, 814 WLAN_EID_QOS_TRAFFIC_CAPA, 815 WLAN_EID_TIM_BCAST_REQ, 816 WLAN_EID_INTERWORKING, 817 /* 60 GHz (Multi-band, DMG, MMS) can't happen */ 818 }; 819 820 /* RIC already taken above, so no need to handle here anymore */ 821 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 822 before_vht, ARRAY_SIZE(before_vht), 823 offset); 824 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 825 offset = noffset; 826 } 827 828 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 829 ieee80211_add_vht_ie(sdata, skb, sband, 830 &assoc_data->ap_vht_cap); 831 832 /* if present, add any custom non-vendor IEs that go after HT */ 833 if (assoc_data->ie_len) { 834 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 835 assoc_data->ie_len, 836 offset); 837 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 838 offset = noffset; 839 } 840 841 if (assoc_data->wmm) { 842 if (assoc_data->uapsd) { 843 qos_info = ifmgd->uapsd_queues; 844 qos_info |= (ifmgd->uapsd_max_sp_len << 845 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 846 } else { 847 qos_info = 0; 848 } 849 850 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 851 } 852 853 /* add any remaining custom (i.e. vendor specific here) IEs */ 854 if (assoc_data->ie_len) { 855 noffset = assoc_data->ie_len; 856 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 857 } 858 859 if (assoc_data->fils_kek_len && 860 fils_encrypt_assoc_req(skb, assoc_data) < 0) { 861 dev_kfree_skb(skb); 862 return; 863 } 864 865 drv_mgd_prepare_tx(local, sdata); 866 867 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 868 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 869 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 870 IEEE80211_TX_INTFL_MLME_CONN_TX; 871 ieee80211_tx_skb(sdata, skb); 872 } 873 874 void ieee80211_send_pspoll(struct ieee80211_local *local, 875 struct ieee80211_sub_if_data *sdata) 876 { 877 struct ieee80211_pspoll *pspoll; 878 struct sk_buff *skb; 879 880 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 881 if (!skb) 882 return; 883 884 pspoll = (struct ieee80211_pspoll *) skb->data; 885 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 886 887 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 888 ieee80211_tx_skb(sdata, skb); 889 } 890 891 void ieee80211_send_nullfunc(struct ieee80211_local *local, 892 struct ieee80211_sub_if_data *sdata, 893 bool powersave) 894 { 895 struct sk_buff *skb; 896 struct ieee80211_hdr_3addr *nullfunc; 897 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 898 899 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif, 900 !ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP)); 901 if (!skb) 902 return; 903 904 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 905 if (powersave) 906 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 907 908 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 909 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 910 911 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 912 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 913 914 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 915 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 916 917 ieee80211_tx_skb(sdata, skb); 918 } 919 920 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 921 struct ieee80211_sub_if_data *sdata) 922 { 923 struct sk_buff *skb; 924 struct ieee80211_hdr *nullfunc; 925 __le16 fc; 926 927 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 928 return; 929 930 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 931 if (!skb) 932 return; 933 934 skb_reserve(skb, local->hw.extra_tx_headroom); 935 936 nullfunc = skb_put_zero(skb, 30); 937 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 938 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 939 nullfunc->frame_control = fc; 940 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 941 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 942 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 943 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 944 945 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 946 ieee80211_tx_skb(sdata, skb); 947 } 948 949 /* spectrum management related things */ 950 static void ieee80211_chswitch_work(struct work_struct *work) 951 { 952 struct ieee80211_sub_if_data *sdata = 953 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 954 struct ieee80211_local *local = sdata->local; 955 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 956 int ret; 957 958 if (!ieee80211_sdata_running(sdata)) 959 return; 960 961 sdata_lock(sdata); 962 mutex_lock(&local->mtx); 963 mutex_lock(&local->chanctx_mtx); 964 965 if (!ifmgd->associated) 966 goto out; 967 968 if (!sdata->vif.csa_active) 969 goto out; 970 971 /* 972 * using reservation isn't immediate as it may be deferred until later 973 * with multi-vif. once reservation is complete it will re-schedule the 974 * work with no reserved_chanctx so verify chandef to check if it 975 * completed successfully 976 */ 977 978 if (sdata->reserved_chanctx) { 979 /* 980 * with multi-vif csa driver may call ieee80211_csa_finish() 981 * many times while waiting for other interfaces to use their 982 * reservations 983 */ 984 if (sdata->reserved_ready) 985 goto out; 986 987 ret = ieee80211_vif_use_reserved_context(sdata); 988 if (ret) { 989 sdata_info(sdata, 990 "failed to use reserved channel context, disconnecting (err=%d)\n", 991 ret); 992 ieee80211_queue_work(&sdata->local->hw, 993 &ifmgd->csa_connection_drop_work); 994 goto out; 995 } 996 997 goto out; 998 } 999 1000 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 1001 &sdata->csa_chandef)) { 1002 sdata_info(sdata, 1003 "failed to finalize channel switch, disconnecting\n"); 1004 ieee80211_queue_work(&sdata->local->hw, 1005 &ifmgd->csa_connection_drop_work); 1006 goto out; 1007 } 1008 1009 /* XXX: shouldn't really modify cfg80211-owned data! */ 1010 ifmgd->associated->channel = sdata->csa_chandef.chan; 1011 1012 ifmgd->csa_waiting_bcn = true; 1013 1014 ieee80211_sta_reset_beacon_monitor(sdata); 1015 ieee80211_sta_reset_conn_monitor(sdata); 1016 1017 out: 1018 mutex_unlock(&local->chanctx_mtx); 1019 mutex_unlock(&local->mtx); 1020 sdata_unlock(sdata); 1021 } 1022 1023 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1024 { 1025 struct ieee80211_local *local = sdata->local; 1026 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1027 int ret; 1028 1029 sdata_assert_lock(sdata); 1030 1031 WARN_ON(!sdata->vif.csa_active); 1032 1033 if (sdata->csa_block_tx) { 1034 ieee80211_wake_vif_queues(local, sdata, 1035 IEEE80211_QUEUE_STOP_REASON_CSA); 1036 sdata->csa_block_tx = false; 1037 } 1038 1039 sdata->vif.csa_active = false; 1040 ifmgd->csa_waiting_bcn = false; 1041 1042 ret = drv_post_channel_switch(sdata); 1043 if (ret) { 1044 sdata_info(sdata, 1045 "driver post channel switch failed, disconnecting\n"); 1046 ieee80211_queue_work(&local->hw, 1047 &ifmgd->csa_connection_drop_work); 1048 return; 1049 } 1050 1051 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1052 } 1053 1054 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1055 { 1056 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1057 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1058 1059 trace_api_chswitch_done(sdata, success); 1060 if (!success) { 1061 sdata_info(sdata, 1062 "driver channel switch failed, disconnecting\n"); 1063 ieee80211_queue_work(&sdata->local->hw, 1064 &ifmgd->csa_connection_drop_work); 1065 } else { 1066 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1067 } 1068 } 1069 EXPORT_SYMBOL(ieee80211_chswitch_done); 1070 1071 static void ieee80211_chswitch_timer(struct timer_list *t) 1072 { 1073 struct ieee80211_sub_if_data *sdata = 1074 from_timer(sdata, t, u.mgd.chswitch_timer); 1075 1076 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1077 } 1078 1079 static void 1080 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1081 u64 timestamp, u32 device_timestamp, 1082 struct ieee802_11_elems *elems, 1083 bool beacon) 1084 { 1085 struct ieee80211_local *local = sdata->local; 1086 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1087 struct cfg80211_bss *cbss = ifmgd->associated; 1088 struct ieee80211_chanctx_conf *conf; 1089 struct ieee80211_chanctx *chanctx; 1090 enum nl80211_band current_band; 1091 struct ieee80211_csa_ie csa_ie; 1092 struct ieee80211_channel_switch ch_switch; 1093 int res; 1094 1095 sdata_assert_lock(sdata); 1096 1097 if (!cbss) 1098 return; 1099 1100 if (local->scanning) 1101 return; 1102 1103 /* disregard subsequent announcements if we are already processing */ 1104 if (sdata->vif.csa_active) 1105 return; 1106 1107 current_band = cbss->channel->band; 1108 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1109 ifmgd->flags, 1110 ifmgd->associated->bssid, &csa_ie); 1111 if (res < 0) 1112 ieee80211_queue_work(&local->hw, 1113 &ifmgd->csa_connection_drop_work); 1114 if (res) 1115 return; 1116 1117 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1118 IEEE80211_CHAN_DISABLED)) { 1119 sdata_info(sdata, 1120 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1121 ifmgd->associated->bssid, 1122 csa_ie.chandef.chan->center_freq, 1123 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1124 csa_ie.chandef.center_freq2); 1125 ieee80211_queue_work(&local->hw, 1126 &ifmgd->csa_connection_drop_work); 1127 return; 1128 } 1129 1130 if (cfg80211_chandef_identical(&csa_ie.chandef, 1131 &sdata->vif.bss_conf.chandef)) { 1132 if (ifmgd->csa_ignored_same_chan) 1133 return; 1134 sdata_info(sdata, 1135 "AP %pM tries to chanswitch to same channel, ignore\n", 1136 ifmgd->associated->bssid); 1137 ifmgd->csa_ignored_same_chan = true; 1138 return; 1139 } 1140 1141 /* 1142 * Drop all TDLS peers - either we disconnect or move to a different 1143 * channel from this point on. There's no telling what our peer will do. 1144 * The TDLS WIDER_BW scenario is also problematic, as peers might now 1145 * have an incompatible wider chandef. 1146 */ 1147 ieee80211_teardown_tdls_peers(sdata); 1148 1149 mutex_lock(&local->mtx); 1150 mutex_lock(&local->chanctx_mtx); 1151 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1152 lockdep_is_held(&local->chanctx_mtx)); 1153 if (!conf) { 1154 sdata_info(sdata, 1155 "no channel context assigned to vif?, disconnecting\n"); 1156 goto drop_connection; 1157 } 1158 1159 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1160 1161 if (local->use_chanctx && 1162 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) { 1163 sdata_info(sdata, 1164 "driver doesn't support chan-switch with channel contexts\n"); 1165 goto drop_connection; 1166 } 1167 1168 ch_switch.timestamp = timestamp; 1169 ch_switch.device_timestamp = device_timestamp; 1170 ch_switch.block_tx = csa_ie.mode; 1171 ch_switch.chandef = csa_ie.chandef; 1172 ch_switch.count = csa_ie.count; 1173 1174 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1175 sdata_info(sdata, 1176 "preparing for channel switch failed, disconnecting\n"); 1177 goto drop_connection; 1178 } 1179 1180 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1181 chanctx->mode, false); 1182 if (res) { 1183 sdata_info(sdata, 1184 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1185 res); 1186 goto drop_connection; 1187 } 1188 mutex_unlock(&local->chanctx_mtx); 1189 1190 sdata->vif.csa_active = true; 1191 sdata->csa_chandef = csa_ie.chandef; 1192 sdata->csa_block_tx = csa_ie.mode; 1193 ifmgd->csa_ignored_same_chan = false; 1194 1195 if (sdata->csa_block_tx) 1196 ieee80211_stop_vif_queues(local, sdata, 1197 IEEE80211_QUEUE_STOP_REASON_CSA); 1198 mutex_unlock(&local->mtx); 1199 1200 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1201 csa_ie.count); 1202 1203 if (local->ops->channel_switch) { 1204 /* use driver's channel switch callback */ 1205 drv_channel_switch(local, sdata, &ch_switch); 1206 return; 1207 } 1208 1209 /* channel switch handled in software */ 1210 if (csa_ie.count <= 1) 1211 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1212 else 1213 mod_timer(&ifmgd->chswitch_timer, 1214 TU_TO_EXP_TIME((csa_ie.count - 1) * 1215 cbss->beacon_interval)); 1216 return; 1217 drop_connection: 1218 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); 1219 mutex_unlock(&local->chanctx_mtx); 1220 mutex_unlock(&local->mtx); 1221 } 1222 1223 static bool 1224 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1225 struct ieee80211_channel *channel, 1226 const u8 *country_ie, u8 country_ie_len, 1227 const u8 *pwr_constr_elem, 1228 int *chan_pwr, int *pwr_reduction) 1229 { 1230 struct ieee80211_country_ie_triplet *triplet; 1231 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1232 int i, chan_increment; 1233 bool have_chan_pwr = false; 1234 1235 /* Invalid IE */ 1236 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1237 return false; 1238 1239 triplet = (void *)(country_ie + 3); 1240 country_ie_len -= 3; 1241 1242 switch (channel->band) { 1243 default: 1244 WARN_ON_ONCE(1); 1245 /* fall through */ 1246 case NL80211_BAND_2GHZ: 1247 case NL80211_BAND_60GHZ: 1248 chan_increment = 1; 1249 break; 1250 case NL80211_BAND_5GHZ: 1251 chan_increment = 4; 1252 break; 1253 } 1254 1255 /* find channel */ 1256 while (country_ie_len >= 3) { 1257 u8 first_channel = triplet->chans.first_channel; 1258 1259 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1260 goto next; 1261 1262 for (i = 0; i < triplet->chans.num_channels; i++) { 1263 if (first_channel + i * chan_increment == chan) { 1264 have_chan_pwr = true; 1265 *chan_pwr = triplet->chans.max_power; 1266 break; 1267 } 1268 } 1269 if (have_chan_pwr) 1270 break; 1271 1272 next: 1273 triplet++; 1274 country_ie_len -= 3; 1275 } 1276 1277 if (have_chan_pwr && pwr_constr_elem) 1278 *pwr_reduction = *pwr_constr_elem; 1279 else 1280 *pwr_reduction = 0; 1281 1282 return have_chan_pwr; 1283 } 1284 1285 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1286 struct ieee80211_channel *channel, 1287 const u8 *cisco_dtpc_ie, 1288 int *pwr_level) 1289 { 1290 /* From practical testing, the first data byte of the DTPC element 1291 * seems to contain the requested dBm level, and the CLI on Cisco 1292 * APs clearly state the range is -127 to 127 dBm, which indicates 1293 * a signed byte, although it seemingly never actually goes negative. 1294 * The other byte seems to always be zero. 1295 */ 1296 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1297 } 1298 1299 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1300 struct ieee80211_channel *channel, 1301 struct ieee80211_mgmt *mgmt, 1302 const u8 *country_ie, u8 country_ie_len, 1303 const u8 *pwr_constr_ie, 1304 const u8 *cisco_dtpc_ie) 1305 { 1306 bool has_80211h_pwr = false, has_cisco_pwr = false; 1307 int chan_pwr = 0, pwr_reduction_80211h = 0; 1308 int pwr_level_cisco, pwr_level_80211h; 1309 int new_ap_level; 1310 __le16 capab = mgmt->u.probe_resp.capab_info; 1311 1312 if (country_ie && 1313 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1314 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1315 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1316 sdata, channel, country_ie, country_ie_len, 1317 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1318 pwr_level_80211h = 1319 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1320 } 1321 1322 if (cisco_dtpc_ie) { 1323 ieee80211_find_cisco_dtpc( 1324 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1325 has_cisco_pwr = true; 1326 } 1327 1328 if (!has_80211h_pwr && !has_cisco_pwr) 1329 return 0; 1330 1331 /* If we have both 802.11h and Cisco DTPC, apply both limits 1332 * by picking the smallest of the two power levels advertised. 1333 */ 1334 if (has_80211h_pwr && 1335 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1336 new_ap_level = pwr_level_80211h; 1337 1338 if (sdata->ap_power_level == new_ap_level) 1339 return 0; 1340 1341 sdata_dbg(sdata, 1342 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1343 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1344 sdata->u.mgd.bssid); 1345 } else { /* has_cisco_pwr is always true here. */ 1346 new_ap_level = pwr_level_cisco; 1347 1348 if (sdata->ap_power_level == new_ap_level) 1349 return 0; 1350 1351 sdata_dbg(sdata, 1352 "Limiting TX power to %d dBm as advertised by %pM\n", 1353 pwr_level_cisco, sdata->u.mgd.bssid); 1354 } 1355 1356 sdata->ap_power_level = new_ap_level; 1357 if (__ieee80211_recalc_txpower(sdata)) 1358 return BSS_CHANGED_TXPOWER; 1359 return 0; 1360 } 1361 1362 /* powersave */ 1363 static void ieee80211_enable_ps(struct ieee80211_local *local, 1364 struct ieee80211_sub_if_data *sdata) 1365 { 1366 struct ieee80211_conf *conf = &local->hw.conf; 1367 1368 /* 1369 * If we are scanning right now then the parameters will 1370 * take effect when scan finishes. 1371 */ 1372 if (local->scanning) 1373 return; 1374 1375 if (conf->dynamic_ps_timeout > 0 && 1376 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1377 mod_timer(&local->dynamic_ps_timer, jiffies + 1378 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1379 } else { 1380 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1381 ieee80211_send_nullfunc(local, sdata, true); 1382 1383 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1384 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1385 return; 1386 1387 conf->flags |= IEEE80211_CONF_PS; 1388 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1389 } 1390 } 1391 1392 static void ieee80211_change_ps(struct ieee80211_local *local) 1393 { 1394 struct ieee80211_conf *conf = &local->hw.conf; 1395 1396 if (local->ps_sdata) { 1397 ieee80211_enable_ps(local, local->ps_sdata); 1398 } else if (conf->flags & IEEE80211_CONF_PS) { 1399 conf->flags &= ~IEEE80211_CONF_PS; 1400 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1401 del_timer_sync(&local->dynamic_ps_timer); 1402 cancel_work_sync(&local->dynamic_ps_enable_work); 1403 } 1404 } 1405 1406 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1407 { 1408 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1409 struct sta_info *sta = NULL; 1410 bool authorized = false; 1411 1412 if (!mgd->powersave) 1413 return false; 1414 1415 if (mgd->broken_ap) 1416 return false; 1417 1418 if (!mgd->associated) 1419 return false; 1420 1421 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1422 return false; 1423 1424 if (!mgd->have_beacon) 1425 return false; 1426 1427 rcu_read_lock(); 1428 sta = sta_info_get(sdata, mgd->bssid); 1429 if (sta) 1430 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1431 rcu_read_unlock(); 1432 1433 return authorized; 1434 } 1435 1436 /* need to hold RTNL or interface lock */ 1437 void ieee80211_recalc_ps(struct ieee80211_local *local) 1438 { 1439 struct ieee80211_sub_if_data *sdata, *found = NULL; 1440 int count = 0; 1441 int timeout; 1442 1443 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1444 local->ps_sdata = NULL; 1445 return; 1446 } 1447 1448 list_for_each_entry(sdata, &local->interfaces, list) { 1449 if (!ieee80211_sdata_running(sdata)) 1450 continue; 1451 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1452 /* If an AP vif is found, then disable PS 1453 * by setting the count to zero thereby setting 1454 * ps_sdata to NULL. 1455 */ 1456 count = 0; 1457 break; 1458 } 1459 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1460 continue; 1461 found = sdata; 1462 count++; 1463 } 1464 1465 if (count == 1 && ieee80211_powersave_allowed(found)) { 1466 u8 dtimper = found->u.mgd.dtim_period; 1467 1468 timeout = local->dynamic_ps_forced_timeout; 1469 if (timeout < 0) 1470 timeout = 100; 1471 local->hw.conf.dynamic_ps_timeout = timeout; 1472 1473 /* If the TIM IE is invalid, pretend the value is 1 */ 1474 if (!dtimper) 1475 dtimper = 1; 1476 1477 local->hw.conf.ps_dtim_period = dtimper; 1478 local->ps_sdata = found; 1479 } else { 1480 local->ps_sdata = NULL; 1481 } 1482 1483 ieee80211_change_ps(local); 1484 } 1485 1486 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1487 { 1488 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1489 1490 if (sdata->vif.bss_conf.ps != ps_allowed) { 1491 sdata->vif.bss_conf.ps = ps_allowed; 1492 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1493 } 1494 } 1495 1496 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1497 { 1498 struct ieee80211_local *local = 1499 container_of(work, struct ieee80211_local, 1500 dynamic_ps_disable_work); 1501 1502 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1503 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1504 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1505 } 1506 1507 ieee80211_wake_queues_by_reason(&local->hw, 1508 IEEE80211_MAX_QUEUE_MAP, 1509 IEEE80211_QUEUE_STOP_REASON_PS, 1510 false); 1511 } 1512 1513 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1514 { 1515 struct ieee80211_local *local = 1516 container_of(work, struct ieee80211_local, 1517 dynamic_ps_enable_work); 1518 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1519 struct ieee80211_if_managed *ifmgd; 1520 unsigned long flags; 1521 int q; 1522 1523 /* can only happen when PS was just disabled anyway */ 1524 if (!sdata) 1525 return; 1526 1527 ifmgd = &sdata->u.mgd; 1528 1529 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1530 return; 1531 1532 if (local->hw.conf.dynamic_ps_timeout > 0) { 1533 /* don't enter PS if TX frames are pending */ 1534 if (drv_tx_frames_pending(local)) { 1535 mod_timer(&local->dynamic_ps_timer, jiffies + 1536 msecs_to_jiffies( 1537 local->hw.conf.dynamic_ps_timeout)); 1538 return; 1539 } 1540 1541 /* 1542 * transmission can be stopped by others which leads to 1543 * dynamic_ps_timer expiry. Postpone the ps timer if it 1544 * is not the actual idle state. 1545 */ 1546 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1547 for (q = 0; q < local->hw.queues; q++) { 1548 if (local->queue_stop_reasons[q]) { 1549 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1550 flags); 1551 mod_timer(&local->dynamic_ps_timer, jiffies + 1552 msecs_to_jiffies( 1553 local->hw.conf.dynamic_ps_timeout)); 1554 return; 1555 } 1556 } 1557 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1558 } 1559 1560 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1561 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1562 if (drv_tx_frames_pending(local)) { 1563 mod_timer(&local->dynamic_ps_timer, jiffies + 1564 msecs_to_jiffies( 1565 local->hw.conf.dynamic_ps_timeout)); 1566 } else { 1567 ieee80211_send_nullfunc(local, sdata, true); 1568 /* Flush to get the tx status of nullfunc frame */ 1569 ieee80211_flush_queues(local, sdata, false); 1570 } 1571 } 1572 1573 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1574 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1575 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1576 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1577 local->hw.conf.flags |= IEEE80211_CONF_PS; 1578 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1579 } 1580 } 1581 1582 void ieee80211_dynamic_ps_timer(struct timer_list *t) 1583 { 1584 struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer); 1585 1586 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1587 } 1588 1589 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1590 { 1591 struct delayed_work *delayed_work = to_delayed_work(work); 1592 struct ieee80211_sub_if_data *sdata = 1593 container_of(delayed_work, struct ieee80211_sub_if_data, 1594 dfs_cac_timer_work); 1595 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1596 1597 mutex_lock(&sdata->local->mtx); 1598 if (sdata->wdev.cac_started) { 1599 ieee80211_vif_release_channel(sdata); 1600 cfg80211_cac_event(sdata->dev, &chandef, 1601 NL80211_RADAR_CAC_FINISHED, 1602 GFP_KERNEL); 1603 } 1604 mutex_unlock(&sdata->local->mtx); 1605 } 1606 1607 static bool 1608 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1609 { 1610 struct ieee80211_local *local = sdata->local; 1611 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1612 bool ret = false; 1613 int ac; 1614 1615 if (local->hw.queues < IEEE80211_NUM_ACS) 1616 return false; 1617 1618 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1619 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1620 int non_acm_ac; 1621 unsigned long now = jiffies; 1622 1623 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1624 tx_tspec->admitted_time && 1625 time_after(now, tx_tspec->time_slice_start + HZ)) { 1626 tx_tspec->consumed_tx_time = 0; 1627 tx_tspec->time_slice_start = now; 1628 1629 if (tx_tspec->downgraded) 1630 tx_tspec->action = 1631 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1632 } 1633 1634 switch (tx_tspec->action) { 1635 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1636 /* take the original parameters */ 1637 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1638 sdata_err(sdata, 1639 "failed to set TX queue parameters for queue %d\n", 1640 ac); 1641 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1642 tx_tspec->downgraded = false; 1643 ret = true; 1644 break; 1645 case TX_TSPEC_ACTION_DOWNGRADE: 1646 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1647 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1648 ret = true; 1649 break; 1650 } 1651 /* downgrade next lower non-ACM AC */ 1652 for (non_acm_ac = ac + 1; 1653 non_acm_ac < IEEE80211_NUM_ACS; 1654 non_acm_ac++) 1655 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1656 break; 1657 /* Usually the loop will result in using BK even if it 1658 * requires admission control, but such a configuration 1659 * makes no sense and we have to transmit somehow - the 1660 * AC selection does the same thing. 1661 * If we started out trying to downgrade from BK, then 1662 * the extra condition here might be needed. 1663 */ 1664 if (non_acm_ac >= IEEE80211_NUM_ACS) 1665 non_acm_ac = IEEE80211_AC_BK; 1666 if (drv_conf_tx(local, sdata, ac, 1667 &sdata->tx_conf[non_acm_ac])) 1668 sdata_err(sdata, 1669 "failed to set TX queue parameters for queue %d\n", 1670 ac); 1671 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1672 ret = true; 1673 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1674 tx_tspec->time_slice_start + HZ - now + 1); 1675 break; 1676 case TX_TSPEC_ACTION_NONE: 1677 /* nothing now */ 1678 break; 1679 } 1680 } 1681 1682 return ret; 1683 } 1684 1685 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1686 { 1687 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1688 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1689 } 1690 1691 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1692 { 1693 struct ieee80211_sub_if_data *sdata; 1694 1695 sdata = container_of(work, struct ieee80211_sub_if_data, 1696 u.mgd.tx_tspec_wk.work); 1697 ieee80211_sta_handle_tspec_ac_params(sdata); 1698 } 1699 1700 /* MLME */ 1701 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1702 struct ieee80211_sub_if_data *sdata, 1703 const u8 *wmm_param, size_t wmm_param_len) 1704 { 1705 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1706 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1707 size_t left; 1708 int count, ac; 1709 const u8 *pos; 1710 u8 uapsd_queues = 0; 1711 1712 if (!local->ops->conf_tx) 1713 return false; 1714 1715 if (local->hw.queues < IEEE80211_NUM_ACS) 1716 return false; 1717 1718 if (!wmm_param) 1719 return false; 1720 1721 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1722 return false; 1723 1724 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1725 uapsd_queues = ifmgd->uapsd_queues; 1726 1727 count = wmm_param[6] & 0x0f; 1728 if (count == ifmgd->wmm_last_param_set) 1729 return false; 1730 ifmgd->wmm_last_param_set = count; 1731 1732 pos = wmm_param + 8; 1733 left = wmm_param_len - 8; 1734 1735 memset(¶ms, 0, sizeof(params)); 1736 1737 sdata->wmm_acm = 0; 1738 for (; left >= 4; left -= 4, pos += 4) { 1739 int aci = (pos[0] >> 5) & 0x03; 1740 int acm = (pos[0] >> 4) & 0x01; 1741 bool uapsd = false; 1742 1743 switch (aci) { 1744 case 1: /* AC_BK */ 1745 ac = IEEE80211_AC_BK; 1746 if (acm) 1747 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1748 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1749 uapsd = true; 1750 break; 1751 case 2: /* AC_VI */ 1752 ac = IEEE80211_AC_VI; 1753 if (acm) 1754 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1755 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1756 uapsd = true; 1757 break; 1758 case 3: /* AC_VO */ 1759 ac = IEEE80211_AC_VO; 1760 if (acm) 1761 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1762 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1763 uapsd = true; 1764 break; 1765 case 0: /* AC_BE */ 1766 default: 1767 ac = IEEE80211_AC_BE; 1768 if (acm) 1769 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1770 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1771 uapsd = true; 1772 break; 1773 } 1774 1775 params[ac].aifs = pos[0] & 0x0f; 1776 1777 if (params[ac].aifs < 2) { 1778 sdata_info(sdata, 1779 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1780 params[ac].aifs, aci); 1781 params[ac].aifs = 2; 1782 } 1783 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1784 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1785 params[ac].txop = get_unaligned_le16(pos + 2); 1786 params[ac].acm = acm; 1787 params[ac].uapsd = uapsd; 1788 1789 if (params[ac].cw_min > params[ac].cw_max) { 1790 sdata_info(sdata, 1791 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1792 params[ac].cw_min, params[ac].cw_max, aci); 1793 return false; 1794 } 1795 } 1796 1797 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1798 mlme_dbg(sdata, 1799 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1800 ac, params[ac].acm, 1801 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1802 params[ac].txop, params[ac].uapsd, 1803 ifmgd->tx_tspec[ac].downgraded); 1804 sdata->tx_conf[ac] = params[ac]; 1805 if (!ifmgd->tx_tspec[ac].downgraded && 1806 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1807 sdata_err(sdata, 1808 "failed to set TX queue parameters for AC %d\n", 1809 ac); 1810 } 1811 1812 /* enable WMM or activate new settings */ 1813 sdata->vif.bss_conf.qos = true; 1814 return true; 1815 } 1816 1817 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1818 { 1819 lockdep_assert_held(&sdata->local->mtx); 1820 1821 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1822 ieee80211_run_deferred_scan(sdata->local); 1823 } 1824 1825 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1826 { 1827 mutex_lock(&sdata->local->mtx); 1828 __ieee80211_stop_poll(sdata); 1829 mutex_unlock(&sdata->local->mtx); 1830 } 1831 1832 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1833 u16 capab, bool erp_valid, u8 erp) 1834 { 1835 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1836 struct ieee80211_supported_band *sband; 1837 u32 changed = 0; 1838 bool use_protection; 1839 bool use_short_preamble; 1840 bool use_short_slot; 1841 1842 sband = ieee80211_get_sband(sdata); 1843 if (!sband) 1844 return changed; 1845 1846 if (erp_valid) { 1847 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1848 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1849 } else { 1850 use_protection = false; 1851 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1852 } 1853 1854 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1855 if (sband->band == NL80211_BAND_5GHZ) 1856 use_short_slot = true; 1857 1858 if (use_protection != bss_conf->use_cts_prot) { 1859 bss_conf->use_cts_prot = use_protection; 1860 changed |= BSS_CHANGED_ERP_CTS_PROT; 1861 } 1862 1863 if (use_short_preamble != bss_conf->use_short_preamble) { 1864 bss_conf->use_short_preamble = use_short_preamble; 1865 changed |= BSS_CHANGED_ERP_PREAMBLE; 1866 } 1867 1868 if (use_short_slot != bss_conf->use_short_slot) { 1869 bss_conf->use_short_slot = use_short_slot; 1870 changed |= BSS_CHANGED_ERP_SLOT; 1871 } 1872 1873 return changed; 1874 } 1875 1876 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1877 struct cfg80211_bss *cbss, 1878 u32 bss_info_changed) 1879 { 1880 struct ieee80211_bss *bss = (void *)cbss->priv; 1881 struct ieee80211_local *local = sdata->local; 1882 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1883 1884 bss_info_changed |= BSS_CHANGED_ASSOC; 1885 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1886 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1887 1888 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1889 beacon_loss_count * bss_conf->beacon_int)); 1890 1891 sdata->u.mgd.associated = cbss; 1892 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1893 1894 ieee80211_check_rate_mask(sdata); 1895 1896 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1897 1898 if (sdata->vif.p2p || 1899 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1900 const struct cfg80211_bss_ies *ies; 1901 1902 rcu_read_lock(); 1903 ies = rcu_dereference(cbss->ies); 1904 if (ies) { 1905 int ret; 1906 1907 ret = cfg80211_get_p2p_attr( 1908 ies->data, ies->len, 1909 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1910 (u8 *) &bss_conf->p2p_noa_attr, 1911 sizeof(bss_conf->p2p_noa_attr)); 1912 if (ret >= 2) { 1913 sdata->u.mgd.p2p_noa_index = 1914 bss_conf->p2p_noa_attr.index; 1915 bss_info_changed |= BSS_CHANGED_P2P_PS; 1916 } 1917 } 1918 rcu_read_unlock(); 1919 } 1920 1921 /* just to be sure */ 1922 ieee80211_stop_poll(sdata); 1923 1924 ieee80211_led_assoc(local, 1); 1925 1926 if (sdata->u.mgd.have_beacon) { 1927 /* 1928 * If the AP is buggy we may get here with no DTIM period 1929 * known, so assume it's 1 which is the only safe assumption 1930 * in that case, although if the TIM IE is broken powersave 1931 * probably just won't work at all. 1932 */ 1933 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1934 bss_conf->beacon_rate = bss->beacon_rate; 1935 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1936 } else { 1937 bss_conf->beacon_rate = NULL; 1938 bss_conf->dtim_period = 0; 1939 } 1940 1941 bss_conf->assoc = 1; 1942 1943 /* Tell the driver to monitor connection quality (if supported) */ 1944 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1945 bss_conf->cqm_rssi_thold) 1946 bss_info_changed |= BSS_CHANGED_CQM; 1947 1948 /* Enable ARP filtering */ 1949 if (bss_conf->arp_addr_cnt) 1950 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1951 1952 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1953 1954 mutex_lock(&local->iflist_mtx); 1955 ieee80211_recalc_ps(local); 1956 mutex_unlock(&local->iflist_mtx); 1957 1958 ieee80211_recalc_smps(sdata); 1959 ieee80211_recalc_ps_vif(sdata); 1960 1961 netif_carrier_on(sdata->dev); 1962 } 1963 1964 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1965 u16 stype, u16 reason, bool tx, 1966 u8 *frame_buf) 1967 { 1968 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1969 struct ieee80211_local *local = sdata->local; 1970 u32 changed = 0; 1971 1972 sdata_assert_lock(sdata); 1973 1974 if (WARN_ON_ONCE(tx && !frame_buf)) 1975 return; 1976 1977 if (WARN_ON(!ifmgd->associated)) 1978 return; 1979 1980 ieee80211_stop_poll(sdata); 1981 1982 ifmgd->associated = NULL; 1983 netif_carrier_off(sdata->dev); 1984 1985 /* 1986 * if we want to get out of ps before disassoc (why?) we have 1987 * to do it before sending disassoc, as otherwise the null-packet 1988 * won't be valid. 1989 */ 1990 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1991 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1992 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1993 } 1994 local->ps_sdata = NULL; 1995 1996 /* disable per-vif ps */ 1997 ieee80211_recalc_ps_vif(sdata); 1998 1999 /* make sure ongoing transmission finishes */ 2000 synchronize_net(); 2001 2002 /* 2003 * drop any frame before deauth/disassoc, this can be data or 2004 * management frame. Since we are disconnecting, we should not 2005 * insist sending these frames which can take time and delay 2006 * the disconnection and possible the roaming. 2007 */ 2008 if (tx) 2009 ieee80211_flush_queues(local, sdata, true); 2010 2011 /* deauthenticate/disassociate now */ 2012 if (tx || frame_buf) 2013 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2014 reason, tx, frame_buf); 2015 2016 /* flush out frame - make sure the deauth was actually sent */ 2017 if (tx) 2018 ieee80211_flush_queues(local, sdata, false); 2019 2020 /* clear bssid only after building the needed mgmt frames */ 2021 eth_zero_addr(ifmgd->bssid); 2022 2023 /* remove AP and TDLS peers */ 2024 sta_info_flush(sdata); 2025 2026 /* finally reset all BSS / config parameters */ 2027 changed |= ieee80211_reset_erp_info(sdata); 2028 2029 ieee80211_led_assoc(local, 0); 2030 changed |= BSS_CHANGED_ASSOC; 2031 sdata->vif.bss_conf.assoc = false; 2032 2033 ifmgd->p2p_noa_index = -1; 2034 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2035 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2036 2037 /* on the next assoc, re-program HT/VHT parameters */ 2038 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2039 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2040 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2041 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2042 2043 /* reset MU-MIMO ownership and group data */ 2044 memset(sdata->vif.bss_conf.mu_group.membership, 0, 2045 sizeof(sdata->vif.bss_conf.mu_group.membership)); 2046 memset(sdata->vif.bss_conf.mu_group.position, 0, 2047 sizeof(sdata->vif.bss_conf.mu_group.position)); 2048 changed |= BSS_CHANGED_MU_GROUPS; 2049 sdata->vif.mu_mimo_owner = false; 2050 2051 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2052 2053 del_timer_sync(&local->dynamic_ps_timer); 2054 cancel_work_sync(&local->dynamic_ps_enable_work); 2055 2056 /* Disable ARP filtering */ 2057 if (sdata->vif.bss_conf.arp_addr_cnt) 2058 changed |= BSS_CHANGED_ARP_FILTER; 2059 2060 sdata->vif.bss_conf.qos = false; 2061 changed |= BSS_CHANGED_QOS; 2062 2063 /* The BSSID (not really interesting) and HT changed */ 2064 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2065 ieee80211_bss_info_change_notify(sdata, changed); 2066 2067 /* disassociated - set to defaults now */ 2068 ieee80211_set_wmm_default(sdata, false, false); 2069 2070 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2071 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2072 del_timer_sync(&sdata->u.mgd.timer); 2073 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2074 2075 sdata->vif.bss_conf.dtim_period = 0; 2076 sdata->vif.bss_conf.beacon_rate = NULL; 2077 2078 ifmgd->have_beacon = false; 2079 2080 ifmgd->flags = 0; 2081 mutex_lock(&local->mtx); 2082 ieee80211_vif_release_channel(sdata); 2083 2084 sdata->vif.csa_active = false; 2085 ifmgd->csa_waiting_bcn = false; 2086 ifmgd->csa_ignored_same_chan = false; 2087 if (sdata->csa_block_tx) { 2088 ieee80211_wake_vif_queues(local, sdata, 2089 IEEE80211_QUEUE_STOP_REASON_CSA); 2090 sdata->csa_block_tx = false; 2091 } 2092 mutex_unlock(&local->mtx); 2093 2094 /* existing TX TSPEC sessions no longer exist */ 2095 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2096 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2097 2098 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2099 } 2100 2101 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2102 struct ieee80211_hdr *hdr) 2103 { 2104 /* 2105 * We can postpone the mgd.timer whenever receiving unicast frames 2106 * from AP because we know that the connection is working both ways 2107 * at that time. But multicast frames (and hence also beacons) must 2108 * be ignored here, because we need to trigger the timer during 2109 * data idle periods for sending the periodic probe request to the 2110 * AP we're connected to. 2111 */ 2112 if (is_multicast_ether_addr(hdr->addr1)) 2113 return; 2114 2115 ieee80211_sta_reset_conn_monitor(sdata); 2116 } 2117 2118 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2119 { 2120 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2121 struct ieee80211_local *local = sdata->local; 2122 2123 mutex_lock(&local->mtx); 2124 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2125 goto out; 2126 2127 __ieee80211_stop_poll(sdata); 2128 2129 mutex_lock(&local->iflist_mtx); 2130 ieee80211_recalc_ps(local); 2131 mutex_unlock(&local->iflist_mtx); 2132 2133 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2134 goto out; 2135 2136 /* 2137 * We've received a probe response, but are not sure whether 2138 * we have or will be receiving any beacons or data, so let's 2139 * schedule the timers again, just in case. 2140 */ 2141 ieee80211_sta_reset_beacon_monitor(sdata); 2142 2143 mod_timer(&ifmgd->conn_mon_timer, 2144 round_jiffies_up(jiffies + 2145 IEEE80211_CONNECTION_IDLE_TIME)); 2146 out: 2147 mutex_unlock(&local->mtx); 2148 } 2149 2150 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2151 struct ieee80211_hdr *hdr, 2152 u16 tx_time) 2153 { 2154 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2155 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2156 int ac = ieee80211_ac_from_tid(tid); 2157 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2158 unsigned long now = jiffies; 2159 2160 if (likely(!tx_tspec->admitted_time)) 2161 return; 2162 2163 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2164 tx_tspec->consumed_tx_time = 0; 2165 tx_tspec->time_slice_start = now; 2166 2167 if (tx_tspec->downgraded) { 2168 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2169 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2170 } 2171 } 2172 2173 if (tx_tspec->downgraded) 2174 return; 2175 2176 tx_tspec->consumed_tx_time += tx_time; 2177 2178 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2179 tx_tspec->downgraded = true; 2180 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2181 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2182 } 2183 } 2184 2185 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2186 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2187 { 2188 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2189 2190 if (!ieee80211_is_data(hdr->frame_control)) 2191 return; 2192 2193 if (ieee80211_is_nullfunc(hdr->frame_control) && 2194 sdata->u.mgd.probe_send_count > 0) { 2195 if (ack) 2196 ieee80211_sta_reset_conn_monitor(sdata); 2197 else 2198 sdata->u.mgd.nullfunc_failed = true; 2199 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2200 return; 2201 } 2202 2203 if (ack) 2204 ieee80211_sta_reset_conn_monitor(sdata); 2205 } 2206 2207 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2208 { 2209 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2210 const u8 *ssid; 2211 u8 *dst = ifmgd->associated->bssid; 2212 u8 unicast_limit = max(1, max_probe_tries - 3); 2213 struct sta_info *sta; 2214 2215 /* 2216 * Try sending broadcast probe requests for the last three 2217 * probe requests after the first ones failed since some 2218 * buggy APs only support broadcast probe requests. 2219 */ 2220 if (ifmgd->probe_send_count >= unicast_limit) 2221 dst = NULL; 2222 2223 /* 2224 * When the hardware reports an accurate Tx ACK status, it's 2225 * better to send a nullfunc frame instead of a probe request, 2226 * as it will kick us off the AP quickly if we aren't associated 2227 * anymore. The timeout will be reset if the frame is ACKed by 2228 * the AP. 2229 */ 2230 ifmgd->probe_send_count++; 2231 2232 if (dst) { 2233 mutex_lock(&sdata->local->sta_mtx); 2234 sta = sta_info_get(sdata, dst); 2235 if (!WARN_ON(!sta)) 2236 ieee80211_check_fast_rx(sta); 2237 mutex_unlock(&sdata->local->sta_mtx); 2238 } 2239 2240 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2241 ifmgd->nullfunc_failed = false; 2242 ieee80211_send_nullfunc(sdata->local, sdata, false); 2243 } else { 2244 int ssid_len; 2245 2246 rcu_read_lock(); 2247 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2248 if (WARN_ON_ONCE(ssid == NULL)) 2249 ssid_len = 0; 2250 else 2251 ssid_len = ssid[1]; 2252 2253 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2254 ssid + 2, ssid_len, NULL, 2255 0, (u32) -1, true, 0, 2256 ifmgd->associated->channel, false); 2257 rcu_read_unlock(); 2258 } 2259 2260 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2261 run_again(sdata, ifmgd->probe_timeout); 2262 } 2263 2264 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2265 bool beacon) 2266 { 2267 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2268 bool already = false; 2269 2270 if (!ieee80211_sdata_running(sdata)) 2271 return; 2272 2273 sdata_lock(sdata); 2274 2275 if (!ifmgd->associated) 2276 goto out; 2277 2278 mutex_lock(&sdata->local->mtx); 2279 2280 if (sdata->local->tmp_channel || sdata->local->scanning) { 2281 mutex_unlock(&sdata->local->mtx); 2282 goto out; 2283 } 2284 2285 if (beacon) { 2286 mlme_dbg_ratelimited(sdata, 2287 "detected beacon loss from AP (missed %d beacons) - probing\n", 2288 beacon_loss_count); 2289 2290 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2291 } 2292 2293 /* 2294 * The driver/our work has already reported this event or the 2295 * connection monitoring has kicked in and we have already sent 2296 * a probe request. Or maybe the AP died and the driver keeps 2297 * reporting until we disassociate... 2298 * 2299 * In either case we have to ignore the current call to this 2300 * function (except for setting the correct probe reason bit) 2301 * because otherwise we would reset the timer every time and 2302 * never check whether we received a probe response! 2303 */ 2304 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2305 already = true; 2306 2307 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2308 2309 mutex_unlock(&sdata->local->mtx); 2310 2311 if (already) 2312 goto out; 2313 2314 mutex_lock(&sdata->local->iflist_mtx); 2315 ieee80211_recalc_ps(sdata->local); 2316 mutex_unlock(&sdata->local->iflist_mtx); 2317 2318 ifmgd->probe_send_count = 0; 2319 ieee80211_mgd_probe_ap_send(sdata); 2320 out: 2321 sdata_unlock(sdata); 2322 } 2323 2324 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2325 struct ieee80211_vif *vif) 2326 { 2327 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2328 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2329 struct cfg80211_bss *cbss; 2330 struct sk_buff *skb; 2331 const u8 *ssid; 2332 int ssid_len; 2333 2334 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2335 return NULL; 2336 2337 sdata_assert_lock(sdata); 2338 2339 if (ifmgd->associated) 2340 cbss = ifmgd->associated; 2341 else if (ifmgd->auth_data) 2342 cbss = ifmgd->auth_data->bss; 2343 else if (ifmgd->assoc_data) 2344 cbss = ifmgd->assoc_data->bss; 2345 else 2346 return NULL; 2347 2348 rcu_read_lock(); 2349 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2350 if (WARN_ON_ONCE(ssid == NULL)) 2351 ssid_len = 0; 2352 else 2353 ssid_len = ssid[1]; 2354 2355 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2356 (u32) -1, cbss->channel, 2357 ssid + 2, ssid_len, 2358 NULL, 0, true); 2359 rcu_read_unlock(); 2360 2361 return skb; 2362 } 2363 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2364 2365 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2366 const u8 *buf, size_t len, bool tx, 2367 u16 reason) 2368 { 2369 struct ieee80211_event event = { 2370 .type = MLME_EVENT, 2371 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2372 .u.mlme.reason = reason, 2373 }; 2374 2375 if (tx) 2376 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2377 else 2378 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2379 2380 drv_event_callback(sdata->local, sdata, &event); 2381 } 2382 2383 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2384 { 2385 struct ieee80211_local *local = sdata->local; 2386 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2387 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2388 2389 sdata_lock(sdata); 2390 if (!ifmgd->associated) { 2391 sdata_unlock(sdata); 2392 return; 2393 } 2394 2395 /* AP is probably out of range (or not reachable for another reason) so 2396 * remove the bss struct for that AP. 2397 */ 2398 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated); 2399 2400 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2401 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2402 true, frame_buf); 2403 mutex_lock(&local->mtx); 2404 sdata->vif.csa_active = false; 2405 ifmgd->csa_waiting_bcn = false; 2406 if (sdata->csa_block_tx) { 2407 ieee80211_wake_vif_queues(local, sdata, 2408 IEEE80211_QUEUE_STOP_REASON_CSA); 2409 sdata->csa_block_tx = false; 2410 } 2411 mutex_unlock(&local->mtx); 2412 2413 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2414 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2415 2416 sdata_unlock(sdata); 2417 } 2418 2419 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2420 { 2421 struct ieee80211_sub_if_data *sdata = 2422 container_of(work, struct ieee80211_sub_if_data, 2423 u.mgd.beacon_connection_loss_work); 2424 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2425 2426 if (ifmgd->associated) 2427 ifmgd->beacon_loss_count++; 2428 2429 if (ifmgd->connection_loss) { 2430 sdata_info(sdata, "Connection to AP %pM lost\n", 2431 ifmgd->bssid); 2432 __ieee80211_disconnect(sdata); 2433 } else { 2434 ieee80211_mgd_probe_ap(sdata, true); 2435 } 2436 } 2437 2438 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2439 { 2440 struct ieee80211_sub_if_data *sdata = 2441 container_of(work, struct ieee80211_sub_if_data, 2442 u.mgd.csa_connection_drop_work); 2443 2444 __ieee80211_disconnect(sdata); 2445 } 2446 2447 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2448 { 2449 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2450 struct ieee80211_hw *hw = &sdata->local->hw; 2451 2452 trace_api_beacon_loss(sdata); 2453 2454 sdata->u.mgd.connection_loss = false; 2455 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2456 } 2457 EXPORT_SYMBOL(ieee80211_beacon_loss); 2458 2459 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2460 { 2461 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2462 struct ieee80211_hw *hw = &sdata->local->hw; 2463 2464 trace_api_connection_loss(sdata); 2465 2466 sdata->u.mgd.connection_loss = true; 2467 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2468 } 2469 EXPORT_SYMBOL(ieee80211_connection_loss); 2470 2471 2472 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2473 bool assoc) 2474 { 2475 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2476 2477 sdata_assert_lock(sdata); 2478 2479 if (!assoc) { 2480 /* 2481 * we are not authenticated yet, the only timer that could be 2482 * running is the timeout for the authentication response which 2483 * which is not relevant anymore. 2484 */ 2485 del_timer_sync(&sdata->u.mgd.timer); 2486 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2487 2488 eth_zero_addr(sdata->u.mgd.bssid); 2489 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2490 sdata->u.mgd.flags = 0; 2491 mutex_lock(&sdata->local->mtx); 2492 ieee80211_vif_release_channel(sdata); 2493 mutex_unlock(&sdata->local->mtx); 2494 } 2495 2496 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2497 kfree(auth_data); 2498 sdata->u.mgd.auth_data = NULL; 2499 } 2500 2501 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2502 bool assoc, bool abandon) 2503 { 2504 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2505 2506 sdata_assert_lock(sdata); 2507 2508 if (!assoc) { 2509 /* 2510 * we are not associated yet, the only timer that could be 2511 * running is the timeout for the association response which 2512 * which is not relevant anymore. 2513 */ 2514 del_timer_sync(&sdata->u.mgd.timer); 2515 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2516 2517 eth_zero_addr(sdata->u.mgd.bssid); 2518 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2519 sdata->u.mgd.flags = 0; 2520 sdata->vif.mu_mimo_owner = false; 2521 2522 mutex_lock(&sdata->local->mtx); 2523 ieee80211_vif_release_channel(sdata); 2524 mutex_unlock(&sdata->local->mtx); 2525 2526 if (abandon) 2527 cfg80211_abandon_assoc(sdata->dev, assoc_data->bss); 2528 } 2529 2530 kfree(assoc_data); 2531 sdata->u.mgd.assoc_data = NULL; 2532 } 2533 2534 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2535 struct ieee80211_mgmt *mgmt, size_t len) 2536 { 2537 struct ieee80211_local *local = sdata->local; 2538 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2539 u8 *pos; 2540 struct ieee802_11_elems elems; 2541 u32 tx_flags = 0; 2542 2543 pos = mgmt->u.auth.variable; 2544 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2545 if (!elems.challenge) 2546 return; 2547 auth_data->expected_transaction = 4; 2548 drv_mgd_prepare_tx(sdata->local, sdata); 2549 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2550 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2551 IEEE80211_TX_INTFL_MLME_CONN_TX; 2552 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2553 elems.challenge - 2, elems.challenge_len + 2, 2554 auth_data->bss->bssid, auth_data->bss->bssid, 2555 auth_data->key, auth_data->key_len, 2556 auth_data->key_idx, tx_flags); 2557 } 2558 2559 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2560 struct ieee80211_mgmt *mgmt, size_t len) 2561 { 2562 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2563 u8 bssid[ETH_ALEN]; 2564 u16 auth_alg, auth_transaction, status_code; 2565 struct sta_info *sta; 2566 struct ieee80211_event event = { 2567 .type = MLME_EVENT, 2568 .u.mlme.data = AUTH_EVENT, 2569 }; 2570 2571 sdata_assert_lock(sdata); 2572 2573 if (len < 24 + 6) 2574 return; 2575 2576 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2577 return; 2578 2579 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2580 2581 if (!ether_addr_equal(bssid, mgmt->bssid)) 2582 return; 2583 2584 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2585 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2586 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2587 2588 if (auth_alg != ifmgd->auth_data->algorithm || 2589 auth_transaction != ifmgd->auth_data->expected_transaction) { 2590 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2591 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2592 auth_transaction, 2593 ifmgd->auth_data->expected_transaction); 2594 return; 2595 } 2596 2597 if (status_code != WLAN_STATUS_SUCCESS) { 2598 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2599 mgmt->sa, status_code); 2600 ieee80211_destroy_auth_data(sdata, false); 2601 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2602 event.u.mlme.status = MLME_DENIED; 2603 event.u.mlme.reason = status_code; 2604 drv_event_callback(sdata->local, sdata, &event); 2605 return; 2606 } 2607 2608 switch (ifmgd->auth_data->algorithm) { 2609 case WLAN_AUTH_OPEN: 2610 case WLAN_AUTH_LEAP: 2611 case WLAN_AUTH_FT: 2612 case WLAN_AUTH_SAE: 2613 case WLAN_AUTH_FILS_SK: 2614 case WLAN_AUTH_FILS_SK_PFS: 2615 case WLAN_AUTH_FILS_PK: 2616 break; 2617 case WLAN_AUTH_SHARED_KEY: 2618 if (ifmgd->auth_data->expected_transaction != 4) { 2619 ieee80211_auth_challenge(sdata, mgmt, len); 2620 /* need another frame */ 2621 return; 2622 } 2623 break; 2624 default: 2625 WARN_ONCE(1, "invalid auth alg %d", 2626 ifmgd->auth_data->algorithm); 2627 return; 2628 } 2629 2630 event.u.mlme.status = MLME_SUCCESS; 2631 drv_event_callback(sdata->local, sdata, &event); 2632 sdata_info(sdata, "authenticated\n"); 2633 ifmgd->auth_data->done = true; 2634 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2635 ifmgd->auth_data->timeout_started = true; 2636 run_again(sdata, ifmgd->auth_data->timeout); 2637 2638 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2639 ifmgd->auth_data->expected_transaction != 2) { 2640 /* 2641 * Report auth frame to user space for processing since another 2642 * round of Authentication frames is still needed. 2643 */ 2644 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2645 return; 2646 } 2647 2648 /* move station state to auth */ 2649 mutex_lock(&sdata->local->sta_mtx); 2650 sta = sta_info_get(sdata, bssid); 2651 if (!sta) { 2652 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2653 goto out_err; 2654 } 2655 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2656 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2657 goto out_err; 2658 } 2659 mutex_unlock(&sdata->local->sta_mtx); 2660 2661 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2662 return; 2663 out_err: 2664 mutex_unlock(&sdata->local->sta_mtx); 2665 /* ignore frame -- wait for timeout */ 2666 } 2667 2668 #define case_WLAN(type) \ 2669 case WLAN_REASON_##type: return #type 2670 2671 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2672 { 2673 switch (reason_code) { 2674 case_WLAN(UNSPECIFIED); 2675 case_WLAN(PREV_AUTH_NOT_VALID); 2676 case_WLAN(DEAUTH_LEAVING); 2677 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2678 case_WLAN(DISASSOC_AP_BUSY); 2679 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2680 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2681 case_WLAN(DISASSOC_STA_HAS_LEFT); 2682 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2683 case_WLAN(DISASSOC_BAD_POWER); 2684 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2685 case_WLAN(INVALID_IE); 2686 case_WLAN(MIC_FAILURE); 2687 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2688 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2689 case_WLAN(IE_DIFFERENT); 2690 case_WLAN(INVALID_GROUP_CIPHER); 2691 case_WLAN(INVALID_PAIRWISE_CIPHER); 2692 case_WLAN(INVALID_AKMP); 2693 case_WLAN(UNSUPP_RSN_VERSION); 2694 case_WLAN(INVALID_RSN_IE_CAP); 2695 case_WLAN(IEEE8021X_FAILED); 2696 case_WLAN(CIPHER_SUITE_REJECTED); 2697 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2698 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2699 case_WLAN(DISASSOC_LOW_ACK); 2700 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2701 case_WLAN(QSTA_LEAVE_QBSS); 2702 case_WLAN(QSTA_NOT_USE); 2703 case_WLAN(QSTA_REQUIRE_SETUP); 2704 case_WLAN(QSTA_TIMEOUT); 2705 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2706 case_WLAN(MESH_PEER_CANCELED); 2707 case_WLAN(MESH_MAX_PEERS); 2708 case_WLAN(MESH_CONFIG); 2709 case_WLAN(MESH_CLOSE); 2710 case_WLAN(MESH_MAX_RETRIES); 2711 case_WLAN(MESH_CONFIRM_TIMEOUT); 2712 case_WLAN(MESH_INVALID_GTK); 2713 case_WLAN(MESH_INCONSISTENT_PARAM); 2714 case_WLAN(MESH_INVALID_SECURITY); 2715 case_WLAN(MESH_PATH_ERROR); 2716 case_WLAN(MESH_PATH_NOFORWARD); 2717 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2718 case_WLAN(MAC_EXISTS_IN_MBSS); 2719 case_WLAN(MESH_CHAN_REGULATORY); 2720 case_WLAN(MESH_CHAN); 2721 default: return "<unknown>"; 2722 } 2723 } 2724 2725 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2726 struct ieee80211_mgmt *mgmt, size_t len) 2727 { 2728 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2729 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2730 2731 sdata_assert_lock(sdata); 2732 2733 if (len < 24 + 2) 2734 return; 2735 2736 if (ifmgd->associated && 2737 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2738 const u8 *bssid = ifmgd->associated->bssid; 2739 2740 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2741 bssid, reason_code, 2742 ieee80211_get_reason_code_string(reason_code)); 2743 2744 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2745 2746 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2747 reason_code); 2748 return; 2749 } 2750 2751 if (ifmgd->assoc_data && 2752 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2753 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2754 2755 sdata_info(sdata, 2756 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2757 bssid, reason_code, 2758 ieee80211_get_reason_code_string(reason_code)); 2759 2760 ieee80211_destroy_assoc_data(sdata, false, true); 2761 2762 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2763 return; 2764 } 2765 } 2766 2767 2768 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2769 struct ieee80211_mgmt *mgmt, size_t len) 2770 { 2771 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2772 u16 reason_code; 2773 2774 sdata_assert_lock(sdata); 2775 2776 if (len < 24 + 2) 2777 return; 2778 2779 if (!ifmgd->associated || 2780 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2781 return; 2782 2783 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2784 2785 sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n", 2786 mgmt->sa, reason_code, 2787 ieee80211_get_reason_code_string(reason_code)); 2788 2789 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2790 2791 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2792 } 2793 2794 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2795 u8 *supp_rates, unsigned int supp_rates_len, 2796 u32 *rates, u32 *basic_rates, 2797 bool *have_higher_than_11mbit, 2798 int *min_rate, int *min_rate_index, 2799 int shift) 2800 { 2801 int i, j; 2802 2803 for (i = 0; i < supp_rates_len; i++) { 2804 int rate = supp_rates[i] & 0x7f; 2805 bool is_basic = !!(supp_rates[i] & 0x80); 2806 2807 if ((rate * 5 * (1 << shift)) > 110) 2808 *have_higher_than_11mbit = true; 2809 2810 /* 2811 * Skip HT and VHT BSS membership selectors since they're not 2812 * rates. 2813 * 2814 * Note: Even though the membership selector and the basic 2815 * rate flag share the same bit, they are not exactly 2816 * the same. 2817 */ 2818 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) || 2819 supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY)) 2820 continue; 2821 2822 for (j = 0; j < sband->n_bitrates; j++) { 2823 struct ieee80211_rate *br; 2824 int brate; 2825 2826 br = &sband->bitrates[j]; 2827 2828 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2829 if (brate == rate) { 2830 *rates |= BIT(j); 2831 if (is_basic) 2832 *basic_rates |= BIT(j); 2833 if ((rate * 5) < *min_rate) { 2834 *min_rate = rate * 5; 2835 *min_rate_index = j; 2836 } 2837 break; 2838 } 2839 } 2840 } 2841 } 2842 2843 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2844 struct cfg80211_bss *cbss, 2845 struct ieee80211_mgmt *mgmt, size_t len) 2846 { 2847 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2848 struct ieee80211_local *local = sdata->local; 2849 struct ieee80211_supported_band *sband; 2850 struct sta_info *sta; 2851 u8 *pos; 2852 u16 capab_info, aid; 2853 struct ieee802_11_elems elems; 2854 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2855 const struct cfg80211_bss_ies *bss_ies = NULL; 2856 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2857 u32 changed = 0; 2858 int err; 2859 bool ret; 2860 2861 /* AssocResp and ReassocResp have identical structure */ 2862 2863 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2864 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2865 2866 /* 2867 * The 5 MSB of the AID field are reserved 2868 * (802.11-2016 9.4.1.8 AID field) 2869 */ 2870 aid &= 0x7ff; 2871 2872 ifmgd->broken_ap = false; 2873 2874 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2875 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2876 aid); 2877 aid = 0; 2878 ifmgd->broken_ap = true; 2879 } 2880 2881 pos = mgmt->u.assoc_resp.variable; 2882 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2883 2884 if (!elems.supp_rates) { 2885 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2886 return false; 2887 } 2888 2889 ifmgd->aid = aid; 2890 ifmgd->tdls_chan_switch_prohibited = 2891 elems.ext_capab && elems.ext_capab_len >= 5 && 2892 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2893 2894 /* 2895 * Some APs are erroneously not including some information in their 2896 * (re)association response frames. Try to recover by using the data 2897 * from the beacon or probe response. This seems to afflict mobile 2898 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2899 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2900 */ 2901 if ((assoc_data->wmm && !elems.wmm_param) || 2902 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2903 (!elems.ht_cap_elem || !elems.ht_operation)) || 2904 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2905 (!elems.vht_cap_elem || !elems.vht_operation))) { 2906 const struct cfg80211_bss_ies *ies; 2907 struct ieee802_11_elems bss_elems; 2908 2909 rcu_read_lock(); 2910 ies = rcu_dereference(cbss->ies); 2911 if (ies) 2912 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2913 GFP_ATOMIC); 2914 rcu_read_unlock(); 2915 if (!bss_ies) 2916 return false; 2917 2918 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2919 false, &bss_elems); 2920 if (assoc_data->wmm && 2921 !elems.wmm_param && bss_elems.wmm_param) { 2922 elems.wmm_param = bss_elems.wmm_param; 2923 sdata_info(sdata, 2924 "AP bug: WMM param missing from AssocResp\n"); 2925 } 2926 2927 /* 2928 * Also check if we requested HT/VHT, otherwise the AP doesn't 2929 * have to include the IEs in the (re)association response. 2930 */ 2931 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2932 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2933 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2934 sdata_info(sdata, 2935 "AP bug: HT capability missing from AssocResp\n"); 2936 } 2937 if (!elems.ht_operation && bss_elems.ht_operation && 2938 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2939 elems.ht_operation = bss_elems.ht_operation; 2940 sdata_info(sdata, 2941 "AP bug: HT operation missing from AssocResp\n"); 2942 } 2943 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2944 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2945 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2946 sdata_info(sdata, 2947 "AP bug: VHT capa missing from AssocResp\n"); 2948 } 2949 if (!elems.vht_operation && bss_elems.vht_operation && 2950 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2951 elems.vht_operation = bss_elems.vht_operation; 2952 sdata_info(sdata, 2953 "AP bug: VHT operation missing from AssocResp\n"); 2954 } 2955 } 2956 2957 /* 2958 * We previously checked these in the beacon/probe response, so 2959 * they should be present here. This is just a safety net. 2960 */ 2961 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2962 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2963 sdata_info(sdata, 2964 "HT AP is missing WMM params or HT capability/operation\n"); 2965 ret = false; 2966 goto out; 2967 } 2968 2969 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2970 (!elems.vht_cap_elem || !elems.vht_operation)) { 2971 sdata_info(sdata, 2972 "VHT AP is missing VHT capability/operation\n"); 2973 ret = false; 2974 goto out; 2975 } 2976 2977 mutex_lock(&sdata->local->sta_mtx); 2978 /* 2979 * station info was already allocated and inserted before 2980 * the association and should be available to us 2981 */ 2982 sta = sta_info_get(sdata, cbss->bssid); 2983 if (WARN_ON(!sta)) { 2984 mutex_unlock(&sdata->local->sta_mtx); 2985 ret = false; 2986 goto out; 2987 } 2988 2989 sband = ieee80211_get_sband(sdata); 2990 if (!sband) { 2991 mutex_unlock(&sdata->local->sta_mtx); 2992 ret = false; 2993 goto out; 2994 } 2995 2996 /* Set up internal HT/VHT capabilities */ 2997 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2998 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2999 elems.ht_cap_elem, sta); 3000 3001 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 3002 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 3003 elems.vht_cap_elem, sta); 3004 3005 /* 3006 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3007 * in their association response, so ignore that data for our own 3008 * configuration. If it changed since the last beacon, we'll get the 3009 * next beacon and update then. 3010 */ 3011 3012 /* 3013 * If an operating mode notification IE is present, override the 3014 * NSS calculation (that would be done in rate_control_rate_init()) 3015 * and use the # of streams from that element. 3016 */ 3017 if (elems.opmode_notif && 3018 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3019 u8 nss; 3020 3021 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3022 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3023 nss += 1; 3024 sta->sta.rx_nss = nss; 3025 } 3026 3027 rate_control_rate_init(sta); 3028 3029 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3030 set_sta_flag(sta, WLAN_STA_MFP); 3031 sta->sta.mfp = true; 3032 } else { 3033 sta->sta.mfp = false; 3034 } 3035 3036 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3037 3038 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3039 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3040 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3041 if (err) { 3042 sdata_info(sdata, 3043 "failed to move station %pM to desired state\n", 3044 sta->sta.addr); 3045 WARN_ON(__sta_info_destroy(sta)); 3046 mutex_unlock(&sdata->local->sta_mtx); 3047 ret = false; 3048 goto out; 3049 } 3050 3051 mutex_unlock(&sdata->local->sta_mtx); 3052 3053 /* 3054 * Always handle WMM once after association regardless 3055 * of the first value the AP uses. Setting -1 here has 3056 * that effect because the AP values is an unsigned 3057 * 4-bit value. 3058 */ 3059 ifmgd->wmm_last_param_set = -1; 3060 3061 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3062 ieee80211_set_wmm_default(sdata, false, false); 3063 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3064 elems.wmm_param_len)) { 3065 /* still enable QoS since we might have HT/VHT */ 3066 ieee80211_set_wmm_default(sdata, false, true); 3067 /* set the disable-WMM flag in this case to disable 3068 * tracking WMM parameter changes in the beacon if 3069 * the parameters weren't actually valid. Doing so 3070 * avoids changing parameters very strangely when 3071 * the AP is going back and forth between valid and 3072 * invalid parameters. 3073 */ 3074 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3075 } 3076 changed |= BSS_CHANGED_QOS; 3077 3078 if (elems.max_idle_period_ie) { 3079 bss_conf->max_idle_period = 3080 le16_to_cpu(elems.max_idle_period_ie->max_idle_period); 3081 bss_conf->protected_keep_alive = 3082 !!(elems.max_idle_period_ie->idle_options & 3083 WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE); 3084 changed |= BSS_CHANGED_KEEP_ALIVE; 3085 } else { 3086 bss_conf->max_idle_period = 0; 3087 bss_conf->protected_keep_alive = false; 3088 } 3089 3090 /* set AID and assoc capability, 3091 * ieee80211_set_associated() will tell the driver */ 3092 bss_conf->aid = aid; 3093 bss_conf->assoc_capability = capab_info; 3094 ieee80211_set_associated(sdata, cbss, changed); 3095 3096 /* 3097 * If we're using 4-addr mode, let the AP know that we're 3098 * doing so, so that it can create the STA VLAN on its side 3099 */ 3100 if (ifmgd->use_4addr) 3101 ieee80211_send_4addr_nullfunc(local, sdata); 3102 3103 /* 3104 * Start timer to probe the connection to the AP now. 3105 * Also start the timer that will detect beacon loss. 3106 */ 3107 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3108 ieee80211_sta_reset_beacon_monitor(sdata); 3109 3110 ret = true; 3111 out: 3112 kfree(bss_ies); 3113 return ret; 3114 } 3115 3116 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3117 struct ieee80211_mgmt *mgmt, 3118 size_t len) 3119 { 3120 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3121 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3122 u16 capab_info, status_code, aid; 3123 struct ieee802_11_elems elems; 3124 int ac, uapsd_queues = -1; 3125 u8 *pos; 3126 bool reassoc; 3127 struct cfg80211_bss *bss; 3128 struct ieee80211_event event = { 3129 .type = MLME_EVENT, 3130 .u.mlme.data = ASSOC_EVENT, 3131 }; 3132 3133 sdata_assert_lock(sdata); 3134 3135 if (!assoc_data) 3136 return; 3137 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3138 return; 3139 3140 /* 3141 * AssocResp and ReassocResp have identical structure, so process both 3142 * of them in this function. 3143 */ 3144 3145 if (len < 24 + 6) 3146 return; 3147 3148 reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control); 3149 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3150 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3151 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3152 3153 sdata_info(sdata, 3154 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3155 reassoc ? "Rea" : "A", mgmt->sa, 3156 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3157 3158 if (assoc_data->fils_kek_len && 3159 fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0) 3160 return; 3161 3162 pos = mgmt->u.assoc_resp.variable; 3163 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3164 3165 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3166 elems.timeout_int && 3167 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3168 u32 tu, ms; 3169 tu = le32_to_cpu(elems.timeout_int->value); 3170 ms = tu * 1024 / 1000; 3171 sdata_info(sdata, 3172 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3173 mgmt->sa, tu, ms); 3174 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3175 assoc_data->timeout_started = true; 3176 if (ms > IEEE80211_ASSOC_TIMEOUT) 3177 run_again(sdata, assoc_data->timeout); 3178 return; 3179 } 3180 3181 bss = assoc_data->bss; 3182 3183 if (status_code != WLAN_STATUS_SUCCESS) { 3184 sdata_info(sdata, "%pM denied association (code=%d)\n", 3185 mgmt->sa, status_code); 3186 ieee80211_destroy_assoc_data(sdata, false, false); 3187 event.u.mlme.status = MLME_DENIED; 3188 event.u.mlme.reason = status_code; 3189 drv_event_callback(sdata->local, sdata, &event); 3190 } else { 3191 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3192 /* oops -- internal error -- send timeout for now */ 3193 ieee80211_destroy_assoc_data(sdata, false, false); 3194 cfg80211_assoc_timeout(sdata->dev, bss); 3195 return; 3196 } 3197 event.u.mlme.status = MLME_SUCCESS; 3198 drv_event_callback(sdata->local, sdata, &event); 3199 sdata_info(sdata, "associated\n"); 3200 3201 /* 3202 * destroy assoc_data afterwards, as otherwise an idle 3203 * recalc after assoc_data is NULL but before associated 3204 * is set can cause the interface to go idle 3205 */ 3206 ieee80211_destroy_assoc_data(sdata, true, false); 3207 3208 /* get uapsd queues configuration */ 3209 uapsd_queues = 0; 3210 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3211 if (sdata->tx_conf[ac].uapsd) 3212 uapsd_queues |= ieee80211_ac_to_qos_mask[ac]; 3213 } 3214 3215 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3216 } 3217 3218 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3219 struct ieee80211_mgmt *mgmt, size_t len, 3220 struct ieee80211_rx_status *rx_status, 3221 struct ieee802_11_elems *elems) 3222 { 3223 struct ieee80211_local *local = sdata->local; 3224 struct ieee80211_bss *bss; 3225 struct ieee80211_channel *channel; 3226 3227 sdata_assert_lock(sdata); 3228 3229 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3230 if (!channel) 3231 return; 3232 3233 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3234 channel); 3235 if (bss) { 3236 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3237 ieee80211_rx_bss_put(local, bss); 3238 } 3239 } 3240 3241 3242 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3243 struct sk_buff *skb) 3244 { 3245 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3246 struct ieee80211_if_managed *ifmgd; 3247 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3248 size_t baselen, len = skb->len; 3249 struct ieee802_11_elems elems; 3250 3251 ifmgd = &sdata->u.mgd; 3252 3253 sdata_assert_lock(sdata); 3254 3255 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3256 return; /* ignore ProbeResp to foreign address */ 3257 3258 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3259 if (baselen > len) 3260 return; 3261 3262 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3263 false, &elems); 3264 3265 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3266 3267 if (ifmgd->associated && 3268 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3269 ieee80211_reset_ap_probe(sdata); 3270 } 3271 3272 /* 3273 * This is the canonical list of information elements we care about, 3274 * the filter code also gives us all changes to the Microsoft OUI 3275 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3276 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3277 * changes to requested client power. 3278 * 3279 * We implement beacon filtering in software since that means we can 3280 * avoid processing the frame here and in cfg80211, and userspace 3281 * will not be able to tell whether the hardware supports it or not. 3282 * 3283 * XXX: This list needs to be dynamic -- userspace needs to be able to 3284 * add items it requires. It also needs to be able to tell us to 3285 * look out for other vendor IEs. 3286 */ 3287 static const u64 care_about_ies = 3288 (1ULL << WLAN_EID_COUNTRY) | 3289 (1ULL << WLAN_EID_ERP_INFO) | 3290 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3291 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3292 (1ULL << WLAN_EID_HT_CAPABILITY) | 3293 (1ULL << WLAN_EID_HT_OPERATION) | 3294 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3295 3296 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3297 struct ieee80211_mgmt *mgmt, size_t len, 3298 struct ieee80211_rx_status *rx_status) 3299 { 3300 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3301 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3302 size_t baselen; 3303 struct ieee802_11_elems elems; 3304 struct ieee80211_local *local = sdata->local; 3305 struct ieee80211_chanctx_conf *chanctx_conf; 3306 struct ieee80211_channel *chan; 3307 struct sta_info *sta; 3308 u32 changed = 0; 3309 bool erp_valid; 3310 u8 erp_value = 0; 3311 u32 ncrc; 3312 u8 *bssid; 3313 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3314 3315 sdata_assert_lock(sdata); 3316 3317 /* Process beacon from the current BSS */ 3318 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3319 if (baselen > len) 3320 return; 3321 3322 rcu_read_lock(); 3323 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3324 if (!chanctx_conf) { 3325 rcu_read_unlock(); 3326 return; 3327 } 3328 3329 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3330 rcu_read_unlock(); 3331 return; 3332 } 3333 chan = chanctx_conf->def.chan; 3334 rcu_read_unlock(); 3335 3336 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3337 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3338 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3339 len - baselen, false, &elems); 3340 3341 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3342 if (elems.tim && !elems.parse_error) { 3343 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3344 ifmgd->dtim_period = tim_ie->dtim_period; 3345 } 3346 ifmgd->have_beacon = true; 3347 ifmgd->assoc_data->need_beacon = false; 3348 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3349 sdata->vif.bss_conf.sync_tsf = 3350 le64_to_cpu(mgmt->u.beacon.timestamp); 3351 sdata->vif.bss_conf.sync_device_ts = 3352 rx_status->device_timestamp; 3353 if (elems.tim) 3354 sdata->vif.bss_conf.sync_dtim_count = 3355 elems.tim->dtim_count; 3356 else 3357 sdata->vif.bss_conf.sync_dtim_count = 0; 3358 } 3359 /* continue assoc process */ 3360 ifmgd->assoc_data->timeout = jiffies; 3361 ifmgd->assoc_data->timeout_started = true; 3362 run_again(sdata, ifmgd->assoc_data->timeout); 3363 return; 3364 } 3365 3366 if (!ifmgd->associated || 3367 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3368 return; 3369 bssid = ifmgd->associated->bssid; 3370 3371 /* Track average RSSI from the Beacon frames of the current AP */ 3372 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3373 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3374 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3375 ifmgd->last_cqm_event_signal = 0; 3376 ifmgd->count_beacon_signal = 1; 3377 ifmgd->last_ave_beacon_signal = 0; 3378 } else { 3379 ifmgd->count_beacon_signal++; 3380 } 3381 3382 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3383 3384 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3385 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3386 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3387 int last_sig = ifmgd->last_ave_beacon_signal; 3388 struct ieee80211_event event = { 3389 .type = RSSI_EVENT, 3390 }; 3391 3392 /* 3393 * if signal crosses either of the boundaries, invoke callback 3394 * with appropriate parameters 3395 */ 3396 if (sig > ifmgd->rssi_max_thold && 3397 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3398 ifmgd->last_ave_beacon_signal = sig; 3399 event.u.rssi.data = RSSI_EVENT_HIGH; 3400 drv_event_callback(local, sdata, &event); 3401 } else if (sig < ifmgd->rssi_min_thold && 3402 (last_sig >= ifmgd->rssi_max_thold || 3403 last_sig == 0)) { 3404 ifmgd->last_ave_beacon_signal = sig; 3405 event.u.rssi.data = RSSI_EVENT_LOW; 3406 drv_event_callback(local, sdata, &event); 3407 } 3408 } 3409 3410 if (bss_conf->cqm_rssi_thold && 3411 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3412 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3413 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3414 int last_event = ifmgd->last_cqm_event_signal; 3415 int thold = bss_conf->cqm_rssi_thold; 3416 int hyst = bss_conf->cqm_rssi_hyst; 3417 3418 if (sig < thold && 3419 (last_event == 0 || sig < last_event - hyst)) { 3420 ifmgd->last_cqm_event_signal = sig; 3421 ieee80211_cqm_rssi_notify( 3422 &sdata->vif, 3423 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3424 sig, GFP_KERNEL); 3425 } else if (sig > thold && 3426 (last_event == 0 || sig > last_event + hyst)) { 3427 ifmgd->last_cqm_event_signal = sig; 3428 ieee80211_cqm_rssi_notify( 3429 &sdata->vif, 3430 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3431 sig, GFP_KERNEL); 3432 } 3433 } 3434 3435 if (bss_conf->cqm_rssi_low && 3436 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3437 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3438 int last_event = ifmgd->last_cqm_event_signal; 3439 int low = bss_conf->cqm_rssi_low; 3440 int high = bss_conf->cqm_rssi_high; 3441 3442 if (sig < low && 3443 (last_event == 0 || last_event >= low)) { 3444 ifmgd->last_cqm_event_signal = sig; 3445 ieee80211_cqm_rssi_notify( 3446 &sdata->vif, 3447 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3448 sig, GFP_KERNEL); 3449 } else if (sig > high && 3450 (last_event == 0 || last_event <= high)) { 3451 ifmgd->last_cqm_event_signal = sig; 3452 ieee80211_cqm_rssi_notify( 3453 &sdata->vif, 3454 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3455 sig, GFP_KERNEL); 3456 } 3457 } 3458 3459 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3460 mlme_dbg_ratelimited(sdata, 3461 "cancelling AP probe due to a received beacon\n"); 3462 ieee80211_reset_ap_probe(sdata); 3463 } 3464 3465 /* 3466 * Push the beacon loss detection into the future since 3467 * we are processing a beacon from the AP just now. 3468 */ 3469 ieee80211_sta_reset_beacon_monitor(sdata); 3470 3471 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3472 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3473 len - baselen, false, &elems, 3474 care_about_ies, ncrc); 3475 3476 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3477 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3478 if (local->hw.conf.dynamic_ps_timeout > 0) { 3479 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3480 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3481 ieee80211_hw_config(local, 3482 IEEE80211_CONF_CHANGE_PS); 3483 } 3484 ieee80211_send_nullfunc(local, sdata, false); 3485 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3486 local->pspolling = true; 3487 3488 /* 3489 * Here is assumed that the driver will be 3490 * able to send ps-poll frame and receive a 3491 * response even though power save mode is 3492 * enabled, but some drivers might require 3493 * to disable power save here. This needs 3494 * to be investigated. 3495 */ 3496 ieee80211_send_pspoll(local, sdata); 3497 } 3498 } 3499 3500 if (sdata->vif.p2p || 3501 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3502 struct ieee80211_p2p_noa_attr noa = {}; 3503 int ret; 3504 3505 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3506 len - baselen, 3507 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3508 (u8 *) &noa, sizeof(noa)); 3509 if (ret >= 2) { 3510 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3511 /* valid noa_attr and index changed */ 3512 sdata->u.mgd.p2p_noa_index = noa.index; 3513 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3514 changed |= BSS_CHANGED_P2P_PS; 3515 /* 3516 * make sure we update all information, the CRC 3517 * mechanism doesn't look at P2P attributes. 3518 */ 3519 ifmgd->beacon_crc_valid = false; 3520 } 3521 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3522 /* noa_attr not found and we had valid noa_attr before */ 3523 sdata->u.mgd.p2p_noa_index = -1; 3524 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3525 changed |= BSS_CHANGED_P2P_PS; 3526 ifmgd->beacon_crc_valid = false; 3527 } 3528 } 3529 3530 if (ifmgd->csa_waiting_bcn) 3531 ieee80211_chswitch_post_beacon(sdata); 3532 3533 /* 3534 * Update beacon timing and dtim count on every beacon appearance. This 3535 * will allow the driver to use the most updated values. Do it before 3536 * comparing this one with last received beacon. 3537 * IMPORTANT: These parameters would possibly be out of sync by the time 3538 * the driver will use them. The synchronized view is currently 3539 * guaranteed only in certain callbacks. 3540 */ 3541 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3542 sdata->vif.bss_conf.sync_tsf = 3543 le64_to_cpu(mgmt->u.beacon.timestamp); 3544 sdata->vif.bss_conf.sync_device_ts = 3545 rx_status->device_timestamp; 3546 if (elems.tim) 3547 sdata->vif.bss_conf.sync_dtim_count = 3548 elems.tim->dtim_count; 3549 else 3550 sdata->vif.bss_conf.sync_dtim_count = 0; 3551 } 3552 3553 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3554 return; 3555 ifmgd->beacon_crc = ncrc; 3556 ifmgd->beacon_crc_valid = true; 3557 3558 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3559 3560 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3561 rx_status->device_timestamp, 3562 &elems, true); 3563 3564 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3565 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3566 elems.wmm_param_len)) 3567 changed |= BSS_CHANGED_QOS; 3568 3569 /* 3570 * If we haven't had a beacon before, tell the driver about the 3571 * DTIM period (and beacon timing if desired) now. 3572 */ 3573 if (!ifmgd->have_beacon) { 3574 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3575 if (elems.tim) 3576 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3577 else 3578 bss_conf->dtim_period = 1; 3579 3580 changed |= BSS_CHANGED_BEACON_INFO; 3581 ifmgd->have_beacon = true; 3582 3583 mutex_lock(&local->iflist_mtx); 3584 ieee80211_recalc_ps(local); 3585 mutex_unlock(&local->iflist_mtx); 3586 3587 ieee80211_recalc_ps_vif(sdata); 3588 } 3589 3590 if (elems.erp_info) { 3591 erp_valid = true; 3592 erp_value = elems.erp_info[0]; 3593 } else { 3594 erp_valid = false; 3595 } 3596 changed |= ieee80211_handle_bss_capability(sdata, 3597 le16_to_cpu(mgmt->u.beacon.capab_info), 3598 erp_valid, erp_value); 3599 3600 mutex_lock(&local->sta_mtx); 3601 sta = sta_info_get(sdata, bssid); 3602 3603 if (ieee80211_config_bw(sdata, sta, 3604 elems.ht_cap_elem, elems.ht_operation, 3605 elems.vht_operation, bssid, &changed)) { 3606 mutex_unlock(&local->sta_mtx); 3607 sdata_info(sdata, 3608 "failed to follow AP %pM bandwidth change, disconnect\n", 3609 bssid); 3610 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3611 WLAN_REASON_DEAUTH_LEAVING, 3612 true, deauth_buf); 3613 ieee80211_report_disconnect(sdata, deauth_buf, 3614 sizeof(deauth_buf), true, 3615 WLAN_REASON_DEAUTH_LEAVING); 3616 return; 3617 } 3618 3619 if (sta && elems.opmode_notif) 3620 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3621 rx_status->band); 3622 mutex_unlock(&local->sta_mtx); 3623 3624 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3625 elems.country_elem, 3626 elems.country_elem_len, 3627 elems.pwr_constr_elem, 3628 elems.cisco_dtpc_elem); 3629 3630 ieee80211_bss_info_change_notify(sdata, changed); 3631 } 3632 3633 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3634 struct sk_buff *skb) 3635 { 3636 struct ieee80211_rx_status *rx_status; 3637 struct ieee80211_mgmt *mgmt; 3638 u16 fc; 3639 struct ieee802_11_elems elems; 3640 int ies_len; 3641 3642 rx_status = (struct ieee80211_rx_status *) skb->cb; 3643 mgmt = (struct ieee80211_mgmt *) skb->data; 3644 fc = le16_to_cpu(mgmt->frame_control); 3645 3646 sdata_lock(sdata); 3647 3648 switch (fc & IEEE80211_FCTL_STYPE) { 3649 case IEEE80211_STYPE_BEACON: 3650 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3651 break; 3652 case IEEE80211_STYPE_PROBE_RESP: 3653 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3654 break; 3655 case IEEE80211_STYPE_AUTH: 3656 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3657 break; 3658 case IEEE80211_STYPE_DEAUTH: 3659 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3660 break; 3661 case IEEE80211_STYPE_DISASSOC: 3662 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3663 break; 3664 case IEEE80211_STYPE_ASSOC_RESP: 3665 case IEEE80211_STYPE_REASSOC_RESP: 3666 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3667 break; 3668 case IEEE80211_STYPE_ACTION: 3669 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3670 ies_len = skb->len - 3671 offsetof(struct ieee80211_mgmt, 3672 u.action.u.chan_switch.variable); 3673 3674 if (ies_len < 0) 3675 break; 3676 3677 ieee802_11_parse_elems( 3678 mgmt->u.action.u.chan_switch.variable, 3679 ies_len, true, &elems); 3680 3681 if (elems.parse_error) 3682 break; 3683 3684 ieee80211_sta_process_chanswitch(sdata, 3685 rx_status->mactime, 3686 rx_status->device_timestamp, 3687 &elems, false); 3688 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3689 ies_len = skb->len - 3690 offsetof(struct ieee80211_mgmt, 3691 u.action.u.ext_chan_switch.variable); 3692 3693 if (ies_len < 0) 3694 break; 3695 3696 ieee802_11_parse_elems( 3697 mgmt->u.action.u.ext_chan_switch.variable, 3698 ies_len, true, &elems); 3699 3700 if (elems.parse_error) 3701 break; 3702 3703 /* for the handling code pretend this was also an IE */ 3704 elems.ext_chansw_ie = 3705 &mgmt->u.action.u.ext_chan_switch.data; 3706 3707 ieee80211_sta_process_chanswitch(sdata, 3708 rx_status->mactime, 3709 rx_status->device_timestamp, 3710 &elems, false); 3711 } 3712 break; 3713 } 3714 sdata_unlock(sdata); 3715 } 3716 3717 static void ieee80211_sta_timer(struct timer_list *t) 3718 { 3719 struct ieee80211_sub_if_data *sdata = 3720 from_timer(sdata, t, u.mgd.timer); 3721 3722 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3723 } 3724 3725 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3726 u8 *bssid, u8 reason, bool tx) 3727 { 3728 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3729 3730 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3731 tx, frame_buf); 3732 3733 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3734 reason); 3735 } 3736 3737 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3738 { 3739 struct ieee80211_local *local = sdata->local; 3740 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3741 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3742 u32 tx_flags = 0; 3743 u16 trans = 1; 3744 u16 status = 0; 3745 3746 sdata_assert_lock(sdata); 3747 3748 if (WARN_ON_ONCE(!auth_data)) 3749 return -EINVAL; 3750 3751 auth_data->tries++; 3752 3753 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3754 sdata_info(sdata, "authentication with %pM timed out\n", 3755 auth_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, auth_data->bss); 3762 3763 return -ETIMEDOUT; 3764 } 3765 3766 drv_mgd_prepare_tx(local, sdata); 3767 3768 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3769 auth_data->bss->bssid, auth_data->tries, 3770 IEEE80211_AUTH_MAX_TRIES); 3771 3772 auth_data->expected_transaction = 2; 3773 3774 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3775 trans = auth_data->sae_trans; 3776 status = auth_data->sae_status; 3777 auth_data->expected_transaction = trans; 3778 } 3779 3780 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3781 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3782 IEEE80211_TX_INTFL_MLME_CONN_TX; 3783 3784 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3785 auth_data->data, auth_data->data_len, 3786 auth_data->bss->bssid, 3787 auth_data->bss->bssid, NULL, 0, 0, 3788 tx_flags); 3789 3790 if (tx_flags == 0) { 3791 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3792 auth_data->timeout_started = true; 3793 run_again(sdata, auth_data->timeout); 3794 } else { 3795 auth_data->timeout = 3796 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3797 auth_data->timeout_started = true; 3798 run_again(sdata, auth_data->timeout); 3799 } 3800 3801 return 0; 3802 } 3803 3804 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3805 { 3806 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3807 struct ieee80211_local *local = sdata->local; 3808 3809 sdata_assert_lock(sdata); 3810 3811 assoc_data->tries++; 3812 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3813 sdata_info(sdata, "association with %pM timed out\n", 3814 assoc_data->bss->bssid); 3815 3816 /* 3817 * Most likely AP is not in the range so remove the 3818 * bss struct for that AP. 3819 */ 3820 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3821 3822 return -ETIMEDOUT; 3823 } 3824 3825 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3826 assoc_data->bss->bssid, assoc_data->tries, 3827 IEEE80211_ASSOC_MAX_TRIES); 3828 ieee80211_send_assoc(sdata); 3829 3830 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3831 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3832 assoc_data->timeout_started = true; 3833 run_again(sdata, assoc_data->timeout); 3834 } else { 3835 assoc_data->timeout = 3836 round_jiffies_up(jiffies + 3837 IEEE80211_ASSOC_TIMEOUT_LONG); 3838 assoc_data->timeout_started = true; 3839 run_again(sdata, assoc_data->timeout); 3840 } 3841 3842 return 0; 3843 } 3844 3845 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3846 __le16 fc, bool acked) 3847 { 3848 struct ieee80211_local *local = sdata->local; 3849 3850 sdata->u.mgd.status_fc = fc; 3851 sdata->u.mgd.status_acked = acked; 3852 sdata->u.mgd.status_received = true; 3853 3854 ieee80211_queue_work(&local->hw, &sdata->work); 3855 } 3856 3857 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3858 { 3859 struct ieee80211_local *local = sdata->local; 3860 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3861 3862 sdata_lock(sdata); 3863 3864 if (ifmgd->status_received) { 3865 __le16 fc = ifmgd->status_fc; 3866 bool status_acked = ifmgd->status_acked; 3867 3868 ifmgd->status_received = false; 3869 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3870 if (status_acked) { 3871 ifmgd->auth_data->timeout = 3872 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3873 run_again(sdata, ifmgd->auth_data->timeout); 3874 } else { 3875 ifmgd->auth_data->timeout = jiffies - 1; 3876 } 3877 ifmgd->auth_data->timeout_started = true; 3878 } else if (ifmgd->assoc_data && 3879 (ieee80211_is_assoc_req(fc) || 3880 ieee80211_is_reassoc_req(fc))) { 3881 if (status_acked) { 3882 ifmgd->assoc_data->timeout = 3883 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3884 run_again(sdata, ifmgd->assoc_data->timeout); 3885 } else { 3886 ifmgd->assoc_data->timeout = jiffies - 1; 3887 } 3888 ifmgd->assoc_data->timeout_started = true; 3889 } 3890 } 3891 3892 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3893 time_after(jiffies, ifmgd->auth_data->timeout)) { 3894 if (ifmgd->auth_data->done) { 3895 /* 3896 * ok ... we waited for assoc but userspace didn't, 3897 * so let's just kill the auth data 3898 */ 3899 ieee80211_destroy_auth_data(sdata, false); 3900 } else if (ieee80211_auth(sdata)) { 3901 u8 bssid[ETH_ALEN]; 3902 struct ieee80211_event event = { 3903 .type = MLME_EVENT, 3904 .u.mlme.data = AUTH_EVENT, 3905 .u.mlme.status = MLME_TIMEOUT, 3906 }; 3907 3908 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3909 3910 ieee80211_destroy_auth_data(sdata, false); 3911 3912 cfg80211_auth_timeout(sdata->dev, bssid); 3913 drv_event_callback(sdata->local, sdata, &event); 3914 } 3915 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3916 run_again(sdata, ifmgd->auth_data->timeout); 3917 3918 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3919 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3920 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3921 ieee80211_do_assoc(sdata)) { 3922 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3923 struct ieee80211_event event = { 3924 .type = MLME_EVENT, 3925 .u.mlme.data = ASSOC_EVENT, 3926 .u.mlme.status = MLME_TIMEOUT, 3927 }; 3928 3929 ieee80211_destroy_assoc_data(sdata, false, false); 3930 cfg80211_assoc_timeout(sdata->dev, bss); 3931 drv_event_callback(sdata->local, sdata, &event); 3932 } 3933 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3934 run_again(sdata, ifmgd->assoc_data->timeout); 3935 3936 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3937 ifmgd->associated) { 3938 u8 bssid[ETH_ALEN]; 3939 int max_tries; 3940 3941 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3942 3943 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3944 max_tries = max_nullfunc_tries; 3945 else 3946 max_tries = max_probe_tries; 3947 3948 /* ACK received for nullfunc probing frame */ 3949 if (!ifmgd->probe_send_count) 3950 ieee80211_reset_ap_probe(sdata); 3951 else if (ifmgd->nullfunc_failed) { 3952 if (ifmgd->probe_send_count < max_tries) { 3953 mlme_dbg(sdata, 3954 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3955 bssid, ifmgd->probe_send_count, 3956 max_tries); 3957 ieee80211_mgd_probe_ap_send(sdata); 3958 } else { 3959 mlme_dbg(sdata, 3960 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3961 bssid); 3962 ieee80211_sta_connection_lost(sdata, bssid, 3963 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3964 false); 3965 } 3966 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3967 run_again(sdata, ifmgd->probe_timeout); 3968 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3969 mlme_dbg(sdata, 3970 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3971 bssid, probe_wait_ms); 3972 ieee80211_sta_connection_lost(sdata, bssid, 3973 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3974 } else if (ifmgd->probe_send_count < max_tries) { 3975 mlme_dbg(sdata, 3976 "No probe response from AP %pM after %dms, try %d/%i\n", 3977 bssid, probe_wait_ms, 3978 ifmgd->probe_send_count, max_tries); 3979 ieee80211_mgd_probe_ap_send(sdata); 3980 } else { 3981 /* 3982 * We actually lost the connection ... or did we? 3983 * Let's make sure! 3984 */ 3985 mlme_dbg(sdata, 3986 "No probe response from AP %pM after %dms, disconnecting.\n", 3987 bssid, probe_wait_ms); 3988 3989 ieee80211_sta_connection_lost(sdata, bssid, 3990 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3991 } 3992 } 3993 3994 sdata_unlock(sdata); 3995 } 3996 3997 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t) 3998 { 3999 struct ieee80211_sub_if_data *sdata = 4000 from_timer(sdata, t, u.mgd.bcn_mon_timer); 4001 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4002 4003 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 4004 return; 4005 4006 sdata->u.mgd.connection_loss = false; 4007 ieee80211_queue_work(&sdata->local->hw, 4008 &sdata->u.mgd.beacon_connection_loss_work); 4009 } 4010 4011 static void ieee80211_sta_conn_mon_timer(struct timer_list *t) 4012 { 4013 struct ieee80211_sub_if_data *sdata = 4014 from_timer(sdata, t, u.mgd.conn_mon_timer); 4015 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4016 struct ieee80211_local *local = sdata->local; 4017 4018 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 4019 return; 4020 4021 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 4022 } 4023 4024 static void ieee80211_sta_monitor_work(struct work_struct *work) 4025 { 4026 struct ieee80211_sub_if_data *sdata = 4027 container_of(work, struct ieee80211_sub_if_data, 4028 u.mgd.monitor_work); 4029 4030 ieee80211_mgd_probe_ap(sdata, false); 4031 } 4032 4033 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 4034 { 4035 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 4036 __ieee80211_stop_poll(sdata); 4037 4038 /* let's probe the connection once */ 4039 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 4040 ieee80211_queue_work(&sdata->local->hw, 4041 &sdata->u.mgd.monitor_work); 4042 } 4043 } 4044 4045 #ifdef CONFIG_PM 4046 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4047 { 4048 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4049 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4050 4051 sdata_lock(sdata); 4052 4053 if (ifmgd->auth_data || ifmgd->assoc_data) { 4054 const u8 *bssid = ifmgd->auth_data ? 4055 ifmgd->auth_data->bss->bssid : 4056 ifmgd->assoc_data->bss->bssid; 4057 4058 /* 4059 * If we are trying to authenticate / associate while suspending, 4060 * cfg80211 won't know and won't actually abort those attempts, 4061 * thus we need to do that ourselves. 4062 */ 4063 ieee80211_send_deauth_disassoc(sdata, bssid, 4064 IEEE80211_STYPE_DEAUTH, 4065 WLAN_REASON_DEAUTH_LEAVING, 4066 false, frame_buf); 4067 if (ifmgd->assoc_data) 4068 ieee80211_destroy_assoc_data(sdata, false, true); 4069 if (ifmgd->auth_data) 4070 ieee80211_destroy_auth_data(sdata, false); 4071 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4072 IEEE80211_DEAUTH_FRAME_LEN); 4073 } 4074 4075 /* This is a bit of a hack - we should find a better and more generic 4076 * solution to this. Normally when suspending, cfg80211 will in fact 4077 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4078 * auth (not so important) or assoc (this is the problem) process. 4079 * 4080 * As a consequence, it can happen that we are in the process of both 4081 * associating and suspending, and receive an association response 4082 * after cfg80211 has checked if it needs to disconnect, but before 4083 * we actually set the flag to drop incoming frames. This will then 4084 * cause the workqueue flush to process the association response in 4085 * the suspend, resulting in a successful association just before it 4086 * tries to remove the interface from the driver, which now though 4087 * has a channel context assigned ... this results in issues. 4088 * 4089 * To work around this (for now) simply deauth here again if we're 4090 * now connected. 4091 */ 4092 if (ifmgd->associated && !sdata->local->wowlan) { 4093 u8 bssid[ETH_ALEN]; 4094 struct cfg80211_deauth_request req = { 4095 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4096 .bssid = bssid, 4097 }; 4098 4099 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4100 ieee80211_mgd_deauth(sdata, &req); 4101 } 4102 4103 sdata_unlock(sdata); 4104 } 4105 4106 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4107 { 4108 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4109 4110 sdata_lock(sdata); 4111 if (!ifmgd->associated) { 4112 sdata_unlock(sdata); 4113 return; 4114 } 4115 4116 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4117 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4118 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4119 ieee80211_sta_connection_lost(sdata, 4120 ifmgd->associated->bssid, 4121 WLAN_REASON_UNSPECIFIED, 4122 true); 4123 sdata_unlock(sdata); 4124 return; 4125 } 4126 sdata_unlock(sdata); 4127 } 4128 #endif 4129 4130 /* interface setup */ 4131 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4132 { 4133 struct ieee80211_if_managed *ifmgd; 4134 4135 ifmgd = &sdata->u.mgd; 4136 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4137 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4138 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4139 ieee80211_beacon_connection_loss_work); 4140 INIT_WORK(&ifmgd->csa_connection_drop_work, 4141 ieee80211_csa_connection_drop_work); 4142 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4143 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4144 ieee80211_tdls_peer_del_work); 4145 timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0); 4146 timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0); 4147 timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0); 4148 timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0); 4149 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4150 ieee80211_sta_handle_tspec_ac_params_wk); 4151 4152 ifmgd->flags = 0; 4153 ifmgd->powersave = sdata->wdev.ps; 4154 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4155 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4156 ifmgd->p2p_noa_index = -1; 4157 4158 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4159 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4160 else 4161 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4162 4163 /* Setup TDLS data */ 4164 spin_lock_init(&ifmgd->teardown_lock); 4165 ifmgd->teardown_skb = NULL; 4166 ifmgd->orig_teardown_skb = NULL; 4167 } 4168 4169 /* scan finished notification */ 4170 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4171 { 4172 struct ieee80211_sub_if_data *sdata; 4173 4174 /* Restart STA timers */ 4175 rcu_read_lock(); 4176 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4177 if (ieee80211_sdata_running(sdata)) 4178 ieee80211_restart_sta_timer(sdata); 4179 } 4180 rcu_read_unlock(); 4181 } 4182 4183 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4184 struct cfg80211_bss *cbss) 4185 { 4186 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4187 const u8 *ht_cap_ie, *vht_cap_ie; 4188 const struct ieee80211_ht_cap *ht_cap; 4189 const struct ieee80211_vht_cap *vht_cap; 4190 u8 chains = 1; 4191 4192 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4193 return chains; 4194 4195 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4196 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4197 ht_cap = (void *)(ht_cap_ie + 2); 4198 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4199 /* 4200 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4201 * "Tx Unequal Modulation Supported" fields. 4202 */ 4203 } 4204 4205 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4206 return chains; 4207 4208 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4209 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4210 u8 nss; 4211 u16 tx_mcs_map; 4212 4213 vht_cap = (void *)(vht_cap_ie + 2); 4214 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4215 for (nss = 8; nss > 0; nss--) { 4216 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4217 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4218 break; 4219 } 4220 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4221 chains = max(chains, nss); 4222 } 4223 4224 return chains; 4225 } 4226 4227 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4228 struct cfg80211_bss *cbss) 4229 { 4230 struct ieee80211_local *local = sdata->local; 4231 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4232 const struct ieee80211_ht_cap *ht_cap = NULL; 4233 const struct ieee80211_ht_operation *ht_oper = NULL; 4234 const struct ieee80211_vht_operation *vht_oper = NULL; 4235 struct ieee80211_supported_band *sband; 4236 struct cfg80211_chan_def chandef; 4237 int ret; 4238 u32 i; 4239 bool have_80mhz; 4240 4241 sband = local->hw.wiphy->bands[cbss->channel->band]; 4242 4243 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4244 IEEE80211_STA_DISABLE_80P80MHZ | 4245 IEEE80211_STA_DISABLE_160MHZ); 4246 4247 rcu_read_lock(); 4248 4249 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4250 sband->ht_cap.ht_supported) { 4251 const u8 *ht_oper_ie, *ht_cap_ie; 4252 4253 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4254 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4255 ht_oper = (void *)(ht_oper_ie + 2); 4256 4257 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4258 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4259 ht_cap = (void *)(ht_cap_ie + 2); 4260 4261 if (!ht_cap) { 4262 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4263 ht_oper = NULL; 4264 } 4265 } 4266 4267 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4268 sband->vht_cap.vht_supported) { 4269 const u8 *vht_oper_ie, *vht_cap; 4270 4271 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4272 WLAN_EID_VHT_OPERATION); 4273 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4274 vht_oper = (void *)(vht_oper_ie + 2); 4275 if (vht_oper && !ht_oper) { 4276 vht_oper = NULL; 4277 sdata_info(sdata, 4278 "AP advertised VHT without HT, disabling both\n"); 4279 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4280 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4281 } 4282 4283 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4284 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4285 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4286 vht_oper = NULL; 4287 } 4288 } 4289 4290 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4291 have_80mhz = false; 4292 for (i = 0; i < sband->n_channels; i++) { 4293 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4294 IEEE80211_CHAN_NO_80MHZ)) 4295 continue; 4296 4297 have_80mhz = true; 4298 break; 4299 } 4300 4301 if (!have_80mhz) 4302 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4303 4304 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4305 cbss->channel, 4306 ht_oper, vht_oper, 4307 &chandef, false); 4308 4309 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4310 local->rx_chains); 4311 4312 rcu_read_unlock(); 4313 4314 /* will change later if needed */ 4315 sdata->smps_mode = IEEE80211_SMPS_OFF; 4316 4317 mutex_lock(&local->mtx); 4318 /* 4319 * If this fails (possibly due to channel context sharing 4320 * on incompatible channels, e.g. 80+80 and 160 sharing the 4321 * same control channel) try to use a smaller bandwidth. 4322 */ 4323 ret = ieee80211_vif_use_channel(sdata, &chandef, 4324 IEEE80211_CHANCTX_SHARED); 4325 4326 /* don't downgrade for 5 and 10 MHz channels, though. */ 4327 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4328 chandef.width == NL80211_CHAN_WIDTH_10) 4329 goto out; 4330 4331 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4332 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4333 ret = ieee80211_vif_use_channel(sdata, &chandef, 4334 IEEE80211_CHANCTX_SHARED); 4335 } 4336 out: 4337 mutex_unlock(&local->mtx); 4338 return ret; 4339 } 4340 4341 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4342 struct cfg80211_bss *cbss, bool assoc, 4343 bool override) 4344 { 4345 struct ieee80211_local *local = sdata->local; 4346 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4347 struct ieee80211_bss *bss = (void *)cbss->priv; 4348 struct sta_info *new_sta = NULL; 4349 struct ieee80211_supported_band *sband; 4350 bool have_sta = false; 4351 int err; 4352 4353 sband = local->hw.wiphy->bands[cbss->channel->band]; 4354 4355 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4356 return -EINVAL; 4357 4358 /* If a reconfig is happening, bail out */ 4359 if (local->in_reconfig) 4360 return -EBUSY; 4361 4362 if (assoc) { 4363 rcu_read_lock(); 4364 have_sta = sta_info_get(sdata, cbss->bssid); 4365 rcu_read_unlock(); 4366 } 4367 4368 if (!have_sta) { 4369 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4370 if (!new_sta) 4371 return -ENOMEM; 4372 } 4373 4374 /* 4375 * Set up the information for the new channel before setting the 4376 * new channel. We can't - completely race-free - change the basic 4377 * rates bitmap and the channel (sband) that it refers to, but if 4378 * we set it up before we at least avoid calling into the driver's 4379 * bss_info_changed() method with invalid information (since we do 4380 * call that from changing the channel - only for IDLE and perhaps 4381 * some others, but ...). 4382 * 4383 * So to avoid that, just set up all the new information before the 4384 * channel, but tell the driver to apply it only afterwards, since 4385 * it might need the new channel for that. 4386 */ 4387 if (new_sta) { 4388 u32 rates = 0, basic_rates = 0; 4389 bool have_higher_than_11mbit; 4390 int min_rate = INT_MAX, min_rate_index = -1; 4391 const struct cfg80211_bss_ies *ies; 4392 int shift = ieee80211_vif_get_shift(&sdata->vif); 4393 4394 ieee80211_get_rates(sband, bss->supp_rates, 4395 bss->supp_rates_len, 4396 &rates, &basic_rates, 4397 &have_higher_than_11mbit, 4398 &min_rate, &min_rate_index, 4399 shift); 4400 4401 /* 4402 * This used to be a workaround for basic rates missing 4403 * in the association response frame. Now that we no 4404 * longer use the basic rates from there, it probably 4405 * doesn't happen any more, but keep the workaround so 4406 * in case some *other* APs are buggy in different ways 4407 * we can connect -- with a warning. 4408 */ 4409 if (!basic_rates && min_rate_index >= 0) { 4410 sdata_info(sdata, 4411 "No basic rates, using min rate instead\n"); 4412 basic_rates = BIT(min_rate_index); 4413 } 4414 4415 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4416 sdata->vif.bss_conf.basic_rates = basic_rates; 4417 4418 /* cf. IEEE 802.11 9.2.12 */ 4419 if (cbss->channel->band == NL80211_BAND_2GHZ && 4420 have_higher_than_11mbit) 4421 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4422 else 4423 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4424 4425 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4426 4427 /* set timing information */ 4428 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4429 rcu_read_lock(); 4430 ies = rcu_dereference(cbss->beacon_ies); 4431 if (ies) { 4432 const u8 *tim_ie; 4433 4434 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4435 sdata->vif.bss_conf.sync_device_ts = 4436 bss->device_ts_beacon; 4437 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4438 ies->data, ies->len); 4439 if (tim_ie && tim_ie[1] >= 2) 4440 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4441 else 4442 sdata->vif.bss_conf.sync_dtim_count = 0; 4443 } else if (!ieee80211_hw_check(&sdata->local->hw, 4444 TIMING_BEACON_ONLY)) { 4445 ies = rcu_dereference(cbss->proberesp_ies); 4446 /* must be non-NULL since beacon IEs were NULL */ 4447 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4448 sdata->vif.bss_conf.sync_device_ts = 4449 bss->device_ts_presp; 4450 sdata->vif.bss_conf.sync_dtim_count = 0; 4451 } else { 4452 sdata->vif.bss_conf.sync_tsf = 0; 4453 sdata->vif.bss_conf.sync_device_ts = 0; 4454 sdata->vif.bss_conf.sync_dtim_count = 0; 4455 } 4456 rcu_read_unlock(); 4457 } 4458 4459 if (new_sta || override) { 4460 err = ieee80211_prep_channel(sdata, cbss); 4461 if (err) { 4462 if (new_sta) 4463 sta_info_free(local, new_sta); 4464 return -EINVAL; 4465 } 4466 } 4467 4468 if (new_sta) { 4469 /* 4470 * tell driver about BSSID, basic rates and timing 4471 * this was set up above, before setting the channel 4472 */ 4473 ieee80211_bss_info_change_notify(sdata, 4474 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4475 BSS_CHANGED_BEACON_INT); 4476 4477 if (assoc) 4478 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4479 4480 err = sta_info_insert(new_sta); 4481 new_sta = NULL; 4482 if (err) { 4483 sdata_info(sdata, 4484 "failed to insert STA entry for the AP (error %d)\n", 4485 err); 4486 return err; 4487 } 4488 } else 4489 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4490 4491 /* Cancel scan to ensure that nothing interferes with connection */ 4492 if (local->scanning) 4493 ieee80211_scan_cancel(local); 4494 4495 return 0; 4496 } 4497 4498 /* config hooks */ 4499 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4500 struct cfg80211_auth_request *req) 4501 { 4502 struct ieee80211_local *local = sdata->local; 4503 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4504 struct ieee80211_mgd_auth_data *auth_data; 4505 u16 auth_alg; 4506 int err; 4507 4508 /* prepare auth data structure */ 4509 4510 switch (req->auth_type) { 4511 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4512 auth_alg = WLAN_AUTH_OPEN; 4513 break; 4514 case NL80211_AUTHTYPE_SHARED_KEY: 4515 if (IS_ERR(local->wep_tx_tfm)) 4516 return -EOPNOTSUPP; 4517 auth_alg = WLAN_AUTH_SHARED_KEY; 4518 break; 4519 case NL80211_AUTHTYPE_FT: 4520 auth_alg = WLAN_AUTH_FT; 4521 break; 4522 case NL80211_AUTHTYPE_NETWORK_EAP: 4523 auth_alg = WLAN_AUTH_LEAP; 4524 break; 4525 case NL80211_AUTHTYPE_SAE: 4526 auth_alg = WLAN_AUTH_SAE; 4527 break; 4528 case NL80211_AUTHTYPE_FILS_SK: 4529 auth_alg = WLAN_AUTH_FILS_SK; 4530 break; 4531 case NL80211_AUTHTYPE_FILS_SK_PFS: 4532 auth_alg = WLAN_AUTH_FILS_SK_PFS; 4533 break; 4534 case NL80211_AUTHTYPE_FILS_PK: 4535 auth_alg = WLAN_AUTH_FILS_PK; 4536 break; 4537 default: 4538 return -EOPNOTSUPP; 4539 } 4540 4541 auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len + 4542 req->ie_len, GFP_KERNEL); 4543 if (!auth_data) 4544 return -ENOMEM; 4545 4546 auth_data->bss = req->bss; 4547 4548 if (req->auth_data_len >= 4) { 4549 if (req->auth_type == NL80211_AUTHTYPE_SAE) { 4550 __le16 *pos = (__le16 *) req->auth_data; 4551 4552 auth_data->sae_trans = le16_to_cpu(pos[0]); 4553 auth_data->sae_status = le16_to_cpu(pos[1]); 4554 } 4555 memcpy(auth_data->data, req->auth_data + 4, 4556 req->auth_data_len - 4); 4557 auth_data->data_len += req->auth_data_len - 4; 4558 } 4559 4560 if (req->ie && req->ie_len) { 4561 memcpy(&auth_data->data[auth_data->data_len], 4562 req->ie, req->ie_len); 4563 auth_data->data_len += req->ie_len; 4564 } 4565 4566 if (req->key && req->key_len) { 4567 auth_data->key_len = req->key_len; 4568 auth_data->key_idx = req->key_idx; 4569 memcpy(auth_data->key, req->key, req->key_len); 4570 } 4571 4572 auth_data->algorithm = auth_alg; 4573 4574 /* try to authenticate/probe */ 4575 4576 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4577 ifmgd->assoc_data) { 4578 err = -EBUSY; 4579 goto err_free; 4580 } 4581 4582 if (ifmgd->auth_data) 4583 ieee80211_destroy_auth_data(sdata, false); 4584 4585 /* prep auth_data so we don't go into idle on disassoc */ 4586 ifmgd->auth_data = auth_data; 4587 4588 if (ifmgd->associated) { 4589 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4590 4591 sdata_info(sdata, 4592 "disconnect from AP %pM for new auth to %pM\n", 4593 ifmgd->associated->bssid, req->bss->bssid); 4594 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4595 WLAN_REASON_UNSPECIFIED, 4596 false, frame_buf); 4597 4598 ieee80211_report_disconnect(sdata, frame_buf, 4599 sizeof(frame_buf), true, 4600 WLAN_REASON_UNSPECIFIED); 4601 } 4602 4603 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4604 4605 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4606 if (err) 4607 goto err_clear; 4608 4609 err = ieee80211_auth(sdata); 4610 if (err) { 4611 sta_info_destroy_addr(sdata, req->bss->bssid); 4612 goto err_clear; 4613 } 4614 4615 /* hold our own reference */ 4616 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4617 return 0; 4618 4619 err_clear: 4620 eth_zero_addr(ifmgd->bssid); 4621 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4622 ifmgd->auth_data = NULL; 4623 mutex_lock(&sdata->local->mtx); 4624 ieee80211_vif_release_channel(sdata); 4625 mutex_unlock(&sdata->local->mtx); 4626 err_free: 4627 kfree(auth_data); 4628 return err; 4629 } 4630 4631 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4632 struct cfg80211_assoc_request *req) 4633 { 4634 struct ieee80211_local *local = sdata->local; 4635 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4636 struct ieee80211_bss *bss = (void *)req->bss->priv; 4637 struct ieee80211_mgd_assoc_data *assoc_data; 4638 const struct cfg80211_bss_ies *beacon_ies; 4639 struct ieee80211_supported_band *sband; 4640 const u8 *ssidie, *ht_ie, *vht_ie; 4641 int i, err; 4642 bool override = false; 4643 4644 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4645 if (!assoc_data) 4646 return -ENOMEM; 4647 4648 rcu_read_lock(); 4649 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4650 if (!ssidie) { 4651 rcu_read_unlock(); 4652 kfree(assoc_data); 4653 return -EINVAL; 4654 } 4655 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4656 assoc_data->ssid_len = ssidie[1]; 4657 rcu_read_unlock(); 4658 4659 if (ifmgd->associated) { 4660 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4661 4662 sdata_info(sdata, 4663 "disconnect from AP %pM for new assoc to %pM\n", 4664 ifmgd->associated->bssid, req->bss->bssid); 4665 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4666 WLAN_REASON_UNSPECIFIED, 4667 false, frame_buf); 4668 4669 ieee80211_report_disconnect(sdata, frame_buf, 4670 sizeof(frame_buf), true, 4671 WLAN_REASON_UNSPECIFIED); 4672 } 4673 4674 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4675 err = -EBUSY; 4676 goto err_free; 4677 } 4678 4679 if (ifmgd->assoc_data) { 4680 err = -EBUSY; 4681 goto err_free; 4682 } 4683 4684 if (ifmgd->auth_data) { 4685 bool match; 4686 4687 /* keep sta info, bssid if matching */ 4688 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4689 ieee80211_destroy_auth_data(sdata, match); 4690 } 4691 4692 /* prepare assoc data */ 4693 4694 ifmgd->beacon_crc_valid = false; 4695 4696 assoc_data->wmm = bss->wmm_used && 4697 (local->hw.queues >= IEEE80211_NUM_ACS); 4698 4699 /* 4700 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4701 * We still associate in non-HT mode (11a/b/g) if any one of these 4702 * ciphers is configured as pairwise. 4703 * We can set this to true for non-11n hardware, that'll be checked 4704 * separately along with the peer capabilities. 4705 */ 4706 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4707 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4708 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4709 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4710 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4711 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4712 netdev_info(sdata->dev, 4713 "disabling HT/VHT due to WEP/TKIP use\n"); 4714 } 4715 } 4716 4717 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4718 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4719 if (!sband->ht_cap.ht_supported || 4720 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4721 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4722 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4723 if (!bss->wmm_used && 4724 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4725 netdev_info(sdata->dev, 4726 "disabling HT as WMM/QoS is not supported by the AP\n"); 4727 } 4728 4729 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4730 if (!sband->vht_cap.vht_supported || 4731 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4732 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4733 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4734 if (!bss->wmm_used && 4735 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4736 netdev_info(sdata->dev, 4737 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4738 } 4739 4740 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4741 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4742 sizeof(ifmgd->ht_capa_mask)); 4743 4744 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4745 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4746 sizeof(ifmgd->vht_capa_mask)); 4747 4748 if (req->ie && req->ie_len) { 4749 memcpy(assoc_data->ie, req->ie, req->ie_len); 4750 assoc_data->ie_len = req->ie_len; 4751 } 4752 4753 if (req->fils_kek) { 4754 /* should already be checked in cfg80211 - so warn */ 4755 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) { 4756 err = -EINVAL; 4757 goto err_free; 4758 } 4759 memcpy(assoc_data->fils_kek, req->fils_kek, 4760 req->fils_kek_len); 4761 assoc_data->fils_kek_len = req->fils_kek_len; 4762 } 4763 4764 if (req->fils_nonces) 4765 memcpy(assoc_data->fils_nonces, req->fils_nonces, 4766 2 * FILS_NONCE_LEN); 4767 4768 assoc_data->bss = req->bss; 4769 4770 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4771 if (ifmgd->powersave) 4772 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4773 else 4774 sdata->smps_mode = IEEE80211_SMPS_OFF; 4775 } else 4776 sdata->smps_mode = ifmgd->req_smps; 4777 4778 assoc_data->capability = req->bss->capability; 4779 assoc_data->supp_rates = bss->supp_rates; 4780 assoc_data->supp_rates_len = bss->supp_rates_len; 4781 4782 rcu_read_lock(); 4783 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4784 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4785 assoc_data->ap_ht_param = 4786 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4787 else 4788 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4789 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4790 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4791 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4792 sizeof(struct ieee80211_vht_cap)); 4793 else 4794 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4795 rcu_read_unlock(); 4796 4797 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4798 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4799 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4800 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4801 4802 if (bss->wmm_used && bss->uapsd_supported && 4803 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4804 assoc_data->uapsd = true; 4805 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4806 } else { 4807 assoc_data->uapsd = false; 4808 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4809 } 4810 4811 if (req->prev_bssid) 4812 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4813 4814 if (req->use_mfp) { 4815 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4816 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4817 } else { 4818 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4819 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4820 } 4821 4822 if (req->flags & ASSOC_REQ_USE_RRM) 4823 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4824 else 4825 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4826 4827 if (req->crypto.control_port) 4828 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4829 else 4830 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4831 4832 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4833 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4834 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4835 sdata->vif.type); 4836 4837 /* kick off associate process */ 4838 4839 ifmgd->assoc_data = assoc_data; 4840 ifmgd->dtim_period = 0; 4841 ifmgd->have_beacon = false; 4842 4843 /* override HT/VHT configuration only if the AP and we support it */ 4844 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4845 struct ieee80211_sta_ht_cap sta_ht_cap; 4846 4847 if (req->flags & ASSOC_REQ_DISABLE_HT) 4848 override = true; 4849 4850 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4851 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4852 4853 /* check for 40 MHz disable override */ 4854 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4855 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4856 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4857 override = true; 4858 4859 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4860 req->flags & ASSOC_REQ_DISABLE_VHT) 4861 override = true; 4862 } 4863 4864 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4865 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4866 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4867 } 4868 4869 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4870 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4871 4872 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4873 if (err) 4874 goto err_clear; 4875 4876 rcu_read_lock(); 4877 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4878 4879 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4880 !beacon_ies) { 4881 /* 4882 * Wait up to one beacon interval ... 4883 * should this be more if we miss one? 4884 */ 4885 sdata_info(sdata, "waiting for beacon from %pM\n", 4886 ifmgd->bssid); 4887 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4888 assoc_data->timeout_started = true; 4889 assoc_data->need_beacon = true; 4890 } else if (beacon_ies) { 4891 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4892 beacon_ies->data, 4893 beacon_ies->len); 4894 u8 dtim_count = 0; 4895 4896 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4897 const struct ieee80211_tim_ie *tim; 4898 tim = (void *)(tim_ie + 2); 4899 ifmgd->dtim_period = tim->dtim_period; 4900 dtim_count = tim->dtim_count; 4901 } 4902 ifmgd->have_beacon = true; 4903 assoc_data->timeout = jiffies; 4904 assoc_data->timeout_started = true; 4905 4906 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4907 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4908 sdata->vif.bss_conf.sync_device_ts = 4909 bss->device_ts_beacon; 4910 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4911 } 4912 } else { 4913 assoc_data->timeout = jiffies; 4914 assoc_data->timeout_started = true; 4915 } 4916 rcu_read_unlock(); 4917 4918 run_again(sdata, assoc_data->timeout); 4919 4920 if (bss->corrupt_data) { 4921 char *corrupt_type = "data"; 4922 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4923 if (bss->corrupt_data & 4924 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4925 corrupt_type = "beacon and probe response"; 4926 else 4927 corrupt_type = "beacon"; 4928 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4929 corrupt_type = "probe response"; 4930 sdata_info(sdata, "associating with AP with corrupt %s\n", 4931 corrupt_type); 4932 } 4933 4934 return 0; 4935 err_clear: 4936 eth_zero_addr(ifmgd->bssid); 4937 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4938 ifmgd->assoc_data = NULL; 4939 err_free: 4940 kfree(assoc_data); 4941 return err; 4942 } 4943 4944 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4945 struct cfg80211_deauth_request *req) 4946 { 4947 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4948 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4949 bool tx = !req->local_state_change; 4950 4951 if (ifmgd->auth_data && 4952 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4953 sdata_info(sdata, 4954 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4955 req->bssid, req->reason_code, 4956 ieee80211_get_reason_code_string(req->reason_code)); 4957 4958 drv_mgd_prepare_tx(sdata->local, sdata); 4959 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4960 IEEE80211_STYPE_DEAUTH, 4961 req->reason_code, tx, 4962 frame_buf); 4963 ieee80211_destroy_auth_data(sdata, false); 4964 ieee80211_report_disconnect(sdata, frame_buf, 4965 sizeof(frame_buf), true, 4966 req->reason_code); 4967 4968 return 0; 4969 } 4970 4971 if (ifmgd->assoc_data && 4972 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4973 sdata_info(sdata, 4974 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4975 req->bssid, req->reason_code, 4976 ieee80211_get_reason_code_string(req->reason_code)); 4977 4978 drv_mgd_prepare_tx(sdata->local, sdata); 4979 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4980 IEEE80211_STYPE_DEAUTH, 4981 req->reason_code, tx, 4982 frame_buf); 4983 ieee80211_destroy_assoc_data(sdata, false, true); 4984 ieee80211_report_disconnect(sdata, frame_buf, 4985 sizeof(frame_buf), true, 4986 req->reason_code); 4987 return 0; 4988 } 4989 4990 if (ifmgd->associated && 4991 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4992 sdata_info(sdata, 4993 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4994 req->bssid, req->reason_code, 4995 ieee80211_get_reason_code_string(req->reason_code)); 4996 4997 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4998 req->reason_code, tx, frame_buf); 4999 ieee80211_report_disconnect(sdata, frame_buf, 5000 sizeof(frame_buf), true, 5001 req->reason_code); 5002 return 0; 5003 } 5004 5005 return -ENOTCONN; 5006 } 5007 5008 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 5009 struct cfg80211_disassoc_request *req) 5010 { 5011 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 5012 u8 bssid[ETH_ALEN]; 5013 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 5014 5015 /* 5016 * cfg80211 should catch this ... but it's racy since 5017 * we can receive a disassoc frame, process it, hand it 5018 * to cfg80211 while that's in a locked section already 5019 * trying to tell us that the user wants to disconnect. 5020 */ 5021 if (ifmgd->associated != req->bss) 5022 return -ENOLINK; 5023 5024 sdata_info(sdata, 5025 "disassociating from %pM by local choice (Reason: %u=%s)\n", 5026 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 5027 5028 memcpy(bssid, req->bss->bssid, ETH_ALEN); 5029 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 5030 req->reason_code, !req->local_state_change, 5031 frame_buf); 5032 5033 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 5034 req->reason_code); 5035 5036 return 0; 5037 } 5038 5039 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 5040 { 5041 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 5042 5043 /* 5044 * Make sure some work items will not run after this, 5045 * they will not do anything but might not have been 5046 * cancelled when disconnecting. 5047 */ 5048 cancel_work_sync(&ifmgd->monitor_work); 5049 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 5050 cancel_work_sync(&ifmgd->request_smps_work); 5051 cancel_work_sync(&ifmgd->csa_connection_drop_work); 5052 cancel_work_sync(&ifmgd->chswitch_work); 5053 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 5054 5055 sdata_lock(sdata); 5056 if (ifmgd->assoc_data) { 5057 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 5058 ieee80211_destroy_assoc_data(sdata, false, false); 5059 cfg80211_assoc_timeout(sdata->dev, bss); 5060 } 5061 if (ifmgd->auth_data) 5062 ieee80211_destroy_auth_data(sdata, false); 5063 spin_lock_bh(&ifmgd->teardown_lock); 5064 if (ifmgd->teardown_skb) { 5065 kfree_skb(ifmgd->teardown_skb); 5066 ifmgd->teardown_skb = NULL; 5067 ifmgd->orig_teardown_skb = NULL; 5068 } 5069 spin_unlock_bh(&ifmgd->teardown_lock); 5070 del_timer_sync(&ifmgd->timer); 5071 sdata_unlock(sdata); 5072 } 5073 5074 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 5075 enum nl80211_cqm_rssi_threshold_event rssi_event, 5076 s32 rssi_level, 5077 gfp_t gfp) 5078 { 5079 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5080 5081 trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level); 5082 5083 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp); 5084 } 5085 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5086 5087 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5088 { 5089 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5090 5091 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5092 5093 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5094 } 5095 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5096