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 case IEEE80211_SMPS_OFF: 477 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 478 IEEE80211_HT_CAP_SM_PS_SHIFT; 479 break; 480 case IEEE80211_SMPS_STATIC: 481 cap |= WLAN_HT_CAP_SM_PS_STATIC << 482 IEEE80211_HT_CAP_SM_PS_SHIFT; 483 break; 484 case IEEE80211_SMPS_DYNAMIC: 485 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 486 IEEE80211_HT_CAP_SM_PS_SHIFT; 487 break; 488 } 489 490 /* reserve and fill IE */ 491 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 492 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 493 } 494 495 /* This function determines vht capability flags for the association 496 * and builds the IE. 497 * Note - the function may set the owner of the MU-MIMO capability 498 */ 499 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 500 struct sk_buff *skb, 501 struct ieee80211_supported_band *sband, 502 struct ieee80211_vht_cap *ap_vht_cap) 503 { 504 struct ieee80211_local *local = sdata->local; 505 u8 *pos; 506 u32 cap; 507 struct ieee80211_sta_vht_cap vht_cap; 508 u32 mask, ap_bf_sts, our_bf_sts; 509 510 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 511 512 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 513 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 514 515 /* determine capability flags */ 516 cap = vht_cap.cap; 517 518 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 519 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 520 521 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 522 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 523 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 524 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 525 } 526 527 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 528 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 529 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 530 } 531 532 /* 533 * Some APs apparently get confused if our capabilities are better 534 * than theirs, so restrict what we advertise in the assoc request. 535 */ 536 if (!(ap_vht_cap->vht_cap_info & 537 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 538 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 539 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE); 540 else if (!(ap_vht_cap->vht_cap_info & 541 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE))) 542 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 543 544 /* 545 * If some other vif is using the MU-MIMO capablity we cannot associate 546 * using MU-MIMO - this will lead to contradictions in the group-id 547 * mechanism. 548 * Ownership is defined since association request, in order to avoid 549 * simultaneous associations with MU-MIMO. 550 */ 551 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) { 552 bool disable_mu_mimo = false; 553 struct ieee80211_sub_if_data *other; 554 555 list_for_each_entry_rcu(other, &local->interfaces, list) { 556 if (other->vif.mu_mimo_owner) { 557 disable_mu_mimo = true; 558 break; 559 } 560 } 561 if (disable_mu_mimo) 562 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 563 else 564 sdata->vif.mu_mimo_owner = true; 565 } 566 567 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 568 569 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 570 our_bf_sts = cap & mask; 571 572 if (ap_bf_sts < our_bf_sts) { 573 cap &= ~mask; 574 cap |= ap_bf_sts; 575 } 576 577 /* reserve and fill IE */ 578 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 579 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 580 } 581 582 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 583 { 584 struct ieee80211_local *local = sdata->local; 585 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 586 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 587 struct sk_buff *skb; 588 struct ieee80211_mgmt *mgmt; 589 u8 *pos, qos_info; 590 size_t offset = 0, noffset; 591 int i, count, rates_len, supp_rates_len, shift; 592 u16 capab; 593 struct ieee80211_supported_band *sband; 594 struct ieee80211_chanctx_conf *chanctx_conf; 595 struct ieee80211_channel *chan; 596 u32 rates = 0; 597 598 sdata_assert_lock(sdata); 599 600 rcu_read_lock(); 601 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 602 if (WARN_ON(!chanctx_conf)) { 603 rcu_read_unlock(); 604 return; 605 } 606 chan = chanctx_conf->def.chan; 607 rcu_read_unlock(); 608 sband = local->hw.wiphy->bands[chan->band]; 609 shift = ieee80211_vif_get_shift(&sdata->vif); 610 611 if (assoc_data->supp_rates_len) { 612 /* 613 * Get all rates supported by the device and the AP as 614 * some APs don't like getting a superset of their rates 615 * in the association request (e.g. D-Link DAP 1353 in 616 * b-only mode)... 617 */ 618 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 619 assoc_data->supp_rates, 620 assoc_data->supp_rates_len, 621 &rates); 622 } else { 623 /* 624 * In case AP not provide any supported rates information 625 * before association, we send information element(s) with 626 * all rates that we support. 627 */ 628 rates_len = 0; 629 for (i = 0; i < sband->n_bitrates; i++) { 630 rates |= BIT(i); 631 rates_len++; 632 } 633 } 634 635 skb = alloc_skb(local->hw.extra_tx_headroom + 636 sizeof(*mgmt) + /* bit too much but doesn't matter */ 637 2 + assoc_data->ssid_len + /* SSID */ 638 4 + rates_len + /* (extended) rates */ 639 4 + /* power capability */ 640 2 + 2 * sband->n_channels + /* supported channels */ 641 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 642 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 643 assoc_data->ie_len + /* extra IEs */ 644 (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) + 645 9, /* WMM */ 646 GFP_KERNEL); 647 if (!skb) 648 return; 649 650 skb_reserve(skb, local->hw.extra_tx_headroom); 651 652 capab = WLAN_CAPABILITY_ESS; 653 654 if (sband->band == NL80211_BAND_2GHZ) { 655 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 656 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 657 } 658 659 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 660 capab |= WLAN_CAPABILITY_PRIVACY; 661 662 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 663 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT)) 664 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 665 666 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 667 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 668 669 mgmt = skb_put_zero(skb, 24); 670 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 671 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 672 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 673 674 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 675 skb_put(skb, 10); 676 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 677 IEEE80211_STYPE_REASSOC_REQ); 678 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 679 mgmt->u.reassoc_req.listen_interval = 680 cpu_to_le16(local->hw.conf.listen_interval); 681 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 682 ETH_ALEN); 683 } else { 684 skb_put(skb, 4); 685 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 686 IEEE80211_STYPE_ASSOC_REQ); 687 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 688 mgmt->u.assoc_req.listen_interval = 689 cpu_to_le16(local->hw.conf.listen_interval); 690 } 691 692 /* SSID */ 693 pos = skb_put(skb, 2 + assoc_data->ssid_len); 694 *pos++ = WLAN_EID_SSID; 695 *pos++ = assoc_data->ssid_len; 696 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 697 698 /* add all rates which were marked to be used above */ 699 supp_rates_len = rates_len; 700 if (supp_rates_len > 8) 701 supp_rates_len = 8; 702 703 pos = skb_put(skb, supp_rates_len + 2); 704 *pos++ = WLAN_EID_SUPP_RATES; 705 *pos++ = supp_rates_len; 706 707 count = 0; 708 for (i = 0; i < sband->n_bitrates; i++) { 709 if (BIT(i) & rates) { 710 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 711 5 * (1 << shift)); 712 *pos++ = (u8) rate; 713 if (++count == 8) 714 break; 715 } 716 } 717 718 if (rates_len > count) { 719 pos = skb_put(skb, rates_len - count + 2); 720 *pos++ = WLAN_EID_EXT_SUPP_RATES; 721 *pos++ = rates_len - count; 722 723 for (i++; i < sband->n_bitrates; i++) { 724 if (BIT(i) & rates) { 725 int rate; 726 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 727 5 * (1 << shift)); 728 *pos++ = (u8) rate; 729 } 730 } 731 } 732 733 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 734 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 735 pos = skb_put(skb, 4); 736 *pos++ = WLAN_EID_PWR_CAPABILITY; 737 *pos++ = 2; 738 *pos++ = 0; /* min tx power */ 739 /* max tx power */ 740 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 741 } 742 743 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 744 /* TODO: get this in reg domain format */ 745 pos = skb_put(skb, 2 * sband->n_channels + 2); 746 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 747 *pos++ = 2 * sband->n_channels; 748 for (i = 0; i < sband->n_channels; i++) { 749 *pos++ = ieee80211_frequency_to_channel( 750 sband->channels[i].center_freq); 751 *pos++ = 1; /* one channel in the subband*/ 752 } 753 } 754 755 /* if present, add any custom IEs that go before HT */ 756 if (assoc_data->ie_len) { 757 static const u8 before_ht[] = { 758 WLAN_EID_SSID, 759 WLAN_EID_SUPP_RATES, 760 WLAN_EID_EXT_SUPP_RATES, 761 WLAN_EID_PWR_CAPABILITY, 762 WLAN_EID_SUPPORTED_CHANNELS, 763 WLAN_EID_RSN, 764 WLAN_EID_QOS_CAPA, 765 WLAN_EID_RRM_ENABLED_CAPABILITIES, 766 WLAN_EID_MOBILITY_DOMAIN, 767 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 768 WLAN_EID_RIC_DATA, /* reassoc only */ 769 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 770 }; 771 static const u8 after_ric[] = { 772 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 773 WLAN_EID_HT_CAPABILITY, 774 WLAN_EID_BSS_COEX_2040, 775 /* luckily this is almost always there */ 776 WLAN_EID_EXT_CAPABILITY, 777 WLAN_EID_QOS_TRAFFIC_CAPA, 778 WLAN_EID_TIM_BCAST_REQ, 779 WLAN_EID_INTERWORKING, 780 /* 60 GHz (Multi-band, DMG, MMS) can't happen */ 781 WLAN_EID_VHT_CAPABILITY, 782 WLAN_EID_OPMODE_NOTIF, 783 }; 784 785 noffset = ieee80211_ie_split_ric(assoc_data->ie, 786 assoc_data->ie_len, 787 before_ht, 788 ARRAY_SIZE(before_ht), 789 after_ric, 790 ARRAY_SIZE(after_ric), 791 offset); 792 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 793 offset = noffset; 794 } 795 796 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 797 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 798 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 799 800 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 801 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 802 sband, chan, sdata->smps_mode); 803 804 /* if present, add any custom IEs that go before VHT */ 805 if (assoc_data->ie_len) { 806 static const u8 before_vht[] = { 807 /* 808 * no need to list the ones split off before HT 809 * or generated here 810 */ 811 WLAN_EID_BSS_COEX_2040, 812 WLAN_EID_EXT_CAPABILITY, 813 WLAN_EID_QOS_TRAFFIC_CAPA, 814 WLAN_EID_TIM_BCAST_REQ, 815 WLAN_EID_INTERWORKING, 816 /* 60 GHz (Multi-band, DMG, MMS) can't happen */ 817 }; 818 819 /* RIC already taken above, so no need to handle here anymore */ 820 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 821 before_vht, ARRAY_SIZE(before_vht), 822 offset); 823 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 824 offset = noffset; 825 } 826 827 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 828 ieee80211_add_vht_ie(sdata, skb, sband, 829 &assoc_data->ap_vht_cap); 830 831 /* if present, add any custom non-vendor IEs that go after HT */ 832 if (assoc_data->ie_len) { 833 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 834 assoc_data->ie_len, 835 offset); 836 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 837 offset = noffset; 838 } 839 840 if (assoc_data->wmm) { 841 if (assoc_data->uapsd) { 842 qos_info = ifmgd->uapsd_queues; 843 qos_info |= (ifmgd->uapsd_max_sp_len << 844 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 845 } else { 846 qos_info = 0; 847 } 848 849 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 850 } 851 852 /* add any remaining custom (i.e. vendor specific here) IEs */ 853 if (assoc_data->ie_len) { 854 noffset = assoc_data->ie_len; 855 skb_put_data(skb, assoc_data->ie + offset, noffset - offset); 856 } 857 858 if (assoc_data->fils_kek_len && 859 fils_encrypt_assoc_req(skb, assoc_data) < 0) { 860 dev_kfree_skb(skb); 861 return; 862 } 863 864 drv_mgd_prepare_tx(local, sdata); 865 866 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 867 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 868 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 869 IEEE80211_TX_INTFL_MLME_CONN_TX; 870 ieee80211_tx_skb(sdata, skb); 871 } 872 873 void ieee80211_send_pspoll(struct ieee80211_local *local, 874 struct ieee80211_sub_if_data *sdata) 875 { 876 struct ieee80211_pspoll *pspoll; 877 struct sk_buff *skb; 878 879 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 880 if (!skb) 881 return; 882 883 pspoll = (struct ieee80211_pspoll *) skb->data; 884 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 885 886 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 887 ieee80211_tx_skb(sdata, skb); 888 } 889 890 void ieee80211_send_nullfunc(struct ieee80211_local *local, 891 struct ieee80211_sub_if_data *sdata, 892 bool powersave) 893 { 894 struct sk_buff *skb; 895 struct ieee80211_hdr_3addr *nullfunc; 896 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 897 898 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 899 if (!skb) 900 return; 901 902 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 903 if (powersave) 904 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 905 906 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 907 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 908 909 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 910 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 911 912 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 913 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 914 915 ieee80211_tx_skb(sdata, skb); 916 } 917 918 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 919 struct ieee80211_sub_if_data *sdata) 920 { 921 struct sk_buff *skb; 922 struct ieee80211_hdr *nullfunc; 923 __le16 fc; 924 925 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 926 return; 927 928 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 929 if (!skb) 930 return; 931 932 skb_reserve(skb, local->hw.extra_tx_headroom); 933 934 nullfunc = skb_put_zero(skb, 30); 935 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 936 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 937 nullfunc->frame_control = fc; 938 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 939 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 940 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 941 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 942 943 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 944 ieee80211_tx_skb(sdata, skb); 945 } 946 947 /* spectrum management related things */ 948 static void ieee80211_chswitch_work(struct work_struct *work) 949 { 950 struct ieee80211_sub_if_data *sdata = 951 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 952 struct ieee80211_local *local = sdata->local; 953 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 954 int ret; 955 956 if (!ieee80211_sdata_running(sdata)) 957 return; 958 959 sdata_lock(sdata); 960 mutex_lock(&local->mtx); 961 mutex_lock(&local->chanctx_mtx); 962 963 if (!ifmgd->associated) 964 goto out; 965 966 if (!sdata->vif.csa_active) 967 goto out; 968 969 /* 970 * using reservation isn't immediate as it may be deferred until later 971 * with multi-vif. once reservation is complete it will re-schedule the 972 * work with no reserved_chanctx so verify chandef to check if it 973 * completed successfully 974 */ 975 976 if (sdata->reserved_chanctx) { 977 /* 978 * with multi-vif csa driver may call ieee80211_csa_finish() 979 * many times while waiting for other interfaces to use their 980 * reservations 981 */ 982 if (sdata->reserved_ready) 983 goto out; 984 985 ret = ieee80211_vif_use_reserved_context(sdata); 986 if (ret) { 987 sdata_info(sdata, 988 "failed to use reserved channel context, disconnecting (err=%d)\n", 989 ret); 990 ieee80211_queue_work(&sdata->local->hw, 991 &ifmgd->csa_connection_drop_work); 992 goto out; 993 } 994 995 goto out; 996 } 997 998 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 999 &sdata->csa_chandef)) { 1000 sdata_info(sdata, 1001 "failed to finalize channel switch, disconnecting\n"); 1002 ieee80211_queue_work(&sdata->local->hw, 1003 &ifmgd->csa_connection_drop_work); 1004 goto out; 1005 } 1006 1007 /* XXX: shouldn't really modify cfg80211-owned data! */ 1008 ifmgd->associated->channel = sdata->csa_chandef.chan; 1009 1010 ifmgd->csa_waiting_bcn = true; 1011 1012 ieee80211_sta_reset_beacon_monitor(sdata); 1013 ieee80211_sta_reset_conn_monitor(sdata); 1014 1015 out: 1016 mutex_unlock(&local->chanctx_mtx); 1017 mutex_unlock(&local->mtx); 1018 sdata_unlock(sdata); 1019 } 1020 1021 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1022 { 1023 struct ieee80211_local *local = sdata->local; 1024 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1025 int ret; 1026 1027 sdata_assert_lock(sdata); 1028 1029 WARN_ON(!sdata->vif.csa_active); 1030 1031 if (sdata->csa_block_tx) { 1032 ieee80211_wake_vif_queues(local, sdata, 1033 IEEE80211_QUEUE_STOP_REASON_CSA); 1034 sdata->csa_block_tx = false; 1035 } 1036 1037 sdata->vif.csa_active = false; 1038 ifmgd->csa_waiting_bcn = false; 1039 1040 ret = drv_post_channel_switch(sdata); 1041 if (ret) { 1042 sdata_info(sdata, 1043 "driver post channel switch failed, disconnecting\n"); 1044 ieee80211_queue_work(&local->hw, 1045 &ifmgd->csa_connection_drop_work); 1046 return; 1047 } 1048 1049 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1050 } 1051 1052 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1053 { 1054 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1055 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1056 1057 trace_api_chswitch_done(sdata, success); 1058 if (!success) { 1059 sdata_info(sdata, 1060 "driver channel switch failed, disconnecting\n"); 1061 ieee80211_queue_work(&sdata->local->hw, 1062 &ifmgd->csa_connection_drop_work); 1063 } else { 1064 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1065 } 1066 } 1067 EXPORT_SYMBOL(ieee80211_chswitch_done); 1068 1069 static void ieee80211_chswitch_timer(unsigned long data) 1070 { 1071 struct ieee80211_sub_if_data *sdata = 1072 (struct ieee80211_sub_if_data *) data; 1073 1074 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1075 } 1076 1077 static void 1078 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1079 u64 timestamp, u32 device_timestamp, 1080 struct ieee802_11_elems *elems, 1081 bool beacon) 1082 { 1083 struct ieee80211_local *local = sdata->local; 1084 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1085 struct cfg80211_bss *cbss = ifmgd->associated; 1086 struct ieee80211_chanctx_conf *conf; 1087 struct ieee80211_chanctx *chanctx; 1088 enum nl80211_band current_band; 1089 struct ieee80211_csa_ie csa_ie; 1090 struct ieee80211_channel_switch ch_switch; 1091 int res; 1092 1093 sdata_assert_lock(sdata); 1094 1095 if (!cbss) 1096 return; 1097 1098 if (local->scanning) 1099 return; 1100 1101 /* disregard subsequent announcements if we are already processing */ 1102 if (sdata->vif.csa_active) 1103 return; 1104 1105 current_band = cbss->channel->band; 1106 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1107 ifmgd->flags, 1108 ifmgd->associated->bssid, &csa_ie); 1109 if (res < 0) 1110 ieee80211_queue_work(&local->hw, 1111 &ifmgd->csa_connection_drop_work); 1112 if (res) 1113 return; 1114 1115 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1116 IEEE80211_CHAN_DISABLED)) { 1117 sdata_info(sdata, 1118 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1119 ifmgd->associated->bssid, 1120 csa_ie.chandef.chan->center_freq, 1121 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1122 csa_ie.chandef.center_freq2); 1123 ieee80211_queue_work(&local->hw, 1124 &ifmgd->csa_connection_drop_work); 1125 return; 1126 } 1127 1128 if (cfg80211_chandef_identical(&csa_ie.chandef, 1129 &sdata->vif.bss_conf.chandef)) { 1130 if (ifmgd->csa_ignored_same_chan) 1131 return; 1132 sdata_info(sdata, 1133 "AP %pM tries to chanswitch to same channel, ignore\n", 1134 ifmgd->associated->bssid); 1135 ifmgd->csa_ignored_same_chan = true; 1136 return; 1137 } 1138 1139 /* 1140 * Drop all TDLS peers - either we disconnect or move to a different 1141 * channel from this point on. There's no telling what our peer will do. 1142 * The TDLS WIDER_BW scenario is also problematic, as peers might now 1143 * have an incompatible wider chandef. 1144 */ 1145 ieee80211_teardown_tdls_peers(sdata); 1146 1147 mutex_lock(&local->mtx); 1148 mutex_lock(&local->chanctx_mtx); 1149 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1150 lockdep_is_held(&local->chanctx_mtx)); 1151 if (!conf) { 1152 sdata_info(sdata, 1153 "no channel context assigned to vif?, disconnecting\n"); 1154 goto drop_connection; 1155 } 1156 1157 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1158 1159 if (local->use_chanctx && 1160 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) { 1161 sdata_info(sdata, 1162 "driver doesn't support chan-switch with channel contexts\n"); 1163 goto drop_connection; 1164 } 1165 1166 ch_switch.timestamp = timestamp; 1167 ch_switch.device_timestamp = device_timestamp; 1168 ch_switch.block_tx = csa_ie.mode; 1169 ch_switch.chandef = csa_ie.chandef; 1170 ch_switch.count = csa_ie.count; 1171 1172 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1173 sdata_info(sdata, 1174 "preparing for channel switch failed, disconnecting\n"); 1175 goto drop_connection; 1176 } 1177 1178 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1179 chanctx->mode, false); 1180 if (res) { 1181 sdata_info(sdata, 1182 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1183 res); 1184 goto drop_connection; 1185 } 1186 mutex_unlock(&local->chanctx_mtx); 1187 1188 sdata->vif.csa_active = true; 1189 sdata->csa_chandef = csa_ie.chandef; 1190 sdata->csa_block_tx = csa_ie.mode; 1191 ifmgd->csa_ignored_same_chan = false; 1192 1193 if (sdata->csa_block_tx) 1194 ieee80211_stop_vif_queues(local, sdata, 1195 IEEE80211_QUEUE_STOP_REASON_CSA); 1196 mutex_unlock(&local->mtx); 1197 1198 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1199 csa_ie.count); 1200 1201 if (local->ops->channel_switch) { 1202 /* use driver's channel switch callback */ 1203 drv_channel_switch(local, sdata, &ch_switch); 1204 return; 1205 } 1206 1207 /* channel switch handled in software */ 1208 if (csa_ie.count <= 1) 1209 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1210 else 1211 mod_timer(&ifmgd->chswitch_timer, 1212 TU_TO_EXP_TIME((csa_ie.count - 1) * 1213 cbss->beacon_interval)); 1214 return; 1215 drop_connection: 1216 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); 1217 mutex_unlock(&local->chanctx_mtx); 1218 mutex_unlock(&local->mtx); 1219 } 1220 1221 static bool 1222 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1223 struct ieee80211_channel *channel, 1224 const u8 *country_ie, u8 country_ie_len, 1225 const u8 *pwr_constr_elem, 1226 int *chan_pwr, int *pwr_reduction) 1227 { 1228 struct ieee80211_country_ie_triplet *triplet; 1229 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1230 int i, chan_increment; 1231 bool have_chan_pwr = false; 1232 1233 /* Invalid IE */ 1234 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1235 return false; 1236 1237 triplet = (void *)(country_ie + 3); 1238 country_ie_len -= 3; 1239 1240 switch (channel->band) { 1241 default: 1242 WARN_ON_ONCE(1); 1243 /* fall through */ 1244 case NL80211_BAND_2GHZ: 1245 case NL80211_BAND_60GHZ: 1246 chan_increment = 1; 1247 break; 1248 case NL80211_BAND_5GHZ: 1249 chan_increment = 4; 1250 break; 1251 } 1252 1253 /* find channel */ 1254 while (country_ie_len >= 3) { 1255 u8 first_channel = triplet->chans.first_channel; 1256 1257 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1258 goto next; 1259 1260 for (i = 0; i < triplet->chans.num_channels; i++) { 1261 if (first_channel + i * chan_increment == chan) { 1262 have_chan_pwr = true; 1263 *chan_pwr = triplet->chans.max_power; 1264 break; 1265 } 1266 } 1267 if (have_chan_pwr) 1268 break; 1269 1270 next: 1271 triplet++; 1272 country_ie_len -= 3; 1273 } 1274 1275 if (have_chan_pwr && pwr_constr_elem) 1276 *pwr_reduction = *pwr_constr_elem; 1277 else 1278 *pwr_reduction = 0; 1279 1280 return have_chan_pwr; 1281 } 1282 1283 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1284 struct ieee80211_channel *channel, 1285 const u8 *cisco_dtpc_ie, 1286 int *pwr_level) 1287 { 1288 /* From practical testing, the first data byte of the DTPC element 1289 * seems to contain the requested dBm level, and the CLI on Cisco 1290 * APs clearly state the range is -127 to 127 dBm, which indicates 1291 * a signed byte, although it seemingly never actually goes negative. 1292 * The other byte seems to always be zero. 1293 */ 1294 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1295 } 1296 1297 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1298 struct ieee80211_channel *channel, 1299 struct ieee80211_mgmt *mgmt, 1300 const u8 *country_ie, u8 country_ie_len, 1301 const u8 *pwr_constr_ie, 1302 const u8 *cisco_dtpc_ie) 1303 { 1304 bool has_80211h_pwr = false, has_cisco_pwr = false; 1305 int chan_pwr = 0, pwr_reduction_80211h = 0; 1306 int pwr_level_cisco, pwr_level_80211h; 1307 int new_ap_level; 1308 __le16 capab = mgmt->u.probe_resp.capab_info; 1309 1310 if (country_ie && 1311 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1312 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1313 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1314 sdata, channel, country_ie, country_ie_len, 1315 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1316 pwr_level_80211h = 1317 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1318 } 1319 1320 if (cisco_dtpc_ie) { 1321 ieee80211_find_cisco_dtpc( 1322 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1323 has_cisco_pwr = true; 1324 } 1325 1326 if (!has_80211h_pwr && !has_cisco_pwr) 1327 return 0; 1328 1329 /* If we have both 802.11h and Cisco DTPC, apply both limits 1330 * by picking the smallest of the two power levels advertised. 1331 */ 1332 if (has_80211h_pwr && 1333 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1334 new_ap_level = pwr_level_80211h; 1335 1336 if (sdata->ap_power_level == new_ap_level) 1337 return 0; 1338 1339 sdata_dbg(sdata, 1340 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1341 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1342 sdata->u.mgd.bssid); 1343 } else { /* has_cisco_pwr is always true here. */ 1344 new_ap_level = pwr_level_cisco; 1345 1346 if (sdata->ap_power_level == new_ap_level) 1347 return 0; 1348 1349 sdata_dbg(sdata, 1350 "Limiting TX power to %d dBm as advertised by %pM\n", 1351 pwr_level_cisco, sdata->u.mgd.bssid); 1352 } 1353 1354 sdata->ap_power_level = new_ap_level; 1355 if (__ieee80211_recalc_txpower(sdata)) 1356 return BSS_CHANGED_TXPOWER; 1357 return 0; 1358 } 1359 1360 /* powersave */ 1361 static void ieee80211_enable_ps(struct ieee80211_local *local, 1362 struct ieee80211_sub_if_data *sdata) 1363 { 1364 struct ieee80211_conf *conf = &local->hw.conf; 1365 1366 /* 1367 * If we are scanning right now then the parameters will 1368 * take effect when scan finishes. 1369 */ 1370 if (local->scanning) 1371 return; 1372 1373 if (conf->dynamic_ps_timeout > 0 && 1374 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1375 mod_timer(&local->dynamic_ps_timer, jiffies + 1376 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1377 } else { 1378 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1379 ieee80211_send_nullfunc(local, sdata, true); 1380 1381 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1382 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1383 return; 1384 1385 conf->flags |= IEEE80211_CONF_PS; 1386 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1387 } 1388 } 1389 1390 static void ieee80211_change_ps(struct ieee80211_local *local) 1391 { 1392 struct ieee80211_conf *conf = &local->hw.conf; 1393 1394 if (local->ps_sdata) { 1395 ieee80211_enable_ps(local, local->ps_sdata); 1396 } else if (conf->flags & IEEE80211_CONF_PS) { 1397 conf->flags &= ~IEEE80211_CONF_PS; 1398 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1399 del_timer_sync(&local->dynamic_ps_timer); 1400 cancel_work_sync(&local->dynamic_ps_enable_work); 1401 } 1402 } 1403 1404 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1405 { 1406 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1407 struct sta_info *sta = NULL; 1408 bool authorized = false; 1409 1410 if (!mgd->powersave) 1411 return false; 1412 1413 if (mgd->broken_ap) 1414 return false; 1415 1416 if (!mgd->associated) 1417 return false; 1418 1419 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1420 return false; 1421 1422 if (!mgd->have_beacon) 1423 return false; 1424 1425 rcu_read_lock(); 1426 sta = sta_info_get(sdata, mgd->bssid); 1427 if (sta) 1428 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1429 rcu_read_unlock(); 1430 1431 return authorized; 1432 } 1433 1434 /* need to hold RTNL or interface lock */ 1435 void ieee80211_recalc_ps(struct ieee80211_local *local) 1436 { 1437 struct ieee80211_sub_if_data *sdata, *found = NULL; 1438 int count = 0; 1439 int timeout; 1440 1441 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1442 local->ps_sdata = NULL; 1443 return; 1444 } 1445 1446 list_for_each_entry(sdata, &local->interfaces, list) { 1447 if (!ieee80211_sdata_running(sdata)) 1448 continue; 1449 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1450 /* If an AP vif is found, then disable PS 1451 * by setting the count to zero thereby setting 1452 * ps_sdata to NULL. 1453 */ 1454 count = 0; 1455 break; 1456 } 1457 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1458 continue; 1459 found = sdata; 1460 count++; 1461 } 1462 1463 if (count == 1 && ieee80211_powersave_allowed(found)) { 1464 u8 dtimper = found->u.mgd.dtim_period; 1465 1466 timeout = local->dynamic_ps_forced_timeout; 1467 if (timeout < 0) 1468 timeout = 100; 1469 local->hw.conf.dynamic_ps_timeout = timeout; 1470 1471 /* If the TIM IE is invalid, pretend the value is 1 */ 1472 if (!dtimper) 1473 dtimper = 1; 1474 1475 local->hw.conf.ps_dtim_period = dtimper; 1476 local->ps_sdata = found; 1477 } else { 1478 local->ps_sdata = NULL; 1479 } 1480 1481 ieee80211_change_ps(local); 1482 } 1483 1484 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1485 { 1486 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1487 1488 if (sdata->vif.bss_conf.ps != ps_allowed) { 1489 sdata->vif.bss_conf.ps = ps_allowed; 1490 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1491 } 1492 } 1493 1494 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1495 { 1496 struct ieee80211_local *local = 1497 container_of(work, struct ieee80211_local, 1498 dynamic_ps_disable_work); 1499 1500 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1501 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1502 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1503 } 1504 1505 ieee80211_wake_queues_by_reason(&local->hw, 1506 IEEE80211_MAX_QUEUE_MAP, 1507 IEEE80211_QUEUE_STOP_REASON_PS, 1508 false); 1509 } 1510 1511 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1512 { 1513 struct ieee80211_local *local = 1514 container_of(work, struct ieee80211_local, 1515 dynamic_ps_enable_work); 1516 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1517 struct ieee80211_if_managed *ifmgd; 1518 unsigned long flags; 1519 int q; 1520 1521 /* can only happen when PS was just disabled anyway */ 1522 if (!sdata) 1523 return; 1524 1525 ifmgd = &sdata->u.mgd; 1526 1527 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1528 return; 1529 1530 if (local->hw.conf.dynamic_ps_timeout > 0) { 1531 /* don't enter PS if TX frames are pending */ 1532 if (drv_tx_frames_pending(local)) { 1533 mod_timer(&local->dynamic_ps_timer, jiffies + 1534 msecs_to_jiffies( 1535 local->hw.conf.dynamic_ps_timeout)); 1536 return; 1537 } 1538 1539 /* 1540 * transmission can be stopped by others which leads to 1541 * dynamic_ps_timer expiry. Postpone the ps timer if it 1542 * is not the actual idle state. 1543 */ 1544 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1545 for (q = 0; q < local->hw.queues; q++) { 1546 if (local->queue_stop_reasons[q]) { 1547 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1548 flags); 1549 mod_timer(&local->dynamic_ps_timer, jiffies + 1550 msecs_to_jiffies( 1551 local->hw.conf.dynamic_ps_timeout)); 1552 return; 1553 } 1554 } 1555 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1556 } 1557 1558 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1559 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1560 if (drv_tx_frames_pending(local)) { 1561 mod_timer(&local->dynamic_ps_timer, jiffies + 1562 msecs_to_jiffies( 1563 local->hw.conf.dynamic_ps_timeout)); 1564 } else { 1565 ieee80211_send_nullfunc(local, sdata, true); 1566 /* Flush to get the tx status of nullfunc frame */ 1567 ieee80211_flush_queues(local, sdata, false); 1568 } 1569 } 1570 1571 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1572 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1573 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1574 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1575 local->hw.conf.flags |= IEEE80211_CONF_PS; 1576 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1577 } 1578 } 1579 1580 void ieee80211_dynamic_ps_timer(unsigned long data) 1581 { 1582 struct ieee80211_local *local = (void *) data; 1583 1584 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1585 } 1586 1587 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1588 { 1589 struct delayed_work *delayed_work = to_delayed_work(work); 1590 struct ieee80211_sub_if_data *sdata = 1591 container_of(delayed_work, struct ieee80211_sub_if_data, 1592 dfs_cac_timer_work); 1593 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1594 1595 mutex_lock(&sdata->local->mtx); 1596 if (sdata->wdev.cac_started) { 1597 ieee80211_vif_release_channel(sdata); 1598 cfg80211_cac_event(sdata->dev, &chandef, 1599 NL80211_RADAR_CAC_FINISHED, 1600 GFP_KERNEL); 1601 } 1602 mutex_unlock(&sdata->local->mtx); 1603 } 1604 1605 static bool 1606 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1607 { 1608 struct ieee80211_local *local = sdata->local; 1609 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1610 bool ret = false; 1611 int ac; 1612 1613 if (local->hw.queues < IEEE80211_NUM_ACS) 1614 return false; 1615 1616 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1617 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1618 int non_acm_ac; 1619 unsigned long now = jiffies; 1620 1621 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1622 tx_tspec->admitted_time && 1623 time_after(now, tx_tspec->time_slice_start + HZ)) { 1624 tx_tspec->consumed_tx_time = 0; 1625 tx_tspec->time_slice_start = now; 1626 1627 if (tx_tspec->downgraded) 1628 tx_tspec->action = 1629 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1630 } 1631 1632 switch (tx_tspec->action) { 1633 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1634 /* take the original parameters */ 1635 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1636 sdata_err(sdata, 1637 "failed to set TX queue parameters for queue %d\n", 1638 ac); 1639 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1640 tx_tspec->downgraded = false; 1641 ret = true; 1642 break; 1643 case TX_TSPEC_ACTION_DOWNGRADE: 1644 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1645 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1646 ret = true; 1647 break; 1648 } 1649 /* downgrade next lower non-ACM AC */ 1650 for (non_acm_ac = ac + 1; 1651 non_acm_ac < IEEE80211_NUM_ACS; 1652 non_acm_ac++) 1653 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1654 break; 1655 /* Usually the loop will result in using BK even if it 1656 * requires admission control, but such a configuration 1657 * makes no sense and we have to transmit somehow - the 1658 * AC selection does the same thing. 1659 * If we started out trying to downgrade from BK, then 1660 * the extra condition here might be needed. 1661 */ 1662 if (non_acm_ac >= IEEE80211_NUM_ACS) 1663 non_acm_ac = IEEE80211_AC_BK; 1664 if (drv_conf_tx(local, sdata, ac, 1665 &sdata->tx_conf[non_acm_ac])) 1666 sdata_err(sdata, 1667 "failed to set TX queue parameters for queue %d\n", 1668 ac); 1669 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1670 ret = true; 1671 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1672 tx_tspec->time_slice_start + HZ - now + 1); 1673 break; 1674 case TX_TSPEC_ACTION_NONE: 1675 /* nothing now */ 1676 break; 1677 } 1678 } 1679 1680 return ret; 1681 } 1682 1683 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1684 { 1685 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1686 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1687 } 1688 1689 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1690 { 1691 struct ieee80211_sub_if_data *sdata; 1692 1693 sdata = container_of(work, struct ieee80211_sub_if_data, 1694 u.mgd.tx_tspec_wk.work); 1695 ieee80211_sta_handle_tspec_ac_params(sdata); 1696 } 1697 1698 /* MLME */ 1699 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1700 struct ieee80211_sub_if_data *sdata, 1701 const u8 *wmm_param, size_t wmm_param_len) 1702 { 1703 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1704 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1705 size_t left; 1706 int count, ac; 1707 const u8 *pos; 1708 u8 uapsd_queues = 0; 1709 1710 if (!local->ops->conf_tx) 1711 return false; 1712 1713 if (local->hw.queues < IEEE80211_NUM_ACS) 1714 return false; 1715 1716 if (!wmm_param) 1717 return false; 1718 1719 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1720 return false; 1721 1722 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1723 uapsd_queues = ifmgd->uapsd_queues; 1724 1725 count = wmm_param[6] & 0x0f; 1726 if (count == ifmgd->wmm_last_param_set) 1727 return false; 1728 ifmgd->wmm_last_param_set = count; 1729 1730 pos = wmm_param + 8; 1731 left = wmm_param_len - 8; 1732 1733 memset(¶ms, 0, sizeof(params)); 1734 1735 sdata->wmm_acm = 0; 1736 for (; left >= 4; left -= 4, pos += 4) { 1737 int aci = (pos[0] >> 5) & 0x03; 1738 int acm = (pos[0] >> 4) & 0x01; 1739 bool uapsd = false; 1740 1741 switch (aci) { 1742 case 1: /* AC_BK */ 1743 ac = IEEE80211_AC_BK; 1744 if (acm) 1745 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1746 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1747 uapsd = true; 1748 break; 1749 case 2: /* AC_VI */ 1750 ac = IEEE80211_AC_VI; 1751 if (acm) 1752 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1753 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1754 uapsd = true; 1755 break; 1756 case 3: /* AC_VO */ 1757 ac = IEEE80211_AC_VO; 1758 if (acm) 1759 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1760 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1761 uapsd = true; 1762 break; 1763 case 0: /* AC_BE */ 1764 default: 1765 ac = IEEE80211_AC_BE; 1766 if (acm) 1767 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1768 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1769 uapsd = true; 1770 break; 1771 } 1772 1773 params[ac].aifs = pos[0] & 0x0f; 1774 1775 if (params[ac].aifs < 2) { 1776 sdata_info(sdata, 1777 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1778 params[ac].aifs, aci); 1779 params[ac].aifs = 2; 1780 } 1781 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1782 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1783 params[ac].txop = get_unaligned_le16(pos + 2); 1784 params[ac].acm = acm; 1785 params[ac].uapsd = uapsd; 1786 1787 if (params[ac].cw_min > params[ac].cw_max) { 1788 sdata_info(sdata, 1789 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1790 params[ac].cw_min, params[ac].cw_max, aci); 1791 return false; 1792 } 1793 } 1794 1795 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1796 mlme_dbg(sdata, 1797 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1798 ac, params[ac].acm, 1799 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1800 params[ac].txop, params[ac].uapsd, 1801 ifmgd->tx_tspec[ac].downgraded); 1802 sdata->tx_conf[ac] = params[ac]; 1803 if (!ifmgd->tx_tspec[ac].downgraded && 1804 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1805 sdata_err(sdata, 1806 "failed to set TX queue parameters for AC %d\n", 1807 ac); 1808 } 1809 1810 /* enable WMM or activate new settings */ 1811 sdata->vif.bss_conf.qos = true; 1812 return true; 1813 } 1814 1815 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1816 { 1817 lockdep_assert_held(&sdata->local->mtx); 1818 1819 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1820 ieee80211_run_deferred_scan(sdata->local); 1821 } 1822 1823 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1824 { 1825 mutex_lock(&sdata->local->mtx); 1826 __ieee80211_stop_poll(sdata); 1827 mutex_unlock(&sdata->local->mtx); 1828 } 1829 1830 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1831 u16 capab, bool erp_valid, u8 erp) 1832 { 1833 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1834 struct ieee80211_supported_band *sband; 1835 u32 changed = 0; 1836 bool use_protection; 1837 bool use_short_preamble; 1838 bool use_short_slot; 1839 1840 sband = ieee80211_get_sband(sdata); 1841 if (!sband) 1842 return changed; 1843 1844 if (erp_valid) { 1845 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1846 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1847 } else { 1848 use_protection = false; 1849 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1850 } 1851 1852 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1853 if (sband->band == NL80211_BAND_5GHZ) 1854 use_short_slot = true; 1855 1856 if (use_protection != bss_conf->use_cts_prot) { 1857 bss_conf->use_cts_prot = use_protection; 1858 changed |= BSS_CHANGED_ERP_CTS_PROT; 1859 } 1860 1861 if (use_short_preamble != bss_conf->use_short_preamble) { 1862 bss_conf->use_short_preamble = use_short_preamble; 1863 changed |= BSS_CHANGED_ERP_PREAMBLE; 1864 } 1865 1866 if (use_short_slot != bss_conf->use_short_slot) { 1867 bss_conf->use_short_slot = use_short_slot; 1868 changed |= BSS_CHANGED_ERP_SLOT; 1869 } 1870 1871 return changed; 1872 } 1873 1874 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1875 struct cfg80211_bss *cbss, 1876 u32 bss_info_changed) 1877 { 1878 struct ieee80211_bss *bss = (void *)cbss->priv; 1879 struct ieee80211_local *local = sdata->local; 1880 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1881 1882 bss_info_changed |= BSS_CHANGED_ASSOC; 1883 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1884 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1885 1886 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1887 beacon_loss_count * bss_conf->beacon_int)); 1888 1889 sdata->u.mgd.associated = cbss; 1890 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1891 1892 ieee80211_check_rate_mask(sdata); 1893 1894 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1895 1896 if (sdata->vif.p2p || 1897 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1898 const struct cfg80211_bss_ies *ies; 1899 1900 rcu_read_lock(); 1901 ies = rcu_dereference(cbss->ies); 1902 if (ies) { 1903 int ret; 1904 1905 ret = cfg80211_get_p2p_attr( 1906 ies->data, ies->len, 1907 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1908 (u8 *) &bss_conf->p2p_noa_attr, 1909 sizeof(bss_conf->p2p_noa_attr)); 1910 if (ret >= 2) { 1911 sdata->u.mgd.p2p_noa_index = 1912 bss_conf->p2p_noa_attr.index; 1913 bss_info_changed |= BSS_CHANGED_P2P_PS; 1914 } 1915 } 1916 rcu_read_unlock(); 1917 } 1918 1919 /* just to be sure */ 1920 ieee80211_stop_poll(sdata); 1921 1922 ieee80211_led_assoc(local, 1); 1923 1924 if (sdata->u.mgd.have_beacon) { 1925 /* 1926 * If the AP is buggy we may get here with no DTIM period 1927 * known, so assume it's 1 which is the only safe assumption 1928 * in that case, although if the TIM IE is broken powersave 1929 * probably just won't work at all. 1930 */ 1931 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1932 bss_conf->beacon_rate = bss->beacon_rate; 1933 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1934 } else { 1935 bss_conf->beacon_rate = NULL; 1936 bss_conf->dtim_period = 0; 1937 } 1938 1939 bss_conf->assoc = 1; 1940 1941 /* Tell the driver to monitor connection quality (if supported) */ 1942 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1943 bss_conf->cqm_rssi_thold) 1944 bss_info_changed |= BSS_CHANGED_CQM; 1945 1946 /* Enable ARP filtering */ 1947 if (bss_conf->arp_addr_cnt) 1948 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1949 1950 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1951 1952 mutex_lock(&local->iflist_mtx); 1953 ieee80211_recalc_ps(local); 1954 mutex_unlock(&local->iflist_mtx); 1955 1956 ieee80211_recalc_smps(sdata); 1957 ieee80211_recalc_ps_vif(sdata); 1958 1959 netif_carrier_on(sdata->dev); 1960 } 1961 1962 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1963 u16 stype, u16 reason, bool tx, 1964 u8 *frame_buf) 1965 { 1966 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1967 struct ieee80211_local *local = sdata->local; 1968 u32 changed = 0; 1969 1970 sdata_assert_lock(sdata); 1971 1972 if (WARN_ON_ONCE(tx && !frame_buf)) 1973 return; 1974 1975 if (WARN_ON(!ifmgd->associated)) 1976 return; 1977 1978 ieee80211_stop_poll(sdata); 1979 1980 ifmgd->associated = NULL; 1981 netif_carrier_off(sdata->dev); 1982 1983 /* 1984 * if we want to get out of ps before disassoc (why?) we have 1985 * to do it before sending disassoc, as otherwise the null-packet 1986 * won't be valid. 1987 */ 1988 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1989 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1990 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1991 } 1992 local->ps_sdata = NULL; 1993 1994 /* disable per-vif ps */ 1995 ieee80211_recalc_ps_vif(sdata); 1996 1997 /* make sure ongoing transmission finishes */ 1998 synchronize_net(); 1999 2000 /* 2001 * drop any frame before deauth/disassoc, this can be data or 2002 * management frame. Since we are disconnecting, we should not 2003 * insist sending these frames which can take time and delay 2004 * the disconnection and possible the roaming. 2005 */ 2006 if (tx) 2007 ieee80211_flush_queues(local, sdata, true); 2008 2009 /* deauthenticate/disassociate now */ 2010 if (tx || frame_buf) 2011 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2012 reason, tx, frame_buf); 2013 2014 /* flush out frame - make sure the deauth was actually sent */ 2015 if (tx) 2016 ieee80211_flush_queues(local, sdata, false); 2017 2018 /* clear bssid only after building the needed mgmt frames */ 2019 eth_zero_addr(ifmgd->bssid); 2020 2021 /* remove AP and TDLS peers */ 2022 sta_info_flush(sdata); 2023 2024 /* finally reset all BSS / config parameters */ 2025 changed |= ieee80211_reset_erp_info(sdata); 2026 2027 ieee80211_led_assoc(local, 0); 2028 changed |= BSS_CHANGED_ASSOC; 2029 sdata->vif.bss_conf.assoc = false; 2030 2031 ifmgd->p2p_noa_index = -1; 2032 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2033 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2034 2035 /* on the next assoc, re-program HT/VHT parameters */ 2036 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2037 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2038 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2039 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2040 2041 /* reset MU-MIMO ownership and group data */ 2042 memset(sdata->vif.bss_conf.mu_group.membership, 0, 2043 sizeof(sdata->vif.bss_conf.mu_group.membership)); 2044 memset(sdata->vif.bss_conf.mu_group.position, 0, 2045 sizeof(sdata->vif.bss_conf.mu_group.position)); 2046 changed |= BSS_CHANGED_MU_GROUPS; 2047 sdata->vif.mu_mimo_owner = false; 2048 2049 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2050 2051 del_timer_sync(&local->dynamic_ps_timer); 2052 cancel_work_sync(&local->dynamic_ps_enable_work); 2053 2054 /* Disable ARP filtering */ 2055 if (sdata->vif.bss_conf.arp_addr_cnt) 2056 changed |= BSS_CHANGED_ARP_FILTER; 2057 2058 sdata->vif.bss_conf.qos = false; 2059 changed |= BSS_CHANGED_QOS; 2060 2061 /* The BSSID (not really interesting) and HT changed */ 2062 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2063 ieee80211_bss_info_change_notify(sdata, changed); 2064 2065 /* disassociated - set to defaults now */ 2066 ieee80211_set_wmm_default(sdata, false, false); 2067 2068 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2069 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2070 del_timer_sync(&sdata->u.mgd.timer); 2071 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2072 2073 sdata->vif.bss_conf.dtim_period = 0; 2074 sdata->vif.bss_conf.beacon_rate = NULL; 2075 2076 ifmgd->have_beacon = false; 2077 2078 ifmgd->flags = 0; 2079 mutex_lock(&local->mtx); 2080 ieee80211_vif_release_channel(sdata); 2081 2082 sdata->vif.csa_active = false; 2083 ifmgd->csa_waiting_bcn = false; 2084 ifmgd->csa_ignored_same_chan = false; 2085 if (sdata->csa_block_tx) { 2086 ieee80211_wake_vif_queues(local, sdata, 2087 IEEE80211_QUEUE_STOP_REASON_CSA); 2088 sdata->csa_block_tx = false; 2089 } 2090 mutex_unlock(&local->mtx); 2091 2092 /* existing TX TSPEC sessions no longer exist */ 2093 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2094 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2095 2096 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2097 } 2098 2099 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2100 struct ieee80211_hdr *hdr) 2101 { 2102 /* 2103 * We can postpone the mgd.timer whenever receiving unicast frames 2104 * from AP because we know that the connection is working both ways 2105 * at that time. But multicast frames (and hence also beacons) must 2106 * be ignored here, because we need to trigger the timer during 2107 * data idle periods for sending the periodic probe request to the 2108 * AP we're connected to. 2109 */ 2110 if (is_multicast_ether_addr(hdr->addr1)) 2111 return; 2112 2113 ieee80211_sta_reset_conn_monitor(sdata); 2114 } 2115 2116 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2117 { 2118 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2119 struct ieee80211_local *local = sdata->local; 2120 2121 mutex_lock(&local->mtx); 2122 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2123 goto out; 2124 2125 __ieee80211_stop_poll(sdata); 2126 2127 mutex_lock(&local->iflist_mtx); 2128 ieee80211_recalc_ps(local); 2129 mutex_unlock(&local->iflist_mtx); 2130 2131 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2132 goto out; 2133 2134 /* 2135 * We've received a probe response, but are not sure whether 2136 * we have or will be receiving any beacons or data, so let's 2137 * schedule the timers again, just in case. 2138 */ 2139 ieee80211_sta_reset_beacon_monitor(sdata); 2140 2141 mod_timer(&ifmgd->conn_mon_timer, 2142 round_jiffies_up(jiffies + 2143 IEEE80211_CONNECTION_IDLE_TIME)); 2144 out: 2145 mutex_unlock(&local->mtx); 2146 } 2147 2148 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2149 struct ieee80211_hdr *hdr, 2150 u16 tx_time) 2151 { 2152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2153 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2154 int ac = ieee80211_ac_from_tid(tid); 2155 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2156 unsigned long now = jiffies; 2157 2158 if (likely(!tx_tspec->admitted_time)) 2159 return; 2160 2161 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2162 tx_tspec->consumed_tx_time = 0; 2163 tx_tspec->time_slice_start = now; 2164 2165 if (tx_tspec->downgraded) { 2166 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2167 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2168 } 2169 } 2170 2171 if (tx_tspec->downgraded) 2172 return; 2173 2174 tx_tspec->consumed_tx_time += tx_time; 2175 2176 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2177 tx_tspec->downgraded = true; 2178 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2179 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2180 } 2181 } 2182 2183 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2184 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2185 { 2186 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2187 2188 if (!ieee80211_is_data(hdr->frame_control)) 2189 return; 2190 2191 if (ieee80211_is_nullfunc(hdr->frame_control) && 2192 sdata->u.mgd.probe_send_count > 0) { 2193 if (ack) 2194 ieee80211_sta_reset_conn_monitor(sdata); 2195 else 2196 sdata->u.mgd.nullfunc_failed = true; 2197 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2198 return; 2199 } 2200 2201 if (ack) 2202 ieee80211_sta_reset_conn_monitor(sdata); 2203 } 2204 2205 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2206 { 2207 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2208 const u8 *ssid; 2209 u8 *dst = ifmgd->associated->bssid; 2210 u8 unicast_limit = max(1, max_probe_tries - 3); 2211 struct sta_info *sta; 2212 2213 /* 2214 * Try sending broadcast probe requests for the last three 2215 * probe requests after the first ones failed since some 2216 * buggy APs only support broadcast probe requests. 2217 */ 2218 if (ifmgd->probe_send_count >= unicast_limit) 2219 dst = NULL; 2220 2221 /* 2222 * When the hardware reports an accurate Tx ACK status, it's 2223 * better to send a nullfunc frame instead of a probe request, 2224 * as it will kick us off the AP quickly if we aren't associated 2225 * anymore. The timeout will be reset if the frame is ACKed by 2226 * the AP. 2227 */ 2228 ifmgd->probe_send_count++; 2229 2230 if (dst) { 2231 mutex_lock(&sdata->local->sta_mtx); 2232 sta = sta_info_get(sdata, dst); 2233 if (!WARN_ON(!sta)) 2234 ieee80211_check_fast_rx(sta); 2235 mutex_unlock(&sdata->local->sta_mtx); 2236 } 2237 2238 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2239 ifmgd->nullfunc_failed = false; 2240 ieee80211_send_nullfunc(sdata->local, sdata, false); 2241 } else { 2242 int ssid_len; 2243 2244 rcu_read_lock(); 2245 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2246 if (WARN_ON_ONCE(ssid == NULL)) 2247 ssid_len = 0; 2248 else 2249 ssid_len = ssid[1]; 2250 2251 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2252 ssid + 2, ssid_len, NULL, 2253 0, (u32) -1, true, 0, 2254 ifmgd->associated->channel, false); 2255 rcu_read_unlock(); 2256 } 2257 2258 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2259 run_again(sdata, ifmgd->probe_timeout); 2260 } 2261 2262 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2263 bool beacon) 2264 { 2265 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2266 bool already = false; 2267 2268 if (!ieee80211_sdata_running(sdata)) 2269 return; 2270 2271 sdata_lock(sdata); 2272 2273 if (!ifmgd->associated) 2274 goto out; 2275 2276 mutex_lock(&sdata->local->mtx); 2277 2278 if (sdata->local->tmp_channel || sdata->local->scanning) { 2279 mutex_unlock(&sdata->local->mtx); 2280 goto out; 2281 } 2282 2283 if (beacon) { 2284 mlme_dbg_ratelimited(sdata, 2285 "detected beacon loss from AP (missed %d beacons) - probing\n", 2286 beacon_loss_count); 2287 2288 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2289 } 2290 2291 /* 2292 * The driver/our work has already reported this event or the 2293 * connection monitoring has kicked in and we have already sent 2294 * a probe request. Or maybe the AP died and the driver keeps 2295 * reporting until we disassociate... 2296 * 2297 * In either case we have to ignore the current call to this 2298 * function (except for setting the correct probe reason bit) 2299 * because otherwise we would reset the timer every time and 2300 * never check whether we received a probe response! 2301 */ 2302 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2303 already = true; 2304 2305 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2306 2307 mutex_unlock(&sdata->local->mtx); 2308 2309 if (already) 2310 goto out; 2311 2312 mutex_lock(&sdata->local->iflist_mtx); 2313 ieee80211_recalc_ps(sdata->local); 2314 mutex_unlock(&sdata->local->iflist_mtx); 2315 2316 ifmgd->probe_send_count = 0; 2317 ieee80211_mgd_probe_ap_send(sdata); 2318 out: 2319 sdata_unlock(sdata); 2320 } 2321 2322 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2323 struct ieee80211_vif *vif) 2324 { 2325 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2326 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2327 struct cfg80211_bss *cbss; 2328 struct sk_buff *skb; 2329 const u8 *ssid; 2330 int ssid_len; 2331 2332 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2333 return NULL; 2334 2335 sdata_assert_lock(sdata); 2336 2337 if (ifmgd->associated) 2338 cbss = ifmgd->associated; 2339 else if (ifmgd->auth_data) 2340 cbss = ifmgd->auth_data->bss; 2341 else if (ifmgd->assoc_data) 2342 cbss = ifmgd->assoc_data->bss; 2343 else 2344 return NULL; 2345 2346 rcu_read_lock(); 2347 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2348 if (WARN_ON_ONCE(ssid == NULL)) 2349 ssid_len = 0; 2350 else 2351 ssid_len = ssid[1]; 2352 2353 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2354 (u32) -1, cbss->channel, 2355 ssid + 2, ssid_len, 2356 NULL, 0, true); 2357 rcu_read_unlock(); 2358 2359 return skb; 2360 } 2361 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2362 2363 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2364 const u8 *buf, size_t len, bool tx, 2365 u16 reason) 2366 { 2367 struct ieee80211_event event = { 2368 .type = MLME_EVENT, 2369 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2370 .u.mlme.reason = reason, 2371 }; 2372 2373 if (tx) 2374 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2375 else 2376 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2377 2378 drv_event_callback(sdata->local, sdata, &event); 2379 } 2380 2381 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2382 { 2383 struct ieee80211_local *local = sdata->local; 2384 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2385 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2386 2387 sdata_lock(sdata); 2388 if (!ifmgd->associated) { 2389 sdata_unlock(sdata); 2390 return; 2391 } 2392 2393 /* AP is probably out of range (or not reachable for another reason) so 2394 * remove the bss struct for that AP. 2395 */ 2396 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated); 2397 2398 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2399 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2400 true, frame_buf); 2401 mutex_lock(&local->mtx); 2402 sdata->vif.csa_active = false; 2403 ifmgd->csa_waiting_bcn = false; 2404 if (sdata->csa_block_tx) { 2405 ieee80211_wake_vif_queues(local, sdata, 2406 IEEE80211_QUEUE_STOP_REASON_CSA); 2407 sdata->csa_block_tx = false; 2408 } 2409 mutex_unlock(&local->mtx); 2410 2411 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2412 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2413 2414 sdata_unlock(sdata); 2415 } 2416 2417 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2418 { 2419 struct ieee80211_sub_if_data *sdata = 2420 container_of(work, struct ieee80211_sub_if_data, 2421 u.mgd.beacon_connection_loss_work); 2422 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2423 2424 if (ifmgd->associated) 2425 ifmgd->beacon_loss_count++; 2426 2427 if (ifmgd->connection_loss) { 2428 sdata_info(sdata, "Connection to AP %pM lost\n", 2429 ifmgd->bssid); 2430 __ieee80211_disconnect(sdata); 2431 } else { 2432 ieee80211_mgd_probe_ap(sdata, true); 2433 } 2434 } 2435 2436 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2437 { 2438 struct ieee80211_sub_if_data *sdata = 2439 container_of(work, struct ieee80211_sub_if_data, 2440 u.mgd.csa_connection_drop_work); 2441 2442 __ieee80211_disconnect(sdata); 2443 } 2444 2445 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2446 { 2447 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2448 struct ieee80211_hw *hw = &sdata->local->hw; 2449 2450 trace_api_beacon_loss(sdata); 2451 2452 sdata->u.mgd.connection_loss = false; 2453 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2454 } 2455 EXPORT_SYMBOL(ieee80211_beacon_loss); 2456 2457 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2458 { 2459 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2460 struct ieee80211_hw *hw = &sdata->local->hw; 2461 2462 trace_api_connection_loss(sdata); 2463 2464 sdata->u.mgd.connection_loss = true; 2465 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2466 } 2467 EXPORT_SYMBOL(ieee80211_connection_loss); 2468 2469 2470 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2471 bool assoc) 2472 { 2473 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2474 2475 sdata_assert_lock(sdata); 2476 2477 if (!assoc) { 2478 /* 2479 * we are not authenticated yet, the only timer that could be 2480 * running is the timeout for the authentication response which 2481 * which is not relevant anymore. 2482 */ 2483 del_timer_sync(&sdata->u.mgd.timer); 2484 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2485 2486 eth_zero_addr(sdata->u.mgd.bssid); 2487 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2488 sdata->u.mgd.flags = 0; 2489 mutex_lock(&sdata->local->mtx); 2490 ieee80211_vif_release_channel(sdata); 2491 mutex_unlock(&sdata->local->mtx); 2492 } 2493 2494 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2495 kfree(auth_data); 2496 sdata->u.mgd.auth_data = NULL; 2497 } 2498 2499 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2500 bool assoc, bool abandon) 2501 { 2502 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2503 2504 sdata_assert_lock(sdata); 2505 2506 if (!assoc) { 2507 /* 2508 * we are not associated yet, the only timer that could be 2509 * running is the timeout for the association response which 2510 * which is not relevant anymore. 2511 */ 2512 del_timer_sync(&sdata->u.mgd.timer); 2513 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2514 2515 eth_zero_addr(sdata->u.mgd.bssid); 2516 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2517 sdata->u.mgd.flags = 0; 2518 sdata->vif.mu_mimo_owner = false; 2519 2520 mutex_lock(&sdata->local->mtx); 2521 ieee80211_vif_release_channel(sdata); 2522 mutex_unlock(&sdata->local->mtx); 2523 2524 if (abandon) 2525 cfg80211_abandon_assoc(sdata->dev, assoc_data->bss); 2526 } 2527 2528 kfree(assoc_data); 2529 sdata->u.mgd.assoc_data = NULL; 2530 } 2531 2532 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2533 struct ieee80211_mgmt *mgmt, size_t len) 2534 { 2535 struct ieee80211_local *local = sdata->local; 2536 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2537 u8 *pos; 2538 struct ieee802_11_elems elems; 2539 u32 tx_flags = 0; 2540 2541 pos = mgmt->u.auth.variable; 2542 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2543 if (!elems.challenge) 2544 return; 2545 auth_data->expected_transaction = 4; 2546 drv_mgd_prepare_tx(sdata->local, sdata); 2547 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2548 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2549 IEEE80211_TX_INTFL_MLME_CONN_TX; 2550 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2551 elems.challenge - 2, elems.challenge_len + 2, 2552 auth_data->bss->bssid, auth_data->bss->bssid, 2553 auth_data->key, auth_data->key_len, 2554 auth_data->key_idx, tx_flags); 2555 } 2556 2557 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2558 struct ieee80211_mgmt *mgmt, size_t len) 2559 { 2560 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2561 u8 bssid[ETH_ALEN]; 2562 u16 auth_alg, auth_transaction, status_code; 2563 struct sta_info *sta; 2564 struct ieee80211_event event = { 2565 .type = MLME_EVENT, 2566 .u.mlme.data = AUTH_EVENT, 2567 }; 2568 2569 sdata_assert_lock(sdata); 2570 2571 if (len < 24 + 6) 2572 return; 2573 2574 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2575 return; 2576 2577 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2578 2579 if (!ether_addr_equal(bssid, mgmt->bssid)) 2580 return; 2581 2582 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2583 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2584 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2585 2586 if (auth_alg != ifmgd->auth_data->algorithm || 2587 auth_transaction != ifmgd->auth_data->expected_transaction) { 2588 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2589 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2590 auth_transaction, 2591 ifmgd->auth_data->expected_transaction); 2592 return; 2593 } 2594 2595 if (status_code != WLAN_STATUS_SUCCESS) { 2596 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2597 mgmt->sa, status_code); 2598 ieee80211_destroy_auth_data(sdata, false); 2599 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2600 event.u.mlme.status = MLME_DENIED; 2601 event.u.mlme.reason = status_code; 2602 drv_event_callback(sdata->local, sdata, &event); 2603 return; 2604 } 2605 2606 switch (ifmgd->auth_data->algorithm) { 2607 case WLAN_AUTH_OPEN: 2608 case WLAN_AUTH_LEAP: 2609 case WLAN_AUTH_FT: 2610 case WLAN_AUTH_SAE: 2611 case WLAN_AUTH_FILS_SK: 2612 case WLAN_AUTH_FILS_SK_PFS: 2613 case WLAN_AUTH_FILS_PK: 2614 break; 2615 case WLAN_AUTH_SHARED_KEY: 2616 if (ifmgd->auth_data->expected_transaction != 4) { 2617 ieee80211_auth_challenge(sdata, mgmt, len); 2618 /* need another frame */ 2619 return; 2620 } 2621 break; 2622 default: 2623 WARN_ONCE(1, "invalid auth alg %d", 2624 ifmgd->auth_data->algorithm); 2625 return; 2626 } 2627 2628 event.u.mlme.status = MLME_SUCCESS; 2629 drv_event_callback(sdata->local, sdata, &event); 2630 sdata_info(sdata, "authenticated\n"); 2631 ifmgd->auth_data->done = true; 2632 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2633 ifmgd->auth_data->timeout_started = true; 2634 run_again(sdata, ifmgd->auth_data->timeout); 2635 2636 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2637 ifmgd->auth_data->expected_transaction != 2) { 2638 /* 2639 * Report auth frame to user space for processing since another 2640 * round of Authentication frames is still needed. 2641 */ 2642 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2643 return; 2644 } 2645 2646 /* move station state to auth */ 2647 mutex_lock(&sdata->local->sta_mtx); 2648 sta = sta_info_get(sdata, bssid); 2649 if (!sta) { 2650 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2651 goto out_err; 2652 } 2653 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2654 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2655 goto out_err; 2656 } 2657 mutex_unlock(&sdata->local->sta_mtx); 2658 2659 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2660 return; 2661 out_err: 2662 mutex_unlock(&sdata->local->sta_mtx); 2663 /* ignore frame -- wait for timeout */ 2664 } 2665 2666 #define case_WLAN(type) \ 2667 case WLAN_REASON_##type: return #type 2668 2669 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2670 { 2671 switch (reason_code) { 2672 case_WLAN(UNSPECIFIED); 2673 case_WLAN(PREV_AUTH_NOT_VALID); 2674 case_WLAN(DEAUTH_LEAVING); 2675 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2676 case_WLAN(DISASSOC_AP_BUSY); 2677 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2678 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2679 case_WLAN(DISASSOC_STA_HAS_LEFT); 2680 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2681 case_WLAN(DISASSOC_BAD_POWER); 2682 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2683 case_WLAN(INVALID_IE); 2684 case_WLAN(MIC_FAILURE); 2685 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2686 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2687 case_WLAN(IE_DIFFERENT); 2688 case_WLAN(INVALID_GROUP_CIPHER); 2689 case_WLAN(INVALID_PAIRWISE_CIPHER); 2690 case_WLAN(INVALID_AKMP); 2691 case_WLAN(UNSUPP_RSN_VERSION); 2692 case_WLAN(INVALID_RSN_IE_CAP); 2693 case_WLAN(IEEE8021X_FAILED); 2694 case_WLAN(CIPHER_SUITE_REJECTED); 2695 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2696 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2697 case_WLAN(DISASSOC_LOW_ACK); 2698 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2699 case_WLAN(QSTA_LEAVE_QBSS); 2700 case_WLAN(QSTA_NOT_USE); 2701 case_WLAN(QSTA_REQUIRE_SETUP); 2702 case_WLAN(QSTA_TIMEOUT); 2703 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2704 case_WLAN(MESH_PEER_CANCELED); 2705 case_WLAN(MESH_MAX_PEERS); 2706 case_WLAN(MESH_CONFIG); 2707 case_WLAN(MESH_CLOSE); 2708 case_WLAN(MESH_MAX_RETRIES); 2709 case_WLAN(MESH_CONFIRM_TIMEOUT); 2710 case_WLAN(MESH_INVALID_GTK); 2711 case_WLAN(MESH_INCONSISTENT_PARAM); 2712 case_WLAN(MESH_INVALID_SECURITY); 2713 case_WLAN(MESH_PATH_ERROR); 2714 case_WLAN(MESH_PATH_NOFORWARD); 2715 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2716 case_WLAN(MAC_EXISTS_IN_MBSS); 2717 case_WLAN(MESH_CHAN_REGULATORY); 2718 case_WLAN(MESH_CHAN); 2719 default: return "<unknown>"; 2720 } 2721 } 2722 2723 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2724 struct ieee80211_mgmt *mgmt, size_t len) 2725 { 2726 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2727 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2728 2729 sdata_assert_lock(sdata); 2730 2731 if (len < 24 + 2) 2732 return; 2733 2734 if (ifmgd->associated && 2735 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2736 const u8 *bssid = ifmgd->associated->bssid; 2737 2738 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2739 bssid, reason_code, 2740 ieee80211_get_reason_code_string(reason_code)); 2741 2742 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2743 2744 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2745 reason_code); 2746 return; 2747 } 2748 2749 if (ifmgd->assoc_data && 2750 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2751 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2752 2753 sdata_info(sdata, 2754 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2755 bssid, reason_code, 2756 ieee80211_get_reason_code_string(reason_code)); 2757 2758 ieee80211_destroy_assoc_data(sdata, false, true); 2759 2760 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2761 return; 2762 } 2763 } 2764 2765 2766 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2767 struct ieee80211_mgmt *mgmt, size_t len) 2768 { 2769 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2770 u16 reason_code; 2771 2772 sdata_assert_lock(sdata); 2773 2774 if (len < 24 + 2) 2775 return; 2776 2777 if (!ifmgd->associated || 2778 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2779 return; 2780 2781 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2782 2783 sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n", 2784 mgmt->sa, reason_code, 2785 ieee80211_get_reason_code_string(reason_code)); 2786 2787 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2788 2789 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2790 } 2791 2792 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2793 u8 *supp_rates, unsigned int supp_rates_len, 2794 u32 *rates, u32 *basic_rates, 2795 bool *have_higher_than_11mbit, 2796 int *min_rate, int *min_rate_index, 2797 int shift) 2798 { 2799 int i, j; 2800 2801 for (i = 0; i < supp_rates_len; i++) { 2802 int rate = supp_rates[i] & 0x7f; 2803 bool is_basic = !!(supp_rates[i] & 0x80); 2804 2805 if ((rate * 5 * (1 << shift)) > 110) 2806 *have_higher_than_11mbit = true; 2807 2808 /* 2809 * Skip HT and VHT BSS membership selectors since they're not 2810 * rates. 2811 * 2812 * Note: Even though the membership selector and the basic 2813 * rate flag share the same bit, they are not exactly 2814 * the same. 2815 */ 2816 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) || 2817 supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY)) 2818 continue; 2819 2820 for (j = 0; j < sband->n_bitrates; j++) { 2821 struct ieee80211_rate *br; 2822 int brate; 2823 2824 br = &sband->bitrates[j]; 2825 2826 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2827 if (brate == rate) { 2828 *rates |= BIT(j); 2829 if (is_basic) 2830 *basic_rates |= BIT(j); 2831 if ((rate * 5) < *min_rate) { 2832 *min_rate = rate * 5; 2833 *min_rate_index = j; 2834 } 2835 break; 2836 } 2837 } 2838 } 2839 } 2840 2841 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2842 struct cfg80211_bss *cbss, 2843 struct ieee80211_mgmt *mgmt, size_t len) 2844 { 2845 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2846 struct ieee80211_local *local = sdata->local; 2847 struct ieee80211_supported_band *sband; 2848 struct sta_info *sta; 2849 u8 *pos; 2850 u16 capab_info, aid; 2851 struct ieee802_11_elems elems; 2852 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2853 const struct cfg80211_bss_ies *bss_ies = NULL; 2854 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2855 u32 changed = 0; 2856 int err; 2857 bool ret; 2858 2859 /* AssocResp and ReassocResp have identical structure */ 2860 2861 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2862 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2863 2864 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2865 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2866 aid); 2867 aid &= ~(BIT(15) | BIT(14)); 2868 2869 ifmgd->broken_ap = false; 2870 2871 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2872 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2873 aid); 2874 aid = 0; 2875 ifmgd->broken_ap = true; 2876 } 2877 2878 pos = mgmt->u.assoc_resp.variable; 2879 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2880 2881 if (!elems.supp_rates) { 2882 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2883 return false; 2884 } 2885 2886 ifmgd->aid = aid; 2887 ifmgd->tdls_chan_switch_prohibited = 2888 elems.ext_capab && elems.ext_capab_len >= 5 && 2889 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2890 2891 /* 2892 * Some APs are erroneously not including some information in their 2893 * (re)association response frames. Try to recover by using the data 2894 * from the beacon or probe response. This seems to afflict mobile 2895 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2896 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2897 */ 2898 if ((assoc_data->wmm && !elems.wmm_param) || 2899 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2900 (!elems.ht_cap_elem || !elems.ht_operation)) || 2901 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2902 (!elems.vht_cap_elem || !elems.vht_operation))) { 2903 const struct cfg80211_bss_ies *ies; 2904 struct ieee802_11_elems bss_elems; 2905 2906 rcu_read_lock(); 2907 ies = rcu_dereference(cbss->ies); 2908 if (ies) 2909 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2910 GFP_ATOMIC); 2911 rcu_read_unlock(); 2912 if (!bss_ies) 2913 return false; 2914 2915 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2916 false, &bss_elems); 2917 if (assoc_data->wmm && 2918 !elems.wmm_param && bss_elems.wmm_param) { 2919 elems.wmm_param = bss_elems.wmm_param; 2920 sdata_info(sdata, 2921 "AP bug: WMM param missing from AssocResp\n"); 2922 } 2923 2924 /* 2925 * Also check if we requested HT/VHT, otherwise the AP doesn't 2926 * have to include the IEs in the (re)association response. 2927 */ 2928 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2929 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2930 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2931 sdata_info(sdata, 2932 "AP bug: HT capability missing from AssocResp\n"); 2933 } 2934 if (!elems.ht_operation && bss_elems.ht_operation && 2935 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2936 elems.ht_operation = bss_elems.ht_operation; 2937 sdata_info(sdata, 2938 "AP bug: HT operation missing from AssocResp\n"); 2939 } 2940 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2941 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2942 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2943 sdata_info(sdata, 2944 "AP bug: VHT capa missing from AssocResp\n"); 2945 } 2946 if (!elems.vht_operation && bss_elems.vht_operation && 2947 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2948 elems.vht_operation = bss_elems.vht_operation; 2949 sdata_info(sdata, 2950 "AP bug: VHT operation missing from AssocResp\n"); 2951 } 2952 } 2953 2954 /* 2955 * We previously checked these in the beacon/probe response, so 2956 * they should be present here. This is just a safety net. 2957 */ 2958 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2959 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2960 sdata_info(sdata, 2961 "HT AP is missing WMM params or HT capability/operation\n"); 2962 ret = false; 2963 goto out; 2964 } 2965 2966 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2967 (!elems.vht_cap_elem || !elems.vht_operation)) { 2968 sdata_info(sdata, 2969 "VHT AP is missing VHT capability/operation\n"); 2970 ret = false; 2971 goto out; 2972 } 2973 2974 mutex_lock(&sdata->local->sta_mtx); 2975 /* 2976 * station info was already allocated and inserted before 2977 * the association and should be available to us 2978 */ 2979 sta = sta_info_get(sdata, cbss->bssid); 2980 if (WARN_ON(!sta)) { 2981 mutex_unlock(&sdata->local->sta_mtx); 2982 ret = false; 2983 goto out; 2984 } 2985 2986 sband = ieee80211_get_sband(sdata); 2987 if (!sband) { 2988 mutex_unlock(&sdata->local->sta_mtx); 2989 ret = false; 2990 goto out; 2991 } 2992 2993 /* Set up internal HT/VHT capabilities */ 2994 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2995 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2996 elems.ht_cap_elem, sta); 2997 2998 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 2999 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 3000 elems.vht_cap_elem, sta); 3001 3002 /* 3003 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3004 * in their association response, so ignore that data for our own 3005 * configuration. If it changed since the last beacon, we'll get the 3006 * next beacon and update then. 3007 */ 3008 3009 /* 3010 * If an operating mode notification IE is present, override the 3011 * NSS calculation (that would be done in rate_control_rate_init()) 3012 * and use the # of streams from that element. 3013 */ 3014 if (elems.opmode_notif && 3015 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3016 u8 nss; 3017 3018 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3019 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3020 nss += 1; 3021 sta->sta.rx_nss = nss; 3022 } 3023 3024 rate_control_rate_init(sta); 3025 3026 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3027 set_sta_flag(sta, WLAN_STA_MFP); 3028 sta->sta.mfp = true; 3029 } else { 3030 sta->sta.mfp = false; 3031 } 3032 3033 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3034 3035 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3036 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3037 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3038 if (err) { 3039 sdata_info(sdata, 3040 "failed to move station %pM to desired state\n", 3041 sta->sta.addr); 3042 WARN_ON(__sta_info_destroy(sta)); 3043 mutex_unlock(&sdata->local->sta_mtx); 3044 ret = false; 3045 goto out; 3046 } 3047 3048 mutex_unlock(&sdata->local->sta_mtx); 3049 3050 /* 3051 * Always handle WMM once after association regardless 3052 * of the first value the AP uses. Setting -1 here has 3053 * that effect because the AP values is an unsigned 3054 * 4-bit value. 3055 */ 3056 ifmgd->wmm_last_param_set = -1; 3057 3058 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3059 ieee80211_set_wmm_default(sdata, false, false); 3060 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3061 elems.wmm_param_len)) { 3062 /* still enable QoS since we might have HT/VHT */ 3063 ieee80211_set_wmm_default(sdata, false, true); 3064 /* set the disable-WMM flag in this case to disable 3065 * tracking WMM parameter changes in the beacon if 3066 * the parameters weren't actually valid. Doing so 3067 * avoids changing parameters very strangely when 3068 * the AP is going back and forth between valid and 3069 * invalid parameters. 3070 */ 3071 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3072 } 3073 changed |= BSS_CHANGED_QOS; 3074 3075 if (elems.max_idle_period_ie) { 3076 bss_conf->max_idle_period = 3077 le16_to_cpu(elems.max_idle_period_ie->max_idle_period); 3078 bss_conf->protected_keep_alive = 3079 !!(elems.max_idle_period_ie->idle_options & 3080 WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE); 3081 changed |= BSS_CHANGED_KEEP_ALIVE; 3082 } else { 3083 bss_conf->max_idle_period = 0; 3084 bss_conf->protected_keep_alive = false; 3085 } 3086 3087 /* set AID and assoc capability, 3088 * ieee80211_set_associated() will tell the driver */ 3089 bss_conf->aid = aid; 3090 bss_conf->assoc_capability = capab_info; 3091 ieee80211_set_associated(sdata, cbss, changed); 3092 3093 /* 3094 * If we're using 4-addr mode, let the AP know that we're 3095 * doing so, so that it can create the STA VLAN on its side 3096 */ 3097 if (ifmgd->use_4addr) 3098 ieee80211_send_4addr_nullfunc(local, sdata); 3099 3100 /* 3101 * Start timer to probe the connection to the AP now. 3102 * Also start the timer that will detect beacon loss. 3103 */ 3104 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3105 ieee80211_sta_reset_beacon_monitor(sdata); 3106 3107 ret = true; 3108 out: 3109 kfree(bss_ies); 3110 return ret; 3111 } 3112 3113 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3114 struct ieee80211_mgmt *mgmt, 3115 size_t len) 3116 { 3117 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3118 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3119 u16 capab_info, status_code, aid; 3120 struct ieee802_11_elems elems; 3121 int ac, uapsd_queues = -1; 3122 u8 *pos; 3123 bool reassoc; 3124 struct cfg80211_bss *bss; 3125 struct ieee80211_event event = { 3126 .type = MLME_EVENT, 3127 .u.mlme.data = ASSOC_EVENT, 3128 }; 3129 3130 sdata_assert_lock(sdata); 3131 3132 if (!assoc_data) 3133 return; 3134 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3135 return; 3136 3137 /* 3138 * AssocResp and ReassocResp have identical structure, so process both 3139 * of them in this function. 3140 */ 3141 3142 if (len < 24 + 6) 3143 return; 3144 3145 reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control); 3146 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3147 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3148 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3149 3150 sdata_info(sdata, 3151 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3152 reassoc ? "Rea" : "A", mgmt->sa, 3153 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3154 3155 if (assoc_data->fils_kek_len && 3156 fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0) 3157 return; 3158 3159 pos = mgmt->u.assoc_resp.variable; 3160 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3161 3162 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3163 elems.timeout_int && 3164 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3165 u32 tu, ms; 3166 tu = le32_to_cpu(elems.timeout_int->value); 3167 ms = tu * 1024 / 1000; 3168 sdata_info(sdata, 3169 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3170 mgmt->sa, tu, ms); 3171 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3172 assoc_data->timeout_started = true; 3173 if (ms > IEEE80211_ASSOC_TIMEOUT) 3174 run_again(sdata, assoc_data->timeout); 3175 return; 3176 } 3177 3178 bss = assoc_data->bss; 3179 3180 if (status_code != WLAN_STATUS_SUCCESS) { 3181 sdata_info(sdata, "%pM denied association (code=%d)\n", 3182 mgmt->sa, status_code); 3183 ieee80211_destroy_assoc_data(sdata, false, false); 3184 event.u.mlme.status = MLME_DENIED; 3185 event.u.mlme.reason = status_code; 3186 drv_event_callback(sdata->local, sdata, &event); 3187 } else { 3188 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3189 /* oops -- internal error -- send timeout for now */ 3190 ieee80211_destroy_assoc_data(sdata, false, false); 3191 cfg80211_assoc_timeout(sdata->dev, bss); 3192 return; 3193 } 3194 event.u.mlme.status = MLME_SUCCESS; 3195 drv_event_callback(sdata->local, sdata, &event); 3196 sdata_info(sdata, "associated\n"); 3197 3198 /* 3199 * destroy assoc_data afterwards, as otherwise an idle 3200 * recalc after assoc_data is NULL but before associated 3201 * is set can cause the interface to go idle 3202 */ 3203 ieee80211_destroy_assoc_data(sdata, true, false); 3204 3205 /* get uapsd queues configuration */ 3206 uapsd_queues = 0; 3207 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3208 if (sdata->tx_conf[ac].uapsd) 3209 uapsd_queues |= ieee80211_ac_to_qos_mask[ac]; 3210 } 3211 3212 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3213 } 3214 3215 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3216 struct ieee80211_mgmt *mgmt, size_t len, 3217 struct ieee80211_rx_status *rx_status, 3218 struct ieee802_11_elems *elems) 3219 { 3220 struct ieee80211_local *local = sdata->local; 3221 struct ieee80211_bss *bss; 3222 struct ieee80211_channel *channel; 3223 3224 sdata_assert_lock(sdata); 3225 3226 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3227 if (!channel) 3228 return; 3229 3230 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3231 channel); 3232 if (bss) { 3233 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3234 ieee80211_rx_bss_put(local, bss); 3235 } 3236 } 3237 3238 3239 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3240 struct sk_buff *skb) 3241 { 3242 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3243 struct ieee80211_if_managed *ifmgd; 3244 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3245 size_t baselen, len = skb->len; 3246 struct ieee802_11_elems elems; 3247 3248 ifmgd = &sdata->u.mgd; 3249 3250 sdata_assert_lock(sdata); 3251 3252 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3253 return; /* ignore ProbeResp to foreign address */ 3254 3255 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3256 if (baselen > len) 3257 return; 3258 3259 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3260 false, &elems); 3261 3262 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3263 3264 if (ifmgd->associated && 3265 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3266 ieee80211_reset_ap_probe(sdata); 3267 } 3268 3269 /* 3270 * This is the canonical list of information elements we care about, 3271 * the filter code also gives us all changes to the Microsoft OUI 3272 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3273 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3274 * changes to requested client power. 3275 * 3276 * We implement beacon filtering in software since that means we can 3277 * avoid processing the frame here and in cfg80211, and userspace 3278 * will not be able to tell whether the hardware supports it or not. 3279 * 3280 * XXX: This list needs to be dynamic -- userspace needs to be able to 3281 * add items it requires. It also needs to be able to tell us to 3282 * look out for other vendor IEs. 3283 */ 3284 static const u64 care_about_ies = 3285 (1ULL << WLAN_EID_COUNTRY) | 3286 (1ULL << WLAN_EID_ERP_INFO) | 3287 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3288 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3289 (1ULL << WLAN_EID_HT_CAPABILITY) | 3290 (1ULL << WLAN_EID_HT_OPERATION) | 3291 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3292 3293 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3294 struct ieee80211_mgmt *mgmt, size_t len, 3295 struct ieee80211_rx_status *rx_status) 3296 { 3297 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3298 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3299 size_t baselen; 3300 struct ieee802_11_elems elems; 3301 struct ieee80211_local *local = sdata->local; 3302 struct ieee80211_chanctx_conf *chanctx_conf; 3303 struct ieee80211_channel *chan; 3304 struct sta_info *sta; 3305 u32 changed = 0; 3306 bool erp_valid; 3307 u8 erp_value = 0; 3308 u32 ncrc; 3309 u8 *bssid; 3310 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3311 3312 sdata_assert_lock(sdata); 3313 3314 /* Process beacon from the current BSS */ 3315 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3316 if (baselen > len) 3317 return; 3318 3319 rcu_read_lock(); 3320 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3321 if (!chanctx_conf) { 3322 rcu_read_unlock(); 3323 return; 3324 } 3325 3326 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3327 rcu_read_unlock(); 3328 return; 3329 } 3330 chan = chanctx_conf->def.chan; 3331 rcu_read_unlock(); 3332 3333 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3334 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3335 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3336 len - baselen, false, &elems); 3337 3338 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3339 if (elems.tim && !elems.parse_error) { 3340 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3341 ifmgd->dtim_period = tim_ie->dtim_period; 3342 } 3343 ifmgd->have_beacon = true; 3344 ifmgd->assoc_data->need_beacon = false; 3345 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3346 sdata->vif.bss_conf.sync_tsf = 3347 le64_to_cpu(mgmt->u.beacon.timestamp); 3348 sdata->vif.bss_conf.sync_device_ts = 3349 rx_status->device_timestamp; 3350 if (elems.tim) 3351 sdata->vif.bss_conf.sync_dtim_count = 3352 elems.tim->dtim_count; 3353 else 3354 sdata->vif.bss_conf.sync_dtim_count = 0; 3355 } 3356 /* continue assoc process */ 3357 ifmgd->assoc_data->timeout = jiffies; 3358 ifmgd->assoc_data->timeout_started = true; 3359 run_again(sdata, ifmgd->assoc_data->timeout); 3360 return; 3361 } 3362 3363 if (!ifmgd->associated || 3364 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3365 return; 3366 bssid = ifmgd->associated->bssid; 3367 3368 /* Track average RSSI from the Beacon frames of the current AP */ 3369 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3370 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3371 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3372 ifmgd->last_cqm_event_signal = 0; 3373 ifmgd->count_beacon_signal = 1; 3374 ifmgd->last_ave_beacon_signal = 0; 3375 } else { 3376 ifmgd->count_beacon_signal++; 3377 } 3378 3379 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3380 3381 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3382 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3383 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3384 int last_sig = ifmgd->last_ave_beacon_signal; 3385 struct ieee80211_event event = { 3386 .type = RSSI_EVENT, 3387 }; 3388 3389 /* 3390 * if signal crosses either of the boundaries, invoke callback 3391 * with appropriate parameters 3392 */ 3393 if (sig > ifmgd->rssi_max_thold && 3394 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3395 ifmgd->last_ave_beacon_signal = sig; 3396 event.u.rssi.data = RSSI_EVENT_HIGH; 3397 drv_event_callback(local, sdata, &event); 3398 } else if (sig < ifmgd->rssi_min_thold && 3399 (last_sig >= ifmgd->rssi_max_thold || 3400 last_sig == 0)) { 3401 ifmgd->last_ave_beacon_signal = sig; 3402 event.u.rssi.data = RSSI_EVENT_LOW; 3403 drv_event_callback(local, sdata, &event); 3404 } 3405 } 3406 3407 if (bss_conf->cqm_rssi_thold && 3408 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3409 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3410 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3411 int last_event = ifmgd->last_cqm_event_signal; 3412 int thold = bss_conf->cqm_rssi_thold; 3413 int hyst = bss_conf->cqm_rssi_hyst; 3414 3415 if (sig < thold && 3416 (last_event == 0 || sig < last_event - hyst)) { 3417 ifmgd->last_cqm_event_signal = sig; 3418 ieee80211_cqm_rssi_notify( 3419 &sdata->vif, 3420 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3421 sig, GFP_KERNEL); 3422 } else if (sig > thold && 3423 (last_event == 0 || sig > last_event + hyst)) { 3424 ifmgd->last_cqm_event_signal = sig; 3425 ieee80211_cqm_rssi_notify( 3426 &sdata->vif, 3427 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3428 sig, GFP_KERNEL); 3429 } 3430 } 3431 3432 if (bss_conf->cqm_rssi_low && 3433 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3434 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3435 int last_event = ifmgd->last_cqm_event_signal; 3436 int low = bss_conf->cqm_rssi_low; 3437 int high = bss_conf->cqm_rssi_high; 3438 3439 if (sig < low && 3440 (last_event == 0 || last_event >= low)) { 3441 ifmgd->last_cqm_event_signal = sig; 3442 ieee80211_cqm_rssi_notify( 3443 &sdata->vif, 3444 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3445 sig, GFP_KERNEL); 3446 } else if (sig > high && 3447 (last_event == 0 || last_event <= high)) { 3448 ifmgd->last_cqm_event_signal = sig; 3449 ieee80211_cqm_rssi_notify( 3450 &sdata->vif, 3451 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3452 sig, GFP_KERNEL); 3453 } 3454 } 3455 3456 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3457 mlme_dbg_ratelimited(sdata, 3458 "cancelling AP probe due to a received beacon\n"); 3459 ieee80211_reset_ap_probe(sdata); 3460 } 3461 3462 /* 3463 * Push the beacon loss detection into the future since 3464 * we are processing a beacon from the AP just now. 3465 */ 3466 ieee80211_sta_reset_beacon_monitor(sdata); 3467 3468 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3469 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3470 len - baselen, false, &elems, 3471 care_about_ies, ncrc); 3472 3473 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3474 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3475 if (local->hw.conf.dynamic_ps_timeout > 0) { 3476 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3477 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3478 ieee80211_hw_config(local, 3479 IEEE80211_CONF_CHANGE_PS); 3480 } 3481 ieee80211_send_nullfunc(local, sdata, false); 3482 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3483 local->pspolling = true; 3484 3485 /* 3486 * Here is assumed that the driver will be 3487 * able to send ps-poll frame and receive a 3488 * response even though power save mode is 3489 * enabled, but some drivers might require 3490 * to disable power save here. This needs 3491 * to be investigated. 3492 */ 3493 ieee80211_send_pspoll(local, sdata); 3494 } 3495 } 3496 3497 if (sdata->vif.p2p || 3498 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3499 struct ieee80211_p2p_noa_attr noa = {}; 3500 int ret; 3501 3502 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3503 len - baselen, 3504 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3505 (u8 *) &noa, sizeof(noa)); 3506 if (ret >= 2) { 3507 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3508 /* valid noa_attr and index changed */ 3509 sdata->u.mgd.p2p_noa_index = noa.index; 3510 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3511 changed |= BSS_CHANGED_P2P_PS; 3512 /* 3513 * make sure we update all information, the CRC 3514 * mechanism doesn't look at P2P attributes. 3515 */ 3516 ifmgd->beacon_crc_valid = false; 3517 } 3518 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3519 /* noa_attr not found and we had valid noa_attr before */ 3520 sdata->u.mgd.p2p_noa_index = -1; 3521 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3522 changed |= BSS_CHANGED_P2P_PS; 3523 ifmgd->beacon_crc_valid = false; 3524 } 3525 } 3526 3527 if (ifmgd->csa_waiting_bcn) 3528 ieee80211_chswitch_post_beacon(sdata); 3529 3530 /* 3531 * Update beacon timing and dtim count on every beacon appearance. This 3532 * will allow the driver to use the most updated values. Do it before 3533 * comparing this one with last received beacon. 3534 * IMPORTANT: These parameters would possibly be out of sync by the time 3535 * the driver will use them. The synchronized view is currently 3536 * guaranteed only in certain callbacks. 3537 */ 3538 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3539 sdata->vif.bss_conf.sync_tsf = 3540 le64_to_cpu(mgmt->u.beacon.timestamp); 3541 sdata->vif.bss_conf.sync_device_ts = 3542 rx_status->device_timestamp; 3543 if (elems.tim) 3544 sdata->vif.bss_conf.sync_dtim_count = 3545 elems.tim->dtim_count; 3546 else 3547 sdata->vif.bss_conf.sync_dtim_count = 0; 3548 } 3549 3550 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3551 return; 3552 ifmgd->beacon_crc = ncrc; 3553 ifmgd->beacon_crc_valid = true; 3554 3555 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3556 3557 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3558 rx_status->device_timestamp, 3559 &elems, true); 3560 3561 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3562 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3563 elems.wmm_param_len)) 3564 changed |= BSS_CHANGED_QOS; 3565 3566 /* 3567 * If we haven't had a beacon before, tell the driver about the 3568 * DTIM period (and beacon timing if desired) now. 3569 */ 3570 if (!ifmgd->have_beacon) { 3571 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3572 if (elems.tim) 3573 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3574 else 3575 bss_conf->dtim_period = 1; 3576 3577 changed |= BSS_CHANGED_BEACON_INFO; 3578 ifmgd->have_beacon = true; 3579 3580 mutex_lock(&local->iflist_mtx); 3581 ieee80211_recalc_ps(local); 3582 mutex_unlock(&local->iflist_mtx); 3583 3584 ieee80211_recalc_ps_vif(sdata); 3585 } 3586 3587 if (elems.erp_info) { 3588 erp_valid = true; 3589 erp_value = elems.erp_info[0]; 3590 } else { 3591 erp_valid = false; 3592 } 3593 changed |= ieee80211_handle_bss_capability(sdata, 3594 le16_to_cpu(mgmt->u.beacon.capab_info), 3595 erp_valid, erp_value); 3596 3597 mutex_lock(&local->sta_mtx); 3598 sta = sta_info_get(sdata, bssid); 3599 3600 if (ieee80211_config_bw(sdata, sta, 3601 elems.ht_cap_elem, elems.ht_operation, 3602 elems.vht_operation, bssid, &changed)) { 3603 mutex_unlock(&local->sta_mtx); 3604 sdata_info(sdata, 3605 "failed to follow AP %pM bandwidth change, disconnect\n", 3606 bssid); 3607 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3608 WLAN_REASON_DEAUTH_LEAVING, 3609 true, deauth_buf); 3610 ieee80211_report_disconnect(sdata, deauth_buf, 3611 sizeof(deauth_buf), true, 3612 WLAN_REASON_DEAUTH_LEAVING); 3613 return; 3614 } 3615 3616 if (sta && elems.opmode_notif) 3617 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3618 rx_status->band); 3619 mutex_unlock(&local->sta_mtx); 3620 3621 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3622 elems.country_elem, 3623 elems.country_elem_len, 3624 elems.pwr_constr_elem, 3625 elems.cisco_dtpc_elem); 3626 3627 ieee80211_bss_info_change_notify(sdata, changed); 3628 } 3629 3630 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3631 struct sk_buff *skb) 3632 { 3633 struct ieee80211_rx_status *rx_status; 3634 struct ieee80211_mgmt *mgmt; 3635 u16 fc; 3636 struct ieee802_11_elems elems; 3637 int ies_len; 3638 3639 rx_status = (struct ieee80211_rx_status *) skb->cb; 3640 mgmt = (struct ieee80211_mgmt *) skb->data; 3641 fc = le16_to_cpu(mgmt->frame_control); 3642 3643 sdata_lock(sdata); 3644 3645 switch (fc & IEEE80211_FCTL_STYPE) { 3646 case IEEE80211_STYPE_BEACON: 3647 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3648 break; 3649 case IEEE80211_STYPE_PROBE_RESP: 3650 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3651 break; 3652 case IEEE80211_STYPE_AUTH: 3653 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3654 break; 3655 case IEEE80211_STYPE_DEAUTH: 3656 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3657 break; 3658 case IEEE80211_STYPE_DISASSOC: 3659 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3660 break; 3661 case IEEE80211_STYPE_ASSOC_RESP: 3662 case IEEE80211_STYPE_REASSOC_RESP: 3663 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3664 break; 3665 case IEEE80211_STYPE_ACTION: 3666 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3667 ies_len = skb->len - 3668 offsetof(struct ieee80211_mgmt, 3669 u.action.u.chan_switch.variable); 3670 3671 if (ies_len < 0) 3672 break; 3673 3674 ieee802_11_parse_elems( 3675 mgmt->u.action.u.chan_switch.variable, 3676 ies_len, true, &elems); 3677 3678 if (elems.parse_error) 3679 break; 3680 3681 ieee80211_sta_process_chanswitch(sdata, 3682 rx_status->mactime, 3683 rx_status->device_timestamp, 3684 &elems, false); 3685 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3686 ies_len = skb->len - 3687 offsetof(struct ieee80211_mgmt, 3688 u.action.u.ext_chan_switch.variable); 3689 3690 if (ies_len < 0) 3691 break; 3692 3693 ieee802_11_parse_elems( 3694 mgmt->u.action.u.ext_chan_switch.variable, 3695 ies_len, true, &elems); 3696 3697 if (elems.parse_error) 3698 break; 3699 3700 /* for the handling code pretend this was also an IE */ 3701 elems.ext_chansw_ie = 3702 &mgmt->u.action.u.ext_chan_switch.data; 3703 3704 ieee80211_sta_process_chanswitch(sdata, 3705 rx_status->mactime, 3706 rx_status->device_timestamp, 3707 &elems, false); 3708 } 3709 break; 3710 } 3711 sdata_unlock(sdata); 3712 } 3713 3714 static void ieee80211_sta_timer(unsigned long data) 3715 { 3716 struct ieee80211_sub_if_data *sdata = 3717 (struct ieee80211_sub_if_data *) data; 3718 3719 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3720 } 3721 3722 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3723 u8 *bssid, u8 reason, bool tx) 3724 { 3725 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3726 3727 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3728 tx, frame_buf); 3729 3730 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3731 reason); 3732 } 3733 3734 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3735 { 3736 struct ieee80211_local *local = sdata->local; 3737 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3738 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3739 u32 tx_flags = 0; 3740 u16 trans = 1; 3741 u16 status = 0; 3742 3743 sdata_assert_lock(sdata); 3744 3745 if (WARN_ON_ONCE(!auth_data)) 3746 return -EINVAL; 3747 3748 auth_data->tries++; 3749 3750 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3751 sdata_info(sdata, "authentication with %pM timed out\n", 3752 auth_data->bss->bssid); 3753 3754 /* 3755 * Most likely AP is not in the range so remove the 3756 * bss struct for that AP. 3757 */ 3758 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3759 3760 return -ETIMEDOUT; 3761 } 3762 3763 drv_mgd_prepare_tx(local, sdata); 3764 3765 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3766 auth_data->bss->bssid, auth_data->tries, 3767 IEEE80211_AUTH_MAX_TRIES); 3768 3769 auth_data->expected_transaction = 2; 3770 3771 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3772 trans = auth_data->sae_trans; 3773 status = auth_data->sae_status; 3774 auth_data->expected_transaction = trans; 3775 } 3776 3777 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3778 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3779 IEEE80211_TX_INTFL_MLME_CONN_TX; 3780 3781 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3782 auth_data->data, auth_data->data_len, 3783 auth_data->bss->bssid, 3784 auth_data->bss->bssid, NULL, 0, 0, 3785 tx_flags); 3786 3787 if (tx_flags == 0) { 3788 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3789 auth_data->timeout_started = true; 3790 run_again(sdata, auth_data->timeout); 3791 } else { 3792 auth_data->timeout = 3793 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3794 auth_data->timeout_started = true; 3795 run_again(sdata, auth_data->timeout); 3796 } 3797 3798 return 0; 3799 } 3800 3801 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3802 { 3803 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3804 struct ieee80211_local *local = sdata->local; 3805 3806 sdata_assert_lock(sdata); 3807 3808 assoc_data->tries++; 3809 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3810 sdata_info(sdata, "association with %pM timed out\n", 3811 assoc_data->bss->bssid); 3812 3813 /* 3814 * Most likely AP is not in the range so remove the 3815 * bss struct for that AP. 3816 */ 3817 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3818 3819 return -ETIMEDOUT; 3820 } 3821 3822 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3823 assoc_data->bss->bssid, assoc_data->tries, 3824 IEEE80211_ASSOC_MAX_TRIES); 3825 ieee80211_send_assoc(sdata); 3826 3827 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3828 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3829 assoc_data->timeout_started = true; 3830 run_again(sdata, assoc_data->timeout); 3831 } else { 3832 assoc_data->timeout = 3833 round_jiffies_up(jiffies + 3834 IEEE80211_ASSOC_TIMEOUT_LONG); 3835 assoc_data->timeout_started = true; 3836 run_again(sdata, assoc_data->timeout); 3837 } 3838 3839 return 0; 3840 } 3841 3842 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3843 __le16 fc, bool acked) 3844 { 3845 struct ieee80211_local *local = sdata->local; 3846 3847 sdata->u.mgd.status_fc = fc; 3848 sdata->u.mgd.status_acked = acked; 3849 sdata->u.mgd.status_received = true; 3850 3851 ieee80211_queue_work(&local->hw, &sdata->work); 3852 } 3853 3854 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3855 { 3856 struct ieee80211_local *local = sdata->local; 3857 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3858 3859 sdata_lock(sdata); 3860 3861 if (ifmgd->status_received) { 3862 __le16 fc = ifmgd->status_fc; 3863 bool status_acked = ifmgd->status_acked; 3864 3865 ifmgd->status_received = false; 3866 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3867 if (status_acked) { 3868 ifmgd->auth_data->timeout = 3869 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3870 run_again(sdata, ifmgd->auth_data->timeout); 3871 } else { 3872 ifmgd->auth_data->timeout = jiffies - 1; 3873 } 3874 ifmgd->auth_data->timeout_started = true; 3875 } else if (ifmgd->assoc_data && 3876 (ieee80211_is_assoc_req(fc) || 3877 ieee80211_is_reassoc_req(fc))) { 3878 if (status_acked) { 3879 ifmgd->assoc_data->timeout = 3880 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3881 run_again(sdata, ifmgd->assoc_data->timeout); 3882 } else { 3883 ifmgd->assoc_data->timeout = jiffies - 1; 3884 } 3885 ifmgd->assoc_data->timeout_started = true; 3886 } 3887 } 3888 3889 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3890 time_after(jiffies, ifmgd->auth_data->timeout)) { 3891 if (ifmgd->auth_data->done) { 3892 /* 3893 * ok ... we waited for assoc but userspace didn't, 3894 * so let's just kill the auth data 3895 */ 3896 ieee80211_destroy_auth_data(sdata, false); 3897 } else if (ieee80211_auth(sdata)) { 3898 u8 bssid[ETH_ALEN]; 3899 struct ieee80211_event event = { 3900 .type = MLME_EVENT, 3901 .u.mlme.data = AUTH_EVENT, 3902 .u.mlme.status = MLME_TIMEOUT, 3903 }; 3904 3905 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3906 3907 ieee80211_destroy_auth_data(sdata, false); 3908 3909 cfg80211_auth_timeout(sdata->dev, bssid); 3910 drv_event_callback(sdata->local, sdata, &event); 3911 } 3912 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3913 run_again(sdata, ifmgd->auth_data->timeout); 3914 3915 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3916 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3917 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3918 ieee80211_do_assoc(sdata)) { 3919 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3920 struct ieee80211_event event = { 3921 .type = MLME_EVENT, 3922 .u.mlme.data = ASSOC_EVENT, 3923 .u.mlme.status = MLME_TIMEOUT, 3924 }; 3925 3926 ieee80211_destroy_assoc_data(sdata, false, false); 3927 cfg80211_assoc_timeout(sdata->dev, bss); 3928 drv_event_callback(sdata->local, sdata, &event); 3929 } 3930 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3931 run_again(sdata, ifmgd->assoc_data->timeout); 3932 3933 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3934 ifmgd->associated) { 3935 u8 bssid[ETH_ALEN]; 3936 int max_tries; 3937 3938 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3939 3940 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3941 max_tries = max_nullfunc_tries; 3942 else 3943 max_tries = max_probe_tries; 3944 3945 /* ACK received for nullfunc probing frame */ 3946 if (!ifmgd->probe_send_count) 3947 ieee80211_reset_ap_probe(sdata); 3948 else if (ifmgd->nullfunc_failed) { 3949 if (ifmgd->probe_send_count < max_tries) { 3950 mlme_dbg(sdata, 3951 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3952 bssid, ifmgd->probe_send_count, 3953 max_tries); 3954 ieee80211_mgd_probe_ap_send(sdata); 3955 } else { 3956 mlme_dbg(sdata, 3957 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3958 bssid); 3959 ieee80211_sta_connection_lost(sdata, bssid, 3960 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3961 false); 3962 } 3963 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3964 run_again(sdata, ifmgd->probe_timeout); 3965 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3966 mlme_dbg(sdata, 3967 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3968 bssid, probe_wait_ms); 3969 ieee80211_sta_connection_lost(sdata, bssid, 3970 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3971 } else if (ifmgd->probe_send_count < max_tries) { 3972 mlme_dbg(sdata, 3973 "No probe response from AP %pM after %dms, try %d/%i\n", 3974 bssid, probe_wait_ms, 3975 ifmgd->probe_send_count, max_tries); 3976 ieee80211_mgd_probe_ap_send(sdata); 3977 } else { 3978 /* 3979 * We actually lost the connection ... or did we? 3980 * Let's make sure! 3981 */ 3982 mlme_dbg(sdata, 3983 "No probe response from AP %pM after %dms, disconnecting.\n", 3984 bssid, probe_wait_ms); 3985 3986 ieee80211_sta_connection_lost(sdata, bssid, 3987 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3988 } 3989 } 3990 3991 sdata_unlock(sdata); 3992 } 3993 3994 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3995 { 3996 struct ieee80211_sub_if_data *sdata = 3997 (struct ieee80211_sub_if_data *) data; 3998 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3999 4000 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 4001 return; 4002 4003 sdata->u.mgd.connection_loss = false; 4004 ieee80211_queue_work(&sdata->local->hw, 4005 &sdata->u.mgd.beacon_connection_loss_work); 4006 } 4007 4008 static void ieee80211_sta_conn_mon_timer(unsigned long data) 4009 { 4010 struct ieee80211_sub_if_data *sdata = 4011 (struct ieee80211_sub_if_data *) data; 4012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4013 struct ieee80211_local *local = sdata->local; 4014 4015 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 4016 return; 4017 4018 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 4019 } 4020 4021 static void ieee80211_sta_monitor_work(struct work_struct *work) 4022 { 4023 struct ieee80211_sub_if_data *sdata = 4024 container_of(work, struct ieee80211_sub_if_data, 4025 u.mgd.monitor_work); 4026 4027 ieee80211_mgd_probe_ap(sdata, false); 4028 } 4029 4030 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 4031 { 4032 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 4033 __ieee80211_stop_poll(sdata); 4034 4035 /* let's probe the connection once */ 4036 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 4037 ieee80211_queue_work(&sdata->local->hw, 4038 &sdata->u.mgd.monitor_work); 4039 } 4040 } 4041 4042 #ifdef CONFIG_PM 4043 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4044 { 4045 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4046 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4047 4048 sdata_lock(sdata); 4049 4050 if (ifmgd->auth_data || ifmgd->assoc_data) { 4051 const u8 *bssid = ifmgd->auth_data ? 4052 ifmgd->auth_data->bss->bssid : 4053 ifmgd->assoc_data->bss->bssid; 4054 4055 /* 4056 * If we are trying to authenticate / associate while suspending, 4057 * cfg80211 won't know and won't actually abort those attempts, 4058 * thus we need to do that ourselves. 4059 */ 4060 ieee80211_send_deauth_disassoc(sdata, bssid, 4061 IEEE80211_STYPE_DEAUTH, 4062 WLAN_REASON_DEAUTH_LEAVING, 4063 false, frame_buf); 4064 if (ifmgd->assoc_data) 4065 ieee80211_destroy_assoc_data(sdata, false, true); 4066 if (ifmgd->auth_data) 4067 ieee80211_destroy_auth_data(sdata, false); 4068 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4069 IEEE80211_DEAUTH_FRAME_LEN); 4070 } 4071 4072 /* This is a bit of a hack - we should find a better and more generic 4073 * solution to this. Normally when suspending, cfg80211 will in fact 4074 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4075 * auth (not so important) or assoc (this is the problem) process. 4076 * 4077 * As a consequence, it can happen that we are in the process of both 4078 * associating and suspending, and receive an association response 4079 * after cfg80211 has checked if it needs to disconnect, but before 4080 * we actually set the flag to drop incoming frames. This will then 4081 * cause the workqueue flush to process the association response in 4082 * the suspend, resulting in a successful association just before it 4083 * tries to remove the interface from the driver, which now though 4084 * has a channel context assigned ... this results in issues. 4085 * 4086 * To work around this (for now) simply deauth here again if we're 4087 * now connected. 4088 */ 4089 if (ifmgd->associated && !sdata->local->wowlan) { 4090 u8 bssid[ETH_ALEN]; 4091 struct cfg80211_deauth_request req = { 4092 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4093 .bssid = bssid, 4094 }; 4095 4096 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4097 ieee80211_mgd_deauth(sdata, &req); 4098 } 4099 4100 sdata_unlock(sdata); 4101 } 4102 4103 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4104 { 4105 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4106 4107 sdata_lock(sdata); 4108 if (!ifmgd->associated) { 4109 sdata_unlock(sdata); 4110 return; 4111 } 4112 4113 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4114 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4115 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4116 ieee80211_sta_connection_lost(sdata, 4117 ifmgd->associated->bssid, 4118 WLAN_REASON_UNSPECIFIED, 4119 true); 4120 sdata_unlock(sdata); 4121 return; 4122 } 4123 sdata_unlock(sdata); 4124 } 4125 #endif 4126 4127 /* interface setup */ 4128 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4129 { 4130 struct ieee80211_if_managed *ifmgd; 4131 4132 ifmgd = &sdata->u.mgd; 4133 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4134 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4135 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4136 ieee80211_beacon_connection_loss_work); 4137 INIT_WORK(&ifmgd->csa_connection_drop_work, 4138 ieee80211_csa_connection_drop_work); 4139 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4140 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4141 ieee80211_tdls_peer_del_work); 4142 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4143 (unsigned long) sdata); 4144 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4145 (unsigned long) sdata); 4146 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4147 (unsigned long) sdata); 4148 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4149 (unsigned long) sdata); 4150 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4151 ieee80211_sta_handle_tspec_ac_params_wk); 4152 4153 ifmgd->flags = 0; 4154 ifmgd->powersave = sdata->wdev.ps; 4155 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4156 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4157 ifmgd->p2p_noa_index = -1; 4158 4159 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4160 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4161 else 4162 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4163 4164 /* Setup TDLS data */ 4165 spin_lock_init(&ifmgd->teardown_lock); 4166 ifmgd->teardown_skb = NULL; 4167 ifmgd->orig_teardown_skb = NULL; 4168 } 4169 4170 /* scan finished notification */ 4171 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4172 { 4173 struct ieee80211_sub_if_data *sdata; 4174 4175 /* Restart STA timers */ 4176 rcu_read_lock(); 4177 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4178 if (ieee80211_sdata_running(sdata)) 4179 ieee80211_restart_sta_timer(sdata); 4180 } 4181 rcu_read_unlock(); 4182 } 4183 4184 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4185 struct cfg80211_bss *cbss) 4186 { 4187 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4188 const u8 *ht_cap_ie, *vht_cap_ie; 4189 const struct ieee80211_ht_cap *ht_cap; 4190 const struct ieee80211_vht_cap *vht_cap; 4191 u8 chains = 1; 4192 4193 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4194 return chains; 4195 4196 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4197 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4198 ht_cap = (void *)(ht_cap_ie + 2); 4199 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4200 /* 4201 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4202 * "Tx Unequal Modulation Supported" fields. 4203 */ 4204 } 4205 4206 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4207 return chains; 4208 4209 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4210 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4211 u8 nss; 4212 u16 tx_mcs_map; 4213 4214 vht_cap = (void *)(vht_cap_ie + 2); 4215 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4216 for (nss = 8; nss > 0; nss--) { 4217 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4218 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4219 break; 4220 } 4221 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4222 chains = max(chains, nss); 4223 } 4224 4225 return chains; 4226 } 4227 4228 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4229 struct cfg80211_bss *cbss) 4230 { 4231 struct ieee80211_local *local = sdata->local; 4232 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4233 const struct ieee80211_ht_cap *ht_cap = NULL; 4234 const struct ieee80211_ht_operation *ht_oper = NULL; 4235 const struct ieee80211_vht_operation *vht_oper = NULL; 4236 struct ieee80211_supported_band *sband; 4237 struct cfg80211_chan_def chandef; 4238 int ret; 4239 u32 i; 4240 bool have_80mhz; 4241 4242 sband = local->hw.wiphy->bands[cbss->channel->band]; 4243 4244 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4245 IEEE80211_STA_DISABLE_80P80MHZ | 4246 IEEE80211_STA_DISABLE_160MHZ); 4247 4248 rcu_read_lock(); 4249 4250 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4251 sband->ht_cap.ht_supported) { 4252 const u8 *ht_oper_ie, *ht_cap_ie; 4253 4254 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4255 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4256 ht_oper = (void *)(ht_oper_ie + 2); 4257 4258 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4259 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4260 ht_cap = (void *)(ht_cap_ie + 2); 4261 4262 if (!ht_cap) { 4263 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4264 ht_oper = NULL; 4265 } 4266 } 4267 4268 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4269 sband->vht_cap.vht_supported) { 4270 const u8 *vht_oper_ie, *vht_cap; 4271 4272 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4273 WLAN_EID_VHT_OPERATION); 4274 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4275 vht_oper = (void *)(vht_oper_ie + 2); 4276 if (vht_oper && !ht_oper) { 4277 vht_oper = NULL; 4278 sdata_info(sdata, 4279 "AP advertised VHT without HT, disabling both\n"); 4280 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4281 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4282 } 4283 4284 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4285 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4286 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4287 vht_oper = NULL; 4288 } 4289 } 4290 4291 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4292 have_80mhz = false; 4293 for (i = 0; i < sband->n_channels; i++) { 4294 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4295 IEEE80211_CHAN_NO_80MHZ)) 4296 continue; 4297 4298 have_80mhz = true; 4299 break; 4300 } 4301 4302 if (!have_80mhz) 4303 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4304 4305 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4306 cbss->channel, 4307 ht_oper, vht_oper, 4308 &chandef, false); 4309 4310 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4311 local->rx_chains); 4312 4313 rcu_read_unlock(); 4314 4315 /* will change later if needed */ 4316 sdata->smps_mode = IEEE80211_SMPS_OFF; 4317 4318 mutex_lock(&local->mtx); 4319 /* 4320 * If this fails (possibly due to channel context sharing 4321 * on incompatible channels, e.g. 80+80 and 160 sharing the 4322 * same control channel) try to use a smaller bandwidth. 4323 */ 4324 ret = ieee80211_vif_use_channel(sdata, &chandef, 4325 IEEE80211_CHANCTX_SHARED); 4326 4327 /* don't downgrade for 5 and 10 MHz channels, though. */ 4328 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4329 chandef.width == NL80211_CHAN_WIDTH_10) 4330 goto out; 4331 4332 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4333 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4334 ret = ieee80211_vif_use_channel(sdata, &chandef, 4335 IEEE80211_CHANCTX_SHARED); 4336 } 4337 out: 4338 mutex_unlock(&local->mtx); 4339 return ret; 4340 } 4341 4342 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4343 struct cfg80211_bss *cbss, bool assoc, 4344 bool override) 4345 { 4346 struct ieee80211_local *local = sdata->local; 4347 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4348 struct ieee80211_bss *bss = (void *)cbss->priv; 4349 struct sta_info *new_sta = NULL; 4350 struct ieee80211_supported_band *sband; 4351 bool have_sta = false; 4352 int err; 4353 4354 sband = local->hw.wiphy->bands[cbss->channel->band]; 4355 4356 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4357 return -EINVAL; 4358 4359 /* If a reconfig is happening, bail out */ 4360 if (local->in_reconfig) 4361 return -EBUSY; 4362 4363 if (assoc) { 4364 rcu_read_lock(); 4365 have_sta = sta_info_get(sdata, cbss->bssid); 4366 rcu_read_unlock(); 4367 } 4368 4369 if (!have_sta) { 4370 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4371 if (!new_sta) 4372 return -ENOMEM; 4373 } 4374 4375 /* 4376 * Set up the information for the new channel before setting the 4377 * new channel. We can't - completely race-free - change the basic 4378 * rates bitmap and the channel (sband) that it refers to, but if 4379 * we set it up before we at least avoid calling into the driver's 4380 * bss_info_changed() method with invalid information (since we do 4381 * call that from changing the channel - only for IDLE and perhaps 4382 * some others, but ...). 4383 * 4384 * So to avoid that, just set up all the new information before the 4385 * channel, but tell the driver to apply it only afterwards, since 4386 * it might need the new channel for that. 4387 */ 4388 if (new_sta) { 4389 u32 rates = 0, basic_rates = 0; 4390 bool have_higher_than_11mbit; 4391 int min_rate = INT_MAX, min_rate_index = -1; 4392 const struct cfg80211_bss_ies *ies; 4393 int shift = ieee80211_vif_get_shift(&sdata->vif); 4394 4395 ieee80211_get_rates(sband, bss->supp_rates, 4396 bss->supp_rates_len, 4397 &rates, &basic_rates, 4398 &have_higher_than_11mbit, 4399 &min_rate, &min_rate_index, 4400 shift); 4401 4402 /* 4403 * This used to be a workaround for basic rates missing 4404 * in the association response frame. Now that we no 4405 * longer use the basic rates from there, it probably 4406 * doesn't happen any more, but keep the workaround so 4407 * in case some *other* APs are buggy in different ways 4408 * we can connect -- with a warning. 4409 */ 4410 if (!basic_rates && min_rate_index >= 0) { 4411 sdata_info(sdata, 4412 "No basic rates, using min rate instead\n"); 4413 basic_rates = BIT(min_rate_index); 4414 } 4415 4416 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4417 sdata->vif.bss_conf.basic_rates = basic_rates; 4418 4419 /* cf. IEEE 802.11 9.2.12 */ 4420 if (cbss->channel->band == NL80211_BAND_2GHZ && 4421 have_higher_than_11mbit) 4422 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4423 else 4424 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4425 4426 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4427 4428 /* set timing information */ 4429 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4430 rcu_read_lock(); 4431 ies = rcu_dereference(cbss->beacon_ies); 4432 if (ies) { 4433 const u8 *tim_ie; 4434 4435 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4436 sdata->vif.bss_conf.sync_device_ts = 4437 bss->device_ts_beacon; 4438 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4439 ies->data, ies->len); 4440 if (tim_ie && tim_ie[1] >= 2) 4441 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4442 else 4443 sdata->vif.bss_conf.sync_dtim_count = 0; 4444 } else if (!ieee80211_hw_check(&sdata->local->hw, 4445 TIMING_BEACON_ONLY)) { 4446 ies = rcu_dereference(cbss->proberesp_ies); 4447 /* must be non-NULL since beacon IEs were NULL */ 4448 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4449 sdata->vif.bss_conf.sync_device_ts = 4450 bss->device_ts_presp; 4451 sdata->vif.bss_conf.sync_dtim_count = 0; 4452 } else { 4453 sdata->vif.bss_conf.sync_tsf = 0; 4454 sdata->vif.bss_conf.sync_device_ts = 0; 4455 sdata->vif.bss_conf.sync_dtim_count = 0; 4456 } 4457 rcu_read_unlock(); 4458 } 4459 4460 if (new_sta || override) { 4461 err = ieee80211_prep_channel(sdata, cbss); 4462 if (err) { 4463 if (new_sta) 4464 sta_info_free(local, new_sta); 4465 return -EINVAL; 4466 } 4467 } 4468 4469 if (new_sta) { 4470 /* 4471 * tell driver about BSSID, basic rates and timing 4472 * this was set up above, before setting the channel 4473 */ 4474 ieee80211_bss_info_change_notify(sdata, 4475 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4476 BSS_CHANGED_BEACON_INT); 4477 4478 if (assoc) 4479 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4480 4481 err = sta_info_insert(new_sta); 4482 new_sta = NULL; 4483 if (err) { 4484 sdata_info(sdata, 4485 "failed to insert STA entry for the AP (error %d)\n", 4486 err); 4487 return err; 4488 } 4489 } else 4490 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4491 4492 /* Cancel scan to ensure that nothing interferes with connection */ 4493 if (local->scanning) 4494 ieee80211_scan_cancel(local); 4495 4496 return 0; 4497 } 4498 4499 /* config hooks */ 4500 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4501 struct cfg80211_auth_request *req) 4502 { 4503 struct ieee80211_local *local = sdata->local; 4504 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4505 struct ieee80211_mgd_auth_data *auth_data; 4506 u16 auth_alg; 4507 int err; 4508 4509 /* prepare auth data structure */ 4510 4511 switch (req->auth_type) { 4512 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4513 auth_alg = WLAN_AUTH_OPEN; 4514 break; 4515 case NL80211_AUTHTYPE_SHARED_KEY: 4516 if (IS_ERR(local->wep_tx_tfm)) 4517 return -EOPNOTSUPP; 4518 auth_alg = WLAN_AUTH_SHARED_KEY; 4519 break; 4520 case NL80211_AUTHTYPE_FT: 4521 auth_alg = WLAN_AUTH_FT; 4522 break; 4523 case NL80211_AUTHTYPE_NETWORK_EAP: 4524 auth_alg = WLAN_AUTH_LEAP; 4525 break; 4526 case NL80211_AUTHTYPE_SAE: 4527 auth_alg = WLAN_AUTH_SAE; 4528 break; 4529 case NL80211_AUTHTYPE_FILS_SK: 4530 auth_alg = WLAN_AUTH_FILS_SK; 4531 break; 4532 case NL80211_AUTHTYPE_FILS_SK_PFS: 4533 auth_alg = WLAN_AUTH_FILS_SK_PFS; 4534 break; 4535 case NL80211_AUTHTYPE_FILS_PK: 4536 auth_alg = WLAN_AUTH_FILS_PK; 4537 break; 4538 default: 4539 return -EOPNOTSUPP; 4540 } 4541 4542 auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len + 4543 req->ie_len, GFP_KERNEL); 4544 if (!auth_data) 4545 return -ENOMEM; 4546 4547 auth_data->bss = req->bss; 4548 4549 if (req->auth_data_len >= 4) { 4550 if (req->auth_type == NL80211_AUTHTYPE_SAE) { 4551 __le16 *pos = (__le16 *) req->auth_data; 4552 4553 auth_data->sae_trans = le16_to_cpu(pos[0]); 4554 auth_data->sae_status = le16_to_cpu(pos[1]); 4555 } 4556 memcpy(auth_data->data, req->auth_data + 4, 4557 req->auth_data_len - 4); 4558 auth_data->data_len += req->auth_data_len - 4; 4559 } 4560 4561 if (req->ie && req->ie_len) { 4562 memcpy(&auth_data->data[auth_data->data_len], 4563 req->ie, req->ie_len); 4564 auth_data->data_len += req->ie_len; 4565 } 4566 4567 if (req->key && req->key_len) { 4568 auth_data->key_len = req->key_len; 4569 auth_data->key_idx = req->key_idx; 4570 memcpy(auth_data->key, req->key, req->key_len); 4571 } 4572 4573 auth_data->algorithm = auth_alg; 4574 4575 /* try to authenticate/probe */ 4576 4577 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4578 ifmgd->assoc_data) { 4579 err = -EBUSY; 4580 goto err_free; 4581 } 4582 4583 if (ifmgd->auth_data) 4584 ieee80211_destroy_auth_data(sdata, false); 4585 4586 /* prep auth_data so we don't go into idle on disassoc */ 4587 ifmgd->auth_data = auth_data; 4588 4589 if (ifmgd->associated) { 4590 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4591 4592 sdata_info(sdata, 4593 "disconnect from AP %pM for new auth to %pM\n", 4594 ifmgd->associated->bssid, req->bss->bssid); 4595 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4596 WLAN_REASON_UNSPECIFIED, 4597 false, frame_buf); 4598 4599 ieee80211_report_disconnect(sdata, frame_buf, 4600 sizeof(frame_buf), true, 4601 WLAN_REASON_UNSPECIFIED); 4602 } 4603 4604 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4605 4606 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4607 if (err) 4608 goto err_clear; 4609 4610 err = ieee80211_auth(sdata); 4611 if (err) { 4612 sta_info_destroy_addr(sdata, req->bss->bssid); 4613 goto err_clear; 4614 } 4615 4616 /* hold our own reference */ 4617 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4618 return 0; 4619 4620 err_clear: 4621 eth_zero_addr(ifmgd->bssid); 4622 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4623 ifmgd->auth_data = NULL; 4624 mutex_lock(&sdata->local->mtx); 4625 ieee80211_vif_release_channel(sdata); 4626 mutex_unlock(&sdata->local->mtx); 4627 err_free: 4628 kfree(auth_data); 4629 return err; 4630 } 4631 4632 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4633 struct cfg80211_assoc_request *req) 4634 { 4635 struct ieee80211_local *local = sdata->local; 4636 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4637 struct ieee80211_bss *bss = (void *)req->bss->priv; 4638 struct ieee80211_mgd_assoc_data *assoc_data; 4639 const struct cfg80211_bss_ies *beacon_ies; 4640 struct ieee80211_supported_band *sband; 4641 const u8 *ssidie, *ht_ie, *vht_ie; 4642 int i, err; 4643 bool override = false; 4644 4645 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4646 if (!assoc_data) 4647 return -ENOMEM; 4648 4649 rcu_read_lock(); 4650 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4651 if (!ssidie) { 4652 rcu_read_unlock(); 4653 kfree(assoc_data); 4654 return -EINVAL; 4655 } 4656 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4657 assoc_data->ssid_len = ssidie[1]; 4658 rcu_read_unlock(); 4659 4660 if (ifmgd->associated) { 4661 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4662 4663 sdata_info(sdata, 4664 "disconnect from AP %pM for new assoc to %pM\n", 4665 ifmgd->associated->bssid, req->bss->bssid); 4666 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4667 WLAN_REASON_UNSPECIFIED, 4668 false, frame_buf); 4669 4670 ieee80211_report_disconnect(sdata, frame_buf, 4671 sizeof(frame_buf), true, 4672 WLAN_REASON_UNSPECIFIED); 4673 } 4674 4675 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4676 err = -EBUSY; 4677 goto err_free; 4678 } 4679 4680 if (ifmgd->assoc_data) { 4681 err = -EBUSY; 4682 goto err_free; 4683 } 4684 4685 if (ifmgd->auth_data) { 4686 bool match; 4687 4688 /* keep sta info, bssid if matching */ 4689 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4690 ieee80211_destroy_auth_data(sdata, match); 4691 } 4692 4693 /* prepare assoc data */ 4694 4695 ifmgd->beacon_crc_valid = false; 4696 4697 assoc_data->wmm = bss->wmm_used && 4698 (local->hw.queues >= IEEE80211_NUM_ACS); 4699 4700 /* 4701 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4702 * We still associate in non-HT mode (11a/b/g) if any one of these 4703 * ciphers is configured as pairwise. 4704 * We can set this to true for non-11n hardware, that'll be checked 4705 * separately along with the peer capabilities. 4706 */ 4707 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4708 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4709 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4710 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4711 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4712 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4713 netdev_info(sdata->dev, 4714 "disabling HT/VHT due to WEP/TKIP use\n"); 4715 } 4716 } 4717 4718 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4719 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4720 if (!sband->ht_cap.ht_supported || 4721 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4722 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4723 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4724 if (!bss->wmm_used && 4725 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4726 netdev_info(sdata->dev, 4727 "disabling HT as WMM/QoS is not supported by the AP\n"); 4728 } 4729 4730 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4731 if (!sband->vht_cap.vht_supported || 4732 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4733 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4734 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4735 if (!bss->wmm_used && 4736 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4737 netdev_info(sdata->dev, 4738 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4739 } 4740 4741 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4742 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4743 sizeof(ifmgd->ht_capa_mask)); 4744 4745 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4746 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4747 sizeof(ifmgd->vht_capa_mask)); 4748 4749 if (req->ie && req->ie_len) { 4750 memcpy(assoc_data->ie, req->ie, req->ie_len); 4751 assoc_data->ie_len = req->ie_len; 4752 } 4753 4754 if (req->fils_kek) { 4755 /* should already be checked in cfg80211 - so warn */ 4756 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) { 4757 err = -EINVAL; 4758 goto err_free; 4759 } 4760 memcpy(assoc_data->fils_kek, req->fils_kek, 4761 req->fils_kek_len); 4762 assoc_data->fils_kek_len = req->fils_kek_len; 4763 } 4764 4765 if (req->fils_nonces) 4766 memcpy(assoc_data->fils_nonces, req->fils_nonces, 4767 2 * FILS_NONCE_LEN); 4768 4769 assoc_data->bss = req->bss; 4770 4771 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4772 if (ifmgd->powersave) 4773 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4774 else 4775 sdata->smps_mode = IEEE80211_SMPS_OFF; 4776 } else 4777 sdata->smps_mode = ifmgd->req_smps; 4778 4779 assoc_data->capability = req->bss->capability; 4780 assoc_data->supp_rates = bss->supp_rates; 4781 assoc_data->supp_rates_len = bss->supp_rates_len; 4782 4783 rcu_read_lock(); 4784 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4785 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4786 assoc_data->ap_ht_param = 4787 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4788 else 4789 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4790 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4791 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4792 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4793 sizeof(struct ieee80211_vht_cap)); 4794 else 4795 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4796 rcu_read_unlock(); 4797 4798 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4799 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4800 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4801 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4802 4803 if (bss->wmm_used && bss->uapsd_supported && 4804 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4805 assoc_data->uapsd = true; 4806 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4807 } else { 4808 assoc_data->uapsd = false; 4809 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4810 } 4811 4812 if (req->prev_bssid) 4813 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4814 4815 if (req->use_mfp) { 4816 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4817 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4818 } else { 4819 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4820 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4821 } 4822 4823 if (req->flags & ASSOC_REQ_USE_RRM) 4824 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4825 else 4826 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4827 4828 if (req->crypto.control_port) 4829 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4830 else 4831 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4832 4833 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4834 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4835 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4836 sdata->vif.type); 4837 4838 /* kick off associate process */ 4839 4840 ifmgd->assoc_data = assoc_data; 4841 ifmgd->dtim_period = 0; 4842 ifmgd->have_beacon = false; 4843 4844 /* override HT/VHT configuration only if the AP and we support it */ 4845 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4846 struct ieee80211_sta_ht_cap sta_ht_cap; 4847 4848 if (req->flags & ASSOC_REQ_DISABLE_HT) 4849 override = true; 4850 4851 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4852 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4853 4854 /* check for 40 MHz disable override */ 4855 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4856 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4857 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4858 override = true; 4859 4860 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4861 req->flags & ASSOC_REQ_DISABLE_VHT) 4862 override = true; 4863 } 4864 4865 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4866 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4867 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4868 } 4869 4870 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4871 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4872 4873 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4874 if (err) 4875 goto err_clear; 4876 4877 rcu_read_lock(); 4878 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4879 4880 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4881 !beacon_ies) { 4882 /* 4883 * Wait up to one beacon interval ... 4884 * should this be more if we miss one? 4885 */ 4886 sdata_info(sdata, "waiting for beacon from %pM\n", 4887 ifmgd->bssid); 4888 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4889 assoc_data->timeout_started = true; 4890 assoc_data->need_beacon = true; 4891 } else if (beacon_ies) { 4892 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4893 beacon_ies->data, 4894 beacon_ies->len); 4895 u8 dtim_count = 0; 4896 4897 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4898 const struct ieee80211_tim_ie *tim; 4899 tim = (void *)(tim_ie + 2); 4900 ifmgd->dtim_period = tim->dtim_period; 4901 dtim_count = tim->dtim_count; 4902 } 4903 ifmgd->have_beacon = true; 4904 assoc_data->timeout = jiffies; 4905 assoc_data->timeout_started = true; 4906 4907 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4908 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4909 sdata->vif.bss_conf.sync_device_ts = 4910 bss->device_ts_beacon; 4911 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4912 } 4913 } else { 4914 assoc_data->timeout = jiffies; 4915 assoc_data->timeout_started = true; 4916 } 4917 rcu_read_unlock(); 4918 4919 run_again(sdata, assoc_data->timeout); 4920 4921 if (bss->corrupt_data) { 4922 char *corrupt_type = "data"; 4923 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4924 if (bss->corrupt_data & 4925 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4926 corrupt_type = "beacon and probe response"; 4927 else 4928 corrupt_type = "beacon"; 4929 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4930 corrupt_type = "probe response"; 4931 sdata_info(sdata, "associating with AP with corrupt %s\n", 4932 corrupt_type); 4933 } 4934 4935 return 0; 4936 err_clear: 4937 eth_zero_addr(ifmgd->bssid); 4938 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4939 ifmgd->assoc_data = NULL; 4940 err_free: 4941 kfree(assoc_data); 4942 return err; 4943 } 4944 4945 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4946 struct cfg80211_deauth_request *req) 4947 { 4948 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4949 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4950 bool tx = !req->local_state_change; 4951 4952 if (ifmgd->auth_data && 4953 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4954 sdata_info(sdata, 4955 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4956 req->bssid, req->reason_code, 4957 ieee80211_get_reason_code_string(req->reason_code)); 4958 4959 drv_mgd_prepare_tx(sdata->local, sdata); 4960 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4961 IEEE80211_STYPE_DEAUTH, 4962 req->reason_code, tx, 4963 frame_buf); 4964 ieee80211_destroy_auth_data(sdata, false); 4965 ieee80211_report_disconnect(sdata, frame_buf, 4966 sizeof(frame_buf), true, 4967 req->reason_code); 4968 4969 return 0; 4970 } 4971 4972 if (ifmgd->assoc_data && 4973 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4974 sdata_info(sdata, 4975 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4976 req->bssid, req->reason_code, 4977 ieee80211_get_reason_code_string(req->reason_code)); 4978 4979 drv_mgd_prepare_tx(sdata->local, sdata); 4980 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4981 IEEE80211_STYPE_DEAUTH, 4982 req->reason_code, tx, 4983 frame_buf); 4984 ieee80211_destroy_assoc_data(sdata, false, true); 4985 ieee80211_report_disconnect(sdata, frame_buf, 4986 sizeof(frame_buf), true, 4987 req->reason_code); 4988 return 0; 4989 } 4990 4991 if (ifmgd->associated && 4992 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4993 sdata_info(sdata, 4994 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4995 req->bssid, req->reason_code, 4996 ieee80211_get_reason_code_string(req->reason_code)); 4997 4998 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4999 req->reason_code, tx, frame_buf); 5000 ieee80211_report_disconnect(sdata, frame_buf, 5001 sizeof(frame_buf), true, 5002 req->reason_code); 5003 return 0; 5004 } 5005 5006 return -ENOTCONN; 5007 } 5008 5009 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 5010 struct cfg80211_disassoc_request *req) 5011 { 5012 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 5013 u8 bssid[ETH_ALEN]; 5014 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 5015 5016 /* 5017 * cfg80211 should catch this ... but it's racy since 5018 * we can receive a disassoc frame, process it, hand it 5019 * to cfg80211 while that's in a locked section already 5020 * trying to tell us that the user wants to disconnect. 5021 */ 5022 if (ifmgd->associated != req->bss) 5023 return -ENOLINK; 5024 5025 sdata_info(sdata, 5026 "disassociating from %pM by local choice (Reason: %u=%s)\n", 5027 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 5028 5029 memcpy(bssid, req->bss->bssid, ETH_ALEN); 5030 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 5031 req->reason_code, !req->local_state_change, 5032 frame_buf); 5033 5034 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 5035 req->reason_code); 5036 5037 return 0; 5038 } 5039 5040 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 5041 { 5042 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 5043 5044 /* 5045 * Make sure some work items will not run after this, 5046 * they will not do anything but might not have been 5047 * cancelled when disconnecting. 5048 */ 5049 cancel_work_sync(&ifmgd->monitor_work); 5050 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 5051 cancel_work_sync(&ifmgd->request_smps_work); 5052 cancel_work_sync(&ifmgd->csa_connection_drop_work); 5053 cancel_work_sync(&ifmgd->chswitch_work); 5054 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 5055 5056 sdata_lock(sdata); 5057 if (ifmgd->assoc_data) { 5058 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 5059 ieee80211_destroy_assoc_data(sdata, false, false); 5060 cfg80211_assoc_timeout(sdata->dev, bss); 5061 } 5062 if (ifmgd->auth_data) 5063 ieee80211_destroy_auth_data(sdata, false); 5064 spin_lock_bh(&ifmgd->teardown_lock); 5065 if (ifmgd->teardown_skb) { 5066 kfree_skb(ifmgd->teardown_skb); 5067 ifmgd->teardown_skb = NULL; 5068 ifmgd->orig_teardown_skb = NULL; 5069 } 5070 spin_unlock_bh(&ifmgd->teardown_lock); 5071 del_timer_sync(&ifmgd->timer); 5072 sdata_unlock(sdata); 5073 } 5074 5075 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 5076 enum nl80211_cqm_rssi_threshold_event rssi_event, 5077 s32 rssi_level, 5078 gfp_t gfp) 5079 { 5080 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5081 5082 trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level); 5083 5084 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp); 5085 } 5086 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5087 5088 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5089 { 5090 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5091 5092 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5093 5094 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5095 } 5096 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5097