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/types.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/if_arp.h> 21 #include <linux/wireless.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 void *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 = tx->skb; 101 struct ieee80211_hdr *hdr; 102 103 do { 104 hdr = (struct ieee80211_hdr *) skb->data; 105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 106 } while ((skb = skb->next)); 107 } 108 109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len, 110 int rate, int erp, int short_preamble) 111 { 112 int dur; 113 114 /* calculate duration (in microseconds, rounded up to next higher 115 * integer if it includes a fractional microsecond) to send frame of 116 * len bytes (does not include FCS) at the given rate. Duration will 117 * also include SIFS. 118 * 119 * rate is in 100 kbps, so divident is multiplied by 10 in the 120 * DIV_ROUND_UP() operations. 121 */ 122 123 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) { 124 /* 125 * OFDM: 126 * 127 * N_DBPS = DATARATE x 4 128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS) 129 * (16 = SIGNAL time, 6 = tail bits) 130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext 131 * 132 * T_SYM = 4 usec 133 * 802.11a - 17.5.2: aSIFSTime = 16 usec 134 * 802.11g - 19.8.4: aSIFSTime = 10 usec + 135 * signal ext = 6 usec 136 */ 137 dur = 16; /* SIFS + signal ext */ 138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */ 139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */ 140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10, 141 4 * rate); /* T_SYM x N_SYM */ 142 } else { 143 /* 144 * 802.11b or 802.11g with 802.11b compatibility: 145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime + 146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0. 147 * 148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4 149 * aSIFSTime = 10 usec 150 * aPreambleLength = 144 usec or 72 usec with short preamble 151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble 152 */ 153 dur = 10; /* aSIFSTime = 10 usec */ 154 dur += short_preamble ? (72 + 24) : (144 + 48); 155 156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate); 157 } 158 159 return dur; 160 } 161 162 /* Exported duration function for driver use */ 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, 164 struct ieee80211_vif *vif, 165 size_t frame_len, 166 struct ieee80211_rate *rate) 167 { 168 struct ieee80211_local *local = hw_to_local(hw); 169 struct ieee80211_sub_if_data *sdata; 170 u16 dur; 171 int erp; 172 bool short_preamble = false; 173 174 erp = 0; 175 if (vif) { 176 sdata = vif_to_sdata(vif); 177 short_preamble = sdata->vif.bss_conf.use_short_preamble; 178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 179 erp = rate->flags & IEEE80211_RATE_ERP_G; 180 } 181 182 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, 183 short_preamble); 184 185 return cpu_to_le16(dur); 186 } 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration); 188 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, 190 struct ieee80211_vif *vif, size_t frame_len, 191 const struct ieee80211_tx_info *frame_txctl) 192 { 193 struct ieee80211_local *local = hw_to_local(hw); 194 struct ieee80211_rate *rate; 195 struct ieee80211_sub_if_data *sdata; 196 bool short_preamble; 197 int erp; 198 u16 dur; 199 struct ieee80211_supported_band *sband; 200 201 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 202 203 short_preamble = false; 204 205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 206 207 erp = 0; 208 if (vif) { 209 sdata = vif_to_sdata(vif); 210 short_preamble = sdata->vif.bss_conf.use_short_preamble; 211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 212 erp = rate->flags & IEEE80211_RATE_ERP_G; 213 } 214 215 /* CTS duration */ 216 dur = ieee80211_frame_duration(local, 10, rate->bitrate, 217 erp, short_preamble); 218 /* Data frame duration */ 219 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate, 220 erp, short_preamble); 221 /* ACK duration */ 222 dur += ieee80211_frame_duration(local, 10, rate->bitrate, 223 erp, short_preamble); 224 225 return cpu_to_le16(dur); 226 } 227 EXPORT_SYMBOL(ieee80211_rts_duration); 228 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, 230 struct ieee80211_vif *vif, 231 size_t frame_len, 232 const struct ieee80211_tx_info *frame_txctl) 233 { 234 struct ieee80211_local *local = hw_to_local(hw); 235 struct ieee80211_rate *rate; 236 struct ieee80211_sub_if_data *sdata; 237 bool short_preamble; 238 int erp; 239 u16 dur; 240 struct ieee80211_supported_band *sband; 241 242 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 243 244 short_preamble = false; 245 246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 247 erp = 0; 248 if (vif) { 249 sdata = vif_to_sdata(vif); 250 short_preamble = sdata->vif.bss_conf.use_short_preamble; 251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 252 erp = rate->flags & IEEE80211_RATE_ERP_G; 253 } 254 255 /* Data frame duration */ 256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, 257 erp, short_preamble); 258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) { 259 /* ACK duration */ 260 dur += ieee80211_frame_duration(local, 10, rate->bitrate, 261 erp, short_preamble); 262 } 263 264 return cpu_to_le16(dur); 265 } 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration); 267 268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, 269 enum queue_stop_reason reason) 270 { 271 struct ieee80211_local *local = hw_to_local(hw); 272 struct ieee80211_sub_if_data *sdata; 273 274 if (WARN_ON(queue >= hw->queues)) 275 return; 276 277 __clear_bit(reason, &local->queue_stop_reasons[queue]); 278 279 if (local->queue_stop_reasons[queue] != 0) 280 /* someone still has this queue stopped */ 281 return; 282 283 if (!skb_queue_empty(&local->pending[queue])) 284 tasklet_schedule(&local->tx_pending_tasklet); 285 286 rcu_read_lock(); 287 list_for_each_entry_rcu(sdata, &local->interfaces, list) 288 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue)); 289 rcu_read_unlock(); 290 } 291 292 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue, 293 enum queue_stop_reason reason) 294 { 295 struct ieee80211_local *local = hw_to_local(hw); 296 unsigned long flags; 297 298 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 299 __ieee80211_wake_queue(hw, queue, reason); 300 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 301 } 302 303 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue) 304 { 305 ieee80211_wake_queue_by_reason(hw, queue, 306 IEEE80211_QUEUE_STOP_REASON_DRIVER); 307 } 308 EXPORT_SYMBOL(ieee80211_wake_queue); 309 310 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue, 311 enum queue_stop_reason reason) 312 { 313 struct ieee80211_local *local = hw_to_local(hw); 314 struct ieee80211_sub_if_data *sdata; 315 316 if (WARN_ON(queue >= hw->queues)) 317 return; 318 319 __set_bit(reason, &local->queue_stop_reasons[queue]); 320 321 rcu_read_lock(); 322 list_for_each_entry_rcu(sdata, &local->interfaces, list) 323 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue)); 324 rcu_read_unlock(); 325 } 326 327 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue, 328 enum queue_stop_reason reason) 329 { 330 struct ieee80211_local *local = hw_to_local(hw); 331 unsigned long flags; 332 333 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 334 __ieee80211_stop_queue(hw, queue, reason); 335 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 336 } 337 338 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue) 339 { 340 ieee80211_stop_queue_by_reason(hw, queue, 341 IEEE80211_QUEUE_STOP_REASON_DRIVER); 342 } 343 EXPORT_SYMBOL(ieee80211_stop_queue); 344 345 void ieee80211_add_pending_skb(struct ieee80211_local *local, 346 struct sk_buff *skb) 347 { 348 struct ieee80211_hw *hw = &local->hw; 349 unsigned long flags; 350 int queue = skb_get_queue_mapping(skb); 351 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 352 353 if (WARN_ON(!info->control.vif)) { 354 kfree_skb(skb); 355 return; 356 } 357 358 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 359 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 360 __skb_queue_tail(&local->pending[queue], skb); 361 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 362 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 363 } 364 365 int ieee80211_add_pending_skbs(struct ieee80211_local *local, 366 struct sk_buff_head *skbs) 367 { 368 struct ieee80211_hw *hw = &local->hw; 369 struct sk_buff *skb; 370 unsigned long flags; 371 int queue, ret = 0, i; 372 373 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 374 for (i = 0; i < hw->queues; i++) 375 __ieee80211_stop_queue(hw, i, 376 IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 377 378 while ((skb = skb_dequeue(skbs))) { 379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 380 381 if (WARN_ON(!info->control.vif)) { 382 kfree_skb(skb); 383 continue; 384 } 385 386 ret++; 387 queue = skb_get_queue_mapping(skb); 388 __skb_queue_tail(&local->pending[queue], skb); 389 } 390 391 for (i = 0; i < hw->queues; i++) 392 __ieee80211_wake_queue(hw, i, 393 IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 394 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 395 396 return ret; 397 } 398 399 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw, 400 enum queue_stop_reason reason) 401 { 402 struct ieee80211_local *local = hw_to_local(hw); 403 unsigned long flags; 404 int i; 405 406 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 407 408 for (i = 0; i < hw->queues; i++) 409 __ieee80211_stop_queue(hw, i, reason); 410 411 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 412 } 413 414 void ieee80211_stop_queues(struct ieee80211_hw *hw) 415 { 416 ieee80211_stop_queues_by_reason(hw, 417 IEEE80211_QUEUE_STOP_REASON_DRIVER); 418 } 419 EXPORT_SYMBOL(ieee80211_stop_queues); 420 421 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue) 422 { 423 struct ieee80211_local *local = hw_to_local(hw); 424 unsigned long flags; 425 int ret; 426 427 if (WARN_ON(queue >= hw->queues)) 428 return true; 429 430 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 431 ret = !!local->queue_stop_reasons[queue]; 432 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 433 return ret; 434 } 435 EXPORT_SYMBOL(ieee80211_queue_stopped); 436 437 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw, 438 enum queue_stop_reason reason) 439 { 440 struct ieee80211_local *local = hw_to_local(hw); 441 unsigned long flags; 442 int i; 443 444 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 445 446 for (i = 0; i < hw->queues; i++) 447 __ieee80211_wake_queue(hw, i, reason); 448 449 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 450 } 451 452 void ieee80211_wake_queues(struct ieee80211_hw *hw) 453 { 454 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER); 455 } 456 EXPORT_SYMBOL(ieee80211_wake_queues); 457 458 void ieee80211_iterate_active_interfaces( 459 struct ieee80211_hw *hw, 460 void (*iterator)(void *data, u8 *mac, 461 struct ieee80211_vif *vif), 462 void *data) 463 { 464 struct ieee80211_local *local = hw_to_local(hw); 465 struct ieee80211_sub_if_data *sdata; 466 467 mutex_lock(&local->iflist_mtx); 468 469 list_for_each_entry(sdata, &local->interfaces, list) { 470 switch (sdata->vif.type) { 471 case __NL80211_IFTYPE_AFTER_LAST: 472 case NL80211_IFTYPE_UNSPECIFIED: 473 case NL80211_IFTYPE_MONITOR: 474 case NL80211_IFTYPE_AP_VLAN: 475 continue; 476 case NL80211_IFTYPE_AP: 477 case NL80211_IFTYPE_STATION: 478 case NL80211_IFTYPE_ADHOC: 479 case NL80211_IFTYPE_WDS: 480 case NL80211_IFTYPE_MESH_POINT: 481 break; 482 } 483 if (netif_running(sdata->dev)) 484 iterator(data, sdata->dev->dev_addr, 485 &sdata->vif); 486 } 487 488 mutex_unlock(&local->iflist_mtx); 489 } 490 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces); 491 492 void ieee80211_iterate_active_interfaces_atomic( 493 struct ieee80211_hw *hw, 494 void (*iterator)(void *data, u8 *mac, 495 struct ieee80211_vif *vif), 496 void *data) 497 { 498 struct ieee80211_local *local = hw_to_local(hw); 499 struct ieee80211_sub_if_data *sdata; 500 501 rcu_read_lock(); 502 503 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 504 switch (sdata->vif.type) { 505 case __NL80211_IFTYPE_AFTER_LAST: 506 case NL80211_IFTYPE_UNSPECIFIED: 507 case NL80211_IFTYPE_MONITOR: 508 case NL80211_IFTYPE_AP_VLAN: 509 continue; 510 case NL80211_IFTYPE_AP: 511 case NL80211_IFTYPE_STATION: 512 case NL80211_IFTYPE_ADHOC: 513 case NL80211_IFTYPE_WDS: 514 case NL80211_IFTYPE_MESH_POINT: 515 break; 516 } 517 if (netif_running(sdata->dev)) 518 iterator(data, sdata->dev->dev_addr, 519 &sdata->vif); 520 } 521 522 rcu_read_unlock(); 523 } 524 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic); 525 526 /* 527 * Nothing should have been stuffed into the workqueue during 528 * the suspend->resume cycle. If this WARN is seen then there 529 * is a bug with either the driver suspend or something in 530 * mac80211 stuffing into the workqueue which we haven't yet 531 * cleared during mac80211's suspend cycle. 532 */ 533 static bool ieee80211_can_queue_work(struct ieee80211_local *local) 534 { 535 if (WARN(local->suspended && !local->resuming, 536 "queueing ieee80211 work while going to suspend\n")) 537 return false; 538 539 return true; 540 } 541 542 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work) 543 { 544 struct ieee80211_local *local = hw_to_local(hw); 545 546 if (!ieee80211_can_queue_work(local)) 547 return; 548 549 queue_work(local->workqueue, work); 550 } 551 EXPORT_SYMBOL(ieee80211_queue_work); 552 553 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw, 554 struct delayed_work *dwork, 555 unsigned long delay) 556 { 557 struct ieee80211_local *local = hw_to_local(hw); 558 559 if (!ieee80211_can_queue_work(local)) 560 return; 561 562 queue_delayed_work(local->workqueue, dwork, delay); 563 } 564 EXPORT_SYMBOL(ieee80211_queue_delayed_work); 565 566 void ieee802_11_parse_elems(u8 *start, size_t len, 567 struct ieee802_11_elems *elems) 568 { 569 ieee802_11_parse_elems_crc(start, len, elems, 0, 0); 570 } 571 572 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, 573 struct ieee802_11_elems *elems, 574 u64 filter, u32 crc) 575 { 576 size_t left = len; 577 u8 *pos = start; 578 bool calc_crc = filter != 0; 579 580 memset(elems, 0, sizeof(*elems)); 581 elems->ie_start = start; 582 elems->total_len = len; 583 584 while (left >= 2) { 585 u8 id, elen; 586 587 id = *pos++; 588 elen = *pos++; 589 left -= 2; 590 591 if (elen > left) 592 break; 593 594 if (calc_crc && id < 64 && (filter & (1ULL << id))) 595 crc = crc32_be(crc, pos - 2, elen + 2); 596 597 switch (id) { 598 case WLAN_EID_SSID: 599 elems->ssid = pos; 600 elems->ssid_len = elen; 601 break; 602 case WLAN_EID_SUPP_RATES: 603 elems->supp_rates = pos; 604 elems->supp_rates_len = elen; 605 break; 606 case WLAN_EID_FH_PARAMS: 607 elems->fh_params = pos; 608 elems->fh_params_len = elen; 609 break; 610 case WLAN_EID_DS_PARAMS: 611 elems->ds_params = pos; 612 elems->ds_params_len = elen; 613 break; 614 case WLAN_EID_CF_PARAMS: 615 elems->cf_params = pos; 616 elems->cf_params_len = elen; 617 break; 618 case WLAN_EID_TIM: 619 if (elen >= sizeof(struct ieee80211_tim_ie)) { 620 elems->tim = (void *)pos; 621 elems->tim_len = elen; 622 } 623 break; 624 case WLAN_EID_IBSS_PARAMS: 625 elems->ibss_params = pos; 626 elems->ibss_params_len = elen; 627 break; 628 case WLAN_EID_CHALLENGE: 629 elems->challenge = pos; 630 elems->challenge_len = elen; 631 break; 632 case WLAN_EID_VENDOR_SPECIFIC: 633 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && 634 pos[2] == 0xf2) { 635 /* Microsoft OUI (00:50:F2) */ 636 637 if (calc_crc) 638 crc = crc32_be(crc, pos - 2, elen + 2); 639 640 if (pos[3] == 1) { 641 /* OUI Type 1 - WPA IE */ 642 elems->wpa = pos; 643 elems->wpa_len = elen; 644 } else if (elen >= 5 && pos[3] == 2) { 645 /* OUI Type 2 - WMM IE */ 646 if (pos[4] == 0) { 647 elems->wmm_info = pos; 648 elems->wmm_info_len = elen; 649 } else if (pos[4] == 1) { 650 elems->wmm_param = pos; 651 elems->wmm_param_len = elen; 652 } 653 } 654 } 655 break; 656 case WLAN_EID_RSN: 657 elems->rsn = pos; 658 elems->rsn_len = elen; 659 break; 660 case WLAN_EID_ERP_INFO: 661 elems->erp_info = pos; 662 elems->erp_info_len = elen; 663 break; 664 case WLAN_EID_EXT_SUPP_RATES: 665 elems->ext_supp_rates = pos; 666 elems->ext_supp_rates_len = elen; 667 break; 668 case WLAN_EID_HT_CAPABILITY: 669 if (elen >= sizeof(struct ieee80211_ht_cap)) 670 elems->ht_cap_elem = (void *)pos; 671 break; 672 case WLAN_EID_HT_INFORMATION: 673 if (elen >= sizeof(struct ieee80211_ht_info)) 674 elems->ht_info_elem = (void *)pos; 675 break; 676 case WLAN_EID_MESH_ID: 677 elems->mesh_id = pos; 678 elems->mesh_id_len = elen; 679 break; 680 case WLAN_EID_MESH_CONFIG: 681 if (elen >= sizeof(struct ieee80211_meshconf_ie)) 682 elems->mesh_config = (void *)pos; 683 break; 684 case WLAN_EID_PEER_LINK: 685 elems->peer_link = pos; 686 elems->peer_link_len = elen; 687 break; 688 case WLAN_EID_PREQ: 689 elems->preq = pos; 690 elems->preq_len = elen; 691 break; 692 case WLAN_EID_PREP: 693 elems->prep = pos; 694 elems->prep_len = elen; 695 break; 696 case WLAN_EID_PERR: 697 elems->perr = pos; 698 elems->perr_len = elen; 699 break; 700 case WLAN_EID_RANN: 701 if (elen >= sizeof(struct ieee80211_rann_ie)) 702 elems->rann = (void *)pos; 703 break; 704 case WLAN_EID_CHANNEL_SWITCH: 705 elems->ch_switch_elem = pos; 706 elems->ch_switch_elem_len = elen; 707 break; 708 case WLAN_EID_QUIET: 709 if (!elems->quiet_elem) { 710 elems->quiet_elem = pos; 711 elems->quiet_elem_len = elen; 712 } 713 elems->num_of_quiet_elem++; 714 break; 715 case WLAN_EID_COUNTRY: 716 elems->country_elem = pos; 717 elems->country_elem_len = elen; 718 break; 719 case WLAN_EID_PWR_CONSTRAINT: 720 elems->pwr_constr_elem = pos; 721 elems->pwr_constr_elem_len = elen; 722 break; 723 case WLAN_EID_TIMEOUT_INTERVAL: 724 elems->timeout_int = pos; 725 elems->timeout_int_len = elen; 726 break; 727 default: 728 break; 729 } 730 731 left -= elen; 732 pos += elen; 733 } 734 735 return crc; 736 } 737 738 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata) 739 { 740 struct ieee80211_local *local = sdata->local; 741 struct ieee80211_tx_queue_params qparam; 742 int queue; 743 bool use_11b; 744 int aCWmin, aCWmax; 745 746 if (!local->ops->conf_tx) 747 return; 748 749 memset(&qparam, 0, sizeof(qparam)); 750 751 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) && 752 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE); 753 754 for (queue = 0; queue < local_to_hw(local)->queues; queue++) { 755 /* Set defaults according to 802.11-2007 Table 7-37 */ 756 aCWmax = 1023; 757 if (use_11b) 758 aCWmin = 31; 759 else 760 aCWmin = 15; 761 762 switch (queue) { 763 case 3: /* AC_BK */ 764 qparam.cw_max = aCWmax; 765 qparam.cw_min = aCWmin; 766 qparam.txop = 0; 767 qparam.aifs = 7; 768 break; 769 default: /* never happens but let's not leave undefined */ 770 case 2: /* AC_BE */ 771 qparam.cw_max = aCWmax; 772 qparam.cw_min = aCWmin; 773 qparam.txop = 0; 774 qparam.aifs = 3; 775 break; 776 case 1: /* AC_VI */ 777 qparam.cw_max = aCWmin; 778 qparam.cw_min = (aCWmin + 1) / 2 - 1; 779 if (use_11b) 780 qparam.txop = 6016/32; 781 else 782 qparam.txop = 3008/32; 783 qparam.aifs = 2; 784 break; 785 case 0: /* AC_VO */ 786 qparam.cw_max = (aCWmin + 1) / 2 - 1; 787 qparam.cw_min = (aCWmin + 1) / 4 - 1; 788 if (use_11b) 789 qparam.txop = 3264/32; 790 else 791 qparam.txop = 1504/32; 792 qparam.aifs = 2; 793 break; 794 } 795 796 drv_conf_tx(local, queue, &qparam); 797 } 798 } 799 800 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata, 801 const size_t supp_rates_len, 802 const u8 *supp_rates) 803 { 804 struct ieee80211_local *local = sdata->local; 805 int i, have_higher_than_11mbit = 0; 806 807 /* cf. IEEE 802.11 9.2.12 */ 808 for (i = 0; i < supp_rates_len; i++) 809 if ((supp_rates[i] & 0x7f) * 5 > 110) 810 have_higher_than_11mbit = 1; 811 812 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 813 have_higher_than_11mbit) 814 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 815 else 816 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 817 818 ieee80211_set_wmm_default(sdata); 819 } 820 821 u32 ieee80211_mandatory_rates(struct ieee80211_local *local, 822 enum ieee80211_band band) 823 { 824 struct ieee80211_supported_band *sband; 825 struct ieee80211_rate *bitrates; 826 u32 mandatory_rates; 827 enum ieee80211_rate_flags mandatory_flag; 828 int i; 829 830 sband = local->hw.wiphy->bands[band]; 831 if (!sband) { 832 WARN_ON(1); 833 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 834 } 835 836 if (band == IEEE80211_BAND_2GHZ) 837 mandatory_flag = IEEE80211_RATE_MANDATORY_B; 838 else 839 mandatory_flag = IEEE80211_RATE_MANDATORY_A; 840 841 bitrates = sband->bitrates; 842 mandatory_rates = 0; 843 for (i = 0; i < sband->n_bitrates; i++) 844 if (bitrates[i].flags & mandatory_flag) 845 mandatory_rates |= BIT(i); 846 return mandatory_rates; 847 } 848 849 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, 850 u16 transaction, u16 auth_alg, 851 u8 *extra, size_t extra_len, const u8 *bssid, 852 const u8 *key, u8 key_len, u8 key_idx) 853 { 854 struct ieee80211_local *local = sdata->local; 855 struct sk_buff *skb; 856 struct ieee80211_mgmt *mgmt; 857 int err; 858 859 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 860 sizeof(*mgmt) + 6 + extra_len); 861 if (!skb) { 862 printk(KERN_DEBUG "%s: failed to allocate buffer for auth " 863 "frame\n", sdata->dev->name); 864 return; 865 } 866 skb_reserve(skb, local->hw.extra_tx_headroom); 867 868 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); 869 memset(mgmt, 0, 24 + 6); 870 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 871 IEEE80211_STYPE_AUTH); 872 memcpy(mgmt->da, bssid, ETH_ALEN); 873 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 874 memcpy(mgmt->bssid, bssid, ETH_ALEN); 875 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg); 876 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); 877 mgmt->u.auth.status_code = cpu_to_le16(0); 878 if (extra) 879 memcpy(skb_put(skb, extra_len), extra, extra_len); 880 881 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) { 882 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 883 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx); 884 WARN_ON(err); 885 } 886 887 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 888 ieee80211_tx_skb(sdata, skb); 889 } 890 891 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, 892 const u8 *ie, size_t ie_len, 893 enum ieee80211_band band) 894 { 895 struct ieee80211_supported_band *sband; 896 u8 *pos, *supp_rates_len, *esupp_rates_len = NULL; 897 int i; 898 899 sband = local->hw.wiphy->bands[band]; 900 901 pos = buffer; 902 903 *pos++ = WLAN_EID_SUPP_RATES; 904 supp_rates_len = pos; 905 *pos++ = 0; 906 907 for (i = 0; i < sband->n_bitrates; i++) { 908 struct ieee80211_rate *rate = &sband->bitrates[i]; 909 910 if (esupp_rates_len) { 911 *esupp_rates_len += 1; 912 } else if (*supp_rates_len == 8) { 913 *pos++ = WLAN_EID_EXT_SUPP_RATES; 914 esupp_rates_len = pos; 915 *pos++ = 1; 916 } else 917 *supp_rates_len += 1; 918 919 *pos++ = rate->bitrate / 5; 920 } 921 922 if (sband->ht_cap.ht_supported) { 923 __le16 tmp = cpu_to_le16(sband->ht_cap.cap); 924 925 *pos++ = WLAN_EID_HT_CAPABILITY; 926 *pos++ = sizeof(struct ieee80211_ht_cap); 927 memset(pos, 0, sizeof(struct ieee80211_ht_cap)); 928 memcpy(pos, &tmp, sizeof(u16)); 929 pos += sizeof(u16); 930 /* TODO: needs a define here for << 2 */ 931 *pos++ = sband->ht_cap.ampdu_factor | 932 (sband->ht_cap.ampdu_density << 2); 933 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); 934 pos += sizeof(sband->ht_cap.mcs); 935 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */ 936 } 937 938 /* 939 * If adding more here, adjust code in main.c 940 * that calculates local->scan_ies_len. 941 */ 942 943 if (ie) { 944 memcpy(pos, ie, ie_len); 945 pos += ie_len; 946 } 947 948 return pos - buffer; 949 } 950 951 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, 952 const u8 *ssid, size_t ssid_len, 953 const u8 *ie, size_t ie_len) 954 { 955 struct ieee80211_local *local = sdata->local; 956 struct sk_buff *skb; 957 struct ieee80211_mgmt *mgmt; 958 u8 *pos; 959 960 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 + 961 ie_len); 962 if (!skb) { 963 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 964 "request\n", sdata->dev->name); 965 return; 966 } 967 skb_reserve(skb, local->hw.extra_tx_headroom); 968 969 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 970 memset(mgmt, 0, 24); 971 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 972 IEEE80211_STYPE_PROBE_REQ); 973 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 974 if (dst) { 975 memcpy(mgmt->da, dst, ETH_ALEN); 976 memcpy(mgmt->bssid, dst, ETH_ALEN); 977 } else { 978 memset(mgmt->da, 0xff, ETH_ALEN); 979 memset(mgmt->bssid, 0xff, ETH_ALEN); 980 } 981 pos = skb_put(skb, 2 + ssid_len); 982 *pos++ = WLAN_EID_SSID; 983 *pos++ = ssid_len; 984 memcpy(pos, ssid, ssid_len); 985 pos += ssid_len; 986 987 skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len, 988 local->hw.conf.channel->band)); 989 990 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 991 ieee80211_tx_skb(sdata, skb); 992 } 993 994 u32 ieee80211_sta_get_rates(struct ieee80211_local *local, 995 struct ieee802_11_elems *elems, 996 enum ieee80211_band band) 997 { 998 struct ieee80211_supported_band *sband; 999 struct ieee80211_rate *bitrates; 1000 size_t num_rates; 1001 u32 supp_rates; 1002 int i, j; 1003 sband = local->hw.wiphy->bands[band]; 1004 1005 if (!sband) { 1006 WARN_ON(1); 1007 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1008 } 1009 1010 bitrates = sband->bitrates; 1011 num_rates = sband->n_bitrates; 1012 supp_rates = 0; 1013 for (i = 0; i < elems->supp_rates_len + 1014 elems->ext_supp_rates_len; i++) { 1015 u8 rate = 0; 1016 int own_rate; 1017 if (i < elems->supp_rates_len) 1018 rate = elems->supp_rates[i]; 1019 else if (elems->ext_supp_rates) 1020 rate = elems->ext_supp_rates 1021 [i - elems->supp_rates_len]; 1022 own_rate = 5 * (rate & 0x7f); 1023 for (j = 0; j < num_rates; j++) 1024 if (bitrates[j].bitrate == own_rate) 1025 supp_rates |= BIT(j); 1026 } 1027 return supp_rates; 1028 } 1029 1030 void ieee80211_stop_device(struct ieee80211_local *local) 1031 { 1032 ieee80211_led_radio(local, false); 1033 1034 cancel_work_sync(&local->reconfig_filter); 1035 drv_stop(local); 1036 1037 flush_workqueue(local->workqueue); 1038 } 1039 1040 int ieee80211_reconfig(struct ieee80211_local *local) 1041 { 1042 struct ieee80211_hw *hw = &local->hw; 1043 struct ieee80211_sub_if_data *sdata; 1044 struct ieee80211_if_init_conf conf; 1045 struct sta_info *sta; 1046 unsigned long flags; 1047 int res; 1048 1049 if (local->suspended) 1050 local->resuming = true; 1051 1052 /* restart hardware */ 1053 if (local->open_count) { 1054 /* 1055 * Upon resume hardware can sometimes be goofy due to 1056 * various platform / driver / bus issues, so restarting 1057 * the device may at times not work immediately. Propagate 1058 * the error. 1059 */ 1060 res = drv_start(local); 1061 if (res) { 1062 WARN(local->suspended, "Harware became unavailable " 1063 "upon resume. This is could be a software issue" 1064 "prior to suspend or a harware issue\n"); 1065 return res; 1066 } 1067 1068 ieee80211_led_radio(local, true); 1069 } 1070 1071 /* add interfaces */ 1072 list_for_each_entry(sdata, &local->interfaces, list) { 1073 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 1074 sdata->vif.type != NL80211_IFTYPE_MONITOR && 1075 netif_running(sdata->dev)) { 1076 conf.vif = &sdata->vif; 1077 conf.type = sdata->vif.type; 1078 conf.mac_addr = sdata->dev->dev_addr; 1079 res = drv_add_interface(local, &conf); 1080 } 1081 } 1082 1083 /* add STAs back */ 1084 if (local->ops->sta_notify) { 1085 spin_lock_irqsave(&local->sta_lock, flags); 1086 list_for_each_entry(sta, &local->sta_list, list) { 1087 sdata = sta->sdata; 1088 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1089 sdata = container_of(sdata->bss, 1090 struct ieee80211_sub_if_data, 1091 u.ap); 1092 1093 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, 1094 &sta->sta); 1095 } 1096 spin_unlock_irqrestore(&local->sta_lock, flags); 1097 } 1098 1099 /* Clear Suspend state so that ADDBA requests can be processed */ 1100 1101 rcu_read_lock(); 1102 1103 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) { 1104 list_for_each_entry_rcu(sta, &local->sta_list, list) { 1105 clear_sta_flags(sta, WLAN_STA_SUSPEND); 1106 } 1107 } 1108 1109 rcu_read_unlock(); 1110 1111 /* setup RTS threshold */ 1112 drv_set_rts_threshold(local, hw->wiphy->rts_threshold); 1113 1114 /* reconfigure hardware */ 1115 ieee80211_hw_config(local, ~0); 1116 1117 ieee80211_configure_filter(local); 1118 1119 /* Finally also reconfigure all the BSS information */ 1120 list_for_each_entry(sdata, &local->interfaces, list) { 1121 u32 changed = ~0; 1122 if (!netif_running(sdata->dev)) 1123 continue; 1124 switch (sdata->vif.type) { 1125 case NL80211_IFTYPE_STATION: 1126 /* disable beacon change bits */ 1127 changed &= ~(BSS_CHANGED_BEACON | 1128 BSS_CHANGED_BEACON_ENABLED); 1129 /* fall through */ 1130 case NL80211_IFTYPE_ADHOC: 1131 case NL80211_IFTYPE_AP: 1132 case NL80211_IFTYPE_MESH_POINT: 1133 ieee80211_bss_info_change_notify(sdata, changed); 1134 break; 1135 case NL80211_IFTYPE_WDS: 1136 break; 1137 case NL80211_IFTYPE_AP_VLAN: 1138 case NL80211_IFTYPE_MONITOR: 1139 /* ignore virtual */ 1140 break; 1141 case NL80211_IFTYPE_UNSPECIFIED: 1142 case __NL80211_IFTYPE_AFTER_LAST: 1143 WARN_ON(1); 1144 break; 1145 } 1146 } 1147 1148 /* add back keys */ 1149 list_for_each_entry(sdata, &local->interfaces, list) 1150 if (netif_running(sdata->dev)) 1151 ieee80211_enable_keys(sdata); 1152 1153 ieee80211_wake_queues_by_reason(hw, 1154 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 1155 1156 /* 1157 * If this is for hw restart things are still running. 1158 * We may want to change that later, however. 1159 */ 1160 if (!local->suspended) 1161 return 0; 1162 1163 #ifdef CONFIG_PM 1164 /* first set suspended false, then resuming */ 1165 local->suspended = false; 1166 mb(); 1167 local->resuming = false; 1168 1169 list_for_each_entry(sdata, &local->interfaces, list) { 1170 switch(sdata->vif.type) { 1171 case NL80211_IFTYPE_STATION: 1172 ieee80211_sta_restart(sdata); 1173 break; 1174 case NL80211_IFTYPE_ADHOC: 1175 ieee80211_ibss_restart(sdata); 1176 break; 1177 case NL80211_IFTYPE_MESH_POINT: 1178 ieee80211_mesh_restart(sdata); 1179 break; 1180 default: 1181 break; 1182 } 1183 } 1184 1185 add_timer(&local->sta_cleanup); 1186 1187 spin_lock_irqsave(&local->sta_lock, flags); 1188 list_for_each_entry(sta, &local->sta_list, list) 1189 mesh_plink_restart(sta); 1190 spin_unlock_irqrestore(&local->sta_lock, flags); 1191 #else 1192 WARN_ON(1); 1193 #endif 1194 return 0; 1195 } 1196 1197