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 wiphy_to_dev(request->wiphy)->scan_req = NULL; 33 34 if (aborted) 35 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); 36 else 37 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); 38 39 #ifdef CONFIG_WIRELESS_EXT 40 if (!aborted) { 41 memset(&wrqu, 0, sizeof(wrqu)); 42 43 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 44 } 45 #endif 46 47 dev_put(dev); 48 49 out: 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 kref_get(&found->ref); 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 (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 if (ksize(ies) < ielen) 389 ies = krealloc(ies, ielen, 390 GFP_ATOMIC); 391 } else 392 ies = kmalloc(ielen, GFP_ATOMIC); 393 394 if (ies) { 395 memcpy(ies, res->pub.information_elements, ielen); 396 found->ies_allocated = true; 397 found->pub.information_elements = ies; 398 } 399 } 400 } 401 402 kref_put(&res->ref, bss_release); 403 } else { 404 /* this "consumes" the reference */ 405 list_add_tail(&res->list, &dev->bss_list); 406 rb_insert_bss(dev, res); 407 found = res; 408 } 409 410 dev->bss_generation++; 411 spin_unlock_bh(&dev->bss_lock); 412 413 kref_get(&found->ref); 414 return found; 415 } 416 417 struct cfg80211_bss * 418 cfg80211_inform_bss_frame(struct wiphy *wiphy, 419 struct ieee80211_channel *channel, 420 struct ieee80211_mgmt *mgmt, size_t len, 421 s32 signal, gfp_t gfp) 422 { 423 struct cfg80211_internal_bss *res; 424 size_t ielen = len - offsetof(struct ieee80211_mgmt, 425 u.probe_resp.variable); 426 bool overwrite; 427 size_t privsz = wiphy->bss_priv_size; 428 429 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 430 (signal < 0 || signal > 100))) 431 return NULL; 432 433 if (WARN_ON(!mgmt || !wiphy || 434 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 435 return NULL; 436 437 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 438 if (!res) 439 return NULL; 440 441 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 442 res->pub.channel = channel; 443 res->pub.signal = signal; 444 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 445 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 446 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 447 /* point to after the private area */ 448 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 449 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 450 res->pub.len_information_elements = ielen; 451 452 kref_init(&res->ref); 453 454 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 455 456 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 457 if (!res) 458 return NULL; 459 460 if (res->pub.capability & WLAN_CAPABILITY_ESS) 461 regulatory_hint_found_beacon(wiphy, channel, gfp); 462 463 /* cfg80211_bss_update gives us a referenced result */ 464 return &res->pub; 465 } 466 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 467 468 void cfg80211_put_bss(struct cfg80211_bss *pub) 469 { 470 struct cfg80211_internal_bss *bss; 471 472 if (!pub) 473 return; 474 475 bss = container_of(pub, struct cfg80211_internal_bss, pub); 476 kref_put(&bss->ref, bss_release); 477 } 478 EXPORT_SYMBOL(cfg80211_put_bss); 479 480 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 481 { 482 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 483 struct cfg80211_internal_bss *bss; 484 485 if (WARN_ON(!pub)) 486 return; 487 488 bss = container_of(pub, struct cfg80211_internal_bss, pub); 489 490 spin_lock_bh(&dev->bss_lock); 491 492 list_del(&bss->list); 493 rb_erase(&bss->rbn, &dev->bss_tree); 494 495 spin_unlock_bh(&dev->bss_lock); 496 497 kref_put(&bss->ref, bss_release); 498 } 499 EXPORT_SYMBOL(cfg80211_unlink_bss); 500 501 void cfg80211_hold_bss(struct cfg80211_bss *pub) 502 { 503 struct cfg80211_internal_bss *bss; 504 505 if (!pub) 506 return; 507 508 bss = container_of(pub, struct cfg80211_internal_bss, pub); 509 bss->hold = true; 510 } 511 EXPORT_SYMBOL(cfg80211_hold_bss); 512 513 void cfg80211_unhold_bss(struct cfg80211_bss *pub) 514 { 515 struct cfg80211_internal_bss *bss; 516 517 if (!pub) 518 return; 519 520 bss = container_of(pub, struct cfg80211_internal_bss, pub); 521 bss->hold = false; 522 } 523 EXPORT_SYMBOL(cfg80211_unhold_bss); 524 525 #ifdef CONFIG_WIRELESS_EXT 526 int cfg80211_wext_siwscan(struct net_device *dev, 527 struct iw_request_info *info, 528 union iwreq_data *wrqu, char *extra) 529 { 530 struct cfg80211_registered_device *rdev; 531 struct wiphy *wiphy; 532 struct iw_scan_req *wreq = NULL; 533 struct cfg80211_scan_request *creq; 534 int i, err, n_channels = 0; 535 enum ieee80211_band band; 536 537 if (!netif_running(dev)) 538 return -ENETDOWN; 539 540 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 541 542 if (IS_ERR(rdev)) 543 return PTR_ERR(rdev); 544 545 if (rdev->scan_req) { 546 err = -EBUSY; 547 goto out; 548 } 549 550 wiphy = &rdev->wiphy; 551 552 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 553 if (wiphy->bands[band]) 554 n_channels += wiphy->bands[band]->n_channels; 555 556 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 557 n_channels * sizeof(void *), 558 GFP_ATOMIC); 559 if (!creq) { 560 err = -ENOMEM; 561 goto out; 562 } 563 564 creq->wiphy = wiphy; 565 creq->ifidx = dev->ifindex; 566 creq->ssids = (void *)(creq + 1); 567 creq->channels = (void *)(creq->ssids + 1); 568 creq->n_channels = n_channels; 569 creq->n_ssids = 1; 570 571 /* all channels */ 572 i = 0; 573 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 574 int j; 575 if (!wiphy->bands[band]) 576 continue; 577 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 578 creq->channels[i] = &wiphy->bands[band]->channels[j]; 579 i++; 580 } 581 } 582 583 /* translate scan request */ 584 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 585 wreq = (struct iw_scan_req *)extra; 586 587 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 588 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 589 return -EINVAL; 590 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 591 creq->ssids[0].ssid_len = wreq->essid_len; 592 } 593 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 594 creq->n_ssids = 0; 595 } 596 597 rdev->scan_req = creq; 598 err = rdev->ops->scan(wiphy, dev, creq); 599 if (err) { 600 rdev->scan_req = NULL; 601 kfree(creq); 602 } 603 out: 604 cfg80211_put_dev(rdev); 605 return err; 606 } 607 EXPORT_SYMBOL(cfg80211_wext_siwscan); 608 609 static void ieee80211_scan_add_ies(struct iw_request_info *info, 610 struct cfg80211_bss *bss, 611 char **current_ev, char *end_buf) 612 { 613 u8 *pos, *end, *next; 614 struct iw_event iwe; 615 616 if (!bss->information_elements || 617 !bss->len_information_elements) 618 return; 619 620 /* 621 * If needed, fragment the IEs buffer (at IE boundaries) into short 622 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 623 */ 624 pos = bss->information_elements; 625 end = pos + bss->len_information_elements; 626 627 while (end - pos > IW_GENERIC_IE_MAX) { 628 next = pos + 2 + pos[1]; 629 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 630 next = next + 2 + next[1]; 631 632 memset(&iwe, 0, sizeof(iwe)); 633 iwe.cmd = IWEVGENIE; 634 iwe.u.data.length = next - pos; 635 *current_ev = iwe_stream_add_point(info, *current_ev, 636 end_buf, &iwe, pos); 637 638 pos = next; 639 } 640 641 if (end > pos) { 642 memset(&iwe, 0, sizeof(iwe)); 643 iwe.cmd = IWEVGENIE; 644 iwe.u.data.length = end - pos; 645 *current_ev = iwe_stream_add_point(info, *current_ev, 646 end_buf, &iwe, pos); 647 } 648 } 649 650 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 651 { 652 unsigned long end = jiffies; 653 654 if (end >= start) 655 return jiffies_to_msecs(end - start); 656 657 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 658 } 659 660 static char * 661 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 662 struct cfg80211_internal_bss *bss, char *current_ev, 663 char *end_buf) 664 { 665 struct iw_event iwe; 666 u8 *buf, *cfg, *p; 667 u8 *ie = bss->pub.information_elements; 668 int rem = bss->pub.len_information_elements, i, sig; 669 bool ismesh = false; 670 671 memset(&iwe, 0, sizeof(iwe)); 672 iwe.cmd = SIOCGIWAP; 673 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 674 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 675 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 676 IW_EV_ADDR_LEN); 677 678 memset(&iwe, 0, sizeof(iwe)); 679 iwe.cmd = SIOCGIWFREQ; 680 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 681 iwe.u.freq.e = 0; 682 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 683 IW_EV_FREQ_LEN); 684 685 memset(&iwe, 0, sizeof(iwe)); 686 iwe.cmd = SIOCGIWFREQ; 687 iwe.u.freq.m = bss->pub.channel->center_freq; 688 iwe.u.freq.e = 6; 689 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 690 IW_EV_FREQ_LEN); 691 692 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 693 memset(&iwe, 0, sizeof(iwe)); 694 iwe.cmd = IWEVQUAL; 695 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 696 IW_QUAL_NOISE_INVALID | 697 IW_QUAL_QUAL_UPDATED; 698 switch (wiphy->signal_type) { 699 case CFG80211_SIGNAL_TYPE_MBM: 700 sig = bss->pub.signal / 100; 701 iwe.u.qual.level = sig; 702 iwe.u.qual.updated |= IW_QUAL_DBM; 703 if (sig < -110) /* rather bad */ 704 sig = -110; 705 else if (sig > -40) /* perfect */ 706 sig = -40; 707 /* will give a range of 0 .. 70 */ 708 iwe.u.qual.qual = sig + 110; 709 break; 710 case CFG80211_SIGNAL_TYPE_UNSPEC: 711 iwe.u.qual.level = bss->pub.signal; 712 /* will give range 0 .. 100 */ 713 iwe.u.qual.qual = bss->pub.signal; 714 break; 715 default: 716 /* not reached */ 717 break; 718 } 719 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 720 &iwe, IW_EV_QUAL_LEN); 721 } 722 723 memset(&iwe, 0, sizeof(iwe)); 724 iwe.cmd = SIOCGIWENCODE; 725 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 726 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 727 else 728 iwe.u.data.flags = IW_ENCODE_DISABLED; 729 iwe.u.data.length = 0; 730 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 731 &iwe, ""); 732 733 while (rem >= 2) { 734 /* invalid data */ 735 if (ie[1] > rem - 2) 736 break; 737 738 switch (ie[0]) { 739 case WLAN_EID_SSID: 740 memset(&iwe, 0, sizeof(iwe)); 741 iwe.cmd = SIOCGIWESSID; 742 iwe.u.data.length = ie[1]; 743 iwe.u.data.flags = 1; 744 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 745 &iwe, ie + 2); 746 break; 747 case WLAN_EID_MESH_ID: 748 memset(&iwe, 0, sizeof(iwe)); 749 iwe.cmd = SIOCGIWESSID; 750 iwe.u.data.length = ie[1]; 751 iwe.u.data.flags = 1; 752 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 753 &iwe, ie + 2); 754 break; 755 case WLAN_EID_MESH_CONFIG: 756 ismesh = true; 757 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 758 break; 759 buf = kmalloc(50, GFP_ATOMIC); 760 if (!buf) 761 break; 762 cfg = ie + 2; 763 memset(&iwe, 0, sizeof(iwe)); 764 iwe.cmd = IWEVCUSTOM; 765 sprintf(buf, "Mesh network (version %d)", cfg[0]); 766 iwe.u.data.length = strlen(buf); 767 current_ev = iwe_stream_add_point(info, current_ev, 768 end_buf, 769 &iwe, buf); 770 sprintf(buf, "Path Selection Protocol ID: " 771 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 772 cfg[4]); 773 iwe.u.data.length = strlen(buf); 774 current_ev = iwe_stream_add_point(info, current_ev, 775 end_buf, 776 &iwe, buf); 777 sprintf(buf, "Path Selection Metric ID: " 778 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 779 cfg[8]); 780 iwe.u.data.length = strlen(buf); 781 current_ev = iwe_stream_add_point(info, current_ev, 782 end_buf, 783 &iwe, buf); 784 sprintf(buf, "Congestion Control Mode ID: " 785 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 786 cfg[11], cfg[12]); 787 iwe.u.data.length = strlen(buf); 788 current_ev = iwe_stream_add_point(info, current_ev, 789 end_buf, 790 &iwe, buf); 791 sprintf(buf, "Channel Precedence: " 792 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 793 cfg[15], cfg[16]); 794 iwe.u.data.length = strlen(buf); 795 current_ev = iwe_stream_add_point(info, current_ev, 796 end_buf, 797 &iwe, buf); 798 kfree(buf); 799 break; 800 case WLAN_EID_SUPP_RATES: 801 case WLAN_EID_EXT_SUPP_RATES: 802 /* display all supported rates in readable format */ 803 p = current_ev + iwe_stream_lcp_len(info); 804 805 memset(&iwe, 0, sizeof(iwe)); 806 iwe.cmd = SIOCGIWRATE; 807 /* Those two flags are ignored... */ 808 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 809 810 for (i = 0; i < ie[1]; i++) { 811 iwe.u.bitrate.value = 812 ((ie[i + 2] & 0x7f) * 500000); 813 p = iwe_stream_add_value(info, current_ev, p, 814 end_buf, &iwe, IW_EV_PARAM_LEN); 815 } 816 current_ev = p; 817 break; 818 } 819 rem -= ie[1] + 2; 820 ie += ie[1] + 2; 821 } 822 823 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 824 || ismesh) { 825 memset(&iwe, 0, sizeof(iwe)); 826 iwe.cmd = SIOCGIWMODE; 827 if (ismesh) 828 iwe.u.mode = IW_MODE_MESH; 829 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 830 iwe.u.mode = IW_MODE_MASTER; 831 else 832 iwe.u.mode = IW_MODE_ADHOC; 833 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 834 &iwe, IW_EV_UINT_LEN); 835 } 836 837 buf = kmalloc(30, GFP_ATOMIC); 838 if (buf) { 839 memset(&iwe, 0, sizeof(iwe)); 840 iwe.cmd = IWEVCUSTOM; 841 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 842 iwe.u.data.length = strlen(buf); 843 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 844 &iwe, buf); 845 memset(&iwe, 0, sizeof(iwe)); 846 iwe.cmd = IWEVCUSTOM; 847 sprintf(buf, " Last beacon: %ums ago", 848 elapsed_jiffies_msecs(bss->ts)); 849 iwe.u.data.length = strlen(buf); 850 current_ev = iwe_stream_add_point(info, current_ev, 851 end_buf, &iwe, buf); 852 kfree(buf); 853 } 854 855 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 856 857 return current_ev; 858 } 859 860 861 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 862 struct iw_request_info *info, 863 char *buf, size_t len) 864 { 865 char *current_ev = buf; 866 char *end_buf = buf + len; 867 struct cfg80211_internal_bss *bss; 868 869 spin_lock_bh(&dev->bss_lock); 870 cfg80211_bss_expire(dev); 871 872 list_for_each_entry(bss, &dev->bss_list, list) { 873 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 874 spin_unlock_bh(&dev->bss_lock); 875 return -E2BIG; 876 } 877 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 878 current_ev, end_buf); 879 } 880 spin_unlock_bh(&dev->bss_lock); 881 return current_ev - buf; 882 } 883 884 885 int cfg80211_wext_giwscan(struct net_device *dev, 886 struct iw_request_info *info, 887 struct iw_point *data, char *extra) 888 { 889 struct cfg80211_registered_device *rdev; 890 int res; 891 892 if (!netif_running(dev)) 893 return -ENETDOWN; 894 895 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 896 897 if (IS_ERR(rdev)) 898 return PTR_ERR(rdev); 899 900 if (rdev->scan_req) { 901 res = -EAGAIN; 902 goto out; 903 } 904 905 res = ieee80211_scan_results(rdev, info, extra, data->length); 906 data->length = 0; 907 if (res >= 0) { 908 data->length = res; 909 res = 0; 910 } 911 912 out: 913 cfg80211_put_dev(rdev); 914 return res; 915 } 916 EXPORT_SYMBOL(cfg80211_wext_giwscan); 917 #endif 918