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 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/etherdevice.h> 19 #include <linux/moduleparam.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/pm_qos.h> 22 #include <linux/crc32.h> 23 #include <linux/slab.h> 24 #include <linux/export.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "led.h" 32 33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 34 #define IEEE80211_AUTH_TIMEOUT_LONG (HZ / 2) 35 #define IEEE80211_AUTH_TIMEOUT_SHORT (HZ / 10) 36 #define IEEE80211_AUTH_MAX_TRIES 3 37 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 38 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 39 #define IEEE80211_ASSOC_TIMEOUT_LONG (HZ / 2) 40 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 41 #define IEEE80211_ASSOC_MAX_TRIES 3 42 43 static int max_nullfunc_tries = 2; 44 module_param(max_nullfunc_tries, int, 0644); 45 MODULE_PARM_DESC(max_nullfunc_tries, 46 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 47 48 static int max_probe_tries = 5; 49 module_param(max_probe_tries, int, 0644); 50 MODULE_PARM_DESC(max_probe_tries, 51 "Maximum probe tries before disconnecting (reason 4)."); 52 53 /* 54 * Beacon loss timeout is calculated as N frames times the 55 * advertised beacon interval. This may need to be somewhat 56 * higher than what hardware might detect to account for 57 * delays in the host processing frames. But since we also 58 * probe on beacon miss before declaring the connection lost 59 * default to what we want. 60 */ 61 static int beacon_loss_count = 7; 62 module_param(beacon_loss_count, int, 0644); 63 MODULE_PARM_DESC(beacon_loss_count, 64 "Number of beacon intervals before we decide beacon was lost."); 65 66 /* 67 * Time the connection can be idle before we probe 68 * it to see if we can still talk to the AP. 69 */ 70 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 71 /* 72 * Time we wait for a probe response after sending 73 * a probe request because of beacon loss or for 74 * checking the connection still works. 75 */ 76 static int probe_wait_ms = 500; 77 module_param(probe_wait_ms, int, 0644); 78 MODULE_PARM_DESC(probe_wait_ms, 79 "Maximum time(ms) to wait for probe response" 80 " before disconnecting (reason 4)."); 81 82 /* 83 * Weight given to the latest Beacon frame when calculating average signal 84 * strength for Beacon frames received in the current BSS. This must be 85 * between 1 and 15. 86 */ 87 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 88 89 /* 90 * How many Beacon frames need to have been used in average signal strength 91 * before starting to indicate signal change events. 92 */ 93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 94 95 /* 96 * We can have multiple work items (and connection probing) 97 * scheduling this timer, but we need to take care to only 98 * reschedule it when it should fire _earlier_ than it was 99 * asked for before, or if it's not pending right now. This 100 * function ensures that. Note that it then is required to 101 * run this function for all timeouts after the first one 102 * has happened -- the work that runs from this timer will 103 * do that. 104 */ 105 static void run_again(struct ieee80211_sub_if_data *sdata, 106 unsigned long timeout) 107 { 108 sdata_assert_lock(sdata); 109 110 if (!timer_pending(&sdata->u.mgd.timer) || 111 time_before(timeout, sdata->u.mgd.timer.expires)) 112 mod_timer(&sdata->u.mgd.timer, timeout); 113 } 114 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 116 { 117 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 118 return; 119 120 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 121 return; 122 123 mod_timer(&sdata->u.mgd.bcn_mon_timer, 124 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 125 } 126 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 128 { 129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 130 131 if (unlikely(!sdata->u.mgd.associated)) 132 return; 133 134 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 135 return; 136 137 mod_timer(&sdata->u.mgd.conn_mon_timer, 138 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 139 140 ifmgd->probe_send_count = 0; 141 } 142 143 static int ecw2cw(int ecw) 144 { 145 return (1 << ecw) - 1; 146 } 147 148 static u32 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 150 struct ieee80211_supported_band *sband, 151 struct ieee80211_channel *channel, 152 const struct ieee80211_ht_operation *ht_oper, 153 const struct ieee80211_vht_operation *vht_oper, 154 struct cfg80211_chan_def *chandef, bool tracking) 155 { 156 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 157 struct cfg80211_chan_def vht_chandef; 158 u32 ht_cfreq, ret; 159 160 chandef->chan = channel; 161 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 162 chandef->center_freq1 = channel->center_freq; 163 chandef->center_freq2 = 0; 164 165 if (!ht_oper || !sband->ht_cap.ht_supported) { 166 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 167 goto out; 168 } 169 170 chandef->width = NL80211_CHAN_WIDTH_20; 171 172 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 173 channel->band); 174 /* check that channel matches the right operating channel */ 175 if (!tracking && channel->center_freq != ht_cfreq) { 176 /* 177 * It's possible that some APs are confused here; 178 * Netgear WNDR3700 sometimes reports 4 higher than 179 * the actual channel in association responses, but 180 * since we look at probe response/beacon data here 181 * it should be OK. 182 */ 183 sdata_info(sdata, 184 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 185 channel->center_freq, ht_cfreq, 186 ht_oper->primary_chan, channel->band); 187 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 188 goto out; 189 } 190 191 /* check 40 MHz support, if we have it */ 192 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 193 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 194 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 195 chandef->width = NL80211_CHAN_WIDTH_40; 196 chandef->center_freq1 += 10; 197 break; 198 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 199 chandef->width = NL80211_CHAN_WIDTH_40; 200 chandef->center_freq1 -= 10; 201 break; 202 } 203 } else { 204 /* 40 MHz (and 80 MHz) must be supported for VHT */ 205 ret = IEEE80211_STA_DISABLE_VHT; 206 /* also mark 40 MHz disabled */ 207 ret |= IEEE80211_STA_DISABLE_40MHZ; 208 goto out; 209 } 210 211 if (!vht_oper || !sband->vht_cap.vht_supported) { 212 ret = IEEE80211_STA_DISABLE_VHT; 213 goto out; 214 } 215 216 vht_chandef.chan = channel; 217 vht_chandef.center_freq1 = 218 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx, 219 channel->band); 220 vht_chandef.center_freq2 = 0; 221 222 switch (vht_oper->chan_width) { 223 case IEEE80211_VHT_CHANWIDTH_USE_HT: 224 vht_chandef.width = chandef->width; 225 break; 226 case IEEE80211_VHT_CHANWIDTH_80MHZ: 227 vht_chandef.width = NL80211_CHAN_WIDTH_80; 228 break; 229 case IEEE80211_VHT_CHANWIDTH_160MHZ: 230 vht_chandef.width = NL80211_CHAN_WIDTH_160; 231 break; 232 case IEEE80211_VHT_CHANWIDTH_80P80MHZ: 233 vht_chandef.width = NL80211_CHAN_WIDTH_80P80; 234 vht_chandef.center_freq2 = 235 ieee80211_channel_to_frequency( 236 vht_oper->center_freq_seg2_idx, 237 channel->band); 238 break; 239 default: 240 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 241 sdata_info(sdata, 242 "AP VHT operation IE has invalid channel width (%d), disable VHT\n", 243 vht_oper->chan_width); 244 ret = IEEE80211_STA_DISABLE_VHT; 245 goto out; 246 } 247 248 if (!cfg80211_chandef_valid(&vht_chandef)) { 249 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 250 sdata_info(sdata, 251 "AP VHT information is invalid, disable VHT\n"); 252 ret = IEEE80211_STA_DISABLE_VHT; 253 goto out; 254 } 255 256 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 257 ret = 0; 258 goto out; 259 } 260 261 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 262 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 263 sdata_info(sdata, 264 "AP VHT information doesn't match HT, disable VHT\n"); 265 ret = IEEE80211_STA_DISABLE_VHT; 266 goto out; 267 } 268 269 *chandef = vht_chandef; 270 271 ret = 0; 272 273 out: 274 /* don't print the message below for VHT mismatch if VHT is disabled */ 275 if (ret & IEEE80211_STA_DISABLE_VHT) 276 vht_chandef = *chandef; 277 278 /* 279 * Ignore the DISABLED flag when we're already connected and only 280 * tracking the APs beacon for bandwidth changes - otherwise we 281 * might get disconnected here if we connect to an AP, update our 282 * regulatory information based on the AP's country IE and the 283 * information we have is wrong/outdated and disables the channel 284 * that we're actually using for the connection to the AP. 285 */ 286 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 287 tracking ? 0 : 288 IEEE80211_CHAN_DISABLED)) { 289 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 290 ret = IEEE80211_STA_DISABLE_HT | 291 IEEE80211_STA_DISABLE_VHT; 292 break; 293 } 294 295 ret |= ieee80211_chandef_downgrade(chandef); 296 } 297 298 if (chandef->width != vht_chandef.width && !tracking) 299 sdata_info(sdata, 300 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 301 302 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 303 return ret; 304 } 305 306 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 307 struct sta_info *sta, 308 const struct ieee80211_ht_operation *ht_oper, 309 const struct ieee80211_vht_operation *vht_oper, 310 const u8 *bssid, u32 *changed) 311 { 312 struct ieee80211_local *local = sdata->local; 313 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 314 struct ieee80211_supported_band *sband; 315 struct ieee80211_channel *chan; 316 struct cfg80211_chan_def chandef; 317 u16 ht_opmode; 318 u32 flags; 319 enum ieee80211_sta_rx_bandwidth new_sta_bw; 320 int ret; 321 322 /* if HT was/is disabled, don't track any bandwidth changes */ 323 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 324 return 0; 325 326 /* don't check VHT if we associated as non-VHT station */ 327 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 328 vht_oper = NULL; 329 330 if (WARN_ON_ONCE(!sta)) 331 return -EINVAL; 332 333 /* 334 * if bss configuration changed store the new one - 335 * this may be applicable even if channel is identical 336 */ 337 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 338 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 339 *changed |= BSS_CHANGED_HT; 340 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 341 } 342 343 chan = sdata->vif.bss_conf.chandef.chan; 344 sband = local->hw.wiphy->bands[chan->band]; 345 346 /* calculate new channel (type) based on HT/VHT operation IEs */ 347 flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper, 348 vht_oper, &chandef, true); 349 350 /* 351 * Downgrade the new channel if we associated with restricted 352 * capabilities. For example, if we associated as a 20 MHz STA 353 * to a 40 MHz AP (due to regulatory, capabilities or config 354 * reasons) then switching to a 40 MHz channel now won't do us 355 * any good -- we couldn't use it with the AP. 356 */ 357 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 358 chandef.width == NL80211_CHAN_WIDTH_80P80) 359 flags |= ieee80211_chandef_downgrade(&chandef); 360 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 361 chandef.width == NL80211_CHAN_WIDTH_160) 362 flags |= ieee80211_chandef_downgrade(&chandef); 363 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 364 chandef.width > NL80211_CHAN_WIDTH_20) 365 flags |= ieee80211_chandef_downgrade(&chandef); 366 367 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 368 return 0; 369 370 sdata_info(sdata, 371 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 372 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 373 chandef.center_freq1, chandef.center_freq2); 374 375 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 376 IEEE80211_STA_DISABLE_VHT | 377 IEEE80211_STA_DISABLE_40MHZ | 378 IEEE80211_STA_DISABLE_80P80MHZ | 379 IEEE80211_STA_DISABLE_160MHZ)) || 380 !cfg80211_chandef_valid(&chandef)) { 381 sdata_info(sdata, 382 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 383 ifmgd->bssid); 384 return -EINVAL; 385 } 386 387 switch (chandef.width) { 388 case NL80211_CHAN_WIDTH_20_NOHT: 389 case NL80211_CHAN_WIDTH_20: 390 new_sta_bw = IEEE80211_STA_RX_BW_20; 391 break; 392 case NL80211_CHAN_WIDTH_40: 393 new_sta_bw = IEEE80211_STA_RX_BW_40; 394 break; 395 case NL80211_CHAN_WIDTH_80: 396 new_sta_bw = IEEE80211_STA_RX_BW_80; 397 break; 398 case NL80211_CHAN_WIDTH_80P80: 399 case NL80211_CHAN_WIDTH_160: 400 new_sta_bw = IEEE80211_STA_RX_BW_160; 401 break; 402 default: 403 return -EINVAL; 404 } 405 406 if (new_sta_bw > sta->cur_max_bandwidth) 407 new_sta_bw = sta->cur_max_bandwidth; 408 409 if (new_sta_bw < sta->sta.bandwidth) { 410 sta->sta.bandwidth = new_sta_bw; 411 rate_control_rate_update(local, sband, sta, 412 IEEE80211_RC_BW_CHANGED); 413 } 414 415 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 416 if (ret) { 417 sdata_info(sdata, 418 "AP %pM changed bandwidth to incompatible one - disconnect\n", 419 ifmgd->bssid); 420 return ret; 421 } 422 423 if (new_sta_bw > sta->sta.bandwidth) { 424 sta->sta.bandwidth = new_sta_bw; 425 rate_control_rate_update(local, sband, sta, 426 IEEE80211_RC_BW_CHANGED); 427 } 428 429 return 0; 430 } 431 432 /* frame sending functions */ 433 434 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 435 struct sk_buff *skb, u8 ap_ht_param, 436 struct ieee80211_supported_band *sband, 437 struct ieee80211_channel *channel, 438 enum ieee80211_smps_mode smps) 439 { 440 u8 *pos; 441 u32 flags = channel->flags; 442 u16 cap; 443 struct ieee80211_sta_ht_cap ht_cap; 444 445 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 446 447 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 448 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 449 450 /* determine capability flags */ 451 cap = ht_cap.cap; 452 453 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 454 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 455 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 456 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 457 cap &= ~IEEE80211_HT_CAP_SGI_40; 458 } 459 break; 460 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 461 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 462 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 463 cap &= ~IEEE80211_HT_CAP_SGI_40; 464 } 465 break; 466 } 467 468 /* 469 * If 40 MHz was disabled associate as though we weren't 470 * capable of 40 MHz -- some broken APs will never fall 471 * back to trying to transmit in 20 MHz. 472 */ 473 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 474 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 475 cap &= ~IEEE80211_HT_CAP_SGI_40; 476 } 477 478 /* set SM PS mode properly */ 479 cap &= ~IEEE80211_HT_CAP_SM_PS; 480 switch (smps) { 481 case IEEE80211_SMPS_AUTOMATIC: 482 case IEEE80211_SMPS_NUM_MODES: 483 WARN_ON(1); 484 case IEEE80211_SMPS_OFF: 485 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 486 IEEE80211_HT_CAP_SM_PS_SHIFT; 487 break; 488 case IEEE80211_SMPS_STATIC: 489 cap |= WLAN_HT_CAP_SM_PS_STATIC << 490 IEEE80211_HT_CAP_SM_PS_SHIFT; 491 break; 492 case IEEE80211_SMPS_DYNAMIC: 493 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 494 IEEE80211_HT_CAP_SM_PS_SHIFT; 495 break; 496 } 497 498 /* reserve and fill IE */ 499 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 500 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 501 } 502 503 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 504 struct sk_buff *skb, 505 struct ieee80211_supported_band *sband, 506 struct ieee80211_vht_cap *ap_vht_cap) 507 { 508 u8 *pos; 509 u32 cap; 510 struct ieee80211_sta_vht_cap vht_cap; 511 512 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 513 514 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 515 ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); 516 517 /* determine capability flags */ 518 cap = vht_cap.cap; 519 520 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 521 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ; 522 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 523 } 524 525 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 526 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 527 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 528 } 529 530 /* 531 * Some APs apparently get confused if our capabilities are better 532 * than theirs, so restrict what we advertise in the assoc request. 533 */ 534 if (!(ap_vht_cap->vht_cap_info & 535 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 536 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE; 537 538 /* reserve and fill IE */ 539 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 540 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 541 } 542 543 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 544 { 545 struct ieee80211_local *local = sdata->local; 546 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 547 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 548 struct sk_buff *skb; 549 struct ieee80211_mgmt *mgmt; 550 u8 *pos, qos_info; 551 size_t offset = 0, noffset; 552 int i, count, rates_len, supp_rates_len, shift; 553 u16 capab; 554 struct ieee80211_supported_band *sband; 555 struct ieee80211_chanctx_conf *chanctx_conf; 556 struct ieee80211_channel *chan; 557 u32 rate_flags, rates = 0; 558 559 sdata_assert_lock(sdata); 560 561 rcu_read_lock(); 562 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 563 if (WARN_ON(!chanctx_conf)) { 564 rcu_read_unlock(); 565 return; 566 } 567 chan = chanctx_conf->def.chan; 568 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 569 rcu_read_unlock(); 570 sband = local->hw.wiphy->bands[chan->band]; 571 shift = ieee80211_vif_get_shift(&sdata->vif); 572 573 if (assoc_data->supp_rates_len) { 574 /* 575 * Get all rates supported by the device and the AP as 576 * some APs don't like getting a superset of their rates 577 * in the association request (e.g. D-Link DAP 1353 in 578 * b-only mode)... 579 */ 580 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband, 581 assoc_data->supp_rates, 582 assoc_data->supp_rates_len, 583 &rates); 584 } else { 585 /* 586 * In case AP not provide any supported rates information 587 * before association, we send information element(s) with 588 * all rates that we support. 589 */ 590 rates_len = 0; 591 for (i = 0; i < sband->n_bitrates; i++) { 592 if ((rate_flags & sband->bitrates[i].flags) 593 != rate_flags) 594 continue; 595 rates |= BIT(i); 596 rates_len++; 597 } 598 } 599 600 skb = alloc_skb(local->hw.extra_tx_headroom + 601 sizeof(*mgmt) + /* bit too much but doesn't matter */ 602 2 + assoc_data->ssid_len + /* SSID */ 603 4 + rates_len + /* (extended) rates */ 604 4 + /* power capability */ 605 2 + 2 * sband->n_channels + /* supported channels */ 606 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 607 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 608 assoc_data->ie_len + /* extra IEs */ 609 9, /* WMM */ 610 GFP_KERNEL); 611 if (!skb) 612 return; 613 614 skb_reserve(skb, local->hw.extra_tx_headroom); 615 616 capab = WLAN_CAPABILITY_ESS; 617 618 if (sband->band == IEEE80211_BAND_2GHZ) { 619 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 620 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 621 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 622 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 623 } 624 625 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 626 capab |= WLAN_CAPABILITY_PRIVACY; 627 628 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 629 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 630 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 631 632 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 633 memset(mgmt, 0, 24); 634 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 635 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 636 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 637 638 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 639 skb_put(skb, 10); 640 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 641 IEEE80211_STYPE_REASSOC_REQ); 642 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 643 mgmt->u.reassoc_req.listen_interval = 644 cpu_to_le16(local->hw.conf.listen_interval); 645 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 646 ETH_ALEN); 647 } else { 648 skb_put(skb, 4); 649 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 650 IEEE80211_STYPE_ASSOC_REQ); 651 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 652 mgmt->u.assoc_req.listen_interval = 653 cpu_to_le16(local->hw.conf.listen_interval); 654 } 655 656 /* SSID */ 657 pos = skb_put(skb, 2 + assoc_data->ssid_len); 658 *pos++ = WLAN_EID_SSID; 659 *pos++ = assoc_data->ssid_len; 660 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 661 662 /* add all rates which were marked to be used above */ 663 supp_rates_len = rates_len; 664 if (supp_rates_len > 8) 665 supp_rates_len = 8; 666 667 pos = skb_put(skb, supp_rates_len + 2); 668 *pos++ = WLAN_EID_SUPP_RATES; 669 *pos++ = supp_rates_len; 670 671 count = 0; 672 for (i = 0; i < sband->n_bitrates; i++) { 673 if (BIT(i) & rates) { 674 int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 675 5 * (1 << shift)); 676 *pos++ = (u8) rate; 677 if (++count == 8) 678 break; 679 } 680 } 681 682 if (rates_len > count) { 683 pos = skb_put(skb, rates_len - count + 2); 684 *pos++ = WLAN_EID_EXT_SUPP_RATES; 685 *pos++ = rates_len - count; 686 687 for (i++; i < sband->n_bitrates; i++) { 688 if (BIT(i) & rates) { 689 int rate; 690 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 691 5 * (1 << shift)); 692 *pos++ = (u8) rate; 693 } 694 } 695 } 696 697 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 698 /* 1. power capabilities */ 699 pos = skb_put(skb, 4); 700 *pos++ = WLAN_EID_PWR_CAPABILITY; 701 *pos++ = 2; 702 *pos++ = 0; /* min tx power */ 703 /* max tx power */ 704 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def); 705 706 /* 2. supported channels */ 707 /* TODO: get this in reg domain format */ 708 pos = skb_put(skb, 2 * sband->n_channels + 2); 709 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 710 *pos++ = 2 * sband->n_channels; 711 for (i = 0; i < sband->n_channels; i++) { 712 *pos++ = ieee80211_frequency_to_channel( 713 sband->channels[i].center_freq); 714 *pos++ = 1; /* one channel in the subband*/ 715 } 716 } 717 718 /* if present, add any custom IEs that go before HT */ 719 if (assoc_data->ie_len) { 720 static const u8 before_ht[] = { 721 WLAN_EID_SSID, 722 WLAN_EID_SUPP_RATES, 723 WLAN_EID_EXT_SUPP_RATES, 724 WLAN_EID_PWR_CAPABILITY, 725 WLAN_EID_SUPPORTED_CHANNELS, 726 WLAN_EID_RSN, 727 WLAN_EID_QOS_CAPA, 728 WLAN_EID_RRM_ENABLED_CAPABILITIES, 729 WLAN_EID_MOBILITY_DOMAIN, 730 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 731 }; 732 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 733 before_ht, ARRAY_SIZE(before_ht), 734 offset); 735 pos = skb_put(skb, noffset - offset); 736 memcpy(pos, assoc_data->ie + offset, noffset - offset); 737 offset = noffset; 738 } 739 740 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 741 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 742 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 743 744 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 745 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 746 sband, chan, sdata->smps_mode); 747 748 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 749 ieee80211_add_vht_ie(sdata, skb, sband, 750 &assoc_data->ap_vht_cap); 751 752 /* if present, add any custom non-vendor IEs that go after HT */ 753 if (assoc_data->ie_len) { 754 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 755 assoc_data->ie_len, 756 offset); 757 pos = skb_put(skb, noffset - offset); 758 memcpy(pos, assoc_data->ie + offset, noffset - offset); 759 offset = noffset; 760 } 761 762 if (assoc_data->wmm) { 763 if (assoc_data->uapsd) { 764 qos_info = ifmgd->uapsd_queues; 765 qos_info |= (ifmgd->uapsd_max_sp_len << 766 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 767 } else { 768 qos_info = 0; 769 } 770 771 pos = skb_put(skb, 9); 772 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 773 *pos++ = 7; /* len */ 774 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 775 *pos++ = 0x50; 776 *pos++ = 0xf2; 777 *pos++ = 2; /* WME */ 778 *pos++ = 0; /* WME info */ 779 *pos++ = 1; /* WME ver */ 780 *pos++ = qos_info; 781 } 782 783 /* add any remaining custom (i.e. vendor specific here) IEs */ 784 if (assoc_data->ie_len) { 785 noffset = assoc_data->ie_len; 786 pos = skb_put(skb, noffset - offset); 787 memcpy(pos, assoc_data->ie + offset, noffset - offset); 788 } 789 790 drv_mgd_prepare_tx(local, sdata); 791 792 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 793 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 794 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 795 IEEE80211_TX_INTFL_MLME_CONN_TX; 796 ieee80211_tx_skb(sdata, skb); 797 } 798 799 void ieee80211_send_pspoll(struct ieee80211_local *local, 800 struct ieee80211_sub_if_data *sdata) 801 { 802 struct ieee80211_pspoll *pspoll; 803 struct sk_buff *skb; 804 805 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 806 if (!skb) 807 return; 808 809 pspoll = (struct ieee80211_pspoll *) skb->data; 810 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 811 812 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 813 ieee80211_tx_skb(sdata, skb); 814 } 815 816 void ieee80211_send_nullfunc(struct ieee80211_local *local, 817 struct ieee80211_sub_if_data *sdata, 818 int powersave) 819 { 820 struct sk_buff *skb; 821 struct ieee80211_hdr_3addr *nullfunc; 822 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 823 824 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 825 if (!skb) 826 return; 827 828 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 829 if (powersave) 830 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 831 832 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 833 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 834 835 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 836 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 837 838 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 839 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 840 841 ieee80211_tx_skb(sdata, skb); 842 } 843 844 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 845 struct ieee80211_sub_if_data *sdata) 846 { 847 struct sk_buff *skb; 848 struct ieee80211_hdr *nullfunc; 849 __le16 fc; 850 851 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 852 return; 853 854 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 855 if (!skb) 856 return; 857 858 skb_reserve(skb, local->hw.extra_tx_headroom); 859 860 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 861 memset(nullfunc, 0, 30); 862 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 863 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 864 nullfunc->frame_control = fc; 865 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 866 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 867 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 868 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 869 870 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 871 ieee80211_tx_skb(sdata, skb); 872 } 873 874 /* spectrum management related things */ 875 static void ieee80211_chswitch_work(struct work_struct *work) 876 { 877 struct ieee80211_sub_if_data *sdata = 878 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 879 struct ieee80211_local *local = sdata->local; 880 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 881 u32 changed = 0; 882 int ret; 883 884 if (!ieee80211_sdata_running(sdata)) 885 return; 886 887 sdata_lock(sdata); 888 if (!ifmgd->associated) 889 goto out; 890 891 mutex_lock(&local->mtx); 892 ret = ieee80211_vif_change_channel(sdata, &changed); 893 mutex_unlock(&local->mtx); 894 if (ret) { 895 sdata_info(sdata, 896 "vif channel switch failed, disconnecting\n"); 897 ieee80211_queue_work(&sdata->local->hw, 898 &ifmgd->csa_connection_drop_work); 899 goto out; 900 } 901 902 if (!local->use_chanctx) { 903 local->_oper_chandef = sdata->csa_chandef; 904 /* Call "hw_config" only if doing sw channel switch. 905 * Otherwise update the channel directly 906 */ 907 if (!local->ops->channel_switch) 908 ieee80211_hw_config(local, 0); 909 else 910 local->hw.conf.chandef = local->_oper_chandef; 911 } 912 913 /* XXX: shouldn't really modify cfg80211-owned data! */ 914 ifmgd->associated->channel = sdata->csa_chandef.chan; 915 916 /* XXX: wait for a beacon first? */ 917 ieee80211_wake_queues_by_reason(&local->hw, 918 IEEE80211_MAX_QUEUE_MAP, 919 IEEE80211_QUEUE_STOP_REASON_CSA); 920 921 ieee80211_bss_info_change_notify(sdata, changed); 922 923 out: 924 sdata->vif.csa_active = false; 925 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 926 sdata_unlock(sdata); 927 } 928 929 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 930 { 931 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 932 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 933 934 trace_api_chswitch_done(sdata, success); 935 if (!success) { 936 sdata_info(sdata, 937 "driver channel switch failed, disconnecting\n"); 938 ieee80211_queue_work(&sdata->local->hw, 939 &ifmgd->csa_connection_drop_work); 940 } else { 941 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 942 } 943 } 944 EXPORT_SYMBOL(ieee80211_chswitch_done); 945 946 static void ieee80211_chswitch_timer(unsigned long data) 947 { 948 struct ieee80211_sub_if_data *sdata = 949 (struct ieee80211_sub_if_data *) data; 950 951 ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); 952 } 953 954 static void 955 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 956 u64 timestamp, struct ieee802_11_elems *elems, 957 bool beacon) 958 { 959 struct ieee80211_local *local = sdata->local; 960 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 961 struct cfg80211_bss *cbss = ifmgd->associated; 962 struct ieee80211_chanctx *chanctx; 963 enum ieee80211_band current_band; 964 struct ieee80211_csa_ie csa_ie; 965 int res; 966 967 sdata_assert_lock(sdata); 968 969 if (!cbss) 970 return; 971 972 if (local->scanning) 973 return; 974 975 /* disregard subsequent announcements if we are already processing */ 976 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 977 return; 978 979 current_band = cbss->channel->band; 980 memset(&csa_ie, 0, sizeof(csa_ie)); 981 res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band, 982 ifmgd->flags, 983 ifmgd->associated->bssid, &csa_ie); 984 if (res < 0) 985 ieee80211_queue_work(&local->hw, 986 &ifmgd->csa_connection_drop_work); 987 if (res) 988 return; 989 990 if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef, 991 IEEE80211_CHAN_DISABLED)) { 992 sdata_info(sdata, 993 "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 994 ifmgd->associated->bssid, 995 csa_ie.chandef.chan->center_freq, 996 csa_ie.chandef.width, csa_ie.chandef.center_freq1, 997 csa_ie.chandef.center_freq2); 998 ieee80211_queue_work(&local->hw, 999 &ifmgd->csa_connection_drop_work); 1000 return; 1001 } 1002 1003 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 1004 sdata->vif.csa_active = true; 1005 1006 mutex_lock(&local->chanctx_mtx); 1007 if (local->use_chanctx) { 1008 u32 num_chanctx = 0; 1009 list_for_each_entry(chanctx, &local->chanctx_list, list) 1010 num_chanctx++; 1011 1012 if (num_chanctx > 1 || 1013 !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) { 1014 sdata_info(sdata, 1015 "not handling chan-switch with channel contexts\n"); 1016 ieee80211_queue_work(&local->hw, 1017 &ifmgd->csa_connection_drop_work); 1018 mutex_unlock(&local->chanctx_mtx); 1019 return; 1020 } 1021 } 1022 1023 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) { 1024 ieee80211_queue_work(&local->hw, 1025 &ifmgd->csa_connection_drop_work); 1026 mutex_unlock(&local->chanctx_mtx); 1027 return; 1028 } 1029 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf), 1030 struct ieee80211_chanctx, conf); 1031 if (chanctx->refcount > 1) { 1032 sdata_info(sdata, 1033 "channel switch with multiple interfaces on the same channel, disconnecting\n"); 1034 ieee80211_queue_work(&local->hw, 1035 &ifmgd->csa_connection_drop_work); 1036 mutex_unlock(&local->chanctx_mtx); 1037 return; 1038 } 1039 mutex_unlock(&local->chanctx_mtx); 1040 1041 sdata->csa_chandef = csa_ie.chandef; 1042 1043 if (csa_ie.mode) 1044 ieee80211_stop_queues_by_reason(&local->hw, 1045 IEEE80211_MAX_QUEUE_MAP, 1046 IEEE80211_QUEUE_STOP_REASON_CSA); 1047 1048 if (local->ops->channel_switch) { 1049 /* use driver's channel switch callback */ 1050 struct ieee80211_channel_switch ch_switch = { 1051 .timestamp = timestamp, 1052 .block_tx = csa_ie.mode, 1053 .chandef = csa_ie.chandef, 1054 .count = csa_ie.count, 1055 }; 1056 1057 drv_channel_switch(local, &ch_switch); 1058 return; 1059 } 1060 1061 /* channel switch handled in software */ 1062 if (csa_ie.count <= 1) 1063 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); 1064 else 1065 mod_timer(&ifmgd->chswitch_timer, 1066 TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval)); 1067 } 1068 1069 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1070 struct ieee80211_channel *channel, 1071 const u8 *country_ie, u8 country_ie_len, 1072 const u8 *pwr_constr_elem) 1073 { 1074 struct ieee80211_country_ie_triplet *triplet; 1075 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1076 int i, chan_pwr, chan_increment, new_ap_level; 1077 bool have_chan_pwr = false; 1078 1079 /* Invalid IE */ 1080 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1081 return 0; 1082 1083 triplet = (void *)(country_ie + 3); 1084 country_ie_len -= 3; 1085 1086 switch (channel->band) { 1087 default: 1088 WARN_ON_ONCE(1); 1089 /* fall through */ 1090 case IEEE80211_BAND_2GHZ: 1091 case IEEE80211_BAND_60GHZ: 1092 chan_increment = 1; 1093 break; 1094 case IEEE80211_BAND_5GHZ: 1095 chan_increment = 4; 1096 break; 1097 } 1098 1099 /* find channel */ 1100 while (country_ie_len >= 3) { 1101 u8 first_channel = triplet->chans.first_channel; 1102 1103 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1104 goto next; 1105 1106 for (i = 0; i < triplet->chans.num_channels; i++) { 1107 if (first_channel + i * chan_increment == chan) { 1108 have_chan_pwr = true; 1109 chan_pwr = triplet->chans.max_power; 1110 break; 1111 } 1112 } 1113 if (have_chan_pwr) 1114 break; 1115 1116 next: 1117 triplet++; 1118 country_ie_len -= 3; 1119 } 1120 1121 if (!have_chan_pwr) 1122 return 0; 1123 1124 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem); 1125 1126 if (sdata->ap_power_level == new_ap_level) 1127 return 0; 1128 1129 sdata_info(sdata, 1130 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1131 new_ap_level, chan_pwr, *pwr_constr_elem, 1132 sdata->u.mgd.bssid); 1133 sdata->ap_power_level = new_ap_level; 1134 if (__ieee80211_recalc_txpower(sdata)) 1135 return BSS_CHANGED_TXPOWER; 1136 return 0; 1137 } 1138 1139 /* powersave */ 1140 static void ieee80211_enable_ps(struct ieee80211_local *local, 1141 struct ieee80211_sub_if_data *sdata) 1142 { 1143 struct ieee80211_conf *conf = &local->hw.conf; 1144 1145 /* 1146 * If we are scanning right now then the parameters will 1147 * take effect when scan finishes. 1148 */ 1149 if (local->scanning) 1150 return; 1151 1152 if (conf->dynamic_ps_timeout > 0 && 1153 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 1154 mod_timer(&local->dynamic_ps_timer, jiffies + 1155 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1156 } else { 1157 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1158 ieee80211_send_nullfunc(local, sdata, 1); 1159 1160 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1161 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 1162 return; 1163 1164 conf->flags |= IEEE80211_CONF_PS; 1165 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1166 } 1167 } 1168 1169 static void ieee80211_change_ps(struct ieee80211_local *local) 1170 { 1171 struct ieee80211_conf *conf = &local->hw.conf; 1172 1173 if (local->ps_sdata) { 1174 ieee80211_enable_ps(local, local->ps_sdata); 1175 } else if (conf->flags & IEEE80211_CONF_PS) { 1176 conf->flags &= ~IEEE80211_CONF_PS; 1177 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1178 del_timer_sync(&local->dynamic_ps_timer); 1179 cancel_work_sync(&local->dynamic_ps_enable_work); 1180 } 1181 } 1182 1183 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1184 { 1185 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1186 struct sta_info *sta = NULL; 1187 bool authorized = false; 1188 1189 if (!mgd->powersave) 1190 return false; 1191 1192 if (mgd->broken_ap) 1193 return false; 1194 1195 if (!mgd->associated) 1196 return false; 1197 1198 if (mgd->flags & IEEE80211_STA_CONNECTION_POLL) 1199 return false; 1200 1201 if (!mgd->have_beacon) 1202 return false; 1203 1204 rcu_read_lock(); 1205 sta = sta_info_get(sdata, mgd->bssid); 1206 if (sta) 1207 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1208 rcu_read_unlock(); 1209 1210 return authorized; 1211 } 1212 1213 /* need to hold RTNL or interface lock */ 1214 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 1215 { 1216 struct ieee80211_sub_if_data *sdata, *found = NULL; 1217 int count = 0; 1218 int timeout; 1219 1220 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 1221 local->ps_sdata = NULL; 1222 return; 1223 } 1224 1225 list_for_each_entry(sdata, &local->interfaces, list) { 1226 if (!ieee80211_sdata_running(sdata)) 1227 continue; 1228 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1229 /* If an AP vif is found, then disable PS 1230 * by setting the count to zero thereby setting 1231 * ps_sdata to NULL. 1232 */ 1233 count = 0; 1234 break; 1235 } 1236 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1237 continue; 1238 found = sdata; 1239 count++; 1240 } 1241 1242 if (count == 1 && ieee80211_powersave_allowed(found)) { 1243 s32 beaconint_us; 1244 1245 if (latency < 0) 1246 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 1247 1248 beaconint_us = ieee80211_tu_to_usec( 1249 found->vif.bss_conf.beacon_int); 1250 1251 timeout = local->dynamic_ps_forced_timeout; 1252 if (timeout < 0) { 1253 /* 1254 * Go to full PSM if the user configures a very low 1255 * latency requirement. 1256 * The 2000 second value is there for compatibility 1257 * until the PM_QOS_NETWORK_LATENCY is configured 1258 * with real values. 1259 */ 1260 if (latency > (1900 * USEC_PER_MSEC) && 1261 latency != (2000 * USEC_PER_SEC)) 1262 timeout = 0; 1263 else 1264 timeout = 100; 1265 } 1266 local->hw.conf.dynamic_ps_timeout = timeout; 1267 1268 if (beaconint_us > latency) { 1269 local->ps_sdata = NULL; 1270 } else { 1271 int maxslp = 1; 1272 u8 dtimper = found->u.mgd.dtim_period; 1273 1274 /* If the TIM IE is invalid, pretend the value is 1 */ 1275 if (!dtimper) 1276 dtimper = 1; 1277 else if (dtimper > 1) 1278 maxslp = min_t(int, dtimper, 1279 latency / beaconint_us); 1280 1281 local->hw.conf.max_sleep_period = maxslp; 1282 local->hw.conf.ps_dtim_period = dtimper; 1283 local->ps_sdata = found; 1284 } 1285 } else { 1286 local->ps_sdata = NULL; 1287 } 1288 1289 ieee80211_change_ps(local); 1290 } 1291 1292 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1293 { 1294 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1295 1296 if (sdata->vif.bss_conf.ps != ps_allowed) { 1297 sdata->vif.bss_conf.ps = ps_allowed; 1298 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1299 } 1300 } 1301 1302 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1303 { 1304 struct ieee80211_local *local = 1305 container_of(work, struct ieee80211_local, 1306 dynamic_ps_disable_work); 1307 1308 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1309 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1310 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1311 } 1312 1313 ieee80211_wake_queues_by_reason(&local->hw, 1314 IEEE80211_MAX_QUEUE_MAP, 1315 IEEE80211_QUEUE_STOP_REASON_PS); 1316 } 1317 1318 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1319 { 1320 struct ieee80211_local *local = 1321 container_of(work, struct ieee80211_local, 1322 dynamic_ps_enable_work); 1323 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1324 struct ieee80211_if_managed *ifmgd; 1325 unsigned long flags; 1326 int q; 1327 1328 /* can only happen when PS was just disabled anyway */ 1329 if (!sdata) 1330 return; 1331 1332 ifmgd = &sdata->u.mgd; 1333 1334 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1335 return; 1336 1337 if (local->hw.conf.dynamic_ps_timeout > 0) { 1338 /* don't enter PS if TX frames are pending */ 1339 if (drv_tx_frames_pending(local)) { 1340 mod_timer(&local->dynamic_ps_timer, jiffies + 1341 msecs_to_jiffies( 1342 local->hw.conf.dynamic_ps_timeout)); 1343 return; 1344 } 1345 1346 /* 1347 * transmission can be stopped by others which leads to 1348 * dynamic_ps_timer expiry. Postpone the ps timer if it 1349 * is not the actual idle state. 1350 */ 1351 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1352 for (q = 0; q < local->hw.queues; q++) { 1353 if (local->queue_stop_reasons[q]) { 1354 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1355 flags); 1356 mod_timer(&local->dynamic_ps_timer, jiffies + 1357 msecs_to_jiffies( 1358 local->hw.conf.dynamic_ps_timeout)); 1359 return; 1360 } 1361 } 1362 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1363 } 1364 1365 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1366 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1367 if (drv_tx_frames_pending(local)) { 1368 mod_timer(&local->dynamic_ps_timer, jiffies + 1369 msecs_to_jiffies( 1370 local->hw.conf.dynamic_ps_timeout)); 1371 } else { 1372 ieee80211_send_nullfunc(local, sdata, 1); 1373 /* Flush to get the tx status of nullfunc frame */ 1374 ieee80211_flush_queues(local, sdata); 1375 } 1376 } 1377 1378 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 1379 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 1380 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1381 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1382 local->hw.conf.flags |= IEEE80211_CONF_PS; 1383 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1384 } 1385 } 1386 1387 void ieee80211_dynamic_ps_timer(unsigned long data) 1388 { 1389 struct ieee80211_local *local = (void *) data; 1390 1391 if (local->quiescing || local->suspended) 1392 return; 1393 1394 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1395 } 1396 1397 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1398 { 1399 struct delayed_work *delayed_work = 1400 container_of(work, struct delayed_work, work); 1401 struct ieee80211_sub_if_data *sdata = 1402 container_of(delayed_work, struct ieee80211_sub_if_data, 1403 dfs_cac_timer_work); 1404 struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef; 1405 1406 mutex_lock(&sdata->local->mtx); 1407 if (sdata->wdev.cac_started) { 1408 ieee80211_vif_release_channel(sdata); 1409 cfg80211_cac_event(sdata->dev, &chandef, 1410 NL80211_RADAR_CAC_FINISHED, 1411 GFP_KERNEL); 1412 } 1413 mutex_unlock(&sdata->local->mtx); 1414 } 1415 1416 /* MLME */ 1417 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1418 struct ieee80211_sub_if_data *sdata, 1419 const u8 *wmm_param, size_t wmm_param_len) 1420 { 1421 struct ieee80211_tx_queue_params params; 1422 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1423 size_t left; 1424 int count; 1425 const u8 *pos; 1426 u8 uapsd_queues = 0; 1427 1428 if (!local->ops->conf_tx) 1429 return false; 1430 1431 if (local->hw.queues < IEEE80211_NUM_ACS) 1432 return false; 1433 1434 if (!wmm_param) 1435 return false; 1436 1437 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1438 return false; 1439 1440 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1441 uapsd_queues = ifmgd->uapsd_queues; 1442 1443 count = wmm_param[6] & 0x0f; 1444 if (count == ifmgd->wmm_last_param_set) 1445 return false; 1446 ifmgd->wmm_last_param_set = count; 1447 1448 pos = wmm_param + 8; 1449 left = wmm_param_len - 8; 1450 1451 memset(¶ms, 0, sizeof(params)); 1452 1453 sdata->wmm_acm = 0; 1454 for (; left >= 4; left -= 4, pos += 4) { 1455 int aci = (pos[0] >> 5) & 0x03; 1456 int acm = (pos[0] >> 4) & 0x01; 1457 bool uapsd = false; 1458 int queue; 1459 1460 switch (aci) { 1461 case 1: /* AC_BK */ 1462 queue = 3; 1463 if (acm) 1464 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1465 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1466 uapsd = true; 1467 break; 1468 case 2: /* AC_VI */ 1469 queue = 1; 1470 if (acm) 1471 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1472 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1473 uapsd = true; 1474 break; 1475 case 3: /* AC_VO */ 1476 queue = 0; 1477 if (acm) 1478 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1479 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1480 uapsd = true; 1481 break; 1482 case 0: /* AC_BE */ 1483 default: 1484 queue = 2; 1485 if (acm) 1486 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1487 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1488 uapsd = true; 1489 break; 1490 } 1491 1492 params.aifs = pos[0] & 0x0f; 1493 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1494 params.cw_min = ecw2cw(pos[1] & 0x0f); 1495 params.txop = get_unaligned_le16(pos + 2); 1496 params.acm = acm; 1497 params.uapsd = uapsd; 1498 1499 mlme_dbg(sdata, 1500 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 1501 queue, aci, acm, 1502 params.aifs, params.cw_min, params.cw_max, 1503 params.txop, params.uapsd); 1504 sdata->tx_conf[queue] = params; 1505 if (drv_conf_tx(local, sdata, queue, ¶ms)) 1506 sdata_err(sdata, 1507 "failed to set TX queue parameters for queue %d\n", 1508 queue); 1509 } 1510 1511 /* enable WMM or activate new settings */ 1512 sdata->vif.bss_conf.qos = true; 1513 return true; 1514 } 1515 1516 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1517 { 1518 lockdep_assert_held(&sdata->local->mtx); 1519 1520 sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL; 1521 ieee80211_run_deferred_scan(sdata->local); 1522 } 1523 1524 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1525 { 1526 mutex_lock(&sdata->local->mtx); 1527 __ieee80211_stop_poll(sdata); 1528 mutex_unlock(&sdata->local->mtx); 1529 } 1530 1531 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1532 u16 capab, bool erp_valid, u8 erp) 1533 { 1534 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1535 u32 changed = 0; 1536 bool use_protection; 1537 bool use_short_preamble; 1538 bool use_short_slot; 1539 1540 if (erp_valid) { 1541 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1542 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1543 } else { 1544 use_protection = false; 1545 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1546 } 1547 1548 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1549 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1550 use_short_slot = true; 1551 1552 if (use_protection != bss_conf->use_cts_prot) { 1553 bss_conf->use_cts_prot = use_protection; 1554 changed |= BSS_CHANGED_ERP_CTS_PROT; 1555 } 1556 1557 if (use_short_preamble != bss_conf->use_short_preamble) { 1558 bss_conf->use_short_preamble = use_short_preamble; 1559 changed |= BSS_CHANGED_ERP_PREAMBLE; 1560 } 1561 1562 if (use_short_slot != bss_conf->use_short_slot) { 1563 bss_conf->use_short_slot = use_short_slot; 1564 changed |= BSS_CHANGED_ERP_SLOT; 1565 } 1566 1567 return changed; 1568 } 1569 1570 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1571 struct cfg80211_bss *cbss, 1572 u32 bss_info_changed) 1573 { 1574 struct ieee80211_bss *bss = (void *)cbss->priv; 1575 struct ieee80211_local *local = sdata->local; 1576 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1577 1578 bss_info_changed |= BSS_CHANGED_ASSOC; 1579 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1580 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1581 1582 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1583 beacon_loss_count * bss_conf->beacon_int)); 1584 1585 sdata->u.mgd.associated = cbss; 1586 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1587 1588 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1589 1590 if (sdata->vif.p2p) { 1591 const struct cfg80211_bss_ies *ies; 1592 1593 rcu_read_lock(); 1594 ies = rcu_dereference(cbss->ies); 1595 if (ies) { 1596 int ret; 1597 1598 ret = cfg80211_get_p2p_attr( 1599 ies->data, ies->len, 1600 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1601 (u8 *) &bss_conf->p2p_noa_attr, 1602 sizeof(bss_conf->p2p_noa_attr)); 1603 if (ret >= 2) { 1604 sdata->u.mgd.p2p_noa_index = 1605 bss_conf->p2p_noa_attr.index; 1606 bss_info_changed |= BSS_CHANGED_P2P_PS; 1607 } 1608 } 1609 rcu_read_unlock(); 1610 } 1611 1612 /* just to be sure */ 1613 ieee80211_stop_poll(sdata); 1614 1615 ieee80211_led_assoc(local, 1); 1616 1617 if (sdata->u.mgd.have_beacon) { 1618 /* 1619 * If the AP is buggy we may get here with no DTIM period 1620 * known, so assume it's 1 which is the only safe assumption 1621 * in that case, although if the TIM IE is broken powersave 1622 * probably just won't work at all. 1623 */ 1624 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1625 bss_conf->beacon_rate = bss->beacon_rate; 1626 bss_info_changed |= BSS_CHANGED_BEACON_INFO; 1627 } else { 1628 bss_conf->beacon_rate = NULL; 1629 bss_conf->dtim_period = 0; 1630 } 1631 1632 bss_conf->assoc = 1; 1633 1634 /* Tell the driver to monitor connection quality (if supported) */ 1635 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1636 bss_conf->cqm_rssi_thold) 1637 bss_info_changed |= BSS_CHANGED_CQM; 1638 1639 /* Enable ARP filtering */ 1640 if (bss_conf->arp_addr_cnt) 1641 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1642 1643 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1644 1645 mutex_lock(&local->iflist_mtx); 1646 ieee80211_recalc_ps(local, -1); 1647 mutex_unlock(&local->iflist_mtx); 1648 1649 ieee80211_recalc_smps(sdata); 1650 ieee80211_recalc_ps_vif(sdata); 1651 1652 netif_carrier_on(sdata->dev); 1653 } 1654 1655 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1656 u16 stype, u16 reason, bool tx, 1657 u8 *frame_buf) 1658 { 1659 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1660 struct ieee80211_local *local = sdata->local; 1661 u32 changed = 0; 1662 1663 sdata_assert_lock(sdata); 1664 1665 if (WARN_ON_ONCE(tx && !frame_buf)) 1666 return; 1667 1668 if (WARN_ON(!ifmgd->associated)) 1669 return; 1670 1671 ieee80211_stop_poll(sdata); 1672 1673 ifmgd->associated = NULL; 1674 netif_carrier_off(sdata->dev); 1675 1676 /* 1677 * if we want to get out of ps before disassoc (why?) we have 1678 * to do it before sending disassoc, as otherwise the null-packet 1679 * won't be valid. 1680 */ 1681 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1682 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1683 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1684 } 1685 local->ps_sdata = NULL; 1686 1687 /* disable per-vif ps */ 1688 ieee80211_recalc_ps_vif(sdata); 1689 1690 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */ 1691 if (tx) 1692 ieee80211_flush_queues(local, sdata); 1693 1694 /* deauthenticate/disassociate now */ 1695 if (tx || frame_buf) 1696 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 1697 reason, tx, frame_buf); 1698 1699 /* flush out frame */ 1700 if (tx) 1701 ieee80211_flush_queues(local, sdata); 1702 1703 /* clear bssid only after building the needed mgmt frames */ 1704 memset(ifmgd->bssid, 0, ETH_ALEN); 1705 1706 /* remove AP and TDLS peers */ 1707 sta_info_flush(sdata); 1708 1709 /* finally reset all BSS / config parameters */ 1710 changed |= ieee80211_reset_erp_info(sdata); 1711 1712 ieee80211_led_assoc(local, 0); 1713 changed |= BSS_CHANGED_ASSOC; 1714 sdata->vif.bss_conf.assoc = false; 1715 1716 ifmgd->p2p_noa_index = -1; 1717 memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, 1718 sizeof(sdata->vif.bss_conf.p2p_noa_attr)); 1719 1720 /* on the next assoc, re-program HT/VHT parameters */ 1721 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 1722 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 1723 memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); 1724 memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); 1725 1726 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1727 1728 del_timer_sync(&local->dynamic_ps_timer); 1729 cancel_work_sync(&local->dynamic_ps_enable_work); 1730 1731 /* Disable ARP filtering */ 1732 if (sdata->vif.bss_conf.arp_addr_cnt) 1733 changed |= BSS_CHANGED_ARP_FILTER; 1734 1735 sdata->vif.bss_conf.qos = false; 1736 changed |= BSS_CHANGED_QOS; 1737 1738 /* The BSSID (not really interesting) and HT changed */ 1739 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1740 ieee80211_bss_info_change_notify(sdata, changed); 1741 1742 /* disassociated - set to defaults now */ 1743 ieee80211_set_wmm_default(sdata, false); 1744 1745 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1746 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1747 del_timer_sync(&sdata->u.mgd.timer); 1748 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1749 1750 sdata->vif.bss_conf.dtim_period = 0; 1751 sdata->vif.bss_conf.beacon_rate = NULL; 1752 1753 ifmgd->have_beacon = false; 1754 1755 ifmgd->flags = 0; 1756 mutex_lock(&local->mtx); 1757 ieee80211_vif_release_channel(sdata); 1758 mutex_unlock(&local->mtx); 1759 1760 sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; 1761 } 1762 1763 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1764 struct ieee80211_hdr *hdr) 1765 { 1766 /* 1767 * We can postpone the mgd.timer whenever receiving unicast frames 1768 * from AP because we know that the connection is working both ways 1769 * at that time. But multicast frames (and hence also beacons) must 1770 * be ignored here, because we need to trigger the timer during 1771 * data idle periods for sending the periodic probe request to the 1772 * AP we're connected to. 1773 */ 1774 if (is_multicast_ether_addr(hdr->addr1)) 1775 return; 1776 1777 ieee80211_sta_reset_conn_monitor(sdata); 1778 } 1779 1780 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1781 { 1782 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1783 struct ieee80211_local *local = sdata->local; 1784 1785 mutex_lock(&local->mtx); 1786 if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)) 1787 goto out; 1788 1789 __ieee80211_stop_poll(sdata); 1790 1791 mutex_lock(&local->iflist_mtx); 1792 ieee80211_recalc_ps(local, -1); 1793 mutex_unlock(&local->iflist_mtx); 1794 1795 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1796 goto out; 1797 1798 /* 1799 * We've received a probe response, but are not sure whether 1800 * we have or will be receiving any beacons or data, so let's 1801 * schedule the timers again, just in case. 1802 */ 1803 ieee80211_sta_reset_beacon_monitor(sdata); 1804 1805 mod_timer(&ifmgd->conn_mon_timer, 1806 round_jiffies_up(jiffies + 1807 IEEE80211_CONNECTION_IDLE_TIME)); 1808 out: 1809 mutex_unlock(&local->mtx); 1810 } 1811 1812 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1813 struct ieee80211_hdr *hdr, bool ack) 1814 { 1815 if (!ieee80211_is_data(hdr->frame_control)) 1816 return; 1817 1818 if (ieee80211_is_nullfunc(hdr->frame_control) && 1819 sdata->u.mgd.probe_send_count > 0) { 1820 if (ack) 1821 ieee80211_sta_reset_conn_monitor(sdata); 1822 else 1823 sdata->u.mgd.nullfunc_failed = true; 1824 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1825 return; 1826 } 1827 1828 if (ack) 1829 ieee80211_sta_reset_conn_monitor(sdata); 1830 } 1831 1832 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1833 { 1834 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1835 const u8 *ssid; 1836 u8 *dst = ifmgd->associated->bssid; 1837 u8 unicast_limit = max(1, max_probe_tries - 3); 1838 1839 /* 1840 * Try sending broadcast probe requests for the last three 1841 * probe requests after the first ones failed since some 1842 * buggy APs only support broadcast probe requests. 1843 */ 1844 if (ifmgd->probe_send_count >= unicast_limit) 1845 dst = NULL; 1846 1847 /* 1848 * When the hardware reports an accurate Tx ACK status, it's 1849 * better to send a nullfunc frame instead of a probe request, 1850 * as it will kick us off the AP quickly if we aren't associated 1851 * anymore. The timeout will be reset if the frame is ACKed by 1852 * the AP. 1853 */ 1854 ifmgd->probe_send_count++; 1855 1856 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1857 ifmgd->nullfunc_failed = false; 1858 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1859 } else { 1860 int ssid_len; 1861 1862 rcu_read_lock(); 1863 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1864 if (WARN_ON_ONCE(ssid == NULL)) 1865 ssid_len = 0; 1866 else 1867 ssid_len = ssid[1]; 1868 1869 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL, 1870 0, (u32) -1, true, 0, 1871 ifmgd->associated->channel, false); 1872 rcu_read_unlock(); 1873 } 1874 1875 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1876 run_again(sdata, ifmgd->probe_timeout); 1877 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1878 ieee80211_flush_queues(sdata->local, sdata); 1879 } 1880 1881 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1882 bool beacon) 1883 { 1884 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1885 bool already = false; 1886 1887 if (!ieee80211_sdata_running(sdata)) 1888 return; 1889 1890 sdata_lock(sdata); 1891 1892 if (!ifmgd->associated) 1893 goto out; 1894 1895 mutex_lock(&sdata->local->mtx); 1896 1897 if (sdata->local->tmp_channel || sdata->local->scanning) { 1898 mutex_unlock(&sdata->local->mtx); 1899 goto out; 1900 } 1901 1902 if (beacon) { 1903 mlme_dbg_ratelimited(sdata, 1904 "detected beacon loss from AP (missed %d beacons) - probing\n", 1905 beacon_loss_count); 1906 1907 ieee80211_cqm_rssi_notify(&sdata->vif, 1908 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, 1909 GFP_KERNEL); 1910 } 1911 1912 /* 1913 * The driver/our work has already reported this event or the 1914 * connection monitoring has kicked in and we have already sent 1915 * a probe request. Or maybe the AP died and the driver keeps 1916 * reporting until we disassociate... 1917 * 1918 * In either case we have to ignore the current call to this 1919 * function (except for setting the correct probe reason bit) 1920 * because otherwise we would reset the timer every time and 1921 * never check whether we received a probe response! 1922 */ 1923 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) 1924 already = true; 1925 1926 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 1927 1928 mutex_unlock(&sdata->local->mtx); 1929 1930 if (already) 1931 goto out; 1932 1933 mutex_lock(&sdata->local->iflist_mtx); 1934 ieee80211_recalc_ps(sdata->local, -1); 1935 mutex_unlock(&sdata->local->iflist_mtx); 1936 1937 ifmgd->probe_send_count = 0; 1938 ieee80211_mgd_probe_ap_send(sdata); 1939 out: 1940 sdata_unlock(sdata); 1941 } 1942 1943 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 1944 struct ieee80211_vif *vif) 1945 { 1946 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1947 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1948 struct cfg80211_bss *cbss; 1949 struct sk_buff *skb; 1950 const u8 *ssid; 1951 int ssid_len; 1952 1953 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 1954 return NULL; 1955 1956 sdata_assert_lock(sdata); 1957 1958 if (ifmgd->associated) 1959 cbss = ifmgd->associated; 1960 else if (ifmgd->auth_data) 1961 cbss = ifmgd->auth_data->bss; 1962 else if (ifmgd->assoc_data) 1963 cbss = ifmgd->assoc_data->bss; 1964 else 1965 return NULL; 1966 1967 rcu_read_lock(); 1968 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 1969 if (WARN_ON_ONCE(ssid == NULL)) 1970 ssid_len = 0; 1971 else 1972 ssid_len = ssid[1]; 1973 1974 skb = ieee80211_build_probe_req(sdata, cbss->bssid, 1975 (u32) -1, cbss->channel, 1976 ssid + 2, ssid_len, 1977 NULL, 0, true); 1978 rcu_read_unlock(); 1979 1980 return skb; 1981 } 1982 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 1983 1984 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 1985 { 1986 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1987 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1988 1989 sdata_lock(sdata); 1990 if (!ifmgd->associated) { 1991 sdata_unlock(sdata); 1992 return; 1993 } 1994 1995 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 1996 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 1997 true, frame_buf); 1998 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 1999 sdata->vif.csa_active = false; 2000 ieee80211_wake_queues_by_reason(&sdata->local->hw, 2001 IEEE80211_MAX_QUEUE_MAP, 2002 IEEE80211_QUEUE_STOP_REASON_CSA); 2003 2004 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 2005 IEEE80211_DEAUTH_FRAME_LEN); 2006 sdata_unlock(sdata); 2007 } 2008 2009 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2010 { 2011 struct ieee80211_sub_if_data *sdata = 2012 container_of(work, struct ieee80211_sub_if_data, 2013 u.mgd.beacon_connection_loss_work); 2014 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2015 struct sta_info *sta; 2016 2017 if (ifmgd->associated) { 2018 rcu_read_lock(); 2019 sta = sta_info_get(sdata, ifmgd->bssid); 2020 if (sta) 2021 sta->beacon_loss_count++; 2022 rcu_read_unlock(); 2023 } 2024 2025 if (ifmgd->connection_loss) { 2026 sdata_info(sdata, "Connection to AP %pM lost\n", 2027 ifmgd->bssid); 2028 __ieee80211_disconnect(sdata); 2029 } else { 2030 ieee80211_mgd_probe_ap(sdata, true); 2031 } 2032 } 2033 2034 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2035 { 2036 struct ieee80211_sub_if_data *sdata = 2037 container_of(work, struct ieee80211_sub_if_data, 2038 u.mgd.csa_connection_drop_work); 2039 2040 __ieee80211_disconnect(sdata); 2041 } 2042 2043 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2044 { 2045 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2046 struct ieee80211_hw *hw = &sdata->local->hw; 2047 2048 trace_api_beacon_loss(sdata); 2049 2050 sdata->u.mgd.connection_loss = false; 2051 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2052 } 2053 EXPORT_SYMBOL(ieee80211_beacon_loss); 2054 2055 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2056 { 2057 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2058 struct ieee80211_hw *hw = &sdata->local->hw; 2059 2060 trace_api_connection_loss(sdata); 2061 2062 sdata->u.mgd.connection_loss = true; 2063 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2064 } 2065 EXPORT_SYMBOL(ieee80211_connection_loss); 2066 2067 2068 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2069 bool assoc) 2070 { 2071 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2072 2073 sdata_assert_lock(sdata); 2074 2075 if (!assoc) { 2076 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2077 2078 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2079 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2080 sdata->u.mgd.flags = 0; 2081 mutex_lock(&sdata->local->mtx); 2082 ieee80211_vif_release_channel(sdata); 2083 mutex_unlock(&sdata->local->mtx); 2084 } 2085 2086 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2087 kfree(auth_data); 2088 sdata->u.mgd.auth_data = NULL; 2089 } 2090 2091 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2092 struct ieee80211_mgmt *mgmt, size_t len) 2093 { 2094 struct ieee80211_local *local = sdata->local; 2095 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2096 u8 *pos; 2097 struct ieee802_11_elems elems; 2098 u32 tx_flags = 0; 2099 2100 pos = mgmt->u.auth.variable; 2101 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2102 if (!elems.challenge) 2103 return; 2104 auth_data->expected_transaction = 4; 2105 drv_mgd_prepare_tx(sdata->local, sdata); 2106 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2107 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2108 IEEE80211_TX_INTFL_MLME_CONN_TX; 2109 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2110 elems.challenge - 2, elems.challenge_len + 2, 2111 auth_data->bss->bssid, auth_data->bss->bssid, 2112 auth_data->key, auth_data->key_len, 2113 auth_data->key_idx, tx_flags); 2114 } 2115 2116 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2117 struct ieee80211_mgmt *mgmt, size_t len) 2118 { 2119 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2120 u8 bssid[ETH_ALEN]; 2121 u16 auth_alg, auth_transaction, status_code; 2122 struct sta_info *sta; 2123 2124 sdata_assert_lock(sdata); 2125 2126 if (len < 24 + 6) 2127 return; 2128 2129 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2130 return; 2131 2132 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2133 2134 if (!ether_addr_equal(bssid, mgmt->bssid)) 2135 return; 2136 2137 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2138 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2139 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2140 2141 if (auth_alg != ifmgd->auth_data->algorithm || 2142 auth_transaction != ifmgd->auth_data->expected_transaction) { 2143 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2144 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2145 auth_transaction, 2146 ifmgd->auth_data->expected_transaction); 2147 return; 2148 } 2149 2150 if (status_code != WLAN_STATUS_SUCCESS) { 2151 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2152 mgmt->sa, status_code); 2153 ieee80211_destroy_auth_data(sdata, false); 2154 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2155 return; 2156 } 2157 2158 switch (ifmgd->auth_data->algorithm) { 2159 case WLAN_AUTH_OPEN: 2160 case WLAN_AUTH_LEAP: 2161 case WLAN_AUTH_FT: 2162 case WLAN_AUTH_SAE: 2163 break; 2164 case WLAN_AUTH_SHARED_KEY: 2165 if (ifmgd->auth_data->expected_transaction != 4) { 2166 ieee80211_auth_challenge(sdata, mgmt, len); 2167 /* need another frame */ 2168 return; 2169 } 2170 break; 2171 default: 2172 WARN_ONCE(1, "invalid auth alg %d", 2173 ifmgd->auth_data->algorithm); 2174 return; 2175 } 2176 2177 sdata_info(sdata, "authenticated\n"); 2178 ifmgd->auth_data->done = true; 2179 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2180 ifmgd->auth_data->timeout_started = true; 2181 run_again(sdata, ifmgd->auth_data->timeout); 2182 2183 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2184 ifmgd->auth_data->expected_transaction != 2) { 2185 /* 2186 * Report auth frame to user space for processing since another 2187 * round of Authentication frames is still needed. 2188 */ 2189 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2190 return; 2191 } 2192 2193 /* move station state to auth */ 2194 mutex_lock(&sdata->local->sta_mtx); 2195 sta = sta_info_get(sdata, bssid); 2196 if (!sta) { 2197 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2198 goto out_err; 2199 } 2200 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2201 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2202 goto out_err; 2203 } 2204 mutex_unlock(&sdata->local->sta_mtx); 2205 2206 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2207 return; 2208 out_err: 2209 mutex_unlock(&sdata->local->sta_mtx); 2210 /* ignore frame -- wait for timeout */ 2211 } 2212 2213 2214 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2215 struct ieee80211_mgmt *mgmt, size_t len) 2216 { 2217 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2218 const u8 *bssid = NULL; 2219 u16 reason_code; 2220 2221 sdata_assert_lock(sdata); 2222 2223 if (len < 24 + 2) 2224 return; 2225 2226 if (!ifmgd->associated || 2227 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2228 return; 2229 2230 bssid = ifmgd->associated->bssid; 2231 2232 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2233 2234 sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n", 2235 bssid, reason_code); 2236 2237 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2238 2239 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2240 } 2241 2242 2243 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2244 struct ieee80211_mgmt *mgmt, size_t len) 2245 { 2246 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2247 u16 reason_code; 2248 2249 sdata_assert_lock(sdata); 2250 2251 if (len < 24 + 2) 2252 return; 2253 2254 if (!ifmgd->associated || 2255 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2256 return; 2257 2258 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2259 2260 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2261 mgmt->sa, reason_code); 2262 2263 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2264 2265 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len); 2266 } 2267 2268 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2269 u8 *supp_rates, unsigned int supp_rates_len, 2270 u32 *rates, u32 *basic_rates, 2271 bool *have_higher_than_11mbit, 2272 int *min_rate, int *min_rate_index, 2273 int shift, u32 rate_flags) 2274 { 2275 int i, j; 2276 2277 for (i = 0; i < supp_rates_len; i++) { 2278 int rate = supp_rates[i] & 0x7f; 2279 bool is_basic = !!(supp_rates[i] & 0x80); 2280 2281 if ((rate * 5 * (1 << shift)) > 110) 2282 *have_higher_than_11mbit = true; 2283 2284 /* 2285 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2286 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2287 * 2288 * Note: Even through the membership selector and the basic 2289 * rate flag share the same bit, they are not exactly 2290 * the same. 2291 */ 2292 if (!!(supp_rates[i] & 0x80) && 2293 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2294 continue; 2295 2296 for (j = 0; j < sband->n_bitrates; j++) { 2297 struct ieee80211_rate *br; 2298 int brate; 2299 2300 br = &sband->bitrates[j]; 2301 if ((rate_flags & br->flags) != rate_flags) 2302 continue; 2303 2304 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2305 if (brate == rate) { 2306 *rates |= BIT(j); 2307 if (is_basic) 2308 *basic_rates |= BIT(j); 2309 if ((rate * 5) < *min_rate) { 2310 *min_rate = rate * 5; 2311 *min_rate_index = j; 2312 } 2313 break; 2314 } 2315 } 2316 } 2317 } 2318 2319 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2320 bool assoc) 2321 { 2322 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2323 2324 sdata_assert_lock(sdata); 2325 2326 if (!assoc) { 2327 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2328 2329 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2330 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2331 sdata->u.mgd.flags = 0; 2332 mutex_lock(&sdata->local->mtx); 2333 ieee80211_vif_release_channel(sdata); 2334 mutex_unlock(&sdata->local->mtx); 2335 } 2336 2337 kfree(assoc_data); 2338 sdata->u.mgd.assoc_data = NULL; 2339 } 2340 2341 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2342 struct cfg80211_bss *cbss, 2343 struct ieee80211_mgmt *mgmt, size_t len) 2344 { 2345 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2346 struct ieee80211_local *local = sdata->local; 2347 struct ieee80211_supported_band *sband; 2348 struct sta_info *sta; 2349 u8 *pos; 2350 u16 capab_info, aid; 2351 struct ieee802_11_elems elems; 2352 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2353 const struct cfg80211_bss_ies *bss_ies = NULL; 2354 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2355 u32 changed = 0; 2356 int err; 2357 bool ret; 2358 2359 /* AssocResp and ReassocResp have identical structure */ 2360 2361 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2362 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2363 2364 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2365 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2366 aid); 2367 aid &= ~(BIT(15) | BIT(14)); 2368 2369 ifmgd->broken_ap = false; 2370 2371 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2372 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2373 aid); 2374 aid = 0; 2375 ifmgd->broken_ap = true; 2376 } 2377 2378 pos = mgmt->u.assoc_resp.variable; 2379 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2380 2381 if (!elems.supp_rates) { 2382 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2383 return false; 2384 } 2385 2386 ifmgd->aid = aid; 2387 2388 /* 2389 * Some APs are erroneously not including some information in their 2390 * (re)association response frames. Try to recover by using the data 2391 * from the beacon or probe response. This seems to afflict mobile 2392 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T", 2393 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device. 2394 */ 2395 if ((assoc_data->wmm && !elems.wmm_param) || 2396 (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2397 (!elems.ht_cap_elem || !elems.ht_operation)) || 2398 (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2399 (!elems.vht_cap_elem || !elems.vht_operation))) { 2400 const struct cfg80211_bss_ies *ies; 2401 struct ieee802_11_elems bss_elems; 2402 2403 rcu_read_lock(); 2404 ies = rcu_dereference(cbss->ies); 2405 if (ies) 2406 bss_ies = kmemdup(ies, sizeof(*ies) + ies->len, 2407 GFP_ATOMIC); 2408 rcu_read_unlock(); 2409 if (!bss_ies) 2410 return false; 2411 2412 ieee802_11_parse_elems(bss_ies->data, bss_ies->len, 2413 false, &bss_elems); 2414 if (assoc_data->wmm && 2415 !elems.wmm_param && bss_elems.wmm_param) { 2416 elems.wmm_param = bss_elems.wmm_param; 2417 sdata_info(sdata, 2418 "AP bug: WMM param missing from AssocResp\n"); 2419 } 2420 2421 /* 2422 * Also check if we requested HT/VHT, otherwise the AP doesn't 2423 * have to include the IEs in the (re)association response. 2424 */ 2425 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem && 2426 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2427 elems.ht_cap_elem = bss_elems.ht_cap_elem; 2428 sdata_info(sdata, 2429 "AP bug: HT capability missing from AssocResp\n"); 2430 } 2431 if (!elems.ht_operation && bss_elems.ht_operation && 2432 !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { 2433 elems.ht_operation = bss_elems.ht_operation; 2434 sdata_info(sdata, 2435 "AP bug: HT operation missing from AssocResp\n"); 2436 } 2437 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem && 2438 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2439 elems.vht_cap_elem = bss_elems.vht_cap_elem; 2440 sdata_info(sdata, 2441 "AP bug: VHT capa missing from AssocResp\n"); 2442 } 2443 if (!elems.vht_operation && bss_elems.vht_operation && 2444 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) { 2445 elems.vht_operation = bss_elems.vht_operation; 2446 sdata_info(sdata, 2447 "AP bug: VHT operation missing from AssocResp\n"); 2448 } 2449 } 2450 2451 /* 2452 * We previously checked these in the beacon/probe response, so 2453 * they should be present here. This is just a safety net. 2454 */ 2455 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2456 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2457 sdata_info(sdata, 2458 "HT AP is missing WMM params or HT capability/operation\n"); 2459 ret = false; 2460 goto out; 2461 } 2462 2463 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2464 (!elems.vht_cap_elem || !elems.vht_operation)) { 2465 sdata_info(sdata, 2466 "VHT AP is missing VHT capability/operation\n"); 2467 ret = false; 2468 goto out; 2469 } 2470 2471 mutex_lock(&sdata->local->sta_mtx); 2472 /* 2473 * station info was already allocated and inserted before 2474 * the association and should be available to us 2475 */ 2476 sta = sta_info_get(sdata, cbss->bssid); 2477 if (WARN_ON(!sta)) { 2478 mutex_unlock(&sdata->local->sta_mtx); 2479 ret = false; 2480 goto out; 2481 } 2482 2483 sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)]; 2484 2485 /* Set up internal HT/VHT capabilities */ 2486 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 2487 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 2488 elems.ht_cap_elem, sta); 2489 2490 if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 2491 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 2492 elems.vht_cap_elem, sta); 2493 2494 /* 2495 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data 2496 * in their association response, so ignore that data for our own 2497 * configuration. If it changed since the last beacon, we'll get the 2498 * next beacon and update then. 2499 */ 2500 2501 /* 2502 * If an operating mode notification IE is present, override the 2503 * NSS calculation (that would be done in rate_control_rate_init()) 2504 * and use the # of streams from that element. 2505 */ 2506 if (elems.opmode_notif && 2507 !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) { 2508 u8 nss; 2509 2510 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; 2511 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; 2512 nss += 1; 2513 sta->sta.rx_nss = nss; 2514 } 2515 2516 rate_control_rate_init(sta); 2517 2518 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) 2519 set_sta_flag(sta, WLAN_STA_MFP); 2520 2521 if (elems.wmm_param) 2522 set_sta_flag(sta, WLAN_STA_WME); 2523 2524 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); 2525 if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) 2526 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); 2527 if (err) { 2528 sdata_info(sdata, 2529 "failed to move station %pM to desired state\n", 2530 sta->sta.addr); 2531 WARN_ON(__sta_info_destroy(sta)); 2532 mutex_unlock(&sdata->local->sta_mtx); 2533 ret = false; 2534 goto out; 2535 } 2536 2537 mutex_unlock(&sdata->local->sta_mtx); 2538 2539 /* 2540 * Always handle WMM once after association regardless 2541 * of the first value the AP uses. Setting -1 here has 2542 * that effect because the AP values is an unsigned 2543 * 4-bit value. 2544 */ 2545 ifmgd->wmm_last_param_set = -1; 2546 2547 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param) 2548 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2549 elems.wmm_param_len); 2550 else 2551 ieee80211_set_wmm_default(sdata, false); 2552 changed |= BSS_CHANGED_QOS; 2553 2554 /* set AID and assoc capability, 2555 * ieee80211_set_associated() will tell the driver */ 2556 bss_conf->aid = aid; 2557 bss_conf->assoc_capability = capab_info; 2558 ieee80211_set_associated(sdata, cbss, changed); 2559 2560 /* 2561 * If we're using 4-addr mode, let the AP know that we're 2562 * doing so, so that it can create the STA VLAN on its side 2563 */ 2564 if (ifmgd->use_4addr) 2565 ieee80211_send_4addr_nullfunc(local, sdata); 2566 2567 /* 2568 * Start timer to probe the connection to the AP now. 2569 * Also start the timer that will detect beacon loss. 2570 */ 2571 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 2572 ieee80211_sta_reset_beacon_monitor(sdata); 2573 2574 ret = true; 2575 out: 2576 kfree(bss_ies); 2577 return ret; 2578 } 2579 2580 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 2581 struct ieee80211_mgmt *mgmt, 2582 size_t len) 2583 { 2584 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2585 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2586 u16 capab_info, status_code, aid; 2587 struct ieee802_11_elems elems; 2588 u8 *pos; 2589 bool reassoc; 2590 struct cfg80211_bss *bss; 2591 2592 sdata_assert_lock(sdata); 2593 2594 if (!assoc_data) 2595 return; 2596 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 2597 return; 2598 2599 /* 2600 * AssocResp and ReassocResp have identical structure, so process both 2601 * of them in this function. 2602 */ 2603 2604 if (len < 24 + 6) 2605 return; 2606 2607 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 2608 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2609 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2610 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2611 2612 sdata_info(sdata, 2613 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 2614 reassoc ? "Rea" : "A", mgmt->sa, 2615 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 2616 2617 pos = mgmt->u.assoc_resp.variable; 2618 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); 2619 2620 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 2621 elems.timeout_int && 2622 elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) { 2623 u32 tu, ms; 2624 tu = le32_to_cpu(elems.timeout_int->value); 2625 ms = tu * 1024 / 1000; 2626 sdata_info(sdata, 2627 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 2628 mgmt->sa, tu, ms); 2629 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 2630 assoc_data->timeout_started = true; 2631 if (ms > IEEE80211_ASSOC_TIMEOUT) 2632 run_again(sdata, assoc_data->timeout); 2633 return; 2634 } 2635 2636 bss = assoc_data->bss; 2637 2638 if (status_code != WLAN_STATUS_SUCCESS) { 2639 sdata_info(sdata, "%pM denied association (code=%d)\n", 2640 mgmt->sa, status_code); 2641 ieee80211_destroy_assoc_data(sdata, false); 2642 } else { 2643 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) { 2644 /* oops -- internal error -- send timeout for now */ 2645 ieee80211_destroy_assoc_data(sdata, false); 2646 cfg80211_assoc_timeout(sdata->dev, bss); 2647 return; 2648 } 2649 sdata_info(sdata, "associated\n"); 2650 2651 /* 2652 * destroy assoc_data afterwards, as otherwise an idle 2653 * recalc after assoc_data is NULL but before associated 2654 * is set can cause the interface to go idle 2655 */ 2656 ieee80211_destroy_assoc_data(sdata, true); 2657 } 2658 2659 cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len); 2660 } 2661 2662 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 2663 struct ieee80211_mgmt *mgmt, size_t len, 2664 struct ieee80211_rx_status *rx_status, 2665 struct ieee802_11_elems *elems) 2666 { 2667 struct ieee80211_local *local = sdata->local; 2668 int freq; 2669 struct ieee80211_bss *bss; 2670 struct ieee80211_channel *channel; 2671 2672 sdata_assert_lock(sdata); 2673 2674 if (elems->ds_params) 2675 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 2676 rx_status->band); 2677 else 2678 freq = rx_status->freq; 2679 2680 channel = ieee80211_get_channel(local->hw.wiphy, freq); 2681 2682 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 2683 return; 2684 2685 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 2686 channel); 2687 if (bss) { 2688 ieee80211_rx_bss_put(local, bss); 2689 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate; 2690 } 2691 } 2692 2693 2694 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 2695 struct sk_buff *skb) 2696 { 2697 struct ieee80211_mgmt *mgmt = (void *)skb->data; 2698 struct ieee80211_if_managed *ifmgd; 2699 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 2700 size_t baselen, len = skb->len; 2701 struct ieee802_11_elems elems; 2702 2703 ifmgd = &sdata->u.mgd; 2704 2705 sdata_assert_lock(sdata); 2706 2707 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 2708 return; /* ignore ProbeResp to foreign address */ 2709 2710 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 2711 if (baselen > len) 2712 return; 2713 2714 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 2715 false, &elems); 2716 2717 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2718 2719 if (ifmgd->associated && 2720 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2721 ieee80211_reset_ap_probe(sdata); 2722 2723 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && 2724 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { 2725 /* got probe response, continue with auth */ 2726 sdata_info(sdata, "direct probe responded\n"); 2727 ifmgd->auth_data->tries = 0; 2728 ifmgd->auth_data->timeout = jiffies; 2729 ifmgd->auth_data->timeout_started = true; 2730 run_again(sdata, ifmgd->auth_data->timeout); 2731 } 2732 } 2733 2734 /* 2735 * This is the canonical list of information elements we care about, 2736 * the filter code also gives us all changes to the Microsoft OUI 2737 * (00:50:F2) vendor IE which is used for WMM which we need to track. 2738 * 2739 * We implement beacon filtering in software since that means we can 2740 * avoid processing the frame here and in cfg80211, and userspace 2741 * will not be able to tell whether the hardware supports it or not. 2742 * 2743 * XXX: This list needs to be dynamic -- userspace needs to be able to 2744 * add items it requires. It also needs to be able to tell us to 2745 * look out for other vendor IEs. 2746 */ 2747 static const u64 care_about_ies = 2748 (1ULL << WLAN_EID_COUNTRY) | 2749 (1ULL << WLAN_EID_ERP_INFO) | 2750 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 2751 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 2752 (1ULL << WLAN_EID_HT_CAPABILITY) | 2753 (1ULL << WLAN_EID_HT_OPERATION); 2754 2755 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 2756 struct ieee80211_mgmt *mgmt, size_t len, 2757 struct ieee80211_rx_status *rx_status) 2758 { 2759 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2760 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2761 size_t baselen; 2762 struct ieee802_11_elems elems; 2763 struct ieee80211_local *local = sdata->local; 2764 struct ieee80211_chanctx_conf *chanctx_conf; 2765 struct ieee80211_channel *chan; 2766 struct sta_info *sta; 2767 u32 changed = 0; 2768 bool erp_valid; 2769 u8 erp_value = 0; 2770 u32 ncrc; 2771 u8 *bssid; 2772 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2773 2774 sdata_assert_lock(sdata); 2775 2776 /* Process beacon from the current BSS */ 2777 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 2778 if (baselen > len) 2779 return; 2780 2781 rcu_read_lock(); 2782 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2783 if (!chanctx_conf) { 2784 rcu_read_unlock(); 2785 return; 2786 } 2787 2788 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 2789 rcu_read_unlock(); 2790 return; 2791 } 2792 chan = chanctx_conf->def.chan; 2793 rcu_read_unlock(); 2794 2795 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 2796 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2797 ieee802_11_parse_elems(mgmt->u.beacon.variable, 2798 len - baselen, false, &elems); 2799 2800 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2801 if (elems.tim && !elems.parse_error) { 2802 const struct ieee80211_tim_ie *tim_ie = elems.tim; 2803 ifmgd->dtim_period = tim_ie->dtim_period; 2804 } 2805 ifmgd->have_beacon = true; 2806 ifmgd->assoc_data->need_beacon = false; 2807 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 2808 sdata->vif.bss_conf.sync_tsf = 2809 le64_to_cpu(mgmt->u.beacon.timestamp); 2810 sdata->vif.bss_conf.sync_device_ts = 2811 rx_status->device_timestamp; 2812 if (elems.tim) 2813 sdata->vif.bss_conf.sync_dtim_count = 2814 elems.tim->dtim_count; 2815 else 2816 sdata->vif.bss_conf.sync_dtim_count = 0; 2817 } 2818 /* continue assoc process */ 2819 ifmgd->assoc_data->timeout = jiffies; 2820 ifmgd->assoc_data->timeout_started = true; 2821 run_again(sdata, ifmgd->assoc_data->timeout); 2822 return; 2823 } 2824 2825 if (!ifmgd->associated || 2826 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2827 return; 2828 bssid = ifmgd->associated->bssid; 2829 2830 /* Track average RSSI from the Beacon frames of the current AP */ 2831 ifmgd->last_beacon_signal = rx_status->signal; 2832 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 2833 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 2834 ifmgd->ave_beacon_signal = rx_status->signal * 16; 2835 ifmgd->last_cqm_event_signal = 0; 2836 ifmgd->count_beacon_signal = 1; 2837 ifmgd->last_ave_beacon_signal = 0; 2838 } else { 2839 ifmgd->ave_beacon_signal = 2840 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 2841 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 2842 ifmgd->ave_beacon_signal) / 16; 2843 ifmgd->count_beacon_signal++; 2844 } 2845 2846 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 2847 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 2848 int sig = ifmgd->ave_beacon_signal; 2849 int last_sig = ifmgd->last_ave_beacon_signal; 2850 2851 /* 2852 * if signal crosses either of the boundaries, invoke callback 2853 * with appropriate parameters 2854 */ 2855 if (sig > ifmgd->rssi_max_thold && 2856 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 2857 ifmgd->last_ave_beacon_signal = sig; 2858 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH); 2859 } else if (sig < ifmgd->rssi_min_thold && 2860 (last_sig >= ifmgd->rssi_max_thold || 2861 last_sig == 0)) { 2862 ifmgd->last_ave_beacon_signal = sig; 2863 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW); 2864 } 2865 } 2866 2867 if (bss_conf->cqm_rssi_thold && 2868 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 2869 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 2870 int sig = ifmgd->ave_beacon_signal / 16; 2871 int last_event = ifmgd->last_cqm_event_signal; 2872 int thold = bss_conf->cqm_rssi_thold; 2873 int hyst = bss_conf->cqm_rssi_hyst; 2874 if (sig < thold && 2875 (last_event == 0 || sig < last_event - hyst)) { 2876 ifmgd->last_cqm_event_signal = sig; 2877 ieee80211_cqm_rssi_notify( 2878 &sdata->vif, 2879 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 2880 GFP_KERNEL); 2881 } else if (sig > thold && 2882 (last_event == 0 || sig > last_event + hyst)) { 2883 ifmgd->last_cqm_event_signal = sig; 2884 ieee80211_cqm_rssi_notify( 2885 &sdata->vif, 2886 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 2887 GFP_KERNEL); 2888 } 2889 } 2890 2891 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) { 2892 mlme_dbg_ratelimited(sdata, 2893 "cancelling AP probe due to a received beacon\n"); 2894 ieee80211_reset_ap_probe(sdata); 2895 } 2896 2897 /* 2898 * Push the beacon loss detection into the future since 2899 * we are processing a beacon from the AP just now. 2900 */ 2901 ieee80211_sta_reset_beacon_monitor(sdata); 2902 2903 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 2904 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 2905 len - baselen, false, &elems, 2906 care_about_ies, ncrc); 2907 2908 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 2909 bool directed_tim = ieee80211_check_tim(elems.tim, 2910 elems.tim_len, 2911 ifmgd->aid); 2912 if (directed_tim) { 2913 if (local->hw.conf.dynamic_ps_timeout > 0) { 2914 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2915 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2916 ieee80211_hw_config(local, 2917 IEEE80211_CONF_CHANGE_PS); 2918 } 2919 ieee80211_send_nullfunc(local, sdata, 0); 2920 } else if (!local->pspolling && sdata->u.mgd.powersave) { 2921 local->pspolling = true; 2922 2923 /* 2924 * Here is assumed that the driver will be 2925 * able to send ps-poll frame and receive a 2926 * response even though power save mode is 2927 * enabled, but some drivers might require 2928 * to disable power save here. This needs 2929 * to be investigated. 2930 */ 2931 ieee80211_send_pspoll(local, sdata); 2932 } 2933 } 2934 } 2935 2936 if (sdata->vif.p2p) { 2937 struct ieee80211_p2p_noa_attr noa = {}; 2938 int ret; 2939 2940 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 2941 len - baselen, 2942 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 2943 (u8 *) &noa, sizeof(noa)); 2944 if (ret >= 2) { 2945 if (sdata->u.mgd.p2p_noa_index != noa.index) { 2946 /* valid noa_attr and index changed */ 2947 sdata->u.mgd.p2p_noa_index = noa.index; 2948 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa)); 2949 changed |= BSS_CHANGED_P2P_PS; 2950 /* 2951 * make sure we update all information, the CRC 2952 * mechanism doesn't look at P2P attributes. 2953 */ 2954 ifmgd->beacon_crc_valid = false; 2955 } 2956 } else if (sdata->u.mgd.p2p_noa_index != -1) { 2957 /* noa_attr not found and we had valid noa_attr before */ 2958 sdata->u.mgd.p2p_noa_index = -1; 2959 memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr)); 2960 changed |= BSS_CHANGED_P2P_PS; 2961 ifmgd->beacon_crc_valid = false; 2962 } 2963 } 2964 2965 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 2966 return; 2967 ifmgd->beacon_crc = ncrc; 2968 ifmgd->beacon_crc_valid = true; 2969 2970 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2971 2972 ieee80211_sta_process_chanswitch(sdata, rx_status->mactime, 2973 &elems, true); 2974 2975 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && 2976 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2977 elems.wmm_param_len)) 2978 changed |= BSS_CHANGED_QOS; 2979 2980 /* 2981 * If we haven't had a beacon before, tell the driver about the 2982 * DTIM period (and beacon timing if desired) now. 2983 */ 2984 if (!ifmgd->have_beacon) { 2985 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 2986 if (elems.tim) 2987 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 2988 else 2989 bss_conf->dtim_period = 1; 2990 2991 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 2992 sdata->vif.bss_conf.sync_tsf = 2993 le64_to_cpu(mgmt->u.beacon.timestamp); 2994 sdata->vif.bss_conf.sync_device_ts = 2995 rx_status->device_timestamp; 2996 if (elems.tim) 2997 sdata->vif.bss_conf.sync_dtim_count = 2998 elems.tim->dtim_count; 2999 else 3000 sdata->vif.bss_conf.sync_dtim_count = 0; 3001 } 3002 3003 changed |= BSS_CHANGED_BEACON_INFO; 3004 ifmgd->have_beacon = true; 3005 3006 mutex_lock(&local->iflist_mtx); 3007 ieee80211_recalc_ps(local, -1); 3008 mutex_unlock(&local->iflist_mtx); 3009 3010 ieee80211_recalc_ps_vif(sdata); 3011 } 3012 3013 if (elems.erp_info) { 3014 erp_valid = true; 3015 erp_value = elems.erp_info[0]; 3016 } else { 3017 erp_valid = false; 3018 } 3019 changed |= ieee80211_handle_bss_capability(sdata, 3020 le16_to_cpu(mgmt->u.beacon.capab_info), 3021 erp_valid, erp_value); 3022 3023 mutex_lock(&local->sta_mtx); 3024 sta = sta_info_get(sdata, bssid); 3025 3026 if (ieee80211_config_bw(sdata, sta, elems.ht_operation, 3027 elems.vht_operation, bssid, &changed)) { 3028 mutex_unlock(&local->sta_mtx); 3029 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3030 WLAN_REASON_DEAUTH_LEAVING, 3031 true, deauth_buf); 3032 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf, 3033 sizeof(deauth_buf)); 3034 return; 3035 } 3036 3037 if (sta && elems.opmode_notif) 3038 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3039 rx_status->band, true); 3040 mutex_unlock(&local->sta_mtx); 3041 3042 if (elems.country_elem && elems.pwr_constr_elem && 3043 mgmt->u.probe_resp.capab_info & 3044 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) 3045 changed |= ieee80211_handle_pwr_constr(sdata, chan, 3046 elems.country_elem, 3047 elems.country_elem_len, 3048 elems.pwr_constr_elem); 3049 3050 ieee80211_bss_info_change_notify(sdata, changed); 3051 } 3052 3053 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3054 struct sk_buff *skb) 3055 { 3056 struct ieee80211_rx_status *rx_status; 3057 struct ieee80211_mgmt *mgmt; 3058 u16 fc; 3059 struct ieee802_11_elems elems; 3060 int ies_len; 3061 3062 rx_status = (struct ieee80211_rx_status *) skb->cb; 3063 mgmt = (struct ieee80211_mgmt *) skb->data; 3064 fc = le16_to_cpu(mgmt->frame_control); 3065 3066 sdata_lock(sdata); 3067 3068 switch (fc & IEEE80211_FCTL_STYPE) { 3069 case IEEE80211_STYPE_BEACON: 3070 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 3071 break; 3072 case IEEE80211_STYPE_PROBE_RESP: 3073 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3074 break; 3075 case IEEE80211_STYPE_AUTH: 3076 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3077 break; 3078 case IEEE80211_STYPE_DEAUTH: 3079 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3080 break; 3081 case IEEE80211_STYPE_DISASSOC: 3082 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3083 break; 3084 case IEEE80211_STYPE_ASSOC_RESP: 3085 case IEEE80211_STYPE_REASSOC_RESP: 3086 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len); 3087 break; 3088 case IEEE80211_STYPE_ACTION: 3089 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) { 3090 ies_len = skb->len - 3091 offsetof(struct ieee80211_mgmt, 3092 u.action.u.chan_switch.variable); 3093 3094 if (ies_len < 0) 3095 break; 3096 3097 ieee802_11_parse_elems( 3098 mgmt->u.action.u.chan_switch.variable, 3099 ies_len, true, &elems); 3100 3101 if (elems.parse_error) 3102 break; 3103 3104 ieee80211_sta_process_chanswitch(sdata, 3105 rx_status->mactime, 3106 &elems, false); 3107 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 3108 ies_len = skb->len - 3109 offsetof(struct ieee80211_mgmt, 3110 u.action.u.ext_chan_switch.variable); 3111 3112 if (ies_len < 0) 3113 break; 3114 3115 ieee802_11_parse_elems( 3116 mgmt->u.action.u.ext_chan_switch.variable, 3117 ies_len, true, &elems); 3118 3119 if (elems.parse_error) 3120 break; 3121 3122 /* for the handling code pretend this was also an IE */ 3123 elems.ext_chansw_ie = 3124 &mgmt->u.action.u.ext_chan_switch.data; 3125 3126 ieee80211_sta_process_chanswitch(sdata, 3127 rx_status->mactime, 3128 &elems, false); 3129 } 3130 break; 3131 } 3132 sdata_unlock(sdata); 3133 } 3134 3135 static void ieee80211_sta_timer(unsigned long data) 3136 { 3137 struct ieee80211_sub_if_data *sdata = 3138 (struct ieee80211_sub_if_data *) data; 3139 3140 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3141 } 3142 3143 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3144 u8 *bssid, u8 reason, bool tx) 3145 { 3146 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3147 3148 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3149 tx, frame_buf); 3150 3151 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 3152 IEEE80211_DEAUTH_FRAME_LEN); 3153 } 3154 3155 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) 3156 { 3157 struct ieee80211_local *local = sdata->local; 3158 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3159 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3160 u32 tx_flags = 0; 3161 3162 sdata_assert_lock(sdata); 3163 3164 if (WARN_ON_ONCE(!auth_data)) 3165 return -EINVAL; 3166 3167 auth_data->tries++; 3168 3169 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3170 sdata_info(sdata, "authentication with %pM timed out\n", 3171 auth_data->bss->bssid); 3172 3173 /* 3174 * Most likely AP is not in the range so remove the 3175 * bss struct for that AP. 3176 */ 3177 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3178 3179 return -ETIMEDOUT; 3180 } 3181 3182 drv_mgd_prepare_tx(local, sdata); 3183 3184 if (auth_data->bss->proberesp_ies) { 3185 u16 trans = 1; 3186 u16 status = 0; 3187 3188 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3189 auth_data->bss->bssid, auth_data->tries, 3190 IEEE80211_AUTH_MAX_TRIES); 3191 3192 auth_data->expected_transaction = 2; 3193 3194 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3195 trans = auth_data->sae_trans; 3196 status = auth_data->sae_status; 3197 auth_data->expected_transaction = trans; 3198 } 3199 3200 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3201 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3202 IEEE80211_TX_INTFL_MLME_CONN_TX; 3203 3204 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3205 auth_data->data, auth_data->data_len, 3206 auth_data->bss->bssid, 3207 auth_data->bss->bssid, NULL, 0, 0, 3208 tx_flags); 3209 } else { 3210 const u8 *ssidie; 3211 3212 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n", 3213 auth_data->bss->bssid, auth_data->tries, 3214 IEEE80211_AUTH_MAX_TRIES); 3215 3216 rcu_read_lock(); 3217 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); 3218 if (!ssidie) { 3219 rcu_read_unlock(); 3220 return -EINVAL; 3221 } 3222 /* 3223 * Direct probe is sent to broadcast address as some APs 3224 * will not answer to direct packet in unassociated state. 3225 */ 3226 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1], 3227 NULL, 0, (u32) -1, true, 0, 3228 auth_data->bss->channel, false); 3229 rcu_read_unlock(); 3230 } 3231 3232 if (tx_flags == 0) { 3233 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3234 auth_data->timeout_started = true; 3235 run_again(sdata, auth_data->timeout); 3236 } else { 3237 auth_data->timeout = 3238 round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG); 3239 auth_data->timeout_started = true; 3240 run_again(sdata, auth_data->timeout); 3241 } 3242 3243 return 0; 3244 } 3245 3246 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3247 { 3248 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3249 struct ieee80211_local *local = sdata->local; 3250 3251 sdata_assert_lock(sdata); 3252 3253 assoc_data->tries++; 3254 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3255 sdata_info(sdata, "association with %pM timed out\n", 3256 assoc_data->bss->bssid); 3257 3258 /* 3259 * Most likely AP is not in the range so remove the 3260 * bss struct for that AP. 3261 */ 3262 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3263 3264 return -ETIMEDOUT; 3265 } 3266 3267 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3268 assoc_data->bss->bssid, assoc_data->tries, 3269 IEEE80211_ASSOC_MAX_TRIES); 3270 ieee80211_send_assoc(sdata); 3271 3272 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) { 3273 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3274 assoc_data->timeout_started = true; 3275 run_again(sdata, assoc_data->timeout); 3276 } else { 3277 assoc_data->timeout = 3278 round_jiffies_up(jiffies + 3279 IEEE80211_ASSOC_TIMEOUT_LONG); 3280 assoc_data->timeout_started = true; 3281 run_again(sdata, assoc_data->timeout); 3282 } 3283 3284 return 0; 3285 } 3286 3287 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3288 __le16 fc, bool acked) 3289 { 3290 struct ieee80211_local *local = sdata->local; 3291 3292 sdata->u.mgd.status_fc = fc; 3293 sdata->u.mgd.status_acked = acked; 3294 sdata->u.mgd.status_received = true; 3295 3296 ieee80211_queue_work(&local->hw, &sdata->work); 3297 } 3298 3299 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3300 { 3301 struct ieee80211_local *local = sdata->local; 3302 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3303 3304 sdata_lock(sdata); 3305 3306 if (ifmgd->status_received) { 3307 __le16 fc = ifmgd->status_fc; 3308 bool status_acked = ifmgd->status_acked; 3309 3310 ifmgd->status_received = false; 3311 if (ifmgd->auth_data && 3312 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) { 3313 if (status_acked) { 3314 ifmgd->auth_data->timeout = 3315 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3316 run_again(sdata, ifmgd->auth_data->timeout); 3317 } else { 3318 ifmgd->auth_data->timeout = jiffies - 1; 3319 } 3320 ifmgd->auth_data->timeout_started = true; 3321 } else if (ifmgd->assoc_data && 3322 (ieee80211_is_assoc_req(fc) || 3323 ieee80211_is_reassoc_req(fc))) { 3324 if (status_acked) { 3325 ifmgd->assoc_data->timeout = 3326 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3327 run_again(sdata, ifmgd->assoc_data->timeout); 3328 } else { 3329 ifmgd->assoc_data->timeout = jiffies - 1; 3330 } 3331 ifmgd->assoc_data->timeout_started = true; 3332 } 3333 } 3334 3335 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3336 time_after(jiffies, ifmgd->auth_data->timeout)) { 3337 if (ifmgd->auth_data->done) { 3338 /* 3339 * ok ... we waited for assoc but userspace didn't, 3340 * so let's just kill the auth data 3341 */ 3342 ieee80211_destroy_auth_data(sdata, false); 3343 } else if (ieee80211_probe_auth(sdata)) { 3344 u8 bssid[ETH_ALEN]; 3345 3346 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3347 3348 ieee80211_destroy_auth_data(sdata, false); 3349 3350 cfg80211_auth_timeout(sdata->dev, bssid); 3351 } 3352 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3353 run_again(sdata, ifmgd->auth_data->timeout); 3354 3355 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3356 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3357 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) || 3358 ieee80211_do_assoc(sdata)) { 3359 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 3360 3361 ieee80211_destroy_assoc_data(sdata, false); 3362 cfg80211_assoc_timeout(sdata->dev, bss); 3363 } 3364 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3365 run_again(sdata, ifmgd->assoc_data->timeout); 3366 3367 if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL && 3368 ifmgd->associated) { 3369 u8 bssid[ETH_ALEN]; 3370 int max_tries; 3371 3372 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3373 3374 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3375 max_tries = max_nullfunc_tries; 3376 else 3377 max_tries = max_probe_tries; 3378 3379 /* ACK received for nullfunc probing frame */ 3380 if (!ifmgd->probe_send_count) 3381 ieee80211_reset_ap_probe(sdata); 3382 else if (ifmgd->nullfunc_failed) { 3383 if (ifmgd->probe_send_count < max_tries) { 3384 mlme_dbg(sdata, 3385 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3386 bssid, ifmgd->probe_send_count, 3387 max_tries); 3388 ieee80211_mgd_probe_ap_send(sdata); 3389 } else { 3390 mlme_dbg(sdata, 3391 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3392 bssid); 3393 ieee80211_sta_connection_lost(sdata, bssid, 3394 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3395 false); 3396 } 3397 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3398 run_again(sdata, ifmgd->probe_timeout); 3399 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 3400 mlme_dbg(sdata, 3401 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3402 bssid, probe_wait_ms); 3403 ieee80211_sta_connection_lost(sdata, bssid, 3404 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3405 } else if (ifmgd->probe_send_count < max_tries) { 3406 mlme_dbg(sdata, 3407 "No probe response from AP %pM after %dms, try %d/%i\n", 3408 bssid, probe_wait_ms, 3409 ifmgd->probe_send_count, max_tries); 3410 ieee80211_mgd_probe_ap_send(sdata); 3411 } else { 3412 /* 3413 * We actually lost the connection ... or did we? 3414 * Let's make sure! 3415 */ 3416 wiphy_debug(local->hw.wiphy, 3417 "%s: No probe response from AP %pM" 3418 " after %dms, disconnecting.\n", 3419 sdata->name, 3420 bssid, probe_wait_ms); 3421 3422 ieee80211_sta_connection_lost(sdata, bssid, 3423 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3424 } 3425 } 3426 3427 sdata_unlock(sdata); 3428 } 3429 3430 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3431 { 3432 struct ieee80211_sub_if_data *sdata = 3433 (struct ieee80211_sub_if_data *) data; 3434 struct ieee80211_local *local = sdata->local; 3435 3436 if (local->quiescing) 3437 return; 3438 3439 sdata->u.mgd.connection_loss = false; 3440 ieee80211_queue_work(&sdata->local->hw, 3441 &sdata->u.mgd.beacon_connection_loss_work); 3442 } 3443 3444 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3445 { 3446 struct ieee80211_sub_if_data *sdata = 3447 (struct ieee80211_sub_if_data *) data; 3448 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3449 struct ieee80211_local *local = sdata->local; 3450 3451 if (local->quiescing) 3452 return; 3453 3454 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3455 } 3456 3457 static void ieee80211_sta_monitor_work(struct work_struct *work) 3458 { 3459 struct ieee80211_sub_if_data *sdata = 3460 container_of(work, struct ieee80211_sub_if_data, 3461 u.mgd.monitor_work); 3462 3463 ieee80211_mgd_probe_ap(sdata, false); 3464 } 3465 3466 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3467 { 3468 u32 flags; 3469 3470 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3471 __ieee80211_stop_poll(sdata); 3472 3473 /* let's probe the connection once */ 3474 flags = sdata->local->hw.flags; 3475 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) 3476 ieee80211_queue_work(&sdata->local->hw, 3477 &sdata->u.mgd.monitor_work); 3478 /* and do all the other regular work too */ 3479 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3480 } 3481 } 3482 3483 #ifdef CONFIG_PM 3484 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 3485 { 3486 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3487 3488 sdata_lock(sdata); 3489 if (!ifmgd->associated) { 3490 sdata_unlock(sdata); 3491 return; 3492 } 3493 3494 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 3495 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 3496 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 3497 ieee80211_sta_connection_lost(sdata, 3498 ifmgd->associated->bssid, 3499 WLAN_REASON_UNSPECIFIED, 3500 true); 3501 sdata_unlock(sdata); 3502 return; 3503 } 3504 sdata_unlock(sdata); 3505 } 3506 #endif 3507 3508 /* interface setup */ 3509 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 3510 { 3511 struct ieee80211_if_managed *ifmgd; 3512 3513 ifmgd = &sdata->u.mgd; 3514 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 3515 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 3516 INIT_WORK(&ifmgd->beacon_connection_loss_work, 3517 ieee80211_beacon_connection_loss_work); 3518 INIT_WORK(&ifmgd->csa_connection_drop_work, 3519 ieee80211_csa_connection_drop_work); 3520 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work); 3521 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 3522 (unsigned long) sdata); 3523 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 3524 (unsigned long) sdata); 3525 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 3526 (unsigned long) sdata); 3527 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 3528 (unsigned long) sdata); 3529 3530 ifmgd->flags = 0; 3531 ifmgd->powersave = sdata->wdev.ps; 3532 ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues; 3533 ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len; 3534 ifmgd->p2p_noa_index = -1; 3535 3536 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 3537 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 3538 else 3539 ifmgd->req_smps = IEEE80211_SMPS_OFF; 3540 } 3541 3542 /* scan finished notification */ 3543 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 3544 { 3545 struct ieee80211_sub_if_data *sdata; 3546 3547 /* Restart STA timers */ 3548 rcu_read_lock(); 3549 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 3550 if (ieee80211_sdata_running(sdata)) 3551 ieee80211_restart_sta_timer(sdata); 3552 } 3553 rcu_read_unlock(); 3554 } 3555 3556 int ieee80211_max_network_latency(struct notifier_block *nb, 3557 unsigned long data, void *dummy) 3558 { 3559 s32 latency_usec = (s32) data; 3560 struct ieee80211_local *local = 3561 container_of(nb, struct ieee80211_local, 3562 network_latency_notifier); 3563 3564 mutex_lock(&local->iflist_mtx); 3565 ieee80211_recalc_ps(local, latency_usec); 3566 mutex_unlock(&local->iflist_mtx); 3567 3568 return 0; 3569 } 3570 3571 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 3572 struct cfg80211_bss *cbss) 3573 { 3574 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3575 const u8 *ht_cap_ie, *vht_cap_ie; 3576 const struct ieee80211_ht_cap *ht_cap; 3577 const struct ieee80211_vht_cap *vht_cap; 3578 u8 chains = 1; 3579 3580 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 3581 return chains; 3582 3583 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 3584 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 3585 ht_cap = (void *)(ht_cap_ie + 2); 3586 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 3587 /* 3588 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 3589 * "Tx Unequal Modulation Supported" fields. 3590 */ 3591 } 3592 3593 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 3594 return chains; 3595 3596 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 3597 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 3598 u8 nss; 3599 u16 tx_mcs_map; 3600 3601 vht_cap = (void *)(vht_cap_ie + 2); 3602 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 3603 for (nss = 8; nss > 0; nss--) { 3604 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 3605 IEEE80211_VHT_MCS_NOT_SUPPORTED) 3606 break; 3607 } 3608 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 3609 chains = max(chains, nss); 3610 } 3611 3612 return chains; 3613 } 3614 3615 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 3616 struct cfg80211_bss *cbss) 3617 { 3618 struct ieee80211_local *local = sdata->local; 3619 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3620 const struct ieee80211_ht_operation *ht_oper = NULL; 3621 const struct ieee80211_vht_operation *vht_oper = NULL; 3622 struct ieee80211_supported_band *sband; 3623 struct cfg80211_chan_def chandef; 3624 int ret; 3625 3626 sband = local->hw.wiphy->bands[cbss->channel->band]; 3627 3628 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 3629 IEEE80211_STA_DISABLE_80P80MHZ | 3630 IEEE80211_STA_DISABLE_160MHZ); 3631 3632 rcu_read_lock(); 3633 3634 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 3635 sband->ht_cap.ht_supported) { 3636 const u8 *ht_oper_ie, *ht_cap; 3637 3638 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 3639 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 3640 ht_oper = (void *)(ht_oper_ie + 2); 3641 3642 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 3643 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) { 3644 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 3645 ht_oper = NULL; 3646 } 3647 } 3648 3649 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 3650 sband->vht_cap.vht_supported) { 3651 const u8 *vht_oper_ie, *vht_cap; 3652 3653 vht_oper_ie = ieee80211_bss_get_ie(cbss, 3654 WLAN_EID_VHT_OPERATION); 3655 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 3656 vht_oper = (void *)(vht_oper_ie + 2); 3657 if (vht_oper && !ht_oper) { 3658 vht_oper = NULL; 3659 sdata_info(sdata, 3660 "AP advertised VHT without HT, disabling both\n"); 3661 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 3662 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 3663 } 3664 3665 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 3666 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 3667 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 3668 vht_oper = NULL; 3669 } 3670 } 3671 3672 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 3673 cbss->channel, 3674 ht_oper, vht_oper, 3675 &chandef, false); 3676 3677 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 3678 local->rx_chains); 3679 3680 rcu_read_unlock(); 3681 3682 /* will change later if needed */ 3683 sdata->smps_mode = IEEE80211_SMPS_OFF; 3684 3685 mutex_lock(&local->mtx); 3686 /* 3687 * If this fails (possibly due to channel context sharing 3688 * on incompatible channels, e.g. 80+80 and 160 sharing the 3689 * same control channel) try to use a smaller bandwidth. 3690 */ 3691 ret = ieee80211_vif_use_channel(sdata, &chandef, 3692 IEEE80211_CHANCTX_SHARED); 3693 3694 /* don't downgrade for 5 and 10 MHz channels, though. */ 3695 if (chandef.width == NL80211_CHAN_WIDTH_5 || 3696 chandef.width == NL80211_CHAN_WIDTH_10) 3697 goto out; 3698 3699 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 3700 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef); 3701 ret = ieee80211_vif_use_channel(sdata, &chandef, 3702 IEEE80211_CHANCTX_SHARED); 3703 } 3704 out: 3705 mutex_unlock(&local->mtx); 3706 return ret; 3707 } 3708 3709 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 3710 struct cfg80211_bss *cbss, bool assoc) 3711 { 3712 struct ieee80211_local *local = sdata->local; 3713 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3714 struct ieee80211_bss *bss = (void *)cbss->priv; 3715 struct sta_info *new_sta = NULL; 3716 bool have_sta = false; 3717 int err; 3718 3719 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 3720 return -EINVAL; 3721 3722 if (assoc) { 3723 rcu_read_lock(); 3724 have_sta = sta_info_get(sdata, cbss->bssid); 3725 rcu_read_unlock(); 3726 } 3727 3728 if (!have_sta) { 3729 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 3730 if (!new_sta) 3731 return -ENOMEM; 3732 } 3733 if (new_sta) { 3734 u32 rates = 0, basic_rates = 0; 3735 bool have_higher_than_11mbit; 3736 int min_rate = INT_MAX, min_rate_index = -1; 3737 struct ieee80211_chanctx_conf *chanctx_conf; 3738 struct ieee80211_supported_band *sband; 3739 const struct cfg80211_bss_ies *ies; 3740 int shift; 3741 u32 rate_flags; 3742 3743 sband = local->hw.wiphy->bands[cbss->channel->band]; 3744 3745 err = ieee80211_prep_channel(sdata, cbss); 3746 if (err) { 3747 sta_info_free(local, new_sta); 3748 return -EINVAL; 3749 } 3750 shift = ieee80211_vif_get_shift(&sdata->vif); 3751 3752 rcu_read_lock(); 3753 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3754 if (WARN_ON(!chanctx_conf)) { 3755 rcu_read_unlock(); 3756 return -EINVAL; 3757 } 3758 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 3759 rcu_read_unlock(); 3760 3761 ieee80211_get_rates(sband, bss->supp_rates, 3762 bss->supp_rates_len, 3763 &rates, &basic_rates, 3764 &have_higher_than_11mbit, 3765 &min_rate, &min_rate_index, 3766 shift, rate_flags); 3767 3768 /* 3769 * This used to be a workaround for basic rates missing 3770 * in the association response frame. Now that we no 3771 * longer use the basic rates from there, it probably 3772 * doesn't happen any more, but keep the workaround so 3773 * in case some *other* APs are buggy in different ways 3774 * we can connect -- with a warning. 3775 */ 3776 if (!basic_rates && min_rate_index >= 0) { 3777 sdata_info(sdata, 3778 "No basic rates, using min rate instead\n"); 3779 basic_rates = BIT(min_rate_index); 3780 } 3781 3782 new_sta->sta.supp_rates[cbss->channel->band] = rates; 3783 sdata->vif.bss_conf.basic_rates = basic_rates; 3784 3785 /* cf. IEEE 802.11 9.2.12 */ 3786 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 3787 have_higher_than_11mbit) 3788 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 3789 else 3790 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 3791 3792 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 3793 3794 /* set timing information */ 3795 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 3796 rcu_read_lock(); 3797 ies = rcu_dereference(cbss->beacon_ies); 3798 if (ies) { 3799 const u8 *tim_ie; 3800 3801 sdata->vif.bss_conf.sync_tsf = ies->tsf; 3802 sdata->vif.bss_conf.sync_device_ts = 3803 bss->device_ts_beacon; 3804 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 3805 ies->data, ies->len); 3806 if (tim_ie && tim_ie[1] >= 2) 3807 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 3808 else 3809 sdata->vif.bss_conf.sync_dtim_count = 0; 3810 } else if (!(local->hw.flags & 3811 IEEE80211_HW_TIMING_BEACON_ONLY)) { 3812 ies = rcu_dereference(cbss->proberesp_ies); 3813 /* must be non-NULL since beacon IEs were NULL */ 3814 sdata->vif.bss_conf.sync_tsf = ies->tsf; 3815 sdata->vif.bss_conf.sync_device_ts = 3816 bss->device_ts_presp; 3817 sdata->vif.bss_conf.sync_dtim_count = 0; 3818 } else { 3819 sdata->vif.bss_conf.sync_tsf = 0; 3820 sdata->vif.bss_conf.sync_device_ts = 0; 3821 sdata->vif.bss_conf.sync_dtim_count = 0; 3822 } 3823 rcu_read_unlock(); 3824 3825 /* tell driver about BSSID, basic rates and timing */ 3826 ieee80211_bss_info_change_notify(sdata, 3827 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 3828 BSS_CHANGED_BEACON_INT); 3829 3830 if (assoc) 3831 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 3832 3833 err = sta_info_insert(new_sta); 3834 new_sta = NULL; 3835 if (err) { 3836 sdata_info(sdata, 3837 "failed to insert STA entry for the AP (error %d)\n", 3838 err); 3839 return err; 3840 } 3841 } else 3842 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 3843 3844 return 0; 3845 } 3846 3847 /* config hooks */ 3848 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 3849 struct cfg80211_auth_request *req) 3850 { 3851 struct ieee80211_local *local = sdata->local; 3852 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3853 struct ieee80211_mgd_auth_data *auth_data; 3854 u16 auth_alg; 3855 int err; 3856 3857 /* prepare auth data structure */ 3858 3859 switch (req->auth_type) { 3860 case NL80211_AUTHTYPE_OPEN_SYSTEM: 3861 auth_alg = WLAN_AUTH_OPEN; 3862 break; 3863 case NL80211_AUTHTYPE_SHARED_KEY: 3864 if (IS_ERR(local->wep_tx_tfm)) 3865 return -EOPNOTSUPP; 3866 auth_alg = WLAN_AUTH_SHARED_KEY; 3867 break; 3868 case NL80211_AUTHTYPE_FT: 3869 auth_alg = WLAN_AUTH_FT; 3870 break; 3871 case NL80211_AUTHTYPE_NETWORK_EAP: 3872 auth_alg = WLAN_AUTH_LEAP; 3873 break; 3874 case NL80211_AUTHTYPE_SAE: 3875 auth_alg = WLAN_AUTH_SAE; 3876 break; 3877 default: 3878 return -EOPNOTSUPP; 3879 } 3880 3881 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 3882 req->ie_len, GFP_KERNEL); 3883 if (!auth_data) 3884 return -ENOMEM; 3885 3886 auth_data->bss = req->bss; 3887 3888 if (req->sae_data_len >= 4) { 3889 __le16 *pos = (__le16 *) req->sae_data; 3890 auth_data->sae_trans = le16_to_cpu(pos[0]); 3891 auth_data->sae_status = le16_to_cpu(pos[1]); 3892 memcpy(auth_data->data, req->sae_data + 4, 3893 req->sae_data_len - 4); 3894 auth_data->data_len += req->sae_data_len - 4; 3895 } 3896 3897 if (req->ie && req->ie_len) { 3898 memcpy(&auth_data->data[auth_data->data_len], 3899 req->ie, req->ie_len); 3900 auth_data->data_len += req->ie_len; 3901 } 3902 3903 if (req->key && req->key_len) { 3904 auth_data->key_len = req->key_len; 3905 auth_data->key_idx = req->key_idx; 3906 memcpy(auth_data->key, req->key, req->key_len); 3907 } 3908 3909 auth_data->algorithm = auth_alg; 3910 3911 /* try to authenticate/probe */ 3912 3913 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 3914 ifmgd->assoc_data) { 3915 err = -EBUSY; 3916 goto err_free; 3917 } 3918 3919 if (ifmgd->auth_data) 3920 ieee80211_destroy_auth_data(sdata, false); 3921 3922 /* prep auth_data so we don't go into idle on disassoc */ 3923 ifmgd->auth_data = auth_data; 3924 3925 if (ifmgd->associated) { 3926 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3927 3928 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3929 WLAN_REASON_UNSPECIFIED, 3930 false, frame_buf); 3931 3932 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 3933 sizeof(frame_buf)); 3934 } 3935 3936 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 3937 3938 err = ieee80211_prep_connection(sdata, req->bss, false); 3939 if (err) 3940 goto err_clear; 3941 3942 err = ieee80211_probe_auth(sdata); 3943 if (err) { 3944 sta_info_destroy_addr(sdata, req->bss->bssid); 3945 goto err_clear; 3946 } 3947 3948 /* hold our own reference */ 3949 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 3950 return 0; 3951 3952 err_clear: 3953 memset(ifmgd->bssid, 0, ETH_ALEN); 3954 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 3955 ifmgd->auth_data = NULL; 3956 err_free: 3957 kfree(auth_data); 3958 return err; 3959 } 3960 3961 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata, 3962 const u8 *wmm_param, int len) 3963 { 3964 const u8 *pos; 3965 size_t left; 3966 3967 if (len < 8) 3968 return false; 3969 3970 if (wmm_param[5] != 1 /* version */) 3971 return false; 3972 3973 pos = wmm_param + 8; 3974 left = len - 8; 3975 3976 for (; left >= 4; left -= 4, pos += 4) { 3977 u8 aifsn = pos[0] & 0x0f; 3978 u8 ecwmin = pos[1] & 0x0f; 3979 u8 ecwmax = (pos[1] & 0xf0) >> 4; 3980 int aci = (pos[0] >> 5) & 0x03; 3981 3982 if (aifsn < 2) { 3983 sdata_info(sdata, 3984 "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n", 3985 aifsn, aci); 3986 return false; 3987 } 3988 if (ecwmin > ecwmax) { 3989 sdata_info(sdata, 3990 "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n", 3991 ecwmin, ecwmax, aci); 3992 return false; 3993 } 3994 } 3995 3996 return true; 3997 } 3998 3999 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 4000 struct cfg80211_assoc_request *req) 4001 { 4002 struct ieee80211_local *local = sdata->local; 4003 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4004 struct ieee80211_bss *bss = (void *)req->bss->priv; 4005 struct ieee80211_mgd_assoc_data *assoc_data; 4006 const struct cfg80211_bss_ies *beacon_ies; 4007 struct ieee80211_supported_band *sband; 4008 const u8 *ssidie, *ht_ie, *vht_ie; 4009 int i, err; 4010 4011 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4012 if (!assoc_data) 4013 return -ENOMEM; 4014 4015 rcu_read_lock(); 4016 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4017 if (!ssidie) { 4018 rcu_read_unlock(); 4019 kfree(assoc_data); 4020 return -EINVAL; 4021 } 4022 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4023 assoc_data->ssid_len = ssidie[1]; 4024 rcu_read_unlock(); 4025 4026 if (ifmgd->associated) { 4027 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4028 4029 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4030 WLAN_REASON_UNSPECIFIED, 4031 false, frame_buf); 4032 4033 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4034 sizeof(frame_buf)); 4035 } 4036 4037 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4038 err = -EBUSY; 4039 goto err_free; 4040 } 4041 4042 if (ifmgd->assoc_data) { 4043 err = -EBUSY; 4044 goto err_free; 4045 } 4046 4047 if (ifmgd->auth_data) { 4048 bool match; 4049 4050 /* keep sta info, bssid if matching */ 4051 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4052 ieee80211_destroy_auth_data(sdata, match); 4053 } 4054 4055 /* prepare assoc data */ 4056 4057 ifmgd->beacon_crc_valid = false; 4058 4059 assoc_data->wmm = bss->wmm_used && 4060 (local->hw.queues >= IEEE80211_NUM_ACS); 4061 if (assoc_data->wmm) { 4062 /* try to check validity of WMM params IE */ 4063 const struct cfg80211_bss_ies *ies; 4064 const u8 *wp, *start, *end; 4065 4066 rcu_read_lock(); 4067 ies = rcu_dereference(req->bss->ies); 4068 start = ies->data; 4069 end = start + ies->len; 4070 4071 while (true) { 4072 wp = cfg80211_find_vendor_ie( 4073 WLAN_OUI_MICROSOFT, 4074 WLAN_OUI_TYPE_MICROSOFT_WMM, 4075 start, end - start); 4076 if (!wp) 4077 break; 4078 start = wp + wp[1] + 2; 4079 /* if this IE is too short, try the next */ 4080 if (wp[1] <= 4) 4081 continue; 4082 /* if this IE is WMM params, we found what we wanted */ 4083 if (wp[6] == 1) 4084 break; 4085 } 4086 4087 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2, 4088 wp[1] - 2)) { 4089 assoc_data->wmm = false; 4090 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM; 4091 } 4092 rcu_read_unlock(); 4093 } 4094 4095 /* 4096 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4097 * We still associate in non-HT mode (11a/b/g) if any one of these 4098 * ciphers is configured as pairwise. 4099 * We can set this to true for non-11n hardware, that'll be checked 4100 * separately along with the peer capabilities. 4101 */ 4102 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4103 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4104 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4105 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4106 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4107 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4108 netdev_info(sdata->dev, 4109 "disabling HT/VHT due to WEP/TKIP use\n"); 4110 } 4111 } 4112 4113 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4114 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4115 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4116 } 4117 4118 if (req->flags & ASSOC_REQ_DISABLE_VHT) 4119 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4120 4121 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4122 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4123 if (!sband->ht_cap.ht_supported || 4124 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4125 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4126 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4127 if (!bss->wmm_used && 4128 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4129 netdev_info(sdata->dev, 4130 "disabling HT as WMM/QoS is not supported by the AP\n"); 4131 } 4132 4133 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4134 if (!sband->vht_cap.vht_supported || 4135 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used || 4136 ifmgd->flags & IEEE80211_STA_DISABLE_WMM) { 4137 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4138 if (!bss->wmm_used && 4139 !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM)) 4140 netdev_info(sdata->dev, 4141 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4142 } 4143 4144 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4145 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4146 sizeof(ifmgd->ht_capa_mask)); 4147 4148 memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa)); 4149 memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask, 4150 sizeof(ifmgd->vht_capa_mask)); 4151 4152 if (req->ie && req->ie_len) { 4153 memcpy(assoc_data->ie, req->ie, req->ie_len); 4154 assoc_data->ie_len = req->ie_len; 4155 } 4156 4157 assoc_data->bss = req->bss; 4158 4159 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4160 if (ifmgd->powersave) 4161 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4162 else 4163 sdata->smps_mode = IEEE80211_SMPS_OFF; 4164 } else 4165 sdata->smps_mode = ifmgd->req_smps; 4166 4167 assoc_data->capability = req->bss->capability; 4168 assoc_data->supp_rates = bss->supp_rates; 4169 assoc_data->supp_rates_len = bss->supp_rates_len; 4170 4171 rcu_read_lock(); 4172 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4173 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4174 assoc_data->ap_ht_param = 4175 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4176 else 4177 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4178 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4179 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4180 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4181 sizeof(struct ieee80211_vht_cap)); 4182 else 4183 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4184 rcu_read_unlock(); 4185 4186 if (bss->wmm_used && bss->uapsd_supported && 4187 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) && 4188 sdata->wmm_acm != 0xff) { 4189 assoc_data->uapsd = true; 4190 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4191 } else { 4192 assoc_data->uapsd = false; 4193 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4194 } 4195 4196 if (req->prev_bssid) 4197 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4198 4199 if (req->use_mfp) { 4200 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4201 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4202 } else { 4203 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4204 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4205 } 4206 4207 if (req->crypto.control_port) 4208 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4209 else 4210 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4211 4212 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4213 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4214 sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto, 4215 sdata->vif.type); 4216 4217 /* kick off associate process */ 4218 4219 ifmgd->assoc_data = assoc_data; 4220 ifmgd->dtim_period = 0; 4221 ifmgd->have_beacon = false; 4222 4223 err = ieee80211_prep_connection(sdata, req->bss, true); 4224 if (err) 4225 goto err_clear; 4226 4227 rcu_read_lock(); 4228 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4229 4230 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC && 4231 !beacon_ies) { 4232 /* 4233 * Wait up to one beacon interval ... 4234 * should this be more if we miss one? 4235 */ 4236 sdata_info(sdata, "waiting for beacon from %pM\n", 4237 ifmgd->bssid); 4238 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4239 assoc_data->timeout_started = true; 4240 assoc_data->need_beacon = true; 4241 } else if (beacon_ies) { 4242 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4243 beacon_ies->data, 4244 beacon_ies->len); 4245 u8 dtim_count = 0; 4246 4247 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4248 const struct ieee80211_tim_ie *tim; 4249 tim = (void *)(tim_ie + 2); 4250 ifmgd->dtim_period = tim->dtim_period; 4251 dtim_count = tim->dtim_count; 4252 } 4253 ifmgd->have_beacon = true; 4254 assoc_data->timeout = jiffies; 4255 assoc_data->timeout_started = true; 4256 4257 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 4258 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4259 sdata->vif.bss_conf.sync_device_ts = 4260 bss->device_ts_beacon; 4261 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4262 } 4263 } else { 4264 assoc_data->timeout = jiffies; 4265 assoc_data->timeout_started = true; 4266 } 4267 rcu_read_unlock(); 4268 4269 run_again(sdata, assoc_data->timeout); 4270 4271 if (bss->corrupt_data) { 4272 char *corrupt_type = "data"; 4273 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4274 if (bss->corrupt_data & 4275 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4276 corrupt_type = "beacon and probe response"; 4277 else 4278 corrupt_type = "beacon"; 4279 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4280 corrupt_type = "probe response"; 4281 sdata_info(sdata, "associating with AP with corrupt %s\n", 4282 corrupt_type); 4283 } 4284 4285 return 0; 4286 err_clear: 4287 memset(ifmgd->bssid, 0, ETH_ALEN); 4288 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4289 ifmgd->assoc_data = NULL; 4290 err_free: 4291 kfree(assoc_data); 4292 return err; 4293 } 4294 4295 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4296 struct cfg80211_deauth_request *req) 4297 { 4298 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4299 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4300 bool tx = !req->local_state_change; 4301 bool report_frame = false; 4302 4303 sdata_info(sdata, 4304 "deauthenticating from %pM by local choice (reason=%d)\n", 4305 req->bssid, req->reason_code); 4306 4307 if (ifmgd->auth_data) { 4308 drv_mgd_prepare_tx(sdata->local, sdata); 4309 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4310 IEEE80211_STYPE_DEAUTH, 4311 req->reason_code, tx, 4312 frame_buf); 4313 ieee80211_destroy_auth_data(sdata, false); 4314 4315 report_frame = true; 4316 goto out; 4317 } 4318 4319 if (ifmgd->associated && 4320 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4321 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4322 req->reason_code, tx, frame_buf); 4323 report_frame = true; 4324 } 4325 4326 out: 4327 if (report_frame) 4328 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4329 IEEE80211_DEAUTH_FRAME_LEN); 4330 4331 return 0; 4332 } 4333 4334 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4335 struct cfg80211_disassoc_request *req) 4336 { 4337 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4338 u8 bssid[ETH_ALEN]; 4339 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4340 4341 /* 4342 * cfg80211 should catch this ... but it's racy since 4343 * we can receive a disassoc frame, process it, hand it 4344 * to cfg80211 while that's in a locked section already 4345 * trying to tell us that the user wants to disconnect. 4346 */ 4347 if (ifmgd->associated != req->bss) 4348 return -ENOLINK; 4349 4350 sdata_info(sdata, 4351 "disassociating from %pM by local choice (reason=%d)\n", 4352 req->bss->bssid, req->reason_code); 4353 4354 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4355 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4356 req->reason_code, !req->local_state_change, 4357 frame_buf); 4358 4359 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, 4360 IEEE80211_DEAUTH_FRAME_LEN); 4361 4362 return 0; 4363 } 4364 4365 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4366 { 4367 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4368 4369 /* 4370 * Make sure some work items will not run after this, 4371 * they will not do anything but might not have been 4372 * cancelled when disconnecting. 4373 */ 4374 cancel_work_sync(&ifmgd->monitor_work); 4375 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 4376 cancel_work_sync(&ifmgd->request_smps_work); 4377 cancel_work_sync(&ifmgd->csa_connection_drop_work); 4378 cancel_work_sync(&ifmgd->chswitch_work); 4379 4380 sdata_lock(sdata); 4381 if (ifmgd->assoc_data) { 4382 struct cfg80211_bss *bss = ifmgd->assoc_data->bss; 4383 ieee80211_destroy_assoc_data(sdata, false); 4384 cfg80211_assoc_timeout(sdata->dev, bss); 4385 } 4386 if (ifmgd->auth_data) 4387 ieee80211_destroy_auth_data(sdata, false); 4388 del_timer_sync(&ifmgd->timer); 4389 sdata_unlock(sdata); 4390 } 4391 4392 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4393 enum nl80211_cqm_rssi_threshold_event rssi_event, 4394 gfp_t gfp) 4395 { 4396 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4397 4398 trace_api_cqm_rssi_notify(sdata, rssi_event); 4399 4400 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 4401 } 4402 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 4403