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_SHORT (HZ / 10) 35 #define IEEE80211_AUTH_MAX_TRIES 3 36 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) 37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 38 #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) 39 #define IEEE80211_ASSOC_MAX_TRIES 3 40 41 static int max_nullfunc_tries = 2; 42 module_param(max_nullfunc_tries, int, 0644); 43 MODULE_PARM_DESC(max_nullfunc_tries, 44 "Maximum nullfunc tx tries before disconnecting (reason 4)."); 45 46 static int max_probe_tries = 5; 47 module_param(max_probe_tries, int, 0644); 48 MODULE_PARM_DESC(max_probe_tries, 49 "Maximum probe tries before disconnecting (reason 4)."); 50 51 /* 52 * Beacon loss timeout is calculated as N frames times the 53 * advertised beacon interval. This may need to be somewhat 54 * higher than what hardware might detect to account for 55 * delays in the host processing frames. But since we also 56 * probe on beacon miss before declaring the connection lost 57 * default to what we want. 58 */ 59 #define IEEE80211_BEACON_LOSS_COUNT 7 60 61 /* 62 * Time the connection can be idle before we probe 63 * it to see if we can still talk to the AP. 64 */ 65 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) 66 /* 67 * Time we wait for a probe response after sending 68 * a probe request because of beacon loss or for 69 * checking the connection still works. 70 */ 71 static int probe_wait_ms = 500; 72 module_param(probe_wait_ms, int, 0644); 73 MODULE_PARM_DESC(probe_wait_ms, 74 "Maximum time(ms) to wait for probe response" 75 " before disconnecting (reason 4)."); 76 77 /* 78 * Weight given to the latest Beacon frame when calculating average signal 79 * strength for Beacon frames received in the current BSS. This must be 80 * between 1 and 15. 81 */ 82 #define IEEE80211_SIGNAL_AVE_WEIGHT 3 83 84 /* 85 * How many Beacon frames need to have been used in average signal strength 86 * before starting to indicate signal change events. 87 */ 88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 89 90 #define TMR_RUNNING_TIMER 0 91 #define TMR_RUNNING_CHANSW 1 92 93 /* 94 * All cfg80211 functions have to be called outside a locked 95 * section so that they can acquire a lock themselves... This 96 * is much simpler than queuing up things in cfg80211, but we 97 * do need some indirection for that here. 98 */ 99 enum rx_mgmt_action { 100 /* no action required */ 101 RX_MGMT_NONE, 102 103 /* caller must call cfg80211_send_deauth() */ 104 RX_MGMT_CFG80211_DEAUTH, 105 106 /* caller must call cfg80211_send_disassoc() */ 107 RX_MGMT_CFG80211_DISASSOC, 108 109 /* caller must call cfg80211_send_rx_auth() */ 110 RX_MGMT_CFG80211_RX_AUTH, 111 112 /* caller must call cfg80211_send_rx_assoc() */ 113 RX_MGMT_CFG80211_RX_ASSOC, 114 115 /* caller must call cfg80211_send_assoc_timeout() */ 116 RX_MGMT_CFG80211_ASSOC_TIMEOUT, 117 118 /* used when a processed beacon causes a deauth */ 119 RX_MGMT_CFG80211_TX_DEAUTH, 120 }; 121 122 /* utils */ 123 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) 124 { 125 lockdep_assert_held(&ifmgd->mtx); 126 } 127 128 /* 129 * We can have multiple work items (and connection probing) 130 * scheduling this timer, but we need to take care to only 131 * reschedule it when it should fire _earlier_ than it was 132 * asked for before, or if it's not pending right now. This 133 * function ensures that. Note that it then is required to 134 * run this function for all timeouts after the first one 135 * has happened -- the work that runs from this timer will 136 * do that. 137 */ 138 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout) 139 { 140 ASSERT_MGD_MTX(ifmgd); 141 142 if (!timer_pending(&ifmgd->timer) || 143 time_before(timeout, ifmgd->timer.expires)) 144 mod_timer(&ifmgd->timer, timeout); 145 } 146 147 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) 148 { 149 if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) 150 return; 151 152 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 153 return; 154 155 mod_timer(&sdata->u.mgd.bcn_mon_timer, 156 round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); 157 } 158 159 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) 160 { 161 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 162 163 if (unlikely(!sdata->u.mgd.associated)) 164 return; 165 166 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 167 return; 168 169 mod_timer(&sdata->u.mgd.conn_mon_timer, 170 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); 171 172 ifmgd->probe_send_count = 0; 173 } 174 175 static int ecw2cw(int ecw) 176 { 177 return (1 << ecw) - 1; 178 } 179 180 static u32 chandef_downgrade(struct cfg80211_chan_def *c) 181 { 182 u32 ret; 183 int tmp; 184 185 switch (c->width) { 186 case NL80211_CHAN_WIDTH_20: 187 c->width = NL80211_CHAN_WIDTH_20_NOHT; 188 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 189 break; 190 case NL80211_CHAN_WIDTH_40: 191 c->width = NL80211_CHAN_WIDTH_20; 192 c->center_freq1 = c->chan->center_freq; 193 ret = IEEE80211_STA_DISABLE_40MHZ | 194 IEEE80211_STA_DISABLE_VHT; 195 break; 196 case NL80211_CHAN_WIDTH_80: 197 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 198 /* n_P40 */ 199 tmp /= 2; 200 /* freq_P40 */ 201 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp; 202 c->width = NL80211_CHAN_WIDTH_40; 203 ret = IEEE80211_STA_DISABLE_VHT; 204 break; 205 case NL80211_CHAN_WIDTH_80P80: 206 c->center_freq2 = 0; 207 c->width = NL80211_CHAN_WIDTH_80; 208 ret = IEEE80211_STA_DISABLE_80P80MHZ | 209 IEEE80211_STA_DISABLE_160MHZ; 210 break; 211 case NL80211_CHAN_WIDTH_160: 212 /* n_P20 */ 213 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 214 /* n_P80 */ 215 tmp /= 4; 216 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp; 217 c->width = NL80211_CHAN_WIDTH_80; 218 ret = IEEE80211_STA_DISABLE_80P80MHZ | 219 IEEE80211_STA_DISABLE_160MHZ; 220 break; 221 default: 222 case NL80211_CHAN_WIDTH_20_NOHT: 223 WARN_ON_ONCE(1); 224 c->width = NL80211_CHAN_WIDTH_20_NOHT; 225 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 226 break; 227 } 228 229 WARN_ON_ONCE(!cfg80211_chandef_valid(c)); 230 231 return ret; 232 } 233 234 static u32 235 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, 236 struct ieee80211_supported_band *sband, 237 struct ieee80211_channel *channel, 238 const struct ieee80211_ht_operation *ht_oper, 239 const struct ieee80211_vht_operation *vht_oper, 240 struct cfg80211_chan_def *chandef, bool verbose) 241 { 242 struct cfg80211_chan_def vht_chandef; 243 u32 ht_cfreq, ret; 244 245 chandef->chan = channel; 246 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 247 chandef->center_freq1 = channel->center_freq; 248 chandef->center_freq2 = 0; 249 250 if (!ht_oper || !sband->ht_cap.ht_supported) { 251 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 252 goto out; 253 } 254 255 chandef->width = NL80211_CHAN_WIDTH_20; 256 257 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, 258 channel->band); 259 /* check that channel matches the right operating channel */ 260 if (channel->center_freq != ht_cfreq) { 261 /* 262 * It's possible that some APs are confused here; 263 * Netgear WNDR3700 sometimes reports 4 higher than 264 * the actual channel in association responses, but 265 * since we look at probe response/beacon data here 266 * it should be OK. 267 */ 268 if (verbose) 269 sdata_info(sdata, 270 "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", 271 channel->center_freq, ht_cfreq, 272 ht_oper->primary_chan, channel->band); 273 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 274 goto out; 275 } 276 277 /* check 40 MHz support, if we have it */ 278 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { 279 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 280 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 281 chandef->width = NL80211_CHAN_WIDTH_40; 282 chandef->center_freq1 += 10; 283 break; 284 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 285 chandef->width = NL80211_CHAN_WIDTH_40; 286 chandef->center_freq1 -= 10; 287 break; 288 } 289 } else { 290 /* 40 MHz (and 80 MHz) must be supported for VHT */ 291 ret = IEEE80211_STA_DISABLE_VHT; 292 goto out; 293 } 294 295 if (!vht_oper || !sband->vht_cap.vht_supported) { 296 ret = IEEE80211_STA_DISABLE_VHT; 297 goto out; 298 } 299 300 vht_chandef.chan = channel; 301 vht_chandef.center_freq1 = 302 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx, 303 channel->band); 304 vht_chandef.center_freq2 = 0; 305 306 if (vht_oper->center_freq_seg2_idx) 307 vht_chandef.center_freq2 = 308 ieee80211_channel_to_frequency( 309 vht_oper->center_freq_seg2_idx, 310 channel->band); 311 312 switch (vht_oper->chan_width) { 313 case IEEE80211_VHT_CHANWIDTH_USE_HT: 314 vht_chandef.width = chandef->width; 315 break; 316 case IEEE80211_VHT_CHANWIDTH_80MHZ: 317 vht_chandef.width = NL80211_CHAN_WIDTH_80; 318 break; 319 case IEEE80211_VHT_CHANWIDTH_160MHZ: 320 vht_chandef.width = NL80211_CHAN_WIDTH_160; 321 break; 322 case IEEE80211_VHT_CHANWIDTH_80P80MHZ: 323 vht_chandef.width = NL80211_CHAN_WIDTH_80P80; 324 break; 325 default: 326 if (verbose) 327 sdata_info(sdata, 328 "AP VHT operation IE has invalid channel width (%d), disable VHT\n", 329 vht_oper->chan_width); 330 ret = IEEE80211_STA_DISABLE_VHT; 331 goto out; 332 } 333 334 if (!cfg80211_chandef_valid(&vht_chandef)) { 335 if (verbose) 336 sdata_info(sdata, 337 "AP VHT information is invalid, disable VHT\n"); 338 ret = IEEE80211_STA_DISABLE_VHT; 339 goto out; 340 } 341 342 if (cfg80211_chandef_identical(chandef, &vht_chandef)) { 343 ret = 0; 344 goto out; 345 } 346 347 if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { 348 if (verbose) 349 sdata_info(sdata, 350 "AP VHT information doesn't match HT, disable VHT\n"); 351 ret = IEEE80211_STA_DISABLE_VHT; 352 goto out; 353 } 354 355 *chandef = vht_chandef; 356 357 ret = 0; 358 359 out: 360 /* don't print the message below for VHT mismatch if VHT is disabled */ 361 if (ret & IEEE80211_STA_DISABLE_VHT) 362 vht_chandef = *chandef; 363 364 while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 365 IEEE80211_CHAN_DISABLED)) { 366 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { 367 ret = IEEE80211_STA_DISABLE_HT | 368 IEEE80211_STA_DISABLE_VHT; 369 goto out; 370 } 371 372 ret |= chandef_downgrade(chandef); 373 } 374 375 if (chandef->width != vht_chandef.width && verbose) 376 sdata_info(sdata, 377 "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); 378 379 WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); 380 return ret; 381 } 382 383 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, 384 struct sta_info *sta, 385 const struct ieee80211_ht_operation *ht_oper, 386 const struct ieee80211_vht_operation *vht_oper, 387 const u8 *bssid, u32 *changed) 388 { 389 struct ieee80211_local *local = sdata->local; 390 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 391 struct ieee80211_supported_band *sband; 392 struct ieee80211_channel *chan; 393 struct cfg80211_chan_def chandef; 394 u16 ht_opmode; 395 u32 flags; 396 enum ieee80211_sta_rx_bandwidth new_sta_bw; 397 int ret; 398 399 /* if HT was/is disabled, don't track any bandwidth changes */ 400 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) 401 return 0; 402 403 /* don't check VHT if we associated as non-VHT station */ 404 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 405 vht_oper = NULL; 406 407 if (WARN_ON_ONCE(!sta)) 408 return -EINVAL; 409 410 chan = sdata->vif.bss_conf.chandef.chan; 411 sband = local->hw.wiphy->bands[chan->band]; 412 413 /* calculate new channel (type) based on HT/VHT operation IEs */ 414 flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper, 415 vht_oper, &chandef, false); 416 417 /* 418 * Downgrade the new channel if we associated with restricted 419 * capabilities. For example, if we associated as a 20 MHz STA 420 * to a 40 MHz AP (due to regulatory, capabilities or config 421 * reasons) then switching to a 40 MHz channel now won't do us 422 * any good -- we couldn't use it with the AP. 423 */ 424 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && 425 chandef.width == NL80211_CHAN_WIDTH_80P80) 426 flags |= chandef_downgrade(&chandef); 427 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && 428 chandef.width == NL80211_CHAN_WIDTH_160) 429 flags |= chandef_downgrade(&chandef); 430 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && 431 chandef.width > NL80211_CHAN_WIDTH_20) 432 flags |= chandef_downgrade(&chandef); 433 434 if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) 435 return 0; 436 437 sdata_info(sdata, 438 "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", 439 ifmgd->bssid, chandef.chan->center_freq, chandef.width, 440 chandef.center_freq1, chandef.center_freq2); 441 442 if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | 443 IEEE80211_STA_DISABLE_VHT | 444 IEEE80211_STA_DISABLE_40MHZ | 445 IEEE80211_STA_DISABLE_80P80MHZ | 446 IEEE80211_STA_DISABLE_160MHZ)) || 447 !cfg80211_chandef_valid(&chandef)) { 448 sdata_info(sdata, 449 "AP %pM changed bandwidth in a way we can't support - disconnect\n", 450 ifmgd->bssid); 451 return -EINVAL; 452 } 453 454 switch (chandef.width) { 455 case NL80211_CHAN_WIDTH_20_NOHT: 456 case NL80211_CHAN_WIDTH_20: 457 new_sta_bw = IEEE80211_STA_RX_BW_20; 458 break; 459 case NL80211_CHAN_WIDTH_40: 460 new_sta_bw = IEEE80211_STA_RX_BW_40; 461 break; 462 case NL80211_CHAN_WIDTH_80: 463 new_sta_bw = IEEE80211_STA_RX_BW_80; 464 break; 465 case NL80211_CHAN_WIDTH_80P80: 466 case NL80211_CHAN_WIDTH_160: 467 new_sta_bw = IEEE80211_STA_RX_BW_160; 468 break; 469 default: 470 return -EINVAL; 471 } 472 473 if (new_sta_bw > sta->cur_max_bandwidth) 474 new_sta_bw = sta->cur_max_bandwidth; 475 476 if (new_sta_bw < sta->sta.bandwidth) { 477 sta->sta.bandwidth = new_sta_bw; 478 rate_control_rate_update(local, sband, sta, 479 IEEE80211_RC_BW_CHANGED); 480 } 481 482 ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); 483 if (ret) { 484 sdata_info(sdata, 485 "AP %pM changed bandwidth to incompatible one - disconnect\n", 486 ifmgd->bssid); 487 return ret; 488 } 489 490 if (new_sta_bw > sta->sta.bandwidth) { 491 sta->sta.bandwidth = new_sta_bw; 492 rate_control_rate_update(local, sband, sta, 493 IEEE80211_RC_BW_CHANGED); 494 } 495 496 ht_opmode = le16_to_cpu(ht_oper->operation_mode); 497 498 /* if bss configuration changed store the new one */ 499 if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { 500 *changed |= BSS_CHANGED_HT; 501 sdata->vif.bss_conf.ht_operation_mode = ht_opmode; 502 } 503 504 return 0; 505 } 506 507 /* frame sending functions */ 508 509 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len, 510 struct ieee80211_supported_band *sband, 511 u32 *rates) 512 { 513 int i, j, count; 514 *rates = 0; 515 count = 0; 516 for (i = 0; i < supp_rates_len; i++) { 517 int rate = (supp_rates[i] & 0x7F) * 5; 518 519 for (j = 0; j < sband->n_bitrates; j++) 520 if (sband->bitrates[j].bitrate == rate) { 521 *rates |= BIT(j); 522 count++; 523 break; 524 } 525 } 526 527 return count; 528 } 529 530 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, 531 struct sk_buff *skb, u8 ap_ht_param, 532 struct ieee80211_supported_band *sband, 533 struct ieee80211_channel *channel, 534 enum ieee80211_smps_mode smps) 535 { 536 u8 *pos; 537 u32 flags = channel->flags; 538 u16 cap; 539 struct ieee80211_sta_ht_cap ht_cap; 540 541 BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); 542 543 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 544 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 545 546 /* determine capability flags */ 547 cap = ht_cap.cap; 548 549 switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 550 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 551 if (flags & IEEE80211_CHAN_NO_HT40PLUS) { 552 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 553 cap &= ~IEEE80211_HT_CAP_SGI_40; 554 } 555 break; 556 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 557 if (flags & IEEE80211_CHAN_NO_HT40MINUS) { 558 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 559 cap &= ~IEEE80211_HT_CAP_SGI_40; 560 } 561 break; 562 } 563 564 /* 565 * If 40 MHz was disabled associate as though we weren't 566 * capable of 40 MHz -- some broken APs will never fall 567 * back to trying to transmit in 20 MHz. 568 */ 569 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { 570 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 571 cap &= ~IEEE80211_HT_CAP_SGI_40; 572 } 573 574 /* set SM PS mode properly */ 575 cap &= ~IEEE80211_HT_CAP_SM_PS; 576 switch (smps) { 577 case IEEE80211_SMPS_AUTOMATIC: 578 case IEEE80211_SMPS_NUM_MODES: 579 WARN_ON(1); 580 case IEEE80211_SMPS_OFF: 581 cap |= WLAN_HT_CAP_SM_PS_DISABLED << 582 IEEE80211_HT_CAP_SM_PS_SHIFT; 583 break; 584 case IEEE80211_SMPS_STATIC: 585 cap |= WLAN_HT_CAP_SM_PS_STATIC << 586 IEEE80211_HT_CAP_SM_PS_SHIFT; 587 break; 588 case IEEE80211_SMPS_DYNAMIC: 589 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << 590 IEEE80211_HT_CAP_SM_PS_SHIFT; 591 break; 592 } 593 594 /* reserve and fill IE */ 595 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); 596 ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); 597 } 598 599 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, 600 struct sk_buff *skb, 601 struct ieee80211_supported_band *sband, 602 struct ieee80211_vht_cap *ap_vht_cap) 603 { 604 u8 *pos; 605 u32 cap; 606 struct ieee80211_sta_vht_cap vht_cap; 607 int i; 608 609 BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); 610 611 memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); 612 613 /* determine capability flags */ 614 cap = vht_cap.cap; 615 616 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { 617 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ; 618 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 619 } 620 621 if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { 622 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; 623 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; 624 } 625 626 /* 627 * Some APs apparently get confused if our capabilities are better 628 * than theirs, so restrict what we advertise in the assoc request. 629 */ 630 if (!(ap_vht_cap->vht_cap_info & 631 cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) 632 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE; 633 634 if (!(ap_vht_cap->vht_cap_info & 635 cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC))) 636 cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 | 637 IEEE80211_VHT_CAP_RXSTBC_3 | 638 IEEE80211_VHT_CAP_RXSTBC_4); 639 640 for (i = 0; i < 8; i++) { 641 int shift = i * 2; 642 u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift; 643 u16 ap_mcs, our_mcs; 644 645 ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) & 646 mask) >> shift; 647 our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) & 648 mask) >> shift; 649 650 switch (ap_mcs) { 651 default: 652 if (our_mcs <= ap_mcs) 653 break; 654 /* fall through */ 655 case IEEE80211_VHT_MCS_NOT_SUPPORTED: 656 vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask); 657 vht_cap.vht_mcs.rx_mcs_map |= 658 cpu_to_le16(ap_mcs << shift); 659 } 660 } 661 662 /* reserve and fill IE */ 663 pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); 664 ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); 665 } 666 667 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) 668 { 669 struct ieee80211_local *local = sdata->local; 670 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 671 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 672 struct sk_buff *skb; 673 struct ieee80211_mgmt *mgmt; 674 u8 *pos, qos_info; 675 size_t offset = 0, noffset; 676 int i, count, rates_len, supp_rates_len; 677 u16 capab; 678 struct ieee80211_supported_band *sband; 679 struct ieee80211_chanctx_conf *chanctx_conf; 680 struct ieee80211_channel *chan; 681 u32 rates = 0; 682 683 lockdep_assert_held(&ifmgd->mtx); 684 685 rcu_read_lock(); 686 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 687 if (WARN_ON(!chanctx_conf)) { 688 rcu_read_unlock(); 689 return; 690 } 691 chan = chanctx_conf->def.chan; 692 rcu_read_unlock(); 693 sband = local->hw.wiphy->bands[chan->band]; 694 695 if (assoc_data->supp_rates_len) { 696 /* 697 * Get all rates supported by the device and the AP as 698 * some APs don't like getting a superset of their rates 699 * in the association request (e.g. D-Link DAP 1353 in 700 * b-only mode)... 701 */ 702 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates, 703 assoc_data->supp_rates_len, 704 sband, &rates); 705 } else { 706 /* 707 * In case AP not provide any supported rates information 708 * before association, we send information element(s) with 709 * all rates that we support. 710 */ 711 rates = ~0; 712 rates_len = sband->n_bitrates; 713 } 714 715 skb = alloc_skb(local->hw.extra_tx_headroom + 716 sizeof(*mgmt) + /* bit too much but doesn't matter */ 717 2 + assoc_data->ssid_len + /* SSID */ 718 4 + rates_len + /* (extended) rates */ 719 4 + /* power capability */ 720 2 + 2 * sband->n_channels + /* supported channels */ 721 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 722 2 + sizeof(struct ieee80211_vht_cap) + /* VHT */ 723 assoc_data->ie_len + /* extra IEs */ 724 9, /* WMM */ 725 GFP_KERNEL); 726 if (!skb) 727 return; 728 729 skb_reserve(skb, local->hw.extra_tx_headroom); 730 731 capab = WLAN_CAPABILITY_ESS; 732 733 if (sband->band == IEEE80211_BAND_2GHZ) { 734 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 735 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 736 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 737 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 738 } 739 740 if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) 741 capab |= WLAN_CAPABILITY_PRIVACY; 742 743 if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 744 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 745 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 746 747 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 748 memset(mgmt, 0, 24); 749 memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); 750 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 751 memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); 752 753 if (!is_zero_ether_addr(assoc_data->prev_bssid)) { 754 skb_put(skb, 10); 755 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 756 IEEE80211_STYPE_REASSOC_REQ); 757 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 758 mgmt->u.reassoc_req.listen_interval = 759 cpu_to_le16(local->hw.conf.listen_interval); 760 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, 761 ETH_ALEN); 762 } else { 763 skb_put(skb, 4); 764 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 765 IEEE80211_STYPE_ASSOC_REQ); 766 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 767 mgmt->u.assoc_req.listen_interval = 768 cpu_to_le16(local->hw.conf.listen_interval); 769 } 770 771 /* SSID */ 772 pos = skb_put(skb, 2 + assoc_data->ssid_len); 773 *pos++ = WLAN_EID_SSID; 774 *pos++ = assoc_data->ssid_len; 775 memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); 776 777 /* add all rates which were marked to be used above */ 778 supp_rates_len = rates_len; 779 if (supp_rates_len > 8) 780 supp_rates_len = 8; 781 782 pos = skb_put(skb, supp_rates_len + 2); 783 *pos++ = WLAN_EID_SUPP_RATES; 784 *pos++ = supp_rates_len; 785 786 count = 0; 787 for (i = 0; i < sband->n_bitrates; i++) { 788 if (BIT(i) & rates) { 789 int rate = sband->bitrates[i].bitrate; 790 *pos++ = (u8) (rate / 5); 791 if (++count == 8) 792 break; 793 } 794 } 795 796 if (rates_len > count) { 797 pos = skb_put(skb, rates_len - count + 2); 798 *pos++ = WLAN_EID_EXT_SUPP_RATES; 799 *pos++ = rates_len - count; 800 801 for (i++; i < sband->n_bitrates; i++) { 802 if (BIT(i) & rates) { 803 int rate = sband->bitrates[i].bitrate; 804 *pos++ = (u8) (rate / 5); 805 } 806 } 807 } 808 809 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 810 /* 1. power capabilities */ 811 pos = skb_put(skb, 4); 812 *pos++ = WLAN_EID_PWR_CAPABILITY; 813 *pos++ = 2; 814 *pos++ = 0; /* min tx power */ 815 *pos++ = chan->max_power; /* max tx power */ 816 817 /* 2. supported channels */ 818 /* TODO: get this in reg domain format */ 819 pos = skb_put(skb, 2 * sband->n_channels + 2); 820 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 821 *pos++ = 2 * sband->n_channels; 822 for (i = 0; i < sband->n_channels; i++) { 823 *pos++ = ieee80211_frequency_to_channel( 824 sband->channels[i].center_freq); 825 *pos++ = 1; /* one channel in the subband*/ 826 } 827 } 828 829 /* if present, add any custom IEs that go before HT */ 830 if (assoc_data->ie_len && assoc_data->ie) { 831 static const u8 before_ht[] = { 832 WLAN_EID_SSID, 833 WLAN_EID_SUPP_RATES, 834 WLAN_EID_EXT_SUPP_RATES, 835 WLAN_EID_PWR_CAPABILITY, 836 WLAN_EID_SUPPORTED_CHANNELS, 837 WLAN_EID_RSN, 838 WLAN_EID_QOS_CAPA, 839 WLAN_EID_RRM_ENABLED_CAPABILITIES, 840 WLAN_EID_MOBILITY_DOMAIN, 841 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 842 }; 843 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, 844 before_ht, ARRAY_SIZE(before_ht), 845 offset); 846 pos = skb_put(skb, noffset - offset); 847 memcpy(pos, assoc_data->ie + offset, noffset - offset); 848 offset = noffset; 849 } 850 851 if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 852 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) 853 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 854 855 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) 856 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, 857 sband, chan, sdata->smps_mode); 858 859 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) 860 ieee80211_add_vht_ie(sdata, skb, sband, 861 &assoc_data->ap_vht_cap); 862 863 /* if present, add any custom non-vendor IEs that go after HT */ 864 if (assoc_data->ie_len && assoc_data->ie) { 865 noffset = ieee80211_ie_split_vendor(assoc_data->ie, 866 assoc_data->ie_len, 867 offset); 868 pos = skb_put(skb, noffset - offset); 869 memcpy(pos, assoc_data->ie + offset, noffset - offset); 870 offset = noffset; 871 } 872 873 if (assoc_data->wmm) { 874 if (assoc_data->uapsd) { 875 qos_info = ifmgd->uapsd_queues; 876 qos_info |= (ifmgd->uapsd_max_sp_len << 877 IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); 878 } else { 879 qos_info = 0; 880 } 881 882 pos = skb_put(skb, 9); 883 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 884 *pos++ = 7; /* len */ 885 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 886 *pos++ = 0x50; 887 *pos++ = 0xf2; 888 *pos++ = 2; /* WME */ 889 *pos++ = 0; /* WME info */ 890 *pos++ = 1; /* WME ver */ 891 *pos++ = qos_info; 892 } 893 894 /* add any remaining custom (i.e. vendor specific here) IEs */ 895 if (assoc_data->ie_len && assoc_data->ie) { 896 noffset = assoc_data->ie_len; 897 pos = skb_put(skb, noffset - offset); 898 memcpy(pos, assoc_data->ie + offset, noffset - offset); 899 } 900 901 drv_mgd_prepare_tx(local, sdata); 902 903 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 904 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 905 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | 906 IEEE80211_TX_INTFL_MLME_CONN_TX; 907 ieee80211_tx_skb(sdata, skb); 908 } 909 910 void ieee80211_send_pspoll(struct ieee80211_local *local, 911 struct ieee80211_sub_if_data *sdata) 912 { 913 struct ieee80211_pspoll *pspoll; 914 struct sk_buff *skb; 915 916 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); 917 if (!skb) 918 return; 919 920 pspoll = (struct ieee80211_pspoll *) skb->data; 921 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 922 923 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 924 ieee80211_tx_skb(sdata, skb); 925 } 926 927 void ieee80211_send_nullfunc(struct ieee80211_local *local, 928 struct ieee80211_sub_if_data *sdata, 929 int powersave) 930 { 931 struct sk_buff *skb; 932 struct ieee80211_hdr_3addr *nullfunc; 933 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 934 935 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); 936 if (!skb) 937 return; 938 939 nullfunc = (struct ieee80211_hdr_3addr *) skb->data; 940 if (powersave) 941 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 942 943 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 944 IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 945 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 946 IEEE80211_STA_CONNECTION_POLL)) 947 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; 948 949 ieee80211_tx_skb(sdata, skb); 950 } 951 952 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, 953 struct ieee80211_sub_if_data *sdata) 954 { 955 struct sk_buff *skb; 956 struct ieee80211_hdr *nullfunc; 957 __le16 fc; 958 959 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 960 return; 961 962 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); 963 if (!skb) 964 return; 965 966 skb_reserve(skb, local->hw.extra_tx_headroom); 967 968 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); 969 memset(nullfunc, 0, 30); 970 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 971 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 972 nullfunc->frame_control = fc; 973 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); 974 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); 975 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); 976 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); 977 978 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 979 ieee80211_tx_skb(sdata, skb); 980 } 981 982 /* spectrum management related things */ 983 static void ieee80211_chswitch_work(struct work_struct *work) 984 { 985 struct ieee80211_sub_if_data *sdata = 986 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); 987 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 988 989 if (!ieee80211_sdata_running(sdata)) 990 return; 991 992 mutex_lock(&ifmgd->mtx); 993 if (!ifmgd->associated) 994 goto out; 995 996 sdata->local->_oper_channel = sdata->local->csa_channel; 997 if (!sdata->local->ops->channel_switch) { 998 /* call "hw_config" only if doing sw channel switch */ 999 ieee80211_hw_config(sdata->local, 1000 IEEE80211_CONF_CHANGE_CHANNEL); 1001 } else { 1002 /* update the device channel directly */ 1003 sdata->local->hw.conf.channel = sdata->local->_oper_channel; 1004 } 1005 1006 /* XXX: shouldn't really modify cfg80211-owned data! */ 1007 ifmgd->associated->channel = sdata->local->_oper_channel; 1008 1009 /* XXX: wait for a beacon first? */ 1010 ieee80211_wake_queues_by_reason(&sdata->local->hw, 1011 IEEE80211_QUEUE_STOP_REASON_CSA); 1012 out: 1013 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 1014 mutex_unlock(&ifmgd->mtx); 1015 } 1016 1017 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) 1018 { 1019 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1020 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1021 1022 trace_api_chswitch_done(sdata, success); 1023 if (!success) { 1024 sdata_info(sdata, 1025 "driver channel switch failed, disconnecting\n"); 1026 ieee80211_queue_work(&sdata->local->hw, 1027 &ifmgd->csa_connection_drop_work); 1028 } else { 1029 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1030 } 1031 } 1032 EXPORT_SYMBOL(ieee80211_chswitch_done); 1033 1034 static void ieee80211_chswitch_timer(unsigned long data) 1035 { 1036 struct ieee80211_sub_if_data *sdata = 1037 (struct ieee80211_sub_if_data *) data; 1038 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1039 1040 if (sdata->local->quiescing) { 1041 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 1042 return; 1043 } 1044 1045 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1046 } 1047 1048 void 1049 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, 1050 const struct ieee80211_channel_sw_ie *sw_elem, 1051 struct ieee80211_bss *bss, u64 timestamp) 1052 { 1053 struct cfg80211_bss *cbss = 1054 container_of((void *)bss, struct cfg80211_bss, priv); 1055 struct ieee80211_channel *new_ch; 1056 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1057 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, 1058 cbss->channel->band); 1059 struct ieee80211_chanctx *chanctx; 1060 1061 ASSERT_MGD_MTX(ifmgd); 1062 1063 if (!ifmgd->associated) 1064 return; 1065 1066 if (sdata->local->scanning) 1067 return; 1068 1069 /* Disregard subsequent beacons if we are already running a timer 1070 processing a CSA */ 1071 1072 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) 1073 return; 1074 1075 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); 1076 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) { 1077 sdata_info(sdata, 1078 "AP %pM switches to unsupported channel (%d MHz), disconnecting\n", 1079 ifmgd->associated->bssid, new_freq); 1080 ieee80211_queue_work(&sdata->local->hw, 1081 &ifmgd->csa_connection_drop_work); 1082 return; 1083 } 1084 1085 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; 1086 1087 if (sdata->local->use_chanctx) { 1088 sdata_info(sdata, 1089 "not handling channel switch with channel contexts\n"); 1090 ieee80211_queue_work(&sdata->local->hw, 1091 &ifmgd->csa_connection_drop_work); 1092 return; 1093 } 1094 1095 mutex_lock(&sdata->local->chanctx_mtx); 1096 if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) { 1097 mutex_unlock(&sdata->local->chanctx_mtx); 1098 return; 1099 } 1100 chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf), 1101 struct ieee80211_chanctx, conf); 1102 if (chanctx->refcount > 1) { 1103 sdata_info(sdata, 1104 "channel switch with multiple interfaces on the same channel, disconnecting\n"); 1105 ieee80211_queue_work(&sdata->local->hw, 1106 &ifmgd->csa_connection_drop_work); 1107 mutex_unlock(&sdata->local->chanctx_mtx); 1108 return; 1109 } 1110 mutex_unlock(&sdata->local->chanctx_mtx); 1111 1112 sdata->local->csa_channel = new_ch; 1113 1114 if (sw_elem->mode) 1115 ieee80211_stop_queues_by_reason(&sdata->local->hw, 1116 IEEE80211_QUEUE_STOP_REASON_CSA); 1117 1118 if (sdata->local->ops->channel_switch) { 1119 /* use driver's channel switch callback */ 1120 struct ieee80211_channel_switch ch_switch = { 1121 .timestamp = timestamp, 1122 .block_tx = sw_elem->mode, 1123 .channel = new_ch, 1124 .count = sw_elem->count, 1125 }; 1126 1127 drv_channel_switch(sdata->local, &ch_switch); 1128 return; 1129 } 1130 1131 /* channel switch handled in software */ 1132 if (sw_elem->count <= 1) 1133 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); 1134 else 1135 mod_timer(&ifmgd->chswitch_timer, 1136 TU_TO_EXP_TIME(sw_elem->count * 1137 cbss->beacon_interval)); 1138 } 1139 1140 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, 1141 struct ieee80211_channel *channel, 1142 const u8 *country_ie, u8 country_ie_len, 1143 const u8 *pwr_constr_elem) 1144 { 1145 struct ieee80211_country_ie_triplet *triplet; 1146 int chan = ieee80211_frequency_to_channel(channel->center_freq); 1147 int i, chan_pwr, chan_increment, new_ap_level; 1148 bool have_chan_pwr = false; 1149 1150 /* Invalid IE */ 1151 if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) 1152 return 0; 1153 1154 triplet = (void *)(country_ie + 3); 1155 country_ie_len -= 3; 1156 1157 switch (channel->band) { 1158 default: 1159 WARN_ON_ONCE(1); 1160 /* fall through */ 1161 case IEEE80211_BAND_2GHZ: 1162 case IEEE80211_BAND_60GHZ: 1163 chan_increment = 1; 1164 break; 1165 case IEEE80211_BAND_5GHZ: 1166 chan_increment = 4; 1167 break; 1168 } 1169 1170 /* find channel */ 1171 while (country_ie_len >= 3) { 1172 u8 first_channel = triplet->chans.first_channel; 1173 1174 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) 1175 goto next; 1176 1177 for (i = 0; i < triplet->chans.num_channels; i++) { 1178 if (first_channel + i * chan_increment == chan) { 1179 have_chan_pwr = true; 1180 chan_pwr = triplet->chans.max_power; 1181 break; 1182 } 1183 } 1184 if (have_chan_pwr) 1185 break; 1186 1187 next: 1188 triplet++; 1189 country_ie_len -= 3; 1190 } 1191 1192 if (!have_chan_pwr) 1193 return 0; 1194 1195 new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem); 1196 1197 if (sdata->ap_power_level == new_ap_level) 1198 return 0; 1199 1200 sdata_info(sdata, 1201 "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", 1202 new_ap_level, chan_pwr, *pwr_constr_elem, 1203 sdata->u.mgd.bssid); 1204 sdata->ap_power_level = new_ap_level; 1205 if (__ieee80211_recalc_txpower(sdata)) 1206 return BSS_CHANGED_TXPOWER; 1207 return 0; 1208 } 1209 1210 /* powersave */ 1211 static void ieee80211_enable_ps(struct ieee80211_local *local, 1212 struct ieee80211_sub_if_data *sdata) 1213 { 1214 struct ieee80211_conf *conf = &local->hw.conf; 1215 1216 /* 1217 * If we are scanning right now then the parameters will 1218 * take effect when scan finishes. 1219 */ 1220 if (local->scanning) 1221 return; 1222 1223 if (conf->dynamic_ps_timeout > 0 && 1224 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { 1225 mod_timer(&local->dynamic_ps_timer, jiffies + 1226 msecs_to_jiffies(conf->dynamic_ps_timeout)); 1227 } else { 1228 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1229 ieee80211_send_nullfunc(local, sdata, 1); 1230 1231 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1232 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 1233 return; 1234 1235 conf->flags |= IEEE80211_CONF_PS; 1236 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1237 } 1238 } 1239 1240 static void ieee80211_change_ps(struct ieee80211_local *local) 1241 { 1242 struct ieee80211_conf *conf = &local->hw.conf; 1243 1244 if (local->ps_sdata) { 1245 ieee80211_enable_ps(local, local->ps_sdata); 1246 } else if (conf->flags & IEEE80211_CONF_PS) { 1247 conf->flags &= ~IEEE80211_CONF_PS; 1248 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1249 del_timer_sync(&local->dynamic_ps_timer); 1250 cancel_work_sync(&local->dynamic_ps_enable_work); 1251 } 1252 } 1253 1254 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) 1255 { 1256 struct ieee80211_if_managed *mgd = &sdata->u.mgd; 1257 struct sta_info *sta = NULL; 1258 bool authorized = false; 1259 1260 if (!mgd->powersave) 1261 return false; 1262 1263 if (mgd->broken_ap) 1264 return false; 1265 1266 if (!mgd->associated) 1267 return false; 1268 1269 if (mgd->flags & (IEEE80211_STA_BEACON_POLL | 1270 IEEE80211_STA_CONNECTION_POLL)) 1271 return false; 1272 1273 rcu_read_lock(); 1274 sta = sta_info_get(sdata, mgd->bssid); 1275 if (sta) 1276 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1277 rcu_read_unlock(); 1278 1279 return authorized; 1280 } 1281 1282 /* need to hold RTNL or interface lock */ 1283 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) 1284 { 1285 struct ieee80211_sub_if_data *sdata, *found = NULL; 1286 int count = 0; 1287 int timeout; 1288 1289 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { 1290 local->ps_sdata = NULL; 1291 return; 1292 } 1293 1294 list_for_each_entry(sdata, &local->interfaces, list) { 1295 if (!ieee80211_sdata_running(sdata)) 1296 continue; 1297 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1298 /* If an AP vif is found, then disable PS 1299 * by setting the count to zero thereby setting 1300 * ps_sdata to NULL. 1301 */ 1302 count = 0; 1303 break; 1304 } 1305 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1306 continue; 1307 found = sdata; 1308 count++; 1309 } 1310 1311 if (count == 1 && ieee80211_powersave_allowed(found)) { 1312 s32 beaconint_us; 1313 1314 if (latency < 0) 1315 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); 1316 1317 beaconint_us = ieee80211_tu_to_usec( 1318 found->vif.bss_conf.beacon_int); 1319 1320 timeout = local->dynamic_ps_forced_timeout; 1321 if (timeout < 0) { 1322 /* 1323 * Go to full PSM if the user configures a very low 1324 * latency requirement. 1325 * The 2000 second value is there for compatibility 1326 * until the PM_QOS_NETWORK_LATENCY is configured 1327 * with real values. 1328 */ 1329 if (latency > (1900 * USEC_PER_MSEC) && 1330 latency != (2000 * USEC_PER_SEC)) 1331 timeout = 0; 1332 else 1333 timeout = 100; 1334 } 1335 local->hw.conf.dynamic_ps_timeout = timeout; 1336 1337 if (beaconint_us > latency) { 1338 local->ps_sdata = NULL; 1339 } else { 1340 int maxslp = 1; 1341 u8 dtimper = found->u.mgd.dtim_period; 1342 1343 /* If the TIM IE is invalid, pretend the value is 1 */ 1344 if (!dtimper) 1345 dtimper = 1; 1346 else if (dtimper > 1) 1347 maxslp = min_t(int, dtimper, 1348 latency / beaconint_us); 1349 1350 local->hw.conf.max_sleep_period = maxslp; 1351 local->hw.conf.ps_dtim_period = dtimper; 1352 local->ps_sdata = found; 1353 } 1354 } else { 1355 local->ps_sdata = NULL; 1356 } 1357 1358 ieee80211_change_ps(local); 1359 } 1360 1361 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) 1362 { 1363 bool ps_allowed = ieee80211_powersave_allowed(sdata); 1364 1365 if (sdata->vif.bss_conf.ps != ps_allowed) { 1366 sdata->vif.bss_conf.ps = ps_allowed; 1367 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); 1368 } 1369 } 1370 1371 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 1372 { 1373 struct ieee80211_local *local = 1374 container_of(work, struct ieee80211_local, 1375 dynamic_ps_disable_work); 1376 1377 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1378 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1379 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1380 } 1381 1382 ieee80211_wake_queues_by_reason(&local->hw, 1383 IEEE80211_QUEUE_STOP_REASON_PS); 1384 } 1385 1386 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 1387 { 1388 struct ieee80211_local *local = 1389 container_of(work, struct ieee80211_local, 1390 dynamic_ps_enable_work); 1391 struct ieee80211_sub_if_data *sdata = local->ps_sdata; 1392 struct ieee80211_if_managed *ifmgd; 1393 unsigned long flags; 1394 int q; 1395 1396 /* can only happen when PS was just disabled anyway */ 1397 if (!sdata) 1398 return; 1399 1400 ifmgd = &sdata->u.mgd; 1401 1402 if (local->hw.conf.flags & IEEE80211_CONF_PS) 1403 return; 1404 1405 if (local->hw.conf.dynamic_ps_timeout > 0) { 1406 /* don't enter PS if TX frames are pending */ 1407 if (drv_tx_frames_pending(local)) { 1408 mod_timer(&local->dynamic_ps_timer, jiffies + 1409 msecs_to_jiffies( 1410 local->hw.conf.dynamic_ps_timeout)); 1411 return; 1412 } 1413 1414 /* 1415 * transmission can be stopped by others which leads to 1416 * dynamic_ps_timer expiry. Postpone the ps timer if it 1417 * is not the actual idle state. 1418 */ 1419 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1420 for (q = 0; q < local->hw.queues; q++) { 1421 if (local->queue_stop_reasons[q]) { 1422 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1423 flags); 1424 mod_timer(&local->dynamic_ps_timer, jiffies + 1425 msecs_to_jiffies( 1426 local->hw.conf.dynamic_ps_timeout)); 1427 return; 1428 } 1429 } 1430 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1431 } 1432 1433 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && 1434 !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1435 netif_tx_stop_all_queues(sdata->dev); 1436 1437 if (drv_tx_frames_pending(local)) 1438 mod_timer(&local->dynamic_ps_timer, jiffies + 1439 msecs_to_jiffies( 1440 local->hw.conf.dynamic_ps_timeout)); 1441 else { 1442 ieee80211_send_nullfunc(local, sdata, 1); 1443 /* Flush to get the tx status of nullfunc frame */ 1444 drv_flush(local, false); 1445 } 1446 } 1447 1448 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 1449 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || 1450 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { 1451 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 1452 local->hw.conf.flags |= IEEE80211_CONF_PS; 1453 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1454 } 1455 1456 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) 1457 netif_tx_wake_all_queues(sdata->dev); 1458 } 1459 1460 void ieee80211_dynamic_ps_timer(unsigned long data) 1461 { 1462 struct ieee80211_local *local = (void *) data; 1463 1464 if (local->quiescing || local->suspended) 1465 return; 1466 1467 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); 1468 } 1469 1470 void ieee80211_dfs_cac_timer_work(struct work_struct *work) 1471 { 1472 struct delayed_work *delayed_work = 1473 container_of(work, struct delayed_work, work); 1474 struct ieee80211_sub_if_data *sdata = 1475 container_of(delayed_work, struct ieee80211_sub_if_data, 1476 dfs_cac_timer_work); 1477 1478 ieee80211_vif_release_channel(sdata); 1479 1480 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL); 1481 } 1482 1483 /* MLME */ 1484 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, 1485 struct ieee80211_sub_if_data *sdata, 1486 const u8 *wmm_param, size_t wmm_param_len) 1487 { 1488 struct ieee80211_tx_queue_params params; 1489 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1490 size_t left; 1491 int count; 1492 const u8 *pos; 1493 u8 uapsd_queues = 0; 1494 1495 if (!local->ops->conf_tx) 1496 return false; 1497 1498 if (local->hw.queues < IEEE80211_NUM_ACS) 1499 return false; 1500 1501 if (!wmm_param) 1502 return false; 1503 1504 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 1505 return false; 1506 1507 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 1508 uapsd_queues = ifmgd->uapsd_queues; 1509 1510 count = wmm_param[6] & 0x0f; 1511 if (count == ifmgd->wmm_last_param_set) 1512 return false; 1513 ifmgd->wmm_last_param_set = count; 1514 1515 pos = wmm_param + 8; 1516 left = wmm_param_len - 8; 1517 1518 memset(¶ms, 0, sizeof(params)); 1519 1520 sdata->wmm_acm = 0; 1521 for (; left >= 4; left -= 4, pos += 4) { 1522 int aci = (pos[0] >> 5) & 0x03; 1523 int acm = (pos[0] >> 4) & 0x01; 1524 bool uapsd = false; 1525 int queue; 1526 1527 switch (aci) { 1528 case 1: /* AC_BK */ 1529 queue = 3; 1530 if (acm) 1531 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ 1532 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) 1533 uapsd = true; 1534 break; 1535 case 2: /* AC_VI */ 1536 queue = 1; 1537 if (acm) 1538 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ 1539 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) 1540 uapsd = true; 1541 break; 1542 case 3: /* AC_VO */ 1543 queue = 0; 1544 if (acm) 1545 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ 1546 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 1547 uapsd = true; 1548 break; 1549 case 0: /* AC_BE */ 1550 default: 1551 queue = 2; 1552 if (acm) 1553 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 1554 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) 1555 uapsd = true; 1556 break; 1557 } 1558 1559 params.aifs = pos[0] & 0x0f; 1560 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 1561 params.cw_min = ecw2cw(pos[1] & 0x0f); 1562 params.txop = get_unaligned_le16(pos + 2); 1563 params.uapsd = uapsd; 1564 1565 mlme_dbg(sdata, 1566 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n", 1567 queue, aci, acm, 1568 params.aifs, params.cw_min, params.cw_max, 1569 params.txop, params.uapsd); 1570 sdata->tx_conf[queue] = params; 1571 if (drv_conf_tx(local, sdata, queue, ¶ms)) 1572 sdata_err(sdata, 1573 "failed to set TX queue parameters for queue %d\n", 1574 queue); 1575 } 1576 1577 /* enable WMM or activate new settings */ 1578 sdata->vif.bss_conf.qos = true; 1579 return true; 1580 } 1581 1582 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1583 { 1584 lockdep_assert_held(&sdata->local->mtx); 1585 1586 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | 1587 IEEE80211_STA_BEACON_POLL); 1588 ieee80211_run_deferred_scan(sdata->local); 1589 } 1590 1591 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) 1592 { 1593 mutex_lock(&sdata->local->mtx); 1594 __ieee80211_stop_poll(sdata); 1595 mutex_unlock(&sdata->local->mtx); 1596 } 1597 1598 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 1599 u16 capab, bool erp_valid, u8 erp) 1600 { 1601 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1602 u32 changed = 0; 1603 bool use_protection; 1604 bool use_short_preamble; 1605 bool use_short_slot; 1606 1607 if (erp_valid) { 1608 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 1609 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 1610 } else { 1611 use_protection = false; 1612 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 1613 } 1614 1615 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 1616 if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) 1617 use_short_slot = true; 1618 1619 if (use_protection != bss_conf->use_cts_prot) { 1620 bss_conf->use_cts_prot = use_protection; 1621 changed |= BSS_CHANGED_ERP_CTS_PROT; 1622 } 1623 1624 if (use_short_preamble != bss_conf->use_short_preamble) { 1625 bss_conf->use_short_preamble = use_short_preamble; 1626 changed |= BSS_CHANGED_ERP_PREAMBLE; 1627 } 1628 1629 if (use_short_slot != bss_conf->use_short_slot) { 1630 bss_conf->use_short_slot = use_short_slot; 1631 changed |= BSS_CHANGED_ERP_SLOT; 1632 } 1633 1634 return changed; 1635 } 1636 1637 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 1638 struct cfg80211_bss *cbss, 1639 u32 bss_info_changed) 1640 { 1641 struct ieee80211_bss *bss = (void *)cbss->priv; 1642 struct ieee80211_local *local = sdata->local; 1643 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1644 1645 bss_info_changed |= BSS_CHANGED_ASSOC; 1646 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 1647 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); 1648 1649 sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( 1650 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); 1651 1652 sdata->u.mgd.associated = cbss; 1653 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); 1654 1655 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; 1656 1657 if (sdata->vif.p2p) { 1658 const struct cfg80211_bss_ies *ies; 1659 1660 rcu_read_lock(); 1661 ies = rcu_dereference(cbss->ies); 1662 if (ies) { 1663 u8 noa[2]; 1664 int ret; 1665 1666 ret = cfg80211_get_p2p_attr( 1667 ies->data, ies->len, 1668 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 1669 noa, sizeof(noa)); 1670 if (ret >= 2) { 1671 bss_conf->p2p_oppps = noa[1] & 0x80; 1672 bss_conf->p2p_ctwindow = noa[1] & 0x7f; 1673 bss_info_changed |= BSS_CHANGED_P2P_PS; 1674 sdata->u.mgd.p2p_noa_index = noa[0]; 1675 } 1676 } 1677 rcu_read_unlock(); 1678 } 1679 1680 /* just to be sure */ 1681 ieee80211_stop_poll(sdata); 1682 1683 ieee80211_led_assoc(local, 1); 1684 1685 if (sdata->u.mgd.assoc_data->have_beacon) { 1686 /* 1687 * If the AP is buggy we may get here with no DTIM period 1688 * known, so assume it's 1 which is the only safe assumption 1689 * in that case, although if the TIM IE is broken powersave 1690 * probably just won't work at all. 1691 */ 1692 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; 1693 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD; 1694 } else { 1695 bss_conf->dtim_period = 0; 1696 } 1697 1698 bss_conf->assoc = 1; 1699 1700 /* Tell the driver to monitor connection quality (if supported) */ 1701 if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && 1702 bss_conf->cqm_rssi_thold) 1703 bss_info_changed |= BSS_CHANGED_CQM; 1704 1705 /* Enable ARP filtering */ 1706 if (bss_conf->arp_addr_cnt) 1707 bss_info_changed |= BSS_CHANGED_ARP_FILTER; 1708 1709 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 1710 1711 mutex_lock(&local->iflist_mtx); 1712 ieee80211_recalc_ps(local, -1); 1713 mutex_unlock(&local->iflist_mtx); 1714 1715 ieee80211_recalc_smps(sdata); 1716 ieee80211_recalc_ps_vif(sdata); 1717 1718 netif_tx_start_all_queues(sdata->dev); 1719 netif_carrier_on(sdata->dev); 1720 } 1721 1722 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 1723 u16 stype, u16 reason, bool tx, 1724 u8 *frame_buf) 1725 { 1726 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1727 struct ieee80211_local *local = sdata->local; 1728 u32 changed = 0; 1729 1730 ASSERT_MGD_MTX(ifmgd); 1731 1732 if (WARN_ON_ONCE(tx && !frame_buf)) 1733 return; 1734 1735 if (WARN_ON(!ifmgd->associated)) 1736 return; 1737 1738 ieee80211_stop_poll(sdata); 1739 1740 ifmgd->associated = NULL; 1741 1742 /* 1743 * we need to commit the associated = NULL change because the 1744 * scan code uses that to determine whether this iface should 1745 * go to/wake up from powersave or not -- and could otherwise 1746 * wake the queues erroneously. 1747 */ 1748 smp_mb(); 1749 1750 /* 1751 * Thus, we can only afterwards stop the queues -- to account 1752 * for the case where another CPU is finishing a scan at this 1753 * time -- we don't want the scan code to enable queues. 1754 */ 1755 1756 netif_tx_stop_all_queues(sdata->dev); 1757 netif_carrier_off(sdata->dev); 1758 1759 /* 1760 * if we want to get out of ps before disassoc (why?) we have 1761 * to do it before sending disassoc, as otherwise the null-packet 1762 * won't be valid. 1763 */ 1764 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 1765 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 1766 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 1767 } 1768 local->ps_sdata = NULL; 1769 1770 /* disable per-vif ps */ 1771 ieee80211_recalc_ps_vif(sdata); 1772 1773 /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */ 1774 if (tx) 1775 drv_flush(local, false); 1776 1777 /* deauthenticate/disassociate now */ 1778 if (tx || frame_buf) 1779 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, 1780 reason, tx, frame_buf); 1781 1782 /* flush out frame */ 1783 if (tx) 1784 drv_flush(local, false); 1785 1786 /* clear bssid only after building the needed mgmt frames */ 1787 memset(ifmgd->bssid, 0, ETH_ALEN); 1788 1789 /* remove AP and TDLS peers */ 1790 sta_info_flush_defer(sdata); 1791 1792 /* finally reset all BSS / config parameters */ 1793 changed |= ieee80211_reset_erp_info(sdata); 1794 1795 ieee80211_led_assoc(local, 0); 1796 changed |= BSS_CHANGED_ASSOC; 1797 sdata->vif.bss_conf.assoc = false; 1798 1799 sdata->vif.bss_conf.p2p_ctwindow = 0; 1800 sdata->vif.bss_conf.p2p_oppps = false; 1801 1802 /* on the next assoc, re-program HT parameters */ 1803 memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); 1804 memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); 1805 1806 sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; 1807 1808 del_timer_sync(&local->dynamic_ps_timer); 1809 cancel_work_sync(&local->dynamic_ps_enable_work); 1810 1811 /* Disable ARP filtering */ 1812 if (sdata->vif.bss_conf.arp_addr_cnt) 1813 changed |= BSS_CHANGED_ARP_FILTER; 1814 1815 sdata->vif.bss_conf.qos = false; 1816 changed |= BSS_CHANGED_QOS; 1817 1818 /* The BSSID (not really interesting) and HT changed */ 1819 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; 1820 ieee80211_bss_info_change_notify(sdata, changed); 1821 1822 /* disassociated - set to defaults now */ 1823 ieee80211_set_wmm_default(sdata, false); 1824 1825 del_timer_sync(&sdata->u.mgd.conn_mon_timer); 1826 del_timer_sync(&sdata->u.mgd.bcn_mon_timer); 1827 del_timer_sync(&sdata->u.mgd.timer); 1828 del_timer_sync(&sdata->u.mgd.chswitch_timer); 1829 1830 sdata->u.mgd.timers_running = 0; 1831 1832 sdata->vif.bss_conf.dtim_period = 0; 1833 1834 ifmgd->flags = 0; 1835 ieee80211_vif_release_channel(sdata); 1836 } 1837 1838 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 1839 struct ieee80211_hdr *hdr) 1840 { 1841 /* 1842 * We can postpone the mgd.timer whenever receiving unicast frames 1843 * from AP because we know that the connection is working both ways 1844 * at that time. But multicast frames (and hence also beacons) must 1845 * be ignored here, because we need to trigger the timer during 1846 * data idle periods for sending the periodic probe request to the 1847 * AP we're connected to. 1848 */ 1849 if (is_multicast_ether_addr(hdr->addr1)) 1850 return; 1851 1852 ieee80211_sta_reset_conn_monitor(sdata); 1853 } 1854 1855 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) 1856 { 1857 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1858 struct ieee80211_local *local = sdata->local; 1859 1860 mutex_lock(&local->mtx); 1861 if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1862 IEEE80211_STA_CONNECTION_POLL))) { 1863 mutex_unlock(&local->mtx); 1864 return; 1865 } 1866 1867 __ieee80211_stop_poll(sdata); 1868 1869 mutex_lock(&local->iflist_mtx); 1870 ieee80211_recalc_ps(local, -1); 1871 mutex_unlock(&local->iflist_mtx); 1872 1873 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) 1874 goto out; 1875 1876 /* 1877 * We've received a probe response, but are not sure whether 1878 * we have or will be receiving any beacons or data, so let's 1879 * schedule the timers again, just in case. 1880 */ 1881 ieee80211_sta_reset_beacon_monitor(sdata); 1882 1883 mod_timer(&ifmgd->conn_mon_timer, 1884 round_jiffies_up(jiffies + 1885 IEEE80211_CONNECTION_IDLE_TIME)); 1886 out: 1887 mutex_unlock(&local->mtx); 1888 } 1889 1890 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, 1891 struct ieee80211_hdr *hdr, bool ack) 1892 { 1893 if (!ieee80211_is_data(hdr->frame_control)) 1894 return; 1895 1896 if (ieee80211_is_nullfunc(hdr->frame_control) && 1897 sdata->u.mgd.probe_send_count > 0) { 1898 if (ack) 1899 ieee80211_sta_reset_conn_monitor(sdata); 1900 else 1901 sdata->u.mgd.nullfunc_failed = true; 1902 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 1903 return; 1904 } 1905 1906 if (ack) 1907 ieee80211_sta_reset_conn_monitor(sdata); 1908 } 1909 1910 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) 1911 { 1912 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1913 const u8 *ssid; 1914 u8 *dst = ifmgd->associated->bssid; 1915 u8 unicast_limit = max(1, max_probe_tries - 3); 1916 1917 /* 1918 * Try sending broadcast probe requests for the last three 1919 * probe requests after the first ones failed since some 1920 * buggy APs only support broadcast probe requests. 1921 */ 1922 if (ifmgd->probe_send_count >= unicast_limit) 1923 dst = NULL; 1924 1925 /* 1926 * When the hardware reports an accurate Tx ACK status, it's 1927 * better to send a nullfunc frame instead of a probe request, 1928 * as it will kick us off the AP quickly if we aren't associated 1929 * anymore. The timeout will be reset if the frame is ACKed by 1930 * the AP. 1931 */ 1932 ifmgd->probe_send_count++; 1933 1934 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 1935 ifmgd->nullfunc_failed = false; 1936 ieee80211_send_nullfunc(sdata->local, sdata, 0); 1937 } else { 1938 int ssid_len; 1939 1940 rcu_read_lock(); 1941 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); 1942 if (WARN_ON_ONCE(ssid == NULL)) 1943 ssid_len = 0; 1944 else 1945 ssid_len = ssid[1]; 1946 1947 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL, 1948 0, (u32) -1, true, 0, 1949 ifmgd->associated->channel, false); 1950 rcu_read_unlock(); 1951 } 1952 1953 ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); 1954 run_again(ifmgd, ifmgd->probe_timeout); 1955 if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 1956 drv_flush(sdata->local, false); 1957 } 1958 1959 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, 1960 bool beacon) 1961 { 1962 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 1963 bool already = false; 1964 1965 if (!ieee80211_sdata_running(sdata)) 1966 return; 1967 1968 mutex_lock(&ifmgd->mtx); 1969 1970 if (!ifmgd->associated) 1971 goto out; 1972 1973 mutex_lock(&sdata->local->mtx); 1974 1975 if (sdata->local->tmp_channel || sdata->local->scanning) { 1976 mutex_unlock(&sdata->local->mtx); 1977 goto out; 1978 } 1979 1980 if (beacon) 1981 mlme_dbg_ratelimited(sdata, 1982 "detected beacon loss from AP - probing\n"); 1983 1984 ieee80211_cqm_rssi_notify(&sdata->vif, 1985 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL); 1986 1987 /* 1988 * The driver/our work has already reported this event or the 1989 * connection monitoring has kicked in and we have already sent 1990 * a probe request. Or maybe the AP died and the driver keeps 1991 * reporting until we disassociate... 1992 * 1993 * In either case we have to ignore the current call to this 1994 * function (except for setting the correct probe reason bit) 1995 * because otherwise we would reset the timer every time and 1996 * never check whether we received a probe response! 1997 */ 1998 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 1999 IEEE80211_STA_CONNECTION_POLL)) 2000 already = true; 2001 2002 if (beacon) 2003 ifmgd->flags |= IEEE80211_STA_BEACON_POLL; 2004 else 2005 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; 2006 2007 mutex_unlock(&sdata->local->mtx); 2008 2009 if (already) 2010 goto out; 2011 2012 mutex_lock(&sdata->local->iflist_mtx); 2013 ieee80211_recalc_ps(sdata->local, -1); 2014 mutex_unlock(&sdata->local->iflist_mtx); 2015 2016 ifmgd->probe_send_count = 0; 2017 ieee80211_mgd_probe_ap_send(sdata); 2018 out: 2019 mutex_unlock(&ifmgd->mtx); 2020 } 2021 2022 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, 2023 struct ieee80211_vif *vif) 2024 { 2025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2026 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2027 struct cfg80211_bss *cbss; 2028 struct sk_buff *skb; 2029 const u8 *ssid; 2030 int ssid_len; 2031 2032 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2033 return NULL; 2034 2035 ASSERT_MGD_MTX(ifmgd); 2036 2037 if (ifmgd->associated) 2038 cbss = ifmgd->associated; 2039 else if (ifmgd->auth_data) 2040 cbss = ifmgd->auth_data->bss; 2041 else if (ifmgd->assoc_data) 2042 cbss = ifmgd->assoc_data->bss; 2043 else 2044 return NULL; 2045 2046 rcu_read_lock(); 2047 ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); 2048 if (WARN_ON_ONCE(ssid == NULL)) 2049 ssid_len = 0; 2050 else 2051 ssid_len = ssid[1]; 2052 2053 skb = ieee80211_build_probe_req(sdata, cbss->bssid, 2054 (u32) -1, cbss->channel, 2055 ssid + 2, ssid_len, 2056 NULL, 0, true); 2057 rcu_read_unlock(); 2058 2059 return skb; 2060 } 2061 EXPORT_SYMBOL(ieee80211_ap_probereq_get); 2062 2063 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) 2064 { 2065 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2066 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 2067 2068 mutex_lock(&ifmgd->mtx); 2069 if (!ifmgd->associated) { 2070 mutex_unlock(&ifmgd->mtx); 2071 return; 2072 } 2073 2074 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 2075 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 2076 true, frame_buf); 2077 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; 2078 ieee80211_wake_queues_by_reason(&sdata->local->hw, 2079 IEEE80211_QUEUE_STOP_REASON_CSA); 2080 mutex_unlock(&ifmgd->mtx); 2081 2082 /* 2083 * must be outside lock due to cfg80211, 2084 * but that's not a problem. 2085 */ 2086 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN); 2087 } 2088 2089 static void ieee80211_beacon_connection_loss_work(struct work_struct *work) 2090 { 2091 struct ieee80211_sub_if_data *sdata = 2092 container_of(work, struct ieee80211_sub_if_data, 2093 u.mgd.beacon_connection_loss_work); 2094 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2095 struct sta_info *sta; 2096 2097 if (ifmgd->associated) { 2098 rcu_read_lock(); 2099 sta = sta_info_get(sdata, ifmgd->bssid); 2100 if (sta) 2101 sta->beacon_loss_count++; 2102 rcu_read_unlock(); 2103 } 2104 2105 if (ifmgd->connection_loss) { 2106 sdata_info(sdata, "Connection to AP %pM lost\n", 2107 ifmgd->bssid); 2108 __ieee80211_disconnect(sdata); 2109 } else { 2110 ieee80211_mgd_probe_ap(sdata, true); 2111 } 2112 } 2113 2114 static void ieee80211_csa_connection_drop_work(struct work_struct *work) 2115 { 2116 struct ieee80211_sub_if_data *sdata = 2117 container_of(work, struct ieee80211_sub_if_data, 2118 u.mgd.csa_connection_drop_work); 2119 2120 __ieee80211_disconnect(sdata); 2121 } 2122 2123 void ieee80211_beacon_loss(struct ieee80211_vif *vif) 2124 { 2125 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2126 struct ieee80211_hw *hw = &sdata->local->hw; 2127 2128 trace_api_beacon_loss(sdata); 2129 2130 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); 2131 sdata->u.mgd.connection_loss = false; 2132 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2133 } 2134 EXPORT_SYMBOL(ieee80211_beacon_loss); 2135 2136 void ieee80211_connection_loss(struct ieee80211_vif *vif) 2137 { 2138 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2139 struct ieee80211_hw *hw = &sdata->local->hw; 2140 2141 trace_api_connection_loss(sdata); 2142 2143 sdata->u.mgd.connection_loss = true; 2144 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); 2145 } 2146 EXPORT_SYMBOL(ieee80211_connection_loss); 2147 2148 2149 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, 2150 bool assoc) 2151 { 2152 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2153 2154 lockdep_assert_held(&sdata->u.mgd.mtx); 2155 2156 if (!assoc) { 2157 sta_info_destroy_addr(sdata, auth_data->bss->bssid); 2158 2159 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2160 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2161 sdata->u.mgd.flags = 0; 2162 ieee80211_vif_release_channel(sdata); 2163 } 2164 2165 cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss); 2166 kfree(auth_data); 2167 sdata->u.mgd.auth_data = NULL; 2168 } 2169 2170 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 2171 struct ieee80211_mgmt *mgmt, size_t len) 2172 { 2173 struct ieee80211_local *local = sdata->local; 2174 struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; 2175 u8 *pos; 2176 struct ieee802_11_elems elems; 2177 u32 tx_flags = 0; 2178 2179 pos = mgmt->u.auth.variable; 2180 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2181 if (!elems.challenge) 2182 return; 2183 auth_data->expected_transaction = 4; 2184 drv_mgd_prepare_tx(sdata->local, sdata); 2185 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 2186 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2187 IEEE80211_TX_INTFL_MLME_CONN_TX; 2188 ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 2189 elems.challenge - 2, elems.challenge_len + 2, 2190 auth_data->bss->bssid, auth_data->bss->bssid, 2191 auth_data->key, auth_data->key_len, 2192 auth_data->key_idx, tx_flags); 2193 } 2194 2195 static enum rx_mgmt_action __must_check 2196 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 2197 struct ieee80211_mgmt *mgmt, size_t len) 2198 { 2199 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2200 u8 bssid[ETH_ALEN]; 2201 u16 auth_alg, auth_transaction, status_code; 2202 struct sta_info *sta; 2203 2204 lockdep_assert_held(&ifmgd->mtx); 2205 2206 if (len < 24 + 6) 2207 return RX_MGMT_NONE; 2208 2209 if (!ifmgd->auth_data || ifmgd->auth_data->done) 2210 return RX_MGMT_NONE; 2211 2212 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 2213 2214 if (!ether_addr_equal(bssid, mgmt->bssid)) 2215 return RX_MGMT_NONE; 2216 2217 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 2218 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 2219 status_code = le16_to_cpu(mgmt->u.auth.status_code); 2220 2221 if (auth_alg != ifmgd->auth_data->algorithm || 2222 auth_transaction != ifmgd->auth_data->expected_transaction) { 2223 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n", 2224 mgmt->sa, auth_alg, ifmgd->auth_data->algorithm, 2225 auth_transaction, 2226 ifmgd->auth_data->expected_transaction); 2227 return RX_MGMT_NONE; 2228 } 2229 2230 if (status_code != WLAN_STATUS_SUCCESS) { 2231 sdata_info(sdata, "%pM denied authentication (status %d)\n", 2232 mgmt->sa, status_code); 2233 ieee80211_destroy_auth_data(sdata, false); 2234 return RX_MGMT_CFG80211_RX_AUTH; 2235 } 2236 2237 switch (ifmgd->auth_data->algorithm) { 2238 case WLAN_AUTH_OPEN: 2239 case WLAN_AUTH_LEAP: 2240 case WLAN_AUTH_FT: 2241 case WLAN_AUTH_SAE: 2242 break; 2243 case WLAN_AUTH_SHARED_KEY: 2244 if (ifmgd->auth_data->expected_transaction != 4) { 2245 ieee80211_auth_challenge(sdata, mgmt, len); 2246 /* need another frame */ 2247 return RX_MGMT_NONE; 2248 } 2249 break; 2250 default: 2251 WARN_ONCE(1, "invalid auth alg %d", 2252 ifmgd->auth_data->algorithm); 2253 return RX_MGMT_NONE; 2254 } 2255 2256 sdata_info(sdata, "authenticated\n"); 2257 ifmgd->auth_data->done = true; 2258 ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; 2259 ifmgd->auth_data->timeout_started = true; 2260 run_again(ifmgd, ifmgd->auth_data->timeout); 2261 2262 if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE && 2263 ifmgd->auth_data->expected_transaction != 2) { 2264 /* 2265 * Report auth frame to user space for processing since another 2266 * round of Authentication frames is still needed. 2267 */ 2268 return RX_MGMT_CFG80211_RX_AUTH; 2269 } 2270 2271 /* move station state to auth */ 2272 mutex_lock(&sdata->local->sta_mtx); 2273 sta = sta_info_get(sdata, bssid); 2274 if (!sta) { 2275 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); 2276 goto out_err; 2277 } 2278 if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { 2279 sdata_info(sdata, "failed moving %pM to auth\n", bssid); 2280 goto out_err; 2281 } 2282 mutex_unlock(&sdata->local->sta_mtx); 2283 2284 return RX_MGMT_CFG80211_RX_AUTH; 2285 out_err: 2286 mutex_unlock(&sdata->local->sta_mtx); 2287 /* ignore frame -- wait for timeout */ 2288 return RX_MGMT_NONE; 2289 } 2290 2291 2292 static enum rx_mgmt_action __must_check 2293 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 2294 struct ieee80211_mgmt *mgmt, size_t len) 2295 { 2296 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2297 const u8 *bssid = NULL; 2298 u16 reason_code; 2299 2300 lockdep_assert_held(&ifmgd->mtx); 2301 2302 if (len < 24 + 2) 2303 return RX_MGMT_NONE; 2304 2305 if (!ifmgd->associated || 2306 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2307 return RX_MGMT_NONE; 2308 2309 bssid = ifmgd->associated->bssid; 2310 2311 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 2312 2313 sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n", 2314 bssid, reason_code); 2315 2316 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2317 2318 return RX_MGMT_CFG80211_DEAUTH; 2319 } 2320 2321 2322 static enum rx_mgmt_action __must_check 2323 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 2324 struct ieee80211_mgmt *mgmt, size_t len) 2325 { 2326 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2327 u16 reason_code; 2328 2329 lockdep_assert_held(&ifmgd->mtx); 2330 2331 if (len < 24 + 2) 2332 return RX_MGMT_NONE; 2333 2334 if (!ifmgd->associated || 2335 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2336 return RX_MGMT_NONE; 2337 2338 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 2339 2340 sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", 2341 mgmt->sa, reason_code); 2342 2343 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 2344 2345 return RX_MGMT_CFG80211_DISASSOC; 2346 } 2347 2348 static void ieee80211_get_rates(struct ieee80211_supported_band *sband, 2349 u8 *supp_rates, unsigned int supp_rates_len, 2350 u32 *rates, u32 *basic_rates, 2351 bool *have_higher_than_11mbit, 2352 int *min_rate, int *min_rate_index) 2353 { 2354 int i, j; 2355 2356 for (i = 0; i < supp_rates_len; i++) { 2357 int rate = (supp_rates[i] & 0x7f) * 5; 2358 bool is_basic = !!(supp_rates[i] & 0x80); 2359 2360 if (rate > 110) 2361 *have_higher_than_11mbit = true; 2362 2363 /* 2364 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 2365 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. 2366 * 2367 * Note: Even through the membership selector and the basic 2368 * rate flag share the same bit, they are not exactly 2369 * the same. 2370 */ 2371 if (!!(supp_rates[i] & 0x80) && 2372 (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 2373 continue; 2374 2375 for (j = 0; j < sband->n_bitrates; j++) { 2376 if (sband->bitrates[j].bitrate == rate) { 2377 *rates |= BIT(j); 2378 if (is_basic) 2379 *basic_rates |= BIT(j); 2380 if (rate < *min_rate) { 2381 *min_rate = rate; 2382 *min_rate_index = j; 2383 } 2384 break; 2385 } 2386 } 2387 } 2388 } 2389 2390 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, 2391 bool assoc) 2392 { 2393 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 2394 2395 lockdep_assert_held(&sdata->u.mgd.mtx); 2396 2397 if (!assoc) { 2398 sta_info_destroy_addr(sdata, assoc_data->bss->bssid); 2399 2400 memset(sdata->u.mgd.bssid, 0, ETH_ALEN); 2401 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 2402 sdata->u.mgd.flags = 0; 2403 ieee80211_vif_release_channel(sdata); 2404 } 2405 2406 kfree(assoc_data); 2407 sdata->u.mgd.assoc_data = NULL; 2408 } 2409 2410 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 2411 struct cfg80211_bss *cbss, 2412 struct ieee80211_mgmt *mgmt, size_t len) 2413 { 2414 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2415 struct ieee80211_local *local = sdata->local; 2416 struct ieee80211_supported_band *sband; 2417 struct sta_info *sta; 2418 u8 *pos; 2419 u16 capab_info, aid; 2420 struct ieee802_11_elems elems; 2421 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2422 u32 changed = 0; 2423 int err; 2424 2425 /* AssocResp and ReassocResp have identical structure */ 2426 2427 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2428 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2429 2430 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 2431 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", 2432 aid); 2433 aid &= ~(BIT(15) | BIT(14)); 2434 2435 ifmgd->broken_ap = false; 2436 2437 if (aid == 0 || aid > IEEE80211_MAX_AID) { 2438 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", 2439 aid); 2440 aid = 0; 2441 ifmgd->broken_ap = true; 2442 } 2443 2444 pos = mgmt->u.assoc_resp.variable; 2445 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2446 2447 if (!elems.supp_rates) { 2448 sdata_info(sdata, "no SuppRates element in AssocResp\n"); 2449 return false; 2450 } 2451 2452 ifmgd->aid = aid; 2453 2454 /* 2455 * We previously checked these in the beacon/probe response, so 2456 * they should be present here. This is just a safety net. 2457 */ 2458 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 2459 (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) { 2460 sdata_info(sdata, 2461 "HT AP is missing WMM params or HT capability/operation in AssocResp\n"); 2462 return false; 2463 } 2464 2465 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 2466 (!elems.vht_cap_elem || !elems.vht_operation)) { 2467 sdata_info(sdata, 2468 "VHT AP is missing VHT capability/operation in AssocResp\n"); 2469 return false; 2470 } 2471 2472 mutex_lock(&sdata->local->sta_mtx); 2473 /* 2474 * station info was already allocated and inserted before 2475 * the association and should be available to us 2476 */ 2477 sta = sta_info_get(sdata, cbss->bssid); 2478 if (WARN_ON(!sta)) { 2479 mutex_unlock(&sdata->local->sta_mtx); 2480 return false; 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 return false; 2534 } 2535 2536 mutex_unlock(&sdata->local->sta_mtx); 2537 2538 /* 2539 * Always handle WMM once after association regardless 2540 * of the first value the AP uses. Setting -1 here has 2541 * that effect because the AP values is an unsigned 2542 * 4-bit value. 2543 */ 2544 ifmgd->wmm_last_param_set = -1; 2545 2546 if (elems.wmm_param) 2547 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2548 elems.wmm_param_len); 2549 else 2550 ieee80211_set_wmm_default(sdata, false); 2551 changed |= BSS_CHANGED_QOS; 2552 2553 /* set AID and assoc capability, 2554 * ieee80211_set_associated() will tell the driver */ 2555 bss_conf->aid = aid; 2556 bss_conf->assoc_capability = capab_info; 2557 ieee80211_set_associated(sdata, cbss, changed); 2558 2559 /* 2560 * If we're using 4-addr mode, let the AP know that we're 2561 * doing so, so that it can create the STA VLAN on its side 2562 */ 2563 if (ifmgd->use_4addr) 2564 ieee80211_send_4addr_nullfunc(local, sdata); 2565 2566 /* 2567 * Start timer to probe the connection to the AP now. 2568 * Also start the timer that will detect beacon loss. 2569 */ 2570 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); 2571 ieee80211_sta_reset_beacon_monitor(sdata); 2572 2573 return true; 2574 } 2575 2576 static enum rx_mgmt_action __must_check 2577 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 2578 struct ieee80211_mgmt *mgmt, size_t len, 2579 struct cfg80211_bss **bss) 2580 { 2581 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2582 struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; 2583 u16 capab_info, status_code, aid; 2584 struct ieee802_11_elems elems; 2585 u8 *pos; 2586 bool reassoc; 2587 2588 lockdep_assert_held(&ifmgd->mtx); 2589 2590 if (!assoc_data) 2591 return RX_MGMT_NONE; 2592 if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) 2593 return RX_MGMT_NONE; 2594 2595 /* 2596 * AssocResp and ReassocResp have identical structure, so process both 2597 * of them in this function. 2598 */ 2599 2600 if (len < 24 + 6) 2601 return RX_MGMT_NONE; 2602 2603 reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); 2604 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 2605 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 2606 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 2607 2608 sdata_info(sdata, 2609 "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", 2610 reassoc ? "Rea" : "A", mgmt->sa, 2611 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 2612 2613 pos = mgmt->u.assoc_resp.variable; 2614 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 2615 2616 if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && 2617 elems.timeout_int && elems.timeout_int_len == 5 && 2618 elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) { 2619 u32 tu, ms; 2620 tu = get_unaligned_le32(elems.timeout_int + 1); 2621 ms = tu * 1024 / 1000; 2622 sdata_info(sdata, 2623 "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", 2624 mgmt->sa, tu, ms); 2625 assoc_data->timeout = jiffies + msecs_to_jiffies(ms); 2626 assoc_data->timeout_started = true; 2627 if (ms > IEEE80211_ASSOC_TIMEOUT) 2628 run_again(ifmgd, assoc_data->timeout); 2629 return RX_MGMT_NONE; 2630 } 2631 2632 *bss = assoc_data->bss; 2633 2634 if (status_code != WLAN_STATUS_SUCCESS) { 2635 sdata_info(sdata, "%pM denied association (code=%d)\n", 2636 mgmt->sa, status_code); 2637 ieee80211_destroy_assoc_data(sdata, false); 2638 } else { 2639 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) { 2640 /* oops -- internal error -- send timeout for now */ 2641 ieee80211_destroy_assoc_data(sdata, false); 2642 cfg80211_put_bss(sdata->local->hw.wiphy, *bss); 2643 return RX_MGMT_CFG80211_ASSOC_TIMEOUT; 2644 } 2645 sdata_info(sdata, "associated\n"); 2646 2647 /* 2648 * destroy assoc_data afterwards, as otherwise an idle 2649 * recalc after assoc_data is NULL but before associated 2650 * is set can cause the interface to go idle 2651 */ 2652 ieee80211_destroy_assoc_data(sdata, true); 2653 } 2654 2655 return RX_MGMT_CFG80211_RX_ASSOC; 2656 } 2657 2658 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 2659 struct ieee80211_mgmt *mgmt, size_t len, 2660 struct ieee80211_rx_status *rx_status, 2661 struct ieee802_11_elems *elems) 2662 { 2663 struct ieee80211_local *local = sdata->local; 2664 int freq; 2665 struct ieee80211_bss *bss; 2666 struct ieee80211_channel *channel; 2667 bool need_ps = false; 2668 2669 if ((sdata->u.mgd.associated && 2670 ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) || 2671 (sdata->u.mgd.assoc_data && 2672 ether_addr_equal(mgmt->bssid, 2673 sdata->u.mgd.assoc_data->bss->bssid))) { 2674 /* not previously set so we may need to recalc */ 2675 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period; 2676 2677 if (elems->tim && !elems->parse_error) { 2678 const struct ieee80211_tim_ie *tim_ie = elems->tim; 2679 sdata->u.mgd.dtim_period = tim_ie->dtim_period; 2680 } 2681 } 2682 2683 if (elems->ds_params && elems->ds_params_len == 1) 2684 freq = ieee80211_channel_to_frequency(elems->ds_params[0], 2685 rx_status->band); 2686 else 2687 freq = rx_status->freq; 2688 2689 channel = ieee80211_get_channel(local->hw.wiphy, freq); 2690 2691 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 2692 return; 2693 2694 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 2695 channel); 2696 if (bss) 2697 ieee80211_rx_bss_put(local, bss); 2698 2699 if (!sdata->u.mgd.associated) 2700 return; 2701 2702 if (need_ps) { 2703 mutex_lock(&local->iflist_mtx); 2704 ieee80211_recalc_ps(local, -1); 2705 mutex_unlock(&local->iflist_mtx); 2706 } 2707 2708 if (elems->ch_switch_ie && 2709 memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0) 2710 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie, 2711 bss, rx_status->mactime); 2712 } 2713 2714 2715 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 2716 struct sk_buff *skb) 2717 { 2718 struct ieee80211_mgmt *mgmt = (void *)skb->data; 2719 struct ieee80211_if_managed *ifmgd; 2720 struct ieee80211_rx_status *rx_status = (void *) skb->cb; 2721 size_t baselen, len = skb->len; 2722 struct ieee802_11_elems elems; 2723 2724 ifmgd = &sdata->u.mgd; 2725 2726 ASSERT_MGD_MTX(ifmgd); 2727 2728 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) 2729 return; /* ignore ProbeResp to foreign address */ 2730 2731 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 2732 if (baselen > len) 2733 return; 2734 2735 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 2736 &elems); 2737 2738 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2739 2740 if (ifmgd->associated && 2741 ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2742 ieee80211_reset_ap_probe(sdata); 2743 2744 if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && 2745 ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { 2746 /* got probe response, continue with auth */ 2747 sdata_info(sdata, "direct probe responded\n"); 2748 ifmgd->auth_data->tries = 0; 2749 ifmgd->auth_data->timeout = jiffies; 2750 ifmgd->auth_data->timeout_started = true; 2751 run_again(ifmgd, ifmgd->auth_data->timeout); 2752 } 2753 } 2754 2755 /* 2756 * This is the canonical list of information elements we care about, 2757 * the filter code also gives us all changes to the Microsoft OUI 2758 * (00:50:F2) vendor IE which is used for WMM which we need to track. 2759 * 2760 * We implement beacon filtering in software since that means we can 2761 * avoid processing the frame here and in cfg80211, and userspace 2762 * will not be able to tell whether the hardware supports it or not. 2763 * 2764 * XXX: This list needs to be dynamic -- userspace needs to be able to 2765 * add items it requires. It also needs to be able to tell us to 2766 * look out for other vendor IEs. 2767 */ 2768 static const u64 care_about_ies = 2769 (1ULL << WLAN_EID_COUNTRY) | 2770 (1ULL << WLAN_EID_ERP_INFO) | 2771 (1ULL << WLAN_EID_CHANNEL_SWITCH) | 2772 (1ULL << WLAN_EID_PWR_CONSTRAINT) | 2773 (1ULL << WLAN_EID_HT_CAPABILITY) | 2774 (1ULL << WLAN_EID_HT_OPERATION); 2775 2776 static enum rx_mgmt_action 2777 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 2778 struct ieee80211_mgmt *mgmt, size_t len, 2779 u8 *deauth_buf, struct ieee80211_rx_status *rx_status) 2780 { 2781 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2782 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 2783 size_t baselen; 2784 struct ieee802_11_elems elems; 2785 struct ieee80211_local *local = sdata->local; 2786 struct ieee80211_chanctx_conf *chanctx_conf; 2787 struct ieee80211_channel *chan; 2788 struct sta_info *sta; 2789 u32 changed = 0; 2790 bool erp_valid; 2791 u8 erp_value = 0; 2792 u32 ncrc; 2793 u8 *bssid; 2794 2795 lockdep_assert_held(&ifmgd->mtx); 2796 2797 /* Process beacon from the current BSS */ 2798 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 2799 if (baselen > len) 2800 return RX_MGMT_NONE; 2801 2802 rcu_read_lock(); 2803 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2804 if (!chanctx_conf) { 2805 rcu_read_unlock(); 2806 return RX_MGMT_NONE; 2807 } 2808 2809 if (rx_status->freq != chanctx_conf->def.chan->center_freq) { 2810 rcu_read_unlock(); 2811 return RX_MGMT_NONE; 2812 } 2813 chan = chanctx_conf->def.chan; 2814 rcu_read_unlock(); 2815 2816 if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon && 2817 ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { 2818 ieee802_11_parse_elems(mgmt->u.beacon.variable, 2819 len - baselen, &elems); 2820 2821 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2822 ifmgd->assoc_data->have_beacon = true; 2823 ifmgd->assoc_data->need_beacon = false; 2824 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 2825 sdata->vif.bss_conf.sync_tsf = 2826 le64_to_cpu(mgmt->u.beacon.timestamp); 2827 sdata->vif.bss_conf.sync_device_ts = 2828 rx_status->device_timestamp; 2829 if (elems.tim) 2830 sdata->vif.bss_conf.sync_dtim_count = 2831 elems.tim->dtim_count; 2832 else 2833 sdata->vif.bss_conf.sync_dtim_count = 0; 2834 } 2835 /* continue assoc process */ 2836 ifmgd->assoc_data->timeout = jiffies; 2837 ifmgd->assoc_data->timeout_started = true; 2838 run_again(ifmgd, ifmgd->assoc_data->timeout); 2839 return RX_MGMT_NONE; 2840 } 2841 2842 if (!ifmgd->associated || 2843 !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) 2844 return RX_MGMT_NONE; 2845 bssid = ifmgd->associated->bssid; 2846 2847 /* Track average RSSI from the Beacon frames of the current AP */ 2848 ifmgd->last_beacon_signal = rx_status->signal; 2849 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { 2850 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; 2851 ifmgd->ave_beacon_signal = rx_status->signal * 16; 2852 ifmgd->last_cqm_event_signal = 0; 2853 ifmgd->count_beacon_signal = 1; 2854 ifmgd->last_ave_beacon_signal = 0; 2855 } else { 2856 ifmgd->ave_beacon_signal = 2857 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + 2858 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * 2859 ifmgd->ave_beacon_signal) / 16; 2860 ifmgd->count_beacon_signal++; 2861 } 2862 2863 if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && 2864 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { 2865 int sig = ifmgd->ave_beacon_signal; 2866 int last_sig = ifmgd->last_ave_beacon_signal; 2867 2868 /* 2869 * if signal crosses either of the boundaries, invoke callback 2870 * with appropriate parameters 2871 */ 2872 if (sig > ifmgd->rssi_max_thold && 2873 (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { 2874 ifmgd->last_ave_beacon_signal = sig; 2875 drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH); 2876 } else if (sig < ifmgd->rssi_min_thold && 2877 (last_sig >= ifmgd->rssi_max_thold || 2878 last_sig == 0)) { 2879 ifmgd->last_ave_beacon_signal = sig; 2880 drv_rssi_callback(local, sdata, RSSI_EVENT_LOW); 2881 } 2882 } 2883 2884 if (bss_conf->cqm_rssi_thold && 2885 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && 2886 !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { 2887 int sig = ifmgd->ave_beacon_signal / 16; 2888 int last_event = ifmgd->last_cqm_event_signal; 2889 int thold = bss_conf->cqm_rssi_thold; 2890 int hyst = bss_conf->cqm_rssi_hyst; 2891 if (sig < thold && 2892 (last_event == 0 || sig < last_event - hyst)) { 2893 ifmgd->last_cqm_event_signal = sig; 2894 ieee80211_cqm_rssi_notify( 2895 &sdata->vif, 2896 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, 2897 GFP_KERNEL); 2898 } else if (sig > thold && 2899 (last_event == 0 || sig > last_event + hyst)) { 2900 ifmgd->last_cqm_event_signal = sig; 2901 ieee80211_cqm_rssi_notify( 2902 &sdata->vif, 2903 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, 2904 GFP_KERNEL); 2905 } 2906 } 2907 2908 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { 2909 mlme_dbg_ratelimited(sdata, 2910 "cancelling AP probe due to a received beacon\n"); 2911 mutex_lock(&local->mtx); 2912 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; 2913 ieee80211_run_deferred_scan(local); 2914 mutex_unlock(&local->mtx); 2915 2916 mutex_lock(&local->iflist_mtx); 2917 ieee80211_recalc_ps(local, -1); 2918 mutex_unlock(&local->iflist_mtx); 2919 } 2920 2921 /* 2922 * Push the beacon loss detection into the future since 2923 * we are processing a beacon from the AP just now. 2924 */ 2925 ieee80211_sta_reset_beacon_monitor(sdata); 2926 2927 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); 2928 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, 2929 len - baselen, &elems, 2930 care_about_ies, ncrc); 2931 2932 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { 2933 bool directed_tim = ieee80211_check_tim(elems.tim, 2934 elems.tim_len, 2935 ifmgd->aid); 2936 if (directed_tim) { 2937 if (local->hw.conf.dynamic_ps_timeout > 0) { 2938 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2939 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2940 ieee80211_hw_config(local, 2941 IEEE80211_CONF_CHANGE_PS); 2942 } 2943 ieee80211_send_nullfunc(local, sdata, 0); 2944 } else if (!local->pspolling && sdata->u.mgd.powersave) { 2945 local->pspolling = true; 2946 2947 /* 2948 * Here is assumed that the driver will be 2949 * able to send ps-poll frame and receive a 2950 * response even though power save mode is 2951 * enabled, but some drivers might require 2952 * to disable power save here. This needs 2953 * to be investigated. 2954 */ 2955 ieee80211_send_pspoll(local, sdata); 2956 } 2957 } 2958 } 2959 2960 if (sdata->vif.p2p) { 2961 u8 noa[2]; 2962 int ret; 2963 2964 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable, 2965 len - baselen, 2966 IEEE80211_P2P_ATTR_ABSENCE_NOTICE, 2967 noa, sizeof(noa)); 2968 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) { 2969 bss_conf->p2p_oppps = noa[1] & 0x80; 2970 bss_conf->p2p_ctwindow = noa[1] & 0x7f; 2971 changed |= BSS_CHANGED_P2P_PS; 2972 sdata->u.mgd.p2p_noa_index = noa[0]; 2973 /* 2974 * make sure we update all information, the CRC 2975 * mechanism doesn't look at P2P attributes. 2976 */ 2977 ifmgd->beacon_crc_valid = false; 2978 } 2979 } 2980 2981 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) 2982 return RX_MGMT_NONE; 2983 ifmgd->beacon_crc = ncrc; 2984 ifmgd->beacon_crc_valid = true; 2985 2986 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems); 2987 2988 if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, 2989 elems.wmm_param_len)) 2990 changed |= BSS_CHANGED_QOS; 2991 2992 /* 2993 * If we haven't had a beacon before, tell the driver about the 2994 * DTIM period (and beacon timing if desired) now. 2995 */ 2996 if (!bss_conf->dtim_period) { 2997 /* a few bogus AP send dtim_period = 0 or no TIM IE */ 2998 if (elems.tim) 2999 bss_conf->dtim_period = elems.tim->dtim_period ?: 1; 3000 else 3001 bss_conf->dtim_period = 1; 3002 3003 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 3004 sdata->vif.bss_conf.sync_tsf = 3005 le64_to_cpu(mgmt->u.beacon.timestamp); 3006 sdata->vif.bss_conf.sync_device_ts = 3007 rx_status->device_timestamp; 3008 if (elems.tim) 3009 sdata->vif.bss_conf.sync_dtim_count = 3010 elems.tim->dtim_count; 3011 else 3012 sdata->vif.bss_conf.sync_dtim_count = 0; 3013 } 3014 3015 changed |= BSS_CHANGED_DTIM_PERIOD; 3016 } 3017 3018 if (elems.erp_info && elems.erp_info_len >= 1) { 3019 erp_valid = true; 3020 erp_value = elems.erp_info[0]; 3021 } else { 3022 erp_valid = false; 3023 } 3024 changed |= ieee80211_handle_bss_capability(sdata, 3025 le16_to_cpu(mgmt->u.beacon.capab_info), 3026 erp_valid, erp_value); 3027 3028 mutex_lock(&local->sta_mtx); 3029 sta = sta_info_get(sdata, bssid); 3030 3031 if (ieee80211_config_bw(sdata, sta, elems.ht_operation, 3032 elems.vht_operation, bssid, &changed)) { 3033 mutex_unlock(&local->sta_mtx); 3034 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 3035 WLAN_REASON_DEAUTH_LEAVING, 3036 true, deauth_buf); 3037 return RX_MGMT_CFG80211_TX_DEAUTH; 3038 } 3039 3040 if (sta && elems.opmode_notif) 3041 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif, 3042 rx_status->band, true); 3043 mutex_unlock(&local->sta_mtx); 3044 3045 if (elems.country_elem && elems.pwr_constr_elem && 3046 mgmt->u.probe_resp.capab_info & 3047 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) 3048 changed |= ieee80211_handle_pwr_constr(sdata, chan, 3049 elems.country_elem, 3050 elems.country_elem_len, 3051 elems.pwr_constr_elem); 3052 3053 ieee80211_bss_info_change_notify(sdata, changed); 3054 3055 return RX_MGMT_NONE; 3056 } 3057 3058 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 3059 struct sk_buff *skb) 3060 { 3061 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3062 struct ieee80211_rx_status *rx_status; 3063 struct ieee80211_mgmt *mgmt; 3064 struct cfg80211_bss *bss = NULL; 3065 enum rx_mgmt_action rma = RX_MGMT_NONE; 3066 u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3067 u16 fc; 3068 3069 rx_status = (struct ieee80211_rx_status *) skb->cb; 3070 mgmt = (struct ieee80211_mgmt *) skb->data; 3071 fc = le16_to_cpu(mgmt->frame_control); 3072 3073 mutex_lock(&ifmgd->mtx); 3074 3075 switch (fc & IEEE80211_FCTL_STYPE) { 3076 case IEEE80211_STYPE_BEACON: 3077 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, 3078 deauth_buf, rx_status); 3079 break; 3080 case IEEE80211_STYPE_PROBE_RESP: 3081 ieee80211_rx_mgmt_probe_resp(sdata, skb); 3082 break; 3083 case IEEE80211_STYPE_AUTH: 3084 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); 3085 break; 3086 case IEEE80211_STYPE_DEAUTH: 3087 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); 3088 break; 3089 case IEEE80211_STYPE_DISASSOC: 3090 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); 3091 break; 3092 case IEEE80211_STYPE_ASSOC_RESP: 3093 case IEEE80211_STYPE_REASSOC_RESP: 3094 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss); 3095 break; 3096 case IEEE80211_STYPE_ACTION: 3097 switch (mgmt->u.action.category) { 3098 case WLAN_CATEGORY_SPECTRUM_MGMT: 3099 ieee80211_sta_process_chanswitch(sdata, 3100 &mgmt->u.action.u.chan_switch.sw_elem, 3101 (void *)ifmgd->associated->priv, 3102 rx_status->mactime); 3103 break; 3104 } 3105 } 3106 mutex_unlock(&ifmgd->mtx); 3107 3108 switch (rma) { 3109 case RX_MGMT_NONE: 3110 /* no action */ 3111 break; 3112 case RX_MGMT_CFG80211_DEAUTH: 3113 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); 3114 break; 3115 case RX_MGMT_CFG80211_DISASSOC: 3116 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); 3117 break; 3118 case RX_MGMT_CFG80211_RX_AUTH: 3119 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len); 3120 break; 3121 case RX_MGMT_CFG80211_RX_ASSOC: 3122 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len); 3123 break; 3124 case RX_MGMT_CFG80211_ASSOC_TIMEOUT: 3125 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid); 3126 break; 3127 case RX_MGMT_CFG80211_TX_DEAUTH: 3128 cfg80211_send_deauth(sdata->dev, deauth_buf, 3129 sizeof(deauth_buf)); 3130 break; 3131 default: 3132 WARN(1, "unexpected: %d", rma); 3133 } 3134 } 3135 3136 static void ieee80211_sta_timer(unsigned long data) 3137 { 3138 struct ieee80211_sub_if_data *sdata = 3139 (struct ieee80211_sub_if_data *) data; 3140 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3141 struct ieee80211_local *local = sdata->local; 3142 3143 if (local->quiescing) { 3144 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 3145 return; 3146 } 3147 3148 ieee80211_queue_work(&local->hw, &sdata->work); 3149 } 3150 3151 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, 3152 u8 *bssid, u8 reason, bool tx) 3153 { 3154 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3155 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 3156 3157 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, 3158 tx, frame_buf); 3159 mutex_unlock(&ifmgd->mtx); 3160 3161 /* 3162 * must be outside lock due to cfg80211, 3163 * but that's not a problem. 3164 */ 3165 cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN); 3166 3167 mutex_lock(&ifmgd->mtx); 3168 } 3169 3170 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) 3171 { 3172 struct ieee80211_local *local = sdata->local; 3173 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3174 struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; 3175 u32 tx_flags = 0; 3176 3177 lockdep_assert_held(&ifmgd->mtx); 3178 3179 if (WARN_ON_ONCE(!auth_data)) 3180 return -EINVAL; 3181 3182 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3183 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 3184 IEEE80211_TX_INTFL_MLME_CONN_TX; 3185 3186 auth_data->tries++; 3187 3188 if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { 3189 sdata_info(sdata, "authentication with %pM timed out\n", 3190 auth_data->bss->bssid); 3191 3192 /* 3193 * Most likely AP is not in the range so remove the 3194 * bss struct for that AP. 3195 */ 3196 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); 3197 3198 return -ETIMEDOUT; 3199 } 3200 3201 drv_mgd_prepare_tx(local, sdata); 3202 3203 if (auth_data->bss->proberesp_ies) { 3204 u16 trans = 1; 3205 u16 status = 0; 3206 3207 sdata_info(sdata, "send auth to %pM (try %d/%d)\n", 3208 auth_data->bss->bssid, auth_data->tries, 3209 IEEE80211_AUTH_MAX_TRIES); 3210 3211 auth_data->expected_transaction = 2; 3212 3213 if (auth_data->algorithm == WLAN_AUTH_SAE) { 3214 trans = auth_data->sae_trans; 3215 status = auth_data->sae_status; 3216 auth_data->expected_transaction = trans; 3217 } 3218 3219 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status, 3220 auth_data->data, auth_data->data_len, 3221 auth_data->bss->bssid, 3222 auth_data->bss->bssid, NULL, 0, 0, 3223 tx_flags); 3224 } else { 3225 const u8 *ssidie; 3226 3227 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n", 3228 auth_data->bss->bssid, auth_data->tries, 3229 IEEE80211_AUTH_MAX_TRIES); 3230 3231 rcu_read_lock(); 3232 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); 3233 if (!ssidie) { 3234 rcu_read_unlock(); 3235 return -EINVAL; 3236 } 3237 /* 3238 * Direct probe is sent to broadcast address as some APs 3239 * will not answer to direct packet in unassociated state. 3240 */ 3241 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1], 3242 NULL, 0, (u32) -1, true, tx_flags, 3243 auth_data->bss->channel, false); 3244 rcu_read_unlock(); 3245 } 3246 3247 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) { 3248 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; 3249 ifmgd->auth_data->timeout_started = true; 3250 run_again(ifmgd, auth_data->timeout); 3251 } else { 3252 auth_data->timeout_started = false; 3253 } 3254 3255 return 0; 3256 } 3257 3258 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) 3259 { 3260 struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; 3261 struct ieee80211_local *local = sdata->local; 3262 3263 lockdep_assert_held(&sdata->u.mgd.mtx); 3264 3265 assoc_data->tries++; 3266 if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { 3267 sdata_info(sdata, "association with %pM timed out\n", 3268 assoc_data->bss->bssid); 3269 3270 /* 3271 * Most likely AP is not in the range so remove the 3272 * bss struct for that AP. 3273 */ 3274 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); 3275 3276 return -ETIMEDOUT; 3277 } 3278 3279 sdata_info(sdata, "associate with %pM (try %d/%d)\n", 3280 assoc_data->bss->bssid, assoc_data->tries, 3281 IEEE80211_ASSOC_MAX_TRIES); 3282 ieee80211_send_assoc(sdata); 3283 3284 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) { 3285 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; 3286 assoc_data->timeout_started = true; 3287 run_again(&sdata->u.mgd, assoc_data->timeout); 3288 } else { 3289 assoc_data->timeout_started = false; 3290 } 3291 3292 return 0; 3293 } 3294 3295 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata, 3296 __le16 fc, bool acked) 3297 { 3298 struct ieee80211_local *local = sdata->local; 3299 3300 sdata->u.mgd.status_fc = fc; 3301 sdata->u.mgd.status_acked = acked; 3302 sdata->u.mgd.status_received = true; 3303 3304 ieee80211_queue_work(&local->hw, &sdata->work); 3305 } 3306 3307 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) 3308 { 3309 struct ieee80211_local *local = sdata->local; 3310 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3311 3312 mutex_lock(&ifmgd->mtx); 3313 3314 if (ifmgd->status_received) { 3315 __le16 fc = ifmgd->status_fc; 3316 bool status_acked = ifmgd->status_acked; 3317 3318 ifmgd->status_received = false; 3319 if (ifmgd->auth_data && 3320 (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) { 3321 if (status_acked) { 3322 ifmgd->auth_data->timeout = 3323 jiffies + IEEE80211_AUTH_TIMEOUT_SHORT; 3324 run_again(ifmgd, ifmgd->auth_data->timeout); 3325 } else { 3326 ifmgd->auth_data->timeout = jiffies - 1; 3327 } 3328 ifmgd->auth_data->timeout_started = true; 3329 } else if (ifmgd->assoc_data && 3330 (ieee80211_is_assoc_req(fc) || 3331 ieee80211_is_reassoc_req(fc))) { 3332 if (status_acked) { 3333 ifmgd->assoc_data->timeout = 3334 jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT; 3335 run_again(ifmgd, ifmgd->assoc_data->timeout); 3336 } else { 3337 ifmgd->assoc_data->timeout = jiffies - 1; 3338 } 3339 ifmgd->assoc_data->timeout_started = true; 3340 } 3341 } 3342 3343 if (ifmgd->auth_data && ifmgd->auth_data->timeout_started && 3344 time_after(jiffies, ifmgd->auth_data->timeout)) { 3345 if (ifmgd->auth_data->done) { 3346 /* 3347 * ok ... we waited for assoc but userspace didn't, 3348 * so let's just kill the auth data 3349 */ 3350 ieee80211_destroy_auth_data(sdata, false); 3351 } else if (ieee80211_probe_auth(sdata)) { 3352 u8 bssid[ETH_ALEN]; 3353 3354 memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); 3355 3356 ieee80211_destroy_auth_data(sdata, false); 3357 3358 mutex_unlock(&ifmgd->mtx); 3359 cfg80211_send_auth_timeout(sdata->dev, bssid); 3360 mutex_lock(&ifmgd->mtx); 3361 } 3362 } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started) 3363 run_again(ifmgd, ifmgd->auth_data->timeout); 3364 3365 if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started && 3366 time_after(jiffies, ifmgd->assoc_data->timeout)) { 3367 if ((ifmgd->assoc_data->need_beacon && 3368 !ifmgd->assoc_data->have_beacon) || 3369 ieee80211_do_assoc(sdata)) { 3370 u8 bssid[ETH_ALEN]; 3371 3372 memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN); 3373 3374 ieee80211_destroy_assoc_data(sdata, false); 3375 3376 mutex_unlock(&ifmgd->mtx); 3377 cfg80211_send_assoc_timeout(sdata->dev, bssid); 3378 mutex_lock(&ifmgd->mtx); 3379 } 3380 } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started) 3381 run_again(ifmgd, ifmgd->assoc_data->timeout); 3382 3383 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | 3384 IEEE80211_STA_CONNECTION_POLL) && 3385 ifmgd->associated) { 3386 u8 bssid[ETH_ALEN]; 3387 int max_tries; 3388 3389 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); 3390 3391 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 3392 max_tries = max_nullfunc_tries; 3393 else 3394 max_tries = max_probe_tries; 3395 3396 /* ACK received for nullfunc probing frame */ 3397 if (!ifmgd->probe_send_count) 3398 ieee80211_reset_ap_probe(sdata); 3399 else if (ifmgd->nullfunc_failed) { 3400 if (ifmgd->probe_send_count < max_tries) { 3401 mlme_dbg(sdata, 3402 "No ack for nullfunc frame to AP %pM, try %d/%i\n", 3403 bssid, ifmgd->probe_send_count, 3404 max_tries); 3405 ieee80211_mgd_probe_ap_send(sdata); 3406 } else { 3407 mlme_dbg(sdata, 3408 "No ack for nullfunc frame to AP %pM, disconnecting.\n", 3409 bssid); 3410 ieee80211_sta_connection_lost(sdata, bssid, 3411 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, 3412 false); 3413 } 3414 } else if (time_is_after_jiffies(ifmgd->probe_timeout)) 3415 run_again(ifmgd, ifmgd->probe_timeout); 3416 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 3417 mlme_dbg(sdata, 3418 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", 3419 bssid, probe_wait_ms); 3420 ieee80211_sta_connection_lost(sdata, bssid, 3421 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3422 } else if (ifmgd->probe_send_count < max_tries) { 3423 mlme_dbg(sdata, 3424 "No probe response from AP %pM after %dms, try %d/%i\n", 3425 bssid, probe_wait_ms, 3426 ifmgd->probe_send_count, max_tries); 3427 ieee80211_mgd_probe_ap_send(sdata); 3428 } else { 3429 /* 3430 * We actually lost the connection ... or did we? 3431 * Let's make sure! 3432 */ 3433 wiphy_debug(local->hw.wiphy, 3434 "%s: No probe response from AP %pM" 3435 " after %dms, disconnecting.\n", 3436 sdata->name, 3437 bssid, probe_wait_ms); 3438 3439 ieee80211_sta_connection_lost(sdata, bssid, 3440 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false); 3441 } 3442 } 3443 3444 mutex_unlock(&ifmgd->mtx); 3445 } 3446 3447 static void ieee80211_sta_bcn_mon_timer(unsigned long data) 3448 { 3449 struct ieee80211_sub_if_data *sdata = 3450 (struct ieee80211_sub_if_data *) data; 3451 struct ieee80211_local *local = sdata->local; 3452 3453 if (local->quiescing) 3454 return; 3455 3456 sdata->u.mgd.connection_loss = false; 3457 ieee80211_queue_work(&sdata->local->hw, 3458 &sdata->u.mgd.beacon_connection_loss_work); 3459 } 3460 3461 static void ieee80211_sta_conn_mon_timer(unsigned long data) 3462 { 3463 struct ieee80211_sub_if_data *sdata = 3464 (struct ieee80211_sub_if_data *) data; 3465 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3466 struct ieee80211_local *local = sdata->local; 3467 3468 if (local->quiescing) 3469 return; 3470 3471 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); 3472 } 3473 3474 static void ieee80211_sta_monitor_work(struct work_struct *work) 3475 { 3476 struct ieee80211_sub_if_data *sdata = 3477 container_of(work, struct ieee80211_sub_if_data, 3478 u.mgd.monitor_work); 3479 3480 ieee80211_mgd_probe_ap(sdata, false); 3481 } 3482 3483 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 3484 { 3485 u32 flags; 3486 3487 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 3488 __ieee80211_stop_poll(sdata); 3489 3490 /* let's probe the connection once */ 3491 flags = sdata->local->hw.flags; 3492 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) 3493 ieee80211_queue_work(&sdata->local->hw, 3494 &sdata->u.mgd.monitor_work); 3495 /* and do all the other regular work too */ 3496 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 3497 } 3498 } 3499 3500 #ifdef CONFIG_PM 3501 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) 3502 { 3503 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3504 3505 /* 3506 * we need to use atomic bitops for the running bits 3507 * only because both timers might fire at the same 3508 * time -- the code here is properly synchronised. 3509 */ 3510 3511 cancel_work_sync(&ifmgd->request_smps_work); 3512 3513 cancel_work_sync(&ifmgd->monitor_work); 3514 cancel_work_sync(&ifmgd->beacon_connection_loss_work); 3515 cancel_work_sync(&ifmgd->csa_connection_drop_work); 3516 if (del_timer_sync(&ifmgd->timer)) 3517 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); 3518 3519 cancel_work_sync(&ifmgd->chswitch_work); 3520 if (del_timer_sync(&ifmgd->chswitch_timer)) 3521 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); 3522 3523 /* these will just be re-established on connection */ 3524 del_timer_sync(&ifmgd->conn_mon_timer); 3525 del_timer_sync(&ifmgd->bcn_mon_timer); 3526 } 3527 3528 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) 3529 { 3530 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3531 3532 mutex_lock(&ifmgd->mtx); 3533 if (!ifmgd->associated) { 3534 mutex_unlock(&ifmgd->mtx); 3535 return; 3536 } 3537 3538 if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { 3539 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; 3540 mlme_dbg(sdata, "driver requested disconnect after resume\n"); 3541 ieee80211_sta_connection_lost(sdata, 3542 ifmgd->associated->bssid, 3543 WLAN_REASON_UNSPECIFIED, 3544 true); 3545 mutex_unlock(&ifmgd->mtx); 3546 return; 3547 } 3548 mutex_unlock(&ifmgd->mtx); 3549 3550 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) 3551 add_timer(&ifmgd->timer); 3552 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) 3553 add_timer(&ifmgd->chswitch_timer); 3554 ieee80211_sta_reset_beacon_monitor(sdata); 3555 3556 mutex_lock(&sdata->local->mtx); 3557 ieee80211_restart_sta_timer(sdata); 3558 mutex_unlock(&sdata->local->mtx); 3559 } 3560 #endif 3561 3562 /* interface setup */ 3563 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 3564 { 3565 struct ieee80211_if_managed *ifmgd; 3566 3567 ifmgd = &sdata->u.mgd; 3568 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); 3569 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); 3570 INIT_WORK(&ifmgd->beacon_connection_loss_work, 3571 ieee80211_beacon_connection_loss_work); 3572 INIT_WORK(&ifmgd->csa_connection_drop_work, 3573 ieee80211_csa_connection_drop_work); 3574 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); 3575 setup_timer(&ifmgd->timer, ieee80211_sta_timer, 3576 (unsigned long) sdata); 3577 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 3578 (unsigned long) sdata); 3579 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 3580 (unsigned long) sdata); 3581 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 3582 (unsigned long) sdata); 3583 3584 ifmgd->flags = 0; 3585 ifmgd->powersave = sdata->wdev.ps; 3586 ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; 3587 ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; 3588 3589 mutex_init(&ifmgd->mtx); 3590 3591 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) 3592 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; 3593 else 3594 ifmgd->req_smps = IEEE80211_SMPS_OFF; 3595 } 3596 3597 /* scan finished notification */ 3598 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 3599 { 3600 struct ieee80211_sub_if_data *sdata; 3601 3602 /* Restart STA timers */ 3603 rcu_read_lock(); 3604 list_for_each_entry_rcu(sdata, &local->interfaces, list) 3605 ieee80211_restart_sta_timer(sdata); 3606 rcu_read_unlock(); 3607 } 3608 3609 int ieee80211_max_network_latency(struct notifier_block *nb, 3610 unsigned long data, void *dummy) 3611 { 3612 s32 latency_usec = (s32) data; 3613 struct ieee80211_local *local = 3614 container_of(nb, struct ieee80211_local, 3615 network_latency_notifier); 3616 3617 mutex_lock(&local->iflist_mtx); 3618 ieee80211_recalc_ps(local, latency_usec); 3619 mutex_unlock(&local->iflist_mtx); 3620 3621 return 0; 3622 } 3623 3624 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata, 3625 struct cfg80211_bss *cbss) 3626 { 3627 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3628 const u8 *ht_cap_ie, *vht_cap_ie; 3629 const struct ieee80211_ht_cap *ht_cap; 3630 const struct ieee80211_vht_cap *vht_cap; 3631 u8 chains = 1; 3632 3633 if (ifmgd->flags & IEEE80211_STA_DISABLE_HT) 3634 return chains; 3635 3636 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 3637 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) { 3638 ht_cap = (void *)(ht_cap_ie + 2); 3639 chains = ieee80211_mcs_to_chains(&ht_cap->mcs); 3640 /* 3641 * TODO: use "Tx Maximum Number Spatial Streams Supported" and 3642 * "Tx Unequal Modulation Supported" fields. 3643 */ 3644 } 3645 3646 if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) 3647 return chains; 3648 3649 vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 3650 if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) { 3651 u8 nss; 3652 u16 tx_mcs_map; 3653 3654 vht_cap = (void *)(vht_cap_ie + 2); 3655 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map); 3656 for (nss = 8; nss > 0; nss--) { 3657 if (((tx_mcs_map >> (2 * (nss - 1))) & 3) != 3658 IEEE80211_VHT_MCS_NOT_SUPPORTED) 3659 break; 3660 } 3661 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */ 3662 chains = max(chains, nss); 3663 } 3664 3665 return chains; 3666 } 3667 3668 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, 3669 struct cfg80211_bss *cbss) 3670 { 3671 struct ieee80211_local *local = sdata->local; 3672 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3673 const struct ieee80211_ht_operation *ht_oper = NULL; 3674 const struct ieee80211_vht_operation *vht_oper = NULL; 3675 struct ieee80211_supported_band *sband; 3676 struct cfg80211_chan_def chandef; 3677 int ret; 3678 3679 sband = local->hw.wiphy->bands[cbss->channel->band]; 3680 3681 ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ | 3682 IEEE80211_STA_DISABLE_80P80MHZ | 3683 IEEE80211_STA_DISABLE_160MHZ); 3684 3685 rcu_read_lock(); 3686 3687 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) && 3688 sband->ht_cap.ht_supported) { 3689 const u8 *ht_oper_ie, *ht_cap; 3690 3691 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION); 3692 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) 3693 ht_oper = (void *)(ht_oper_ie + 2); 3694 3695 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY); 3696 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) { 3697 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 3698 ht_oper = NULL; 3699 } 3700 } 3701 3702 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) && 3703 sband->vht_cap.vht_supported) { 3704 const u8 *vht_oper_ie, *vht_cap; 3705 3706 vht_oper_ie = ieee80211_bss_get_ie(cbss, 3707 WLAN_EID_VHT_OPERATION); 3708 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper)) 3709 vht_oper = (void *)(vht_oper_ie + 2); 3710 if (vht_oper && !ht_oper) { 3711 vht_oper = NULL; 3712 sdata_info(sdata, 3713 "AP advertised VHT without HT, disabling both\n"); 3714 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 3715 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 3716 } 3717 3718 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY); 3719 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) { 3720 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 3721 vht_oper = NULL; 3722 } 3723 } 3724 3725 ifmgd->flags |= ieee80211_determine_chantype(sdata, sband, 3726 cbss->channel, 3727 ht_oper, vht_oper, 3728 &chandef, true); 3729 3730 sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss), 3731 local->rx_chains); 3732 3733 rcu_read_unlock(); 3734 3735 /* will change later if needed */ 3736 sdata->smps_mode = IEEE80211_SMPS_OFF; 3737 3738 /* 3739 * If this fails (possibly due to channel context sharing 3740 * on incompatible channels, e.g. 80+80 and 160 sharing the 3741 * same control channel) try to use a smaller bandwidth. 3742 */ 3743 ret = ieee80211_vif_use_channel(sdata, &chandef, 3744 IEEE80211_CHANCTX_SHARED); 3745 while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) { 3746 ifmgd->flags |= chandef_downgrade(&chandef); 3747 ret = ieee80211_vif_use_channel(sdata, &chandef, 3748 IEEE80211_CHANCTX_SHARED); 3749 } 3750 return ret; 3751 } 3752 3753 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, 3754 struct cfg80211_bss *cbss, bool assoc) 3755 { 3756 struct ieee80211_local *local = sdata->local; 3757 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3758 struct ieee80211_bss *bss = (void *)cbss->priv; 3759 struct sta_info *new_sta = NULL; 3760 bool have_sta = false; 3761 int err; 3762 3763 if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) 3764 return -EINVAL; 3765 3766 if (assoc) { 3767 rcu_read_lock(); 3768 have_sta = sta_info_get(sdata, cbss->bssid); 3769 rcu_read_unlock(); 3770 } 3771 3772 if (!have_sta) { 3773 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); 3774 if (!new_sta) 3775 return -ENOMEM; 3776 } 3777 3778 if (new_sta) { 3779 u32 rates = 0, basic_rates = 0; 3780 bool have_higher_than_11mbit; 3781 int min_rate = INT_MAX, min_rate_index = -1; 3782 struct ieee80211_supported_band *sband; 3783 const struct cfg80211_bss_ies *ies; 3784 3785 sband = local->hw.wiphy->bands[cbss->channel->band]; 3786 3787 err = ieee80211_prep_channel(sdata, cbss); 3788 if (err) { 3789 sta_info_free(local, new_sta); 3790 return err; 3791 } 3792 3793 ieee80211_get_rates(sband, bss->supp_rates, 3794 bss->supp_rates_len, 3795 &rates, &basic_rates, 3796 &have_higher_than_11mbit, 3797 &min_rate, &min_rate_index); 3798 3799 /* 3800 * This used to be a workaround for basic rates missing 3801 * in the association response frame. Now that we no 3802 * longer use the basic rates from there, it probably 3803 * doesn't happen any more, but keep the workaround so 3804 * in case some *other* APs are buggy in different ways 3805 * we can connect -- with a warning. 3806 */ 3807 if (!basic_rates && min_rate_index >= 0) { 3808 sdata_info(sdata, 3809 "No basic rates, using min rate instead\n"); 3810 basic_rates = BIT(min_rate_index); 3811 } 3812 3813 new_sta->sta.supp_rates[cbss->channel->band] = rates; 3814 sdata->vif.bss_conf.basic_rates = basic_rates; 3815 3816 /* cf. IEEE 802.11 9.2.12 */ 3817 if (cbss->channel->band == IEEE80211_BAND_2GHZ && 3818 have_higher_than_11mbit) 3819 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 3820 else 3821 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 3822 3823 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); 3824 3825 /* set timing information */ 3826 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; 3827 rcu_read_lock(); 3828 ies = rcu_dereference(cbss->beacon_ies); 3829 if (ies) { 3830 const u8 *tim_ie; 3831 3832 sdata->vif.bss_conf.sync_tsf = ies->tsf; 3833 sdata->vif.bss_conf.sync_device_ts = 3834 bss->device_ts_beacon; 3835 tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 3836 ies->data, ies->len); 3837 if (tim_ie && tim_ie[1] >= 2) 3838 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2]; 3839 else 3840 sdata->vif.bss_conf.sync_dtim_count = 0; 3841 } else if (!(local->hw.flags & 3842 IEEE80211_HW_TIMING_BEACON_ONLY)) { 3843 ies = rcu_dereference(cbss->proberesp_ies); 3844 /* must be non-NULL since beacon IEs were NULL */ 3845 sdata->vif.bss_conf.sync_tsf = ies->tsf; 3846 sdata->vif.bss_conf.sync_device_ts = 3847 bss->device_ts_presp; 3848 sdata->vif.bss_conf.sync_dtim_count = 0; 3849 } else { 3850 sdata->vif.bss_conf.sync_tsf = 0; 3851 sdata->vif.bss_conf.sync_device_ts = 0; 3852 sdata->vif.bss_conf.sync_dtim_count = 0; 3853 } 3854 rcu_read_unlock(); 3855 3856 /* tell driver about BSSID, basic rates and timing */ 3857 ieee80211_bss_info_change_notify(sdata, 3858 BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | 3859 BSS_CHANGED_BEACON_INT); 3860 3861 if (assoc) 3862 sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); 3863 3864 err = sta_info_insert(new_sta); 3865 new_sta = NULL; 3866 if (err) { 3867 sdata_info(sdata, 3868 "failed to insert STA entry for the AP (error %d)\n", 3869 err); 3870 return err; 3871 } 3872 } else 3873 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); 3874 3875 return 0; 3876 } 3877 3878 /* config hooks */ 3879 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, 3880 struct cfg80211_auth_request *req) 3881 { 3882 struct ieee80211_local *local = sdata->local; 3883 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3884 struct ieee80211_mgd_auth_data *auth_data; 3885 u16 auth_alg; 3886 int err; 3887 3888 /* prepare auth data structure */ 3889 3890 switch (req->auth_type) { 3891 case NL80211_AUTHTYPE_OPEN_SYSTEM: 3892 auth_alg = WLAN_AUTH_OPEN; 3893 break; 3894 case NL80211_AUTHTYPE_SHARED_KEY: 3895 if (IS_ERR(local->wep_tx_tfm)) 3896 return -EOPNOTSUPP; 3897 auth_alg = WLAN_AUTH_SHARED_KEY; 3898 break; 3899 case NL80211_AUTHTYPE_FT: 3900 auth_alg = WLAN_AUTH_FT; 3901 break; 3902 case NL80211_AUTHTYPE_NETWORK_EAP: 3903 auth_alg = WLAN_AUTH_LEAP; 3904 break; 3905 case NL80211_AUTHTYPE_SAE: 3906 auth_alg = WLAN_AUTH_SAE; 3907 break; 3908 default: 3909 return -EOPNOTSUPP; 3910 } 3911 3912 auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len + 3913 req->ie_len, GFP_KERNEL); 3914 if (!auth_data) 3915 return -ENOMEM; 3916 3917 auth_data->bss = req->bss; 3918 3919 if (req->sae_data_len >= 4) { 3920 __le16 *pos = (__le16 *) req->sae_data; 3921 auth_data->sae_trans = le16_to_cpu(pos[0]); 3922 auth_data->sae_status = le16_to_cpu(pos[1]); 3923 memcpy(auth_data->data, req->sae_data + 4, 3924 req->sae_data_len - 4); 3925 auth_data->data_len += req->sae_data_len - 4; 3926 } 3927 3928 if (req->ie && req->ie_len) { 3929 memcpy(&auth_data->data[auth_data->data_len], 3930 req->ie, req->ie_len); 3931 auth_data->data_len += req->ie_len; 3932 } 3933 3934 if (req->key && req->key_len) { 3935 auth_data->key_len = req->key_len; 3936 auth_data->key_idx = req->key_idx; 3937 memcpy(auth_data->key, req->key, req->key_len); 3938 } 3939 3940 auth_data->algorithm = auth_alg; 3941 3942 /* try to authenticate/probe */ 3943 3944 mutex_lock(&ifmgd->mtx); 3945 3946 if ((ifmgd->auth_data && !ifmgd->auth_data->done) || 3947 ifmgd->assoc_data) { 3948 err = -EBUSY; 3949 goto err_free; 3950 } 3951 3952 if (ifmgd->auth_data) 3953 ieee80211_destroy_auth_data(sdata, false); 3954 3955 /* prep auth_data so we don't go into idle on disassoc */ 3956 ifmgd->auth_data = auth_data; 3957 3958 if (ifmgd->associated) 3959 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 3960 3961 sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); 3962 3963 err = ieee80211_prep_connection(sdata, req->bss, false); 3964 if (err) 3965 goto err_clear; 3966 3967 err = ieee80211_probe_auth(sdata); 3968 if (err) { 3969 sta_info_destroy_addr(sdata, req->bss->bssid); 3970 goto err_clear; 3971 } 3972 3973 /* hold our own reference */ 3974 cfg80211_ref_bss(local->hw.wiphy, auth_data->bss); 3975 err = 0; 3976 goto out_unlock; 3977 3978 err_clear: 3979 memset(ifmgd->bssid, 0, ETH_ALEN); 3980 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 3981 ifmgd->auth_data = NULL; 3982 err_free: 3983 kfree(auth_data); 3984 out_unlock: 3985 mutex_unlock(&ifmgd->mtx); 3986 3987 return err; 3988 } 3989 3990 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, 3991 struct cfg80211_assoc_request *req) 3992 { 3993 struct ieee80211_local *local = sdata->local; 3994 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 3995 struct ieee80211_bss *bss = (void *)req->bss->priv; 3996 struct ieee80211_mgd_assoc_data *assoc_data; 3997 const struct cfg80211_bss_ies *beacon_ies; 3998 struct ieee80211_supported_band *sband; 3999 const u8 *ssidie, *ht_ie, *vht_ie; 4000 int i, err; 4001 4002 assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); 4003 if (!assoc_data) 4004 return -ENOMEM; 4005 4006 rcu_read_lock(); 4007 ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); 4008 if (!ssidie) { 4009 rcu_read_unlock(); 4010 kfree(assoc_data); 4011 return -EINVAL; 4012 } 4013 memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); 4014 assoc_data->ssid_len = ssidie[1]; 4015 rcu_read_unlock(); 4016 4017 mutex_lock(&ifmgd->mtx); 4018 4019 if (ifmgd->associated) 4020 ieee80211_set_disassoc(sdata, 0, 0, false, NULL); 4021 4022 if (ifmgd->auth_data && !ifmgd->auth_data->done) { 4023 err = -EBUSY; 4024 goto err_free; 4025 } 4026 4027 if (ifmgd->assoc_data) { 4028 err = -EBUSY; 4029 goto err_free; 4030 } 4031 4032 if (ifmgd->auth_data) { 4033 bool match; 4034 4035 /* keep sta info, bssid if matching */ 4036 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); 4037 ieee80211_destroy_auth_data(sdata, match); 4038 } 4039 4040 /* prepare assoc data */ 4041 4042 ifmgd->beacon_crc_valid = false; 4043 4044 /* 4045 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. 4046 * We still associate in non-HT mode (11a/b/g) if any one of these 4047 * ciphers is configured as pairwise. 4048 * We can set this to true for non-11n hardware, that'll be checked 4049 * separately along with the peer capabilities. 4050 */ 4051 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { 4052 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || 4053 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || 4054 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { 4055 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4056 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4057 netdev_info(sdata->dev, 4058 "disabling HT/VHT due to WEP/TKIP use\n"); 4059 } 4060 } 4061 4062 if (req->flags & ASSOC_REQ_DISABLE_HT) { 4063 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4064 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4065 } 4066 4067 /* Also disable HT if we don't support it or the AP doesn't use WMM */ 4068 sband = local->hw.wiphy->bands[req->bss->channel->band]; 4069 if (!sband->ht_cap.ht_supported || 4070 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) { 4071 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4072 if (!bss->wmm_used) 4073 netdev_info(sdata->dev, 4074 "disabling HT as WMM/QoS is not supported by the AP\n"); 4075 } 4076 4077 /* disable VHT if we don't support it or the AP doesn't use WMM */ 4078 if (!sband->vht_cap.vht_supported || 4079 local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) { 4080 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4081 if (!bss->wmm_used) 4082 netdev_info(sdata->dev, 4083 "disabling VHT as WMM/QoS is not supported by the AP\n"); 4084 } 4085 4086 memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); 4087 memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, 4088 sizeof(ifmgd->ht_capa_mask)); 4089 4090 if (req->ie && req->ie_len) { 4091 memcpy(assoc_data->ie, req->ie, req->ie_len); 4092 assoc_data->ie_len = req->ie_len; 4093 } 4094 4095 assoc_data->bss = req->bss; 4096 4097 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { 4098 if (ifmgd->powersave) 4099 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 4100 else 4101 sdata->smps_mode = IEEE80211_SMPS_OFF; 4102 } else 4103 sdata->smps_mode = ifmgd->req_smps; 4104 4105 assoc_data->capability = req->bss->capability; 4106 assoc_data->wmm = bss->wmm_used && 4107 (local->hw.queues >= IEEE80211_NUM_ACS); 4108 assoc_data->supp_rates = bss->supp_rates; 4109 assoc_data->supp_rates_len = bss->supp_rates_len; 4110 4111 rcu_read_lock(); 4112 ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); 4113 if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) 4114 assoc_data->ap_ht_param = 4115 ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; 4116 else 4117 ifmgd->flags |= IEEE80211_STA_DISABLE_HT; 4118 vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY); 4119 if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap)) 4120 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2, 4121 sizeof(struct ieee80211_vht_cap)); 4122 else 4123 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; 4124 rcu_read_unlock(); 4125 4126 if (bss->wmm_used && bss->uapsd_supported && 4127 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { 4128 assoc_data->uapsd = true; 4129 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; 4130 } else { 4131 assoc_data->uapsd = false; 4132 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; 4133 } 4134 4135 if (req->prev_bssid) 4136 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); 4137 4138 if (req->use_mfp) { 4139 ifmgd->mfp = IEEE80211_MFP_REQUIRED; 4140 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; 4141 } else { 4142 ifmgd->mfp = IEEE80211_MFP_DISABLED; 4143 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; 4144 } 4145 4146 if (req->crypto.control_port) 4147 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; 4148 else 4149 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; 4150 4151 sdata->control_port_protocol = req->crypto.control_port_ethertype; 4152 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; 4153 4154 /* kick off associate process */ 4155 4156 ifmgd->assoc_data = assoc_data; 4157 ifmgd->dtim_period = 0; 4158 4159 err = ieee80211_prep_connection(sdata, req->bss, true); 4160 if (err) 4161 goto err_clear; 4162 4163 rcu_read_lock(); 4164 beacon_ies = rcu_dereference(req->bss->beacon_ies); 4165 4166 if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC && 4167 !beacon_ies) { 4168 /* 4169 * Wait up to one beacon interval ... 4170 * should this be more if we miss one? 4171 */ 4172 sdata_info(sdata, "waiting for beacon from %pM\n", 4173 ifmgd->bssid); 4174 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); 4175 assoc_data->timeout_started = true; 4176 assoc_data->need_beacon = true; 4177 } else if (beacon_ies) { 4178 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, 4179 beacon_ies->data, 4180 beacon_ies->len); 4181 u8 dtim_count = 0; 4182 4183 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) { 4184 const struct ieee80211_tim_ie *tim; 4185 tim = (void *)(tim_ie + 2); 4186 ifmgd->dtim_period = tim->dtim_period; 4187 dtim_count = tim->dtim_count; 4188 } 4189 assoc_data->have_beacon = true; 4190 assoc_data->timeout = jiffies; 4191 assoc_data->timeout_started = true; 4192 4193 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) { 4194 sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf; 4195 sdata->vif.bss_conf.sync_device_ts = 4196 bss->device_ts_beacon; 4197 sdata->vif.bss_conf.sync_dtim_count = dtim_count; 4198 } 4199 } else { 4200 assoc_data->timeout = jiffies; 4201 assoc_data->timeout_started = true; 4202 } 4203 rcu_read_unlock(); 4204 4205 run_again(ifmgd, assoc_data->timeout); 4206 4207 if (bss->corrupt_data) { 4208 char *corrupt_type = "data"; 4209 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { 4210 if (bss->corrupt_data & 4211 IEEE80211_BSS_CORRUPT_PROBE_RESP) 4212 corrupt_type = "beacon and probe response"; 4213 else 4214 corrupt_type = "beacon"; 4215 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) 4216 corrupt_type = "probe response"; 4217 sdata_info(sdata, "associating with AP with corrupt %s\n", 4218 corrupt_type); 4219 } 4220 4221 err = 0; 4222 goto out; 4223 err_clear: 4224 memset(ifmgd->bssid, 0, ETH_ALEN); 4225 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); 4226 ifmgd->assoc_data = NULL; 4227 err_free: 4228 kfree(assoc_data); 4229 out: 4230 mutex_unlock(&ifmgd->mtx); 4231 4232 return err; 4233 } 4234 4235 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, 4236 struct cfg80211_deauth_request *req) 4237 { 4238 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4239 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4240 bool tx = !req->local_state_change; 4241 bool sent_frame = false; 4242 4243 mutex_lock(&ifmgd->mtx); 4244 4245 sdata_info(sdata, 4246 "deauthenticating from %pM by local choice (reason=%d)\n", 4247 req->bssid, req->reason_code); 4248 4249 if (ifmgd->auth_data) { 4250 drv_mgd_prepare_tx(sdata->local, sdata); 4251 ieee80211_send_deauth_disassoc(sdata, req->bssid, 4252 IEEE80211_STYPE_DEAUTH, 4253 req->reason_code, tx, 4254 frame_buf); 4255 ieee80211_destroy_auth_data(sdata, false); 4256 mutex_unlock(&ifmgd->mtx); 4257 4258 sent_frame = tx; 4259 goto out; 4260 } 4261 4262 if (ifmgd->associated && 4263 ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { 4264 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, 4265 req->reason_code, tx, frame_buf); 4266 sent_frame = tx; 4267 } 4268 mutex_unlock(&ifmgd->mtx); 4269 4270 out: 4271 if (sent_frame) 4272 __cfg80211_send_deauth(sdata->dev, frame_buf, 4273 IEEE80211_DEAUTH_FRAME_LEN); 4274 4275 return 0; 4276 } 4277 4278 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, 4279 struct cfg80211_disassoc_request *req) 4280 { 4281 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4282 u8 bssid[ETH_ALEN]; 4283 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 4284 4285 mutex_lock(&ifmgd->mtx); 4286 4287 /* 4288 * cfg80211 should catch this ... but it's racy since 4289 * we can receive a disassoc frame, process it, hand it 4290 * to cfg80211 while that's in a locked section already 4291 * trying to tell us that the user wants to disconnect. 4292 */ 4293 if (ifmgd->associated != req->bss) { 4294 mutex_unlock(&ifmgd->mtx); 4295 return -ENOLINK; 4296 } 4297 4298 sdata_info(sdata, 4299 "disassociating from %pM by local choice (reason=%d)\n", 4300 req->bss->bssid, req->reason_code); 4301 4302 memcpy(bssid, req->bss->bssid, ETH_ALEN); 4303 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, 4304 req->reason_code, !req->local_state_change, 4305 frame_buf); 4306 mutex_unlock(&ifmgd->mtx); 4307 4308 __cfg80211_send_disassoc(sdata->dev, frame_buf, 4309 IEEE80211_DEAUTH_FRAME_LEN); 4310 4311 return 0; 4312 } 4313 4314 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) 4315 { 4316 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 4317 4318 mutex_lock(&ifmgd->mtx); 4319 if (ifmgd->assoc_data) 4320 ieee80211_destroy_assoc_data(sdata, false); 4321 if (ifmgd->auth_data) 4322 ieee80211_destroy_auth_data(sdata, false); 4323 del_timer_sync(&ifmgd->timer); 4324 mutex_unlock(&ifmgd->mtx); 4325 } 4326 4327 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 4328 enum nl80211_cqm_rssi_threshold_event rssi_event, 4329 gfp_t gfp) 4330 { 4331 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4332 4333 trace_api_cqm_rssi_notify(sdata, rssi_event); 4334 4335 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); 4336 } 4337 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify); 4338