1 /* 2 * cfg80211 scan result handling 3 * 4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> 5 */ 6 #include <linux/kernel.h> 7 #include <linux/slab.h> 8 #include <linux/module.h> 9 #include <linux/netdevice.h> 10 #include <linux/wireless.h> 11 #include <linux/nl80211.h> 12 #include <linux/etherdevice.h> 13 #include <net/arp.h> 14 #include <net/cfg80211.h> 15 #include <net/cfg80211-wext.h> 16 #include <net/iw_handler.h> 17 #include "core.h" 18 #include "nl80211.h" 19 #include "wext-compat.h" 20 21 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) 22 23 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) 24 { 25 struct cfg80211_scan_request *request; 26 struct net_device *dev; 27 #ifdef CONFIG_CFG80211_WEXT 28 union iwreq_data wrqu; 29 #endif 30 31 ASSERT_RDEV_LOCK(rdev); 32 33 request = rdev->scan_req; 34 35 if (!request) 36 return; 37 38 dev = request->dev; 39 40 /* 41 * This must be before sending the other events! 42 * Otherwise, wpa_supplicant gets completely confused with 43 * wext events. 44 */ 45 cfg80211_sme_scan_done(dev); 46 47 if (request->aborted) 48 nl80211_send_scan_aborted(rdev, dev); 49 else 50 nl80211_send_scan_done(rdev, dev); 51 52 #ifdef CONFIG_CFG80211_WEXT 53 if (!request->aborted) { 54 memset(&wrqu, 0, sizeof(wrqu)); 55 56 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 57 } 58 #endif 59 60 dev_put(dev); 61 62 rdev->scan_req = NULL; 63 64 /* 65 * OK. If this is invoked with "leak" then we can't 66 * free this ... but we've cleaned it up anyway. The 67 * driver failed to call the scan_done callback, so 68 * all bets are off, it might still be trying to use 69 * the scan request or not ... if it accesses the dev 70 * in there (it shouldn't anyway) then it may crash. 71 */ 72 if (!leak) 73 kfree(request); 74 } 75 76 void __cfg80211_scan_done(struct work_struct *wk) 77 { 78 struct cfg80211_registered_device *rdev; 79 80 rdev = container_of(wk, struct cfg80211_registered_device, 81 scan_done_wk); 82 83 cfg80211_lock_rdev(rdev); 84 ___cfg80211_scan_done(rdev, false); 85 cfg80211_unlock_rdev(rdev); 86 } 87 88 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 89 { 90 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 91 92 request->aborted = aborted; 93 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); 94 } 95 EXPORT_SYMBOL(cfg80211_scan_done); 96 97 void __cfg80211_sched_scan_results(struct work_struct *wk) 98 { 99 struct cfg80211_registered_device *rdev; 100 101 rdev = container_of(wk, struct cfg80211_registered_device, 102 sched_scan_results_wk); 103 104 mutex_lock(&rdev->sched_scan_mtx); 105 106 /* we don't have sched_scan_req anymore if the scan is stopping */ 107 if (rdev->sched_scan_req) 108 nl80211_send_sched_scan_results(rdev, 109 rdev->sched_scan_req->dev); 110 111 mutex_unlock(&rdev->sched_scan_mtx); 112 } 113 114 void cfg80211_sched_scan_results(struct wiphy *wiphy) 115 { 116 /* ignore if we're not scanning */ 117 if (wiphy_to_dev(wiphy)->sched_scan_req) 118 queue_work(cfg80211_wq, 119 &wiphy_to_dev(wiphy)->sched_scan_results_wk); 120 } 121 EXPORT_SYMBOL(cfg80211_sched_scan_results); 122 123 void cfg80211_sched_scan_stopped(struct wiphy *wiphy) 124 { 125 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 126 127 mutex_lock(&rdev->sched_scan_mtx); 128 __cfg80211_stop_sched_scan(rdev, true); 129 mutex_unlock(&rdev->sched_scan_mtx); 130 } 131 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 132 133 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 134 bool driver_initiated) 135 { 136 struct net_device *dev; 137 138 lockdep_assert_held(&rdev->sched_scan_mtx); 139 140 if (!rdev->sched_scan_req) 141 return -ENOENT; 142 143 dev = rdev->sched_scan_req->dev; 144 145 if (!driver_initiated) { 146 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev); 147 if (err) 148 return err; 149 } 150 151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); 152 153 kfree(rdev->sched_scan_req); 154 rdev->sched_scan_req = NULL; 155 156 return 0; 157 } 158 159 static void bss_release(struct kref *ref) 160 { 161 struct cfg80211_internal_bss *bss; 162 163 bss = container_of(ref, struct cfg80211_internal_bss, ref); 164 if (bss->pub.free_priv) 165 bss->pub.free_priv(&bss->pub); 166 167 if (bss->beacon_ies_allocated) 168 kfree(bss->pub.beacon_ies); 169 if (bss->proberesp_ies_allocated) 170 kfree(bss->pub.proberesp_ies); 171 172 BUG_ON(atomic_read(&bss->hold)); 173 174 kfree(bss); 175 } 176 177 /* must hold dev->bss_lock! */ 178 void cfg80211_bss_age(struct cfg80211_registered_device *dev, 179 unsigned long age_secs) 180 { 181 struct cfg80211_internal_bss *bss; 182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 183 184 list_for_each_entry(bss, &dev->bss_list, list) { 185 bss->ts -= age_jiffies; 186 } 187 } 188 189 /* must hold dev->bss_lock! */ 190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, 191 struct cfg80211_internal_bss *bss) 192 { 193 list_del_init(&bss->list); 194 rb_erase(&bss->rbn, &dev->bss_tree); 195 kref_put(&bss->ref, bss_release); 196 } 197 198 /* must hold dev->bss_lock! */ 199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 200 { 201 struct cfg80211_internal_bss *bss, *tmp; 202 bool expired = false; 203 204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 205 if (atomic_read(&bss->hold)) 206 continue; 207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 208 continue; 209 __cfg80211_unlink_bss(dev, bss); 210 expired = true; 211 } 212 213 if (expired) 214 dev->bss_generation++; 215 } 216 217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) 218 { 219 while (len > 2 && ies[0] != eid) { 220 len -= ies[1] + 2; 221 ies += ies[1] + 2; 222 } 223 if (len < 2) 224 return NULL; 225 if (len < 2 + ies[1]) 226 return NULL; 227 return ies; 228 } 229 EXPORT_SYMBOL(cfg80211_find_ie); 230 231 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, 232 const u8 *ies, int len) 233 { 234 struct ieee80211_vendor_ie *ie; 235 const u8 *pos = ies, *end = ies + len; 236 int ie_oui; 237 238 while (pos < end) { 239 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, 240 end - pos); 241 if (!pos) 242 return NULL; 243 244 if (end - pos < sizeof(*ie)) 245 return NULL; 246 247 ie = (struct ieee80211_vendor_ie *)pos; 248 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; 249 if (ie_oui == oui && ie->oui_type == oui_type) 250 return pos; 251 252 pos += 2 + ie->len; 253 } 254 return NULL; 255 } 256 EXPORT_SYMBOL(cfg80211_find_vendor_ie); 257 258 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 259 { 260 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); 261 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); 262 263 /* equal if both missing */ 264 if (!ie1 && !ie2) 265 return 0; 266 /* sort missing IE before (left of) present IE */ 267 if (!ie1) 268 return -1; 269 if (!ie2) 270 return 1; 271 272 /* sort by length first, then by contents */ 273 if (ie1[1] != ie2[1]) 274 return ie2[1] - ie1[1]; 275 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 276 } 277 278 static bool is_bss(struct cfg80211_bss *a, 279 const u8 *bssid, 280 const u8 *ssid, size_t ssid_len) 281 { 282 const u8 *ssidie; 283 284 if (bssid && compare_ether_addr(a->bssid, bssid)) 285 return false; 286 287 if (!ssid) 288 return true; 289 290 ssidie = cfg80211_find_ie(WLAN_EID_SSID, 291 a->information_elements, 292 a->len_information_elements); 293 if (!ssidie) 294 return false; 295 if (ssidie[1] != ssid_len) 296 return false; 297 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 298 } 299 300 static bool is_mesh_bss(struct cfg80211_bss *a) 301 { 302 const u8 *ie; 303 304 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 305 return false; 306 307 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 308 a->information_elements, 309 a->len_information_elements); 310 if (!ie) 311 return false; 312 313 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 314 a->information_elements, 315 a->len_information_elements); 316 if (!ie) 317 return false; 318 319 return true; 320 } 321 322 static bool is_mesh(struct cfg80211_bss *a, 323 const u8 *meshid, size_t meshidlen, 324 const u8 *meshcfg) 325 { 326 const u8 *ie; 327 328 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 329 return false; 330 331 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 332 a->information_elements, 333 a->len_information_elements); 334 if (!ie) 335 return false; 336 if (ie[1] != meshidlen) 337 return false; 338 if (memcmp(ie + 2, meshid, meshidlen)) 339 return false; 340 341 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 342 a->information_elements, 343 a->len_information_elements); 344 if (!ie) 345 return false; 346 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 347 return false; 348 349 /* 350 * Ignore mesh capability (last two bytes of the IE) when 351 * comparing since that may differ between stations taking 352 * part in the same mesh. 353 */ 354 return memcmp(ie + 2, meshcfg, 355 sizeof(struct ieee80211_meshconf_ie) - 2) == 0; 356 } 357 358 static int cmp_bss(struct cfg80211_bss *a, 359 struct cfg80211_bss *b) 360 { 361 int r; 362 363 if (a->channel != b->channel) 364 return b->channel->center_freq - a->channel->center_freq; 365 366 if (is_mesh_bss(a) && is_mesh_bss(b)) { 367 r = cmp_ies(WLAN_EID_MESH_ID, 368 a->information_elements, 369 a->len_information_elements, 370 b->information_elements, 371 b->len_information_elements); 372 if (r) 373 return r; 374 return cmp_ies(WLAN_EID_MESH_CONFIG, 375 a->information_elements, 376 a->len_information_elements, 377 b->information_elements, 378 b->len_information_elements); 379 } 380 381 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 382 if (r) 383 return r; 384 385 return cmp_ies(WLAN_EID_SSID, 386 a->information_elements, 387 a->len_information_elements, 388 b->information_elements, 389 b->len_information_elements); 390 } 391 392 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 393 struct ieee80211_channel *channel, 394 const u8 *bssid, 395 const u8 *ssid, size_t ssid_len, 396 u16 capa_mask, u16 capa_val) 397 { 398 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 399 struct cfg80211_internal_bss *bss, *res = NULL; 400 unsigned long now = jiffies; 401 402 spin_lock_bh(&dev->bss_lock); 403 404 list_for_each_entry(bss, &dev->bss_list, list) { 405 if ((bss->pub.capability & capa_mask) != capa_val) 406 continue; 407 if (channel && bss->pub.channel != channel) 408 continue; 409 /* Don't get expired BSS structs */ 410 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 411 !atomic_read(&bss->hold)) 412 continue; 413 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 414 res = bss; 415 kref_get(&res->ref); 416 break; 417 } 418 } 419 420 spin_unlock_bh(&dev->bss_lock); 421 if (!res) 422 return NULL; 423 return &res->pub; 424 } 425 EXPORT_SYMBOL(cfg80211_get_bss); 426 427 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 428 struct ieee80211_channel *channel, 429 const u8 *meshid, size_t meshidlen, 430 const u8 *meshcfg) 431 { 432 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 433 struct cfg80211_internal_bss *bss, *res = NULL; 434 435 spin_lock_bh(&dev->bss_lock); 436 437 list_for_each_entry(bss, &dev->bss_list, list) { 438 if (channel && bss->pub.channel != channel) 439 continue; 440 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 441 res = bss; 442 kref_get(&res->ref); 443 break; 444 } 445 } 446 447 spin_unlock_bh(&dev->bss_lock); 448 if (!res) 449 return NULL; 450 return &res->pub; 451 } 452 EXPORT_SYMBOL(cfg80211_get_mesh); 453 454 455 static void rb_insert_bss(struct cfg80211_registered_device *dev, 456 struct cfg80211_internal_bss *bss) 457 { 458 struct rb_node **p = &dev->bss_tree.rb_node; 459 struct rb_node *parent = NULL; 460 struct cfg80211_internal_bss *tbss; 461 int cmp; 462 463 while (*p) { 464 parent = *p; 465 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 466 467 cmp = cmp_bss(&bss->pub, &tbss->pub); 468 469 if (WARN_ON(!cmp)) { 470 /* will sort of leak this BSS */ 471 return; 472 } 473 474 if (cmp < 0) 475 p = &(*p)->rb_left; 476 else 477 p = &(*p)->rb_right; 478 } 479 480 rb_link_node(&bss->rbn, parent, p); 481 rb_insert_color(&bss->rbn, &dev->bss_tree); 482 } 483 484 static struct cfg80211_internal_bss * 485 rb_find_bss(struct cfg80211_registered_device *dev, 486 struct cfg80211_internal_bss *res) 487 { 488 struct rb_node *n = dev->bss_tree.rb_node; 489 struct cfg80211_internal_bss *bss; 490 int r; 491 492 while (n) { 493 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 494 r = cmp_bss(&res->pub, &bss->pub); 495 496 if (r == 0) 497 return bss; 498 else if (r < 0) 499 n = n->rb_left; 500 else 501 n = n->rb_right; 502 } 503 504 return NULL; 505 } 506 507 static struct cfg80211_internal_bss * 508 cfg80211_bss_update(struct cfg80211_registered_device *dev, 509 struct cfg80211_internal_bss *res) 510 { 511 struct cfg80211_internal_bss *found = NULL; 512 513 /* 514 * The reference to "res" is donated to this function. 515 */ 516 517 if (WARN_ON(!res->pub.channel)) { 518 kref_put(&res->ref, bss_release); 519 return NULL; 520 } 521 522 res->ts = jiffies; 523 524 spin_lock_bh(&dev->bss_lock); 525 526 found = rb_find_bss(dev, res); 527 528 if (found) { 529 found->pub.beacon_interval = res->pub.beacon_interval; 530 found->pub.tsf = res->pub.tsf; 531 found->pub.signal = res->pub.signal; 532 found->pub.capability = res->pub.capability; 533 found->ts = res->ts; 534 535 /* Update IEs */ 536 if (res->pub.proberesp_ies) { 537 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 538 size_t ielen = res->pub.len_proberesp_ies; 539 540 if (found->pub.proberesp_ies && 541 !found->proberesp_ies_allocated && 542 ksize(found) >= used + ielen) { 543 memcpy(found->pub.proberesp_ies, 544 res->pub.proberesp_ies, ielen); 545 found->pub.len_proberesp_ies = ielen; 546 } else { 547 u8 *ies = found->pub.proberesp_ies; 548 549 if (found->proberesp_ies_allocated) 550 ies = krealloc(ies, ielen, GFP_ATOMIC); 551 else 552 ies = kmalloc(ielen, GFP_ATOMIC); 553 554 if (ies) { 555 memcpy(ies, res->pub.proberesp_ies, 556 ielen); 557 found->proberesp_ies_allocated = true; 558 found->pub.proberesp_ies = ies; 559 found->pub.len_proberesp_ies = ielen; 560 } 561 } 562 563 /* Override possible earlier Beacon frame IEs */ 564 found->pub.information_elements = 565 found->pub.proberesp_ies; 566 found->pub.len_information_elements = 567 found->pub.len_proberesp_ies; 568 } 569 if (res->pub.beacon_ies) { 570 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 571 size_t ielen = res->pub.len_beacon_ies; 572 bool information_elements_is_beacon_ies = 573 (found->pub.information_elements == 574 found->pub.beacon_ies); 575 576 if (found->pub.beacon_ies && 577 !found->beacon_ies_allocated && 578 ksize(found) >= used + ielen) { 579 memcpy(found->pub.beacon_ies, 580 res->pub.beacon_ies, ielen); 581 found->pub.len_beacon_ies = ielen; 582 } else { 583 u8 *ies = found->pub.beacon_ies; 584 585 if (found->beacon_ies_allocated) 586 ies = krealloc(ies, ielen, GFP_ATOMIC); 587 else 588 ies = kmalloc(ielen, GFP_ATOMIC); 589 590 if (ies) { 591 memcpy(ies, res->pub.beacon_ies, 592 ielen); 593 found->beacon_ies_allocated = true; 594 found->pub.beacon_ies = ies; 595 found->pub.len_beacon_ies = ielen; 596 } 597 } 598 599 /* Override IEs if they were from a beacon before */ 600 if (information_elements_is_beacon_ies) { 601 found->pub.information_elements = 602 found->pub.beacon_ies; 603 found->pub.len_information_elements = 604 found->pub.len_beacon_ies; 605 } 606 } 607 608 kref_put(&res->ref, bss_release); 609 } else { 610 /* this "consumes" the reference */ 611 list_add_tail(&res->list, &dev->bss_list); 612 rb_insert_bss(dev, res); 613 found = res; 614 } 615 616 dev->bss_generation++; 617 spin_unlock_bh(&dev->bss_lock); 618 619 kref_get(&found->ref); 620 return found; 621 } 622 623 struct cfg80211_bss* 624 cfg80211_inform_bss(struct wiphy *wiphy, 625 struct ieee80211_channel *channel, 626 const u8 *bssid, 627 u64 timestamp, u16 capability, u16 beacon_interval, 628 const u8 *ie, size_t ielen, 629 s32 signal, gfp_t gfp) 630 { 631 struct cfg80211_internal_bss *res; 632 size_t privsz; 633 634 if (WARN_ON(!wiphy)) 635 return NULL; 636 637 privsz = wiphy->bss_priv_size; 638 639 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 640 (signal < 0 || signal > 100))) 641 return NULL; 642 643 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 644 if (!res) 645 return NULL; 646 647 memcpy(res->pub.bssid, bssid, ETH_ALEN); 648 res->pub.channel = channel; 649 res->pub.signal = signal; 650 res->pub.tsf = timestamp; 651 res->pub.beacon_interval = beacon_interval; 652 res->pub.capability = capability; 653 /* 654 * Since we do not know here whether the IEs are from a Beacon or Probe 655 * Response frame, we need to pick one of the options and only use it 656 * with the driver that does not provide the full Beacon/Probe Response 657 * frame. Use Beacon frame pointer to avoid indicating that this should 658 * override the information_elements pointer should we have received an 659 * earlier indication of Probe Response data. 660 * 661 * The initial buffer for the IEs is allocated with the BSS entry and 662 * is located after the private area. 663 */ 664 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 665 memcpy(res->pub.beacon_ies, ie, ielen); 666 res->pub.len_beacon_ies = ielen; 667 res->pub.information_elements = res->pub.beacon_ies; 668 res->pub.len_information_elements = res->pub.len_beacon_ies; 669 670 kref_init(&res->ref); 671 672 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 673 if (!res) 674 return NULL; 675 676 if (res->pub.capability & WLAN_CAPABILITY_ESS) 677 regulatory_hint_found_beacon(wiphy, channel, gfp); 678 679 /* cfg80211_bss_update gives us a referenced result */ 680 return &res->pub; 681 } 682 EXPORT_SYMBOL(cfg80211_inform_bss); 683 684 struct cfg80211_bss * 685 cfg80211_inform_bss_frame(struct wiphy *wiphy, 686 struct ieee80211_channel *channel, 687 struct ieee80211_mgmt *mgmt, size_t len, 688 s32 signal, gfp_t gfp) 689 { 690 struct cfg80211_internal_bss *res; 691 size_t ielen = len - offsetof(struct ieee80211_mgmt, 692 u.probe_resp.variable); 693 size_t privsz; 694 695 if (WARN_ON(!mgmt)) 696 return NULL; 697 698 if (WARN_ON(!wiphy)) 699 return NULL; 700 701 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 702 (signal < 0 || signal > 100))) 703 return NULL; 704 705 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 706 return NULL; 707 708 privsz = wiphy->bss_priv_size; 709 710 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 711 if (!res) 712 return NULL; 713 714 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 715 res->pub.channel = channel; 716 res->pub.signal = signal; 717 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 718 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 719 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 720 /* 721 * The initial buffer for the IEs is allocated with the BSS entry and 722 * is located after the private area. 723 */ 724 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 725 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 726 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 727 ielen); 728 res->pub.len_proberesp_ies = ielen; 729 res->pub.information_elements = res->pub.proberesp_ies; 730 res->pub.len_information_elements = res->pub.len_proberesp_ies; 731 } else { 732 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 733 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 734 res->pub.len_beacon_ies = ielen; 735 res->pub.information_elements = res->pub.beacon_ies; 736 res->pub.len_information_elements = res->pub.len_beacon_ies; 737 } 738 739 kref_init(&res->ref); 740 741 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 742 if (!res) 743 return NULL; 744 745 if (res->pub.capability & WLAN_CAPABILITY_ESS) 746 regulatory_hint_found_beacon(wiphy, channel, gfp); 747 748 /* cfg80211_bss_update gives us a referenced result */ 749 return &res->pub; 750 } 751 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 752 753 void cfg80211_put_bss(struct cfg80211_bss *pub) 754 { 755 struct cfg80211_internal_bss *bss; 756 757 if (!pub) 758 return; 759 760 bss = container_of(pub, struct cfg80211_internal_bss, pub); 761 kref_put(&bss->ref, bss_release); 762 } 763 EXPORT_SYMBOL(cfg80211_put_bss); 764 765 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 766 { 767 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 768 struct cfg80211_internal_bss *bss; 769 770 if (WARN_ON(!pub)) 771 return; 772 773 bss = container_of(pub, struct cfg80211_internal_bss, pub); 774 775 spin_lock_bh(&dev->bss_lock); 776 if (!list_empty(&bss->list)) { 777 __cfg80211_unlink_bss(dev, bss); 778 dev->bss_generation++; 779 } 780 spin_unlock_bh(&dev->bss_lock); 781 } 782 EXPORT_SYMBOL(cfg80211_unlink_bss); 783 784 #ifdef CONFIG_CFG80211_WEXT 785 int cfg80211_wext_siwscan(struct net_device *dev, 786 struct iw_request_info *info, 787 union iwreq_data *wrqu, char *extra) 788 { 789 struct cfg80211_registered_device *rdev; 790 struct wiphy *wiphy; 791 struct iw_scan_req *wreq = NULL; 792 struct cfg80211_scan_request *creq = NULL; 793 int i, err, n_channels = 0; 794 enum ieee80211_band band; 795 796 if (!netif_running(dev)) 797 return -ENETDOWN; 798 799 if (wrqu->data.length == sizeof(struct iw_scan_req)) 800 wreq = (struct iw_scan_req *)extra; 801 802 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 803 804 if (IS_ERR(rdev)) 805 return PTR_ERR(rdev); 806 807 if (rdev->scan_req) { 808 err = -EBUSY; 809 goto out; 810 } 811 812 wiphy = &rdev->wiphy; 813 814 /* Determine number of channels, needed to allocate creq */ 815 if (wreq && wreq->num_channels) 816 n_channels = wreq->num_channels; 817 else { 818 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 819 if (wiphy->bands[band]) 820 n_channels += wiphy->bands[band]->n_channels; 821 } 822 823 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 824 n_channels * sizeof(void *), 825 GFP_ATOMIC); 826 if (!creq) { 827 err = -ENOMEM; 828 goto out; 829 } 830 831 creq->wiphy = wiphy; 832 creq->dev = dev; 833 /* SSIDs come after channels */ 834 creq->ssids = (void *)&creq->channels[n_channels]; 835 creq->n_channels = n_channels; 836 creq->n_ssids = 1; 837 838 /* translate "Scan on frequencies" request */ 839 i = 0; 840 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 841 int j; 842 843 if (!wiphy->bands[band]) 844 continue; 845 846 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 847 /* ignore disabled channels */ 848 if (wiphy->bands[band]->channels[j].flags & 849 IEEE80211_CHAN_DISABLED) 850 continue; 851 852 /* If we have a wireless request structure and the 853 * wireless request specifies frequencies, then search 854 * for the matching hardware channel. 855 */ 856 if (wreq && wreq->num_channels) { 857 int k; 858 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 859 for (k = 0; k < wreq->num_channels; k++) { 860 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 861 if (wext_freq == wiphy_freq) 862 goto wext_freq_found; 863 } 864 goto wext_freq_not_found; 865 } 866 867 wext_freq_found: 868 creq->channels[i] = &wiphy->bands[band]->channels[j]; 869 i++; 870 wext_freq_not_found: ; 871 } 872 } 873 /* No channels found? */ 874 if (!i) { 875 err = -EINVAL; 876 goto out; 877 } 878 879 /* Set real number of channels specified in creq->channels[] */ 880 creq->n_channels = i; 881 882 /* translate "Scan for SSID" request */ 883 if (wreq) { 884 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 885 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 886 err = -EINVAL; 887 goto out; 888 } 889 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 890 creq->ssids[0].ssid_len = wreq->essid_len; 891 } 892 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 893 creq->n_ssids = 0; 894 } 895 896 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 897 if (wiphy->bands[i]) 898 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 899 900 rdev->scan_req = creq; 901 err = rdev->ops->scan(wiphy, dev, creq); 902 if (err) { 903 rdev->scan_req = NULL; 904 /* creq will be freed below */ 905 } else { 906 nl80211_send_scan_start(rdev, dev); 907 /* creq now owned by driver */ 908 creq = NULL; 909 dev_hold(dev); 910 } 911 out: 912 kfree(creq); 913 cfg80211_unlock_rdev(rdev); 914 return err; 915 } 916 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 917 918 static void ieee80211_scan_add_ies(struct iw_request_info *info, 919 struct cfg80211_bss *bss, 920 char **current_ev, char *end_buf) 921 { 922 u8 *pos, *end, *next; 923 struct iw_event iwe; 924 925 if (!bss->information_elements || 926 !bss->len_information_elements) 927 return; 928 929 /* 930 * If needed, fragment the IEs buffer (at IE boundaries) into short 931 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 932 */ 933 pos = bss->information_elements; 934 end = pos + bss->len_information_elements; 935 936 while (end - pos > IW_GENERIC_IE_MAX) { 937 next = pos + 2 + pos[1]; 938 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 939 next = next + 2 + next[1]; 940 941 memset(&iwe, 0, sizeof(iwe)); 942 iwe.cmd = IWEVGENIE; 943 iwe.u.data.length = next - pos; 944 *current_ev = iwe_stream_add_point(info, *current_ev, 945 end_buf, &iwe, pos); 946 947 pos = next; 948 } 949 950 if (end > pos) { 951 memset(&iwe, 0, sizeof(iwe)); 952 iwe.cmd = IWEVGENIE; 953 iwe.u.data.length = end - pos; 954 *current_ev = iwe_stream_add_point(info, *current_ev, 955 end_buf, &iwe, pos); 956 } 957 } 958 959 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 960 { 961 unsigned long end = jiffies; 962 963 if (end >= start) 964 return jiffies_to_msecs(end - start); 965 966 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 967 } 968 969 static char * 970 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 971 struct cfg80211_internal_bss *bss, char *current_ev, 972 char *end_buf) 973 { 974 struct iw_event iwe; 975 u8 *buf, *cfg, *p; 976 u8 *ie = bss->pub.information_elements; 977 int rem = bss->pub.len_information_elements, i, sig; 978 bool ismesh = false; 979 980 memset(&iwe, 0, sizeof(iwe)); 981 iwe.cmd = SIOCGIWAP; 982 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 983 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 984 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 985 IW_EV_ADDR_LEN); 986 987 memset(&iwe, 0, sizeof(iwe)); 988 iwe.cmd = SIOCGIWFREQ; 989 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 990 iwe.u.freq.e = 0; 991 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 992 IW_EV_FREQ_LEN); 993 994 memset(&iwe, 0, sizeof(iwe)); 995 iwe.cmd = SIOCGIWFREQ; 996 iwe.u.freq.m = bss->pub.channel->center_freq; 997 iwe.u.freq.e = 6; 998 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 999 IW_EV_FREQ_LEN); 1000 1001 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1002 memset(&iwe, 0, sizeof(iwe)); 1003 iwe.cmd = IWEVQUAL; 1004 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1005 IW_QUAL_NOISE_INVALID | 1006 IW_QUAL_QUAL_UPDATED; 1007 switch (wiphy->signal_type) { 1008 case CFG80211_SIGNAL_TYPE_MBM: 1009 sig = bss->pub.signal / 100; 1010 iwe.u.qual.level = sig; 1011 iwe.u.qual.updated |= IW_QUAL_DBM; 1012 if (sig < -110) /* rather bad */ 1013 sig = -110; 1014 else if (sig > -40) /* perfect */ 1015 sig = -40; 1016 /* will give a range of 0 .. 70 */ 1017 iwe.u.qual.qual = sig + 110; 1018 break; 1019 case CFG80211_SIGNAL_TYPE_UNSPEC: 1020 iwe.u.qual.level = bss->pub.signal; 1021 /* will give range 0 .. 100 */ 1022 iwe.u.qual.qual = bss->pub.signal; 1023 break; 1024 default: 1025 /* not reached */ 1026 break; 1027 } 1028 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1029 &iwe, IW_EV_QUAL_LEN); 1030 } 1031 1032 memset(&iwe, 0, sizeof(iwe)); 1033 iwe.cmd = SIOCGIWENCODE; 1034 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1035 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1036 else 1037 iwe.u.data.flags = IW_ENCODE_DISABLED; 1038 iwe.u.data.length = 0; 1039 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1040 &iwe, ""); 1041 1042 while (rem >= 2) { 1043 /* invalid data */ 1044 if (ie[1] > rem - 2) 1045 break; 1046 1047 switch (ie[0]) { 1048 case WLAN_EID_SSID: 1049 memset(&iwe, 0, sizeof(iwe)); 1050 iwe.cmd = SIOCGIWESSID; 1051 iwe.u.data.length = ie[1]; 1052 iwe.u.data.flags = 1; 1053 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1054 &iwe, ie + 2); 1055 break; 1056 case WLAN_EID_MESH_ID: 1057 memset(&iwe, 0, sizeof(iwe)); 1058 iwe.cmd = SIOCGIWESSID; 1059 iwe.u.data.length = ie[1]; 1060 iwe.u.data.flags = 1; 1061 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1062 &iwe, ie + 2); 1063 break; 1064 case WLAN_EID_MESH_CONFIG: 1065 ismesh = true; 1066 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1067 break; 1068 buf = kmalloc(50, GFP_ATOMIC); 1069 if (!buf) 1070 break; 1071 cfg = ie + 2; 1072 memset(&iwe, 0, sizeof(iwe)); 1073 iwe.cmd = IWEVCUSTOM; 1074 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1075 "0x%02X", cfg[0]); 1076 iwe.u.data.length = strlen(buf); 1077 current_ev = iwe_stream_add_point(info, current_ev, 1078 end_buf, 1079 &iwe, buf); 1080 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1081 cfg[1]); 1082 iwe.u.data.length = strlen(buf); 1083 current_ev = iwe_stream_add_point(info, current_ev, 1084 end_buf, 1085 &iwe, buf); 1086 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1087 cfg[2]); 1088 iwe.u.data.length = strlen(buf); 1089 current_ev = iwe_stream_add_point(info, current_ev, 1090 end_buf, 1091 &iwe, buf); 1092 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1093 iwe.u.data.length = strlen(buf); 1094 current_ev = iwe_stream_add_point(info, current_ev, 1095 end_buf, 1096 &iwe, buf); 1097 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1098 iwe.u.data.length = strlen(buf); 1099 current_ev = iwe_stream_add_point(info, current_ev, 1100 end_buf, 1101 &iwe, buf); 1102 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1103 iwe.u.data.length = strlen(buf); 1104 current_ev = iwe_stream_add_point(info, current_ev, 1105 end_buf, 1106 &iwe, buf); 1107 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1108 iwe.u.data.length = strlen(buf); 1109 current_ev = iwe_stream_add_point(info, current_ev, 1110 end_buf, 1111 &iwe, buf); 1112 kfree(buf); 1113 break; 1114 case WLAN_EID_SUPP_RATES: 1115 case WLAN_EID_EXT_SUPP_RATES: 1116 /* display all supported rates in readable format */ 1117 p = current_ev + iwe_stream_lcp_len(info); 1118 1119 memset(&iwe, 0, sizeof(iwe)); 1120 iwe.cmd = SIOCGIWRATE; 1121 /* Those two flags are ignored... */ 1122 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1123 1124 for (i = 0; i < ie[1]; i++) { 1125 iwe.u.bitrate.value = 1126 ((ie[i + 2] & 0x7f) * 500000); 1127 p = iwe_stream_add_value(info, current_ev, p, 1128 end_buf, &iwe, IW_EV_PARAM_LEN); 1129 } 1130 current_ev = p; 1131 break; 1132 } 1133 rem -= ie[1] + 2; 1134 ie += ie[1] + 2; 1135 } 1136 1137 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1138 ismesh) { 1139 memset(&iwe, 0, sizeof(iwe)); 1140 iwe.cmd = SIOCGIWMODE; 1141 if (ismesh) 1142 iwe.u.mode = IW_MODE_MESH; 1143 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1144 iwe.u.mode = IW_MODE_MASTER; 1145 else 1146 iwe.u.mode = IW_MODE_ADHOC; 1147 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1148 &iwe, IW_EV_UINT_LEN); 1149 } 1150 1151 buf = kmalloc(30, GFP_ATOMIC); 1152 if (buf) { 1153 memset(&iwe, 0, sizeof(iwe)); 1154 iwe.cmd = IWEVCUSTOM; 1155 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1156 iwe.u.data.length = strlen(buf); 1157 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1158 &iwe, buf); 1159 memset(&iwe, 0, sizeof(iwe)); 1160 iwe.cmd = IWEVCUSTOM; 1161 sprintf(buf, " Last beacon: %ums ago", 1162 elapsed_jiffies_msecs(bss->ts)); 1163 iwe.u.data.length = strlen(buf); 1164 current_ev = iwe_stream_add_point(info, current_ev, 1165 end_buf, &iwe, buf); 1166 kfree(buf); 1167 } 1168 1169 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1170 1171 return current_ev; 1172 } 1173 1174 1175 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1176 struct iw_request_info *info, 1177 char *buf, size_t len) 1178 { 1179 char *current_ev = buf; 1180 char *end_buf = buf + len; 1181 struct cfg80211_internal_bss *bss; 1182 1183 spin_lock_bh(&dev->bss_lock); 1184 cfg80211_bss_expire(dev); 1185 1186 list_for_each_entry(bss, &dev->bss_list, list) { 1187 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1188 spin_unlock_bh(&dev->bss_lock); 1189 return -E2BIG; 1190 } 1191 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1192 current_ev, end_buf); 1193 } 1194 spin_unlock_bh(&dev->bss_lock); 1195 return current_ev - buf; 1196 } 1197 1198 1199 int cfg80211_wext_giwscan(struct net_device *dev, 1200 struct iw_request_info *info, 1201 struct iw_point *data, char *extra) 1202 { 1203 struct cfg80211_registered_device *rdev; 1204 int res; 1205 1206 if (!netif_running(dev)) 1207 return -ENETDOWN; 1208 1209 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1210 1211 if (IS_ERR(rdev)) 1212 return PTR_ERR(rdev); 1213 1214 if (rdev->scan_req) { 1215 res = -EAGAIN; 1216 goto out; 1217 } 1218 1219 res = ieee80211_scan_results(rdev, info, extra, data->length); 1220 data->length = 0; 1221 if (res >= 0) { 1222 data->length = res; 1223 res = 0; 1224 } 1225 1226 out: 1227 cfg80211_unlock_rdev(rdev); 1228 return res; 1229 } 1230 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1231 #endif 1232