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 new_ap_level = pwr_level_80211h; 1383 1384 if (sdata->ap_power_level == new_ap_level) 1385 return 0; 1386 1387 sdata_dbg(sdata, 1388 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1389 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1390 sdata->u.mgd.bssid); 1391 } else { /* has_cisco_pwr is always true here. */ 1392 new_ap_level = pwr_level_cisco; 1393 1394 if (sdata->ap_power_level == new_ap_level) 1395 return 0; 1396 1397 sdata_dbg(sdata, 1398 "Limiting TX power to %d dBm as advertised by %pM\n", 1399 pwr_level_cisco, sdata->u.mgd.bssid); 1400 } 1401 1402 sdata->ap_power_level = new_ap_level; 1403 if (__ieee80211_recalc_txpower(sdata)) 1404 return BSS_CHANGED_TXPOWER; 1405 return 0; 1406 } 1407 1408 /* powersave */ 1409 static void ieee80211_enable_ps(struct ieee80211_local *local, 1410 struct ieee80211_sub_if_data *sdata) 1411 { 1412 struct ieee80211_conf *conf = &local->hw.conf; 1413 1414 /* 1415 * If we are scanning right now then the parameters will 1416 * take effect when scan finishes. 1417 */ 1418 if (local->scanning) 1419 return; 1420 1421 if (conf->dynamic_ps_timeout > 0 && 1422 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) { 1423 mod_timer(&local->dynamic_ps_timer, jiffies + 1424 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1425 } else { 1426 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) 1427 ieee80211_send_nullfunc(local, sdata, true); 1428 1429 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1430 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 1431 return; 1432 1433 conf->flags |= IEEE80211_CONF_PS; 1434 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1435 } 1436 } 1437 1438 static void ieee80211_change_ps(struct ieee80211_local *local) 1439 { 1440 struct ieee80211_conf *conf = &local->hw.conf; 1441 1442 if (local->ps_sdata) { 1443 ieee80211_enable_ps(local, local->ps_sdata); 1444 } else if (conf->flags & IEEE80211_CONF_PS) { 1445 conf->flags &= ~IEEE80211_CONF_PS; 1446 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1447 del_timer_sync(&local->dynamic_ps_timer); 1448 cancel_work_sync(&local->dynamic_ps_enable_work); 1449 } 1450 } 1451 1452 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1453 { 1454 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1455 struct sta_info *sta = NULL; 1456 bool authorized = false; 1457 1458 if (!mgd->powersave) 1459 return false; 1460 1461 if (mgd->broken_ap) 1462 return false; 1463 1464 if (!mgd->associated) 1465 return false; 1466 1467 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1468 return false; 1469 1470 if (!mgd->have_beacon) 1471 return false; 1472 1473 rcu_read_lock(); 1474 sta = sta_info_get(sdata, mgd->bssid); 1475 if (sta) 1476 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1477 rcu_read_unlock(); 1478 1479 return authorized; 1480 } 1481 1482 /* need to hold RTNL or interface lock */ 1483 void ieee80211_recalc_ps(struct ieee80211_local *local) 1484 { 1485 struct ieee80211_sub_if_data *sdata, *found = NULL; 1486 int count = 0; 1487 int timeout; 1488 1489 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) { 1490 local->ps_sdata = NULL; 1491 return; 1492 } 1493 1494 list_for_each_entry(sdata, &local->interfaces, list) { 1495 if (!ieee80211_sdata_running(sdata)) 1496 continue; 1497 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1498 /* If an AP vif is found, then disable PS 1499 * by setting the count to zero thereby setting 1500 * ps_sdata to NULL. 1501 */ 1502 count = 0; 1503 break; 1504 } 1505 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1506 continue; 1507 found = sdata; 1508 count++; 1509 } 1510 1511 if (count == 1 && ieee80211_powersave_allowed(found)) { 1512 u8 dtimper = found->u.mgd.dtim_period; 1513 s32 beaconint_us; 1514 1515 beaconint_us = ieee80211_tu_to_usec( 1516 found->vif.bss_conf.beacon_int); 1517 1518 timeout = local->dynamic_ps_forced_timeout; 1519 if (timeout < 0) 1520 timeout = 100; 1521 local->hw.conf.dynamic_ps_timeout = timeout; 1522 1523 /* If the TIM IE is invalid, pretend the value is 1 */ 1524 if (!dtimper) 1525 dtimper = 1; 1526 1527 local->hw.conf.ps_dtim_period = dtimper; 1528 local->ps_sdata = found; 1529 } else { 1530 local->ps_sdata = NULL; 1531 } 1532 1533 ieee80211_change_ps(local); 1534 } 1535 1536 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1537 { 1538 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1539 1540 if (sdata->vif.bss_conf.ps != ps_allowed) { 1541 sdata->vif.bss_conf.ps = ps_allowed; 1542 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1543 } 1544 } 1545 1546 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1547 { 1548 struct ieee80211_local *local = 1549 container_of(work, struct ieee80211_local, 1550 dynamic_ps_disable_work); 1551 1552 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1553 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1554 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1555 } 1556 1557 ieee80211_wake_queues_by_reason(&local->hw, 1558 IEEE80211_MAX_QUEUE_MAP, 1559 IEEE80211_QUEUE_STOP_REASON_PS, 1560 false); 1561 } 1562 1563 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1564 { 1565 struct ieee80211_local *local = 1566 container_of(work, struct ieee80211_local, 1567 dynamic_ps_enable_work); 1568 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1569 struct ieee80211_if_managed *ifmgd; 1570 unsigned long flags; 1571 int q; 1572 1573 /* can only happen when PS was just disabled anyway */ 1574 if (!sdata) 1575 return; 1576 1577 ifmgd = &sdata->u.mgd; 1578 1579 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1580 return; 1581 1582 if (local->hw.conf.dynamic_ps_timeout > 0) { 1583 /* don't enter PS if TX frames are pending */ 1584 if (drv_tx_frames_pending(local)) { 1585 mod_timer(&local->dynamic_ps_timer, jiffies + 1586 msecs_to_jiffies( 1587 local->hw.conf.dynamic_ps_timeout)); 1588 return; 1589 } 1590 1591 /* 1592 * transmission can be stopped by others which leads to 1593 * dynamic_ps_timer expiry. Postpone the ps timer if it 1594 * is not the actual idle state. 1595 */ 1596 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1597 for (q = 0; q < local->hw.queues; q++) { 1598 if (local->queue_stop_reasons[q]) { 1599 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1600 flags); 1601 mod_timer(&local->dynamic_ps_timer, jiffies + 1602 msecs_to_jiffies( 1603 local->hw.conf.dynamic_ps_timeout)); 1604 return; 1605 } 1606 } 1607 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1608 } 1609 1610 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 1611 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1612 if (drv_tx_frames_pending(local)) { 1613 mod_timer(&local->dynamic_ps_timer, jiffies + 1614 msecs_to_jiffies( 1615 local->hw.conf.dynamic_ps_timeout)); 1616 } else { 1617 ieee80211_send_nullfunc(local, sdata, true); 1618 /* Flush to get the tx status of nullfunc frame */ 1619 ieee80211_flush_queues(local, sdata, false); 1620 } 1621 } 1622 1623 if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 1624 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) || 1625 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1626 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1627 local->hw.conf.flags |= IEEE80211_CONF_PS; 1628 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1629 } 1630 } 1631 1632 void ieee80211_dynamic_ps_timer(unsigned long data) 1633 { 1634 struct ieee80211_local *local = (void *) data; 1635 1636 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1637 } 1638 1639 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1640 { 1641 struct delayed_work *delayed_work = 1642 container_of(work, struct delayed_work, work); 1643 struct ieee80211_sub_if_data *sdata = 1644 container_of(delayed_work, struct ieee80211_sub_if_data, 1645 dfs_cac_timer_work); 1646 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1647 1648 mutex_lock(&sdata->local->mtx); 1649 if (sdata->wdev.cac_started) { 1650 ieee80211_vif_release_channel(sdata); 1651 cfg80211_cac_event(sdata->dev, &chandef, 1652 NL80211_RADAR_CAC_FINISHED, 1653 GFP_KERNEL); 1654 } 1655 mutex_unlock(&sdata->local->mtx); 1656 } 1657 1658 static bool 1659 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1660 { 1661 struct ieee80211_local *local = sdata->local; 1662 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1663 bool ret = false; 1664 int ac; 1665 1666 if (local->hw.queues < IEEE80211_NUM_ACS) 1667 return false; 1668 1669 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1670 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1671 int non_acm_ac; 1672 unsigned long now = jiffies; 1673 1674 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1675 tx_tspec->admitted_time && 1676 time_after(now, tx_tspec->time_slice_start + HZ)) { 1677 tx_tspec->consumed_tx_time = 0; 1678 tx_tspec->time_slice_start = now; 1679 1680 if (tx_tspec->downgraded) 1681 tx_tspec->action = 1682 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1683 } 1684 1685 switch (tx_tspec->action) { 1686 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1687 /* take the original parameters */ 1688 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1689 sdata_err(sdata, 1690 "failed to set TX queue parameters for queue %d\n", 1691 ac); 1692 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1693 tx_tspec->downgraded = false; 1694 ret = true; 1695 break; 1696 case TX_TSPEC_ACTION_DOWNGRADE: 1697 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1698 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1699 ret = true; 1700 break; 1701 } 1702 /* downgrade next lower non-ACM AC */ 1703 for (non_acm_ac = ac + 1; 1704 non_acm_ac < IEEE80211_NUM_ACS; 1705 non_acm_ac++) 1706 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1707 break; 1708 /* The loop will result in using BK even if it requires 1709 * admission control, such configuration makes no sense 1710 * and we have to transmit somehow - the AC selection 1711 * does the same thing. 1712 */ 1713 if (drv_conf_tx(local, sdata, ac, 1714 &sdata->tx_conf[non_acm_ac])) 1715 sdata_err(sdata, 1716 "failed to set TX queue parameters for queue %d\n", 1717 ac); 1718 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1719 ret = true; 1720 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1721 tx_tspec->time_slice_start + HZ - now + 1); 1722 break; 1723 case TX_TSPEC_ACTION_NONE: 1724 /* nothing now */ 1725 break; 1726 } 1727 } 1728 1729 return ret; 1730 } 1731 1732 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1733 { 1734 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1735 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1736 } 1737 1738 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1739 { 1740 struct ieee80211_sub_if_data *sdata; 1741 1742 sdata = container_of(work, struct ieee80211_sub_if_data, 1743 u.mgd.tx_tspec_wk.work); 1744 ieee80211_sta_handle_tspec_ac_params(sdata); 1745 } 1746 1747 /* MLME */ 1748 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1749 struct ieee80211_sub_if_data *sdata, 1750 const u8 *wmm_param, size_t wmm_param_len) 1751 { 1752 struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS]; 1753 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1754 size_t left; 1755 int count, ac; 1756 const u8 *pos; 1757 u8 uapsd_queues = 0; 1758 1759 if (!local->ops->conf_tx) 1760 return false; 1761 1762 if (local->hw.queues < IEEE80211_NUM_ACS) 1763 return false; 1764 1765 if (!wmm_param) 1766 return false; 1767 1768 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1769 return false; 1770 1771 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1772 uapsd_queues = ifmgd->uapsd_queues; 1773 1774 count = wmm_param[6] & 0x0f; 1775 if (count == ifmgd->wmm_last_param_set) 1776 return false; 1777 ifmgd->wmm_last_param_set = count; 1778 1779 pos = wmm_param + 8; 1780 left = wmm_param_len - 8; 1781 1782 memset(¶ms, 0, sizeof(params)); 1783 1784 sdata->wmm_acm = 0; 1785 for (; left >= 4; left -= 4, pos += 4) { 1786 int aci = (pos[0] >> 5) & 0x03; 1787 int acm = (pos[0] >> 4) & 0x01; 1788 bool uapsd = false; 1789 1790 switch (aci) { 1791 case 1: /* AC_BK */ 1792 ac = IEEE80211_AC_BK; 1793 if (acm) 1794 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1795 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1796 uapsd = true; 1797 break; 1798 case 2: /* AC_VI */ 1799 ac = IEEE80211_AC_VI; 1800 if (acm) 1801 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1802 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1803 uapsd = true; 1804 break; 1805 case 3: /* AC_VO */ 1806 ac = IEEE80211_AC_VO; 1807 if (acm) 1808 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1809 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1810 uapsd = true; 1811 break; 1812 case 0: /* AC_BE */ 1813 default: 1814 ac = IEEE80211_AC_BE; 1815 if (acm) 1816 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1817 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1818 uapsd = true; 1819 break; 1820 } 1821 1822 params[ac].aifs = pos[0] & 0x0f; 1823 1824 if (params[ac].aifs < 2) { 1825 sdata_info(sdata, 1826 "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n", 1827 params[ac].aifs, aci); 1828 params[ac].aifs = 2; 1829 } 1830 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1831 params[ac].cw_min = ecw2cw(pos[1] & 0x0f); 1832 params[ac].txop = get_unaligned_le16(pos + 2); 1833 params[ac].acm = acm; 1834 params[ac].uapsd = uapsd; 1835 1836 if (params[ac].cw_min > params[ac].cw_max) { 1837 sdata_info(sdata, 1838 "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n", 1839 params[ac].cw_min, params[ac].cw_max, aci); 1840 return false; 1841 } 1842 } 1843 1844 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1845 mlme_dbg(sdata, 1846 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1847 ac, params[ac].acm, 1848 params[ac].aifs, params[ac].cw_min, params[ac].cw_max, 1849 params[ac].txop, params[ac].uapsd, 1850 ifmgd->tx_tspec[ac].downgraded); 1851 sdata->tx_conf[ac] = params[ac]; 1852 if (!ifmgd->tx_tspec[ac].downgraded && 1853 drv_conf_tx(local, sdata, ac, ¶ms[ac])) 1854 sdata_err(sdata, 1855 "failed to set TX queue parameters for AC %d\n", 1856 ac); 1857 } 1858 1859 /* enable WMM or activate new settings */ 1860 sdata->vif.bss_conf.qos = true; 1861 return true; 1862 } 1863 1864 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1865 { 1866 lockdep_assert_held(&sdata->local->mtx); 1867 1868 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1869 ieee80211_run_deferred_scan(sdata->local); 1870 } 1871 1872 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1873 { 1874 mutex_lock(&sdata->local->mtx); 1875 __ieee80211_stop_poll(sdata); 1876 mutex_unlock(&sdata->local->mtx); 1877 } 1878 1879 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1880 u16 capab, bool erp_valid, u8 erp) 1881 { 1882 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1883 u32 changed = 0; 1884 bool use_protection; 1885 bool use_short_preamble; 1886 bool use_short_slot; 1887 1888 if (erp_valid) { 1889 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1890 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1891 } else { 1892 use_protection = false; 1893 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1894 } 1895 1896 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1897 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1898 use_short_slot = true; 1899 1900 if (use_protection != bss_conf->use_cts_prot) { 1901 bss_conf->use_cts_prot = use_protection; 1902 changed |= BSS_CHANGED_ERP_CTS_PROT; 1903 } 1904 1905 if (use_short_preamble != bss_conf->use_short_preamble) { 1906 bss_conf->use_short_preamble = use_short_preamble; 1907 changed |= BSS_CHANGED_ERP_PREAMBLE; 1908 } 1909 1910 if (use_short_slot != bss_conf->use_short_slot) { 1911 bss_conf->use_short_slot = use_short_slot; 1912 changed |= BSS_CHANGED_ERP_SLOT; 1913 } 1914 1915 return changed; 1916 } 1917 1918 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1919 struct cfg80211_bss *cbss, 1920 u32 bss_info_changed) 1921 { 1922 struct ieee80211_bss *bss = (void *)cbss->priv; 1923 struct ieee80211_local *local = sdata->local; 1924 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1925 1926 bss_info_changed |= BSS_CHANGED_ASSOC; 1927 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1928 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1929 1930 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1931 beacon_loss_count * bss_conf->beacon_int)); 1932 1933 sdata->u.mgd.associated = cbss; 1934 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1935 1936 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1937 1938 if (sdata->vif.p2p || 1939 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 1940 const struct cfg80211_bss_ies *ies; 1941 1942 rcu_read_lock(); 1943 ies = rcu_dereference(cbss->ies); 1944 if (ies) { 1945 int ret; 1946 1947 ret = cfg80211_get_p2p_attr( 1948 ies->data, ies->len, 1949 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1950 (u8 *) &bss_conf->p2p_noa_attr, 1951 sizeof(bss_conf->p2p_noa_attr)); 1952 if (ret >= 2) { 1953 sdata->u.mgd.p2p_noa_index = 1954 bss_conf->p2p_noa_attr.index; 1955 bss_info_changed |= BSS_CHANGED_P2P_PS; 1956 } 1957 } 1958 rcu_read_unlock(); 1959 } 1960 1961 /* just to be sure */ 1962 ieee80211_stop_poll(sdata); 1963 1964 ieee80211_led_assoc(local, 1); 1965 1966 if (sdata->u.mgd.have_beacon) { 1967 /* 1968 * If the AP is buggy we may get here with no DTIM period 1969 * known, so assume it's 1 which is the only safe assumption 1970 * in that case, although if the TIM IE is broken powersave 1971 * probably just won't work at all. 1972 */ 1973 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1974 bss_conf->beacon_rate = bss->beacon_rate; 1975 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1976 } else { 1977 bss_conf->beacon_rate = NULL; 1978 bss_conf->dtim_period = 0; 1979 } 1980 1981 bss_conf->assoc = 1; 1982 1983 /* Tell the driver to monitor connection quality (if supported) */ 1984 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1985 bss_conf->cqm_rssi_thold) 1986 bss_info_changed |= BSS_CHANGED_CQM; 1987 1988 /* Enable ARP filtering */ 1989 if (bss_conf->arp_addr_cnt) 1990 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1991 1992 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1993 1994 mutex_lock(&local->iflist_mtx); 1995 ieee80211_recalc_ps(local); 1996 mutex_unlock(&local->iflist_mtx); 1997 1998 ieee80211_recalc_smps(sdata); 1999 ieee80211_recalc_ps_vif(sdata); 2000 2001 netif_carrier_on(sdata->dev); 2002 } 2003 2004 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 2005 u16 stype, u16 reason, bool tx, 2006 u8 *frame_buf) 2007 { 2008 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2009 struct ieee80211_local *local = sdata->local; 2010 u32 changed = 0; 2011 2012 sdata_assert_lock(sdata); 2013 2014 if (WARN_ON_ONCE(tx && !frame_buf)) 2015 return; 2016 2017 if (WARN_ON(!ifmgd->associated)) 2018 return; 2019 2020 ieee80211_stop_poll(sdata); 2021 2022 ifmgd->associated = NULL; 2023 netif_carrier_off(sdata->dev); 2024 2025 /* 2026 * if we want to get out of ps before disassoc (why?) we have 2027 * to do it before sending disassoc, as otherwise the null-packet 2028 * won't be valid. 2029 */ 2030 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2031 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2032 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2033 } 2034 local->ps_sdata = NULL; 2035 2036 /* disable per-vif ps */ 2037 ieee80211_recalc_ps_vif(sdata); 2038 2039 /* make sure ongoing transmission finishes */ 2040 synchronize_net(); 2041 2042 /* 2043 * drop any frame before deauth/disassoc, this can be data or 2044 * management frame. Since we are disconnecting, we should not 2045 * insist sending these frames which can take time and delay 2046 * the disconnection and possible the roaming. 2047 */ 2048 if (tx) 2049 ieee80211_flush_queues(local, sdata, true); 2050 2051 /* deauthenticate/disassociate now */ 2052 if (tx || frame_buf) 2053 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2054 reason, tx, frame_buf); 2055 2056 /* flush out frame - make sure the deauth was actually sent */ 2057 if (tx) 2058 ieee80211_flush_queues(local, sdata, false); 2059 2060 /* clear bssid only after building the needed mgmt frames */ 2061 eth_zero_addr(ifmgd->bssid); 2062 2063 /* remove AP and TDLS peers */ 2064 sta_info_flush(sdata); 2065 2066 /* finally reset all BSS / config parameters */ 2067 changed |= ieee80211_reset_erp_info(sdata); 2068 2069 ieee80211_led_assoc(local, 0); 2070 changed |= BSS_CHANGED_ASSOC; 2071 sdata->vif.bss_conf.assoc = false; 2072 2073 ifmgd->p2p_noa_index = -1; 2074 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2075 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2076 2077 /* on the next assoc, re-program HT/VHT parameters */ 2078 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2079 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2080 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2081 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2082 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER; 2083 2084 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2085 2086 del_timer_sync(&local->dynamic_ps_timer); 2087 cancel_work_sync(&local->dynamic_ps_enable_work); 2088 2089 /* Disable ARP filtering */ 2090 if (sdata->vif.bss_conf.arp_addr_cnt) 2091 changed |= BSS_CHANGED_ARP_FILTER; 2092 2093 sdata->vif.bss_conf.qos = false; 2094 changed |= BSS_CHANGED_QOS; 2095 2096 /* The BSSID (not really interesting) and HT changed */ 2097 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2098 ieee80211_bss_info_change_notify(sdata, changed); 2099 2100 /* disassociated - set to defaults now */ 2101 ieee80211_set_wmm_default(sdata, false, false); 2102 2103 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2104 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2105 del_timer_sync(&sdata->u.mgd.timer); 2106 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2107 2108 sdata->vif.bss_conf.dtim_period = 0; 2109 sdata->vif.bss_conf.beacon_rate = NULL; 2110 2111 ifmgd->have_beacon = false; 2112 2113 ifmgd->flags = 0; 2114 mutex_lock(&local->mtx); 2115 ieee80211_vif_release_channel(sdata); 2116 2117 sdata->vif.csa_active = false; 2118 ifmgd->csa_waiting_bcn = false; 2119 ifmgd->csa_ignored_same_chan = false; 2120 if (sdata->csa_block_tx) { 2121 ieee80211_wake_vif_queues(local, sdata, 2122 IEEE80211_QUEUE_STOP_REASON_CSA); 2123 sdata->csa_block_tx = false; 2124 } 2125 mutex_unlock(&local->mtx); 2126 2127 /* existing TX TSPEC sessions no longer exist */ 2128 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2129 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2130 2131 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2132 } 2133 2134 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2135 struct ieee80211_hdr *hdr) 2136 { 2137 /* 2138 * We can postpone the mgd.timer whenever receiving unicast frames 2139 * from AP because we know that the connection is working both ways 2140 * at that time. But multicast frames (and hence also beacons) must 2141 * be ignored here, because we need to trigger the timer during 2142 * data idle periods for sending the periodic probe request to the 2143 * AP we're connected to. 2144 */ 2145 if (is_multicast_ether_addr(hdr->addr1)) 2146 return; 2147 2148 ieee80211_sta_reset_conn_monitor(sdata); 2149 } 2150 2151 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2152 { 2153 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2154 struct ieee80211_local *local = sdata->local; 2155 2156 mutex_lock(&local->mtx); 2157 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2158 goto out; 2159 2160 __ieee80211_stop_poll(sdata); 2161 2162 mutex_lock(&local->iflist_mtx); 2163 ieee80211_recalc_ps(local); 2164 mutex_unlock(&local->iflist_mtx); 2165 2166 if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 2167 goto out; 2168 2169 /* 2170 * We've received a probe response, but are not sure whether 2171 * we have or will be receiving any beacons or data, so let's 2172 * schedule the timers again, just in case. 2173 */ 2174 ieee80211_sta_reset_beacon_monitor(sdata); 2175 2176 mod_timer(&ifmgd->conn_mon_timer, 2177 round_jiffies_up(jiffies + 2178 IEEE80211_CONNECTION_IDLE_TIME)); 2179 out: 2180 mutex_unlock(&local->mtx); 2181 } 2182 2183 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2184 struct ieee80211_hdr *hdr, 2185 u16 tx_time) 2186 { 2187 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2188 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2189 int ac = ieee80211_ac_from_tid(tid); 2190 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2191 unsigned long now = jiffies; 2192 2193 if (likely(!tx_tspec->admitted_time)) 2194 return; 2195 2196 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2197 tx_tspec->consumed_tx_time = 0; 2198 tx_tspec->time_slice_start = now; 2199 2200 if (tx_tspec->downgraded) { 2201 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2202 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2203 } 2204 } 2205 2206 if (tx_tspec->downgraded) 2207 return; 2208 2209 tx_tspec->consumed_tx_time += tx_time; 2210 2211 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2212 tx_tspec->downgraded = true; 2213 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2214 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2215 } 2216 } 2217 2218 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2219 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2220 { 2221 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2222 2223 if (!ieee80211_is_data(hdr->frame_control)) 2224 return; 2225 2226 if (ieee80211_is_nullfunc(hdr->frame_control) && 2227 sdata->u.mgd.probe_send_count > 0) { 2228 if (ack) 2229 ieee80211_sta_reset_conn_monitor(sdata); 2230 else 2231 sdata->u.mgd.nullfunc_failed = true; 2232 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2233 return; 2234 } 2235 2236 if (ack) 2237 ieee80211_sta_reset_conn_monitor(sdata); 2238 } 2239 2240 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2241 { 2242 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2243 const u8 *ssid; 2244 u8 *dst = ifmgd->associated->bssid; 2245 u8 unicast_limit = max(1, max_probe_tries - 3); 2246 2247 /* 2248 * Try sending broadcast probe requests for the last three 2249 * probe requests after the first ones failed since some 2250 * buggy APs only support broadcast probe requests. 2251 */ 2252 if (ifmgd->probe_send_count >= unicast_limit) 2253 dst = NULL; 2254 2255 /* 2256 * When the hardware reports an accurate Tx ACK status, it's 2257 * better to send a nullfunc frame instead of a probe request, 2258 * as it will kick us off the AP quickly if we aren't associated 2259 * anymore. The timeout will be reset if the frame is ACKed by 2260 * the AP. 2261 */ 2262 ifmgd->probe_send_count++; 2263 2264 if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { 2265 ifmgd->nullfunc_failed = false; 2266 ieee80211_send_nullfunc(sdata->local, sdata, false); 2267 } else { 2268 int ssid_len; 2269 2270 rcu_read_lock(); 2271 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2272 if (WARN_ON_ONCE(ssid == NULL)) 2273 ssid_len = 0; 2274 else 2275 ssid_len = ssid[1]; 2276 2277 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst, 2278 ssid + 2, ssid_len, NULL, 2279 0, (u32) -1, true, 0, 2280 ifmgd->associated->channel, false); 2281 rcu_read_unlock(); 2282 } 2283 2284 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2285 run_again(sdata, ifmgd->probe_timeout); 2286 } 2287 2288 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2289 bool beacon) 2290 { 2291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2292 bool already = false; 2293 2294 if (!ieee80211_sdata_running(sdata)) 2295 return; 2296 2297 sdata_lock(sdata); 2298 2299 if (!ifmgd->associated) 2300 goto out; 2301 2302 mutex_lock(&sdata->local->mtx); 2303 2304 if (sdata->local->tmp_channel || sdata->local->scanning) { 2305 mutex_unlock(&sdata->local->mtx); 2306 goto out; 2307 } 2308 2309 if (beacon) { 2310 mlme_dbg_ratelimited(sdata, 2311 "detected beacon loss from AP (missed %d beacons) - probing\n", 2312 beacon_loss_count); 2313 2314 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2315 } 2316 2317 /* 2318 * The driver/our work has already reported this event or the 2319 * connection monitoring has kicked in and we have already sent 2320 * a probe request. Or maybe the AP died and the driver keeps 2321 * reporting until we disassociate... 2322 * 2323 * In either case we have to ignore the current call to this 2324 * function (except for setting the correct probe reason bit) 2325 * because otherwise we would reset the timer every time and 2326 * never check whether we received a probe response! 2327 */ 2328 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2329 already = true; 2330 2331 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2332 2333 mutex_unlock(&sdata->local->mtx); 2334 2335 if (already) 2336 goto out; 2337 2338 mutex_lock(&sdata->local->iflist_mtx); 2339 ieee80211_recalc_ps(sdata->local); 2340 mutex_unlock(&sdata->local->iflist_mtx); 2341 2342 ifmgd->probe_send_count = 0; 2343 ieee80211_mgd_probe_ap_send(sdata); 2344 out: 2345 sdata_unlock(sdata); 2346 } 2347 2348 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2349 struct ieee80211_vif *vif) 2350 { 2351 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2352 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2353 struct cfg80211_bss *cbss; 2354 struct sk_buff *skb; 2355 const u8 *ssid; 2356 int ssid_len; 2357 2358 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2359 return NULL; 2360 2361 sdata_assert_lock(sdata); 2362 2363 if (ifmgd->associated) 2364 cbss = ifmgd->associated; 2365 else if (ifmgd->auth_data) 2366 cbss = ifmgd->auth_data->bss; 2367 else if (ifmgd->assoc_data) 2368 cbss = ifmgd->assoc_data->bss; 2369 else 2370 return NULL; 2371 2372 rcu_read_lock(); 2373 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2374 if (WARN_ON_ONCE(ssid == NULL)) 2375 ssid_len = 0; 2376 else 2377 ssid_len = ssid[1]; 2378 2379 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2380 (u32) -1, cbss->channel, 2381 ssid + 2, ssid_len, 2382 NULL, 0, true); 2383 rcu_read_unlock(); 2384 2385 return skb; 2386 } 2387 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2388 2389 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata, 2390 const u8 *buf, size_t len, bool tx, 2391 u16 reason) 2392 { 2393 struct ieee80211_event event = { 2394 .type = MLME_EVENT, 2395 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT, 2396 .u.mlme.reason = reason, 2397 }; 2398 2399 if (tx) 2400 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len); 2401 else 2402 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len); 2403 2404 drv_event_callback(sdata->local, sdata, &event); 2405 } 2406 2407 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2408 { 2409 struct ieee80211_local *local = sdata->local; 2410 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2411 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2412 2413 sdata_lock(sdata); 2414 if (!ifmgd->associated) { 2415 sdata_unlock(sdata); 2416 return; 2417 } 2418 2419 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2420 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2421 true, frame_buf); 2422 mutex_lock(&local->mtx); 2423 sdata->vif.csa_active = false; 2424 ifmgd->csa_waiting_bcn = false; 2425 if (sdata->csa_block_tx) { 2426 ieee80211_wake_vif_queues(local, sdata, 2427 IEEE80211_QUEUE_STOP_REASON_CSA); 2428 sdata->csa_block_tx = false; 2429 } 2430 mutex_unlock(&local->mtx); 2431 2432 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 2433 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); 2434 2435 sdata_unlock(sdata); 2436 } 2437 2438 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2439 { 2440 struct ieee80211_sub_if_data *sdata = 2441 container_of(work, struct ieee80211_sub_if_data, 2442 u.mgd.beacon_connection_loss_work); 2443 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2444 2445 if (ifmgd->associated) 2446 ifmgd->beacon_loss_count++; 2447 2448 if (ifmgd->connection_loss) { 2449 sdata_info(sdata, "Connection to AP %pM lost\n", 2450 ifmgd->bssid); 2451 __ieee80211_disconnect(sdata); 2452 } else { 2453 ieee80211_mgd_probe_ap(sdata, true); 2454 } 2455 } 2456 2457 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2458 { 2459 struct ieee80211_sub_if_data *sdata = 2460 container_of(work, struct ieee80211_sub_if_data, 2461 u.mgd.csa_connection_drop_work); 2462 2463 __ieee80211_disconnect(sdata); 2464 } 2465 2466 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2467 { 2468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2469 struct ieee80211_hw *hw = &sdata->local->hw; 2470 2471 trace_api_beacon_loss(sdata); 2472 2473 sdata->u.mgd.connection_loss = false; 2474 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2475 } 2476 EXPORT_SYMBOL(ieee80211_beacon_loss); 2477 2478 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2479 { 2480 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2481 struct ieee80211_hw *hw = &sdata->local->hw; 2482 2483 trace_api_connection_loss(sdata); 2484 2485 sdata->u.mgd.connection_loss = true; 2486 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2487 } 2488 EXPORT_SYMBOL(ieee80211_connection_loss); 2489 2490 2491 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2492 bool assoc) 2493 { 2494 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2495 2496 sdata_assert_lock(sdata); 2497 2498 if (!assoc) { 2499 /* 2500 * we are not authenticated yet, the only timer that could be 2501 * running is the timeout for the authentication response which 2502 * which is not relevant anymore. 2503 */ 2504 del_timer_sync(&sdata->u.mgd.timer); 2505 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2506 2507 eth_zero_addr(sdata->u.mgd.bssid); 2508 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2509 sdata->u.mgd.flags = 0; 2510 mutex_lock(&sdata->local->mtx); 2511 ieee80211_vif_release_channel(sdata); 2512 mutex_unlock(&sdata->local->mtx); 2513 } 2514 2515 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2516 kfree(auth_data); 2517 sdata->u.mgd.auth_data = NULL; 2518 } 2519 2520 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2521 bool assoc) 2522 { 2523 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2524 2525 sdata_assert_lock(sdata); 2526 2527 if (!assoc) { 2528 /* 2529 * we are not associated yet, the only timer that could be 2530 * running is the timeout for the association response which 2531 * which is not relevant anymore. 2532 */ 2533 del_timer_sync(&sdata->u.mgd.timer); 2534 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2535 2536 eth_zero_addr(sdata->u.mgd.bssid); 2537 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2538 sdata->u.mgd.flags = 0; 2539 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER; 2540 mutex_lock(&sdata->local->mtx); 2541 ieee80211_vif_release_channel(sdata); 2542 mutex_unlock(&sdata->local->mtx); 2543 } 2544 2545 kfree(assoc_data); 2546 sdata->u.mgd.assoc_data = NULL; 2547 } 2548 2549 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2550 struct ieee80211_mgmt *mgmt, size_t len) 2551 { 2552 struct ieee80211_local *local = sdata->local; 2553 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2554 u8 *pos; 2555 struct ieee802_11_elems elems; 2556 u32 tx_flags = 0; 2557 2558 pos = mgmt->u.auth.variable; 2559 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2560 if (!elems.challenge) 2561 return; 2562 auth_data->expected_transaction = 4; 2563 drv_mgd_prepare_tx(sdata->local, sdata); 2564 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 2565 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2566 IEEE80211_TX_INTFL_MLME_CONN_TX; 2567 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2568 elems.challenge - 2, elems.challenge_len + 2, 2569 auth_data->bss->bssid, auth_data->bss->bssid, 2570 auth_data->key, auth_data->key_len, 2571 auth_data->key_idx, tx_flags); 2572 } 2573 2574 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2575 struct ieee80211_mgmt *mgmt, size_t len) 2576 { 2577 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2578 u8 bssid[ETH_ALEN]; 2579 u16 auth_alg, auth_transaction, status_code; 2580 struct sta_info *sta; 2581 struct ieee80211_event event = { 2582 .type = MLME_EVENT, 2583 .u.mlme.data = AUTH_EVENT, 2584 }; 2585 2586 sdata_assert_lock(sdata); 2587 2588 if (len < 24 + 6) 2589 return; 2590 2591 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2592 return; 2593 2594 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2595 2596 if (!ether_addr_equal(bssid, mgmt->bssid)) 2597 return; 2598 2599 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2600 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2601 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2602 2603 if (auth_alg != ifmgd->auth_data->algorithm || 2604 auth_transaction != ifmgd->auth_data->expected_transaction) { 2605 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2606 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2607 auth_transaction, 2608 ifmgd->auth_data->expected_transaction); 2609 return; 2610 } 2611 2612 if (status_code != WLAN_STATUS_SUCCESS) { 2613 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2614 mgmt->sa, status_code); 2615 ieee80211_destroy_auth_data(sdata, false); 2616 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2617 event.u.mlme.status = MLME_DENIED; 2618 event.u.mlme.reason = status_code; 2619 drv_event_callback(sdata->local, sdata, &event); 2620 return; 2621 } 2622 2623 switch (ifmgd->auth_data->algorithm) { 2624 case WLAN_AUTH_OPEN: 2625 case WLAN_AUTH_LEAP: 2626 case WLAN_AUTH_FT: 2627 case WLAN_AUTH_SAE: 2628 break; 2629 case WLAN_AUTH_SHARED_KEY: 2630 if (ifmgd->auth_data->expected_transaction != 4) { 2631 ieee80211_auth_challenge(sdata, mgmt, len); 2632 /* need another frame */ 2633 return; 2634 } 2635 break; 2636 default: 2637 WARN_ONCE(1, "invalid auth alg %d", 2638 ifmgd->auth_data->algorithm); 2639 return; 2640 } 2641 2642 event.u.mlme.status = MLME_SUCCESS; 2643 drv_event_callback(sdata->local, sdata, &event); 2644 sdata_info(sdata, "authenticated\n"); 2645 ifmgd->auth_data->done = true; 2646 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2647 ifmgd->auth_data->timeout_started = true; 2648 run_again(sdata, ifmgd->auth_data->timeout); 2649 2650 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2651 ifmgd->auth_data->expected_transaction != 2) { 2652 /* 2653 * Report auth frame to user space for processing since another 2654 * round of Authentication frames is still needed. 2655 */ 2656 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2657 return; 2658 } 2659 2660 /* move station state to auth */ 2661 mutex_lock(&sdata->local->sta_mtx); 2662 sta = sta_info_get(sdata, bssid); 2663 if (!sta) { 2664 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2665 goto out_err; 2666 } 2667 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2668 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2669 goto out_err; 2670 } 2671 mutex_unlock(&sdata->local->sta_mtx); 2672 2673 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2674 return; 2675 out_err: 2676 mutex_unlock(&sdata->local->sta_mtx); 2677 /* ignore frame -- wait for timeout */ 2678 } 2679 2680 #define case_WLAN(type) \ 2681 case WLAN_REASON_##type: return #type 2682 2683 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2684 { 2685 switch (reason_code) { 2686 case_WLAN(UNSPECIFIED); 2687 case_WLAN(PREV_AUTH_NOT_VALID); 2688 case_WLAN(DEAUTH_LEAVING); 2689 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2690 case_WLAN(DISASSOC_AP_BUSY); 2691 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2692 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2693 case_WLAN(DISASSOC_STA_HAS_LEFT); 2694 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2695 case_WLAN(DISASSOC_BAD_POWER); 2696 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2697 case_WLAN(INVALID_IE); 2698 case_WLAN(MIC_FAILURE); 2699 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2700 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2701 case_WLAN(IE_DIFFERENT); 2702 case_WLAN(INVALID_GROUP_CIPHER); 2703 case_WLAN(INVALID_PAIRWISE_CIPHER); 2704 case_WLAN(INVALID_AKMP); 2705 case_WLAN(UNSUPP_RSN_VERSION); 2706 case_WLAN(INVALID_RSN_IE_CAP); 2707 case_WLAN(IEEE8021X_FAILED); 2708 case_WLAN(CIPHER_SUITE_REJECTED); 2709 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2710 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2711 case_WLAN(DISASSOC_LOW_ACK); 2712 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2713 case_WLAN(QSTA_LEAVE_QBSS); 2714 case_WLAN(QSTA_NOT_USE); 2715 case_WLAN(QSTA_REQUIRE_SETUP); 2716 case_WLAN(QSTA_TIMEOUT); 2717 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2718 case_WLAN(MESH_PEER_CANCELED); 2719 case_WLAN(MESH_MAX_PEERS); 2720 case_WLAN(MESH_CONFIG); 2721 case_WLAN(MESH_CLOSE); 2722 case_WLAN(MESH_MAX_RETRIES); 2723 case_WLAN(MESH_CONFIRM_TIMEOUT); 2724 case_WLAN(MESH_INVALID_GTK); 2725 case_WLAN(MESH_INCONSISTENT_PARAM); 2726 case_WLAN(MESH_INVALID_SECURITY); 2727 case_WLAN(MESH_PATH_ERROR); 2728 case_WLAN(MESH_PATH_NOFORWARD); 2729 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2730 case_WLAN(MAC_EXISTS_IN_MBSS); 2731 case_WLAN(MESH_CHAN_REGULATORY); 2732 case_WLAN(MESH_CHAN); 2733 default: return "<unknown>"; 2734 } 2735 } 2736 2737 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2738 struct ieee80211_mgmt *mgmt, size_t len) 2739 { 2740 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2741 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2742 2743 sdata_assert_lock(sdata); 2744 2745 if (len < 24 + 2) 2746 return; 2747 2748 if (ifmgd->associated && 2749 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { 2750 const u8 *bssid = ifmgd->associated->bssid; 2751 2752 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2753 bssid, reason_code, 2754 ieee80211_get_reason_code_string(reason_code)); 2755 2756 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2757 2758 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, 2759 reason_code); 2760 return; 2761 } 2762 2763 if (ifmgd->assoc_data && 2764 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2765 const u8 *bssid = ifmgd->assoc_data->bss->bssid; 2766 2767 sdata_info(sdata, 2768 "deauthenticated from %pM while associating (Reason: %u=%s)\n", 2769 bssid, reason_code, 2770 ieee80211_get_reason_code_string(reason_code)); 2771 2772 ieee80211_destroy_assoc_data(sdata, false); 2773 2774 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2775 return; 2776 } 2777 } 2778 2779 2780 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2781 struct ieee80211_mgmt *mgmt, size_t len) 2782 { 2783 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2784 u16 reason_code; 2785 2786 sdata_assert_lock(sdata); 2787 2788 if (len < 24 + 2) 2789 return; 2790 2791 if (!ifmgd->associated || 2792 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2793 return; 2794 2795 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2796 2797 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2798 mgmt->sa, reason_code); 2799 2800 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2801 2802 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code); 2803 } 2804 2805 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2806 u8 *supp_rates, unsigned int supp_rates_len, 2807 u32 *rates, u32 *basic_rates, 2808 bool *have_higher_than_11mbit, 2809 int *min_rate, int *min_rate_index, 2810 int shift, u32 rate_flags) 2811 { 2812 int i, j; 2813 2814 for (i = 0; i < supp_rates_len; i++) { 2815 int rate = supp_rates[i] & 0x7f; 2816 bool is_basic = !!(supp_rates[i] & 0x80); 2817 2818 if ((rate * 5 * (1 << shift)) > 110) 2819 *have_higher_than_11mbit = true; 2820 2821 /* 2822 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2823 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2824 * 2825 * Note: Even through the membership selector and the basic 2826 * rate flag share the same bit, they are not exactly 2827 * the same. 2828 */ 2829 if (!!(supp_rates[i] & 0x80) && 2830 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2831 continue; 2832 2833 for (j = 0; j < sband->n_bitrates; j++) { 2834 struct ieee80211_rate *br; 2835 int brate; 2836 2837 br = &sband->bitrates[j]; 2838 if ((rate_flags & br->flags) != rate_flags) 2839 continue; 2840 2841 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2842 if (brate == rate) { 2843 *rates |= BIT(j); 2844 if (is_basic) 2845 *basic_rates |= BIT(j); 2846 if ((rate * 5) < *min_rate) { 2847 *min_rate = rate * 5; 2848 *min_rate_index = j; 2849 } 2850 break; 2851 } 2852 } 2853 } 2854 } 2855 2856 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2857 struct cfg80211_bss *cbss, 2858 struct ieee80211_mgmt *mgmt, size_t len) 2859 { 2860 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2861 struct ieee80211_local *local = sdata->local; 2862 struct ieee80211_supported_band *sband; 2863 struct sta_info *sta; 2864 u8 *pos; 2865 u16 capab_info, aid; 2866 struct ieee802_11_elems elems; 2867 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2868 const struct cfg80211_bss_ies *bss_ies = NULL; 2869 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2870 u32 changed = 0; 2871 int err; 2872 bool ret; 2873 2874 /* AssocResp and ReassocResp have identical structure */ 2875 2876 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2877 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2878 2879 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2880 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2881 aid); 2882 aid &= ~(BIT(15) | BIT(14)); 2883 2884 ifmgd->broken_ap = false; 2885 2886 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2887 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2888 aid); 2889 aid = 0; 2890 ifmgd->broken_ap = true; 2891 } 2892 2893 pos = mgmt->u.assoc_resp.variable; 2894 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2895 2896 if (!elems.supp_rates) { 2897 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2898 return false; 2899 } 2900 2901 ifmgd->aid = aid; 2902 ifmgd->tdls_chan_switch_prohibited = 2903 elems.ext_capab && elems.ext_capab_len >= 5 && 2904 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2905 2906 /* 2907 * Some APs are erroneously not including some information in their 2908 * (re)association response frames. Try to recover by using the data 2909 * from the beacon or probe response. This seems to afflict mobile 2910 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2911 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2912 */ 2913 if ((assoc_data->wmm && !elems.wmm_param) || 2914 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2915 (!elems.ht_cap_elem || !elems.ht_operation)) || 2916 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2917 (!elems.vht_cap_elem || !elems.vht_operation))) { 2918 const struct cfg80211_bss_ies *ies; 2919 struct ieee802_11_elems bss_elems; 2920 2921 rcu_read_lock(); 2922 ies = rcu_dereference(cbss->ies); 2923 if (ies) 2924 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2925 GFP_ATOMIC); 2926 rcu_read_unlock(); 2927 if (!bss_ies) 2928 return false; 2929 2930 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2931 false, &bss_elems); 2932 if (assoc_data->wmm && 2933 !elems.wmm_param && bss_elems.wmm_param) { 2934 elems.wmm_param = bss_elems.wmm_param; 2935 sdata_info(sdata, 2936 "AP bug: WMM param missing from AssocResp\n"); 2937 } 2938 2939 /* 2940 * Also check if we requested HT/VHT, otherwise the AP doesn't 2941 * have to include the IEs in the (re)association response. 2942 */ 2943 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2944 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2945 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2946 sdata_info(sdata, 2947 "AP bug: HT capability missing from AssocResp\n"); 2948 } 2949 if (!elems.ht_operation && bss_elems.ht_operation && 2950 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2951 elems.ht_operation = bss_elems.ht_operation; 2952 sdata_info(sdata, 2953 "AP bug: HT operation missing from AssocResp\n"); 2954 } 2955 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2956 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2957 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2958 sdata_info(sdata, 2959 "AP bug: VHT capa missing from AssocResp\n"); 2960 } 2961 if (!elems.vht_operation && bss_elems.vht_operation && 2962 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2963 elems.vht_operation = bss_elems.vht_operation; 2964 sdata_info(sdata, 2965 "AP bug: VHT operation missing from AssocResp\n"); 2966 } 2967 } 2968 2969 /* 2970 * We previously checked these in the beacon/probe response, so 2971 * they should be present here. This is just a safety net. 2972 */ 2973 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2974 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2975 sdata_info(sdata, 2976 "HT AP is missing WMM params or HT capability/operation\n"); 2977 ret = false; 2978 goto out; 2979 } 2980 2981 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2982 (!elems.vht_cap_elem || !elems.vht_operation)) { 2983 sdata_info(sdata, 2984 "VHT AP is missing VHT capability/operation\n"); 2985 ret = false; 2986 goto out; 2987 } 2988 2989 mutex_lock(&sdata->local->sta_mtx); 2990 /* 2991 * station info was already allocated and inserted before 2992 * the association and should be available to us 2993 */ 2994 sta = sta_info_get(sdata, cbss->bssid); 2995 if (WARN_ON(!sta)) { 2996 mutex_unlock(&sdata->local->sta_mtx); 2997 ret = false; 2998 goto out; 2999 } 3000 3001 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 3002 3003 /* Set up internal HT/VHT capabilities */ 3004 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 3005 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 3006 elems.ht_cap_elem, sta); 3007 3008 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 3009 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 3010 elems.vht_cap_elem, sta); 3011 3012 /* 3013 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 3014 * in their association response, so ignore that data for our own 3015 * configuration. If it changed since the last beacon, we'll get the 3016 * next beacon and update then. 3017 */ 3018 3019 /* 3020 * If an operating mode notification IE is present, override the 3021 * NSS calculation (that would be done in rate_control_rate_init()) 3022 * and use the # of streams from that element. 3023 */ 3024 if (elems.opmode_notif && 3025 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 3026 u8 nss; 3027 3028 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 3029 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 3030 nss += 1; 3031 sta->sta.rx_nss = nss; 3032 } 3033 3034 rate_control_rate_init(sta); 3035 3036 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) { 3037 set_sta_flag(sta, WLAN_STA_MFP); 3038 sta->sta.mfp = true; 3039 } else { 3040 sta->sta.mfp = false; 3041 } 3042 3043 sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS; 3044 3045 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 3046 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 3047 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 3048 if (err) { 3049 sdata_info(sdata, 3050 "failed to move station %pM to desired state\n", 3051 sta->sta.addr); 3052 WARN_ON(__sta_info_destroy(sta)); 3053 mutex_unlock(&sdata->local->sta_mtx); 3054 ret = false; 3055 goto out; 3056 } 3057 3058 mutex_unlock(&sdata->local->sta_mtx); 3059 3060 /* 3061 * Always handle WMM once after association regardless 3062 * of the first value the AP uses. Setting -1 here has 3063 * that effect because the AP values is an unsigned 3064 * 4-bit value. 3065 */ 3066 ifmgd->wmm_last_param_set = -1; 3067 3068 if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 3069 ieee80211_set_wmm_default(sdata, false, false); 3070 } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3071 elems.wmm_param_len)) { 3072 /* still enable QoS since we might have HT/VHT */ 3073 ieee80211_set_wmm_default(sdata, false, true); 3074 /* set the disable-WMM flag in this case to disable 3075 * tracking WMM parameter changes in the beacon if 3076 * the parameters weren't actually valid. Doing so 3077 * avoids changing parameters very strangely when 3078 * the AP is going back and forth between valid and 3079 * invalid parameters. 3080 */ 3081 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 3082 } 3083 changed |= BSS_CHANGED_QOS; 3084 3085 /* set AID and assoc capability, 3086 * ieee80211_set_associated() will tell the driver */ 3087 bss_conf->aid = aid; 3088 bss_conf->assoc_capability = capab_info; 3089 ieee80211_set_associated(sdata, cbss, changed); 3090 3091 /* 3092 * If we're using 4-addr mode, let the AP know that we're 3093 * doing so, so that it can create the STA VLAN on its side 3094 */ 3095 if (ifmgd->use_4addr) 3096 ieee80211_send_4addr_nullfunc(local, sdata); 3097 3098 /* 3099 * Start timer to probe the connection to the AP now. 3100 * Also start the timer that will detect beacon loss. 3101 */ 3102 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3103 ieee80211_sta_reset_beacon_monitor(sdata); 3104 3105 ret = true; 3106 out: 3107 kfree(bss_ies); 3108 return ret; 3109 } 3110 3111 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3112 struct ieee80211_mgmt *mgmt, 3113 size_t len) 3114 { 3115 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3116 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3117 u16 capab_info, status_code, aid; 3118 struct ieee802_11_elems elems; 3119 int ac, uapsd_queues = -1; 3120 u8 *pos; 3121 bool reassoc; 3122 struct cfg80211_bss *bss; 3123 struct ieee80211_event event = { 3124 .type = MLME_EVENT, 3125 .u.mlme.data = ASSOC_EVENT, 3126 }; 3127 3128 sdata_assert_lock(sdata); 3129 3130 if (!assoc_data) 3131 return; 3132 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3133 return; 3134 3135 /* 3136 * AssocResp and ReassocResp have identical structure, so process both 3137 * of them in this function. 3138 */ 3139 3140 if (len < 24 + 6) 3141 return; 3142 3143 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3144 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3145 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3146 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3147 3148 sdata_info(sdata, 3149 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3150 reassoc ? "Rea" : "A", mgmt->sa, 3151 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3152 3153 pos = mgmt->u.assoc_resp.variable; 3154 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3155 3156 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3157 elems.timeout_int && 3158 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3159 u32 tu, ms; 3160 tu = le32_to_cpu(elems.timeout_int->value); 3161 ms = tu * 1024 / 1000; 3162 sdata_info(sdata, 3163 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3164 mgmt->sa, tu, ms); 3165 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3166 assoc_data->timeout_started = true; 3167 if (ms > IEEE80211_ASSOC_TIMEOUT) 3168 run_again(sdata, assoc_data->timeout); 3169 return; 3170 } 3171 3172 bss = assoc_data->bss; 3173 3174 if (status_code != WLAN_STATUS_SUCCESS) { 3175 sdata_info(sdata, "%pM denied association (code=%d)\n", 3176 mgmt->sa, status_code); 3177 ieee80211_destroy_assoc_data(sdata, false); 3178 event.u.mlme.status = MLME_DENIED; 3179 event.u.mlme.reason = status_code; 3180 drv_event_callback(sdata->local, sdata, &event); 3181 } else { 3182 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3183 /* oops -- internal error -- send timeout for now */ 3184 ieee80211_destroy_assoc_data(sdata, false); 3185 cfg80211_assoc_timeout(sdata->dev, bss); 3186 return; 3187 } 3188 event.u.mlme.status = MLME_SUCCESS; 3189 drv_event_callback(sdata->local, sdata, &event); 3190 sdata_info(sdata, "associated\n"); 3191 3192 /* 3193 * destroy assoc_data afterwards, as otherwise an idle 3194 * recalc after assoc_data is NULL but before associated 3195 * is set can cause the interface to go idle 3196 */ 3197 ieee80211_destroy_assoc_data(sdata, true); 3198 3199 /* get uapsd queues configuration */ 3200 uapsd_queues = 0; 3201 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3202 if (sdata->tx_conf[ac].uapsd) 3203 uapsd_queues |= BIT(ac); 3204 } 3205 3206 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3207 } 3208 3209 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3210 struct ieee80211_mgmt *mgmt, size_t len, 3211 struct ieee80211_rx_status *rx_status, 3212 struct ieee802_11_elems *elems) 3213 { 3214 struct ieee80211_local *local = sdata->local; 3215 struct ieee80211_bss *bss; 3216 struct ieee80211_channel *channel; 3217 3218 sdata_assert_lock(sdata); 3219 3220 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3221 if (!channel) 3222 return; 3223 3224 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3225 channel); 3226 if (bss) { 3227 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3228 ieee80211_rx_bss_put(local, bss); 3229 } 3230 } 3231 3232 3233 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3234 struct sk_buff *skb) 3235 { 3236 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3237 struct ieee80211_if_managed *ifmgd; 3238 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3239 size_t baselen, len = skb->len; 3240 struct ieee802_11_elems elems; 3241 3242 ifmgd = &sdata->u.mgd; 3243 3244 sdata_assert_lock(sdata); 3245 3246 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3247 return; /* ignore ProbeResp to foreign address */ 3248 3249 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3250 if (baselen > len) 3251 return; 3252 3253 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3254 false, &elems); 3255 3256 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3257 3258 if (ifmgd->associated && 3259 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3260 ieee80211_reset_ap_probe(sdata); 3261 } 3262 3263 /* 3264 * This is the canonical list of information elements we care about, 3265 * the filter code also gives us all changes to the Microsoft OUI 3266 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3267 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3268 * changes to requested client power. 3269 * 3270 * We implement beacon filtering in software since that means we can 3271 * avoid processing the frame here and in cfg80211, and userspace 3272 * will not be able to tell whether the hardware supports it or not. 3273 * 3274 * XXX: This list needs to be dynamic -- userspace needs to be able to 3275 * add items it requires. It also needs to be able to tell us to 3276 * look out for other vendor IEs. 3277 */ 3278 static const u64 care_about_ies = 3279 (1ULL << WLAN_EID_COUNTRY) | 3280 (1ULL << WLAN_EID_ERP_INFO) | 3281 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3282 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3283 (1ULL << WLAN_EID_HT_CAPABILITY) | 3284 (1ULL << WLAN_EID_HT_OPERATION) | 3285 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3286 3287 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3288 struct ieee80211_mgmt *mgmt, size_t len, 3289 struct ieee80211_rx_status *rx_status) 3290 { 3291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3292 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3293 size_t baselen; 3294 struct ieee802_11_elems elems; 3295 struct ieee80211_local *local = sdata->local; 3296 struct ieee80211_chanctx_conf *chanctx_conf; 3297 struct ieee80211_channel *chan; 3298 struct sta_info *sta; 3299 u32 changed = 0; 3300 bool erp_valid; 3301 u8 erp_value = 0; 3302 u32 ncrc; 3303 u8 *bssid; 3304 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3305 3306 sdata_assert_lock(sdata); 3307 3308 /* Process beacon from the current BSS */ 3309 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3310 if (baselen > len) 3311 return; 3312 3313 rcu_read_lock(); 3314 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3315 if (!chanctx_conf) { 3316 rcu_read_unlock(); 3317 return; 3318 } 3319 3320 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3321 rcu_read_unlock(); 3322 return; 3323 } 3324 chan = chanctx_conf->def.chan; 3325 rcu_read_unlock(); 3326 3327 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3328 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3329 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3330 len - baselen, false, &elems); 3331 3332 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3333 if (elems.tim && !elems.parse_error) { 3334 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3335 ifmgd->dtim_period = tim_ie->dtim_period; 3336 } 3337 ifmgd->have_beacon = true; 3338 ifmgd->assoc_data->need_beacon = false; 3339 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3340 sdata->vif.bss_conf.sync_tsf = 3341 le64_to_cpu(mgmt->u.beacon.timestamp); 3342 sdata->vif.bss_conf.sync_device_ts = 3343 rx_status->device_timestamp; 3344 if (elems.tim) 3345 sdata->vif.bss_conf.sync_dtim_count = 3346 elems.tim->dtim_count; 3347 else 3348 sdata->vif.bss_conf.sync_dtim_count = 0; 3349 } 3350 /* continue assoc process */ 3351 ifmgd->assoc_data->timeout = jiffies; 3352 ifmgd->assoc_data->timeout_started = true; 3353 run_again(sdata, ifmgd->assoc_data->timeout); 3354 return; 3355 } 3356 3357 if (!ifmgd->associated || 3358 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3359 return; 3360 bssid = ifmgd->associated->bssid; 3361 3362 /* Track average RSSI from the Beacon frames of the current AP */ 3363 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3364 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3365 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal); 3366 ifmgd->last_cqm_event_signal = 0; 3367 ifmgd->count_beacon_signal = 1; 3368 ifmgd->last_ave_beacon_signal = 0; 3369 } else { 3370 ifmgd->count_beacon_signal++; 3371 } 3372 3373 ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal); 3374 3375 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3376 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3377 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3378 int last_sig = ifmgd->last_ave_beacon_signal; 3379 struct ieee80211_event event = { 3380 .type = RSSI_EVENT, 3381 }; 3382 3383 /* 3384 * if signal crosses either of the boundaries, invoke callback 3385 * with appropriate parameters 3386 */ 3387 if (sig > ifmgd->rssi_max_thold && 3388 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3389 ifmgd->last_ave_beacon_signal = sig; 3390 event.u.rssi.data = RSSI_EVENT_HIGH; 3391 drv_event_callback(local, sdata, &event); 3392 } else if (sig < ifmgd->rssi_min_thold && 3393 (last_sig >= ifmgd->rssi_max_thold || 3394 last_sig == 0)) { 3395 ifmgd->last_ave_beacon_signal = sig; 3396 event.u.rssi.data = RSSI_EVENT_LOW; 3397 drv_event_callback(local, sdata, &event); 3398 } 3399 } 3400 3401 if (bss_conf->cqm_rssi_thold && 3402 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3403 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3404 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal); 3405 int last_event = ifmgd->last_cqm_event_signal; 3406 int thold = bss_conf->cqm_rssi_thold; 3407 int hyst = bss_conf->cqm_rssi_hyst; 3408 3409 if (sig < thold && 3410 (last_event == 0 || sig < last_event - hyst)) { 3411 ifmgd->last_cqm_event_signal = sig; 3412 ieee80211_cqm_rssi_notify( 3413 &sdata->vif, 3414 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3415 GFP_KERNEL); 3416 } else if (sig > thold && 3417 (last_event == 0 || sig > last_event + hyst)) { 3418 ifmgd->last_cqm_event_signal = sig; 3419 ieee80211_cqm_rssi_notify( 3420 &sdata->vif, 3421 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3422 GFP_KERNEL); 3423 } 3424 } 3425 3426 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3427 mlme_dbg_ratelimited(sdata, 3428 "cancelling AP probe due to a received beacon\n"); 3429 ieee80211_reset_ap_probe(sdata); 3430 } 3431 3432 /* 3433 * Push the beacon loss detection into the future since 3434 * we are processing a beacon from the AP just now. 3435 */ 3436 ieee80211_sta_reset_beacon_monitor(sdata); 3437 3438 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3439 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3440 len - baselen, false, &elems, 3441 care_about_ies, ncrc); 3442 3443 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) && 3444 ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) { 3445 if (local->hw.conf.dynamic_ps_timeout > 0) { 3446 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3447 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3448 ieee80211_hw_config(local, 3449 IEEE80211_CONF_CHANGE_PS); 3450 } 3451 ieee80211_send_nullfunc(local, sdata, false); 3452 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3453 local->pspolling = true; 3454 3455 /* 3456 * Here is assumed that the driver will be 3457 * able to send ps-poll frame and receive a 3458 * response even though power save mode is 3459 * enabled, but some drivers might require 3460 * to disable power save here. This needs 3461 * to be investigated. 3462 */ 3463 ieee80211_send_pspoll(local, sdata); 3464 } 3465 } 3466 3467 if (sdata->vif.p2p || 3468 sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) { 3469 struct ieee80211_p2p_noa_attr noa = {}; 3470 int ret; 3471 3472 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3473 len - baselen, 3474 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3475 (u8 *) &noa, sizeof(noa)); 3476 if (ret >= 2) { 3477 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3478 /* valid noa_attr and index changed */ 3479 sdata->u.mgd.p2p_noa_index = noa.index; 3480 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3481 changed |= BSS_CHANGED_P2P_PS; 3482 /* 3483 * make sure we update all information, the CRC 3484 * mechanism doesn't look at P2P attributes. 3485 */ 3486 ifmgd->beacon_crc_valid = false; 3487 } 3488 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3489 /* noa_attr not found and we had valid noa_attr before */ 3490 sdata->u.mgd.p2p_noa_index = -1; 3491 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3492 changed |= BSS_CHANGED_P2P_PS; 3493 ifmgd->beacon_crc_valid = false; 3494 } 3495 } 3496 3497 if (ifmgd->csa_waiting_bcn) 3498 ieee80211_chswitch_post_beacon(sdata); 3499 3500 /* 3501 * Update beacon timing and dtim count on every beacon appearance. This 3502 * will allow the driver to use the most updated values. Do it before 3503 * comparing this one with last received beacon. 3504 * IMPORTANT: These parameters would possibly be out of sync by the time 3505 * the driver will use them. The synchronized view is currently 3506 * guaranteed only in certain callbacks. 3507 */ 3508 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 3509 sdata->vif.bss_conf.sync_tsf = 3510 le64_to_cpu(mgmt->u.beacon.timestamp); 3511 sdata->vif.bss_conf.sync_device_ts = 3512 rx_status->device_timestamp; 3513 if (elems.tim) 3514 sdata->vif.bss_conf.sync_dtim_count = 3515 elems.tim->dtim_count; 3516 else 3517 sdata->vif.bss_conf.sync_dtim_count = 0; 3518 } 3519 3520 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3521 return; 3522 ifmgd->beacon_crc = ncrc; 3523 ifmgd->beacon_crc_valid = true; 3524 3525 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3526 3527 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3528 rx_status->device_timestamp, 3529 &elems, true); 3530 3531 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3532 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3533 elems.wmm_param_len)) 3534 changed |= BSS_CHANGED_QOS; 3535 3536 /* 3537 * If we haven't had a beacon before, tell the driver about the 3538 * DTIM period (and beacon timing if desired) now. 3539 */ 3540 if (!ifmgd->have_beacon) { 3541 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3542 if (elems.tim) 3543 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3544 else 3545 bss_conf->dtim_period = 1; 3546 3547 changed |= BSS_CHANGED_BEACON_INFO; 3548 ifmgd->have_beacon = true; 3549 3550 mutex_lock(&local->iflist_mtx); 3551 ieee80211_recalc_ps(local); 3552 mutex_unlock(&local->iflist_mtx); 3553 3554 ieee80211_recalc_ps_vif(sdata); 3555 } 3556 3557 if (elems.erp_info) { 3558 erp_valid = true; 3559 erp_value = elems.erp_info[0]; 3560 } else { 3561 erp_valid = false; 3562 } 3563 changed |= ieee80211_handle_bss_capability(sdata, 3564 le16_to_cpu(mgmt->u.beacon.capab_info), 3565 erp_valid, erp_value); 3566 3567 mutex_lock(&local->sta_mtx); 3568 sta = sta_info_get(sdata, bssid); 3569 3570 if (ieee80211_config_bw(sdata, sta, 3571 elems.ht_cap_elem, elems.ht_operation, 3572 elems.vht_operation, bssid, &changed)) { 3573 mutex_unlock(&local->sta_mtx); 3574 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3575 WLAN_REASON_DEAUTH_LEAVING, 3576 true, deauth_buf); 3577 ieee80211_report_disconnect(sdata, deauth_buf, 3578 sizeof(deauth_buf), true, 3579 WLAN_REASON_DEAUTH_LEAVING); 3580 return; 3581 } 3582 3583 if (sta && elems.opmode_notif) 3584 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3585 rx_status->band); 3586 mutex_unlock(&local->sta_mtx); 3587 3588 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3589 elems.country_elem, 3590 elems.country_elem_len, 3591 elems.pwr_constr_elem, 3592 elems.cisco_dtpc_elem); 3593 3594 ieee80211_bss_info_change_notify(sdata, changed); 3595 } 3596 3597 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3598 struct sk_buff *skb) 3599 { 3600 struct ieee80211_rx_status *rx_status; 3601 struct ieee80211_mgmt *mgmt; 3602 u16 fc; 3603 struct ieee802_11_elems elems; 3604 int ies_len; 3605 3606 rx_status = (struct ieee80211_rx_status *) skb->cb; 3607 mgmt = (struct ieee80211_mgmt *) skb->data; 3608 fc = le16_to_cpu(mgmt->frame_control); 3609 3610 sdata_lock(sdata); 3611 3612 switch (fc & IEEE80211_FCTL_STYPE) { 3613 case IEEE80211_STYPE_BEACON: 3614 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3615 break; 3616 case IEEE80211_STYPE_PROBE_RESP: 3617 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3618 break; 3619 case IEEE80211_STYPE_AUTH: 3620 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3621 break; 3622 case IEEE80211_STYPE_DEAUTH: 3623 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3624 break; 3625 case IEEE80211_STYPE_DISASSOC: 3626 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3627 break; 3628 case IEEE80211_STYPE_ASSOC_RESP: 3629 case IEEE80211_STYPE_REASSOC_RESP: 3630 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3631 break; 3632 case IEEE80211_STYPE_ACTION: 3633 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3634 ies_len = skb->len - 3635 offsetof(struct ieee80211_mgmt, 3636 u.action.u.chan_switch.variable); 3637 3638 if (ies_len < 0) 3639 break; 3640 3641 ieee802_11_parse_elems( 3642 mgmt->u.action.u.chan_switch.variable, 3643 ies_len, true, &elems); 3644 3645 if (elems.parse_error) 3646 break; 3647 3648 ieee80211_sta_process_chanswitch(sdata, 3649 rx_status->mactime, 3650 rx_status->device_timestamp, 3651 &elems, false); 3652 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3653 ies_len = skb->len - 3654 offsetof(struct ieee80211_mgmt, 3655 u.action.u.ext_chan_switch.variable); 3656 3657 if (ies_len < 0) 3658 break; 3659 3660 ieee802_11_parse_elems( 3661 mgmt->u.action.u.ext_chan_switch.variable, 3662 ies_len, true, &elems); 3663 3664 if (elems.parse_error) 3665 break; 3666 3667 /* for the handling code pretend this was also an IE */ 3668 elems.ext_chansw_ie = 3669 &mgmt->u.action.u.ext_chan_switch.data; 3670 3671 ieee80211_sta_process_chanswitch(sdata, 3672 rx_status->mactime, 3673 rx_status->device_timestamp, 3674 &elems, false); 3675 } 3676 break; 3677 } 3678 sdata_unlock(sdata); 3679 } 3680 3681 static void ieee80211_sta_timer(unsigned long data) 3682 { 3683 struct ieee80211_sub_if_data *sdata = 3684 (struct ieee80211_sub_if_data *) data; 3685 3686 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3687 } 3688 3689 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3690 u8 *bssid, u8 reason, bool tx) 3691 { 3692 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3693 3694 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3695 tx, frame_buf); 3696 3697 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 3698 reason); 3699 } 3700 3701 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata) 3702 { 3703 struct ieee80211_local *local = sdata->local; 3704 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3705 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3706 u32 tx_flags = 0; 3707 u16 trans = 1; 3708 u16 status = 0; 3709 3710 sdata_assert_lock(sdata); 3711 3712 if (WARN_ON_ONCE(!auth_data)) 3713 return -EINVAL; 3714 3715 auth_data->tries++; 3716 3717 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3718 sdata_info(sdata, "authentication with %pM timed out\n", 3719 auth_data->bss->bssid); 3720 3721 /* 3722 * Most likely AP is not in the range so remove the 3723 * bss struct for that AP. 3724 */ 3725 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3726 3727 return -ETIMEDOUT; 3728 } 3729 3730 drv_mgd_prepare_tx(local, sdata); 3731 3732 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3733 auth_data->bss->bssid, auth_data->tries, 3734 IEEE80211_AUTH_MAX_TRIES); 3735 3736 auth_data->expected_transaction = 2; 3737 3738 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3739 trans = auth_data->sae_trans; 3740 status = auth_data->sae_status; 3741 auth_data->expected_transaction = trans; 3742 } 3743 3744 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3745 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3746 IEEE80211_TX_INTFL_MLME_CONN_TX; 3747 3748 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3749 auth_data->data, auth_data->data_len, 3750 auth_data->bss->bssid, 3751 auth_data->bss->bssid, NULL, 0, 0, 3752 tx_flags); 3753 3754 if (tx_flags == 0) { 3755 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3756 auth_data->timeout_started = true; 3757 run_again(sdata, auth_data->timeout); 3758 } else { 3759 auth_data->timeout = 3760 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3761 auth_data->timeout_started = true; 3762 run_again(sdata, auth_data->timeout); 3763 } 3764 3765 return 0; 3766 } 3767 3768 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3769 { 3770 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3771 struct ieee80211_local *local = sdata->local; 3772 3773 sdata_assert_lock(sdata); 3774 3775 assoc_data->tries++; 3776 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3777 sdata_info(sdata, "association with %pM timed out\n", 3778 assoc_data->bss->bssid); 3779 3780 /* 3781 * Most likely AP is not in the range so remove the 3782 * bss struct for that AP. 3783 */ 3784 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3785 3786 return -ETIMEDOUT; 3787 } 3788 3789 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3790 assoc_data->bss->bssid, assoc_data->tries, 3791 IEEE80211_ASSOC_MAX_TRIES); 3792 ieee80211_send_assoc(sdata); 3793 3794 if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3795 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3796 assoc_data->timeout_started = true; 3797 run_again(sdata, assoc_data->timeout); 3798 } else { 3799 assoc_data->timeout = 3800 round_jiffies_up(jiffies + 3801 IEEE80211_ASSOC_TIMEOUT_LONG); 3802 assoc_data->timeout_started = true; 3803 run_again(sdata, assoc_data->timeout); 3804 } 3805 3806 return 0; 3807 } 3808 3809 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3810 __le16 fc, bool acked) 3811 { 3812 struct ieee80211_local *local = sdata->local; 3813 3814 sdata->u.mgd.status_fc = fc; 3815 sdata->u.mgd.status_acked = acked; 3816 sdata->u.mgd.status_received = true; 3817 3818 ieee80211_queue_work(&local->hw, &sdata->work); 3819 } 3820 3821 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3822 { 3823 struct ieee80211_local *local = sdata->local; 3824 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3825 3826 sdata_lock(sdata); 3827 3828 if (ifmgd->status_received) { 3829 __le16 fc = ifmgd->status_fc; 3830 bool status_acked = ifmgd->status_acked; 3831 3832 ifmgd->status_received = false; 3833 if (ifmgd->auth_data && ieee80211_is_auth(fc)) { 3834 if (status_acked) { 3835 ifmgd->auth_data->timeout = 3836 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3837 run_again(sdata, ifmgd->auth_data->timeout); 3838 } else { 3839 ifmgd->auth_data->timeout = jiffies - 1; 3840 } 3841 ifmgd->auth_data->timeout_started = true; 3842 } else if (ifmgd->assoc_data && 3843 (ieee80211_is_assoc_req(fc) || 3844 ieee80211_is_reassoc_req(fc))) { 3845 if (status_acked) { 3846 ifmgd->assoc_data->timeout = 3847 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3848 run_again(sdata, ifmgd->assoc_data->timeout); 3849 } else { 3850 ifmgd->assoc_data->timeout = jiffies - 1; 3851 } 3852 ifmgd->assoc_data->timeout_started = true; 3853 } 3854 } 3855 3856 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3857 time_after(jiffies, ifmgd->auth_data->timeout)) { 3858 if (ifmgd->auth_data->done) { 3859 /* 3860 * ok ... we waited for assoc but userspace didn't, 3861 * so let's just kill the auth data 3862 */ 3863 ieee80211_destroy_auth_data(sdata, false); 3864 } else if (ieee80211_auth(sdata)) { 3865 u8 bssid[ETH_ALEN]; 3866 struct ieee80211_event event = { 3867 .type = MLME_EVENT, 3868 .u.mlme.data = AUTH_EVENT, 3869 .u.mlme.status = MLME_TIMEOUT, 3870 }; 3871 3872 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3873 3874 ieee80211_destroy_auth_data(sdata, false); 3875 3876 cfg80211_auth_timeout(sdata->dev, bssid); 3877 drv_event_callback(sdata->local, sdata, &event); 3878 } 3879 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3880 run_again(sdata, ifmgd->auth_data->timeout); 3881 3882 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3883 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3884 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3885 ieee80211_do_assoc(sdata)) { 3886 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3887 struct ieee80211_event event = { 3888 .type = MLME_EVENT, 3889 .u.mlme.data = ASSOC_EVENT, 3890 .u.mlme.status = MLME_TIMEOUT, 3891 }; 3892 3893 ieee80211_destroy_assoc_data(sdata, false); 3894 cfg80211_assoc_timeout(sdata->dev, bss); 3895 drv_event_callback(sdata->local, sdata, &event); 3896 } 3897 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3898 run_again(sdata, ifmgd->assoc_data->timeout); 3899 3900 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3901 ifmgd->associated) { 3902 u8 bssid[ETH_ALEN]; 3903 int max_tries; 3904 3905 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3906 3907 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 3908 max_tries = max_nullfunc_tries; 3909 else 3910 max_tries = max_probe_tries; 3911 3912 /* ACK received for nullfunc probing frame */ 3913 if (!ifmgd->probe_send_count) 3914 ieee80211_reset_ap_probe(sdata); 3915 else if (ifmgd->nullfunc_failed) { 3916 if (ifmgd->probe_send_count < max_tries) { 3917 mlme_dbg(sdata, 3918 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3919 bssid, ifmgd->probe_send_count, 3920 max_tries); 3921 ieee80211_mgd_probe_ap_send(sdata); 3922 } else { 3923 mlme_dbg(sdata, 3924 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3925 bssid); 3926 ieee80211_sta_connection_lost(sdata, bssid, 3927 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3928 false); 3929 } 3930 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3931 run_again(sdata, ifmgd->probe_timeout); 3932 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 3933 mlme_dbg(sdata, 3934 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3935 bssid, probe_wait_ms); 3936 ieee80211_sta_connection_lost(sdata, bssid, 3937 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3938 } else if (ifmgd->probe_send_count < max_tries) { 3939 mlme_dbg(sdata, 3940 "No probe response from AP %pM after %dms, try %d/%i\n", 3941 bssid, probe_wait_ms, 3942 ifmgd->probe_send_count, max_tries); 3943 ieee80211_mgd_probe_ap_send(sdata); 3944 } else { 3945 /* 3946 * We actually lost the connection ... or did we? 3947 * Let's make sure! 3948 */ 3949 wiphy_debug(local->hw.wiphy, 3950 "%s: No probe response from AP %pM" 3951 " after %dms, disconnecting.\n", 3952 sdata->name, 3953 bssid, probe_wait_ms); 3954 3955 ieee80211_sta_connection_lost(sdata, bssid, 3956 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3957 } 3958 } 3959 3960 sdata_unlock(sdata); 3961 } 3962 3963 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3964 { 3965 struct ieee80211_sub_if_data *sdata = 3966 (struct ieee80211_sub_if_data *) data; 3967 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3968 3969 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3970 return; 3971 3972 sdata->u.mgd.connection_loss = false; 3973 ieee80211_queue_work(&sdata->local->hw, 3974 &sdata->u.mgd.beacon_connection_loss_work); 3975 } 3976 3977 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3978 { 3979 struct ieee80211_sub_if_data *sdata = 3980 (struct ieee80211_sub_if_data *) data; 3981 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3982 struct ieee80211_local *local = sdata->local; 3983 3984 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3985 return; 3986 3987 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3988 } 3989 3990 static void ieee80211_sta_monitor_work(struct work_struct *work) 3991 { 3992 struct ieee80211_sub_if_data *sdata = 3993 container_of(work, struct ieee80211_sub_if_data, 3994 u.mgd.monitor_work); 3995 3996 ieee80211_mgd_probe_ap(sdata, false); 3997 } 3998 3999 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 4000 { 4001 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 4002 __ieee80211_stop_poll(sdata); 4003 4004 /* let's probe the connection once */ 4005 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR)) 4006 ieee80211_queue_work(&sdata->local->hw, 4007 &sdata->u.mgd.monitor_work); 4008 /* and do all the other regular work too */ 4009 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 4010 } 4011 } 4012 4013 #ifdef CONFIG_PM 4014 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 4015 { 4016 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4017 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4018 4019 sdata_lock(sdata); 4020 4021 if (ifmgd->auth_data || ifmgd->assoc_data) { 4022 const u8 *bssid = ifmgd->auth_data ? 4023 ifmgd->auth_data->bss->bssid : 4024 ifmgd->assoc_data->bss->bssid; 4025 4026 /* 4027 * If we are trying to authenticate / associate while suspending, 4028 * cfg80211 won't know and won't actually abort those attempts, 4029 * thus we need to do that ourselves. 4030 */ 4031 ieee80211_send_deauth_disassoc(sdata, bssid, 4032 IEEE80211_STYPE_DEAUTH, 4033 WLAN_REASON_DEAUTH_LEAVING, 4034 false, frame_buf); 4035 if (ifmgd->assoc_data) 4036 ieee80211_destroy_assoc_data(sdata, false); 4037 if (ifmgd->auth_data) 4038 ieee80211_destroy_auth_data(sdata, false); 4039 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4040 IEEE80211_DEAUTH_FRAME_LEN); 4041 } 4042 4043 /* This is a bit of a hack - we should find a better and more generic 4044 * solution to this. Normally when suspending, cfg80211 will in fact 4045 * deauthenticate. However, it doesn't (and cannot) stop an ongoing 4046 * auth (not so important) or assoc (this is the problem) process. 4047 * 4048 * As a consequence, it can happen that we are in the process of both 4049 * associating and suspending, and receive an association response 4050 * after cfg80211 has checked if it needs to disconnect, but before 4051 * we actually set the flag to drop incoming frames. This will then 4052 * cause the workqueue flush to process the association response in 4053 * the suspend, resulting in a successful association just before it 4054 * tries to remove the interface from the driver, which now though 4055 * has a channel context assigned ... this results in issues. 4056 * 4057 * To work around this (for now) simply deauth here again if we're 4058 * now connected. 4059 */ 4060 if (ifmgd->associated && !sdata->local->wowlan) { 4061 u8 bssid[ETH_ALEN]; 4062 struct cfg80211_deauth_request req = { 4063 .reason_code = WLAN_REASON_DEAUTH_LEAVING, 4064 .bssid = bssid, 4065 }; 4066 4067 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 4068 ieee80211_mgd_deauth(sdata, &req); 4069 } 4070 4071 sdata_unlock(sdata); 4072 } 4073 4074 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 4075 { 4076 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4077 4078 sdata_lock(sdata); 4079 if (!ifmgd->associated) { 4080 sdata_unlock(sdata); 4081 return; 4082 } 4083 4084 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4085 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4086 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4087 ieee80211_sta_connection_lost(sdata, 4088 ifmgd->associated->bssid, 4089 WLAN_REASON_UNSPECIFIED, 4090 true); 4091 sdata_unlock(sdata); 4092 return; 4093 } 4094 sdata_unlock(sdata); 4095 } 4096 #endif 4097 4098 /* interface setup */ 4099 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4100 { 4101 struct ieee80211_if_managed *ifmgd; 4102 4103 ifmgd = &sdata->u.mgd; 4104 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4105 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4106 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4107 ieee80211_beacon_connection_loss_work); 4108 INIT_WORK(&ifmgd->csa_connection_drop_work, 4109 ieee80211_csa_connection_drop_work); 4110 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4111 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4112 ieee80211_tdls_peer_del_work); 4113 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4114 (unsigned long) sdata); 4115 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4116 (unsigned long) sdata); 4117 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4118 (unsigned long) sdata); 4119 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4120 (unsigned long) sdata); 4121 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4122 ieee80211_sta_handle_tspec_ac_params_wk); 4123 4124 ifmgd->flags = 0; 4125 ifmgd->powersave = sdata->wdev.ps; 4126 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4127 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4128 ifmgd->p2p_noa_index = -1; 4129 4130 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4131 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4132 else 4133 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4134 4135 /* Setup TDLS data */ 4136 spin_lock_init(&ifmgd->teardown_lock); 4137 ifmgd->teardown_skb = NULL; 4138 ifmgd->orig_teardown_skb = NULL; 4139 } 4140 4141 /* scan finished notification */ 4142 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4143 { 4144 struct ieee80211_sub_if_data *sdata; 4145 4146 /* Restart STA timers */ 4147 rcu_read_lock(); 4148 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4149 if (ieee80211_sdata_running(sdata)) 4150 ieee80211_restart_sta_timer(sdata); 4151 } 4152 rcu_read_unlock(); 4153 } 4154 4155 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4156 struct cfg80211_bss *cbss) 4157 { 4158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4159 const u8 *ht_cap_ie, *vht_cap_ie; 4160 const struct ieee80211_ht_cap *ht_cap; 4161 const struct ieee80211_vht_cap *vht_cap; 4162 u8 chains = 1; 4163 4164 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4165 return chains; 4166 4167 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4168 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4169 ht_cap = (void *)(ht_cap_ie + 2); 4170 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4171 /* 4172 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4173 * "Tx Unequal Modulation Supported" fields. 4174 */ 4175 } 4176 4177 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4178 return chains; 4179 4180 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4181 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4182 u8 nss; 4183 u16 tx_mcs_map; 4184 4185 vht_cap = (void *)(vht_cap_ie + 2); 4186 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4187 for (nss = 8; nss > 0; nss--) { 4188 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4189 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4190 break; 4191 } 4192 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4193 chains = max(chains, nss); 4194 } 4195 4196 return chains; 4197 } 4198 4199 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4200 struct cfg80211_bss *cbss) 4201 { 4202 struct ieee80211_local *local = sdata->local; 4203 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4204 const struct ieee80211_ht_cap *ht_cap = NULL; 4205 const struct ieee80211_ht_operation *ht_oper = NULL; 4206 const struct ieee80211_vht_operation *vht_oper = NULL; 4207 struct ieee80211_supported_band *sband; 4208 struct cfg80211_chan_def chandef; 4209 int ret; 4210 u32 i; 4211 bool have_80mhz; 4212 4213 sband = local->hw.wiphy->bands[cbss->channel->band]; 4214 4215 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4216 IEEE80211_STA_DISABLE_80P80MHZ | 4217 IEEE80211_STA_DISABLE_160MHZ); 4218 4219 rcu_read_lock(); 4220 4221 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4222 sband->ht_cap.ht_supported) { 4223 const u8 *ht_oper_ie, *ht_cap_ie; 4224 4225 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4226 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4227 ht_oper = (void *)(ht_oper_ie + 2); 4228 4229 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4230 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4231 ht_cap = (void *)(ht_cap_ie + 2); 4232 4233 if (!ht_cap) { 4234 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4235 ht_oper = NULL; 4236 } 4237 } 4238 4239 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4240 sband->vht_cap.vht_supported) { 4241 const u8 *vht_oper_ie, *vht_cap; 4242 4243 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4244 WLAN_EID_VHT_OPERATION); 4245 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4246 vht_oper = (void *)(vht_oper_ie + 2); 4247 if (vht_oper && !ht_oper) { 4248 vht_oper = NULL; 4249 sdata_info(sdata, 4250 "AP advertised VHT without HT, disabling both\n"); 4251 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4252 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4253 } 4254 4255 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4256 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4257 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4258 vht_oper = NULL; 4259 } 4260 } 4261 4262 /* Allow VHT if at least one channel on the sband supports 80 MHz */ 4263 have_80mhz = false; 4264 for (i = 0; i < sband->n_channels; i++) { 4265 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED | 4266 IEEE80211_CHAN_NO_80MHZ)) 4267 continue; 4268 4269 have_80mhz = true; 4270 break; 4271 } 4272 4273 if (!have_80mhz) 4274 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4275 4276 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4277 cbss->channel, 4278 ht_cap, ht_oper, vht_oper, 4279 &chandef, false); 4280 4281 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4282 local->rx_chains); 4283 4284 rcu_read_unlock(); 4285 4286 /* will change later if needed */ 4287 sdata->smps_mode = IEEE80211_SMPS_OFF; 4288 4289 mutex_lock(&local->mtx); 4290 /* 4291 * If this fails (possibly due to channel context sharing 4292 * on incompatible channels, e.g. 80+80 and 160 sharing the 4293 * same control channel) try to use a smaller bandwidth. 4294 */ 4295 ret = ieee80211_vif_use_channel(sdata, &chandef, 4296 IEEE80211_CHANCTX_SHARED); 4297 4298 /* don't downgrade for 5 and 10 MHz channels, though. */ 4299 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4300 chandef.width == NL80211_CHAN_WIDTH_10) 4301 goto out; 4302 4303 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4304 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4305 ret = ieee80211_vif_use_channel(sdata, &chandef, 4306 IEEE80211_CHANCTX_SHARED); 4307 } 4308 out: 4309 mutex_unlock(&local->mtx); 4310 return ret; 4311 } 4312 4313 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4314 struct cfg80211_bss *cbss, bool assoc, 4315 bool override) 4316 { 4317 struct ieee80211_local *local = sdata->local; 4318 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4319 struct ieee80211_bss *bss = (void *)cbss->priv; 4320 struct sta_info *new_sta = NULL; 4321 struct ieee80211_supported_band *sband; 4322 bool have_sta = false; 4323 int err; 4324 4325 sband = local->hw.wiphy->bands[cbss->channel->band]; 4326 4327 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4328 return -EINVAL; 4329 4330 if (assoc) { 4331 rcu_read_lock(); 4332 have_sta = sta_info_get(sdata, cbss->bssid); 4333 rcu_read_unlock(); 4334 } 4335 4336 if (!have_sta) { 4337 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4338 if (!new_sta) 4339 return -ENOMEM; 4340 } 4341 4342 if (new_sta || override) { 4343 err = ieee80211_prep_channel(sdata, cbss); 4344 if (err) { 4345 if (new_sta) 4346 sta_info_free(local, new_sta); 4347 return -EINVAL; 4348 } 4349 } 4350 4351 if (new_sta) { 4352 u32 rates = 0, basic_rates = 0; 4353 bool have_higher_than_11mbit; 4354 int min_rate = INT_MAX, min_rate_index = -1; 4355 struct ieee80211_chanctx_conf *chanctx_conf; 4356 const struct cfg80211_bss_ies *ies; 4357 int shift = ieee80211_vif_get_shift(&sdata->vif); 4358 u32 rate_flags; 4359 4360 rcu_read_lock(); 4361 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4362 if (WARN_ON(!chanctx_conf)) { 4363 rcu_read_unlock(); 4364 sta_info_free(local, new_sta); 4365 return -EINVAL; 4366 } 4367 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4368 rcu_read_unlock(); 4369 4370 ieee80211_get_rates(sband, bss->supp_rates, 4371 bss->supp_rates_len, 4372 &rates, &basic_rates, 4373 &have_higher_than_11mbit, 4374 &min_rate, &min_rate_index, 4375 shift, rate_flags); 4376 4377 /* 4378 * This used to be a workaround for basic rates missing 4379 * in the association response frame. Now that we no 4380 * longer use the basic rates from there, it probably 4381 * doesn't happen any more, but keep the workaround so 4382 * in case some *other* APs are buggy in different ways 4383 * we can connect -- with a warning. 4384 */ 4385 if (!basic_rates && min_rate_index >= 0) { 4386 sdata_info(sdata, 4387 "No basic rates, using min rate instead\n"); 4388 basic_rates = BIT(min_rate_index); 4389 } 4390 4391 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4392 sdata->vif.bss_conf.basic_rates = basic_rates; 4393 4394 /* cf. IEEE 802.11 9.2.12 */ 4395 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 4396 have_higher_than_11mbit) 4397 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4398 else 4399 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4400 4401 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4402 4403 /* set timing information */ 4404 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4405 rcu_read_lock(); 4406 ies = rcu_dereference(cbss->beacon_ies); 4407 if (ies) { 4408 const u8 *tim_ie; 4409 4410 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4411 sdata->vif.bss_conf.sync_device_ts = 4412 bss->device_ts_beacon; 4413 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4414 ies->data, ies->len); 4415 if (tim_ie && tim_ie[1] >= 2) 4416 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4417 else 4418 sdata->vif.bss_conf.sync_dtim_count = 0; 4419 } else if (!ieee80211_hw_check(&sdata->local->hw, 4420 TIMING_BEACON_ONLY)) { 4421 ies = rcu_dereference(cbss->proberesp_ies); 4422 /* must be non-NULL since beacon IEs were NULL */ 4423 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4424 sdata->vif.bss_conf.sync_device_ts = 4425 bss->device_ts_presp; 4426 sdata->vif.bss_conf.sync_dtim_count = 0; 4427 } else { 4428 sdata->vif.bss_conf.sync_tsf = 0; 4429 sdata->vif.bss_conf.sync_device_ts = 0; 4430 sdata->vif.bss_conf.sync_dtim_count = 0; 4431 } 4432 rcu_read_unlock(); 4433 4434 /* tell driver about BSSID, basic rates and timing */ 4435 ieee80211_bss_info_change_notify(sdata, 4436 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4437 BSS_CHANGED_BEACON_INT); 4438 4439 if (assoc) 4440 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4441 4442 err = sta_info_insert(new_sta); 4443 new_sta = NULL; 4444 if (err) { 4445 sdata_info(sdata, 4446 "failed to insert STA entry for the AP (error %d)\n", 4447 err); 4448 return err; 4449 } 4450 } else 4451 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4452 4453 /* Cancel scan to ensure that nothing interferes with connection */ 4454 if (local->scanning) 4455 ieee80211_scan_cancel(local); 4456 4457 return 0; 4458 } 4459 4460 /* config hooks */ 4461 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4462 struct cfg80211_auth_request *req) 4463 { 4464 struct ieee80211_local *local = sdata->local; 4465 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4466 struct ieee80211_mgd_auth_data *auth_data; 4467 u16 auth_alg; 4468 int err; 4469 4470 /* prepare auth data structure */ 4471 4472 switch (req->auth_type) { 4473 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4474 auth_alg = WLAN_AUTH_OPEN; 4475 break; 4476 case NL80211_AUTHTYPE_SHARED_KEY: 4477 if (IS_ERR(local->wep_tx_tfm)) 4478 return -EOPNOTSUPP; 4479 auth_alg = WLAN_AUTH_SHARED_KEY; 4480 break; 4481 case NL80211_AUTHTYPE_FT: 4482 auth_alg = WLAN_AUTH_FT; 4483 break; 4484 case NL80211_AUTHTYPE_NETWORK_EAP: 4485 auth_alg = WLAN_AUTH_LEAP; 4486 break; 4487 case NL80211_AUTHTYPE_SAE: 4488 auth_alg = WLAN_AUTH_SAE; 4489 break; 4490 default: 4491 return -EOPNOTSUPP; 4492 } 4493 4494 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4495 req->ie_len, GFP_KERNEL); 4496 if (!auth_data) 4497 return -ENOMEM; 4498 4499 auth_data->bss = req->bss; 4500 4501 if (req->sae_data_len >= 4) { 4502 __le16 *pos = (__le16 *) req->sae_data; 4503 auth_data->sae_trans = le16_to_cpu(pos[0]); 4504 auth_data->sae_status = le16_to_cpu(pos[1]); 4505 memcpy(auth_data->data, req->sae_data + 4, 4506 req->sae_data_len - 4); 4507 auth_data->data_len += req->sae_data_len - 4; 4508 } 4509 4510 if (req->ie && req->ie_len) { 4511 memcpy(&auth_data->data[auth_data->data_len], 4512 req->ie, req->ie_len); 4513 auth_data->data_len += req->ie_len; 4514 } 4515 4516 if (req->key && req->key_len) { 4517 auth_data->key_len = req->key_len; 4518 auth_data->key_idx = req->key_idx; 4519 memcpy(auth_data->key, req->key, req->key_len); 4520 } 4521 4522 auth_data->algorithm = auth_alg; 4523 4524 /* try to authenticate/probe */ 4525 4526 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4527 ifmgd->assoc_data) { 4528 err = -EBUSY; 4529 goto err_free; 4530 } 4531 4532 if (ifmgd->auth_data) 4533 ieee80211_destroy_auth_data(sdata, false); 4534 4535 /* prep auth_data so we don't go into idle on disassoc */ 4536 ifmgd->auth_data = auth_data; 4537 4538 if (ifmgd->associated) { 4539 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4540 4541 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4542 WLAN_REASON_UNSPECIFIED, 4543 false, frame_buf); 4544 4545 ieee80211_report_disconnect(sdata, frame_buf, 4546 sizeof(frame_buf), true, 4547 WLAN_REASON_UNSPECIFIED); 4548 } 4549 4550 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4551 4552 err = ieee80211_prep_connection(sdata, req->bss, false, false); 4553 if (err) 4554 goto err_clear; 4555 4556 err = ieee80211_auth(sdata); 4557 if (err) { 4558 sta_info_destroy_addr(sdata, req->bss->bssid); 4559 goto err_clear; 4560 } 4561 4562 /* hold our own reference */ 4563 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4564 return 0; 4565 4566 err_clear: 4567 eth_zero_addr(ifmgd->bssid); 4568 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4569 ifmgd->auth_data = NULL; 4570 mutex_lock(&sdata->local->mtx); 4571 ieee80211_vif_release_channel(sdata); 4572 mutex_unlock(&sdata->local->mtx); 4573 err_free: 4574 kfree(auth_data); 4575 return err; 4576 } 4577 4578 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4579 struct cfg80211_assoc_request *req) 4580 { 4581 struct ieee80211_local *local = sdata->local; 4582 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4583 struct ieee80211_bss *bss = (void *)req->bss->priv; 4584 struct ieee80211_mgd_assoc_data *assoc_data; 4585 const struct cfg80211_bss_ies *beacon_ies; 4586 struct ieee80211_supported_band *sband; 4587 const u8 *ssidie, *ht_ie, *vht_ie; 4588 int i, err; 4589 bool override = false; 4590 4591 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4592 if (!assoc_data) 4593 return -ENOMEM; 4594 4595 rcu_read_lock(); 4596 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4597 if (!ssidie) { 4598 rcu_read_unlock(); 4599 kfree(assoc_data); 4600 return -EINVAL; 4601 } 4602 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4603 assoc_data->ssid_len = ssidie[1]; 4604 rcu_read_unlock(); 4605 4606 if (ifmgd->associated) { 4607 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4608 4609 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4610 WLAN_REASON_UNSPECIFIED, 4611 false, frame_buf); 4612 4613 ieee80211_report_disconnect(sdata, frame_buf, 4614 sizeof(frame_buf), true, 4615 WLAN_REASON_UNSPECIFIED); 4616 } 4617 4618 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4619 err = -EBUSY; 4620 goto err_free; 4621 } 4622 4623 if (ifmgd->assoc_data) { 4624 err = -EBUSY; 4625 goto err_free; 4626 } 4627 4628 if (ifmgd->auth_data) { 4629 bool match; 4630 4631 /* keep sta info, bssid if matching */ 4632 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4633 ieee80211_destroy_auth_data(sdata, match); 4634 } 4635 4636 /* prepare assoc data */ 4637 4638 ifmgd->beacon_crc_valid = false; 4639 4640 assoc_data->wmm = bss->wmm_used && 4641 (local->hw.queues >= IEEE80211_NUM_ACS); 4642 4643 /* 4644 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4645 * We still associate in non-HT mode (11a/b/g) if any one of these 4646 * ciphers is configured as pairwise. 4647 * We can set this to true for non-11n hardware, that'll be checked 4648 * separately along with the peer capabilities. 4649 */ 4650 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4651 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4652 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4653 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4654 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4655 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4656 netdev_info(sdata->dev, 4657 "disabling HT/VHT due to WEP/TKIP use\n"); 4658 } 4659 } 4660 4661 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4662 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4663 if (!sband->ht_cap.ht_supported || 4664 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4665 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4666 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4667 if (!bss->wmm_used && 4668 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4669 netdev_info(sdata->dev, 4670 "disabling HT as WMM/QoS is not supported by the AP\n"); 4671 } 4672 4673 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4674 if (!sband->vht_cap.vht_supported || 4675 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4676 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4677 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4678 if (!bss->wmm_used && 4679 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4680 netdev_info(sdata->dev, 4681 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4682 } 4683 4684 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4685 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4686 sizeof(ifmgd->ht_capa_mask)); 4687 4688 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4689 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4690 sizeof(ifmgd->vht_capa_mask)); 4691 4692 if (req->ie && req->ie_len) { 4693 memcpy(assoc_data->ie, req->ie, req->ie_len); 4694 assoc_data->ie_len = req->ie_len; 4695 } 4696 4697 assoc_data->bss = req->bss; 4698 4699 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4700 if (ifmgd->powersave) 4701 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4702 else 4703 sdata->smps_mode = IEEE80211_SMPS_OFF; 4704 } else 4705 sdata->smps_mode = ifmgd->req_smps; 4706 4707 assoc_data->capability = req->bss->capability; 4708 assoc_data->supp_rates = bss->supp_rates; 4709 assoc_data->supp_rates_len = bss->supp_rates_len; 4710 4711 rcu_read_lock(); 4712 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4713 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4714 assoc_data->ap_ht_param = 4715 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4716 else 4717 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4718 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4719 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4720 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4721 sizeof(struct ieee80211_vht_cap)); 4722 else 4723 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4724 rcu_read_unlock(); 4725 4726 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4727 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK), 4728 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4729 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4730 4731 if (bss->wmm_used && bss->uapsd_supported && 4732 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4733 assoc_data->uapsd = true; 4734 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4735 } else { 4736 assoc_data->uapsd = false; 4737 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4738 } 4739 4740 if (req->prev_bssid) 4741 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4742 4743 if (req->use_mfp) { 4744 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4745 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4746 } else { 4747 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4748 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4749 } 4750 4751 if (req->flags & ASSOC_REQ_USE_RRM) 4752 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4753 else 4754 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4755 4756 if (req->crypto.control_port) 4757 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4758 else 4759 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4760 4761 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4762 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4763 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4764 sdata->vif.type); 4765 4766 /* kick off associate process */ 4767 4768 ifmgd->assoc_data = assoc_data; 4769 ifmgd->dtim_period = 0; 4770 ifmgd->have_beacon = false; 4771 4772 /* override HT/VHT configuration only if the AP and we support it */ 4773 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 4774 struct ieee80211_sta_ht_cap sta_ht_cap; 4775 4776 if (req->flags & ASSOC_REQ_DISABLE_HT) 4777 override = true; 4778 4779 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4780 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4781 4782 /* check for 40 MHz disable override */ 4783 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) && 4784 sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 4785 !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 4786 override = true; 4787 4788 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4789 req->flags & ASSOC_REQ_DISABLE_VHT) 4790 override = true; 4791 } 4792 4793 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4794 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4795 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4796 } 4797 4798 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4799 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4800 4801 err = ieee80211_prep_connection(sdata, req->bss, true, override); 4802 if (err) 4803 goto err_clear; 4804 4805 rcu_read_lock(); 4806 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4807 4808 if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) && 4809 !beacon_ies) { 4810 /* 4811 * Wait up to one beacon interval ... 4812 * should this be more if we miss one? 4813 */ 4814 sdata_info(sdata, "waiting for beacon from %pM\n", 4815 ifmgd->bssid); 4816 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4817 assoc_data->timeout_started = true; 4818 assoc_data->need_beacon = true; 4819 } else if (beacon_ies) { 4820 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4821 beacon_ies->data, 4822 beacon_ies->len); 4823 u8 dtim_count = 0; 4824 4825 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4826 const struct ieee80211_tim_ie *tim; 4827 tim = (void *)(tim_ie + 2); 4828 ifmgd->dtim_period = tim->dtim_period; 4829 dtim_count = tim->dtim_count; 4830 } 4831 ifmgd->have_beacon = true; 4832 assoc_data->timeout = jiffies; 4833 assoc_data->timeout_started = true; 4834 4835 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) { 4836 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4837 sdata->vif.bss_conf.sync_device_ts = 4838 bss->device_ts_beacon; 4839 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4840 } 4841 } else { 4842 assoc_data->timeout = jiffies; 4843 assoc_data->timeout_started = true; 4844 } 4845 rcu_read_unlock(); 4846 4847 run_again(sdata, assoc_data->timeout); 4848 4849 if (bss->corrupt_data) { 4850 char *corrupt_type = "data"; 4851 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4852 if (bss->corrupt_data & 4853 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4854 corrupt_type = "beacon and probe response"; 4855 else 4856 corrupt_type = "beacon"; 4857 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4858 corrupt_type = "probe response"; 4859 sdata_info(sdata, "associating with AP with corrupt %s\n", 4860 corrupt_type); 4861 } 4862 4863 return 0; 4864 err_clear: 4865 eth_zero_addr(ifmgd->bssid); 4866 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4867 ifmgd->assoc_data = NULL; 4868 err_free: 4869 kfree(assoc_data); 4870 return err; 4871 } 4872 4873 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4874 struct cfg80211_deauth_request *req) 4875 { 4876 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4877 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4878 bool tx = !req->local_state_change; 4879 4880 if (ifmgd->auth_data && 4881 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4882 sdata_info(sdata, 4883 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4884 req->bssid, req->reason_code, 4885 ieee80211_get_reason_code_string(req->reason_code)); 4886 4887 drv_mgd_prepare_tx(sdata->local, sdata); 4888 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4889 IEEE80211_STYPE_DEAUTH, 4890 req->reason_code, tx, 4891 frame_buf); 4892 ieee80211_destroy_auth_data(sdata, false); 4893 ieee80211_report_disconnect(sdata, frame_buf, 4894 sizeof(frame_buf), true, 4895 req->reason_code); 4896 4897 return 0; 4898 } 4899 4900 if (ifmgd->assoc_data && 4901 ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) { 4902 sdata_info(sdata, 4903 "aborting association with %pM by local choice (Reason: %u=%s)\n", 4904 req->bssid, req->reason_code, 4905 ieee80211_get_reason_code_string(req->reason_code)); 4906 4907 drv_mgd_prepare_tx(sdata->local, sdata); 4908 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4909 IEEE80211_STYPE_DEAUTH, 4910 req->reason_code, tx, 4911 frame_buf); 4912 ieee80211_destroy_assoc_data(sdata, false); 4913 ieee80211_report_disconnect(sdata, frame_buf, 4914 sizeof(frame_buf), true, 4915 req->reason_code); 4916 return 0; 4917 } 4918 4919 if (ifmgd->associated && 4920 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4921 sdata_info(sdata, 4922 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4923 req->bssid, req->reason_code, 4924 ieee80211_get_reason_code_string(req->reason_code)); 4925 4926 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4927 req->reason_code, tx, frame_buf); 4928 ieee80211_report_disconnect(sdata, frame_buf, 4929 sizeof(frame_buf), true, 4930 req->reason_code); 4931 return 0; 4932 } 4933 4934 return -ENOTCONN; 4935 } 4936 4937 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4938 struct cfg80211_disassoc_request *req) 4939 { 4940 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4941 u8 bssid[ETH_ALEN]; 4942 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4943 4944 /* 4945 * cfg80211 should catch this ... but it's racy since 4946 * we can receive a disassoc frame, process it, hand it 4947 * to cfg80211 while that's in a locked section already 4948 * trying to tell us that the user wants to disconnect. 4949 */ 4950 if (ifmgd->associated != req->bss) 4951 return -ENOLINK; 4952 4953 sdata_info(sdata, 4954 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4955 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4956 4957 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4958 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4959 req->reason_code, !req->local_state_change, 4960 frame_buf); 4961 4962 ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true, 4963 req->reason_code); 4964 4965 return 0; 4966 } 4967 4968 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4969 { 4970 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4971 4972 /* 4973 * Make sure some work items will not run after this, 4974 * they will not do anything but might not have been 4975 * cancelled when disconnecting. 4976 */ 4977 cancel_work_sync(&ifmgd->monitor_work); 4978 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4979 cancel_work_sync(&ifmgd->request_smps_work); 4980 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4981 cancel_work_sync(&ifmgd->chswitch_work); 4982 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4983 4984 sdata_lock(sdata); 4985 if (ifmgd->assoc_data) { 4986 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4987 ieee80211_destroy_assoc_data(sdata, false); 4988 cfg80211_assoc_timeout(sdata->dev, bss); 4989 } 4990 if (ifmgd->auth_data) 4991 ieee80211_destroy_auth_data(sdata, false); 4992 spin_lock_bh(&ifmgd->teardown_lock); 4993 if (ifmgd->teardown_skb) { 4994 kfree_skb(ifmgd->teardown_skb); 4995 ifmgd->teardown_skb = NULL; 4996 ifmgd->orig_teardown_skb = NULL; 4997 } 4998 spin_unlock_bh(&ifmgd->teardown_lock); 4999 del_timer_sync(&ifmgd->timer); 5000 sdata_unlock(sdata); 5001 } 5002 5003 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 5004 enum nl80211_cqm_rssi_threshold_event rssi_event, 5005 gfp_t gfp) 5006 { 5007 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5008 5009 trace_api_cqm_rssi_notify(sdata, rssi_event); 5010 5011 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 5012 } 5013 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 5014 5015 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 5016 { 5017 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5018 5019 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 5020 5021 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 5022 } 5023 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 5024