scan.c revision a08c1c1ac0c26229ca1ca45d554b209a56edc8be
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 20void 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} 52EXPORT_SYMBOL(cfg80211_scan_done); 53 54static 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 kfree(bss); 62} 63 64/* must hold dev->bss_lock! */ 65void cfg80211_bss_age(struct cfg80211_registered_device *dev, 66 unsigned long age_secs) 67{ 68 struct cfg80211_internal_bss *bss; 69 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 70 71 list_for_each_entry(bss, &dev->bss_list, list) { 72 bss->ts -= age_jiffies; 73 } 74} 75 76/* must hold dev->bss_lock! */ 77void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 78{ 79 struct cfg80211_internal_bss *bss, *tmp; 80 bool expired = false; 81 82 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 83 if (bss->hold || 84 !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 85 continue; 86 list_del(&bss->list); 87 rb_erase(&bss->rbn, &dev->bss_tree); 88 kref_put(&bss->ref, bss_release); 89 expired = true; 90 } 91 92 if (expired) 93 dev->bss_generation++; 94} 95 96static u8 *find_ie(u8 num, u8 *ies, size_t len) 97{ 98 while (len > 2 && ies[0] != num) { 99 len -= ies[1] + 2; 100 ies += ies[1] + 2; 101 } 102 if (len < 2) 103 return NULL; 104 if (len < 2 + ies[1]) 105 return NULL; 106 return ies; 107} 108 109static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 110{ 111 const u8 *ie1 = find_ie(num, ies1, len1); 112 const u8 *ie2 = find_ie(num, ies2, len2); 113 int r; 114 115 if (!ie1 && !ie2) 116 return 0; 117 if (!ie1) 118 return -1; 119 120 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 121 if (r == 0 && ie1[1] != ie2[1]) 122 return ie2[1] - ie1[1]; 123 return r; 124} 125 126static bool is_bss(struct cfg80211_bss *a, 127 const u8 *bssid, 128 const u8 *ssid, size_t ssid_len) 129{ 130 const u8 *ssidie; 131 132 if (bssid && compare_ether_addr(a->bssid, bssid)) 133 return false; 134 135 if (!ssid) 136 return true; 137 138 ssidie = find_ie(WLAN_EID_SSID, 139 a->information_elements, 140 a->len_information_elements); 141 if (!ssidie) 142 return false; 143 if (ssidie[1] != ssid_len) 144 return false; 145 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 146} 147 148static bool is_mesh(struct cfg80211_bss *a, 149 const u8 *meshid, size_t meshidlen, 150 const u8 *meshcfg) 151{ 152 const u8 *ie; 153 154 if (!is_zero_ether_addr(a->bssid)) 155 return false; 156 157 ie = find_ie(WLAN_EID_MESH_ID, 158 a->information_elements, 159 a->len_information_elements); 160 if (!ie) 161 return false; 162 if (ie[1] != meshidlen) 163 return false; 164 if (memcmp(ie + 2, meshid, meshidlen)) 165 return false; 166 167 ie = find_ie(WLAN_EID_MESH_CONFIG, 168 a->information_elements, 169 a->len_information_elements); 170 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 171 return false; 172 173 /* 174 * Ignore mesh capability (last two bytes of the IE) when 175 * comparing since that may differ between stations taking 176 * part in the same mesh. 177 */ 178 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 179} 180 181static int cmp_bss(struct cfg80211_bss *a, 182 struct cfg80211_bss *b) 183{ 184 int r; 185 186 if (a->channel != b->channel) 187 return b->channel->center_freq - a->channel->center_freq; 188 189 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 190 if (r) 191 return r; 192 193 if (is_zero_ether_addr(a->bssid)) { 194 r = cmp_ies(WLAN_EID_MESH_ID, 195 a->information_elements, 196 a->len_information_elements, 197 b->information_elements, 198 b->len_information_elements); 199 if (r) 200 return r; 201 return cmp_ies(WLAN_EID_MESH_CONFIG, 202 a->information_elements, 203 a->len_information_elements, 204 b->information_elements, 205 b->len_information_elements); 206 } 207 208 return cmp_ies(WLAN_EID_SSID, 209 a->information_elements, 210 a->len_information_elements, 211 b->information_elements, 212 b->len_information_elements); 213} 214 215struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 216 struct ieee80211_channel *channel, 217 const u8 *bssid, 218 const u8 *ssid, size_t ssid_len, 219 u16 capa_mask, u16 capa_val) 220{ 221 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 222 struct cfg80211_internal_bss *bss, *res = NULL; 223 224 spin_lock_bh(&dev->bss_lock); 225 226 list_for_each_entry(bss, &dev->bss_list, list) { 227 if ((bss->pub.capability & capa_mask) != capa_val) 228 continue; 229 if (channel && bss->pub.channel != channel) 230 continue; 231 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 232 res = bss; 233 kref_get(&res->ref); 234 break; 235 } 236 } 237 238 spin_unlock_bh(&dev->bss_lock); 239 if (!res) 240 return NULL; 241 return &res->pub; 242} 243EXPORT_SYMBOL(cfg80211_get_bss); 244 245struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 246 struct ieee80211_channel *channel, 247 const u8 *meshid, size_t meshidlen, 248 const u8 *meshcfg) 249{ 250 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 251 struct cfg80211_internal_bss *bss, *res = NULL; 252 253 spin_lock_bh(&dev->bss_lock); 254 255 list_for_each_entry(bss, &dev->bss_list, list) { 256 if (channel && bss->pub.channel != channel) 257 continue; 258 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 259 res = bss; 260 kref_get(&res->ref); 261 break; 262 } 263 } 264 265 spin_unlock_bh(&dev->bss_lock); 266 if (!res) 267 return NULL; 268 return &res->pub; 269} 270EXPORT_SYMBOL(cfg80211_get_mesh); 271 272 273static void rb_insert_bss(struct cfg80211_registered_device *dev, 274 struct cfg80211_internal_bss *bss) 275{ 276 struct rb_node **p = &dev->bss_tree.rb_node; 277 struct rb_node *parent = NULL; 278 struct cfg80211_internal_bss *tbss; 279 int cmp; 280 281 while (*p) { 282 parent = *p; 283 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 284 285 cmp = cmp_bss(&bss->pub, &tbss->pub); 286 287 if (WARN_ON(!cmp)) { 288 /* will sort of leak this BSS */ 289 return; 290 } 291 292 if (cmp < 0) 293 p = &(*p)->rb_left; 294 else 295 p = &(*p)->rb_right; 296 } 297 298 rb_link_node(&bss->rbn, parent, p); 299 rb_insert_color(&bss->rbn, &dev->bss_tree); 300} 301 302static struct cfg80211_internal_bss * 303rb_find_bss(struct cfg80211_registered_device *dev, 304 struct cfg80211_internal_bss *res) 305{ 306 struct rb_node *n = dev->bss_tree.rb_node; 307 struct cfg80211_internal_bss *bss; 308 int r; 309 310 while (n) { 311 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 312 r = cmp_bss(&res->pub, &bss->pub); 313 314 if (r == 0) 315 return bss; 316 else if (r < 0) 317 n = n->rb_left; 318 else 319 n = n->rb_right; 320 } 321 322 return NULL; 323} 324 325static struct cfg80211_internal_bss * 326cfg80211_bss_update(struct cfg80211_registered_device *dev, 327 struct cfg80211_internal_bss *res, 328 bool overwrite) 329{ 330 struct cfg80211_internal_bss *found = NULL; 331 const u8 *meshid, *meshcfg; 332 333 /* 334 * The reference to "res" is donated to this function. 335 */ 336 337 if (WARN_ON(!res->pub.channel)) { 338 kref_put(&res->ref, bss_release); 339 return NULL; 340 } 341 342 res->ts = jiffies; 343 344 if (is_zero_ether_addr(res->pub.bssid)) { 345 /* must be mesh, verify */ 346 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 347 res->pub.len_information_elements); 348 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 349 res->pub.information_elements, 350 res->pub.len_information_elements); 351 if (!meshid || !meshcfg || 352 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 353 /* bogus mesh */ 354 kref_put(&res->ref, bss_release); 355 return NULL; 356 } 357 } 358 359 spin_lock_bh(&dev->bss_lock); 360 361 found = rb_find_bss(dev, res); 362 363 if (found && overwrite) { 364 list_replace(&found->list, &res->list); 365 rb_replace_node(&found->rbn, &res->rbn, 366 &dev->bss_tree); 367 kref_put(&found->ref, bss_release); 368 found = res; 369 } else if (found) { 370 kref_get(&found->ref); 371 found->pub.beacon_interval = res->pub.beacon_interval; 372 found->pub.tsf = res->pub.tsf; 373 found->pub.signal = res->pub.signal; 374 found->pub.capability = res->pub.capability; 375 found->ts = res->ts; 376 kref_put(&res->ref, bss_release); 377 } else { 378 /* this "consumes" the reference */ 379 list_add_tail(&res->list, &dev->bss_list); 380 rb_insert_bss(dev, res); 381 found = res; 382 } 383 384 dev->bss_generation++; 385 spin_unlock_bh(&dev->bss_lock); 386 387 kref_get(&found->ref); 388 return found; 389} 390 391struct cfg80211_bss * 392cfg80211_inform_bss_frame(struct wiphy *wiphy, 393 struct ieee80211_channel *channel, 394 struct ieee80211_mgmt *mgmt, size_t len, 395 s32 signal, gfp_t gfp) 396{ 397 struct cfg80211_internal_bss *res; 398 size_t ielen = len - offsetof(struct ieee80211_mgmt, 399 u.probe_resp.variable); 400 bool overwrite; 401 size_t privsz = wiphy->bss_priv_size; 402 403 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && 404 (signal < 0 || signal > 100))) 405 return NULL; 406 407 if (WARN_ON(!mgmt || !wiphy || 408 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 409 return NULL; 410 411 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 412 if (!res) 413 return NULL; 414 415 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 416 res->pub.channel = channel; 417 res->pub.signal = signal; 418 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 419 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 420 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 421 /* point to after the private area */ 422 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 423 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 424 res->pub.len_information_elements = ielen; 425 426 kref_init(&res->ref); 427 428 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 429 430 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 431 if (!res) 432 return NULL; 433 434 if (res->pub.capability & WLAN_CAPABILITY_ESS) 435 regulatory_hint_found_beacon(wiphy, channel, gfp); 436 437 /* cfg80211_bss_update gives us a referenced result */ 438 return &res->pub; 439} 440EXPORT_SYMBOL(cfg80211_inform_bss_frame); 441 442void cfg80211_put_bss(struct cfg80211_bss *pub) 443{ 444 struct cfg80211_internal_bss *bss; 445 446 if (!pub) 447 return; 448 449 bss = container_of(pub, struct cfg80211_internal_bss, pub); 450 kref_put(&bss->ref, bss_release); 451} 452EXPORT_SYMBOL(cfg80211_put_bss); 453 454void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 455{ 456 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 457 struct cfg80211_internal_bss *bss; 458 459 if (WARN_ON(!pub)) 460 return; 461 462 bss = container_of(pub, struct cfg80211_internal_bss, pub); 463 464 spin_lock_bh(&dev->bss_lock); 465 466 list_del(&bss->list); 467 rb_erase(&bss->rbn, &dev->bss_tree); 468 469 spin_unlock_bh(&dev->bss_lock); 470 471 kref_put(&bss->ref, bss_release); 472} 473EXPORT_SYMBOL(cfg80211_unlink_bss); 474 475void cfg80211_hold_bss(struct cfg80211_bss *pub) 476{ 477 struct cfg80211_internal_bss *bss; 478 479 if (!pub) 480 return; 481 482 bss = container_of(pub, struct cfg80211_internal_bss, pub); 483 bss->hold = true; 484} 485EXPORT_SYMBOL(cfg80211_hold_bss); 486 487void cfg80211_unhold_bss(struct cfg80211_bss *pub) 488{ 489 struct cfg80211_internal_bss *bss; 490 491 if (!pub) 492 return; 493 494 bss = container_of(pub, struct cfg80211_internal_bss, pub); 495 bss->hold = false; 496} 497EXPORT_SYMBOL(cfg80211_unhold_bss); 498 499#ifdef CONFIG_WIRELESS_EXT 500int cfg80211_wext_siwscan(struct net_device *dev, 501 struct iw_request_info *info, 502 union iwreq_data *wrqu, char *extra) 503{ 504 struct cfg80211_registered_device *rdev; 505 struct wiphy *wiphy; 506 struct iw_scan_req *wreq = NULL; 507 struct cfg80211_scan_request *creq; 508 int i, err, n_channels = 0; 509 enum ieee80211_band band; 510 511 if (!netif_running(dev)) 512 return -ENETDOWN; 513 514 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 515 516 if (IS_ERR(rdev)) 517 return PTR_ERR(rdev); 518 519 if (rdev->scan_req) { 520 err = -EBUSY; 521 goto out; 522 } 523 524 wiphy = &rdev->wiphy; 525 526 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 527 if (wiphy->bands[band]) 528 n_channels += wiphy->bands[band]->n_channels; 529 530 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 531 n_channels * sizeof(void *), 532 GFP_ATOMIC); 533 if (!creq) { 534 err = -ENOMEM; 535 goto out; 536 } 537 538 creq->wiphy = wiphy; 539 creq->ifidx = dev->ifindex; 540 creq->ssids = (void *)(creq + 1); 541 creq->channels = (void *)(creq->ssids + 1); 542 creq->n_channels = n_channels; 543 creq->n_ssids = 1; 544 545 /* all channels */ 546 i = 0; 547 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 548 int j; 549 if (!wiphy->bands[band]) 550 continue; 551 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 552 creq->channels[i] = &wiphy->bands[band]->channels[j]; 553 i++; 554 } 555 } 556 557 /* translate scan request */ 558 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 559 wreq = (struct iw_scan_req *)extra; 560 561 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 562 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 563 return -EINVAL; 564 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 565 creq->ssids[0].ssid_len = wreq->essid_len; 566 } 567 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 568 creq->n_ssids = 0; 569 } 570 571 rdev->scan_req = creq; 572 err = rdev->ops->scan(wiphy, dev, creq); 573 if (err) { 574 rdev->scan_req = NULL; 575 kfree(creq); 576 } 577 out: 578 cfg80211_put_dev(rdev); 579 return err; 580} 581EXPORT_SYMBOL(cfg80211_wext_siwscan); 582 583static void ieee80211_scan_add_ies(struct iw_request_info *info, 584 struct cfg80211_bss *bss, 585 char **current_ev, char *end_buf) 586{ 587 u8 *pos, *end, *next; 588 struct iw_event iwe; 589 590 if (!bss->information_elements || 591 !bss->len_information_elements) 592 return; 593 594 /* 595 * If needed, fragment the IEs buffer (at IE boundaries) into short 596 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 597 */ 598 pos = bss->information_elements; 599 end = pos + bss->len_information_elements; 600 601 while (end - pos > IW_GENERIC_IE_MAX) { 602 next = pos + 2 + pos[1]; 603 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 604 next = next + 2 + next[1]; 605 606 memset(&iwe, 0, sizeof(iwe)); 607 iwe.cmd = IWEVGENIE; 608 iwe.u.data.length = next - pos; 609 *current_ev = iwe_stream_add_point(info, *current_ev, 610 end_buf, &iwe, pos); 611 612 pos = next; 613 } 614 615 if (end > pos) { 616 memset(&iwe, 0, sizeof(iwe)); 617 iwe.cmd = IWEVGENIE; 618 iwe.u.data.length = end - pos; 619 *current_ev = iwe_stream_add_point(info, *current_ev, 620 end_buf, &iwe, pos); 621 } 622} 623 624static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 625{ 626 unsigned long end = jiffies; 627 628 if (end >= start) 629 return jiffies_to_msecs(end - start); 630 631 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 632} 633 634static char * 635ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 636 struct cfg80211_internal_bss *bss, char *current_ev, 637 char *end_buf) 638{ 639 struct iw_event iwe; 640 u8 *buf, *cfg, *p; 641 u8 *ie = bss->pub.information_elements; 642 int rem = bss->pub.len_information_elements, i, sig; 643 bool ismesh = false; 644 645 memset(&iwe, 0, sizeof(iwe)); 646 iwe.cmd = SIOCGIWAP; 647 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 648 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 649 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 650 IW_EV_ADDR_LEN); 651 652 memset(&iwe, 0, sizeof(iwe)); 653 iwe.cmd = SIOCGIWFREQ; 654 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 655 iwe.u.freq.e = 0; 656 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 657 IW_EV_FREQ_LEN); 658 659 memset(&iwe, 0, sizeof(iwe)); 660 iwe.cmd = SIOCGIWFREQ; 661 iwe.u.freq.m = bss->pub.channel->center_freq; 662 iwe.u.freq.e = 6; 663 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 664 IW_EV_FREQ_LEN); 665 666 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 667 memset(&iwe, 0, sizeof(iwe)); 668 iwe.cmd = IWEVQUAL; 669 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 670 IW_QUAL_NOISE_INVALID | 671 IW_QUAL_QUAL_UPDATED; 672 switch (wiphy->signal_type) { 673 case CFG80211_SIGNAL_TYPE_MBM: 674 sig = bss->pub.signal / 100; 675 iwe.u.qual.level = sig; 676 iwe.u.qual.updated |= IW_QUAL_DBM; 677 if (sig < -110) /* rather bad */ 678 sig = -110; 679 else if (sig > -40) /* perfect */ 680 sig = -40; 681 /* will give a range of 0 .. 70 */ 682 iwe.u.qual.qual = sig + 110; 683 break; 684 case CFG80211_SIGNAL_TYPE_UNSPEC: 685 iwe.u.qual.level = bss->pub.signal; 686 /* will give range 0 .. 100 */ 687 iwe.u.qual.qual = bss->pub.signal; 688 break; 689 default: 690 /* not reached */ 691 break; 692 } 693 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 694 &iwe, IW_EV_QUAL_LEN); 695 } 696 697 memset(&iwe, 0, sizeof(iwe)); 698 iwe.cmd = SIOCGIWENCODE; 699 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 700 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 701 else 702 iwe.u.data.flags = IW_ENCODE_DISABLED; 703 iwe.u.data.length = 0; 704 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 705 &iwe, ""); 706 707 while (rem >= 2) { 708 /* invalid data */ 709 if (ie[1] > rem - 2) 710 break; 711 712 switch (ie[0]) { 713 case WLAN_EID_SSID: 714 memset(&iwe, 0, sizeof(iwe)); 715 iwe.cmd = SIOCGIWESSID; 716 iwe.u.data.length = ie[1]; 717 iwe.u.data.flags = 1; 718 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 719 &iwe, ie + 2); 720 break; 721 case WLAN_EID_MESH_ID: 722 memset(&iwe, 0, sizeof(iwe)); 723 iwe.cmd = SIOCGIWESSID; 724 iwe.u.data.length = ie[1]; 725 iwe.u.data.flags = 1; 726 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 727 &iwe, ie + 2); 728 break; 729 case WLAN_EID_MESH_CONFIG: 730 ismesh = true; 731 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 732 break; 733 buf = kmalloc(50, GFP_ATOMIC); 734 if (!buf) 735 break; 736 cfg = ie + 2; 737 memset(&iwe, 0, sizeof(iwe)); 738 iwe.cmd = IWEVCUSTOM; 739 sprintf(buf, "Mesh network (version %d)", cfg[0]); 740 iwe.u.data.length = strlen(buf); 741 current_ev = iwe_stream_add_point(info, current_ev, 742 end_buf, 743 &iwe, buf); 744 sprintf(buf, "Path Selection Protocol ID: " 745 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 746 cfg[4]); 747 iwe.u.data.length = strlen(buf); 748 current_ev = iwe_stream_add_point(info, current_ev, 749 end_buf, 750 &iwe, buf); 751 sprintf(buf, "Path Selection Metric ID: " 752 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 753 cfg[8]); 754 iwe.u.data.length = strlen(buf); 755 current_ev = iwe_stream_add_point(info, current_ev, 756 end_buf, 757 &iwe, buf); 758 sprintf(buf, "Congestion Control Mode ID: " 759 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 760 cfg[11], cfg[12]); 761 iwe.u.data.length = strlen(buf); 762 current_ev = iwe_stream_add_point(info, current_ev, 763 end_buf, 764 &iwe, buf); 765 sprintf(buf, "Channel Precedence: " 766 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 767 cfg[15], cfg[16]); 768 iwe.u.data.length = strlen(buf); 769 current_ev = iwe_stream_add_point(info, current_ev, 770 end_buf, 771 &iwe, buf); 772 kfree(buf); 773 break; 774 case WLAN_EID_SUPP_RATES: 775 case WLAN_EID_EXT_SUPP_RATES: 776 /* display all supported rates in readable format */ 777 p = current_ev + iwe_stream_lcp_len(info); 778 779 memset(&iwe, 0, sizeof(iwe)); 780 iwe.cmd = SIOCGIWRATE; 781 /* Those two flags are ignored... */ 782 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 783 784 for (i = 0; i < ie[1]; i++) { 785 iwe.u.bitrate.value = 786 ((ie[i + 2] & 0x7f) * 500000); 787 p = iwe_stream_add_value(info, current_ev, p, 788 end_buf, &iwe, IW_EV_PARAM_LEN); 789 } 790 current_ev = p; 791 break; 792 } 793 rem -= ie[1] + 2; 794 ie += ie[1] + 2; 795 } 796 797 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 798 || ismesh) { 799 memset(&iwe, 0, sizeof(iwe)); 800 iwe.cmd = SIOCGIWMODE; 801 if (ismesh) 802 iwe.u.mode = IW_MODE_MESH; 803 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 804 iwe.u.mode = IW_MODE_MASTER; 805 else 806 iwe.u.mode = IW_MODE_ADHOC; 807 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 808 &iwe, IW_EV_UINT_LEN); 809 } 810 811 buf = kmalloc(30, GFP_ATOMIC); 812 if (buf) { 813 memset(&iwe, 0, sizeof(iwe)); 814 iwe.cmd = IWEVCUSTOM; 815 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 816 iwe.u.data.length = strlen(buf); 817 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 818 &iwe, buf); 819 memset(&iwe, 0, sizeof(iwe)); 820 iwe.cmd = IWEVCUSTOM; 821 sprintf(buf, " Last beacon: %ums ago", 822 elapsed_jiffies_msecs(bss->ts)); 823 iwe.u.data.length = strlen(buf); 824 current_ev = iwe_stream_add_point(info, current_ev, 825 end_buf, &iwe, buf); 826 kfree(buf); 827 } 828 829 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 830 831 return current_ev; 832} 833 834 835static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 836 struct iw_request_info *info, 837 char *buf, size_t len) 838{ 839 char *current_ev = buf; 840 char *end_buf = buf + len; 841 struct cfg80211_internal_bss *bss; 842 843 spin_lock_bh(&dev->bss_lock); 844 cfg80211_bss_expire(dev); 845 846 list_for_each_entry(bss, &dev->bss_list, list) { 847 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 848 spin_unlock_bh(&dev->bss_lock); 849 return -E2BIG; 850 } 851 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 852 current_ev, end_buf); 853 } 854 spin_unlock_bh(&dev->bss_lock); 855 return current_ev - buf; 856} 857 858 859int cfg80211_wext_giwscan(struct net_device *dev, 860 struct iw_request_info *info, 861 struct iw_point *data, char *extra) 862{ 863 struct cfg80211_registered_device *rdev; 864 int res; 865 866 if (!netif_running(dev)) 867 return -ENETDOWN; 868 869 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 870 871 if (IS_ERR(rdev)) 872 return PTR_ERR(rdev); 873 874 if (rdev->scan_req) { 875 res = -EAGAIN; 876 goto out; 877 } 878 879 res = ieee80211_scan_results(rdev, info, extra, data->length); 880 data->length = 0; 881 if (res >= 0) { 882 data->length = res; 883 res = 0; 884 } 885 886 out: 887 cfg80211_put_dev(rdev); 888 return res; 889} 890EXPORT_SYMBOL(cfg80211_wext_giwscan); 891#endif 892