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 (10 * HZ) 19 20 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 21 { 22 struct net_device *dev; 23 #ifdef CONFIG_WIRELESS_EXT 24 union iwreq_data wrqu; 25 #endif 26 27 dev = dev_get_by_index(&init_net, request->ifidx); 28 if (!dev) 29 goto out; 30 31 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 32 33 if (aborted) 34 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); 35 else 36 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); 37 38 #ifdef CONFIG_WIRELESS_EXT 39 if (!aborted) { 40 memset(&wrqu, 0, sizeof(wrqu)); 41 42 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 43 } 44 #endif 45 46 dev_put(dev); 47 48 out: 49 wiphy_to_dev(request->wiphy)->scan_req = NULL; 50 kfree(request); 51 } 52 EXPORT_SYMBOL(cfg80211_scan_done); 53 54 static void bss_release(struct kref *ref) 55 { 56 struct cfg80211_internal_bss *bss; 57 58 bss = container_of(ref, struct cfg80211_internal_bss, ref); 59 if (bss->pub.free_priv) 60 bss->pub.free_priv(&bss->pub); 61 62 if (bss->ies_allocated) 63 kfree(bss->pub.information_elements); 64 65 kfree(bss); 66 } 67 68 /* must hold dev->bss_lock! */ 69 void cfg80211_bss_age(struct cfg80211_registered_device *dev, 70 unsigned long age_secs) 71 { 72 struct cfg80211_internal_bss *bss; 73 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 74 75 list_for_each_entry(bss, &dev->bss_list, list) { 76 bss->ts -= age_jiffies; 77 } 78 } 79 80 /* must hold dev->bss_lock! */ 81 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 82 { 83 struct cfg80211_internal_bss *bss, *tmp; 84 bool expired = false; 85 86 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 87 if (bss->hold || 88 !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 89 continue; 90 list_del(&bss->list); 91 rb_erase(&bss->rbn, &dev->bss_tree); 92 kref_put(&bss->ref, bss_release); 93 expired = true; 94 } 95 96 if (expired) 97 dev->bss_generation++; 98 } 99 100 static u8 *find_ie(u8 num, u8 *ies, size_t len) 101 { 102 while (len > 2 && ies[0] != num) { 103 len -= ies[1] + 2; 104 ies += ies[1] + 2; 105 } 106 if (len < 2) 107 return NULL; 108 if (len < 2 + ies[1]) 109 return NULL; 110 return ies; 111 } 112 113 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 114 { 115 const u8 *ie1 = find_ie(num, ies1, len1); 116 const u8 *ie2 = find_ie(num, ies2, len2); 117 int r; 118 119 if (!ie1 && !ie2) 120 return 0; 121 if (!ie1) 122 return -1; 123 124 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 125 if (r == 0 && ie1[1] != ie2[1]) 126 return ie2[1] - ie1[1]; 127 return r; 128 } 129 130 static bool is_bss(struct cfg80211_bss *a, 131 const u8 *bssid, 132 const u8 *ssid, size_t ssid_len) 133 { 134 const u8 *ssidie; 135 136 if (bssid && compare_ether_addr(a->bssid, bssid)) 137 return false; 138 139 if (!ssid) 140 return true; 141 142 ssidie = find_ie(WLAN_EID_SSID, 143 a->information_elements, 144 a->len_information_elements); 145 if (!ssidie) 146 return false; 147 if (ssidie[1] != ssid_len) 148 return false; 149 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 150 } 151 152 static bool is_mesh(struct cfg80211_bss *a, 153 const u8 *meshid, size_t meshidlen, 154 const u8 *meshcfg) 155 { 156 const u8 *ie; 157 158 if (!is_zero_ether_addr(a->bssid)) 159 return false; 160 161 ie = find_ie(WLAN_EID_MESH_ID, 162 a->information_elements, 163 a->len_information_elements); 164 if (!ie) 165 return false; 166 if (ie[1] != meshidlen) 167 return false; 168 if (memcmp(ie + 2, meshid, meshidlen)) 169 return false; 170 171 ie = find_ie(WLAN_EID_MESH_CONFIG, 172 a->information_elements, 173 a->len_information_elements); 174 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 175 return false; 176 177 /* 178 * Ignore mesh capability (last two bytes of the IE) when 179 * comparing since that may differ between stations taking 180 * part in the same mesh. 181 */ 182 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 183 } 184 185 static int cmp_bss(struct cfg80211_bss *a, 186 struct cfg80211_bss *b) 187 { 188 int r; 189 190 if (a->channel != b->channel) 191 return b->channel->center_freq - a->channel->center_freq; 192 193 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 194 if (r) 195 return r; 196 197 if (is_zero_ether_addr(a->bssid)) { 198 r = cmp_ies(WLAN_EID_MESH_ID, 199 a->information_elements, 200 a->len_information_elements, 201 b->information_elements, 202 b->len_information_elements); 203 if (r) 204 return r; 205 return cmp_ies(WLAN_EID_MESH_CONFIG, 206 a->information_elements, 207 a->len_information_elements, 208 b->information_elements, 209 b->len_information_elements); 210 } 211 212 return cmp_ies(WLAN_EID_SSID, 213 a->information_elements, 214 a->len_information_elements, 215 b->information_elements, 216 b->len_information_elements); 217 } 218 219 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 220 struct ieee80211_channel *channel, 221 const u8 *bssid, 222 const u8 *ssid, size_t ssid_len, 223 u16 capa_mask, u16 capa_val) 224 { 225 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 226 struct cfg80211_internal_bss *bss, *res = NULL; 227 228 spin_lock_bh(&dev->bss_lock); 229 230 list_for_each_entry(bss, &dev->bss_list, list) { 231 if ((bss->pub.capability & capa_mask) != capa_val) 232 continue; 233 if (channel && bss->pub.channel != channel) 234 continue; 235 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 236 res = bss; 237 kref_get(&res->ref); 238 break; 239 } 240 } 241 242 spin_unlock_bh(&dev->bss_lock); 243 if (!res) 244 return NULL; 245 return &res->pub; 246 } 247 EXPORT_SYMBOL(cfg80211_get_bss); 248 249 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 250 struct ieee80211_channel *channel, 251 const u8 *meshid, size_t meshidlen, 252 const u8 *meshcfg) 253 { 254 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 255 struct cfg80211_internal_bss *bss, *res = NULL; 256 257 spin_lock_bh(&dev->bss_lock); 258 259 list_for_each_entry(bss, &dev->bss_list, list) { 260 if (channel && bss->pub.channel != channel) 261 continue; 262 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 263 res = bss; 264 kref_get(&res->ref); 265 break; 266 } 267 } 268 269 spin_unlock_bh(&dev->bss_lock); 270 if (!res) 271 return NULL; 272 return &res->pub; 273 } 274 EXPORT_SYMBOL(cfg80211_get_mesh); 275 276 277 static void rb_insert_bss(struct cfg80211_registered_device *dev, 278 struct cfg80211_internal_bss *bss) 279 { 280 struct rb_node **p = &dev->bss_tree.rb_node; 281 struct rb_node *parent = NULL; 282 struct cfg80211_internal_bss *tbss; 283 int cmp; 284 285 while (*p) { 286 parent = *p; 287 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 288 289 cmp = cmp_bss(&bss->pub, &tbss->pub); 290 291 if (WARN_ON(!cmp)) { 292 /* will sort of leak this BSS */ 293 return; 294 } 295 296 if (cmp < 0) 297 p = &(*p)->rb_left; 298 else 299 p = &(*p)->rb_right; 300 } 301 302 rb_link_node(&bss->rbn, parent, p); 303 rb_insert_color(&bss->rbn, &dev->bss_tree); 304 } 305 306 static struct cfg80211_internal_bss * 307 rb_find_bss(struct cfg80211_registered_device *dev, 308 struct cfg80211_internal_bss *res) 309 { 310 struct rb_node *n = dev->bss_tree.rb_node; 311 struct cfg80211_internal_bss *bss; 312 int r; 313 314 while (n) { 315 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 316 r = cmp_bss(&res->pub, &bss->pub); 317 318 if (r == 0) 319 return bss; 320 else if (r < 0) 321 n = n->rb_left; 322 else 323 n = n->rb_right; 324 } 325 326 return NULL; 327 } 328 329 static struct cfg80211_internal_bss * 330 cfg80211_bss_update(struct cfg80211_registered_device *dev, 331 struct cfg80211_internal_bss *res, 332 bool overwrite) 333 { 334 struct cfg80211_internal_bss *found = NULL; 335 const u8 *meshid, *meshcfg; 336 337 /* 338 * The reference to "res" is donated to this function. 339 */ 340 341 if (WARN_ON(!res->pub.channel)) { 342 kref_put(&res->ref, bss_release); 343 return NULL; 344 } 345 346 res->ts = jiffies; 347 348 if (is_zero_ether_addr(res->pub.bssid)) { 349 /* must be mesh, verify */ 350 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 351 res->pub.len_information_elements); 352 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 353 res->pub.information_elements, 354 res->pub.len_information_elements); 355 if (!meshid || !meshcfg || 356 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 357 /* bogus mesh */ 358 kref_put(&res->ref, bss_release); 359 return NULL; 360 } 361 } 362 363 spin_lock_bh(&dev->bss_lock); 364 365 found = rb_find_bss(dev, res); 366 367 if (found) { 368 found->pub.beacon_interval = res->pub.beacon_interval; 369 found->pub.tsf = res->pub.tsf; 370 found->pub.signal = res->pub.signal; 371 found->pub.capability = res->pub.capability; 372 found->ts = res->ts; 373 374 /* overwrite IEs */ 375 if (overwrite) { 376 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 377 size_t ielen = res->pub.len_information_elements; 378 379 if (!found->ies_allocated && ksize(found) >= used + ielen) { 380 memcpy(found->pub.information_elements, 381 res->pub.information_elements, ielen); 382 found->pub.len_information_elements = ielen; 383 } else { 384 u8 *ies = found->pub.information_elements; 385 386 if (found->ies_allocated) 387 ies = krealloc(ies, ielen, GFP_ATOMIC); 388 else 389 ies = kmalloc(ielen, GFP_ATOMIC); 390 391 if (ies) { 392 memcpy(ies, res->pub.information_elements, ielen); 393 found->ies_allocated = true; 394 found->pub.information_elements = ies; 395 found->pub.len_information_elements = ielen; 396 } 397 } 398 } 399 400 kref_put(&res->ref, bss_release); 401 } else { 402 /* this "consumes" the reference */ 403 list_add_tail(&res->list, &dev->bss_list); 404 rb_insert_bss(dev, res); 405 found = res; 406 } 407 408 dev->bss_generation++; 409 spin_unlock_bh(&dev->bss_lock); 410 411 kref_get(&found->ref); 412 return found; 413 } 414 415 struct cfg80211_bss* 416 cfg80211_inform_bss(struct wiphy *wiphy, 417 struct ieee80211_channel *channel, 418 const u8 *bssid, 419 u64 timestamp, u16 capability, u16 beacon_interval, 420 const u8 *ie, size_t ielen, 421 s32 signal, gfp_t gfp) 422 { 423 struct cfg80211_internal_bss *res; 424 size_t privsz; 425 426 if (WARN_ON(!wiphy)) 427 return NULL; 428 429 privsz = wiphy->bss_priv_size; 430 431 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 432 (signal < 0 || signal > 100))) 433 return NULL; 434 435 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 436 if (!res) 437 return NULL; 438 439 memcpy(res->pub.bssid, bssid, ETH_ALEN); 440 res->pub.channel = channel; 441 res->pub.signal = signal; 442 res->pub.tsf = timestamp; 443 res->pub.beacon_interval = beacon_interval; 444 res->pub.capability = capability; 445 /* point to after the private area */ 446 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 447 memcpy(res->pub.information_elements, ie, ielen); 448 res->pub.len_information_elements = ielen; 449 450 kref_init(&res->ref); 451 452 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); 453 if (!res) 454 return NULL; 455 456 if (res->pub.capability & WLAN_CAPABILITY_ESS) 457 regulatory_hint_found_beacon(wiphy, channel, gfp); 458 459 /* cfg80211_bss_update gives us a referenced result */ 460 return &res->pub; 461 } 462 EXPORT_SYMBOL(cfg80211_inform_bss); 463 464 struct cfg80211_bss * 465 cfg80211_inform_bss_frame(struct wiphy *wiphy, 466 struct ieee80211_channel *channel, 467 struct ieee80211_mgmt *mgmt, size_t len, 468 s32 signal, gfp_t gfp) 469 { 470 struct cfg80211_internal_bss *res; 471 size_t ielen = len - offsetof(struct ieee80211_mgmt, 472 u.probe_resp.variable); 473 bool overwrite; 474 size_t privsz = wiphy->bss_priv_size; 475 476 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 477 (signal < 0 || signal > 100))) 478 return NULL; 479 480 if (WARN_ON(!mgmt || !wiphy || 481 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 482 return NULL; 483 484 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 485 if (!res) 486 return NULL; 487 488 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 489 res->pub.channel = channel; 490 res->pub.signal = signal; 491 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 492 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 493 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 494 /* point to after the private area */ 495 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 496 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 497 res->pub.len_information_elements = ielen; 498 499 kref_init(&res->ref); 500 501 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 502 503 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 504 if (!res) 505 return NULL; 506 507 if (res->pub.capability & WLAN_CAPABILITY_ESS) 508 regulatory_hint_found_beacon(wiphy, channel, gfp); 509 510 /* cfg80211_bss_update gives us a referenced result */ 511 return &res->pub; 512 } 513 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 514 515 void cfg80211_put_bss(struct cfg80211_bss *pub) 516 { 517 struct cfg80211_internal_bss *bss; 518 519 if (!pub) 520 return; 521 522 bss = container_of(pub, struct cfg80211_internal_bss, pub); 523 kref_put(&bss->ref, bss_release); 524 } 525 EXPORT_SYMBOL(cfg80211_put_bss); 526 527 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 528 { 529 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 530 struct cfg80211_internal_bss *bss; 531 532 if (WARN_ON(!pub)) 533 return; 534 535 bss = container_of(pub, struct cfg80211_internal_bss, pub); 536 537 spin_lock_bh(&dev->bss_lock); 538 539 list_del(&bss->list); 540 rb_erase(&bss->rbn, &dev->bss_tree); 541 542 spin_unlock_bh(&dev->bss_lock); 543 544 kref_put(&bss->ref, bss_release); 545 } 546 EXPORT_SYMBOL(cfg80211_unlink_bss); 547 548 void cfg80211_hold_bss(struct cfg80211_bss *pub) 549 { 550 struct cfg80211_internal_bss *bss; 551 552 if (!pub) 553 return; 554 555 bss = container_of(pub, struct cfg80211_internal_bss, pub); 556 bss->hold = true; 557 } 558 EXPORT_SYMBOL(cfg80211_hold_bss); 559 560 void cfg80211_unhold_bss(struct cfg80211_bss *pub) 561 { 562 struct cfg80211_internal_bss *bss; 563 564 if (!pub) 565 return; 566 567 bss = container_of(pub, struct cfg80211_internal_bss, pub); 568 bss->hold = false; 569 } 570 EXPORT_SYMBOL(cfg80211_unhold_bss); 571 572 #ifdef CONFIG_WIRELESS_EXT 573 int cfg80211_wext_siwscan(struct net_device *dev, 574 struct iw_request_info *info, 575 union iwreq_data *wrqu, char *extra) 576 { 577 struct cfg80211_registered_device *rdev; 578 struct wiphy *wiphy; 579 struct iw_scan_req *wreq = NULL; 580 struct cfg80211_scan_request *creq; 581 int i, err, n_channels = 0; 582 enum ieee80211_band band; 583 584 if (!netif_running(dev)) 585 return -ENETDOWN; 586 587 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 588 589 if (IS_ERR(rdev)) 590 return PTR_ERR(rdev); 591 592 if (rdev->scan_req) { 593 err = -EBUSY; 594 goto out; 595 } 596 597 wiphy = &rdev->wiphy; 598 599 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 600 if (wiphy->bands[band]) 601 n_channels += wiphy->bands[band]->n_channels; 602 603 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 604 n_channels * sizeof(void *), 605 GFP_ATOMIC); 606 if (!creq) { 607 err = -ENOMEM; 608 goto out; 609 } 610 611 creq->wiphy = wiphy; 612 creq->ifidx = dev->ifindex; 613 creq->ssids = (void *)(creq + 1); 614 creq->channels = (void *)(creq->ssids + 1); 615 creq->n_channels = n_channels; 616 creq->n_ssids = 1; 617 618 /* all channels */ 619 i = 0; 620 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 621 int j; 622 if (!wiphy->bands[band]) 623 continue; 624 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 625 creq->channels[i] = &wiphy->bands[band]->channels[j]; 626 i++; 627 } 628 } 629 630 /* translate scan request */ 631 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 632 wreq = (struct iw_scan_req *)extra; 633 634 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 635 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 636 return -EINVAL; 637 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 638 creq->ssids[0].ssid_len = wreq->essid_len; 639 } 640 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 641 creq->n_ssids = 0; 642 } 643 644 rdev->scan_req = creq; 645 err = rdev->ops->scan(wiphy, dev, creq); 646 if (err) { 647 rdev->scan_req = NULL; 648 kfree(creq); 649 } 650 out: 651 cfg80211_put_dev(rdev); 652 return err; 653 } 654 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 655 656 static void ieee80211_scan_add_ies(struct iw_request_info *info, 657 struct cfg80211_bss *bss, 658 char **current_ev, char *end_buf) 659 { 660 u8 *pos, *end, *next; 661 struct iw_event iwe; 662 663 if (!bss->information_elements || 664 !bss->len_information_elements) 665 return; 666 667 /* 668 * If needed, fragment the IEs buffer (at IE boundaries) into short 669 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 670 */ 671 pos = bss->information_elements; 672 end = pos + bss->len_information_elements; 673 674 while (end - pos > IW_GENERIC_IE_MAX) { 675 next = pos + 2 + pos[1]; 676 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 677 next = next + 2 + next[1]; 678 679 memset(&iwe, 0, sizeof(iwe)); 680 iwe.cmd = IWEVGENIE; 681 iwe.u.data.length = next - pos; 682 *current_ev = iwe_stream_add_point(info, *current_ev, 683 end_buf, &iwe, pos); 684 685 pos = next; 686 } 687 688 if (end > pos) { 689 memset(&iwe, 0, sizeof(iwe)); 690 iwe.cmd = IWEVGENIE; 691 iwe.u.data.length = end - pos; 692 *current_ev = iwe_stream_add_point(info, *current_ev, 693 end_buf, &iwe, pos); 694 } 695 } 696 697 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 698 { 699 unsigned long end = jiffies; 700 701 if (end >= start) 702 return jiffies_to_msecs(end - start); 703 704 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 705 } 706 707 static char * 708 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 709 struct cfg80211_internal_bss *bss, char *current_ev, 710 char *end_buf) 711 { 712 struct iw_event iwe; 713 u8 *buf, *cfg, *p; 714 u8 *ie = bss->pub.information_elements; 715 int rem = bss->pub.len_information_elements, i, sig; 716 bool ismesh = false; 717 718 memset(&iwe, 0, sizeof(iwe)); 719 iwe.cmd = SIOCGIWAP; 720 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 721 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 722 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 723 IW_EV_ADDR_LEN); 724 725 memset(&iwe, 0, sizeof(iwe)); 726 iwe.cmd = SIOCGIWFREQ; 727 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 728 iwe.u.freq.e = 0; 729 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 730 IW_EV_FREQ_LEN); 731 732 memset(&iwe, 0, sizeof(iwe)); 733 iwe.cmd = SIOCGIWFREQ; 734 iwe.u.freq.m = bss->pub.channel->center_freq; 735 iwe.u.freq.e = 6; 736 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 737 IW_EV_FREQ_LEN); 738 739 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 740 memset(&iwe, 0, sizeof(iwe)); 741 iwe.cmd = IWEVQUAL; 742 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 743 IW_QUAL_NOISE_INVALID | 744 IW_QUAL_QUAL_UPDATED; 745 switch (wiphy->signal_type) { 746 case CFG80211_SIGNAL_TYPE_MBM: 747 sig = bss->pub.signal / 100; 748 iwe.u.qual.level = sig; 749 iwe.u.qual.updated |= IW_QUAL_DBM; 750 if (sig < -110) /* rather bad */ 751 sig = -110; 752 else if (sig > -40) /* perfect */ 753 sig = -40; 754 /* will give a range of 0 .. 70 */ 755 iwe.u.qual.qual = sig + 110; 756 break; 757 case CFG80211_SIGNAL_TYPE_UNSPEC: 758 iwe.u.qual.level = bss->pub.signal; 759 /* will give range 0 .. 100 */ 760 iwe.u.qual.qual = bss->pub.signal; 761 break; 762 default: 763 /* not reached */ 764 break; 765 } 766 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 767 &iwe, IW_EV_QUAL_LEN); 768 } 769 770 memset(&iwe, 0, sizeof(iwe)); 771 iwe.cmd = SIOCGIWENCODE; 772 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 773 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 774 else 775 iwe.u.data.flags = IW_ENCODE_DISABLED; 776 iwe.u.data.length = 0; 777 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 778 &iwe, ""); 779 780 while (rem >= 2) { 781 /* invalid data */ 782 if (ie[1] > rem - 2) 783 break; 784 785 switch (ie[0]) { 786 case WLAN_EID_SSID: 787 memset(&iwe, 0, sizeof(iwe)); 788 iwe.cmd = SIOCGIWESSID; 789 iwe.u.data.length = ie[1]; 790 iwe.u.data.flags = 1; 791 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 792 &iwe, ie + 2); 793 break; 794 case WLAN_EID_MESH_ID: 795 memset(&iwe, 0, sizeof(iwe)); 796 iwe.cmd = SIOCGIWESSID; 797 iwe.u.data.length = ie[1]; 798 iwe.u.data.flags = 1; 799 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 800 &iwe, ie + 2); 801 break; 802 case WLAN_EID_MESH_CONFIG: 803 ismesh = true; 804 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 805 break; 806 buf = kmalloc(50, GFP_ATOMIC); 807 if (!buf) 808 break; 809 cfg = ie + 2; 810 memset(&iwe, 0, sizeof(iwe)); 811 iwe.cmd = IWEVCUSTOM; 812 sprintf(buf, "Mesh network (version %d)", cfg[0]); 813 iwe.u.data.length = strlen(buf); 814 current_ev = iwe_stream_add_point(info, current_ev, 815 end_buf, 816 &iwe, buf); 817 sprintf(buf, "Path Selection Protocol ID: " 818 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 819 cfg[4]); 820 iwe.u.data.length = strlen(buf); 821 current_ev = iwe_stream_add_point(info, current_ev, 822 end_buf, 823 &iwe, buf); 824 sprintf(buf, "Path Selection Metric ID: " 825 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 826 cfg[8]); 827 iwe.u.data.length = strlen(buf); 828 current_ev = iwe_stream_add_point(info, current_ev, 829 end_buf, 830 &iwe, buf); 831 sprintf(buf, "Congestion Control Mode ID: " 832 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 833 cfg[11], cfg[12]); 834 iwe.u.data.length = strlen(buf); 835 current_ev = iwe_stream_add_point(info, current_ev, 836 end_buf, 837 &iwe, buf); 838 sprintf(buf, "Channel Precedence: " 839 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 840 cfg[15], cfg[16]); 841 iwe.u.data.length = strlen(buf); 842 current_ev = iwe_stream_add_point(info, current_ev, 843 end_buf, 844 &iwe, buf); 845 kfree(buf); 846 break; 847 case WLAN_EID_SUPP_RATES: 848 case WLAN_EID_EXT_SUPP_RATES: 849 /* display all supported rates in readable format */ 850 p = current_ev + iwe_stream_lcp_len(info); 851 852 memset(&iwe, 0, sizeof(iwe)); 853 iwe.cmd = SIOCGIWRATE; 854 /* Those two flags are ignored... */ 855 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 856 857 for (i = 0; i < ie[1]; i++) { 858 iwe.u.bitrate.value = 859 ((ie[i + 2] & 0x7f) * 500000); 860 p = iwe_stream_add_value(info, current_ev, p, 861 end_buf, &iwe, IW_EV_PARAM_LEN); 862 } 863 current_ev = p; 864 break; 865 } 866 rem -= ie[1] + 2; 867 ie += ie[1] + 2; 868 } 869 870 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 871 || ismesh) { 872 memset(&iwe, 0, sizeof(iwe)); 873 iwe.cmd = SIOCGIWMODE; 874 if (ismesh) 875 iwe.u.mode = IW_MODE_MESH; 876 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 877 iwe.u.mode = IW_MODE_MASTER; 878 else 879 iwe.u.mode = IW_MODE_ADHOC; 880 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 881 &iwe, IW_EV_UINT_LEN); 882 } 883 884 buf = kmalloc(30, GFP_ATOMIC); 885 if (buf) { 886 memset(&iwe, 0, sizeof(iwe)); 887 iwe.cmd = IWEVCUSTOM; 888 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 889 iwe.u.data.length = strlen(buf); 890 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 891 &iwe, buf); 892 memset(&iwe, 0, sizeof(iwe)); 893 iwe.cmd = IWEVCUSTOM; 894 sprintf(buf, " Last beacon: %ums ago", 895 elapsed_jiffies_msecs(bss->ts)); 896 iwe.u.data.length = strlen(buf); 897 current_ev = iwe_stream_add_point(info, current_ev, 898 end_buf, &iwe, buf); 899 kfree(buf); 900 } 901 902 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 903 904 return current_ev; 905 } 906 907 908 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 909 struct iw_request_info *info, 910 char *buf, size_t len) 911 { 912 char *current_ev = buf; 913 char *end_buf = buf + len; 914 struct cfg80211_internal_bss *bss; 915 916 spin_lock_bh(&dev->bss_lock); 917 cfg80211_bss_expire(dev); 918 919 list_for_each_entry(bss, &dev->bss_list, list) { 920 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 921 spin_unlock_bh(&dev->bss_lock); 922 return -E2BIG; 923 } 924 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 925 current_ev, end_buf); 926 } 927 spin_unlock_bh(&dev->bss_lock); 928 return current_ev - buf; 929 } 930 931 932 int cfg80211_wext_giwscan(struct net_device *dev, 933 struct iw_request_info *info, 934 struct iw_point *data, char *extra) 935 { 936 struct cfg80211_registered_device *rdev; 937 int res; 938 939 if (!netif_running(dev)) 940 return -ENETDOWN; 941 942 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 943 944 if (IS_ERR(rdev)) 945 return PTR_ERR(rdev); 946 947 if (rdev->scan_req) { 948 res = -EAGAIN; 949 goto out; 950 } 951 952 res = ieee80211_scan_results(rdev, info, extra, data->length); 953 data->length = 0; 954 if (res >= 0) { 955 data->length = res; 956 res = 0; 957 } 958 959 out: 960 cfg80211_put_dev(rdev); 961 return res; 962 } 963 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 964 #endif 965