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/bitmap.h> 22 #include <linux/crc32.h> 23 #include <net/net_namespace.h> 24 #include <net/cfg80211.h> 25 #include <net/rtnetlink.h> 26 27 #include "ieee80211_i.h" 28 #include "driver-ops.h" 29 #include "rate.h" 30 #include "mesh.h" 31 #include "wme.h" 32 #include "led.h" 33 #include "wep.h" 34 35 /* privid for wiphys to determine whether they belong to us or not */ 36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid; 37 38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy) 39 { 40 struct ieee80211_local *local; 41 BUG_ON(!wiphy); 42 43 local = wiphy_priv(wiphy); 44 return &local->hw; 45 } 46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw); 47 48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, 49 enum nl80211_iftype type) 50 { 51 __le16 fc = hdr->frame_control; 52 53 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ 54 if (len < 16) 55 return NULL; 56 57 if (ieee80211_is_data(fc)) { 58 if (len < 24) /* drop incorrect hdr len (data) */ 59 return NULL; 60 61 if (ieee80211_has_a4(fc)) 62 return NULL; 63 if (ieee80211_has_tods(fc)) 64 return hdr->addr1; 65 if (ieee80211_has_fromds(fc)) 66 return hdr->addr2; 67 68 return hdr->addr3; 69 } 70 71 if (ieee80211_is_mgmt(fc)) { 72 if (len < 24) /* drop incorrect hdr len (mgmt) */ 73 return NULL; 74 return hdr->addr3; 75 } 76 77 if (ieee80211_is_ctl(fc)) { 78 if(ieee80211_is_pspoll(fc)) 79 return hdr->addr1; 80 81 if (ieee80211_is_back_req(fc)) { 82 switch (type) { 83 case NL80211_IFTYPE_STATION: 84 return hdr->addr2; 85 case NL80211_IFTYPE_AP: 86 case NL80211_IFTYPE_AP_VLAN: 87 return hdr->addr1; 88 default: 89 break; /* fall through to the return */ 90 } 91 } 92 } 93 94 return NULL; 95 } 96 97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx) 98 { 99 struct sk_buff *skb = tx->skb; 100 struct ieee80211_hdr *hdr; 101 102 do { 103 hdr = (struct ieee80211_hdr *) skb->data; 104 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 105 } while ((skb = skb->next)); 106 } 107 108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len, 109 int rate, int erp, int short_preamble) 110 { 111 int dur; 112 113 /* calculate duration (in microseconds, rounded up to next higher 114 * integer if it includes a fractional microsecond) to send frame of 115 * len bytes (does not include FCS) at the given rate. Duration will 116 * also include SIFS. 117 * 118 * rate is in 100 kbps, so divident is multiplied by 10 in the 119 * DIV_ROUND_UP() operations. 120 */ 121 122 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) { 123 /* 124 * OFDM: 125 * 126 * N_DBPS = DATARATE x 4 127 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS) 128 * (16 = SIGNAL time, 6 = tail bits) 129 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext 130 * 131 * T_SYM = 4 usec 132 * 802.11a - 17.5.2: aSIFSTime = 16 usec 133 * 802.11g - 19.8.4: aSIFSTime = 10 usec + 134 * signal ext = 6 usec 135 */ 136 dur = 16; /* SIFS + signal ext */ 137 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */ 138 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */ 139 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10, 140 4 * rate); /* T_SYM x N_SYM */ 141 } else { 142 /* 143 * 802.11b or 802.11g with 802.11b compatibility: 144 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime + 145 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0. 146 * 147 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4 148 * aSIFSTime = 10 usec 149 * aPreambleLength = 144 usec or 72 usec with short preamble 150 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble 151 */ 152 dur = 10; /* aSIFSTime = 10 usec */ 153 dur += short_preamble ? (72 + 24) : (144 + 48); 154 155 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate); 156 } 157 158 return dur; 159 } 160 161 /* Exported duration function for driver use */ 162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, 163 struct ieee80211_vif *vif, 164 size_t frame_len, 165 struct ieee80211_rate *rate) 166 { 167 struct ieee80211_local *local = hw_to_local(hw); 168 struct ieee80211_sub_if_data *sdata; 169 u16 dur; 170 int erp; 171 bool short_preamble = false; 172 173 erp = 0; 174 if (vif) { 175 sdata = vif_to_sdata(vif); 176 short_preamble = sdata->vif.bss_conf.use_short_preamble; 177 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 178 erp = rate->flags & IEEE80211_RATE_ERP_G; 179 } 180 181 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, 182 short_preamble); 183 184 return cpu_to_le16(dur); 185 } 186 EXPORT_SYMBOL(ieee80211_generic_frame_duration); 187 188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, 189 struct ieee80211_vif *vif, size_t frame_len, 190 const struct ieee80211_tx_info *frame_txctl) 191 { 192 struct ieee80211_local *local = hw_to_local(hw); 193 struct ieee80211_rate *rate; 194 struct ieee80211_sub_if_data *sdata; 195 bool short_preamble; 196 int erp; 197 u16 dur; 198 struct ieee80211_supported_band *sband; 199 200 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 201 202 short_preamble = false; 203 204 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 205 206 erp = 0; 207 if (vif) { 208 sdata = vif_to_sdata(vif); 209 short_preamble = sdata->vif.bss_conf.use_short_preamble; 210 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 211 erp = rate->flags & IEEE80211_RATE_ERP_G; 212 } 213 214 /* CTS duration */ 215 dur = ieee80211_frame_duration(local, 10, rate->bitrate, 216 erp, short_preamble); 217 /* Data frame duration */ 218 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate, 219 erp, short_preamble); 220 /* ACK duration */ 221 dur += ieee80211_frame_duration(local, 10, rate->bitrate, 222 erp, short_preamble); 223 224 return cpu_to_le16(dur); 225 } 226 EXPORT_SYMBOL(ieee80211_rts_duration); 227 228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, 229 struct ieee80211_vif *vif, 230 size_t frame_len, 231 const struct ieee80211_tx_info *frame_txctl) 232 { 233 struct ieee80211_local *local = hw_to_local(hw); 234 struct ieee80211_rate *rate; 235 struct ieee80211_sub_if_data *sdata; 236 bool short_preamble; 237 int erp; 238 u16 dur; 239 struct ieee80211_supported_band *sband; 240 241 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 242 243 short_preamble = false; 244 245 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; 246 erp = 0; 247 if (vif) { 248 sdata = vif_to_sdata(vif); 249 short_preamble = sdata->vif.bss_conf.use_short_preamble; 250 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 251 erp = rate->flags & IEEE80211_RATE_ERP_G; 252 } 253 254 /* Data frame duration */ 255 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, 256 erp, short_preamble); 257 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) { 258 /* ACK duration */ 259 dur += ieee80211_frame_duration(local, 10, rate->bitrate, 260 erp, short_preamble); 261 } 262 263 return cpu_to_le16(dur); 264 } 265 EXPORT_SYMBOL(ieee80211_ctstoself_duration); 266 267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, 268 enum queue_stop_reason reason) 269 { 270 struct ieee80211_local *local = hw_to_local(hw); 271 struct ieee80211_sub_if_data *sdata; 272 273 trace_wake_queue(local, queue, reason); 274 275 if (WARN_ON(queue >= hw->queues)) 276 return; 277 278 __clear_bit(reason, &local->queue_stop_reasons[queue]); 279 280 if (local->queue_stop_reasons[queue] != 0) 281 /* someone still has this queue stopped */ 282 return; 283 284 if (skb_queue_empty(&local->pending[queue])) { 285 rcu_read_lock(); 286 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 287 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 288 continue; 289 netif_wake_subqueue(sdata->dev, queue); 290 } 291 rcu_read_unlock(); 292 } else 293 tasklet_schedule(&local->tx_pending_tasklet); 294 } 295 296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue, 297 enum queue_stop_reason reason) 298 { 299 struct ieee80211_local *local = hw_to_local(hw); 300 unsigned long flags; 301 302 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 303 __ieee80211_wake_queue(hw, queue, reason); 304 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 305 } 306 307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue) 308 { 309 ieee80211_wake_queue_by_reason(hw, queue, 310 IEEE80211_QUEUE_STOP_REASON_DRIVER); 311 } 312 EXPORT_SYMBOL(ieee80211_wake_queue); 313 314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue, 315 enum queue_stop_reason reason) 316 { 317 struct ieee80211_local *local = hw_to_local(hw); 318 struct ieee80211_sub_if_data *sdata; 319 320 trace_stop_queue(local, queue, reason); 321 322 if (WARN_ON(queue >= hw->queues)) 323 return; 324 325 __set_bit(reason, &local->queue_stop_reasons[queue]); 326 327 rcu_read_lock(); 328 list_for_each_entry_rcu(sdata, &local->interfaces, list) 329 netif_stop_subqueue(sdata->dev, queue); 330 rcu_read_unlock(); 331 } 332 333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue, 334 enum queue_stop_reason reason) 335 { 336 struct ieee80211_local *local = hw_to_local(hw); 337 unsigned long flags; 338 339 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 340 __ieee80211_stop_queue(hw, queue, reason); 341 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 342 } 343 344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue) 345 { 346 ieee80211_stop_queue_by_reason(hw, queue, 347 IEEE80211_QUEUE_STOP_REASON_DRIVER); 348 } 349 EXPORT_SYMBOL(ieee80211_stop_queue); 350 351 void ieee80211_add_pending_skb(struct ieee80211_local *local, 352 struct sk_buff *skb) 353 { 354 struct ieee80211_hw *hw = &local->hw; 355 unsigned long flags; 356 int queue = skb_get_queue_mapping(skb); 357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 358 359 if (WARN_ON(!info->control.vif)) { 360 kfree_skb(skb); 361 return; 362 } 363 364 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 365 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 366 __skb_queue_tail(&local->pending[queue], skb); 367 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 368 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 369 } 370 371 int ieee80211_add_pending_skbs(struct ieee80211_local *local, 372 struct sk_buff_head *skbs) 373 { 374 struct ieee80211_hw *hw = &local->hw; 375 struct sk_buff *skb; 376 unsigned long flags; 377 int queue, ret = 0, i; 378 379 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 380 for (i = 0; i < hw->queues; i++) 381 __ieee80211_stop_queue(hw, i, 382 IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 383 384 while ((skb = skb_dequeue(skbs))) { 385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 386 387 if (WARN_ON(!info->control.vif)) { 388 kfree_skb(skb); 389 continue; 390 } 391 392 ret++; 393 queue = skb_get_queue_mapping(skb); 394 __skb_queue_tail(&local->pending[queue], skb); 395 } 396 397 for (i = 0; i < hw->queues; i++) 398 __ieee80211_wake_queue(hw, i, 399 IEEE80211_QUEUE_STOP_REASON_SKB_ADD); 400 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 401 402 return ret; 403 } 404 405 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw, 406 enum queue_stop_reason reason) 407 { 408 struct ieee80211_local *local = hw_to_local(hw); 409 unsigned long flags; 410 int i; 411 412 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 413 414 for (i = 0; i < hw->queues; i++) 415 __ieee80211_stop_queue(hw, i, reason); 416 417 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 418 } 419 420 void ieee80211_stop_queues(struct ieee80211_hw *hw) 421 { 422 ieee80211_stop_queues_by_reason(hw, 423 IEEE80211_QUEUE_STOP_REASON_DRIVER); 424 } 425 EXPORT_SYMBOL(ieee80211_stop_queues); 426 427 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue) 428 { 429 struct ieee80211_local *local = hw_to_local(hw); 430 unsigned long flags; 431 int ret; 432 433 if (WARN_ON(queue >= hw->queues)) 434 return true; 435 436 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 437 ret = !!local->queue_stop_reasons[queue]; 438 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 439 return ret; 440 } 441 EXPORT_SYMBOL(ieee80211_queue_stopped); 442 443 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw, 444 enum queue_stop_reason reason) 445 { 446 struct ieee80211_local *local = hw_to_local(hw); 447 unsigned long flags; 448 int i; 449 450 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 451 452 for (i = 0; i < hw->queues; i++) 453 __ieee80211_wake_queue(hw, i, reason); 454 455 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 456 } 457 458 void ieee80211_wake_queues(struct ieee80211_hw *hw) 459 { 460 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER); 461 } 462 EXPORT_SYMBOL(ieee80211_wake_queues); 463 464 void ieee80211_iterate_active_interfaces( 465 struct ieee80211_hw *hw, 466 void (*iterator)(void *data, u8 *mac, 467 struct ieee80211_vif *vif), 468 void *data) 469 { 470 struct ieee80211_local *local = hw_to_local(hw); 471 struct ieee80211_sub_if_data *sdata; 472 473 mutex_lock(&local->iflist_mtx); 474 475 list_for_each_entry(sdata, &local->interfaces, list) { 476 switch (sdata->vif.type) { 477 case NL80211_IFTYPE_MONITOR: 478 case NL80211_IFTYPE_AP_VLAN: 479 continue; 480 default: 481 break; 482 } 483 if (ieee80211_sdata_running(sdata)) 484 iterator(data, sdata->vif.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_MONITOR: 506 case NL80211_IFTYPE_AP_VLAN: 507 continue; 508 default: 509 break; 510 } 511 if (ieee80211_sdata_running(sdata)) 512 iterator(data, sdata->vif.addr, 513 &sdata->vif); 514 } 515 516 rcu_read_unlock(); 517 } 518 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic); 519 520 /* 521 * Nothing should have been stuffed into the workqueue during 522 * the suspend->resume cycle. If this WARN is seen then there 523 * is a bug with either the driver suspend or something in 524 * mac80211 stuffing into the workqueue which we haven't yet 525 * cleared during mac80211's suspend cycle. 526 */ 527 static bool ieee80211_can_queue_work(struct ieee80211_local *local) 528 { 529 if (WARN(local->suspended && !local->resuming, 530 "queueing ieee80211 work while going to suspend\n")) 531 return false; 532 533 return true; 534 } 535 536 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work) 537 { 538 struct ieee80211_local *local = hw_to_local(hw); 539 540 if (!ieee80211_can_queue_work(local)) 541 return; 542 543 queue_work(local->workqueue, work); 544 } 545 EXPORT_SYMBOL(ieee80211_queue_work); 546 547 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw, 548 struct delayed_work *dwork, 549 unsigned long delay) 550 { 551 struct ieee80211_local *local = hw_to_local(hw); 552 553 if (!ieee80211_can_queue_work(local)) 554 return; 555 556 queue_delayed_work(local->workqueue, dwork, delay); 557 } 558 EXPORT_SYMBOL(ieee80211_queue_delayed_work); 559 560 void ieee802_11_parse_elems(u8 *start, size_t len, 561 struct ieee802_11_elems *elems) 562 { 563 ieee802_11_parse_elems_crc(start, len, elems, 0, 0); 564 } 565 566 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, 567 struct ieee802_11_elems *elems, 568 u64 filter, u32 crc) 569 { 570 size_t left = len; 571 u8 *pos = start; 572 bool calc_crc = filter != 0; 573 574 memset(elems, 0, sizeof(*elems)); 575 elems->ie_start = start; 576 elems->total_len = len; 577 578 while (left >= 2) { 579 u8 id, elen; 580 581 id = *pos++; 582 elen = *pos++; 583 left -= 2; 584 585 if (elen > left) 586 break; 587 588 if (calc_crc && id < 64 && (filter & (1ULL << id))) 589 crc = crc32_be(crc, pos - 2, elen + 2); 590 591 switch (id) { 592 case WLAN_EID_SSID: 593 elems->ssid = pos; 594 elems->ssid_len = elen; 595 break; 596 case WLAN_EID_SUPP_RATES: 597 elems->supp_rates = pos; 598 elems->supp_rates_len = elen; 599 break; 600 case WLAN_EID_FH_PARAMS: 601 elems->fh_params = pos; 602 elems->fh_params_len = elen; 603 break; 604 case WLAN_EID_DS_PARAMS: 605 elems->ds_params = pos; 606 elems->ds_params_len = elen; 607 break; 608 case WLAN_EID_CF_PARAMS: 609 elems->cf_params = pos; 610 elems->cf_params_len = elen; 611 break; 612 case WLAN_EID_TIM: 613 if (elen >= sizeof(struct ieee80211_tim_ie)) { 614 elems->tim = (void *)pos; 615 elems->tim_len = elen; 616 } 617 break; 618 case WLAN_EID_IBSS_PARAMS: 619 elems->ibss_params = pos; 620 elems->ibss_params_len = elen; 621 break; 622 case WLAN_EID_CHALLENGE: 623 elems->challenge = pos; 624 elems->challenge_len = elen; 625 break; 626 case WLAN_EID_VENDOR_SPECIFIC: 627 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && 628 pos[2] == 0xf2) { 629 /* Microsoft OUI (00:50:F2) */ 630 631 if (calc_crc) 632 crc = crc32_be(crc, pos - 2, elen + 2); 633 634 if (pos[3] == 1) { 635 /* OUI Type 1 - WPA IE */ 636 elems->wpa = pos; 637 elems->wpa_len = elen; 638 } else if (elen >= 5 && pos[3] == 2) { 639 /* OUI Type 2 - WMM IE */ 640 if (pos[4] == 0) { 641 elems->wmm_info = pos; 642 elems->wmm_info_len = elen; 643 } else if (pos[4] == 1) { 644 elems->wmm_param = pos; 645 elems->wmm_param_len = elen; 646 } 647 } 648 } 649 break; 650 case WLAN_EID_RSN: 651 elems->rsn = pos; 652 elems->rsn_len = elen; 653 break; 654 case WLAN_EID_ERP_INFO: 655 elems->erp_info = pos; 656 elems->erp_info_len = elen; 657 break; 658 case WLAN_EID_EXT_SUPP_RATES: 659 elems->ext_supp_rates = pos; 660 elems->ext_supp_rates_len = elen; 661 break; 662 case WLAN_EID_HT_CAPABILITY: 663 if (elen >= sizeof(struct ieee80211_ht_cap)) 664 elems->ht_cap_elem = (void *)pos; 665 break; 666 case WLAN_EID_HT_INFORMATION: 667 if (elen >= sizeof(struct ieee80211_ht_info)) 668 elems->ht_info_elem = (void *)pos; 669 break; 670 case WLAN_EID_MESH_ID: 671 elems->mesh_id = pos; 672 elems->mesh_id_len = elen; 673 break; 674 case WLAN_EID_MESH_CONFIG: 675 if (elen >= sizeof(struct ieee80211_meshconf_ie)) 676 elems->mesh_config = (void *)pos; 677 break; 678 case WLAN_EID_PEER_LINK: 679 elems->peer_link = pos; 680 elems->peer_link_len = elen; 681 break; 682 case WLAN_EID_PREQ: 683 elems->preq = pos; 684 elems->preq_len = elen; 685 break; 686 case WLAN_EID_PREP: 687 elems->prep = pos; 688 elems->prep_len = elen; 689 break; 690 case WLAN_EID_PERR: 691 elems->perr = pos; 692 elems->perr_len = elen; 693 break; 694 case WLAN_EID_RANN: 695 if (elen >= sizeof(struct ieee80211_rann_ie)) 696 elems->rann = (void *)pos; 697 break; 698 case WLAN_EID_CHANNEL_SWITCH: 699 elems->ch_switch_elem = pos; 700 elems->ch_switch_elem_len = elen; 701 break; 702 case WLAN_EID_QUIET: 703 if (!elems->quiet_elem) { 704 elems->quiet_elem = pos; 705 elems->quiet_elem_len = elen; 706 } 707 elems->num_of_quiet_elem++; 708 break; 709 case WLAN_EID_COUNTRY: 710 elems->country_elem = pos; 711 elems->country_elem_len = elen; 712 break; 713 case WLAN_EID_PWR_CONSTRAINT: 714 elems->pwr_constr_elem = pos; 715 elems->pwr_constr_elem_len = elen; 716 break; 717 case WLAN_EID_TIMEOUT_INTERVAL: 718 elems->timeout_int = pos; 719 elems->timeout_int_len = elen; 720 break; 721 default: 722 break; 723 } 724 725 left -= elen; 726 pos += elen; 727 } 728 729 return crc; 730 } 731 732 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata) 733 { 734 struct ieee80211_local *local = sdata->local; 735 struct ieee80211_tx_queue_params qparam; 736 int queue; 737 bool use_11b; 738 int aCWmin, aCWmax; 739 740 if (!local->ops->conf_tx) 741 return; 742 743 memset(&qparam, 0, sizeof(qparam)); 744 745 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) && 746 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE); 747 748 for (queue = 0; queue < local_to_hw(local)->queues; queue++) { 749 /* Set defaults according to 802.11-2007 Table 7-37 */ 750 aCWmax = 1023; 751 if (use_11b) 752 aCWmin = 31; 753 else 754 aCWmin = 15; 755 756 switch (queue) { 757 case 3: /* AC_BK */ 758 qparam.cw_max = aCWmax; 759 qparam.cw_min = aCWmin; 760 qparam.txop = 0; 761 qparam.aifs = 7; 762 break; 763 default: /* never happens but let's not leave undefined */ 764 case 2: /* AC_BE */ 765 qparam.cw_max = aCWmax; 766 qparam.cw_min = aCWmin; 767 qparam.txop = 0; 768 qparam.aifs = 3; 769 break; 770 case 1: /* AC_VI */ 771 qparam.cw_max = aCWmin; 772 qparam.cw_min = (aCWmin + 1) / 2 - 1; 773 if (use_11b) 774 qparam.txop = 6016/32; 775 else 776 qparam.txop = 3008/32; 777 qparam.aifs = 2; 778 break; 779 case 0: /* AC_VO */ 780 qparam.cw_max = (aCWmin + 1) / 2 - 1; 781 qparam.cw_min = (aCWmin + 1) / 4 - 1; 782 if (use_11b) 783 qparam.txop = 3264/32; 784 else 785 qparam.txop = 1504/32; 786 qparam.aifs = 2; 787 break; 788 } 789 790 qparam.uapsd = false; 791 792 drv_conf_tx(local, queue, &qparam); 793 } 794 795 /* after reinitialize QoS TX queues setting to default, 796 * disable QoS at all */ 797 798 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { 799 sdata->vif.bss_conf.qos = 800 sdata->vif.type != NL80211_IFTYPE_STATION; 801 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS); 802 } 803 } 804 805 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata, 806 const size_t supp_rates_len, 807 const u8 *supp_rates) 808 { 809 struct ieee80211_local *local = sdata->local; 810 int i, have_higher_than_11mbit = 0; 811 812 /* cf. IEEE 802.11 9.2.12 */ 813 for (i = 0; i < supp_rates_len; i++) 814 if ((supp_rates[i] & 0x7f) * 5 > 110) 815 have_higher_than_11mbit = 1; 816 817 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 818 have_higher_than_11mbit) 819 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 820 else 821 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 822 823 ieee80211_set_wmm_default(sdata); 824 } 825 826 u32 ieee80211_mandatory_rates(struct ieee80211_local *local, 827 enum ieee80211_band band) 828 { 829 struct ieee80211_supported_band *sband; 830 struct ieee80211_rate *bitrates; 831 u32 mandatory_rates; 832 enum ieee80211_rate_flags mandatory_flag; 833 int i; 834 835 sband = local->hw.wiphy->bands[band]; 836 if (!sband) { 837 WARN_ON(1); 838 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 839 } 840 841 if (band == IEEE80211_BAND_2GHZ) 842 mandatory_flag = IEEE80211_RATE_MANDATORY_B; 843 else 844 mandatory_flag = IEEE80211_RATE_MANDATORY_A; 845 846 bitrates = sband->bitrates; 847 mandatory_rates = 0; 848 for (i = 0; i < sband->n_bitrates; i++) 849 if (bitrates[i].flags & mandatory_flag) 850 mandatory_rates |= BIT(i); 851 return mandatory_rates; 852 } 853 854 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, 855 u16 transaction, u16 auth_alg, 856 u8 *extra, size_t extra_len, const u8 *bssid, 857 const u8 *key, u8 key_len, u8 key_idx) 858 { 859 struct ieee80211_local *local = sdata->local; 860 struct sk_buff *skb; 861 struct ieee80211_mgmt *mgmt; 862 int err; 863 864 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 865 sizeof(*mgmt) + 6 + extra_len); 866 if (!skb) { 867 printk(KERN_DEBUG "%s: failed to allocate buffer for auth " 868 "frame\n", sdata->name); 869 return; 870 } 871 skb_reserve(skb, local->hw.extra_tx_headroom); 872 873 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); 874 memset(mgmt, 0, 24 + 6); 875 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 876 IEEE80211_STYPE_AUTH); 877 memcpy(mgmt->da, bssid, ETH_ALEN); 878 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 879 memcpy(mgmt->bssid, bssid, ETH_ALEN); 880 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg); 881 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); 882 mgmt->u.auth.status_code = cpu_to_le16(0); 883 if (extra) 884 memcpy(skb_put(skb, extra_len), extra, extra_len); 885 886 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) { 887 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 888 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx); 889 WARN_ON(err); 890 } 891 892 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 893 ieee80211_tx_skb(sdata, skb); 894 } 895 896 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, 897 const u8 *ie, size_t ie_len, 898 enum ieee80211_band band, u32 rate_mask, 899 u8 channel) 900 { 901 struct ieee80211_supported_band *sband; 902 u8 *pos; 903 size_t offset = 0, noffset; 904 int supp_rates_len, i; 905 u8 rates[32]; 906 int num_rates; 907 int ext_rates_len; 908 909 sband = local->hw.wiphy->bands[band]; 910 911 pos = buffer; 912 913 num_rates = 0; 914 for (i = 0; i < sband->n_bitrates; i++) { 915 if ((BIT(i) & rate_mask) == 0) 916 continue; /* skip rate */ 917 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5); 918 } 919 920 supp_rates_len = min_t(int, num_rates, 8); 921 922 *pos++ = WLAN_EID_SUPP_RATES; 923 *pos++ = supp_rates_len; 924 memcpy(pos, rates, supp_rates_len); 925 pos += supp_rates_len; 926 927 /* insert "request information" if in custom IEs */ 928 if (ie && ie_len) { 929 static const u8 before_extrates[] = { 930 WLAN_EID_SSID, 931 WLAN_EID_SUPP_RATES, 932 WLAN_EID_REQUEST, 933 }; 934 noffset = ieee80211_ie_split(ie, ie_len, 935 before_extrates, 936 ARRAY_SIZE(before_extrates), 937 offset); 938 memcpy(pos, ie + offset, noffset - offset); 939 pos += noffset - offset; 940 offset = noffset; 941 } 942 943 ext_rates_len = num_rates - supp_rates_len; 944 if (ext_rates_len > 0) { 945 *pos++ = WLAN_EID_EXT_SUPP_RATES; 946 *pos++ = ext_rates_len; 947 memcpy(pos, rates + supp_rates_len, ext_rates_len); 948 pos += ext_rates_len; 949 } 950 951 if (channel && sband->band == IEEE80211_BAND_2GHZ) { 952 *pos++ = WLAN_EID_DS_PARAMS; 953 *pos++ = 1; 954 *pos++ = channel; 955 } 956 957 /* insert custom IEs that go before HT */ 958 if (ie && ie_len) { 959 static const u8 before_ht[] = { 960 WLAN_EID_SSID, 961 WLAN_EID_SUPP_RATES, 962 WLAN_EID_REQUEST, 963 WLAN_EID_EXT_SUPP_RATES, 964 WLAN_EID_DS_PARAMS, 965 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 966 }; 967 noffset = ieee80211_ie_split(ie, ie_len, 968 before_ht, ARRAY_SIZE(before_ht), 969 offset); 970 memcpy(pos, ie + offset, noffset - offset); 971 pos += noffset - offset; 972 offset = noffset; 973 } 974 975 if (sband->ht_cap.ht_supported) { 976 u16 cap = sband->ht_cap.cap; 977 __le16 tmp; 978 979 if (ieee80211_disable_40mhz_24ghz && 980 sband->band == IEEE80211_BAND_2GHZ) { 981 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 982 cap &= ~IEEE80211_HT_CAP_SGI_40; 983 } 984 985 *pos++ = WLAN_EID_HT_CAPABILITY; 986 *pos++ = sizeof(struct ieee80211_ht_cap); 987 memset(pos, 0, sizeof(struct ieee80211_ht_cap)); 988 tmp = cpu_to_le16(cap); 989 memcpy(pos, &tmp, sizeof(u16)); 990 pos += sizeof(u16); 991 *pos++ = sband->ht_cap.ampdu_factor | 992 (sband->ht_cap.ampdu_density << 993 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT); 994 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); 995 pos += sizeof(sband->ht_cap.mcs); 996 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */ 997 } 998 999 /* 1000 * If adding more here, adjust code in main.c 1001 * that calculates local->scan_ies_len. 1002 */ 1003 1004 /* add any remaining custom IEs */ 1005 if (ie && ie_len) { 1006 noffset = ie_len; 1007 memcpy(pos, ie + offset, noffset - offset); 1008 pos += noffset - offset; 1009 } 1010 1011 return pos - buffer; 1012 } 1013 1014 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, 1015 const u8 *ssid, size_t ssid_len, 1016 const u8 *ie, size_t ie_len) 1017 { 1018 struct ieee80211_local *local = sdata->local; 1019 struct sk_buff *skb; 1020 struct ieee80211_mgmt *mgmt; 1021 size_t buf_len; 1022 u8 *buf; 1023 u8 chan; 1024 1025 /* FIXME: come up with a proper value */ 1026 buf = kmalloc(200 + ie_len, GFP_KERNEL); 1027 if (!buf) { 1028 printk(KERN_DEBUG "%s: failed to allocate temporary IE " 1029 "buffer\n", sdata->name); 1030 return; 1031 } 1032 1033 chan = ieee80211_frequency_to_channel( 1034 local->hw.conf.channel->center_freq); 1035 1036 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, 1037 local->hw.conf.channel->band, 1038 sdata->rc_rateidx_mask 1039 [local->hw.conf.channel->band], 1040 chan); 1041 1042 skb = ieee80211_probereq_get(&local->hw, &sdata->vif, 1043 ssid, ssid_len, 1044 buf, buf_len); 1045 1046 if (dst) { 1047 mgmt = (struct ieee80211_mgmt *) skb->data; 1048 memcpy(mgmt->da, dst, ETH_ALEN); 1049 memcpy(mgmt->bssid, dst, ETH_ALEN); 1050 } 1051 1052 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1053 ieee80211_tx_skb(sdata, skb); 1054 kfree(buf); 1055 } 1056 1057 u32 ieee80211_sta_get_rates(struct ieee80211_local *local, 1058 struct ieee802_11_elems *elems, 1059 enum ieee80211_band band) 1060 { 1061 struct ieee80211_supported_band *sband; 1062 struct ieee80211_rate *bitrates; 1063 size_t num_rates; 1064 u32 supp_rates; 1065 int i, j; 1066 sband = local->hw.wiphy->bands[band]; 1067 1068 if (!sband) { 1069 WARN_ON(1); 1070 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1071 } 1072 1073 bitrates = sband->bitrates; 1074 num_rates = sband->n_bitrates; 1075 supp_rates = 0; 1076 for (i = 0; i < elems->supp_rates_len + 1077 elems->ext_supp_rates_len; i++) { 1078 u8 rate = 0; 1079 int own_rate; 1080 if (i < elems->supp_rates_len) 1081 rate = elems->supp_rates[i]; 1082 else if (elems->ext_supp_rates) 1083 rate = elems->ext_supp_rates 1084 [i - elems->supp_rates_len]; 1085 own_rate = 5 * (rate & 0x7f); 1086 for (j = 0; j < num_rates; j++) 1087 if (bitrates[j].bitrate == own_rate) 1088 supp_rates |= BIT(j); 1089 } 1090 return supp_rates; 1091 } 1092 1093 void ieee80211_stop_device(struct ieee80211_local *local) 1094 { 1095 ieee80211_led_radio(local, false); 1096 1097 cancel_work_sync(&local->reconfig_filter); 1098 1099 flush_workqueue(local->workqueue); 1100 drv_stop(local); 1101 } 1102 1103 int ieee80211_reconfig(struct ieee80211_local *local) 1104 { 1105 struct ieee80211_hw *hw = &local->hw; 1106 struct ieee80211_sub_if_data *sdata; 1107 struct sta_info *sta; 1108 int res; 1109 1110 if (local->suspended) 1111 local->resuming = true; 1112 1113 /* restart hardware */ 1114 if (local->open_count) { 1115 /* 1116 * Upon resume hardware can sometimes be goofy due to 1117 * various platform / driver / bus issues, so restarting 1118 * the device may at times not work immediately. Propagate 1119 * the error. 1120 */ 1121 res = drv_start(local); 1122 if (res) { 1123 WARN(local->suspended, "Hardware became unavailable " 1124 "upon resume. This could be a software issue " 1125 "prior to suspend or a hardware issue.\n"); 1126 return res; 1127 } 1128 1129 ieee80211_led_radio(local, true); 1130 } 1131 1132 /* add interfaces */ 1133 list_for_each_entry(sdata, &local->interfaces, list) { 1134 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 1135 sdata->vif.type != NL80211_IFTYPE_MONITOR && 1136 ieee80211_sdata_running(sdata)) 1137 res = drv_add_interface(local, &sdata->vif); 1138 } 1139 1140 /* add STAs back */ 1141 mutex_lock(&local->sta_mtx); 1142 list_for_each_entry(sta, &local->sta_list, list) { 1143 if (sta->uploaded) { 1144 sdata = sta->sdata; 1145 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1146 sdata = container_of(sdata->bss, 1147 struct ieee80211_sub_if_data, 1148 u.ap); 1149 1150 WARN_ON(drv_sta_add(local, sdata, &sta->sta)); 1151 } 1152 } 1153 mutex_unlock(&local->sta_mtx); 1154 1155 /* setup RTS threshold */ 1156 drv_set_rts_threshold(local, hw->wiphy->rts_threshold); 1157 1158 /* reconfigure hardware */ 1159 ieee80211_hw_config(local, ~0); 1160 1161 ieee80211_configure_filter(local); 1162 1163 /* Finally also reconfigure all the BSS information */ 1164 list_for_each_entry(sdata, &local->interfaces, list) { 1165 u32 changed; 1166 1167 if (!ieee80211_sdata_running(sdata)) 1168 continue; 1169 1170 /* common change flags for all interface types */ 1171 changed = BSS_CHANGED_ERP_CTS_PROT | 1172 BSS_CHANGED_ERP_PREAMBLE | 1173 BSS_CHANGED_ERP_SLOT | 1174 BSS_CHANGED_HT | 1175 BSS_CHANGED_BASIC_RATES | 1176 BSS_CHANGED_BEACON_INT | 1177 BSS_CHANGED_BSSID | 1178 BSS_CHANGED_CQM | 1179 BSS_CHANGED_QOS; 1180 1181 switch (sdata->vif.type) { 1182 case NL80211_IFTYPE_STATION: 1183 changed |= BSS_CHANGED_ASSOC; 1184 ieee80211_bss_info_change_notify(sdata, changed); 1185 break; 1186 case NL80211_IFTYPE_ADHOC: 1187 changed |= BSS_CHANGED_IBSS; 1188 /* fall through */ 1189 case NL80211_IFTYPE_AP: 1190 case NL80211_IFTYPE_MESH_POINT: 1191 changed |= BSS_CHANGED_BEACON | 1192 BSS_CHANGED_BEACON_ENABLED; 1193 ieee80211_bss_info_change_notify(sdata, changed); 1194 break; 1195 case NL80211_IFTYPE_WDS: 1196 break; 1197 case NL80211_IFTYPE_AP_VLAN: 1198 case NL80211_IFTYPE_MONITOR: 1199 /* ignore virtual */ 1200 break; 1201 case NL80211_IFTYPE_UNSPECIFIED: 1202 case NUM_NL80211_IFTYPES: 1203 case NL80211_IFTYPE_P2P_CLIENT: 1204 case NL80211_IFTYPE_P2P_GO: 1205 WARN_ON(1); 1206 break; 1207 } 1208 } 1209 1210 /* 1211 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation 1212 * sessions can be established after a resume. 1213 * 1214 * Also tear down aggregation sessions since reconfiguring 1215 * them in a hardware restart scenario is not easily done 1216 * right now, and the hardware will have lost information 1217 * about the sessions, but we and the AP still think they 1218 * are active. This is really a workaround though. 1219 */ 1220 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) { 1221 mutex_lock(&local->sta_mtx); 1222 1223 list_for_each_entry(sta, &local->sta_list, list) { 1224 ieee80211_sta_tear_down_BA_sessions(sta, true); 1225 clear_sta_flags(sta, WLAN_STA_BLOCK_BA); 1226 } 1227 1228 mutex_unlock(&local->sta_mtx); 1229 } 1230 1231 /* add back keys */ 1232 list_for_each_entry(sdata, &local->interfaces, list) 1233 if (ieee80211_sdata_running(sdata)) 1234 ieee80211_enable_keys(sdata); 1235 1236 ieee80211_wake_queues_by_reason(hw, 1237 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 1238 1239 /* 1240 * If this is for hw restart things are still running. 1241 * We may want to change that later, however. 1242 */ 1243 if (!local->suspended) 1244 return 0; 1245 1246 #ifdef CONFIG_PM 1247 /* first set suspended false, then resuming */ 1248 local->suspended = false; 1249 mb(); 1250 local->resuming = false; 1251 1252 list_for_each_entry(sdata, &local->interfaces, list) { 1253 switch(sdata->vif.type) { 1254 case NL80211_IFTYPE_STATION: 1255 ieee80211_sta_restart(sdata); 1256 break; 1257 case NL80211_IFTYPE_ADHOC: 1258 ieee80211_ibss_restart(sdata); 1259 break; 1260 case NL80211_IFTYPE_MESH_POINT: 1261 ieee80211_mesh_restart(sdata); 1262 break; 1263 default: 1264 break; 1265 } 1266 } 1267 1268 add_timer(&local->sta_cleanup); 1269 1270 mutex_lock(&local->sta_mtx); 1271 list_for_each_entry(sta, &local->sta_list, list) 1272 mesh_plink_restart(sta); 1273 mutex_unlock(&local->sta_mtx); 1274 #else 1275 WARN_ON(1); 1276 #endif 1277 return 0; 1278 } 1279 1280 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd, 1281 enum ieee80211_smps_mode *smps_mode) 1282 { 1283 if (ifmgd->associated) { 1284 *smps_mode = ifmgd->ap_smps; 1285 1286 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) { 1287 if (ifmgd->powersave) 1288 *smps_mode = IEEE80211_SMPS_DYNAMIC; 1289 else 1290 *smps_mode = IEEE80211_SMPS_OFF; 1291 } 1292 1293 return 1; 1294 } 1295 1296 return 0; 1297 } 1298 1299 /* must hold iflist_mtx */ 1300 void ieee80211_recalc_smps(struct ieee80211_local *local) 1301 { 1302 struct ieee80211_sub_if_data *sdata; 1303 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF; 1304 int count = 0; 1305 1306 lockdep_assert_held(&local->iflist_mtx); 1307 1308 /* 1309 * This function could be improved to handle multiple 1310 * interfaces better, but right now it makes any 1311 * non-station interfaces force SM PS to be turned 1312 * off. If there are multiple station interfaces it 1313 * could also use the best possible mode, e.g. if 1314 * one is in static and the other in dynamic then 1315 * dynamic is ok. 1316 */ 1317 1318 list_for_each_entry(sdata, &local->interfaces, list) { 1319 if (!ieee80211_sdata_running(sdata)) 1320 continue; 1321 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1322 goto set; 1323 1324 count += check_mgd_smps(&sdata->u.mgd, &smps_mode); 1325 1326 if (count > 1) { 1327 smps_mode = IEEE80211_SMPS_OFF; 1328 break; 1329 } 1330 } 1331 1332 if (smps_mode == local->smps_mode) 1333 return; 1334 1335 set: 1336 local->smps_mode = smps_mode; 1337 /* changed flag is auto-detected for this */ 1338 ieee80211_hw_config(local, 0); 1339 } 1340 1341 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id) 1342 { 1343 int i; 1344 1345 for (i = 0; i < n_ids; i++) 1346 if (ids[i] == id) 1347 return true; 1348 return false; 1349 } 1350 1351 /** 1352 * ieee80211_ie_split - split an IE buffer according to ordering 1353 * 1354 * @ies: the IE buffer 1355 * @ielen: the length of the IE buffer 1356 * @ids: an array with element IDs that are allowed before 1357 * the split 1358 * @n_ids: the size of the element ID array 1359 * @offset: offset where to start splitting in the buffer 1360 * 1361 * This function splits an IE buffer by updating the @offset 1362 * variable to point to the location where the buffer should be 1363 * split. 1364 * 1365 * It assumes that the given IE buffer is well-formed, this 1366 * has to be guaranteed by the caller! 1367 * 1368 * It also assumes that the IEs in the buffer are ordered 1369 * correctly, if not the result of using this function will not 1370 * be ordered correctly either, i.e. it does no reordering. 1371 * 1372 * The function returns the offset where the next part of the 1373 * buffer starts, which may be @ielen if the entire (remainder) 1374 * of the buffer should be used. 1375 */ 1376 size_t ieee80211_ie_split(const u8 *ies, size_t ielen, 1377 const u8 *ids, int n_ids, size_t offset) 1378 { 1379 size_t pos = offset; 1380 1381 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) 1382 pos += 2 + ies[pos + 1]; 1383 1384 return pos; 1385 } 1386 1387 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset) 1388 { 1389 size_t pos = offset; 1390 1391 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC) 1392 pos += 2 + ies[pos + 1]; 1393 1394 return pos; 1395 } 1396