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 != MESH_CFG_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 if (ieee80211_hw_config(local)) 452 printk(KERN_DEBUG "%s: failed to restore operational " 453 "channel after scan\n", wiphy_name(local->hw.wiphy)); 454 455 goto done; 456 } 457 458 local->sw_scanning = false; 459 if (ieee80211_hw_config(local)) 460 printk(KERN_DEBUG "%s: failed to restore operational " 461 "channel after scan\n", wiphy_name(local->hw.wiphy)); 462 463 464 netif_tx_lock_bh(local->mdev); 465 netif_addr_lock(local->mdev); 466 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; 467 local->ops->configure_filter(local_to_hw(local), 468 FIF_BCN_PRBRESP_PROMISC, 469 &local->filter_flags, 470 local->mdev->mc_count, 471 local->mdev->mc_list); 472 473 netif_addr_unlock(local->mdev); 474 netif_tx_unlock_bh(local->mdev); 475 476 rcu_read_lock(); 477 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 478 /* Tell AP we're back */ 479 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 480 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 481 ieee80211_send_nullfunc(local, sdata, 0); 482 netif_tx_wake_all_queues(sdata->dev); 483 } 484 } else 485 netif_tx_wake_all_queues(sdata->dev); 486 } 487 rcu_read_unlock(); 488 489 done: 490 ieee80211_mlme_notify_scan_completed(local); 491 ieee80211_mesh_notify_scan_completed(local); 492 } 493 EXPORT_SYMBOL(ieee80211_scan_completed); 494 495 496 void ieee80211_scan_work(struct work_struct *work) 497 { 498 struct ieee80211_local *local = 499 container_of(work, struct ieee80211_local, scan_work.work); 500 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 501 struct ieee80211_supported_band *sband; 502 struct ieee80211_channel *chan; 503 int skip; 504 unsigned long next_delay = 0; 505 506 /* 507 * Avoid re-scheduling when the sdata is going away. 508 */ 509 if (!netif_running(sdata->dev)) 510 return; 511 512 switch (local->scan_state) { 513 case SCAN_SET_CHANNEL: 514 /* 515 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS 516 * after we successfully scanned the last channel of the last 517 * band (and the last band is supported by the hw) 518 */ 519 if (local->scan_band < IEEE80211_NUM_BANDS) 520 sband = local->hw.wiphy->bands[local->scan_band]; 521 else 522 sband = NULL; 523 524 /* 525 * If we are at an unsupported band and have more bands 526 * left to scan, advance to the next supported one. 527 */ 528 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) { 529 local->scan_band++; 530 sband = local->hw.wiphy->bands[local->scan_band]; 531 local->scan_channel_idx = 0; 532 } 533 534 /* if no more bands/channels left, complete scan */ 535 if (!sband || local->scan_channel_idx >= sband->n_channels) { 536 ieee80211_scan_completed(local_to_hw(local)); 537 return; 538 } 539 skip = 0; 540 chan = &sband->channels[local->scan_channel_idx]; 541 542 if (chan->flags & IEEE80211_CHAN_DISABLED || 543 (sdata->vif.type == NL80211_IFTYPE_ADHOC && 544 chan->flags & IEEE80211_CHAN_NO_IBSS)) 545 skip = 1; 546 547 if (!skip) { 548 local->scan_channel = chan; 549 if (ieee80211_hw_config(local)) { 550 printk(KERN_DEBUG "%s: failed to set freq to " 551 "%d MHz for scan\n", wiphy_name(local->hw.wiphy), 552 chan->center_freq); 553 skip = 1; 554 } 555 } 556 557 /* advance state machine to next channel/band */ 558 local->scan_channel_idx++; 559 if (local->scan_channel_idx >= sband->n_channels) { 560 /* 561 * scan_band may end up == IEEE80211_NUM_BANDS, but 562 * we'll catch that case above and complete the scan 563 * if that is the case. 564 */ 565 local->scan_band++; 566 local->scan_channel_idx = 0; 567 } 568 569 if (skip) 570 break; 571 572 next_delay = IEEE80211_PROBE_DELAY + 573 usecs_to_jiffies(local->hw.channel_change_time); 574 local->scan_state = SCAN_SEND_PROBE; 575 break; 576 case SCAN_SEND_PROBE: 577 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 578 local->scan_state = SCAN_SET_CHANNEL; 579 580 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN) 581 break; 582 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid, 583 local->scan_ssid_len); 584 next_delay = IEEE80211_CHANNEL_TIME; 585 break; 586 } 587 588 queue_delayed_work(local->hw.workqueue, &local->scan_work, 589 next_delay); 590 } 591 592 593 int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, 594 u8 *ssid, size_t ssid_len) 595 { 596 struct ieee80211_local *local = scan_sdata->local; 597 struct ieee80211_sub_if_data *sdata; 598 599 if (ssid_len > IEEE80211_MAX_SSID_LEN) 600 return -EINVAL; 601 602 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) 603 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS 604 * BSSID: MACAddress 605 * SSID 606 * ScanType: ACTIVE, PASSIVE 607 * ProbeDelay: delay (in microseconds) to be used prior to transmitting 608 * a Probe frame during active scanning 609 * ChannelList 610 * MinChannelTime (>= ProbeDelay), in TU 611 * MaxChannelTime: (>= MinChannelTime), in TU 612 */ 613 614 /* MLME-SCAN.confirm 615 * BSSDescriptionSet 616 * ResultCode: SUCCESS, INVALID_PARAMETERS 617 */ 618 619 if (local->sw_scanning || local->hw_scanning) { 620 if (local->scan_sdata == scan_sdata) 621 return 0; 622 return -EBUSY; 623 } 624 625 if (local->ops->hw_scan) { 626 int rc; 627 628 local->hw_scanning = true; 629 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len); 630 if (rc) { 631 local->hw_scanning = false; 632 return rc; 633 } 634 local->scan_sdata = scan_sdata; 635 return 0; 636 } 637 638 local->sw_scanning = true; 639 640 rcu_read_lock(); 641 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 642 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 643 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { 644 netif_tx_stop_all_queues(sdata->dev); 645 ieee80211_send_nullfunc(local, sdata, 1); 646 } 647 } else 648 netif_tx_stop_all_queues(sdata->dev); 649 } 650 rcu_read_unlock(); 651 652 if (ssid) { 653 local->scan_ssid_len = ssid_len; 654 memcpy(local->scan_ssid, ssid, ssid_len); 655 } else 656 local->scan_ssid_len = 0; 657 local->scan_state = SCAN_SET_CHANNEL; 658 local->scan_channel_idx = 0; 659 local->scan_band = IEEE80211_BAND_2GHZ; 660 local->scan_sdata = scan_sdata; 661 662 netif_addr_lock_bh(local->mdev); 663 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; 664 local->ops->configure_filter(local_to_hw(local), 665 FIF_BCN_PRBRESP_PROMISC, 666 &local->filter_flags, 667 local->mdev->mc_count, 668 local->mdev->mc_list); 669 netif_addr_unlock_bh(local->mdev); 670 671 /* TODO: start scan as soon as all nullfunc frames are ACKed */ 672 queue_delayed_work(local->hw.workqueue, &local->scan_work, 673 IEEE80211_CHANNEL_TIME); 674 675 return 0; 676 } 677 678 679 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 680 u8 *ssid, size_t ssid_len) 681 { 682 struct ieee80211_local *local = sdata->local; 683 struct ieee80211_if_sta *ifsta; 684 685 if (sdata->vif.type != NL80211_IFTYPE_STATION) 686 return ieee80211_start_scan(sdata, ssid, ssid_len); 687 688 /* 689 * STA has a state machine that might need to defer scanning 690 * while it's trying to associate/authenticate, therefore we 691 * queue it up to the state machine in that case. 692 */ 693 694 if (local->sw_scanning || local->hw_scanning) { 695 if (local->scan_sdata == sdata) 696 return 0; 697 return -EBUSY; 698 } 699 700 ifsta = &sdata->u.sta; 701 702 ifsta->scan_ssid_len = ssid_len; 703 if (ssid_len) 704 memcpy(ifsta->scan_ssid, ssid, ssid_len); 705 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); 706 queue_work(local->hw.workqueue, &ifsta->work); 707 708 return 0; 709 } 710 711 712 static void ieee80211_scan_add_ies(struct iw_request_info *info, 713 struct ieee80211_bss *bss, 714 char **current_ev, char *end_buf) 715 { 716 u8 *pos, *end, *next; 717 struct iw_event iwe; 718 719 if (bss == NULL || bss->ies == NULL) 720 return; 721 722 /* 723 * If needed, fragment the IEs buffer (at IE boundaries) into short 724 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 725 */ 726 pos = bss->ies; 727 end = pos + bss->ies_len; 728 729 while (end - pos > IW_GENERIC_IE_MAX) { 730 next = pos + 2 + pos[1]; 731 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 732 next = next + 2 + next[1]; 733 734 memset(&iwe, 0, sizeof(iwe)); 735 iwe.cmd = IWEVGENIE; 736 iwe.u.data.length = next - pos; 737 *current_ev = iwe_stream_add_point(info, *current_ev, 738 end_buf, &iwe, pos); 739 740 pos = next; 741 } 742 743 if (end > pos) { 744 memset(&iwe, 0, sizeof(iwe)); 745 iwe.cmd = IWEVGENIE; 746 iwe.u.data.length = end - pos; 747 *current_ev = iwe_stream_add_point(info, *current_ev, 748 end_buf, &iwe, pos); 749 } 750 } 751 752 753 static char * 754 ieee80211_scan_result(struct ieee80211_local *local, 755 struct iw_request_info *info, 756 struct ieee80211_bss *bss, 757 char *current_ev, char *end_buf) 758 { 759 struct iw_event iwe; 760 char *buf; 761 762 if (time_after(jiffies, 763 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE)) 764 return current_ev; 765 766 memset(&iwe, 0, sizeof(iwe)); 767 iwe.cmd = SIOCGIWAP; 768 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 769 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN); 770 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 771 IW_EV_ADDR_LEN); 772 773 memset(&iwe, 0, sizeof(iwe)); 774 iwe.cmd = SIOCGIWESSID; 775 if (bss_mesh_cfg(bss)) { 776 iwe.u.data.length = bss_mesh_id_len(bss); 777 iwe.u.data.flags = 1; 778 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 779 &iwe, bss_mesh_id(bss)); 780 } else { 781 iwe.u.data.length = bss->ssid_len; 782 iwe.u.data.flags = 1; 783 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 784 &iwe, bss->ssid); 785 } 786 787 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 788 || bss_mesh_cfg(bss)) { 789 memset(&iwe, 0, sizeof(iwe)); 790 iwe.cmd = SIOCGIWMODE; 791 if (bss_mesh_cfg(bss)) 792 iwe.u.mode = IW_MODE_MESH; 793 else if (bss->capability & WLAN_CAPABILITY_ESS) 794 iwe.u.mode = IW_MODE_MASTER; 795 else 796 iwe.u.mode = IW_MODE_ADHOC; 797 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 798 &iwe, IW_EV_UINT_LEN); 799 } 800 801 memset(&iwe, 0, sizeof(iwe)); 802 iwe.cmd = SIOCGIWFREQ; 803 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq); 804 iwe.u.freq.e = 0; 805 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 806 IW_EV_FREQ_LEN); 807 808 memset(&iwe, 0, sizeof(iwe)); 809 iwe.cmd = SIOCGIWFREQ; 810 iwe.u.freq.m = bss->freq; 811 iwe.u.freq.e = 6; 812 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 813 IW_EV_FREQ_LEN); 814 memset(&iwe, 0, sizeof(iwe)); 815 iwe.cmd = IWEVQUAL; 816 iwe.u.qual.qual = bss->qual; 817 iwe.u.qual.level = bss->signal; 818 iwe.u.qual.noise = bss->noise; 819 iwe.u.qual.updated = local->wstats_flags; 820 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 821 IW_EV_QUAL_LEN); 822 823 memset(&iwe, 0, sizeof(iwe)); 824 iwe.cmd = SIOCGIWENCODE; 825 if (bss->capability & WLAN_CAPABILITY_PRIVACY) 826 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 827 else 828 iwe.u.data.flags = IW_ENCODE_DISABLED; 829 iwe.u.data.length = 0; 830 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 831 &iwe, ""); 832 833 ieee80211_scan_add_ies(info, bss, ¤t_ev, end_buf); 834 835 if (bss->supp_rates_len > 0) { 836 /* display all supported rates in readable format */ 837 char *p = current_ev + iwe_stream_lcp_len(info); 838 int i; 839 840 memset(&iwe, 0, sizeof(iwe)); 841 iwe.cmd = SIOCGIWRATE; 842 /* Those two flags are ignored... */ 843 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 844 845 for (i = 0; i < bss->supp_rates_len; i++) { 846 iwe.u.bitrate.value = ((bss->supp_rates[i] & 847 0x7f) * 500000); 848 p = iwe_stream_add_value(info, current_ev, p, 849 end_buf, &iwe, IW_EV_PARAM_LEN); 850 } 851 current_ev = p; 852 } 853 854 buf = kmalloc(30, GFP_ATOMIC); 855 if (buf) { 856 memset(&iwe, 0, sizeof(iwe)); 857 iwe.cmd = IWEVCUSTOM; 858 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp)); 859 iwe.u.data.length = strlen(buf); 860 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 861 &iwe, buf); 862 memset(&iwe, 0, sizeof(iwe)); 863 iwe.cmd = IWEVCUSTOM; 864 sprintf(buf, " Last beacon: %dms ago", 865 jiffies_to_msecs(jiffies - bss->last_update)); 866 iwe.u.data.length = strlen(buf); 867 current_ev = iwe_stream_add_point(info, current_ev, 868 end_buf, &iwe, buf); 869 kfree(buf); 870 } 871 872 if (bss_mesh_cfg(bss)) { 873 u8 *cfg = bss_mesh_cfg(bss); 874 buf = kmalloc(50, GFP_ATOMIC); 875 if (buf) { 876 memset(&iwe, 0, sizeof(iwe)); 877 iwe.cmd = IWEVCUSTOM; 878 sprintf(buf, "Mesh network (version %d)", cfg[0]); 879 iwe.u.data.length = strlen(buf); 880 current_ev = iwe_stream_add_point(info, current_ev, 881 end_buf, 882 &iwe, buf); 883 sprintf(buf, "Path Selection Protocol ID: " 884 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 885 cfg[4]); 886 iwe.u.data.length = strlen(buf); 887 current_ev = iwe_stream_add_point(info, current_ev, 888 end_buf, 889 &iwe, buf); 890 sprintf(buf, "Path Selection Metric ID: " 891 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 892 cfg[8]); 893 iwe.u.data.length = strlen(buf); 894 current_ev = iwe_stream_add_point(info, current_ev, 895 end_buf, 896 &iwe, buf); 897 sprintf(buf, "Congestion Control Mode ID: " 898 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 899 cfg[11], cfg[12]); 900 iwe.u.data.length = strlen(buf); 901 current_ev = iwe_stream_add_point(info, current_ev, 902 end_buf, 903 &iwe, buf); 904 sprintf(buf, "Channel Precedence: " 905 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 906 cfg[15], cfg[16]); 907 iwe.u.data.length = strlen(buf); 908 current_ev = iwe_stream_add_point(info, current_ev, 909 end_buf, 910 &iwe, buf); 911 kfree(buf); 912 } 913 } 914 915 return current_ev; 916 } 917 918 919 int ieee80211_scan_results(struct ieee80211_local *local, 920 struct iw_request_info *info, 921 char *buf, size_t len) 922 { 923 char *current_ev = buf; 924 char *end_buf = buf + len; 925 struct ieee80211_bss *bss; 926 927 spin_lock_bh(&local->bss_lock); 928 list_for_each_entry(bss, &local->bss_list, list) { 929 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 930 spin_unlock_bh(&local->bss_lock); 931 return -E2BIG; 932 } 933 current_ev = ieee80211_scan_result(local, info, bss, 934 current_ev, end_buf); 935 } 936 spin_unlock_bh(&local->bss_lock); 937 return current_ev - buf; 938 } 939