1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * utilities for mac80211 12 */ 13 14 #include <net/mac80211.h> 15 #include <linux/netdevice.h> 16 #include <linux/export.h> 17 #include <linux/types.h> 18 #include <linux/slab.h> 19 #include <linux/skbuff.h> 20 #include <linux/etherdevice.h> 21 #include <linux/if_arp.h> 22 #include <linux/bitmap.h> 23 #include <linux/crc32.h> 24 #include <net/net_namespace.h> 25 #include <net/cfg80211.h> 26 #include <net/rtnetlink.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "rate.h" 31 #include "mesh.h" 32 #include "wme.h" 33 #include "led.h" 34 #include "wep.h" 35 36 /* privid for wiphys to determine whether they belong to us or not */ 37 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid; 38 39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy) 40 { 41 struct ieee80211_local *local; 42 BUG_ON(!wiphy); 43 44 local = wiphy_priv(wiphy); 45 return &local->hw; 46 } 47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw); 48 49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, 50 enum nl80211_iftype type) 51 { 52 __le16 fc = hdr->frame_control; 53 54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ 55 if (len < 16) 56 return NULL; 57 58 if (ieee80211_is_data(fc)) { 59 if (len < 24) /* drop incorrect hdr len (data) */ 60 return NULL; 61 62 if (ieee80211_has_a4(fc)) 63 return NULL; 64 if (ieee80211_has_tods(fc)) 65 return hdr->addr1; 66 if (ieee80211_has_fromds(fc)) 67 return hdr->addr2; 68 69 return hdr->addr3; 70 } 71 72 if (ieee80211_is_mgmt(fc)) { 73 if (len < 24) /* drop incorrect hdr len (mgmt) */ 74 return NULL; 75 return hdr->addr3; 76 } 77 78 if (ieee80211_is_ctl(fc)) { 79 if (ieee80211_is_pspoll(fc)) 80 return hdr->addr1; 81 82 if (ieee80211_is_back_req(fc)) { 83 switch (type) { 84 case NL80211_IFTYPE_STATION: 85 return hdr->addr2; 86 case NL80211_IFTYPE_AP: 87 case NL80211_IFTYPE_AP_VLAN: 88 return hdr->addr1; 89 default: 90 break; /* fall through to the return */ 91 } 92 } 93 } 94 95 return NULL; 96 } 97 98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx) 99 { 100 struct sk_buff *skb; 101 struct ieee80211_hdr *hdr; 102 103 skb_queue_walk(&tx->skbs, skb) { 104 hdr = (struct ieee80211_hdr *) skb->data; 105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 106 } 107 } 108 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len, 110 int rate, int erp, int short_preamble, 111 int shift) 112 { 113 int dur; 114 115 /* calculate duration (in microseconds, rounded up to next higher 116 * integer if it includes a fractional microsecond) to send frame of 117 * len bytes (does not include FCS) at the given rate. Duration will 118 * also include SIFS. 119 * 120 * rate is in 100 kbps, so divident is multiplied by 10 in the 121 * DIV_ROUND_UP() operations. 122 * 123 * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and 124 * is assumed to be 0 otherwise. 125 */ 126 127 if (band == IEEE80211_BAND_5GHZ || erp) { 128 /* 129 * OFDM: 130 * 131 * N_DBPS = DATARATE x 4 132 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS) 133 * (16 = SIGNAL time, 6 = tail bits) 134 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext 135 * 136 * T_SYM = 4 usec 137 * 802.11a - 18.5.2: aSIFSTime = 16 usec 138 * 802.11g - 19.8.4: aSIFSTime = 10 usec + 139 * signal ext = 6 usec 140 */ 141 dur = 16; /* SIFS + signal ext */ 142 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */ 143 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */ 144 145 /* IEEE 802.11-2012 18.3.2.4: all values above are: 146 * * times 4 for 5 MHz 147 * * times 2 for 10 MHz 148 */ 149 dur *= 1 << shift; 150 151 /* rates should already consider the channel bandwidth, 152 * don't apply divisor again. 153 */ 154 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10, 155 4 * rate); /* T_SYM x N_SYM */ 156 } else { 157 /* 158 * 802.11b or 802.11g with 802.11b compatibility: 159 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime + 160 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0. 161 * 162 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4 163 * aSIFSTime = 10 usec 164 * aPreambleLength = 144 usec or 72 usec with short preamble 165 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble 166 */ 167 dur = 10; /* aSIFSTime = 10 usec */ 168 dur += short_preamble ? (72 + 24) : (144 + 48); 169 170 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate); 171 } 172 173 return dur; 174 } 175 176 /* Exported duration function for driver use */ 177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, 178 struct ieee80211_vif *vif, 179 enum ieee80211_band band, 180 size_t frame_len, 181 struct ieee80211_rate *rate) 182 { 183 struct ieee80211_sub_if_data *sdata; 184 u16 dur; 185 int erp, shift = 0; 186 bool short_preamble = false; 187 188 erp = 0; 189 if (vif) { 190 sdata = vif_to_sdata(vif); 191 short_preamble = sdata->vif.bss_conf.use_short_preamble; 192 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 193 erp = rate->flags & IEEE80211_RATE_ERP_G; 194 shift = ieee80211_vif_get_shift(vif); 195 } 196 197 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp, 198 short_preamble, shift); 199 200 return cpu_to_le16(dur); 201 } 202 EXPORT_SYMBOL(ieee80211_generic_frame_duration); 203 204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, 205 struct ieee80211_vif *vif, size_t frame_len, 206 const struct ieee80211_tx_info *frame_txctl) 207 { 208 struct ieee80211_local *local = hw_to_local(hw); 209 struct ieee80211_rate *rate; 210 struct ieee80211_sub_if_data *sdata; 211 bool short_preamble; 212 int erp, shift = 0, bitrate; 213 u16 dur; 214 struct ieee80211_supported_band *sband; 215 216 sband = local->hw.wiphy->bands[frame_txctl->band]; 217 218 short_preamble = false; 219 220 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 221 222 erp = 0; 223 if (vif) { 224 sdata = vif_to_sdata(vif); 225 short_preamble = sdata->vif.bss_conf.use_short_preamble; 226 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 227 erp = rate->flags & IEEE80211_RATE_ERP_G; 228 shift = ieee80211_vif_get_shift(vif); 229 } 230 231 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift); 232 233 /* CTS duration */ 234 dur = ieee80211_frame_duration(sband->band, 10, bitrate, 235 erp, short_preamble, shift); 236 /* Data frame duration */ 237 dur += ieee80211_frame_duration(sband->band, frame_len, bitrate, 238 erp, short_preamble, shift); 239 /* ACK duration */ 240 dur += ieee80211_frame_duration(sband->band, 10, bitrate, 241 erp, short_preamble, shift); 242 243 return cpu_to_le16(dur); 244 } 245 EXPORT_SYMBOL(ieee80211_rts_duration); 246 247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, 248 struct ieee80211_vif *vif, 249 size_t frame_len, 250 const struct ieee80211_tx_info *frame_txctl) 251 { 252 struct ieee80211_local *local = hw_to_local(hw); 253 struct ieee80211_rate *rate; 254 struct ieee80211_sub_if_data *sdata; 255 bool short_preamble; 256 int erp, shift = 0, bitrate; 257 u16 dur; 258 struct ieee80211_supported_band *sband; 259 260 sband = local->hw.wiphy->bands[frame_txctl->band]; 261 262 short_preamble = false; 263 264 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 265 erp = 0; 266 if (vif) { 267 sdata = vif_to_sdata(vif); 268 short_preamble = sdata->vif.bss_conf.use_short_preamble; 269 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 270 erp = rate->flags & IEEE80211_RATE_ERP_G; 271 shift = ieee80211_vif_get_shift(vif); 272 } 273 274 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift); 275 276 /* Data frame duration */ 277 dur = ieee80211_frame_duration(sband->band, frame_len, bitrate, 278 erp, short_preamble, shift); 279 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) { 280 /* ACK duration */ 281 dur += ieee80211_frame_duration(sband->band, 10, bitrate, 282 erp, short_preamble, shift); 283 } 284 285 return cpu_to_le16(dur); 286 } 287 EXPORT_SYMBOL(ieee80211_ctstoself_duration); 288 289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue) 290 { 291 struct ieee80211_sub_if_data *sdata; 292 int n_acs = IEEE80211_NUM_ACS; 293 294 if (local->hw.queues < IEEE80211_NUM_ACS) 295 n_acs = 1; 296 297 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 298 int ac; 299 300 if (!sdata->dev) 301 continue; 302 303 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE && 304 local->queue_stop_reasons[sdata->vif.cab_queue] != 0) 305 continue; 306 307 for (ac = 0; ac < n_acs; ac++) { 308 int ac_queue = sdata->vif.hw_queue[ac]; 309 310 if (ac_queue == queue || 311 (sdata->vif.cab_queue == queue && 312 local->queue_stop_reasons[ac_queue] == 0 && 313 skb_queue_empty(&local->pending[ac_queue]))) 314 netif_wake_subqueue(sdata->dev, ac); 315 } 316 } 317 } 318 319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, 320 enum queue_stop_reason reason, 321 bool refcounted) 322 { 323 struct ieee80211_local *local = hw_to_local(hw); 324 325 trace_wake_queue(local, queue, reason); 326 327 if (WARN_ON(queue >= hw->queues)) 328 return; 329 330 if (!test_bit(reason, &local->queue_stop_reasons[queue])) 331 return; 332 333 if (!refcounted) 334 local->q_stop_reasons[queue][reason] = 0; 335 else 336 local->q_stop_reasons[queue][reason]--; 337 338 if (local->q_stop_reasons[queue][reason] == 0) 339 __clear_bit(reason, &local->queue_stop_reasons[queue]); 340 341 if (local->queue_stop_reasons[queue] != 0) 342 /* someone still has this queue stopped */ 343 return; 344 345 if (skb_queue_empty(&local->pending[queue])) { 346 rcu_read_lock(); 347 ieee80211_propagate_queue_wake(local, queue); 348 rcu_read_unlock(); 349 } else 350 tasklet_schedule(&local->tx_pending_tasklet); 351 } 352 353 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue, 354 enum queue_stop_reason reason, 355 bool refcounted) 356 { 357 struct ieee80211_local *local = hw_to_local(hw); 358 unsigned long flags; 359 360 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 361 __ieee80211_wake_queue(hw, queue, reason, refcounted); 362 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 363 } 364 365 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue) 366 { 367 ieee80211_wake_queue_by_reason(hw, queue, 368 IEEE80211_QUEUE_STOP_REASON_DRIVER, 369 false); 370 } 371 EXPORT_SYMBOL(ieee80211_wake_queue); 372 373 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue, 374 enum queue_stop_reason reason, 375 bool refcounted) 376 { 377 struct ieee80211_local *local = hw_to_local(hw); 378 struct ieee80211_sub_if_data *sdata; 379 int n_acs = IEEE80211_NUM_ACS; 380 381 trace_stop_queue(local, queue, reason); 382 383 if (WARN_ON(queue >= hw->queues)) 384 return; 385 386 if (!refcounted) 387 local->q_stop_reasons[queue][reason] = 1; 388 else 389 local->q_stop_reasons[queue][reason]++; 390 391 if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue])) 392 return; 393 394 if (local->hw.queues < IEEE80211_NUM_ACS) 395 n_acs = 1; 396 397 rcu_read_lock(); 398 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 399 int ac; 400 401 if (!sdata->dev) 402 continue; 403 404 for (ac = 0; ac < n_acs; ac++) { 405 if (sdata->vif.hw_queue[ac] == queue || 406 sdata->vif.cab_queue == queue) 407 netif_stop_subqueue(sdata->dev, ac); 408 } 409 } 410 rcu_read_unlock(); 411 } 412 413 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue, 414 enum queue_stop_reason reason, 415 bool refcounted) 416 { 417 struct ieee80211_local *local = hw_to_local(hw); 418 unsigned long flags; 419 420 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 421 __ieee80211_stop_queue(hw, queue, reason, refcounted); 422 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 423 } 424 425 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue) 426 { 427 ieee80211_stop_queue_by_reason(hw, queue, 428 IEEE80211_QUEUE_STOP_REASON_DRIVER, 429 false); 430 } 431 EXPORT_SYMBOL(ieee80211_stop_queue); 432 433 void ieee80211_add_pending_skb(struct ieee80211_local *local, 434 struct sk_buff *skb) 435 { 436 struct ieee80211_hw *hw = &local->hw; 437 unsigned long flags; 438 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 439 int queue = info->hw_queue; 440 441 if (WARN_ON(!info->control.vif)) { 442 ieee80211_free_txskb(&local->hw, skb); 443 return; 444 } 445 446 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 447 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD, 448 false); 449 __skb_queue_tail(&local->pending[queue], skb); 450 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD, 451 false); 452 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 453 } 454 455 void ieee80211_add_pending_skbs(struct ieee80211_local *local, 456 struct sk_buff_head *skbs) 457 { 458 struct ieee80211_hw *hw = &local->hw; 459 struct sk_buff *skb; 460 unsigned long flags; 461 int queue, i; 462 463 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 464 while ((skb = skb_dequeue(skbs))) { 465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 466 467 if (WARN_ON(!info->control.vif)) { 468 ieee80211_free_txskb(&local->hw, skb); 469 continue; 470 } 471 472 queue = info->hw_queue; 473 474 __ieee80211_stop_queue(hw, queue, 475 IEEE80211_QUEUE_STOP_REASON_SKB_ADD, 476 false); 477 478 __skb_queue_tail(&local->pending[queue], skb); 479 } 480 481 for (i = 0; i < hw->queues; i++) 482 __ieee80211_wake_queue(hw, i, 483 IEEE80211_QUEUE_STOP_REASON_SKB_ADD, 484 false); 485 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 486 } 487 488 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw, 489 unsigned long queues, 490 enum queue_stop_reason reason, 491 bool refcounted) 492 { 493 struct ieee80211_local *local = hw_to_local(hw); 494 unsigned long flags; 495 int i; 496 497 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 498 499 for_each_set_bit(i, &queues, hw->queues) 500 __ieee80211_stop_queue(hw, i, reason, refcounted); 501 502 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 503 } 504 505 void ieee80211_stop_queues(struct ieee80211_hw *hw) 506 { 507 ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP, 508 IEEE80211_QUEUE_STOP_REASON_DRIVER, 509 false); 510 } 511 EXPORT_SYMBOL(ieee80211_stop_queues); 512 513 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue) 514 { 515 struct ieee80211_local *local = hw_to_local(hw); 516 unsigned long flags; 517 int ret; 518 519 if (WARN_ON(queue >= hw->queues)) 520 return true; 521 522 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 523 ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER, 524 &local->queue_stop_reasons[queue]); 525 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 526 return ret; 527 } 528 EXPORT_SYMBOL(ieee80211_queue_stopped); 529 530 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw, 531 unsigned long queues, 532 enum queue_stop_reason reason, 533 bool refcounted) 534 { 535 struct ieee80211_local *local = hw_to_local(hw); 536 unsigned long flags; 537 int i; 538 539 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 540 541 for_each_set_bit(i, &queues, hw->queues) 542 __ieee80211_wake_queue(hw, i, reason, refcounted); 543 544 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 545 } 546 547 void ieee80211_wake_queues(struct ieee80211_hw *hw) 548 { 549 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP, 550 IEEE80211_QUEUE_STOP_REASON_DRIVER, 551 false); 552 } 553 EXPORT_SYMBOL(ieee80211_wake_queues); 554 555 static unsigned int 556 ieee80211_get_vif_queues(struct ieee80211_local *local, 557 struct ieee80211_sub_if_data *sdata) 558 { 559 unsigned int queues; 560 561 if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 562 int ac; 563 564 queues = 0; 565 566 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 567 queues |= BIT(sdata->vif.hw_queue[ac]); 568 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE) 569 queues |= BIT(sdata->vif.cab_queue); 570 } else { 571 /* all queues */ 572 queues = BIT(local->hw.queues) - 1; 573 } 574 575 return queues; 576 } 577 578 void ieee80211_flush_queues(struct ieee80211_local *local, 579 struct ieee80211_sub_if_data *sdata) 580 { 581 unsigned int queues; 582 583 if (!local->ops->flush) 584 return; 585 586 queues = ieee80211_get_vif_queues(local, sdata); 587 588 ieee80211_stop_queues_by_reason(&local->hw, queues, 589 IEEE80211_QUEUE_STOP_REASON_FLUSH, 590 false); 591 592 drv_flush(local, sdata, queues, false); 593 594 ieee80211_wake_queues_by_reason(&local->hw, queues, 595 IEEE80211_QUEUE_STOP_REASON_FLUSH, 596 false); 597 } 598 599 void ieee80211_stop_vif_queues(struct ieee80211_local *local, 600 struct ieee80211_sub_if_data *sdata, 601 enum queue_stop_reason reason) 602 { 603 ieee80211_stop_queues_by_reason(&local->hw, 604 ieee80211_get_vif_queues(local, sdata), 605 reason, true); 606 } 607 608 void ieee80211_wake_vif_queues(struct ieee80211_local *local, 609 struct ieee80211_sub_if_data *sdata, 610 enum queue_stop_reason reason) 611 { 612 ieee80211_wake_queues_by_reason(&local->hw, 613 ieee80211_get_vif_queues(local, sdata), 614 reason, true); 615 } 616 617 static void __iterate_active_interfaces(struct ieee80211_local *local, 618 u32 iter_flags, 619 void (*iterator)(void *data, u8 *mac, 620 struct ieee80211_vif *vif), 621 void *data) 622 { 623 struct ieee80211_sub_if_data *sdata; 624 625 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 626 switch (sdata->vif.type) { 627 case NL80211_IFTYPE_MONITOR: 628 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE)) 629 continue; 630 break; 631 case NL80211_IFTYPE_AP_VLAN: 632 continue; 633 default: 634 break; 635 } 636 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) && 637 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER)) 638 continue; 639 if (ieee80211_sdata_running(sdata)) 640 iterator(data, sdata->vif.addr, 641 &sdata->vif); 642 } 643 644 sdata = rcu_dereference_check(local->monitor_sdata, 645 lockdep_is_held(&local->iflist_mtx) || 646 lockdep_rtnl_is_held()); 647 if (sdata && 648 (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || 649 sdata->flags & IEEE80211_SDATA_IN_DRIVER)) 650 iterator(data, sdata->vif.addr, &sdata->vif); 651 } 652 653 void ieee80211_iterate_active_interfaces( 654 struct ieee80211_hw *hw, u32 iter_flags, 655 void (*iterator)(void *data, u8 *mac, 656 struct ieee80211_vif *vif), 657 void *data) 658 { 659 struct ieee80211_local *local = hw_to_local(hw); 660 661 mutex_lock(&local->iflist_mtx); 662 __iterate_active_interfaces(local, iter_flags, iterator, data); 663 mutex_unlock(&local->iflist_mtx); 664 } 665 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces); 666 667 void ieee80211_iterate_active_interfaces_atomic( 668 struct ieee80211_hw *hw, u32 iter_flags, 669 void (*iterator)(void *data, u8 *mac, 670 struct ieee80211_vif *vif), 671 void *data) 672 { 673 struct ieee80211_local *local = hw_to_local(hw); 674 675 rcu_read_lock(); 676 __iterate_active_interfaces(local, iter_flags, iterator, data); 677 rcu_read_unlock(); 678 } 679 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic); 680 681 void ieee80211_iterate_active_interfaces_rtnl( 682 struct ieee80211_hw *hw, u32 iter_flags, 683 void (*iterator)(void *data, u8 *mac, 684 struct ieee80211_vif *vif), 685 void *data) 686 { 687 struct ieee80211_local *local = hw_to_local(hw); 688 689 ASSERT_RTNL(); 690 691 __iterate_active_interfaces(local, iter_flags, iterator, data); 692 } 693 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl); 694 695 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev) 696 { 697 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); 698 699 if (!ieee80211_sdata_running(sdata) || 700 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER)) 701 return NULL; 702 return &sdata->vif; 703 } 704 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif); 705 706 /* 707 * Nothing should have been stuffed into the workqueue during 708 * the suspend->resume cycle. If this WARN is seen then there 709 * is a bug with either the driver suspend or something in 710 * mac80211 stuffing into the workqueue which we haven't yet 711 * cleared during mac80211's suspend cycle. 712 */ 713 static bool ieee80211_can_queue_work(struct ieee80211_local *local) 714 { 715 if (WARN(local->suspended && !local->resuming, 716 "queueing ieee80211 work while going to suspend\n")) 717 return false; 718 719 return true; 720 } 721 722 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work) 723 { 724 struct ieee80211_local *local = hw_to_local(hw); 725 726 if (!ieee80211_can_queue_work(local)) 727 return; 728 729 queue_work(local->workqueue, work); 730 } 731 EXPORT_SYMBOL(ieee80211_queue_work); 732 733 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw, 734 struct delayed_work *dwork, 735 unsigned long delay) 736 { 737 struct ieee80211_local *local = hw_to_local(hw); 738 739 if (!ieee80211_can_queue_work(local)) 740 return; 741 742 queue_delayed_work(local->workqueue, dwork, delay); 743 } 744 EXPORT_SYMBOL(ieee80211_queue_delayed_work); 745 746 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, 747 struct ieee802_11_elems *elems, 748 u64 filter, u32 crc) 749 { 750 size_t left = len; 751 const u8 *pos = start; 752 bool calc_crc = filter != 0; 753 DECLARE_BITMAP(seen_elems, 256); 754 const u8 *ie; 755 756 bitmap_zero(seen_elems, 256); 757 memset(elems, 0, sizeof(*elems)); 758 elems->ie_start = start; 759 elems->total_len = len; 760 761 while (left >= 2) { 762 u8 id, elen; 763 bool elem_parse_failed; 764 765 id = *pos++; 766 elen = *pos++; 767 left -= 2; 768 769 if (elen > left) { 770 elems->parse_error = true; 771 break; 772 } 773 774 switch (id) { 775 case WLAN_EID_SSID: 776 case WLAN_EID_SUPP_RATES: 777 case WLAN_EID_FH_PARAMS: 778 case WLAN_EID_DS_PARAMS: 779 case WLAN_EID_CF_PARAMS: 780 case WLAN_EID_TIM: 781 case WLAN_EID_IBSS_PARAMS: 782 case WLAN_EID_CHALLENGE: 783 case WLAN_EID_RSN: 784 case WLAN_EID_ERP_INFO: 785 case WLAN_EID_EXT_SUPP_RATES: 786 case WLAN_EID_HT_CAPABILITY: 787 case WLAN_EID_HT_OPERATION: 788 case WLAN_EID_VHT_CAPABILITY: 789 case WLAN_EID_VHT_OPERATION: 790 case WLAN_EID_MESH_ID: 791 case WLAN_EID_MESH_CONFIG: 792 case WLAN_EID_PEER_MGMT: 793 case WLAN_EID_PREQ: 794 case WLAN_EID_PREP: 795 case WLAN_EID_PERR: 796 case WLAN_EID_RANN: 797 case WLAN_EID_CHANNEL_SWITCH: 798 case WLAN_EID_EXT_CHANSWITCH_ANN: 799 case WLAN_EID_COUNTRY: 800 case WLAN_EID_PWR_CONSTRAINT: 801 case WLAN_EID_TIMEOUT_INTERVAL: 802 case WLAN_EID_SECONDARY_CHANNEL_OFFSET: 803 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH: 804 case WLAN_EID_CHAN_SWITCH_PARAM: 805 /* 806 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible 807 * that if the content gets bigger it might be needed more than once 808 */ 809 if (test_bit(id, seen_elems)) { 810 elems->parse_error = true; 811 left -= elen; 812 pos += elen; 813 continue; 814 } 815 break; 816 } 817 818 if (calc_crc && id < 64 && (filter & (1ULL << id))) 819 crc = crc32_be(crc, pos - 2, elen + 2); 820 821 elem_parse_failed = false; 822 823 switch (id) { 824 case WLAN_EID_SSID: 825 elems->ssid = pos; 826 elems->ssid_len = elen; 827 break; 828 case WLAN_EID_SUPP_RATES: 829 elems->supp_rates = pos; 830 elems->supp_rates_len = elen; 831 break; 832 case WLAN_EID_DS_PARAMS: 833 if (elen >= 1) 834 elems->ds_params = pos; 835 else 836 elem_parse_failed = true; 837 break; 838 case WLAN_EID_TIM: 839 if (elen >= sizeof(struct ieee80211_tim_ie)) { 840 elems->tim = (void *)pos; 841 elems->tim_len = elen; 842 } else 843 elem_parse_failed = true; 844 break; 845 case WLAN_EID_CHALLENGE: 846 elems->challenge = pos; 847 elems->challenge_len = elen; 848 break; 849 case WLAN_EID_VENDOR_SPECIFIC: 850 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && 851 pos[2] == 0xf2) { 852 /* Microsoft OUI (00:50:F2) */ 853 854 if (calc_crc) 855 crc = crc32_be(crc, pos - 2, elen + 2); 856 857 if (elen >= 5 && pos[3] == 2) { 858 /* OUI Type 2 - WMM IE */ 859 if (pos[4] == 0) { 860 elems->wmm_info = pos; 861 elems->wmm_info_len = elen; 862 } else if (pos[4] == 1) { 863 elems->wmm_param = pos; 864 elems->wmm_param_len = elen; 865 } 866 } 867 } 868 break; 869 case WLAN_EID_RSN: 870 elems->rsn = pos; 871 elems->rsn_len = elen; 872 break; 873 case WLAN_EID_ERP_INFO: 874 if (elen >= 1) 875 elems->erp_info = pos; 876 else 877 elem_parse_failed = true; 878 break; 879 case WLAN_EID_EXT_SUPP_RATES: 880 elems->ext_supp_rates = pos; 881 elems->ext_supp_rates_len = elen; 882 break; 883 case WLAN_EID_HT_CAPABILITY: 884 if (elen >= sizeof(struct ieee80211_ht_cap)) 885 elems->ht_cap_elem = (void *)pos; 886 else 887 elem_parse_failed = true; 888 break; 889 case WLAN_EID_HT_OPERATION: 890 if (elen >= sizeof(struct ieee80211_ht_operation)) 891 elems->ht_operation = (void *)pos; 892 else 893 elem_parse_failed = true; 894 break; 895 case WLAN_EID_VHT_CAPABILITY: 896 if (elen >= sizeof(struct ieee80211_vht_cap)) 897 elems->vht_cap_elem = (void *)pos; 898 else 899 elem_parse_failed = true; 900 break; 901 case WLAN_EID_VHT_OPERATION: 902 if (elen >= sizeof(struct ieee80211_vht_operation)) 903 elems->vht_operation = (void *)pos; 904 else 905 elem_parse_failed = true; 906 break; 907 case WLAN_EID_OPMODE_NOTIF: 908 if (elen > 0) 909 elems->opmode_notif = pos; 910 else 911 elem_parse_failed = true; 912 break; 913 case WLAN_EID_MESH_ID: 914 elems->mesh_id = pos; 915 elems->mesh_id_len = elen; 916 break; 917 case WLAN_EID_MESH_CONFIG: 918 if (elen >= sizeof(struct ieee80211_meshconf_ie)) 919 elems->mesh_config = (void *)pos; 920 else 921 elem_parse_failed = true; 922 break; 923 case WLAN_EID_PEER_MGMT: 924 elems->peering = pos; 925 elems->peering_len = elen; 926 break; 927 case WLAN_EID_MESH_AWAKE_WINDOW: 928 if (elen >= 2) 929 elems->awake_window = (void *)pos; 930 break; 931 case WLAN_EID_PREQ: 932 elems->preq = pos; 933 elems->preq_len = elen; 934 break; 935 case WLAN_EID_PREP: 936 elems->prep = pos; 937 elems->prep_len = elen; 938 break; 939 case WLAN_EID_PERR: 940 elems->perr = pos; 941 elems->perr_len = elen; 942 break; 943 case WLAN_EID_RANN: 944 if (elen >= sizeof(struct ieee80211_rann_ie)) 945 elems->rann = (void *)pos; 946 else 947 elem_parse_failed = true; 948 break; 949 case WLAN_EID_CHANNEL_SWITCH: 950 if (elen != sizeof(struct ieee80211_channel_sw_ie)) { 951 elem_parse_failed = true; 952 break; 953 } 954 elems->ch_switch_ie = (void *)pos; 955 break; 956 case WLAN_EID_EXT_CHANSWITCH_ANN: 957 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) { 958 elem_parse_failed = true; 959 break; 960 } 961 elems->ext_chansw_ie = (void *)pos; 962 break; 963 case WLAN_EID_SECONDARY_CHANNEL_OFFSET: 964 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) { 965 elem_parse_failed = true; 966 break; 967 } 968 elems->sec_chan_offs = (void *)pos; 969 break; 970 case WLAN_EID_CHAN_SWITCH_PARAM: 971 if (elen != 972 sizeof(*elems->mesh_chansw_params_ie)) { 973 elem_parse_failed = true; 974 break; 975 } 976 elems->mesh_chansw_params_ie = (void *)pos; 977 break; 978 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH: 979 if (!action || 980 elen != sizeof(*elems->wide_bw_chansw_ie)) { 981 elem_parse_failed = true; 982 break; 983 } 984 elems->wide_bw_chansw_ie = (void *)pos; 985 break; 986 case WLAN_EID_CHANNEL_SWITCH_WRAPPER: 987 if (action) { 988 elem_parse_failed = true; 989 break; 990 } 991 /* 992 * This is a bit tricky, but as we only care about 993 * the wide bandwidth channel switch element, so 994 * just parse it out manually. 995 */ 996 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH, 997 pos, elen); 998 if (ie) { 999 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie)) 1000 elems->wide_bw_chansw_ie = 1001 (void *)(ie + 2); 1002 else 1003 elem_parse_failed = true; 1004 } 1005 break; 1006 case WLAN_EID_COUNTRY: 1007 elems->country_elem = pos; 1008 elems->country_elem_len = elen; 1009 break; 1010 case WLAN_EID_PWR_CONSTRAINT: 1011 if (elen != 1) { 1012 elem_parse_failed = true; 1013 break; 1014 } 1015 elems->pwr_constr_elem = pos; 1016 break; 1017 case WLAN_EID_TIMEOUT_INTERVAL: 1018 if (elen >= sizeof(struct ieee80211_timeout_interval_ie)) 1019 elems->timeout_int = (void *)pos; 1020 else 1021 elem_parse_failed = true; 1022 break; 1023 default: 1024 break; 1025 } 1026 1027 if (elem_parse_failed) 1028 elems->parse_error = true; 1029 else 1030 __set_bit(id, seen_elems); 1031 1032 left -= elen; 1033 pos += elen; 1034 } 1035 1036 if (left != 0) 1037 elems->parse_error = true; 1038 1039 return crc; 1040 } 1041 1042 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata, 1043 bool bss_notify) 1044 { 1045 struct ieee80211_local *local = sdata->local; 1046 struct ieee80211_tx_queue_params qparam; 1047 struct ieee80211_chanctx_conf *chanctx_conf; 1048 int ac; 1049 bool use_11b, enable_qos; 1050 int aCWmin, aCWmax; 1051 1052 if (!local->ops->conf_tx) 1053 return; 1054 1055 if (local->hw.queues < IEEE80211_NUM_ACS) 1056 return; 1057 1058 memset(&qparam, 0, sizeof(qparam)); 1059 1060 rcu_read_lock(); 1061 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1062 use_11b = (chanctx_conf && 1063 chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) && 1064 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE); 1065 rcu_read_unlock(); 1066 1067 /* 1068 * By default disable QoS in STA mode for old access points, which do 1069 * not support 802.11e. New APs will provide proper queue parameters, 1070 * that we will configure later. 1071 */ 1072 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION); 1073 1074 /* Set defaults according to 802.11-2007 Table 7-37 */ 1075 aCWmax = 1023; 1076 if (use_11b) 1077 aCWmin = 31; 1078 else 1079 aCWmin = 15; 1080 1081 /* Confiure old 802.11b/g medium access rules. */ 1082 qparam.cw_max = aCWmax; 1083 qparam.cw_min = aCWmin; 1084 qparam.txop = 0; 1085 qparam.aifs = 2; 1086 1087 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 1088 /* Update if QoS is enabled. */ 1089 if (enable_qos) { 1090 switch (ac) { 1091 case IEEE80211_AC_BK: 1092 qparam.cw_max = aCWmax; 1093 qparam.cw_min = aCWmin; 1094 qparam.txop = 0; 1095 qparam.aifs = 7; 1096 break; 1097 /* never happens but let's not leave undefined */ 1098 default: 1099 case IEEE80211_AC_BE: 1100 qparam.cw_max = aCWmax; 1101 qparam.cw_min = aCWmin; 1102 qparam.txop = 0; 1103 qparam.aifs = 3; 1104 break; 1105 case IEEE80211_AC_VI: 1106 qparam.cw_max = aCWmin; 1107 qparam.cw_min = (aCWmin + 1) / 2 - 1; 1108 if (use_11b) 1109 qparam.txop = 6016/32; 1110 else 1111 qparam.txop = 3008/32; 1112 qparam.aifs = 2; 1113 break; 1114 case IEEE80211_AC_VO: 1115 qparam.cw_max = (aCWmin + 1) / 2 - 1; 1116 qparam.cw_min = (aCWmin + 1) / 4 - 1; 1117 if (use_11b) 1118 qparam.txop = 3264/32; 1119 else 1120 qparam.txop = 1504/32; 1121 qparam.aifs = 2; 1122 break; 1123 } 1124 } 1125 1126 qparam.uapsd = false; 1127 1128 sdata->tx_conf[ac] = qparam; 1129 drv_conf_tx(local, sdata, ac, &qparam); 1130 } 1131 1132 if (sdata->vif.type != NL80211_IFTYPE_MONITOR && 1133 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) { 1134 sdata->vif.bss_conf.qos = enable_qos; 1135 if (bss_notify) 1136 ieee80211_bss_info_change_notify(sdata, 1137 BSS_CHANGED_QOS); 1138 } 1139 } 1140 1141 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, 1142 u16 transaction, u16 auth_alg, u16 status, 1143 const u8 *extra, size_t extra_len, const u8 *da, 1144 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx, 1145 u32 tx_flags) 1146 { 1147 struct ieee80211_local *local = sdata->local; 1148 struct sk_buff *skb; 1149 struct ieee80211_mgmt *mgmt; 1150 int err; 1151 1152 /* 24 + 6 = header + auth_algo + auth_transaction + status_code */ 1153 skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN + 1154 24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN); 1155 if (!skb) 1156 return; 1157 1158 skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN); 1159 1160 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); 1161 memset(mgmt, 0, 24 + 6); 1162 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1163 IEEE80211_STYPE_AUTH); 1164 memcpy(mgmt->da, da, ETH_ALEN); 1165 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 1166 memcpy(mgmt->bssid, bssid, ETH_ALEN); 1167 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg); 1168 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); 1169 mgmt->u.auth.status_code = cpu_to_le16(status); 1170 if (extra) 1171 memcpy(skb_put(skb, extra_len), extra, extra_len); 1172 1173 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) { 1174 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 1175 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx); 1176 WARN_ON(err); 1177 } 1178 1179 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1180 tx_flags; 1181 ieee80211_tx_skb(sdata, skb); 1182 } 1183 1184 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 1185 const u8 *bssid, u16 stype, u16 reason, 1186 bool send_frame, u8 *frame_buf) 1187 { 1188 struct ieee80211_local *local = sdata->local; 1189 struct sk_buff *skb; 1190 struct ieee80211_mgmt *mgmt = (void *)frame_buf; 1191 1192 /* build frame */ 1193 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 1194 mgmt->duration = 0; /* initialize only */ 1195 mgmt->seq_ctrl = 0; /* initialize only */ 1196 memcpy(mgmt->da, bssid, ETH_ALEN); 1197 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 1198 memcpy(mgmt->bssid, bssid, ETH_ALEN); 1199 /* u.deauth.reason_code == u.disassoc.reason_code */ 1200 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 1201 1202 if (send_frame) { 1203 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 1204 IEEE80211_DEAUTH_FRAME_LEN); 1205 if (!skb) 1206 return; 1207 1208 skb_reserve(skb, local->hw.extra_tx_headroom); 1209 1210 /* copy in frame */ 1211 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN), 1212 mgmt, IEEE80211_DEAUTH_FRAME_LEN); 1213 1214 if (sdata->vif.type != NL80211_IFTYPE_STATION || 1215 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED)) 1216 IEEE80211_SKB_CB(skb)->flags |= 1217 IEEE80211_TX_INTFL_DONT_ENCRYPT; 1218 1219 ieee80211_tx_skb(sdata, skb); 1220 } 1221 } 1222 1223 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local, 1224 u8 *buffer, size_t buffer_len, 1225 const u8 *ie, size_t ie_len, 1226 enum ieee80211_band band, 1227 u32 rate_mask, 1228 struct cfg80211_chan_def *chandef, 1229 size_t *offset) 1230 { 1231 struct ieee80211_supported_band *sband; 1232 u8 *pos = buffer, *end = buffer + buffer_len; 1233 size_t noffset; 1234 int supp_rates_len, i; 1235 u8 rates[32]; 1236 int num_rates; 1237 int ext_rates_len; 1238 int shift; 1239 u32 rate_flags; 1240 1241 *offset = 0; 1242 1243 sband = local->hw.wiphy->bands[band]; 1244 if (WARN_ON_ONCE(!sband)) 1245 return 0; 1246 1247 rate_flags = ieee80211_chandef_rate_flags(chandef); 1248 shift = ieee80211_chandef_get_shift(chandef); 1249 1250 num_rates = 0; 1251 for (i = 0; i < sband->n_bitrates; i++) { 1252 if ((BIT(i) & rate_mask) == 0) 1253 continue; /* skip rate */ 1254 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1255 continue; 1256 1257 rates[num_rates++] = 1258 (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate, 1259 (1 << shift) * 5); 1260 } 1261 1262 supp_rates_len = min_t(int, num_rates, 8); 1263 1264 if (end - pos < 2 + supp_rates_len) 1265 goto out_err; 1266 *pos++ = WLAN_EID_SUPP_RATES; 1267 *pos++ = supp_rates_len; 1268 memcpy(pos, rates, supp_rates_len); 1269 pos += supp_rates_len; 1270 1271 /* insert "request information" if in custom IEs */ 1272 if (ie && ie_len) { 1273 static const u8 before_extrates[] = { 1274 WLAN_EID_SSID, 1275 WLAN_EID_SUPP_RATES, 1276 WLAN_EID_REQUEST, 1277 }; 1278 noffset = ieee80211_ie_split(ie, ie_len, 1279 before_extrates, 1280 ARRAY_SIZE(before_extrates), 1281 *offset); 1282 if (end - pos < noffset - *offset) 1283 goto out_err; 1284 memcpy(pos, ie + *offset, noffset - *offset); 1285 pos += noffset - *offset; 1286 *offset = noffset; 1287 } 1288 1289 ext_rates_len = num_rates - supp_rates_len; 1290 if (ext_rates_len > 0) { 1291 if (end - pos < 2 + ext_rates_len) 1292 goto out_err; 1293 *pos++ = WLAN_EID_EXT_SUPP_RATES; 1294 *pos++ = ext_rates_len; 1295 memcpy(pos, rates + supp_rates_len, ext_rates_len); 1296 pos += ext_rates_len; 1297 } 1298 1299 if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) { 1300 if (end - pos < 3) 1301 goto out_err; 1302 *pos++ = WLAN_EID_DS_PARAMS; 1303 *pos++ = 1; 1304 *pos++ = ieee80211_frequency_to_channel( 1305 chandef->chan->center_freq); 1306 } 1307 1308 /* insert custom IEs that go before HT */ 1309 if (ie && ie_len) { 1310 static const u8 before_ht[] = { 1311 WLAN_EID_SSID, 1312 WLAN_EID_SUPP_RATES, 1313 WLAN_EID_REQUEST, 1314 WLAN_EID_EXT_SUPP_RATES, 1315 WLAN_EID_DS_PARAMS, 1316 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 1317 }; 1318 noffset = ieee80211_ie_split(ie, ie_len, 1319 before_ht, ARRAY_SIZE(before_ht), 1320 *offset); 1321 if (end - pos < noffset - *offset) 1322 goto out_err; 1323 memcpy(pos, ie + *offset, noffset - *offset); 1324 pos += noffset - *offset; 1325 *offset = noffset; 1326 } 1327 1328 if (sband->ht_cap.ht_supported) { 1329 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap)) 1330 goto out_err; 1331 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, 1332 sband->ht_cap.cap); 1333 } 1334 1335 /* 1336 * If adding more here, adjust code in main.c 1337 * that calculates local->scan_ies_len. 1338 */ 1339 1340 /* insert custom IEs that go before VHT */ 1341 if (ie && ie_len) { 1342 static const u8 before_vht[] = { 1343 WLAN_EID_SSID, 1344 WLAN_EID_SUPP_RATES, 1345 WLAN_EID_REQUEST, 1346 WLAN_EID_EXT_SUPP_RATES, 1347 WLAN_EID_DS_PARAMS, 1348 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 1349 WLAN_EID_HT_CAPABILITY, 1350 WLAN_EID_BSS_COEX_2040, 1351 WLAN_EID_EXT_CAPABILITY, 1352 WLAN_EID_SSID_LIST, 1353 WLAN_EID_CHANNEL_USAGE, 1354 WLAN_EID_INTERWORKING, 1355 /* mesh ID can't happen here */ 1356 /* 60 GHz can't happen here right now */ 1357 }; 1358 noffset = ieee80211_ie_split(ie, ie_len, 1359 before_vht, ARRAY_SIZE(before_vht), 1360 *offset); 1361 if (end - pos < noffset - *offset) 1362 goto out_err; 1363 memcpy(pos, ie + *offset, noffset - *offset); 1364 pos += noffset - *offset; 1365 *offset = noffset; 1366 } 1367 1368 if (sband->vht_cap.vht_supported) { 1369 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap)) 1370 goto out_err; 1371 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 1372 sband->vht_cap.cap); 1373 } 1374 1375 return pos - buffer; 1376 out_err: 1377 WARN_ONCE(1, "not enough space for preq IEs\n"); 1378 return pos - buffer; 1379 } 1380 1381 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, 1382 size_t buffer_len, 1383 struct ieee80211_scan_ies *ie_desc, 1384 const u8 *ie, size_t ie_len, 1385 u8 bands_used, u32 *rate_masks, 1386 struct cfg80211_chan_def *chandef) 1387 { 1388 size_t pos = 0, old_pos = 0, custom_ie_offset = 0; 1389 int i; 1390 1391 memset(ie_desc, 0, sizeof(*ie_desc)); 1392 1393 for (i = 0; i < IEEE80211_NUM_BANDS; i++) { 1394 if (bands_used & BIT(i)) { 1395 pos += ieee80211_build_preq_ies_band(local, 1396 buffer + pos, 1397 buffer_len - pos, 1398 ie, ie_len, i, 1399 rate_masks[i], 1400 chandef, 1401 &custom_ie_offset); 1402 ie_desc->ies[i] = buffer + old_pos; 1403 ie_desc->len[i] = pos - old_pos; 1404 old_pos = pos; 1405 } 1406 } 1407 1408 /* add any remaining custom IEs */ 1409 if (ie && ie_len) { 1410 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset, 1411 "not enough space for preq custom IEs\n")) 1412 return pos; 1413 memcpy(buffer + pos, ie + custom_ie_offset, 1414 ie_len - custom_ie_offset); 1415 ie_desc->common_ies = buffer + pos; 1416 ie_desc->common_ie_len = ie_len - custom_ie_offset; 1417 pos += ie_len - custom_ie_offset; 1418 } 1419 1420 return pos; 1421 }; 1422 1423 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata, 1424 u8 *dst, u32 ratemask, 1425 struct ieee80211_channel *chan, 1426 const u8 *ssid, size_t ssid_len, 1427 const u8 *ie, size_t ie_len, 1428 bool directed) 1429 { 1430 struct ieee80211_local *local = sdata->local; 1431 struct cfg80211_chan_def chandef; 1432 struct sk_buff *skb; 1433 struct ieee80211_mgmt *mgmt; 1434 int ies_len; 1435 u32 rate_masks[IEEE80211_NUM_BANDS] = {}; 1436 struct ieee80211_scan_ies dummy_ie_desc; 1437 1438 /* 1439 * Do not send DS Channel parameter for directed probe requests 1440 * in order to maximize the chance that we get a response. Some 1441 * badly-behaved APs don't respond when this parameter is included. 1442 */ 1443 chandef.width = sdata->vif.bss_conf.chandef.width; 1444 if (directed) 1445 chandef.chan = NULL; 1446 else 1447 chandef.chan = chan; 1448 1449 skb = ieee80211_probereq_get(&local->hw, &sdata->vif, 1450 ssid, ssid_len, 100 + ie_len); 1451 if (!skb) 1452 return NULL; 1453 1454 rate_masks[chan->band] = ratemask; 1455 ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb), 1456 skb_tailroom(skb), &dummy_ie_desc, 1457 ie, ie_len, BIT(chan->band), 1458 rate_masks, &chandef); 1459 skb_put(skb, ies_len); 1460 1461 if (dst) { 1462 mgmt = (struct ieee80211_mgmt *) skb->data; 1463 memcpy(mgmt->da, dst, ETH_ALEN); 1464 memcpy(mgmt->bssid, dst, ETH_ALEN); 1465 } 1466 1467 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1468 1469 return skb; 1470 } 1471 1472 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, 1473 const u8 *ssid, size_t ssid_len, 1474 const u8 *ie, size_t ie_len, 1475 u32 ratemask, bool directed, u32 tx_flags, 1476 struct ieee80211_channel *channel, bool scan) 1477 { 1478 struct sk_buff *skb; 1479 1480 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel, 1481 ssid, ssid_len, 1482 ie, ie_len, directed); 1483 if (skb) { 1484 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 1485 if (scan) 1486 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 1487 else 1488 ieee80211_tx_skb(sdata, skb); 1489 } 1490 } 1491 1492 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata, 1493 struct ieee802_11_elems *elems, 1494 enum ieee80211_band band, u32 *basic_rates) 1495 { 1496 struct ieee80211_supported_band *sband; 1497 size_t num_rates; 1498 u32 supp_rates, rate_flags; 1499 int i, j, shift; 1500 sband = sdata->local->hw.wiphy->bands[band]; 1501 1502 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 1503 shift = ieee80211_vif_get_shift(&sdata->vif); 1504 1505 if (WARN_ON(!sband)) 1506 return 1; 1507 1508 num_rates = sband->n_bitrates; 1509 supp_rates = 0; 1510 for (i = 0; i < elems->supp_rates_len + 1511 elems->ext_supp_rates_len; i++) { 1512 u8 rate = 0; 1513 int own_rate; 1514 bool is_basic; 1515 if (i < elems->supp_rates_len) 1516 rate = elems->supp_rates[i]; 1517 else if (elems->ext_supp_rates) 1518 rate = elems->ext_supp_rates 1519 [i - elems->supp_rates_len]; 1520 own_rate = 5 * (rate & 0x7f); 1521 is_basic = !!(rate & 0x80); 1522 1523 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) 1524 continue; 1525 1526 for (j = 0; j < num_rates; j++) { 1527 int brate; 1528 if ((rate_flags & sband->bitrates[j].flags) 1529 != rate_flags) 1530 continue; 1531 1532 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 1533 1 << shift); 1534 1535 if (brate == own_rate) { 1536 supp_rates |= BIT(j); 1537 if (basic_rates && is_basic) 1538 *basic_rates |= BIT(j); 1539 } 1540 } 1541 } 1542 return supp_rates; 1543 } 1544 1545 void ieee80211_stop_device(struct ieee80211_local *local) 1546 { 1547 ieee80211_led_radio(local, false); 1548 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO); 1549 1550 cancel_work_sync(&local->reconfig_filter); 1551 1552 flush_workqueue(local->workqueue); 1553 drv_stop(local); 1554 } 1555 1556 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local) 1557 { 1558 struct ieee80211_sub_if_data *sdata; 1559 struct ieee80211_chanctx *ctx; 1560 1561 /* 1562 * We get here if during resume the device can't be restarted properly. 1563 * We might also get here if this happens during HW reset, which is a 1564 * slightly different situation and we need to drop all connections in 1565 * the latter case. 1566 * 1567 * Ask cfg80211 to turn off all interfaces, this will result in more 1568 * warnings but at least we'll then get into a clean stopped state. 1569 */ 1570 1571 local->resuming = false; 1572 local->suspended = false; 1573 local->started = false; 1574 1575 /* scheduled scan clearly can't be running any more, but tell 1576 * cfg80211 and clear local state 1577 */ 1578 ieee80211_sched_scan_end(local); 1579 1580 list_for_each_entry(sdata, &local->interfaces, list) 1581 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER; 1582 1583 /* Mark channel contexts as not being in the driver any more to avoid 1584 * removing them from the driver during the shutdown process... 1585 */ 1586 mutex_lock(&local->chanctx_mtx); 1587 list_for_each_entry(ctx, &local->chanctx_list, list) 1588 ctx->driver_present = false; 1589 mutex_unlock(&local->chanctx_mtx); 1590 1591 cfg80211_shutdown_all_interfaces(local->hw.wiphy); 1592 } 1593 1594 static void ieee80211_assign_chanctx(struct ieee80211_local *local, 1595 struct ieee80211_sub_if_data *sdata) 1596 { 1597 struct ieee80211_chanctx_conf *conf; 1598 struct ieee80211_chanctx *ctx; 1599 1600 if (!local->use_chanctx) 1601 return; 1602 1603 mutex_lock(&local->chanctx_mtx); 1604 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1605 lockdep_is_held(&local->chanctx_mtx)); 1606 if (conf) { 1607 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1608 drv_assign_vif_chanctx(local, sdata, ctx); 1609 } 1610 mutex_unlock(&local->chanctx_mtx); 1611 } 1612 1613 int ieee80211_reconfig(struct ieee80211_local *local) 1614 { 1615 struct ieee80211_hw *hw = &local->hw; 1616 struct ieee80211_sub_if_data *sdata; 1617 struct ieee80211_chanctx *ctx; 1618 struct sta_info *sta; 1619 int res, i; 1620 bool reconfig_due_to_wowlan = false; 1621 struct ieee80211_sub_if_data *sched_scan_sdata; 1622 bool sched_scan_stopped = false; 1623 1624 #ifdef CONFIG_PM 1625 if (local->suspended) 1626 local->resuming = true; 1627 1628 if (local->wowlan) { 1629 res = drv_resume(local); 1630 local->wowlan = false; 1631 if (res < 0) { 1632 local->resuming = false; 1633 return res; 1634 } 1635 if (res == 0) 1636 goto wake_up; 1637 WARN_ON(res > 1); 1638 /* 1639 * res is 1, which means the driver requested 1640 * to go through a regular reset on wakeup. 1641 */ 1642 reconfig_due_to_wowlan = true; 1643 } 1644 #endif 1645 /* everything else happens only if HW was up & running */ 1646 if (!local->open_count) 1647 goto wake_up; 1648 1649 /* 1650 * Upon resume hardware can sometimes be goofy due to 1651 * various platform / driver / bus issues, so restarting 1652 * the device may at times not work immediately. Propagate 1653 * the error. 1654 */ 1655 res = drv_start(local); 1656 if (res) { 1657 if (local->suspended) 1658 WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n"); 1659 else 1660 WARN(1, "Hardware became unavailable during restart.\n"); 1661 ieee80211_handle_reconfig_failure(local); 1662 return res; 1663 } 1664 1665 /* setup fragmentation threshold */ 1666 drv_set_frag_threshold(local, hw->wiphy->frag_threshold); 1667 1668 /* setup RTS threshold */ 1669 drv_set_rts_threshold(local, hw->wiphy->rts_threshold); 1670 1671 /* reset coverage class */ 1672 drv_set_coverage_class(local, hw->wiphy->coverage_class); 1673 1674 ieee80211_led_radio(local, true); 1675 ieee80211_mod_tpt_led_trig(local, 1676 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0); 1677 1678 /* add interfaces */ 1679 sdata = rtnl_dereference(local->monitor_sdata); 1680 if (sdata) { 1681 /* in HW restart it exists already */ 1682 WARN_ON(local->resuming); 1683 res = drv_add_interface(local, sdata); 1684 if (WARN_ON(res)) { 1685 RCU_INIT_POINTER(local->monitor_sdata, NULL); 1686 synchronize_net(); 1687 kfree(sdata); 1688 } 1689 } 1690 1691 list_for_each_entry(sdata, &local->interfaces, list) { 1692 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 1693 sdata->vif.type != NL80211_IFTYPE_MONITOR && 1694 ieee80211_sdata_running(sdata)) 1695 res = drv_add_interface(local, sdata); 1696 } 1697 1698 /* add channel contexts */ 1699 if (local->use_chanctx) { 1700 mutex_lock(&local->chanctx_mtx); 1701 list_for_each_entry(ctx, &local->chanctx_list, list) 1702 if (ctx->replace_state != 1703 IEEE80211_CHANCTX_REPLACES_OTHER) 1704 WARN_ON(drv_add_chanctx(local, ctx)); 1705 mutex_unlock(&local->chanctx_mtx); 1706 1707 list_for_each_entry(sdata, &local->interfaces, list) { 1708 if (!ieee80211_sdata_running(sdata)) 1709 continue; 1710 ieee80211_assign_chanctx(local, sdata); 1711 } 1712 1713 sdata = rtnl_dereference(local->monitor_sdata); 1714 if (sdata && ieee80211_sdata_running(sdata)) 1715 ieee80211_assign_chanctx(local, sdata); 1716 } 1717 1718 /* add STAs back */ 1719 mutex_lock(&local->sta_mtx); 1720 list_for_each_entry(sta, &local->sta_list, list) { 1721 enum ieee80211_sta_state state; 1722 1723 if (!sta->uploaded) 1724 continue; 1725 1726 /* AP-mode stations will be added later */ 1727 if (sta->sdata->vif.type == NL80211_IFTYPE_AP) 1728 continue; 1729 1730 for (state = IEEE80211_STA_NOTEXIST; 1731 state < sta->sta_state; state++) 1732 WARN_ON(drv_sta_state(local, sta->sdata, sta, state, 1733 state + 1)); 1734 } 1735 mutex_unlock(&local->sta_mtx); 1736 1737 /* reconfigure tx conf */ 1738 if (hw->queues >= IEEE80211_NUM_ACS) { 1739 list_for_each_entry(sdata, &local->interfaces, list) { 1740 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1741 sdata->vif.type == NL80211_IFTYPE_MONITOR || 1742 !ieee80211_sdata_running(sdata)) 1743 continue; 1744 1745 for (i = 0; i < IEEE80211_NUM_ACS; i++) 1746 drv_conf_tx(local, sdata, i, 1747 &sdata->tx_conf[i]); 1748 } 1749 } 1750 1751 /* reconfigure hardware */ 1752 ieee80211_hw_config(local, ~0); 1753 1754 ieee80211_configure_filter(local); 1755 1756 /* Finally also reconfigure all the BSS information */ 1757 list_for_each_entry(sdata, &local->interfaces, list) { 1758 u32 changed; 1759 1760 if (!ieee80211_sdata_running(sdata)) 1761 continue; 1762 1763 /* common change flags for all interface types */ 1764 changed = BSS_CHANGED_ERP_CTS_PROT | 1765 BSS_CHANGED_ERP_PREAMBLE | 1766 BSS_CHANGED_ERP_SLOT | 1767 BSS_CHANGED_HT | 1768 BSS_CHANGED_BASIC_RATES | 1769 BSS_CHANGED_BEACON_INT | 1770 BSS_CHANGED_BSSID | 1771 BSS_CHANGED_CQM | 1772 BSS_CHANGED_QOS | 1773 BSS_CHANGED_IDLE | 1774 BSS_CHANGED_TXPOWER; 1775 1776 switch (sdata->vif.type) { 1777 case NL80211_IFTYPE_STATION: 1778 changed |= BSS_CHANGED_ASSOC | 1779 BSS_CHANGED_ARP_FILTER | 1780 BSS_CHANGED_PS; 1781 1782 /* Re-send beacon info report to the driver */ 1783 if (sdata->u.mgd.have_beacon) 1784 changed |= BSS_CHANGED_BEACON_INFO; 1785 1786 sdata_lock(sdata); 1787 ieee80211_bss_info_change_notify(sdata, changed); 1788 sdata_unlock(sdata); 1789 break; 1790 case NL80211_IFTYPE_ADHOC: 1791 changed |= BSS_CHANGED_IBSS; 1792 /* fall through */ 1793 case NL80211_IFTYPE_AP: 1794 changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS; 1795 1796 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1797 changed |= BSS_CHANGED_AP_PROBE_RESP; 1798 1799 if (rcu_access_pointer(sdata->u.ap.beacon)) 1800 drv_start_ap(local, sdata); 1801 } 1802 1803 /* fall through */ 1804 case NL80211_IFTYPE_MESH_POINT: 1805 if (sdata->vif.bss_conf.enable_beacon) { 1806 changed |= BSS_CHANGED_BEACON | 1807 BSS_CHANGED_BEACON_ENABLED; 1808 ieee80211_bss_info_change_notify(sdata, changed); 1809 } 1810 break; 1811 case NL80211_IFTYPE_WDS: 1812 case NL80211_IFTYPE_AP_VLAN: 1813 case NL80211_IFTYPE_MONITOR: 1814 case NL80211_IFTYPE_P2P_DEVICE: 1815 /* nothing to do */ 1816 break; 1817 case NL80211_IFTYPE_UNSPECIFIED: 1818 case NUM_NL80211_IFTYPES: 1819 case NL80211_IFTYPE_P2P_CLIENT: 1820 case NL80211_IFTYPE_P2P_GO: 1821 WARN_ON(1); 1822 break; 1823 } 1824 } 1825 1826 ieee80211_recalc_ps(local, -1); 1827 1828 /* 1829 * The sta might be in psm against the ap (e.g. because 1830 * this was the state before a hw restart), so we 1831 * explicitly send a null packet in order to make sure 1832 * it'll sync against the ap (and get out of psm). 1833 */ 1834 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) { 1835 list_for_each_entry(sdata, &local->interfaces, list) { 1836 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1837 continue; 1838 if (!sdata->u.mgd.associated) 1839 continue; 1840 1841 ieee80211_send_nullfunc(local, sdata, 0); 1842 } 1843 } 1844 1845 /* APs are now beaconing, add back stations */ 1846 mutex_lock(&local->sta_mtx); 1847 list_for_each_entry(sta, &local->sta_list, list) { 1848 enum ieee80211_sta_state state; 1849 1850 if (!sta->uploaded) 1851 continue; 1852 1853 if (sta->sdata->vif.type != NL80211_IFTYPE_AP) 1854 continue; 1855 1856 for (state = IEEE80211_STA_NOTEXIST; 1857 state < sta->sta_state; state++) 1858 WARN_ON(drv_sta_state(local, sta->sdata, sta, state, 1859 state + 1)); 1860 } 1861 mutex_unlock(&local->sta_mtx); 1862 1863 /* add back keys */ 1864 list_for_each_entry(sdata, &local->interfaces, list) 1865 if (ieee80211_sdata_running(sdata)) 1866 ieee80211_enable_keys(sdata); 1867 1868 wake_up: 1869 local->in_reconfig = false; 1870 barrier(); 1871 1872 if (local->monitors == local->open_count && local->monitors > 0) 1873 ieee80211_add_virtual_monitor(local); 1874 1875 /* 1876 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation 1877 * sessions can be established after a resume. 1878 * 1879 * Also tear down aggregation sessions since reconfiguring 1880 * them in a hardware restart scenario is not easily done 1881 * right now, and the hardware will have lost information 1882 * about the sessions, but we and the AP still think they 1883 * are active. This is really a workaround though. 1884 */ 1885 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) { 1886 mutex_lock(&local->sta_mtx); 1887 1888 list_for_each_entry(sta, &local->sta_list, list) { 1889 ieee80211_sta_tear_down_BA_sessions( 1890 sta, AGG_STOP_LOCAL_REQUEST); 1891 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 1892 } 1893 1894 mutex_unlock(&local->sta_mtx); 1895 } 1896 1897 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP, 1898 IEEE80211_QUEUE_STOP_REASON_SUSPEND, 1899 false); 1900 1901 /* 1902 * Reconfigure sched scan if it was interrupted by FW restart or 1903 * suspend. 1904 */ 1905 mutex_lock(&local->mtx); 1906 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1907 lockdep_is_held(&local->mtx)); 1908 if (sched_scan_sdata && local->sched_scan_req) 1909 /* 1910 * Sched scan stopped, but we don't want to report it. Instead, 1911 * we're trying to reschedule. 1912 */ 1913 if (__ieee80211_request_sched_scan_start(sched_scan_sdata, 1914 local->sched_scan_req)) 1915 sched_scan_stopped = true; 1916 mutex_unlock(&local->mtx); 1917 1918 if (sched_scan_stopped) 1919 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy); 1920 1921 /* 1922 * If this is for hw restart things are still running. 1923 * We may want to change that later, however. 1924 */ 1925 if (!local->suspended || reconfig_due_to_wowlan) 1926 drv_restart_complete(local); 1927 1928 if (!local->suspended) 1929 return 0; 1930 1931 #ifdef CONFIG_PM 1932 /* first set suspended false, then resuming */ 1933 local->suspended = false; 1934 mb(); 1935 local->resuming = false; 1936 1937 list_for_each_entry(sdata, &local->interfaces, list) { 1938 if (!ieee80211_sdata_running(sdata)) 1939 continue; 1940 if (sdata->vif.type == NL80211_IFTYPE_STATION) 1941 ieee80211_sta_restart(sdata); 1942 } 1943 1944 mod_timer(&local->sta_cleanup, jiffies + 1); 1945 #else 1946 WARN_ON(1); 1947 #endif 1948 1949 return 0; 1950 } 1951 1952 void ieee80211_resume_disconnect(struct ieee80211_vif *vif) 1953 { 1954 struct ieee80211_sub_if_data *sdata; 1955 struct ieee80211_local *local; 1956 struct ieee80211_key *key; 1957 1958 if (WARN_ON(!vif)) 1959 return; 1960 1961 sdata = vif_to_sdata(vif); 1962 local = sdata->local; 1963 1964 if (WARN_ON(!local->resuming)) 1965 return; 1966 1967 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1968 return; 1969 1970 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME; 1971 1972 mutex_lock(&local->key_mtx); 1973 list_for_each_entry(key, &sdata->key_list, list) 1974 key->flags |= KEY_FLAG_TAINTED; 1975 mutex_unlock(&local->key_mtx); 1976 } 1977 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect); 1978 1979 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata) 1980 { 1981 struct ieee80211_local *local = sdata->local; 1982 struct ieee80211_chanctx_conf *chanctx_conf; 1983 struct ieee80211_chanctx *chanctx; 1984 1985 mutex_lock(&local->chanctx_mtx); 1986 1987 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1988 lockdep_is_held(&local->chanctx_mtx)); 1989 1990 if (WARN_ON_ONCE(!chanctx_conf)) 1991 goto unlock; 1992 1993 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf); 1994 ieee80211_recalc_smps_chanctx(local, chanctx); 1995 unlock: 1996 mutex_unlock(&local->chanctx_mtx); 1997 } 1998 1999 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata) 2000 { 2001 struct ieee80211_local *local = sdata->local; 2002 struct ieee80211_chanctx_conf *chanctx_conf; 2003 struct ieee80211_chanctx *chanctx; 2004 2005 mutex_lock(&local->chanctx_mtx); 2006 2007 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 2008 lockdep_is_held(&local->chanctx_mtx)); 2009 2010 if (WARN_ON_ONCE(!chanctx_conf)) 2011 goto unlock; 2012 2013 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf); 2014 ieee80211_recalc_chanctx_min_def(local, chanctx); 2015 unlock: 2016 mutex_unlock(&local->chanctx_mtx); 2017 } 2018 2019 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id) 2020 { 2021 int i; 2022 2023 for (i = 0; i < n_ids; i++) 2024 if (ids[i] == id) 2025 return true; 2026 return false; 2027 } 2028 2029 /** 2030 * ieee80211_ie_split - split an IE buffer according to ordering 2031 * 2032 * @ies: the IE buffer 2033 * @ielen: the length of the IE buffer 2034 * @ids: an array with element IDs that are allowed before 2035 * the split 2036 * @n_ids: the size of the element ID array 2037 * @offset: offset where to start splitting in the buffer 2038 * 2039 * This function splits an IE buffer by updating the @offset 2040 * variable to point to the location where the buffer should be 2041 * split. 2042 * 2043 * It assumes that the given IE buffer is well-formed, this 2044 * has to be guaranteed by the caller! 2045 * 2046 * It also assumes that the IEs in the buffer are ordered 2047 * correctly, if not the result of using this function will not 2048 * be ordered correctly either, i.e. it does no reordering. 2049 * 2050 * The function returns the offset where the next part of the 2051 * buffer starts, which may be @ielen if the entire (remainder) 2052 * of the buffer should be used. 2053 */ 2054 size_t ieee80211_ie_split(const u8 *ies, size_t ielen, 2055 const u8 *ids, int n_ids, size_t offset) 2056 { 2057 size_t pos = offset; 2058 2059 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) 2060 pos += 2 + ies[pos + 1]; 2061 2062 return pos; 2063 } 2064 2065 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset) 2066 { 2067 size_t pos = offset; 2068 2069 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC) 2070 pos += 2 + ies[pos + 1]; 2071 2072 return pos; 2073 } 2074 2075 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata, 2076 int rssi_min_thold, 2077 int rssi_max_thold) 2078 { 2079 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold); 2080 2081 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) 2082 return; 2083 2084 /* 2085 * Scale up threshold values before storing it, as the RSSI averaging 2086 * algorithm uses a scaled up value as well. Change this scaling 2087 * factor if the RSSI averaging algorithm changes. 2088 */ 2089 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16; 2090 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16; 2091 } 2092 2093 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif, 2094 int rssi_min_thold, 2095 int rssi_max_thold) 2096 { 2097 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2098 2099 WARN_ON(rssi_min_thold == rssi_max_thold || 2100 rssi_min_thold > rssi_max_thold); 2101 2102 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold, 2103 rssi_max_thold); 2104 } 2105 EXPORT_SYMBOL(ieee80211_enable_rssi_reports); 2106 2107 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif) 2108 { 2109 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2110 2111 _ieee80211_enable_rssi_reports(sdata, 0, 0); 2112 } 2113 EXPORT_SYMBOL(ieee80211_disable_rssi_reports); 2114 2115 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap, 2116 u16 cap) 2117 { 2118 __le16 tmp; 2119 2120 *pos++ = WLAN_EID_HT_CAPABILITY; 2121 *pos++ = sizeof(struct ieee80211_ht_cap); 2122 memset(pos, 0, sizeof(struct ieee80211_ht_cap)); 2123 2124 /* capability flags */ 2125 tmp = cpu_to_le16(cap); 2126 memcpy(pos, &tmp, sizeof(u16)); 2127 pos += sizeof(u16); 2128 2129 /* AMPDU parameters */ 2130 *pos++ = ht_cap->ampdu_factor | 2131 (ht_cap->ampdu_density << 2132 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT); 2133 2134 /* MCS set */ 2135 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs)); 2136 pos += sizeof(ht_cap->mcs); 2137 2138 /* extended capabilities */ 2139 pos += sizeof(__le16); 2140 2141 /* BF capabilities */ 2142 pos += sizeof(__le32); 2143 2144 /* antenna selection */ 2145 pos += sizeof(u8); 2146 2147 return pos; 2148 } 2149 2150 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap, 2151 u32 cap) 2152 { 2153 __le32 tmp; 2154 2155 *pos++ = WLAN_EID_VHT_CAPABILITY; 2156 *pos++ = sizeof(struct ieee80211_vht_cap); 2157 memset(pos, 0, sizeof(struct ieee80211_vht_cap)); 2158 2159 /* capability flags */ 2160 tmp = cpu_to_le32(cap); 2161 memcpy(pos, &tmp, sizeof(u32)); 2162 pos += sizeof(u32); 2163 2164 /* VHT MCS set */ 2165 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs)); 2166 pos += sizeof(vht_cap->vht_mcs); 2167 2168 return pos; 2169 } 2170 2171 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap, 2172 const struct cfg80211_chan_def *chandef, 2173 u16 prot_mode) 2174 { 2175 struct ieee80211_ht_operation *ht_oper; 2176 /* Build HT Information */ 2177 *pos++ = WLAN_EID_HT_OPERATION; 2178 *pos++ = sizeof(struct ieee80211_ht_operation); 2179 ht_oper = (struct ieee80211_ht_operation *)pos; 2180 ht_oper->primary_chan = ieee80211_frequency_to_channel( 2181 chandef->chan->center_freq); 2182 switch (chandef->width) { 2183 case NL80211_CHAN_WIDTH_160: 2184 case NL80211_CHAN_WIDTH_80P80: 2185 case NL80211_CHAN_WIDTH_80: 2186 case NL80211_CHAN_WIDTH_40: 2187 if (chandef->center_freq1 > chandef->chan->center_freq) 2188 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 2189 else 2190 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 2191 break; 2192 default: 2193 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE; 2194 break; 2195 } 2196 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 && 2197 chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 2198 chandef->width != NL80211_CHAN_WIDTH_20) 2199 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY; 2200 2201 ht_oper->operation_mode = cpu_to_le16(prot_mode); 2202 ht_oper->stbc_param = 0x0000; 2203 2204 /* It seems that Basic MCS set and Supported MCS set 2205 are identical for the first 10 bytes */ 2206 memset(&ht_oper->basic_set, 0, 16); 2207 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10); 2208 2209 return pos + sizeof(struct ieee80211_ht_operation); 2210 } 2211 2212 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan, 2213 const struct ieee80211_ht_operation *ht_oper, 2214 struct cfg80211_chan_def *chandef) 2215 { 2216 enum nl80211_channel_type channel_type; 2217 2218 if (!ht_oper) { 2219 cfg80211_chandef_create(chandef, control_chan, 2220 NL80211_CHAN_NO_HT); 2221 return; 2222 } 2223 2224 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 2225 case IEEE80211_HT_PARAM_CHA_SEC_NONE: 2226 channel_type = NL80211_CHAN_HT20; 2227 break; 2228 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 2229 channel_type = NL80211_CHAN_HT40PLUS; 2230 break; 2231 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 2232 channel_type = NL80211_CHAN_HT40MINUS; 2233 break; 2234 default: 2235 channel_type = NL80211_CHAN_NO_HT; 2236 } 2237 2238 cfg80211_chandef_create(chandef, control_chan, channel_type); 2239 } 2240 2241 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef, 2242 const struct ieee80211_supported_band *sband, 2243 const u8 *srates, int srates_len, u32 *rates) 2244 { 2245 u32 rate_flags = ieee80211_chandef_rate_flags(chandef); 2246 int shift = ieee80211_chandef_get_shift(chandef); 2247 struct ieee80211_rate *br; 2248 int brate, rate, i, j, count = 0; 2249 2250 *rates = 0; 2251 2252 for (i = 0; i < srates_len; i++) { 2253 rate = srates[i] & 0x7f; 2254 2255 for (j = 0; j < sband->n_bitrates; j++) { 2256 br = &sband->bitrates[j]; 2257 if ((rate_flags & br->flags) != rate_flags) 2258 continue; 2259 2260 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5); 2261 if (brate == rate) { 2262 *rates |= BIT(j); 2263 count++; 2264 break; 2265 } 2266 } 2267 } 2268 return count; 2269 } 2270 2271 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata, 2272 struct sk_buff *skb, bool need_basic, 2273 enum ieee80211_band band) 2274 { 2275 struct ieee80211_local *local = sdata->local; 2276 struct ieee80211_supported_band *sband; 2277 int rate, shift; 2278 u8 i, rates, *pos; 2279 u32 basic_rates = sdata->vif.bss_conf.basic_rates; 2280 u32 rate_flags; 2281 2282 shift = ieee80211_vif_get_shift(&sdata->vif); 2283 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 2284 sband = local->hw.wiphy->bands[band]; 2285 rates = 0; 2286 for (i = 0; i < sband->n_bitrates; i++) { 2287 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 2288 continue; 2289 rates++; 2290 } 2291 if (rates > 8) 2292 rates = 8; 2293 2294 if (skb_tailroom(skb) < rates + 2) 2295 return -ENOMEM; 2296 2297 pos = skb_put(skb, rates + 2); 2298 *pos++ = WLAN_EID_SUPP_RATES; 2299 *pos++ = rates; 2300 for (i = 0; i < rates; i++) { 2301 u8 basic = 0; 2302 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 2303 continue; 2304 2305 if (need_basic && basic_rates & BIT(i)) 2306 basic = 0x80; 2307 rate = sband->bitrates[i].bitrate; 2308 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 2309 5 * (1 << shift)); 2310 *pos++ = basic | (u8) rate; 2311 } 2312 2313 return 0; 2314 } 2315 2316 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata, 2317 struct sk_buff *skb, bool need_basic, 2318 enum ieee80211_band band) 2319 { 2320 struct ieee80211_local *local = sdata->local; 2321 struct ieee80211_supported_band *sband; 2322 int rate, shift; 2323 u8 i, exrates, *pos; 2324 u32 basic_rates = sdata->vif.bss_conf.basic_rates; 2325 u32 rate_flags; 2326 2327 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 2328 shift = ieee80211_vif_get_shift(&sdata->vif); 2329 2330 sband = local->hw.wiphy->bands[band]; 2331 exrates = 0; 2332 for (i = 0; i < sband->n_bitrates; i++) { 2333 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 2334 continue; 2335 exrates++; 2336 } 2337 2338 if (exrates > 8) 2339 exrates -= 8; 2340 else 2341 exrates = 0; 2342 2343 if (skb_tailroom(skb) < exrates + 2) 2344 return -ENOMEM; 2345 2346 if (exrates) { 2347 pos = skb_put(skb, exrates + 2); 2348 *pos++ = WLAN_EID_EXT_SUPP_RATES; 2349 *pos++ = exrates; 2350 for (i = 8; i < sband->n_bitrates; i++) { 2351 u8 basic = 0; 2352 if ((rate_flags & sband->bitrates[i].flags) 2353 != rate_flags) 2354 continue; 2355 if (need_basic && basic_rates & BIT(i)) 2356 basic = 0x80; 2357 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate, 2358 5 * (1 << shift)); 2359 *pos++ = basic | (u8) rate; 2360 } 2361 } 2362 return 0; 2363 } 2364 2365 int ieee80211_ave_rssi(struct ieee80211_vif *vif) 2366 { 2367 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2368 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 2369 2370 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) { 2371 /* non-managed type inferfaces */ 2372 return 0; 2373 } 2374 return ifmgd->ave_beacon_signal / 16; 2375 } 2376 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi); 2377 2378 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs) 2379 { 2380 if (!mcs) 2381 return 1; 2382 2383 /* TODO: consider rx_highest */ 2384 2385 if (mcs->rx_mask[3]) 2386 return 4; 2387 if (mcs->rx_mask[2]) 2388 return 3; 2389 if (mcs->rx_mask[1]) 2390 return 2; 2391 return 1; 2392 } 2393 2394 /** 2395 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame 2396 * @local: mac80211 hw info struct 2397 * @status: RX status 2398 * @mpdu_len: total MPDU length (including FCS) 2399 * @mpdu_offset: offset into MPDU to calculate timestamp at 2400 * 2401 * This function calculates the RX timestamp at the given MPDU offset, taking 2402 * into account what the RX timestamp was. An offset of 0 will just normalize 2403 * the timestamp to TSF at beginning of MPDU reception. 2404 */ 2405 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local, 2406 struct ieee80211_rx_status *status, 2407 unsigned int mpdu_len, 2408 unsigned int mpdu_offset) 2409 { 2410 u64 ts = status->mactime; 2411 struct rate_info ri; 2412 u16 rate; 2413 2414 if (WARN_ON(!ieee80211_have_rx_timestamp(status))) 2415 return 0; 2416 2417 memset(&ri, 0, sizeof(ri)); 2418 2419 /* Fill cfg80211 rate info */ 2420 if (status->flag & RX_FLAG_HT) { 2421 ri.mcs = status->rate_idx; 2422 ri.flags |= RATE_INFO_FLAGS_MCS; 2423 if (status->flag & RX_FLAG_40MHZ) 2424 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH; 2425 if (status->flag & RX_FLAG_SHORT_GI) 2426 ri.flags |= RATE_INFO_FLAGS_SHORT_GI; 2427 } else if (status->flag & RX_FLAG_VHT) { 2428 ri.flags |= RATE_INFO_FLAGS_VHT_MCS; 2429 ri.mcs = status->rate_idx; 2430 ri.nss = status->vht_nss; 2431 if (status->flag & RX_FLAG_40MHZ) 2432 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH; 2433 if (status->vht_flag & RX_VHT_FLAG_80MHZ) 2434 ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH; 2435 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ) 2436 ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH; 2437 if (status->vht_flag & RX_VHT_FLAG_160MHZ) 2438 ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH; 2439 if (status->flag & RX_FLAG_SHORT_GI) 2440 ri.flags |= RATE_INFO_FLAGS_SHORT_GI; 2441 } else { 2442 struct ieee80211_supported_band *sband; 2443 int shift = 0; 2444 int bitrate; 2445 2446 if (status->flag & RX_FLAG_10MHZ) 2447 shift = 1; 2448 if (status->flag & RX_FLAG_5MHZ) 2449 shift = 2; 2450 2451 sband = local->hw.wiphy->bands[status->band]; 2452 bitrate = sband->bitrates[status->rate_idx].bitrate; 2453 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift)); 2454 } 2455 2456 rate = cfg80211_calculate_bitrate(&ri); 2457 if (WARN_ONCE(!rate, 2458 "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n", 2459 status->flag, status->rate_idx, status->vht_nss)) 2460 return 0; 2461 2462 /* rewind from end of MPDU */ 2463 if (status->flag & RX_FLAG_MACTIME_END) 2464 ts -= mpdu_len * 8 * 10 / rate; 2465 2466 ts += mpdu_offset * 8 * 10 / rate; 2467 2468 return ts; 2469 } 2470 2471 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local) 2472 { 2473 struct ieee80211_sub_if_data *sdata; 2474 struct cfg80211_chan_def chandef; 2475 2476 mutex_lock(&local->mtx); 2477 mutex_lock(&local->iflist_mtx); 2478 list_for_each_entry(sdata, &local->interfaces, list) { 2479 /* it might be waiting for the local->mtx, but then 2480 * by the time it gets it, sdata->wdev.cac_started 2481 * will no longer be true 2482 */ 2483 cancel_delayed_work(&sdata->dfs_cac_timer_work); 2484 2485 if (sdata->wdev.cac_started) { 2486 chandef = sdata->vif.bss_conf.chandef; 2487 ieee80211_vif_release_channel(sdata); 2488 cfg80211_cac_event(sdata->dev, 2489 &chandef, 2490 NL80211_RADAR_CAC_ABORTED, 2491 GFP_KERNEL); 2492 } 2493 } 2494 mutex_unlock(&local->iflist_mtx); 2495 mutex_unlock(&local->mtx); 2496 } 2497 2498 void ieee80211_dfs_radar_detected_work(struct work_struct *work) 2499 { 2500 struct ieee80211_local *local = 2501 container_of(work, struct ieee80211_local, radar_detected_work); 2502 struct cfg80211_chan_def chandef = local->hw.conf.chandef; 2503 2504 ieee80211_dfs_cac_cancel(local); 2505 2506 if (local->use_chanctx) 2507 /* currently not handled */ 2508 WARN_ON(1); 2509 else 2510 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL); 2511 } 2512 2513 void ieee80211_radar_detected(struct ieee80211_hw *hw) 2514 { 2515 struct ieee80211_local *local = hw_to_local(hw); 2516 2517 trace_api_radar_detected(local); 2518 2519 ieee80211_queue_work(hw, &local->radar_detected_work); 2520 } 2521 EXPORT_SYMBOL(ieee80211_radar_detected); 2522 2523 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c) 2524 { 2525 u32 ret; 2526 int tmp; 2527 2528 switch (c->width) { 2529 case NL80211_CHAN_WIDTH_20: 2530 c->width = NL80211_CHAN_WIDTH_20_NOHT; 2531 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 2532 break; 2533 case NL80211_CHAN_WIDTH_40: 2534 c->width = NL80211_CHAN_WIDTH_20; 2535 c->center_freq1 = c->chan->center_freq; 2536 ret = IEEE80211_STA_DISABLE_40MHZ | 2537 IEEE80211_STA_DISABLE_VHT; 2538 break; 2539 case NL80211_CHAN_WIDTH_80: 2540 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 2541 /* n_P40 */ 2542 tmp /= 2; 2543 /* freq_P40 */ 2544 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp; 2545 c->width = NL80211_CHAN_WIDTH_40; 2546 ret = IEEE80211_STA_DISABLE_VHT; 2547 break; 2548 case NL80211_CHAN_WIDTH_80P80: 2549 c->center_freq2 = 0; 2550 c->width = NL80211_CHAN_WIDTH_80; 2551 ret = IEEE80211_STA_DISABLE_80P80MHZ | 2552 IEEE80211_STA_DISABLE_160MHZ; 2553 break; 2554 case NL80211_CHAN_WIDTH_160: 2555 /* n_P20 */ 2556 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 2557 /* n_P80 */ 2558 tmp /= 4; 2559 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp; 2560 c->width = NL80211_CHAN_WIDTH_80; 2561 ret = IEEE80211_STA_DISABLE_80P80MHZ | 2562 IEEE80211_STA_DISABLE_160MHZ; 2563 break; 2564 default: 2565 case NL80211_CHAN_WIDTH_20_NOHT: 2566 WARN_ON_ONCE(1); 2567 c->width = NL80211_CHAN_WIDTH_20_NOHT; 2568 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 2569 break; 2570 case NL80211_CHAN_WIDTH_5: 2571 case NL80211_CHAN_WIDTH_10: 2572 WARN_ON_ONCE(1); 2573 /* keep c->width */ 2574 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; 2575 break; 2576 } 2577 2578 WARN_ON_ONCE(!cfg80211_chandef_valid(c)); 2579 2580 return ret; 2581 } 2582 2583 /* 2584 * Returns true if smps_mode_new is strictly more restrictive than 2585 * smps_mode_old. 2586 */ 2587 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old, 2588 enum ieee80211_smps_mode smps_mode_new) 2589 { 2590 if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC || 2591 smps_mode_new == IEEE80211_SMPS_AUTOMATIC)) 2592 return false; 2593 2594 switch (smps_mode_old) { 2595 case IEEE80211_SMPS_STATIC: 2596 return false; 2597 case IEEE80211_SMPS_DYNAMIC: 2598 return smps_mode_new == IEEE80211_SMPS_STATIC; 2599 case IEEE80211_SMPS_OFF: 2600 return smps_mode_new != IEEE80211_SMPS_OFF; 2601 default: 2602 WARN_ON(1); 2603 } 2604 2605 return false; 2606 } 2607 2608 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata, 2609 struct cfg80211_csa_settings *csa_settings) 2610 { 2611 struct sk_buff *skb; 2612 struct ieee80211_mgmt *mgmt; 2613 struct ieee80211_local *local = sdata->local; 2614 int freq; 2615 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) + 2616 sizeof(mgmt->u.action.u.chan_switch); 2617 u8 *pos; 2618 2619 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 2620 sdata->vif.type != NL80211_IFTYPE_MESH_POINT) 2621 return -EOPNOTSUPP; 2622 2623 skb = dev_alloc_skb(local->tx_headroom + hdr_len + 2624 5 + /* channel switch announcement element */ 2625 3 + /* secondary channel offset element */ 2626 8); /* mesh channel switch parameters element */ 2627 if (!skb) 2628 return -ENOMEM; 2629 2630 skb_reserve(skb, local->tx_headroom); 2631 mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len); 2632 memset(mgmt, 0, hdr_len); 2633 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2634 IEEE80211_STYPE_ACTION); 2635 2636 eth_broadcast_addr(mgmt->da); 2637 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2638 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2639 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2640 } else { 2641 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2642 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 2643 } 2644 mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; 2645 mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH; 2646 pos = skb_put(skb, 5); 2647 *pos++ = WLAN_EID_CHANNEL_SWITCH; /* EID */ 2648 *pos++ = 3; /* IE length */ 2649 *pos++ = csa_settings->block_tx ? 1 : 0; /* CSA mode */ 2650 freq = csa_settings->chandef.chan->center_freq; 2651 *pos++ = ieee80211_frequency_to_channel(freq); /* channel */ 2652 *pos++ = csa_settings->count; /* count */ 2653 2654 if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) { 2655 enum nl80211_channel_type ch_type; 2656 2657 skb_put(skb, 3); 2658 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */ 2659 *pos++ = 1; /* IE length */ 2660 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef); 2661 if (ch_type == NL80211_CHAN_HT40PLUS) 2662 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE; 2663 else 2664 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW; 2665 } 2666 2667 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2668 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2669 2670 skb_put(skb, 8); 2671 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM; /* EID */ 2672 *pos++ = 6; /* IE length */ 2673 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL; /* Mesh TTL */ 2674 *pos = 0x00; /* Mesh Flag: Tx Restrict, Initiator, Reason */ 2675 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR; 2676 *pos++ |= csa_settings->block_tx ? 2677 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00; 2678 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */ 2679 pos += 2; 2680 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */ 2681 pos += 2; 2682 } 2683 2684 ieee80211_tx_skb(sdata, skb); 2685 return 0; 2686 } 2687 2688 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs) 2689 { 2690 return !(cs == NULL || cs->cipher == 0 || 2691 cs->hdr_len < cs->pn_len + cs->pn_off || 2692 cs->hdr_len <= cs->key_idx_off || 2693 cs->key_idx_shift > 7 || 2694 cs->key_idx_mask == 0); 2695 } 2696 2697 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n) 2698 { 2699 int i; 2700 2701 /* Ensure we have enough iftype bitmap space for all iftype values */ 2702 WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype)); 2703 2704 for (i = 0; i < n; i++) 2705 if (!ieee80211_cs_valid(&cs[i])) 2706 return false; 2707 2708 return true; 2709 } 2710 2711 const struct ieee80211_cipher_scheme * 2712 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher, 2713 enum nl80211_iftype iftype) 2714 { 2715 const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes; 2716 int n = local->hw.n_cipher_schemes; 2717 int i; 2718 const struct ieee80211_cipher_scheme *cs = NULL; 2719 2720 for (i = 0; i < n; i++) { 2721 if (l[i].cipher == cipher) { 2722 cs = &l[i]; 2723 break; 2724 } 2725 } 2726 2727 if (!cs || !(cs->iftype & BIT(iftype))) 2728 return NULL; 2729 2730 return cs; 2731 } 2732 2733 int ieee80211_cs_headroom(struct ieee80211_local *local, 2734 struct cfg80211_crypto_settings *crypto, 2735 enum nl80211_iftype iftype) 2736 { 2737 const struct ieee80211_cipher_scheme *cs; 2738 int headroom = IEEE80211_ENCRYPT_HEADROOM; 2739 int i; 2740 2741 for (i = 0; i < crypto->n_ciphers_pairwise; i++) { 2742 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i], 2743 iftype); 2744 2745 if (cs && headroom < cs->hdr_len) 2746 headroom = cs->hdr_len; 2747 } 2748 2749 cs = ieee80211_cs_get(local, crypto->cipher_group, iftype); 2750 if (cs && headroom < cs->hdr_len) 2751 headroom = cs->hdr_len; 2752 2753 return headroom; 2754 } 2755 2756 static bool 2757 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i) 2758 { 2759 s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1); 2760 int skip; 2761 2762 if (end > 0) 2763 return false; 2764 2765 /* End time is in the past, check for repetitions */ 2766 skip = DIV_ROUND_UP(-end, data->desc[i].interval); 2767 if (data->count[i] < 255) { 2768 if (data->count[i] <= skip) { 2769 data->count[i] = 0; 2770 return false; 2771 } 2772 2773 data->count[i] -= skip; 2774 } 2775 2776 data->desc[i].start += skip * data->desc[i].interval; 2777 2778 return true; 2779 } 2780 2781 static bool 2782 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf, 2783 s32 *offset) 2784 { 2785 bool ret = false; 2786 int i; 2787 2788 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) { 2789 s32 cur; 2790 2791 if (!data->count[i]) 2792 continue; 2793 2794 if (ieee80211_extend_noa_desc(data, tsf + *offset, i)) 2795 ret = true; 2796 2797 cur = data->desc[i].start - tsf; 2798 if (cur > *offset) 2799 continue; 2800 2801 cur = data->desc[i].start + data->desc[i].duration - tsf; 2802 if (cur > *offset) 2803 *offset = cur; 2804 } 2805 2806 return ret; 2807 } 2808 2809 static u32 2810 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf) 2811 { 2812 s32 offset = 0; 2813 int tries = 0; 2814 /* 2815 * arbitrary limit, used to avoid infinite loops when combined NoA 2816 * descriptors cover the full time period. 2817 */ 2818 int max_tries = 5; 2819 2820 ieee80211_extend_absent_time(data, tsf, &offset); 2821 do { 2822 if (!ieee80211_extend_absent_time(data, tsf, &offset)) 2823 break; 2824 2825 tries++; 2826 } while (tries < max_tries); 2827 2828 return offset; 2829 } 2830 2831 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf) 2832 { 2833 u32 next_offset = BIT(31) - 1; 2834 int i; 2835 2836 data->absent = 0; 2837 data->has_next_tsf = false; 2838 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) { 2839 s32 start; 2840 2841 if (!data->count[i]) 2842 continue; 2843 2844 ieee80211_extend_noa_desc(data, tsf, i); 2845 start = data->desc[i].start - tsf; 2846 if (start <= 0) 2847 data->absent |= BIT(i); 2848 2849 if (next_offset > start) 2850 next_offset = start; 2851 2852 data->has_next_tsf = true; 2853 } 2854 2855 if (data->absent) 2856 next_offset = ieee80211_get_noa_absent_time(data, tsf); 2857 2858 data->next_tsf = tsf + next_offset; 2859 } 2860 EXPORT_SYMBOL(ieee80211_update_p2p_noa); 2861 2862 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr, 2863 struct ieee80211_noa_data *data, u32 tsf) 2864 { 2865 int ret = 0; 2866 int i; 2867 2868 memset(data, 0, sizeof(*data)); 2869 2870 for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) { 2871 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i]; 2872 2873 if (!desc->count || !desc->duration) 2874 continue; 2875 2876 data->count[i] = desc->count; 2877 data->desc[i].start = le32_to_cpu(desc->start_time); 2878 data->desc[i].duration = le32_to_cpu(desc->duration); 2879 data->desc[i].interval = le32_to_cpu(desc->interval); 2880 2881 if (data->count[i] > 1 && 2882 data->desc[i].interval < data->desc[i].duration) 2883 continue; 2884 2885 ieee80211_extend_noa_desc(data, tsf, i); 2886 ret++; 2887 } 2888 2889 if (ret) 2890 ieee80211_update_p2p_noa(data, tsf); 2891 2892 return ret; 2893 } 2894 EXPORT_SYMBOL(ieee80211_parse_p2p_noa); 2895 2896 void ieee80211_recalc_dtim(struct ieee80211_local *local, 2897 struct ieee80211_sub_if_data *sdata) 2898 { 2899 u64 tsf = drv_get_tsf(local, sdata); 2900 u64 dtim_count = 0; 2901 u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024; 2902 u8 dtim_period = sdata->vif.bss_conf.dtim_period; 2903 struct ps_data *ps; 2904 u8 bcns_from_dtim; 2905 2906 if (tsf == -1ULL || !beacon_int || !dtim_period) 2907 return; 2908 2909 if (sdata->vif.type == NL80211_IFTYPE_AP || 2910 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 2911 if (!sdata->bss) 2912 return; 2913 2914 ps = &sdata->bss->ps; 2915 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2916 ps = &sdata->u.mesh.ps; 2917 } else { 2918 return; 2919 } 2920 2921 /* 2922 * actually finds last dtim_count, mac80211 will update in 2923 * __beacon_add_tim(). 2924 * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period 2925 */ 2926 do_div(tsf, beacon_int); 2927 bcns_from_dtim = do_div(tsf, dtim_period); 2928 /* just had a DTIM */ 2929 if (!bcns_from_dtim) 2930 dtim_count = 0; 2931 else 2932 dtim_count = dtim_period - bcns_from_dtim; 2933 2934 ps->dtim_count = dtim_count; 2935 } 2936 2937 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local, 2938 struct ieee80211_chanctx *ctx) 2939 { 2940 struct ieee80211_sub_if_data *sdata; 2941 u8 radar_detect = 0; 2942 2943 lockdep_assert_held(&local->chanctx_mtx); 2944 2945 if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)) 2946 return 0; 2947 2948 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list) 2949 if (sdata->reserved_radar_required) 2950 radar_detect |= BIT(sdata->reserved_chandef.width); 2951 2952 /* 2953 * An in-place reservation context should not have any assigned vifs 2954 * until it replaces the other context. 2955 */ 2956 WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER && 2957 !list_empty(&ctx->assigned_vifs)); 2958 2959 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list) 2960 if (sdata->radar_required) 2961 radar_detect |= BIT(sdata->vif.bss_conf.chandef.width); 2962 2963 return radar_detect; 2964 } 2965 2966 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata, 2967 const struct cfg80211_chan_def *chandef, 2968 enum ieee80211_chanctx_mode chanmode, 2969 u8 radar_detect) 2970 { 2971 struct ieee80211_local *local = sdata->local; 2972 struct ieee80211_sub_if_data *sdata_iter; 2973 enum nl80211_iftype iftype = sdata->wdev.iftype; 2974 int num[NUM_NL80211_IFTYPES]; 2975 struct ieee80211_chanctx *ctx; 2976 int num_different_channels = 0; 2977 int total = 1; 2978 2979 lockdep_assert_held(&local->chanctx_mtx); 2980 2981 if (WARN_ON(hweight32(radar_detect) > 1)) 2982 return -EINVAL; 2983 2984 if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED && 2985 !chandef->chan)) 2986 return -EINVAL; 2987 2988 if (chandef) 2989 num_different_channels = 1; 2990 2991 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES)) 2992 return -EINVAL; 2993 2994 /* Always allow software iftypes */ 2995 if (local->hw.wiphy->software_iftypes & BIT(iftype)) { 2996 if (radar_detect) 2997 return -EINVAL; 2998 return 0; 2999 } 3000 3001 memset(num, 0, sizeof(num)); 3002 3003 if (iftype != NL80211_IFTYPE_UNSPECIFIED) 3004 num[iftype] = 1; 3005 3006 list_for_each_entry(ctx, &local->chanctx_list, list) { 3007 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 3008 continue; 3009 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx); 3010 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) { 3011 num_different_channels++; 3012 continue; 3013 } 3014 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED && 3015 cfg80211_chandef_compatible(chandef, 3016 &ctx->conf.def)) 3017 continue; 3018 num_different_channels++; 3019 } 3020 3021 list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) { 3022 struct wireless_dev *wdev_iter; 3023 3024 wdev_iter = &sdata_iter->wdev; 3025 3026 if (sdata_iter == sdata || 3027 rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL || 3028 local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype)) 3029 continue; 3030 3031 num[wdev_iter->iftype]++; 3032 total++; 3033 } 3034 3035 if (total == 1 && !radar_detect) 3036 return 0; 3037 3038 return cfg80211_check_combinations(local->hw.wiphy, 3039 num_different_channels, 3040 radar_detect, num); 3041 } 3042 3043 static void 3044 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c, 3045 void *data) 3046 { 3047 u32 *max_num_different_channels = data; 3048 3049 *max_num_different_channels = max(*max_num_different_channels, 3050 c->num_different_channels); 3051 } 3052 3053 int ieee80211_max_num_channels(struct ieee80211_local *local) 3054 { 3055 struct ieee80211_sub_if_data *sdata; 3056 int num[NUM_NL80211_IFTYPES] = {}; 3057 struct ieee80211_chanctx *ctx; 3058 int num_different_channels = 0; 3059 u8 radar_detect = 0; 3060 u32 max_num_different_channels = 1; 3061 int err; 3062 3063 lockdep_assert_held(&local->chanctx_mtx); 3064 3065 list_for_each_entry(ctx, &local->chanctx_list, list) { 3066 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 3067 continue; 3068 3069 num_different_channels++; 3070 3071 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx); 3072 } 3073 3074 list_for_each_entry_rcu(sdata, &local->interfaces, list) 3075 num[sdata->wdev.iftype]++; 3076 3077 err = cfg80211_iter_combinations(local->hw.wiphy, 3078 num_different_channels, radar_detect, 3079 num, ieee80211_iter_max_chans, 3080 &max_num_different_channels); 3081 if (err < 0) 3082 return err; 3083 3084 return max_num_different_channels; 3085 } 3086 3087 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo) 3088 { 3089 *buf++ = WLAN_EID_VENDOR_SPECIFIC; 3090 *buf++ = 7; /* len */ 3091 *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */ 3092 *buf++ = 0x50; 3093 *buf++ = 0xf2; 3094 *buf++ = 2; /* WME */ 3095 *buf++ = 0; /* WME info */ 3096 *buf++ = 1; /* WME ver */ 3097 *buf++ = qosinfo; /* U-APSD no in use */ 3098 3099 return buf; 3100 } 3101