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 found->pub.len_information_elements = ielen; 399 } 400 } 401 } 402 403 kref_put(&res->ref, bss_release); 404 } else { 405 /* this "consumes" the reference */ 406 list_add_tail(&res->list, &dev->bss_list); 407 rb_insert_bss(dev, res); 408 found = res; 409 } 410 411 dev->bss_generation++; 412 spin_unlock_bh(&dev->bss_lock); 413 414 kref_get(&found->ref); 415 return found; 416 } 417 418 struct cfg80211_bss * 419 cfg80211_inform_bss_frame(struct wiphy *wiphy, 420 struct ieee80211_channel *channel, 421 struct ieee80211_mgmt *mgmt, size_t len, 422 s32 signal, gfp_t gfp) 423 { 424 struct cfg80211_internal_bss *res; 425 size_t ielen = len - offsetof(struct ieee80211_mgmt, 426 u.probe_resp.variable); 427 bool overwrite; 428 size_t privsz = wiphy->bss_priv_size; 429 430 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 431 (signal < 0 || signal > 100))) 432 return NULL; 433 434 if (WARN_ON(!mgmt || !wiphy || 435 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 436 return NULL; 437 438 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 439 if (!res) 440 return NULL; 441 442 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 443 res->pub.channel = channel; 444 res->pub.signal = signal; 445 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 446 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 447 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 448 /* point to after the private area */ 449 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 450 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 451 res->pub.len_information_elements = ielen; 452 453 kref_init(&res->ref); 454 455 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 456 457 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 458 if (!res) 459 return NULL; 460 461 if (res->pub.capability & WLAN_CAPABILITY_ESS) 462 regulatory_hint_found_beacon(wiphy, channel, gfp); 463 464 /* cfg80211_bss_update gives us a referenced result */ 465 return &res->pub; 466 } 467 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 468 469 void cfg80211_put_bss(struct cfg80211_bss *pub) 470 { 471 struct cfg80211_internal_bss *bss; 472 473 if (!pub) 474 return; 475 476 bss = container_of(pub, struct cfg80211_internal_bss, pub); 477 kref_put(&bss->ref, bss_release); 478 } 479 EXPORT_SYMBOL(cfg80211_put_bss); 480 481 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 482 { 483 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 484 struct cfg80211_internal_bss *bss; 485 486 if (WARN_ON(!pub)) 487 return; 488 489 bss = container_of(pub, struct cfg80211_internal_bss, pub); 490 491 spin_lock_bh(&dev->bss_lock); 492 493 list_del(&bss->list); 494 rb_erase(&bss->rbn, &dev->bss_tree); 495 496 spin_unlock_bh(&dev->bss_lock); 497 498 kref_put(&bss->ref, bss_release); 499 } 500 EXPORT_SYMBOL(cfg80211_unlink_bss); 501 502 void cfg80211_hold_bss(struct cfg80211_bss *pub) 503 { 504 struct cfg80211_internal_bss *bss; 505 506 if (!pub) 507 return; 508 509 bss = container_of(pub, struct cfg80211_internal_bss, pub); 510 bss->hold = true; 511 } 512 EXPORT_SYMBOL(cfg80211_hold_bss); 513 514 void cfg80211_unhold_bss(struct cfg80211_bss *pub) 515 { 516 struct cfg80211_internal_bss *bss; 517 518 if (!pub) 519 return; 520 521 bss = container_of(pub, struct cfg80211_internal_bss, pub); 522 bss->hold = false; 523 } 524 EXPORT_SYMBOL(cfg80211_unhold_bss); 525 526 #ifdef CONFIG_WIRELESS_EXT 527 int cfg80211_wext_siwscan(struct net_device *dev, 528 struct iw_request_info *info, 529 union iwreq_data *wrqu, char *extra) 530 { 531 struct cfg80211_registered_device *rdev; 532 struct wiphy *wiphy; 533 struct iw_scan_req *wreq = NULL; 534 struct cfg80211_scan_request *creq; 535 int i, err, n_channels = 0; 536 enum ieee80211_band band; 537 538 if (!netif_running(dev)) 539 return -ENETDOWN; 540 541 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 542 543 if (IS_ERR(rdev)) 544 return PTR_ERR(rdev); 545 546 if (rdev->scan_req) { 547 err = -EBUSY; 548 goto out; 549 } 550 551 wiphy = &rdev->wiphy; 552 553 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 554 if (wiphy->bands[band]) 555 n_channels += wiphy->bands[band]->n_channels; 556 557 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 558 n_channels * sizeof(void *), 559 GFP_ATOMIC); 560 if (!creq) { 561 err = -ENOMEM; 562 goto out; 563 } 564 565 creq->wiphy = wiphy; 566 creq->ifidx = dev->ifindex; 567 creq->ssids = (void *)(creq + 1); 568 creq->channels = (void *)(creq->ssids + 1); 569 creq->n_channels = n_channels; 570 creq->n_ssids = 1; 571 572 /* all channels */ 573 i = 0; 574 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 575 int j; 576 if (!wiphy->bands[band]) 577 continue; 578 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 579 creq->channels[i] = &wiphy->bands[band]->channels[j]; 580 i++; 581 } 582 } 583 584 /* translate scan request */ 585 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 586 wreq = (struct iw_scan_req *)extra; 587 588 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 589 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 590 return -EINVAL; 591 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 592 creq->ssids[0].ssid_len = wreq->essid_len; 593 } 594 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 595 creq->n_ssids = 0; 596 } 597 598 rdev->scan_req = creq; 599 err = rdev->ops->scan(wiphy, dev, creq); 600 if (err) { 601 rdev->scan_req = NULL; 602 kfree(creq); 603 } 604 out: 605 cfg80211_put_dev(rdev); 606 return err; 607 } 608 EXPORT_SYMBOL(cfg80211_wext_siwscan); 609 610 static void ieee80211_scan_add_ies(struct iw_request_info *info, 611 struct cfg80211_bss *bss, 612 char **current_ev, char *end_buf) 613 { 614 u8 *pos, *end, *next; 615 struct iw_event iwe; 616 617 if (!bss->information_elements || 618 !bss->len_information_elements) 619 return; 620 621 /* 622 * If needed, fragment the IEs buffer (at IE boundaries) into short 623 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 624 */ 625 pos = bss->information_elements; 626 end = pos + bss->len_information_elements; 627 628 while (end - pos > IW_GENERIC_IE_MAX) { 629 next = pos + 2 + pos[1]; 630 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 631 next = next + 2 + next[1]; 632 633 memset(&iwe, 0, sizeof(iwe)); 634 iwe.cmd = IWEVGENIE; 635 iwe.u.data.length = next - pos; 636 *current_ev = iwe_stream_add_point(info, *current_ev, 637 end_buf, &iwe, pos); 638 639 pos = next; 640 } 641 642 if (end > pos) { 643 memset(&iwe, 0, sizeof(iwe)); 644 iwe.cmd = IWEVGENIE; 645 iwe.u.data.length = end - pos; 646 *current_ev = iwe_stream_add_point(info, *current_ev, 647 end_buf, &iwe, pos); 648 } 649 } 650 651 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 652 { 653 unsigned long end = jiffies; 654 655 if (end >= start) 656 return jiffies_to_msecs(end - start); 657 658 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 659 } 660 661 static char * 662 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 663 struct cfg80211_internal_bss *bss, char *current_ev, 664 char *end_buf) 665 { 666 struct iw_event iwe; 667 u8 *buf, *cfg, *p; 668 u8 *ie = bss->pub.information_elements; 669 int rem = bss->pub.len_information_elements, i, sig; 670 bool ismesh = false; 671 672 memset(&iwe, 0, sizeof(iwe)); 673 iwe.cmd = SIOCGIWAP; 674 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 675 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 676 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 677 IW_EV_ADDR_LEN); 678 679 memset(&iwe, 0, sizeof(iwe)); 680 iwe.cmd = SIOCGIWFREQ; 681 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 682 iwe.u.freq.e = 0; 683 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 684 IW_EV_FREQ_LEN); 685 686 memset(&iwe, 0, sizeof(iwe)); 687 iwe.cmd = SIOCGIWFREQ; 688 iwe.u.freq.m = bss->pub.channel->center_freq; 689 iwe.u.freq.e = 6; 690 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 691 IW_EV_FREQ_LEN); 692 693 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 694 memset(&iwe, 0, sizeof(iwe)); 695 iwe.cmd = IWEVQUAL; 696 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 697 IW_QUAL_NOISE_INVALID | 698 IW_QUAL_QUAL_UPDATED; 699 switch (wiphy->signal_type) { 700 case CFG80211_SIGNAL_TYPE_MBM: 701 sig = bss->pub.signal / 100; 702 iwe.u.qual.level = sig; 703 iwe.u.qual.updated |= IW_QUAL_DBM; 704 if (sig < -110) /* rather bad */ 705 sig = -110; 706 else if (sig > -40) /* perfect */ 707 sig = -40; 708 /* will give a range of 0 .. 70 */ 709 iwe.u.qual.qual = sig + 110; 710 break; 711 case CFG80211_SIGNAL_TYPE_UNSPEC: 712 iwe.u.qual.level = bss->pub.signal; 713 /* will give range 0 .. 100 */ 714 iwe.u.qual.qual = bss->pub.signal; 715 break; 716 default: 717 /* not reached */ 718 break; 719 } 720 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 721 &iwe, IW_EV_QUAL_LEN); 722 } 723 724 memset(&iwe, 0, sizeof(iwe)); 725 iwe.cmd = SIOCGIWENCODE; 726 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 727 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 728 else 729 iwe.u.data.flags = IW_ENCODE_DISABLED; 730 iwe.u.data.length = 0; 731 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 732 &iwe, ""); 733 734 while (rem >= 2) { 735 /* invalid data */ 736 if (ie[1] > rem - 2) 737 break; 738 739 switch (ie[0]) { 740 case WLAN_EID_SSID: 741 memset(&iwe, 0, sizeof(iwe)); 742 iwe.cmd = SIOCGIWESSID; 743 iwe.u.data.length = ie[1]; 744 iwe.u.data.flags = 1; 745 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 746 &iwe, ie + 2); 747 break; 748 case WLAN_EID_MESH_ID: 749 memset(&iwe, 0, sizeof(iwe)); 750 iwe.cmd = SIOCGIWESSID; 751 iwe.u.data.length = ie[1]; 752 iwe.u.data.flags = 1; 753 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 754 &iwe, ie + 2); 755 break; 756 case WLAN_EID_MESH_CONFIG: 757 ismesh = true; 758 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 759 break; 760 buf = kmalloc(50, GFP_ATOMIC); 761 if (!buf) 762 break; 763 cfg = ie + 2; 764 memset(&iwe, 0, sizeof(iwe)); 765 iwe.cmd = IWEVCUSTOM; 766 sprintf(buf, "Mesh network (version %d)", cfg[0]); 767 iwe.u.data.length = strlen(buf); 768 current_ev = iwe_stream_add_point(info, current_ev, 769 end_buf, 770 &iwe, buf); 771 sprintf(buf, "Path Selection Protocol ID: " 772 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 773 cfg[4]); 774 iwe.u.data.length = strlen(buf); 775 current_ev = iwe_stream_add_point(info, current_ev, 776 end_buf, 777 &iwe, buf); 778 sprintf(buf, "Path Selection Metric ID: " 779 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 780 cfg[8]); 781 iwe.u.data.length = strlen(buf); 782 current_ev = iwe_stream_add_point(info, current_ev, 783 end_buf, 784 &iwe, buf); 785 sprintf(buf, "Congestion Control Mode ID: " 786 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 787 cfg[11], cfg[12]); 788 iwe.u.data.length = strlen(buf); 789 current_ev = iwe_stream_add_point(info, current_ev, 790 end_buf, 791 &iwe, buf); 792 sprintf(buf, "Channel Precedence: " 793 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 794 cfg[15], cfg[16]); 795 iwe.u.data.length = strlen(buf); 796 current_ev = iwe_stream_add_point(info, current_ev, 797 end_buf, 798 &iwe, buf); 799 kfree(buf); 800 break; 801 case WLAN_EID_SUPP_RATES: 802 case WLAN_EID_EXT_SUPP_RATES: 803 /* display all supported rates in readable format */ 804 p = current_ev + iwe_stream_lcp_len(info); 805 806 memset(&iwe, 0, sizeof(iwe)); 807 iwe.cmd = SIOCGIWRATE; 808 /* Those two flags are ignored... */ 809 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 810 811 for (i = 0; i < ie[1]; i++) { 812 iwe.u.bitrate.value = 813 ((ie[i + 2] & 0x7f) * 500000); 814 p = iwe_stream_add_value(info, current_ev, p, 815 end_buf, &iwe, IW_EV_PARAM_LEN); 816 } 817 current_ev = p; 818 break; 819 } 820 rem -= ie[1] + 2; 821 ie += ie[1] + 2; 822 } 823 824 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 825 || ismesh) { 826 memset(&iwe, 0, sizeof(iwe)); 827 iwe.cmd = SIOCGIWMODE; 828 if (ismesh) 829 iwe.u.mode = IW_MODE_MESH; 830 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 831 iwe.u.mode = IW_MODE_MASTER; 832 else 833 iwe.u.mode = IW_MODE_ADHOC; 834 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 835 &iwe, IW_EV_UINT_LEN); 836 } 837 838 buf = kmalloc(30, GFP_ATOMIC); 839 if (buf) { 840 memset(&iwe, 0, sizeof(iwe)); 841 iwe.cmd = IWEVCUSTOM; 842 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 843 iwe.u.data.length = strlen(buf); 844 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 845 &iwe, buf); 846 memset(&iwe, 0, sizeof(iwe)); 847 iwe.cmd = IWEVCUSTOM; 848 sprintf(buf, " Last beacon: %ums ago", 849 elapsed_jiffies_msecs(bss->ts)); 850 iwe.u.data.length = strlen(buf); 851 current_ev = iwe_stream_add_point(info, current_ev, 852 end_buf, &iwe, buf); 853 kfree(buf); 854 } 855 856 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 857 858 return current_ev; 859 } 860 861 862 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 863 struct iw_request_info *info, 864 char *buf, size_t len) 865 { 866 char *current_ev = buf; 867 char *end_buf = buf + len; 868 struct cfg80211_internal_bss *bss; 869 870 spin_lock_bh(&dev->bss_lock); 871 cfg80211_bss_expire(dev); 872 873 list_for_each_entry(bss, &dev->bss_list, list) { 874 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 875 spin_unlock_bh(&dev->bss_lock); 876 return -E2BIG; 877 } 878 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 879 current_ev, end_buf); 880 } 881 spin_unlock_bh(&dev->bss_lock); 882 return current_ev - buf; 883 } 884 885 886 int cfg80211_wext_giwscan(struct net_device *dev, 887 struct iw_request_info *info, 888 struct iw_point *data, char *extra) 889 { 890 struct cfg80211_registered_device *rdev; 891 int res; 892 893 if (!netif_running(dev)) 894 return -ENETDOWN; 895 896 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 897 898 if (IS_ERR(rdev)) 899 return PTR_ERR(rdev); 900 901 if (rdev->scan_req) { 902 res = -EAGAIN; 903 goto out; 904 } 905 906 res = ieee80211_scan_results(rdev, info, extra, data->length); 907 data->length = 0; 908 if (res >= 0) { 909 data->length = res; 910 res = 0; 911 } 912 913 out: 914 cfg80211_put_dev(rdev); 915 return res; 916 } 917 EXPORT_SYMBOL(cfg80211_wext_giwscan); 918 #endif 919