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 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/if_ether.h> 17 #include <linux/skbuff.h> 18 #include <linux/if_arp.h> 19 #include <linux/etherdevice.h> 20 #include <linux/moduleparam.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/pm_qos.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 * Weight given to the latest Beacon frame when calculating average signal 85 * strength for Beacon frames received in the current BSS. This must be 86 * between 1 and 15. 87 */ 88 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 89 90 /* 91 * How many Beacon frames need to have been used in average signal strength 92 * before starting to indicate signal change events. 93 */ 94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 95 96 /* 97 * We can have multiple work items (and connection probing) 98 * scheduling this timer, but we need to take care to only 99 * reschedule it when it should fire _earlier_ than it was 100 * asked for before, or if it's not pending right now. This 101 * function ensures that. Note that it then is required to 102 * run this function for all timeouts after the first one 103 * has happened -- the work that runs from this timer will 104 * do that. 105 */ 106 static void run_again(struct ieee80211_sub_if_data *sdata, 107 unsigned long timeout) 108 { 109 sdata_assert_lock(sdata); 110 111 if (!timer_pending(&sdata->u.mgd.timer) || 112 time_before(timeout, sdata->u.mgd.timer.expires)) 113 mod_timer(&sdata->u.mgd.timer, timeout); 114 } 115 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 117 { 118 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 119 return; 120 121 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 122 return; 123 124 mod_timer(&sdata->u.mgd.bcn_mon_timer, 125 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 126 } 127 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 129 { 130 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 131 132 if (unlikely(!sdata->u.mgd.associated)) 133 return; 134 135 ifmgd->probe_send_count = 0; 136 137 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 138 return; 139 140 mod_timer(&sdata->u.mgd.conn_mon_timer, 141 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 142 } 143 144 static int ecw2cw(int ecw) 145 { 146 return (1 << ecw) - 1; 147 } 148 149 static u32 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 151 struct ieee80211_supported_band *sband, 152 struct ieee80211_channel *channel, 153 const struct ieee80211_ht_cap *ht_cap, 154 const struct ieee80211_ht_operation *ht_oper, 155 const struct ieee80211_vht_operation *vht_oper, 156 struct cfg80211_chan_def *chandef, bool tracking) 157 { 158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 159 struct cfg80211_chan_def vht_chandef; 160 struct ieee80211_sta_ht_cap sta_ht_cap; 161 u32 ht_cfreq, ret; 162 163 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 164 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 165 166 chandef->chan = channel; 167 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 168 chandef->center_freq1 = channel->center_freq; 169 chandef->center_freq2 = 0; 170 171 if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) { 172 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 173 goto out; 174 } 175 176 chandef->width = NL80211_CHAN_WIDTH_20; 177 178 if (!(ht_cap->cap_info & 179 cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) { 180 ret = IEEE80211_STA_DISABLE_40MHZ; 181 vht_chandef = *chandef; 182 goto out; 183 } 184 185 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 186 channel->band); 187 /* check that channel matches the right operating channel */ 188 if (!tracking && channel->center_freq != ht_cfreq) { 189 /* 190 * It's possible that some APs are confused here; 191 * Netgear WNDR3700 sometimes reports 4 higher than 192 * the actual channel in association responses, but 193 * since we look at probe response/beacon data here 194 * it should be OK. 195 */ 196 sdata_info(sdata, 197 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 198 channel->center_freq, ht_cfreq, 199 ht_oper->primary_chan, channel->band); 200 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 201 goto out; 202 } 203 204 /* check 40 MHz support, if we have it */ 205 if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 206 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 207 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 208 chandef->width = NL80211_CHAN_WIDTH_40; 209 chandef->center_freq1 += 10; 210 break; 211 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 212 chandef->width = NL80211_CHAN_WIDTH_40; 213 chandef->center_freq1 -= 10; 214 break; 215 } 216 } else { 217 /* 40 MHz (and 80 MHz) must be supported for VHT */ 218 ret = IEEE80211_STA_DISABLE_VHT; 219 /* also mark 40 MHz disabled */ 220 ret |= IEEE80211_STA_DISABLE_40MHZ; 221 goto out; 222 } 223 224 if (!vht_oper || !sband->vht_cap.vht_supported) { 225 ret = IEEE80211_STA_DISABLE_VHT; 226 goto out; 227 } 228 229 vht_chandef.chan = channel; 230 vht_chandef.center_freq1 = 231 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx, 232 channel->band); 233 vht_chandef.center_freq2 = 0; 234 235 switch (vht_oper->chan_width) { 236 case IEEE80211_VHT_CHANWIDTH_USE_HT: 237 vht_chandef.width = chandef->width; 238 vht_chandef.center_freq1 = chandef->center_freq1; 239 break; 240 case IEEE80211_VHT_CHANWIDTH_80MHZ: 241 vht_chandef.width = NL80211_CHAN_WIDTH_80; 242 break; 243 case IEEE80211_VHT_CHANWIDTH_160MHZ: 244 vht_chandef.width = NL80211_CHAN_WIDTH_160; 245 break; 246 case IEEE80211_VHT_CHANWIDTH_80P80MHZ: 247 vht_chandef.width = NL80211_CHAN_WIDTH_80P80; 248 vht_chandef.center_freq2 = 249 ieee80211_channel_to_frequency( 250 vht_oper->center_freq_seg2_idx, 251 channel->band); 252 break; 253 default: 254 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 255 sdata_info(sdata, 256 "AP VHT operation IE has invalid channel width (%d), disable VHT\n", 257 vht_oper->chan_width); 258 ret = IEEE80211_STA_DISABLE_VHT; 259 goto out; 260 } 261 262 if (!cfg80211_chandef_valid(&vht_chandef)) { 263 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 264 sdata_info(sdata, 265 "AP VHT information is invalid, disable VHT\n"); 266 ret = IEEE80211_STA_DISABLE_VHT; 267 goto out; 268 } 269 270 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 271 ret = 0; 272 goto out; 273 } 274 275 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 276 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 277 sdata_info(sdata, 278 "AP VHT information doesn't match HT, disable VHT\n"); 279 ret = IEEE80211_STA_DISABLE_VHT; 280 goto out; 281 } 282 283 *chandef = vht_chandef; 284 285 ret = 0; 286 287 out: 288 /* 289 * When tracking the current AP, don't do any further checks if the 290 * new chandef is identical to the one we're currently using for the 291 * connection. This keeps us from playing ping-pong with regulatory, 292 * without it the following can happen (for example): 293 * - connect to an AP with 80 MHz, world regdom allows 80 MHz 294 * - AP advertises regdom US 295 * - CRDA loads regdom US with 80 MHz prohibited (old database) 296 * - the code below detects an unsupported channel, downgrades, and 297 * we disconnect from the AP in the caller 298 * - disconnect causes CRDA to reload world regdomain and the game 299 * starts anew. 300 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881) 301 * 302 * It seems possible that there are still scenarios with CSA or real 303 * bandwidth changes where a this could happen, but those cases are 304 * less common and wouldn't completely prevent using the AP. 305 */ 306 if (tracking && 307 cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) 308 return ret; 309 310 /* don't print the message below for VHT mismatch if VHT is disabled */ 311 if (ret & IEEE80211_STA_DISABLE_VHT) 312 vht_chandef = *chandef; 313 314 /* 315 * Ignore the DISABLED flag when we're already connected and only 316 * tracking the APs beacon for bandwidth changes - otherwise we 317 * might get disconnected here if we connect to an AP, update our 318 * regulatory information based on the AP's country IE and the 319 * information we have is wrong/outdated and disables the channel 320 * that we're actually using for the connection to the AP. 321 */ 322 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 323 tracking ? 0 : 324 IEEE80211_CHAN_DISABLED)) { 325 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 326 ret = IEEE80211_STA_DISABLE_HT | 327 IEEE80211_STA_DISABLE_VHT; 328 break; 329 } 330 331 ret |= ieee80211_chandef_downgrade(chandef); 332 } 333 334 if (chandef->width != vht_chandef.width && !tracking) 335 sdata_info(sdata, 336 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 337 338 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 339 return ret; 340 } 341 342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 343 struct sta_info *sta, 344 const struct ieee80211_ht_cap *ht_cap, 345 const struct ieee80211_ht_operation *ht_oper, 346 const struct ieee80211_vht_operation *vht_oper, 347 const u8 *bssid, u32 *changed) 348 { 349 struct ieee80211_local *local = sdata->local; 350 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 351 struct ieee80211_supported_band *sband; 352 struct ieee80211_channel *chan; 353 struct cfg80211_chan_def chandef; 354 u16 ht_opmode; 355 u32 flags; 356 enum ieee80211_sta_rx_bandwidth new_sta_bw; 357 int ret; 358 359 /* if HT was/is disabled, don't track any bandwidth changes */ 360 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 361 return 0; 362 363 /* don't check VHT if we associated as non-VHT station */ 364 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 365 vht_oper = NULL; 366 367 if (WARN_ON_ONCE(!sta)) 368 return -EINVAL; 369 370 /* 371 * if bss configuration changed store the new one - 372 * this may be applicable even if channel is identical 373 */ 374 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 375 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 376 *changed |= BSS_CHANGED_HT; 377 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 378 } 379 380 chan = sdata->vif.bss_conf.chandef.chan; 381 sband = local->hw.wiphy->bands[chan->band]; 382 383 /* calculate new channel (type) based on HT/VHT operation IEs */ 384 flags = ieee80211_determine_chantype(sdata, sband, chan, 385 ht_cap, ht_oper, vht_oper, 386 &chandef, true); 387 388 /* 389 * Downgrade the new channel if we associated with restricted 390 * capabilities. For example, if we associated as a 20 MHz STA 391 * to a 40 MHz AP (due to regulatory, capabilities or config 392 * reasons) then switching to a 40 MHz channel now won't do us 393 * any good -- we couldn't use it with the AP. 394 */ 395 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 396 chandef.width == NL80211_CHAN_WIDTH_80P80) 397 flags |= ieee80211_chandef_downgrade(&chandef); 398 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 399 chandef.width == NL80211_CHAN_WIDTH_160) 400 flags |= ieee80211_chandef_downgrade(&chandef); 401 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 402 chandef.width > NL80211_CHAN_WIDTH_20) 403 flags |= ieee80211_chandef_downgrade(&chandef); 404 405 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 406 return 0; 407 408 sdata_info(sdata, 409 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 410 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 411 chandef.center_freq1, chandef.center_freq2); 412 413 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 414 IEEE80211_STA_DISABLE_VHT | 415 IEEE80211_STA_DISABLE_40MHZ | 416 IEEE80211_STA_DISABLE_80P80MHZ | 417 IEEE80211_STA_DISABLE_160MHZ)) || 418 !cfg80211_chandef_valid(&chandef)) { 419 sdata_info(sdata, 420 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 421 ifmgd->bssid); 422 return -EINVAL; 423 } 424 425 switch (chandef.width) { 426 case NL80211_CHAN_WIDTH_20_NOHT: 427 case NL80211_CHAN_WIDTH_20: 428 new_sta_bw = IEEE80211_STA_RX_BW_20; 429 break; 430 case NL80211_CHAN_WIDTH_40: 431 new_sta_bw = IEEE80211_STA_RX_BW_40; 432 break; 433 case NL80211_CHAN_WIDTH_80: 434 new_sta_bw = IEEE80211_STA_RX_BW_80; 435 break; 436 case NL80211_CHAN_WIDTH_80P80: 437 case NL80211_CHAN_WIDTH_160: 438 new_sta_bw = IEEE80211_STA_RX_BW_160; 439 break; 440 default: 441 return -EINVAL; 442 } 443 444 if (new_sta_bw > sta->cur_max_bandwidth) 445 new_sta_bw = sta->cur_max_bandwidth; 446 447 if (new_sta_bw < sta->sta.bandwidth) { 448 sta->sta.bandwidth = new_sta_bw; 449 rate_control_rate_update(local, sband, sta, 450 IEEE80211_RC_BW_CHANGED); 451 } 452 453 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 454 if (ret) { 455 sdata_info(sdata, 456 "AP %pM changed bandwidth to incompatible one - disconnect\n", 457 ifmgd->bssid); 458 return ret; 459 } 460 461 if (new_sta_bw > sta->sta.bandwidth) { 462 sta->sta.bandwidth = new_sta_bw; 463 rate_control_rate_update(local, sband, sta, 464 IEEE80211_RC_BW_CHANGED); 465 } 466 467 return 0; 468 } 469 470 /* frame sending functions */ 471 472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 473 struct sk_buff *skb, u8 ap_ht_param, 474 struct ieee80211_supported_band *sband, 475 struct ieee80211_channel *channel, 476 enum ieee80211_smps_mode smps) 477 { 478 u8 *pos; 479 u32 flags = channel->flags; 480 u16 cap; 481 struct ieee80211_sta_ht_cap ht_cap; 482 483 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 484 485 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 486 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 487 488 /* determine capability flags */ 489 cap = ht_cap.cap; 490 491 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 492 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 493 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 494 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 495 cap &= ~IEEE80211_HT_CAP_SGI_40; 496 } 497 break; 498 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 499 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 500 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 501 cap &= ~IEEE80211_HT_CAP_SGI_40; 502 } 503 break; 504 } 505 506 /* 507 * If 40 MHz was disabled associate as though we weren't 508 * capable of 40 MHz -- some broken APs will never fall 509 * back to trying to transmit in 20 MHz. 510 */ 511 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 512 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 513 cap &= ~IEEE80211_HT_CAP_SGI_40; 514 } 515 516 /* set SM PS mode properly */ 517 cap &= ~IEEE80211_HT_CAP_SM_PS; 518 switch (smps) { 519 case IEEE80211_SMPS_AUTOMATIC: 520 case IEEE80211_SMPS_NUM_MODES: 521 WARN_ON(1); 522 case IEEE80211_SMPS_OFF: 523 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 524 IEEE80211_HT_CAP_SM_PS_SHIFT; 525 break; 526 case IEEE80211_SMPS_STATIC: 527 cap |= WLAN_HT_CAP_SM_PS_STATIC << 528 IEEE80211_HT_CAP_SM_PS_SHIFT; 529 break; 530 case IEEE80211_SMPS_DYNAMIC: 531 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 532 IEEE80211_HT_CAP_SM_PS_SHIFT; 533 break; 534 } 535 536 /* reserve and fill IE */ 537 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 538 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 539 } 540 541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 542 struct sk_buff *skb, 543 struct ieee80211_supported_band *sband, 544 struct ieee80211_vht_cap *ap_vht_cap) 545 { 546 u8 *pos; 547 u32 cap; 548 struct ieee80211_sta_vht_cap vht_cap; 549 u32 mask, ap_bf_sts, our_bf_sts; 550 551 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 552 553 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 554 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 555 556 /* determine capability flags */ 557 cap = vht_cap.cap; 558 559 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 560 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 561 562 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 563 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ || 564 bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 565 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 566 } 567 568 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 569 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 570 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 571 } 572 573 /* 574 * Some APs apparently get confused if our capabilities are better 575 * than theirs, so restrict what we advertise in the assoc request. 576 */ 577 if (!(ap_vht_cap->vht_cap_info & 578 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 579 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE; 580 581 mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK; 582 583 ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask; 584 our_bf_sts = cap & mask; 585 586 if (ap_bf_sts < our_bf_sts) { 587 cap &= ~mask; 588 cap |= ap_bf_sts; 589 } 590 591 /* reserve and fill IE */ 592 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 593 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 594 } 595 596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 597 { 598 struct ieee80211_local *local = sdata->local; 599 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 600 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 601 struct sk_buff *skb; 602 struct ieee80211_mgmt *mgmt; 603 u8 *pos, qos_info; 604 size_t offset = 0, noffset; 605 int i, count, rates_len, supp_rates_len, shift; 606 u16 capab; 607 struct ieee80211_supported_band *sband; 608 struct ieee80211_chanctx_conf *chanctx_conf; 609 struct ieee80211_channel *chan; 610 u32 rate_flags, rates = 0; 611 612 sdata_assert_lock(sdata); 613 614 rcu_read_lock(); 615 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 616 if (WARN_ON(!chanctx_conf)) { 617 rcu_read_unlock(); 618 return; 619 } 620 chan = chanctx_conf->def.chan; 621 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 622 rcu_read_unlock(); 623 sband = local->hw.wiphy->bands[chan->band]; 624 shift = ieee80211_vif_get_shift(&sdata->vif); 625 626 if (assoc_data->supp_rates_len) { 627 /* 628 * Get all rates supported by the device and the AP as 629 * some APs don't like getting a superset of their rates 630 * in the association request (e.g. D-Link DAP 1353 in 631 * b-only mode)... 632 */ 633 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 634 assoc_data->supp_rates, 635 assoc_data->supp_rates_len, 636 &rates); 637 } else { 638 /* 639 * In case AP not provide any supported rates information 640 * before association, we send information element(s) with 641 * all rates that we support. 642 */ 643 rates_len = 0; 644 for (i = 0; i < sband->n_bitrates; i++) { 645 if ((rate_flags & sband->bitrates[i].flags) 646 != rate_flags) 647 continue; 648 rates |= BIT(i); 649 rates_len++; 650 } 651 } 652 653 skb = alloc_skb(local->hw.extra_tx_headroom + 654 sizeof(*mgmt) + /* bit too much but doesn't matter */ 655 2 + assoc_data->ssid_len + /* SSID */ 656 4 + rates_len + /* (extended) rates */ 657 4 + /* power capability */ 658 2 + 2 * sband->n_channels + /* supported channels */ 659 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 660 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 661 assoc_data->ie_len + /* extra IEs */ 662 9, /* WMM */ 663 GFP_KERNEL); 664 if (!skb) 665 return; 666 667 skb_reserve(skb, local->hw.extra_tx_headroom); 668 669 capab = WLAN_CAPABILITY_ESS; 670 671 if (sband->band == IEEE80211_BAND_2GHZ) { 672 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 673 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 674 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 675 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 676 } 677 678 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 679 capab |= WLAN_CAPABILITY_PRIVACY; 680 681 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 682 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 683 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 684 685 if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM) 686 capab |= WLAN_CAPABILITY_RADIO_MEASURE; 687 688 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 689 memset(mgmt, 0, 24); 690 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 691 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 692 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 693 694 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 695 skb_put(skb, 10); 696 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 697 IEEE80211_STYPE_REASSOC_REQ); 698 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 699 mgmt->u.reassoc_req.listen_interval = 700 cpu_to_le16(local->hw.conf.listen_interval); 701 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 702 ETH_ALEN); 703 } else { 704 skb_put(skb, 4); 705 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 706 IEEE80211_STYPE_ASSOC_REQ); 707 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 708 mgmt->u.assoc_req.listen_interval = 709 cpu_to_le16(local->hw.conf.listen_interval); 710 } 711 712 /* SSID */ 713 pos = skb_put(skb, 2 + assoc_data->ssid_len); 714 *pos++ = WLAN_EID_SSID; 715 *pos++ = assoc_data->ssid_len; 716 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 717 718 /* add all rates which were marked to be used above */ 719 supp_rates_len = rates_len; 720 if (supp_rates_len > 8) 721 supp_rates_len = 8; 722 723 pos = skb_put(skb, supp_rates_len + 2); 724 *pos++ = WLAN_EID_SUPP_RATES; 725 *pos++ = supp_rates_len; 726 727 count = 0; 728 for (i = 0; i < sband->n_bitrates; i++) { 729 if (BIT(i) & rates) { 730 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 731 5 * (1 << shift)); 732 *pos++ = (u8) rate; 733 if (++count == 8) 734 break; 735 } 736 } 737 738 if (rates_len > count) { 739 pos = skb_put(skb, rates_len - count + 2); 740 *pos++ = WLAN_EID_EXT_SUPP_RATES; 741 *pos++ = rates_len - count; 742 743 for (i++; i < sband->n_bitrates; i++) { 744 if (BIT(i) & rates) { 745 int rate; 746 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 747 5 * (1 << shift)); 748 *pos++ = (u8) rate; 749 } 750 } 751 } 752 753 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT || 754 capab & WLAN_CAPABILITY_RADIO_MEASURE) { 755 pos = skb_put(skb, 4); 756 *pos++ = WLAN_EID_PWR_CAPABILITY; 757 *pos++ = 2; 758 *pos++ = 0; /* min tx power */ 759 /* max tx power */ 760 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 761 } 762 763 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 764 /* TODO: get this in reg domain format */ 765 pos = skb_put(skb, 2 * sband->n_channels + 2); 766 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 767 *pos++ = 2 * sband->n_channels; 768 for (i = 0; i < sband->n_channels; i++) { 769 *pos++ = ieee80211_frequency_to_channel( 770 sband->channels[i].center_freq); 771 *pos++ = 1; /* one channel in the subband*/ 772 } 773 } 774 775 /* if present, add any custom IEs that go before HT */ 776 if (assoc_data->ie_len) { 777 static const u8 before_ht[] = { 778 WLAN_EID_SSID, 779 WLAN_EID_SUPP_RATES, 780 WLAN_EID_EXT_SUPP_RATES, 781 WLAN_EID_PWR_CAPABILITY, 782 WLAN_EID_SUPPORTED_CHANNELS, 783 WLAN_EID_RSN, 784 WLAN_EID_QOS_CAPA, 785 WLAN_EID_RRM_ENABLED_CAPABILITIES, 786 WLAN_EID_MOBILITY_DOMAIN, 787 WLAN_EID_FAST_BSS_TRANSITION, /* reassoc only */ 788 WLAN_EID_RIC_DATA, /* reassoc only */ 789 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 790 }; 791 static const u8 after_ric[] = { 792 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 793 WLAN_EID_HT_CAPABILITY, 794 WLAN_EID_BSS_COEX_2040, 795 WLAN_EID_EXT_CAPABILITY, 796 WLAN_EID_QOS_TRAFFIC_CAPA, 797 WLAN_EID_TIM_BCAST_REQ, 798 WLAN_EID_INTERWORKING, 799 /* 60GHz doesn't happen right now */ 800 WLAN_EID_VHT_CAPABILITY, 801 WLAN_EID_OPMODE_NOTIF, 802 }; 803 804 noffset = ieee80211_ie_split_ric(assoc_data->ie, 805 assoc_data->ie_len, 806 before_ht, 807 ARRAY_SIZE(before_ht), 808 after_ric, 809 ARRAY_SIZE(after_ric), 810 offset); 811 pos = skb_put(skb, noffset - offset); 812 memcpy(pos, assoc_data->ie + offset, noffset - offset); 813 offset = noffset; 814 } 815 816 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 817 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 818 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 819 820 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 821 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 822 sband, chan, sdata->smps_mode); 823 824 /* if present, add any custom IEs that go before VHT */ 825 if (assoc_data->ie_len) { 826 static const u8 before_vht[] = { 827 WLAN_EID_SSID, 828 WLAN_EID_SUPP_RATES, 829 WLAN_EID_EXT_SUPP_RATES, 830 WLAN_EID_PWR_CAPABILITY, 831 WLAN_EID_SUPPORTED_CHANNELS, 832 WLAN_EID_RSN, 833 WLAN_EID_QOS_CAPA, 834 WLAN_EID_RRM_ENABLED_CAPABILITIES, 835 WLAN_EID_MOBILITY_DOMAIN, 836 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 837 WLAN_EID_HT_CAPABILITY, 838 WLAN_EID_BSS_COEX_2040, 839 WLAN_EID_EXT_CAPABILITY, 840 WLAN_EID_QOS_TRAFFIC_CAPA, 841 WLAN_EID_TIM_BCAST_REQ, 842 WLAN_EID_INTERWORKING, 843 }; 844 845 /* RIC already taken above, so no need to handle here anymore */ 846 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 847 before_vht, ARRAY_SIZE(before_vht), 848 offset); 849 pos = skb_put(skb, noffset - offset); 850 memcpy(pos, assoc_data->ie + offset, noffset - offset); 851 offset = noffset; 852 } 853 854 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 855 ieee80211_add_vht_ie(sdata, skb, sband, 856 &assoc_data->ap_vht_cap); 857 858 /* if present, add any custom non-vendor IEs that go after HT */ 859 if (assoc_data->ie_len) { 860 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 861 assoc_data->ie_len, 862 offset); 863 pos = skb_put(skb, noffset - offset); 864 memcpy(pos, assoc_data->ie + offset, noffset - offset); 865 offset = noffset; 866 } 867 868 if (assoc_data->wmm) { 869 if (assoc_data->uapsd) { 870 qos_info = ifmgd->uapsd_queues; 871 qos_info |= (ifmgd->uapsd_max_sp_len << 872 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 873 } else { 874 qos_info = 0; 875 } 876 877 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info); 878 } 879 880 /* add any remaining custom (i.e. vendor specific here) IEs */ 881 if (assoc_data->ie_len) { 882 noffset = assoc_data->ie_len; 883 pos = skb_put(skb, noffset - offset); 884 memcpy(pos, assoc_data->ie + offset, noffset - offset); 885 } 886 887 drv_mgd_prepare_tx(local, sdata); 888 889 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 890 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 891 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 892 IEEE80211_TX_INTFL_MLME_CONN_TX; 893 ieee80211_tx_skb(sdata, skb); 894 } 895 896 void ieee80211_send_pspoll(struct ieee80211_local *local, 897 struct ieee80211_sub_if_data *sdata) 898 { 899 struct ieee80211_pspoll *pspoll; 900 struct sk_buff *skb; 901 902 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 903 if (!skb) 904 return; 905 906 pspoll = (struct ieee80211_pspoll *) skb->data; 907 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 908 909 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 910 ieee80211_tx_skb(sdata, skb); 911 } 912 913 void ieee80211_send_nullfunc(struct ieee80211_local *local, 914 struct ieee80211_sub_if_data *sdata, 915 int powersave) 916 { 917 struct sk_buff *skb; 918 struct ieee80211_hdr_3addr *nullfunc; 919 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 920 921 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 922 if (!skb) 923 return; 924 925 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 926 if (powersave) 927 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 928 929 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 930 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 931 932 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 933 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 934 935 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 936 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 937 938 ieee80211_tx_skb(sdata, skb); 939 } 940 941 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 942 struct ieee80211_sub_if_data *sdata) 943 { 944 struct sk_buff *skb; 945 struct ieee80211_hdr *nullfunc; 946 __le16 fc; 947 948 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 949 return; 950 951 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 952 if (!skb) 953 return; 954 955 skb_reserve(skb, local->hw.extra_tx_headroom); 956 957 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 958 memset(nullfunc, 0, 30); 959 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 960 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 961 nullfunc->frame_control = fc; 962 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 963 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 964 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 965 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 966 967 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 968 ieee80211_tx_skb(sdata, skb); 969 } 970 971 /* spectrum management related things */ 972 static void ieee80211_chswitch_work(struct work_struct *work) 973 { 974 struct ieee80211_sub_if_data *sdata = 975 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 976 struct ieee80211_local *local = sdata->local; 977 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 978 int ret; 979 980 if (!ieee80211_sdata_running(sdata)) 981 return; 982 983 sdata_lock(sdata); 984 mutex_lock(&local->mtx); 985 mutex_lock(&local->chanctx_mtx); 986 987 if (!ifmgd->associated) 988 goto out; 989 990 if (!sdata->vif.csa_active) 991 goto out; 992 993 /* 994 * using reservation isn't immediate as it may be deferred until later 995 * with multi-vif. once reservation is complete it will re-schedule the 996 * work with no reserved_chanctx so verify chandef to check if it 997 * completed successfully 998 */ 999 1000 if (sdata->reserved_chanctx) { 1001 /* 1002 * with multi-vif csa driver may call ieee80211_csa_finish() 1003 * many times while waiting for other interfaces to use their 1004 * reservations 1005 */ 1006 if (sdata->reserved_ready) 1007 goto out; 1008 1009 ret = ieee80211_vif_use_reserved_context(sdata); 1010 if (ret) { 1011 sdata_info(sdata, 1012 "failed to use reserved channel context, disconnecting (err=%d)\n", 1013 ret); 1014 ieee80211_queue_work(&sdata->local->hw, 1015 &ifmgd->csa_connection_drop_work); 1016 goto out; 1017 } 1018 1019 goto out; 1020 } 1021 1022 if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef, 1023 &sdata->csa_chandef)) { 1024 sdata_info(sdata, 1025 "failed to finalize channel switch, disconnecting\n"); 1026 ieee80211_queue_work(&sdata->local->hw, 1027 &ifmgd->csa_connection_drop_work); 1028 goto out; 1029 } 1030 1031 /* XXX: shouldn't really modify cfg80211-owned data! */ 1032 ifmgd->associated->channel = sdata->csa_chandef.chan; 1033 1034 ifmgd->csa_waiting_bcn = true; 1035 1036 ieee80211_sta_reset_beacon_monitor(sdata); 1037 ieee80211_sta_reset_conn_monitor(sdata); 1038 1039 out: 1040 mutex_unlock(&local->chanctx_mtx); 1041 mutex_unlock(&local->mtx); 1042 sdata_unlock(sdata); 1043 } 1044 1045 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata) 1046 { 1047 struct ieee80211_local *local = sdata->local; 1048 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1049 int ret; 1050 1051 sdata_assert_lock(sdata); 1052 1053 WARN_ON(!sdata->vif.csa_active); 1054 1055 if (sdata->csa_block_tx) { 1056 ieee80211_wake_vif_queues(local, sdata, 1057 IEEE80211_QUEUE_STOP_REASON_CSA); 1058 sdata->csa_block_tx = false; 1059 } 1060 1061 sdata->vif.csa_active = false; 1062 ifmgd->csa_waiting_bcn = false; 1063 1064 ret = drv_post_channel_switch(sdata); 1065 if (ret) { 1066 sdata_info(sdata, 1067 "driver post channel switch failed, disconnecting\n"); 1068 ieee80211_queue_work(&local->hw, 1069 &ifmgd->csa_connection_drop_work); 1070 return; 1071 } 1072 1073 cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef); 1074 } 1075 1076 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1077 { 1078 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1079 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1080 1081 trace_api_chswitch_done(sdata, success); 1082 if (!success) { 1083 sdata_info(sdata, 1084 "driver channel switch failed, disconnecting\n"); 1085 ieee80211_queue_work(&sdata->local->hw, 1086 &ifmgd->csa_connection_drop_work); 1087 } else { 1088 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1089 } 1090 } 1091 EXPORT_SYMBOL(ieee80211_chswitch_done); 1092 1093 static void ieee80211_chswitch_timer(unsigned long data) 1094 { 1095 struct ieee80211_sub_if_data *sdata = 1096 (struct ieee80211_sub_if_data *) data; 1097 1098 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 1099 } 1100 1101 static void 1102 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1103 u64 timestamp, u32 device_timestamp, 1104 struct ieee802_11_elems *elems, 1105 bool beacon) 1106 { 1107 struct ieee80211_local *local = sdata->local; 1108 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1109 struct cfg80211_bss *cbss = ifmgd->associated; 1110 struct ieee80211_chanctx_conf *conf; 1111 struct ieee80211_chanctx *chanctx; 1112 enum ieee80211_band current_band; 1113 struct ieee80211_csa_ie csa_ie; 1114 struct ieee80211_channel_switch ch_switch; 1115 int res; 1116 1117 sdata_assert_lock(sdata); 1118 1119 if (!cbss) 1120 return; 1121 1122 if (local->scanning) 1123 return; 1124 1125 /* disregard subsequent announcements if we are already processing */ 1126 if (sdata->vif.csa_active) 1127 return; 1128 1129 current_band = cbss->channel->band; 1130 memset(&csa_ie, 0, sizeof(csa_ie)); 1131 res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band, 1132 ifmgd->flags, 1133 ifmgd->associated->bssid, &csa_ie); 1134 if (res < 0) 1135 ieee80211_queue_work(&local->hw, 1136 &ifmgd->csa_connection_drop_work); 1137 if (res) 1138 return; 1139 1140 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 1141 IEEE80211_CHAN_DISABLED)) { 1142 sdata_info(sdata, 1143 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 1144 ifmgd->associated->bssid, 1145 csa_ie.chandef.chan->center_freq, 1146 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 1147 csa_ie.chandef.center_freq2); 1148 ieee80211_queue_work(&local->hw, 1149 &ifmgd->csa_connection_drop_work); 1150 return; 1151 } 1152 1153 if (cfg80211_chandef_identical(&csa_ie.chandef, 1154 &sdata->vif.bss_conf.chandef)) { 1155 if (ifmgd->csa_ignored_same_chan) 1156 return; 1157 sdata_info(sdata, 1158 "AP %pM tries to chanswitch to same channel, ignore\n", 1159 ifmgd->associated->bssid); 1160 ifmgd->csa_ignored_same_chan = true; 1161 return; 1162 } 1163 1164 mutex_lock(&local->mtx); 1165 mutex_lock(&local->chanctx_mtx); 1166 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1167 lockdep_is_held(&local->chanctx_mtx)); 1168 if (!conf) { 1169 sdata_info(sdata, 1170 "no channel context assigned to vif?, disconnecting\n"); 1171 ieee80211_queue_work(&local->hw, 1172 &ifmgd->csa_connection_drop_work); 1173 mutex_unlock(&local->chanctx_mtx); 1174 mutex_unlock(&local->mtx); 1175 return; 1176 } 1177 1178 chanctx = container_of(conf, struct ieee80211_chanctx, conf); 1179 1180 if (local->use_chanctx && 1181 !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) { 1182 sdata_info(sdata, 1183 "driver doesn't support chan-switch with channel contexts\n"); 1184 ieee80211_queue_work(&local->hw, 1185 &ifmgd->csa_connection_drop_work); 1186 mutex_unlock(&local->chanctx_mtx); 1187 mutex_unlock(&local->mtx); 1188 return; 1189 } 1190 1191 ch_switch.timestamp = timestamp; 1192 ch_switch.device_timestamp = device_timestamp; 1193 ch_switch.block_tx = csa_ie.mode; 1194 ch_switch.chandef = csa_ie.chandef; 1195 ch_switch.count = csa_ie.count; 1196 1197 if (drv_pre_channel_switch(sdata, &ch_switch)) { 1198 sdata_info(sdata, 1199 "preparing for channel switch failed, disconnecting\n"); 1200 ieee80211_queue_work(&local->hw, 1201 &ifmgd->csa_connection_drop_work); 1202 mutex_unlock(&local->chanctx_mtx); 1203 mutex_unlock(&local->mtx); 1204 return; 1205 } 1206 1207 res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef, 1208 chanctx->mode, false); 1209 if (res) { 1210 sdata_info(sdata, 1211 "failed to reserve channel context for channel switch, disconnecting (err=%d)\n", 1212 res); 1213 ieee80211_queue_work(&local->hw, 1214 &ifmgd->csa_connection_drop_work); 1215 mutex_unlock(&local->chanctx_mtx); 1216 mutex_unlock(&local->mtx); 1217 return; 1218 } 1219 mutex_unlock(&local->chanctx_mtx); 1220 1221 sdata->vif.csa_active = true; 1222 sdata->csa_chandef = csa_ie.chandef; 1223 sdata->csa_block_tx = csa_ie.mode; 1224 ifmgd->csa_ignored_same_chan = false; 1225 1226 if (sdata->csa_block_tx) 1227 ieee80211_stop_vif_queues(local, sdata, 1228 IEEE80211_QUEUE_STOP_REASON_CSA); 1229 mutex_unlock(&local->mtx); 1230 1231 cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef, 1232 csa_ie.count); 1233 1234 if (local->ops->channel_switch) { 1235 /* use driver's channel switch callback */ 1236 drv_channel_switch(local, sdata, &ch_switch); 1237 return; 1238 } 1239 1240 /* channel switch handled in software */ 1241 if (csa_ie.count <= 1) 1242 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1243 else 1244 mod_timer(&ifmgd->chswitch_timer, 1245 TU_TO_EXP_TIME((csa_ie.count - 1) * 1246 cbss->beacon_interval)); 1247 } 1248 1249 static bool 1250 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata, 1251 struct ieee80211_channel *channel, 1252 const u8 *country_ie, u8 country_ie_len, 1253 const u8 *pwr_constr_elem, 1254 int *chan_pwr, int *pwr_reduction) 1255 { 1256 struct ieee80211_country_ie_triplet *triplet; 1257 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1258 int i, chan_increment; 1259 bool have_chan_pwr = false; 1260 1261 /* Invalid IE */ 1262 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1263 return false; 1264 1265 triplet = (void *)(country_ie + 3); 1266 country_ie_len -= 3; 1267 1268 switch (channel->band) { 1269 default: 1270 WARN_ON_ONCE(1); 1271 /* fall through */ 1272 case IEEE80211_BAND_2GHZ: 1273 case IEEE80211_BAND_60GHZ: 1274 chan_increment = 1; 1275 break; 1276 case IEEE80211_BAND_5GHZ: 1277 chan_increment = 4; 1278 break; 1279 } 1280 1281 /* find channel */ 1282 while (country_ie_len >= 3) { 1283 u8 first_channel = triplet->chans.first_channel; 1284 1285 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1286 goto next; 1287 1288 for (i = 0; i < triplet->chans.num_channels; i++) { 1289 if (first_channel + i * chan_increment == chan) { 1290 have_chan_pwr = true; 1291 *chan_pwr = triplet->chans.max_power; 1292 break; 1293 } 1294 } 1295 if (have_chan_pwr) 1296 break; 1297 1298 next: 1299 triplet++; 1300 country_ie_len -= 3; 1301 } 1302 1303 if (have_chan_pwr && pwr_constr_elem) 1304 *pwr_reduction = *pwr_constr_elem; 1305 else 1306 *pwr_reduction = 0; 1307 1308 return have_chan_pwr; 1309 } 1310 1311 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata, 1312 struct ieee80211_channel *channel, 1313 const u8 *cisco_dtpc_ie, 1314 int *pwr_level) 1315 { 1316 /* From practical testing, the first data byte of the DTPC element 1317 * seems to contain the requested dBm level, and the CLI on Cisco 1318 * APs clearly state the range is -127 to 127 dBm, which indicates 1319 * a signed byte, although it seemingly never actually goes negative. 1320 * The other byte seems to always be zero. 1321 */ 1322 *pwr_level = (__s8)cisco_dtpc_ie[4]; 1323 } 1324 1325 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1326 struct ieee80211_channel *channel, 1327 struct ieee80211_mgmt *mgmt, 1328 const u8 *country_ie, u8 country_ie_len, 1329 const u8 *pwr_constr_ie, 1330 const u8 *cisco_dtpc_ie) 1331 { 1332 bool has_80211h_pwr = false, has_cisco_pwr = false; 1333 int chan_pwr = 0, pwr_reduction_80211h = 0; 1334 int pwr_level_cisco, pwr_level_80211h; 1335 int new_ap_level; 1336 __le16 capab = mgmt->u.probe_resp.capab_info; 1337 1338 if (country_ie && 1339 (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) || 1340 capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) { 1341 has_80211h_pwr = ieee80211_find_80211h_pwr_constr( 1342 sdata, channel, country_ie, country_ie_len, 1343 pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h); 1344 pwr_level_80211h = 1345 max_t(int, 0, chan_pwr - pwr_reduction_80211h); 1346 } 1347 1348 if (cisco_dtpc_ie) { 1349 ieee80211_find_cisco_dtpc( 1350 sdata, channel, cisco_dtpc_ie, &pwr_level_cisco); 1351 has_cisco_pwr = true; 1352 } 1353 1354 if (!has_80211h_pwr && !has_cisco_pwr) 1355 return 0; 1356 1357 /* If we have both 802.11h and Cisco DTPC, apply both limits 1358 * by picking the smallest of the two power levels advertised. 1359 */ 1360 if (has_80211h_pwr && 1361 (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) { 1362 sdata_info(sdata, 1363 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1364 pwr_level_80211h, chan_pwr, pwr_reduction_80211h, 1365 sdata->u.mgd.bssid); 1366 new_ap_level = pwr_level_80211h; 1367 } else { /* has_cisco_pwr is always true here. */ 1368 sdata_info(sdata, 1369 "Limiting TX power to %d dBm as advertised by %pM\n", 1370 pwr_level_cisco, sdata->u.mgd.bssid); 1371 new_ap_level = pwr_level_cisco; 1372 } 1373 1374 if (sdata->ap_power_level == new_ap_level) 1375 return 0; 1376 1377 sdata->ap_power_level = new_ap_level; 1378 if (__ieee80211_recalc_txpower(sdata)) 1379 return BSS_CHANGED_TXPOWER; 1380 return 0; 1381 } 1382 1383 /* powersave */ 1384 static void ieee80211_enable_ps(struct ieee80211_local *local, 1385 struct ieee80211_sub_if_data *sdata) 1386 { 1387 struct ieee80211_conf *conf = &local->hw.conf; 1388 1389 /* 1390 * If we are scanning right now then the parameters will 1391 * take effect when scan finishes. 1392 */ 1393 if (local->scanning) 1394 return; 1395 1396 if (conf->dynamic_ps_timeout > 0 && 1397 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 1398 mod_timer(&local->dynamic_ps_timer, jiffies + 1399 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1400 } else { 1401 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1402 ieee80211_send_nullfunc(local, sdata, 1); 1403 1404 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1405 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 1406 return; 1407 1408 conf->flags |= IEEE80211_CONF_PS; 1409 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1410 } 1411 } 1412 1413 static void ieee80211_change_ps(struct ieee80211_local *local) 1414 { 1415 struct ieee80211_conf *conf = &local->hw.conf; 1416 1417 if (local->ps_sdata) { 1418 ieee80211_enable_ps(local, local->ps_sdata); 1419 } else if (conf->flags & IEEE80211_CONF_PS) { 1420 conf->flags &= ~IEEE80211_CONF_PS; 1421 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1422 del_timer_sync(&local->dynamic_ps_timer); 1423 cancel_work_sync(&local->dynamic_ps_enable_work); 1424 } 1425 } 1426 1427 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1428 { 1429 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1430 struct sta_info *sta = NULL; 1431 bool authorized = false; 1432 1433 if (!mgd->powersave) 1434 return false; 1435 1436 if (mgd->broken_ap) 1437 return false; 1438 1439 if (!mgd->associated) 1440 return false; 1441 1442 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1443 return false; 1444 1445 if (!mgd->have_beacon) 1446 return false; 1447 1448 rcu_read_lock(); 1449 sta = sta_info_get(sdata, mgd->bssid); 1450 if (sta) 1451 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1452 rcu_read_unlock(); 1453 1454 return authorized; 1455 } 1456 1457 /* need to hold RTNL or interface lock */ 1458 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 1459 { 1460 struct ieee80211_sub_if_data *sdata, *found = NULL; 1461 int count = 0; 1462 int timeout; 1463 1464 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 1465 local->ps_sdata = NULL; 1466 return; 1467 } 1468 1469 list_for_each_entry(sdata, &local->interfaces, list) { 1470 if (!ieee80211_sdata_running(sdata)) 1471 continue; 1472 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1473 /* If an AP vif is found, then disable PS 1474 * by setting the count to zero thereby setting 1475 * ps_sdata to NULL. 1476 */ 1477 count = 0; 1478 break; 1479 } 1480 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1481 continue; 1482 found = sdata; 1483 count++; 1484 } 1485 1486 if (count == 1 && ieee80211_powersave_allowed(found)) { 1487 s32 beaconint_us; 1488 1489 if (latency < 0) 1490 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 1491 1492 beaconint_us = ieee80211_tu_to_usec( 1493 found->vif.bss_conf.beacon_int); 1494 1495 timeout = local->dynamic_ps_forced_timeout; 1496 if (timeout < 0) { 1497 /* 1498 * Go to full PSM if the user configures a very low 1499 * latency requirement. 1500 * The 2000 second value is there for compatibility 1501 * until the PM_QOS_NETWORK_LATENCY is configured 1502 * with real values. 1503 */ 1504 if (latency > (1900 * USEC_PER_MSEC) && 1505 latency != (2000 * USEC_PER_SEC)) 1506 timeout = 0; 1507 else 1508 timeout = 100; 1509 } 1510 local->hw.conf.dynamic_ps_timeout = timeout; 1511 1512 if (beaconint_us > latency) { 1513 local->ps_sdata = NULL; 1514 } else { 1515 int maxslp = 1; 1516 u8 dtimper = found->u.mgd.dtim_period; 1517 1518 /* If the TIM IE is invalid, pretend the value is 1 */ 1519 if (!dtimper) 1520 dtimper = 1; 1521 else if (dtimper > 1) 1522 maxslp = min_t(int, dtimper, 1523 latency / beaconint_us); 1524 1525 local->hw.conf.max_sleep_period = maxslp; 1526 local->hw.conf.ps_dtim_period = dtimper; 1527 local->ps_sdata = found; 1528 } 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 ((local->hw.flags & IEEE80211_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, 1); 1618 /* Flush to get the tx status of nullfunc frame */ 1619 ieee80211_flush_queues(local, sdata, false); 1620 } 1621 } 1622 1623 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 1624 (local->hw.flags & IEEE80211_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 if (local->quiescing || local->suspended) 1637 return; 1638 1639 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1640 } 1641 1642 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1643 { 1644 struct delayed_work *delayed_work = 1645 container_of(work, struct delayed_work, work); 1646 struct ieee80211_sub_if_data *sdata = 1647 container_of(delayed_work, struct ieee80211_sub_if_data, 1648 dfs_cac_timer_work); 1649 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1650 1651 mutex_lock(&sdata->local->mtx); 1652 if (sdata->wdev.cac_started) { 1653 ieee80211_vif_release_channel(sdata); 1654 cfg80211_cac_event(sdata->dev, &chandef, 1655 NL80211_RADAR_CAC_FINISHED, 1656 GFP_KERNEL); 1657 } 1658 mutex_unlock(&sdata->local->mtx); 1659 } 1660 1661 static bool 1662 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1663 { 1664 struct ieee80211_local *local = sdata->local; 1665 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1666 bool ret = false; 1667 int ac; 1668 1669 if (local->hw.queues < IEEE80211_NUM_ACS) 1670 return false; 1671 1672 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1673 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 1674 int non_acm_ac; 1675 unsigned long now = jiffies; 1676 1677 if (tx_tspec->action == TX_TSPEC_ACTION_NONE && 1678 tx_tspec->admitted_time && 1679 time_after(now, tx_tspec->time_slice_start + HZ)) { 1680 tx_tspec->consumed_tx_time = 0; 1681 tx_tspec->time_slice_start = now; 1682 1683 if (tx_tspec->downgraded) 1684 tx_tspec->action = 1685 TX_TSPEC_ACTION_STOP_DOWNGRADE; 1686 } 1687 1688 switch (tx_tspec->action) { 1689 case TX_TSPEC_ACTION_STOP_DOWNGRADE: 1690 /* take the original parameters */ 1691 if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac])) 1692 sdata_err(sdata, 1693 "failed to set TX queue parameters for queue %d\n", 1694 ac); 1695 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1696 tx_tspec->downgraded = false; 1697 ret = true; 1698 break; 1699 case TX_TSPEC_ACTION_DOWNGRADE: 1700 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 1701 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1702 ret = true; 1703 break; 1704 } 1705 /* downgrade next lower non-ACM AC */ 1706 for (non_acm_ac = ac + 1; 1707 non_acm_ac < IEEE80211_NUM_ACS; 1708 non_acm_ac++) 1709 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac))) 1710 break; 1711 /* The loop will result in using BK even if it requires 1712 * admission control, such configuration makes no sense 1713 * and we have to transmit somehow - the AC selection 1714 * does the same thing. 1715 */ 1716 if (drv_conf_tx(local, sdata, ac, 1717 &sdata->tx_conf[non_acm_ac])) 1718 sdata_err(sdata, 1719 "failed to set TX queue parameters for queue %d\n", 1720 ac); 1721 tx_tspec->action = TX_TSPEC_ACTION_NONE; 1722 ret = true; 1723 schedule_delayed_work(&ifmgd->tx_tspec_wk, 1724 tx_tspec->time_slice_start + HZ - now + 1); 1725 break; 1726 case TX_TSPEC_ACTION_NONE: 1727 /* nothing now */ 1728 break; 1729 } 1730 } 1731 1732 return ret; 1733 } 1734 1735 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata) 1736 { 1737 if (__ieee80211_sta_handle_tspec_ac_params(sdata)) 1738 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 1739 } 1740 1741 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work) 1742 { 1743 struct ieee80211_sub_if_data *sdata; 1744 1745 sdata = container_of(work, struct ieee80211_sub_if_data, 1746 u.mgd.tx_tspec_wk.work); 1747 ieee80211_sta_handle_tspec_ac_params(sdata); 1748 } 1749 1750 /* MLME */ 1751 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1752 struct ieee80211_sub_if_data *sdata, 1753 const u8 *wmm_param, size_t wmm_param_len) 1754 { 1755 struct ieee80211_tx_queue_params params; 1756 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1757 size_t left; 1758 int count; 1759 const u8 *pos; 1760 u8 uapsd_queues = 0; 1761 1762 if (!local->ops->conf_tx) 1763 return false; 1764 1765 if (local->hw.queues < IEEE80211_NUM_ACS) 1766 return false; 1767 1768 if (!wmm_param) 1769 return false; 1770 1771 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1772 return false; 1773 1774 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1775 uapsd_queues = ifmgd->uapsd_queues; 1776 1777 count = wmm_param[6] & 0x0f; 1778 if (count == ifmgd->wmm_last_param_set) 1779 return false; 1780 ifmgd->wmm_last_param_set = count; 1781 1782 pos = wmm_param + 8; 1783 left = wmm_param_len - 8; 1784 1785 memset(¶ms, 0, sizeof(params)); 1786 1787 sdata->wmm_acm = 0; 1788 for (; left >= 4; left -= 4, pos += 4) { 1789 int aci = (pos[0] >> 5) & 0x03; 1790 int acm = (pos[0] >> 4) & 0x01; 1791 bool uapsd = false; 1792 int queue; 1793 1794 switch (aci) { 1795 case 1: /* AC_BK */ 1796 queue = 3; 1797 if (acm) 1798 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1799 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1800 uapsd = true; 1801 break; 1802 case 2: /* AC_VI */ 1803 queue = 1; 1804 if (acm) 1805 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1806 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1807 uapsd = true; 1808 break; 1809 case 3: /* AC_VO */ 1810 queue = 0; 1811 if (acm) 1812 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1813 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1814 uapsd = true; 1815 break; 1816 case 0: /* AC_BE */ 1817 default: 1818 queue = 2; 1819 if (acm) 1820 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1821 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1822 uapsd = true; 1823 break; 1824 } 1825 1826 params.aifs = pos[0] & 0x0f; 1827 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1828 params.cw_min = ecw2cw(pos[1] & 0x0f); 1829 params.txop = get_unaligned_le16(pos + 2); 1830 params.acm = acm; 1831 params.uapsd = uapsd; 1832 1833 mlme_dbg(sdata, 1834 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n", 1835 queue, aci, acm, 1836 params.aifs, params.cw_min, params.cw_max, 1837 params.txop, params.uapsd, 1838 ifmgd->tx_tspec[queue].downgraded); 1839 sdata->tx_conf[queue] = params; 1840 if (!ifmgd->tx_tspec[queue].downgraded && 1841 drv_conf_tx(local, sdata, queue, ¶ms)) 1842 sdata_err(sdata, 1843 "failed to set TX queue parameters for queue %d\n", 1844 queue); 1845 } 1846 1847 /* enable WMM or activate new settings */ 1848 sdata->vif.bss_conf.qos = true; 1849 return true; 1850 } 1851 1852 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1853 { 1854 lockdep_assert_held(&sdata->local->mtx); 1855 1856 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1857 ieee80211_run_deferred_scan(sdata->local); 1858 } 1859 1860 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1861 { 1862 mutex_lock(&sdata->local->mtx); 1863 __ieee80211_stop_poll(sdata); 1864 mutex_unlock(&sdata->local->mtx); 1865 } 1866 1867 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1868 u16 capab, bool erp_valid, u8 erp) 1869 { 1870 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1871 u32 changed = 0; 1872 bool use_protection; 1873 bool use_short_preamble; 1874 bool use_short_slot; 1875 1876 if (erp_valid) { 1877 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1878 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1879 } else { 1880 use_protection = false; 1881 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1882 } 1883 1884 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1885 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1886 use_short_slot = true; 1887 1888 if (use_protection != bss_conf->use_cts_prot) { 1889 bss_conf->use_cts_prot = use_protection; 1890 changed |= BSS_CHANGED_ERP_CTS_PROT; 1891 } 1892 1893 if (use_short_preamble != bss_conf->use_short_preamble) { 1894 bss_conf->use_short_preamble = use_short_preamble; 1895 changed |= BSS_CHANGED_ERP_PREAMBLE; 1896 } 1897 1898 if (use_short_slot != bss_conf->use_short_slot) { 1899 bss_conf->use_short_slot = use_short_slot; 1900 changed |= BSS_CHANGED_ERP_SLOT; 1901 } 1902 1903 return changed; 1904 } 1905 1906 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1907 struct cfg80211_bss *cbss, 1908 u32 bss_info_changed) 1909 { 1910 struct ieee80211_bss *bss = (void *)cbss->priv; 1911 struct ieee80211_local *local = sdata->local; 1912 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1913 1914 bss_info_changed |= BSS_CHANGED_ASSOC; 1915 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1916 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1917 1918 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1919 beacon_loss_count * bss_conf->beacon_int)); 1920 1921 sdata->u.mgd.associated = cbss; 1922 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1923 1924 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1925 1926 if (sdata->vif.p2p) { 1927 const struct cfg80211_bss_ies *ies; 1928 1929 rcu_read_lock(); 1930 ies = rcu_dereference(cbss->ies); 1931 if (ies) { 1932 int ret; 1933 1934 ret = cfg80211_get_p2p_attr( 1935 ies->data, ies->len, 1936 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1937 (u8 *) &bss_conf->p2p_noa_attr, 1938 sizeof(bss_conf->p2p_noa_attr)); 1939 if (ret >= 2) { 1940 sdata->u.mgd.p2p_noa_index = 1941 bss_conf->p2p_noa_attr.index; 1942 bss_info_changed |= BSS_CHANGED_P2P_PS; 1943 } 1944 } 1945 rcu_read_unlock(); 1946 } 1947 1948 /* just to be sure */ 1949 ieee80211_stop_poll(sdata); 1950 1951 ieee80211_led_assoc(local, 1); 1952 1953 if (sdata->u.mgd.have_beacon) { 1954 /* 1955 * If the AP is buggy we may get here with no DTIM period 1956 * known, so assume it's 1 which is the only safe assumption 1957 * in that case, although if the TIM IE is broken powersave 1958 * probably just won't work at all. 1959 */ 1960 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1961 bss_conf->beacon_rate = bss->beacon_rate; 1962 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1963 } else { 1964 bss_conf->beacon_rate = NULL; 1965 bss_conf->dtim_period = 0; 1966 } 1967 1968 bss_conf->assoc = 1; 1969 1970 /* Tell the driver to monitor connection quality (if supported) */ 1971 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1972 bss_conf->cqm_rssi_thold) 1973 bss_info_changed |= BSS_CHANGED_CQM; 1974 1975 /* Enable ARP filtering */ 1976 if (bss_conf->arp_addr_cnt) 1977 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1978 1979 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1980 1981 mutex_lock(&local->iflist_mtx); 1982 ieee80211_recalc_ps(local, -1); 1983 mutex_unlock(&local->iflist_mtx); 1984 1985 ieee80211_recalc_smps(sdata); 1986 ieee80211_recalc_ps_vif(sdata); 1987 1988 netif_carrier_on(sdata->dev); 1989 } 1990 1991 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1992 u16 stype, u16 reason, bool tx, 1993 u8 *frame_buf) 1994 { 1995 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1996 struct ieee80211_local *local = sdata->local; 1997 u32 changed = 0; 1998 1999 sdata_assert_lock(sdata); 2000 2001 if (WARN_ON_ONCE(tx && !frame_buf)) 2002 return; 2003 2004 if (WARN_ON(!ifmgd->associated)) 2005 return; 2006 2007 ieee80211_stop_poll(sdata); 2008 2009 ifmgd->associated = NULL; 2010 netif_carrier_off(sdata->dev); 2011 2012 /* 2013 * if we want to get out of ps before disassoc (why?) we have 2014 * to do it before sending disassoc, as otherwise the null-packet 2015 * won't be valid. 2016 */ 2017 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2018 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2019 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2020 } 2021 local->ps_sdata = NULL; 2022 2023 /* disable per-vif ps */ 2024 ieee80211_recalc_ps_vif(sdata); 2025 2026 /* make sure ongoing transmission finishes */ 2027 synchronize_net(); 2028 2029 /* 2030 * drop any frame before deauth/disassoc, this can be data or 2031 * management frame. Since we are disconnecting, we should not 2032 * insist sending these frames which can take time and delay 2033 * the disconnection and possible the roaming. 2034 */ 2035 if (tx) 2036 ieee80211_flush_queues(local, sdata, true); 2037 2038 /* deauthenticate/disassociate now */ 2039 if (tx || frame_buf) 2040 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 2041 reason, tx, frame_buf); 2042 2043 /* flush out frame - make sure the deauth was actually sent */ 2044 if (tx) 2045 ieee80211_flush_queues(local, sdata, false); 2046 2047 /* clear bssid only after building the needed mgmt frames */ 2048 memset(ifmgd->bssid, 0, ETH_ALEN); 2049 2050 /* remove AP and TDLS peers */ 2051 sta_info_flush(sdata); 2052 2053 /* finally reset all BSS / config parameters */ 2054 changed |= ieee80211_reset_erp_info(sdata); 2055 2056 ieee80211_led_assoc(local, 0); 2057 changed |= BSS_CHANGED_ASSOC; 2058 sdata->vif.bss_conf.assoc = false; 2059 2060 ifmgd->p2p_noa_index = -1; 2061 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 2062 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 2063 2064 /* on the next assoc, re-program HT/VHT parameters */ 2065 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 2066 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 2067 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 2068 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 2069 2070 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 2071 2072 del_timer_sync(&local->dynamic_ps_timer); 2073 cancel_work_sync(&local->dynamic_ps_enable_work); 2074 2075 /* Disable ARP filtering */ 2076 if (sdata->vif.bss_conf.arp_addr_cnt) 2077 changed |= BSS_CHANGED_ARP_FILTER; 2078 2079 sdata->vif.bss_conf.qos = false; 2080 changed |= BSS_CHANGED_QOS; 2081 2082 /* The BSSID (not really interesting) and HT changed */ 2083 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 2084 ieee80211_bss_info_change_notify(sdata, changed); 2085 2086 /* disassociated - set to defaults now */ 2087 ieee80211_set_wmm_default(sdata, false); 2088 2089 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 2090 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 2091 del_timer_sync(&sdata->u.mgd.timer); 2092 del_timer_sync(&sdata->u.mgd.chswitch_timer); 2093 2094 sdata->vif.bss_conf.dtim_period = 0; 2095 sdata->vif.bss_conf.beacon_rate = NULL; 2096 2097 ifmgd->have_beacon = false; 2098 2099 ifmgd->flags = 0; 2100 mutex_lock(&local->mtx); 2101 ieee80211_vif_release_channel(sdata); 2102 2103 sdata->vif.csa_active = false; 2104 ifmgd->csa_waiting_bcn = false; 2105 ifmgd->csa_ignored_same_chan = false; 2106 if (sdata->csa_block_tx) { 2107 ieee80211_wake_vif_queues(local, sdata, 2108 IEEE80211_QUEUE_STOP_REASON_CSA); 2109 sdata->csa_block_tx = false; 2110 } 2111 mutex_unlock(&local->mtx); 2112 2113 /* existing TX TSPEC sessions no longer exist */ 2114 memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec)); 2115 cancel_delayed_work_sync(&ifmgd->tx_tspec_wk); 2116 2117 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 2118 } 2119 2120 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 2121 struct ieee80211_hdr *hdr) 2122 { 2123 /* 2124 * We can postpone the mgd.timer whenever receiving unicast frames 2125 * from AP because we know that the connection is working both ways 2126 * at that time. But multicast frames (and hence also beacons) must 2127 * be ignored here, because we need to trigger the timer during 2128 * data idle periods for sending the periodic probe request to the 2129 * AP we're connected to. 2130 */ 2131 if (is_multicast_ether_addr(hdr->addr1)) 2132 return; 2133 2134 ieee80211_sta_reset_conn_monitor(sdata); 2135 } 2136 2137 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 2138 { 2139 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2140 struct ieee80211_local *local = sdata->local; 2141 2142 mutex_lock(&local->mtx); 2143 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 2144 goto out; 2145 2146 __ieee80211_stop_poll(sdata); 2147 2148 mutex_lock(&local->iflist_mtx); 2149 ieee80211_recalc_ps(local, -1); 2150 mutex_unlock(&local->iflist_mtx); 2151 2152 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 2153 goto out; 2154 2155 /* 2156 * We've received a probe response, but are not sure whether 2157 * we have or will be receiving any beacons or data, so let's 2158 * schedule the timers again, just in case. 2159 */ 2160 ieee80211_sta_reset_beacon_monitor(sdata); 2161 2162 mod_timer(&ifmgd->conn_mon_timer, 2163 round_jiffies_up(jiffies + 2164 IEEE80211_CONNECTION_IDLE_TIME)); 2165 out: 2166 mutex_unlock(&local->mtx); 2167 } 2168 2169 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, 2170 struct ieee80211_hdr *hdr, 2171 u16 tx_time) 2172 { 2173 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2174 u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 2175 int ac = ieee80211_ac_from_tid(tid); 2176 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; 2177 unsigned long now = jiffies; 2178 2179 if (likely(!tx_tspec->admitted_time)) 2180 return; 2181 2182 if (time_after(now, tx_tspec->time_slice_start + HZ)) { 2183 tx_tspec->consumed_tx_time = 0; 2184 tx_tspec->time_slice_start = now; 2185 2186 if (tx_tspec->downgraded) { 2187 tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE; 2188 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2189 } 2190 } 2191 2192 if (tx_tspec->downgraded) 2193 return; 2194 2195 tx_tspec->consumed_tx_time += tx_time; 2196 2197 if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) { 2198 tx_tspec->downgraded = true; 2199 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE; 2200 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0); 2201 } 2202 } 2203 2204 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 2205 struct ieee80211_hdr *hdr, bool ack, u16 tx_time) 2206 { 2207 ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time); 2208 2209 if (!ieee80211_is_data(hdr->frame_control)) 2210 return; 2211 2212 if (ieee80211_is_nullfunc(hdr->frame_control) && 2213 sdata->u.mgd.probe_send_count > 0) { 2214 if (ack) 2215 ieee80211_sta_reset_conn_monitor(sdata); 2216 else 2217 sdata->u.mgd.nullfunc_failed = true; 2218 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 2219 return; 2220 } 2221 2222 if (ack) 2223 ieee80211_sta_reset_conn_monitor(sdata); 2224 } 2225 2226 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 2227 { 2228 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2229 const u8 *ssid; 2230 u8 *dst = ifmgd->associated->bssid; 2231 u8 unicast_limit = max(1, max_probe_tries - 3); 2232 2233 /* 2234 * Try sending broadcast probe requests for the last three 2235 * probe requests after the first ones failed since some 2236 * buggy APs only support broadcast probe requests. 2237 */ 2238 if (ifmgd->probe_send_count >= unicast_limit) 2239 dst = NULL; 2240 2241 /* 2242 * When the hardware reports an accurate Tx ACK status, it's 2243 * better to send a nullfunc frame instead of a probe request, 2244 * as it will kick us off the AP quickly if we aren't associated 2245 * anymore. The timeout will be reset if the frame is ACKed by 2246 * the AP. 2247 */ 2248 ifmgd->probe_send_count++; 2249 2250 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 2251 ifmgd->nullfunc_failed = false; 2252 ieee80211_send_nullfunc(sdata->local, sdata, 0); 2253 } else { 2254 int ssid_len; 2255 2256 rcu_read_lock(); 2257 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 2258 if (WARN_ON_ONCE(ssid == NULL)) 2259 ssid_len = 0; 2260 else 2261 ssid_len = ssid[1]; 2262 2263 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL, 2264 ssid + 2, ssid_len, NULL, 2265 0, (u32) -1, true, 0, 2266 ifmgd->associated->channel, false); 2267 rcu_read_unlock(); 2268 } 2269 2270 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 2271 run_again(sdata, ifmgd->probe_timeout); 2272 } 2273 2274 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 2275 bool beacon) 2276 { 2277 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2278 bool already = false; 2279 2280 if (!ieee80211_sdata_running(sdata)) 2281 return; 2282 2283 sdata_lock(sdata); 2284 2285 if (!ifmgd->associated) 2286 goto out; 2287 2288 mutex_lock(&sdata->local->mtx); 2289 2290 if (sdata->local->tmp_channel || sdata->local->scanning) { 2291 mutex_unlock(&sdata->local->mtx); 2292 goto out; 2293 } 2294 2295 if (beacon) { 2296 mlme_dbg_ratelimited(sdata, 2297 "detected beacon loss from AP (missed %d beacons) - probing\n", 2298 beacon_loss_count); 2299 2300 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL); 2301 } 2302 2303 /* 2304 * The driver/our work has already reported this event or the 2305 * connection monitoring has kicked in and we have already sent 2306 * a probe request. Or maybe the AP died and the driver keeps 2307 * reporting until we disassociate... 2308 * 2309 * In either case we have to ignore the current call to this 2310 * function (except for setting the correct probe reason bit) 2311 * because otherwise we would reset the timer every time and 2312 * never check whether we received a probe response! 2313 */ 2314 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 2315 already = true; 2316 2317 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2318 2319 mutex_unlock(&sdata->local->mtx); 2320 2321 if (already) 2322 goto out; 2323 2324 mutex_lock(&sdata->local->iflist_mtx); 2325 ieee80211_recalc_ps(sdata->local, -1); 2326 mutex_unlock(&sdata->local->iflist_mtx); 2327 2328 ifmgd->probe_send_count = 0; 2329 ieee80211_mgd_probe_ap_send(sdata); 2330 out: 2331 sdata_unlock(sdata); 2332 } 2333 2334 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2335 struct ieee80211_vif *vif) 2336 { 2337 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2338 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2339 struct cfg80211_bss *cbss; 2340 struct sk_buff *skb; 2341 const u8 *ssid; 2342 int ssid_len; 2343 2344 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2345 return NULL; 2346 2347 sdata_assert_lock(sdata); 2348 2349 if (ifmgd->associated) 2350 cbss = ifmgd->associated; 2351 else if (ifmgd->auth_data) 2352 cbss = ifmgd->auth_data->bss; 2353 else if (ifmgd->assoc_data) 2354 cbss = ifmgd->assoc_data->bss; 2355 else 2356 return NULL; 2357 2358 rcu_read_lock(); 2359 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2360 if (WARN_ON_ONCE(ssid == NULL)) 2361 ssid_len = 0; 2362 else 2363 ssid_len = ssid[1]; 2364 2365 skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid, 2366 (u32) -1, cbss->channel, 2367 ssid + 2, ssid_len, 2368 NULL, 0, true); 2369 rcu_read_unlock(); 2370 2371 return skb; 2372 } 2373 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2374 2375 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2376 { 2377 struct ieee80211_local *local = sdata->local; 2378 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2379 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2380 2381 sdata_lock(sdata); 2382 if (!ifmgd->associated) { 2383 sdata_unlock(sdata); 2384 return; 2385 } 2386 2387 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2388 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2389 true, frame_buf); 2390 mutex_lock(&local->mtx); 2391 sdata->vif.csa_active = false; 2392 ifmgd->csa_waiting_bcn = false; 2393 if (sdata->csa_block_tx) { 2394 ieee80211_wake_vif_queues(local, sdata, 2395 IEEE80211_QUEUE_STOP_REASON_CSA); 2396 sdata->csa_block_tx = false; 2397 } 2398 mutex_unlock(&local->mtx); 2399 2400 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 2401 IEEE80211_DEAUTH_FRAME_LEN); 2402 sdata_unlock(sdata); 2403 } 2404 2405 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2406 { 2407 struct ieee80211_sub_if_data *sdata = 2408 container_of(work, struct ieee80211_sub_if_data, 2409 u.mgd.beacon_connection_loss_work); 2410 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2411 struct sta_info *sta; 2412 2413 if (ifmgd->associated) { 2414 rcu_read_lock(); 2415 sta = sta_info_get(sdata, ifmgd->bssid); 2416 if (sta) 2417 sta->beacon_loss_count++; 2418 rcu_read_unlock(); 2419 } 2420 2421 if (ifmgd->connection_loss) { 2422 sdata_info(sdata, "Connection to AP %pM lost\n", 2423 ifmgd->bssid); 2424 __ieee80211_disconnect(sdata); 2425 } else { 2426 ieee80211_mgd_probe_ap(sdata, true); 2427 } 2428 } 2429 2430 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2431 { 2432 struct ieee80211_sub_if_data *sdata = 2433 container_of(work, struct ieee80211_sub_if_data, 2434 u.mgd.csa_connection_drop_work); 2435 2436 __ieee80211_disconnect(sdata); 2437 } 2438 2439 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2440 { 2441 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2442 struct ieee80211_hw *hw = &sdata->local->hw; 2443 2444 trace_api_beacon_loss(sdata); 2445 2446 sdata->u.mgd.connection_loss = false; 2447 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2448 } 2449 EXPORT_SYMBOL(ieee80211_beacon_loss); 2450 2451 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2452 { 2453 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2454 struct ieee80211_hw *hw = &sdata->local->hw; 2455 2456 trace_api_connection_loss(sdata); 2457 2458 sdata->u.mgd.connection_loss = true; 2459 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2460 } 2461 EXPORT_SYMBOL(ieee80211_connection_loss); 2462 2463 2464 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2465 bool assoc) 2466 { 2467 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2468 2469 sdata_assert_lock(sdata); 2470 2471 if (!assoc) { 2472 /* 2473 * we are not authenticated yet, the only timer that could be 2474 * running is the timeout for the authentication response which 2475 * which is not relevant anymore. 2476 */ 2477 del_timer_sync(&sdata->u.mgd.timer); 2478 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2479 2480 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2481 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2482 sdata->u.mgd.flags = 0; 2483 mutex_lock(&sdata->local->mtx); 2484 ieee80211_vif_release_channel(sdata); 2485 mutex_unlock(&sdata->local->mtx); 2486 } 2487 2488 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2489 kfree(auth_data); 2490 sdata->u.mgd.auth_data = NULL; 2491 } 2492 2493 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2494 struct ieee80211_mgmt *mgmt, size_t len) 2495 { 2496 struct ieee80211_local *local = sdata->local; 2497 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2498 u8 *pos; 2499 struct ieee802_11_elems elems; 2500 u32 tx_flags = 0; 2501 2502 pos = mgmt->u.auth.variable; 2503 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2504 if (!elems.challenge) 2505 return; 2506 auth_data->expected_transaction = 4; 2507 drv_mgd_prepare_tx(sdata->local, sdata); 2508 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2509 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2510 IEEE80211_TX_INTFL_MLME_CONN_TX; 2511 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2512 elems.challenge - 2, elems.challenge_len + 2, 2513 auth_data->bss->bssid, auth_data->bss->bssid, 2514 auth_data->key, auth_data->key_len, 2515 auth_data->key_idx, tx_flags); 2516 } 2517 2518 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2519 struct ieee80211_mgmt *mgmt, size_t len) 2520 { 2521 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2522 u8 bssid[ETH_ALEN]; 2523 u16 auth_alg, auth_transaction, status_code; 2524 struct sta_info *sta; 2525 2526 sdata_assert_lock(sdata); 2527 2528 if (len < 24 + 6) 2529 return; 2530 2531 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2532 return; 2533 2534 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2535 2536 if (!ether_addr_equal(bssid, mgmt->bssid)) 2537 return; 2538 2539 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2540 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2541 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2542 2543 if (auth_alg != ifmgd->auth_data->algorithm || 2544 auth_transaction != ifmgd->auth_data->expected_transaction) { 2545 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2546 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2547 auth_transaction, 2548 ifmgd->auth_data->expected_transaction); 2549 return; 2550 } 2551 2552 if (status_code != WLAN_STATUS_SUCCESS) { 2553 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2554 mgmt->sa, status_code); 2555 ieee80211_destroy_auth_data(sdata, false); 2556 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2557 return; 2558 } 2559 2560 switch (ifmgd->auth_data->algorithm) { 2561 case WLAN_AUTH_OPEN: 2562 case WLAN_AUTH_LEAP: 2563 case WLAN_AUTH_FT: 2564 case WLAN_AUTH_SAE: 2565 break; 2566 case WLAN_AUTH_SHARED_KEY: 2567 if (ifmgd->auth_data->expected_transaction != 4) { 2568 ieee80211_auth_challenge(sdata, mgmt, len); 2569 /* need another frame */ 2570 return; 2571 } 2572 break; 2573 default: 2574 WARN_ONCE(1, "invalid auth alg %d", 2575 ifmgd->auth_data->algorithm); 2576 return; 2577 } 2578 2579 sdata_info(sdata, "authenticated\n"); 2580 ifmgd->auth_data->done = true; 2581 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2582 ifmgd->auth_data->timeout_started = true; 2583 run_again(sdata, ifmgd->auth_data->timeout); 2584 2585 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2586 ifmgd->auth_data->expected_transaction != 2) { 2587 /* 2588 * Report auth frame to user space for processing since another 2589 * round of Authentication frames is still needed. 2590 */ 2591 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2592 return; 2593 } 2594 2595 /* move station state to auth */ 2596 mutex_lock(&sdata->local->sta_mtx); 2597 sta = sta_info_get(sdata, bssid); 2598 if (!sta) { 2599 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2600 goto out_err; 2601 } 2602 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2603 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2604 goto out_err; 2605 } 2606 mutex_unlock(&sdata->local->sta_mtx); 2607 2608 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2609 return; 2610 out_err: 2611 mutex_unlock(&sdata->local->sta_mtx); 2612 /* ignore frame -- wait for timeout */ 2613 } 2614 2615 #define case_WLAN(type) \ 2616 case WLAN_REASON_##type: return #type 2617 2618 static const char *ieee80211_get_reason_code_string(u16 reason_code) 2619 { 2620 switch (reason_code) { 2621 case_WLAN(UNSPECIFIED); 2622 case_WLAN(PREV_AUTH_NOT_VALID); 2623 case_WLAN(DEAUTH_LEAVING); 2624 case_WLAN(DISASSOC_DUE_TO_INACTIVITY); 2625 case_WLAN(DISASSOC_AP_BUSY); 2626 case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA); 2627 case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA); 2628 case_WLAN(DISASSOC_STA_HAS_LEFT); 2629 case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH); 2630 case_WLAN(DISASSOC_BAD_POWER); 2631 case_WLAN(DISASSOC_BAD_SUPP_CHAN); 2632 case_WLAN(INVALID_IE); 2633 case_WLAN(MIC_FAILURE); 2634 case_WLAN(4WAY_HANDSHAKE_TIMEOUT); 2635 case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT); 2636 case_WLAN(IE_DIFFERENT); 2637 case_WLAN(INVALID_GROUP_CIPHER); 2638 case_WLAN(INVALID_PAIRWISE_CIPHER); 2639 case_WLAN(INVALID_AKMP); 2640 case_WLAN(UNSUPP_RSN_VERSION); 2641 case_WLAN(INVALID_RSN_IE_CAP); 2642 case_WLAN(IEEE8021X_FAILED); 2643 case_WLAN(CIPHER_SUITE_REJECTED); 2644 case_WLAN(DISASSOC_UNSPECIFIED_QOS); 2645 case_WLAN(DISASSOC_QAP_NO_BANDWIDTH); 2646 case_WLAN(DISASSOC_LOW_ACK); 2647 case_WLAN(DISASSOC_QAP_EXCEED_TXOP); 2648 case_WLAN(QSTA_LEAVE_QBSS); 2649 case_WLAN(QSTA_NOT_USE); 2650 case_WLAN(QSTA_REQUIRE_SETUP); 2651 case_WLAN(QSTA_TIMEOUT); 2652 case_WLAN(QSTA_CIPHER_NOT_SUPP); 2653 case_WLAN(MESH_PEER_CANCELED); 2654 case_WLAN(MESH_MAX_PEERS); 2655 case_WLAN(MESH_CONFIG); 2656 case_WLAN(MESH_CLOSE); 2657 case_WLAN(MESH_MAX_RETRIES); 2658 case_WLAN(MESH_CONFIRM_TIMEOUT); 2659 case_WLAN(MESH_INVALID_GTK); 2660 case_WLAN(MESH_INCONSISTENT_PARAM); 2661 case_WLAN(MESH_INVALID_SECURITY); 2662 case_WLAN(MESH_PATH_ERROR); 2663 case_WLAN(MESH_PATH_NOFORWARD); 2664 case_WLAN(MESH_PATH_DEST_UNREACHABLE); 2665 case_WLAN(MAC_EXISTS_IN_MBSS); 2666 case_WLAN(MESH_CHAN_REGULATORY); 2667 case_WLAN(MESH_CHAN); 2668 default: return "<unknown>"; 2669 } 2670 } 2671 2672 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2673 struct ieee80211_mgmt *mgmt, size_t len) 2674 { 2675 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2676 const u8 *bssid = NULL; 2677 u16 reason_code; 2678 2679 sdata_assert_lock(sdata); 2680 2681 if (len < 24 + 2) 2682 return; 2683 2684 if (!ifmgd->associated || 2685 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2686 return; 2687 2688 bssid = ifmgd->associated->bssid; 2689 2690 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2691 2692 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n", 2693 bssid, reason_code, ieee80211_get_reason_code_string(reason_code)); 2694 2695 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2696 2697 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2698 } 2699 2700 2701 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2702 struct ieee80211_mgmt *mgmt, size_t len) 2703 { 2704 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2705 u16 reason_code; 2706 2707 sdata_assert_lock(sdata); 2708 2709 if (len < 24 + 2) 2710 return; 2711 2712 if (!ifmgd->associated || 2713 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2714 return; 2715 2716 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2717 2718 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2719 mgmt->sa, reason_code); 2720 2721 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2722 2723 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2724 } 2725 2726 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2727 u8 *supp_rates, unsigned int supp_rates_len, 2728 u32 *rates, u32 *basic_rates, 2729 bool *have_higher_than_11mbit, 2730 int *min_rate, int *min_rate_index, 2731 int shift, u32 rate_flags) 2732 { 2733 int i, j; 2734 2735 for (i = 0; i < supp_rates_len; i++) { 2736 int rate = supp_rates[i] & 0x7f; 2737 bool is_basic = !!(supp_rates[i] & 0x80); 2738 2739 if ((rate * 5 * (1 << shift)) > 110) 2740 *have_higher_than_11mbit = true; 2741 2742 /* 2743 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2744 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2745 * 2746 * Note: Even through the membership selector and the basic 2747 * rate flag share the same bit, they are not exactly 2748 * the same. 2749 */ 2750 if (!!(supp_rates[i] & 0x80) && 2751 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2752 continue; 2753 2754 for (j = 0; j < sband->n_bitrates; j++) { 2755 struct ieee80211_rate *br; 2756 int brate; 2757 2758 br = &sband->bitrates[j]; 2759 if ((rate_flags & br->flags) != rate_flags) 2760 continue; 2761 2762 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2763 if (brate == rate) { 2764 *rates |= BIT(j); 2765 if (is_basic) 2766 *basic_rates |= BIT(j); 2767 if ((rate * 5) < *min_rate) { 2768 *min_rate = rate * 5; 2769 *min_rate_index = j; 2770 } 2771 break; 2772 } 2773 } 2774 } 2775 } 2776 2777 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2778 bool assoc) 2779 { 2780 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2781 2782 sdata_assert_lock(sdata); 2783 2784 if (!assoc) { 2785 /* 2786 * we are not associated yet, the only timer that could be 2787 * running is the timeout for the association response which 2788 * which is not relevant anymore. 2789 */ 2790 del_timer_sync(&sdata->u.mgd.timer); 2791 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2792 2793 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2794 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2795 sdata->u.mgd.flags = 0; 2796 mutex_lock(&sdata->local->mtx); 2797 ieee80211_vif_release_channel(sdata); 2798 mutex_unlock(&sdata->local->mtx); 2799 } 2800 2801 kfree(assoc_data); 2802 sdata->u.mgd.assoc_data = NULL; 2803 } 2804 2805 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2806 struct cfg80211_bss *cbss, 2807 struct ieee80211_mgmt *mgmt, size_t len) 2808 { 2809 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2810 struct ieee80211_local *local = sdata->local; 2811 struct ieee80211_supported_band *sband; 2812 struct sta_info *sta; 2813 u8 *pos; 2814 u16 capab_info, aid; 2815 struct ieee802_11_elems elems; 2816 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2817 const struct cfg80211_bss_ies *bss_ies = NULL; 2818 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2819 u32 changed = 0; 2820 int err; 2821 bool ret; 2822 2823 /* AssocResp and ReassocResp have identical structure */ 2824 2825 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2826 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2827 2828 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2829 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2830 aid); 2831 aid &= ~(BIT(15) | BIT(14)); 2832 2833 ifmgd->broken_ap = false; 2834 2835 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2836 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2837 aid); 2838 aid = 0; 2839 ifmgd->broken_ap = true; 2840 } 2841 2842 pos = mgmt->u.assoc_resp.variable; 2843 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2844 2845 if (!elems.supp_rates) { 2846 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2847 return false; 2848 } 2849 2850 ifmgd->aid = aid; 2851 ifmgd->tdls_chan_switch_prohibited = 2852 elems.ext_capab && elems.ext_capab_len >= 5 && 2853 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED); 2854 2855 /* 2856 * Some APs are erroneously not including some information in their 2857 * (re)association response frames. Try to recover by using the data 2858 * from the beacon or probe response. This seems to afflict mobile 2859 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2860 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2861 */ 2862 if ((assoc_data->wmm && !elems.wmm_param) || 2863 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2864 (!elems.ht_cap_elem || !elems.ht_operation)) || 2865 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2866 (!elems.vht_cap_elem || !elems.vht_operation))) { 2867 const struct cfg80211_bss_ies *ies; 2868 struct ieee802_11_elems bss_elems; 2869 2870 rcu_read_lock(); 2871 ies = rcu_dereference(cbss->ies); 2872 if (ies) 2873 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2874 GFP_ATOMIC); 2875 rcu_read_unlock(); 2876 if (!bss_ies) 2877 return false; 2878 2879 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2880 false, &bss_elems); 2881 if (assoc_data->wmm && 2882 !elems.wmm_param && bss_elems.wmm_param) { 2883 elems.wmm_param = bss_elems.wmm_param; 2884 sdata_info(sdata, 2885 "AP bug: WMM param missing from AssocResp\n"); 2886 } 2887 2888 /* 2889 * Also check if we requested HT/VHT, otherwise the AP doesn't 2890 * have to include the IEs in the (re)association response. 2891 */ 2892 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2893 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2894 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2895 sdata_info(sdata, 2896 "AP bug: HT capability missing from AssocResp\n"); 2897 } 2898 if (!elems.ht_operation && bss_elems.ht_operation && 2899 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2900 elems.ht_operation = bss_elems.ht_operation; 2901 sdata_info(sdata, 2902 "AP bug: HT operation missing from AssocResp\n"); 2903 } 2904 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2905 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2906 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2907 sdata_info(sdata, 2908 "AP bug: VHT capa missing from AssocResp\n"); 2909 } 2910 if (!elems.vht_operation && bss_elems.vht_operation && 2911 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2912 elems.vht_operation = bss_elems.vht_operation; 2913 sdata_info(sdata, 2914 "AP bug: VHT operation missing from AssocResp\n"); 2915 } 2916 } 2917 2918 /* 2919 * We previously checked these in the beacon/probe response, so 2920 * they should be present here. This is just a safety net. 2921 */ 2922 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2923 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2924 sdata_info(sdata, 2925 "HT AP is missing WMM params or HT capability/operation\n"); 2926 ret = false; 2927 goto out; 2928 } 2929 2930 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2931 (!elems.vht_cap_elem || !elems.vht_operation)) { 2932 sdata_info(sdata, 2933 "VHT AP is missing VHT capability/operation\n"); 2934 ret = false; 2935 goto out; 2936 } 2937 2938 mutex_lock(&sdata->local->sta_mtx); 2939 /* 2940 * station info was already allocated and inserted before 2941 * the association and should be available to us 2942 */ 2943 sta = sta_info_get(sdata, cbss->bssid); 2944 if (WARN_ON(!sta)) { 2945 mutex_unlock(&sdata->local->sta_mtx); 2946 ret = false; 2947 goto out; 2948 } 2949 2950 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2951 2952 /* Set up internal HT/VHT capabilities */ 2953 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2954 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2955 elems.ht_cap_elem, sta); 2956 2957 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 2958 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 2959 elems.vht_cap_elem, sta); 2960 2961 /* 2962 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 2963 * in their association response, so ignore that data for our own 2964 * configuration. If it changed since the last beacon, we'll get the 2965 * next beacon and update then. 2966 */ 2967 2968 /* 2969 * If an operating mode notification IE is present, override the 2970 * NSS calculation (that would be done in rate_control_rate_init()) 2971 * and use the # of streams from that element. 2972 */ 2973 if (elems.opmode_notif && 2974 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 2975 u8 nss; 2976 2977 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 2978 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 2979 nss += 1; 2980 sta->sta.rx_nss = nss; 2981 } 2982 2983 rate_control_rate_init(sta); 2984 2985 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 2986 set_sta_flag(sta, WLAN_STA_MFP); 2987 2988 sta->sta.wme = elems.wmm_param; 2989 2990 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 2991 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 2992 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 2993 if (err) { 2994 sdata_info(sdata, 2995 "failed to move station %pM to desired state\n", 2996 sta->sta.addr); 2997 WARN_ON(__sta_info_destroy(sta)); 2998 mutex_unlock(&sdata->local->sta_mtx); 2999 ret = false; 3000 goto out; 3001 } 3002 3003 mutex_unlock(&sdata->local->sta_mtx); 3004 3005 /* 3006 * Always handle WMM once after association regardless 3007 * of the first value the AP uses. Setting -1 here has 3008 * that effect because the AP values is an unsigned 3009 * 4-bit value. 3010 */ 3011 ifmgd->wmm_last_param_set = -1; 3012 3013 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param) 3014 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3015 elems.wmm_param_len); 3016 else 3017 ieee80211_set_wmm_default(sdata, false); 3018 changed |= BSS_CHANGED_QOS; 3019 3020 /* set AID and assoc capability, 3021 * ieee80211_set_associated() will tell the driver */ 3022 bss_conf->aid = aid; 3023 bss_conf->assoc_capability = capab_info; 3024 ieee80211_set_associated(sdata, cbss, changed); 3025 3026 /* 3027 * If we're using 4-addr mode, let the AP know that we're 3028 * doing so, so that it can create the STA VLAN on its side 3029 */ 3030 if (ifmgd->use_4addr) 3031 ieee80211_send_4addr_nullfunc(local, sdata); 3032 3033 /* 3034 * Start timer to probe the connection to the AP now. 3035 * Also start the timer that will detect beacon loss. 3036 */ 3037 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 3038 ieee80211_sta_reset_beacon_monitor(sdata); 3039 3040 ret = true; 3041 out: 3042 kfree(bss_ies); 3043 return ret; 3044 } 3045 3046 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 3047 struct ieee80211_mgmt *mgmt, 3048 size_t len) 3049 { 3050 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3051 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 3052 u16 capab_info, status_code, aid; 3053 struct ieee802_11_elems elems; 3054 int ac, uapsd_queues = -1; 3055 u8 *pos; 3056 bool reassoc; 3057 struct cfg80211_bss *bss; 3058 3059 sdata_assert_lock(sdata); 3060 3061 if (!assoc_data) 3062 return; 3063 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 3064 return; 3065 3066 /* 3067 * AssocResp and ReassocResp have identical structure, so process both 3068 * of them in this function. 3069 */ 3070 3071 if (len < 24 + 6) 3072 return; 3073 3074 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 3075 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 3076 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 3077 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 3078 3079 sdata_info(sdata, 3080 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 3081 reassoc ? "Rea" : "A", mgmt->sa, 3082 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 3083 3084 pos = mgmt->u.assoc_resp.variable; 3085 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 3086 3087 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 3088 elems.timeout_int && 3089 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 3090 u32 tu, ms; 3091 tu = le32_to_cpu(elems.timeout_int->value); 3092 ms = tu * 1024 / 1000; 3093 sdata_info(sdata, 3094 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 3095 mgmt->sa, tu, ms); 3096 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 3097 assoc_data->timeout_started = true; 3098 if (ms > IEEE80211_ASSOC_TIMEOUT) 3099 run_again(sdata, assoc_data->timeout); 3100 return; 3101 } 3102 3103 bss = assoc_data->bss; 3104 3105 if (status_code != WLAN_STATUS_SUCCESS) { 3106 sdata_info(sdata, "%pM denied association (code=%d)\n", 3107 mgmt->sa, status_code); 3108 ieee80211_destroy_assoc_data(sdata, false); 3109 } else { 3110 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 3111 /* oops -- internal error -- send timeout for now */ 3112 ieee80211_destroy_assoc_data(sdata, false); 3113 cfg80211_assoc_timeout(sdata->dev, bss); 3114 return; 3115 } 3116 sdata_info(sdata, "associated\n"); 3117 3118 /* 3119 * destroy assoc_data afterwards, as otherwise an idle 3120 * recalc after assoc_data is NULL but before associated 3121 * is set can cause the interface to go idle 3122 */ 3123 ieee80211_destroy_assoc_data(sdata, true); 3124 3125 /* get uapsd queues configuration */ 3126 uapsd_queues = 0; 3127 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 3128 if (sdata->tx_conf[ac].uapsd) 3129 uapsd_queues |= BIT(ac); 3130 } 3131 3132 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues); 3133 } 3134 3135 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 3136 struct ieee80211_mgmt *mgmt, size_t len, 3137 struct ieee80211_rx_status *rx_status, 3138 struct ieee802_11_elems *elems) 3139 { 3140 struct ieee80211_local *local = sdata->local; 3141 struct ieee80211_bss *bss; 3142 struct ieee80211_channel *channel; 3143 3144 sdata_assert_lock(sdata); 3145 3146 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 3147 if (!channel) 3148 return; 3149 3150 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 3151 channel); 3152 if (bss) { 3153 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 3154 ieee80211_rx_bss_put(local, bss); 3155 } 3156 } 3157 3158 3159 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 3160 struct sk_buff *skb) 3161 { 3162 struct ieee80211_mgmt *mgmt = (void *)skb->data; 3163 struct ieee80211_if_managed *ifmgd; 3164 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 3165 size_t baselen, len = skb->len; 3166 struct ieee802_11_elems elems; 3167 3168 ifmgd = &sdata->u.mgd; 3169 3170 sdata_assert_lock(sdata); 3171 3172 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 3173 return; /* ignore ProbeResp to foreign address */ 3174 3175 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 3176 if (baselen > len) 3177 return; 3178 3179 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 3180 false, &elems); 3181 3182 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3183 3184 if (ifmgd->associated && 3185 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3186 ieee80211_reset_ap_probe(sdata); 3187 3188 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && 3189 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { 3190 /* got probe response, continue with auth */ 3191 sdata_info(sdata, "direct probe responded\n"); 3192 ifmgd->auth_data->tries = 0; 3193 ifmgd->auth_data->timeout = jiffies; 3194 ifmgd->auth_data->timeout_started = true; 3195 run_again(sdata, ifmgd->auth_data->timeout); 3196 } 3197 } 3198 3199 /* 3200 * This is the canonical list of information elements we care about, 3201 * the filter code also gives us all changes to the Microsoft OUI 3202 * (00:50:F2) vendor IE which is used for WMM which we need to track, 3203 * as well as the DTPC IE (part of the Cisco OUI) used for signaling 3204 * changes to requested client power. 3205 * 3206 * We implement beacon filtering in software since that means we can 3207 * avoid processing the frame here and in cfg80211, and userspace 3208 * will not be able to tell whether the hardware supports it or not. 3209 * 3210 * XXX: This list needs to be dynamic -- userspace needs to be able to 3211 * add items it requires. It also needs to be able to tell us to 3212 * look out for other vendor IEs. 3213 */ 3214 static const u64 care_about_ies = 3215 (1ULL << WLAN_EID_COUNTRY) | 3216 (1ULL << WLAN_EID_ERP_INFO) | 3217 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 3218 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 3219 (1ULL << WLAN_EID_HT_CAPABILITY) | 3220 (1ULL << WLAN_EID_HT_OPERATION) | 3221 (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN); 3222 3223 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 3224 struct ieee80211_mgmt *mgmt, size_t len, 3225 struct ieee80211_rx_status *rx_status) 3226 { 3227 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3228 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 3229 size_t baselen; 3230 struct ieee802_11_elems elems; 3231 struct ieee80211_local *local = sdata->local; 3232 struct ieee80211_chanctx_conf *chanctx_conf; 3233 struct ieee80211_channel *chan; 3234 struct sta_info *sta; 3235 u32 changed = 0; 3236 bool erp_valid; 3237 u8 erp_value = 0; 3238 u32 ncrc; 3239 u8 *bssid; 3240 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3241 3242 sdata_assert_lock(sdata); 3243 3244 /* Process beacon from the current BSS */ 3245 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 3246 if (baselen > len) 3247 return; 3248 3249 rcu_read_lock(); 3250 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3251 if (!chanctx_conf) { 3252 rcu_read_unlock(); 3253 return; 3254 } 3255 3256 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 3257 rcu_read_unlock(); 3258 return; 3259 } 3260 chan = chanctx_conf->def.chan; 3261 rcu_read_unlock(); 3262 3263 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 3264 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 3265 ieee802_11_parse_elems(mgmt->u.beacon.variable, 3266 len - baselen, false, &elems); 3267 3268 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3269 if (elems.tim && !elems.parse_error) { 3270 const struct ieee80211_tim_ie *tim_ie = elems.tim; 3271 ifmgd->dtim_period = tim_ie->dtim_period; 3272 } 3273 ifmgd->have_beacon = true; 3274 ifmgd->assoc_data->need_beacon = false; 3275 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 3276 sdata->vif.bss_conf.sync_tsf = 3277 le64_to_cpu(mgmt->u.beacon.timestamp); 3278 sdata->vif.bss_conf.sync_device_ts = 3279 rx_status->device_timestamp; 3280 if (elems.tim) 3281 sdata->vif.bss_conf.sync_dtim_count = 3282 elems.tim->dtim_count; 3283 else 3284 sdata->vif.bss_conf.sync_dtim_count = 0; 3285 } 3286 /* continue assoc process */ 3287 ifmgd->assoc_data->timeout = jiffies; 3288 ifmgd->assoc_data->timeout_started = true; 3289 run_again(sdata, ifmgd->assoc_data->timeout); 3290 return; 3291 } 3292 3293 if (!ifmgd->associated || 3294 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 3295 return; 3296 bssid = ifmgd->associated->bssid; 3297 3298 /* Track average RSSI from the Beacon frames of the current AP */ 3299 ifmgd->last_beacon_signal = rx_status->signal; 3300 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 3301 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 3302 ifmgd->ave_beacon_signal = rx_status->signal * 16; 3303 ifmgd->last_cqm_event_signal = 0; 3304 ifmgd->count_beacon_signal = 1; 3305 ifmgd->last_ave_beacon_signal = 0; 3306 } else { 3307 ifmgd->ave_beacon_signal = 3308 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 3309 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 3310 ifmgd->ave_beacon_signal) / 16; 3311 ifmgd->count_beacon_signal++; 3312 } 3313 3314 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 3315 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 3316 int sig = ifmgd->ave_beacon_signal; 3317 int last_sig = ifmgd->last_ave_beacon_signal; 3318 3319 /* 3320 * if signal crosses either of the boundaries, invoke callback 3321 * with appropriate parameters 3322 */ 3323 if (sig > ifmgd->rssi_max_thold && 3324 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 3325 ifmgd->last_ave_beacon_signal = sig; 3326 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH); 3327 } else if (sig < ifmgd->rssi_min_thold && 3328 (last_sig >= ifmgd->rssi_max_thold || 3329 last_sig == 0)) { 3330 ifmgd->last_ave_beacon_signal = sig; 3331 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW); 3332 } 3333 } 3334 3335 if (bss_conf->cqm_rssi_thold && 3336 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 3337 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 3338 int sig = ifmgd->ave_beacon_signal / 16; 3339 int last_event = ifmgd->last_cqm_event_signal; 3340 int thold = bss_conf->cqm_rssi_thold; 3341 int hyst = bss_conf->cqm_rssi_hyst; 3342 if (sig < thold && 3343 (last_event == 0 || sig < last_event - hyst)) { 3344 ifmgd->last_cqm_event_signal = sig; 3345 ieee80211_cqm_rssi_notify( 3346 &sdata->vif, 3347 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 3348 GFP_KERNEL); 3349 } else if (sig > thold && 3350 (last_event == 0 || sig > last_event + hyst)) { 3351 ifmgd->last_cqm_event_signal = sig; 3352 ieee80211_cqm_rssi_notify( 3353 &sdata->vif, 3354 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 3355 GFP_KERNEL); 3356 } 3357 } 3358 3359 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 3360 mlme_dbg_ratelimited(sdata, 3361 "cancelling AP probe due to a received beacon\n"); 3362 ieee80211_reset_ap_probe(sdata); 3363 } 3364 3365 /* 3366 * Push the beacon loss detection into the future since 3367 * we are processing a beacon from the AP just now. 3368 */ 3369 ieee80211_sta_reset_beacon_monitor(sdata); 3370 3371 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 3372 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 3373 len - baselen, false, &elems, 3374 care_about_ies, ncrc); 3375 3376 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 3377 bool directed_tim = ieee80211_check_tim(elems.tim, 3378 elems.tim_len, 3379 ifmgd->aid); 3380 if (directed_tim) { 3381 if (local->hw.conf.dynamic_ps_timeout > 0) { 3382 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 3383 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 3384 ieee80211_hw_config(local, 3385 IEEE80211_CONF_CHANGE_PS); 3386 } 3387 ieee80211_send_nullfunc(local, sdata, 0); 3388 } else if (!local->pspolling && sdata->u.mgd.powersave) { 3389 local->pspolling = true; 3390 3391 /* 3392 * Here is assumed that the driver will be 3393 * able to send ps-poll frame and receive a 3394 * response even though power save mode is 3395 * enabled, but some drivers might require 3396 * to disable power save here. This needs 3397 * to be investigated. 3398 */ 3399 ieee80211_send_pspoll(local, sdata); 3400 } 3401 } 3402 } 3403 3404 if (sdata->vif.p2p) { 3405 struct ieee80211_p2p_noa_attr noa = {}; 3406 int ret; 3407 3408 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 3409 len - baselen, 3410 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 3411 (u8 *) &noa, sizeof(noa)); 3412 if (ret >= 2) { 3413 if (sdata->u.mgd.p2p_noa_index != noa.index) { 3414 /* valid noa_attr and index changed */ 3415 sdata->u.mgd.p2p_noa_index = noa.index; 3416 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 3417 changed |= BSS_CHANGED_P2P_PS; 3418 /* 3419 * make sure we update all information, the CRC 3420 * mechanism doesn't look at P2P attributes. 3421 */ 3422 ifmgd->beacon_crc_valid = false; 3423 } 3424 } else if (sdata->u.mgd.p2p_noa_index != -1) { 3425 /* noa_attr not found and we had valid noa_attr before */ 3426 sdata->u.mgd.p2p_noa_index = -1; 3427 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 3428 changed |= BSS_CHANGED_P2P_PS; 3429 ifmgd->beacon_crc_valid = false; 3430 } 3431 } 3432 3433 if (ifmgd->csa_waiting_bcn) 3434 ieee80211_chswitch_post_beacon(sdata); 3435 3436 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 3437 return; 3438 ifmgd->beacon_crc = ncrc; 3439 ifmgd->beacon_crc_valid = true; 3440 3441 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 3442 3443 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 3444 rx_status->device_timestamp, 3445 &elems, true); 3446 3447 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 3448 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 3449 elems.wmm_param_len)) 3450 changed |= BSS_CHANGED_QOS; 3451 3452 /* 3453 * If we haven't had a beacon before, tell the driver about the 3454 * DTIM period (and beacon timing if desired) now. 3455 */ 3456 if (!ifmgd->have_beacon) { 3457 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 3458 if (elems.tim) 3459 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3460 else 3461 bss_conf->dtim_period = 1; 3462 3463 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 3464 sdata->vif.bss_conf.sync_tsf = 3465 le64_to_cpu(mgmt->u.beacon.timestamp); 3466 sdata->vif.bss_conf.sync_device_ts = 3467 rx_status->device_timestamp; 3468 if (elems.tim) 3469 sdata->vif.bss_conf.sync_dtim_count = 3470 elems.tim->dtim_count; 3471 else 3472 sdata->vif.bss_conf.sync_dtim_count = 0; 3473 } 3474 3475 changed |= BSS_CHANGED_BEACON_INFO; 3476 ifmgd->have_beacon = true; 3477 3478 mutex_lock(&local->iflist_mtx); 3479 ieee80211_recalc_ps(local, -1); 3480 mutex_unlock(&local->iflist_mtx); 3481 3482 ieee80211_recalc_ps_vif(sdata); 3483 } 3484 3485 if (elems.erp_info) { 3486 erp_valid = true; 3487 erp_value = elems.erp_info[0]; 3488 } else { 3489 erp_valid = false; 3490 } 3491 changed |= ieee80211_handle_bss_capability(sdata, 3492 le16_to_cpu(mgmt->u.beacon.capab_info), 3493 erp_valid, erp_value); 3494 3495 mutex_lock(&local->sta_mtx); 3496 sta = sta_info_get(sdata, bssid); 3497 3498 if (ieee80211_config_bw(sdata, sta, 3499 elems.ht_cap_elem, elems.ht_operation, 3500 elems.vht_operation, bssid, &changed)) { 3501 mutex_unlock(&local->sta_mtx); 3502 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3503 WLAN_REASON_DEAUTH_LEAVING, 3504 true, deauth_buf); 3505 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf, 3506 sizeof(deauth_buf)); 3507 return; 3508 } 3509 3510 if (sta && elems.opmode_notif) 3511 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3512 rx_status->band, true); 3513 mutex_unlock(&local->sta_mtx); 3514 3515 changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt, 3516 elems.country_elem, 3517 elems.country_elem_len, 3518 elems.pwr_constr_elem, 3519 elems.cisco_dtpc_elem); 3520 3521 ieee80211_bss_info_change_notify(sdata, changed); 3522 } 3523 3524 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3525 struct sk_buff *skb) 3526 { 3527 struct ieee80211_rx_status *rx_status; 3528 struct ieee80211_mgmt *mgmt; 3529 u16 fc; 3530 struct ieee802_11_elems elems; 3531 int ies_len; 3532 3533 rx_status = (struct ieee80211_rx_status *) skb->cb; 3534 mgmt = (struct ieee80211_mgmt *) skb->data; 3535 fc = le16_to_cpu(mgmt->frame_control); 3536 3537 sdata_lock(sdata); 3538 3539 switch (fc & IEEE80211_FCTL_STYPE) { 3540 case IEEE80211_STYPE_BEACON: 3541 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3542 break; 3543 case IEEE80211_STYPE_PROBE_RESP: 3544 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3545 break; 3546 case IEEE80211_STYPE_AUTH: 3547 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3548 break; 3549 case IEEE80211_STYPE_DEAUTH: 3550 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3551 break; 3552 case IEEE80211_STYPE_DISASSOC: 3553 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3554 break; 3555 case IEEE80211_STYPE_ASSOC_RESP: 3556 case IEEE80211_STYPE_REASSOC_RESP: 3557 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3558 break; 3559 case IEEE80211_STYPE_ACTION: 3560 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3561 ies_len = skb->len - 3562 offsetof(struct ieee80211_mgmt, 3563 u.action.u.chan_switch.variable); 3564 3565 if (ies_len < 0) 3566 break; 3567 3568 ieee802_11_parse_elems( 3569 mgmt->u.action.u.chan_switch.variable, 3570 ies_len, true, &elems); 3571 3572 if (elems.parse_error) 3573 break; 3574 3575 ieee80211_sta_process_chanswitch(sdata, 3576 rx_status->mactime, 3577 rx_status->device_timestamp, 3578 &elems, false); 3579 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3580 ies_len = skb->len - 3581 offsetof(struct ieee80211_mgmt, 3582 u.action.u.ext_chan_switch.variable); 3583 3584 if (ies_len < 0) 3585 break; 3586 3587 ieee802_11_parse_elems( 3588 mgmt->u.action.u.ext_chan_switch.variable, 3589 ies_len, true, &elems); 3590 3591 if (elems.parse_error) 3592 break; 3593 3594 /* for the handling code pretend this was also an IE */ 3595 elems.ext_chansw_ie = 3596 &mgmt->u.action.u.ext_chan_switch.data; 3597 3598 ieee80211_sta_process_chanswitch(sdata, 3599 rx_status->mactime, 3600 rx_status->device_timestamp, 3601 &elems, false); 3602 } 3603 break; 3604 } 3605 sdata_unlock(sdata); 3606 } 3607 3608 static void ieee80211_sta_timer(unsigned long data) 3609 { 3610 struct ieee80211_sub_if_data *sdata = 3611 (struct ieee80211_sub_if_data *) data; 3612 3613 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3614 } 3615 3616 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3617 u8 *bssid, u8 reason, bool tx) 3618 { 3619 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3620 3621 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3622 tx, frame_buf); 3623 3624 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 3625 IEEE80211_DEAUTH_FRAME_LEN); 3626 } 3627 3628 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) 3629 { 3630 struct ieee80211_local *local = sdata->local; 3631 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3632 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3633 u32 tx_flags = 0; 3634 3635 sdata_assert_lock(sdata); 3636 3637 if (WARN_ON_ONCE(!auth_data)) 3638 return -EINVAL; 3639 3640 auth_data->tries++; 3641 3642 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3643 sdata_info(sdata, "authentication with %pM timed out\n", 3644 auth_data->bss->bssid); 3645 3646 /* 3647 * Most likely AP is not in the range so remove the 3648 * bss struct for that AP. 3649 */ 3650 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3651 3652 return -ETIMEDOUT; 3653 } 3654 3655 drv_mgd_prepare_tx(local, sdata); 3656 3657 if (auth_data->bss->proberesp_ies) { 3658 u16 trans = 1; 3659 u16 status = 0; 3660 3661 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3662 auth_data->bss->bssid, auth_data->tries, 3663 IEEE80211_AUTH_MAX_TRIES); 3664 3665 auth_data->expected_transaction = 2; 3666 3667 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3668 trans = auth_data->sae_trans; 3669 status = auth_data->sae_status; 3670 auth_data->expected_transaction = trans; 3671 } 3672 3673 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3674 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3675 IEEE80211_TX_INTFL_MLME_CONN_TX; 3676 3677 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3678 auth_data->data, auth_data->data_len, 3679 auth_data->bss->bssid, 3680 auth_data->bss->bssid, NULL, 0, 0, 3681 tx_flags); 3682 } else { 3683 const u8 *ssidie; 3684 3685 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n", 3686 auth_data->bss->bssid, auth_data->tries, 3687 IEEE80211_AUTH_MAX_TRIES); 3688 3689 rcu_read_lock(); 3690 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); 3691 if (!ssidie) { 3692 rcu_read_unlock(); 3693 return -EINVAL; 3694 } 3695 /* 3696 * Direct probe is sent to broadcast address as some APs 3697 * will not answer to direct packet in unassociated state. 3698 */ 3699 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL, 3700 ssidie + 2, ssidie[1], 3701 NULL, 0, (u32) -1, true, 0, 3702 auth_data->bss->channel, false); 3703 rcu_read_unlock(); 3704 } 3705 3706 if (tx_flags == 0) { 3707 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3708 auth_data->timeout_started = true; 3709 run_again(sdata, auth_data->timeout); 3710 } else { 3711 auth_data->timeout = 3712 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3713 auth_data->timeout_started = true; 3714 run_again(sdata, auth_data->timeout); 3715 } 3716 3717 return 0; 3718 } 3719 3720 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3721 { 3722 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3723 struct ieee80211_local *local = sdata->local; 3724 3725 sdata_assert_lock(sdata); 3726 3727 assoc_data->tries++; 3728 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3729 sdata_info(sdata, "association with %pM timed out\n", 3730 assoc_data->bss->bssid); 3731 3732 /* 3733 * Most likely AP is not in the range so remove the 3734 * bss struct for that AP. 3735 */ 3736 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3737 3738 return -ETIMEDOUT; 3739 } 3740 3741 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3742 assoc_data->bss->bssid, assoc_data->tries, 3743 IEEE80211_ASSOC_MAX_TRIES); 3744 ieee80211_send_assoc(sdata); 3745 3746 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) { 3747 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3748 assoc_data->timeout_started = true; 3749 run_again(sdata, assoc_data->timeout); 3750 } else { 3751 assoc_data->timeout = 3752 round_jiffies_up(jiffies + 3753 IEEE80211_ASSOC_TIMEOUT_LONG); 3754 assoc_data->timeout_started = true; 3755 run_again(sdata, assoc_data->timeout); 3756 } 3757 3758 return 0; 3759 } 3760 3761 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3762 __le16 fc, bool acked) 3763 { 3764 struct ieee80211_local *local = sdata->local; 3765 3766 sdata->u.mgd.status_fc = fc; 3767 sdata->u.mgd.status_acked = acked; 3768 sdata->u.mgd.status_received = true; 3769 3770 ieee80211_queue_work(&local->hw, &sdata->work); 3771 } 3772 3773 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3774 { 3775 struct ieee80211_local *local = sdata->local; 3776 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3777 3778 sdata_lock(sdata); 3779 3780 if (ifmgd->status_received) { 3781 __le16 fc = ifmgd->status_fc; 3782 bool status_acked = ifmgd->status_acked; 3783 3784 ifmgd->status_received = false; 3785 if (ifmgd->auth_data && 3786 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) { 3787 if (status_acked) { 3788 ifmgd->auth_data->timeout = 3789 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3790 run_again(sdata, ifmgd->auth_data->timeout); 3791 } else { 3792 ifmgd->auth_data->timeout = jiffies - 1; 3793 } 3794 ifmgd->auth_data->timeout_started = true; 3795 } else if (ifmgd->assoc_data && 3796 (ieee80211_is_assoc_req(fc) || 3797 ieee80211_is_reassoc_req(fc))) { 3798 if (status_acked) { 3799 ifmgd->assoc_data->timeout = 3800 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3801 run_again(sdata, ifmgd->assoc_data->timeout); 3802 } else { 3803 ifmgd->assoc_data->timeout = jiffies - 1; 3804 } 3805 ifmgd->assoc_data->timeout_started = true; 3806 } 3807 } 3808 3809 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3810 time_after(jiffies, ifmgd->auth_data->timeout)) { 3811 if (ifmgd->auth_data->done) { 3812 /* 3813 * ok ... we waited for assoc but userspace didn't, 3814 * so let's just kill the auth data 3815 */ 3816 ieee80211_destroy_auth_data(sdata, false); 3817 } else if (ieee80211_probe_auth(sdata)) { 3818 u8 bssid[ETH_ALEN]; 3819 3820 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3821 3822 ieee80211_destroy_auth_data(sdata, false); 3823 3824 cfg80211_auth_timeout(sdata->dev, bssid); 3825 } 3826 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3827 run_again(sdata, ifmgd->auth_data->timeout); 3828 3829 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3830 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3831 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3832 ieee80211_do_assoc(sdata)) { 3833 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3834 3835 ieee80211_destroy_assoc_data(sdata, false); 3836 cfg80211_assoc_timeout(sdata->dev, bss); 3837 } 3838 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3839 run_again(sdata, ifmgd->assoc_data->timeout); 3840 3841 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3842 ifmgd->associated) { 3843 u8 bssid[ETH_ALEN]; 3844 int max_tries; 3845 3846 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3847 3848 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3849 max_tries = max_nullfunc_tries; 3850 else 3851 max_tries = max_probe_tries; 3852 3853 /* ACK received for nullfunc probing frame */ 3854 if (!ifmgd->probe_send_count) 3855 ieee80211_reset_ap_probe(sdata); 3856 else if (ifmgd->nullfunc_failed) { 3857 if (ifmgd->probe_send_count < max_tries) { 3858 mlme_dbg(sdata, 3859 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3860 bssid, ifmgd->probe_send_count, 3861 max_tries); 3862 ieee80211_mgd_probe_ap_send(sdata); 3863 } else { 3864 mlme_dbg(sdata, 3865 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3866 bssid); 3867 ieee80211_sta_connection_lost(sdata, bssid, 3868 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3869 false); 3870 } 3871 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3872 run_again(sdata, ifmgd->probe_timeout); 3873 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 3874 mlme_dbg(sdata, 3875 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3876 bssid, probe_wait_ms); 3877 ieee80211_sta_connection_lost(sdata, bssid, 3878 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3879 } else if (ifmgd->probe_send_count < max_tries) { 3880 mlme_dbg(sdata, 3881 "No probe response from AP %pM after %dms, try %d/%i\n", 3882 bssid, probe_wait_ms, 3883 ifmgd->probe_send_count, max_tries); 3884 ieee80211_mgd_probe_ap_send(sdata); 3885 } else { 3886 /* 3887 * We actually lost the connection ... or did we? 3888 * Let's make sure! 3889 */ 3890 wiphy_debug(local->hw.wiphy, 3891 "%s: No probe response from AP %pM" 3892 " after %dms, disconnecting.\n", 3893 sdata->name, 3894 bssid, probe_wait_ms); 3895 3896 ieee80211_sta_connection_lost(sdata, bssid, 3897 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3898 } 3899 } 3900 3901 sdata_unlock(sdata); 3902 } 3903 3904 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3905 { 3906 struct ieee80211_sub_if_data *sdata = 3907 (struct ieee80211_sub_if_data *) data; 3908 struct ieee80211_local *local = sdata->local; 3909 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3910 3911 if (local->quiescing) 3912 return; 3913 3914 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3915 return; 3916 3917 sdata->u.mgd.connection_loss = false; 3918 ieee80211_queue_work(&sdata->local->hw, 3919 &sdata->u.mgd.beacon_connection_loss_work); 3920 } 3921 3922 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3923 { 3924 struct ieee80211_sub_if_data *sdata = 3925 (struct ieee80211_sub_if_data *) data; 3926 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3927 struct ieee80211_local *local = sdata->local; 3928 3929 if (local->quiescing) 3930 return; 3931 3932 if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) 3933 return; 3934 3935 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3936 } 3937 3938 static void ieee80211_sta_monitor_work(struct work_struct *work) 3939 { 3940 struct ieee80211_sub_if_data *sdata = 3941 container_of(work, struct ieee80211_sub_if_data, 3942 u.mgd.monitor_work); 3943 3944 ieee80211_mgd_probe_ap(sdata, false); 3945 } 3946 3947 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3948 { 3949 u32 flags; 3950 3951 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3952 __ieee80211_stop_poll(sdata); 3953 3954 /* let's probe the connection once */ 3955 flags = sdata->local->hw.flags; 3956 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) 3957 ieee80211_queue_work(&sdata->local->hw, 3958 &sdata->u.mgd.monitor_work); 3959 /* and do all the other regular work too */ 3960 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3961 } 3962 } 3963 3964 #ifdef CONFIG_PM 3965 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata) 3966 { 3967 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3968 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3969 3970 sdata_lock(sdata); 3971 3972 if (ifmgd->auth_data || ifmgd->assoc_data) { 3973 const u8 *bssid = ifmgd->auth_data ? 3974 ifmgd->auth_data->bss->bssid : 3975 ifmgd->assoc_data->bss->bssid; 3976 3977 /* 3978 * If we are trying to authenticate / associate while suspending, 3979 * cfg80211 won't know and won't actually abort those attempts, 3980 * thus we need to do that ourselves. 3981 */ 3982 ieee80211_send_deauth_disassoc(sdata, bssid, 3983 IEEE80211_STYPE_DEAUTH, 3984 WLAN_REASON_DEAUTH_LEAVING, 3985 false, frame_buf); 3986 if (ifmgd->assoc_data) 3987 ieee80211_destroy_assoc_data(sdata, false); 3988 if (ifmgd->auth_data) 3989 ieee80211_destroy_auth_data(sdata, false); 3990 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 3991 IEEE80211_DEAUTH_FRAME_LEN); 3992 } 3993 3994 sdata_unlock(sdata); 3995 } 3996 3997 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 3998 { 3999 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4000 4001 sdata_lock(sdata); 4002 if (!ifmgd->associated) { 4003 sdata_unlock(sdata); 4004 return; 4005 } 4006 4007 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 4008 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 4009 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 4010 ieee80211_sta_connection_lost(sdata, 4011 ifmgd->associated->bssid, 4012 WLAN_REASON_UNSPECIFIED, 4013 true); 4014 sdata_unlock(sdata); 4015 return; 4016 } 4017 sdata_unlock(sdata); 4018 } 4019 #endif 4020 4021 /* interface setup */ 4022 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 4023 { 4024 struct ieee80211_if_managed *ifmgd; 4025 4026 ifmgd = &sdata->u.mgd; 4027 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 4028 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 4029 INIT_WORK(&ifmgd->beacon_connection_loss_work, 4030 ieee80211_beacon_connection_loss_work); 4031 INIT_WORK(&ifmgd->csa_connection_drop_work, 4032 ieee80211_csa_connection_drop_work); 4033 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 4034 INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work, 4035 ieee80211_tdls_peer_del_work); 4036 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 4037 (unsigned long) sdata); 4038 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 4039 (unsigned long) sdata); 4040 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 4041 (unsigned long) sdata); 4042 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 4043 (unsigned long) sdata); 4044 INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk, 4045 ieee80211_sta_handle_tspec_ac_params_wk); 4046 4047 ifmgd->flags = 0; 4048 ifmgd->powersave = sdata->wdev.ps; 4049 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 4050 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 4051 ifmgd->p2p_noa_index = -1; 4052 4053 if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS) 4054 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 4055 else 4056 ifmgd->req_smps = IEEE80211_SMPS_OFF; 4057 4058 /* Setup TDLS data */ 4059 spin_lock_init(&ifmgd->teardown_lock); 4060 ifmgd->teardown_skb = NULL; 4061 ifmgd->orig_teardown_skb = NULL; 4062 } 4063 4064 /* scan finished notification */ 4065 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 4066 { 4067 struct ieee80211_sub_if_data *sdata; 4068 4069 /* Restart STA timers */ 4070 rcu_read_lock(); 4071 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 4072 if (ieee80211_sdata_running(sdata)) 4073 ieee80211_restart_sta_timer(sdata); 4074 } 4075 rcu_read_unlock(); 4076 } 4077 4078 int ieee80211_max_network_latency(struct notifier_block *nb, 4079 unsigned long data, void *dummy) 4080 { 4081 s32 latency_usec = (s32) data; 4082 struct ieee80211_local *local = 4083 container_of(nb, struct ieee80211_local, 4084 network_latency_notifier); 4085 4086 mutex_lock(&local->iflist_mtx); 4087 ieee80211_recalc_ps(local, latency_usec); 4088 mutex_unlock(&local->iflist_mtx); 4089 4090 return NOTIFY_OK; 4091 } 4092 4093 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 4094 struct cfg80211_bss *cbss) 4095 { 4096 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4097 const u8 *ht_cap_ie, *vht_cap_ie; 4098 const struct ieee80211_ht_cap *ht_cap; 4099 const struct ieee80211_vht_cap *vht_cap; 4100 u8 chains = 1; 4101 4102 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 4103 return chains; 4104 4105 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4106 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 4107 ht_cap = (void *)(ht_cap_ie + 2); 4108 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 4109 /* 4110 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 4111 * "Tx Unequal Modulation Supported" fields. 4112 */ 4113 } 4114 4115 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 4116 return chains; 4117 4118 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4119 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 4120 u8 nss; 4121 u16 tx_mcs_map; 4122 4123 vht_cap = (void *)(vht_cap_ie + 2); 4124 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 4125 for (nss = 8; nss > 0; nss--) { 4126 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 4127 IEEE80211_VHT_MCS_NOT_SUPPORTED) 4128 break; 4129 } 4130 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 4131 chains = max(chains, nss); 4132 } 4133 4134 return chains; 4135 } 4136 4137 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 4138 struct cfg80211_bss *cbss) 4139 { 4140 struct ieee80211_local *local = sdata->local; 4141 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4142 const struct ieee80211_ht_cap *ht_cap = NULL; 4143 const struct ieee80211_ht_operation *ht_oper = NULL; 4144 const struct ieee80211_vht_operation *vht_oper = NULL; 4145 struct ieee80211_supported_band *sband; 4146 struct cfg80211_chan_def chandef; 4147 int ret; 4148 4149 sband = local->hw.wiphy->bands[cbss->channel->band]; 4150 4151 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 4152 IEEE80211_STA_DISABLE_80P80MHZ | 4153 IEEE80211_STA_DISABLE_160MHZ); 4154 4155 rcu_read_lock(); 4156 4157 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 4158 sband->ht_cap.ht_supported) { 4159 const u8 *ht_oper_ie, *ht_cap_ie; 4160 4161 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 4162 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 4163 ht_oper = (void *)(ht_oper_ie + 2); 4164 4165 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 4166 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) 4167 ht_cap = (void *)(ht_cap_ie + 2); 4168 4169 if (!ht_cap) { 4170 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4171 ht_oper = NULL; 4172 } 4173 } 4174 4175 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 4176 sband->vht_cap.vht_supported) { 4177 const u8 *vht_oper_ie, *vht_cap; 4178 4179 vht_oper_ie = ieee80211_bss_get_ie(cbss, 4180 WLAN_EID_VHT_OPERATION); 4181 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 4182 vht_oper = (void *)(vht_oper_ie + 2); 4183 if (vht_oper && !ht_oper) { 4184 vht_oper = NULL; 4185 sdata_info(sdata, 4186 "AP advertised VHT without HT, disabling both\n"); 4187 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4188 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4189 } 4190 4191 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 4192 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 4193 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4194 vht_oper = NULL; 4195 } 4196 } 4197 4198 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 4199 cbss->channel, 4200 ht_cap, ht_oper, vht_oper, 4201 &chandef, false); 4202 4203 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 4204 local->rx_chains); 4205 4206 rcu_read_unlock(); 4207 4208 /* will change later if needed */ 4209 sdata->smps_mode = IEEE80211_SMPS_OFF; 4210 4211 mutex_lock(&local->mtx); 4212 /* 4213 * If this fails (possibly due to channel context sharing 4214 * on incompatible channels, e.g. 80+80 and 160 sharing the 4215 * same control channel) try to use a smaller bandwidth. 4216 */ 4217 ret = ieee80211_vif_use_channel(sdata, &chandef, 4218 IEEE80211_CHANCTX_SHARED); 4219 4220 /* don't downgrade for 5 and 10 MHz channels, though. */ 4221 if (chandef.width == NL80211_CHAN_WIDTH_5 || 4222 chandef.width == NL80211_CHAN_WIDTH_10) 4223 goto out; 4224 4225 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 4226 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 4227 ret = ieee80211_vif_use_channel(sdata, &chandef, 4228 IEEE80211_CHANCTX_SHARED); 4229 } 4230 out: 4231 mutex_unlock(&local->mtx); 4232 return ret; 4233 } 4234 4235 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 4236 struct cfg80211_bss *cbss, bool assoc) 4237 { 4238 struct ieee80211_local *local = sdata->local; 4239 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4240 struct ieee80211_bss *bss = (void *)cbss->priv; 4241 struct sta_info *new_sta = NULL; 4242 struct ieee80211_supported_band *sband; 4243 struct ieee80211_sta_ht_cap sta_ht_cap; 4244 bool have_sta = false, is_override = false; 4245 int err; 4246 4247 sband = local->hw.wiphy->bands[cbss->channel->band]; 4248 4249 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 4250 return -EINVAL; 4251 4252 if (assoc) { 4253 rcu_read_lock(); 4254 have_sta = sta_info_get(sdata, cbss->bssid); 4255 rcu_read_unlock(); 4256 } 4257 4258 if (!have_sta) { 4259 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 4260 if (!new_sta) 4261 return -ENOMEM; 4262 } 4263 4264 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap)); 4265 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap); 4266 4267 is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) != 4268 (sband->ht_cap.cap & 4269 IEEE80211_HT_CAP_SUP_WIDTH_20_40); 4270 4271 if (new_sta || is_override) { 4272 err = ieee80211_prep_channel(sdata, cbss); 4273 if (err) { 4274 if (new_sta) 4275 sta_info_free(local, new_sta); 4276 return -EINVAL; 4277 } 4278 } 4279 4280 if (new_sta) { 4281 u32 rates = 0, basic_rates = 0; 4282 bool have_higher_than_11mbit; 4283 int min_rate = INT_MAX, min_rate_index = -1; 4284 struct ieee80211_chanctx_conf *chanctx_conf; 4285 const struct cfg80211_bss_ies *ies; 4286 int shift = ieee80211_vif_get_shift(&sdata->vif); 4287 u32 rate_flags; 4288 4289 rcu_read_lock(); 4290 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4291 if (WARN_ON(!chanctx_conf)) { 4292 rcu_read_unlock(); 4293 sta_info_free(local, new_sta); 4294 return -EINVAL; 4295 } 4296 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 4297 rcu_read_unlock(); 4298 4299 ieee80211_get_rates(sband, bss->supp_rates, 4300 bss->supp_rates_len, 4301 &rates, &basic_rates, 4302 &have_higher_than_11mbit, 4303 &min_rate, &min_rate_index, 4304 shift, rate_flags); 4305 4306 /* 4307 * This used to be a workaround for basic rates missing 4308 * in the association response frame. Now that we no 4309 * longer use the basic rates from there, it probably 4310 * doesn't happen any more, but keep the workaround so 4311 * in case some *other* APs are buggy in different ways 4312 * we can connect -- with a warning. 4313 */ 4314 if (!basic_rates && min_rate_index >= 0) { 4315 sdata_info(sdata, 4316 "No basic rates, using min rate instead\n"); 4317 basic_rates = BIT(min_rate_index); 4318 } 4319 4320 new_sta->sta.supp_rates[cbss->channel->band] = rates; 4321 sdata->vif.bss_conf.basic_rates = basic_rates; 4322 4323 /* cf. IEEE 802.11 9.2.12 */ 4324 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 4325 have_higher_than_11mbit) 4326 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 4327 else 4328 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 4329 4330 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 4331 4332 /* set timing information */ 4333 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 4334 rcu_read_lock(); 4335 ies = rcu_dereference(cbss->beacon_ies); 4336 if (ies) { 4337 const u8 *tim_ie; 4338 4339 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4340 sdata->vif.bss_conf.sync_device_ts = 4341 bss->device_ts_beacon; 4342 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4343 ies->data, ies->len); 4344 if (tim_ie && tim_ie[1] >= 2) 4345 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 4346 else 4347 sdata->vif.bss_conf.sync_dtim_count = 0; 4348 } else if (!(local->hw.flags & 4349 IEEE80211_HW_TIMING_BEACON_ONLY)) { 4350 ies = rcu_dereference(cbss->proberesp_ies); 4351 /* must be non-NULL since beacon IEs were NULL */ 4352 sdata->vif.bss_conf.sync_tsf = ies->tsf; 4353 sdata->vif.bss_conf.sync_device_ts = 4354 bss->device_ts_presp; 4355 sdata->vif.bss_conf.sync_dtim_count = 0; 4356 } else { 4357 sdata->vif.bss_conf.sync_tsf = 0; 4358 sdata->vif.bss_conf.sync_device_ts = 0; 4359 sdata->vif.bss_conf.sync_dtim_count = 0; 4360 } 4361 rcu_read_unlock(); 4362 4363 /* tell driver about BSSID, basic rates and timing */ 4364 ieee80211_bss_info_change_notify(sdata, 4365 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 4366 BSS_CHANGED_BEACON_INT); 4367 4368 if (assoc) 4369 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 4370 4371 err = sta_info_insert(new_sta); 4372 new_sta = NULL; 4373 if (err) { 4374 sdata_info(sdata, 4375 "failed to insert STA entry for the AP (error %d)\n", 4376 err); 4377 return err; 4378 } 4379 } else 4380 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 4381 4382 return 0; 4383 } 4384 4385 /* config hooks */ 4386 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 4387 struct cfg80211_auth_request *req) 4388 { 4389 struct ieee80211_local *local = sdata->local; 4390 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4391 struct ieee80211_mgd_auth_data *auth_data; 4392 u16 auth_alg; 4393 int err; 4394 4395 /* prepare auth data structure */ 4396 4397 switch (req->auth_type) { 4398 case NL80211_AUTHTYPE_OPEN_SYSTEM: 4399 auth_alg = WLAN_AUTH_OPEN; 4400 break; 4401 case NL80211_AUTHTYPE_SHARED_KEY: 4402 if (IS_ERR(local->wep_tx_tfm)) 4403 return -EOPNOTSUPP; 4404 auth_alg = WLAN_AUTH_SHARED_KEY; 4405 break; 4406 case NL80211_AUTHTYPE_FT: 4407 auth_alg = WLAN_AUTH_FT; 4408 break; 4409 case NL80211_AUTHTYPE_NETWORK_EAP: 4410 auth_alg = WLAN_AUTH_LEAP; 4411 break; 4412 case NL80211_AUTHTYPE_SAE: 4413 auth_alg = WLAN_AUTH_SAE; 4414 break; 4415 default: 4416 return -EOPNOTSUPP; 4417 } 4418 4419 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 4420 req->ie_len, GFP_KERNEL); 4421 if (!auth_data) 4422 return -ENOMEM; 4423 4424 auth_data->bss = req->bss; 4425 4426 if (req->sae_data_len >= 4) { 4427 __le16 *pos = (__le16 *) req->sae_data; 4428 auth_data->sae_trans = le16_to_cpu(pos[0]); 4429 auth_data->sae_status = le16_to_cpu(pos[1]); 4430 memcpy(auth_data->data, req->sae_data + 4, 4431 req->sae_data_len - 4); 4432 auth_data->data_len += req->sae_data_len - 4; 4433 } 4434 4435 if (req->ie && req->ie_len) { 4436 memcpy(&auth_data->data[auth_data->data_len], 4437 req->ie, req->ie_len); 4438 auth_data->data_len += req->ie_len; 4439 } 4440 4441 if (req->key && req->key_len) { 4442 auth_data->key_len = req->key_len; 4443 auth_data->key_idx = req->key_idx; 4444 memcpy(auth_data->key, req->key, req->key_len); 4445 } 4446 4447 auth_data->algorithm = auth_alg; 4448 4449 /* try to authenticate/probe */ 4450 4451 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 4452 ifmgd->assoc_data) { 4453 err = -EBUSY; 4454 goto err_free; 4455 } 4456 4457 if (ifmgd->auth_data) 4458 ieee80211_destroy_auth_data(sdata, false); 4459 4460 /* prep auth_data so we don't go into idle on disassoc */ 4461 ifmgd->auth_data = auth_data; 4462 4463 if (ifmgd->associated) { 4464 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4465 4466 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4467 WLAN_REASON_UNSPECIFIED, 4468 false, frame_buf); 4469 4470 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4471 sizeof(frame_buf)); 4472 } 4473 4474 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 4475 4476 err = ieee80211_prep_connection(sdata, req->bss, false); 4477 if (err) 4478 goto err_clear; 4479 4480 err = ieee80211_probe_auth(sdata); 4481 if (err) { 4482 sta_info_destroy_addr(sdata, req->bss->bssid); 4483 goto err_clear; 4484 } 4485 4486 /* hold our own reference */ 4487 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 4488 return 0; 4489 4490 err_clear: 4491 memset(ifmgd->bssid, 0, ETH_ALEN); 4492 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4493 ifmgd->auth_data = NULL; 4494 err_free: 4495 kfree(auth_data); 4496 return err; 4497 } 4498 4499 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata, 4500 const u8 *wmm_param, int len) 4501 { 4502 const u8 *pos; 4503 size_t left; 4504 4505 if (len < 8) 4506 return false; 4507 4508 if (wmm_param[5] != 1 /* version */) 4509 return false; 4510 4511 pos = wmm_param + 8; 4512 left = len - 8; 4513 4514 for (; left >= 4; left -= 4, pos += 4) { 4515 u8 aifsn = pos[0] & 0x0f; 4516 u8 ecwmin = pos[1] & 0x0f; 4517 u8 ecwmax = (pos[1] & 0xf0) >> 4; 4518 int aci = (pos[0] >> 5) & 0x03; 4519 4520 if (aifsn < 2) { 4521 sdata_info(sdata, 4522 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n", 4523 aifsn, aci); 4524 return false; 4525 } 4526 if (ecwmin > ecwmax) { 4527 sdata_info(sdata, 4528 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n", 4529 ecwmin, ecwmax, aci); 4530 return false; 4531 } 4532 } 4533 4534 return true; 4535 } 4536 4537 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4538 struct cfg80211_assoc_request *req) 4539 { 4540 struct ieee80211_local *local = sdata->local; 4541 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4542 struct ieee80211_bss *bss = (void *)req->bss->priv; 4543 struct ieee80211_mgd_assoc_data *assoc_data; 4544 const struct cfg80211_bss_ies *beacon_ies; 4545 struct ieee80211_supported_band *sband; 4546 const u8 *ssidie, *ht_ie, *vht_ie; 4547 int i, err; 4548 4549 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4550 if (!assoc_data) 4551 return -ENOMEM; 4552 4553 rcu_read_lock(); 4554 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4555 if (!ssidie) { 4556 rcu_read_unlock(); 4557 kfree(assoc_data); 4558 return -EINVAL; 4559 } 4560 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4561 assoc_data->ssid_len = ssidie[1]; 4562 rcu_read_unlock(); 4563 4564 if (ifmgd->associated) { 4565 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4566 4567 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4568 WLAN_REASON_UNSPECIFIED, 4569 false, frame_buf); 4570 4571 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4572 sizeof(frame_buf)); 4573 } 4574 4575 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4576 err = -EBUSY; 4577 goto err_free; 4578 } 4579 4580 if (ifmgd->assoc_data) { 4581 err = -EBUSY; 4582 goto err_free; 4583 } 4584 4585 if (ifmgd->auth_data) { 4586 bool match; 4587 4588 /* keep sta info, bssid if matching */ 4589 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4590 ieee80211_destroy_auth_data(sdata, match); 4591 } 4592 4593 /* prepare assoc data */ 4594 4595 ifmgd->beacon_crc_valid = false; 4596 4597 assoc_data->wmm = bss->wmm_used && 4598 (local->hw.queues >= IEEE80211_NUM_ACS); 4599 if (assoc_data->wmm) { 4600 /* try to check validity of WMM params IE */ 4601 const struct cfg80211_bss_ies *ies; 4602 const u8 *wp, *start, *end; 4603 4604 rcu_read_lock(); 4605 ies = rcu_dereference(req->bss->ies); 4606 start = ies->data; 4607 end = start + ies->len; 4608 4609 while (true) { 4610 wp = cfg80211_find_vendor_ie( 4611 WLAN_OUI_MICROSOFT, 4612 WLAN_OUI_TYPE_MICROSOFT_WMM, 4613 start, end - start); 4614 if (!wp) 4615 break; 4616 start = wp + wp[1] + 2; 4617 /* if this IE is too short, try the next */ 4618 if (wp[1] <= 4) 4619 continue; 4620 /* if this IE is WMM params, we found what we wanted */ 4621 if (wp[6] == 1) 4622 break; 4623 } 4624 4625 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2, 4626 wp[1] - 2)) { 4627 assoc_data->wmm = false; 4628 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 4629 } 4630 rcu_read_unlock(); 4631 } 4632 4633 /* 4634 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4635 * We still associate in non-HT mode (11a/b/g) if any one of these 4636 * ciphers is configured as pairwise. 4637 * We can set this to true for non-11n hardware, that'll be checked 4638 * separately along with the peer capabilities. 4639 */ 4640 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4641 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4642 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4643 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4644 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4645 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4646 netdev_info(sdata->dev, 4647 "disabling HT/VHT due to WEP/TKIP use\n"); 4648 } 4649 } 4650 4651 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4652 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4653 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4654 } 4655 4656 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4657 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4658 4659 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4660 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4661 if (!sband->ht_cap.ht_supported || 4662 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4663 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4664 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4665 if (!bss->wmm_used && 4666 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4667 netdev_info(sdata->dev, 4668 "disabling HT as WMM/QoS is not supported by the AP\n"); 4669 } 4670 4671 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4672 if (!sband->vht_cap.vht_supported || 4673 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4674 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4675 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4676 if (!bss->wmm_used && 4677 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4678 netdev_info(sdata->dev, 4679 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4680 } 4681 4682 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4683 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4684 sizeof(ifmgd->ht_capa_mask)); 4685 4686 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4687 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4688 sizeof(ifmgd->vht_capa_mask)); 4689 4690 if (req->ie && req->ie_len) { 4691 memcpy(assoc_data->ie, req->ie, req->ie_len); 4692 assoc_data->ie_len = req->ie_len; 4693 } 4694 4695 assoc_data->bss = req->bss; 4696 4697 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4698 if (ifmgd->powersave) 4699 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4700 else 4701 sdata->smps_mode = IEEE80211_SMPS_OFF; 4702 } else 4703 sdata->smps_mode = ifmgd->req_smps; 4704 4705 assoc_data->capability = req->bss->capability; 4706 assoc_data->supp_rates = bss->supp_rates; 4707 assoc_data->supp_rates_len = bss->supp_rates_len; 4708 4709 rcu_read_lock(); 4710 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4711 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4712 assoc_data->ap_ht_param = 4713 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4714 else 4715 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4716 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4717 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4718 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4719 sizeof(struct ieee80211_vht_cap)); 4720 else 4721 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4722 rcu_read_unlock(); 4723 4724 if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) && 4725 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), 4726 "U-APSD not supported with HW_PS_NULLFUNC_STACK\n")) 4727 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD; 4728 4729 if (bss->wmm_used && bss->uapsd_supported && 4730 (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) { 4731 assoc_data->uapsd = true; 4732 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4733 } else { 4734 assoc_data->uapsd = false; 4735 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4736 } 4737 4738 if (req->prev_bssid) 4739 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4740 4741 if (req->use_mfp) { 4742 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4743 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4744 } else { 4745 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4746 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4747 } 4748 4749 if (req->flags & ASSOC_REQ_USE_RRM) 4750 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM; 4751 else 4752 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM; 4753 4754 if (req->crypto.control_port) 4755 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4756 else 4757 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4758 4759 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4760 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4761 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4762 sdata->vif.type); 4763 4764 /* kick off associate process */ 4765 4766 ifmgd->assoc_data = assoc_data; 4767 ifmgd->dtim_period = 0; 4768 ifmgd->have_beacon = false; 4769 4770 err = ieee80211_prep_connection(sdata, req->bss, true); 4771 if (err) 4772 goto err_clear; 4773 4774 rcu_read_lock(); 4775 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4776 4777 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC && 4778 !beacon_ies) { 4779 /* 4780 * Wait up to one beacon interval ... 4781 * should this be more if we miss one? 4782 */ 4783 sdata_info(sdata, "waiting for beacon from %pM\n", 4784 ifmgd->bssid); 4785 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4786 assoc_data->timeout_started = true; 4787 assoc_data->need_beacon = true; 4788 } else if (beacon_ies) { 4789 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4790 beacon_ies->data, 4791 beacon_ies->len); 4792 u8 dtim_count = 0; 4793 4794 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4795 const struct ieee80211_tim_ie *tim; 4796 tim = (void *)(tim_ie + 2); 4797 ifmgd->dtim_period = tim->dtim_period; 4798 dtim_count = tim->dtim_count; 4799 } 4800 ifmgd->have_beacon = true; 4801 assoc_data->timeout = jiffies; 4802 assoc_data->timeout_started = true; 4803 4804 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 4805 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4806 sdata->vif.bss_conf.sync_device_ts = 4807 bss->device_ts_beacon; 4808 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4809 } 4810 } else { 4811 assoc_data->timeout = jiffies; 4812 assoc_data->timeout_started = true; 4813 } 4814 rcu_read_unlock(); 4815 4816 run_again(sdata, assoc_data->timeout); 4817 4818 if (bss->corrupt_data) { 4819 char *corrupt_type = "data"; 4820 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4821 if (bss->corrupt_data & 4822 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4823 corrupt_type = "beacon and probe response"; 4824 else 4825 corrupt_type = "beacon"; 4826 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4827 corrupt_type = "probe response"; 4828 sdata_info(sdata, "associating with AP with corrupt %s\n", 4829 corrupt_type); 4830 } 4831 4832 return 0; 4833 err_clear: 4834 memset(ifmgd->bssid, 0, ETH_ALEN); 4835 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4836 ifmgd->assoc_data = NULL; 4837 err_free: 4838 kfree(assoc_data); 4839 return err; 4840 } 4841 4842 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4843 struct cfg80211_deauth_request *req) 4844 { 4845 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4846 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4847 bool tx = !req->local_state_change; 4848 4849 if (ifmgd->auth_data && 4850 ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) { 4851 sdata_info(sdata, 4852 "aborting authentication with %pM by local choice (Reason: %u=%s)\n", 4853 req->bssid, req->reason_code, 4854 ieee80211_get_reason_code_string(req->reason_code)); 4855 4856 drv_mgd_prepare_tx(sdata->local, sdata); 4857 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4858 IEEE80211_STYPE_DEAUTH, 4859 req->reason_code, tx, 4860 frame_buf); 4861 ieee80211_destroy_auth_data(sdata, false); 4862 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4863 IEEE80211_DEAUTH_FRAME_LEN); 4864 4865 return 0; 4866 } 4867 4868 if (ifmgd->associated && 4869 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4870 sdata_info(sdata, 4871 "deauthenticating from %pM by local choice (Reason: %u=%s)\n", 4872 req->bssid, req->reason_code, 4873 ieee80211_get_reason_code_string(req->reason_code)); 4874 4875 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4876 req->reason_code, tx, frame_buf); 4877 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4878 IEEE80211_DEAUTH_FRAME_LEN); 4879 return 0; 4880 } 4881 4882 return -ENOTCONN; 4883 } 4884 4885 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4886 struct cfg80211_disassoc_request *req) 4887 { 4888 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4889 u8 bssid[ETH_ALEN]; 4890 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4891 4892 /* 4893 * cfg80211 should catch this ... but it's racy since 4894 * we can receive a disassoc frame, process it, hand it 4895 * to cfg80211 while that's in a locked section already 4896 * trying to tell us that the user wants to disconnect. 4897 */ 4898 if (ifmgd->associated != req->bss) 4899 return -ENOLINK; 4900 4901 sdata_info(sdata, 4902 "disassociating from %pM by local choice (Reason: %u=%s)\n", 4903 req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code)); 4904 4905 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4906 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4907 req->reason_code, !req->local_state_change, 4908 frame_buf); 4909 4910 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4911 IEEE80211_DEAUTH_FRAME_LEN); 4912 4913 return 0; 4914 } 4915 4916 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4917 { 4918 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4919 4920 /* 4921 * Make sure some work items will not run after this, 4922 * they will not do anything but might not have been 4923 * cancelled when disconnecting. 4924 */ 4925 cancel_work_sync(&ifmgd->monitor_work); 4926 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4927 cancel_work_sync(&ifmgd->request_smps_work); 4928 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4929 cancel_work_sync(&ifmgd->chswitch_work); 4930 cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work); 4931 4932 sdata_lock(sdata); 4933 if (ifmgd->assoc_data) { 4934 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4935 ieee80211_destroy_assoc_data(sdata, false); 4936 cfg80211_assoc_timeout(sdata->dev, bss); 4937 } 4938 if (ifmgd->auth_data) 4939 ieee80211_destroy_auth_data(sdata, false); 4940 spin_lock_bh(&ifmgd->teardown_lock); 4941 if (ifmgd->teardown_skb) { 4942 kfree_skb(ifmgd->teardown_skb); 4943 ifmgd->teardown_skb = NULL; 4944 ifmgd->orig_teardown_skb = NULL; 4945 } 4946 spin_unlock_bh(&ifmgd->teardown_lock); 4947 del_timer_sync(&ifmgd->timer); 4948 sdata_unlock(sdata); 4949 } 4950 4951 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4952 enum nl80211_cqm_rssi_threshold_event rssi_event, 4953 gfp_t gfp) 4954 { 4955 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4956 4957 trace_api_cqm_rssi_notify(sdata, rssi_event); 4958 4959 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 4960 } 4961 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 4962 4963 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp) 4964 { 4965 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4966 4967 trace_api_cqm_beacon_loss_notify(sdata->local, sdata); 4968 4969 cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp); 4970 } 4971 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify); 4972