1 /* 2 * BSS client mode implementation 3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * Copyright 2013-2014 Intel Mobile Communications GmbH 9 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/delay.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/moduleparam.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/crc32.h> 24 #include <linux/slab.h> 25 #include <linux/export.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "rate.h" 32 #include "led.h" 33 34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2) 36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10) 37 #define IEEE80211_AUTH_MAX_TRIES 3 38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2) 41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 42 #define IEEE80211_ASSOC_MAX_TRIES 3 43 44 static int max_nullfunc_tries = 2; 45 module_param(max_nullfunc_tries, int, 0644); 46 MODULE_PARM_DESC(max_nullfunc_tries, 47 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 48 49 static int max_probe_tries = 5; 50 module_param(max_probe_tries, int, 0644); 51 MODULE_PARM_DESC(max_probe_tries, 52 "Maximum probe tries before disconnecting (reason 4)."); 53 54 /* 55 * Beacon loss timeout is calculated as N frames times the 56 * advertised beacon interval. This may need to be somewhat 57 * higher than what hardware might detect to account for 58 * delays in the host processing frames. But since we also 59 * probe on beacon miss before declaring the connection lost 60 * default to what we want. 61 */ 62 static int beacon_loss_count = 7; 63 module_param(beacon_loss_count, int, 0644); 64 MODULE_PARM_DESC(beacon_loss_count, 65 "Number of beacon intervals before we decide beacon was lost."); 66 67 /* 68 * Time the connection can be idle before we probe 69 * it to see if we can still talk to the AP. 70 */ 71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 72 /* 73 * Time we wait for a probe response after sending 74 * a probe request because of beacon loss or for 75 * checking the connection still works. 76 */ 77 static int probe_wait_ms = 500; 78 module_param(probe_wait_ms, int, 0644); 79 MODULE_PARM_DESC(probe_wait_ms, 80 "Maximum time(ms) to wait for probe response" 81 " before disconnecting (reason 4)."); 82 83 /* 84 * How many Beacon frames need to have been used in average signal strength 85 * before starting to indicate signal change events. 86 */ 87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 88 89 /* 90 * We can have multiple work items (and connection probing) 91 * scheduling this timer, but we need to take care to only 92 * reschedule it when it should fire _earlier_ than it was 93 * asked for before, or if it's not pending right now. This 94 * function ensures that. Note that it then is required to 95 * run this function for all timeouts after the first one 96 * has happened -- the work that runs from this timer will 97 * do that. 98 */ 99 static void run_again(struct ieee80211_sub_if_data *sdata, 100 unsigned long timeout) 101 { 102 sdata_assert_lock(sdata); 103 104 if (!timer_pending(&sdata->u.mgd.timer) || 105 time_before(timeout, sdata->u.mgd.timer.expires)) 106 mod_timer(&sdata->u.mgd.timer, timeout); 107 } 108 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 110 { 111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 112 return; 113 114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 115 return; 116 117 mod_timer(&sdata->u.mgd.bcn_mon_timer, 118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 119 } 120 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 122 { 123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 124 125 if (unlikely(!ifmgd->associated)) 126 return; 127 128 if (ifmgd->probe_send_count) 129 ifmgd->probe_send_count = 0; 130 131 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 132 return; 133 134 mod_timer(&ifmgd->conn_mon_timer, 135 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 136 } 137 138 static int ecw2cw(int ecw) 139 { 140 return (1 << ecw) - 1; 141 } 142 143 static u32 144 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 145 struct ieee80211_supported_band *sband, 146 struct ieee80211_channel *channel, 147 const struct ieee80211_ht_cap *ht_cap, 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_cap || !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 if (!(ht_cap->cap_info & 173 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) { 174 ret = IEEE80211_STA_DISABLE_40MHZ; 175 vht_chandef = *chandef; 176 goto out; 177 } 178 179 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 180 channel->band); 181 /* check that channel matches the right operating channel */ 182 if (!tracking && channel->center_freq != ht_cfreq) { 183 /* 184 * It's possible that some APs are confused here; 185 * Netgear WNDR3700 sometimes reports 4 higher than 186 * the actual channel in association responses, but 187 * since we look at probe response/beacon data here 188 * it should be OK. 189 */ 190 sdata_info(sdata, 191 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 192 channel->center_freq, ht_cfreq, 193 ht_oper->primary_chan, channel->band); 194 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 195 goto out; 196 } 197 198 /* check 40 MHz support, if we have it */ 199 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 200 ieee80211_chandef_ht_oper(ht_oper, chandef); 201 } else { 202 /* 40 MHz (and 80 MHz) must be supported for VHT */ 203 ret = IEEE80211_STA_DISABLE_VHT; 204 /* also mark 40 MHz disabled */ 205 ret |= IEEE80211_STA_DISABLE_40MHZ; 206 goto out; 207 } 208 209 if (!vht_oper || !sband->vht_cap.vht_supported) { 210 ret = IEEE80211_STA_DISABLE_VHT; 211 goto out; 212 } 213 214 vht_chandef = *chandef; 215 if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) { 216 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 217 sdata_info(sdata, 218 "AP VHT information is invalid, disable VHT\n"); 219 ret = IEEE80211_STA_DISABLE_VHT; 220 goto out; 221 } 222 223 if (!cfg80211_chandef_valid(&vht_chandef)) { 224 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 225 sdata_info(sdata, 226 "AP VHT information is invalid, disable VHT\n"); 227 ret = IEEE80211_STA_DISABLE_VHT; 228 goto out; 229 } 230 231 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 232 ret = 0; 233 goto out; 234 } 235 236 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 237 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 238 sdata_info(sdata, 239 "AP VHT information doesn't match HT, disable VHT\n"); 240 ret = IEEE80211_STA_DISABLE_VHT; 241 goto out; 242 } 243 244 *chandef = vht_chandef; 245 246 ret = 0; 247 248 out: 249 /* 250 * When tracking the current AP, don't do any further checks if the 251 * new chandef is identical to the one we're currently using for the 252 * connection. This keeps us from playing ping-pong with regulatory, 253 * without it the following can happen (for example): 254 * - connect to an AP with 80 MHz, world regdom allows 80 MHz 255 * - AP advertises regdom US 256 * - CRDA loads regdom US with 80 MHz prohibited (old database) 257 * - the code below detects an unsupported channel, downgrades, and 258 * we disconnect from the AP in the caller 259 * - disconnect causes CRDA to reload world regdomain and the game 260 * starts anew. 261 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) 262 * 263 * It seems possible that there are still scenarios with CSA or real 264 * bandwidth changes where a this could happen, but those cases are 265 * less common and wouldn't completely prevent using the AP. 266 */ 267 if (tracking && 268 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) 269 return ret; 270 271 /* don't print the message below for VHT mismatch if VHT is disabled */ 272 if (ret & IEEE80211_STA_DISABLE_VHT) 273 vht_chandef = *chandef; 274 275 /* 276 * Ignore the DISABLED flag when we're already connected and only 277 * tracking the APs beacon for bandwidth changes - otherwise we 278 * might get disconnected here if we connect to an AP, update our 279 * regulatory information based on the AP's country IE and the 280 * information we have is wrong/outdated and disables the channel 281 * that we're actually using for the connection to the AP. 282 */ 283 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 284 tracking ? 0 : 285 IEEE80211_CHAN_DISABLED)) { 286 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 287 ret = IEEE80211_STA_DISABLE_HT | 288 IEEE80211_STA_DISABLE_VHT; 289 break; 290 } 291 292 ret |= ieee80211_chandef_downgrade(chandef); 293 } 294 295 if (chandef->width != vht_chandef.width && !tracking) 296 sdata_info(sdata, 297 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 298 299 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 300 return ret; 301 } 302 303 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 304 struct sta_info *sta, 305 const struct ieee80211_ht_cap *ht_cap, 306 const struct ieee80211_ht_operation *ht_oper, 307 const struct ieee80211_vht_operation *vht_oper, 308 const u8 *bssid, u32 *changed) 309 { 310 struct ieee80211_local *local = sdata->local; 311 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 312 struct ieee80211_supported_band *sband; 313 struct ieee80211_channel *chan; 314 struct cfg80211_chan_def chandef; 315 u16 ht_opmode; 316 u32 flags; 317 enum ieee80211_sta_rx_bandwidth new_sta_bw; 318 int ret; 319 320 /* if HT was/is disabled, don't track any bandwidth changes */ 321 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 322 return 0; 323 324 /* don't check VHT if we associated as non-VHT station */ 325 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 326 vht_oper = NULL; 327 328 if (WARN_ON_ONCE(!sta)) 329 return -EINVAL; 330 331 /* 332 * if bss configuration changed store the new one - 333 * this may be applicable even if channel is identical 334 */ 335 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 336 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 337 *changed |= BSS_CHANGED_HT; 338 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 339 } 340 341 chan = sdata->vif.bss_conf.chandef.chan; 342 sband = local->hw.wiphy->bands[chan->band]; 343 344 /* calculate new channel (type) based on HT/VHT operation IEs */ 345 flags = ieee80211_determine_chantype(sdata, sband, chan, 346 ht_cap, ht_oper, vht_oper, 347 &chandef, true); 348 349 /* 350 * Downgrade the new channel if we associated with restricted 351 * capabilities. For example, if we associated as a 20 MHz STA 352 * to a 40 MHz AP (due to regulatory, capabilities or config 353 * reasons) then switching to a 40 MHz channel now won't do us 354 * any good -- we couldn't use it with the AP. 355 */ 356 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 357 chandef.width == NL80211_CHAN_WIDTH_80P80) 358 flags |= ieee80211_chandef_downgrade(&chandef); 359 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 360 chandef.width == NL80211_CHAN_WIDTH_160) 361 flags |= ieee80211_chandef_downgrade(&chandef); 362 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 363 chandef.width > NL80211_CHAN_WIDTH_20) 364 flags |= ieee80211_chandef_downgrade(&chandef); 365 366 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 367 return 0; 368 369 sdata_info(sdata, 370 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 371 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 372 chandef.center_freq1, chandef.center_freq2); 373 374 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 375 IEEE80211_STA_DISABLE_VHT | 376 IEEE80211_STA_DISABLE_40MHZ | 377 IEEE80211_STA_DISABLE_80P80MHZ | 378 IEEE80211_STA_DISABLE_160MHZ)) || 379 !cfg80211_chandef_valid(&chandef)) { 380 sdata_info(sdata, 381 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 382 ifmgd->bssid); 383 return -EINVAL; 384 } 385 386 switch (chandef.width) { 387 case NL80211_CHAN_WIDTH_20_NOHT: 388 case NL80211_CHAN_WIDTH_20: 389 new_sta_bw = IEEE80211_STA_RX_BW_20; 390 break; 391 case NL80211_CHAN_WIDTH_40: 392 new_sta_bw = IEEE80211_STA_RX_BW_40; 393 break; 394 case NL80211_CHAN_WIDTH_80: 395 new_sta_bw = IEEE80211_STA_RX_BW_80; 396 break; 397 case NL80211_CHAN_WIDTH_80P80: 398 case NL80211_CHAN_WIDTH_160: 399 new_sta_bw = IEEE80211_STA_RX_BW_160; 400 break; 401 default: 402 return -EINVAL; 403 } 404 405 if (new_sta_bw > sta->cur_max_bandwidth) 406 new_sta_bw = sta->cur_max_bandwidth; 407 408 if (new_sta_bw < sta->sta.bandwidth) { 409 sta->sta.bandwidth = new_sta_bw; 410 rate_control_rate_update(local, sband, sta, 411 IEEE80211_RC_BW_CHANGED); 412 } 413 414 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 415 if (ret) { 416 sdata_info(sdata, 417 "AP %pM changed bandwidth to incompatible one - disconnect\n", 418 ifmgd->bssid); 419 return ret; 420 } 421 422 if (new_sta_bw > sta->sta.bandwidth) { 423 sta->sta.bandwidth = new_sta_bw; 424 rate_control_rate_update(local, sband, sta, 425 IEEE80211_RC_BW_CHANGED); 426 } 427 428 return 0; 429 } 430 431 /* frame sending functions */ 432 433 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 434 struct sk_buff *skb, u8 ap_ht_param, 435 struct ieee80211_supported_band *sband, 436 struct ieee80211_channel *channel, 437 enum ieee80211_smps_mode smps) 438 { 439 u8 *pos; 440 u32 flags = channel->flags; 441 u16 cap; 442 struct ieee80211_sta_ht_cap ht_cap; 443 444 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 445 446 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 447 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 448 449 /* determine capability flags */ 450 cap = ht_cap.cap; 451 452 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 453 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 454 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 455 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 456 cap &= ~IEEE80211_HT_CAP_SGI_40; 457 } 458 break; 459 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 460 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 461 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 462 cap &= ~IEEE80211_HT_CAP_SGI_40; 463 } 464 break; 465 } 466 467 /* 468 * If 40 MHz was disabled associate as though we weren't 469 * capable of 40 MHz -- some broken APs will never fall 470 * back to trying to transmit in 20 MHz. 471 */ 472 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 473 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 474 cap &= ~IEEE80211_HT_CAP_SGI_40; 475 } 476 477 /* set SM PS mode properly */ 478 cap &= ~IEEE80211_HT_CAP_SM_PS; 479 switch (smps) { 480 case IEEE80211_SMPS_AUTOMATIC: 481 case IEEE80211_SMPS_NUM_MODES: 482 WARN_ON(1); 483 case IEEE80211_SMPS_OFF: 484 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 485 IEEE80211_HT_CAP_SM_PS_SHIFT; 486 break; 487 case IEEE80211_SMPS_STATIC: 488 cap |= WLAN_HT_CAP_SM_PS_STATIC << 489 IEEE80211_HT_CAP_SM_PS_SHIFT; 490 break; 491 case IEEE80211_SMPS_DYNAMIC: 492 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 493 IEEE80211_HT_CAP_SM_PS_SHIFT; 494 break; 495 } 496 497 /* reserve and fill IE */ 498 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 499 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 500 } 501 502 /* This function determines vht capability flags for the association 503 * and builds the IE. 504 * Note - the function may set the owner of the MU-MIMO capability 505 */ 506 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 507 struct sk_buff *skb, 508 struct ieee80211_supported_band *sband, 509 struct ieee80211_vht_cap *ap_vht_cap) 510 { 511 struct ieee80211_local *local = sdata->local; 512 u8 *pos; 513 u32 cap; 514 struct ieee80211_sta_vht_cap vht_cap; 515 u32 mask, ap_bf_sts, our_bf_sts; 516 517 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 518 519 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 520 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 521 522 /* determine capability flags */ 523 cap = vht_cap.cap; 524 525 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 526 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 527 528 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 529 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 530 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 531 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 532 } 533 534 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 535 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 536 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 537 } 538 539 /* 540 * Some APs apparently get confused if our capabilities are better 541 * than theirs, so restrict what we advertise in the assoc request. 542 */ 543 if (!(ap_vht_cap->vht_cap_info & 544 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 545 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 546 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE); 547 else if (!(ap_vht_cap->vht_cap_info & 548 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE))) 549 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 550 551 /* 552 * If some other vif is using the MU-MIMO capablity we cannot associate 553 * using MU-MIMO - this will lead to contradictions in the group-id 554 * mechanism. 555 * Ownership is defined since association request, in order to avoid 556 * simultaneous associations with MU-MIMO. 557 */ 558 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) { 559 bool disable_mu_mimo = false; 560 struct ieee80211_sub_if_data *other; 561 562 list_for_each_entry_rcu(other, &local->interfaces, list) { 563 if (other->vif.mu_mimo_owner) { 564 disable_mu_mimo = true; 565 break; 566 } 567 } 568 if (disable_mu_mimo) 569 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 570 else 571 sdata->vif.mu_mimo_owner = true; 572 } 573 574 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 575 576 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 577 our_bf_sts = cap & mask; 578 579 if (ap_bf_sts < our_bf_sts) { 580 cap &= ~mask; 581 cap |= ap_bf_sts; 582 } 583 584 /* reserve and fill IE */ 585 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 586 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 587 } 588 589 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 590 { 591 struct ieee80211_local *local = sdata->local; 592 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 593 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 594 struct sk_buff *skb; 595 struct ieee80211_mgmt *mgmt; 596 u8 *pos, qos_info; 597 size_t offset = 0, noffset; 598 int i, count, rates_len, supp_rates_len, shift; 599 u16 capab; 600 struct ieee80211_supported_band *sband; 601 struct ieee80211_chanctx_conf *chanctx_conf; 602 struct ieee80211_channel *chan; 603 u32 rate_flags, rates = 0; 604 605 sdata_assert_lock(sdata); 606 607 rcu_read_lock(); 608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 609 if (WARN_ON(!chanctx_conf)) { 610 rcu_read_unlock(); 611 return; 612 } 613 chan = chanctx_conf->def.chan; 614 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 615 rcu_read_unlock(); 616 sband = local->hw.wiphy->bands[chan->band]; 617 shift = ieee80211_vif_get_shift(&sdata->vif); 618 619 if (assoc_data->supp_rates_len) { 620 /* 621 * Get all rates supported by the device and the AP as 622 * some APs don't like getting a superset of their rates 623 * in the association request (e.g. D-Link DAP 1353 in 624 * b-only mode)... 625 */ 626 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 627 assoc_data->supp_rates, 628 assoc_data->supp_rates_len, 629 &rates); 630 } else { 631 /* 632 * In case AP not provide any supported rates information 633 * before association, we send information element(s) with 634 * all rates that we support. 635 */ 636 rates_len = 0; 637 for (i = 0; i < sband->n_bitrates; i++) { 638 if ((rate_flags & sband->bitrates[i].flags) 639 != rate_flags) 640 continue; 641 rates |= BIT(i); 642 rates_len++; 643 } 644 } 645 646 skb = alloc_skb(local->hw.extra_tx_headroom + 647 sizeof(*mgmt) + /* bit too much but doesn't matter */ 648 2 + assoc_data->ssid_len + /* SSID */ 649 4 + rates_len + /* (extended) rates */ 650 4 + /* power capability */ 651 2 + 2 * sband->n_channels + /* supported channels */ 652 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 653 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 654 assoc_data->ie_len + /* extra IEs */ 655 9, /* WMM */ 656 GFP_KERNEL); 657 if (!skb) 658 return; 659 660 skb_reserve(skb, local->hw.extra_tx_headroom); 661 662 capab = WLAN_CAPABILITY_ESS; 663 664 if (sband->band == NL80211_BAND_2GHZ) { 665 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 666 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 667 } 668 669 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 670 capab |= WLAN_CAPABILITY_PRIVACY; 671 672 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 673 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT)) 674 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 675 676 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 677 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 678 679 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 680 memset(mgmt, 0, 24); 681 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 682 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 683 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 684 685 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 686 skb_put(skb, 10); 687 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 688 IEEE80211_STYPE_REASSOC_REQ); 689 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 690 mgmt->u.reassoc_req.listen_interval = 691 cpu_to_le16(local->hw.conf.listen_interval); 692 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 693 ETH_ALEN); 694 } else { 695 skb_put(skb, 4); 696 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 697 IEEE80211_STYPE_ASSOC_REQ); 698 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 699 mgmt->u.assoc_req.listen_interval = 700 cpu_to_le16(local->hw.conf.listen_interval); 701 } 702 703 /* SSID */ 704 pos = skb_put(skb, 2 + assoc_data->ssid_len); 705 *pos++ = WLAN_EID_SSID; 706 *pos++ = assoc_data->ssid_len; 707 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 708 709 /* add all rates which were marked to be used above */ 710 supp_rates_len = rates_len; 711 if (supp_rates_len > 8) 712 supp_rates_len = 8; 713 714 pos = skb_put(skb, supp_rates_len + 2); 715 *pos++ = WLAN_EID_SUPP_RATES; 716 *pos++ = supp_rates_len; 717 718 count = 0; 719 for (i = 0; i < sband->n_bitrates; i++) { 720 if (BIT(i) & rates) { 721 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 722 5 * (1 << shift)); 723 *pos++ = (u8) rate; 724 if (++count == 8) 725 break; 726 } 727 } 728 729 if (rates_len > count) { 730 pos = skb_put(skb, rates_len - count + 2); 731 *pos++ = WLAN_EID_EXT_SUPP_RATES; 732 *pos++ = rates_len - count; 733 734 for (i++; i < sband->n_bitrates; i++) { 735 if (BIT(i) & rates) { 736 int rate; 737 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 738 5 * (1 << shift)); 739 *pos++ = (u8) rate; 740 } 741 } 742 } 743 744 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 745 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 746 pos = skb_put(skb, 4); 747 *pos++ = WLAN_EID_PWR_CAPABILITY; 748 *pos++ = 2; 749 *pos++ = 0; /* min tx power */ 750 /* max tx power */ 751 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 752 } 753 754 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 755 /* TODO: get this in reg domain format */ 756 pos = skb_put(skb, 2 * sband->n_channels + 2); 757 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 758 *pos++ = 2 * sband->n_channels; 759 for (i = 0; i < sband->n_channels; i++) { 760 *pos++ = ieee80211_frequency_to_channel( 761 sband->channels[i].center_freq); 762 *pos++ = 1; /* one channel in the subband*/ 763 } 764 } 765 766 /* if present, add any custom IEs that go before HT */ 767 if (assoc_data->ie_len) { 768 static const u8 before_ht[] = { 769 WLAN_EID_SSID, 770 WLAN_EID_SUPP_RATES, 771 WLAN_EID_EXT_SUPP_RATES, 772 WLAN_EID_PWR_CAPABILITY, 773 WLAN_EID_SUPPORTED_CHANNELS, 774 WLAN_EID_RSN, 775 WLAN_EID_QOS_CAPA, 776 WLAN_EID_RRM_ENABLED_CAPABILITIES, 777 WLAN_EID_MOBILITY_DOMAIN, 778 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 779 WLAN_EID_RIC_DATA, /* reassoc only */ 780 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 781 }; 782 static const u8 after_ric[] = { 783 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 784 WLAN_EID_HT_CAPABILITY, 785 WLAN_EID_BSS_COEX_2040, 786 WLAN_EID_EXT_CAPABILITY, 787 WLAN_EID_QOS_TRAFFIC_CAPA, 788 WLAN_EID_TIM_BCAST_REQ, 789 WLAN_EID_INTERWORKING, 790 /* 60GHz doesn't happen right now */ 791 WLAN_EID_VHT_CAPABILITY, 792 WLAN_EID_OPMODE_NOTIF, 793 }; 794 795 noffset = ieee80211_ie_split_ric(assoc_data->ie, 796 assoc_data->ie_len, 797 before_ht, 798 ARRAY_SIZE(before_ht), 799 after_ric, 800 ARRAY_SIZE(after_ric), 801 offset); 802 pos = skb_put(skb, noffset - offset); 803 memcpy(pos, assoc_data->ie + offset, noffset - offset); 804 offset = noffset; 805 } 806 807 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 808 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 809 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 810 811 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 812 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 813 sband, chan, sdata->smps_mode); 814 815 /* if present, add any custom IEs that go before VHT */ 816 if (assoc_data->ie_len) { 817 static const u8 before_vht[] = { 818 WLAN_EID_SSID, 819 WLAN_EID_SUPP_RATES, 820 WLAN_EID_EXT_SUPP_RATES, 821 WLAN_EID_PWR_CAPABILITY, 822 WLAN_EID_SUPPORTED_CHANNELS, 823 WLAN_EID_RSN, 824 WLAN_EID_QOS_CAPA, 825 WLAN_EID_RRM_ENABLED_CAPABILITIES, 826 WLAN_EID_MOBILITY_DOMAIN, 827 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 828 WLAN_EID_HT_CAPABILITY, 829 WLAN_EID_BSS_COEX_2040, 830 WLAN_EID_EXT_CAPABILITY, 831 WLAN_EID_QOS_TRAFFIC_CAPA, 832 WLAN_EID_TIM_BCAST_REQ, 833 WLAN_EID_INTERWORKING, 834 }; 835 836 /* RIC already taken above, so no need to handle here anymore */ 837 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 838 before_vht, ARRAY_SIZE(before_vht), 839 offset); 840 pos = skb_put(skb, noffset - offset); 841 memcpy(pos, assoc_data->ie + offset, noffset - offset); 842 offset = noffset; 843 } 844 845 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 846 ieee80211_add_vht_ie(sdata, skb, sband, 847 &assoc_data->ap_vht_cap); 848 849 /* if present, add any custom non-vendor IEs that go after HT */ 850 if (assoc_data->ie_len) { 851 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 852 assoc_data->ie_len, 853 offset); 854 pos = skb_put(skb, noffset - offset); 855 memcpy(pos, assoc_data->ie + offset, noffset - offset); 856 offset = noffset; 857 } 858 859 if (assoc_data->wmm) { 860 if (assoc_data->uapsd) { 861 qos_info = ifmgd->uapsd_queues; 862 qos_info |= (ifmgd->uapsd_max_sp_len << 863 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 864 } else { 865 qos_info = 0; 866 } 867 868 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 869 } 870 871 /* add any remaining custom (i.e. vendor specific here) IEs */ 872 if (assoc_data->ie_len) { 873 noffset = assoc_data->ie_len; 874 pos = skb_put(skb, noffset - offset); 875 memcpy(pos, assoc_data->ie + offset, noffset - offset); 876 } 877 878 drv_mgd_prepare_tx(local, sdata); 879 880 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 881 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 882 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 883 IEEE80211_TX_INTFL_MLME_CONN_TX; 884 ieee80211_tx_skb(sdata, skb); 885 } 886 887 void ieee80211_send_pspoll(struct ieee80211_local *local, 888 struct ieee80211_sub_if_data *sdata) 889 { 890 struct ieee80211_pspoll *pspoll; 891 struct sk_buff *skb; 892 893 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 894 if (!skb) 895 return; 896 897 pspoll = (struct ieee80211_pspoll *) skb->data; 898 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 899 900 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 901 ieee80211_tx_skb(sdata, skb); 902 } 903 904 void ieee80211_send_nullfunc(struct ieee80211_local *local, 905 struct ieee80211_sub_if_data *sdata, 906 bool powersave) 907 { 908 struct sk_buff *skb; 909 struct ieee80211_hdr_3addr *nullfunc; 910 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 911 912 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 913 if (!skb) 914 return; 915 916 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 917 if (powersave) 918 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 919 920 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 921 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 922 923 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 924 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 925 926 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 927 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 928 929 ieee80211_tx_skb(sdata, skb); 930 } 931 932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 933 struct ieee80211_sub_if_data *sdata) 934 { 935 struct sk_buff *skb; 936 struct ieee80211_hdr *nullfunc; 937 __le16 fc; 938 939 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 940 return; 941 942 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 943 if (!skb) 944 return; 945 946 skb_reserve(skb, local->hw.extra_tx_headroom); 947 948 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 949 memset(nullfunc, 0, 30); 950 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 951 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 952 nullfunc->frame_control = fc; 953 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 954 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 955 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 956 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 957 958 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 959 ieee80211_tx_skb(sdata, skb); 960 } 961 962 /* spectrum management related things */ 963 static void ieee80211_chswitch_work(struct work_struct *work) 964 { 965 struct ieee80211_sub_if_data *sdata = 966 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 967 struct ieee80211_local *local = sdata->local; 968 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 969 int ret; 970 971 if (!ieee80211_sdata_running(sdata)) 972 return; 973 974 sdata_lock(sdata); 975 mutex_lock(&local->mtx); 976 mutex_lock(&local->chanctx_mtx); 977 978 if (!ifmgd->associated) 979 goto out; 980 981 if (!sdata->vif.csa_active) 982 goto out; 983 984 /* 985 * using reservation isn't immediate as it may be deferred until later 986 * with multi-vif. once reservation is complete it will re-schedule the 987 * work with no reserved_chanctx so verify chandef to check if it 988 * completed successfully 989 */ 990 991 if (sdata->reserved_chanctx) { 992 /* 993 * with multi-vif csa driver may call ieee80211_csa_finish() 994 * many times while waiting for other interfaces to use their 995 * reservations 996 */ 997 if (sdata->reserved_ready) 998 goto out; 999 1000 ret = ieee80211_vif_use_reserved_context(sdata); 1001 if (ret) { 1002 sdata_info(sdata, 1003 "failed to use reserved channel context, disconnecting (err=%d)\n", 1004 ret); 1005 ieee80211_queue_work(&sdata->local->hw, 1006 &ifmgd->csa_connection_drop_work); 1007 goto out; 1008 } 1009 1010 goto out; 1011 } 1012 1013 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 1014 &sdata->csa_chandef)) { 1015 sdata_info(sdata, 1016 "failed to finalize channel switch, disconnecting\n"); 1017 ieee80211_queue_work(&sdata->local->hw, 1018 &ifmgd->csa_connection_drop_work); 1019 goto out; 1020 } 1021 1022 /* XXX: shouldn't really modify cfg80211-owned data! */ 1023 ifmgd->associated->channel = sdata->csa_chandef.chan; 1024 1025 ifmgd->csa_waiting_bcn = true; 1026 1027 ieee80211_sta_reset_beacon_monitor(sdata); 1028 ieee80211_sta_reset_conn_monitor(sdata); 1029 1030 out: 1031 mutex_unlock(&local->chanctx_mtx); 1032 mutex_unlock(&local->mtx); 1033 sdata_unlock(sdata); 1034 } 1035 1036 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1037 { 1038 struct ieee80211_local *local = sdata->local; 1039 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1040 int ret; 1041 1042 sdata_assert_lock(sdata); 1043 1044 WARN_ON(!sdata->vif.csa_active); 1045 1046 if (sdata->csa_block_tx) { 1047 ieee80211_wake_vif_queues(local, sdata, 1048 IEEE80211_QUEUE_STOP_REASON_CSA); 1049 sdata->csa_block_tx = false; 1050 } 1051 1052 sdata->vif.csa_active = false; 1053 ifmgd->csa_waiting_bcn = false; 1054 1055 ret = drv_post_channel_switch(sdata); 1056 if (ret) { 1057 sdata_info(sdata, 1058 "driver post channel switch failed, disconnecting\n"); 1059 ieee80211_queue_work(&local->hw, 1060 &ifmgd->csa_connection_drop_work); 1061 return; 1062 } 1063 1064 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1065 } 1066 1067 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1068 { 1069 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1070 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1071 1072 trace_api_chswitch_done(sdata, success); 1073 if (!success) { 1074 sdata_info(sdata, 1075 "driver channel switch failed, disconnecting\n"); 1076 ieee80211_queue_work(&sdata->local->hw, 1077 &ifmgd->csa_connection_drop_work); 1078 } else { 1079 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1080 } 1081 } 1082 EXPORT_SYMBOL(ieee80211_chswitch_done); 1083 1084 static void ieee80211_chswitch_timer(unsigned long data) 1085 { 1086 struct ieee80211_sub_if_data *sdata = 1087 (struct ieee80211_sub_if_data *) data; 1088 1089 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1090 } 1091 1092 static void 1093 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1094 u64 timestamp, u32 device_timestamp, 1095 struct ieee802_11_elems *elems, 1096 bool beacon) 1097 { 1098 struct ieee80211_local *local = sdata->local; 1099 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1100 struct cfg80211_bss *cbss = ifmgd->associated; 1101 struct ieee80211_chanctx_conf *conf; 1102 struct ieee80211_chanctx *chanctx; 1103 enum nl80211_band current_band; 1104 struct ieee80211_csa_ie csa_ie; 1105 struct ieee80211_channel_switch ch_switch; 1106 int res; 1107 1108 sdata_assert_lock(sdata); 1109 1110 if (!cbss) 1111 return; 1112 1113 if (local->scanning) 1114 return; 1115 1116 /* disregard subsequent announcements if we are already processing */ 1117 if (sdata->vif.csa_active) 1118 return; 1119 1120 current_band = cbss->channel->band; 1121 memset(&csa_ie, 0, sizeof(csa_ie)); 1122 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1123 ifmgd->flags, 1124 ifmgd->associated->bssid, &csa_ie); 1125 if (res < 0) 1126 ieee80211_queue_work(&local->hw, 1127 &ifmgd->csa_connection_drop_work); 1128 if (res) 1129 return; 1130 1131 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1132 IEEE80211_CHAN_DISABLED)) { 1133 sdata_info(sdata, 1134 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1135 ifmgd->associated->bssid, 1136 csa_ie.chandef.chan->center_freq, 1137 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1138 csa_ie.chandef.center_freq2); 1139 ieee80211_queue_work(&local->hw, 1140 &ifmgd->csa_connection_drop_work); 1141 return; 1142 } 1143 1144 if (cfg80211_chandef_identical(&csa_ie.chandef, 1145 &sdata->vif.bss_conf.chandef)) { 1146 if (ifmgd->csa_ignored_same_chan) 1147 return; 1148 sdata_info(sdata, 1149 "AP %pM tries to chanswitch to same channel, ignore\n", 1150 ifmgd->associated->bssid); 1151 ifmgd->csa_ignored_same_chan = true; 1152 return; 1153 } 1154 1155 /* 1156 * Drop all TDLS peers - either we disconnect or move to a different 1157 * channel from this point on. There's no telling what our peer will do. 1158 * The TDLS WIDER_BW scenario is also problematic, as peers might now 1159 * have an incompatible wider chandef. 1160 */ 1161 ieee80211_teardown_tdls_peers(sdata); 1162 1163 mutex_lock(&local->mtx); 1164 mutex_lock(&local->chanctx_mtx); 1165 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1166 lockdep_is_held(&local->chanctx_mtx)); 1167 if (!conf) { 1168 sdata_info(sdata, 1169 "no channel context assigned to vif?, disconnecting\n"); 1170 goto drop_connection; 1171 } 1172 1173 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1174 1175 if (local->use_chanctx && 1176 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) { 1177 sdata_info(sdata, 1178 "driver doesn't support chan-switch with channel contexts\n"); 1179 goto drop_connection; 1180 } 1181 1182 ch_switch.timestamp = timestamp; 1183 ch_switch.device_timestamp = device_timestamp; 1184 ch_switch.block_tx = csa_ie.mode; 1185 ch_switch.chandef = csa_ie.chandef; 1186 ch_switch.count = csa_ie.count; 1187 1188 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1189 sdata_info(sdata, 1190 "preparing for channel switch failed, disconnecting\n"); 1191 goto drop_connection; 1192 } 1193 1194 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1195 chanctx->mode, false); 1196 if (res) { 1197 sdata_info(sdata, 1198 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1199 res); 1200 goto drop_connection; 1201 } 1202 mutex_unlock(&local->chanctx_mtx); 1203 1204 sdata->vif.csa_active = true; 1205 sdata->csa_chandef = csa_ie.chandef; 1206 sdata->csa_block_tx = csa_ie.mode; 1207 ifmgd->csa_ignored_same_chan = false; 1208 1209 if (sdata->csa_block_tx) 1210 ieee80211_stop_vif_queues(local, sdata, 1211 IEEE80211_QUEUE_STOP_REASON_CSA); 1212 mutex_unlock(&local->mtx); 1213 1214 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1215 csa_ie.count); 1216 1217 if (local->ops->channel_switch) { 1218 /* use driver's channel switch callback */ 1219 drv_channel_switch(local, sdata, &ch_switch); 1220 return; 1221 } 1222 1223 /* channel switch handled in software */ 1224 if (csa_ie.count <= 1) 1225 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1226 else 1227 mod_timer(&ifmgd->chswitch_timer, 1228 TU_TO_EXP_TIME((csa_ie.count - 1) * 1229 cbss->beacon_interval)); 1230 return; 1231 drop_connection: 1232 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); 1233 mutex_unlock(&local->chanctx_mtx); 1234 mutex_unlock(&local->mtx); 1235 } 1236 1237 static bool 1238 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1239 struct ieee80211_channel *channel, 1240 const u8 *country_ie, u8 country_ie_len, 1241 const u8 *pwr_constr_elem, 1242 int *chan_pwr, int *pwr_reduction) 1243 { 1244 struct ieee80211_country_ie_triplet *triplet; 1245 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1246 int i, chan_increment; 1247 bool have_chan_pwr = false; 1248 1249 /* Invalid IE */ 1250 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1251 return false; 1252 1253 triplet = (void *)(country_ie + 3); 1254 country_ie_len -= 3; 1255 1256 switch (channel->band) { 1257 default: 1258 WARN_ON_ONCE(1); 1259 /* fall through */ 1260 case NL80211_BAND_2GHZ: 1261 case NL80211_BAND_60GHZ: 1262 chan_increment = 1; 1263 break; 1264 case NL80211_BAND_5GHZ: 1265 chan_increment = 4; 1266 break; 1267 } 1268 1269 /* find channel */ 1270 while (country_ie_len >= 3) { 1271 u8 first_channel = triplet->chans.first_channel; 1272 1273 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1274 goto next; 1275 1276 for (i = 0; i < triplet->chans.num_channels; i++) { 1277 if (first_channel + i * chan_increment == chan) { 1278 have_chan_pwr = true; 1279 *chan_pwr = triplet->chans.max_power; 1280 break; 1281 } 1282 } 1283 if (have_chan_pwr) 1284 break; 1285 1286 next: 1287 triplet++; 1288 country_ie_len -= 3; 1289 } 1290 1291 if (have_chan_pwr && pwr_constr_elem) 1292 *pwr_reduction = *pwr_constr_elem; 1293 else 1294 *pwr_reduction = 0; 1295 1296 return have_chan_pwr; 1297 } 1298 1299 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1300 struct ieee80211_channel *channel, 1301 const u8 *cisco_dtpc_ie, 1302 int *pwr_level) 1303 { 1304 /* From practical testing, the first data byte of the DTPC element 1305 * seems to contain the requested dBm level, and the CLI on Cisco 1306 * APs clearly state the range is -127 to 127 dBm, which indicates 1307 * a signed byte, although it seemingly never actually goes negative. 1308 * The other byte seems to always be zero. 1309 */ 1310 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1311 } 1312 1313 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1314 struct ieee80211_channel *channel, 1315 struct ieee80211_mgmt *mgmt, 1316 const u8 *country_ie, u8 country_ie_len, 1317 const u8 *pwr_constr_ie, 1318 const u8 *cisco_dtpc_ie) 1319 { 1320 bool has_80211h_pwr = false, has_cisco_pwr = false; 1321 int chan_pwr = 0, pwr_reduction_80211h = 0; 1322 int pwr_level_cisco, pwr_level_80211h; 1323 int new_ap_level; 1324 __le16 capab = mgmt->u.probe_resp.capab_info; 1325 1326 if (country_ie && 1327 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1328 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1329 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1330 sdata, channel, country_ie, country_ie_len, 1331 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1332 pwr_level_80211h = 1333 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1334 } 1335 1336 if (cisco_dtpc_ie) { 1337 ieee80211_find_cisco_dtpc( 1338 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1339 has_cisco_pwr = true; 1340 } 1341 1342 if (!has_80211h_pwr && !has_cisco_pwr) 1343 return 0; 1344 1345 /* If we have both 802.11h and Cisco DTPC, apply both limits 1346 * by picking the smallest of the two power levels advertised. 1347 */ 1348 if (has_80211h_pwr && 1349 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1350 new_ap_level = pwr_level_80211h; 1351 1352 if (sdata->ap_power_level == new_ap_level) 1353 return 0; 1354 1355 sdata_dbg(sdata, 1356 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1357 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1358 sdata->u.mgd.bssid); 1359 } else { /* has_cisco_pwr is always true here. */ 1360 new_ap_level = pwr_level_cisco; 1361 1362 if (sdata->ap_power_level == new_ap_level) 1363 return 0; 1364 1365 sdata_dbg(sdata, 1366 "Limiting TX power to %d dBm as advertised by %pM\n", 1367 pwr_level_cisco, sdata->u.mgd.bssid); 1368 } 1369 1370 sdata->ap_power_level = new_ap_level; 1371 if (__ieee80211_recalc_txpower(sdata)) 1372 return BSS_CHANGED_TXPOWER; 1373 return 0; 1374 } 1375 1376 /* powersave */ 1377 static void ieee80211_enable_ps(struct ieee80211_local *local, 1378 struct ieee80211_sub_if_data *sdata) 1379 { 1380 struct ieee80211_conf *conf = &local->hw.conf; 1381 1382 /* 1383 * If we are scanning right now then the parameters will 1384 * take effect when scan finishes. 1385 */ 1386 if (local->scanning) 1387 return; 1388 1389 if (conf->dynamic_ps_timeout > 0 && 1390 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1391 mod_timer(&local->dynamic_ps_timer, jiffies + 1392 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1393 } else { 1394 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1395 ieee80211_send_nullfunc(local, sdata, true); 1396 1397 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1398 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1399 return; 1400 1401 conf->flags |= IEEE80211_CONF_PS; 1402 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1403 } 1404 } 1405 1406 static void ieee80211_change_ps(struct ieee80211_local *local) 1407 { 1408 struct ieee80211_conf *conf = &local->hw.conf; 1409 1410 if (local->ps_sdata) { 1411 ieee80211_enable_ps(local, local->ps_sdata); 1412 } else if (conf->flags & IEEE80211_CONF_PS) { 1413 conf->flags &= ~IEEE80211_CONF_PS; 1414 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1415 del_timer_sync(&local->dynamic_ps_timer); 1416 cancel_work_sync(&local->dynamic_ps_enable_work); 1417 } 1418 } 1419 1420 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1423 struct sta_info *sta = NULL; 1424 bool authorized = false; 1425 1426 if (!mgd->powersave) 1427 return false; 1428 1429 if (mgd->broken_ap) 1430 return false; 1431 1432 if (!mgd->associated) 1433 return false; 1434 1435 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1436 return false; 1437 1438 if (!mgd->have_beacon) 1439 return false; 1440 1441 rcu_read_lock(); 1442 sta = sta_info_get(sdata, mgd->bssid); 1443 if (sta) 1444 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1445 rcu_read_unlock(); 1446 1447 return authorized; 1448 } 1449 1450 /* need to hold RTNL or interface lock */ 1451 void ieee80211_recalc_ps(struct ieee80211_local *local) 1452 { 1453 struct ieee80211_sub_if_data *sdata, *found = NULL; 1454 int count = 0; 1455 int timeout; 1456 1457 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1458 local->ps_sdata = NULL; 1459 return; 1460 } 1461 1462 list_for_each_entry(sdata, &local->interfaces, list) { 1463 if (!ieee80211_sdata_running(sdata)) 1464 continue; 1465 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1466 /* If an AP vif is found, then disable PS 1467 * by setting the count to zero thereby setting 1468 * ps_sdata to NULL. 1469 */ 1470 count = 0; 1471 break; 1472 } 1473 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1474 continue; 1475 found = sdata; 1476 count++; 1477 } 1478 1479 if (count == 1 && ieee80211_powersave_allowed(found)) { 1480 u8 dtimper = found->u.mgd.dtim_period; 1481 s32 beaconint_us; 1482 1483 beaconint_us = ieee80211_tu_to_usec( 1484 found->vif.bss_conf.beacon_int); 1485 1486 timeout = local->dynamic_ps_forced_timeout; 1487 if (timeout < 0) 1488 timeout = 100; 1489 local->hw.conf.dynamic_ps_timeout = timeout; 1490 1491 /* If the TIM IE is invalid, pretend the value is 1 */ 1492 if (!dtimper) 1493 dtimper = 1; 1494 1495 local->hw.conf.ps_dtim_period = dtimper; 1496 local->ps_sdata = found; 1497 } else { 1498 local->ps_sdata = NULL; 1499 } 1500 1501 ieee80211_change_ps(local); 1502 } 1503 1504 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1505 { 1506 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1507 1508 if (sdata->vif.bss_conf.ps != ps_allowed) { 1509 sdata->vif.bss_conf.ps = ps_allowed; 1510 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1511 } 1512 } 1513 1514 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1515 { 1516 struct ieee80211_local *local = 1517 container_of(work, struct ieee80211_local, 1518 dynamic_ps_disable_work); 1519 1520 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1521 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1522 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1523 } 1524 1525 ieee80211_wake_queues_by_reason(&local->hw, 1526 IEEE80211_MAX_QUEUE_MAP, 1527 IEEE80211_QUEUE_STOP_REASON_PS, 1528 false); 1529 } 1530 1531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1532 { 1533 struct ieee80211_local *local = 1534 container_of(work, struct ieee80211_local, 1535 dynamic_ps_enable_work); 1536 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1537 struct ieee80211_if_managed *ifmgd; 1538 unsigned long flags; 1539 int q; 1540 1541 /* can only happen when PS was just disabled anyway */ 1542 if (!sdata) 1543 return; 1544 1545 ifmgd = &sdata->u.mgd; 1546 1547 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1548 return; 1549 1550 if (local->hw.conf.dynamic_ps_timeout > 0) { 1551 /* don't enter PS if TX frames are pending */ 1552 if (drv_tx_frames_pending(local)) { 1553 mod_timer(&local->dynamic_ps_timer, jiffies + 1554 msecs_to_jiffies( 1555 local->hw.conf.dynamic_ps_timeout)); 1556 return; 1557 } 1558 1559 /* 1560 * transmission can be stopped by others which leads to 1561 * dynamic_ps_timer expiry. Postpone the ps timer if it 1562 * is not the actual idle state. 1563 */ 1564 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1565 for (q = 0; q < local->hw.queues; q++) { 1566 if (local->queue_stop_reasons[q]) { 1567 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1568 flags); 1569 mod_timer(&local->dynamic_ps_timer, jiffies + 1570 msecs_to_jiffies( 1571 local->hw.conf.dynamic_ps_timeout)); 1572 return; 1573 } 1574 } 1575 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1576 } 1577 1578 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1579 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1580 if (drv_tx_frames_pending(local)) { 1581 mod_timer(&local->dynamic_ps_timer, jiffies + 1582 msecs_to_jiffies( 1583 local->hw.conf.dynamic_ps_timeout)); 1584 } else { 1585 ieee80211_send_nullfunc(local, sdata, true); 1586 /* Flush to get the tx status of nullfunc frame */ 1587 ieee80211_flush_queues(local, sdata, false); 1588 } 1589 } 1590 1591 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1592 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1593 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1594 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1595 local->hw.conf.flags |= IEEE80211_CONF_PS; 1596 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1597 } 1598 } 1599 1600 void ieee80211_dynamic_ps_timer(unsigned long data) 1601 { 1602 struct ieee80211_local *local = (void *) data; 1603 1604 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1605 } 1606 1607 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1608 { 1609 struct delayed_work *delayed_work = to_delayed_work(work); 1610 struct ieee80211_sub_if_data *sdata = 1611 container_of(delayed_work, struct ieee80211_sub_if_data, 1612 dfs_cac_timer_work); 1613 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1614 1615 mutex_lock(&sdata->local->mtx); 1616 if (sdata->wdev.cac_started) { 1617 ieee80211_vif_release_channel(sdata); 1618 cfg80211_cac_event(sdata->dev, &chandef, 1619 NL80211_RADAR_CAC_FINISHED, 1620 GFP_KERNEL); 1621 } 1622 mutex_unlock(&sdata->local->mtx); 1623 } 1624 1625 static bool 1626 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1627 { 1628 struct ieee80211_local *local = sdata->local; 1629 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1630 bool ret = false; 1631 int ac; 1632 1633 if (local->hw.queues < IEEE80211_NUM_ACS) 1634 return false; 1635 1636 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1637 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1638 int non_acm_ac; 1639 unsigned long now = jiffies; 1640 1641 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1642 tx_tspec->admitted_time && 1643 time_after(now, tx_tspec->time_slice_start + HZ)) { 1644 tx_tspec->consumed_tx_time = 0; 1645 tx_tspec->time_slice_start = now; 1646 1647 if (tx_tspec->downgraded) 1648 tx_tspec->action = 1649 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1650 } 1651 1652 switch (tx_tspec->action) { 1653 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1654 /* take the original parameters */ 1655 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1656 sdata_err(sdata, 1657 "failed to set TX queue parameters for queue %d\n", 1658 ac); 1659 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1660 tx_tspec->downgraded = false; 1661 ret = true; 1662 break; 1663 case TX_TSPEC_ACTION_DOWNGRADE: 1664 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1665 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1666 ret = true; 1667 break; 1668 } 1669 /* downgrade next lower non-ACM AC */ 1670 for (non_acm_ac = ac + 1; 1671 non_acm_ac < IEEE80211_NUM_ACS; 1672 non_acm_ac++) 1673 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1674 break; 1675 /* Usually the loop will result in using BK even if it 1676 * requires admission control, but such a configuration 1677 * makes no sense and we have to transmit somehow - the 1678 * AC selection does the same thing. 1679 * If we started out trying to downgrade from BK, then 1680 * the extra condition here might be needed. 1681 */ 1682 if (non_acm_ac >= IEEE80211_NUM_ACS) 1683 non_acm_ac = IEEE80211_AC_BK; 1684 if (drv_conf_tx(local, sdata, ac, 1685 &sdata->tx_conf[non_acm_ac])) 1686 sdata_err(sdata, 1687 "failed to set TX queue parameters for queue %d\n", 1688 ac); 1689 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1690 ret = true; 1691 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1692 tx_tspec->time_slice_start + HZ - now + 1); 1693 break; 1694 case TX_TSPEC_ACTION_NONE: 1695 /* nothing now */ 1696 break; 1697 } 1698 } 1699 1700 return ret; 1701 } 1702 1703 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1704 { 1705 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1706 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1707 } 1708 1709 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1710 { 1711 struct ieee80211_sub_if_data *sdata; 1712 1713 sdata = container_of(work, struct ieee80211_sub_if_data, 1714 u.mgd.tx_tspec_wk.work); 1715 ieee80211_sta_handle_tspec_ac_params(sdata); 1716 } 1717 1718 /* MLME */ 1719 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1720 struct ieee80211_sub_if_data *sdata, 1721 const u8 *wmm_param, size_t wmm_param_len) 1722 { 1723 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1725 size_t left; 1726 int count, ac; 1727 const u8 *pos; 1728 u8 uapsd_queues = 0; 1729 1730 if (!local->ops->conf_tx) 1731 return false; 1732 1733 if (local->hw.queues < IEEE80211_NUM_ACS) 1734 return false; 1735 1736 if (!wmm_param) 1737 return false; 1738 1739 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1740 return false; 1741 1742 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1743 uapsd_queues = ifmgd->uapsd_queues; 1744 1745 count = wmm_param[6] & 0x0f; 1746 if (count == ifmgd->wmm_last_param_set) 1747 return false; 1748 ifmgd->wmm_last_param_set = count; 1749 1750 pos = wmm_param + 8; 1751 left = wmm_param_len - 8; 1752 1753 memset(¶ms, 0, sizeof(params)); 1754 1755 sdata->wmm_acm = 0; 1756 for (; left >= 4; left -= 4, pos += 4) { 1757 int aci = (pos[0] >> 5) & 0x03; 1758 int acm = (pos[0] >> 4) & 0x01; 1759 bool uapsd = false; 1760 1761 switch (aci) { 1762 case 1: /* AC_BK */ 1763 ac = IEEE80211_AC_BK; 1764 if (acm) 1765 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1766 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1767 uapsd = true; 1768 break; 1769 case 2: /* AC_VI */ 1770 ac = IEEE80211_AC_VI; 1771 if (acm) 1772 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1774 uapsd = true; 1775 break; 1776 case 3: /* AC_VO */ 1777 ac = IEEE80211_AC_VO; 1778 if (acm) 1779 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1781 uapsd = true; 1782 break; 1783 case 0: /* AC_BE */ 1784 default: 1785 ac = IEEE80211_AC_BE; 1786 if (acm) 1787 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1788 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1789 uapsd = true; 1790 break; 1791 } 1792 1793 params[ac].aifs = pos[0] & 0x0f; 1794 1795 if (params[ac].aifs < 2) { 1796 sdata_info(sdata, 1797 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1798 params[ac].aifs, aci); 1799 params[ac].aifs = 2; 1800 } 1801 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1802 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1803 params[ac].txop = get_unaligned_le16(pos + 2); 1804 params[ac].acm = acm; 1805 params[ac].uapsd = uapsd; 1806 1807 if (params[ac].cw_min > params[ac].cw_max) { 1808 sdata_info(sdata, 1809 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1810 params[ac].cw_min, params[ac].cw_max, aci); 1811 return false; 1812 } 1813 } 1814 1815 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1816 mlme_dbg(sdata, 1817 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1818 ac, params[ac].acm, 1819 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1820 params[ac].txop, params[ac].uapsd, 1821 ifmgd->tx_tspec[ac].downgraded); 1822 sdata->tx_conf[ac] = params[ac]; 1823 if (!ifmgd->tx_tspec[ac].downgraded && 1824 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1825 sdata_err(sdata, 1826 "failed to set TX queue parameters for AC %d\n", 1827 ac); 1828 } 1829 1830 /* enable WMM or activate new settings */ 1831 sdata->vif.bss_conf.qos = true; 1832 return true; 1833 } 1834 1835 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1836 { 1837 lockdep_assert_held(&sdata->local->mtx); 1838 1839 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1840 ieee80211_run_deferred_scan(sdata->local); 1841 } 1842 1843 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1844 { 1845 mutex_lock(&sdata->local->mtx); 1846 __ieee80211_stop_poll(sdata); 1847 mutex_unlock(&sdata->local->mtx); 1848 } 1849 1850 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1851 u16 capab, bool erp_valid, u8 erp) 1852 { 1853 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1854 u32 changed = 0; 1855 bool use_protection; 1856 bool use_short_preamble; 1857 bool use_short_slot; 1858 1859 if (erp_valid) { 1860 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1861 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1862 } else { 1863 use_protection = false; 1864 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1865 } 1866 1867 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1868 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ) 1869 use_short_slot = true; 1870 1871 if (use_protection != bss_conf->use_cts_prot) { 1872 bss_conf->use_cts_prot = use_protection; 1873 changed |= BSS_CHANGED_ERP_CTS_PROT; 1874 } 1875 1876 if (use_short_preamble != bss_conf->use_short_preamble) { 1877 bss_conf->use_short_preamble = use_short_preamble; 1878 changed |= BSS_CHANGED_ERP_PREAMBLE; 1879 } 1880 1881 if (use_short_slot != bss_conf->use_short_slot) { 1882 bss_conf->use_short_slot = use_short_slot; 1883 changed |= BSS_CHANGED_ERP_SLOT; 1884 } 1885 1886 return changed; 1887 } 1888 1889 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1890 struct cfg80211_bss *cbss, 1891 u32 bss_info_changed) 1892 { 1893 struct ieee80211_bss *bss = (void *)cbss->priv; 1894 struct ieee80211_local *local = sdata->local; 1895 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1896 1897 bss_info_changed |= BSS_CHANGED_ASSOC; 1898 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1899 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1900 1901 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1902 beacon_loss_count * bss_conf->beacon_int)); 1903 1904 sdata->u.mgd.associated = cbss; 1905 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1906 1907 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1908 1909 if (sdata->vif.p2p || 1910 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1911 const struct cfg80211_bss_ies *ies; 1912 1913 rcu_read_lock(); 1914 ies = rcu_dereference(cbss->ies); 1915 if (ies) { 1916 int ret; 1917 1918 ret = cfg80211_get_p2p_attr( 1919 ies->data, ies->len, 1920 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1921 (u8 *) &bss_conf->p2p_noa_attr, 1922 sizeof(bss_conf->p2p_noa_attr)); 1923 if (ret >= 2) { 1924 sdata->u.mgd.p2p_noa_index = 1925 bss_conf->p2p_noa_attr.index; 1926 bss_info_changed |= BSS_CHANGED_P2P_PS; 1927 } 1928 } 1929 rcu_read_unlock(); 1930 } 1931 1932 /* just to be sure */ 1933 ieee80211_stop_poll(sdata); 1934 1935 ieee80211_led_assoc(local, 1); 1936 1937 if (sdata->u.mgd.have_beacon) { 1938 /* 1939 * If the AP is buggy we may get here with no DTIM period 1940 * known, so assume it's 1 which is the only safe assumption 1941 * in that case, although if the TIM IE is broken powersave 1942 * probably just won't work at all. 1943 */ 1944 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1945 bss_conf->beacon_rate = bss->beacon_rate; 1946 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1947 } else { 1948 bss_conf->beacon_rate = NULL; 1949 bss_conf->dtim_period = 0; 1950 } 1951 1952 bss_conf->assoc = 1; 1953 1954 /* Tell the driver to monitor connection quality (if supported) */ 1955 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1956 bss_conf->cqm_rssi_thold) 1957 bss_info_changed |= BSS_CHANGED_CQM; 1958 1959 /* Enable ARP filtering */ 1960 if (bss_conf->arp_addr_cnt) 1961 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1962 1963 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1964 1965 mutex_lock(&local->iflist_mtx); 1966 ieee80211_recalc_ps(local); 1967 mutex_unlock(&local->iflist_mtx); 1968 1969 ieee80211_recalc_smps(sdata); 1970 ieee80211_recalc_ps_vif(sdata); 1971 1972 netif_carrier_on(sdata->dev); 1973 } 1974 1975 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1976 u16 stype, u16 reason, bool tx, 1977 u8 *frame_buf) 1978 { 1979 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1980 struct ieee80211_local *local = sdata->local; 1981 u32 changed = 0; 1982 1983 sdata_assert_lock(sdata); 1984 1985 if (WARN_ON_ONCE(tx && !frame_buf)) 1986 return; 1987 1988 if (WARN_ON(!ifmgd->associated)) 1989 return; 1990 1991 ieee80211_stop_poll(sdata); 1992 1993 ifmgd->associated = NULL; 1994 netif_carrier_off(sdata->dev); 1995 1996 /* 1997 * if we want to get out of ps before disassoc (why?) we have 1998 * to do it before sending disassoc, as otherwise the null-packet 1999 * won't be valid. 2000 */ 2001 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2002 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2003 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2004 } 2005 local->ps_sdata = NULL; 2006 2007 /* disable per-vif ps */ 2008 ieee80211_recalc_ps_vif(sdata); 2009 2010 /* make sure ongoing transmission finishes */ 2011 synchronize_net(); 2012 2013 /* 2014 * drop any frame before deauth/disassoc, this can be data or 2015 * management frame. Since we are disconnecting, we should not 2016 * insist sending these frames which can take time and delay 2017 * the disconnection and possible the roaming. 2018 */ 2019 if (tx) 2020 ieee80211_flush_queues(local, sdata, true); 2021 2022 /* deauthenticate/disassociate now */ 2023 if (tx || frame_buf) 2024 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2025 reason, tx, frame_buf); 2026 2027 /* flush out frame - make sure the deauth was actually sent */ 2028 if (tx) 2029 ieee80211_flush_queues(local, sdata, false); 2030 2031 /* clear bssid only after building the needed mgmt frames */ 2032 eth_zero_addr(ifmgd->bssid); 2033 2034 /* remove AP and TDLS peers */ 2035 sta_info_flush(sdata); 2036 2037 /* finally reset all BSS / config parameters */ 2038 changed |= ieee80211_reset_erp_info(sdata); 2039 2040 ieee80211_led_assoc(local, 0); 2041 changed |= BSS_CHANGED_ASSOC; 2042 sdata->vif.bss_conf.assoc = false; 2043 2044 ifmgd->p2p_noa_index = -1; 2045 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2046 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2047 2048 /* on the next assoc, re-program HT/VHT parameters */ 2049 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2050 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2051 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2052 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2053 2054 /* reset MU-MIMO ownership and group data */ 2055 memset(sdata->vif.bss_conf.mu_group.membership, 0, 2056 sizeof(sdata->vif.bss_conf.mu_group.membership)); 2057 memset(sdata->vif.bss_conf.mu_group.position, 0, 2058 sizeof(sdata->vif.bss_conf.mu_group.position)); 2059 changed |= BSS_CHANGED_MU_GROUPS; 2060 sdata->vif.mu_mimo_owner = false; 2061 2062 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2063 2064 del_timer_sync(&local->dynamic_ps_timer); 2065 cancel_work_sync(&local->dynamic_ps_enable_work); 2066 2067 /* Disable ARP filtering */ 2068 if (sdata->vif.bss_conf.arp_addr_cnt) 2069 changed |= BSS_CHANGED_ARP_FILTER; 2070 2071 sdata->vif.bss_conf.qos = false; 2072 changed |= BSS_CHANGED_QOS; 2073 2074 /* The BSSID (not really interesting) and HT changed */ 2075 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2076 ieee80211_bss_info_change_notify(sdata, changed); 2077 2078 /* disassociated - set to defaults now */ 2079 ieee80211_set_wmm_default(sdata, false, false); 2080 2081 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2082 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2083 del_timer_sync(&sdata->u.mgd.timer); 2084 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2085 2086 sdata->vif.bss_conf.dtim_period = 0; 2087 sdata->vif.bss_conf.beacon_rate = NULL; 2088 2089 ifmgd->have_beacon = false; 2090 2091 ifmgd->flags = 0; 2092 mutex_lock(&local->mtx); 2093 ieee80211_vif_release_channel(sdata); 2094 2095 sdata->vif.csa_active = false; 2096 ifmgd->csa_waiting_bcn = false; 2097 ifmgd->csa_ignored_same_chan = false; 2098 if (sdata->csa_block_tx) { 2099 ieee80211_wake_vif_queues(local, sdata, 2100 IEEE80211_QUEUE_STOP_REASON_CSA); 2101 sdata->csa_block_tx = false; 2102 } 2103 mutex_unlock(&local->mtx); 2104 2105 /* existing TX TSPEC sessions no longer exist */ 2106 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2107 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2108 2109 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2110 } 2111 2112 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2113 struct ieee80211_hdr *hdr) 2114 { 2115 /* 2116 * We can postpone the mgd.timer whenever receiving unicast frames 2117 * from AP because we know that the connection is working both ways 2118 * at that time. But multicast frames (and hence also beacons) must 2119 * be ignored here, because we need to trigger the timer during 2120 * data idle periods for sending the periodic probe request to the 2121 * AP we're connected to. 2122 */ 2123 if (is_multicast_ether_addr(hdr->addr1)) 2124 return; 2125 2126 ieee80211_sta_reset_conn_monitor(sdata); 2127 } 2128 2129 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2130 { 2131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2132 struct ieee80211_local *local = sdata->local; 2133 2134 mutex_lock(&local->mtx); 2135 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2136 goto out; 2137 2138 __ieee80211_stop_poll(sdata); 2139 2140 mutex_lock(&local->iflist_mtx); 2141 ieee80211_recalc_ps(local); 2142 mutex_unlock(&local->iflist_mtx); 2143 2144 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2145 goto out; 2146 2147 /* 2148 * We've received a probe response, but are not sure whether 2149 * we have or will be receiving any beacons or data, so let's 2150 * schedule the timers again, just in case. 2151 */ 2152 ieee80211_sta_reset_beacon_monitor(sdata); 2153 2154 mod_timer(&ifmgd->conn_mon_timer, 2155 round_jiffies_up(jiffies + 2156 IEEE80211_CONNECTION_IDLE_TIME)); 2157 out: 2158 mutex_unlock(&local->mtx); 2159 } 2160 2161 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2162 struct ieee80211_hdr *hdr, 2163 u16 tx_time) 2164 { 2165 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2166 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2167 int ac = ieee80211_ac_from_tid(tid); 2168 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2169 unsigned long now = jiffies; 2170 2171 if (likely(!tx_tspec->admitted_time)) 2172 return; 2173 2174 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2175 tx_tspec->consumed_tx_time = 0; 2176 tx_tspec->time_slice_start = now; 2177 2178 if (tx_tspec->downgraded) { 2179 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2180 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2181 } 2182 } 2183 2184 if (tx_tspec->downgraded) 2185 return; 2186 2187 tx_tspec->consumed_tx_time += tx_time; 2188 2189 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2190 tx_tspec->downgraded = true; 2191 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2192 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2193 } 2194 } 2195 2196 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2197 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2198 { 2199 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2200 2201 if (!ieee80211_is_data(hdr->frame_control)) 2202 return; 2203 2204 if (ieee80211_is_nullfunc(hdr->frame_control) && 2205 sdata->u.mgd.probe_send_count > 0) { 2206 if (ack) 2207 ieee80211_sta_reset_conn_monitor(sdata); 2208 else 2209 sdata->u.mgd.nullfunc_failed = true; 2210 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2211 return; 2212 } 2213 2214 if (ack) 2215 ieee80211_sta_reset_conn_monitor(sdata); 2216 } 2217 2218 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2219 { 2220 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2221 const u8 *ssid; 2222 u8 *dst = ifmgd->associated->bssid; 2223 u8 unicast_limit = max(1, max_probe_tries - 3); 2224 struct sta_info *sta; 2225 2226 /* 2227 * Try sending broadcast probe requests for the last three 2228 * probe requests after the first ones failed since some 2229 * buggy APs only support broadcast probe requests. 2230 */ 2231 if (ifmgd->probe_send_count >= unicast_limit) 2232 dst = NULL; 2233 2234 /* 2235 * When the hardware reports an accurate Tx ACK status, it's 2236 * better to send a nullfunc frame instead of a probe request, 2237 * as it will kick us off the AP quickly if we aren't associated 2238 * anymore. The timeout will be reset if the frame is ACKed by 2239 * the AP. 2240 */ 2241 ifmgd->probe_send_count++; 2242 2243 if (dst) { 2244 mutex_lock(&sdata->local->sta_mtx); 2245 sta = sta_info_get(sdata, dst); 2246 if (!WARN_ON(!sta)) 2247 ieee80211_check_fast_rx(sta); 2248 mutex_unlock(&sdata->local->sta_mtx); 2249 } 2250 2251 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2252 ifmgd->nullfunc_failed = false; 2253 ieee80211_send_nullfunc(sdata->local, sdata, false); 2254 } else { 2255 int ssid_len; 2256 2257 rcu_read_lock(); 2258 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2259 if (WARN_ON_ONCE(ssid == NULL)) 2260 ssid_len = 0; 2261 else 2262 ssid_len = ssid[1]; 2263 2264 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2265 ssid + 2, ssid_len, NULL, 2266 0, (u32) -1, true, 0, 2267 ifmgd->associated->channel, false); 2268 rcu_read_unlock(); 2269 } 2270 2271 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2272 run_again(sdata, ifmgd->probe_timeout); 2273 } 2274 2275 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2276 bool beacon) 2277 { 2278 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2279 bool already = false; 2280 2281 if (!ieee80211_sdata_running(sdata)) 2282 return; 2283 2284 sdata_lock(sdata); 2285 2286 if (!ifmgd->associated) 2287 goto out; 2288 2289 mutex_lock(&sdata->local->mtx); 2290 2291 if (sdata->local->tmp_channel || sdata->local->scanning) { 2292 mutex_unlock(&sdata->local->mtx); 2293 goto out; 2294 } 2295 2296 if (beacon) { 2297 mlme_dbg_ratelimited(sdata, 2298 "detected beacon loss from AP (missed %d beacons) - probing\n", 2299 beacon_loss_count); 2300 2301 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2302 } 2303 2304 /* 2305 * The driver/our work has already reported this event or the 2306 * connection monitoring has kicked in and we have already sent 2307 * a probe request. Or maybe the AP died and the driver keeps 2308 * reporting until we disassociate... 2309 * 2310 * In either case we have to ignore the current call to this 2311 * function (except for setting the correct probe reason bit) 2312 * because otherwise we would reset the timer every time and 2313 * never check whether we received a probe response! 2314 */ 2315 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2316 already = true; 2317 2318 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2319 2320 mutex_unlock(&sdata->local->mtx); 2321 2322 if (already) 2323 goto out; 2324 2325 mutex_lock(&sdata->local->iflist_mtx); 2326 ieee80211_recalc_ps(sdata->local); 2327 mutex_unlock(&sdata->local->iflist_mtx); 2328 2329 ifmgd->probe_send_count = 0; 2330 ieee80211_mgd_probe_ap_send(sdata); 2331 out: 2332 sdata_unlock(sdata); 2333 } 2334 2335 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2336 struct ieee80211_vif *vif) 2337 { 2338 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2339 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2340 struct cfg80211_bss *cbss; 2341 struct sk_buff *skb; 2342 const u8 *ssid; 2343 int ssid_len; 2344 2345 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2346 return NULL; 2347 2348 sdata_assert_lock(sdata); 2349 2350 if (ifmgd->associated) 2351 cbss = ifmgd->associated; 2352 else if (ifmgd->auth_data) 2353 cbss = ifmgd->auth_data->bss; 2354 else if (ifmgd->assoc_data) 2355 cbss = ifmgd->assoc_data->bss; 2356 else 2357 return NULL; 2358 2359 rcu_read_lock(); 2360 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2361 if (WARN_ON_ONCE(ssid == NULL)) 2362 ssid_len = 0; 2363 else 2364 ssid_len = ssid[1]; 2365 2366 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2367 (u32) -1, cbss->channel, 2368 ssid + 2, ssid_len, 2369 NULL, 0, true); 2370 rcu_read_unlock(); 2371 2372 return skb; 2373 } 2374 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2375 2376 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2377 const u8 *buf, size_t len, bool tx, 2378 u16 reason) 2379 { 2380 struct ieee80211_event event = { 2381 .type = MLME_EVENT, 2382 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2383 .u.mlme.reason = reason, 2384 }; 2385 2386 if (tx) 2387 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2388 else 2389 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2390 2391 drv_event_callback(sdata->local, sdata, &event); 2392 } 2393 2394 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2395 { 2396 struct ieee80211_local *local = sdata->local; 2397 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2398 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2399 2400 sdata_lock(sdata); 2401 if (!ifmgd->associated) { 2402 sdata_unlock(sdata); 2403 return; 2404 } 2405 2406 /* AP is probably out of range (or not reachable for another reason) so 2407 * remove the bss struct for that AP. 2408 */ 2409 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated); 2410 2411 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2412 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2413 true, frame_buf); 2414 mutex_lock(&local->mtx); 2415 sdata->vif.csa_active = false; 2416 ifmgd->csa_waiting_bcn = false; 2417 if (sdata->csa_block_tx) { 2418 ieee80211_wake_vif_queues(local, sdata, 2419 IEEE80211_QUEUE_STOP_REASON_CSA); 2420 sdata->csa_block_tx = false; 2421 } 2422 mutex_unlock(&local->mtx); 2423 2424 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2425 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2426 2427 sdata_unlock(sdata); 2428 } 2429 2430 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2431 { 2432 struct ieee80211_sub_if_data *sdata = 2433 container_of(work, struct ieee80211_sub_if_data, 2434 u.mgd.beacon_connection_loss_work); 2435 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2436 2437 if (ifmgd->associated) 2438 ifmgd->beacon_loss_count++; 2439 2440 if (ifmgd->connection_loss) { 2441 sdata_info(sdata, "Connection to AP %pM lost\n", 2442 ifmgd->bssid); 2443 __ieee80211_disconnect(sdata); 2444 } else { 2445 ieee80211_mgd_probe_ap(sdata, true); 2446 } 2447 } 2448 2449 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2450 { 2451 struct ieee80211_sub_if_data *sdata = 2452 container_of(work, struct ieee80211_sub_if_data, 2453 u.mgd.csa_connection_drop_work); 2454 2455 __ieee80211_disconnect(sdata); 2456 } 2457 2458 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2459 { 2460 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2461 struct ieee80211_hw *hw = &sdata->local->hw; 2462 2463 trace_api_beacon_loss(sdata); 2464 2465 sdata->u.mgd.connection_loss = false; 2466 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2467 } 2468 EXPORT_SYMBOL(ieee80211_beacon_loss); 2469 2470 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2471 { 2472 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2473 struct ieee80211_hw *hw = &sdata->local->hw; 2474 2475 trace_api_connection_loss(sdata); 2476 2477 sdata->u.mgd.connection_loss = true; 2478 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2479 } 2480 EXPORT_SYMBOL(ieee80211_connection_loss); 2481 2482 2483 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2484 bool assoc) 2485 { 2486 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2487 2488 sdata_assert_lock(sdata); 2489 2490 if (!assoc) { 2491 /* 2492 * we are not authenticated yet, the only timer that could be 2493 * running is the timeout for the authentication response which 2494 * which is not relevant anymore. 2495 */ 2496 del_timer_sync(&sdata->u.mgd.timer); 2497 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2498 2499 eth_zero_addr(sdata->u.mgd.bssid); 2500 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2501 sdata->u.mgd.flags = 0; 2502 mutex_lock(&sdata->local->mtx); 2503 ieee80211_vif_release_channel(sdata); 2504 mutex_unlock(&sdata->local->mtx); 2505 } 2506 2507 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2508 kfree(auth_data); 2509 sdata->u.mgd.auth_data = NULL; 2510 } 2511 2512 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2513 bool assoc) 2514 { 2515 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2516 2517 sdata_assert_lock(sdata); 2518 2519 if (!assoc) { 2520 /* 2521 * we are not associated yet, the only timer that could be 2522 * running is the timeout for the association response which 2523 * which is not relevant anymore. 2524 */ 2525 del_timer_sync(&sdata->u.mgd.timer); 2526 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2527 2528 eth_zero_addr(sdata->u.mgd.bssid); 2529 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2530 sdata->u.mgd.flags = 0; 2531 sdata->vif.mu_mimo_owner = false; 2532 2533 mutex_lock(&sdata->local->mtx); 2534 ieee80211_vif_release_channel(sdata); 2535 mutex_unlock(&sdata->local->mtx); 2536 } 2537 2538 kfree(assoc_data); 2539 sdata->u.mgd.assoc_data = NULL; 2540 } 2541 2542 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2543 struct ieee80211_mgmt *mgmt, size_t len) 2544 { 2545 struct ieee80211_local *local = sdata->local; 2546 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2547 u8 *pos; 2548 struct ieee802_11_elems elems; 2549 u32 tx_flags = 0; 2550 2551 pos = mgmt->u.auth.variable; 2552 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2553 if (!elems.challenge) 2554 return; 2555 auth_data->expected_transaction = 4; 2556 drv_mgd_prepare_tx(sdata->local, sdata); 2557 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2558 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2559 IEEE80211_TX_INTFL_MLME_CONN_TX; 2560 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2561 elems.challenge - 2, elems.challenge_len + 2, 2562 auth_data->bss->bssid, auth_data->bss->bssid, 2563 auth_data->key, auth_data->key_len, 2564 auth_data->key_idx, tx_flags); 2565 } 2566 2567 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2568 struct ieee80211_mgmt *mgmt, size_t len) 2569 { 2570 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2571 u8 bssid[ETH_ALEN]; 2572 u16 auth_alg, auth_transaction, status_code; 2573 struct sta_info *sta; 2574 struct ieee80211_event event = { 2575 .type = MLME_EVENT, 2576 .u.mlme.data = AUTH_EVENT, 2577 }; 2578 2579 sdata_assert_lock(sdata); 2580 2581 if (len < 24 + 6) 2582 return; 2583 2584 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2585 return; 2586 2587 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2588 2589 if (!ether_addr_equal(bssid, mgmt->bssid)) 2590 return; 2591 2592 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2593 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2594 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2595 2596 if (auth_alg != ifmgd->auth_data->algorithm || 2597 auth_transaction != ifmgd->auth_data->expected_transaction) { 2598 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2599 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2600 auth_transaction, 2601 ifmgd->auth_data->expected_transaction); 2602 return; 2603 } 2604 2605 if (status_code != WLAN_STATUS_SUCCESS) { 2606 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2607 mgmt->sa, status_code); 2608 ieee80211_destroy_auth_data(sdata, false); 2609 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2610 event.u.mlme.status = MLME_DENIED; 2611 event.u.mlme.reason = status_code; 2612 drv_event_callback(sdata->local, sdata, &event); 2613 return; 2614 } 2615 2616 switch (ifmgd->auth_data->algorithm) { 2617 case WLAN_AUTH_OPEN: 2618 case WLAN_AUTH_LEAP: 2619 case WLAN_AUTH_FT: 2620 case WLAN_AUTH_SAE: 2621 break; 2622 case WLAN_AUTH_SHARED_KEY: 2623 if (ifmgd->auth_data->expected_transaction != 4) { 2624 ieee80211_auth_challenge(sdata, mgmt, len); 2625 /* need another frame */ 2626 return; 2627 } 2628 break; 2629 default: 2630 WARN_ONCE(1, "invalid auth alg %d", 2631 ifmgd->auth_data->algorithm); 2632 return; 2633 } 2634 2635 event.u.mlme.status = MLME_SUCCESS; 2636 drv_event_callback(sdata->local, sdata, &event); 2637 sdata_info(sdata, "authenticated\n"); 2638 ifmgd->auth_data->done = true; 2639 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2640 ifmgd->auth_data->timeout_started = true; 2641 run_again(sdata, ifmgd->auth_data->timeout); 2642 2643 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2644 ifmgd->auth_data->expected_transaction != 2) { 2645 /* 2646 * Report auth frame to user space for processing since another 2647 * round of Authentication frames is still needed. 2648 */ 2649 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2650 return; 2651 } 2652 2653 /* move station state to auth */ 2654 mutex_lock(&sdata->local->sta_mtx); 2655 sta = sta_info_get(sdata, bssid); 2656 if (!sta) { 2657 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2658 goto out_err; 2659 } 2660 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2661 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2662 goto out_err; 2663 } 2664 mutex_unlock(&sdata->local->sta_mtx); 2665 2666 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2667 return; 2668 out_err: 2669 mutex_unlock(&sdata->local->sta_mtx); 2670 /* ignore frame -- wait for timeout */ 2671 } 2672 2673 #define case_WLAN(type) \ 2674 case WLAN_REASON_##type: return #type 2675 2676 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2677 { 2678 switch (reason_code) { 2679 case_WLAN(UNSPECIFIED); 2680 case_WLAN(PREV_AUTH_NOT_VALID); 2681 case_WLAN(DEAUTH_LEAVING); 2682 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2683 case_WLAN(DISASSOC_AP_BUSY); 2684 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2685 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2686 case_WLAN(DISASSOC_STA_HAS_LEFT); 2687 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2688 case_WLAN(DISASSOC_BAD_POWER); 2689 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2690 case_WLAN(INVALID_IE); 2691 case_WLAN(MIC_FAILURE); 2692 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2693 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2694 case_WLAN(IE_DIFFERENT); 2695 case_WLAN(INVALID_GROUP_CIPHER); 2696 case_WLAN(INVALID_PAIRWISE_CIPHER); 2697 case_WLAN(INVALID_AKMP); 2698 case_WLAN(UNSUPP_RSN_VERSION); 2699 case_WLAN(INVALID_RSN_IE_CAP); 2700 case_WLAN(IEEE8021X_FAILED); 2701 case_WLAN(CIPHER_SUITE_REJECTED); 2702 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2703 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2704 case_WLAN(DISASSOC_LOW_ACK); 2705 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2706 case_WLAN(QSTA_LEAVE_QBSS); 2707 case_WLAN(QSTA_NOT_USE); 2708 case_WLAN(QSTA_REQUIRE_SETUP); 2709 case_WLAN(QSTA_TIMEOUT); 2710 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2711 case_WLAN(MESH_PEER_CANCELED); 2712 case_WLAN(MESH_MAX_PEERS); 2713 case_WLAN(MESH_CONFIG); 2714 case_WLAN(MESH_CLOSE); 2715 case_WLAN(MESH_MAX_RETRIES); 2716 case_WLAN(MESH_CONFIRM_TIMEOUT); 2717 case_WLAN(MESH_INVALID_GTK); 2718 case_WLAN(MESH_INCONSISTENT_PARAM); 2719 case_WLAN(MESH_INVALID_SECURITY); 2720 case_WLAN(MESH_PATH_ERROR); 2721 case_WLAN(MESH_PATH_NOFORWARD); 2722 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2723 case_WLAN(MAC_EXISTS_IN_MBSS); 2724 case_WLAN(MESH_CHAN_REGULATORY); 2725 case_WLAN(MESH_CHAN); 2726 default: return "<unknown>"; 2727 } 2728 } 2729 2730 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2731 struct ieee80211_mgmt *mgmt, size_t len) 2732 { 2733 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2734 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2735 2736 sdata_assert_lock(sdata); 2737 2738 if (len < 24 + 2) 2739 return; 2740 2741 if (ifmgd->associated && 2742 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2743 const u8 *bssid = ifmgd->associated->bssid; 2744 2745 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2746 bssid, reason_code, 2747 ieee80211_get_reason_code_string(reason_code)); 2748 2749 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2750 2751 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2752 reason_code); 2753 return; 2754 } 2755 2756 if (ifmgd->assoc_data && 2757 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2758 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2759 2760 sdata_info(sdata, 2761 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2762 bssid, reason_code, 2763 ieee80211_get_reason_code_string(reason_code)); 2764 2765 ieee80211_destroy_assoc_data(sdata, false); 2766 2767 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2768 return; 2769 } 2770 } 2771 2772 2773 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2774 struct ieee80211_mgmt *mgmt, size_t len) 2775 { 2776 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2777 u16 reason_code; 2778 2779 sdata_assert_lock(sdata); 2780 2781 if (len < 24 + 2) 2782 return; 2783 2784 if (!ifmgd->associated || 2785 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2786 return; 2787 2788 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2789 2790 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2791 mgmt->sa, reason_code); 2792 2793 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2794 2795 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2796 } 2797 2798 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2799 u8 *supp_rates, unsigned int supp_rates_len, 2800 u32 *rates, u32 *basic_rates, 2801 bool *have_higher_than_11mbit, 2802 int *min_rate, int *min_rate_index, 2803 int shift, u32 rate_flags) 2804 { 2805 int i, j; 2806 2807 for (i = 0; i < supp_rates_len; i++) { 2808 int rate = supp_rates[i] & 0x7f; 2809 bool is_basic = !!(supp_rates[i] & 0x80); 2810 2811 if ((rate * 5 * (1 << shift)) > 110) 2812 *have_higher_than_11mbit = true; 2813 2814 /* 2815 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2816 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2817 * 2818 * Note: Even through the membership selector and the basic 2819 * rate flag share the same bit, they are not exactly 2820 * the same. 2821 */ 2822 if (!!(supp_rates[i] & 0x80) && 2823 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2824 continue; 2825 2826 for (j = 0; j < sband->n_bitrates; j++) { 2827 struct ieee80211_rate *br; 2828 int brate; 2829 2830 br = &sband->bitrates[j]; 2831 if ((rate_flags & br->flags) != rate_flags) 2832 continue; 2833 2834 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2835 if (brate == rate) { 2836 *rates |= BIT(j); 2837 if (is_basic) 2838 *basic_rates |= BIT(j); 2839 if ((rate * 5) < *min_rate) { 2840 *min_rate = rate * 5; 2841 *min_rate_index = j; 2842 } 2843 break; 2844 } 2845 } 2846 } 2847 } 2848 2849 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2850 struct cfg80211_bss *cbss, 2851 struct ieee80211_mgmt *mgmt, size_t len) 2852 { 2853 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2854 struct ieee80211_local *local = sdata->local; 2855 struct ieee80211_supported_band *sband; 2856 struct sta_info *sta; 2857 u8 *pos; 2858 u16 capab_info, aid; 2859 struct ieee802_11_elems elems; 2860 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2861 const struct cfg80211_bss_ies *bss_ies = NULL; 2862 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2863 u32 changed = 0; 2864 int err; 2865 bool ret; 2866 2867 /* AssocResp and ReassocResp have identical structure */ 2868 2869 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2870 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2871 2872 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2873 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2874 aid); 2875 aid &= ~(BIT(15) | BIT(14)); 2876 2877 ifmgd->broken_ap = false; 2878 2879 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2880 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2881 aid); 2882 aid = 0; 2883 ifmgd->broken_ap = true; 2884 } 2885 2886 pos = mgmt->u.assoc_resp.variable; 2887 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2888 2889 if (!elems.supp_rates) { 2890 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2891 return false; 2892 } 2893 2894 ifmgd->aid = aid; 2895 ifmgd->tdls_chan_switch_prohibited = 2896 elems.ext_capab && elems.ext_capab_len >= 5 && 2897 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2898 2899 /* 2900 * Some APs are erroneously not including some information in their 2901 * (re)association response frames. Try to recover by using the data 2902 * from the beacon or probe response. This seems to afflict mobile 2903 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2904 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2905 */ 2906 if ((assoc_data->wmm && !elems.wmm_param) || 2907 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2908 (!elems.ht_cap_elem || !elems.ht_operation)) || 2909 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2910 (!elems.vht_cap_elem || !elems.vht_operation))) { 2911 const struct cfg80211_bss_ies *ies; 2912 struct ieee802_11_elems bss_elems; 2913 2914 rcu_read_lock(); 2915 ies = rcu_dereference(cbss->ies); 2916 if (ies) 2917 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2918 GFP_ATOMIC); 2919 rcu_read_unlock(); 2920 if (!bss_ies) 2921 return false; 2922 2923 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2924 false, &bss_elems); 2925 if (assoc_data->wmm && 2926 !elems.wmm_param && bss_elems.wmm_param) { 2927 elems.wmm_param = bss_elems.wmm_param; 2928 sdata_info(sdata, 2929 "AP bug: WMM param missing from AssocResp\n"); 2930 } 2931 2932 /* 2933 * Also check if we requested HT/VHT, otherwise the AP doesn't 2934 * have to include the IEs in the (re)association response. 2935 */ 2936 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2937 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2938 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2939 sdata_info(sdata, 2940 "AP bug: HT capability missing from AssocResp\n"); 2941 } 2942 if (!elems.ht_operation && bss_elems.ht_operation && 2943 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2944 elems.ht_operation = bss_elems.ht_operation; 2945 sdata_info(sdata, 2946 "AP bug: HT operation missing from AssocResp\n"); 2947 } 2948 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2949 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2950 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2951 sdata_info(sdata, 2952 "AP bug: VHT capa missing from AssocResp\n"); 2953 } 2954 if (!elems.vht_operation && bss_elems.vht_operation && 2955 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2956 elems.vht_operation = bss_elems.vht_operation; 2957 sdata_info(sdata, 2958 "AP bug: VHT operation missing from AssocResp\n"); 2959 } 2960 } 2961 2962 /* 2963 * We previously checked these in the beacon/probe response, so 2964 * they should be present here. This is just a safety net. 2965 */ 2966 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2967 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2968 sdata_info(sdata, 2969 "HT AP is missing WMM params or HT capability/operation\n"); 2970 ret = false; 2971 goto out; 2972 } 2973 2974 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2975 (!elems.vht_cap_elem || !elems.vht_operation)) { 2976 sdata_info(sdata, 2977 "VHT AP is missing VHT capability/operation\n"); 2978 ret = false; 2979 goto out; 2980 } 2981 2982 mutex_lock(&sdata->local->sta_mtx); 2983 /* 2984 * station info was already allocated and inserted before 2985 * the association and should be available to us 2986 */ 2987 sta = sta_info_get(sdata, cbss->bssid); 2988 if (WARN_ON(!sta)) { 2989 mutex_unlock(&sdata->local->sta_mtx); 2990 ret = false; 2991 goto out; 2992 } 2993 2994 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2995 2996 /* Set up internal HT/VHT capabilities */ 2997 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2998 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2999 elems.ht_cap_elem, sta); 3000 3001 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 3002 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 3003 elems.vht_cap_elem, sta); 3004 3005 /* 3006 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3007 * in their association response, so ignore that data for our own 3008 * configuration. If it changed since the last beacon, we'll get the 3009 * next beacon and update then. 3010 */ 3011 3012 /* 3013 * If an operating mode notification IE is present, override the 3014 * NSS calculation (that would be done in rate_control_rate_init()) 3015 * and use the # of streams from that element. 3016 */ 3017 if (elems.opmode_notif && 3018 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3019 u8 nss; 3020 3021 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3022 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3023 nss += 1; 3024 sta->sta.rx_nss = nss; 3025 } 3026 3027 rate_control_rate_init(sta); 3028 3029 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3030 set_sta_flag(sta, WLAN_STA_MFP); 3031 sta->sta.mfp = true; 3032 } else { 3033 sta->sta.mfp = false; 3034 } 3035 3036 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3037 3038 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3039 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3040 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3041 if (err) { 3042 sdata_info(sdata, 3043 "failed to move station %pM to desired state\n", 3044 sta->sta.addr); 3045 WARN_ON(__sta_info_destroy(sta)); 3046 mutex_unlock(&sdata->local->sta_mtx); 3047 ret = false; 3048 goto out; 3049 } 3050 3051 mutex_unlock(&sdata->local->sta_mtx); 3052 3053 /* 3054 * Always handle WMM once after association regardless 3055 * of the first value the AP uses. Setting -1 here has 3056 * that effect because the AP values is an unsigned 3057 * 4-bit value. 3058 */ 3059 ifmgd->wmm_last_param_set = -1; 3060 3061 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3062 ieee80211_set_wmm_default(sdata, false, false); 3063 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3064 elems.wmm_param_len)) { 3065 /* still enable QoS since we might have HT/VHT */ 3066 ieee80211_set_wmm_default(sdata, false, true); 3067 /* set the disable-WMM flag in this case to disable 3068 * tracking WMM parameter changes in the beacon if 3069 * the parameters weren't actually valid. Doing so 3070 * avoids changing parameters very strangely when 3071 * the AP is going back and forth between valid and 3072 * invalid parameters. 3073 */ 3074 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3075 } 3076 changed |= BSS_CHANGED_QOS; 3077 3078 /* set AID and assoc capability, 3079 * ieee80211_set_associated() will tell the driver */ 3080 bss_conf->aid = aid; 3081 bss_conf->assoc_capability = capab_info; 3082 ieee80211_set_associated(sdata, cbss, changed); 3083 3084 /* 3085 * If we're using 4-addr mode, let the AP know that we're 3086 * doing so, so that it can create the STA VLAN on its side 3087 */ 3088 if (ifmgd->use_4addr) 3089 ieee80211_send_4addr_nullfunc(local, sdata); 3090 3091 /* 3092 * Start timer to probe the connection to the AP now. 3093 * Also start the timer that will detect beacon loss. 3094 */ 3095 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3096 ieee80211_sta_reset_beacon_monitor(sdata); 3097 3098 ret = true; 3099 out: 3100 kfree(bss_ies); 3101 return ret; 3102 } 3103 3104 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3105 struct ieee80211_mgmt *mgmt, 3106 size_t len) 3107 { 3108 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3109 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3110 u16 capab_info, status_code, aid; 3111 struct ieee802_11_elems elems; 3112 int ac, uapsd_queues = -1; 3113 u8 *pos; 3114 bool reassoc; 3115 struct cfg80211_bss *bss; 3116 struct ieee80211_event event = { 3117 .type = MLME_EVENT, 3118 .u.mlme.data = ASSOC_EVENT, 3119 }; 3120 3121 sdata_assert_lock(sdata); 3122 3123 if (!assoc_data) 3124 return; 3125 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3126 return; 3127 3128 /* 3129 * AssocResp and ReassocResp have identical structure, so process both 3130 * of them in this function. 3131 */ 3132 3133 if (len < 24 + 6) 3134 return; 3135 3136 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3137 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3138 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3139 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3140 3141 sdata_info(sdata, 3142 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3143 reassoc ? "Rea" : "A", mgmt->sa, 3144 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3145 3146 pos = mgmt->u.assoc_resp.variable; 3147 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3148 3149 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3150 elems.timeout_int && 3151 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3152 u32 tu, ms; 3153 tu = le32_to_cpu(elems.timeout_int->value); 3154 ms = tu * 1024 / 1000; 3155 sdata_info(sdata, 3156 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3157 mgmt->sa, tu, ms); 3158 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3159 assoc_data->timeout_started = true; 3160 if (ms > IEEE80211_ASSOC_TIMEOUT) 3161 run_again(sdata, assoc_data->timeout); 3162 return; 3163 } 3164 3165 bss = assoc_data->bss; 3166 3167 if (status_code != WLAN_STATUS_SUCCESS) { 3168 sdata_info(sdata, "%pM denied association (code=%d)\n", 3169 mgmt->sa, status_code); 3170 ieee80211_destroy_assoc_data(sdata, false); 3171 event.u.mlme.status = MLME_DENIED; 3172 event.u.mlme.reason = status_code; 3173 drv_event_callback(sdata->local, sdata, &event); 3174 } else { 3175 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3176 /* oops -- internal error -- send timeout for now */ 3177 ieee80211_destroy_assoc_data(sdata, false); 3178 cfg80211_assoc_timeout(sdata->dev, bss); 3179 return; 3180 } 3181 event.u.mlme.status = MLME_SUCCESS; 3182 drv_event_callback(sdata->local, sdata, &event); 3183 sdata_info(sdata, "associated\n"); 3184 3185 /* 3186 * destroy assoc_data afterwards, as otherwise an idle 3187 * recalc after assoc_data is NULL but before associated 3188 * is set can cause the interface to go idle 3189 */ 3190 ieee80211_destroy_assoc_data(sdata, true); 3191 3192 /* get uapsd queues configuration */ 3193 uapsd_queues = 0; 3194 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3195 if (sdata->tx_conf[ac].uapsd) 3196 uapsd_queues |= BIT(ac); 3197 } 3198 3199 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3200 } 3201 3202 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3203 struct ieee80211_mgmt *mgmt, size_t len, 3204 struct ieee80211_rx_status *rx_status, 3205 struct ieee802_11_elems *elems) 3206 { 3207 struct ieee80211_local *local = sdata->local; 3208 struct ieee80211_bss *bss; 3209 struct ieee80211_channel *channel; 3210 3211 sdata_assert_lock(sdata); 3212 3213 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3214 if (!channel) 3215 return; 3216 3217 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3218 channel); 3219 if (bss) { 3220 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3221 ieee80211_rx_bss_put(local, bss); 3222 } 3223 } 3224 3225 3226 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3227 struct sk_buff *skb) 3228 { 3229 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3230 struct ieee80211_if_managed *ifmgd; 3231 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3232 size_t baselen, len = skb->len; 3233 struct ieee802_11_elems elems; 3234 3235 ifmgd = &sdata->u.mgd; 3236 3237 sdata_assert_lock(sdata); 3238 3239 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3240 return; /* ignore ProbeResp to foreign address */ 3241 3242 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3243 if (baselen > len) 3244 return; 3245 3246 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3247 false, &elems); 3248 3249 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3250 3251 if (ifmgd->associated && 3252 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3253 ieee80211_reset_ap_probe(sdata); 3254 } 3255 3256 /* 3257 * This is the canonical list of information elements we care about, 3258 * the filter code also gives us all changes to the Microsoft OUI 3259 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3260 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3261 * changes to requested client power. 3262 * 3263 * We implement beacon filtering in software since that means we can 3264 * avoid processing the frame here and in cfg80211, and userspace 3265 * will not be able to tell whether the hardware supports it or not. 3266 * 3267 * XXX: This list needs to be dynamic -- userspace needs to be able to 3268 * add items it requires. It also needs to be able to tell us to 3269 * look out for other vendor IEs. 3270 */ 3271 static const u64 care_about_ies = 3272 (1ULL << WLAN_EID_COUNTRY) | 3273 (1ULL << WLAN_EID_ERP_INFO) | 3274 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3275 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3276 (1ULL << WLAN_EID_HT_CAPABILITY) | 3277 (1ULL << WLAN_EID_HT_OPERATION) | 3278 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3279 3280 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3281 struct ieee80211_mgmt *mgmt, size_t len, 3282 struct ieee80211_rx_status *rx_status) 3283 { 3284 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3285 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3286 size_t baselen; 3287 struct ieee802_11_elems elems; 3288 struct ieee80211_local *local = sdata->local; 3289 struct ieee80211_chanctx_conf *chanctx_conf; 3290 struct ieee80211_channel *chan; 3291 struct sta_info *sta; 3292 u32 changed = 0; 3293 bool erp_valid; 3294 u8 erp_value = 0; 3295 u32 ncrc; 3296 u8 *bssid; 3297 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3298 3299 sdata_assert_lock(sdata); 3300 3301 /* Process beacon from the current BSS */ 3302 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3303 if (baselen > len) 3304 return; 3305 3306 rcu_read_lock(); 3307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3308 if (!chanctx_conf) { 3309 rcu_read_unlock(); 3310 return; 3311 } 3312 3313 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3314 rcu_read_unlock(); 3315 return; 3316 } 3317 chan = chanctx_conf->def.chan; 3318 rcu_read_unlock(); 3319 3320 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3321 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3322 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3323 len - baselen, false, &elems); 3324 3325 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3326 if (elems.tim && !elems.parse_error) { 3327 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3328 ifmgd->dtim_period = tim_ie->dtim_period; 3329 } 3330 ifmgd->have_beacon = true; 3331 ifmgd->assoc_data->need_beacon = false; 3332 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3333 sdata->vif.bss_conf.sync_tsf = 3334 le64_to_cpu(mgmt->u.beacon.timestamp); 3335 sdata->vif.bss_conf.sync_device_ts = 3336 rx_status->device_timestamp; 3337 if (elems.tim) 3338 sdata->vif.bss_conf.sync_dtim_count = 3339 elems.tim->dtim_count; 3340 else 3341 sdata->vif.bss_conf.sync_dtim_count = 0; 3342 } 3343 /* continue assoc process */ 3344 ifmgd->assoc_data->timeout = jiffies; 3345 ifmgd->assoc_data->timeout_started = true; 3346 run_again(sdata, ifmgd->assoc_data->timeout); 3347 return; 3348 } 3349 3350 if (!ifmgd->associated || 3351 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3352 return; 3353 bssid = ifmgd->associated->bssid; 3354 3355 /* Track average RSSI from the Beacon frames of the current AP */ 3356 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3357 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3358 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3359 ifmgd->last_cqm_event_signal = 0; 3360 ifmgd->count_beacon_signal = 1; 3361 ifmgd->last_ave_beacon_signal = 0; 3362 } else { 3363 ifmgd->count_beacon_signal++; 3364 } 3365 3366 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3367 3368 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3369 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3370 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3371 int last_sig = ifmgd->last_ave_beacon_signal; 3372 struct ieee80211_event event = { 3373 .type = RSSI_EVENT, 3374 }; 3375 3376 /* 3377 * if signal crosses either of the boundaries, invoke callback 3378 * with appropriate parameters 3379 */ 3380 if (sig > ifmgd->rssi_max_thold && 3381 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3382 ifmgd->last_ave_beacon_signal = sig; 3383 event.u.rssi.data = RSSI_EVENT_HIGH; 3384 drv_event_callback(local, sdata, &event); 3385 } else if (sig < ifmgd->rssi_min_thold && 3386 (last_sig >= ifmgd->rssi_max_thold || 3387 last_sig == 0)) { 3388 ifmgd->last_ave_beacon_signal = sig; 3389 event.u.rssi.data = RSSI_EVENT_LOW; 3390 drv_event_callback(local, sdata, &event); 3391 } 3392 } 3393 3394 if (bss_conf->cqm_rssi_thold && 3395 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3396 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3397 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3398 int last_event = ifmgd->last_cqm_event_signal; 3399 int thold = bss_conf->cqm_rssi_thold; 3400 int hyst = bss_conf->cqm_rssi_hyst; 3401 3402 if (sig < thold && 3403 (last_event == 0 || sig < last_event - hyst)) { 3404 ifmgd->last_cqm_event_signal = sig; 3405 ieee80211_cqm_rssi_notify( 3406 &sdata->vif, 3407 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3408 GFP_KERNEL); 3409 } else if (sig > thold && 3410 (last_event == 0 || sig > last_event + hyst)) { 3411 ifmgd->last_cqm_event_signal = sig; 3412 ieee80211_cqm_rssi_notify( 3413 &sdata->vif, 3414 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3415 GFP_KERNEL); 3416 } 3417 } 3418 3419 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3420 mlme_dbg_ratelimited(sdata, 3421 "cancelling AP probe due to a received beacon\n"); 3422 ieee80211_reset_ap_probe(sdata); 3423 } 3424 3425 /* 3426 * Push the beacon loss detection into the future since 3427 * we are processing a beacon from the AP just now. 3428 */ 3429 ieee80211_sta_reset_beacon_monitor(sdata); 3430 3431 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3432 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3433 len - baselen, false, &elems, 3434 care_about_ies, ncrc); 3435 3436 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3437 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3438 if (local->hw.conf.dynamic_ps_timeout > 0) { 3439 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3440 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3441 ieee80211_hw_config(local, 3442 IEEE80211_CONF_CHANGE_PS); 3443 } 3444 ieee80211_send_nullfunc(local, sdata, false); 3445 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3446 local->pspolling = true; 3447 3448 /* 3449 * Here is assumed that the driver will be 3450 * able to send ps-poll frame and receive a 3451 * response even though power save mode is 3452 * enabled, but some drivers might require 3453 * to disable power save here. This needs 3454 * to be investigated. 3455 */ 3456 ieee80211_send_pspoll(local, sdata); 3457 } 3458 } 3459 3460 if (sdata->vif.p2p || 3461 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3462 struct ieee80211_p2p_noa_attr noa = {}; 3463 int ret; 3464 3465 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3466 len - baselen, 3467 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3468 (u8 *) &noa, sizeof(noa)); 3469 if (ret >= 2) { 3470 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3471 /* valid noa_attr and index changed */ 3472 sdata->u.mgd.p2p_noa_index = noa.index; 3473 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3474 changed |= BSS_CHANGED_P2P_PS; 3475 /* 3476 * make sure we update all information, the CRC 3477 * mechanism doesn't look at P2P attributes. 3478 */ 3479 ifmgd->beacon_crc_valid = false; 3480 } 3481 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3482 /* noa_attr not found and we had valid noa_attr before */ 3483 sdata->u.mgd.p2p_noa_index = -1; 3484 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3485 changed |= BSS_CHANGED_P2P_PS; 3486 ifmgd->beacon_crc_valid = false; 3487 } 3488 } 3489 3490 if (ifmgd->csa_waiting_bcn) 3491 ieee80211_chswitch_post_beacon(sdata); 3492 3493 /* 3494 * Update beacon timing and dtim count on every beacon appearance. This 3495 * will allow the driver to use the most updated values. Do it before 3496 * comparing this one with last received beacon. 3497 * IMPORTANT: These parameters would possibly be out of sync by the time 3498 * the driver will use them. The synchronized view is currently 3499 * guaranteed only in certain callbacks. 3500 */ 3501 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3502 sdata->vif.bss_conf.sync_tsf = 3503 le64_to_cpu(mgmt->u.beacon.timestamp); 3504 sdata->vif.bss_conf.sync_device_ts = 3505 rx_status->device_timestamp; 3506 if (elems.tim) 3507 sdata->vif.bss_conf.sync_dtim_count = 3508 elems.tim->dtim_count; 3509 else 3510 sdata->vif.bss_conf.sync_dtim_count = 0; 3511 } 3512 3513 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3514 return; 3515 ifmgd->beacon_crc = ncrc; 3516 ifmgd->beacon_crc_valid = true; 3517 3518 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3519 3520 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3521 rx_status->device_timestamp, 3522 &elems, true); 3523 3524 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3525 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3526 elems.wmm_param_len)) 3527 changed |= BSS_CHANGED_QOS; 3528 3529 /* 3530 * If we haven't had a beacon before, tell the driver about the 3531 * DTIM period (and beacon timing if desired) now. 3532 */ 3533 if (!ifmgd->have_beacon) { 3534 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3535 if (elems.tim) 3536 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3537 else 3538 bss_conf->dtim_period = 1; 3539 3540 changed |= BSS_CHANGED_BEACON_INFO; 3541 ifmgd->have_beacon = true; 3542 3543 mutex_lock(&local->iflist_mtx); 3544 ieee80211_recalc_ps(local); 3545 mutex_unlock(&local->iflist_mtx); 3546 3547 ieee80211_recalc_ps_vif(sdata); 3548 } 3549 3550 if (elems.erp_info) { 3551 erp_valid = true; 3552 erp_value = elems.erp_info[0]; 3553 } else { 3554 erp_valid = false; 3555 } 3556 changed |= ieee80211_handle_bss_capability(sdata, 3557 le16_to_cpu(mgmt->u.beacon.capab_info), 3558 erp_valid, erp_value); 3559 3560 mutex_lock(&local->sta_mtx); 3561 sta = sta_info_get(sdata, bssid); 3562 3563 if (ieee80211_config_bw(sdata, sta, 3564 elems.ht_cap_elem, elems.ht_operation, 3565 elems.vht_operation, bssid, &changed)) { 3566 mutex_unlock(&local->sta_mtx); 3567 sdata_info(sdata, 3568 "failed to follow AP %pM bandwidth change, disconnect\n", 3569 bssid); 3570 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3571 WLAN_REASON_DEAUTH_LEAVING, 3572 true, deauth_buf); 3573 ieee80211_report_disconnect(sdata, deauth_buf, 3574 sizeof(deauth_buf), true, 3575 WLAN_REASON_DEAUTH_LEAVING); 3576 return; 3577 } 3578 3579 if (sta && elems.opmode_notif) 3580 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3581 rx_status->band); 3582 mutex_unlock(&local->sta_mtx); 3583 3584 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3585 elems.country_elem, 3586 elems.country_elem_len, 3587 elems.pwr_constr_elem, 3588 elems.cisco_dtpc_elem); 3589 3590 ieee80211_bss_info_change_notify(sdata, changed); 3591 } 3592 3593 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3594 struct sk_buff *skb) 3595 { 3596 struct ieee80211_rx_status *rx_status; 3597 struct ieee80211_mgmt *mgmt; 3598 u16 fc; 3599 struct ieee802_11_elems elems; 3600 int ies_len; 3601 3602 rx_status = (struct ieee80211_rx_status *) skb->cb; 3603 mgmt = (struct ieee80211_mgmt *) skb->data; 3604 fc = le16_to_cpu(mgmt->frame_control); 3605 3606 sdata_lock(sdata); 3607 3608 switch (fc & IEEE80211_FCTL_STYPE) { 3609 case IEEE80211_STYPE_BEACON: 3610 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3611 break; 3612 case IEEE80211_STYPE_PROBE_RESP: 3613 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3614 break; 3615 case IEEE80211_STYPE_AUTH: 3616 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3617 break; 3618 case IEEE80211_STYPE_DEAUTH: 3619 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3620 break; 3621 case IEEE80211_STYPE_DISASSOC: 3622 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3623 break; 3624 case IEEE80211_STYPE_ASSOC_RESP: 3625 case IEEE80211_STYPE_REASSOC_RESP: 3626 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3627 break; 3628 case IEEE80211_STYPE_ACTION: 3629 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3630 ies_len = skb->len - 3631 offsetof(struct ieee80211_mgmt, 3632 u.action.u.chan_switch.variable); 3633 3634 if (ies_len < 0) 3635 break; 3636 3637 ieee802_11_parse_elems( 3638 mgmt->u.action.u.chan_switch.variable, 3639 ies_len, true, &elems); 3640 3641 if (elems.parse_error) 3642 break; 3643 3644 ieee80211_sta_process_chanswitch(sdata, 3645 rx_status->mactime, 3646 rx_status->device_timestamp, 3647 &elems, false); 3648 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3649 ies_len = skb->len - 3650 offsetof(struct ieee80211_mgmt, 3651 u.action.u.ext_chan_switch.variable); 3652 3653 if (ies_len < 0) 3654 break; 3655 3656 ieee802_11_parse_elems( 3657 mgmt->u.action.u.ext_chan_switch.variable, 3658 ies_len, true, &elems); 3659 3660 if (elems.parse_error) 3661 break; 3662 3663 /* for the handling code pretend this was also an IE */ 3664 elems.ext_chansw_ie = 3665 &mgmt->u.action.u.ext_chan_switch.data; 3666 3667 ieee80211_sta_process_chanswitch(sdata, 3668 rx_status->mactime, 3669 rx_status->device_timestamp, 3670 &elems, false); 3671 } 3672 break; 3673 } 3674 sdata_unlock(sdata); 3675 } 3676 3677 static void ieee80211_sta_timer(unsigned long data) 3678 { 3679 struct ieee80211_sub_if_data *sdata = 3680 (struct ieee80211_sub_if_data *) data; 3681 3682 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3683 } 3684 3685 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3686 u8 *bssid, u8 reason, bool tx) 3687 { 3688 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3689 3690 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3691 tx, frame_buf); 3692 3693 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3694 reason); 3695 } 3696 3697 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3698 { 3699 struct ieee80211_local *local = sdata->local; 3700 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3701 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3702 u32 tx_flags = 0; 3703 u16 trans = 1; 3704 u16 status = 0; 3705 3706 sdata_assert_lock(sdata); 3707 3708 if (WARN_ON_ONCE(!auth_data)) 3709 return -EINVAL; 3710 3711 auth_data->tries++; 3712 3713 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3714 sdata_info(sdata, "authentication with %pM timed out\n", 3715 auth_data->bss->bssid); 3716 3717 /* 3718 * Most likely AP is not in the range so remove the 3719 * bss struct for that AP. 3720 */ 3721 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3722 3723 return -ETIMEDOUT; 3724 } 3725 3726 drv_mgd_prepare_tx(local, sdata); 3727 3728 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3729 auth_data->bss->bssid, auth_data->tries, 3730 IEEE80211_AUTH_MAX_TRIES); 3731 3732 auth_data->expected_transaction = 2; 3733 3734 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3735 trans = auth_data->sae_trans; 3736 status = auth_data->sae_status; 3737 auth_data->expected_transaction = trans; 3738 } 3739 3740 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3741 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3742 IEEE80211_TX_INTFL_MLME_CONN_TX; 3743 3744 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3745 auth_data->data, auth_data->data_len, 3746 auth_data->bss->bssid, 3747 auth_data->bss->bssid, NULL, 0, 0, 3748 tx_flags); 3749 3750 if (tx_flags == 0) { 3751 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3752 auth_data->timeout_started = true; 3753 run_again(sdata, auth_data->timeout); 3754 } else { 3755 auth_data->timeout = 3756 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3757 auth_data->timeout_started = true; 3758 run_again(sdata, auth_data->timeout); 3759 } 3760 3761 return 0; 3762 } 3763 3764 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3765 { 3766 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3767 struct ieee80211_local *local = sdata->local; 3768 3769 sdata_assert_lock(sdata); 3770 3771 assoc_data->tries++; 3772 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3773 sdata_info(sdata, "association with %pM timed out\n", 3774 assoc_data->bss->bssid); 3775 3776 /* 3777 * Most likely AP is not in the range so remove the 3778 * bss struct for that AP. 3779 */ 3780 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3781 3782 return -ETIMEDOUT; 3783 } 3784 3785 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3786 assoc_data->bss->bssid, assoc_data->tries, 3787 IEEE80211_ASSOC_MAX_TRIES); 3788 ieee80211_send_assoc(sdata); 3789 3790 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3791 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3792 assoc_data->timeout_started = true; 3793 run_again(sdata, assoc_data->timeout); 3794 } else { 3795 assoc_data->timeout = 3796 round_jiffies_up(jiffies + 3797 IEEE80211_ASSOC_TIMEOUT_LONG); 3798 assoc_data->timeout_started = true; 3799 run_again(sdata, assoc_data->timeout); 3800 } 3801 3802 return 0; 3803 } 3804 3805 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3806 __le16 fc, bool acked) 3807 { 3808 struct ieee80211_local *local = sdata->local; 3809 3810 sdata->u.mgd.status_fc = fc; 3811 sdata->u.mgd.status_acked = acked; 3812 sdata->u.mgd.status_received = true; 3813 3814 ieee80211_queue_work(&local->hw, &sdata->work); 3815 } 3816 3817 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3818 { 3819 struct ieee80211_local *local = sdata->local; 3820 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3821 3822 sdata_lock(sdata); 3823 3824 if (ifmgd->status_received) { 3825 __le16 fc = ifmgd->status_fc; 3826 bool status_acked = ifmgd->status_acked; 3827 3828 ifmgd->status_received = false; 3829 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3830 if (status_acked) { 3831 ifmgd->auth_data->timeout = 3832 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3833 run_again(sdata, ifmgd->auth_data->timeout); 3834 } else { 3835 ifmgd->auth_data->timeout = jiffies - 1; 3836 } 3837 ifmgd->auth_data->timeout_started = true; 3838 } else if (ifmgd->assoc_data && 3839 (ieee80211_is_assoc_req(fc) || 3840 ieee80211_is_reassoc_req(fc))) { 3841 if (status_acked) { 3842 ifmgd->assoc_data->timeout = 3843 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3844 run_again(sdata, ifmgd->assoc_data->timeout); 3845 } else { 3846 ifmgd->assoc_data->timeout = jiffies - 1; 3847 } 3848 ifmgd->assoc_data->timeout_started = true; 3849 } 3850 } 3851 3852 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3853 time_after(jiffies, ifmgd->auth_data->timeout)) { 3854 if (ifmgd->auth_data->done) { 3855 /* 3856 * ok ... we waited for assoc but userspace didn't, 3857 * so let's just kill the auth data 3858 */ 3859 ieee80211_destroy_auth_data(sdata, false); 3860 } else if (ieee80211_auth(sdata)) { 3861 u8 bssid[ETH_ALEN]; 3862 struct ieee80211_event event = { 3863 .type = MLME_EVENT, 3864 .u.mlme.data = AUTH_EVENT, 3865 .u.mlme.status = MLME_TIMEOUT, 3866 }; 3867 3868 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3869 3870 ieee80211_destroy_auth_data(sdata, false); 3871 3872 cfg80211_auth_timeout(sdata->dev, bssid); 3873 drv_event_callback(sdata->local, sdata, &event); 3874 } 3875 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3876 run_again(sdata, ifmgd->auth_data->timeout); 3877 3878 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3879 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3880 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3881 ieee80211_do_assoc(sdata)) { 3882 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3883 struct ieee80211_event event = { 3884 .type = MLME_EVENT, 3885 .u.mlme.data = ASSOC_EVENT, 3886 .u.mlme.status = MLME_TIMEOUT, 3887 }; 3888 3889 ieee80211_destroy_assoc_data(sdata, false); 3890 cfg80211_assoc_timeout(sdata->dev, bss); 3891 drv_event_callback(sdata->local, sdata, &event); 3892 } 3893 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3894 run_again(sdata, ifmgd->assoc_data->timeout); 3895 3896 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3897 ifmgd->associated) { 3898 u8 bssid[ETH_ALEN]; 3899 int max_tries; 3900 3901 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3902 3903 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3904 max_tries = max_nullfunc_tries; 3905 else 3906 max_tries = max_probe_tries; 3907 3908 /* ACK received for nullfunc probing frame */ 3909 if (!ifmgd->probe_send_count) 3910 ieee80211_reset_ap_probe(sdata); 3911 else if (ifmgd->nullfunc_failed) { 3912 if (ifmgd->probe_send_count < max_tries) { 3913 mlme_dbg(sdata, 3914 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3915 bssid, ifmgd->probe_send_count, 3916 max_tries); 3917 ieee80211_mgd_probe_ap_send(sdata); 3918 } else { 3919 mlme_dbg(sdata, 3920 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3921 bssid); 3922 ieee80211_sta_connection_lost(sdata, bssid, 3923 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3924 false); 3925 } 3926 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3927 run_again(sdata, ifmgd->probe_timeout); 3928 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3929 mlme_dbg(sdata, 3930 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3931 bssid, probe_wait_ms); 3932 ieee80211_sta_connection_lost(sdata, bssid, 3933 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3934 } else if (ifmgd->probe_send_count < max_tries) { 3935 mlme_dbg(sdata, 3936 "No probe response from AP %pM after %dms, try %d/%i\n", 3937 bssid, probe_wait_ms, 3938 ifmgd->probe_send_count, max_tries); 3939 ieee80211_mgd_probe_ap_send(sdata); 3940 } else { 3941 /* 3942 * We actually lost the connection ... or did we? 3943 * Let's make sure! 3944 */ 3945 mlme_dbg(sdata, 3946 "No probe response from AP %pM after %dms, disconnecting.\n", 3947 bssid, probe_wait_ms); 3948 3949 ieee80211_sta_connection_lost(sdata, bssid, 3950 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3951 } 3952 } 3953 3954 sdata_unlock(sdata); 3955 } 3956 3957 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3958 { 3959 struct ieee80211_sub_if_data *sdata = 3960 (struct ieee80211_sub_if_data *) data; 3961 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3962 3963 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3964 return; 3965 3966 sdata->u.mgd.connection_loss = false; 3967 ieee80211_queue_work(&sdata->local->hw, 3968 &sdata->u.mgd.beacon_connection_loss_work); 3969 } 3970 3971 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3972 { 3973 struct ieee80211_sub_if_data *sdata = 3974 (struct ieee80211_sub_if_data *) data; 3975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3976 struct ieee80211_local *local = sdata->local; 3977 3978 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3979 return; 3980 3981 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3982 } 3983 3984 static void ieee80211_sta_monitor_work(struct work_struct *work) 3985 { 3986 struct ieee80211_sub_if_data *sdata = 3987 container_of(work, struct ieee80211_sub_if_data, 3988 u.mgd.monitor_work); 3989 3990 ieee80211_mgd_probe_ap(sdata, false); 3991 } 3992 3993 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3994 { 3995 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3996 __ieee80211_stop_poll(sdata); 3997 3998 /* let's probe the connection once */ 3999 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 4000 ieee80211_queue_work(&sdata->local->hw, 4001 &sdata->u.mgd.monitor_work); 4002 } 4003 } 4004 4005 #ifdef CONFIG_PM 4006 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4007 { 4008 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4009 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4010 4011 sdata_lock(sdata); 4012 4013 if (ifmgd->auth_data || ifmgd->assoc_data) { 4014 const u8 *bssid = ifmgd->auth_data ? 4015 ifmgd->auth_data->bss->bssid : 4016 ifmgd->assoc_data->bss->bssid; 4017 4018 /* 4019 * If we are trying to authenticate / associate while suspending, 4020 * cfg80211 won't know and won't actually abort those attempts, 4021 * thus we need to do that ourselves. 4022 */ 4023 ieee80211_send_deauth_disassoc(sdata, bssid, 4024 IEEE80211_STYPE_DEAUTH, 4025 WLAN_REASON_DEAUTH_LEAVING, 4026 false, frame_buf); 4027 if (ifmgd->assoc_data) 4028 ieee80211_destroy_assoc_data(sdata, false); 4029 if (ifmgd->auth_data) 4030 ieee80211_destroy_auth_data(sdata, false); 4031 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4032 IEEE80211_DEAUTH_FRAME_LEN); 4033 } 4034 4035 /* This is a bit of a hack - we should find a better and more generic 4036 * solution to this. Normally when suspending, cfg80211 will in fact 4037 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4038 * auth (not so important) or assoc (this is the problem) process. 4039 * 4040 * As a consequence, it can happen that we are in the process of both 4041 * associating and suspending, and receive an association response 4042 * after cfg80211 has checked if it needs to disconnect, but before 4043 * we actually set the flag to drop incoming frames. This will then 4044 * cause the workqueue flush to process the association response in 4045 * the suspend, resulting in a successful association just before it 4046 * tries to remove the interface from the driver, which now though 4047 * has a channel context assigned ... this results in issues. 4048 * 4049 * To work around this (for now) simply deauth here again if we're 4050 * now connected. 4051 */ 4052 if (ifmgd->associated && !sdata->local->wowlan) { 4053 u8 bssid[ETH_ALEN]; 4054 struct cfg80211_deauth_request req = { 4055 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4056 .bssid = bssid, 4057 }; 4058 4059 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4060 ieee80211_mgd_deauth(sdata, &req); 4061 } 4062 4063 sdata_unlock(sdata); 4064 } 4065 4066 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4067 { 4068 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4069 4070 sdata_lock(sdata); 4071 if (!ifmgd->associated) { 4072 sdata_unlock(sdata); 4073 return; 4074 } 4075 4076 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4077 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4078 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4079 ieee80211_sta_connection_lost(sdata, 4080 ifmgd->associated->bssid, 4081 WLAN_REASON_UNSPECIFIED, 4082 true); 4083 sdata_unlock(sdata); 4084 return; 4085 } 4086 sdata_unlock(sdata); 4087 } 4088 #endif 4089 4090 /* interface setup */ 4091 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4092 { 4093 struct ieee80211_if_managed *ifmgd; 4094 4095 ifmgd = &sdata->u.mgd; 4096 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4097 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4098 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4099 ieee80211_beacon_connection_loss_work); 4100 INIT_WORK(&ifmgd->csa_connection_drop_work, 4101 ieee80211_csa_connection_drop_work); 4102 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4103 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4104 ieee80211_tdls_peer_del_work); 4105 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4106 (unsigned long) sdata); 4107 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4108 (unsigned long) sdata); 4109 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4110 (unsigned long) sdata); 4111 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4112 (unsigned long) sdata); 4113 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4114 ieee80211_sta_handle_tspec_ac_params_wk); 4115 4116 ifmgd->flags = 0; 4117 ifmgd->powersave = sdata->wdev.ps; 4118 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4119 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4120 ifmgd->p2p_noa_index = -1; 4121 4122 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4123 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4124 else 4125 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4126 4127 /* Setup TDLS data */ 4128 spin_lock_init(&ifmgd->teardown_lock); 4129 ifmgd->teardown_skb = NULL; 4130 ifmgd->orig_teardown_skb = NULL; 4131 } 4132 4133 /* scan finished notification */ 4134 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4135 { 4136 struct ieee80211_sub_if_data *sdata; 4137 4138 /* Restart STA timers */ 4139 rcu_read_lock(); 4140 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4141 if (ieee80211_sdata_running(sdata)) 4142 ieee80211_restart_sta_timer(sdata); 4143 } 4144 rcu_read_unlock(); 4145 } 4146 4147 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4148 struct cfg80211_bss *cbss) 4149 { 4150 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4151 const u8 *ht_cap_ie, *vht_cap_ie; 4152 const struct ieee80211_ht_cap *ht_cap; 4153 const struct ieee80211_vht_cap *vht_cap; 4154 u8 chains = 1; 4155 4156 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4157 return chains; 4158 4159 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4160 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4161 ht_cap = (void *)(ht_cap_ie + 2); 4162 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4163 /* 4164 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4165 * "Tx Unequal Modulation Supported" fields. 4166 */ 4167 } 4168 4169 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4170 return chains; 4171 4172 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4173 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4174 u8 nss; 4175 u16 tx_mcs_map; 4176 4177 vht_cap = (void *)(vht_cap_ie + 2); 4178 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4179 for (nss = 8; nss > 0; nss--) { 4180 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4181 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4182 break; 4183 } 4184 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4185 chains = max(chains, nss); 4186 } 4187 4188 return chains; 4189 } 4190 4191 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4192 struct cfg80211_bss *cbss) 4193 { 4194 struct ieee80211_local *local = sdata->local; 4195 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4196 const struct ieee80211_ht_cap *ht_cap = NULL; 4197 const struct ieee80211_ht_operation *ht_oper = NULL; 4198 const struct ieee80211_vht_operation *vht_oper = NULL; 4199 struct ieee80211_supported_band *sband; 4200 struct cfg80211_chan_def chandef; 4201 int ret; 4202 u32 i; 4203 bool have_80mhz; 4204 4205 sband = local->hw.wiphy->bands[cbss->channel->band]; 4206 4207 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4208 IEEE80211_STA_DISABLE_80P80MHZ | 4209 IEEE80211_STA_DISABLE_160MHZ); 4210 4211 rcu_read_lock(); 4212 4213 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4214 sband->ht_cap.ht_supported) { 4215 const u8 *ht_oper_ie, *ht_cap_ie; 4216 4217 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4218 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4219 ht_oper = (void *)(ht_oper_ie + 2); 4220 4221 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4222 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4223 ht_cap = (void *)(ht_cap_ie + 2); 4224 4225 if (!ht_cap) { 4226 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4227 ht_oper = NULL; 4228 } 4229 } 4230 4231 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4232 sband->vht_cap.vht_supported) { 4233 const u8 *vht_oper_ie, *vht_cap; 4234 4235 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4236 WLAN_EID_VHT_OPERATION); 4237 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4238 vht_oper = (void *)(vht_oper_ie + 2); 4239 if (vht_oper && !ht_oper) { 4240 vht_oper = NULL; 4241 sdata_info(sdata, 4242 "AP advertised VHT without HT, disabling both\n"); 4243 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4244 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4245 } 4246 4247 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4248 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4249 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4250 vht_oper = NULL; 4251 } 4252 } 4253 4254 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4255 have_80mhz = false; 4256 for (i = 0; i < sband->n_channels; i++) { 4257 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4258 IEEE80211_CHAN_NO_80MHZ)) 4259 continue; 4260 4261 have_80mhz = true; 4262 break; 4263 } 4264 4265 if (!have_80mhz) 4266 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4267 4268 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4269 cbss->channel, 4270 ht_cap, ht_oper, vht_oper, 4271 &chandef, false); 4272 4273 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4274 local->rx_chains); 4275 4276 rcu_read_unlock(); 4277 4278 /* will change later if needed */ 4279 sdata->smps_mode = IEEE80211_SMPS_OFF; 4280 4281 mutex_lock(&local->mtx); 4282 /* 4283 * If this fails (possibly due to channel context sharing 4284 * on incompatible channels, e.g. 80+80 and 160 sharing the 4285 * same control channel) try to use a smaller bandwidth. 4286 */ 4287 ret = ieee80211_vif_use_channel(sdata, &chandef, 4288 IEEE80211_CHANCTX_SHARED); 4289 4290 /* don't downgrade for 5 and 10 MHz channels, though. */ 4291 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4292 chandef.width == NL80211_CHAN_WIDTH_10) 4293 goto out; 4294 4295 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4296 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4297 ret = ieee80211_vif_use_channel(sdata, &chandef, 4298 IEEE80211_CHANCTX_SHARED); 4299 } 4300 out: 4301 mutex_unlock(&local->mtx); 4302 return ret; 4303 } 4304 4305 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4306 struct cfg80211_bss *cbss, bool assoc, 4307 bool override) 4308 { 4309 struct ieee80211_local *local = sdata->local; 4310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4311 struct ieee80211_bss *bss = (void *)cbss->priv; 4312 struct sta_info *new_sta = NULL; 4313 struct ieee80211_supported_band *sband; 4314 bool have_sta = false; 4315 int err; 4316 4317 sband = local->hw.wiphy->bands[cbss->channel->band]; 4318 4319 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4320 return -EINVAL; 4321 4322 if (assoc) { 4323 rcu_read_lock(); 4324 have_sta = sta_info_get(sdata, cbss->bssid); 4325 rcu_read_unlock(); 4326 } 4327 4328 if (!have_sta) { 4329 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4330 if (!new_sta) 4331 return -ENOMEM; 4332 } 4333 4334 if (new_sta || override) { 4335 err = ieee80211_prep_channel(sdata, cbss); 4336 if (err) { 4337 if (new_sta) 4338 sta_info_free(local, new_sta); 4339 return -EINVAL; 4340 } 4341 } 4342 4343 if (new_sta) { 4344 u32 rates = 0, basic_rates = 0; 4345 bool have_higher_than_11mbit; 4346 int min_rate = INT_MAX, min_rate_index = -1; 4347 struct ieee80211_chanctx_conf *chanctx_conf; 4348 const struct cfg80211_bss_ies *ies; 4349 int shift = ieee80211_vif_get_shift(&sdata->vif); 4350 u32 rate_flags; 4351 4352 rcu_read_lock(); 4353 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4354 if (WARN_ON(!chanctx_conf)) { 4355 rcu_read_unlock(); 4356 sta_info_free(local, new_sta); 4357 return -EINVAL; 4358 } 4359 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4360 rcu_read_unlock(); 4361 4362 ieee80211_get_rates(sband, bss->supp_rates, 4363 bss->supp_rates_len, 4364 &rates, &basic_rates, 4365 &have_higher_than_11mbit, 4366 &min_rate, &min_rate_index, 4367 shift, rate_flags); 4368 4369 /* 4370 * This used to be a workaround for basic rates missing 4371 * in the association response frame. Now that we no 4372 * longer use the basic rates from there, it probably 4373 * doesn't happen any more, but keep the workaround so 4374 * in case some *other* APs are buggy in different ways 4375 * we can connect -- with a warning. 4376 */ 4377 if (!basic_rates && min_rate_index >= 0) { 4378 sdata_info(sdata, 4379 "No basic rates, using min rate instead\n"); 4380 basic_rates = BIT(min_rate_index); 4381 } 4382 4383 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4384 sdata->vif.bss_conf.basic_rates = basic_rates; 4385 4386 /* cf. IEEE 802.11 9.2.12 */ 4387 if (cbss->channel->band == NL80211_BAND_2GHZ && 4388 have_higher_than_11mbit) 4389 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4390 else 4391 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4392 4393 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4394 4395 /* set timing information */ 4396 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4397 rcu_read_lock(); 4398 ies = rcu_dereference(cbss->beacon_ies); 4399 if (ies) { 4400 const u8 *tim_ie; 4401 4402 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4403 sdata->vif.bss_conf.sync_device_ts = 4404 bss->device_ts_beacon; 4405 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4406 ies->data, ies->len); 4407 if (tim_ie && tim_ie[1] >= 2) 4408 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4409 else 4410 sdata->vif.bss_conf.sync_dtim_count = 0; 4411 } else if (!ieee80211_hw_check(&sdata->local->hw, 4412 TIMING_BEACON_ONLY)) { 4413 ies = rcu_dereference(cbss->proberesp_ies); 4414 /* must be non-NULL since beacon IEs were NULL */ 4415 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4416 sdata->vif.bss_conf.sync_device_ts = 4417 bss->device_ts_presp; 4418 sdata->vif.bss_conf.sync_dtim_count = 0; 4419 } else { 4420 sdata->vif.bss_conf.sync_tsf = 0; 4421 sdata->vif.bss_conf.sync_device_ts = 0; 4422 sdata->vif.bss_conf.sync_dtim_count = 0; 4423 } 4424 rcu_read_unlock(); 4425 4426 /* tell driver about BSSID, basic rates and timing */ 4427 ieee80211_bss_info_change_notify(sdata, 4428 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4429 BSS_CHANGED_BEACON_INT); 4430 4431 if (assoc) 4432 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4433 4434 err = sta_info_insert(new_sta); 4435 new_sta = NULL; 4436 if (err) { 4437 sdata_info(sdata, 4438 "failed to insert STA entry for the AP (error %d)\n", 4439 err); 4440 return err; 4441 } 4442 } else 4443 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4444 4445 /* Cancel scan to ensure that nothing interferes with connection */ 4446 if (local->scanning) 4447 ieee80211_scan_cancel(local); 4448 4449 return 0; 4450 } 4451 4452 /* config hooks */ 4453 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4454 struct cfg80211_auth_request *req) 4455 { 4456 struct ieee80211_local *local = sdata->local; 4457 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4458 struct ieee80211_mgd_auth_data *auth_data; 4459 u16 auth_alg; 4460 int err; 4461 4462 /* prepare auth data structure */ 4463 4464 switch (req->auth_type) { 4465 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4466 auth_alg = WLAN_AUTH_OPEN; 4467 break; 4468 case NL80211_AUTHTYPE_SHARED_KEY: 4469 if (IS_ERR(local->wep_tx_tfm)) 4470 return -EOPNOTSUPP; 4471 auth_alg = WLAN_AUTH_SHARED_KEY; 4472 break; 4473 case NL80211_AUTHTYPE_FT: 4474 auth_alg = WLAN_AUTH_FT; 4475 break; 4476 case NL80211_AUTHTYPE_NETWORK_EAP: 4477 auth_alg = WLAN_AUTH_LEAP; 4478 break; 4479 case NL80211_AUTHTYPE_SAE: 4480 auth_alg = WLAN_AUTH_SAE; 4481 break; 4482 default: 4483 return -EOPNOTSUPP; 4484 } 4485 4486 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4487 req->ie_len, GFP_KERNEL); 4488 if (!auth_data) 4489 return -ENOMEM; 4490 4491 auth_data->bss = req->bss; 4492 4493 if (req->sae_data_len >= 4) { 4494 __le16 *pos = (__le16 *) req->sae_data; 4495 auth_data->sae_trans = le16_to_cpu(pos[0]); 4496 auth_data->sae_status = le16_to_cpu(pos[1]); 4497 memcpy(auth_data->data, req->sae_data + 4, 4498 req->sae_data_len - 4); 4499 auth_data->data_len += req->sae_data_len - 4; 4500 } 4501 4502 if (req->ie && req->ie_len) { 4503 memcpy(&auth_data->data[auth_data->data_len], 4504 req->ie, req->ie_len); 4505 auth_data->data_len += req->ie_len; 4506 } 4507 4508 if (req->key && req->key_len) { 4509 auth_data->key_len = req->key_len; 4510 auth_data->key_idx = req->key_idx; 4511 memcpy(auth_data->key, req->key, req->key_len); 4512 } 4513 4514 auth_data->algorithm = auth_alg; 4515 4516 /* try to authenticate/probe */ 4517 4518 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4519 ifmgd->assoc_data) { 4520 err = -EBUSY; 4521 goto err_free; 4522 } 4523 4524 if (ifmgd->auth_data) 4525 ieee80211_destroy_auth_data(sdata, false); 4526 4527 /* prep auth_data so we don't go into idle on disassoc */ 4528 ifmgd->auth_data = auth_data; 4529 4530 if (ifmgd->associated) { 4531 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4532 4533 sdata_info(sdata, 4534 "disconnect from AP %pM for new auth to %pM\n", 4535 ifmgd->associated->bssid, req->bss->bssid); 4536 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4537 WLAN_REASON_UNSPECIFIED, 4538 false, frame_buf); 4539 4540 ieee80211_report_disconnect(sdata, frame_buf, 4541 sizeof(frame_buf), true, 4542 WLAN_REASON_UNSPECIFIED); 4543 } 4544 4545 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4546 4547 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4548 if (err) 4549 goto err_clear; 4550 4551 err = ieee80211_auth(sdata); 4552 if (err) { 4553 sta_info_destroy_addr(sdata, req->bss->bssid); 4554 goto err_clear; 4555 } 4556 4557 /* hold our own reference */ 4558 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4559 return 0; 4560 4561 err_clear: 4562 eth_zero_addr(ifmgd->bssid); 4563 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4564 ifmgd->auth_data = NULL; 4565 mutex_lock(&sdata->local->mtx); 4566 ieee80211_vif_release_channel(sdata); 4567 mutex_unlock(&sdata->local->mtx); 4568 err_free: 4569 kfree(auth_data); 4570 return err; 4571 } 4572 4573 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4574 struct cfg80211_assoc_request *req) 4575 { 4576 struct ieee80211_local *local = sdata->local; 4577 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4578 struct ieee80211_bss *bss = (void *)req->bss->priv; 4579 struct ieee80211_mgd_assoc_data *assoc_data; 4580 const struct cfg80211_bss_ies *beacon_ies; 4581 struct ieee80211_supported_band *sband; 4582 const u8 *ssidie, *ht_ie, *vht_ie; 4583 int i, err; 4584 bool override = false; 4585 4586 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4587 if (!assoc_data) 4588 return -ENOMEM; 4589 4590 rcu_read_lock(); 4591 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4592 if (!ssidie) { 4593 rcu_read_unlock(); 4594 kfree(assoc_data); 4595 return -EINVAL; 4596 } 4597 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4598 assoc_data->ssid_len = ssidie[1]; 4599 rcu_read_unlock(); 4600 4601 if (ifmgd->associated) { 4602 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4603 4604 sdata_info(sdata, 4605 "disconnect from AP %pM for new assoc to %pM\n", 4606 ifmgd->associated->bssid, req->bss->bssid); 4607 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4608 WLAN_REASON_UNSPECIFIED, 4609 false, frame_buf); 4610 4611 ieee80211_report_disconnect(sdata, frame_buf, 4612 sizeof(frame_buf), true, 4613 WLAN_REASON_UNSPECIFIED); 4614 } 4615 4616 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4617 err = -EBUSY; 4618 goto err_free; 4619 } 4620 4621 if (ifmgd->assoc_data) { 4622 err = -EBUSY; 4623 goto err_free; 4624 } 4625 4626 if (ifmgd->auth_data) { 4627 bool match; 4628 4629 /* keep sta info, bssid if matching */ 4630 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4631 ieee80211_destroy_auth_data(sdata, match); 4632 } 4633 4634 /* prepare assoc data */ 4635 4636 ifmgd->beacon_crc_valid = false; 4637 4638 assoc_data->wmm = bss->wmm_used && 4639 (local->hw.queues >= IEEE80211_NUM_ACS); 4640 4641 /* 4642 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4643 * We still associate in non-HT mode (11a/b/g) if any one of these 4644 * ciphers is configured as pairwise. 4645 * We can set this to true for non-11n hardware, that'll be checked 4646 * separately along with the peer capabilities. 4647 */ 4648 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4649 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4650 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4651 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4652 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4653 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4654 netdev_info(sdata->dev, 4655 "disabling HT/VHT due to WEP/TKIP use\n"); 4656 } 4657 } 4658 4659 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4660 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4661 if (!sband->ht_cap.ht_supported || 4662 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4663 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4664 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4665 if (!bss->wmm_used && 4666 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4667 netdev_info(sdata->dev, 4668 "disabling HT as WMM/QoS is not supported by the AP\n"); 4669 } 4670 4671 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4672 if (!sband->vht_cap.vht_supported || 4673 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4674 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4675 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4676 if (!bss->wmm_used && 4677 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4678 netdev_info(sdata->dev, 4679 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4680 } 4681 4682 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4683 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4684 sizeof(ifmgd->ht_capa_mask)); 4685 4686 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4687 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4688 sizeof(ifmgd->vht_capa_mask)); 4689 4690 if (req->ie && req->ie_len) { 4691 memcpy(assoc_data->ie, req->ie, req->ie_len); 4692 assoc_data->ie_len = req->ie_len; 4693 } 4694 4695 assoc_data->bss = req->bss; 4696 4697 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4698 if (ifmgd->powersave) 4699 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4700 else 4701 sdata->smps_mode = IEEE80211_SMPS_OFF; 4702 } else 4703 sdata->smps_mode = ifmgd->req_smps; 4704 4705 assoc_data->capability = req->bss->capability; 4706 assoc_data->supp_rates = bss->supp_rates; 4707 assoc_data->supp_rates_len = bss->supp_rates_len; 4708 4709 rcu_read_lock(); 4710 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4711 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4712 assoc_data->ap_ht_param = 4713 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4714 else 4715 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4716 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4717 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4718 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4719 sizeof(struct ieee80211_vht_cap)); 4720 else 4721 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4722 rcu_read_unlock(); 4723 4724 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4725 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4726 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4727 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4728 4729 if (bss->wmm_used && bss->uapsd_supported && 4730 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4731 assoc_data->uapsd = true; 4732 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4733 } else { 4734 assoc_data->uapsd = false; 4735 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4736 } 4737 4738 if (req->prev_bssid) 4739 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4740 4741 if (req->use_mfp) { 4742 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4743 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4744 } else { 4745 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4746 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4747 } 4748 4749 if (req->flags & ASSOC_REQ_USE_RRM) 4750 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4751 else 4752 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4753 4754 if (req->crypto.control_port) 4755 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4756 else 4757 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4758 4759 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4760 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4761 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4762 sdata->vif.type); 4763 4764 /* kick off associate process */ 4765 4766 ifmgd->assoc_data = assoc_data; 4767 ifmgd->dtim_period = 0; 4768 ifmgd->have_beacon = false; 4769 4770 /* override HT/VHT configuration only if the AP and we support it */ 4771 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4772 struct ieee80211_sta_ht_cap sta_ht_cap; 4773 4774 if (req->flags & ASSOC_REQ_DISABLE_HT) 4775 override = true; 4776 4777 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4778 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4779 4780 /* check for 40 MHz disable override */ 4781 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4782 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4783 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4784 override = true; 4785 4786 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4787 req->flags & ASSOC_REQ_DISABLE_VHT) 4788 override = true; 4789 } 4790 4791 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4792 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4793 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4794 } 4795 4796 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4797 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4798 4799 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4800 if (err) 4801 goto err_clear; 4802 4803 rcu_read_lock(); 4804 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4805 4806 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4807 !beacon_ies) { 4808 /* 4809 * Wait up to one beacon interval ... 4810 * should this be more if we miss one? 4811 */ 4812 sdata_info(sdata, "waiting for beacon from %pM\n", 4813 ifmgd->bssid); 4814 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4815 assoc_data->timeout_started = true; 4816 assoc_data->need_beacon = true; 4817 } else if (beacon_ies) { 4818 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4819 beacon_ies->data, 4820 beacon_ies->len); 4821 u8 dtim_count = 0; 4822 4823 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4824 const struct ieee80211_tim_ie *tim; 4825 tim = (void *)(tim_ie + 2); 4826 ifmgd->dtim_period = tim->dtim_period; 4827 dtim_count = tim->dtim_count; 4828 } 4829 ifmgd->have_beacon = true; 4830 assoc_data->timeout = jiffies; 4831 assoc_data->timeout_started = true; 4832 4833 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4834 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4835 sdata->vif.bss_conf.sync_device_ts = 4836 bss->device_ts_beacon; 4837 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4838 } 4839 } else { 4840 assoc_data->timeout = jiffies; 4841 assoc_data->timeout_started = true; 4842 } 4843 rcu_read_unlock(); 4844 4845 run_again(sdata, assoc_data->timeout); 4846 4847 if (bss->corrupt_data) { 4848 char *corrupt_type = "data"; 4849 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4850 if (bss->corrupt_data & 4851 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4852 corrupt_type = "beacon and probe response"; 4853 else 4854 corrupt_type = "beacon"; 4855 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4856 corrupt_type = "probe response"; 4857 sdata_info(sdata, "associating with AP with corrupt %s\n", 4858 corrupt_type); 4859 } 4860 4861 return 0; 4862 err_clear: 4863 eth_zero_addr(ifmgd->bssid); 4864 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4865 ifmgd->assoc_data = NULL; 4866 err_free: 4867 kfree(assoc_data); 4868 return err; 4869 } 4870 4871 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4872 struct cfg80211_deauth_request *req) 4873 { 4874 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4875 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4876 bool tx = !req->local_state_change; 4877 4878 if (ifmgd->auth_data && 4879 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4880 sdata_info(sdata, 4881 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4882 req->bssid, req->reason_code, 4883 ieee80211_get_reason_code_string(req->reason_code)); 4884 4885 drv_mgd_prepare_tx(sdata->local, sdata); 4886 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4887 IEEE80211_STYPE_DEAUTH, 4888 req->reason_code, tx, 4889 frame_buf); 4890 ieee80211_destroy_auth_data(sdata, false); 4891 ieee80211_report_disconnect(sdata, frame_buf, 4892 sizeof(frame_buf), true, 4893 req->reason_code); 4894 4895 return 0; 4896 } 4897 4898 if (ifmgd->assoc_data && 4899 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4900 sdata_info(sdata, 4901 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4902 req->bssid, req->reason_code, 4903 ieee80211_get_reason_code_string(req->reason_code)); 4904 4905 drv_mgd_prepare_tx(sdata->local, sdata); 4906 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4907 IEEE80211_STYPE_DEAUTH, 4908 req->reason_code, tx, 4909 frame_buf); 4910 ieee80211_destroy_assoc_data(sdata, false); 4911 ieee80211_report_disconnect(sdata, frame_buf, 4912 sizeof(frame_buf), true, 4913 req->reason_code); 4914 return 0; 4915 } 4916 4917 if (ifmgd->associated && 4918 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4919 sdata_info(sdata, 4920 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4921 req->bssid, req->reason_code, 4922 ieee80211_get_reason_code_string(req->reason_code)); 4923 4924 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4925 req->reason_code, tx, frame_buf); 4926 ieee80211_report_disconnect(sdata, frame_buf, 4927 sizeof(frame_buf), true, 4928 req->reason_code); 4929 return 0; 4930 } 4931 4932 return -ENOTCONN; 4933 } 4934 4935 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4936 struct cfg80211_disassoc_request *req) 4937 { 4938 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4939 u8 bssid[ETH_ALEN]; 4940 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4941 4942 /* 4943 * cfg80211 should catch this ... but it's racy since 4944 * we can receive a disassoc frame, process it, hand it 4945 * to cfg80211 while that's in a locked section already 4946 * trying to tell us that the user wants to disconnect. 4947 */ 4948 if (ifmgd->associated != req->bss) 4949 return -ENOLINK; 4950 4951 sdata_info(sdata, 4952 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4953 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4954 4955 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4956 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4957 req->reason_code, !req->local_state_change, 4958 frame_buf); 4959 4960 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 4961 req->reason_code); 4962 4963 return 0; 4964 } 4965 4966 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4967 { 4968 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4969 4970 /* 4971 * Make sure some work items will not run after this, 4972 * they will not do anything but might not have been 4973 * cancelled when disconnecting. 4974 */ 4975 cancel_work_sync(&ifmgd->monitor_work); 4976 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4977 cancel_work_sync(&ifmgd->request_smps_work); 4978 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4979 cancel_work_sync(&ifmgd->chswitch_work); 4980 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4981 4982 sdata_lock(sdata); 4983 if (ifmgd->assoc_data) { 4984 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4985 ieee80211_destroy_assoc_data(sdata, false); 4986 cfg80211_assoc_timeout(sdata->dev, bss); 4987 } 4988 if (ifmgd->auth_data) 4989 ieee80211_destroy_auth_data(sdata, false); 4990 spin_lock_bh(&ifmgd->teardown_lock); 4991 if (ifmgd->teardown_skb) { 4992 kfree_skb(ifmgd->teardown_skb); 4993 ifmgd->teardown_skb = NULL; 4994 ifmgd->orig_teardown_skb = NULL; 4995 } 4996 spin_unlock_bh(&ifmgd->teardown_lock); 4997 del_timer_sync(&ifmgd->timer); 4998 sdata_unlock(sdata); 4999 } 5000 5001 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 5002 enum nl80211_cqm_rssi_threshold_event rssi_event, 5003 gfp_t gfp) 5004 { 5005 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5006 5007 trace_api_cqm_rssi_notify(sdata, rssi_event); 5008 5009 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 5010 } 5011 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5012 5013 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5014 { 5015 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5016 5017 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5018 5019 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5020 } 5021 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5022