1 /* 2 * Scanning implementation 3 * 4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 5 * Copyright 2004, Instant802 Networks, Inc. 6 * Copyright 2005, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 /* TODO: 16 * order BSS list by RSSI(?) ("quality of AP") 17 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE, 18 * SSID) 19 */ 20 21 #include <linux/wireless.h> 22 #include <linux/if_arp.h> 23 #include <net/mac80211.h> 24 #include <net/iw_handler.h> 25 26 #include "ieee80211_i.h" 27 #include "mesh.h" 28 29 #define IEEE80211_PROBE_DELAY (HZ / 33) 30 #define IEEE80211_CHANNEL_TIME (HZ / 33) 31 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) 32 33 void ieee80211_rx_bss_list_init(struct ieee80211_local *local) 34 { 35 spin_lock_init(&local->bss_lock); 36 INIT_LIST_HEAD(&local->bss_list); 37 } 38 39 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local) 40 { 41 struct ieee80211_bss *bss, *tmp; 42 43 list_for_each_entry_safe(bss, tmp, &local->bss_list, list) 44 ieee80211_rx_bss_put(local, bss); 45 } 46 47 struct ieee80211_bss * 48 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, 49 u8 *ssid, u8 ssid_len) 50 { 51 struct ieee80211_bss *bss; 52 53 spin_lock_bh(&local->bss_lock); 54 bss = local->bss_hash[STA_HASH(bssid)]; 55 while (bss) { 56 if (!bss_mesh_cfg(bss) && 57 !memcmp(bss->bssid, bssid, ETH_ALEN) && 58 bss->freq == freq && 59 bss->ssid_len == ssid_len && 60 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) { 61 atomic_inc(&bss->users); 62 break; 63 } 64 bss = bss->hnext; 65 } 66 spin_unlock_bh(&local->bss_lock); 67 return bss; 68 } 69 70 /* Caller must hold local->bss_lock */ 71 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local, 72 struct ieee80211_bss *bss) 73 { 74 u8 hash_idx; 75 76 if (bss_mesh_cfg(bss)) 77 hash_idx = mesh_id_hash(bss_mesh_id(bss), 78 bss_mesh_id_len(bss)); 79 else 80 hash_idx = STA_HASH(bss->bssid); 81 82 bss->hnext = local->bss_hash[hash_idx]; 83 local->bss_hash[hash_idx] = bss; 84 } 85 86 /* Caller must hold local->bss_lock */ 87 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local, 88 struct ieee80211_bss *bss) 89 { 90 struct ieee80211_bss *b, *prev = NULL; 91 b = local->bss_hash[STA_HASH(bss->bssid)]; 92 while (b) { 93 if (b == bss) { 94 if (!prev) 95 local->bss_hash[STA_HASH(bss->bssid)] = 96 bss->hnext; 97 else 98 prev->hnext = bss->hnext; 99 break; 100 } 101 prev = b; 102 b = b->hnext; 103 } 104 } 105 106 struct ieee80211_bss * 107 ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq, 108 u8 *ssid, u8 ssid_len) 109 { 110 struct ieee80211_bss *bss; 111 112 bss = kzalloc(sizeof(*bss), GFP_ATOMIC); 113 if (!bss) 114 return NULL; 115 atomic_set(&bss->users, 2); 116 memcpy(bss->bssid, bssid, ETH_ALEN); 117 bss->freq = freq; 118 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) { 119 memcpy(bss->ssid, ssid, ssid_len); 120 bss->ssid_len = ssid_len; 121 } 122 123 spin_lock_bh(&local->bss_lock); 124 /* TODO: order by RSSI? */ 125 list_add_tail(&bss->list, &local->bss_list); 126 __ieee80211_rx_bss_hash_add(local, bss); 127 spin_unlock_bh(&local->bss_lock); 128 return bss; 129 } 130 131 #ifdef CONFIG_MAC80211_MESH 132 static struct ieee80211_bss * 133 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len, 134 u8 *mesh_cfg, int freq) 135 { 136 struct ieee80211_bss *bss; 137 138 spin_lock_bh(&local->bss_lock); 139 bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)]; 140 while (bss) { 141 if (bss_mesh_cfg(bss) && 142 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) && 143 bss->freq == freq && 144 mesh_id_len == bss->mesh_id_len && 145 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id, 146 mesh_id_len))) { 147 atomic_inc(&bss->users); 148 break; 149 } 150 bss = bss->hnext; 151 } 152 spin_unlock_bh(&local->bss_lock); 153 return bss; 154 } 155 156 static struct ieee80211_bss * 157 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len, 158 u8 *mesh_cfg, int mesh_config_len, int freq) 159 { 160 struct ieee80211_bss *bss; 161 162 if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN) 163 return NULL; 164 165 bss = kzalloc(sizeof(*bss), GFP_ATOMIC); 166 if (!bss) 167 return NULL; 168 169 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC); 170 if (!bss->mesh_cfg) { 171 kfree(bss); 172 return NULL; 173 } 174 175 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) { 176 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC); 177 if (!bss->mesh_id) { 178 kfree(bss->mesh_cfg); 179 kfree(bss); 180 return NULL; 181 } 182 memcpy(bss->mesh_id, mesh_id, mesh_id_len); 183 } 184 185 atomic_set(&bss->users, 2); 186 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN); 187 bss->mesh_id_len = mesh_id_len; 188 bss->freq = freq; 189 spin_lock_bh(&local->bss_lock); 190 /* TODO: order by RSSI? */ 191 list_add_tail(&bss->list, &local->bss_list); 192 __ieee80211_rx_bss_hash_add(local, bss); 193 spin_unlock_bh(&local->bss_lock); 194 return bss; 195 } 196 #endif 197 198 static void ieee80211_rx_bss_free(struct ieee80211_bss *bss) 199 { 200 kfree(bss->ies); 201 kfree(bss_mesh_id(bss)); 202 kfree(bss_mesh_cfg(bss)); 203 kfree(bss); 204 } 205 206 void ieee80211_rx_bss_put(struct ieee80211_local *local, 207 struct ieee80211_bss *bss) 208 { 209 local_bh_disable(); 210 if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) { 211 local_bh_enable(); 212 return; 213 } 214 215 __ieee80211_rx_bss_hash_del(local, bss); 216 list_del(&bss->list); 217 spin_unlock_bh(&local->bss_lock); 218 ieee80211_rx_bss_free(bss); 219 } 220 221 struct ieee80211_bss * 222 ieee80211_bss_info_update(struct ieee80211_local *local, 223 struct ieee80211_rx_status *rx_status, 224 struct ieee80211_mgmt *mgmt, 225 size_t len, 226 struct ieee802_11_elems *elems, 227 int freq, bool beacon) 228 { 229 struct ieee80211_bss *bss; 230 int clen; 231 232 #ifdef CONFIG_MAC80211_MESH 233 if (elems->mesh_config) 234 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id, 235 elems->mesh_id_len, elems->mesh_config, freq); 236 else 237 #endif 238 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq, 239 elems->ssid, elems->ssid_len); 240 if (!bss) { 241 #ifdef CONFIG_MAC80211_MESH 242 if (elems->mesh_config) 243 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id, 244 elems->mesh_id_len, elems->mesh_config, 245 elems->mesh_config_len, freq); 246 else 247 #endif 248 bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq, 249 elems->ssid, elems->ssid_len); 250 if (!bss) 251 return NULL; 252 } else { 253 #if 0 254 /* TODO: order by RSSI? */ 255 spin_lock_bh(&local->bss_lock); 256 list_move_tail(&bss->list, &local->bss_list); 257 spin_unlock_bh(&local->bss_lock); 258 #endif 259 } 260 261 /* save the ERP value so that it is available at association time */ 262 if (elems->erp_info && elems->erp_info_len >= 1) { 263 bss->erp_value = elems->erp_info[0]; 264 bss->has_erp_value = 1; 265 } 266 267 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int); 268 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info); 269 270 if (elems->tim) { 271 struct ieee80211_tim_ie *tim_ie = 272 (struct ieee80211_tim_ie *)elems->tim; 273 bss->dtim_period = tim_ie->dtim_period; 274 } 275 276 /* set default value for buggy APs */ 277 if (!elems->tim || bss->dtim_period == 0) 278 bss->dtim_period = 1; 279 280 bss->supp_rates_len = 0; 281 if (elems->supp_rates) { 282 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; 283 if (clen > elems->supp_rates_len) 284 clen = elems->supp_rates_len; 285 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, 286 clen); 287 bss->supp_rates_len += clen; 288 } 289 if (elems->ext_supp_rates) { 290 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; 291 if (clen > elems->ext_supp_rates_len) 292 clen = elems->ext_supp_rates_len; 293 memcpy(&bss->supp_rates[bss->supp_rates_len], 294 elems->ext_supp_rates, clen); 295 bss->supp_rates_len += clen; 296 } 297 298 bss->band = rx_status->band; 299 300 bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 301 bss->last_update = jiffies; 302 bss->signal = rx_status->signal; 303 bss->noise = rx_status->noise; 304 bss->qual = rx_status->qual; 305 bss->wmm_used = elems->wmm_param || elems->wmm_info; 306 307 if (!beacon) 308 bss->last_probe_resp = jiffies; 309 310 /* 311 * For probe responses, or if we don't have any information yet, 312 * use the IEs from the beacon. 313 */ 314 if (!bss->ies || !beacon) { 315 if (bss->ies == NULL || bss->ies_len < elems->total_len) { 316 kfree(bss->ies); 317 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC); 318 } 319 if (bss->ies) { 320 memcpy(bss->ies, elems->ie_start, elems->total_len); 321 bss->ies_len = elems->total_len; 322 } else 323 bss->ies_len = 0; 324 } 325 326 return bss; 327 } 328 329 ieee80211_rx_result 330 ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 331 struct ieee80211_rx_status *rx_status) 332 { 333 struct ieee80211_mgmt *mgmt; 334 struct ieee80211_bss *bss; 335 u8 *elements; 336 struct ieee80211_channel *channel; 337 size_t baselen; 338 int freq; 339 __le16 fc; 340 bool presp, beacon = false; 341 struct ieee802_11_elems elems; 342 343 if (skb->len < 2) 344 return RX_DROP_UNUSABLE; 345 346 mgmt = (struct ieee80211_mgmt *) skb->data; 347 fc = mgmt->frame_control; 348 349 if (ieee80211_is_ctl(fc)) 350 return RX_CONTINUE; 351 352 if (skb->len < 24) 353 return RX_DROP_MONITOR; 354 355 presp = ieee80211_is_probe_resp(fc); 356 if (presp) { 357 /* ignore ProbeResp to foreign address */ 358 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) 359 return RX_DROP_MONITOR; 360 361 presp = true; 362 elements = mgmt->u.probe_resp.variable; 363 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 364 } else { 365 beacon = ieee80211_is_beacon(fc); 366 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 367 elements = mgmt->u.beacon.variable; 368 } 369 370 if (!presp && !beacon) 371 return RX_CONTINUE; 372 373 if (baselen > skb->len) 374 return RX_DROP_MONITOR; 375 376 ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 377 378 if (elems.ds_params && elems.ds_params_len == 1) 379 freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 380 else 381 freq = rx_status->freq; 382 383 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 384 385 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 386 return RX_DROP_MONITOR; 387 388 bss = ieee80211_bss_info_update(sdata->local, rx_status, 389 mgmt, skb->len, &elems, 390 freq, beacon); 391 if (bss) 392 ieee80211_rx_bss_put(sdata->local, bss); 393 394 dev_kfree_skb(skb); 395 return RX_QUEUED; 396 } 397 398 static void ieee80211_send_nullfunc(struct ieee80211_local *local, 399 struct ieee80211_sub_if_data *sdata, 400 int powersave) 401 { 402 struct sk_buff *skb; 403 struct ieee80211_hdr *nullfunc; 404 __le16 fc; 405 406 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); 407 if (!skb) { 408 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " 409 "frame\n", sdata->dev->name); 410 return; 411 } 412 skb_reserve(skb, local->hw.extra_tx_headroom); 413 414 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); 415 memset(nullfunc, 0, 24); 416 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | 417 IEEE80211_FCTL_TODS); 418 if (powersave) 419 fc |= cpu_to_le16(IEEE80211_FCTL_PM); 420 nullfunc->frame_control = fc; 421 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); 422 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); 423 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); 424 425 ieee80211_tx_skb(sdata, skb, 0); 426 } 427 428 void ieee80211_scan_completed(struct ieee80211_hw *hw) 429 { 430 struct ieee80211_local *local = hw_to_local(hw); 431 struct ieee80211_sub_if_data *sdata; 432 union iwreq_data wrqu; 433 434 if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) 435 return; 436 437 local->last_scan_completed = jiffies; 438 memset(&wrqu, 0, sizeof(wrqu)); 439 440 /* 441 * local->scan_sdata could have been NULLed by the interface 442 * down code in case we were scanning on an interface that is 443 * being taken down. 444 */ 445 sdata = local->scan_sdata; 446 if (sdata) 447 wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL); 448 449 if (local->hw_scanning) { 450 local->hw_scanning = false; 451 /* 452 * Somebody might have requested channel change during scan 453 * that we won't have acted upon, try now. ieee80211_hw_config 454 * will set the flag based on actual changes. 455 */ 456 ieee80211_hw_config(local, 0); 457 goto done; 458 } 459 460 local->sw_scanning = false; 461 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 462 463 netif_tx_lock_bh(local->mdev); 464 netif_addr_lock(local->mdev); 465 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; 466 local->ops->configure_filter(local_to_hw(local), 467 FIF_BCN_PRBRESP_PROMISC, 468 &local->filter_flags, 469 local->mdev->mc_count, 470 local->mdev->mc_list); 471 472 netif_addr_unlock(local->mdev); 473 netif_tx_unlock_bh(local->mdev); 474 475 rcu_read_lock(); 476 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 477 /* Tell AP we're back */ 478 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 479 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 480 ieee80211_send_nullfunc(local, sdata, 0); 481 netif_tx_wake_all_queues(sdata->dev); 482 } 483 } else 484 netif_tx_wake_all_queues(sdata->dev); 485 } 486 rcu_read_unlock(); 487 488 done: 489 ieee80211_mlme_notify_scan_completed(local); 490 ieee80211_mesh_notify_scan_completed(local); 491 } 492 EXPORT_SYMBOL(ieee80211_scan_completed); 493 494 495 void ieee80211_scan_work(struct work_struct *work) 496 { 497 struct ieee80211_local *local = 498 container_of(work, struct ieee80211_local, scan_work.work); 499 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 500 struct ieee80211_supported_band *sband; 501 struct ieee80211_channel *chan; 502 int skip; 503 unsigned long next_delay = 0; 504 505 /* 506 * Avoid re-scheduling when the sdata is going away. 507 */ 508 if (!netif_running(sdata->dev)) 509 return; 510 511 switch (local->scan_state) { 512 case SCAN_SET_CHANNEL: 513 /* 514 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS 515 * after we successfully scanned the last channel of the last 516 * band (and the last band is supported by the hw) 517 */ 518 if (local->scan_band < IEEE80211_NUM_BANDS) 519 sband = local->hw.wiphy->bands[local->scan_band]; 520 else 521 sband = NULL; 522 523 /* 524 * If we are at an unsupported band and have more bands 525 * left to scan, advance to the next supported one. 526 */ 527 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { 528 local->scan_band++; 529 sband = local->hw.wiphy->bands[local->scan_band]; 530 local->scan_channel_idx = 0; 531 } 532 533 /* if no more bands/channels left, complete scan */ 534 if (!sband || local->scan_channel_idx >= sband->n_channels) { 535 ieee80211_scan_completed(local_to_hw(local)); 536 return; 537 } 538 skip = 0; 539 chan = &sband->channels[local->scan_channel_idx]; 540 541 if (chan->flags & IEEE80211_CHAN_DISABLED || 542 (sdata->vif.type == NL80211_IFTYPE_ADHOC && 543 chan->flags & IEEE80211_CHAN_NO_IBSS)) 544 skip = 1; 545 546 if (!skip) { 547 local->scan_channel = chan; 548 if (ieee80211_hw_config(local, 549 IEEE80211_CONF_CHANGE_CHANNEL)) 550 skip = 1; 551 } 552 553 /* advance state machine to next channel/band */ 554 local->scan_channel_idx++; 555 if (local->scan_channel_idx >= sband->n_channels) { 556 /* 557 * scan_band may end up == IEEE80211_NUM_BANDS, but 558 * we'll catch that case above and complete the scan 559 * if that is the case. 560 */ 561 local->scan_band++; 562 local->scan_channel_idx = 0; 563 } 564 565 if (skip) 566 break; 567 568 next_delay = IEEE80211_PROBE_DELAY + 569 usecs_to_jiffies(local->hw.channel_change_time); 570 local->scan_state = SCAN_SEND_PROBE; 571 break; 572 case SCAN_SEND_PROBE: 573 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 574 local->scan_state = SCAN_SET_CHANNEL; 575 576 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) 577 break; 578 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, 579 local->scan_ssid_len); 580 next_delay = IEEE80211_CHANNEL_TIME; 581 break; 582 } 583 584 queue_delayed_work(local->hw.workqueue, &local->scan_work, 585 next_delay); 586 } 587 588 589 int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, 590 u8 *ssid, size_t ssid_len) 591 { 592 struct ieee80211_local *local = scan_sdata->local; 593 struct ieee80211_sub_if_data *sdata; 594 595 if (ssid_len > IEEE80211_MAX_SSID_LEN) 596 return -EINVAL; 597 598 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) 599 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS 600 * BSSID: MACAddress 601 * SSID 602 * ScanType: ACTIVE, PASSIVE 603 * ProbeDelay: delay (in microseconds) to be used prior to transmitting 604 * a Probe frame during active scanning 605 * ChannelList 606 * MinChannelTime (>= ProbeDelay), in TU 607 * MaxChannelTime: (>= MinChannelTime), in TU 608 */ 609 610 /* MLME-SCAN.confirm 611 * BSSDescriptionSet 612 * ResultCode: SUCCESS, INVALID_PARAMETERS 613 */ 614 615 if (local->sw_scanning || local->hw_scanning) { 616 if (local->scan_sdata == scan_sdata) 617 return 0; 618 return -EBUSY; 619 } 620 621 if (local->ops->hw_scan) { 622 int rc; 623 624 local->hw_scanning = true; 625 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len); 626 if (rc) { 627 local->hw_scanning = false; 628 return rc; 629 } 630 local->scan_sdata = scan_sdata; 631 return 0; 632 } 633 634 local->sw_scanning = true; 635 636 rcu_read_lock(); 637 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 638 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 639 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 640 netif_tx_stop_all_queues(sdata->dev); 641 ieee80211_send_nullfunc(local, sdata, 1); 642 } 643 } else 644 netif_tx_stop_all_queues(sdata->dev); 645 } 646 rcu_read_unlock(); 647 648 if (ssid) { 649 local->scan_ssid_len = ssid_len; 650 memcpy(local->scan_ssid, ssid, ssid_len); 651 } else 652 local->scan_ssid_len = 0; 653 local->scan_state = SCAN_SET_CHANNEL; 654 local->scan_channel_idx = 0; 655 local->scan_band = IEEE80211_BAND_2GHZ; 656 local->scan_sdata = scan_sdata; 657 658 netif_addr_lock_bh(local->mdev); 659 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; 660 local->ops->configure_filter(local_to_hw(local), 661 FIF_BCN_PRBRESP_PROMISC, 662 &local->filter_flags, 663 local->mdev->mc_count, 664 local->mdev->mc_list); 665 netif_addr_unlock_bh(local->mdev); 666 667 /* TODO: start scan as soon as all nullfunc frames are ACKed */ 668 queue_delayed_work(local->hw.workqueue, &local->scan_work, 669 IEEE80211_CHANNEL_TIME); 670 671 return 0; 672 } 673 674 675 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 676 u8 *ssid, size_t ssid_len) 677 { 678 struct ieee80211_local *local = sdata->local; 679 struct ieee80211_if_sta *ifsta; 680 681 if (sdata->vif.type != NL80211_IFTYPE_STATION) 682 return ieee80211_start_scan(sdata, ssid, ssid_len); 683 684 /* 685 * STA has a state machine that might need to defer scanning 686 * while it's trying to associate/authenticate, therefore we 687 * queue it up to the state machine in that case. 688 */ 689 690 if (local->sw_scanning || local->hw_scanning) { 691 if (local->scan_sdata == sdata) 692 return 0; 693 return -EBUSY; 694 } 695 696 ifsta = &sdata->u.sta; 697 698 ifsta->scan_ssid_len = ssid_len; 699 if (ssid_len) 700 memcpy(ifsta->scan_ssid, ssid, ssid_len); 701 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); 702 queue_work(local->hw.workqueue, &ifsta->work); 703 704 return 0; 705 } 706 707 708 static void ieee80211_scan_add_ies(struct iw_request_info *info, 709 struct ieee80211_bss *bss, 710 char **current_ev, char *end_buf) 711 { 712 u8 *pos, *end, *next; 713 struct iw_event iwe; 714 715 if (bss == NULL || bss->ies == NULL) 716 return; 717 718 /* 719 * If needed, fragment the IEs buffer (at IE boundaries) into short 720 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 721 */ 722 pos = bss->ies; 723 end = pos + bss->ies_len; 724 725 while (end - pos > IW_GENERIC_IE_MAX) { 726 next = pos + 2 + pos[1]; 727 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 728 next = next + 2 + next[1]; 729 730 memset(&iwe, 0, sizeof(iwe)); 731 iwe.cmd = IWEVGENIE; 732 iwe.u.data.length = next - pos; 733 *current_ev = iwe_stream_add_point(info, *current_ev, 734 end_buf, &iwe, pos); 735 736 pos = next; 737 } 738 739 if (end > pos) { 740 memset(&iwe, 0, sizeof(iwe)); 741 iwe.cmd = IWEVGENIE; 742 iwe.u.data.length = end - pos; 743 *current_ev = iwe_stream_add_point(info, *current_ev, 744 end_buf, &iwe, pos); 745 } 746 } 747 748 749 static char * 750 ieee80211_scan_result(struct ieee80211_local *local, 751 struct iw_request_info *info, 752 struct ieee80211_bss *bss, 753 char *current_ev, char *end_buf) 754 { 755 struct iw_event iwe; 756 char *buf; 757 758 if (time_after(jiffies, 759 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) 760 return current_ev; 761 762 memset(&iwe, 0, sizeof(iwe)); 763 iwe.cmd = SIOCGIWAP; 764 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 765 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN); 766 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 767 IW_EV_ADDR_LEN); 768 769 memset(&iwe, 0, sizeof(iwe)); 770 iwe.cmd = SIOCGIWESSID; 771 if (bss_mesh_cfg(bss)) { 772 iwe.u.data.length = bss_mesh_id_len(bss); 773 iwe.u.data.flags = 1; 774 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 775 &iwe, bss_mesh_id(bss)); 776 } else { 777 iwe.u.data.length = bss->ssid_len; 778 iwe.u.data.flags = 1; 779 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 780 &iwe, bss->ssid); 781 } 782 783 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 784 || bss_mesh_cfg(bss)) { 785 memset(&iwe, 0, sizeof(iwe)); 786 iwe.cmd = SIOCGIWMODE; 787 if (bss_mesh_cfg(bss)) 788 iwe.u.mode = IW_MODE_MESH; 789 else if (bss->capability & WLAN_CAPABILITY_ESS) 790 iwe.u.mode = IW_MODE_MASTER; 791 else 792 iwe.u.mode = IW_MODE_ADHOC; 793 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 794 &iwe, IW_EV_UINT_LEN); 795 } 796 797 memset(&iwe, 0, sizeof(iwe)); 798 iwe.cmd = SIOCGIWFREQ; 799 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq); 800 iwe.u.freq.e = 0; 801 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 802 IW_EV_FREQ_LEN); 803 804 memset(&iwe, 0, sizeof(iwe)); 805 iwe.cmd = SIOCGIWFREQ; 806 iwe.u.freq.m = bss->freq; 807 iwe.u.freq.e = 6; 808 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 809 IW_EV_FREQ_LEN); 810 memset(&iwe, 0, sizeof(iwe)); 811 iwe.cmd = IWEVQUAL; 812 iwe.u.qual.qual = bss->qual; 813 iwe.u.qual.level = bss->signal; 814 iwe.u.qual.noise = bss->noise; 815 iwe.u.qual.updated = local->wstats_flags; 816 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 817 IW_EV_QUAL_LEN); 818 819 memset(&iwe, 0, sizeof(iwe)); 820 iwe.cmd = SIOCGIWENCODE; 821 if (bss->capability & WLAN_CAPABILITY_PRIVACY) 822 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 823 else 824 iwe.u.data.flags = IW_ENCODE_DISABLED; 825 iwe.u.data.length = 0; 826 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 827 &iwe, ""); 828 829 ieee80211_scan_add_ies(info, bss, ¤t_ev, end_buf); 830 831 if (bss->supp_rates_len > 0) { 832 /* display all supported rates in readable format */ 833 char *p = current_ev + iwe_stream_lcp_len(info); 834 int i; 835 836 memset(&iwe, 0, sizeof(iwe)); 837 iwe.cmd = SIOCGIWRATE; 838 /* Those two flags are ignored... */ 839 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 840 841 for (i = 0; i < bss->supp_rates_len; i++) { 842 iwe.u.bitrate.value = ((bss->supp_rates[i] & 843 0x7f) * 500000); 844 p = iwe_stream_add_value(info, current_ev, p, 845 end_buf, &iwe, IW_EV_PARAM_LEN); 846 } 847 current_ev = p; 848 } 849 850 buf = kmalloc(30, GFP_ATOMIC); 851 if (buf) { 852 memset(&iwe, 0, sizeof(iwe)); 853 iwe.cmd = IWEVCUSTOM; 854 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); 855 iwe.u.data.length = strlen(buf); 856 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 857 &iwe, buf); 858 memset(&iwe, 0, sizeof(iwe)); 859 iwe.cmd = IWEVCUSTOM; 860 sprintf(buf, " Last beacon: %dms ago", 861 jiffies_to_msecs(jiffies - bss->last_update)); 862 iwe.u.data.length = strlen(buf); 863 current_ev = iwe_stream_add_point(info, current_ev, 864 end_buf, &iwe, buf); 865 kfree(buf); 866 } 867 868 if (bss_mesh_cfg(bss)) { 869 u8 *cfg = bss_mesh_cfg(bss); 870 buf = kmalloc(50, GFP_ATOMIC); 871 if (buf) { 872 memset(&iwe, 0, sizeof(iwe)); 873 iwe.cmd = IWEVCUSTOM; 874 sprintf(buf, "Mesh network (version %d)", cfg[0]); 875 iwe.u.data.length = strlen(buf); 876 current_ev = iwe_stream_add_point(info, current_ev, 877 end_buf, 878 &iwe, buf); 879 sprintf(buf, "Path Selection Protocol ID: " 880 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 881 cfg[4]); 882 iwe.u.data.length = strlen(buf); 883 current_ev = iwe_stream_add_point(info, current_ev, 884 end_buf, 885 &iwe, buf); 886 sprintf(buf, "Path Selection Metric ID: " 887 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 888 cfg[8]); 889 iwe.u.data.length = strlen(buf); 890 current_ev = iwe_stream_add_point(info, current_ev, 891 end_buf, 892 &iwe, buf); 893 sprintf(buf, "Congestion Control Mode ID: " 894 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 895 cfg[11], cfg[12]); 896 iwe.u.data.length = strlen(buf); 897 current_ev = iwe_stream_add_point(info, current_ev, 898 end_buf, 899 &iwe, buf); 900 sprintf(buf, "Channel Precedence: " 901 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 902 cfg[15], cfg[16]); 903 iwe.u.data.length = strlen(buf); 904 current_ev = iwe_stream_add_point(info, current_ev, 905 end_buf, 906 &iwe, buf); 907 kfree(buf); 908 } 909 } 910 911 return current_ev; 912 } 913 914 915 int ieee80211_scan_results(struct ieee80211_local *local, 916 struct iw_request_info *info, 917 char *buf, size_t len) 918 { 919 char *current_ev = buf; 920 char *end_buf = buf + len; 921 struct ieee80211_bss *bss; 922 923 spin_lock_bh(&local->bss_lock); 924 list_for_each_entry(bss, &local->bss_list, list) { 925 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 926 spin_unlock_bh(&local->bss_lock); 927 return -E2BIG; 928 } 929 current_ev = ieee80211_scan_result(local, info, bss, 930 current_ev, end_buf); 931 } 932 spin_unlock_bh(&local->bss_lock); 933 return current_ev - buf; 934 } 935