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 /* The loop will result in using BK even if it requires 1676 * admission control, such configuration makes no sense 1677 * and we have to transmit somehow - the AC selection 1678 * does the same thing. 1679 */ 1680 if (drv_conf_tx(local, sdata, ac, 1681 &sdata->tx_conf[non_acm_ac])) 1682 sdata_err(sdata, 1683 "failed to set TX queue parameters for queue %d\n", 1684 ac); 1685 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1686 ret = true; 1687 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1688 tx_tspec->time_slice_start + HZ - now + 1); 1689 break; 1690 case TX_TSPEC_ACTION_NONE: 1691 /* nothing now */ 1692 break; 1693 } 1694 } 1695 1696 return ret; 1697 } 1698 1699 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1700 { 1701 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1702 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1703 } 1704 1705 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1706 { 1707 struct ieee80211_sub_if_data *sdata; 1708 1709 sdata = container_of(work, struct ieee80211_sub_if_data, 1710 u.mgd.tx_tspec_wk.work); 1711 ieee80211_sta_handle_tspec_ac_params(sdata); 1712 } 1713 1714 /* MLME */ 1715 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1716 struct ieee80211_sub_if_data *sdata, 1717 const u8 *wmm_param, size_t wmm_param_len) 1718 { 1719 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1720 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1721 size_t left; 1722 int count, ac; 1723 const u8 *pos; 1724 u8 uapsd_queues = 0; 1725 1726 if (!local->ops->conf_tx) 1727 return false; 1728 1729 if (local->hw.queues < IEEE80211_NUM_ACS) 1730 return false; 1731 1732 if (!wmm_param) 1733 return false; 1734 1735 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1736 return false; 1737 1738 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1739 uapsd_queues = ifmgd->uapsd_queues; 1740 1741 count = wmm_param[6] & 0x0f; 1742 if (count == ifmgd->wmm_last_param_set) 1743 return false; 1744 ifmgd->wmm_last_param_set = count; 1745 1746 pos = wmm_param + 8; 1747 left = wmm_param_len - 8; 1748 1749 memset(¶ms, 0, sizeof(params)); 1750 1751 sdata->wmm_acm = 0; 1752 for (; left >= 4; left -= 4, pos += 4) { 1753 int aci = (pos[0] >> 5) & 0x03; 1754 int acm = (pos[0] >> 4) & 0x01; 1755 bool uapsd = false; 1756 1757 switch (aci) { 1758 case 1: /* AC_BK */ 1759 ac = IEEE80211_AC_BK; 1760 if (acm) 1761 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1762 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1763 uapsd = true; 1764 break; 1765 case 2: /* AC_VI */ 1766 ac = IEEE80211_AC_VI; 1767 if (acm) 1768 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1769 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1770 uapsd = true; 1771 break; 1772 case 3: /* AC_VO */ 1773 ac = IEEE80211_AC_VO; 1774 if (acm) 1775 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1776 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1777 uapsd = true; 1778 break; 1779 case 0: /* AC_BE */ 1780 default: 1781 ac = IEEE80211_AC_BE; 1782 if (acm) 1783 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1784 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1785 uapsd = true; 1786 break; 1787 } 1788 1789 params[ac].aifs = pos[0] & 0x0f; 1790 1791 if (params[ac].aifs < 2) { 1792 sdata_info(sdata, 1793 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1794 params[ac].aifs, aci); 1795 params[ac].aifs = 2; 1796 } 1797 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1798 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1799 params[ac].txop = get_unaligned_le16(pos + 2); 1800 params[ac].acm = acm; 1801 params[ac].uapsd = uapsd; 1802 1803 if (params[ac].cw_min > params[ac].cw_max) { 1804 sdata_info(sdata, 1805 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1806 params[ac].cw_min, params[ac].cw_max, aci); 1807 return false; 1808 } 1809 } 1810 1811 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1812 mlme_dbg(sdata, 1813 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1814 ac, params[ac].acm, 1815 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1816 params[ac].txop, params[ac].uapsd, 1817 ifmgd->tx_tspec[ac].downgraded); 1818 sdata->tx_conf[ac] = params[ac]; 1819 if (!ifmgd->tx_tspec[ac].downgraded && 1820 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1821 sdata_err(sdata, 1822 "failed to set TX queue parameters for AC %d\n", 1823 ac); 1824 } 1825 1826 /* enable WMM or activate new settings */ 1827 sdata->vif.bss_conf.qos = true; 1828 return true; 1829 } 1830 1831 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1832 { 1833 lockdep_assert_held(&sdata->local->mtx); 1834 1835 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1836 ieee80211_run_deferred_scan(sdata->local); 1837 } 1838 1839 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1840 { 1841 mutex_lock(&sdata->local->mtx); 1842 __ieee80211_stop_poll(sdata); 1843 mutex_unlock(&sdata->local->mtx); 1844 } 1845 1846 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1847 u16 capab, bool erp_valid, u8 erp) 1848 { 1849 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1850 u32 changed = 0; 1851 bool use_protection; 1852 bool use_short_preamble; 1853 bool use_short_slot; 1854 1855 if (erp_valid) { 1856 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1857 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1858 } else { 1859 use_protection = false; 1860 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1861 } 1862 1863 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1864 if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ) 1865 use_short_slot = true; 1866 1867 if (use_protection != bss_conf->use_cts_prot) { 1868 bss_conf->use_cts_prot = use_protection; 1869 changed |= BSS_CHANGED_ERP_CTS_PROT; 1870 } 1871 1872 if (use_short_preamble != bss_conf->use_short_preamble) { 1873 bss_conf->use_short_preamble = use_short_preamble; 1874 changed |= BSS_CHANGED_ERP_PREAMBLE; 1875 } 1876 1877 if (use_short_slot != bss_conf->use_short_slot) { 1878 bss_conf->use_short_slot = use_short_slot; 1879 changed |= BSS_CHANGED_ERP_SLOT; 1880 } 1881 1882 return changed; 1883 } 1884 1885 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1886 struct cfg80211_bss *cbss, 1887 u32 bss_info_changed) 1888 { 1889 struct ieee80211_bss *bss = (void *)cbss->priv; 1890 struct ieee80211_local *local = sdata->local; 1891 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1892 1893 bss_info_changed |= BSS_CHANGED_ASSOC; 1894 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1895 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1896 1897 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1898 beacon_loss_count * bss_conf->beacon_int)); 1899 1900 sdata->u.mgd.associated = cbss; 1901 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1902 1903 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1904 1905 if (sdata->vif.p2p || 1906 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1907 const struct cfg80211_bss_ies *ies; 1908 1909 rcu_read_lock(); 1910 ies = rcu_dereference(cbss->ies); 1911 if (ies) { 1912 int ret; 1913 1914 ret = cfg80211_get_p2p_attr( 1915 ies->data, ies->len, 1916 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1917 (u8 *) &bss_conf->p2p_noa_attr, 1918 sizeof(bss_conf->p2p_noa_attr)); 1919 if (ret >= 2) { 1920 sdata->u.mgd.p2p_noa_index = 1921 bss_conf->p2p_noa_attr.index; 1922 bss_info_changed |= BSS_CHANGED_P2P_PS; 1923 } 1924 } 1925 rcu_read_unlock(); 1926 } 1927 1928 /* just to be sure */ 1929 ieee80211_stop_poll(sdata); 1930 1931 ieee80211_led_assoc(local, 1); 1932 1933 if (sdata->u.mgd.have_beacon) { 1934 /* 1935 * If the AP is buggy we may get here with no DTIM period 1936 * known, so assume it's 1 which is the only safe assumption 1937 * in that case, although if the TIM IE is broken powersave 1938 * probably just won't work at all. 1939 */ 1940 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1941 bss_conf->beacon_rate = bss->beacon_rate; 1942 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1943 } else { 1944 bss_conf->beacon_rate = NULL; 1945 bss_conf->dtim_period = 0; 1946 } 1947 1948 bss_conf->assoc = 1; 1949 1950 /* Tell the driver to monitor connection quality (if supported) */ 1951 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1952 bss_conf->cqm_rssi_thold) 1953 bss_info_changed |= BSS_CHANGED_CQM; 1954 1955 /* Enable ARP filtering */ 1956 if (bss_conf->arp_addr_cnt) 1957 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1958 1959 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1960 1961 mutex_lock(&local->iflist_mtx); 1962 ieee80211_recalc_ps(local); 1963 mutex_unlock(&local->iflist_mtx); 1964 1965 ieee80211_recalc_smps(sdata); 1966 ieee80211_recalc_ps_vif(sdata); 1967 1968 netif_carrier_on(sdata->dev); 1969 } 1970 1971 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1972 u16 stype, u16 reason, bool tx, 1973 u8 *frame_buf) 1974 { 1975 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1976 struct ieee80211_local *local = sdata->local; 1977 u32 changed = 0; 1978 1979 sdata_assert_lock(sdata); 1980 1981 if (WARN_ON_ONCE(tx && !frame_buf)) 1982 return; 1983 1984 if (WARN_ON(!ifmgd->associated)) 1985 return; 1986 1987 ieee80211_stop_poll(sdata); 1988 1989 ifmgd->associated = NULL; 1990 netif_carrier_off(sdata->dev); 1991 1992 /* 1993 * if we want to get out of ps before disassoc (why?) we have 1994 * to do it before sending disassoc, as otherwise the null-packet 1995 * won't be valid. 1996 */ 1997 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1998 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1999 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2000 } 2001 local->ps_sdata = NULL; 2002 2003 /* disable per-vif ps */ 2004 ieee80211_recalc_ps_vif(sdata); 2005 2006 /* make sure ongoing transmission finishes */ 2007 synchronize_net(); 2008 2009 /* 2010 * drop any frame before deauth/disassoc, this can be data or 2011 * management frame. Since we are disconnecting, we should not 2012 * insist sending these frames which can take time and delay 2013 * the disconnection and possible the roaming. 2014 */ 2015 if (tx) 2016 ieee80211_flush_queues(local, sdata, true); 2017 2018 /* deauthenticate/disassociate now */ 2019 if (tx || frame_buf) 2020 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2021 reason, tx, frame_buf); 2022 2023 /* flush out frame - make sure the deauth was actually sent */ 2024 if (tx) 2025 ieee80211_flush_queues(local, sdata, false); 2026 2027 /* clear bssid only after building the needed mgmt frames */ 2028 eth_zero_addr(ifmgd->bssid); 2029 2030 /* remove AP and TDLS peers */ 2031 sta_info_flush(sdata); 2032 2033 /* finally reset all BSS / config parameters */ 2034 changed |= ieee80211_reset_erp_info(sdata); 2035 2036 ieee80211_led_assoc(local, 0); 2037 changed |= BSS_CHANGED_ASSOC; 2038 sdata->vif.bss_conf.assoc = false; 2039 2040 ifmgd->p2p_noa_index = -1; 2041 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2042 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2043 2044 /* on the next assoc, re-program HT/VHT parameters */ 2045 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2046 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2047 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2048 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2049 2050 /* reset MU-MIMO ownership and group data */ 2051 memset(sdata->vif.bss_conf.mu_group.membership, 0, 2052 sizeof(sdata->vif.bss_conf.mu_group.membership)); 2053 memset(sdata->vif.bss_conf.mu_group.position, 0, 2054 sizeof(sdata->vif.bss_conf.mu_group.position)); 2055 changed |= BSS_CHANGED_MU_GROUPS; 2056 sdata->vif.mu_mimo_owner = false; 2057 2058 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2059 2060 del_timer_sync(&local->dynamic_ps_timer); 2061 cancel_work_sync(&local->dynamic_ps_enable_work); 2062 2063 /* Disable ARP filtering */ 2064 if (sdata->vif.bss_conf.arp_addr_cnt) 2065 changed |= BSS_CHANGED_ARP_FILTER; 2066 2067 sdata->vif.bss_conf.qos = false; 2068 changed |= BSS_CHANGED_QOS; 2069 2070 /* The BSSID (not really interesting) and HT changed */ 2071 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2072 ieee80211_bss_info_change_notify(sdata, changed); 2073 2074 /* disassociated - set to defaults now */ 2075 ieee80211_set_wmm_default(sdata, false, false); 2076 2077 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2078 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2079 del_timer_sync(&sdata->u.mgd.timer); 2080 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2081 2082 sdata->vif.bss_conf.dtim_period = 0; 2083 sdata->vif.bss_conf.beacon_rate = NULL; 2084 2085 ifmgd->have_beacon = false; 2086 2087 ifmgd->flags = 0; 2088 mutex_lock(&local->mtx); 2089 ieee80211_vif_release_channel(sdata); 2090 2091 sdata->vif.csa_active = false; 2092 ifmgd->csa_waiting_bcn = false; 2093 ifmgd->csa_ignored_same_chan = false; 2094 if (sdata->csa_block_tx) { 2095 ieee80211_wake_vif_queues(local, sdata, 2096 IEEE80211_QUEUE_STOP_REASON_CSA); 2097 sdata->csa_block_tx = false; 2098 } 2099 mutex_unlock(&local->mtx); 2100 2101 /* existing TX TSPEC sessions no longer exist */ 2102 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2103 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2104 2105 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2106 } 2107 2108 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2109 struct ieee80211_hdr *hdr) 2110 { 2111 /* 2112 * We can postpone the mgd.timer whenever receiving unicast frames 2113 * from AP because we know that the connection is working both ways 2114 * at that time. But multicast frames (and hence also beacons) must 2115 * be ignored here, because we need to trigger the timer during 2116 * data idle periods for sending the periodic probe request to the 2117 * AP we're connected to. 2118 */ 2119 if (is_multicast_ether_addr(hdr->addr1)) 2120 return; 2121 2122 ieee80211_sta_reset_conn_monitor(sdata); 2123 } 2124 2125 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2126 { 2127 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2128 struct ieee80211_local *local = sdata->local; 2129 2130 mutex_lock(&local->mtx); 2131 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2132 goto out; 2133 2134 __ieee80211_stop_poll(sdata); 2135 2136 mutex_lock(&local->iflist_mtx); 2137 ieee80211_recalc_ps(local); 2138 mutex_unlock(&local->iflist_mtx); 2139 2140 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2141 goto out; 2142 2143 /* 2144 * We've received a probe response, but are not sure whether 2145 * we have or will be receiving any beacons or data, so let's 2146 * schedule the timers again, just in case. 2147 */ 2148 ieee80211_sta_reset_beacon_monitor(sdata); 2149 2150 mod_timer(&ifmgd->conn_mon_timer, 2151 round_jiffies_up(jiffies + 2152 IEEE80211_CONNECTION_IDLE_TIME)); 2153 out: 2154 mutex_unlock(&local->mtx); 2155 } 2156 2157 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2158 struct ieee80211_hdr *hdr, 2159 u16 tx_time) 2160 { 2161 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2162 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2163 int ac = ieee80211_ac_from_tid(tid); 2164 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2165 unsigned long now = jiffies; 2166 2167 if (likely(!tx_tspec->admitted_time)) 2168 return; 2169 2170 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2171 tx_tspec->consumed_tx_time = 0; 2172 tx_tspec->time_slice_start = now; 2173 2174 if (tx_tspec->downgraded) { 2175 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2176 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2177 } 2178 } 2179 2180 if (tx_tspec->downgraded) 2181 return; 2182 2183 tx_tspec->consumed_tx_time += tx_time; 2184 2185 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2186 tx_tspec->downgraded = true; 2187 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2188 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2189 } 2190 } 2191 2192 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2193 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2194 { 2195 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2196 2197 if (!ieee80211_is_data(hdr->frame_control)) 2198 return; 2199 2200 if (ieee80211_is_nullfunc(hdr->frame_control) && 2201 sdata->u.mgd.probe_send_count > 0) { 2202 if (ack) 2203 ieee80211_sta_reset_conn_monitor(sdata); 2204 else 2205 sdata->u.mgd.nullfunc_failed = true; 2206 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2207 return; 2208 } 2209 2210 if (ack) 2211 ieee80211_sta_reset_conn_monitor(sdata); 2212 } 2213 2214 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2215 { 2216 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2217 const u8 *ssid; 2218 u8 *dst = ifmgd->associated->bssid; 2219 u8 unicast_limit = max(1, max_probe_tries - 3); 2220 struct sta_info *sta; 2221 2222 /* 2223 * Try sending broadcast probe requests for the last three 2224 * probe requests after the first ones failed since some 2225 * buggy APs only support broadcast probe requests. 2226 */ 2227 if (ifmgd->probe_send_count >= unicast_limit) 2228 dst = NULL; 2229 2230 /* 2231 * When the hardware reports an accurate Tx ACK status, it's 2232 * better to send a nullfunc frame instead of a probe request, 2233 * as it will kick us off the AP quickly if we aren't associated 2234 * anymore. The timeout will be reset if the frame is ACKed by 2235 * the AP. 2236 */ 2237 ifmgd->probe_send_count++; 2238 2239 if (dst) { 2240 mutex_lock(&sdata->local->sta_mtx); 2241 sta = sta_info_get(sdata, dst); 2242 if (!WARN_ON(!sta)) 2243 ieee80211_check_fast_rx(sta); 2244 mutex_unlock(&sdata->local->sta_mtx); 2245 } 2246 2247 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2248 ifmgd->nullfunc_failed = false; 2249 ieee80211_send_nullfunc(sdata->local, sdata, false); 2250 } else { 2251 int ssid_len; 2252 2253 rcu_read_lock(); 2254 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2255 if (WARN_ON_ONCE(ssid == NULL)) 2256 ssid_len = 0; 2257 else 2258 ssid_len = ssid[1]; 2259 2260 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2261 ssid + 2, ssid_len, NULL, 2262 0, (u32) -1, true, 0, 2263 ifmgd->associated->channel, false); 2264 rcu_read_unlock(); 2265 } 2266 2267 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2268 run_again(sdata, ifmgd->probe_timeout); 2269 } 2270 2271 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2272 bool beacon) 2273 { 2274 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2275 bool already = false; 2276 2277 if (!ieee80211_sdata_running(sdata)) 2278 return; 2279 2280 sdata_lock(sdata); 2281 2282 if (!ifmgd->associated) 2283 goto out; 2284 2285 mutex_lock(&sdata->local->mtx); 2286 2287 if (sdata->local->tmp_channel || sdata->local->scanning) { 2288 mutex_unlock(&sdata->local->mtx); 2289 goto out; 2290 } 2291 2292 if (beacon) { 2293 mlme_dbg_ratelimited(sdata, 2294 "detected beacon loss from AP (missed %d beacons) - probing\n", 2295 beacon_loss_count); 2296 2297 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2298 } 2299 2300 /* 2301 * The driver/our work has already reported this event or the 2302 * connection monitoring has kicked in and we have already sent 2303 * a probe request. Or maybe the AP died and the driver keeps 2304 * reporting until we disassociate... 2305 * 2306 * In either case we have to ignore the current call to this 2307 * function (except for setting the correct probe reason bit) 2308 * because otherwise we would reset the timer every time and 2309 * never check whether we received a probe response! 2310 */ 2311 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2312 already = true; 2313 2314 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2315 2316 mutex_unlock(&sdata->local->mtx); 2317 2318 if (already) 2319 goto out; 2320 2321 mutex_lock(&sdata->local->iflist_mtx); 2322 ieee80211_recalc_ps(sdata->local); 2323 mutex_unlock(&sdata->local->iflist_mtx); 2324 2325 ifmgd->probe_send_count = 0; 2326 ieee80211_mgd_probe_ap_send(sdata); 2327 out: 2328 sdata_unlock(sdata); 2329 } 2330 2331 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2332 struct ieee80211_vif *vif) 2333 { 2334 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2335 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2336 struct cfg80211_bss *cbss; 2337 struct sk_buff *skb; 2338 const u8 *ssid; 2339 int ssid_len; 2340 2341 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2342 return NULL; 2343 2344 sdata_assert_lock(sdata); 2345 2346 if (ifmgd->associated) 2347 cbss = ifmgd->associated; 2348 else if (ifmgd->auth_data) 2349 cbss = ifmgd->auth_data->bss; 2350 else if (ifmgd->assoc_data) 2351 cbss = ifmgd->assoc_data->bss; 2352 else 2353 return NULL; 2354 2355 rcu_read_lock(); 2356 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2357 if (WARN_ON_ONCE(ssid == NULL)) 2358 ssid_len = 0; 2359 else 2360 ssid_len = ssid[1]; 2361 2362 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2363 (u32) -1, cbss->channel, 2364 ssid + 2, ssid_len, 2365 NULL, 0, true); 2366 rcu_read_unlock(); 2367 2368 return skb; 2369 } 2370 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2371 2372 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2373 const u8 *buf, size_t len, bool tx, 2374 u16 reason) 2375 { 2376 struct ieee80211_event event = { 2377 .type = MLME_EVENT, 2378 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2379 .u.mlme.reason = reason, 2380 }; 2381 2382 if (tx) 2383 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2384 else 2385 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2386 2387 drv_event_callback(sdata->local, sdata, &event); 2388 } 2389 2390 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2391 { 2392 struct ieee80211_local *local = sdata->local; 2393 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2394 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2395 2396 sdata_lock(sdata); 2397 if (!ifmgd->associated) { 2398 sdata_unlock(sdata); 2399 return; 2400 } 2401 2402 /* AP is probably out of range (or not reachable for another reason) so 2403 * remove the bss struct for that AP. 2404 */ 2405 cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated); 2406 2407 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2408 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2409 true, frame_buf); 2410 mutex_lock(&local->mtx); 2411 sdata->vif.csa_active = false; 2412 ifmgd->csa_waiting_bcn = false; 2413 if (sdata->csa_block_tx) { 2414 ieee80211_wake_vif_queues(local, sdata, 2415 IEEE80211_QUEUE_STOP_REASON_CSA); 2416 sdata->csa_block_tx = false; 2417 } 2418 mutex_unlock(&local->mtx); 2419 2420 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2421 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2422 2423 sdata_unlock(sdata); 2424 } 2425 2426 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2427 { 2428 struct ieee80211_sub_if_data *sdata = 2429 container_of(work, struct ieee80211_sub_if_data, 2430 u.mgd.beacon_connection_loss_work); 2431 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2432 2433 if (ifmgd->associated) 2434 ifmgd->beacon_loss_count++; 2435 2436 if (ifmgd->connection_loss) { 2437 sdata_info(sdata, "Connection to AP %pM lost\n", 2438 ifmgd->bssid); 2439 __ieee80211_disconnect(sdata); 2440 } else { 2441 ieee80211_mgd_probe_ap(sdata, true); 2442 } 2443 } 2444 2445 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2446 { 2447 struct ieee80211_sub_if_data *sdata = 2448 container_of(work, struct ieee80211_sub_if_data, 2449 u.mgd.csa_connection_drop_work); 2450 2451 __ieee80211_disconnect(sdata); 2452 } 2453 2454 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2455 { 2456 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2457 struct ieee80211_hw *hw = &sdata->local->hw; 2458 2459 trace_api_beacon_loss(sdata); 2460 2461 sdata->u.mgd.connection_loss = false; 2462 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2463 } 2464 EXPORT_SYMBOL(ieee80211_beacon_loss); 2465 2466 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2467 { 2468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2469 struct ieee80211_hw *hw = &sdata->local->hw; 2470 2471 trace_api_connection_loss(sdata); 2472 2473 sdata->u.mgd.connection_loss = true; 2474 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2475 } 2476 EXPORT_SYMBOL(ieee80211_connection_loss); 2477 2478 2479 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2480 bool assoc) 2481 { 2482 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2483 2484 sdata_assert_lock(sdata); 2485 2486 if (!assoc) { 2487 /* 2488 * we are not authenticated yet, the only timer that could be 2489 * running is the timeout for the authentication response which 2490 * which is not relevant anymore. 2491 */ 2492 del_timer_sync(&sdata->u.mgd.timer); 2493 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2494 2495 eth_zero_addr(sdata->u.mgd.bssid); 2496 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2497 sdata->u.mgd.flags = 0; 2498 mutex_lock(&sdata->local->mtx); 2499 ieee80211_vif_release_channel(sdata); 2500 mutex_unlock(&sdata->local->mtx); 2501 } 2502 2503 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2504 kfree(auth_data); 2505 sdata->u.mgd.auth_data = NULL; 2506 } 2507 2508 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2509 bool assoc) 2510 { 2511 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2512 2513 sdata_assert_lock(sdata); 2514 2515 if (!assoc) { 2516 /* 2517 * we are not associated yet, the only timer that could be 2518 * running is the timeout for the association response which 2519 * which is not relevant anymore. 2520 */ 2521 del_timer_sync(&sdata->u.mgd.timer); 2522 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2523 2524 eth_zero_addr(sdata->u.mgd.bssid); 2525 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2526 sdata->u.mgd.flags = 0; 2527 sdata->vif.mu_mimo_owner = false; 2528 2529 mutex_lock(&sdata->local->mtx); 2530 ieee80211_vif_release_channel(sdata); 2531 mutex_unlock(&sdata->local->mtx); 2532 } 2533 2534 kfree(assoc_data); 2535 sdata->u.mgd.assoc_data = NULL; 2536 } 2537 2538 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2539 struct ieee80211_mgmt *mgmt, size_t len) 2540 { 2541 struct ieee80211_local *local = sdata->local; 2542 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2543 u8 *pos; 2544 struct ieee802_11_elems elems; 2545 u32 tx_flags = 0; 2546 2547 pos = mgmt->u.auth.variable; 2548 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2549 if (!elems.challenge) 2550 return; 2551 auth_data->expected_transaction = 4; 2552 drv_mgd_prepare_tx(sdata->local, sdata); 2553 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2554 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2555 IEEE80211_TX_INTFL_MLME_CONN_TX; 2556 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2557 elems.challenge - 2, elems.challenge_len + 2, 2558 auth_data->bss->bssid, auth_data->bss->bssid, 2559 auth_data->key, auth_data->key_len, 2560 auth_data->key_idx, tx_flags); 2561 } 2562 2563 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2564 struct ieee80211_mgmt *mgmt, size_t len) 2565 { 2566 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2567 u8 bssid[ETH_ALEN]; 2568 u16 auth_alg, auth_transaction, status_code; 2569 struct sta_info *sta; 2570 struct ieee80211_event event = { 2571 .type = MLME_EVENT, 2572 .u.mlme.data = AUTH_EVENT, 2573 }; 2574 2575 sdata_assert_lock(sdata); 2576 2577 if (len < 24 + 6) 2578 return; 2579 2580 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2581 return; 2582 2583 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2584 2585 if (!ether_addr_equal(bssid, mgmt->bssid)) 2586 return; 2587 2588 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2589 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2590 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2591 2592 if (auth_alg != ifmgd->auth_data->algorithm || 2593 auth_transaction != ifmgd->auth_data->expected_transaction) { 2594 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2595 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2596 auth_transaction, 2597 ifmgd->auth_data->expected_transaction); 2598 return; 2599 } 2600 2601 if (status_code != WLAN_STATUS_SUCCESS) { 2602 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2603 mgmt->sa, status_code); 2604 ieee80211_destroy_auth_data(sdata, false); 2605 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2606 event.u.mlme.status = MLME_DENIED; 2607 event.u.mlme.reason = status_code; 2608 drv_event_callback(sdata->local, sdata, &event); 2609 return; 2610 } 2611 2612 switch (ifmgd->auth_data->algorithm) { 2613 case WLAN_AUTH_OPEN: 2614 case WLAN_AUTH_LEAP: 2615 case WLAN_AUTH_FT: 2616 case WLAN_AUTH_SAE: 2617 break; 2618 case WLAN_AUTH_SHARED_KEY: 2619 if (ifmgd->auth_data->expected_transaction != 4) { 2620 ieee80211_auth_challenge(sdata, mgmt, len); 2621 /* need another frame */ 2622 return; 2623 } 2624 break; 2625 default: 2626 WARN_ONCE(1, "invalid auth alg %d", 2627 ifmgd->auth_data->algorithm); 2628 return; 2629 } 2630 2631 event.u.mlme.status = MLME_SUCCESS; 2632 drv_event_callback(sdata->local, sdata, &event); 2633 sdata_info(sdata, "authenticated\n"); 2634 ifmgd->auth_data->done = true; 2635 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2636 ifmgd->auth_data->timeout_started = true; 2637 run_again(sdata, ifmgd->auth_data->timeout); 2638 2639 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2640 ifmgd->auth_data->expected_transaction != 2) { 2641 /* 2642 * Report auth frame to user space for processing since another 2643 * round of Authentication frames is still needed. 2644 */ 2645 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2646 return; 2647 } 2648 2649 /* move station state to auth */ 2650 mutex_lock(&sdata->local->sta_mtx); 2651 sta = sta_info_get(sdata, bssid); 2652 if (!sta) { 2653 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2654 goto out_err; 2655 } 2656 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2657 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2658 goto out_err; 2659 } 2660 mutex_unlock(&sdata->local->sta_mtx); 2661 2662 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2663 return; 2664 out_err: 2665 mutex_unlock(&sdata->local->sta_mtx); 2666 /* ignore frame -- wait for timeout */ 2667 } 2668 2669 #define case_WLAN(type) \ 2670 case WLAN_REASON_##type: return #type 2671 2672 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2673 { 2674 switch (reason_code) { 2675 case_WLAN(UNSPECIFIED); 2676 case_WLAN(PREV_AUTH_NOT_VALID); 2677 case_WLAN(DEAUTH_LEAVING); 2678 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2679 case_WLAN(DISASSOC_AP_BUSY); 2680 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2681 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2682 case_WLAN(DISASSOC_STA_HAS_LEFT); 2683 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2684 case_WLAN(DISASSOC_BAD_POWER); 2685 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2686 case_WLAN(INVALID_IE); 2687 case_WLAN(MIC_FAILURE); 2688 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2689 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2690 case_WLAN(IE_DIFFERENT); 2691 case_WLAN(INVALID_GROUP_CIPHER); 2692 case_WLAN(INVALID_PAIRWISE_CIPHER); 2693 case_WLAN(INVALID_AKMP); 2694 case_WLAN(UNSUPP_RSN_VERSION); 2695 case_WLAN(INVALID_RSN_IE_CAP); 2696 case_WLAN(IEEE8021X_FAILED); 2697 case_WLAN(CIPHER_SUITE_REJECTED); 2698 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2699 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2700 case_WLAN(DISASSOC_LOW_ACK); 2701 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2702 case_WLAN(QSTA_LEAVE_QBSS); 2703 case_WLAN(QSTA_NOT_USE); 2704 case_WLAN(QSTA_REQUIRE_SETUP); 2705 case_WLAN(QSTA_TIMEOUT); 2706 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2707 case_WLAN(MESH_PEER_CANCELED); 2708 case_WLAN(MESH_MAX_PEERS); 2709 case_WLAN(MESH_CONFIG); 2710 case_WLAN(MESH_CLOSE); 2711 case_WLAN(MESH_MAX_RETRIES); 2712 case_WLAN(MESH_CONFIRM_TIMEOUT); 2713 case_WLAN(MESH_INVALID_GTK); 2714 case_WLAN(MESH_INCONSISTENT_PARAM); 2715 case_WLAN(MESH_INVALID_SECURITY); 2716 case_WLAN(MESH_PATH_ERROR); 2717 case_WLAN(MESH_PATH_NOFORWARD); 2718 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2719 case_WLAN(MAC_EXISTS_IN_MBSS); 2720 case_WLAN(MESH_CHAN_REGULATORY); 2721 case_WLAN(MESH_CHAN); 2722 default: return "<unknown>"; 2723 } 2724 } 2725 2726 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2727 struct ieee80211_mgmt *mgmt, size_t len) 2728 { 2729 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2730 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2731 2732 sdata_assert_lock(sdata); 2733 2734 if (len < 24 + 2) 2735 return; 2736 2737 if (ifmgd->associated && 2738 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2739 const u8 *bssid = ifmgd->associated->bssid; 2740 2741 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2742 bssid, reason_code, 2743 ieee80211_get_reason_code_string(reason_code)); 2744 2745 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2746 2747 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2748 reason_code); 2749 return; 2750 } 2751 2752 if (ifmgd->assoc_data && 2753 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2754 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2755 2756 sdata_info(sdata, 2757 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2758 bssid, reason_code, 2759 ieee80211_get_reason_code_string(reason_code)); 2760 2761 ieee80211_destroy_assoc_data(sdata, false); 2762 2763 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2764 return; 2765 } 2766 } 2767 2768 2769 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2770 struct ieee80211_mgmt *mgmt, size_t len) 2771 { 2772 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2773 u16 reason_code; 2774 2775 sdata_assert_lock(sdata); 2776 2777 if (len < 24 + 2) 2778 return; 2779 2780 if (!ifmgd->associated || 2781 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2782 return; 2783 2784 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2785 2786 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2787 mgmt->sa, reason_code); 2788 2789 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2790 2791 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2792 } 2793 2794 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2795 u8 *supp_rates, unsigned int supp_rates_len, 2796 u32 *rates, u32 *basic_rates, 2797 bool *have_higher_than_11mbit, 2798 int *min_rate, int *min_rate_index, 2799 int shift, u32 rate_flags) 2800 { 2801 int i, j; 2802 2803 for (i = 0; i < supp_rates_len; i++) { 2804 int rate = supp_rates[i] & 0x7f; 2805 bool is_basic = !!(supp_rates[i] & 0x80); 2806 2807 if ((rate * 5 * (1 << shift)) > 110) 2808 *have_higher_than_11mbit = true; 2809 2810 /* 2811 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2812 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2813 * 2814 * Note: Even through the membership selector and the basic 2815 * rate flag share the same bit, they are not exactly 2816 * the same. 2817 */ 2818 if (!!(supp_rates[i] & 0x80) && 2819 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2820 continue; 2821 2822 for (j = 0; j < sband->n_bitrates; j++) { 2823 struct ieee80211_rate *br; 2824 int brate; 2825 2826 br = &sband->bitrates[j]; 2827 if ((rate_flags & br->flags) != rate_flags) 2828 continue; 2829 2830 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2831 if (brate == rate) { 2832 *rates |= BIT(j); 2833 if (is_basic) 2834 *basic_rates |= BIT(j); 2835 if ((rate * 5) < *min_rate) { 2836 *min_rate = rate * 5; 2837 *min_rate_index = j; 2838 } 2839 break; 2840 } 2841 } 2842 } 2843 } 2844 2845 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2846 struct cfg80211_bss *cbss, 2847 struct ieee80211_mgmt *mgmt, size_t len) 2848 { 2849 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2850 struct ieee80211_local *local = sdata->local; 2851 struct ieee80211_supported_band *sband; 2852 struct sta_info *sta; 2853 u8 *pos; 2854 u16 capab_info, aid; 2855 struct ieee802_11_elems elems; 2856 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2857 const struct cfg80211_bss_ies *bss_ies = NULL; 2858 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2859 u32 changed = 0; 2860 int err; 2861 bool ret; 2862 2863 /* AssocResp and ReassocResp have identical structure */ 2864 2865 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2866 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2867 2868 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2869 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2870 aid); 2871 aid &= ~(BIT(15) | BIT(14)); 2872 2873 ifmgd->broken_ap = false; 2874 2875 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2876 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2877 aid); 2878 aid = 0; 2879 ifmgd->broken_ap = true; 2880 } 2881 2882 pos = mgmt->u.assoc_resp.variable; 2883 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2884 2885 if (!elems.supp_rates) { 2886 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2887 return false; 2888 } 2889 2890 ifmgd->aid = aid; 2891 ifmgd->tdls_chan_switch_prohibited = 2892 elems.ext_capab && elems.ext_capab_len >= 5 && 2893 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2894 2895 /* 2896 * Some APs are erroneously not including some information in their 2897 * (re)association response frames. Try to recover by using the data 2898 * from the beacon or probe response. This seems to afflict mobile 2899 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2900 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2901 */ 2902 if ((assoc_data->wmm && !elems.wmm_param) || 2903 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2904 (!elems.ht_cap_elem || !elems.ht_operation)) || 2905 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2906 (!elems.vht_cap_elem || !elems.vht_operation))) { 2907 const struct cfg80211_bss_ies *ies; 2908 struct ieee802_11_elems bss_elems; 2909 2910 rcu_read_lock(); 2911 ies = rcu_dereference(cbss->ies); 2912 if (ies) 2913 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2914 GFP_ATOMIC); 2915 rcu_read_unlock(); 2916 if (!bss_ies) 2917 return false; 2918 2919 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2920 false, &bss_elems); 2921 if (assoc_data->wmm && 2922 !elems.wmm_param && bss_elems.wmm_param) { 2923 elems.wmm_param = bss_elems.wmm_param; 2924 sdata_info(sdata, 2925 "AP bug: WMM param missing from AssocResp\n"); 2926 } 2927 2928 /* 2929 * Also check if we requested HT/VHT, otherwise the AP doesn't 2930 * have to include the IEs in the (re)association response. 2931 */ 2932 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2933 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2934 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2935 sdata_info(sdata, 2936 "AP bug: HT capability missing from AssocResp\n"); 2937 } 2938 if (!elems.ht_operation && bss_elems.ht_operation && 2939 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2940 elems.ht_operation = bss_elems.ht_operation; 2941 sdata_info(sdata, 2942 "AP bug: HT operation missing from AssocResp\n"); 2943 } 2944 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2945 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2946 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2947 sdata_info(sdata, 2948 "AP bug: VHT capa missing from AssocResp\n"); 2949 } 2950 if (!elems.vht_operation && bss_elems.vht_operation && 2951 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2952 elems.vht_operation = bss_elems.vht_operation; 2953 sdata_info(sdata, 2954 "AP bug: VHT operation missing from AssocResp\n"); 2955 } 2956 } 2957 2958 /* 2959 * We previously checked these in the beacon/probe response, so 2960 * they should be present here. This is just a safety net. 2961 */ 2962 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2963 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2964 sdata_info(sdata, 2965 "HT AP is missing WMM params or HT capability/operation\n"); 2966 ret = false; 2967 goto out; 2968 } 2969 2970 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2971 (!elems.vht_cap_elem || !elems.vht_operation)) { 2972 sdata_info(sdata, 2973 "VHT AP is missing VHT capability/operation\n"); 2974 ret = false; 2975 goto out; 2976 } 2977 2978 mutex_lock(&sdata->local->sta_mtx); 2979 /* 2980 * station info was already allocated and inserted before 2981 * the association and should be available to us 2982 */ 2983 sta = sta_info_get(sdata, cbss->bssid); 2984 if (WARN_ON(!sta)) { 2985 mutex_unlock(&sdata->local->sta_mtx); 2986 ret = false; 2987 goto out; 2988 } 2989 2990 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2991 2992 /* Set up internal HT/VHT capabilities */ 2993 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2994 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2995 elems.ht_cap_elem, sta); 2996 2997 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 2998 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 2999 elems.vht_cap_elem, sta); 3000 3001 /* 3002 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3003 * in their association response, so ignore that data for our own 3004 * configuration. If it changed since the last beacon, we'll get the 3005 * next beacon and update then. 3006 */ 3007 3008 /* 3009 * If an operating mode notification IE is present, override the 3010 * NSS calculation (that would be done in rate_control_rate_init()) 3011 * and use the # of streams from that element. 3012 */ 3013 if (elems.opmode_notif && 3014 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3015 u8 nss; 3016 3017 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3018 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3019 nss += 1; 3020 sta->sta.rx_nss = nss; 3021 } 3022 3023 rate_control_rate_init(sta); 3024 3025 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3026 set_sta_flag(sta, WLAN_STA_MFP); 3027 sta->sta.mfp = true; 3028 } else { 3029 sta->sta.mfp = false; 3030 } 3031 3032 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3033 3034 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3035 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3036 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3037 if (err) { 3038 sdata_info(sdata, 3039 "failed to move station %pM to desired state\n", 3040 sta->sta.addr); 3041 WARN_ON(__sta_info_destroy(sta)); 3042 mutex_unlock(&sdata->local->sta_mtx); 3043 ret = false; 3044 goto out; 3045 } 3046 3047 mutex_unlock(&sdata->local->sta_mtx); 3048 3049 /* 3050 * Always handle WMM once after association regardless 3051 * of the first value the AP uses. Setting -1 here has 3052 * that effect because the AP values is an unsigned 3053 * 4-bit value. 3054 */ 3055 ifmgd->wmm_last_param_set = -1; 3056 3057 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3058 ieee80211_set_wmm_default(sdata, false, false); 3059 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3060 elems.wmm_param_len)) { 3061 /* still enable QoS since we might have HT/VHT */ 3062 ieee80211_set_wmm_default(sdata, false, true); 3063 /* set the disable-WMM flag in this case to disable 3064 * tracking WMM parameter changes in the beacon if 3065 * the parameters weren't actually valid. Doing so 3066 * avoids changing parameters very strangely when 3067 * the AP is going back and forth between valid and 3068 * invalid parameters. 3069 */ 3070 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3071 } 3072 changed |= BSS_CHANGED_QOS; 3073 3074 /* set AID and assoc capability, 3075 * ieee80211_set_associated() will tell the driver */ 3076 bss_conf->aid = aid; 3077 bss_conf->assoc_capability = capab_info; 3078 ieee80211_set_associated(sdata, cbss, changed); 3079 3080 /* 3081 * If we're using 4-addr mode, let the AP know that we're 3082 * doing so, so that it can create the STA VLAN on its side 3083 */ 3084 if (ifmgd->use_4addr) 3085 ieee80211_send_4addr_nullfunc(local, sdata); 3086 3087 /* 3088 * Start timer to probe the connection to the AP now. 3089 * Also start the timer that will detect beacon loss. 3090 */ 3091 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3092 ieee80211_sta_reset_beacon_monitor(sdata); 3093 3094 ret = true; 3095 out: 3096 kfree(bss_ies); 3097 return ret; 3098 } 3099 3100 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3101 struct ieee80211_mgmt *mgmt, 3102 size_t len) 3103 { 3104 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3105 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3106 u16 capab_info, status_code, aid; 3107 struct ieee802_11_elems elems; 3108 int ac, uapsd_queues = -1; 3109 u8 *pos; 3110 bool reassoc; 3111 struct cfg80211_bss *bss; 3112 struct ieee80211_event event = { 3113 .type = MLME_EVENT, 3114 .u.mlme.data = ASSOC_EVENT, 3115 }; 3116 3117 sdata_assert_lock(sdata); 3118 3119 if (!assoc_data) 3120 return; 3121 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3122 return; 3123 3124 /* 3125 * AssocResp and ReassocResp have identical structure, so process both 3126 * of them in this function. 3127 */ 3128 3129 if (len < 24 + 6) 3130 return; 3131 3132 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3133 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3134 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3135 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3136 3137 sdata_info(sdata, 3138 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3139 reassoc ? "Rea" : "A", mgmt->sa, 3140 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3141 3142 pos = mgmt->u.assoc_resp.variable; 3143 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3144 3145 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3146 elems.timeout_int && 3147 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3148 u32 tu, ms; 3149 tu = le32_to_cpu(elems.timeout_int->value); 3150 ms = tu * 1024 / 1000; 3151 sdata_info(sdata, 3152 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3153 mgmt->sa, tu, ms); 3154 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3155 assoc_data->timeout_started = true; 3156 if (ms > IEEE80211_ASSOC_TIMEOUT) 3157 run_again(sdata, assoc_data->timeout); 3158 return; 3159 } 3160 3161 bss = assoc_data->bss; 3162 3163 if (status_code != WLAN_STATUS_SUCCESS) { 3164 sdata_info(sdata, "%pM denied association (code=%d)\n", 3165 mgmt->sa, status_code); 3166 ieee80211_destroy_assoc_data(sdata, false); 3167 event.u.mlme.status = MLME_DENIED; 3168 event.u.mlme.reason = status_code; 3169 drv_event_callback(sdata->local, sdata, &event); 3170 } else { 3171 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3172 /* oops -- internal error -- send timeout for now */ 3173 ieee80211_destroy_assoc_data(sdata, false); 3174 cfg80211_assoc_timeout(sdata->dev, bss); 3175 return; 3176 } 3177 event.u.mlme.status = MLME_SUCCESS; 3178 drv_event_callback(sdata->local, sdata, &event); 3179 sdata_info(sdata, "associated\n"); 3180 3181 /* 3182 * destroy assoc_data afterwards, as otherwise an idle 3183 * recalc after assoc_data is NULL but before associated 3184 * is set can cause the interface to go idle 3185 */ 3186 ieee80211_destroy_assoc_data(sdata, true); 3187 3188 /* get uapsd queues configuration */ 3189 uapsd_queues = 0; 3190 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3191 if (sdata->tx_conf[ac].uapsd) 3192 uapsd_queues |= BIT(ac); 3193 } 3194 3195 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3196 } 3197 3198 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3199 struct ieee80211_mgmt *mgmt, size_t len, 3200 struct ieee80211_rx_status *rx_status, 3201 struct ieee802_11_elems *elems) 3202 { 3203 struct ieee80211_local *local = sdata->local; 3204 struct ieee80211_bss *bss; 3205 struct ieee80211_channel *channel; 3206 3207 sdata_assert_lock(sdata); 3208 3209 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3210 if (!channel) 3211 return; 3212 3213 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3214 channel); 3215 if (bss) { 3216 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3217 ieee80211_rx_bss_put(local, bss); 3218 } 3219 } 3220 3221 3222 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3223 struct sk_buff *skb) 3224 { 3225 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3226 struct ieee80211_if_managed *ifmgd; 3227 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3228 size_t baselen, len = skb->len; 3229 struct ieee802_11_elems elems; 3230 3231 ifmgd = &sdata->u.mgd; 3232 3233 sdata_assert_lock(sdata); 3234 3235 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3236 return; /* ignore ProbeResp to foreign address */ 3237 3238 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3239 if (baselen > len) 3240 return; 3241 3242 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3243 false, &elems); 3244 3245 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3246 3247 if (ifmgd->associated && 3248 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3249 ieee80211_reset_ap_probe(sdata); 3250 } 3251 3252 /* 3253 * This is the canonical list of information elements we care about, 3254 * the filter code also gives us all changes to the Microsoft OUI 3255 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3256 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3257 * changes to requested client power. 3258 * 3259 * We implement beacon filtering in software since that means we can 3260 * avoid processing the frame here and in cfg80211, and userspace 3261 * will not be able to tell whether the hardware supports it or not. 3262 * 3263 * XXX: This list needs to be dynamic -- userspace needs to be able to 3264 * add items it requires. It also needs to be able to tell us to 3265 * look out for other vendor IEs. 3266 */ 3267 static const u64 care_about_ies = 3268 (1ULL << WLAN_EID_COUNTRY) | 3269 (1ULL << WLAN_EID_ERP_INFO) | 3270 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3271 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3272 (1ULL << WLAN_EID_HT_CAPABILITY) | 3273 (1ULL << WLAN_EID_HT_OPERATION) | 3274 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3275 3276 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3277 struct ieee80211_mgmt *mgmt, size_t len, 3278 struct ieee80211_rx_status *rx_status) 3279 { 3280 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3281 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3282 size_t baselen; 3283 struct ieee802_11_elems elems; 3284 struct ieee80211_local *local = sdata->local; 3285 struct ieee80211_chanctx_conf *chanctx_conf; 3286 struct ieee80211_channel *chan; 3287 struct sta_info *sta; 3288 u32 changed = 0; 3289 bool erp_valid; 3290 u8 erp_value = 0; 3291 u32 ncrc; 3292 u8 *bssid; 3293 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3294 3295 sdata_assert_lock(sdata); 3296 3297 /* Process beacon from the current BSS */ 3298 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3299 if (baselen > len) 3300 return; 3301 3302 rcu_read_lock(); 3303 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3304 if (!chanctx_conf) { 3305 rcu_read_unlock(); 3306 return; 3307 } 3308 3309 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3310 rcu_read_unlock(); 3311 return; 3312 } 3313 chan = chanctx_conf->def.chan; 3314 rcu_read_unlock(); 3315 3316 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3317 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3318 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3319 len - baselen, false, &elems); 3320 3321 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3322 if (elems.tim && !elems.parse_error) { 3323 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3324 ifmgd->dtim_period = tim_ie->dtim_period; 3325 } 3326 ifmgd->have_beacon = true; 3327 ifmgd->assoc_data->need_beacon = false; 3328 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3329 sdata->vif.bss_conf.sync_tsf = 3330 le64_to_cpu(mgmt->u.beacon.timestamp); 3331 sdata->vif.bss_conf.sync_device_ts = 3332 rx_status->device_timestamp; 3333 if (elems.tim) 3334 sdata->vif.bss_conf.sync_dtim_count = 3335 elems.tim->dtim_count; 3336 else 3337 sdata->vif.bss_conf.sync_dtim_count = 0; 3338 } 3339 /* continue assoc process */ 3340 ifmgd->assoc_data->timeout = jiffies; 3341 ifmgd->assoc_data->timeout_started = true; 3342 run_again(sdata, ifmgd->assoc_data->timeout); 3343 return; 3344 } 3345 3346 if (!ifmgd->associated || 3347 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3348 return; 3349 bssid = ifmgd->associated->bssid; 3350 3351 /* Track average RSSI from the Beacon frames of the current AP */ 3352 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3353 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3354 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3355 ifmgd->last_cqm_event_signal = 0; 3356 ifmgd->count_beacon_signal = 1; 3357 ifmgd->last_ave_beacon_signal = 0; 3358 } else { 3359 ifmgd->count_beacon_signal++; 3360 } 3361 3362 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3363 3364 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3365 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3366 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3367 int last_sig = ifmgd->last_ave_beacon_signal; 3368 struct ieee80211_event event = { 3369 .type = RSSI_EVENT, 3370 }; 3371 3372 /* 3373 * if signal crosses either of the boundaries, invoke callback 3374 * with appropriate parameters 3375 */ 3376 if (sig > ifmgd->rssi_max_thold && 3377 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3378 ifmgd->last_ave_beacon_signal = sig; 3379 event.u.rssi.data = RSSI_EVENT_HIGH; 3380 drv_event_callback(local, sdata, &event); 3381 } else if (sig < ifmgd->rssi_min_thold && 3382 (last_sig >= ifmgd->rssi_max_thold || 3383 last_sig == 0)) { 3384 ifmgd->last_ave_beacon_signal = sig; 3385 event.u.rssi.data = RSSI_EVENT_LOW; 3386 drv_event_callback(local, sdata, &event); 3387 } 3388 } 3389 3390 if (bss_conf->cqm_rssi_thold && 3391 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3392 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3393 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3394 int last_event = ifmgd->last_cqm_event_signal; 3395 int thold = bss_conf->cqm_rssi_thold; 3396 int hyst = bss_conf->cqm_rssi_hyst; 3397 3398 if (sig < thold && 3399 (last_event == 0 || sig < last_event - hyst)) { 3400 ifmgd->last_cqm_event_signal = sig; 3401 ieee80211_cqm_rssi_notify( 3402 &sdata->vif, 3403 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3404 GFP_KERNEL); 3405 } else if (sig > thold && 3406 (last_event == 0 || sig > last_event + hyst)) { 3407 ifmgd->last_cqm_event_signal = sig; 3408 ieee80211_cqm_rssi_notify( 3409 &sdata->vif, 3410 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3411 GFP_KERNEL); 3412 } 3413 } 3414 3415 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3416 mlme_dbg_ratelimited(sdata, 3417 "cancelling AP probe due to a received beacon\n"); 3418 ieee80211_reset_ap_probe(sdata); 3419 } 3420 3421 /* 3422 * Push the beacon loss detection into the future since 3423 * we are processing a beacon from the AP just now. 3424 */ 3425 ieee80211_sta_reset_beacon_monitor(sdata); 3426 3427 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3428 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3429 len - baselen, false, &elems, 3430 care_about_ies, ncrc); 3431 3432 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3433 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3434 if (local->hw.conf.dynamic_ps_timeout > 0) { 3435 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3436 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3437 ieee80211_hw_config(local, 3438 IEEE80211_CONF_CHANGE_PS); 3439 } 3440 ieee80211_send_nullfunc(local, sdata, false); 3441 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3442 local->pspolling = true; 3443 3444 /* 3445 * Here is assumed that the driver will be 3446 * able to send ps-poll frame and receive a 3447 * response even though power save mode is 3448 * enabled, but some drivers might require 3449 * to disable power save here. This needs 3450 * to be investigated. 3451 */ 3452 ieee80211_send_pspoll(local, sdata); 3453 } 3454 } 3455 3456 if (sdata->vif.p2p || 3457 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3458 struct ieee80211_p2p_noa_attr noa = {}; 3459 int ret; 3460 3461 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3462 len - baselen, 3463 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3464 (u8 *) &noa, sizeof(noa)); 3465 if (ret >= 2) { 3466 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3467 /* valid noa_attr and index changed */ 3468 sdata->u.mgd.p2p_noa_index = noa.index; 3469 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3470 changed |= BSS_CHANGED_P2P_PS; 3471 /* 3472 * make sure we update all information, the CRC 3473 * mechanism doesn't look at P2P attributes. 3474 */ 3475 ifmgd->beacon_crc_valid = false; 3476 } 3477 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3478 /* noa_attr not found and we had valid noa_attr before */ 3479 sdata->u.mgd.p2p_noa_index = -1; 3480 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3481 changed |= BSS_CHANGED_P2P_PS; 3482 ifmgd->beacon_crc_valid = false; 3483 } 3484 } 3485 3486 if (ifmgd->csa_waiting_bcn) 3487 ieee80211_chswitch_post_beacon(sdata); 3488 3489 /* 3490 * Update beacon timing and dtim count on every beacon appearance. This 3491 * will allow the driver to use the most updated values. Do it before 3492 * comparing this one with last received beacon. 3493 * IMPORTANT: These parameters would possibly be out of sync by the time 3494 * the driver will use them. The synchronized view is currently 3495 * guaranteed only in certain callbacks. 3496 */ 3497 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3498 sdata->vif.bss_conf.sync_tsf = 3499 le64_to_cpu(mgmt->u.beacon.timestamp); 3500 sdata->vif.bss_conf.sync_device_ts = 3501 rx_status->device_timestamp; 3502 if (elems.tim) 3503 sdata->vif.bss_conf.sync_dtim_count = 3504 elems.tim->dtim_count; 3505 else 3506 sdata->vif.bss_conf.sync_dtim_count = 0; 3507 } 3508 3509 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3510 return; 3511 ifmgd->beacon_crc = ncrc; 3512 ifmgd->beacon_crc_valid = true; 3513 3514 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3515 3516 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3517 rx_status->device_timestamp, 3518 &elems, true); 3519 3520 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3521 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3522 elems.wmm_param_len)) 3523 changed |= BSS_CHANGED_QOS; 3524 3525 /* 3526 * If we haven't had a beacon before, tell the driver about the 3527 * DTIM period (and beacon timing if desired) now. 3528 */ 3529 if (!ifmgd->have_beacon) { 3530 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3531 if (elems.tim) 3532 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3533 else 3534 bss_conf->dtim_period = 1; 3535 3536 changed |= BSS_CHANGED_BEACON_INFO; 3537 ifmgd->have_beacon = true; 3538 3539 mutex_lock(&local->iflist_mtx); 3540 ieee80211_recalc_ps(local); 3541 mutex_unlock(&local->iflist_mtx); 3542 3543 ieee80211_recalc_ps_vif(sdata); 3544 } 3545 3546 if (elems.erp_info) { 3547 erp_valid = true; 3548 erp_value = elems.erp_info[0]; 3549 } else { 3550 erp_valid = false; 3551 } 3552 changed |= ieee80211_handle_bss_capability(sdata, 3553 le16_to_cpu(mgmt->u.beacon.capab_info), 3554 erp_valid, erp_value); 3555 3556 mutex_lock(&local->sta_mtx); 3557 sta = sta_info_get(sdata, bssid); 3558 3559 if (ieee80211_config_bw(sdata, sta, 3560 elems.ht_cap_elem, elems.ht_operation, 3561 elems.vht_operation, bssid, &changed)) { 3562 mutex_unlock(&local->sta_mtx); 3563 sdata_info(sdata, 3564 "failed to follow AP %pM bandwidth change, disconnect\n", 3565 bssid); 3566 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3567 WLAN_REASON_DEAUTH_LEAVING, 3568 true, deauth_buf); 3569 ieee80211_report_disconnect(sdata, deauth_buf, 3570 sizeof(deauth_buf), true, 3571 WLAN_REASON_DEAUTH_LEAVING); 3572 return; 3573 } 3574 3575 if (sta && elems.opmode_notif) 3576 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3577 rx_status->band); 3578 mutex_unlock(&local->sta_mtx); 3579 3580 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3581 elems.country_elem, 3582 elems.country_elem_len, 3583 elems.pwr_constr_elem, 3584 elems.cisco_dtpc_elem); 3585 3586 ieee80211_bss_info_change_notify(sdata, changed); 3587 } 3588 3589 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3590 struct sk_buff *skb) 3591 { 3592 struct ieee80211_rx_status *rx_status; 3593 struct ieee80211_mgmt *mgmt; 3594 u16 fc; 3595 struct ieee802_11_elems elems; 3596 int ies_len; 3597 3598 rx_status = (struct ieee80211_rx_status *) skb->cb; 3599 mgmt = (struct ieee80211_mgmt *) skb->data; 3600 fc = le16_to_cpu(mgmt->frame_control); 3601 3602 sdata_lock(sdata); 3603 3604 switch (fc & IEEE80211_FCTL_STYPE) { 3605 case IEEE80211_STYPE_BEACON: 3606 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3607 break; 3608 case IEEE80211_STYPE_PROBE_RESP: 3609 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3610 break; 3611 case IEEE80211_STYPE_AUTH: 3612 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3613 break; 3614 case IEEE80211_STYPE_DEAUTH: 3615 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3616 break; 3617 case IEEE80211_STYPE_DISASSOC: 3618 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3619 break; 3620 case IEEE80211_STYPE_ASSOC_RESP: 3621 case IEEE80211_STYPE_REASSOC_RESP: 3622 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3623 break; 3624 case IEEE80211_STYPE_ACTION: 3625 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3626 ies_len = skb->len - 3627 offsetof(struct ieee80211_mgmt, 3628 u.action.u.chan_switch.variable); 3629 3630 if (ies_len < 0) 3631 break; 3632 3633 ieee802_11_parse_elems( 3634 mgmt->u.action.u.chan_switch.variable, 3635 ies_len, true, &elems); 3636 3637 if (elems.parse_error) 3638 break; 3639 3640 ieee80211_sta_process_chanswitch(sdata, 3641 rx_status->mactime, 3642 rx_status->device_timestamp, 3643 &elems, false); 3644 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3645 ies_len = skb->len - 3646 offsetof(struct ieee80211_mgmt, 3647 u.action.u.ext_chan_switch.variable); 3648 3649 if (ies_len < 0) 3650 break; 3651 3652 ieee802_11_parse_elems( 3653 mgmt->u.action.u.ext_chan_switch.variable, 3654 ies_len, true, &elems); 3655 3656 if (elems.parse_error) 3657 break; 3658 3659 /* for the handling code pretend this was also an IE */ 3660 elems.ext_chansw_ie = 3661 &mgmt->u.action.u.ext_chan_switch.data; 3662 3663 ieee80211_sta_process_chanswitch(sdata, 3664 rx_status->mactime, 3665 rx_status->device_timestamp, 3666 &elems, false); 3667 } 3668 break; 3669 } 3670 sdata_unlock(sdata); 3671 } 3672 3673 static void ieee80211_sta_timer(unsigned long data) 3674 { 3675 struct ieee80211_sub_if_data *sdata = 3676 (struct ieee80211_sub_if_data *) data; 3677 3678 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3679 } 3680 3681 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3682 u8 *bssid, u8 reason, bool tx) 3683 { 3684 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3685 3686 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3687 tx, frame_buf); 3688 3689 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3690 reason); 3691 } 3692 3693 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3694 { 3695 struct ieee80211_local *local = sdata->local; 3696 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3697 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3698 u32 tx_flags = 0; 3699 u16 trans = 1; 3700 u16 status = 0; 3701 3702 sdata_assert_lock(sdata); 3703 3704 if (WARN_ON_ONCE(!auth_data)) 3705 return -EINVAL; 3706 3707 auth_data->tries++; 3708 3709 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3710 sdata_info(sdata, "authentication with %pM timed out\n", 3711 auth_data->bss->bssid); 3712 3713 /* 3714 * Most likely AP is not in the range so remove the 3715 * bss struct for that AP. 3716 */ 3717 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3718 3719 return -ETIMEDOUT; 3720 } 3721 3722 drv_mgd_prepare_tx(local, sdata); 3723 3724 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3725 auth_data->bss->bssid, auth_data->tries, 3726 IEEE80211_AUTH_MAX_TRIES); 3727 3728 auth_data->expected_transaction = 2; 3729 3730 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3731 trans = auth_data->sae_trans; 3732 status = auth_data->sae_status; 3733 auth_data->expected_transaction = trans; 3734 } 3735 3736 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3737 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3738 IEEE80211_TX_INTFL_MLME_CONN_TX; 3739 3740 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3741 auth_data->data, auth_data->data_len, 3742 auth_data->bss->bssid, 3743 auth_data->bss->bssid, NULL, 0, 0, 3744 tx_flags); 3745 3746 if (tx_flags == 0) { 3747 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3748 auth_data->timeout_started = true; 3749 run_again(sdata, auth_data->timeout); 3750 } else { 3751 auth_data->timeout = 3752 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3753 auth_data->timeout_started = true; 3754 run_again(sdata, auth_data->timeout); 3755 } 3756 3757 return 0; 3758 } 3759 3760 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3761 { 3762 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3763 struct ieee80211_local *local = sdata->local; 3764 3765 sdata_assert_lock(sdata); 3766 3767 assoc_data->tries++; 3768 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3769 sdata_info(sdata, "association with %pM timed out\n", 3770 assoc_data->bss->bssid); 3771 3772 /* 3773 * Most likely AP is not in the range so remove the 3774 * bss struct for that AP. 3775 */ 3776 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3777 3778 return -ETIMEDOUT; 3779 } 3780 3781 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3782 assoc_data->bss->bssid, assoc_data->tries, 3783 IEEE80211_ASSOC_MAX_TRIES); 3784 ieee80211_send_assoc(sdata); 3785 3786 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3787 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3788 assoc_data->timeout_started = true; 3789 run_again(sdata, assoc_data->timeout); 3790 } else { 3791 assoc_data->timeout = 3792 round_jiffies_up(jiffies + 3793 IEEE80211_ASSOC_TIMEOUT_LONG); 3794 assoc_data->timeout_started = true; 3795 run_again(sdata, assoc_data->timeout); 3796 } 3797 3798 return 0; 3799 } 3800 3801 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3802 __le16 fc, bool acked) 3803 { 3804 struct ieee80211_local *local = sdata->local; 3805 3806 sdata->u.mgd.status_fc = fc; 3807 sdata->u.mgd.status_acked = acked; 3808 sdata->u.mgd.status_received = true; 3809 3810 ieee80211_queue_work(&local->hw, &sdata->work); 3811 } 3812 3813 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3814 { 3815 struct ieee80211_local *local = sdata->local; 3816 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3817 3818 sdata_lock(sdata); 3819 3820 if (ifmgd->status_received) { 3821 __le16 fc = ifmgd->status_fc; 3822 bool status_acked = ifmgd->status_acked; 3823 3824 ifmgd->status_received = false; 3825 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3826 if (status_acked) { 3827 ifmgd->auth_data->timeout = 3828 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3829 run_again(sdata, ifmgd->auth_data->timeout); 3830 } else { 3831 ifmgd->auth_data->timeout = jiffies - 1; 3832 } 3833 ifmgd->auth_data->timeout_started = true; 3834 } else if (ifmgd->assoc_data && 3835 (ieee80211_is_assoc_req(fc) || 3836 ieee80211_is_reassoc_req(fc))) { 3837 if (status_acked) { 3838 ifmgd->assoc_data->timeout = 3839 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3840 run_again(sdata, ifmgd->assoc_data->timeout); 3841 } else { 3842 ifmgd->assoc_data->timeout = jiffies - 1; 3843 } 3844 ifmgd->assoc_data->timeout_started = true; 3845 } 3846 } 3847 3848 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3849 time_after(jiffies, ifmgd->auth_data->timeout)) { 3850 if (ifmgd->auth_data->done) { 3851 /* 3852 * ok ... we waited for assoc but userspace didn't, 3853 * so let's just kill the auth data 3854 */ 3855 ieee80211_destroy_auth_data(sdata, false); 3856 } else if (ieee80211_auth(sdata)) { 3857 u8 bssid[ETH_ALEN]; 3858 struct ieee80211_event event = { 3859 .type = MLME_EVENT, 3860 .u.mlme.data = AUTH_EVENT, 3861 .u.mlme.status = MLME_TIMEOUT, 3862 }; 3863 3864 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3865 3866 ieee80211_destroy_auth_data(sdata, false); 3867 3868 cfg80211_auth_timeout(sdata->dev, bssid); 3869 drv_event_callback(sdata->local, sdata, &event); 3870 } 3871 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3872 run_again(sdata, ifmgd->auth_data->timeout); 3873 3874 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3875 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3876 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3877 ieee80211_do_assoc(sdata)) { 3878 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3879 struct ieee80211_event event = { 3880 .type = MLME_EVENT, 3881 .u.mlme.data = ASSOC_EVENT, 3882 .u.mlme.status = MLME_TIMEOUT, 3883 }; 3884 3885 ieee80211_destroy_assoc_data(sdata, false); 3886 cfg80211_assoc_timeout(sdata->dev, bss); 3887 drv_event_callback(sdata->local, sdata, &event); 3888 } 3889 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3890 run_again(sdata, ifmgd->assoc_data->timeout); 3891 3892 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3893 ifmgd->associated) { 3894 u8 bssid[ETH_ALEN]; 3895 int max_tries; 3896 3897 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3898 3899 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3900 max_tries = max_nullfunc_tries; 3901 else 3902 max_tries = max_probe_tries; 3903 3904 /* ACK received for nullfunc probing frame */ 3905 if (!ifmgd->probe_send_count) 3906 ieee80211_reset_ap_probe(sdata); 3907 else if (ifmgd->nullfunc_failed) { 3908 if (ifmgd->probe_send_count < max_tries) { 3909 mlme_dbg(sdata, 3910 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3911 bssid, ifmgd->probe_send_count, 3912 max_tries); 3913 ieee80211_mgd_probe_ap_send(sdata); 3914 } else { 3915 mlme_dbg(sdata, 3916 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3917 bssid); 3918 ieee80211_sta_connection_lost(sdata, bssid, 3919 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3920 false); 3921 } 3922 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3923 run_again(sdata, ifmgd->probe_timeout); 3924 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3925 mlme_dbg(sdata, 3926 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3927 bssid, probe_wait_ms); 3928 ieee80211_sta_connection_lost(sdata, bssid, 3929 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3930 } else if (ifmgd->probe_send_count < max_tries) { 3931 mlme_dbg(sdata, 3932 "No probe response from AP %pM after %dms, try %d/%i\n", 3933 bssid, probe_wait_ms, 3934 ifmgd->probe_send_count, max_tries); 3935 ieee80211_mgd_probe_ap_send(sdata); 3936 } else { 3937 /* 3938 * We actually lost the connection ... or did we? 3939 * Let's make sure! 3940 */ 3941 mlme_dbg(sdata, 3942 "No probe response from AP %pM after %dms, disconnecting.\n", 3943 bssid, probe_wait_ms); 3944 3945 ieee80211_sta_connection_lost(sdata, bssid, 3946 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3947 } 3948 } 3949 3950 sdata_unlock(sdata); 3951 } 3952 3953 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3954 { 3955 struct ieee80211_sub_if_data *sdata = 3956 (struct ieee80211_sub_if_data *) data; 3957 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3958 3959 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3960 return; 3961 3962 sdata->u.mgd.connection_loss = false; 3963 ieee80211_queue_work(&sdata->local->hw, 3964 &sdata->u.mgd.beacon_connection_loss_work); 3965 } 3966 3967 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3968 { 3969 struct ieee80211_sub_if_data *sdata = 3970 (struct ieee80211_sub_if_data *) data; 3971 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3972 struct ieee80211_local *local = sdata->local; 3973 3974 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3975 return; 3976 3977 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3978 } 3979 3980 static void ieee80211_sta_monitor_work(struct work_struct *work) 3981 { 3982 struct ieee80211_sub_if_data *sdata = 3983 container_of(work, struct ieee80211_sub_if_data, 3984 u.mgd.monitor_work); 3985 3986 ieee80211_mgd_probe_ap(sdata, false); 3987 } 3988 3989 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3990 { 3991 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3992 __ieee80211_stop_poll(sdata); 3993 3994 /* let's probe the connection once */ 3995 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 3996 ieee80211_queue_work(&sdata->local->hw, 3997 &sdata->u.mgd.monitor_work); 3998 } 3999 } 4000 4001 #ifdef CONFIG_PM 4002 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4003 { 4004 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4005 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4006 4007 sdata_lock(sdata); 4008 4009 if (ifmgd->auth_data || ifmgd->assoc_data) { 4010 const u8 *bssid = ifmgd->auth_data ? 4011 ifmgd->auth_data->bss->bssid : 4012 ifmgd->assoc_data->bss->bssid; 4013 4014 /* 4015 * If we are trying to authenticate / associate while suspending, 4016 * cfg80211 won't know and won't actually abort those attempts, 4017 * thus we need to do that ourselves. 4018 */ 4019 ieee80211_send_deauth_disassoc(sdata, bssid, 4020 IEEE80211_STYPE_DEAUTH, 4021 WLAN_REASON_DEAUTH_LEAVING, 4022 false, frame_buf); 4023 if (ifmgd->assoc_data) 4024 ieee80211_destroy_assoc_data(sdata, false); 4025 if (ifmgd->auth_data) 4026 ieee80211_destroy_auth_data(sdata, false); 4027 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4028 IEEE80211_DEAUTH_FRAME_LEN); 4029 } 4030 4031 /* This is a bit of a hack - we should find a better and more generic 4032 * solution to this. Normally when suspending, cfg80211 will in fact 4033 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4034 * auth (not so important) or assoc (this is the problem) process. 4035 * 4036 * As a consequence, it can happen that we are in the process of both 4037 * associating and suspending, and receive an association response 4038 * after cfg80211 has checked if it needs to disconnect, but before 4039 * we actually set the flag to drop incoming frames. This will then 4040 * cause the workqueue flush to process the association response in 4041 * the suspend, resulting in a successful association just before it 4042 * tries to remove the interface from the driver, which now though 4043 * has a channel context assigned ... this results in issues. 4044 * 4045 * To work around this (for now) simply deauth here again if we're 4046 * now connected. 4047 */ 4048 if (ifmgd->associated && !sdata->local->wowlan) { 4049 u8 bssid[ETH_ALEN]; 4050 struct cfg80211_deauth_request req = { 4051 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4052 .bssid = bssid, 4053 }; 4054 4055 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4056 ieee80211_mgd_deauth(sdata, &req); 4057 } 4058 4059 sdata_unlock(sdata); 4060 } 4061 4062 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4063 { 4064 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4065 4066 sdata_lock(sdata); 4067 if (!ifmgd->associated) { 4068 sdata_unlock(sdata); 4069 return; 4070 } 4071 4072 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4073 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4074 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4075 ieee80211_sta_connection_lost(sdata, 4076 ifmgd->associated->bssid, 4077 WLAN_REASON_UNSPECIFIED, 4078 true); 4079 sdata_unlock(sdata); 4080 return; 4081 } 4082 sdata_unlock(sdata); 4083 } 4084 #endif 4085 4086 /* interface setup */ 4087 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4088 { 4089 struct ieee80211_if_managed *ifmgd; 4090 4091 ifmgd = &sdata->u.mgd; 4092 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4093 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4094 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4095 ieee80211_beacon_connection_loss_work); 4096 INIT_WORK(&ifmgd->csa_connection_drop_work, 4097 ieee80211_csa_connection_drop_work); 4098 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4099 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4100 ieee80211_tdls_peer_del_work); 4101 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4102 (unsigned long) sdata); 4103 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4104 (unsigned long) sdata); 4105 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4106 (unsigned long) sdata); 4107 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4108 (unsigned long) sdata); 4109 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4110 ieee80211_sta_handle_tspec_ac_params_wk); 4111 4112 ifmgd->flags = 0; 4113 ifmgd->powersave = sdata->wdev.ps; 4114 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4115 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4116 ifmgd->p2p_noa_index = -1; 4117 4118 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4119 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4120 else 4121 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4122 4123 /* Setup TDLS data */ 4124 spin_lock_init(&ifmgd->teardown_lock); 4125 ifmgd->teardown_skb = NULL; 4126 ifmgd->orig_teardown_skb = NULL; 4127 } 4128 4129 /* scan finished notification */ 4130 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4131 { 4132 struct ieee80211_sub_if_data *sdata; 4133 4134 /* Restart STA timers */ 4135 rcu_read_lock(); 4136 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4137 if (ieee80211_sdata_running(sdata)) 4138 ieee80211_restart_sta_timer(sdata); 4139 } 4140 rcu_read_unlock(); 4141 } 4142 4143 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4144 struct cfg80211_bss *cbss) 4145 { 4146 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4147 const u8 *ht_cap_ie, *vht_cap_ie; 4148 const struct ieee80211_ht_cap *ht_cap; 4149 const struct ieee80211_vht_cap *vht_cap; 4150 u8 chains = 1; 4151 4152 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4153 return chains; 4154 4155 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4156 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4157 ht_cap = (void *)(ht_cap_ie + 2); 4158 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4159 /* 4160 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4161 * "Tx Unequal Modulation Supported" fields. 4162 */ 4163 } 4164 4165 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4166 return chains; 4167 4168 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4169 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4170 u8 nss; 4171 u16 tx_mcs_map; 4172 4173 vht_cap = (void *)(vht_cap_ie + 2); 4174 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4175 for (nss = 8; nss > 0; nss--) { 4176 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4177 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4178 break; 4179 } 4180 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4181 chains = max(chains, nss); 4182 } 4183 4184 return chains; 4185 } 4186 4187 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4188 struct cfg80211_bss *cbss) 4189 { 4190 struct ieee80211_local *local = sdata->local; 4191 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4192 const struct ieee80211_ht_cap *ht_cap = NULL; 4193 const struct ieee80211_ht_operation *ht_oper = NULL; 4194 const struct ieee80211_vht_operation *vht_oper = NULL; 4195 struct ieee80211_supported_band *sband; 4196 struct cfg80211_chan_def chandef; 4197 int ret; 4198 u32 i; 4199 bool have_80mhz; 4200 4201 sband = local->hw.wiphy->bands[cbss->channel->band]; 4202 4203 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4204 IEEE80211_STA_DISABLE_80P80MHZ | 4205 IEEE80211_STA_DISABLE_160MHZ); 4206 4207 rcu_read_lock(); 4208 4209 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4210 sband->ht_cap.ht_supported) { 4211 const u8 *ht_oper_ie, *ht_cap_ie; 4212 4213 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4214 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4215 ht_oper = (void *)(ht_oper_ie + 2); 4216 4217 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4218 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4219 ht_cap = (void *)(ht_cap_ie + 2); 4220 4221 if (!ht_cap) { 4222 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4223 ht_oper = NULL; 4224 } 4225 } 4226 4227 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4228 sband->vht_cap.vht_supported) { 4229 const u8 *vht_oper_ie, *vht_cap; 4230 4231 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4232 WLAN_EID_VHT_OPERATION); 4233 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4234 vht_oper = (void *)(vht_oper_ie + 2); 4235 if (vht_oper && !ht_oper) { 4236 vht_oper = NULL; 4237 sdata_info(sdata, 4238 "AP advertised VHT without HT, disabling both\n"); 4239 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4240 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4241 } 4242 4243 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4244 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4245 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4246 vht_oper = NULL; 4247 } 4248 } 4249 4250 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4251 have_80mhz = false; 4252 for (i = 0; i < sband->n_channels; i++) { 4253 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4254 IEEE80211_CHAN_NO_80MHZ)) 4255 continue; 4256 4257 have_80mhz = true; 4258 break; 4259 } 4260 4261 if (!have_80mhz) 4262 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4263 4264 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4265 cbss->channel, 4266 ht_cap, ht_oper, vht_oper, 4267 &chandef, false); 4268 4269 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4270 local->rx_chains); 4271 4272 rcu_read_unlock(); 4273 4274 /* will change later if needed */ 4275 sdata->smps_mode = IEEE80211_SMPS_OFF; 4276 4277 mutex_lock(&local->mtx); 4278 /* 4279 * If this fails (possibly due to channel context sharing 4280 * on incompatible channels, e.g. 80+80 and 160 sharing the 4281 * same control channel) try to use a smaller bandwidth. 4282 */ 4283 ret = ieee80211_vif_use_channel(sdata, &chandef, 4284 IEEE80211_CHANCTX_SHARED); 4285 4286 /* don't downgrade for 5 and 10 MHz channels, though. */ 4287 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4288 chandef.width == NL80211_CHAN_WIDTH_10) 4289 goto out; 4290 4291 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4292 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4293 ret = ieee80211_vif_use_channel(sdata, &chandef, 4294 IEEE80211_CHANCTX_SHARED); 4295 } 4296 out: 4297 mutex_unlock(&local->mtx); 4298 return ret; 4299 } 4300 4301 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4302 struct cfg80211_bss *cbss, bool assoc, 4303 bool override) 4304 { 4305 struct ieee80211_local *local = sdata->local; 4306 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4307 struct ieee80211_bss *bss = (void *)cbss->priv; 4308 struct sta_info *new_sta = NULL; 4309 struct ieee80211_supported_band *sband; 4310 bool have_sta = false; 4311 int err; 4312 4313 sband = local->hw.wiphy->bands[cbss->channel->band]; 4314 4315 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4316 return -EINVAL; 4317 4318 if (assoc) { 4319 rcu_read_lock(); 4320 have_sta = sta_info_get(sdata, cbss->bssid); 4321 rcu_read_unlock(); 4322 } 4323 4324 if (!have_sta) { 4325 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4326 if (!new_sta) 4327 return -ENOMEM; 4328 } 4329 4330 if (new_sta || override) { 4331 err = ieee80211_prep_channel(sdata, cbss); 4332 if (err) { 4333 if (new_sta) 4334 sta_info_free(local, new_sta); 4335 return -EINVAL; 4336 } 4337 } 4338 4339 if (new_sta) { 4340 u32 rates = 0, basic_rates = 0; 4341 bool have_higher_than_11mbit; 4342 int min_rate = INT_MAX, min_rate_index = -1; 4343 struct ieee80211_chanctx_conf *chanctx_conf; 4344 const struct cfg80211_bss_ies *ies; 4345 int shift = ieee80211_vif_get_shift(&sdata->vif); 4346 u32 rate_flags; 4347 4348 rcu_read_lock(); 4349 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4350 if (WARN_ON(!chanctx_conf)) { 4351 rcu_read_unlock(); 4352 sta_info_free(local, new_sta); 4353 return -EINVAL; 4354 } 4355 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4356 rcu_read_unlock(); 4357 4358 ieee80211_get_rates(sband, bss->supp_rates, 4359 bss->supp_rates_len, 4360 &rates, &basic_rates, 4361 &have_higher_than_11mbit, 4362 &min_rate, &min_rate_index, 4363 shift, rate_flags); 4364 4365 /* 4366 * This used to be a workaround for basic rates missing 4367 * in the association response frame. Now that we no 4368 * longer use the basic rates from there, it probably 4369 * doesn't happen any more, but keep the workaround so 4370 * in case some *other* APs are buggy in different ways 4371 * we can connect -- with a warning. 4372 */ 4373 if (!basic_rates && min_rate_index >= 0) { 4374 sdata_info(sdata, 4375 "No basic rates, using min rate instead\n"); 4376 basic_rates = BIT(min_rate_index); 4377 } 4378 4379 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4380 sdata->vif.bss_conf.basic_rates = basic_rates; 4381 4382 /* cf. IEEE 802.11 9.2.12 */ 4383 if (cbss->channel->band == NL80211_BAND_2GHZ && 4384 have_higher_than_11mbit) 4385 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4386 else 4387 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4388 4389 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4390 4391 /* set timing information */ 4392 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4393 rcu_read_lock(); 4394 ies = rcu_dereference(cbss->beacon_ies); 4395 if (ies) { 4396 const u8 *tim_ie; 4397 4398 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4399 sdata->vif.bss_conf.sync_device_ts = 4400 bss->device_ts_beacon; 4401 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4402 ies->data, ies->len); 4403 if (tim_ie && tim_ie[1] >= 2) 4404 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4405 else 4406 sdata->vif.bss_conf.sync_dtim_count = 0; 4407 } else if (!ieee80211_hw_check(&sdata->local->hw, 4408 TIMING_BEACON_ONLY)) { 4409 ies = rcu_dereference(cbss->proberesp_ies); 4410 /* must be non-NULL since beacon IEs were NULL */ 4411 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4412 sdata->vif.bss_conf.sync_device_ts = 4413 bss->device_ts_presp; 4414 sdata->vif.bss_conf.sync_dtim_count = 0; 4415 } else { 4416 sdata->vif.bss_conf.sync_tsf = 0; 4417 sdata->vif.bss_conf.sync_device_ts = 0; 4418 sdata->vif.bss_conf.sync_dtim_count = 0; 4419 } 4420 rcu_read_unlock(); 4421 4422 /* tell driver about BSSID, basic rates and timing */ 4423 ieee80211_bss_info_change_notify(sdata, 4424 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4425 BSS_CHANGED_BEACON_INT); 4426 4427 if (assoc) 4428 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4429 4430 err = sta_info_insert(new_sta); 4431 new_sta = NULL; 4432 if (err) { 4433 sdata_info(sdata, 4434 "failed to insert STA entry for the AP (error %d)\n", 4435 err); 4436 return err; 4437 } 4438 } else 4439 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4440 4441 /* Cancel scan to ensure that nothing interferes with connection */ 4442 if (local->scanning) 4443 ieee80211_scan_cancel(local); 4444 4445 return 0; 4446 } 4447 4448 /* config hooks */ 4449 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4450 struct cfg80211_auth_request *req) 4451 { 4452 struct ieee80211_local *local = sdata->local; 4453 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4454 struct ieee80211_mgd_auth_data *auth_data; 4455 u16 auth_alg; 4456 int err; 4457 4458 /* prepare auth data structure */ 4459 4460 switch (req->auth_type) { 4461 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4462 auth_alg = WLAN_AUTH_OPEN; 4463 break; 4464 case NL80211_AUTHTYPE_SHARED_KEY: 4465 if (IS_ERR(local->wep_tx_tfm)) 4466 return -EOPNOTSUPP; 4467 auth_alg = WLAN_AUTH_SHARED_KEY; 4468 break; 4469 case NL80211_AUTHTYPE_FT: 4470 auth_alg = WLAN_AUTH_FT; 4471 break; 4472 case NL80211_AUTHTYPE_NETWORK_EAP: 4473 auth_alg = WLAN_AUTH_LEAP; 4474 break; 4475 case NL80211_AUTHTYPE_SAE: 4476 auth_alg = WLAN_AUTH_SAE; 4477 break; 4478 default: 4479 return -EOPNOTSUPP; 4480 } 4481 4482 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4483 req->ie_len, GFP_KERNEL); 4484 if (!auth_data) 4485 return -ENOMEM; 4486 4487 auth_data->bss = req->bss; 4488 4489 if (req->sae_data_len >= 4) { 4490 __le16 *pos = (__le16 *) req->sae_data; 4491 auth_data->sae_trans = le16_to_cpu(pos[0]); 4492 auth_data->sae_status = le16_to_cpu(pos[1]); 4493 memcpy(auth_data->data, req->sae_data + 4, 4494 req->sae_data_len - 4); 4495 auth_data->data_len += req->sae_data_len - 4; 4496 } 4497 4498 if (req->ie && req->ie_len) { 4499 memcpy(&auth_data->data[auth_data->data_len], 4500 req->ie, req->ie_len); 4501 auth_data->data_len += req->ie_len; 4502 } 4503 4504 if (req->key && req->key_len) { 4505 auth_data->key_len = req->key_len; 4506 auth_data->key_idx = req->key_idx; 4507 memcpy(auth_data->key, req->key, req->key_len); 4508 } 4509 4510 auth_data->algorithm = auth_alg; 4511 4512 /* try to authenticate/probe */ 4513 4514 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4515 ifmgd->assoc_data) { 4516 err = -EBUSY; 4517 goto err_free; 4518 } 4519 4520 if (ifmgd->auth_data) 4521 ieee80211_destroy_auth_data(sdata, false); 4522 4523 /* prep auth_data so we don't go into idle on disassoc */ 4524 ifmgd->auth_data = auth_data; 4525 4526 if (ifmgd->associated) { 4527 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4528 4529 sdata_info(sdata, 4530 "disconnect from AP %pM for new auth to %pM\n", 4531 ifmgd->associated->bssid, req->bss->bssid); 4532 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4533 WLAN_REASON_UNSPECIFIED, 4534 false, frame_buf); 4535 4536 ieee80211_report_disconnect(sdata, frame_buf, 4537 sizeof(frame_buf), true, 4538 WLAN_REASON_UNSPECIFIED); 4539 } 4540 4541 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4542 4543 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4544 if (err) 4545 goto err_clear; 4546 4547 err = ieee80211_auth(sdata); 4548 if (err) { 4549 sta_info_destroy_addr(sdata, req->bss->bssid); 4550 goto err_clear; 4551 } 4552 4553 /* hold our own reference */ 4554 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4555 return 0; 4556 4557 err_clear: 4558 eth_zero_addr(ifmgd->bssid); 4559 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4560 ifmgd->auth_data = NULL; 4561 mutex_lock(&sdata->local->mtx); 4562 ieee80211_vif_release_channel(sdata); 4563 mutex_unlock(&sdata->local->mtx); 4564 err_free: 4565 kfree(auth_data); 4566 return err; 4567 } 4568 4569 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4570 struct cfg80211_assoc_request *req) 4571 { 4572 struct ieee80211_local *local = sdata->local; 4573 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4574 struct ieee80211_bss *bss = (void *)req->bss->priv; 4575 struct ieee80211_mgd_assoc_data *assoc_data; 4576 const struct cfg80211_bss_ies *beacon_ies; 4577 struct ieee80211_supported_band *sband; 4578 const u8 *ssidie, *ht_ie, *vht_ie; 4579 int i, err; 4580 bool override = false; 4581 4582 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4583 if (!assoc_data) 4584 return -ENOMEM; 4585 4586 rcu_read_lock(); 4587 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4588 if (!ssidie) { 4589 rcu_read_unlock(); 4590 kfree(assoc_data); 4591 return -EINVAL; 4592 } 4593 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4594 assoc_data->ssid_len = ssidie[1]; 4595 rcu_read_unlock(); 4596 4597 if (ifmgd->associated) { 4598 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4599 4600 sdata_info(sdata, 4601 "disconnect from AP %pM for new assoc to %pM\n", 4602 ifmgd->associated->bssid, req->bss->bssid); 4603 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4604 WLAN_REASON_UNSPECIFIED, 4605 false, frame_buf); 4606 4607 ieee80211_report_disconnect(sdata, frame_buf, 4608 sizeof(frame_buf), true, 4609 WLAN_REASON_UNSPECIFIED); 4610 } 4611 4612 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4613 err = -EBUSY; 4614 goto err_free; 4615 } 4616 4617 if (ifmgd->assoc_data) { 4618 err = -EBUSY; 4619 goto err_free; 4620 } 4621 4622 if (ifmgd->auth_data) { 4623 bool match; 4624 4625 /* keep sta info, bssid if matching */ 4626 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4627 ieee80211_destroy_auth_data(sdata, match); 4628 } 4629 4630 /* prepare assoc data */ 4631 4632 ifmgd->beacon_crc_valid = false; 4633 4634 assoc_data->wmm = bss->wmm_used && 4635 (local->hw.queues >= IEEE80211_NUM_ACS); 4636 4637 /* 4638 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4639 * We still associate in non-HT mode (11a/b/g) if any one of these 4640 * ciphers is configured as pairwise. 4641 * We can set this to true for non-11n hardware, that'll be checked 4642 * separately along with the peer capabilities. 4643 */ 4644 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4645 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4646 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4647 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4648 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4649 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4650 netdev_info(sdata->dev, 4651 "disabling HT/VHT due to WEP/TKIP use\n"); 4652 } 4653 } 4654 4655 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4656 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4657 if (!sband->ht_cap.ht_supported || 4658 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4659 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4660 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4661 if (!bss->wmm_used && 4662 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4663 netdev_info(sdata->dev, 4664 "disabling HT as WMM/QoS is not supported by the AP\n"); 4665 } 4666 4667 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4668 if (!sband->vht_cap.vht_supported || 4669 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4670 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4671 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4672 if (!bss->wmm_used && 4673 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4674 netdev_info(sdata->dev, 4675 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4676 } 4677 4678 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4679 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4680 sizeof(ifmgd->ht_capa_mask)); 4681 4682 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4683 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4684 sizeof(ifmgd->vht_capa_mask)); 4685 4686 if (req->ie && req->ie_len) { 4687 memcpy(assoc_data->ie, req->ie, req->ie_len); 4688 assoc_data->ie_len = req->ie_len; 4689 } 4690 4691 assoc_data->bss = req->bss; 4692 4693 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4694 if (ifmgd->powersave) 4695 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4696 else 4697 sdata->smps_mode = IEEE80211_SMPS_OFF; 4698 } else 4699 sdata->smps_mode = ifmgd->req_smps; 4700 4701 assoc_data->capability = req->bss->capability; 4702 assoc_data->supp_rates = bss->supp_rates; 4703 assoc_data->supp_rates_len = bss->supp_rates_len; 4704 4705 rcu_read_lock(); 4706 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4707 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4708 assoc_data->ap_ht_param = 4709 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4710 else 4711 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4712 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4713 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4714 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4715 sizeof(struct ieee80211_vht_cap)); 4716 else 4717 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4718 rcu_read_unlock(); 4719 4720 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4721 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4722 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4723 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4724 4725 if (bss->wmm_used && bss->uapsd_supported && 4726 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4727 assoc_data->uapsd = true; 4728 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4729 } else { 4730 assoc_data->uapsd = false; 4731 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4732 } 4733 4734 if (req->prev_bssid) 4735 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4736 4737 if (req->use_mfp) { 4738 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4739 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4740 } else { 4741 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4742 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4743 } 4744 4745 if (req->flags & ASSOC_REQ_USE_RRM) 4746 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4747 else 4748 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4749 4750 if (req->crypto.control_port) 4751 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4752 else 4753 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4754 4755 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4756 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4757 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4758 sdata->vif.type); 4759 4760 /* kick off associate process */ 4761 4762 ifmgd->assoc_data = assoc_data; 4763 ifmgd->dtim_period = 0; 4764 ifmgd->have_beacon = false; 4765 4766 /* override HT/VHT configuration only if the AP and we support it */ 4767 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4768 struct ieee80211_sta_ht_cap sta_ht_cap; 4769 4770 if (req->flags & ASSOC_REQ_DISABLE_HT) 4771 override = true; 4772 4773 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4774 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4775 4776 /* check for 40 MHz disable override */ 4777 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4778 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4779 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4780 override = true; 4781 4782 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4783 req->flags & ASSOC_REQ_DISABLE_VHT) 4784 override = true; 4785 } 4786 4787 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4788 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4789 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4790 } 4791 4792 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4793 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4794 4795 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4796 if (err) 4797 goto err_clear; 4798 4799 rcu_read_lock(); 4800 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4801 4802 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4803 !beacon_ies) { 4804 /* 4805 * Wait up to one beacon interval ... 4806 * should this be more if we miss one? 4807 */ 4808 sdata_info(sdata, "waiting for beacon from %pM\n", 4809 ifmgd->bssid); 4810 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4811 assoc_data->timeout_started = true; 4812 assoc_data->need_beacon = true; 4813 } else if (beacon_ies) { 4814 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4815 beacon_ies->data, 4816 beacon_ies->len); 4817 u8 dtim_count = 0; 4818 4819 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4820 const struct ieee80211_tim_ie *tim; 4821 tim = (void *)(tim_ie + 2); 4822 ifmgd->dtim_period = tim->dtim_period; 4823 dtim_count = tim->dtim_count; 4824 } 4825 ifmgd->have_beacon = true; 4826 assoc_data->timeout = jiffies; 4827 assoc_data->timeout_started = true; 4828 4829 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4830 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4831 sdata->vif.bss_conf.sync_device_ts = 4832 bss->device_ts_beacon; 4833 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4834 } 4835 } else { 4836 assoc_data->timeout = jiffies; 4837 assoc_data->timeout_started = true; 4838 } 4839 rcu_read_unlock(); 4840 4841 run_again(sdata, assoc_data->timeout); 4842 4843 if (bss->corrupt_data) { 4844 char *corrupt_type = "data"; 4845 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4846 if (bss->corrupt_data & 4847 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4848 corrupt_type = "beacon and probe response"; 4849 else 4850 corrupt_type = "beacon"; 4851 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4852 corrupt_type = "probe response"; 4853 sdata_info(sdata, "associating with AP with corrupt %s\n", 4854 corrupt_type); 4855 } 4856 4857 return 0; 4858 err_clear: 4859 eth_zero_addr(ifmgd->bssid); 4860 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4861 ifmgd->assoc_data = NULL; 4862 err_free: 4863 kfree(assoc_data); 4864 return err; 4865 } 4866 4867 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4868 struct cfg80211_deauth_request *req) 4869 { 4870 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4871 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4872 bool tx = !req->local_state_change; 4873 4874 if (ifmgd->auth_data && 4875 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4876 sdata_info(sdata, 4877 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4878 req->bssid, req->reason_code, 4879 ieee80211_get_reason_code_string(req->reason_code)); 4880 4881 drv_mgd_prepare_tx(sdata->local, sdata); 4882 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4883 IEEE80211_STYPE_DEAUTH, 4884 req->reason_code, tx, 4885 frame_buf); 4886 ieee80211_destroy_auth_data(sdata, false); 4887 ieee80211_report_disconnect(sdata, frame_buf, 4888 sizeof(frame_buf), true, 4889 req->reason_code); 4890 4891 return 0; 4892 } 4893 4894 if (ifmgd->assoc_data && 4895 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4896 sdata_info(sdata, 4897 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4898 req->bssid, req->reason_code, 4899 ieee80211_get_reason_code_string(req->reason_code)); 4900 4901 drv_mgd_prepare_tx(sdata->local, sdata); 4902 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4903 IEEE80211_STYPE_DEAUTH, 4904 req->reason_code, tx, 4905 frame_buf); 4906 ieee80211_destroy_assoc_data(sdata, false); 4907 ieee80211_report_disconnect(sdata, frame_buf, 4908 sizeof(frame_buf), true, 4909 req->reason_code); 4910 return 0; 4911 } 4912 4913 if (ifmgd->associated && 4914 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4915 sdata_info(sdata, 4916 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4917 req->bssid, req->reason_code, 4918 ieee80211_get_reason_code_string(req->reason_code)); 4919 4920 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4921 req->reason_code, tx, frame_buf); 4922 ieee80211_report_disconnect(sdata, frame_buf, 4923 sizeof(frame_buf), true, 4924 req->reason_code); 4925 return 0; 4926 } 4927 4928 return -ENOTCONN; 4929 } 4930 4931 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4932 struct cfg80211_disassoc_request *req) 4933 { 4934 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4935 u8 bssid[ETH_ALEN]; 4936 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4937 4938 /* 4939 * cfg80211 should catch this ... but it's racy since 4940 * we can receive a disassoc frame, process it, hand it 4941 * to cfg80211 while that's in a locked section already 4942 * trying to tell us that the user wants to disconnect. 4943 */ 4944 if (ifmgd->associated != req->bss) 4945 return -ENOLINK; 4946 4947 sdata_info(sdata, 4948 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4949 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4950 4951 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4952 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4953 req->reason_code, !req->local_state_change, 4954 frame_buf); 4955 4956 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 4957 req->reason_code); 4958 4959 return 0; 4960 } 4961 4962 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4963 { 4964 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4965 4966 /* 4967 * Make sure some work items will not run after this, 4968 * they will not do anything but might not have been 4969 * cancelled when disconnecting. 4970 */ 4971 cancel_work_sync(&ifmgd->monitor_work); 4972 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4973 cancel_work_sync(&ifmgd->request_smps_work); 4974 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4975 cancel_work_sync(&ifmgd->chswitch_work); 4976 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4977 4978 sdata_lock(sdata); 4979 if (ifmgd->assoc_data) { 4980 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4981 ieee80211_destroy_assoc_data(sdata, false); 4982 cfg80211_assoc_timeout(sdata->dev, bss); 4983 } 4984 if (ifmgd->auth_data) 4985 ieee80211_destroy_auth_data(sdata, false); 4986 spin_lock_bh(&ifmgd->teardown_lock); 4987 if (ifmgd->teardown_skb) { 4988 kfree_skb(ifmgd->teardown_skb); 4989 ifmgd->teardown_skb = NULL; 4990 ifmgd->orig_teardown_skb = NULL; 4991 } 4992 spin_unlock_bh(&ifmgd->teardown_lock); 4993 del_timer_sync(&ifmgd->timer); 4994 sdata_unlock(sdata); 4995 } 4996 4997 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4998 enum nl80211_cqm_rssi_threshold_event rssi_event, 4999 gfp_t gfp) 5000 { 5001 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5002 5003 trace_api_cqm_rssi_notify(sdata, rssi_event); 5004 5005 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 5006 } 5007 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5008 5009 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5010 { 5011 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5012 5013 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5014 5015 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5016 } 5017 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5018