scan.c revision 78c1c7e109f1f14e7c18f290c4ebc58da220c7ba
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_expire(struct cfg80211_registered_device *dev) 66{ 67 struct cfg80211_internal_bss *bss, *tmp; 68 bool expired = false; 69 70 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 71 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 72 continue; 73 list_del(&bss->list); 74 rb_erase(&bss->rbn, &dev->bss_tree); 75 kref_put(&bss->ref, bss_release); 76 expired = true; 77 } 78 79 if (expired) 80 dev->bss_generation++; 81} 82 83static u8 *find_ie(u8 num, u8 *ies, size_t len) 84{ 85 while (len > 2 && ies[0] != num) { 86 len -= ies[1] + 2; 87 ies += ies[1] + 2; 88 } 89 if (len < 2) 90 return NULL; 91 if (len < 2 + ies[1]) 92 return NULL; 93 return ies; 94} 95 96static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 97{ 98 const u8 *ie1 = find_ie(num, ies1, len1); 99 const u8 *ie2 = find_ie(num, ies2, len2); 100 int r; 101 102 if (!ie1 && !ie2) 103 return 0; 104 if (!ie1) 105 return -1; 106 107 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 108 if (r == 0 && ie1[1] != ie2[1]) 109 return ie2[1] - ie1[1]; 110 return r; 111} 112 113static bool is_bss(struct cfg80211_bss *a, 114 const u8 *bssid, 115 const u8 *ssid, size_t ssid_len) 116{ 117 const u8 *ssidie; 118 119 if (compare_ether_addr(a->bssid, bssid)) 120 return false; 121 122 ssidie = find_ie(WLAN_EID_SSID, 123 a->information_elements, 124 a->len_information_elements); 125 if (!ssidie) 126 return false; 127 if (ssidie[1] != ssid_len) 128 return false; 129 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 130} 131 132static bool is_mesh(struct cfg80211_bss *a, 133 const u8 *meshid, size_t meshidlen, 134 const u8 *meshcfg) 135{ 136 const u8 *ie; 137 138 if (!is_zero_ether_addr(a->bssid)) 139 return false; 140 141 ie = find_ie(WLAN_EID_MESH_ID, 142 a->information_elements, 143 a->len_information_elements); 144 if (!ie) 145 return false; 146 if (ie[1] != meshidlen) 147 return false; 148 if (memcmp(ie + 2, meshid, meshidlen)) 149 return false; 150 151 ie = find_ie(WLAN_EID_MESH_CONFIG, 152 a->information_elements, 153 a->len_information_elements); 154 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 155 return false; 156 157 /* 158 * Ignore mesh capability (last two bytes of the IE) when 159 * comparing since that may differ between stations taking 160 * part in the same mesh. 161 */ 162 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; 163} 164 165static int cmp_bss(struct cfg80211_bss *a, 166 struct cfg80211_bss *b) 167{ 168 int r; 169 170 if (a->channel != b->channel) 171 return b->channel->center_freq - a->channel->center_freq; 172 173 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 174 if (r) 175 return r; 176 177 if (is_zero_ether_addr(a->bssid)) { 178 r = cmp_ies(WLAN_EID_MESH_ID, 179 a->information_elements, 180 a->len_information_elements, 181 b->information_elements, 182 b->len_information_elements); 183 if (r) 184 return r; 185 return cmp_ies(WLAN_EID_MESH_CONFIG, 186 a->information_elements, 187 a->len_information_elements, 188 b->information_elements, 189 b->len_information_elements); 190 } 191 192 return cmp_ies(WLAN_EID_SSID, 193 a->information_elements, 194 a->len_information_elements, 195 b->information_elements, 196 b->len_information_elements); 197} 198 199struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 200 struct ieee80211_channel *channel, 201 const u8 *bssid, 202 const u8 *ssid, size_t ssid_len) 203{ 204 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 205 struct cfg80211_internal_bss *bss, *res = NULL; 206 207 spin_lock_bh(&dev->bss_lock); 208 209 list_for_each_entry(bss, &dev->bss_list, list) { 210 if (channel && bss->pub.channel != channel) 211 continue; 212 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 213 res = bss; 214 kref_get(&res->ref); 215 break; 216 } 217 } 218 219 spin_unlock_bh(&dev->bss_lock); 220 if (!res) 221 return NULL; 222 return &res->pub; 223} 224EXPORT_SYMBOL(cfg80211_get_bss); 225 226struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 227 struct ieee80211_channel *channel, 228 const u8 *meshid, size_t meshidlen, 229 const u8 *meshcfg) 230{ 231 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 232 struct cfg80211_internal_bss *bss, *res = NULL; 233 234 spin_lock_bh(&dev->bss_lock); 235 236 list_for_each_entry(bss, &dev->bss_list, list) { 237 if (channel && bss->pub.channel != channel) 238 continue; 239 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 240 res = bss; 241 kref_get(&res->ref); 242 break; 243 } 244 } 245 246 spin_unlock_bh(&dev->bss_lock); 247 if (!res) 248 return NULL; 249 return &res->pub; 250} 251EXPORT_SYMBOL(cfg80211_get_mesh); 252 253 254static void rb_insert_bss(struct cfg80211_registered_device *dev, 255 struct cfg80211_internal_bss *bss) 256{ 257 struct rb_node **p = &dev->bss_tree.rb_node; 258 struct rb_node *parent = NULL; 259 struct cfg80211_internal_bss *tbss; 260 int cmp; 261 262 while (*p) { 263 parent = *p; 264 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 265 266 cmp = cmp_bss(&bss->pub, &tbss->pub); 267 268 if (WARN_ON(!cmp)) { 269 /* will sort of leak this BSS */ 270 return; 271 } 272 273 if (cmp < 0) 274 p = &(*p)->rb_left; 275 else 276 p = &(*p)->rb_right; 277 } 278 279 rb_link_node(&bss->rbn, parent, p); 280 rb_insert_color(&bss->rbn, &dev->bss_tree); 281} 282 283static struct cfg80211_internal_bss * 284rb_find_bss(struct cfg80211_registered_device *dev, 285 struct cfg80211_internal_bss *res) 286{ 287 struct rb_node *n = dev->bss_tree.rb_node; 288 struct cfg80211_internal_bss *bss; 289 int r; 290 291 while (n) { 292 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 293 r = cmp_bss(&res->pub, &bss->pub); 294 295 if (r == 0) 296 return bss; 297 else if (r < 0) 298 n = n->rb_left; 299 else 300 n = n->rb_right; 301 } 302 303 return NULL; 304} 305 306static struct cfg80211_internal_bss * 307cfg80211_bss_update(struct cfg80211_registered_device *dev, 308 struct cfg80211_internal_bss *res, 309 bool overwrite) 310{ 311 struct cfg80211_internal_bss *found = NULL; 312 const u8 *meshid, *meshcfg; 313 314 /* 315 * The reference to "res" is donated to this function. 316 */ 317 318 if (WARN_ON(!res->pub.channel)) { 319 kref_put(&res->ref, bss_release); 320 return NULL; 321 } 322 323 res->ts = jiffies; 324 325 if (is_zero_ether_addr(res->pub.bssid)) { 326 /* must be mesh, verify */ 327 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, 328 res->pub.len_information_elements); 329 meshcfg = find_ie(WLAN_EID_MESH_CONFIG, 330 res->pub.information_elements, 331 res->pub.len_information_elements); 332 if (!meshid || !meshcfg || 333 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { 334 /* bogus mesh */ 335 kref_put(&res->ref, bss_release); 336 return NULL; 337 } 338 } 339 340 spin_lock_bh(&dev->bss_lock); 341 342 found = rb_find_bss(dev, res); 343 344 if (found && overwrite) { 345 list_replace(&found->list, &res->list); 346 rb_replace_node(&found->rbn, &res->rbn, 347 &dev->bss_tree); 348 kref_put(&found->ref, bss_release); 349 found = res; 350 } else if (found) { 351 kref_get(&found->ref); 352 found->pub.beacon_interval = res->pub.beacon_interval; 353 found->pub.tsf = res->pub.tsf; 354 found->pub.signal = res->pub.signal; 355 found->pub.signal_type = res->pub.signal_type; 356 found->pub.capability = res->pub.capability; 357 found->ts = res->ts; 358 kref_put(&res->ref, bss_release); 359 } else { 360 /* this "consumes" the reference */ 361 list_add_tail(&res->list, &dev->bss_list); 362 rb_insert_bss(dev, res); 363 found = res; 364 } 365 366 dev->bss_generation++; 367 spin_unlock_bh(&dev->bss_lock); 368 369 kref_get(&found->ref); 370 return found; 371} 372 373struct cfg80211_bss * 374cfg80211_inform_bss_frame(struct wiphy *wiphy, 375 struct ieee80211_channel *channel, 376 struct ieee80211_mgmt *mgmt, size_t len, 377 s32 signal, enum cfg80211_signal_type sigtype, 378 gfp_t gfp) 379{ 380 struct cfg80211_internal_bss *res; 381 size_t ielen = len - offsetof(struct ieee80211_mgmt, 382 u.probe_resp.variable); 383 bool overwrite; 384 size_t privsz = wiphy->bss_priv_size; 385 386 if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC && 387 (signal < 0 || signal > 100))) 388 return NULL; 389 390 if (WARN_ON(!mgmt || !wiphy || 391 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 392 return NULL; 393 394 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 395 if (!res) 396 return NULL; 397 398 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 399 res->pub.channel = channel; 400 res->pub.signal_type = sigtype; 401 res->pub.signal = signal; 402 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 403 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 404 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 405 /* point to after the private area */ 406 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; 407 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); 408 res->pub.len_information_elements = ielen; 409 410 kref_init(&res->ref); 411 412 overwrite = ieee80211_is_probe_resp(mgmt->frame_control); 413 414 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); 415 if (!res) 416 return NULL; 417 418 /* cfg80211_bss_update gives us a referenced result */ 419 return &res->pub; 420} 421EXPORT_SYMBOL(cfg80211_inform_bss_frame); 422 423void cfg80211_put_bss(struct cfg80211_bss *pub) 424{ 425 struct cfg80211_internal_bss *bss; 426 427 if (!pub) 428 return; 429 430 bss = container_of(pub, struct cfg80211_internal_bss, pub); 431 kref_put(&bss->ref, bss_release); 432} 433EXPORT_SYMBOL(cfg80211_put_bss); 434 435#ifdef CONFIG_WIRELESS_EXT 436int cfg80211_wext_siwscan(struct net_device *dev, 437 struct iw_request_info *info, 438 union iwreq_data *wrqu, char *extra) 439{ 440 struct cfg80211_registered_device *rdev; 441 struct wiphy *wiphy; 442 struct iw_scan_req *wreq = NULL; 443 struct cfg80211_scan_request *creq; 444 int i, err, n_channels = 0; 445 enum ieee80211_band band; 446 447 if (!netif_running(dev)) 448 return -ENETDOWN; 449 450 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 451 452 if (IS_ERR(rdev)) 453 return PTR_ERR(rdev); 454 455 if (rdev->scan_req) { 456 err = -EBUSY; 457 goto out; 458 } 459 460 wiphy = &rdev->wiphy; 461 462 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 463 if (wiphy->bands[band]) 464 n_channels += wiphy->bands[band]->n_channels; 465 466 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 467 n_channels * sizeof(void *), 468 GFP_ATOMIC); 469 if (!creq) { 470 err = -ENOMEM; 471 goto out; 472 } 473 474 creq->wiphy = wiphy; 475 creq->ifidx = dev->ifindex; 476 creq->ssids = (void *)(creq + 1); 477 creq->channels = (void *)(creq->ssids + 1); 478 creq->n_channels = n_channels; 479 creq->n_ssids = 1; 480 481 /* all channels */ 482 i = 0; 483 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 484 int j; 485 if (!wiphy->bands[band]) 486 continue; 487 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 488 creq->channels[i] = &wiphy->bands[band]->channels[j]; 489 i++; 490 } 491 } 492 493 /* translate scan request */ 494 if (wrqu->data.length == sizeof(struct iw_scan_req)) { 495 wreq = (struct iw_scan_req *)extra; 496 497 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 498 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 499 return -EINVAL; 500 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 501 creq->ssids[0].ssid_len = wreq->essid_len; 502 } 503 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 504 creq->n_ssids = 0; 505 } 506 507 rdev->scan_req = creq; 508 err = rdev->ops->scan(wiphy, dev, creq); 509 if (err) { 510 rdev->scan_req = NULL; 511 kfree(creq); 512 } 513 out: 514 cfg80211_put_dev(rdev); 515 return err; 516} 517EXPORT_SYMBOL(cfg80211_wext_siwscan); 518 519static void ieee80211_scan_add_ies(struct iw_request_info *info, 520 struct cfg80211_bss *bss, 521 char **current_ev, char *end_buf) 522{ 523 u8 *pos, *end, *next; 524 struct iw_event iwe; 525 526 if (!bss->information_elements || 527 !bss->len_information_elements) 528 return; 529 530 /* 531 * If needed, fragment the IEs buffer (at IE boundaries) into short 532 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 533 */ 534 pos = bss->information_elements; 535 end = pos + bss->len_information_elements; 536 537 while (end - pos > IW_GENERIC_IE_MAX) { 538 next = pos + 2 + pos[1]; 539 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 540 next = next + 2 + next[1]; 541 542 memset(&iwe, 0, sizeof(iwe)); 543 iwe.cmd = IWEVGENIE; 544 iwe.u.data.length = next - pos; 545 *current_ev = iwe_stream_add_point(info, *current_ev, 546 end_buf, &iwe, pos); 547 548 pos = next; 549 } 550 551 if (end > pos) { 552 memset(&iwe, 0, sizeof(iwe)); 553 iwe.cmd = IWEVGENIE; 554 iwe.u.data.length = end - pos; 555 *current_ev = iwe_stream_add_point(info, *current_ev, 556 end_buf, &iwe, pos); 557 } 558} 559 560 561static char * 562ieee80211_bss(struct iw_request_info *info, 563 struct cfg80211_internal_bss *bss, 564 char *current_ev, char *end_buf) 565{ 566 struct iw_event iwe; 567 u8 *buf, *cfg, *p; 568 u8 *ie = bss->pub.information_elements; 569 int rem = bss->pub.len_information_elements, i; 570 bool ismesh = false; 571 572 memset(&iwe, 0, sizeof(iwe)); 573 iwe.cmd = SIOCGIWAP; 574 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 575 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 576 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 577 IW_EV_ADDR_LEN); 578 579 memset(&iwe, 0, sizeof(iwe)); 580 iwe.cmd = SIOCGIWFREQ; 581 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 582 iwe.u.freq.e = 0; 583 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 584 IW_EV_FREQ_LEN); 585 586 memset(&iwe, 0, sizeof(iwe)); 587 iwe.cmd = SIOCGIWFREQ; 588 iwe.u.freq.m = bss->pub.channel->center_freq; 589 iwe.u.freq.e = 6; 590 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 591 IW_EV_FREQ_LEN); 592 593 if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) { 594 memset(&iwe, 0, sizeof(iwe)); 595 iwe.cmd = IWEVQUAL; 596 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 597 IW_QUAL_NOISE_INVALID | 598 IW_QUAL_QUAL_INVALID; 599 switch (bss->pub.signal_type) { 600 case CFG80211_SIGNAL_TYPE_MBM: 601 iwe.u.qual.level = bss->pub.signal / 100; 602 iwe.u.qual.updated |= IW_QUAL_DBM; 603 break; 604 case CFG80211_SIGNAL_TYPE_UNSPEC: 605 iwe.u.qual.level = bss->pub.signal; 606 break; 607 default: 608 /* not reached */ 609 break; 610 } 611 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 612 &iwe, IW_EV_QUAL_LEN); 613 } 614 615 memset(&iwe, 0, sizeof(iwe)); 616 iwe.cmd = SIOCGIWENCODE; 617 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 618 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 619 else 620 iwe.u.data.flags = IW_ENCODE_DISABLED; 621 iwe.u.data.length = 0; 622 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 623 &iwe, ""); 624 625 while (rem >= 2) { 626 /* invalid data */ 627 if (ie[1] > rem - 2) 628 break; 629 630 switch (ie[0]) { 631 case WLAN_EID_SSID: 632 memset(&iwe, 0, sizeof(iwe)); 633 iwe.cmd = SIOCGIWESSID; 634 iwe.u.data.length = ie[1]; 635 iwe.u.data.flags = 1; 636 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 637 &iwe, ie + 2); 638 break; 639 case WLAN_EID_MESH_ID: 640 memset(&iwe, 0, sizeof(iwe)); 641 iwe.cmd = SIOCGIWESSID; 642 iwe.u.data.length = ie[1]; 643 iwe.u.data.flags = 1; 644 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 645 &iwe, ie + 2); 646 break; 647 case WLAN_EID_MESH_CONFIG: 648 ismesh = true; 649 if (ie[1] != IEEE80211_MESH_CONFIG_LEN) 650 break; 651 buf = kmalloc(50, GFP_ATOMIC); 652 if (!buf) 653 break; 654 cfg = ie + 2; 655 memset(&iwe, 0, sizeof(iwe)); 656 iwe.cmd = IWEVCUSTOM; 657 sprintf(buf, "Mesh network (version %d)", cfg[0]); 658 iwe.u.data.length = strlen(buf); 659 current_ev = iwe_stream_add_point(info, current_ev, 660 end_buf, 661 &iwe, buf); 662 sprintf(buf, "Path Selection Protocol ID: " 663 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], 664 cfg[4]); 665 iwe.u.data.length = strlen(buf); 666 current_ev = iwe_stream_add_point(info, current_ev, 667 end_buf, 668 &iwe, buf); 669 sprintf(buf, "Path Selection Metric ID: " 670 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], 671 cfg[8]); 672 iwe.u.data.length = strlen(buf); 673 current_ev = iwe_stream_add_point(info, current_ev, 674 end_buf, 675 &iwe, buf); 676 sprintf(buf, "Congestion Control Mode ID: " 677 "0x%02X%02X%02X%02X", cfg[9], cfg[10], 678 cfg[11], cfg[12]); 679 iwe.u.data.length = strlen(buf); 680 current_ev = iwe_stream_add_point(info, current_ev, 681 end_buf, 682 &iwe, buf); 683 sprintf(buf, "Channel Precedence: " 684 "0x%02X%02X%02X%02X", cfg[13], cfg[14], 685 cfg[15], cfg[16]); 686 iwe.u.data.length = strlen(buf); 687 current_ev = iwe_stream_add_point(info, current_ev, 688 end_buf, 689 &iwe, buf); 690 kfree(buf); 691 break; 692 case WLAN_EID_SUPP_RATES: 693 case WLAN_EID_EXT_SUPP_RATES: 694 /* display all supported rates in readable format */ 695 p = current_ev + iwe_stream_lcp_len(info); 696 697 memset(&iwe, 0, sizeof(iwe)); 698 iwe.cmd = SIOCGIWRATE; 699 /* Those two flags are ignored... */ 700 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 701 702 for (i = 0; i < ie[1]; i++) { 703 iwe.u.bitrate.value = 704 ((ie[i + 2] & 0x7f) * 500000); 705 p = iwe_stream_add_value(info, current_ev, p, 706 end_buf, &iwe, IW_EV_PARAM_LEN); 707 } 708 current_ev = p; 709 break; 710 } 711 rem -= ie[1] + 2; 712 ie += ie[1] + 2; 713 } 714 715 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) 716 || ismesh) { 717 memset(&iwe, 0, sizeof(iwe)); 718 iwe.cmd = SIOCGIWMODE; 719 if (ismesh) 720 iwe.u.mode = IW_MODE_MESH; 721 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 722 iwe.u.mode = IW_MODE_MASTER; 723 else 724 iwe.u.mode = IW_MODE_ADHOC; 725 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 726 &iwe, IW_EV_UINT_LEN); 727 } 728 729 buf = kmalloc(30, GFP_ATOMIC); 730 if (buf) { 731 memset(&iwe, 0, sizeof(iwe)); 732 iwe.cmd = IWEVCUSTOM; 733 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 734 iwe.u.data.length = strlen(buf); 735 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 736 &iwe, buf); 737 memset(&iwe, 0, sizeof(iwe)); 738 iwe.cmd = IWEVCUSTOM; 739 sprintf(buf, " Last beacon: %dms ago", 740 jiffies_to_msecs(jiffies - bss->ts)); 741 iwe.u.data.length = strlen(buf); 742 current_ev = iwe_stream_add_point(info, current_ev, 743 end_buf, &iwe, buf); 744 kfree(buf); 745 } 746 747 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 748 749 return current_ev; 750} 751 752 753static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 754 struct iw_request_info *info, 755 char *buf, size_t len) 756{ 757 char *current_ev = buf; 758 char *end_buf = buf + len; 759 struct cfg80211_internal_bss *bss; 760 761 spin_lock_bh(&dev->bss_lock); 762 cfg80211_bss_expire(dev); 763 764 list_for_each_entry(bss, &dev->bss_list, list) { 765 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 766 spin_unlock_bh(&dev->bss_lock); 767 return -E2BIG; 768 } 769 current_ev = ieee80211_bss(info, bss, 770 current_ev, end_buf); 771 } 772 spin_unlock_bh(&dev->bss_lock); 773 return current_ev - buf; 774} 775 776 777int cfg80211_wext_giwscan(struct net_device *dev, 778 struct iw_request_info *info, 779 struct iw_point *data, char *extra) 780{ 781 struct cfg80211_registered_device *rdev; 782 int res; 783 784 if (!netif_running(dev)) 785 return -ENETDOWN; 786 787 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); 788 789 if (IS_ERR(rdev)) 790 return PTR_ERR(rdev); 791 792 if (rdev->scan_req) { 793 res = -EAGAIN; 794 goto out; 795 } 796 797 res = ieee80211_scan_results(rdev, info, extra, data->length); 798 data->length = 0; 799 if (res >= 0) { 800 data->length = res; 801 res = 0; 802 } 803 804 out: 805 cfg80211_put_dev(rdev); 806 return res; 807} 808EXPORT_SYMBOL(cfg80211_wext_giwscan); 809#endif 810