scan.c revision 09f97e0fc4ae81f151bd76b97e28d2af429c1427
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 18#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) 19 20void __cfg80211_scan_done(struct work_struct *wk) 21{ 22 struct cfg80211_registered_device *rdev; 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 rdev = container_of(wk, struct cfg80211_registered_device, 30 scan_done_wk); 31 32 mutex_lock(&rdev->mtx); 33 request = rdev->scan_req; 34 35 dev = request->dev; 36 37 /* 38 * This must be before sending the other events! 39 * Otherwise, wpa_supplicant gets completely confused with 40 * wext events. 41 */ 42 cfg80211_sme_scan_done(dev); 43 44 if (request->aborted) 45 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); 46 else 47 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); 48 49#ifdef CONFIG_WIRELESS_EXT 50 if (!request->aborted) { 51 memset(&wrqu, 0, sizeof(wrqu)); 52 53 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 54 } 55#endif 56 57 dev_put(dev); 58 59 cfg80211_unlock_rdev(rdev); 60 wiphy_to_dev(request->wiphy)->scan_req = NULL; 61 kfree(request); 62} 63 64void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 65{ 66 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 67 68 request->aborted = aborted; 69 schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk); 70} 71EXPORT_SYMBOL(cfg80211_scan_done); 72 73static void bss_release(struct kref *ref) 74{ 75 struct cfg80211_internal_bss *bss; 76 77 bss = container_of(ref, struct cfg80211_internal_bss, ref); 78 if (bss->pub.free_priv) 79 bss->pub.free_priv(&bss->pub); 80 81 if (bss->ies_allocated) 82 kfree(bss->pub.information_elements); 83 84 BUG_ON(atomic_read(&bss->hold)); 85 86 kfree(bss); 87} 88 89/* must hold dev->bss_lock! */ 90void cfg80211_bss_age(struct cfg80211_registered_device *dev, 91 unsigned long age_secs) 92{ 93 struct cfg80211_internal_bss *bss; 94 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 95 96 list_for_each_entry(bss, &dev->bss_list, list) { 97 bss->ts -= age_jiffies; 98 } 99} 100 101/* must hold dev->bss_lock! */ 102void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 103{ 104 struct cfg80211_internal_bss *bss, *tmp; 105 bool expired = false; 106 107 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 108 if (atomic_read(&bss->hold)) 109 continue; 110 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 111 continue; 112 list_del(&bss->list); 113 rb_erase(&bss->rbn, &dev->bss_tree); 114 kref_put(&bss->ref, bss_release); 115 expired = true; 116 } 117 118 if (expired) 119 dev->bss_generation++; 120} 121 122static u8 *find_ie(u8 num, u8 *ies, size_t len) 123{ 124 while (len > 2 && ies[0] != num) { 125 len -= ies[1] + 2; 126 ies += ies[1] + 2; 127 } 128 if (len < 2) 129 return NULL; 130 if (len < 2 + ies[1]) 131 return NULL; 132 return ies; 133} 134 135static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 136{ 137 const u8 *ie1 = find_ie(num, ies1, len1); 138 const u8 *ie2 = find_ie(num, ies2, len2); 139 int r; 140 141 if (!ie1 && !ie2) 142 return 0; 143 if (!ie1) 144 return -1; 145 146 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 147 if (r == 0 && ie1[1] != ie2[1]) 148 return ie2[1] - ie1[1]; 149 return r; 150} 151 152static bool is_bss(struct cfg80211_bss *a, 153 const u8 *bssid, 154 const u8 *ssid, size_t ssid_len) 155{ 156 const u8 *ssidie; 157 158 if (bssid && compare_ether_addr(a->bssid, bssid)) 159 return false; 160 161 if (!ssid) 162 return true; 163 164 ssidie = find_ie(WLAN_EID_SSID, 165 a->information_elements, 166 a->len_information_elements); 167 if (!ssidie) 168 return false; 169 if (ssidie[1] != ssid_len) 170 return false; 171 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 172} 173 174static bool is_mesh(struct cfg80211_bss *a, 175 const u8 *meshid, size_t meshidlen, 176 const u8 *meshcfg) 177{ 178 const u8 *ie; 179 180 if (!is_zero_ether_addr(a->bssid)) 181 return false; 182 183 ie = find_ie(WLAN_EID_MESH_ID, 184 a->information_elements, 185 a->len_information_elements); 186 if (!ie) 187 return false; 188 if (ie[1] != meshidlen) 189 return false; 190 if (memcmp(ie + 2, meshid, meshidlen)) 191 return false; 192 193 ie = find_ie(WLAN_EID_MESH_CONFIG, 194 a->information_elements, 195 a->len_information_elements); 196 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 197 return false; 198 199 /* 200 * Ignore mesh capability (last two bytes of the IE) when 201 * comparing since that may differ between stations taking 202 * part in the same mesh. 203 */ 204 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 205} 206 207static int cmp_bss(struct cfg80211_bss *a, 208 struct cfg80211_bss *b) 209{ 210 int r; 211 212 if (a->channel != b->channel) 213 return b->channel->center_freq - a->channel->center_freq; 214 215 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 216 if (r) 217 return r; 218 219 if (is_zero_ether_addr(a->bssid)) { 220 r = cmp_ies(WLAN_EID_MESH_ID, 221 a->information_elements, 222 a->len_information_elements, 223 b->information_elements, 224 b->len_information_elements); 225 if (r) 226 return r; 227 return cmp_ies(WLAN_EID_MESH_CONFIG, 228 a->information_elements, 229 a->len_information_elements, 230 b->information_elements, 231 b->len_information_elements); 232 } 233 234 return cmp_ies(WLAN_EID_SSID, 235 a->information_elements, 236 a->len_information_elements, 237 b->information_elements, 238 b->len_information_elements); 239} 240 241struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 242 struct ieee80211_channel *channel, 243 const u8 *bssid, 244 const u8 *ssid, size_t ssid_len, 245 u16 capa_mask, u16 capa_val) 246{ 247 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 248 struct cfg80211_internal_bss *bss, *res = NULL; 249 250 spin_lock_bh(&dev->bss_lock); 251 252 list_for_each_entry(bss, &dev->bss_list, list) { 253 if ((bss->pub.capability & capa_mask) != capa_val) 254 continue; 255 if (channel && bss->pub.channel != channel) 256 continue; 257 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 258 res = bss; 259 kref_get(&res->ref); 260 break; 261 } 262 } 263 264 spin_unlock_bh(&dev->bss_lock); 265 if (!res) 266 return NULL; 267 return &res->pub; 268} 269EXPORT_SYMBOL(cfg80211_get_bss); 270 271struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 272 struct ieee80211_channel *channel, 273 const u8 *meshid, size_t meshidlen, 274 const u8 *meshcfg) 275{ 276 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 277 struct cfg80211_internal_bss *bss, *res = NULL; 278 279 spin_lock_bh(&dev->bss_lock); 280 281 list_for_each_entry(bss, &dev->bss_list, list) { 282 if (channel && bss->pub.channel != channel) 283 continue; 284 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 285 res = bss; 286 kref_get(&res->ref); 287 break; 288 } 289 } 290 291 spin_unlock_bh(&dev->bss_lock); 292 if (!res) 293 return NULL; 294 return &res->pub; 295} 296EXPORT_SYMBOL(cfg80211_get_mesh); 297 298 299static void rb_insert_bss(struct cfg80211_registered_device *dev, 300 struct cfg80211_internal_bss *bss) 301{ 302 struct rb_node **p = &dev->bss_tree.rb_node; 303 struct rb_node *parent = NULL; 304 struct cfg80211_internal_bss *tbss; 305 int cmp; 306 307 while (*p) { 308 parent = *p; 309 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 310 311 cmp = cmp_bss(&bss->pub, &tbss->pub); 312 313 if (WARN_ON(!cmp)) { 314 /* will sort of leak this BSS */ 315 return; 316 } 317 318 if (cmp < 0) 319 p = &(*p)->rb_left; 320 else 321 p = &(*p)->rb_right; 322 } 323 324 rb_link_node(&bss->rbn, parent, p); 325 rb_insert_color(&bss->rbn, &dev->bss_tree); 326} 327 328static struct cfg80211_internal_bss * 329rb_find_bss(struct cfg80211_registered_device *dev, 330 struct cfg80211_internal_bss *res) 331{ 332 struct rb_node *n = dev->bss_tree.rb_node; 333 struct cfg80211_internal_bss *bss; 334 int r; 335 336 while (n) { 337 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 338 r = cmp_bss(&res->pub, &bss->pub); 339 340 if (r == 0) 341 return bss; 342 else if (r < 0) 343 n = n->rb_left; 344 else 345 n = n->rb_right; 346 } 347 348 return NULL; 349} 350 351static struct cfg80211_internal_bss * 352cfg80211_bss_update(struct cfg80211_registered_device *dev, 353 struct cfg80211_internal_bss *res, 354 bool overwrite) 355{ 356 struct cfg80211_internal_bss *found = NULL; 357 const u8 *meshid, *meshcfg; 358 359 /* 360 * The reference to "res" is donated to this function. 361 */ 362 363 if (WARN_ON(!res->pub.channel)) { 364 kref_put(&res->ref, bss_release); 365 return NULL; 366 } 367 368 res->ts = jiffies; 369 370 if (is_zero_ether_addr(res->pub.bssid)) { 371 /* must be mesh, verify */ 372 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 373 res->pub.len_information_elements); 374 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 375 res->pub.information_elements, 376 res->pub.len_information_elements); 377 if (!meshid || !meshcfg || 378 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 379 /* bogus mesh */ 380 kref_put(&res->ref, bss_release); 381 return NULL; 382 } 383 } 384 385 spin_lock_bh(&dev->bss_lock); 386 387 found = rb_find_bss(dev, res); 388 389 if (found) { 390 found->pub.beacon_interval = res->pub.beacon_interval; 391 found->pub.tsf = res->pub.tsf; 392 found->pub.signal = res->pub.signal; 393 found->pub.capability = res->pub.capability; 394 found->ts = res->ts; 395 396 /* overwrite IEs */ 397 if (overwrite) { 398 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 399 size_t ielen = res->pub.len_information_elements; 400 401 if (!found->ies_allocated && ksize(found) >= used + ielen) { 402 memcpy(found->pub.information_elements, 403 res->pub.information_elements, ielen); 404 found->pub.len_information_elements = ielen; 405 } else { 406 u8 *ies = found->pub.information_elements; 407 408 if (found->ies_allocated) 409 ies = krealloc(ies, ielen, GFP_ATOMIC); 410 else 411 ies = kmalloc(ielen, GFP_ATOMIC); 412 413 if (ies) { 414 memcpy(ies, res->pub.information_elements, ielen); 415 found->ies_allocated = true; 416 found->pub.information_elements = ies; 417 found->pub.len_information_elements = ielen; 418 } 419 } 420 } 421 422 kref_put(&res->ref, bss_release); 423 } else { 424 /* this "consumes" the reference */ 425 list_add_tail(&res->list, &dev->bss_list); 426 rb_insert_bss(dev, res); 427 found = res; 428 } 429 430 dev->bss_generation++; 431 spin_unlock_bh(&dev->bss_lock); 432 433 kref_get(&found->ref); 434 return found; 435} 436 437struct cfg80211_bss* 438cfg80211_inform_bss(struct wiphy *wiphy, 439 struct ieee80211_channel *channel, 440 const u8 *bssid, 441 u64 timestamp, u16 capability, u16 beacon_interval, 442 const u8 *ie, size_t ielen, 443 s32 signal, gfp_t gfp) 444{ 445 struct cfg80211_internal_bss *res; 446 size_t privsz; 447 448 if (WARN_ON(!wiphy)) 449 return NULL; 450 451 privsz = wiphy->bss_priv_size; 452 453 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 454 (signal < 0 || signal > 100))) 455 return NULL; 456 457 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 458 if (!res) 459 return NULL; 460 461 memcpy(res->pub.bssid, bssid, ETH_ALEN); 462 res->pub.channel = channel; 463 res->pub.signal = signal; 464 res->pub.tsf = timestamp; 465 res->pub.beacon_interval = beacon_interval; 466 res->pub.capability = capability; 467 /* point to after the private area */ 468 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 469 memcpy(res->pub.information_elements, ie, ielen); 470 res->pub.len_information_elements = ielen; 471 472 kref_init(&res->ref); 473 474 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); 475 if (!res) 476 return NULL; 477 478 if (res->pub.capability & WLAN_CAPABILITY_ESS) 479 regulatory_hint_found_beacon(wiphy, channel, gfp); 480 481 /* cfg80211_bss_update gives us a referenced result */ 482 return &res->pub; 483} 484EXPORT_SYMBOL(cfg80211_inform_bss); 485 486struct cfg80211_bss * 487cfg80211_inform_bss_frame(struct wiphy *wiphy, 488 struct ieee80211_channel *channel, 489 struct ieee80211_mgmt *mgmt, size_t len, 490 s32 signal, gfp_t gfp) 491{ 492 struct cfg80211_internal_bss *res; 493 size_t ielen = len - offsetof(struct ieee80211_mgmt, 494 u.probe_resp.variable); 495 bool overwrite; 496 size_t privsz = wiphy->bss_priv_size; 497 498 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 499 (signal < 0 || signal > 100))) 500 return NULL; 501 502 if (WARN_ON(!mgmt || !wiphy || 503 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 504 return NULL; 505 506 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 507 if (!res) 508 return NULL; 509 510 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 511 res->pub.channel = channel; 512 res->pub.signal = signal; 513 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 514 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 515 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 516 /* point to after the private area */ 517 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 518 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 519 res->pub.len_information_elements = ielen; 520 521 kref_init(&res->ref); 522 523 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 524 525 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 526 if (!res) 527 return NULL; 528 529 if (res->pub.capability & WLAN_CAPABILITY_ESS) 530 regulatory_hint_found_beacon(wiphy, channel, gfp); 531 532 /* cfg80211_bss_update gives us a referenced result */ 533 return &res->pub; 534} 535EXPORT_SYMBOL(cfg80211_inform_bss_frame); 536 537void cfg80211_put_bss(struct cfg80211_bss *pub) 538{ 539 struct cfg80211_internal_bss *bss; 540 541 if (!pub) 542 return; 543 544 bss = container_of(pub, struct cfg80211_internal_bss, pub); 545 kref_put(&bss->ref, bss_release); 546} 547EXPORT_SYMBOL(cfg80211_put_bss); 548 549void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 550{ 551 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 552 struct cfg80211_internal_bss *bss; 553 554 if (WARN_ON(!pub)) 555 return; 556 557 bss = container_of(pub, struct cfg80211_internal_bss, pub); 558 559 spin_lock_bh(&dev->bss_lock); 560 561 list_del(&bss->list); 562 rb_erase(&bss->rbn, &dev->bss_tree); 563 564 spin_unlock_bh(&dev->bss_lock); 565 566 kref_put(&bss->ref, bss_release); 567} 568EXPORT_SYMBOL(cfg80211_unlink_bss); 569 570#ifdef CONFIG_WIRELESS_EXT 571int cfg80211_wext_siwscan(struct net_device *dev, 572 struct iw_request_info *info, 573 union iwreq_data *wrqu, char *extra) 574{ 575 struct cfg80211_registered_device *rdev; 576 struct wiphy *wiphy; 577 struct iw_scan_req *wreq = NULL; 578 struct cfg80211_scan_request *creq; 579 int i, err, n_channels = 0; 580 enum ieee80211_band band; 581 582 if (!netif_running(dev)) 583 return -ENETDOWN; 584 585 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 586 587 if (IS_ERR(rdev)) 588 return PTR_ERR(rdev); 589 590 if (rdev->scan_req) { 591 err = -EBUSY; 592 goto out; 593 } 594 595 wiphy = &rdev->wiphy; 596 597 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 598 if (wiphy->bands[band]) 599 n_channels += wiphy->bands[band]->n_channels; 600 601 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 602 n_channels * sizeof(void *), 603 GFP_ATOMIC); 604 if (!creq) { 605 err = -ENOMEM; 606 goto out; 607 } 608 609 creq->wiphy = wiphy; 610 creq->dev = dev; 611 creq->ssids = (void *)(creq + 1); 612 creq->channels = (void *)(creq->ssids + 1); 613 creq->n_channels = n_channels; 614 creq->n_ssids = 1; 615 616 /* all channels */ 617 i = 0; 618 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 619 int j; 620 if (!wiphy->bands[band]) 621 continue; 622 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 623 creq->channels[i] = &wiphy->bands[band]->channels[j]; 624 i++; 625 } 626 } 627 628 /* translate scan request */ 629 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 630 wreq = (struct iw_scan_req *)extra; 631 632 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 633 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 634 return -EINVAL; 635 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 636 creq->ssids[0].ssid_len = wreq->essid_len; 637 } 638 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 639 creq->n_ssids = 0; 640 } 641 642 rdev->scan_req = creq; 643 err = rdev->ops->scan(wiphy, dev, creq); 644 if (err) { 645 rdev->scan_req = NULL; 646 kfree(creq); 647 } else { 648 nl80211_send_scan_start(rdev, dev); 649 dev_hold(dev); 650 } 651 out: 652 cfg80211_unlock_rdev(rdev); 653 return err; 654} 655EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 656 657static void ieee80211_scan_add_ies(struct iw_request_info *info, 658 struct cfg80211_bss *bss, 659 char **current_ev, char *end_buf) 660{ 661 u8 *pos, *end, *next; 662 struct iw_event iwe; 663 664 if (!bss->information_elements || 665 !bss->len_information_elements) 666 return; 667 668 /* 669 * If needed, fragment the IEs buffer (at IE boundaries) into short 670 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 671 */ 672 pos = bss->information_elements; 673 end = pos + bss->len_information_elements; 674 675 while (end - pos > IW_GENERIC_IE_MAX) { 676 next = pos + 2 + pos[1]; 677 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 678 next = next + 2 + next[1]; 679 680 memset(&iwe, 0, sizeof(iwe)); 681 iwe.cmd = IWEVGENIE; 682 iwe.u.data.length = next - pos; 683 *current_ev = iwe_stream_add_point(info, *current_ev, 684 end_buf, &iwe, pos); 685 686 pos = next; 687 } 688 689 if (end > pos) { 690 memset(&iwe, 0, sizeof(iwe)); 691 iwe.cmd = IWEVGENIE; 692 iwe.u.data.length = end - pos; 693 *current_ev = iwe_stream_add_point(info, *current_ev, 694 end_buf, &iwe, pos); 695 } 696} 697 698static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 699{ 700 unsigned long end = jiffies; 701 702 if (end >= start) 703 return jiffies_to_msecs(end - start); 704 705 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 706} 707 708static char * 709ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 710 struct cfg80211_internal_bss *bss, char *current_ev, 711 char *end_buf) 712{ 713 struct iw_event iwe; 714 u8 *buf, *cfg, *p; 715 u8 *ie = bss->pub.information_elements; 716 int rem = bss->pub.len_information_elements, i, sig; 717 bool ismesh = false; 718 719 memset(&iwe, 0, sizeof(iwe)); 720 iwe.cmd = SIOCGIWAP; 721 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 722 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 723 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 724 IW_EV_ADDR_LEN); 725 726 memset(&iwe, 0, sizeof(iwe)); 727 iwe.cmd = SIOCGIWFREQ; 728 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 729 iwe.u.freq.e = 0; 730 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 731 IW_EV_FREQ_LEN); 732 733 memset(&iwe, 0, sizeof(iwe)); 734 iwe.cmd = SIOCGIWFREQ; 735 iwe.u.freq.m = bss->pub.channel->center_freq; 736 iwe.u.freq.e = 6; 737 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 738 IW_EV_FREQ_LEN); 739 740 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 741 memset(&iwe, 0, sizeof(iwe)); 742 iwe.cmd = IWEVQUAL; 743 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 744 IW_QUAL_NOISE_INVALID | 745 IW_QUAL_QUAL_UPDATED; 746 switch (wiphy->signal_type) { 747 case CFG80211_SIGNAL_TYPE_MBM: 748 sig = bss->pub.signal / 100; 749 iwe.u.qual.level = sig; 750 iwe.u.qual.updated |= IW_QUAL_DBM; 751 if (sig < -110) /* rather bad */ 752 sig = -110; 753 else if (sig > -40) /* perfect */ 754 sig = -40; 755 /* will give a range of 0 .. 70 */ 756 iwe.u.qual.qual = sig + 110; 757 break; 758 case CFG80211_SIGNAL_TYPE_UNSPEC: 759 iwe.u.qual.level = bss->pub.signal; 760 /* will give range 0 .. 100 */ 761 iwe.u.qual.qual = bss->pub.signal; 762 break; 763 default: 764 /* not reached */ 765 break; 766 } 767 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 768 &iwe, IW_EV_QUAL_LEN); 769 } 770 771 memset(&iwe, 0, sizeof(iwe)); 772 iwe.cmd = SIOCGIWENCODE; 773 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 774 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 775 else 776 iwe.u.data.flags = IW_ENCODE_DISABLED; 777 iwe.u.data.length = 0; 778 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 779 &iwe, ""); 780 781 while (rem >= 2) { 782 /* invalid data */ 783 if (ie[1] > rem - 2) 784 break; 785 786 switch (ie[0]) { 787 case WLAN_EID_SSID: 788 memset(&iwe, 0, sizeof(iwe)); 789 iwe.cmd = SIOCGIWESSID; 790 iwe.u.data.length = ie[1]; 791 iwe.u.data.flags = 1; 792 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 793 &iwe, ie + 2); 794 break; 795 case WLAN_EID_MESH_ID: 796 memset(&iwe, 0, sizeof(iwe)); 797 iwe.cmd = SIOCGIWESSID; 798 iwe.u.data.length = ie[1]; 799 iwe.u.data.flags = 1; 800 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 801 &iwe, ie + 2); 802 break; 803 case WLAN_EID_MESH_CONFIG: 804 ismesh = true; 805 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 806 break; 807 buf = kmalloc(50, GFP_ATOMIC); 808 if (!buf) 809 break; 810 cfg = ie + 2; 811 memset(&iwe, 0, sizeof(iwe)); 812 iwe.cmd = IWEVCUSTOM; 813 sprintf(buf, "Mesh network (version %d)", cfg[0]); 814 iwe.u.data.length = strlen(buf); 815 current_ev = iwe_stream_add_point(info, current_ev, 816 end_buf, 817 &iwe, buf); 818 sprintf(buf, "Path Selection Protocol ID: " 819 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 820 cfg[4]); 821 iwe.u.data.length = strlen(buf); 822 current_ev = iwe_stream_add_point(info, current_ev, 823 end_buf, 824 &iwe, buf); 825 sprintf(buf, "Path Selection Metric ID: " 826 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 827 cfg[8]); 828 iwe.u.data.length = strlen(buf); 829 current_ev = iwe_stream_add_point(info, current_ev, 830 end_buf, 831 &iwe, buf); 832 sprintf(buf, "Congestion Control Mode ID: " 833 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 834 cfg[11], cfg[12]); 835 iwe.u.data.length = strlen(buf); 836 current_ev = iwe_stream_add_point(info, current_ev, 837 end_buf, 838 &iwe, buf); 839 sprintf(buf, "Channel Precedence: " 840 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 841 cfg[15], cfg[16]); 842 iwe.u.data.length = strlen(buf); 843 current_ev = iwe_stream_add_point(info, current_ev, 844 end_buf, 845 &iwe, buf); 846 kfree(buf); 847 break; 848 case WLAN_EID_SUPP_RATES: 849 case WLAN_EID_EXT_SUPP_RATES: 850 /* display all supported rates in readable format */ 851 p = current_ev + iwe_stream_lcp_len(info); 852 853 memset(&iwe, 0, sizeof(iwe)); 854 iwe.cmd = SIOCGIWRATE; 855 /* Those two flags are ignored... */ 856 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 857 858 for (i = 0; i < ie[1]; i++) { 859 iwe.u.bitrate.value = 860 ((ie[i + 2] & 0x7f) * 500000); 861 p = iwe_stream_add_value(info, current_ev, p, 862 end_buf, &iwe, IW_EV_PARAM_LEN); 863 } 864 current_ev = p; 865 break; 866 } 867 rem -= ie[1] + 2; 868 ie += ie[1] + 2; 869 } 870 871 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 872 || ismesh) { 873 memset(&iwe, 0, sizeof(iwe)); 874 iwe.cmd = SIOCGIWMODE; 875 if (ismesh) 876 iwe.u.mode = IW_MODE_MESH; 877 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 878 iwe.u.mode = IW_MODE_MASTER; 879 else 880 iwe.u.mode = IW_MODE_ADHOC; 881 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 882 &iwe, IW_EV_UINT_LEN); 883 } 884 885 buf = kmalloc(30, GFP_ATOMIC); 886 if (buf) { 887 memset(&iwe, 0, sizeof(iwe)); 888 iwe.cmd = IWEVCUSTOM; 889 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 890 iwe.u.data.length = strlen(buf); 891 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 892 &iwe, buf); 893 memset(&iwe, 0, sizeof(iwe)); 894 iwe.cmd = IWEVCUSTOM; 895 sprintf(buf, " Last beacon: %ums ago", 896 elapsed_jiffies_msecs(bss->ts)); 897 iwe.u.data.length = strlen(buf); 898 current_ev = iwe_stream_add_point(info, current_ev, 899 end_buf, &iwe, buf); 900 kfree(buf); 901 } 902 903 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 904 905 return current_ev; 906} 907 908 909static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 910 struct iw_request_info *info, 911 char *buf, size_t len) 912{ 913 char *current_ev = buf; 914 char *end_buf = buf + len; 915 struct cfg80211_internal_bss *bss; 916 917 spin_lock_bh(&dev->bss_lock); 918 cfg80211_bss_expire(dev); 919 920 list_for_each_entry(bss, &dev->bss_list, list) { 921 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 922 spin_unlock_bh(&dev->bss_lock); 923 return -E2BIG; 924 } 925 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 926 current_ev, end_buf); 927 } 928 spin_unlock_bh(&dev->bss_lock); 929 return current_ev - buf; 930} 931 932 933int cfg80211_wext_giwscan(struct net_device *dev, 934 struct iw_request_info *info, 935 struct iw_point *data, char *extra) 936{ 937 struct cfg80211_registered_device *rdev; 938 int res; 939 940 if (!netif_running(dev)) 941 return -ENETDOWN; 942 943 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 944 945 if (IS_ERR(rdev)) 946 return PTR_ERR(rdev); 947 948 if (rdev->scan_req) { 949 res = -EAGAIN; 950 goto out; 951 } 952 953 res = ieee80211_scan_results(rdev, info, extra, data->length); 954 data->length = 0; 955 if (res >= 0) { 956 data->length = res; 957 res = 0; 958 } 959 960 out: 961 cfg80211_unlock_rdev(rdev); 962 return res; 963} 964EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 965#endif 966