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 21 void ___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 74 void __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 86 void 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 } 93 EXPORT_SYMBOL(cfg80211_scan_done); 94 95 static 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! */ 112 void 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! */ 124 void 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 } 143 144 static 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 } 156 157 static 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 } 173 174 static 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 } 195 196 static 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 } 231 232 static 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 } 265 266 struct 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 } 294 EXPORT_SYMBOL(cfg80211_get_bss); 295 296 struct 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 } 321 EXPORT_SYMBOL(cfg80211_get_mesh); 322 323 324 static 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 } 352 353 static struct cfg80211_internal_bss * 354 rb_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 } 375 376 static struct cfg80211_internal_bss * 377 cfg80211_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 } 461 462 struct cfg80211_bss* 463 cfg80211_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 } 509 EXPORT_SYMBOL(cfg80211_inform_bss); 510 511 struct cfg80211_bss * 512 cfg80211_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 } 560 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 561 562 void 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 } 572 EXPORT_SYMBOL(cfg80211_put_bss); 573 574 void 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 } 594 EXPORT_SYMBOL(cfg80211_unlink_bss); 595 596 #ifdef CONFIG_CFG80211_WEXT 597 int 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 = NULL; 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 err = -EINVAL; 699 goto out; 700 } 701 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 702 creq->ssids[0].ssid_len = wreq->essid_len; 703 } 704 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 705 creq->n_ssids = 0; 706 } 707 708 rdev->scan_req = creq; 709 err = rdev->ops->scan(wiphy, dev, creq); 710 if (err) { 711 rdev->scan_req = NULL; 712 /* creq will be freed below */ 713 } else { 714 nl80211_send_scan_start(rdev, dev); 715 /* creq now owned by driver */ 716 creq = NULL; 717 dev_hold(dev); 718 } 719 out: 720 kfree(creq); 721 cfg80211_unlock_rdev(rdev); 722 return err; 723 } 724 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 725 726 static void ieee80211_scan_add_ies(struct iw_request_info *info, 727 struct cfg80211_bss *bss, 728 char **current_ev, char *end_buf) 729 { 730 u8 *pos, *end, *next; 731 struct iw_event iwe; 732 733 if (!bss->information_elements || 734 !bss->len_information_elements) 735 return; 736 737 /* 738 * If needed, fragment the IEs buffer (at IE boundaries) into short 739 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 740 */ 741 pos = bss->information_elements; 742 end = pos + bss->len_information_elements; 743 744 while (end - pos > IW_GENERIC_IE_MAX) { 745 next = pos + 2 + pos[1]; 746 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 747 next = next + 2 + next[1]; 748 749 memset(&iwe, 0, sizeof(iwe)); 750 iwe.cmd = IWEVGENIE; 751 iwe.u.data.length = next - pos; 752 *current_ev = iwe_stream_add_point(info, *current_ev, 753 end_buf, &iwe, pos); 754 755 pos = next; 756 } 757 758 if (end > pos) { 759 memset(&iwe, 0, sizeof(iwe)); 760 iwe.cmd = IWEVGENIE; 761 iwe.u.data.length = end - pos; 762 *current_ev = iwe_stream_add_point(info, *current_ev, 763 end_buf, &iwe, pos); 764 } 765 } 766 767 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 768 { 769 unsigned long end = jiffies; 770 771 if (end >= start) 772 return jiffies_to_msecs(end - start); 773 774 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 775 } 776 777 static char * 778 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 779 struct cfg80211_internal_bss *bss, char *current_ev, 780 char *end_buf) 781 { 782 struct iw_event iwe; 783 u8 *buf, *cfg, *p; 784 u8 *ie = bss->pub.information_elements; 785 int rem = bss->pub.len_information_elements, i, sig; 786 bool ismesh = false; 787 788 memset(&iwe, 0, sizeof(iwe)); 789 iwe.cmd = SIOCGIWAP; 790 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 791 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 792 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 793 IW_EV_ADDR_LEN); 794 795 memset(&iwe, 0, sizeof(iwe)); 796 iwe.cmd = SIOCGIWFREQ; 797 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 798 iwe.u.freq.e = 0; 799 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 800 IW_EV_FREQ_LEN); 801 802 memset(&iwe, 0, sizeof(iwe)); 803 iwe.cmd = SIOCGIWFREQ; 804 iwe.u.freq.m = bss->pub.channel->center_freq; 805 iwe.u.freq.e = 6; 806 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 807 IW_EV_FREQ_LEN); 808 809 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 810 memset(&iwe, 0, sizeof(iwe)); 811 iwe.cmd = IWEVQUAL; 812 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 813 IW_QUAL_NOISE_INVALID | 814 IW_QUAL_QUAL_UPDATED; 815 switch (wiphy->signal_type) { 816 case CFG80211_SIGNAL_TYPE_MBM: 817 sig = bss->pub.signal / 100; 818 iwe.u.qual.level = sig; 819 iwe.u.qual.updated |= IW_QUAL_DBM; 820 if (sig < -110) /* rather bad */ 821 sig = -110; 822 else if (sig > -40) /* perfect */ 823 sig = -40; 824 /* will give a range of 0 .. 70 */ 825 iwe.u.qual.qual = sig + 110; 826 break; 827 case CFG80211_SIGNAL_TYPE_UNSPEC: 828 iwe.u.qual.level = bss->pub.signal; 829 /* will give range 0 .. 100 */ 830 iwe.u.qual.qual = bss->pub.signal; 831 break; 832 default: 833 /* not reached */ 834 break; 835 } 836 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 837 &iwe, IW_EV_QUAL_LEN); 838 } 839 840 memset(&iwe, 0, sizeof(iwe)); 841 iwe.cmd = SIOCGIWENCODE; 842 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 843 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 844 else 845 iwe.u.data.flags = IW_ENCODE_DISABLED; 846 iwe.u.data.length = 0; 847 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 848 &iwe, ""); 849 850 while (rem >= 2) { 851 /* invalid data */ 852 if (ie[1] > rem - 2) 853 break; 854 855 switch (ie[0]) { 856 case WLAN_EID_SSID: 857 memset(&iwe, 0, sizeof(iwe)); 858 iwe.cmd = SIOCGIWESSID; 859 iwe.u.data.length = ie[1]; 860 iwe.u.data.flags = 1; 861 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 862 &iwe, ie + 2); 863 break; 864 case WLAN_EID_MESH_ID: 865 memset(&iwe, 0, sizeof(iwe)); 866 iwe.cmd = SIOCGIWESSID; 867 iwe.u.data.length = ie[1]; 868 iwe.u.data.flags = 1; 869 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 870 &iwe, ie + 2); 871 break; 872 case WLAN_EID_MESH_CONFIG: 873 ismesh = true; 874 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 875 break; 876 buf = kmalloc(50, GFP_ATOMIC); 877 if (!buf) 878 break; 879 cfg = ie + 2; 880 memset(&iwe, 0, sizeof(iwe)); 881 iwe.cmd = IWEVCUSTOM; 882 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 883 "0x%02X", cfg[0]); 884 iwe.u.data.length = strlen(buf); 885 current_ev = iwe_stream_add_point(info, current_ev, 886 end_buf, 887 &iwe, buf); 888 sprintf(buf, "Path Selection Metric ID: 0x%02X", 889 cfg[1]); 890 iwe.u.data.length = strlen(buf); 891 current_ev = iwe_stream_add_point(info, current_ev, 892 end_buf, 893 &iwe, buf); 894 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 895 cfg[2]); 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, "Synchronization ID: 0x%02X", cfg[3]); 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, "Authentication ID: 0x%02X", cfg[4]); 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, "Formation Info: 0x%02X", cfg[5]); 911 iwe.u.data.length = strlen(buf); 912 current_ev = iwe_stream_add_point(info, current_ev, 913 end_buf, 914 &iwe, buf); 915 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 916 iwe.u.data.length = strlen(buf); 917 current_ev = iwe_stream_add_point(info, current_ev, 918 end_buf, 919 &iwe, buf); 920 kfree(buf); 921 break; 922 case WLAN_EID_SUPP_RATES: 923 case WLAN_EID_EXT_SUPP_RATES: 924 /* display all supported rates in readable format */ 925 p = current_ev + iwe_stream_lcp_len(info); 926 927 memset(&iwe, 0, sizeof(iwe)); 928 iwe.cmd = SIOCGIWRATE; 929 /* Those two flags are ignored... */ 930 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 931 932 for (i = 0; i < ie[1]; i++) { 933 iwe.u.bitrate.value = 934 ((ie[i + 2] & 0x7f) * 500000); 935 p = iwe_stream_add_value(info, current_ev, p, 936 end_buf, &iwe, IW_EV_PARAM_LEN); 937 } 938 current_ev = p; 939 break; 940 } 941 rem -= ie[1] + 2; 942 ie += ie[1] + 2; 943 } 944 945 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 946 ismesh) { 947 memset(&iwe, 0, sizeof(iwe)); 948 iwe.cmd = SIOCGIWMODE; 949 if (ismesh) 950 iwe.u.mode = IW_MODE_MESH; 951 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 952 iwe.u.mode = IW_MODE_MASTER; 953 else 954 iwe.u.mode = IW_MODE_ADHOC; 955 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 956 &iwe, IW_EV_UINT_LEN); 957 } 958 959 buf = kmalloc(30, GFP_ATOMIC); 960 if (buf) { 961 memset(&iwe, 0, sizeof(iwe)); 962 iwe.cmd = IWEVCUSTOM; 963 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 964 iwe.u.data.length = strlen(buf); 965 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 966 &iwe, buf); 967 memset(&iwe, 0, sizeof(iwe)); 968 iwe.cmd = IWEVCUSTOM; 969 sprintf(buf, " Last beacon: %ums ago", 970 elapsed_jiffies_msecs(bss->ts)); 971 iwe.u.data.length = strlen(buf); 972 current_ev = iwe_stream_add_point(info, current_ev, 973 end_buf, &iwe, buf); 974 kfree(buf); 975 } 976 977 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 978 979 return current_ev; 980 } 981 982 983 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 984 struct iw_request_info *info, 985 char *buf, size_t len) 986 { 987 char *current_ev = buf; 988 char *end_buf = buf + len; 989 struct cfg80211_internal_bss *bss; 990 991 spin_lock_bh(&dev->bss_lock); 992 cfg80211_bss_expire(dev); 993 994 list_for_each_entry(bss, &dev->bss_list, list) { 995 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 996 spin_unlock_bh(&dev->bss_lock); 997 return -E2BIG; 998 } 999 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1000 current_ev, end_buf); 1001 } 1002 spin_unlock_bh(&dev->bss_lock); 1003 return current_ev - buf; 1004 } 1005 1006 1007 int cfg80211_wext_giwscan(struct net_device *dev, 1008 struct iw_request_info *info, 1009 struct iw_point *data, char *extra) 1010 { 1011 struct cfg80211_registered_device *rdev; 1012 int res; 1013 1014 if (!netif_running(dev)) 1015 return -ENETDOWN; 1016 1017 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1018 1019 if (IS_ERR(rdev)) 1020 return PTR_ERR(rdev); 1021 1022 if (rdev->scan_req) { 1023 res = -EAGAIN; 1024 goto out; 1025 } 1026 1027 res = ieee80211_scan_results(rdev, info, extra, data->length); 1028 data->length = 0; 1029 if (res >= 0) { 1030 data->length = res; 1031 res = 0; 1032 } 1033 1034 out: 1035 cfg80211_unlock_rdev(rdev); 1036 return res; 1037 } 1038 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1039 #endif 1040