scan.c revision e60d7443e00a72a2c056950cdaab79c7b077f3d4
1/* 2 * cfg80211 scan result handling 3 * 4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> 5 */ 6#include <linux/kernel.h> 7#include <linux/module.h> 8#include <linux/netdevice.h> 9#include <linux/wireless.h> 10#include <linux/nl80211.h> 11#include <linux/etherdevice.h> 12#include <net/arp.h> 13#include <net/cfg80211.h> 14#include <net/iw_handler.h> 15#include "core.h" 16#include "nl80211.h" 17#include "wext-compat.h" 18 19#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) 20 21void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) 22{ 23 struct cfg80211_scan_request *request; 24 struct net_device *dev; 25#ifdef CONFIG_CFG80211_WEXT 26 union iwreq_data wrqu; 27#endif 28 29 ASSERT_RDEV_LOCK(rdev); 30 31 request = rdev->scan_req; 32 33 if (!request) 34 return; 35 36 dev = request->dev; 37 38 /* 39 * This must be before sending the other events! 40 * Otherwise, wpa_supplicant gets completely confused with 41 * wext events. 42 */ 43 cfg80211_sme_scan_done(dev); 44 45 if (request->aborted) 46 nl80211_send_scan_aborted(rdev, dev); 47 else 48 nl80211_send_scan_done(rdev, dev); 49 50#ifdef CONFIG_CFG80211_WEXT 51 if (!request->aborted) { 52 memset(&wrqu, 0, sizeof(wrqu)); 53 54 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 55 } 56#endif 57 58 dev_put(dev); 59 60 rdev->scan_req = NULL; 61 62 /* 63 * OK. If this is invoked with "leak" then we can't 64 * free this ... but we've cleaned it up anyway. The 65 * driver failed to call the scan_done callback, so 66 * all bets are off, it might still be trying to use 67 * the scan request or not ... if it accesses the dev 68 * in there (it shouldn't anyway) then it may crash. 69 */ 70 if (!leak) 71 kfree(request); 72} 73 74void __cfg80211_scan_done(struct work_struct *wk) 75{ 76 struct cfg80211_registered_device *rdev; 77 78 rdev = container_of(wk, struct cfg80211_registered_device, 79 scan_done_wk); 80 81 cfg80211_lock_rdev(rdev); 82 ___cfg80211_scan_done(rdev, false); 83 cfg80211_unlock_rdev(rdev); 84} 85 86void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 87{ 88 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 89 90 request->aborted = aborted; 91 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); 92} 93EXPORT_SYMBOL(cfg80211_scan_done); 94 95static void bss_release(struct kref *ref) 96{ 97 struct cfg80211_internal_bss *bss; 98 99 bss = container_of(ref, struct cfg80211_internal_bss, ref); 100 if (bss->pub.free_priv) 101 bss->pub.free_priv(&bss->pub); 102 103 if (bss->ies_allocated) 104 kfree(bss->pub.information_elements); 105 106 BUG_ON(atomic_read(&bss->hold)); 107 108 kfree(bss); 109} 110 111/* must hold dev->bss_lock! */ 112void cfg80211_bss_age(struct cfg80211_registered_device *dev, 113 unsigned long age_secs) 114{ 115 struct cfg80211_internal_bss *bss; 116 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 117 118 list_for_each_entry(bss, &dev->bss_list, list) { 119 bss->ts -= age_jiffies; 120 } 121} 122 123/* must hold dev->bss_lock! */ 124void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 125{ 126 struct cfg80211_internal_bss *bss, *tmp; 127 bool expired = false; 128 129 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 130 if (atomic_read(&bss->hold)) 131 continue; 132 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 133 continue; 134 list_del(&bss->list); 135 rb_erase(&bss->rbn, &dev->bss_tree); 136 kref_put(&bss->ref, bss_release); 137 expired = true; 138 } 139 140 if (expired) 141 dev->bss_generation++; 142} 143 144static u8 *find_ie(u8 num, u8 *ies, int len) 145{ 146 while (len > 2 && ies[0] != num) { 147 len -= ies[1] + 2; 148 ies += ies[1] + 2; 149 } 150 if (len < 2) 151 return NULL; 152 if (len < 2 + ies[1]) 153 return NULL; 154 return ies; 155} 156 157static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 158{ 159 const u8 *ie1 = find_ie(num, ies1, len1); 160 const u8 *ie2 = find_ie(num, ies2, len2); 161 int r; 162 163 if (!ie1 && !ie2) 164 return 0; 165 if (!ie1 || !ie2) 166 return -1; 167 168 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 169 if (r == 0 && ie1[1] != ie2[1]) 170 return ie2[1] - ie1[1]; 171 return r; 172} 173 174static bool is_bss(struct cfg80211_bss *a, 175 const u8 *bssid, 176 const u8 *ssid, size_t ssid_len) 177{ 178 const u8 *ssidie; 179 180 if (bssid && compare_ether_addr(a->bssid, bssid)) 181 return false; 182 183 if (!ssid) 184 return true; 185 186 ssidie = find_ie(WLAN_EID_SSID, 187 a->information_elements, 188 a->len_information_elements); 189 if (!ssidie) 190 return false; 191 if (ssidie[1] != ssid_len) 192 return false; 193 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 194} 195 196static bool is_mesh(struct cfg80211_bss *a, 197 const u8 *meshid, size_t meshidlen, 198 const u8 *meshcfg) 199{ 200 const u8 *ie; 201 202 if (!is_zero_ether_addr(a->bssid)) 203 return false; 204 205 ie = find_ie(WLAN_EID_MESH_ID, 206 a->information_elements, 207 a->len_information_elements); 208 if (!ie) 209 return false; 210 if (ie[1] != meshidlen) 211 return false; 212 if (memcmp(ie + 2, meshid, meshidlen)) 213 return false; 214 215 ie = find_ie(WLAN_EID_MESH_CONFIG, 216 a->information_elements, 217 a->len_information_elements); 218 if (!ie) 219 return false; 220 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 221 return false; 222 223 /* 224 * Ignore mesh capability (last two bytes of the IE) when 225 * comparing since that may differ between stations taking 226 * part in the same mesh. 227 */ 228 return memcmp(ie + 2, meshcfg, 229 sizeof(struct ieee80211_meshconf_ie) - 2) == 0; 230} 231 232static int cmp_bss(struct cfg80211_bss *a, 233 struct cfg80211_bss *b) 234{ 235 int r; 236 237 if (a->channel != b->channel) 238 return b->channel->center_freq - a->channel->center_freq; 239 240 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 241 if (r) 242 return r; 243 244 if (is_zero_ether_addr(a->bssid)) { 245 r = cmp_ies(WLAN_EID_MESH_ID, 246 a->information_elements, 247 a->len_information_elements, 248 b->information_elements, 249 b->len_information_elements); 250 if (r) 251 return r; 252 return cmp_ies(WLAN_EID_MESH_CONFIG, 253 a->information_elements, 254 a->len_information_elements, 255 b->information_elements, 256 b->len_information_elements); 257 } 258 259 return cmp_ies(WLAN_EID_SSID, 260 a->information_elements, 261 a->len_information_elements, 262 b->information_elements, 263 b->len_information_elements); 264} 265 266struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 267 struct ieee80211_channel *channel, 268 const u8 *bssid, 269 const u8 *ssid, size_t ssid_len, 270 u16 capa_mask, u16 capa_val) 271{ 272 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 273 struct cfg80211_internal_bss *bss, *res = NULL; 274 275 spin_lock_bh(&dev->bss_lock); 276 277 list_for_each_entry(bss, &dev->bss_list, list) { 278 if ((bss->pub.capability & capa_mask) != capa_val) 279 continue; 280 if (channel && bss->pub.channel != channel) 281 continue; 282 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 283 res = bss; 284 kref_get(&res->ref); 285 break; 286 } 287 } 288 289 spin_unlock_bh(&dev->bss_lock); 290 if (!res) 291 return NULL; 292 return &res->pub; 293} 294EXPORT_SYMBOL(cfg80211_get_bss); 295 296struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 297 struct ieee80211_channel *channel, 298 const u8 *meshid, size_t meshidlen, 299 const u8 *meshcfg) 300{ 301 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 302 struct cfg80211_internal_bss *bss, *res = NULL; 303 304 spin_lock_bh(&dev->bss_lock); 305 306 list_for_each_entry(bss, &dev->bss_list, list) { 307 if (channel && bss->pub.channel != channel) 308 continue; 309 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 310 res = bss; 311 kref_get(&res->ref); 312 break; 313 } 314 } 315 316 spin_unlock_bh(&dev->bss_lock); 317 if (!res) 318 return NULL; 319 return &res->pub; 320} 321EXPORT_SYMBOL(cfg80211_get_mesh); 322 323 324static void rb_insert_bss(struct cfg80211_registered_device *dev, 325 struct cfg80211_internal_bss *bss) 326{ 327 struct rb_node **p = &dev->bss_tree.rb_node; 328 struct rb_node *parent = NULL; 329 struct cfg80211_internal_bss *tbss; 330 int cmp; 331 332 while (*p) { 333 parent = *p; 334 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 335 336 cmp = cmp_bss(&bss->pub, &tbss->pub); 337 338 if (WARN_ON(!cmp)) { 339 /* will sort of leak this BSS */ 340 return; 341 } 342 343 if (cmp < 0) 344 p = &(*p)->rb_left; 345 else 346 p = &(*p)->rb_right; 347 } 348 349 rb_link_node(&bss->rbn, parent, p); 350 rb_insert_color(&bss->rbn, &dev->bss_tree); 351} 352 353static struct cfg80211_internal_bss * 354rb_find_bss(struct cfg80211_registered_device *dev, 355 struct cfg80211_internal_bss *res) 356{ 357 struct rb_node *n = dev->bss_tree.rb_node; 358 struct cfg80211_internal_bss *bss; 359 int r; 360 361 while (n) { 362 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 363 r = cmp_bss(&res->pub, &bss->pub); 364 365 if (r == 0) 366 return bss; 367 else if (r < 0) 368 n = n->rb_left; 369 else 370 n = n->rb_right; 371 } 372 373 return NULL; 374} 375 376static struct cfg80211_internal_bss * 377cfg80211_bss_update(struct cfg80211_registered_device *dev, 378 struct cfg80211_internal_bss *res, 379 bool overwrite) 380{ 381 struct cfg80211_internal_bss *found = NULL; 382 const u8 *meshid, *meshcfg; 383 384 /* 385 * The reference to "res" is donated to this function. 386 */ 387 388 if (WARN_ON(!res->pub.channel)) { 389 kref_put(&res->ref, bss_release); 390 return NULL; 391 } 392 393 res->ts = jiffies; 394 395 if (is_zero_ether_addr(res->pub.bssid)) { 396 /* must be mesh, verify */ 397 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 398 res->pub.len_information_elements); 399 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 400 res->pub.information_elements, 401 res->pub.len_information_elements); 402 if (!meshid || !meshcfg || 403 meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { 404 /* bogus mesh */ 405 kref_put(&res->ref, bss_release); 406 return NULL; 407 } 408 } 409 410 spin_lock_bh(&dev->bss_lock); 411 412 found = rb_find_bss(dev, res); 413 414 if (found) { 415 found->pub.beacon_interval = res->pub.beacon_interval; 416 found->pub.tsf = res->pub.tsf; 417 found->pub.signal = res->pub.signal; 418 found->pub.capability = res->pub.capability; 419 found->ts = res->ts; 420 421 /* overwrite IEs */ 422 if (overwrite) { 423 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 424 size_t ielen = res->pub.len_information_elements; 425 426 if (!found->ies_allocated && ksize(found) >= used + ielen) { 427 memcpy(found->pub.information_elements, 428 res->pub.information_elements, ielen); 429 found->pub.len_information_elements = ielen; 430 } else { 431 u8 *ies = found->pub.information_elements; 432 433 if (found->ies_allocated) 434 ies = krealloc(ies, ielen, GFP_ATOMIC); 435 else 436 ies = kmalloc(ielen, GFP_ATOMIC); 437 438 if (ies) { 439 memcpy(ies, res->pub.information_elements, ielen); 440 found->ies_allocated = true; 441 found->pub.information_elements = ies; 442 found->pub.len_information_elements = ielen; 443 } 444 } 445 } 446 447 kref_put(&res->ref, bss_release); 448 } else { 449 /* this "consumes" the reference */ 450 list_add_tail(&res->list, &dev->bss_list); 451 rb_insert_bss(dev, res); 452 found = res; 453 } 454 455 dev->bss_generation++; 456 spin_unlock_bh(&dev->bss_lock); 457 458 kref_get(&found->ref); 459 return found; 460} 461 462struct cfg80211_bss* 463cfg80211_inform_bss(struct wiphy *wiphy, 464 struct ieee80211_channel *channel, 465 const u8 *bssid, 466 u64 timestamp, u16 capability, u16 beacon_interval, 467 const u8 *ie, size_t ielen, 468 s32 signal, gfp_t gfp) 469{ 470 struct cfg80211_internal_bss *res; 471 size_t privsz; 472 473 if (WARN_ON(!wiphy)) 474 return NULL; 475 476 privsz = wiphy->bss_priv_size; 477 478 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 479 (signal < 0 || signal > 100))) 480 return NULL; 481 482 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 483 if (!res) 484 return NULL; 485 486 memcpy(res->pub.bssid, bssid, ETH_ALEN); 487 res->pub.channel = channel; 488 res->pub.signal = signal; 489 res->pub.tsf = timestamp; 490 res->pub.beacon_interval = beacon_interval; 491 res->pub.capability = capability; 492 /* point to after the private area */ 493 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 494 memcpy(res->pub.information_elements, ie, ielen); 495 res->pub.len_information_elements = ielen; 496 497 kref_init(&res->ref); 498 499 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); 500 if (!res) 501 return NULL; 502 503 if (res->pub.capability & WLAN_CAPABILITY_ESS) 504 regulatory_hint_found_beacon(wiphy, channel, gfp); 505 506 /* cfg80211_bss_update gives us a referenced result */ 507 return &res->pub; 508} 509EXPORT_SYMBOL(cfg80211_inform_bss); 510 511struct cfg80211_bss * 512cfg80211_inform_bss_frame(struct wiphy *wiphy, 513 struct ieee80211_channel *channel, 514 struct ieee80211_mgmt *mgmt, size_t len, 515 s32 signal, gfp_t gfp) 516{ 517 struct cfg80211_internal_bss *res; 518 size_t ielen = len - offsetof(struct ieee80211_mgmt, 519 u.probe_resp.variable); 520 bool overwrite; 521 size_t privsz = wiphy->bss_priv_size; 522 523 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 524 (signal < 0 || signal > 100))) 525 return NULL; 526 527 if (WARN_ON(!mgmt || !wiphy || 528 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 529 return NULL; 530 531 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 532 if (!res) 533 return NULL; 534 535 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 536 res->pub.channel = channel; 537 res->pub.signal = signal; 538 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 539 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 540 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 541 /* point to after the private area */ 542 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 543 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 544 res->pub.len_information_elements = ielen; 545 546 kref_init(&res->ref); 547 548 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 549 550 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 551 if (!res) 552 return NULL; 553 554 if (res->pub.capability & WLAN_CAPABILITY_ESS) 555 regulatory_hint_found_beacon(wiphy, channel, gfp); 556 557 /* cfg80211_bss_update gives us a referenced result */ 558 return &res->pub; 559} 560EXPORT_SYMBOL(cfg80211_inform_bss_frame); 561 562void cfg80211_put_bss(struct cfg80211_bss *pub) 563{ 564 struct cfg80211_internal_bss *bss; 565 566 if (!pub) 567 return; 568 569 bss = container_of(pub, struct cfg80211_internal_bss, pub); 570 kref_put(&bss->ref, bss_release); 571} 572EXPORT_SYMBOL(cfg80211_put_bss); 573 574void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 575{ 576 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 577 struct cfg80211_internal_bss *bss; 578 579 if (WARN_ON(!pub)) 580 return; 581 582 bss = container_of(pub, struct cfg80211_internal_bss, pub); 583 584 spin_lock_bh(&dev->bss_lock); 585 586 list_del(&bss->list); 587 dev->bss_generation++; 588 rb_erase(&bss->rbn, &dev->bss_tree); 589 590 spin_unlock_bh(&dev->bss_lock); 591 592 kref_put(&bss->ref, bss_release); 593} 594EXPORT_SYMBOL(cfg80211_unlink_bss); 595 596#ifdef CONFIG_CFG80211_WEXT 597int cfg80211_wext_siwscan(struct net_device *dev, 598 struct iw_request_info *info, 599 union iwreq_data *wrqu, char *extra) 600{ 601 struct cfg80211_registered_device *rdev; 602 struct wiphy *wiphy; 603 struct iw_scan_req *wreq = NULL; 604 struct cfg80211_scan_request *creq; 605 int i, err, n_channels = 0; 606 enum ieee80211_band band; 607 608 if (!netif_running(dev)) 609 return -ENETDOWN; 610 611 if (wrqu->data.length == sizeof(struct iw_scan_req)) 612 wreq = (struct iw_scan_req *)extra; 613 614 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 615 616 if (IS_ERR(rdev)) 617 return PTR_ERR(rdev); 618 619 if (rdev->scan_req) { 620 err = -EBUSY; 621 goto out; 622 } 623 624 wiphy = &rdev->wiphy; 625 626 /* Determine number of channels, needed to allocate creq */ 627 if (wreq && wreq->num_channels) 628 n_channels = wreq->num_channels; 629 else { 630 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 631 if (wiphy->bands[band]) 632 n_channels += wiphy->bands[band]->n_channels; 633 } 634 635 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 636 n_channels * sizeof(void *), 637 GFP_ATOMIC); 638 if (!creq) { 639 err = -ENOMEM; 640 goto out; 641 } 642 643 creq->wiphy = wiphy; 644 creq->dev = dev; 645 /* SSIDs come after channels */ 646 creq->ssids = (void *)&creq->channels[n_channels]; 647 creq->n_channels = n_channels; 648 creq->n_ssids = 1; 649 650 /* translate "Scan on frequencies" request */ 651 i = 0; 652 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 653 int j; 654 655 if (!wiphy->bands[band]) 656 continue; 657 658 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 659 /* ignore disabled channels */ 660 if (wiphy->bands[band]->channels[j].flags & 661 IEEE80211_CHAN_DISABLED) 662 continue; 663 664 /* If we have a wireless request structure and the 665 * wireless request specifies frequencies, then search 666 * for the matching hardware channel. 667 */ 668 if (wreq && wreq->num_channels) { 669 int k; 670 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 671 for (k = 0; k < wreq->num_channels; k++) { 672 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 673 if (wext_freq == wiphy_freq) 674 goto wext_freq_found; 675 } 676 goto wext_freq_not_found; 677 } 678 679 wext_freq_found: 680 creq->channels[i] = &wiphy->bands[band]->channels[j]; 681 i++; 682 wext_freq_not_found: ; 683 } 684 } 685 /* No channels found? */ 686 if (!i) { 687 err = -EINVAL; 688 goto out; 689 } 690 691 /* Set real number of channels specified in creq->channels[] */ 692 creq->n_channels = i; 693 694 /* translate "Scan for SSID" request */ 695 if (wreq) { 696 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 697 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 698 return -EINVAL; 699 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 700 creq->ssids[0].ssid_len = wreq->essid_len; 701 } 702 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 703 creq->n_ssids = 0; 704 } 705 706 rdev->scan_req = creq; 707 err = rdev->ops->scan(wiphy, dev, creq); 708 if (err) { 709 rdev->scan_req = NULL; 710 kfree(creq); 711 } else { 712 nl80211_send_scan_start(rdev, dev); 713 dev_hold(dev); 714 } 715 out: 716 cfg80211_unlock_rdev(rdev); 717 return err; 718} 719EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 720 721static void ieee80211_scan_add_ies(struct iw_request_info *info, 722 struct cfg80211_bss *bss, 723 char **current_ev, char *end_buf) 724{ 725 u8 *pos, *end, *next; 726 struct iw_event iwe; 727 728 if (!bss->information_elements || 729 !bss->len_information_elements) 730 return; 731 732 /* 733 * If needed, fragment the IEs buffer (at IE boundaries) into short 734 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 735 */ 736 pos = bss->information_elements; 737 end = pos + bss->len_information_elements; 738 739 while (end - pos > IW_GENERIC_IE_MAX) { 740 next = pos + 2 + pos[1]; 741 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 742 next = next + 2 + next[1]; 743 744 memset(&iwe, 0, sizeof(iwe)); 745 iwe.cmd = IWEVGENIE; 746 iwe.u.data.length = next - pos; 747 *current_ev = iwe_stream_add_point(info, *current_ev, 748 end_buf, &iwe, pos); 749 750 pos = next; 751 } 752 753 if (end > pos) { 754 memset(&iwe, 0, sizeof(iwe)); 755 iwe.cmd = IWEVGENIE; 756 iwe.u.data.length = end - pos; 757 *current_ev = iwe_stream_add_point(info, *current_ev, 758 end_buf, &iwe, pos); 759 } 760} 761 762static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 763{ 764 unsigned long end = jiffies; 765 766 if (end >= start) 767 return jiffies_to_msecs(end - start); 768 769 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 770} 771 772static char * 773ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 774 struct cfg80211_internal_bss *bss, char *current_ev, 775 char *end_buf) 776{ 777 struct iw_event iwe; 778 u8 *buf, *cfg, *p; 779 u8 *ie = bss->pub.information_elements; 780 int rem = bss->pub.len_information_elements, i, sig; 781 bool ismesh = false; 782 783 memset(&iwe, 0, sizeof(iwe)); 784 iwe.cmd = SIOCGIWAP; 785 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 786 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 787 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 788 IW_EV_ADDR_LEN); 789 790 memset(&iwe, 0, sizeof(iwe)); 791 iwe.cmd = SIOCGIWFREQ; 792 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 793 iwe.u.freq.e = 0; 794 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 795 IW_EV_FREQ_LEN); 796 797 memset(&iwe, 0, sizeof(iwe)); 798 iwe.cmd = SIOCGIWFREQ; 799 iwe.u.freq.m = bss->pub.channel->center_freq; 800 iwe.u.freq.e = 6; 801 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 802 IW_EV_FREQ_LEN); 803 804 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 805 memset(&iwe, 0, sizeof(iwe)); 806 iwe.cmd = IWEVQUAL; 807 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 808 IW_QUAL_NOISE_INVALID | 809 IW_QUAL_QUAL_UPDATED; 810 switch (wiphy->signal_type) { 811 case CFG80211_SIGNAL_TYPE_MBM: 812 sig = bss->pub.signal / 100; 813 iwe.u.qual.level = sig; 814 iwe.u.qual.updated |= IW_QUAL_DBM; 815 if (sig < -110) /* rather bad */ 816 sig = -110; 817 else if (sig > -40) /* perfect */ 818 sig = -40; 819 /* will give a range of 0 .. 70 */ 820 iwe.u.qual.qual = sig + 110; 821 break; 822 case CFG80211_SIGNAL_TYPE_UNSPEC: 823 iwe.u.qual.level = bss->pub.signal; 824 /* will give range 0 .. 100 */ 825 iwe.u.qual.qual = bss->pub.signal; 826 break; 827 default: 828 /* not reached */ 829 break; 830 } 831 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 832 &iwe, IW_EV_QUAL_LEN); 833 } 834 835 memset(&iwe, 0, sizeof(iwe)); 836 iwe.cmd = SIOCGIWENCODE; 837 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 838 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 839 else 840 iwe.u.data.flags = IW_ENCODE_DISABLED; 841 iwe.u.data.length = 0; 842 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 843 &iwe, ""); 844 845 while (rem >= 2) { 846 /* invalid data */ 847 if (ie[1] > rem - 2) 848 break; 849 850 switch (ie[0]) { 851 case WLAN_EID_SSID: 852 memset(&iwe, 0, sizeof(iwe)); 853 iwe.cmd = SIOCGIWESSID; 854 iwe.u.data.length = ie[1]; 855 iwe.u.data.flags = 1; 856 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 857 &iwe, ie + 2); 858 break; 859 case WLAN_EID_MESH_ID: 860 memset(&iwe, 0, sizeof(iwe)); 861 iwe.cmd = SIOCGIWESSID; 862 iwe.u.data.length = ie[1]; 863 iwe.u.data.flags = 1; 864 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 865 &iwe, ie + 2); 866 break; 867 case WLAN_EID_MESH_CONFIG: 868 ismesh = true; 869 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 870 break; 871 buf = kmalloc(50, GFP_ATOMIC); 872 if (!buf) 873 break; 874 cfg = ie + 2; 875 memset(&iwe, 0, sizeof(iwe)); 876 iwe.cmd = IWEVCUSTOM; 877 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 878 "0x%02X", 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 Metric ID: 0x%02X", 884 cfg[1]); 885 iwe.u.data.length = strlen(buf); 886 current_ev = iwe_stream_add_point(info, current_ev, 887 end_buf, 888 &iwe, buf); 889 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 890 cfg[2]); 891 iwe.u.data.length = strlen(buf); 892 current_ev = iwe_stream_add_point(info, current_ev, 893 end_buf, 894 &iwe, buf); 895 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 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, "Authentication ID: 0x%02X", cfg[4]); 901 iwe.u.data.length = strlen(buf); 902 current_ev = iwe_stream_add_point(info, current_ev, 903 end_buf, 904 &iwe, buf); 905 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 906 iwe.u.data.length = strlen(buf); 907 current_ev = iwe_stream_add_point(info, current_ev, 908 end_buf, 909 &iwe, buf); 910 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 911 iwe.u.data.length = strlen(buf); 912 current_ev = iwe_stream_add_point(info, current_ev, 913 end_buf, 914 &iwe, buf); 915 kfree(buf); 916 break; 917 case WLAN_EID_SUPP_RATES: 918 case WLAN_EID_EXT_SUPP_RATES: 919 /* display all supported rates in readable format */ 920 p = current_ev + iwe_stream_lcp_len(info); 921 922 memset(&iwe, 0, sizeof(iwe)); 923 iwe.cmd = SIOCGIWRATE; 924 /* Those two flags are ignored... */ 925 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 926 927 for (i = 0; i < ie[1]; i++) { 928 iwe.u.bitrate.value = 929 ((ie[i + 2] & 0x7f) * 500000); 930 p = iwe_stream_add_value(info, current_ev, p, 931 end_buf, &iwe, IW_EV_PARAM_LEN); 932 } 933 current_ev = p; 934 break; 935 } 936 rem -= ie[1] + 2; 937 ie += ie[1] + 2; 938 } 939 940 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 941 || ismesh) { 942 memset(&iwe, 0, sizeof(iwe)); 943 iwe.cmd = SIOCGIWMODE; 944 if (ismesh) 945 iwe.u.mode = IW_MODE_MESH; 946 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 947 iwe.u.mode = IW_MODE_MASTER; 948 else 949 iwe.u.mode = IW_MODE_ADHOC; 950 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 951 &iwe, IW_EV_UINT_LEN); 952 } 953 954 buf = kmalloc(30, GFP_ATOMIC); 955 if (buf) { 956 memset(&iwe, 0, sizeof(iwe)); 957 iwe.cmd = IWEVCUSTOM; 958 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 959 iwe.u.data.length = strlen(buf); 960 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 961 &iwe, buf); 962 memset(&iwe, 0, sizeof(iwe)); 963 iwe.cmd = IWEVCUSTOM; 964 sprintf(buf, " Last beacon: %ums ago", 965 elapsed_jiffies_msecs(bss->ts)); 966 iwe.u.data.length = strlen(buf); 967 current_ev = iwe_stream_add_point(info, current_ev, 968 end_buf, &iwe, buf); 969 kfree(buf); 970 } 971 972 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 973 974 return current_ev; 975} 976 977 978static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 979 struct iw_request_info *info, 980 char *buf, size_t len) 981{ 982 char *current_ev = buf; 983 char *end_buf = buf + len; 984 struct cfg80211_internal_bss *bss; 985 986 spin_lock_bh(&dev->bss_lock); 987 cfg80211_bss_expire(dev); 988 989 list_for_each_entry(bss, &dev->bss_list, list) { 990 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 991 spin_unlock_bh(&dev->bss_lock); 992 return -E2BIG; 993 } 994 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 995 current_ev, end_buf); 996 } 997 spin_unlock_bh(&dev->bss_lock); 998 return current_ev - buf; 999} 1000 1001 1002int cfg80211_wext_giwscan(struct net_device *dev, 1003 struct iw_request_info *info, 1004 struct iw_point *data, char *extra) 1005{ 1006 struct cfg80211_registered_device *rdev; 1007 int res; 1008 1009 if (!netif_running(dev)) 1010 return -ENETDOWN; 1011 1012 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1013 1014 if (IS_ERR(rdev)) 1015 return PTR_ERR(rdev); 1016 1017 if (rdev->scan_req) { 1018 res = -EAGAIN; 1019 goto out; 1020 } 1021 1022 res = ieee80211_scan_results(rdev, info, extra, data->length); 1023 data->length = 0; 1024 if (res >= 0) { 1025 data->length = res; 1026 res = 0; 1027 } 1028 1029 out: 1030 cfg80211_unlock_rdev(rdev); 1031 return res; 1032} 1033EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1034#endif 1035