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 Intel Deutschland GmbH 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <linux/delay.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/moduleparam.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/crc32.h> 24 #include <linux/slab.h> 25 #include <linux/export.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "rate.h" 32 #include "led.h" 33 34 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 35 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2) 36 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10) 37 #define IEEE80211_AUTH_MAX_TRIES 3 38 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 40 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2) 41 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 42 #define IEEE80211_ASSOC_MAX_TRIES 3 43 44 static int max_nullfunc_tries = 2; 45 module_param(max_nullfunc_tries, int, 0644); 46 MODULE_PARM_DESC(max_nullfunc_tries, 47 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 48 49 static int max_probe_tries = 5; 50 module_param(max_probe_tries, int, 0644); 51 MODULE_PARM_DESC(max_probe_tries, 52 "Maximum probe tries before disconnecting (reason 4)."); 53 54 /* 55 * Beacon loss timeout is calculated as N frames times the 56 * advertised beacon interval. This may need to be somewhat 57 * higher than what hardware might detect to account for 58 * delays in the host processing frames. But since we also 59 * probe on beacon miss before declaring the connection lost 60 * default to what we want. 61 */ 62 static int beacon_loss_count = 7; 63 module_param(beacon_loss_count, int, 0644); 64 MODULE_PARM_DESC(beacon_loss_count, 65 "Number of beacon intervals before we decide beacon was lost."); 66 67 /* 68 * Time the connection can be idle before we probe 69 * it to see if we can still talk to the AP. 70 */ 71 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 72 /* 73 * Time we wait for a probe response after sending 74 * a probe request because of beacon loss or for 75 * checking the connection still works. 76 */ 77 static int probe_wait_ms = 500; 78 module_param(probe_wait_ms, int, 0644); 79 MODULE_PARM_DESC(probe_wait_ms, 80 "Maximum time(ms) to wait for probe response" 81 " before disconnecting (reason 4)."); 82 83 /* 84 * How many Beacon frames need to have been used in average signal strength 85 * before starting to indicate signal change events. 86 */ 87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 88 89 /* 90 * We can have multiple work items (and connection probing) 91 * scheduling this timer, but we need to take care to only 92 * reschedule it when it should fire _earlier_ than it was 93 * asked for before, or if it's not pending right now. This 94 * function ensures that. Note that it then is required to 95 * run this function for all timeouts after the first one 96 * has happened -- the work that runs from this timer will 97 * do that. 98 */ 99 static void run_again(struct ieee80211_sub_if_data *sdata, 100 unsigned long timeout) 101 { 102 sdata_assert_lock(sdata); 103 104 if (!timer_pending(&sdata->u.mgd.timer) || 105 time_before(timeout, sdata->u.mgd.timer.expires)) 106 mod_timer(&sdata->u.mgd.timer, timeout); 107 } 108 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 110 { 111 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 112 return; 113 114 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 115 return; 116 117 mod_timer(&sdata->u.mgd.bcn_mon_timer, 118 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 119 } 120 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 122 { 123 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 124 125 if (unlikely(!sdata->u.mgd.associated)) 126 return; 127 128 ifmgd->probe_send_count = 0; 129 130 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 131 return; 132 133 mod_timer(&sdata->u.mgd.conn_mon_timer, 134 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 135 } 136 137 static int ecw2cw(int ecw) 138 { 139 return (1 << ecw) - 1; 140 } 141 142 static u32 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 144 struct ieee80211_supported_band *sband, 145 struct ieee80211_channel *channel, 146 const struct ieee80211_ht_cap *ht_cap, 147 const struct ieee80211_ht_operation *ht_oper, 148 const struct ieee80211_vht_operation *vht_oper, 149 struct cfg80211_chan_def *chandef, bool tracking) 150 { 151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 152 struct cfg80211_chan_def vht_chandef; 153 struct ieee80211_sta_ht_cap sta_ht_cap; 154 u32 ht_cfreq, ret; 155 156 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 157 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 158 159 chandef->chan = channel; 160 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 161 chandef->center_freq1 = channel->center_freq; 162 chandef->center_freq2 = 0; 163 164 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) { 165 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 166 goto out; 167 } 168 169 chandef->width = NL80211_CHAN_WIDTH_20; 170 171 if (!(ht_cap->cap_info & 172 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) { 173 ret = IEEE80211_STA_DISABLE_40MHZ; 174 vht_chandef = *chandef; 175 goto out; 176 } 177 178 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 179 channel->band); 180 /* check that channel matches the right operating channel */ 181 if (!tracking && channel->center_freq != ht_cfreq) { 182 /* 183 * It's possible that some APs are confused here; 184 * Netgear WNDR3700 sometimes reports 4 higher than 185 * the actual channel in association responses, but 186 * since we look at probe response/beacon data here 187 * it should be OK. 188 */ 189 sdata_info(sdata, 190 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 191 channel->center_freq, ht_cfreq, 192 ht_oper->primary_chan, channel->band); 193 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 194 goto out; 195 } 196 197 /* check 40 MHz support, if we have it */ 198 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 199 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 200 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 201 chandef->width = NL80211_CHAN_WIDTH_40; 202 chandef->center_freq1 += 10; 203 break; 204 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 205 chandef->width = NL80211_CHAN_WIDTH_40; 206 chandef->center_freq1 -= 10; 207 break; 208 } 209 } else { 210 /* 40 MHz (and 80 MHz) must be supported for VHT */ 211 ret = IEEE80211_STA_DISABLE_VHT; 212 /* also mark 40 MHz disabled */ 213 ret |= IEEE80211_STA_DISABLE_40MHZ; 214 goto out; 215 } 216 217 if (!vht_oper || !sband->vht_cap.vht_supported) { 218 ret = IEEE80211_STA_DISABLE_VHT; 219 goto out; 220 } 221 222 vht_chandef.chan = channel; 223 vht_chandef.center_freq1 = 224 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx, 225 channel->band); 226 vht_chandef.center_freq2 = 0; 227 228 switch (vht_oper->chan_width) { 229 case IEEE80211_VHT_CHANWIDTH_USE_HT: 230 vht_chandef.width = chandef->width; 231 vht_chandef.center_freq1 = chandef->center_freq1; 232 break; 233 case IEEE80211_VHT_CHANWIDTH_80MHZ: 234 vht_chandef.width = NL80211_CHAN_WIDTH_80; 235 break; 236 case IEEE80211_VHT_CHANWIDTH_160MHZ: 237 vht_chandef.width = NL80211_CHAN_WIDTH_160; 238 break; 239 case IEEE80211_VHT_CHANWIDTH_80P80MHZ: 240 vht_chandef.width = NL80211_CHAN_WIDTH_80P80; 241 vht_chandef.center_freq2 = 242 ieee80211_channel_to_frequency( 243 vht_oper->center_freq_seg2_idx, 244 channel->band); 245 break; 246 default: 247 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 248 sdata_info(sdata, 249 "AP VHT operation IE has invalid channel width (%d), disable VHT\n", 250 vht_oper->chan_width); 251 ret = IEEE80211_STA_DISABLE_VHT; 252 goto out; 253 } 254 255 if (!cfg80211_chandef_valid(&vht_chandef)) { 256 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 257 sdata_info(sdata, 258 "AP VHT information is invalid, disable VHT\n"); 259 ret = IEEE80211_STA_DISABLE_VHT; 260 goto out; 261 } 262 263 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 264 ret = 0; 265 goto out; 266 } 267 268 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 269 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 270 sdata_info(sdata, 271 "AP VHT information doesn't match HT, disable VHT\n"); 272 ret = IEEE80211_STA_DISABLE_VHT; 273 goto out; 274 } 275 276 *chandef = vht_chandef; 277 278 ret = 0; 279 280 out: 281 /* 282 * When tracking the current AP, don't do any further checks if the 283 * new chandef is identical to the one we're currently using for the 284 * connection. This keeps us from playing ping-pong with regulatory, 285 * without it the following can happen (for example): 286 * - connect to an AP with 80 MHz, world regdom allows 80 MHz 287 * - AP advertises regdom US 288 * - CRDA loads regdom US with 80 MHz prohibited (old database) 289 * - the code below detects an unsupported channel, downgrades, and 290 * we disconnect from the AP in the caller 291 * - disconnect causes CRDA to reload world regdomain and the game 292 * starts anew. 293 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) 294 * 295 * It seems possible that there are still scenarios with CSA or real 296 * bandwidth changes where a this could happen, but those cases are 297 * less common and wouldn't completely prevent using the AP. 298 */ 299 if (tracking && 300 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) 301 return ret; 302 303 /* don't print the message below for VHT mismatch if VHT is disabled */ 304 if (ret & IEEE80211_STA_DISABLE_VHT) 305 vht_chandef = *chandef; 306 307 /* 308 * Ignore the DISABLED flag when we're already connected and only 309 * tracking the APs beacon for bandwidth changes - otherwise we 310 * might get disconnected here if we connect to an AP, update our 311 * regulatory information based on the AP's country IE and the 312 * information we have is wrong/outdated and disables the channel 313 * that we're actually using for the connection to the AP. 314 */ 315 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 316 tracking ? 0 : 317 IEEE80211_CHAN_DISABLED)) { 318 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 319 ret = IEEE80211_STA_DISABLE_HT | 320 IEEE80211_STA_DISABLE_VHT; 321 break; 322 } 323 324 ret |= ieee80211_chandef_downgrade(chandef); 325 } 326 327 if (chandef->width != vht_chandef.width && !tracking) 328 sdata_info(sdata, 329 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 330 331 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 332 return ret; 333 } 334 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 336 struct sta_info *sta, 337 const struct ieee80211_ht_cap *ht_cap, 338 const struct ieee80211_ht_operation *ht_oper, 339 const struct ieee80211_vht_operation *vht_oper, 340 const u8 *bssid, u32 *changed) 341 { 342 struct ieee80211_local *local = sdata->local; 343 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 344 struct ieee80211_supported_band *sband; 345 struct ieee80211_channel *chan; 346 struct cfg80211_chan_def chandef; 347 u16 ht_opmode; 348 u32 flags; 349 enum ieee80211_sta_rx_bandwidth new_sta_bw; 350 int ret; 351 352 /* if HT was/is disabled, don't track any bandwidth changes */ 353 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 354 return 0; 355 356 /* don't check VHT if we associated as non-VHT station */ 357 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 358 vht_oper = NULL; 359 360 if (WARN_ON_ONCE(!sta)) 361 return -EINVAL; 362 363 /* 364 * if bss configuration changed store the new one - 365 * this may be applicable even if channel is identical 366 */ 367 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 368 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 369 *changed |= BSS_CHANGED_HT; 370 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 371 } 372 373 chan = sdata->vif.bss_conf.chandef.chan; 374 sband = local->hw.wiphy->bands[chan->band]; 375 376 /* calculate new channel (type) based on HT/VHT operation IEs */ 377 flags = ieee80211_determine_chantype(sdata, sband, chan, 378 ht_cap, ht_oper, vht_oper, 379 &chandef, true); 380 381 /* 382 * Downgrade the new channel if we associated with restricted 383 * capabilities. For example, if we associated as a 20 MHz STA 384 * to a 40 MHz AP (due to regulatory, capabilities or config 385 * reasons) then switching to a 40 MHz channel now won't do us 386 * any good -- we couldn't use it with the AP. 387 */ 388 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 389 chandef.width == NL80211_CHAN_WIDTH_80P80) 390 flags |= ieee80211_chandef_downgrade(&chandef); 391 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 392 chandef.width == NL80211_CHAN_WIDTH_160) 393 flags |= ieee80211_chandef_downgrade(&chandef); 394 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 395 chandef.width > NL80211_CHAN_WIDTH_20) 396 flags |= ieee80211_chandef_downgrade(&chandef); 397 398 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 399 return 0; 400 401 sdata_info(sdata, 402 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 403 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 404 chandef.center_freq1, chandef.center_freq2); 405 406 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 407 IEEE80211_STA_DISABLE_VHT | 408 IEEE80211_STA_DISABLE_40MHZ | 409 IEEE80211_STA_DISABLE_80P80MHZ | 410 IEEE80211_STA_DISABLE_160MHZ)) || 411 !cfg80211_chandef_valid(&chandef)) { 412 sdata_info(sdata, 413 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 414 ifmgd->bssid); 415 return -EINVAL; 416 } 417 418 switch (chandef.width) { 419 case NL80211_CHAN_WIDTH_20_NOHT: 420 case NL80211_CHAN_WIDTH_20: 421 new_sta_bw = IEEE80211_STA_RX_BW_20; 422 break; 423 case NL80211_CHAN_WIDTH_40: 424 new_sta_bw = IEEE80211_STA_RX_BW_40; 425 break; 426 case NL80211_CHAN_WIDTH_80: 427 new_sta_bw = IEEE80211_STA_RX_BW_80; 428 break; 429 case NL80211_CHAN_WIDTH_80P80: 430 case NL80211_CHAN_WIDTH_160: 431 new_sta_bw = IEEE80211_STA_RX_BW_160; 432 break; 433 default: 434 return -EINVAL; 435 } 436 437 if (new_sta_bw > sta->cur_max_bandwidth) 438 new_sta_bw = sta->cur_max_bandwidth; 439 440 if (new_sta_bw < sta->sta.bandwidth) { 441 sta->sta.bandwidth = new_sta_bw; 442 rate_control_rate_update(local, sband, sta, 443 IEEE80211_RC_BW_CHANGED); 444 } 445 446 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 447 if (ret) { 448 sdata_info(sdata, 449 "AP %pM changed bandwidth to incompatible one - disconnect\n", 450 ifmgd->bssid); 451 return ret; 452 } 453 454 if (new_sta_bw > sta->sta.bandwidth) { 455 sta->sta.bandwidth = new_sta_bw; 456 rate_control_rate_update(local, sband, sta, 457 IEEE80211_RC_BW_CHANGED); 458 } 459 460 return 0; 461 } 462 463 /* frame sending functions */ 464 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 466 struct sk_buff *skb, u8 ap_ht_param, 467 struct ieee80211_supported_band *sband, 468 struct ieee80211_channel *channel, 469 enum ieee80211_smps_mode smps) 470 { 471 u8 *pos; 472 u32 flags = channel->flags; 473 u16 cap; 474 struct ieee80211_sta_ht_cap ht_cap; 475 476 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 477 478 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 479 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 480 481 /* determine capability flags */ 482 cap = ht_cap.cap; 483 484 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 485 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 486 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 487 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 488 cap &= ~IEEE80211_HT_CAP_SGI_40; 489 } 490 break; 491 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 492 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 493 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 494 cap &= ~IEEE80211_HT_CAP_SGI_40; 495 } 496 break; 497 } 498 499 /* 500 * If 40 MHz was disabled associate as though we weren't 501 * capable of 40 MHz -- some broken APs will never fall 502 * back to trying to transmit in 20 MHz. 503 */ 504 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 505 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 506 cap &= ~IEEE80211_HT_CAP_SGI_40; 507 } 508 509 /* set SM PS mode properly */ 510 cap &= ~IEEE80211_HT_CAP_SM_PS; 511 switch (smps) { 512 case IEEE80211_SMPS_AUTOMATIC: 513 case IEEE80211_SMPS_NUM_MODES: 514 WARN_ON(1); 515 case IEEE80211_SMPS_OFF: 516 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 517 IEEE80211_HT_CAP_SM_PS_SHIFT; 518 break; 519 case IEEE80211_SMPS_STATIC: 520 cap |= WLAN_HT_CAP_SM_PS_STATIC << 521 IEEE80211_HT_CAP_SM_PS_SHIFT; 522 break; 523 case IEEE80211_SMPS_DYNAMIC: 524 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 525 IEEE80211_HT_CAP_SM_PS_SHIFT; 526 break; 527 } 528 529 /* reserve and fill IE */ 530 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 531 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 532 } 533 534 /* This function determines vht capability flags for the association 535 * and builds the IE. 536 * Note - the function may set the owner of the MU-MIMO capability 537 */ 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 539 struct sk_buff *skb, 540 struct ieee80211_supported_band *sband, 541 struct ieee80211_vht_cap *ap_vht_cap) 542 { 543 struct ieee80211_local *local = sdata->local; 544 u8 *pos; 545 u32 cap; 546 struct ieee80211_sta_vht_cap vht_cap; 547 u32 mask, ap_bf_sts, our_bf_sts; 548 549 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 550 551 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 552 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 553 554 /* determine capability flags */ 555 cap = vht_cap.cap; 556 557 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 558 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 559 560 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 561 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 562 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 563 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 564 } 565 566 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 567 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 568 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 569 } 570 571 /* 572 * Some APs apparently get confused if our capabilities are better 573 * than theirs, so restrict what we advertise in the assoc request. 574 */ 575 if (!(ap_vht_cap->vht_cap_info & 576 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 577 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | 578 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE); 579 else if (!(ap_vht_cap->vht_cap_info & 580 cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE))) 581 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 582 583 /* 584 * If some other vif is using the MU-MIMO capablity we cannot associate 585 * using MU-MIMO - this will lead to contradictions in the group-id 586 * mechanism. 587 * Ownership is defined since association request, in order to avoid 588 * simultaneous associations with MU-MIMO. 589 */ 590 if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) { 591 bool disable_mu_mimo = false; 592 struct ieee80211_sub_if_data *other; 593 594 list_for_each_entry_rcu(other, &local->interfaces, list) { 595 if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) { 596 disable_mu_mimo = true; 597 break; 598 } 599 } 600 if (disable_mu_mimo) 601 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; 602 else 603 sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER; 604 } 605 606 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 607 608 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 609 our_bf_sts = cap & mask; 610 611 if (ap_bf_sts < our_bf_sts) { 612 cap &= ~mask; 613 cap |= ap_bf_sts; 614 } 615 616 /* reserve and fill IE */ 617 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 618 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 619 } 620 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 622 { 623 struct ieee80211_local *local = sdata->local; 624 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 625 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 626 struct sk_buff *skb; 627 struct ieee80211_mgmt *mgmt; 628 u8 *pos, qos_info; 629 size_t offset = 0, noffset; 630 int i, count, rates_len, supp_rates_len, shift; 631 u16 capab; 632 struct ieee80211_supported_band *sband; 633 struct ieee80211_chanctx_conf *chanctx_conf; 634 struct ieee80211_channel *chan; 635 u32 rate_flags, rates = 0; 636 637 sdata_assert_lock(sdata); 638 639 rcu_read_lock(); 640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 641 if (WARN_ON(!chanctx_conf)) { 642 rcu_read_unlock(); 643 return; 644 } 645 chan = chanctx_conf->def.chan; 646 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 647 rcu_read_unlock(); 648 sband = local->hw.wiphy->bands[chan->band]; 649 shift = ieee80211_vif_get_shift(&sdata->vif); 650 651 if (assoc_data->supp_rates_len) { 652 /* 653 * Get all rates supported by the device and the AP as 654 * some APs don't like getting a superset of their rates 655 * in the association request (e.g. D-Link DAP 1353 in 656 * b-only mode)... 657 */ 658 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 659 assoc_data->supp_rates, 660 assoc_data->supp_rates_len, 661 &rates); 662 } else { 663 /* 664 * In case AP not provide any supported rates information 665 * before association, we send information element(s) with 666 * all rates that we support. 667 */ 668 rates_len = 0; 669 for (i = 0; i < sband->n_bitrates; i++) { 670 if ((rate_flags & sband->bitrates[i].flags) 671 != rate_flags) 672 continue; 673 rates |= BIT(i); 674 rates_len++; 675 } 676 } 677 678 skb = alloc_skb(local->hw.extra_tx_headroom + 679 sizeof(*mgmt) + /* bit too much but doesn't matter */ 680 2 + assoc_data->ssid_len + /* SSID */ 681 4 + rates_len + /* (extended) rates */ 682 4 + /* power capability */ 683 2 + 2 * sband->n_channels + /* supported channels */ 684 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 685 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 686 assoc_data->ie_len + /* extra IEs */ 687 9, /* WMM */ 688 GFP_KERNEL); 689 if (!skb) 690 return; 691 692 skb_reserve(skb, local->hw.extra_tx_headroom); 693 694 capab = WLAN_CAPABILITY_ESS; 695 696 if (sband->band == IEEE80211_BAND_2GHZ) { 697 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 698 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 699 } 700 701 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 702 capab |= WLAN_CAPABILITY_PRIVACY; 703 704 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 705 ieee80211_hw_check(&local->hw, SPECTRUM_MGMT)) 706 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 707 708 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 709 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 710 711 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 712 memset(mgmt, 0, 24); 713 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 714 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 715 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 716 717 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 718 skb_put(skb, 10); 719 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 720 IEEE80211_STYPE_REASSOC_REQ); 721 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 722 mgmt->u.reassoc_req.listen_interval = 723 cpu_to_le16(local->hw.conf.listen_interval); 724 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 725 ETH_ALEN); 726 } else { 727 skb_put(skb, 4); 728 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 729 IEEE80211_STYPE_ASSOC_REQ); 730 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 731 mgmt->u.assoc_req.listen_interval = 732 cpu_to_le16(local->hw.conf.listen_interval); 733 } 734 735 /* SSID */ 736 pos = skb_put(skb, 2 + assoc_data->ssid_len); 737 *pos++ = WLAN_EID_SSID; 738 *pos++ = assoc_data->ssid_len; 739 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 740 741 /* add all rates which were marked to be used above */ 742 supp_rates_len = rates_len; 743 if (supp_rates_len > 8) 744 supp_rates_len = 8; 745 746 pos = skb_put(skb, supp_rates_len + 2); 747 *pos++ = WLAN_EID_SUPP_RATES; 748 *pos++ = supp_rates_len; 749 750 count = 0; 751 for (i = 0; i < sband->n_bitrates; i++) { 752 if (BIT(i) & rates) { 753 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 754 5 * (1 << shift)); 755 *pos++ = (u8) rate; 756 if (++count == 8) 757 break; 758 } 759 } 760 761 if (rates_len > count) { 762 pos = skb_put(skb, rates_len - count + 2); 763 *pos++ = WLAN_EID_EXT_SUPP_RATES; 764 *pos++ = rates_len - count; 765 766 for (i++; i < sband->n_bitrates; i++) { 767 if (BIT(i) & rates) { 768 int rate; 769 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 770 5 * (1 << shift)); 771 *pos++ = (u8) rate; 772 } 773 } 774 } 775 776 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 777 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 778 pos = skb_put(skb, 4); 779 *pos++ = WLAN_EID_PWR_CAPABILITY; 780 *pos++ = 2; 781 *pos++ = 0; /* min tx power */ 782 /* max tx power */ 783 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 784 } 785 786 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 787 /* TODO: get this in reg domain format */ 788 pos = skb_put(skb, 2 * sband->n_channels + 2); 789 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 790 *pos++ = 2 * sband->n_channels; 791 for (i = 0; i < sband->n_channels; i++) { 792 *pos++ = ieee80211_frequency_to_channel( 793 sband->channels[i].center_freq); 794 *pos++ = 1; /* one channel in the subband*/ 795 } 796 } 797 798 /* if present, add any custom IEs that go before HT */ 799 if (assoc_data->ie_len) { 800 static const u8 before_ht[] = { 801 WLAN_EID_SSID, 802 WLAN_EID_SUPP_RATES, 803 WLAN_EID_EXT_SUPP_RATES, 804 WLAN_EID_PWR_CAPABILITY, 805 WLAN_EID_SUPPORTED_CHANNELS, 806 WLAN_EID_RSN, 807 WLAN_EID_QOS_CAPA, 808 WLAN_EID_RRM_ENABLED_CAPABILITIES, 809 WLAN_EID_MOBILITY_DOMAIN, 810 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 811 WLAN_EID_RIC_DATA, /* reassoc only */ 812 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 813 }; 814 static const u8 after_ric[] = { 815 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 816 WLAN_EID_HT_CAPABILITY, 817 WLAN_EID_BSS_COEX_2040, 818 WLAN_EID_EXT_CAPABILITY, 819 WLAN_EID_QOS_TRAFFIC_CAPA, 820 WLAN_EID_TIM_BCAST_REQ, 821 WLAN_EID_INTERWORKING, 822 /* 60GHz doesn't happen right now */ 823 WLAN_EID_VHT_CAPABILITY, 824 WLAN_EID_OPMODE_NOTIF, 825 }; 826 827 noffset = ieee80211_ie_split_ric(assoc_data->ie, 828 assoc_data->ie_len, 829 before_ht, 830 ARRAY_SIZE(before_ht), 831 after_ric, 832 ARRAY_SIZE(after_ric), 833 offset); 834 pos = skb_put(skb, noffset - offset); 835 memcpy(pos, assoc_data->ie + offset, noffset - offset); 836 offset = noffset; 837 } 838 839 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 840 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 841 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 842 843 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 844 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 845 sband, chan, sdata->smps_mode); 846 847 /* if present, add any custom IEs that go before VHT */ 848 if (assoc_data->ie_len) { 849 static const u8 before_vht[] = { 850 WLAN_EID_SSID, 851 WLAN_EID_SUPP_RATES, 852 WLAN_EID_EXT_SUPP_RATES, 853 WLAN_EID_PWR_CAPABILITY, 854 WLAN_EID_SUPPORTED_CHANNELS, 855 WLAN_EID_RSN, 856 WLAN_EID_QOS_CAPA, 857 WLAN_EID_RRM_ENABLED_CAPABILITIES, 858 WLAN_EID_MOBILITY_DOMAIN, 859 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 860 WLAN_EID_HT_CAPABILITY, 861 WLAN_EID_BSS_COEX_2040, 862 WLAN_EID_EXT_CAPABILITY, 863 WLAN_EID_QOS_TRAFFIC_CAPA, 864 WLAN_EID_TIM_BCAST_REQ, 865 WLAN_EID_INTERWORKING, 866 }; 867 868 /* RIC already taken above, so no need to handle here anymore */ 869 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 870 before_vht, ARRAY_SIZE(before_vht), 871 offset); 872 pos = skb_put(skb, noffset - offset); 873 memcpy(pos, assoc_data->ie + offset, noffset - offset); 874 offset = noffset; 875 } 876 877 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 878 ieee80211_add_vht_ie(sdata, skb, sband, 879 &assoc_data->ap_vht_cap); 880 881 /* if present, add any custom non-vendor IEs that go after HT */ 882 if (assoc_data->ie_len) { 883 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 884 assoc_data->ie_len, 885 offset); 886 pos = skb_put(skb, noffset - offset); 887 memcpy(pos, assoc_data->ie + offset, noffset - offset); 888 offset = noffset; 889 } 890 891 if (assoc_data->wmm) { 892 if (assoc_data->uapsd) { 893 qos_info = ifmgd->uapsd_queues; 894 qos_info |= (ifmgd->uapsd_max_sp_len << 895 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 896 } else { 897 qos_info = 0; 898 } 899 900 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 901 } 902 903 /* add any remaining custom (i.e. vendor specific here) IEs */ 904 if (assoc_data->ie_len) { 905 noffset = assoc_data->ie_len; 906 pos = skb_put(skb, noffset - offset); 907 memcpy(pos, assoc_data->ie + offset, noffset - offset); 908 } 909 910 drv_mgd_prepare_tx(local, sdata); 911 912 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 913 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 914 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 915 IEEE80211_TX_INTFL_MLME_CONN_TX; 916 ieee80211_tx_skb(sdata, skb); 917 } 918 919 void ieee80211_send_pspoll(struct ieee80211_local *local, 920 struct ieee80211_sub_if_data *sdata) 921 { 922 struct ieee80211_pspoll *pspoll; 923 struct sk_buff *skb; 924 925 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 926 if (!skb) 927 return; 928 929 pspoll = (struct ieee80211_pspoll *) skb->data; 930 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 931 932 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 933 ieee80211_tx_skb(sdata, skb); 934 } 935 936 void ieee80211_send_nullfunc(struct ieee80211_local *local, 937 struct ieee80211_sub_if_data *sdata, 938 bool powersave) 939 { 940 struct sk_buff *skb; 941 struct ieee80211_hdr_3addr *nullfunc; 942 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 943 944 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 945 if (!skb) 946 return; 947 948 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 949 if (powersave) 950 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 951 952 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 953 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 954 955 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 956 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 957 958 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 959 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 960 961 ieee80211_tx_skb(sdata, skb); 962 } 963 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 965 struct ieee80211_sub_if_data *sdata) 966 { 967 struct sk_buff *skb; 968 struct ieee80211_hdr *nullfunc; 969 __le16 fc; 970 971 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 972 return; 973 974 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 975 if (!skb) 976 return; 977 978 skb_reserve(skb, local->hw.extra_tx_headroom); 979 980 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 981 memset(nullfunc, 0, 30); 982 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 983 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 984 nullfunc->frame_control = fc; 985 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 986 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 987 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 988 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 989 990 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 991 ieee80211_tx_skb(sdata, skb); 992 } 993 994 /* spectrum management related things */ 995 static void ieee80211_chswitch_work(struct work_struct *work) 996 { 997 struct ieee80211_sub_if_data *sdata = 998 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 999 struct ieee80211_local *local = sdata->local; 1000 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1001 int ret; 1002 1003 if (!ieee80211_sdata_running(sdata)) 1004 return; 1005 1006 sdata_lock(sdata); 1007 mutex_lock(&local->mtx); 1008 mutex_lock(&local->chanctx_mtx); 1009 1010 if (!ifmgd->associated) 1011 goto out; 1012 1013 if (!sdata->vif.csa_active) 1014 goto out; 1015 1016 /* 1017 * using reservation isn't immediate as it may be deferred until later 1018 * with multi-vif. once reservation is complete it will re-schedule the 1019 * work with no reserved_chanctx so verify chandef to check if it 1020 * completed successfully 1021 */ 1022 1023 if (sdata->reserved_chanctx) { 1024 /* 1025 * with multi-vif csa driver may call ieee80211_csa_finish() 1026 * many times while waiting for other interfaces to use their 1027 * reservations 1028 */ 1029 if (sdata->reserved_ready) 1030 goto out; 1031 1032 ret = ieee80211_vif_use_reserved_context(sdata); 1033 if (ret) { 1034 sdata_info(sdata, 1035 "failed to use reserved channel context, disconnecting (err=%d)\n", 1036 ret); 1037 ieee80211_queue_work(&sdata->local->hw, 1038 &ifmgd->csa_connection_drop_work); 1039 goto out; 1040 } 1041 1042 goto out; 1043 } 1044 1045 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 1046 &sdata->csa_chandef)) { 1047 sdata_info(sdata, 1048 "failed to finalize channel switch, disconnecting\n"); 1049 ieee80211_queue_work(&sdata->local->hw, 1050 &ifmgd->csa_connection_drop_work); 1051 goto out; 1052 } 1053 1054 /* XXX: shouldn't really modify cfg80211-owned data! */ 1055 ifmgd->associated->channel = sdata->csa_chandef.chan; 1056 1057 ifmgd->csa_waiting_bcn = true; 1058 1059 ieee80211_sta_reset_beacon_monitor(sdata); 1060 ieee80211_sta_reset_conn_monitor(sdata); 1061 1062 out: 1063 mutex_unlock(&local->chanctx_mtx); 1064 mutex_unlock(&local->mtx); 1065 sdata_unlock(sdata); 1066 } 1067 1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1069 { 1070 struct ieee80211_local *local = sdata->local; 1071 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1072 int ret; 1073 1074 sdata_assert_lock(sdata); 1075 1076 WARN_ON(!sdata->vif.csa_active); 1077 1078 if (sdata->csa_block_tx) { 1079 ieee80211_wake_vif_queues(local, sdata, 1080 IEEE80211_QUEUE_STOP_REASON_CSA); 1081 sdata->csa_block_tx = false; 1082 } 1083 1084 sdata->vif.csa_active = false; 1085 ifmgd->csa_waiting_bcn = false; 1086 1087 ret = drv_post_channel_switch(sdata); 1088 if (ret) { 1089 sdata_info(sdata, 1090 "driver post channel switch failed, disconnecting\n"); 1091 ieee80211_queue_work(&local->hw, 1092 &ifmgd->csa_connection_drop_work); 1093 return; 1094 } 1095 1096 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1097 } 1098 1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1100 { 1101 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1102 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1103 1104 trace_api_chswitch_done(sdata, success); 1105 if (!success) { 1106 sdata_info(sdata, 1107 "driver channel switch failed, disconnecting\n"); 1108 ieee80211_queue_work(&sdata->local->hw, 1109 &ifmgd->csa_connection_drop_work); 1110 } else { 1111 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1112 } 1113 } 1114 EXPORT_SYMBOL(ieee80211_chswitch_done); 1115 1116 static void ieee80211_chswitch_timer(unsigned long data) 1117 { 1118 struct ieee80211_sub_if_data *sdata = 1119 (struct ieee80211_sub_if_data *) data; 1120 1121 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1122 } 1123 1124 static void 1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1126 u64 timestamp, u32 device_timestamp, 1127 struct ieee802_11_elems *elems, 1128 bool beacon) 1129 { 1130 struct ieee80211_local *local = sdata->local; 1131 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1132 struct cfg80211_bss *cbss = ifmgd->associated; 1133 struct ieee80211_chanctx_conf *conf; 1134 struct ieee80211_chanctx *chanctx; 1135 enum ieee80211_band current_band; 1136 struct ieee80211_csa_ie csa_ie; 1137 struct ieee80211_channel_switch ch_switch; 1138 int res; 1139 1140 sdata_assert_lock(sdata); 1141 1142 if (!cbss) 1143 return; 1144 1145 if (local->scanning) 1146 return; 1147 1148 /* disregard subsequent announcements if we are already processing */ 1149 if (sdata->vif.csa_active) 1150 return; 1151 1152 current_band = cbss->channel->band; 1153 memset(&csa_ie, 0, sizeof(csa_ie)); 1154 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1155 ifmgd->flags, 1156 ifmgd->associated->bssid, &csa_ie); 1157 if (res < 0) 1158 ieee80211_queue_work(&local->hw, 1159 &ifmgd->csa_connection_drop_work); 1160 if (res) 1161 return; 1162 1163 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1164 IEEE80211_CHAN_DISABLED)) { 1165 sdata_info(sdata, 1166 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1167 ifmgd->associated->bssid, 1168 csa_ie.chandef.chan->center_freq, 1169 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1170 csa_ie.chandef.center_freq2); 1171 ieee80211_queue_work(&local->hw, 1172 &ifmgd->csa_connection_drop_work); 1173 return; 1174 } 1175 1176 if (cfg80211_chandef_identical(&csa_ie.chandef, 1177 &sdata->vif.bss_conf.chandef)) { 1178 if (ifmgd->csa_ignored_same_chan) 1179 return; 1180 sdata_info(sdata, 1181 "AP %pM tries to chanswitch to same channel, ignore\n", 1182 ifmgd->associated->bssid); 1183 ifmgd->csa_ignored_same_chan = true; 1184 return; 1185 } 1186 1187 /* 1188 * Drop all TDLS peers - either we disconnect or move to a different 1189 * channel from this point on. There's no telling what our peer will do. 1190 * The TDLS WIDER_BW scenario is also problematic, as peers might now 1191 * have an incompatible wider chandef. 1192 */ 1193 ieee80211_teardown_tdls_peers(sdata); 1194 1195 mutex_lock(&local->mtx); 1196 mutex_lock(&local->chanctx_mtx); 1197 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1198 lockdep_is_held(&local->chanctx_mtx)); 1199 if (!conf) { 1200 sdata_info(sdata, 1201 "no channel context assigned to vif?, disconnecting\n"); 1202 goto drop_connection; 1203 } 1204 1205 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1206 1207 if (local->use_chanctx && 1208 !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) { 1209 sdata_info(sdata, 1210 "driver doesn't support chan-switch with channel contexts\n"); 1211 goto drop_connection; 1212 } 1213 1214 ch_switch.timestamp = timestamp; 1215 ch_switch.device_timestamp = device_timestamp; 1216 ch_switch.block_tx = csa_ie.mode; 1217 ch_switch.chandef = csa_ie.chandef; 1218 ch_switch.count = csa_ie.count; 1219 1220 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1221 sdata_info(sdata, 1222 "preparing for channel switch failed, disconnecting\n"); 1223 goto drop_connection; 1224 } 1225 1226 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1227 chanctx->mode, false); 1228 if (res) { 1229 sdata_info(sdata, 1230 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1231 res); 1232 goto drop_connection; 1233 } 1234 mutex_unlock(&local->chanctx_mtx); 1235 1236 sdata->vif.csa_active = true; 1237 sdata->csa_chandef = csa_ie.chandef; 1238 sdata->csa_block_tx = csa_ie.mode; 1239 ifmgd->csa_ignored_same_chan = false; 1240 1241 if (sdata->csa_block_tx) 1242 ieee80211_stop_vif_queues(local, sdata, 1243 IEEE80211_QUEUE_STOP_REASON_CSA); 1244 mutex_unlock(&local->mtx); 1245 1246 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1247 csa_ie.count); 1248 1249 if (local->ops->channel_switch) { 1250 /* use driver's channel switch callback */ 1251 drv_channel_switch(local, sdata, &ch_switch); 1252 return; 1253 } 1254 1255 /* channel switch handled in software */ 1256 if (csa_ie.count <= 1) 1257 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1258 else 1259 mod_timer(&ifmgd->chswitch_timer, 1260 TU_TO_EXP_TIME((csa_ie.count - 1) * 1261 cbss->beacon_interval)); 1262 return; 1263 drop_connection: 1264 ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); 1265 mutex_unlock(&local->chanctx_mtx); 1266 mutex_unlock(&local->mtx); 1267 } 1268 1269 static bool 1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1271 struct ieee80211_channel *channel, 1272 const u8 *country_ie, u8 country_ie_len, 1273 const u8 *pwr_constr_elem, 1274 int *chan_pwr, int *pwr_reduction) 1275 { 1276 struct ieee80211_country_ie_triplet *triplet; 1277 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1278 int i, chan_increment; 1279 bool have_chan_pwr = false; 1280 1281 /* Invalid IE */ 1282 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1283 return false; 1284 1285 triplet = (void *)(country_ie + 3); 1286 country_ie_len -= 3; 1287 1288 switch (channel->band) { 1289 default: 1290 WARN_ON_ONCE(1); 1291 /* fall through */ 1292 case IEEE80211_BAND_2GHZ: 1293 case IEEE80211_BAND_60GHZ: 1294 chan_increment = 1; 1295 break; 1296 case IEEE80211_BAND_5GHZ: 1297 chan_increment = 4; 1298 break; 1299 } 1300 1301 /* find channel */ 1302 while (country_ie_len >= 3) { 1303 u8 first_channel = triplet->chans.first_channel; 1304 1305 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1306 goto next; 1307 1308 for (i = 0; i < triplet->chans.num_channels; i++) { 1309 if (first_channel + i * chan_increment == chan) { 1310 have_chan_pwr = true; 1311 *chan_pwr = triplet->chans.max_power; 1312 break; 1313 } 1314 } 1315 if (have_chan_pwr) 1316 break; 1317 1318 next: 1319 triplet++; 1320 country_ie_len -= 3; 1321 } 1322 1323 if (have_chan_pwr && pwr_constr_elem) 1324 *pwr_reduction = *pwr_constr_elem; 1325 else 1326 *pwr_reduction = 0; 1327 1328 return have_chan_pwr; 1329 } 1330 1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1332 struct ieee80211_channel *channel, 1333 const u8 *cisco_dtpc_ie, 1334 int *pwr_level) 1335 { 1336 /* From practical testing, the first data byte of the DTPC element 1337 * seems to contain the requested dBm level, and the CLI on Cisco 1338 * APs clearly state the range is -127 to 127 dBm, which indicates 1339 * a signed byte, although it seemingly never actually goes negative. 1340 * The other byte seems to always be zero. 1341 */ 1342 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1343 } 1344 1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1346 struct ieee80211_channel *channel, 1347 struct ieee80211_mgmt *mgmt, 1348 const u8 *country_ie, u8 country_ie_len, 1349 const u8 *pwr_constr_ie, 1350 const u8 *cisco_dtpc_ie) 1351 { 1352 bool has_80211h_pwr = false, has_cisco_pwr = false; 1353 int chan_pwr = 0, pwr_reduction_80211h = 0; 1354 int pwr_level_cisco, pwr_level_80211h; 1355 int new_ap_level; 1356 __le16 capab = mgmt->u.probe_resp.capab_info; 1357 1358 if (country_ie && 1359 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1360 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1361 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1362 sdata, channel, country_ie, country_ie_len, 1363 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1364 pwr_level_80211h = 1365 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1366 } 1367 1368 if (cisco_dtpc_ie) { 1369 ieee80211_find_cisco_dtpc( 1370 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1371 has_cisco_pwr = true; 1372 } 1373 1374 if (!has_80211h_pwr && !has_cisco_pwr) 1375 return 0; 1376 1377 /* If we have both 802.11h and Cisco DTPC, apply both limits 1378 * by picking the smallest of the two power levels advertised. 1379 */ 1380 if (has_80211h_pwr && 1381 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1382 sdata_dbg(sdata, 1383 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1384 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1385 sdata->u.mgd.bssid); 1386 new_ap_level = pwr_level_80211h; 1387 } else { /* has_cisco_pwr is always true here. */ 1388 sdata_dbg(sdata, 1389 "Limiting TX power to %d dBm as advertised by %pM\n", 1390 pwr_level_cisco, sdata->u.mgd.bssid); 1391 new_ap_level = pwr_level_cisco; 1392 } 1393 1394 if (sdata->ap_power_level == new_ap_level) 1395 return 0; 1396 1397 sdata->ap_power_level = new_ap_level; 1398 if (__ieee80211_recalc_txpower(sdata)) 1399 return BSS_CHANGED_TXPOWER; 1400 return 0; 1401 } 1402 1403 /* powersave */ 1404 static void ieee80211_enable_ps(struct ieee80211_local *local, 1405 struct ieee80211_sub_if_data *sdata) 1406 { 1407 struct ieee80211_conf *conf = &local->hw.conf; 1408 1409 /* 1410 * If we are scanning right now then the parameters will 1411 * take effect when scan finishes. 1412 */ 1413 if (local->scanning) 1414 return; 1415 1416 if (conf->dynamic_ps_timeout > 0 && 1417 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1418 mod_timer(&local->dynamic_ps_timer, jiffies + 1419 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1420 } else { 1421 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1422 ieee80211_send_nullfunc(local, sdata, true); 1423 1424 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1425 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1426 return; 1427 1428 conf->flags |= IEEE80211_CONF_PS; 1429 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1430 } 1431 } 1432 1433 static void ieee80211_change_ps(struct ieee80211_local *local) 1434 { 1435 struct ieee80211_conf *conf = &local->hw.conf; 1436 1437 if (local->ps_sdata) { 1438 ieee80211_enable_ps(local, local->ps_sdata); 1439 } else if (conf->flags & IEEE80211_CONF_PS) { 1440 conf->flags &= ~IEEE80211_CONF_PS; 1441 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1442 del_timer_sync(&local->dynamic_ps_timer); 1443 cancel_work_sync(&local->dynamic_ps_enable_work); 1444 } 1445 } 1446 1447 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1448 { 1449 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1450 struct sta_info *sta = NULL; 1451 bool authorized = false; 1452 1453 if (!mgd->powersave) 1454 return false; 1455 1456 if (mgd->broken_ap) 1457 return false; 1458 1459 if (!mgd->associated) 1460 return false; 1461 1462 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1463 return false; 1464 1465 if (!mgd->have_beacon) 1466 return false; 1467 1468 rcu_read_lock(); 1469 sta = sta_info_get(sdata, mgd->bssid); 1470 if (sta) 1471 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1472 rcu_read_unlock(); 1473 1474 return authorized; 1475 } 1476 1477 /* need to hold RTNL or interface lock */ 1478 void ieee80211_recalc_ps(struct ieee80211_local *local) 1479 { 1480 struct ieee80211_sub_if_data *sdata, *found = NULL; 1481 int count = 0; 1482 int timeout; 1483 1484 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1485 local->ps_sdata = NULL; 1486 return; 1487 } 1488 1489 list_for_each_entry(sdata, &local->interfaces, list) { 1490 if (!ieee80211_sdata_running(sdata)) 1491 continue; 1492 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1493 /* If an AP vif is found, then disable PS 1494 * by setting the count to zero thereby setting 1495 * ps_sdata to NULL. 1496 */ 1497 count = 0; 1498 break; 1499 } 1500 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1501 continue; 1502 found = sdata; 1503 count++; 1504 } 1505 1506 if (count == 1 && ieee80211_powersave_allowed(found)) { 1507 u8 dtimper = found->u.mgd.dtim_period; 1508 s32 beaconint_us; 1509 1510 beaconint_us = ieee80211_tu_to_usec( 1511 found->vif.bss_conf.beacon_int); 1512 1513 timeout = local->dynamic_ps_forced_timeout; 1514 if (timeout < 0) 1515 timeout = 100; 1516 local->hw.conf.dynamic_ps_timeout = timeout; 1517 1518 /* If the TIM IE is invalid, pretend the value is 1 */ 1519 if (!dtimper) 1520 dtimper = 1; 1521 1522 local->hw.conf.ps_dtim_period = dtimper; 1523 local->ps_sdata = found; 1524 } else { 1525 local->ps_sdata = NULL; 1526 } 1527 1528 ieee80211_change_ps(local); 1529 } 1530 1531 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1532 { 1533 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1534 1535 if (sdata->vif.bss_conf.ps != ps_allowed) { 1536 sdata->vif.bss_conf.ps = ps_allowed; 1537 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1538 } 1539 } 1540 1541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1542 { 1543 struct ieee80211_local *local = 1544 container_of(work, struct ieee80211_local, 1545 dynamic_ps_disable_work); 1546 1547 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1548 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1549 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1550 } 1551 1552 ieee80211_wake_queues_by_reason(&local->hw, 1553 IEEE80211_MAX_QUEUE_MAP, 1554 IEEE80211_QUEUE_STOP_REASON_PS, 1555 false); 1556 } 1557 1558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1559 { 1560 struct ieee80211_local *local = 1561 container_of(work, struct ieee80211_local, 1562 dynamic_ps_enable_work); 1563 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1564 struct ieee80211_if_managed *ifmgd; 1565 unsigned long flags; 1566 int q; 1567 1568 /* can only happen when PS was just disabled anyway */ 1569 if (!sdata) 1570 return; 1571 1572 ifmgd = &sdata->u.mgd; 1573 1574 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1575 return; 1576 1577 if (local->hw.conf.dynamic_ps_timeout > 0) { 1578 /* don't enter PS if TX frames are pending */ 1579 if (drv_tx_frames_pending(local)) { 1580 mod_timer(&local->dynamic_ps_timer, jiffies + 1581 msecs_to_jiffies( 1582 local->hw.conf.dynamic_ps_timeout)); 1583 return; 1584 } 1585 1586 /* 1587 * transmission can be stopped by others which leads to 1588 * dynamic_ps_timer expiry. Postpone the ps timer if it 1589 * is not the actual idle state. 1590 */ 1591 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1592 for (q = 0; q < local->hw.queues; q++) { 1593 if (local->queue_stop_reasons[q]) { 1594 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1595 flags); 1596 mod_timer(&local->dynamic_ps_timer, jiffies + 1597 msecs_to_jiffies( 1598 local->hw.conf.dynamic_ps_timeout)); 1599 return; 1600 } 1601 } 1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1603 } 1604 1605 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1606 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1607 if (drv_tx_frames_pending(local)) { 1608 mod_timer(&local->dynamic_ps_timer, jiffies + 1609 msecs_to_jiffies( 1610 local->hw.conf.dynamic_ps_timeout)); 1611 } else { 1612 ieee80211_send_nullfunc(local, sdata, true); 1613 /* Flush to get the tx status of nullfunc frame */ 1614 ieee80211_flush_queues(local, sdata, false); 1615 } 1616 } 1617 1618 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1619 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1620 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1621 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1622 local->hw.conf.flags |= IEEE80211_CONF_PS; 1623 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1624 } 1625 } 1626 1627 void ieee80211_dynamic_ps_timer(unsigned long data) 1628 { 1629 struct ieee80211_local *local = (void *) data; 1630 1631 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1632 } 1633 1634 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1635 { 1636 struct delayed_work *delayed_work = 1637 container_of(work, struct delayed_work, work); 1638 struct ieee80211_sub_if_data *sdata = 1639 container_of(delayed_work, struct ieee80211_sub_if_data, 1640 dfs_cac_timer_work); 1641 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1642 1643 mutex_lock(&sdata->local->mtx); 1644 if (sdata->wdev.cac_started) { 1645 ieee80211_vif_release_channel(sdata); 1646 cfg80211_cac_event(sdata->dev, &chandef, 1647 NL80211_RADAR_CAC_FINISHED, 1648 GFP_KERNEL); 1649 } 1650 mutex_unlock(&sdata->local->mtx); 1651 } 1652 1653 static bool 1654 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1655 { 1656 struct ieee80211_local *local = sdata->local; 1657 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1658 bool ret = false; 1659 int ac; 1660 1661 if (local->hw.queues < IEEE80211_NUM_ACS) 1662 return false; 1663 1664 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1665 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1666 int non_acm_ac; 1667 unsigned long now = jiffies; 1668 1669 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1670 tx_tspec->admitted_time && 1671 time_after(now, tx_tspec->time_slice_start + HZ)) { 1672 tx_tspec->consumed_tx_time = 0; 1673 tx_tspec->time_slice_start = now; 1674 1675 if (tx_tspec->downgraded) 1676 tx_tspec->action = 1677 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1678 } 1679 1680 switch (tx_tspec->action) { 1681 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1682 /* take the original parameters */ 1683 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1684 sdata_err(sdata, 1685 "failed to set TX queue parameters for queue %d\n", 1686 ac); 1687 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1688 tx_tspec->downgraded = false; 1689 ret = true; 1690 break; 1691 case TX_TSPEC_ACTION_DOWNGRADE: 1692 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1693 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1694 ret = true; 1695 break; 1696 } 1697 /* downgrade next lower non-ACM AC */ 1698 for (non_acm_ac = ac + 1; 1699 non_acm_ac < IEEE80211_NUM_ACS; 1700 non_acm_ac++) 1701 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1702 break; 1703 /* The loop will result in using BK even if it requires 1704 * admission control, such configuration makes no sense 1705 * and we have to transmit somehow - the AC selection 1706 * does the same thing. 1707 */ 1708 if (drv_conf_tx(local, sdata, ac, 1709 &sdata->tx_conf[non_acm_ac])) 1710 sdata_err(sdata, 1711 "failed to set TX queue parameters for queue %d\n", 1712 ac); 1713 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1714 ret = true; 1715 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1716 tx_tspec->time_slice_start + HZ - now + 1); 1717 break; 1718 case TX_TSPEC_ACTION_NONE: 1719 /* nothing now */ 1720 break; 1721 } 1722 } 1723 1724 return ret; 1725 } 1726 1727 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1728 { 1729 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1730 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1731 } 1732 1733 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1734 { 1735 struct ieee80211_sub_if_data *sdata; 1736 1737 sdata = container_of(work, struct ieee80211_sub_if_data, 1738 u.mgd.tx_tspec_wk.work); 1739 ieee80211_sta_handle_tspec_ac_params(sdata); 1740 } 1741 1742 /* MLME */ 1743 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1744 struct ieee80211_sub_if_data *sdata, 1745 const u8 *wmm_param, size_t wmm_param_len) 1746 { 1747 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1748 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1749 size_t left; 1750 int count, ac; 1751 const u8 *pos; 1752 u8 uapsd_queues = 0; 1753 1754 if (!local->ops->conf_tx) 1755 return false; 1756 1757 if (local->hw.queues < IEEE80211_NUM_ACS) 1758 return false; 1759 1760 if (!wmm_param) 1761 return false; 1762 1763 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1764 return false; 1765 1766 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1767 uapsd_queues = ifmgd->uapsd_queues; 1768 1769 count = wmm_param[6] & 0x0f; 1770 if (count == ifmgd->wmm_last_param_set) 1771 return false; 1772 ifmgd->wmm_last_param_set = count; 1773 1774 pos = wmm_param + 8; 1775 left = wmm_param_len - 8; 1776 1777 memset(¶ms, 0, sizeof(params)); 1778 1779 sdata->wmm_acm = 0; 1780 for (; left >= 4; left -= 4, pos += 4) { 1781 int aci = (pos[0] >> 5) & 0x03; 1782 int acm = (pos[0] >> 4) & 0x01; 1783 bool uapsd = false; 1784 1785 switch (aci) { 1786 case 1: /* AC_BK */ 1787 ac = IEEE80211_AC_BK; 1788 if (acm) 1789 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1790 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1791 uapsd = true; 1792 break; 1793 case 2: /* AC_VI */ 1794 ac = IEEE80211_AC_VI; 1795 if (acm) 1796 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1797 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1798 uapsd = true; 1799 break; 1800 case 3: /* AC_VO */ 1801 ac = IEEE80211_AC_VO; 1802 if (acm) 1803 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1804 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1805 uapsd = true; 1806 break; 1807 case 0: /* AC_BE */ 1808 default: 1809 ac = IEEE80211_AC_BE; 1810 if (acm) 1811 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1812 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1813 uapsd = true; 1814 break; 1815 } 1816 1817 params[ac].aifs = pos[0] & 0x0f; 1818 1819 if (params[ac].aifs < 2) { 1820 sdata_info(sdata, 1821 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1822 params[ac].aifs, aci); 1823 params[ac].aifs = 2; 1824 } 1825 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1826 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1827 params[ac].txop = get_unaligned_le16(pos + 2); 1828 params[ac].acm = acm; 1829 params[ac].uapsd = uapsd; 1830 1831 if (params[ac].cw_min > params[ac].cw_max) { 1832 sdata_info(sdata, 1833 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1834 params[ac].cw_min, params[ac].cw_max, aci); 1835 return false; 1836 } 1837 } 1838 1839 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1840 mlme_dbg(sdata, 1841 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1842 ac, params[ac].acm, 1843 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1844 params[ac].txop, params[ac].uapsd, 1845 ifmgd->tx_tspec[ac].downgraded); 1846 sdata->tx_conf[ac] = params[ac]; 1847 if (!ifmgd->tx_tspec[ac].downgraded && 1848 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1849 sdata_err(sdata, 1850 "failed to set TX queue parameters for AC %d\n", 1851 ac); 1852 } 1853 1854 /* enable WMM or activate new settings */ 1855 sdata->vif.bss_conf.qos = true; 1856 return true; 1857 } 1858 1859 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1860 { 1861 lockdep_assert_held(&sdata->local->mtx); 1862 1863 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1864 ieee80211_run_deferred_scan(sdata->local); 1865 } 1866 1867 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1868 { 1869 mutex_lock(&sdata->local->mtx); 1870 __ieee80211_stop_poll(sdata); 1871 mutex_unlock(&sdata->local->mtx); 1872 } 1873 1874 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1875 u16 capab, bool erp_valid, u8 erp) 1876 { 1877 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1878 u32 changed = 0; 1879 bool use_protection; 1880 bool use_short_preamble; 1881 bool use_short_slot; 1882 1883 if (erp_valid) { 1884 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1885 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1886 } else { 1887 use_protection = false; 1888 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1889 } 1890 1891 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1892 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1893 use_short_slot = true; 1894 1895 if (use_protection != bss_conf->use_cts_prot) { 1896 bss_conf->use_cts_prot = use_protection; 1897 changed |= BSS_CHANGED_ERP_CTS_PROT; 1898 } 1899 1900 if (use_short_preamble != bss_conf->use_short_preamble) { 1901 bss_conf->use_short_preamble = use_short_preamble; 1902 changed |= BSS_CHANGED_ERP_PREAMBLE; 1903 } 1904 1905 if (use_short_slot != bss_conf->use_short_slot) { 1906 bss_conf->use_short_slot = use_short_slot; 1907 changed |= BSS_CHANGED_ERP_SLOT; 1908 } 1909 1910 return changed; 1911 } 1912 1913 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1914 struct cfg80211_bss *cbss, 1915 u32 bss_info_changed) 1916 { 1917 struct ieee80211_bss *bss = (void *)cbss->priv; 1918 struct ieee80211_local *local = sdata->local; 1919 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1920 1921 bss_info_changed |= BSS_CHANGED_ASSOC; 1922 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1923 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1924 1925 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1926 beacon_loss_count * bss_conf->beacon_int)); 1927 1928 sdata->u.mgd.associated = cbss; 1929 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1930 1931 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1932 1933 if (sdata->vif.p2p) { 1934 const struct cfg80211_bss_ies *ies; 1935 1936 rcu_read_lock(); 1937 ies = rcu_dereference(cbss->ies); 1938 if (ies) { 1939 int ret; 1940 1941 ret = cfg80211_get_p2p_attr( 1942 ies->data, ies->len, 1943 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1944 (u8 *) &bss_conf->p2p_noa_attr, 1945 sizeof(bss_conf->p2p_noa_attr)); 1946 if (ret >= 2) { 1947 sdata->u.mgd.p2p_noa_index = 1948 bss_conf->p2p_noa_attr.index; 1949 bss_info_changed |= BSS_CHANGED_P2P_PS; 1950 } 1951 } 1952 rcu_read_unlock(); 1953 } 1954 1955 /* just to be sure */ 1956 ieee80211_stop_poll(sdata); 1957 1958 ieee80211_led_assoc(local, 1); 1959 1960 if (sdata->u.mgd.have_beacon) { 1961 /* 1962 * If the AP is buggy we may get here with no DTIM period 1963 * known, so assume it's 1 which is the only safe assumption 1964 * in that case, although if the TIM IE is broken powersave 1965 * probably just won't work at all. 1966 */ 1967 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1968 bss_conf->beacon_rate = bss->beacon_rate; 1969 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1970 } else { 1971 bss_conf->beacon_rate = NULL; 1972 bss_conf->dtim_period = 0; 1973 } 1974 1975 bss_conf->assoc = 1; 1976 1977 /* Tell the driver to monitor connection quality (if supported) */ 1978 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1979 bss_conf->cqm_rssi_thold) 1980 bss_info_changed |= BSS_CHANGED_CQM; 1981 1982 /* Enable ARP filtering */ 1983 if (bss_conf->arp_addr_cnt) 1984 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1985 1986 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1987 1988 mutex_lock(&local->iflist_mtx); 1989 ieee80211_recalc_ps(local); 1990 mutex_unlock(&local->iflist_mtx); 1991 1992 ieee80211_recalc_smps(sdata); 1993 ieee80211_recalc_ps_vif(sdata); 1994 1995 netif_carrier_on(sdata->dev); 1996 } 1997 1998 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1999 u16 stype, u16 reason, bool tx, 2000 u8 *frame_buf) 2001 { 2002 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2003 struct ieee80211_local *local = sdata->local; 2004 u32 changed = 0; 2005 2006 sdata_assert_lock(sdata); 2007 2008 if (WARN_ON_ONCE(tx && !frame_buf)) 2009 return; 2010 2011 if (WARN_ON(!ifmgd->associated)) 2012 return; 2013 2014 ieee80211_stop_poll(sdata); 2015 2016 ifmgd->associated = NULL; 2017 netif_carrier_off(sdata->dev); 2018 2019 /* 2020 * if we want to get out of ps before disassoc (why?) we have 2021 * to do it before sending disassoc, as otherwise the null-packet 2022 * won't be valid. 2023 */ 2024 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2025 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2026 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2027 } 2028 local->ps_sdata = NULL; 2029 2030 /* disable per-vif ps */ 2031 ieee80211_recalc_ps_vif(sdata); 2032 2033 /* make sure ongoing transmission finishes */ 2034 synchronize_net(); 2035 2036 /* 2037 * drop any frame before deauth/disassoc, this can be data or 2038 * management frame. Since we are disconnecting, we should not 2039 * insist sending these frames which can take time and delay 2040 * the disconnection and possible the roaming. 2041 */ 2042 if (tx) 2043 ieee80211_flush_queues(local, sdata, true); 2044 2045 /* deauthenticate/disassociate now */ 2046 if (tx || frame_buf) 2047 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2048 reason, tx, frame_buf); 2049 2050 /* flush out frame - make sure the deauth was actually sent */ 2051 if (tx) 2052 ieee80211_flush_queues(local, sdata, false); 2053 2054 /* clear bssid only after building the needed mgmt frames */ 2055 eth_zero_addr(ifmgd->bssid); 2056 2057 /* remove AP and TDLS peers */ 2058 sta_info_flush(sdata); 2059 2060 /* finally reset all BSS / config parameters */ 2061 changed |= ieee80211_reset_erp_info(sdata); 2062 2063 ieee80211_led_assoc(local, 0); 2064 changed |= BSS_CHANGED_ASSOC; 2065 sdata->vif.bss_conf.assoc = false; 2066 2067 ifmgd->p2p_noa_index = -1; 2068 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2069 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2070 2071 /* on the next assoc, re-program HT/VHT parameters */ 2072 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2073 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2074 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2075 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2076 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER; 2077 2078 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2079 2080 del_timer_sync(&local->dynamic_ps_timer); 2081 cancel_work_sync(&local->dynamic_ps_enable_work); 2082 2083 /* Disable ARP filtering */ 2084 if (sdata->vif.bss_conf.arp_addr_cnt) 2085 changed |= BSS_CHANGED_ARP_FILTER; 2086 2087 sdata->vif.bss_conf.qos = false; 2088 changed |= BSS_CHANGED_QOS; 2089 2090 /* The BSSID (not really interesting) and HT changed */ 2091 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2092 ieee80211_bss_info_change_notify(sdata, changed); 2093 2094 /* disassociated - set to defaults now */ 2095 ieee80211_set_wmm_default(sdata, false, false); 2096 2097 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2098 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2099 del_timer_sync(&sdata->u.mgd.timer); 2100 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2101 2102 sdata->vif.bss_conf.dtim_period = 0; 2103 sdata->vif.bss_conf.beacon_rate = NULL; 2104 2105 ifmgd->have_beacon = false; 2106 2107 ifmgd->flags = 0; 2108 mutex_lock(&local->mtx); 2109 ieee80211_vif_release_channel(sdata); 2110 2111 sdata->vif.csa_active = false; 2112 ifmgd->csa_waiting_bcn = false; 2113 ifmgd->csa_ignored_same_chan = false; 2114 if (sdata->csa_block_tx) { 2115 ieee80211_wake_vif_queues(local, sdata, 2116 IEEE80211_QUEUE_STOP_REASON_CSA); 2117 sdata->csa_block_tx = false; 2118 } 2119 mutex_unlock(&local->mtx); 2120 2121 /* existing TX TSPEC sessions no longer exist */ 2122 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2123 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2124 2125 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2126 } 2127 2128 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2129 struct ieee80211_hdr *hdr) 2130 { 2131 /* 2132 * We can postpone the mgd.timer whenever receiving unicast frames 2133 * from AP because we know that the connection is working both ways 2134 * at that time. But multicast frames (and hence also beacons) must 2135 * be ignored here, because we need to trigger the timer during 2136 * data idle periods for sending the periodic probe request to the 2137 * AP we're connected to. 2138 */ 2139 if (is_multicast_ether_addr(hdr->addr1)) 2140 return; 2141 2142 ieee80211_sta_reset_conn_monitor(sdata); 2143 } 2144 2145 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2146 { 2147 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2148 struct ieee80211_local *local = sdata->local; 2149 2150 mutex_lock(&local->mtx); 2151 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2152 goto out; 2153 2154 __ieee80211_stop_poll(sdata); 2155 2156 mutex_lock(&local->iflist_mtx); 2157 ieee80211_recalc_ps(local); 2158 mutex_unlock(&local->iflist_mtx); 2159 2160 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2161 goto out; 2162 2163 /* 2164 * We've received a probe response, but are not sure whether 2165 * we have or will be receiving any beacons or data, so let's 2166 * schedule the timers again, just in case. 2167 */ 2168 ieee80211_sta_reset_beacon_monitor(sdata); 2169 2170 mod_timer(&ifmgd->conn_mon_timer, 2171 round_jiffies_up(jiffies + 2172 IEEE80211_CONNECTION_IDLE_TIME)); 2173 out: 2174 mutex_unlock(&local->mtx); 2175 } 2176 2177 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2178 struct ieee80211_hdr *hdr, 2179 u16 tx_time) 2180 { 2181 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2182 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2183 int ac = ieee80211_ac_from_tid(tid); 2184 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2185 unsigned long now = jiffies; 2186 2187 if (likely(!tx_tspec->admitted_time)) 2188 return; 2189 2190 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2191 tx_tspec->consumed_tx_time = 0; 2192 tx_tspec->time_slice_start = now; 2193 2194 if (tx_tspec->downgraded) { 2195 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2196 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2197 } 2198 } 2199 2200 if (tx_tspec->downgraded) 2201 return; 2202 2203 tx_tspec->consumed_tx_time += tx_time; 2204 2205 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2206 tx_tspec->downgraded = true; 2207 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2208 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2209 } 2210 } 2211 2212 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2213 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2214 { 2215 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2216 2217 if (!ieee80211_is_data(hdr->frame_control)) 2218 return; 2219 2220 if (ieee80211_is_nullfunc(hdr->frame_control) && 2221 sdata->u.mgd.probe_send_count > 0) { 2222 if (ack) 2223 ieee80211_sta_reset_conn_monitor(sdata); 2224 else 2225 sdata->u.mgd.nullfunc_failed = true; 2226 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2227 return; 2228 } 2229 2230 if (ack) 2231 ieee80211_sta_reset_conn_monitor(sdata); 2232 } 2233 2234 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2235 { 2236 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2237 const u8 *ssid; 2238 u8 *dst = ifmgd->associated->bssid; 2239 u8 unicast_limit = max(1, max_probe_tries - 3); 2240 2241 /* 2242 * Try sending broadcast probe requests for the last three 2243 * probe requests after the first ones failed since some 2244 * buggy APs only support broadcast probe requests. 2245 */ 2246 if (ifmgd->probe_send_count >= unicast_limit) 2247 dst = NULL; 2248 2249 /* 2250 * When the hardware reports an accurate Tx ACK status, it's 2251 * better to send a nullfunc frame instead of a probe request, 2252 * as it will kick us off the AP quickly if we aren't associated 2253 * anymore. The timeout will be reset if the frame is ACKed by 2254 * the AP. 2255 */ 2256 ifmgd->probe_send_count++; 2257 2258 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2259 ifmgd->nullfunc_failed = false; 2260 ieee80211_send_nullfunc(sdata->local, sdata, false); 2261 } else { 2262 int ssid_len; 2263 2264 rcu_read_lock(); 2265 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2266 if (WARN_ON_ONCE(ssid == NULL)) 2267 ssid_len = 0; 2268 else 2269 ssid_len = ssid[1]; 2270 2271 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2272 ssid + 2, ssid_len, NULL, 2273 0, (u32) -1, true, 0, 2274 ifmgd->associated->channel, false); 2275 rcu_read_unlock(); 2276 } 2277 2278 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2279 run_again(sdata, ifmgd->probe_timeout); 2280 } 2281 2282 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2283 bool beacon) 2284 { 2285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2286 bool already = false; 2287 2288 if (!ieee80211_sdata_running(sdata)) 2289 return; 2290 2291 sdata_lock(sdata); 2292 2293 if (!ifmgd->associated) 2294 goto out; 2295 2296 mutex_lock(&sdata->local->mtx); 2297 2298 if (sdata->local->tmp_channel || sdata->local->scanning) { 2299 mutex_unlock(&sdata->local->mtx); 2300 goto out; 2301 } 2302 2303 if (beacon) { 2304 mlme_dbg_ratelimited(sdata, 2305 "detected beacon loss from AP (missed %d beacons) - probing\n", 2306 beacon_loss_count); 2307 2308 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2309 } 2310 2311 /* 2312 * The driver/our work has already reported this event or the 2313 * connection monitoring has kicked in and we have already sent 2314 * a probe request. Or maybe the AP died and the driver keeps 2315 * reporting until we disassociate... 2316 * 2317 * In either case we have to ignore the current call to this 2318 * function (except for setting the correct probe reason bit) 2319 * because otherwise we would reset the timer every time and 2320 * never check whether we received a probe response! 2321 */ 2322 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2323 already = true; 2324 2325 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2326 2327 mutex_unlock(&sdata->local->mtx); 2328 2329 if (already) 2330 goto out; 2331 2332 mutex_lock(&sdata->local->iflist_mtx); 2333 ieee80211_recalc_ps(sdata->local); 2334 mutex_unlock(&sdata->local->iflist_mtx); 2335 2336 ifmgd->probe_send_count = 0; 2337 ieee80211_mgd_probe_ap_send(sdata); 2338 out: 2339 sdata_unlock(sdata); 2340 } 2341 2342 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2343 struct ieee80211_vif *vif) 2344 { 2345 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2346 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2347 struct cfg80211_bss *cbss; 2348 struct sk_buff *skb; 2349 const u8 *ssid; 2350 int ssid_len; 2351 2352 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2353 return NULL; 2354 2355 sdata_assert_lock(sdata); 2356 2357 if (ifmgd->associated) 2358 cbss = ifmgd->associated; 2359 else if (ifmgd->auth_data) 2360 cbss = ifmgd->auth_data->bss; 2361 else if (ifmgd->assoc_data) 2362 cbss = ifmgd->assoc_data->bss; 2363 else 2364 return NULL; 2365 2366 rcu_read_lock(); 2367 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2368 if (WARN_ON_ONCE(ssid == NULL)) 2369 ssid_len = 0; 2370 else 2371 ssid_len = ssid[1]; 2372 2373 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2374 (u32) -1, cbss->channel, 2375 ssid + 2, ssid_len, 2376 NULL, 0, true); 2377 rcu_read_unlock(); 2378 2379 return skb; 2380 } 2381 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2382 2383 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2384 const u8 *buf, size_t len, bool tx, 2385 u16 reason) 2386 { 2387 struct ieee80211_event event = { 2388 .type = MLME_EVENT, 2389 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2390 .u.mlme.reason = reason, 2391 }; 2392 2393 if (tx) 2394 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2395 else 2396 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2397 2398 drv_event_callback(sdata->local, sdata, &event); 2399 } 2400 2401 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2402 { 2403 struct ieee80211_local *local = sdata->local; 2404 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2405 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2406 2407 sdata_lock(sdata); 2408 if (!ifmgd->associated) { 2409 sdata_unlock(sdata); 2410 return; 2411 } 2412 2413 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2414 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2415 true, frame_buf); 2416 mutex_lock(&local->mtx); 2417 sdata->vif.csa_active = false; 2418 ifmgd->csa_waiting_bcn = false; 2419 if (sdata->csa_block_tx) { 2420 ieee80211_wake_vif_queues(local, sdata, 2421 IEEE80211_QUEUE_STOP_REASON_CSA); 2422 sdata->csa_block_tx = false; 2423 } 2424 mutex_unlock(&local->mtx); 2425 2426 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2427 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2428 2429 sdata_unlock(sdata); 2430 } 2431 2432 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2433 { 2434 struct ieee80211_sub_if_data *sdata = 2435 container_of(work, struct ieee80211_sub_if_data, 2436 u.mgd.beacon_connection_loss_work); 2437 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2438 2439 if (ifmgd->associated) 2440 ifmgd->beacon_loss_count++; 2441 2442 if (ifmgd->connection_loss) { 2443 sdata_info(sdata, "Connection to AP %pM lost\n", 2444 ifmgd->bssid); 2445 __ieee80211_disconnect(sdata); 2446 } else { 2447 ieee80211_mgd_probe_ap(sdata, true); 2448 } 2449 } 2450 2451 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2452 { 2453 struct ieee80211_sub_if_data *sdata = 2454 container_of(work, struct ieee80211_sub_if_data, 2455 u.mgd.csa_connection_drop_work); 2456 2457 __ieee80211_disconnect(sdata); 2458 } 2459 2460 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2461 { 2462 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2463 struct ieee80211_hw *hw = &sdata->local->hw; 2464 2465 trace_api_beacon_loss(sdata); 2466 2467 sdata->u.mgd.connection_loss = false; 2468 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2469 } 2470 EXPORT_SYMBOL(ieee80211_beacon_loss); 2471 2472 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2473 { 2474 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2475 struct ieee80211_hw *hw = &sdata->local->hw; 2476 2477 trace_api_connection_loss(sdata); 2478 2479 sdata->u.mgd.connection_loss = true; 2480 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2481 } 2482 EXPORT_SYMBOL(ieee80211_connection_loss); 2483 2484 2485 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2486 bool assoc) 2487 { 2488 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2489 2490 sdata_assert_lock(sdata); 2491 2492 if (!assoc) { 2493 /* 2494 * we are not authenticated yet, the only timer that could be 2495 * running is the timeout for the authentication response which 2496 * which is not relevant anymore. 2497 */ 2498 del_timer_sync(&sdata->u.mgd.timer); 2499 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2500 2501 eth_zero_addr(sdata->u.mgd.bssid); 2502 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2503 sdata->u.mgd.flags = 0; 2504 mutex_lock(&sdata->local->mtx); 2505 ieee80211_vif_release_channel(sdata); 2506 mutex_unlock(&sdata->local->mtx); 2507 } 2508 2509 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2510 kfree(auth_data); 2511 sdata->u.mgd.auth_data = NULL; 2512 } 2513 2514 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2515 bool assoc) 2516 { 2517 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2518 2519 sdata_assert_lock(sdata); 2520 2521 if (!assoc) { 2522 /* 2523 * we are not associated yet, the only timer that could be 2524 * running is the timeout for the association response which 2525 * which is not relevant anymore. 2526 */ 2527 del_timer_sync(&sdata->u.mgd.timer); 2528 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2529 2530 eth_zero_addr(sdata->u.mgd.bssid); 2531 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2532 sdata->u.mgd.flags = 0; 2533 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER; 2534 mutex_lock(&sdata->local->mtx); 2535 ieee80211_vif_release_channel(sdata); 2536 mutex_unlock(&sdata->local->mtx); 2537 } 2538 2539 kfree(assoc_data); 2540 sdata->u.mgd.assoc_data = NULL; 2541 } 2542 2543 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2544 struct ieee80211_mgmt *mgmt, size_t len) 2545 { 2546 struct ieee80211_local *local = sdata->local; 2547 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2548 u8 *pos; 2549 struct ieee802_11_elems elems; 2550 u32 tx_flags = 0; 2551 2552 pos = mgmt->u.auth.variable; 2553 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2554 if (!elems.challenge) 2555 return; 2556 auth_data->expected_transaction = 4; 2557 drv_mgd_prepare_tx(sdata->local, sdata); 2558 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2559 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2560 IEEE80211_TX_INTFL_MLME_CONN_TX; 2561 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2562 elems.challenge - 2, elems.challenge_len + 2, 2563 auth_data->bss->bssid, auth_data->bss->bssid, 2564 auth_data->key, auth_data->key_len, 2565 auth_data->key_idx, tx_flags); 2566 } 2567 2568 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2569 struct ieee80211_mgmt *mgmt, size_t len) 2570 { 2571 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2572 u8 bssid[ETH_ALEN]; 2573 u16 auth_alg, auth_transaction, status_code; 2574 struct sta_info *sta; 2575 struct ieee80211_event event = { 2576 .type = MLME_EVENT, 2577 .u.mlme.data = AUTH_EVENT, 2578 }; 2579 2580 sdata_assert_lock(sdata); 2581 2582 if (len < 24 + 6) 2583 return; 2584 2585 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2586 return; 2587 2588 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2589 2590 if (!ether_addr_equal(bssid, mgmt->bssid)) 2591 return; 2592 2593 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2594 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2595 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2596 2597 if (auth_alg != ifmgd->auth_data->algorithm || 2598 auth_transaction != ifmgd->auth_data->expected_transaction) { 2599 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2600 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2601 auth_transaction, 2602 ifmgd->auth_data->expected_transaction); 2603 return; 2604 } 2605 2606 if (status_code != WLAN_STATUS_SUCCESS) { 2607 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2608 mgmt->sa, status_code); 2609 ieee80211_destroy_auth_data(sdata, false); 2610 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2611 event.u.mlme.status = MLME_DENIED; 2612 event.u.mlme.reason = status_code; 2613 drv_event_callback(sdata->local, sdata, &event); 2614 return; 2615 } 2616 2617 switch (ifmgd->auth_data->algorithm) { 2618 case WLAN_AUTH_OPEN: 2619 case WLAN_AUTH_LEAP: 2620 case WLAN_AUTH_FT: 2621 case WLAN_AUTH_SAE: 2622 break; 2623 case WLAN_AUTH_SHARED_KEY: 2624 if (ifmgd->auth_data->expected_transaction != 4) { 2625 ieee80211_auth_challenge(sdata, mgmt, len); 2626 /* need another frame */ 2627 return; 2628 } 2629 break; 2630 default: 2631 WARN_ONCE(1, "invalid auth alg %d", 2632 ifmgd->auth_data->algorithm); 2633 return; 2634 } 2635 2636 event.u.mlme.status = MLME_SUCCESS; 2637 drv_event_callback(sdata->local, sdata, &event); 2638 sdata_info(sdata, "authenticated\n"); 2639 ifmgd->auth_data->done = true; 2640 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2641 ifmgd->auth_data->timeout_started = true; 2642 run_again(sdata, ifmgd->auth_data->timeout); 2643 2644 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2645 ifmgd->auth_data->expected_transaction != 2) { 2646 /* 2647 * Report auth frame to user space for processing since another 2648 * round of Authentication frames is still needed. 2649 */ 2650 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2651 return; 2652 } 2653 2654 /* move station state to auth */ 2655 mutex_lock(&sdata->local->sta_mtx); 2656 sta = sta_info_get(sdata, bssid); 2657 if (!sta) { 2658 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2659 goto out_err; 2660 } 2661 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2662 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2663 goto out_err; 2664 } 2665 mutex_unlock(&sdata->local->sta_mtx); 2666 2667 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2668 return; 2669 out_err: 2670 mutex_unlock(&sdata->local->sta_mtx); 2671 /* ignore frame -- wait for timeout */ 2672 } 2673 2674 #define case_WLAN(type) \ 2675 case WLAN_REASON_##type: return #type 2676 2677 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2678 { 2679 switch (reason_code) { 2680 case_WLAN(UNSPECIFIED); 2681 case_WLAN(PREV_AUTH_NOT_VALID); 2682 case_WLAN(DEAUTH_LEAVING); 2683 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2684 case_WLAN(DISASSOC_AP_BUSY); 2685 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2686 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2687 case_WLAN(DISASSOC_STA_HAS_LEFT); 2688 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2689 case_WLAN(DISASSOC_BAD_POWER); 2690 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2691 case_WLAN(INVALID_IE); 2692 case_WLAN(MIC_FAILURE); 2693 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2694 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2695 case_WLAN(IE_DIFFERENT); 2696 case_WLAN(INVALID_GROUP_CIPHER); 2697 case_WLAN(INVALID_PAIRWISE_CIPHER); 2698 case_WLAN(INVALID_AKMP); 2699 case_WLAN(UNSUPP_RSN_VERSION); 2700 case_WLAN(INVALID_RSN_IE_CAP); 2701 case_WLAN(IEEE8021X_FAILED); 2702 case_WLAN(CIPHER_SUITE_REJECTED); 2703 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2704 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2705 case_WLAN(DISASSOC_LOW_ACK); 2706 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2707 case_WLAN(QSTA_LEAVE_QBSS); 2708 case_WLAN(QSTA_NOT_USE); 2709 case_WLAN(QSTA_REQUIRE_SETUP); 2710 case_WLAN(QSTA_TIMEOUT); 2711 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2712 case_WLAN(MESH_PEER_CANCELED); 2713 case_WLAN(MESH_MAX_PEERS); 2714 case_WLAN(MESH_CONFIG); 2715 case_WLAN(MESH_CLOSE); 2716 case_WLAN(MESH_MAX_RETRIES); 2717 case_WLAN(MESH_CONFIRM_TIMEOUT); 2718 case_WLAN(MESH_INVALID_GTK); 2719 case_WLAN(MESH_INCONSISTENT_PARAM); 2720 case_WLAN(MESH_INVALID_SECURITY); 2721 case_WLAN(MESH_PATH_ERROR); 2722 case_WLAN(MESH_PATH_NOFORWARD); 2723 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2724 case_WLAN(MAC_EXISTS_IN_MBSS); 2725 case_WLAN(MESH_CHAN_REGULATORY); 2726 case_WLAN(MESH_CHAN); 2727 default: return "<unknown>"; 2728 } 2729 } 2730 2731 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2732 struct ieee80211_mgmt *mgmt, size_t len) 2733 { 2734 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2735 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2736 2737 sdata_assert_lock(sdata); 2738 2739 if (len < 24 + 2) 2740 return; 2741 2742 if (ifmgd->associated && 2743 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2744 const u8 *bssid = ifmgd->associated->bssid; 2745 2746 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2747 bssid, reason_code, 2748 ieee80211_get_reason_code_string(reason_code)); 2749 2750 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2751 2752 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2753 reason_code); 2754 return; 2755 } 2756 2757 if (ifmgd->assoc_data && 2758 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2759 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2760 2761 sdata_info(sdata, 2762 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2763 bssid, reason_code, 2764 ieee80211_get_reason_code_string(reason_code)); 2765 2766 ieee80211_destroy_assoc_data(sdata, false); 2767 2768 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2769 return; 2770 } 2771 } 2772 2773 2774 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2775 struct ieee80211_mgmt *mgmt, size_t len) 2776 { 2777 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2778 u16 reason_code; 2779 2780 sdata_assert_lock(sdata); 2781 2782 if (len < 24 + 2) 2783 return; 2784 2785 if (!ifmgd->associated || 2786 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2787 return; 2788 2789 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2790 2791 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2792 mgmt->sa, reason_code); 2793 2794 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2795 2796 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2797 } 2798 2799 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2800 u8 *supp_rates, unsigned int supp_rates_len, 2801 u32 *rates, u32 *basic_rates, 2802 bool *have_higher_than_11mbit, 2803 int *min_rate, int *min_rate_index, 2804 int shift, u32 rate_flags) 2805 { 2806 int i, j; 2807 2808 for (i = 0; i < supp_rates_len; i++) { 2809 int rate = supp_rates[i] & 0x7f; 2810 bool is_basic = !!(supp_rates[i] & 0x80); 2811 2812 if ((rate * 5 * (1 << shift)) > 110) 2813 *have_higher_than_11mbit = true; 2814 2815 /* 2816 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2817 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2818 * 2819 * Note: Even through the membership selector and the basic 2820 * rate flag share the same bit, they are not exactly 2821 * the same. 2822 */ 2823 if (!!(supp_rates[i] & 0x80) && 2824 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2825 continue; 2826 2827 for (j = 0; j < sband->n_bitrates; j++) { 2828 struct ieee80211_rate *br; 2829 int brate; 2830 2831 br = &sband->bitrates[j]; 2832 if ((rate_flags & br->flags) != rate_flags) 2833 continue; 2834 2835 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2836 if (brate == rate) { 2837 *rates |= BIT(j); 2838 if (is_basic) 2839 *basic_rates |= BIT(j); 2840 if ((rate * 5) < *min_rate) { 2841 *min_rate = rate * 5; 2842 *min_rate_index = j; 2843 } 2844 break; 2845 } 2846 } 2847 } 2848 } 2849 2850 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2851 struct cfg80211_bss *cbss, 2852 struct ieee80211_mgmt *mgmt, size_t len) 2853 { 2854 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2855 struct ieee80211_local *local = sdata->local; 2856 struct ieee80211_supported_band *sband; 2857 struct sta_info *sta; 2858 u8 *pos; 2859 u16 capab_info, aid; 2860 struct ieee802_11_elems elems; 2861 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2862 const struct cfg80211_bss_ies *bss_ies = NULL; 2863 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2864 u32 changed = 0; 2865 int err; 2866 bool ret; 2867 2868 /* AssocResp and ReassocResp have identical structure */ 2869 2870 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2871 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2872 2873 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2874 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2875 aid); 2876 aid &= ~(BIT(15) | BIT(14)); 2877 2878 ifmgd->broken_ap = false; 2879 2880 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2881 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2882 aid); 2883 aid = 0; 2884 ifmgd->broken_ap = true; 2885 } 2886 2887 pos = mgmt->u.assoc_resp.variable; 2888 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2889 2890 if (!elems.supp_rates) { 2891 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2892 return false; 2893 } 2894 2895 ifmgd->aid = aid; 2896 ifmgd->tdls_chan_switch_prohibited = 2897 elems.ext_capab && elems.ext_capab_len >= 5 && 2898 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2899 2900 /* 2901 * Some APs are erroneously not including some information in their 2902 * (re)association response frames. Try to recover by using the data 2903 * from the beacon or probe response. This seems to afflict mobile 2904 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2905 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2906 */ 2907 if ((assoc_data->wmm && !elems.wmm_param) || 2908 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2909 (!elems.ht_cap_elem || !elems.ht_operation)) || 2910 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2911 (!elems.vht_cap_elem || !elems.vht_operation))) { 2912 const struct cfg80211_bss_ies *ies; 2913 struct ieee802_11_elems bss_elems; 2914 2915 rcu_read_lock(); 2916 ies = rcu_dereference(cbss->ies); 2917 if (ies) 2918 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2919 GFP_ATOMIC); 2920 rcu_read_unlock(); 2921 if (!bss_ies) 2922 return false; 2923 2924 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2925 false, &bss_elems); 2926 if (assoc_data->wmm && 2927 !elems.wmm_param && bss_elems.wmm_param) { 2928 elems.wmm_param = bss_elems.wmm_param; 2929 sdata_info(sdata, 2930 "AP bug: WMM param missing from AssocResp\n"); 2931 } 2932 2933 /* 2934 * Also check if we requested HT/VHT, otherwise the AP doesn't 2935 * have to include the IEs in the (re)association response. 2936 */ 2937 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2938 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2939 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2940 sdata_info(sdata, 2941 "AP bug: HT capability missing from AssocResp\n"); 2942 } 2943 if (!elems.ht_operation && bss_elems.ht_operation && 2944 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2945 elems.ht_operation = bss_elems.ht_operation; 2946 sdata_info(sdata, 2947 "AP bug: HT operation missing from AssocResp\n"); 2948 } 2949 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2950 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2951 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2952 sdata_info(sdata, 2953 "AP bug: VHT capa missing from AssocResp\n"); 2954 } 2955 if (!elems.vht_operation && bss_elems.vht_operation && 2956 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2957 elems.vht_operation = bss_elems.vht_operation; 2958 sdata_info(sdata, 2959 "AP bug: VHT operation missing from AssocResp\n"); 2960 } 2961 } 2962 2963 /* 2964 * We previously checked these in the beacon/probe response, so 2965 * they should be present here. This is just a safety net. 2966 */ 2967 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2968 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2969 sdata_info(sdata, 2970 "HT AP is missing WMM params or HT capability/operation\n"); 2971 ret = false; 2972 goto out; 2973 } 2974 2975 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2976 (!elems.vht_cap_elem || !elems.vht_operation)) { 2977 sdata_info(sdata, 2978 "VHT AP is missing VHT capability/operation\n"); 2979 ret = false; 2980 goto out; 2981 } 2982 2983 mutex_lock(&sdata->local->sta_mtx); 2984 /* 2985 * station info was already allocated and inserted before 2986 * the association and should be available to us 2987 */ 2988 sta = sta_info_get(sdata, cbss->bssid); 2989 if (WARN_ON(!sta)) { 2990 mutex_unlock(&sdata->local->sta_mtx); 2991 ret = false; 2992 goto out; 2993 } 2994 2995 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2996 2997 /* Set up internal HT/VHT capabilities */ 2998 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2999 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 3000 elems.ht_cap_elem, sta); 3001 3002 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 3003 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 3004 elems.vht_cap_elem, sta); 3005 3006 /* 3007 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3008 * in their association response, so ignore that data for our own 3009 * configuration. If it changed since the last beacon, we'll get the 3010 * next beacon and update then. 3011 */ 3012 3013 /* 3014 * If an operating mode notification IE is present, override the 3015 * NSS calculation (that would be done in rate_control_rate_init()) 3016 * and use the # of streams from that element. 3017 */ 3018 if (elems.opmode_notif && 3019 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3020 u8 nss; 3021 3022 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3023 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3024 nss += 1; 3025 sta->sta.rx_nss = nss; 3026 } 3027 3028 rate_control_rate_init(sta); 3029 3030 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3031 set_sta_flag(sta, WLAN_STA_MFP); 3032 sta->sta.mfp = true; 3033 } else { 3034 sta->sta.mfp = false; 3035 } 3036 3037 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3038 3039 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3040 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3041 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3042 if (err) { 3043 sdata_info(sdata, 3044 "failed to move station %pM to desired state\n", 3045 sta->sta.addr); 3046 WARN_ON(__sta_info_destroy(sta)); 3047 mutex_unlock(&sdata->local->sta_mtx); 3048 ret = false; 3049 goto out; 3050 } 3051 3052 mutex_unlock(&sdata->local->sta_mtx); 3053 3054 /* 3055 * Always handle WMM once after association regardless 3056 * of the first value the AP uses. Setting -1 here has 3057 * that effect because the AP values is an unsigned 3058 * 4-bit value. 3059 */ 3060 ifmgd->wmm_last_param_set = -1; 3061 3062 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3063 ieee80211_set_wmm_default(sdata, false, false); 3064 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3065 elems.wmm_param_len)) { 3066 /* still enable QoS since we might have HT/VHT */ 3067 ieee80211_set_wmm_default(sdata, false, true); 3068 /* set the disable-WMM flag in this case to disable 3069 * tracking WMM parameter changes in the beacon if 3070 * the parameters weren't actually valid. Doing so 3071 * avoids changing parameters very strangely when 3072 * the AP is going back and forth between valid and 3073 * invalid parameters. 3074 */ 3075 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3076 } 3077 changed |= BSS_CHANGED_QOS; 3078 3079 /* set AID and assoc capability, 3080 * ieee80211_set_associated() will tell the driver */ 3081 bss_conf->aid = aid; 3082 bss_conf->assoc_capability = capab_info; 3083 ieee80211_set_associated(sdata, cbss, changed); 3084 3085 /* 3086 * If we're using 4-addr mode, let the AP know that we're 3087 * doing so, so that it can create the STA VLAN on its side 3088 */ 3089 if (ifmgd->use_4addr) 3090 ieee80211_send_4addr_nullfunc(local, sdata); 3091 3092 /* 3093 * Start timer to probe the connection to the AP now. 3094 * Also start the timer that will detect beacon loss. 3095 */ 3096 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3097 ieee80211_sta_reset_beacon_monitor(sdata); 3098 3099 ret = true; 3100 out: 3101 kfree(bss_ies); 3102 return ret; 3103 } 3104 3105 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3106 struct ieee80211_mgmt *mgmt, 3107 size_t len) 3108 { 3109 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3110 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3111 u16 capab_info, status_code, aid; 3112 struct ieee802_11_elems elems; 3113 int ac, uapsd_queues = -1; 3114 u8 *pos; 3115 bool reassoc; 3116 struct cfg80211_bss *bss; 3117 struct ieee80211_event event = { 3118 .type = MLME_EVENT, 3119 .u.mlme.data = ASSOC_EVENT, 3120 }; 3121 3122 sdata_assert_lock(sdata); 3123 3124 if (!assoc_data) 3125 return; 3126 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3127 return; 3128 3129 /* 3130 * AssocResp and ReassocResp have identical structure, so process both 3131 * of them in this function. 3132 */ 3133 3134 if (len < 24 + 6) 3135 return; 3136 3137 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3138 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3139 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3140 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3141 3142 sdata_info(sdata, 3143 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3144 reassoc ? "Rea" : "A", mgmt->sa, 3145 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3146 3147 pos = mgmt->u.assoc_resp.variable; 3148 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3149 3150 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3151 elems.timeout_int && 3152 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3153 u32 tu, ms; 3154 tu = le32_to_cpu(elems.timeout_int->value); 3155 ms = tu * 1024 / 1000; 3156 sdata_info(sdata, 3157 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3158 mgmt->sa, tu, ms); 3159 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3160 assoc_data->timeout_started = true; 3161 if (ms > IEEE80211_ASSOC_TIMEOUT) 3162 run_again(sdata, assoc_data->timeout); 3163 return; 3164 } 3165 3166 bss = assoc_data->bss; 3167 3168 if (status_code != WLAN_STATUS_SUCCESS) { 3169 sdata_info(sdata, "%pM denied association (code=%d)\n", 3170 mgmt->sa, status_code); 3171 ieee80211_destroy_assoc_data(sdata, false); 3172 event.u.mlme.status = MLME_DENIED; 3173 event.u.mlme.reason = status_code; 3174 drv_event_callback(sdata->local, sdata, &event); 3175 } else { 3176 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3177 /* oops -- internal error -- send timeout for now */ 3178 ieee80211_destroy_assoc_data(sdata, false); 3179 cfg80211_assoc_timeout(sdata->dev, bss); 3180 return; 3181 } 3182 event.u.mlme.status = MLME_SUCCESS; 3183 drv_event_callback(sdata->local, sdata, &event); 3184 sdata_info(sdata, "associated\n"); 3185 3186 /* 3187 * destroy assoc_data afterwards, as otherwise an idle 3188 * recalc after assoc_data is NULL but before associated 3189 * is set can cause the interface to go idle 3190 */ 3191 ieee80211_destroy_assoc_data(sdata, true); 3192 3193 /* get uapsd queues configuration */ 3194 uapsd_queues = 0; 3195 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3196 if (sdata->tx_conf[ac].uapsd) 3197 uapsd_queues |= BIT(ac); 3198 } 3199 3200 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3201 } 3202 3203 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3204 struct ieee80211_mgmt *mgmt, size_t len, 3205 struct ieee80211_rx_status *rx_status, 3206 struct ieee802_11_elems *elems) 3207 { 3208 struct ieee80211_local *local = sdata->local; 3209 struct ieee80211_bss *bss; 3210 struct ieee80211_channel *channel; 3211 3212 sdata_assert_lock(sdata); 3213 3214 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3215 if (!channel) 3216 return; 3217 3218 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3219 channel); 3220 if (bss) { 3221 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3222 ieee80211_rx_bss_put(local, bss); 3223 } 3224 } 3225 3226 3227 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3228 struct sk_buff *skb) 3229 { 3230 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3231 struct ieee80211_if_managed *ifmgd; 3232 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3233 size_t baselen, len = skb->len; 3234 struct ieee802_11_elems elems; 3235 3236 ifmgd = &sdata->u.mgd; 3237 3238 sdata_assert_lock(sdata); 3239 3240 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3241 return; /* ignore ProbeResp to foreign address */ 3242 3243 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3244 if (baselen > len) 3245 return; 3246 3247 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3248 false, &elems); 3249 3250 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3251 3252 if (ifmgd->associated && 3253 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3254 ieee80211_reset_ap_probe(sdata); 3255 } 3256 3257 /* 3258 * This is the canonical list of information elements we care about, 3259 * the filter code also gives us all changes to the Microsoft OUI 3260 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3261 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3262 * changes to requested client power. 3263 * 3264 * We implement beacon filtering in software since that means we can 3265 * avoid processing the frame here and in cfg80211, and userspace 3266 * will not be able to tell whether the hardware supports it or not. 3267 * 3268 * XXX: This list needs to be dynamic -- userspace needs to be able to 3269 * add items it requires. It also needs to be able to tell us to 3270 * look out for other vendor IEs. 3271 */ 3272 static const u64 care_about_ies = 3273 (1ULL << WLAN_EID_COUNTRY) | 3274 (1ULL << WLAN_EID_ERP_INFO) | 3275 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3276 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3277 (1ULL << WLAN_EID_HT_CAPABILITY) | 3278 (1ULL << WLAN_EID_HT_OPERATION) | 3279 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3280 3281 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3282 struct ieee80211_mgmt *mgmt, size_t len, 3283 struct ieee80211_rx_status *rx_status) 3284 { 3285 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3286 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3287 size_t baselen; 3288 struct ieee802_11_elems elems; 3289 struct ieee80211_local *local = sdata->local; 3290 struct ieee80211_chanctx_conf *chanctx_conf; 3291 struct ieee80211_channel *chan; 3292 struct sta_info *sta; 3293 u32 changed = 0; 3294 bool erp_valid; 3295 u8 erp_value = 0; 3296 u32 ncrc; 3297 u8 *bssid; 3298 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3299 3300 sdata_assert_lock(sdata); 3301 3302 /* Process beacon from the current BSS */ 3303 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3304 if (baselen > len) 3305 return; 3306 3307 rcu_read_lock(); 3308 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3309 if (!chanctx_conf) { 3310 rcu_read_unlock(); 3311 return; 3312 } 3313 3314 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3315 rcu_read_unlock(); 3316 return; 3317 } 3318 chan = chanctx_conf->def.chan; 3319 rcu_read_unlock(); 3320 3321 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3322 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3323 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3324 len - baselen, false, &elems); 3325 3326 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3327 if (elems.tim && !elems.parse_error) { 3328 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3329 ifmgd->dtim_period = tim_ie->dtim_period; 3330 } 3331 ifmgd->have_beacon = true; 3332 ifmgd->assoc_data->need_beacon = false; 3333 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3334 sdata->vif.bss_conf.sync_tsf = 3335 le64_to_cpu(mgmt->u.beacon.timestamp); 3336 sdata->vif.bss_conf.sync_device_ts = 3337 rx_status->device_timestamp; 3338 if (elems.tim) 3339 sdata->vif.bss_conf.sync_dtim_count = 3340 elems.tim->dtim_count; 3341 else 3342 sdata->vif.bss_conf.sync_dtim_count = 0; 3343 } 3344 /* continue assoc process */ 3345 ifmgd->assoc_data->timeout = jiffies; 3346 ifmgd->assoc_data->timeout_started = true; 3347 run_again(sdata, ifmgd->assoc_data->timeout); 3348 return; 3349 } 3350 3351 if (!ifmgd->associated || 3352 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3353 return; 3354 bssid = ifmgd->associated->bssid; 3355 3356 /* Track average RSSI from the Beacon frames of the current AP */ 3357 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3358 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3359 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3360 ifmgd->last_cqm_event_signal = 0; 3361 ifmgd->count_beacon_signal = 1; 3362 ifmgd->last_ave_beacon_signal = 0; 3363 } else { 3364 ifmgd->count_beacon_signal++; 3365 } 3366 3367 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3368 3369 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3370 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3371 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3372 int last_sig = ifmgd->last_ave_beacon_signal; 3373 struct ieee80211_event event = { 3374 .type = RSSI_EVENT, 3375 }; 3376 3377 /* 3378 * if signal crosses either of the boundaries, invoke callback 3379 * with appropriate parameters 3380 */ 3381 if (sig > ifmgd->rssi_max_thold && 3382 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3383 ifmgd->last_ave_beacon_signal = sig; 3384 event.u.rssi.data = RSSI_EVENT_HIGH; 3385 drv_event_callback(local, sdata, &event); 3386 } else if (sig < ifmgd->rssi_min_thold && 3387 (last_sig >= ifmgd->rssi_max_thold || 3388 last_sig == 0)) { 3389 ifmgd->last_ave_beacon_signal = sig; 3390 event.u.rssi.data = RSSI_EVENT_LOW; 3391 drv_event_callback(local, sdata, &event); 3392 } 3393 } 3394 3395 if (bss_conf->cqm_rssi_thold && 3396 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3397 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3398 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3399 int last_event = ifmgd->last_cqm_event_signal; 3400 int thold = bss_conf->cqm_rssi_thold; 3401 int hyst = bss_conf->cqm_rssi_hyst; 3402 3403 if (sig < thold && 3404 (last_event == 0 || sig < last_event - hyst)) { 3405 ifmgd->last_cqm_event_signal = sig; 3406 ieee80211_cqm_rssi_notify( 3407 &sdata->vif, 3408 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3409 GFP_KERNEL); 3410 } else if (sig > thold && 3411 (last_event == 0 || sig > last_event + hyst)) { 3412 ifmgd->last_cqm_event_signal = sig; 3413 ieee80211_cqm_rssi_notify( 3414 &sdata->vif, 3415 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3416 GFP_KERNEL); 3417 } 3418 } 3419 3420 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3421 mlme_dbg_ratelimited(sdata, 3422 "cancelling AP probe due to a received beacon\n"); 3423 ieee80211_reset_ap_probe(sdata); 3424 } 3425 3426 /* 3427 * Push the beacon loss detection into the future since 3428 * we are processing a beacon from the AP just now. 3429 */ 3430 ieee80211_sta_reset_beacon_monitor(sdata); 3431 3432 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3433 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3434 len - baselen, false, &elems, 3435 care_about_ies, ncrc); 3436 3437 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3438 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3439 if (local->hw.conf.dynamic_ps_timeout > 0) { 3440 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3441 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3442 ieee80211_hw_config(local, 3443 IEEE80211_CONF_CHANGE_PS); 3444 } 3445 ieee80211_send_nullfunc(local, sdata, false); 3446 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3447 local->pspolling = true; 3448 3449 /* 3450 * Here is assumed that the driver will be 3451 * able to send ps-poll frame and receive a 3452 * response even though power save mode is 3453 * enabled, but some drivers might require 3454 * to disable power save here. This needs 3455 * to be investigated. 3456 */ 3457 ieee80211_send_pspoll(local, sdata); 3458 } 3459 } 3460 3461 if (sdata->vif.p2p) { 3462 struct ieee80211_p2p_noa_attr noa = {}; 3463 int ret; 3464 3465 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3466 len - baselen, 3467 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3468 (u8 *) &noa, sizeof(noa)); 3469 if (ret >= 2) { 3470 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3471 /* valid noa_attr and index changed */ 3472 sdata->u.mgd.p2p_noa_index = noa.index; 3473 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3474 changed |= BSS_CHANGED_P2P_PS; 3475 /* 3476 * make sure we update all information, the CRC 3477 * mechanism doesn't look at P2P attributes. 3478 */ 3479 ifmgd->beacon_crc_valid = false; 3480 } 3481 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3482 /* noa_attr not found and we had valid noa_attr before */ 3483 sdata->u.mgd.p2p_noa_index = -1; 3484 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3485 changed |= BSS_CHANGED_P2P_PS; 3486 ifmgd->beacon_crc_valid = false; 3487 } 3488 } 3489 3490 if (ifmgd->csa_waiting_bcn) 3491 ieee80211_chswitch_post_beacon(sdata); 3492 3493 /* 3494 * Update beacon timing and dtim count on every beacon appearance. This 3495 * will allow the driver to use the most updated values. Do it before 3496 * comparing this one with last received beacon. 3497 * IMPORTANT: These parameters would possibly be out of sync by the time 3498 * the driver will use them. The synchronized view is currently 3499 * guaranteed only in certain callbacks. 3500 */ 3501 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3502 sdata->vif.bss_conf.sync_tsf = 3503 le64_to_cpu(mgmt->u.beacon.timestamp); 3504 sdata->vif.bss_conf.sync_device_ts = 3505 rx_status->device_timestamp; 3506 if (elems.tim) 3507 sdata->vif.bss_conf.sync_dtim_count = 3508 elems.tim->dtim_count; 3509 else 3510 sdata->vif.bss_conf.sync_dtim_count = 0; 3511 } 3512 3513 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3514 return; 3515 ifmgd->beacon_crc = ncrc; 3516 ifmgd->beacon_crc_valid = true; 3517 3518 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3519 3520 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3521 rx_status->device_timestamp, 3522 &elems, true); 3523 3524 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3525 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3526 elems.wmm_param_len)) 3527 changed |= BSS_CHANGED_QOS; 3528 3529 /* 3530 * If we haven't had a beacon before, tell the driver about the 3531 * DTIM period (and beacon timing if desired) now. 3532 */ 3533 if (!ifmgd->have_beacon) { 3534 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3535 if (elems.tim) 3536 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3537 else 3538 bss_conf->dtim_period = 1; 3539 3540 changed |= BSS_CHANGED_BEACON_INFO; 3541 ifmgd->have_beacon = true; 3542 3543 mutex_lock(&local->iflist_mtx); 3544 ieee80211_recalc_ps(local); 3545 mutex_unlock(&local->iflist_mtx); 3546 3547 ieee80211_recalc_ps_vif(sdata); 3548 } 3549 3550 if (elems.erp_info) { 3551 erp_valid = true; 3552 erp_value = elems.erp_info[0]; 3553 } else { 3554 erp_valid = false; 3555 } 3556 changed |= ieee80211_handle_bss_capability(sdata, 3557 le16_to_cpu(mgmt->u.beacon.capab_info), 3558 erp_valid, erp_value); 3559 3560 mutex_lock(&local->sta_mtx); 3561 sta = sta_info_get(sdata, bssid); 3562 3563 if (ieee80211_config_bw(sdata, sta, 3564 elems.ht_cap_elem, elems.ht_operation, 3565 elems.vht_operation, bssid, &changed)) { 3566 mutex_unlock(&local->sta_mtx); 3567 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3568 WLAN_REASON_DEAUTH_LEAVING, 3569 true, deauth_buf); 3570 ieee80211_report_disconnect(sdata, deauth_buf, 3571 sizeof(deauth_buf), true, 3572 WLAN_REASON_DEAUTH_LEAVING); 3573 return; 3574 } 3575 3576 if (sta && elems.opmode_notif) 3577 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3578 rx_status->band, true); 3579 mutex_unlock(&local->sta_mtx); 3580 3581 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3582 elems.country_elem, 3583 elems.country_elem_len, 3584 elems.pwr_constr_elem, 3585 elems.cisco_dtpc_elem); 3586 3587 ieee80211_bss_info_change_notify(sdata, changed); 3588 } 3589 3590 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3591 struct sk_buff *skb) 3592 { 3593 struct ieee80211_rx_status *rx_status; 3594 struct ieee80211_mgmt *mgmt; 3595 u16 fc; 3596 struct ieee802_11_elems elems; 3597 int ies_len; 3598 3599 rx_status = (struct ieee80211_rx_status *) skb->cb; 3600 mgmt = (struct ieee80211_mgmt *) skb->data; 3601 fc = le16_to_cpu(mgmt->frame_control); 3602 3603 sdata_lock(sdata); 3604 3605 switch (fc & IEEE80211_FCTL_STYPE) { 3606 case IEEE80211_STYPE_BEACON: 3607 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3608 break; 3609 case IEEE80211_STYPE_PROBE_RESP: 3610 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3611 break; 3612 case IEEE80211_STYPE_AUTH: 3613 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3614 break; 3615 case IEEE80211_STYPE_DEAUTH: 3616 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3617 break; 3618 case IEEE80211_STYPE_DISASSOC: 3619 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3620 break; 3621 case IEEE80211_STYPE_ASSOC_RESP: 3622 case IEEE80211_STYPE_REASSOC_RESP: 3623 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3624 break; 3625 case IEEE80211_STYPE_ACTION: 3626 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3627 ies_len = skb->len - 3628 offsetof(struct ieee80211_mgmt, 3629 u.action.u.chan_switch.variable); 3630 3631 if (ies_len < 0) 3632 break; 3633 3634 ieee802_11_parse_elems( 3635 mgmt->u.action.u.chan_switch.variable, 3636 ies_len, true, &elems); 3637 3638 if (elems.parse_error) 3639 break; 3640 3641 ieee80211_sta_process_chanswitch(sdata, 3642 rx_status->mactime, 3643 rx_status->device_timestamp, 3644 &elems, false); 3645 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3646 ies_len = skb->len - 3647 offsetof(struct ieee80211_mgmt, 3648 u.action.u.ext_chan_switch.variable); 3649 3650 if (ies_len < 0) 3651 break; 3652 3653 ieee802_11_parse_elems( 3654 mgmt->u.action.u.ext_chan_switch.variable, 3655 ies_len, true, &elems); 3656 3657 if (elems.parse_error) 3658 break; 3659 3660 /* for the handling code pretend this was also an IE */ 3661 elems.ext_chansw_ie = 3662 &mgmt->u.action.u.ext_chan_switch.data; 3663 3664 ieee80211_sta_process_chanswitch(sdata, 3665 rx_status->mactime, 3666 rx_status->device_timestamp, 3667 &elems, false); 3668 } 3669 break; 3670 } 3671 sdata_unlock(sdata); 3672 } 3673 3674 static void ieee80211_sta_timer(unsigned long data) 3675 { 3676 struct ieee80211_sub_if_data *sdata = 3677 (struct ieee80211_sub_if_data *) data; 3678 3679 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3680 } 3681 3682 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3683 u8 *bssid, u8 reason, bool tx) 3684 { 3685 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3686 3687 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3688 tx, frame_buf); 3689 3690 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3691 reason); 3692 } 3693 3694 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3695 { 3696 struct ieee80211_local *local = sdata->local; 3697 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3698 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3699 u32 tx_flags = 0; 3700 u16 trans = 1; 3701 u16 status = 0; 3702 3703 sdata_assert_lock(sdata); 3704 3705 if (WARN_ON_ONCE(!auth_data)) 3706 return -EINVAL; 3707 3708 auth_data->tries++; 3709 3710 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3711 sdata_info(sdata, "authentication with %pM timed out\n", 3712 auth_data->bss->bssid); 3713 3714 /* 3715 * Most likely AP is not in the range so remove the 3716 * bss struct for that AP. 3717 */ 3718 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3719 3720 return -ETIMEDOUT; 3721 } 3722 3723 drv_mgd_prepare_tx(local, sdata); 3724 3725 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3726 auth_data->bss->bssid, auth_data->tries, 3727 IEEE80211_AUTH_MAX_TRIES); 3728 3729 auth_data->expected_transaction = 2; 3730 3731 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3732 trans = auth_data->sae_trans; 3733 status = auth_data->sae_status; 3734 auth_data->expected_transaction = trans; 3735 } 3736 3737 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3738 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3739 IEEE80211_TX_INTFL_MLME_CONN_TX; 3740 3741 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3742 auth_data->data, auth_data->data_len, 3743 auth_data->bss->bssid, 3744 auth_data->bss->bssid, NULL, 0, 0, 3745 tx_flags); 3746 3747 if (tx_flags == 0) { 3748 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3749 auth_data->timeout_started = true; 3750 run_again(sdata, auth_data->timeout); 3751 } else { 3752 auth_data->timeout = 3753 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3754 auth_data->timeout_started = true; 3755 run_again(sdata, auth_data->timeout); 3756 } 3757 3758 return 0; 3759 } 3760 3761 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3762 { 3763 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3764 struct ieee80211_local *local = sdata->local; 3765 3766 sdata_assert_lock(sdata); 3767 3768 assoc_data->tries++; 3769 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3770 sdata_info(sdata, "association with %pM timed out\n", 3771 assoc_data->bss->bssid); 3772 3773 /* 3774 * Most likely AP is not in the range so remove the 3775 * bss struct for that AP. 3776 */ 3777 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3778 3779 return -ETIMEDOUT; 3780 } 3781 3782 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3783 assoc_data->bss->bssid, assoc_data->tries, 3784 IEEE80211_ASSOC_MAX_TRIES); 3785 ieee80211_send_assoc(sdata); 3786 3787 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3788 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3789 assoc_data->timeout_started = true; 3790 run_again(sdata, assoc_data->timeout); 3791 } else { 3792 assoc_data->timeout = 3793 round_jiffies_up(jiffies + 3794 IEEE80211_ASSOC_TIMEOUT_LONG); 3795 assoc_data->timeout_started = true; 3796 run_again(sdata, assoc_data->timeout); 3797 } 3798 3799 return 0; 3800 } 3801 3802 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3803 __le16 fc, bool acked) 3804 { 3805 struct ieee80211_local *local = sdata->local; 3806 3807 sdata->u.mgd.status_fc = fc; 3808 sdata->u.mgd.status_acked = acked; 3809 sdata->u.mgd.status_received = true; 3810 3811 ieee80211_queue_work(&local->hw, &sdata->work); 3812 } 3813 3814 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3815 { 3816 struct ieee80211_local *local = sdata->local; 3817 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3818 3819 sdata_lock(sdata); 3820 3821 if (ifmgd->status_received) { 3822 __le16 fc = ifmgd->status_fc; 3823 bool status_acked = ifmgd->status_acked; 3824 3825 ifmgd->status_received = false; 3826 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3827 if (status_acked) { 3828 ifmgd->auth_data->timeout = 3829 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3830 run_again(sdata, ifmgd->auth_data->timeout); 3831 } else { 3832 ifmgd->auth_data->timeout = jiffies - 1; 3833 } 3834 ifmgd->auth_data->timeout_started = true; 3835 } else if (ifmgd->assoc_data && 3836 (ieee80211_is_assoc_req(fc) || 3837 ieee80211_is_reassoc_req(fc))) { 3838 if (status_acked) { 3839 ifmgd->assoc_data->timeout = 3840 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3841 run_again(sdata, ifmgd->assoc_data->timeout); 3842 } else { 3843 ifmgd->assoc_data->timeout = jiffies - 1; 3844 } 3845 ifmgd->assoc_data->timeout_started = true; 3846 } 3847 } 3848 3849 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3850 time_after(jiffies, ifmgd->auth_data->timeout)) { 3851 if (ifmgd->auth_data->done) { 3852 /* 3853 * ok ... we waited for assoc but userspace didn't, 3854 * so let's just kill the auth data 3855 */ 3856 ieee80211_destroy_auth_data(sdata, false); 3857 } else if (ieee80211_auth(sdata)) { 3858 u8 bssid[ETH_ALEN]; 3859 struct ieee80211_event event = { 3860 .type = MLME_EVENT, 3861 .u.mlme.data = AUTH_EVENT, 3862 .u.mlme.status = MLME_TIMEOUT, 3863 }; 3864 3865 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3866 3867 ieee80211_destroy_auth_data(sdata, false); 3868 3869 cfg80211_auth_timeout(sdata->dev, bssid); 3870 drv_event_callback(sdata->local, sdata, &event); 3871 } 3872 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3873 run_again(sdata, ifmgd->auth_data->timeout); 3874 3875 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3876 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3877 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3878 ieee80211_do_assoc(sdata)) { 3879 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3880 struct ieee80211_event event = { 3881 .type = MLME_EVENT, 3882 .u.mlme.data = ASSOC_EVENT, 3883 .u.mlme.status = MLME_TIMEOUT, 3884 }; 3885 3886 ieee80211_destroy_assoc_data(sdata, false); 3887 cfg80211_assoc_timeout(sdata->dev, bss); 3888 drv_event_callback(sdata->local, sdata, &event); 3889 } 3890 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3891 run_again(sdata, ifmgd->assoc_data->timeout); 3892 3893 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3894 ifmgd->associated) { 3895 u8 bssid[ETH_ALEN]; 3896 int max_tries; 3897 3898 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3899 3900 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3901 max_tries = max_nullfunc_tries; 3902 else 3903 max_tries = max_probe_tries; 3904 3905 /* ACK received for nullfunc probing frame */ 3906 if (!ifmgd->probe_send_count) 3907 ieee80211_reset_ap_probe(sdata); 3908 else if (ifmgd->nullfunc_failed) { 3909 if (ifmgd->probe_send_count < max_tries) { 3910 mlme_dbg(sdata, 3911 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3912 bssid, ifmgd->probe_send_count, 3913 max_tries); 3914 ieee80211_mgd_probe_ap_send(sdata); 3915 } else { 3916 mlme_dbg(sdata, 3917 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3918 bssid); 3919 ieee80211_sta_connection_lost(sdata, bssid, 3920 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3921 false); 3922 } 3923 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3924 run_again(sdata, ifmgd->probe_timeout); 3925 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3926 mlme_dbg(sdata, 3927 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3928 bssid, probe_wait_ms); 3929 ieee80211_sta_connection_lost(sdata, bssid, 3930 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3931 } else if (ifmgd->probe_send_count < max_tries) { 3932 mlme_dbg(sdata, 3933 "No probe response from AP %pM after %dms, try %d/%i\n", 3934 bssid, probe_wait_ms, 3935 ifmgd->probe_send_count, max_tries); 3936 ieee80211_mgd_probe_ap_send(sdata); 3937 } else { 3938 /* 3939 * We actually lost the connection ... or did we? 3940 * Let's make sure! 3941 */ 3942 wiphy_debug(local->hw.wiphy, 3943 "%s: No probe response from AP %pM" 3944 " after %dms, disconnecting.\n", 3945 sdata->name, 3946 bssid, probe_wait_ms); 3947 3948 ieee80211_sta_connection_lost(sdata, bssid, 3949 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3950 } 3951 } 3952 3953 sdata_unlock(sdata); 3954 } 3955 3956 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3957 { 3958 struct ieee80211_sub_if_data *sdata = 3959 (struct ieee80211_sub_if_data *) data; 3960 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3961 3962 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3963 return; 3964 3965 sdata->u.mgd.connection_loss = false; 3966 ieee80211_queue_work(&sdata->local->hw, 3967 &sdata->u.mgd.beacon_connection_loss_work); 3968 } 3969 3970 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3971 { 3972 struct ieee80211_sub_if_data *sdata = 3973 (struct ieee80211_sub_if_data *) data; 3974 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3975 struct ieee80211_local *local = sdata->local; 3976 3977 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3978 return; 3979 3980 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3981 } 3982 3983 static void ieee80211_sta_monitor_work(struct work_struct *work) 3984 { 3985 struct ieee80211_sub_if_data *sdata = 3986 container_of(work, struct ieee80211_sub_if_data, 3987 u.mgd.monitor_work); 3988 3989 ieee80211_mgd_probe_ap(sdata, false); 3990 } 3991 3992 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3993 { 3994 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3995 __ieee80211_stop_poll(sdata); 3996 3997 /* let's probe the connection once */ 3998 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 3999 ieee80211_queue_work(&sdata->local->hw, 4000 &sdata->u.mgd.monitor_work); 4001 /* and do all the other regular work too */ 4002 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 4003 } 4004 } 4005 4006 #ifdef CONFIG_PM 4007 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4008 { 4009 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4010 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4011 4012 sdata_lock(sdata); 4013 4014 if (ifmgd->auth_data || ifmgd->assoc_data) { 4015 const u8 *bssid = ifmgd->auth_data ? 4016 ifmgd->auth_data->bss->bssid : 4017 ifmgd->assoc_data->bss->bssid; 4018 4019 /* 4020 * If we are trying to authenticate / associate while suspending, 4021 * cfg80211 won't know and won't actually abort those attempts, 4022 * thus we need to do that ourselves. 4023 */ 4024 ieee80211_send_deauth_disassoc(sdata, bssid, 4025 IEEE80211_STYPE_DEAUTH, 4026 WLAN_REASON_DEAUTH_LEAVING, 4027 false, frame_buf); 4028 if (ifmgd->assoc_data) 4029 ieee80211_destroy_assoc_data(sdata, false); 4030 if (ifmgd->auth_data) 4031 ieee80211_destroy_auth_data(sdata, false); 4032 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4033 IEEE80211_DEAUTH_FRAME_LEN); 4034 } 4035 4036 /* This is a bit of a hack - we should find a better and more generic 4037 * solution to this. Normally when suspending, cfg80211 will in fact 4038 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4039 * auth (not so important) or assoc (this is the problem) process. 4040 * 4041 * As a consequence, it can happen that we are in the process of both 4042 * associating and suspending, and receive an association response 4043 * after cfg80211 has checked if it needs to disconnect, but before 4044 * we actually set the flag to drop incoming frames. This will then 4045 * cause the workqueue flush to process the association response in 4046 * the suspend, resulting in a successful association just before it 4047 * tries to remove the interface from the driver, which now though 4048 * has a channel context assigned ... this results in issues. 4049 * 4050 * To work around this (for now) simply deauth here again if we're 4051 * now connected. 4052 */ 4053 if (ifmgd->associated && !sdata->local->wowlan) { 4054 u8 bssid[ETH_ALEN]; 4055 struct cfg80211_deauth_request req = { 4056 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4057 .bssid = bssid, 4058 }; 4059 4060 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4061 ieee80211_mgd_deauth(sdata, &req); 4062 } 4063 4064 sdata_unlock(sdata); 4065 } 4066 4067 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4068 { 4069 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4070 4071 sdata_lock(sdata); 4072 if (!ifmgd->associated) { 4073 sdata_unlock(sdata); 4074 return; 4075 } 4076 4077 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4078 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4079 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4080 ieee80211_sta_connection_lost(sdata, 4081 ifmgd->associated->bssid, 4082 WLAN_REASON_UNSPECIFIED, 4083 true); 4084 sdata_unlock(sdata); 4085 return; 4086 } 4087 sdata_unlock(sdata); 4088 } 4089 #endif 4090 4091 /* interface setup */ 4092 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4093 { 4094 struct ieee80211_if_managed *ifmgd; 4095 4096 ifmgd = &sdata->u.mgd; 4097 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4098 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4099 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4100 ieee80211_beacon_connection_loss_work); 4101 INIT_WORK(&ifmgd->csa_connection_drop_work, 4102 ieee80211_csa_connection_drop_work); 4103 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4104 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4105 ieee80211_tdls_peer_del_work); 4106 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4107 (unsigned long) sdata); 4108 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4109 (unsigned long) sdata); 4110 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4111 (unsigned long) sdata); 4112 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4113 (unsigned long) sdata); 4114 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4115 ieee80211_sta_handle_tspec_ac_params_wk); 4116 4117 ifmgd->flags = 0; 4118 ifmgd->powersave = sdata->wdev.ps; 4119 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4120 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4121 ifmgd->p2p_noa_index = -1; 4122 4123 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4124 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4125 else 4126 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4127 4128 /* Setup TDLS data */ 4129 spin_lock_init(&ifmgd->teardown_lock); 4130 ifmgd->teardown_skb = NULL; 4131 ifmgd->orig_teardown_skb = NULL; 4132 } 4133 4134 /* scan finished notification */ 4135 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4136 { 4137 struct ieee80211_sub_if_data *sdata; 4138 4139 /* Restart STA timers */ 4140 rcu_read_lock(); 4141 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4142 if (ieee80211_sdata_running(sdata)) 4143 ieee80211_restart_sta_timer(sdata); 4144 } 4145 rcu_read_unlock(); 4146 } 4147 4148 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4149 struct cfg80211_bss *cbss) 4150 { 4151 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4152 const u8 *ht_cap_ie, *vht_cap_ie; 4153 const struct ieee80211_ht_cap *ht_cap; 4154 const struct ieee80211_vht_cap *vht_cap; 4155 u8 chains = 1; 4156 4157 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4158 return chains; 4159 4160 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4161 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4162 ht_cap = (void *)(ht_cap_ie + 2); 4163 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4164 /* 4165 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4166 * "Tx Unequal Modulation Supported" fields. 4167 */ 4168 } 4169 4170 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4171 return chains; 4172 4173 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4174 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4175 u8 nss; 4176 u16 tx_mcs_map; 4177 4178 vht_cap = (void *)(vht_cap_ie + 2); 4179 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4180 for (nss = 8; nss > 0; nss--) { 4181 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4182 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4183 break; 4184 } 4185 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4186 chains = max(chains, nss); 4187 } 4188 4189 return chains; 4190 } 4191 4192 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4193 struct cfg80211_bss *cbss) 4194 { 4195 struct ieee80211_local *local = sdata->local; 4196 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4197 const struct ieee80211_ht_cap *ht_cap = NULL; 4198 const struct ieee80211_ht_operation *ht_oper = NULL; 4199 const struct ieee80211_vht_operation *vht_oper = NULL; 4200 struct ieee80211_supported_band *sband; 4201 struct cfg80211_chan_def chandef; 4202 int ret; 4203 u32 i; 4204 bool have_80mhz; 4205 4206 sband = local->hw.wiphy->bands[cbss->channel->band]; 4207 4208 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4209 IEEE80211_STA_DISABLE_80P80MHZ | 4210 IEEE80211_STA_DISABLE_160MHZ); 4211 4212 rcu_read_lock(); 4213 4214 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4215 sband->ht_cap.ht_supported) { 4216 const u8 *ht_oper_ie, *ht_cap_ie; 4217 4218 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4219 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4220 ht_oper = (void *)(ht_oper_ie + 2); 4221 4222 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4223 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4224 ht_cap = (void *)(ht_cap_ie + 2); 4225 4226 if (!ht_cap) { 4227 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4228 ht_oper = NULL; 4229 } 4230 } 4231 4232 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4233 sband->vht_cap.vht_supported) { 4234 const u8 *vht_oper_ie, *vht_cap; 4235 4236 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4237 WLAN_EID_VHT_OPERATION); 4238 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4239 vht_oper = (void *)(vht_oper_ie + 2); 4240 if (vht_oper && !ht_oper) { 4241 vht_oper = NULL; 4242 sdata_info(sdata, 4243 "AP advertised VHT without HT, disabling both\n"); 4244 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4245 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4246 } 4247 4248 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4249 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4250 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4251 vht_oper = NULL; 4252 } 4253 } 4254 4255 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4256 have_80mhz = false; 4257 for (i = 0; i < sband->n_channels; i++) { 4258 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4259 IEEE80211_CHAN_NO_80MHZ)) 4260 continue; 4261 4262 have_80mhz = true; 4263 break; 4264 } 4265 4266 if (!have_80mhz) 4267 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4268 4269 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4270 cbss->channel, 4271 ht_cap, ht_oper, vht_oper, 4272 &chandef, false); 4273 4274 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4275 local->rx_chains); 4276 4277 rcu_read_unlock(); 4278 4279 /* will change later if needed */ 4280 sdata->smps_mode = IEEE80211_SMPS_OFF; 4281 4282 mutex_lock(&local->mtx); 4283 /* 4284 * If this fails (possibly due to channel context sharing 4285 * on incompatible channels, e.g. 80+80 and 160 sharing the 4286 * same control channel) try to use a smaller bandwidth. 4287 */ 4288 ret = ieee80211_vif_use_channel(sdata, &chandef, 4289 IEEE80211_CHANCTX_SHARED); 4290 4291 /* don't downgrade for 5 and 10 MHz channels, though. */ 4292 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4293 chandef.width == NL80211_CHAN_WIDTH_10) 4294 goto out; 4295 4296 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4297 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4298 ret = ieee80211_vif_use_channel(sdata, &chandef, 4299 IEEE80211_CHANCTX_SHARED); 4300 } 4301 out: 4302 mutex_unlock(&local->mtx); 4303 return ret; 4304 } 4305 4306 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4307 struct cfg80211_bss *cbss, bool assoc, 4308 bool override) 4309 { 4310 struct ieee80211_local *local = sdata->local; 4311 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4312 struct ieee80211_bss *bss = (void *)cbss->priv; 4313 struct sta_info *new_sta = NULL; 4314 struct ieee80211_supported_band *sband; 4315 bool have_sta = false; 4316 int err; 4317 4318 sband = local->hw.wiphy->bands[cbss->channel->band]; 4319 4320 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4321 return -EINVAL; 4322 4323 if (assoc) { 4324 rcu_read_lock(); 4325 have_sta = sta_info_get(sdata, cbss->bssid); 4326 rcu_read_unlock(); 4327 } 4328 4329 if (!have_sta) { 4330 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4331 if (!new_sta) 4332 return -ENOMEM; 4333 } 4334 4335 if (new_sta || override) { 4336 err = ieee80211_prep_channel(sdata, cbss); 4337 if (err) { 4338 if (new_sta) 4339 sta_info_free(local, new_sta); 4340 return -EINVAL; 4341 } 4342 } 4343 4344 if (new_sta) { 4345 u32 rates = 0, basic_rates = 0; 4346 bool have_higher_than_11mbit; 4347 int min_rate = INT_MAX, min_rate_index = -1; 4348 struct ieee80211_chanctx_conf *chanctx_conf; 4349 const struct cfg80211_bss_ies *ies; 4350 int shift = ieee80211_vif_get_shift(&sdata->vif); 4351 u32 rate_flags; 4352 4353 rcu_read_lock(); 4354 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4355 if (WARN_ON(!chanctx_conf)) { 4356 rcu_read_unlock(); 4357 sta_info_free(local, new_sta); 4358 return -EINVAL; 4359 } 4360 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4361 rcu_read_unlock(); 4362 4363 ieee80211_get_rates(sband, bss->supp_rates, 4364 bss->supp_rates_len, 4365 &rates, &basic_rates, 4366 &have_higher_than_11mbit, 4367 &min_rate, &min_rate_index, 4368 shift, rate_flags); 4369 4370 /* 4371 * This used to be a workaround for basic rates missing 4372 * in the association response frame. Now that we no 4373 * longer use the basic rates from there, it probably 4374 * doesn't happen any more, but keep the workaround so 4375 * in case some *other* APs are buggy in different ways 4376 * we can connect -- with a warning. 4377 */ 4378 if (!basic_rates && min_rate_index >= 0) { 4379 sdata_info(sdata, 4380 "No basic rates, using min rate instead\n"); 4381 basic_rates = BIT(min_rate_index); 4382 } 4383 4384 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4385 sdata->vif.bss_conf.basic_rates = basic_rates; 4386 4387 /* cf. IEEE 802.11 9.2.12 */ 4388 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 4389 have_higher_than_11mbit) 4390 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4391 else 4392 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4393 4394 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4395 4396 /* set timing information */ 4397 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4398 rcu_read_lock(); 4399 ies = rcu_dereference(cbss->beacon_ies); 4400 if (ies) { 4401 const u8 *tim_ie; 4402 4403 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4404 sdata->vif.bss_conf.sync_device_ts = 4405 bss->device_ts_beacon; 4406 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4407 ies->data, ies->len); 4408 if (tim_ie && tim_ie[1] >= 2) 4409 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4410 else 4411 sdata->vif.bss_conf.sync_dtim_count = 0; 4412 } else if (!ieee80211_hw_check(&sdata->local->hw, 4413 TIMING_BEACON_ONLY)) { 4414 ies = rcu_dereference(cbss->proberesp_ies); 4415 /* must be non-NULL since beacon IEs were NULL */ 4416 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4417 sdata->vif.bss_conf.sync_device_ts = 4418 bss->device_ts_presp; 4419 sdata->vif.bss_conf.sync_dtim_count = 0; 4420 } else { 4421 sdata->vif.bss_conf.sync_tsf = 0; 4422 sdata->vif.bss_conf.sync_device_ts = 0; 4423 sdata->vif.bss_conf.sync_dtim_count = 0; 4424 } 4425 rcu_read_unlock(); 4426 4427 /* tell driver about BSSID, basic rates and timing */ 4428 ieee80211_bss_info_change_notify(sdata, 4429 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4430 BSS_CHANGED_BEACON_INT); 4431 4432 if (assoc) 4433 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4434 4435 err = sta_info_insert(new_sta); 4436 new_sta = NULL; 4437 if (err) { 4438 sdata_info(sdata, 4439 "failed to insert STA entry for the AP (error %d)\n", 4440 err); 4441 return err; 4442 } 4443 } else 4444 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4445 4446 /* Cancel scan to ensure that nothing interferes with connection */ 4447 if (local->scanning) 4448 ieee80211_scan_cancel(local); 4449 4450 return 0; 4451 } 4452 4453 /* config hooks */ 4454 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4455 struct cfg80211_auth_request *req) 4456 { 4457 struct ieee80211_local *local = sdata->local; 4458 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4459 struct ieee80211_mgd_auth_data *auth_data; 4460 u16 auth_alg; 4461 int err; 4462 4463 /* prepare auth data structure */ 4464 4465 switch (req->auth_type) { 4466 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4467 auth_alg = WLAN_AUTH_OPEN; 4468 break; 4469 case NL80211_AUTHTYPE_SHARED_KEY: 4470 if (IS_ERR(local->wep_tx_tfm)) 4471 return -EOPNOTSUPP; 4472 auth_alg = WLAN_AUTH_SHARED_KEY; 4473 break; 4474 case NL80211_AUTHTYPE_FT: 4475 auth_alg = WLAN_AUTH_FT; 4476 break; 4477 case NL80211_AUTHTYPE_NETWORK_EAP: 4478 auth_alg = WLAN_AUTH_LEAP; 4479 break; 4480 case NL80211_AUTHTYPE_SAE: 4481 auth_alg = WLAN_AUTH_SAE; 4482 break; 4483 default: 4484 return -EOPNOTSUPP; 4485 } 4486 4487 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4488 req->ie_len, GFP_KERNEL); 4489 if (!auth_data) 4490 return -ENOMEM; 4491 4492 auth_data->bss = req->bss; 4493 4494 if (req->sae_data_len >= 4) { 4495 __le16 *pos = (__le16 *) req->sae_data; 4496 auth_data->sae_trans = le16_to_cpu(pos[0]); 4497 auth_data->sae_status = le16_to_cpu(pos[1]); 4498 memcpy(auth_data->data, req->sae_data + 4, 4499 req->sae_data_len - 4); 4500 auth_data->data_len += req->sae_data_len - 4; 4501 } 4502 4503 if (req->ie && req->ie_len) { 4504 memcpy(&auth_data->data[auth_data->data_len], 4505 req->ie, req->ie_len); 4506 auth_data->data_len += req->ie_len; 4507 } 4508 4509 if (req->key && req->key_len) { 4510 auth_data->key_len = req->key_len; 4511 auth_data->key_idx = req->key_idx; 4512 memcpy(auth_data->key, req->key, req->key_len); 4513 } 4514 4515 auth_data->algorithm = auth_alg; 4516 4517 /* try to authenticate/probe */ 4518 4519 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4520 ifmgd->assoc_data) { 4521 err = -EBUSY; 4522 goto err_free; 4523 } 4524 4525 if (ifmgd->auth_data) 4526 ieee80211_destroy_auth_data(sdata, false); 4527 4528 /* prep auth_data so we don't go into idle on disassoc */ 4529 ifmgd->auth_data = auth_data; 4530 4531 if (ifmgd->associated) { 4532 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4533 4534 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4535 WLAN_REASON_UNSPECIFIED, 4536 false, frame_buf); 4537 4538 ieee80211_report_disconnect(sdata, frame_buf, 4539 sizeof(frame_buf), true, 4540 WLAN_REASON_UNSPECIFIED); 4541 } 4542 4543 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4544 4545 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4546 if (err) 4547 goto err_clear; 4548 4549 err = ieee80211_auth(sdata); 4550 if (err) { 4551 sta_info_destroy_addr(sdata, req->bss->bssid); 4552 goto err_clear; 4553 } 4554 4555 /* hold our own reference */ 4556 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4557 return 0; 4558 4559 err_clear: 4560 eth_zero_addr(ifmgd->bssid); 4561 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4562 ifmgd->auth_data = NULL; 4563 mutex_lock(&sdata->local->mtx); 4564 ieee80211_vif_release_channel(sdata); 4565 mutex_unlock(&sdata->local->mtx); 4566 err_free: 4567 kfree(auth_data); 4568 return err; 4569 } 4570 4571 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4572 struct cfg80211_assoc_request *req) 4573 { 4574 struct ieee80211_local *local = sdata->local; 4575 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4576 struct ieee80211_bss *bss = (void *)req->bss->priv; 4577 struct ieee80211_mgd_assoc_data *assoc_data; 4578 const struct cfg80211_bss_ies *beacon_ies; 4579 struct ieee80211_supported_band *sband; 4580 const u8 *ssidie, *ht_ie, *vht_ie; 4581 int i, err; 4582 bool override = false; 4583 4584 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4585 if (!assoc_data) 4586 return -ENOMEM; 4587 4588 rcu_read_lock(); 4589 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4590 if (!ssidie) { 4591 rcu_read_unlock(); 4592 kfree(assoc_data); 4593 return -EINVAL; 4594 } 4595 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4596 assoc_data->ssid_len = ssidie[1]; 4597 rcu_read_unlock(); 4598 4599 if (ifmgd->associated) { 4600 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4601 4602 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4603 WLAN_REASON_UNSPECIFIED, 4604 false, frame_buf); 4605 4606 ieee80211_report_disconnect(sdata, frame_buf, 4607 sizeof(frame_buf), true, 4608 WLAN_REASON_UNSPECIFIED); 4609 } 4610 4611 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4612 err = -EBUSY; 4613 goto err_free; 4614 } 4615 4616 if (ifmgd->assoc_data) { 4617 err = -EBUSY; 4618 goto err_free; 4619 } 4620 4621 if (ifmgd->auth_data) { 4622 bool match; 4623 4624 /* keep sta info, bssid if matching */ 4625 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4626 ieee80211_destroy_auth_data(sdata, match); 4627 } 4628 4629 /* prepare assoc data */ 4630 4631 ifmgd->beacon_crc_valid = false; 4632 4633 assoc_data->wmm = bss->wmm_used && 4634 (local->hw.queues >= IEEE80211_NUM_ACS); 4635 4636 /* 4637 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4638 * We still associate in non-HT mode (11a/b/g) if any one of these 4639 * ciphers is configured as pairwise. 4640 * We can set this to true for non-11n hardware, that'll be checked 4641 * separately along with the peer capabilities. 4642 */ 4643 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4644 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4645 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4646 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4647 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4648 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4649 netdev_info(sdata->dev, 4650 "disabling HT/VHT due to WEP/TKIP use\n"); 4651 } 4652 } 4653 4654 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4655 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4656 if (!sband->ht_cap.ht_supported || 4657 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4658 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4659 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4660 if (!bss->wmm_used && 4661 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4662 netdev_info(sdata->dev, 4663 "disabling HT as WMM/QoS is not supported by the AP\n"); 4664 } 4665 4666 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4667 if (!sband->vht_cap.vht_supported || 4668 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4669 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4670 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4671 if (!bss->wmm_used && 4672 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4673 netdev_info(sdata->dev, 4674 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4675 } 4676 4677 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4678 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4679 sizeof(ifmgd->ht_capa_mask)); 4680 4681 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4682 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4683 sizeof(ifmgd->vht_capa_mask)); 4684 4685 if (req->ie && req->ie_len) { 4686 memcpy(assoc_data->ie, req->ie, req->ie_len); 4687 assoc_data->ie_len = req->ie_len; 4688 } 4689 4690 assoc_data->bss = req->bss; 4691 4692 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4693 if (ifmgd->powersave) 4694 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4695 else 4696 sdata->smps_mode = IEEE80211_SMPS_OFF; 4697 } else 4698 sdata->smps_mode = ifmgd->req_smps; 4699 4700 assoc_data->capability = req->bss->capability; 4701 assoc_data->supp_rates = bss->supp_rates; 4702 assoc_data->supp_rates_len = bss->supp_rates_len; 4703 4704 rcu_read_lock(); 4705 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4706 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4707 assoc_data->ap_ht_param = 4708 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4709 else 4710 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4711 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4712 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4713 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4714 sizeof(struct ieee80211_vht_cap)); 4715 else 4716 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4717 rcu_read_unlock(); 4718 4719 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4720 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4721 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4722 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4723 4724 if (bss->wmm_used && bss->uapsd_supported && 4725 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4726 assoc_data->uapsd = true; 4727 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4728 } else { 4729 assoc_data->uapsd = false; 4730 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4731 } 4732 4733 if (req->prev_bssid) 4734 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4735 4736 if (req->use_mfp) { 4737 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4738 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4739 } else { 4740 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4741 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4742 } 4743 4744 if (req->flags & ASSOC_REQ_USE_RRM) 4745 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4746 else 4747 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4748 4749 if (req->crypto.control_port) 4750 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4751 else 4752 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4753 4754 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4755 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4756 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4757 sdata->vif.type); 4758 4759 /* kick off associate process */ 4760 4761 ifmgd->assoc_data = assoc_data; 4762 ifmgd->dtim_period = 0; 4763 ifmgd->have_beacon = false; 4764 4765 /* override HT/VHT configuration only if the AP and we support it */ 4766 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4767 struct ieee80211_sta_ht_cap sta_ht_cap; 4768 4769 if (req->flags & ASSOC_REQ_DISABLE_HT) 4770 override = true; 4771 4772 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4773 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4774 4775 /* check for 40 MHz disable override */ 4776 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4777 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4778 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4779 override = true; 4780 4781 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4782 req->flags & ASSOC_REQ_DISABLE_VHT) 4783 override = true; 4784 } 4785 4786 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4787 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4788 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4789 } 4790 4791 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4792 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4793 4794 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4795 if (err) 4796 goto err_clear; 4797 4798 rcu_read_lock(); 4799 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4800 4801 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4802 !beacon_ies) { 4803 /* 4804 * Wait up to one beacon interval ... 4805 * should this be more if we miss one? 4806 */ 4807 sdata_info(sdata, "waiting for beacon from %pM\n", 4808 ifmgd->bssid); 4809 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4810 assoc_data->timeout_started = true; 4811 assoc_data->need_beacon = true; 4812 } else if (beacon_ies) { 4813 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4814 beacon_ies->data, 4815 beacon_ies->len); 4816 u8 dtim_count = 0; 4817 4818 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4819 const struct ieee80211_tim_ie *tim; 4820 tim = (void *)(tim_ie + 2); 4821 ifmgd->dtim_period = tim->dtim_period; 4822 dtim_count = tim->dtim_count; 4823 } 4824 ifmgd->have_beacon = true; 4825 assoc_data->timeout = jiffies; 4826 assoc_data->timeout_started = true; 4827 4828 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4829 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4830 sdata->vif.bss_conf.sync_device_ts = 4831 bss->device_ts_beacon; 4832 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4833 } 4834 } else { 4835 assoc_data->timeout = jiffies; 4836 assoc_data->timeout_started = true; 4837 } 4838 rcu_read_unlock(); 4839 4840 run_again(sdata, assoc_data->timeout); 4841 4842 if (bss->corrupt_data) { 4843 char *corrupt_type = "data"; 4844 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4845 if (bss->corrupt_data & 4846 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4847 corrupt_type = "beacon and probe response"; 4848 else 4849 corrupt_type = "beacon"; 4850 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4851 corrupt_type = "probe response"; 4852 sdata_info(sdata, "associating with AP with corrupt %s\n", 4853 corrupt_type); 4854 } 4855 4856 return 0; 4857 err_clear: 4858 eth_zero_addr(ifmgd->bssid); 4859 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4860 ifmgd->assoc_data = NULL; 4861 err_free: 4862 kfree(assoc_data); 4863 return err; 4864 } 4865 4866 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4867 struct cfg80211_deauth_request *req) 4868 { 4869 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4870 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4871 bool tx = !req->local_state_change; 4872 4873 if (ifmgd->auth_data && 4874 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4875 sdata_info(sdata, 4876 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4877 req->bssid, req->reason_code, 4878 ieee80211_get_reason_code_string(req->reason_code)); 4879 4880 drv_mgd_prepare_tx(sdata->local, sdata); 4881 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4882 IEEE80211_STYPE_DEAUTH, 4883 req->reason_code, tx, 4884 frame_buf); 4885 ieee80211_destroy_auth_data(sdata, false); 4886 ieee80211_report_disconnect(sdata, frame_buf, 4887 sizeof(frame_buf), true, 4888 req->reason_code); 4889 4890 return 0; 4891 } 4892 4893 if (ifmgd->assoc_data && 4894 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4895 sdata_info(sdata, 4896 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4897 req->bssid, req->reason_code, 4898 ieee80211_get_reason_code_string(req->reason_code)); 4899 4900 drv_mgd_prepare_tx(sdata->local, sdata); 4901 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4902 IEEE80211_STYPE_DEAUTH, 4903 req->reason_code, tx, 4904 frame_buf); 4905 ieee80211_destroy_assoc_data(sdata, false); 4906 ieee80211_report_disconnect(sdata, frame_buf, 4907 sizeof(frame_buf), true, 4908 req->reason_code); 4909 return 0; 4910 } 4911 4912 if (ifmgd->associated && 4913 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4914 sdata_info(sdata, 4915 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4916 req->bssid, req->reason_code, 4917 ieee80211_get_reason_code_string(req->reason_code)); 4918 4919 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4920 req->reason_code, tx, frame_buf); 4921 ieee80211_report_disconnect(sdata, frame_buf, 4922 sizeof(frame_buf), true, 4923 req->reason_code); 4924 return 0; 4925 } 4926 4927 return -ENOTCONN; 4928 } 4929 4930 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4931 struct cfg80211_disassoc_request *req) 4932 { 4933 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4934 u8 bssid[ETH_ALEN]; 4935 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4936 4937 /* 4938 * cfg80211 should catch this ... but it's racy since 4939 * we can receive a disassoc frame, process it, hand it 4940 * to cfg80211 while that's in a locked section already 4941 * trying to tell us that the user wants to disconnect. 4942 */ 4943 if (ifmgd->associated != req->bss) 4944 return -ENOLINK; 4945 4946 sdata_info(sdata, 4947 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4948 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4949 4950 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4951 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4952 req->reason_code, !req->local_state_change, 4953 frame_buf); 4954 4955 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 4956 req->reason_code); 4957 4958 return 0; 4959 } 4960 4961 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4962 { 4963 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4964 4965 /* 4966 * Make sure some work items will not run after this, 4967 * they will not do anything but might not have been 4968 * cancelled when disconnecting. 4969 */ 4970 cancel_work_sync(&ifmgd->monitor_work); 4971 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4972 cancel_work_sync(&ifmgd->request_smps_work); 4973 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4974 cancel_work_sync(&ifmgd->chswitch_work); 4975 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4976 4977 sdata_lock(sdata); 4978 if (ifmgd->assoc_data) { 4979 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4980 ieee80211_destroy_assoc_data(sdata, false); 4981 cfg80211_assoc_timeout(sdata->dev, bss); 4982 } 4983 if (ifmgd->auth_data) 4984 ieee80211_destroy_auth_data(sdata, false); 4985 spin_lock_bh(&ifmgd->teardown_lock); 4986 if (ifmgd->teardown_skb) { 4987 kfree_skb(ifmgd->teardown_skb); 4988 ifmgd->teardown_skb = NULL; 4989 ifmgd->orig_teardown_skb = NULL; 4990 } 4991 spin_unlock_bh(&ifmgd->teardown_lock); 4992 del_timer_sync(&ifmgd->timer); 4993 sdata_unlock(sdata); 4994 } 4995 4996 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4997 enum nl80211_cqm_rssi_threshold_event rssi_event, 4998 gfp_t gfp) 4999 { 5000 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5001 5002 trace_api_cqm_rssi_notify(sdata, rssi_event); 5003 5004 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 5005 } 5006 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5007 5008 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5009 { 5010 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5011 5012 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5013 5014 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5015 } 5016 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5017