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_WIRELESS_EXT 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_WIRELESS_EXT 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 schedule_work(&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] != IEEE80211_MESH_CONFIG_LEN) 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, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 229 } 230 231 static int cmp_bss(struct cfg80211_bss *a, 232 struct cfg80211_bss *b) 233 { 234 int r; 235 236 if (a->channel != b->channel) 237 return b->channel->center_freq - a->channel->center_freq; 238 239 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 240 if (r) 241 return r; 242 243 if (is_zero_ether_addr(a->bssid)) { 244 r = cmp_ies(WLAN_EID_MESH_ID, 245 a->information_elements, 246 a->len_information_elements, 247 b->information_elements, 248 b->len_information_elements); 249 if (r) 250 return r; 251 return cmp_ies(WLAN_EID_MESH_CONFIG, 252 a->information_elements, 253 a->len_information_elements, 254 b->information_elements, 255 b->len_information_elements); 256 } 257 258 return cmp_ies(WLAN_EID_SSID, 259 a->information_elements, 260 a->len_information_elements, 261 b->information_elements, 262 b->len_information_elements); 263 } 264 265 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 266 struct ieee80211_channel *channel, 267 const u8 *bssid, 268 const u8 *ssid, size_t ssid_len, 269 u16 capa_mask, u16 capa_val) 270 { 271 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 272 struct cfg80211_internal_bss *bss, *res = NULL; 273 274 spin_lock_bh(&dev->bss_lock); 275 276 list_for_each_entry(bss, &dev->bss_list, list) { 277 if ((bss->pub.capability & capa_mask) != capa_val) 278 continue; 279 if (channel && bss->pub.channel != channel) 280 continue; 281 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 282 res = bss; 283 kref_get(&res->ref); 284 break; 285 } 286 } 287 288 spin_unlock_bh(&dev->bss_lock); 289 if (!res) 290 return NULL; 291 return &res->pub; 292 } 293 EXPORT_SYMBOL(cfg80211_get_bss); 294 295 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 296 struct ieee80211_channel *channel, 297 const u8 *meshid, size_t meshidlen, 298 const u8 *meshcfg) 299 { 300 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 301 struct cfg80211_internal_bss *bss, *res = NULL; 302 303 spin_lock_bh(&dev->bss_lock); 304 305 list_for_each_entry(bss, &dev->bss_list, list) { 306 if (channel && bss->pub.channel != channel) 307 continue; 308 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 309 res = bss; 310 kref_get(&res->ref); 311 break; 312 } 313 } 314 315 spin_unlock_bh(&dev->bss_lock); 316 if (!res) 317 return NULL; 318 return &res->pub; 319 } 320 EXPORT_SYMBOL(cfg80211_get_mesh); 321 322 323 static void rb_insert_bss(struct cfg80211_registered_device *dev, 324 struct cfg80211_internal_bss *bss) 325 { 326 struct rb_node **p = &dev->bss_tree.rb_node; 327 struct rb_node *parent = NULL; 328 struct cfg80211_internal_bss *tbss; 329 int cmp; 330 331 while (*p) { 332 parent = *p; 333 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 334 335 cmp = cmp_bss(&bss->pub, &tbss->pub); 336 337 if (WARN_ON(!cmp)) { 338 /* will sort of leak this BSS */ 339 return; 340 } 341 342 if (cmp < 0) 343 p = &(*p)->rb_left; 344 else 345 p = &(*p)->rb_right; 346 } 347 348 rb_link_node(&bss->rbn, parent, p); 349 rb_insert_color(&bss->rbn, &dev->bss_tree); 350 } 351 352 static struct cfg80211_internal_bss * 353 rb_find_bss(struct cfg80211_registered_device *dev, 354 struct cfg80211_internal_bss *res) 355 { 356 struct rb_node *n = dev->bss_tree.rb_node; 357 struct cfg80211_internal_bss *bss; 358 int r; 359 360 while (n) { 361 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 362 r = cmp_bss(&res->pub, &bss->pub); 363 364 if (r == 0) 365 return bss; 366 else if (r < 0) 367 n = n->rb_left; 368 else 369 n = n->rb_right; 370 } 371 372 return NULL; 373 } 374 375 static struct cfg80211_internal_bss * 376 cfg80211_bss_update(struct cfg80211_registered_device *dev, 377 struct cfg80211_internal_bss *res, 378 bool overwrite) 379 { 380 struct cfg80211_internal_bss *found = NULL; 381 const u8 *meshid, *meshcfg; 382 383 /* 384 * The reference to "res" is donated to this function. 385 */ 386 387 if (WARN_ON(!res->pub.channel)) { 388 kref_put(&res->ref, bss_release); 389 return NULL; 390 } 391 392 res->ts = jiffies; 393 394 if (is_zero_ether_addr(res->pub.bssid)) { 395 /* must be mesh, verify */ 396 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 397 res->pub.len_information_elements); 398 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 399 res->pub.information_elements, 400 res->pub.len_information_elements); 401 if (!meshid || !meshcfg || 402 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 403 /* bogus mesh */ 404 kref_put(&res->ref, bss_release); 405 return NULL; 406 } 407 } 408 409 spin_lock_bh(&dev->bss_lock); 410 411 found = rb_find_bss(dev, res); 412 413 if (found) { 414 found->pub.beacon_interval = res->pub.beacon_interval; 415 found->pub.tsf = res->pub.tsf; 416 found->pub.signal = res->pub.signal; 417 found->pub.capability = res->pub.capability; 418 found->ts = res->ts; 419 420 /* overwrite IEs */ 421 if (overwrite) { 422 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 423 size_t ielen = res->pub.len_information_elements; 424 425 if (!found->ies_allocated && ksize(found) >= used + ielen) { 426 memcpy(found->pub.information_elements, 427 res->pub.information_elements, ielen); 428 found->pub.len_information_elements = ielen; 429 } else { 430 u8 *ies = found->pub.information_elements; 431 432 if (found->ies_allocated) 433 ies = krealloc(ies, ielen, GFP_ATOMIC); 434 else 435 ies = kmalloc(ielen, GFP_ATOMIC); 436 437 if (ies) { 438 memcpy(ies, res->pub.information_elements, ielen); 439 found->ies_allocated = true; 440 found->pub.information_elements = ies; 441 found->pub.len_information_elements = ielen; 442 } 443 } 444 } 445 446 kref_put(&res->ref, bss_release); 447 } else { 448 /* this "consumes" the reference */ 449 list_add_tail(&res->list, &dev->bss_list); 450 rb_insert_bss(dev, res); 451 found = res; 452 } 453 454 dev->bss_generation++; 455 spin_unlock_bh(&dev->bss_lock); 456 457 kref_get(&found->ref); 458 return found; 459 } 460 461 struct cfg80211_bss* 462 cfg80211_inform_bss(struct wiphy *wiphy, 463 struct ieee80211_channel *channel, 464 const u8 *bssid, 465 u64 timestamp, u16 capability, u16 beacon_interval, 466 const u8 *ie, size_t ielen, 467 s32 signal, gfp_t gfp) 468 { 469 struct cfg80211_internal_bss *res; 470 size_t privsz; 471 472 if (WARN_ON(!wiphy)) 473 return NULL; 474 475 privsz = wiphy->bss_priv_size; 476 477 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 478 (signal < 0 || signal > 100))) 479 return NULL; 480 481 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 482 if (!res) 483 return NULL; 484 485 memcpy(res->pub.bssid, bssid, ETH_ALEN); 486 res->pub.channel = channel; 487 res->pub.signal = signal; 488 res->pub.tsf = timestamp; 489 res->pub.beacon_interval = beacon_interval; 490 res->pub.capability = capability; 491 /* point to after the private area */ 492 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 493 memcpy(res->pub.information_elements, ie, ielen); 494 res->pub.len_information_elements = ielen; 495 496 kref_init(&res->ref); 497 498 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); 499 if (!res) 500 return NULL; 501 502 if (res->pub.capability & WLAN_CAPABILITY_ESS) 503 regulatory_hint_found_beacon(wiphy, channel, gfp); 504 505 /* cfg80211_bss_update gives us a referenced result */ 506 return &res->pub; 507 } 508 EXPORT_SYMBOL(cfg80211_inform_bss); 509 510 struct cfg80211_bss * 511 cfg80211_inform_bss_frame(struct wiphy *wiphy, 512 struct ieee80211_channel *channel, 513 struct ieee80211_mgmt *mgmt, size_t len, 514 s32 signal, gfp_t gfp) 515 { 516 struct cfg80211_internal_bss *res; 517 size_t ielen = len - offsetof(struct ieee80211_mgmt, 518 u.probe_resp.variable); 519 bool overwrite; 520 size_t privsz = wiphy->bss_priv_size; 521 522 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 523 (signal < 0 || signal > 100))) 524 return NULL; 525 526 if (WARN_ON(!mgmt || !wiphy || 527 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 528 return NULL; 529 530 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 531 if (!res) 532 return NULL; 533 534 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 535 res->pub.channel = channel; 536 res->pub.signal = signal; 537 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 538 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 539 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 540 /* point to after the private area */ 541 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 542 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 543 res->pub.len_information_elements = ielen; 544 545 kref_init(&res->ref); 546 547 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 548 549 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 550 if (!res) 551 return NULL; 552 553 if (res->pub.capability & WLAN_CAPABILITY_ESS) 554 regulatory_hint_found_beacon(wiphy, channel, gfp); 555 556 /* cfg80211_bss_update gives us a referenced result */ 557 return &res->pub; 558 } 559 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 560 561 void cfg80211_put_bss(struct cfg80211_bss *pub) 562 { 563 struct cfg80211_internal_bss *bss; 564 565 if (!pub) 566 return; 567 568 bss = container_of(pub, struct cfg80211_internal_bss, pub); 569 kref_put(&bss->ref, bss_release); 570 } 571 EXPORT_SYMBOL(cfg80211_put_bss); 572 573 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 574 { 575 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 576 struct cfg80211_internal_bss *bss; 577 578 if (WARN_ON(!pub)) 579 return; 580 581 bss = container_of(pub, struct cfg80211_internal_bss, pub); 582 583 spin_lock_bh(&dev->bss_lock); 584 585 list_del(&bss->list); 586 dev->bss_generation++; 587 rb_erase(&bss->rbn, &dev->bss_tree); 588 589 spin_unlock_bh(&dev->bss_lock); 590 591 kref_put(&bss->ref, bss_release); 592 } 593 EXPORT_SYMBOL(cfg80211_unlink_bss); 594 595 #ifdef CONFIG_WIRELESS_EXT 596 int cfg80211_wext_siwscan(struct net_device *dev, 597 struct iw_request_info *info, 598 union iwreq_data *wrqu, char *extra) 599 { 600 struct cfg80211_registered_device *rdev; 601 struct wiphy *wiphy; 602 struct iw_scan_req *wreq = NULL; 603 struct cfg80211_scan_request *creq; 604 int i, err, n_channels = 0; 605 enum ieee80211_band band; 606 607 if (!netif_running(dev)) 608 return -ENETDOWN; 609 610 if (wrqu->data.length == sizeof(struct iw_scan_req)) 611 wreq = (struct iw_scan_req *)extra; 612 613 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 614 615 if (IS_ERR(rdev)) 616 return PTR_ERR(rdev); 617 618 if (rdev->scan_req) { 619 err = -EBUSY; 620 goto out; 621 } 622 623 wiphy = &rdev->wiphy; 624 625 /* Determine number of channels, needed to allocate creq */ 626 if (wreq && wreq->num_channels) 627 n_channels = wreq->num_channels; 628 else { 629 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 630 if (wiphy->bands[band]) 631 n_channels += wiphy->bands[band]->n_channels; 632 } 633 634 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 635 n_channels * sizeof(void *), 636 GFP_ATOMIC); 637 if (!creq) { 638 err = -ENOMEM; 639 goto out; 640 } 641 642 creq->wiphy = wiphy; 643 creq->dev = dev; 644 /* SSIDs come after channels */ 645 creq->ssids = (void *)&creq->channels[n_channels]; 646 creq->n_channels = n_channels; 647 creq->n_ssids = 1; 648 649 /* translate "Scan on frequencies" request */ 650 i = 0; 651 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 652 int j; 653 if (!wiphy->bands[band]) 654 continue; 655 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 656 657 /* If we have a wireless request structure and the 658 * wireless request specifies frequencies, then search 659 * for the matching hardware channel. 660 */ 661 if (wreq && wreq->num_channels) { 662 int k; 663 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 664 for (k = 0; k < wreq->num_channels; k++) { 665 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 666 if (wext_freq == wiphy_freq) 667 goto wext_freq_found; 668 } 669 goto wext_freq_not_found; 670 } 671 672 wext_freq_found: 673 creq->channels[i] = &wiphy->bands[band]->channels[j]; 674 i++; 675 wext_freq_not_found: ; 676 } 677 } 678 /* No channels found? */ 679 if (!i) { 680 err = -EINVAL; 681 goto out; 682 } 683 684 /* Set real number of channels specified in creq->channels[] */ 685 creq->n_channels = i; 686 687 /* translate "Scan for SSID" request */ 688 if (wreq) { 689 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 690 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 691 return -EINVAL; 692 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 693 creq->ssids[0].ssid_len = wreq->essid_len; 694 } 695 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 696 creq->n_ssids = 0; 697 } 698 699 rdev->scan_req = creq; 700 err = rdev->ops->scan(wiphy, dev, creq); 701 if (err) { 702 rdev->scan_req = NULL; 703 kfree(creq); 704 } else { 705 nl80211_send_scan_start(rdev, dev); 706 dev_hold(dev); 707 } 708 out: 709 cfg80211_unlock_rdev(rdev); 710 return err; 711 } 712 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 713 714 static void ieee80211_scan_add_ies(struct iw_request_info *info, 715 struct cfg80211_bss *bss, 716 char **current_ev, char *end_buf) 717 { 718 u8 *pos, *end, *next; 719 struct iw_event iwe; 720 721 if (!bss->information_elements || 722 !bss->len_information_elements) 723 return; 724 725 /* 726 * If needed, fragment the IEs buffer (at IE boundaries) into short 727 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 728 */ 729 pos = bss->information_elements; 730 end = pos + bss->len_information_elements; 731 732 while (end - pos > IW_GENERIC_IE_MAX) { 733 next = pos + 2 + pos[1]; 734 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 735 next = next + 2 + next[1]; 736 737 memset(&iwe, 0, sizeof(iwe)); 738 iwe.cmd = IWEVGENIE; 739 iwe.u.data.length = next - pos; 740 *current_ev = iwe_stream_add_point(info, *current_ev, 741 end_buf, &iwe, pos); 742 743 pos = next; 744 } 745 746 if (end > pos) { 747 memset(&iwe, 0, sizeof(iwe)); 748 iwe.cmd = IWEVGENIE; 749 iwe.u.data.length = end - pos; 750 *current_ev = iwe_stream_add_point(info, *current_ev, 751 end_buf, &iwe, pos); 752 } 753 } 754 755 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 756 { 757 unsigned long end = jiffies; 758 759 if (end >= start) 760 return jiffies_to_msecs(end - start); 761 762 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 763 } 764 765 static char * 766 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 767 struct cfg80211_internal_bss *bss, char *current_ev, 768 char *end_buf) 769 { 770 struct iw_event iwe; 771 u8 *buf, *cfg, *p; 772 u8 *ie = bss->pub.information_elements; 773 int rem = bss->pub.len_information_elements, i, sig; 774 bool ismesh = false; 775 776 memset(&iwe, 0, sizeof(iwe)); 777 iwe.cmd = SIOCGIWAP; 778 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 779 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 780 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 781 IW_EV_ADDR_LEN); 782 783 memset(&iwe, 0, sizeof(iwe)); 784 iwe.cmd = SIOCGIWFREQ; 785 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 786 iwe.u.freq.e = 0; 787 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 788 IW_EV_FREQ_LEN); 789 790 memset(&iwe, 0, sizeof(iwe)); 791 iwe.cmd = SIOCGIWFREQ; 792 iwe.u.freq.m = bss->pub.channel->center_freq; 793 iwe.u.freq.e = 6; 794 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 795 IW_EV_FREQ_LEN); 796 797 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 798 memset(&iwe, 0, sizeof(iwe)); 799 iwe.cmd = IWEVQUAL; 800 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 801 IW_QUAL_NOISE_INVALID | 802 IW_QUAL_QUAL_UPDATED; 803 switch (wiphy->signal_type) { 804 case CFG80211_SIGNAL_TYPE_MBM: 805 sig = bss->pub.signal / 100; 806 iwe.u.qual.level = sig; 807 iwe.u.qual.updated |= IW_QUAL_DBM; 808 if (sig < -110) /* rather bad */ 809 sig = -110; 810 else if (sig > -40) /* perfect */ 811 sig = -40; 812 /* will give a range of 0 .. 70 */ 813 iwe.u.qual.qual = sig + 110; 814 break; 815 case CFG80211_SIGNAL_TYPE_UNSPEC: 816 iwe.u.qual.level = bss->pub.signal; 817 /* will give range 0 .. 100 */ 818 iwe.u.qual.qual = bss->pub.signal; 819 break; 820 default: 821 /* not reached */ 822 break; 823 } 824 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 825 &iwe, IW_EV_QUAL_LEN); 826 } 827 828 memset(&iwe, 0, sizeof(iwe)); 829 iwe.cmd = SIOCGIWENCODE; 830 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 831 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 832 else 833 iwe.u.data.flags = IW_ENCODE_DISABLED; 834 iwe.u.data.length = 0; 835 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 836 &iwe, ""); 837 838 while (rem >= 2) { 839 /* invalid data */ 840 if (ie[1] > rem - 2) 841 break; 842 843 switch (ie[0]) { 844 case WLAN_EID_SSID: 845 memset(&iwe, 0, sizeof(iwe)); 846 iwe.cmd = SIOCGIWESSID; 847 iwe.u.data.length = ie[1]; 848 iwe.u.data.flags = 1; 849 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 850 &iwe, ie + 2); 851 break; 852 case WLAN_EID_MESH_ID: 853 memset(&iwe, 0, sizeof(iwe)); 854 iwe.cmd = SIOCGIWESSID; 855 iwe.u.data.length = ie[1]; 856 iwe.u.data.flags = 1; 857 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 858 &iwe, ie + 2); 859 break; 860 case WLAN_EID_MESH_CONFIG: 861 ismesh = true; 862 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 863 break; 864 buf = kmalloc(50, GFP_ATOMIC); 865 if (!buf) 866 break; 867 cfg = ie + 2; 868 memset(&iwe, 0, sizeof(iwe)); 869 iwe.cmd = IWEVCUSTOM; 870 sprintf(buf, "Mesh network (version %d)", cfg[0]); 871 iwe.u.data.length = strlen(buf); 872 current_ev = iwe_stream_add_point(info, current_ev, 873 end_buf, 874 &iwe, buf); 875 sprintf(buf, "Path Selection Protocol ID: " 876 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 877 cfg[4]); 878 iwe.u.data.length = strlen(buf); 879 current_ev = iwe_stream_add_point(info, current_ev, 880 end_buf, 881 &iwe, buf); 882 sprintf(buf, "Path Selection Metric ID: " 883 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 884 cfg[8]); 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: " 890 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 891 cfg[11], cfg[12]); 892 iwe.u.data.length = strlen(buf); 893 current_ev = iwe_stream_add_point(info, current_ev, 894 end_buf, 895 &iwe, buf); 896 sprintf(buf, "Channel Precedence: " 897 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 898 cfg[15], cfg[16]); 899 iwe.u.data.length = strlen(buf); 900 current_ev = iwe_stream_add_point(info, current_ev, 901 end_buf, 902 &iwe, buf); 903 kfree(buf); 904 break; 905 case WLAN_EID_SUPP_RATES: 906 case WLAN_EID_EXT_SUPP_RATES: 907 /* display all supported rates in readable format */ 908 p = current_ev + iwe_stream_lcp_len(info); 909 910 memset(&iwe, 0, sizeof(iwe)); 911 iwe.cmd = SIOCGIWRATE; 912 /* Those two flags are ignored... */ 913 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 914 915 for (i = 0; i < ie[1]; i++) { 916 iwe.u.bitrate.value = 917 ((ie[i + 2] & 0x7f) * 500000); 918 p = iwe_stream_add_value(info, current_ev, p, 919 end_buf, &iwe, IW_EV_PARAM_LEN); 920 } 921 current_ev = p; 922 break; 923 } 924 rem -= ie[1] + 2; 925 ie += ie[1] + 2; 926 } 927 928 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 929 || ismesh) { 930 memset(&iwe, 0, sizeof(iwe)); 931 iwe.cmd = SIOCGIWMODE; 932 if (ismesh) 933 iwe.u.mode = IW_MODE_MESH; 934 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 935 iwe.u.mode = IW_MODE_MASTER; 936 else 937 iwe.u.mode = IW_MODE_ADHOC; 938 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 939 &iwe, IW_EV_UINT_LEN); 940 } 941 942 buf = kmalloc(30, GFP_ATOMIC); 943 if (buf) { 944 memset(&iwe, 0, sizeof(iwe)); 945 iwe.cmd = IWEVCUSTOM; 946 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 947 iwe.u.data.length = strlen(buf); 948 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 949 &iwe, buf); 950 memset(&iwe, 0, sizeof(iwe)); 951 iwe.cmd = IWEVCUSTOM; 952 sprintf(buf, " Last beacon: %ums ago", 953 elapsed_jiffies_msecs(bss->ts)); 954 iwe.u.data.length = strlen(buf); 955 current_ev = iwe_stream_add_point(info, current_ev, 956 end_buf, &iwe, buf); 957 kfree(buf); 958 } 959 960 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 961 962 return current_ev; 963 } 964 965 966 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 967 struct iw_request_info *info, 968 char *buf, size_t len) 969 { 970 char *current_ev = buf; 971 char *end_buf = buf + len; 972 struct cfg80211_internal_bss *bss; 973 974 spin_lock_bh(&dev->bss_lock); 975 cfg80211_bss_expire(dev); 976 977 list_for_each_entry(bss, &dev->bss_list, list) { 978 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 979 spin_unlock_bh(&dev->bss_lock); 980 return -E2BIG; 981 } 982 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 983 current_ev, end_buf); 984 } 985 spin_unlock_bh(&dev->bss_lock); 986 return current_ev - buf; 987 } 988 989 990 int cfg80211_wext_giwscan(struct net_device *dev, 991 struct iw_request_info *info, 992 struct iw_point *data, char *extra) 993 { 994 struct cfg80211_registered_device *rdev; 995 int res; 996 997 if (!netif_running(dev)) 998 return -ENETDOWN; 999 1000 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1001 1002 if (IS_ERR(rdev)) 1003 return PTR_ERR(rdev); 1004 1005 if (rdev->scan_req) { 1006 res = -EAGAIN; 1007 goto out; 1008 } 1009 1010 res = ieee80211_scan_results(rdev, info, extra, data->length); 1011 data->length = 0; 1012 if (res >= 0) { 1013 data->length = res; 1014 res = 0; 1015 } 1016 1017 out: 1018 cfg80211_unlock_rdev(rdev); 1019 return res; 1020 } 1021 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1022 #endif 1023