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 wiphy_to_dev(request->wiphy)->scan_req = NULL; 39 40 #ifdef CONFIG_WIRELESS_EXT 41 if (!aborted) { 42 memset(&wrqu, 0, sizeof(wrqu)); 43 44 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 45 } 46 #endif 47 48 dev_put(dev); 49 50 out: 51 kfree(request); 52 } 53 EXPORT_SYMBOL(cfg80211_scan_done); 54 55 static void bss_release(struct kref *ref) 56 { 57 struct cfg80211_internal_bss *bss; 58 59 bss = container_of(ref, struct cfg80211_internal_bss, ref); 60 if (bss->pub.free_priv) 61 bss->pub.free_priv(&bss->pub); 62 63 if (bss->ies_allocated) 64 kfree(bss->pub.information_elements); 65 66 kfree(bss); 67 } 68 69 /* must hold dev->bss_lock! */ 70 void cfg80211_bss_age(struct cfg80211_registered_device *dev, 71 unsigned long age_secs) 72 { 73 struct cfg80211_internal_bss *bss; 74 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 75 76 list_for_each_entry(bss, &dev->bss_list, list) { 77 bss->ts -= age_jiffies; 78 } 79 } 80 81 /* must hold dev->bss_lock! */ 82 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 83 { 84 struct cfg80211_internal_bss *bss, *tmp; 85 bool expired = false; 86 87 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 88 if (bss->hold || 89 !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 90 continue; 91 list_del(&bss->list); 92 rb_erase(&bss->rbn, &dev->bss_tree); 93 kref_put(&bss->ref, bss_release); 94 expired = true; 95 } 96 97 if (expired) 98 dev->bss_generation++; 99 } 100 101 static u8 *find_ie(u8 num, u8 *ies, size_t len) 102 { 103 while (len > 2 && ies[0] != num) { 104 len -= ies[1] + 2; 105 ies += ies[1] + 2; 106 } 107 if (len < 2) 108 return NULL; 109 if (len < 2 + ies[1]) 110 return NULL; 111 return ies; 112 } 113 114 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 115 { 116 const u8 *ie1 = find_ie(num, ies1, len1); 117 const u8 *ie2 = find_ie(num, ies2, len2); 118 int r; 119 120 if (!ie1 && !ie2) 121 return 0; 122 if (!ie1) 123 return -1; 124 125 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 126 if (r == 0 && ie1[1] != ie2[1]) 127 return ie2[1] - ie1[1]; 128 return r; 129 } 130 131 static bool is_bss(struct cfg80211_bss *a, 132 const u8 *bssid, 133 const u8 *ssid, size_t ssid_len) 134 { 135 const u8 *ssidie; 136 137 if (bssid && compare_ether_addr(a->bssid, bssid)) 138 return false; 139 140 if (!ssid) 141 return true; 142 143 ssidie = find_ie(WLAN_EID_SSID, 144 a->information_elements, 145 a->len_information_elements); 146 if (!ssidie) 147 return false; 148 if (ssidie[1] != ssid_len) 149 return false; 150 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 151 } 152 153 static bool is_mesh(struct cfg80211_bss *a, 154 const u8 *meshid, size_t meshidlen, 155 const u8 *meshcfg) 156 { 157 const u8 *ie; 158 159 if (!is_zero_ether_addr(a->bssid)) 160 return false; 161 162 ie = find_ie(WLAN_EID_MESH_ID, 163 a->information_elements, 164 a->len_information_elements); 165 if (!ie) 166 return false; 167 if (ie[1] != meshidlen) 168 return false; 169 if (memcmp(ie + 2, meshid, meshidlen)) 170 return false; 171 172 ie = find_ie(WLAN_EID_MESH_CONFIG, 173 a->information_elements, 174 a->len_information_elements); 175 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 176 return false; 177 178 /* 179 * Ignore mesh capability (last two bytes of the IE) when 180 * comparing since that may differ between stations taking 181 * part in the same mesh. 182 */ 183 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 184 } 185 186 static int cmp_bss(struct cfg80211_bss *a, 187 struct cfg80211_bss *b) 188 { 189 int r; 190 191 if (a->channel != b->channel) 192 return b->channel->center_freq - a->channel->center_freq; 193 194 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 195 if (r) 196 return r; 197 198 if (is_zero_ether_addr(a->bssid)) { 199 r = cmp_ies(WLAN_EID_MESH_ID, 200 a->information_elements, 201 a->len_information_elements, 202 b->information_elements, 203 b->len_information_elements); 204 if (r) 205 return r; 206 return cmp_ies(WLAN_EID_MESH_CONFIG, 207 a->information_elements, 208 a->len_information_elements, 209 b->information_elements, 210 b->len_information_elements); 211 } 212 213 return cmp_ies(WLAN_EID_SSID, 214 a->information_elements, 215 a->len_information_elements, 216 b->information_elements, 217 b->len_information_elements); 218 } 219 220 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 221 struct ieee80211_channel *channel, 222 const u8 *bssid, 223 const u8 *ssid, size_t ssid_len, 224 u16 capa_mask, u16 capa_val) 225 { 226 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 227 struct cfg80211_internal_bss *bss, *res = NULL; 228 229 spin_lock_bh(&dev->bss_lock); 230 231 list_for_each_entry(bss, &dev->bss_list, list) { 232 if ((bss->pub.capability & capa_mask) != capa_val) 233 continue; 234 if (channel && bss->pub.channel != channel) 235 continue; 236 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 237 res = bss; 238 kref_get(&res->ref); 239 break; 240 } 241 } 242 243 spin_unlock_bh(&dev->bss_lock); 244 if (!res) 245 return NULL; 246 return &res->pub; 247 } 248 EXPORT_SYMBOL(cfg80211_get_bss); 249 250 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 251 struct ieee80211_channel *channel, 252 const u8 *meshid, size_t meshidlen, 253 const u8 *meshcfg) 254 { 255 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 256 struct cfg80211_internal_bss *bss, *res = NULL; 257 258 spin_lock_bh(&dev->bss_lock); 259 260 list_for_each_entry(bss, &dev->bss_list, list) { 261 if (channel && bss->pub.channel != channel) 262 continue; 263 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 264 res = bss; 265 kref_get(&res->ref); 266 break; 267 } 268 } 269 270 spin_unlock_bh(&dev->bss_lock); 271 if (!res) 272 return NULL; 273 return &res->pub; 274 } 275 EXPORT_SYMBOL(cfg80211_get_mesh); 276 277 278 static void rb_insert_bss(struct cfg80211_registered_device *dev, 279 struct cfg80211_internal_bss *bss) 280 { 281 struct rb_node **p = &dev->bss_tree.rb_node; 282 struct rb_node *parent = NULL; 283 struct cfg80211_internal_bss *tbss; 284 int cmp; 285 286 while (*p) { 287 parent = *p; 288 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 289 290 cmp = cmp_bss(&bss->pub, &tbss->pub); 291 292 if (WARN_ON(!cmp)) { 293 /* will sort of leak this BSS */ 294 return; 295 } 296 297 if (cmp < 0) 298 p = &(*p)->rb_left; 299 else 300 p = &(*p)->rb_right; 301 } 302 303 rb_link_node(&bss->rbn, parent, p); 304 rb_insert_color(&bss->rbn, &dev->bss_tree); 305 } 306 307 static struct cfg80211_internal_bss * 308 rb_find_bss(struct cfg80211_registered_device *dev, 309 struct cfg80211_internal_bss *res) 310 { 311 struct rb_node *n = dev->bss_tree.rb_node; 312 struct cfg80211_internal_bss *bss; 313 int r; 314 315 while (n) { 316 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 317 r = cmp_bss(&res->pub, &bss->pub); 318 319 if (r == 0) 320 return bss; 321 else if (r < 0) 322 n = n->rb_left; 323 else 324 n = n->rb_right; 325 } 326 327 return NULL; 328 } 329 330 static struct cfg80211_internal_bss * 331 cfg80211_bss_update(struct cfg80211_registered_device *dev, 332 struct cfg80211_internal_bss *res, 333 bool overwrite) 334 { 335 struct cfg80211_internal_bss *found = NULL; 336 const u8 *meshid, *meshcfg; 337 338 /* 339 * The reference to "res" is donated to this function. 340 */ 341 342 if (WARN_ON(!res->pub.channel)) { 343 kref_put(&res->ref, bss_release); 344 return NULL; 345 } 346 347 res->ts = jiffies; 348 349 if (is_zero_ether_addr(res->pub.bssid)) { 350 /* must be mesh, verify */ 351 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 352 res->pub.len_information_elements); 353 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 354 res->pub.information_elements, 355 res->pub.len_information_elements); 356 if (!meshid || !meshcfg || 357 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 358 /* bogus mesh */ 359 kref_put(&res->ref, bss_release); 360 return NULL; 361 } 362 } 363 364 spin_lock_bh(&dev->bss_lock); 365 366 found = rb_find_bss(dev, res); 367 368 if (found) { 369 found->pub.beacon_interval = res->pub.beacon_interval; 370 found->pub.tsf = res->pub.tsf; 371 found->pub.signal = res->pub.signal; 372 found->pub.capability = res->pub.capability; 373 found->ts = res->ts; 374 375 /* overwrite IEs */ 376 if (overwrite) { 377 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 378 size_t ielen = res->pub.len_information_elements; 379 380 if (!found->ies_allocated && ksize(found) >= used + ielen) { 381 memcpy(found->pub.information_elements, 382 res->pub.information_elements, ielen); 383 found->pub.len_information_elements = ielen; 384 } else { 385 u8 *ies = found->pub.information_elements; 386 387 if (found->ies_allocated) 388 ies = krealloc(ies, ielen, GFP_ATOMIC); 389 else 390 ies = kmalloc(ielen, GFP_ATOMIC); 391 392 if (ies) { 393 memcpy(ies, res->pub.information_elements, ielen); 394 found->ies_allocated = true; 395 found->pub.information_elements = ies; 396 found->pub.len_information_elements = ielen; 397 } 398 } 399 } 400 401 kref_put(&res->ref, bss_release); 402 } else { 403 /* this "consumes" the reference */ 404 list_add_tail(&res->list, &dev->bss_list); 405 rb_insert_bss(dev, res); 406 found = res; 407 } 408 409 dev->bss_generation++; 410 spin_unlock_bh(&dev->bss_lock); 411 412 kref_get(&found->ref); 413 return found; 414 } 415 416 struct cfg80211_bss* 417 cfg80211_inform_bss(struct wiphy *wiphy, 418 struct ieee80211_channel *channel, 419 const u8 *bssid, 420 u64 timestamp, u16 capability, u16 beacon_interval, 421 const u8 *ie, size_t ielen, 422 s32 signal, gfp_t gfp) 423 { 424 struct cfg80211_internal_bss *res; 425 size_t privsz; 426 427 if (WARN_ON(!wiphy)) 428 return NULL; 429 430 privsz = wiphy->bss_priv_size; 431 432 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 433 (signal < 0 || signal > 100))) 434 return NULL; 435 436 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 437 if (!res) 438 return NULL; 439 440 memcpy(res->pub.bssid, bssid, ETH_ALEN); 441 res->pub.channel = channel; 442 res->pub.signal = signal; 443 res->pub.tsf = timestamp; 444 res->pub.beacon_interval = beacon_interval; 445 res->pub.capability = capability; 446 /* point to after the private area */ 447 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 448 memcpy(res->pub.information_elements, ie, ielen); 449 res->pub.len_information_elements = ielen; 450 451 kref_init(&res->ref); 452 453 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); 454 if (!res) 455 return NULL; 456 457 if (res->pub.capability & WLAN_CAPABILITY_ESS) 458 regulatory_hint_found_beacon(wiphy, channel, gfp); 459 460 /* cfg80211_bss_update gives us a referenced result */ 461 return &res->pub; 462 } 463 EXPORT_SYMBOL(cfg80211_inform_bss); 464 465 struct cfg80211_bss * 466 cfg80211_inform_bss_frame(struct wiphy *wiphy, 467 struct ieee80211_channel *channel, 468 struct ieee80211_mgmt *mgmt, size_t len, 469 s32 signal, gfp_t gfp) 470 { 471 struct cfg80211_internal_bss *res; 472 size_t ielen = len - offsetof(struct ieee80211_mgmt, 473 u.probe_resp.variable); 474 bool overwrite; 475 size_t 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 if (WARN_ON(!mgmt || !wiphy || 482 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 483 return NULL; 484 485 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 486 if (!res) 487 return NULL; 488 489 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 490 res->pub.channel = channel; 491 res->pub.signal = signal; 492 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 493 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 494 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 495 /* point to after the private area */ 496 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 497 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 498 res->pub.len_information_elements = ielen; 499 500 kref_init(&res->ref); 501 502 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 503 504 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 505 if (!res) 506 return NULL; 507 508 if (res->pub.capability & WLAN_CAPABILITY_ESS) 509 regulatory_hint_found_beacon(wiphy, channel, gfp); 510 511 /* cfg80211_bss_update gives us a referenced result */ 512 return &res->pub; 513 } 514 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 515 516 void cfg80211_put_bss(struct cfg80211_bss *pub) 517 { 518 struct cfg80211_internal_bss *bss; 519 520 if (!pub) 521 return; 522 523 bss = container_of(pub, struct cfg80211_internal_bss, pub); 524 kref_put(&bss->ref, bss_release); 525 } 526 EXPORT_SYMBOL(cfg80211_put_bss); 527 528 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 529 { 530 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 531 struct cfg80211_internal_bss *bss; 532 533 if (WARN_ON(!pub)) 534 return; 535 536 bss = container_of(pub, struct cfg80211_internal_bss, pub); 537 538 spin_lock_bh(&dev->bss_lock); 539 540 list_del(&bss->list); 541 rb_erase(&bss->rbn, &dev->bss_tree); 542 543 spin_unlock_bh(&dev->bss_lock); 544 545 kref_put(&bss->ref, bss_release); 546 } 547 EXPORT_SYMBOL(cfg80211_unlink_bss); 548 549 void cfg80211_hold_bss(struct cfg80211_bss *pub) 550 { 551 struct cfg80211_internal_bss *bss; 552 553 if (!pub) 554 return; 555 556 bss = container_of(pub, struct cfg80211_internal_bss, pub); 557 bss->hold = true; 558 } 559 EXPORT_SYMBOL(cfg80211_hold_bss); 560 561 void cfg80211_unhold_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 bss->hold = false; 570 } 571 EXPORT_SYMBOL(cfg80211_unhold_bss); 572 573 #ifdef CONFIG_WIRELESS_EXT 574 int cfg80211_wext_siwscan(struct net_device *dev, 575 struct iw_request_info *info, 576 union iwreq_data *wrqu, char *extra) 577 { 578 struct cfg80211_registered_device *rdev; 579 struct wiphy *wiphy; 580 struct iw_scan_req *wreq = NULL; 581 struct cfg80211_scan_request *creq; 582 int i, err, n_channels = 0; 583 enum ieee80211_band band; 584 585 if (!netif_running(dev)) 586 return -ENETDOWN; 587 588 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 589 590 if (IS_ERR(rdev)) 591 return PTR_ERR(rdev); 592 593 if (rdev->scan_req) { 594 err = -EBUSY; 595 goto out; 596 } 597 598 wiphy = &rdev->wiphy; 599 600 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 601 if (wiphy->bands[band]) 602 n_channels += wiphy->bands[band]->n_channels; 603 604 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 605 n_channels * sizeof(void *), 606 GFP_ATOMIC); 607 if (!creq) { 608 err = -ENOMEM; 609 goto out; 610 } 611 612 creq->wiphy = wiphy; 613 creq->ifidx = dev->ifindex; 614 creq->ssids = (void *)(creq + 1); 615 creq->channels = (void *)(creq->ssids + 1); 616 creq->n_channels = n_channels; 617 creq->n_ssids = 1; 618 619 /* all channels */ 620 i = 0; 621 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 622 int j; 623 if (!wiphy->bands[band]) 624 continue; 625 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 626 creq->channels[i] = &wiphy->bands[band]->channels[j]; 627 i++; 628 } 629 } 630 631 /* translate scan request */ 632 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 633 wreq = (struct iw_scan_req *)extra; 634 635 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 636 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 637 return -EINVAL; 638 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 639 creq->ssids[0].ssid_len = wreq->essid_len; 640 } 641 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 642 creq->n_ssids = 0; 643 } 644 645 rdev->scan_req = creq; 646 err = rdev->ops->scan(wiphy, dev, creq); 647 if (err) { 648 rdev->scan_req = NULL; 649 kfree(creq); 650 } 651 out: 652 cfg80211_put_dev(rdev); 653 return err; 654 } 655 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 656 657 static 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 } 697 698 static 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 } 707 708 static char * 709 ieee80211_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 } 907 908 909 static 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 } 931 932 933 int 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->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_put_dev(rdev); 962 return res; 963 } 964 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 965 #endif 966