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 int r; 263 264 if (!ie1 && !ie2) 265 return 0; 266 if (!ie1 || !ie2) 267 return -1; 268 269 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 270 if (r == 0 && ie1[1] != ie2[1]) 271 return ie2[1] - ie1[1]; 272 return r; 273 } 274 275 static bool is_bss(struct cfg80211_bss *a, 276 const u8 *bssid, 277 const u8 *ssid, size_t ssid_len) 278 { 279 const u8 *ssidie; 280 281 if (bssid && compare_ether_addr(a->bssid, bssid)) 282 return false; 283 284 if (!ssid) 285 return true; 286 287 ssidie = cfg80211_find_ie(WLAN_EID_SSID, 288 a->information_elements, 289 a->len_information_elements); 290 if (!ssidie) 291 return false; 292 if (ssidie[1] != ssid_len) 293 return false; 294 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 295 } 296 297 static bool is_mesh_bss(struct cfg80211_bss *a) 298 { 299 const u8 *ie; 300 301 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 302 return false; 303 304 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 305 a->information_elements, 306 a->len_information_elements); 307 if (!ie) 308 return false; 309 310 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 311 a->information_elements, 312 a->len_information_elements); 313 if (!ie) 314 return false; 315 316 return true; 317 } 318 319 static bool is_mesh(struct cfg80211_bss *a, 320 const u8 *meshid, size_t meshidlen, 321 const u8 *meshcfg) 322 { 323 const u8 *ie; 324 325 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 326 return false; 327 328 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 329 a->information_elements, 330 a->len_information_elements); 331 if (!ie) 332 return false; 333 if (ie[1] != meshidlen) 334 return false; 335 if (memcmp(ie + 2, meshid, meshidlen)) 336 return false; 337 338 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 339 a->information_elements, 340 a->len_information_elements); 341 if (!ie) 342 return false; 343 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 344 return false; 345 346 /* 347 * Ignore mesh capability (last two bytes of the IE) when 348 * comparing since that may differ between stations taking 349 * part in the same mesh. 350 */ 351 return memcmp(ie + 2, meshcfg, 352 sizeof(struct ieee80211_meshconf_ie) - 2) == 0; 353 } 354 355 static int cmp_bss(struct cfg80211_bss *a, 356 struct cfg80211_bss *b) 357 { 358 int r; 359 360 if (a->channel != b->channel) 361 return b->channel->center_freq - a->channel->center_freq; 362 363 if (is_mesh_bss(a) && is_mesh_bss(b)) { 364 r = cmp_ies(WLAN_EID_MESH_ID, 365 a->information_elements, 366 a->len_information_elements, 367 b->information_elements, 368 b->len_information_elements); 369 if (r) 370 return r; 371 return cmp_ies(WLAN_EID_MESH_CONFIG, 372 a->information_elements, 373 a->len_information_elements, 374 b->information_elements, 375 b->len_information_elements); 376 } 377 378 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 379 if (r) 380 return r; 381 382 return cmp_ies(WLAN_EID_SSID, 383 a->information_elements, 384 a->len_information_elements, 385 b->information_elements, 386 b->len_information_elements); 387 } 388 389 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 390 struct ieee80211_channel *channel, 391 const u8 *bssid, 392 const u8 *ssid, size_t ssid_len, 393 u16 capa_mask, u16 capa_val) 394 { 395 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 396 struct cfg80211_internal_bss *bss, *res = NULL; 397 unsigned long now = jiffies; 398 399 spin_lock_bh(&dev->bss_lock); 400 401 list_for_each_entry(bss, &dev->bss_list, list) { 402 if ((bss->pub.capability & capa_mask) != capa_val) 403 continue; 404 if (channel && bss->pub.channel != channel) 405 continue; 406 /* Don't get expired BSS structs */ 407 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 408 !atomic_read(&bss->hold)) 409 continue; 410 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 411 res = bss; 412 kref_get(&res->ref); 413 break; 414 } 415 } 416 417 spin_unlock_bh(&dev->bss_lock); 418 if (!res) 419 return NULL; 420 return &res->pub; 421 } 422 EXPORT_SYMBOL(cfg80211_get_bss); 423 424 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 425 struct ieee80211_channel *channel, 426 const u8 *meshid, size_t meshidlen, 427 const u8 *meshcfg) 428 { 429 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 430 struct cfg80211_internal_bss *bss, *res = NULL; 431 432 spin_lock_bh(&dev->bss_lock); 433 434 list_for_each_entry(bss, &dev->bss_list, list) { 435 if (channel && bss->pub.channel != channel) 436 continue; 437 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 438 res = bss; 439 kref_get(&res->ref); 440 break; 441 } 442 } 443 444 spin_unlock_bh(&dev->bss_lock); 445 if (!res) 446 return NULL; 447 return &res->pub; 448 } 449 EXPORT_SYMBOL(cfg80211_get_mesh); 450 451 452 static void rb_insert_bss(struct cfg80211_registered_device *dev, 453 struct cfg80211_internal_bss *bss) 454 { 455 struct rb_node **p = &dev->bss_tree.rb_node; 456 struct rb_node *parent = NULL; 457 struct cfg80211_internal_bss *tbss; 458 int cmp; 459 460 while (*p) { 461 parent = *p; 462 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 463 464 cmp = cmp_bss(&bss->pub, &tbss->pub); 465 466 if (WARN_ON(!cmp)) { 467 /* will sort of leak this BSS */ 468 return; 469 } 470 471 if (cmp < 0) 472 p = &(*p)->rb_left; 473 else 474 p = &(*p)->rb_right; 475 } 476 477 rb_link_node(&bss->rbn, parent, p); 478 rb_insert_color(&bss->rbn, &dev->bss_tree); 479 } 480 481 static struct cfg80211_internal_bss * 482 rb_find_bss(struct cfg80211_registered_device *dev, 483 struct cfg80211_internal_bss *res) 484 { 485 struct rb_node *n = dev->bss_tree.rb_node; 486 struct cfg80211_internal_bss *bss; 487 int r; 488 489 while (n) { 490 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 491 r = cmp_bss(&res->pub, &bss->pub); 492 493 if (r == 0) 494 return bss; 495 else if (r < 0) 496 n = n->rb_left; 497 else 498 n = n->rb_right; 499 } 500 501 return NULL; 502 } 503 504 static struct cfg80211_internal_bss * 505 cfg80211_bss_update(struct cfg80211_registered_device *dev, 506 struct cfg80211_internal_bss *res) 507 { 508 struct cfg80211_internal_bss *found = NULL; 509 510 /* 511 * The reference to "res" is donated to this function. 512 */ 513 514 if (WARN_ON(!res->pub.channel)) { 515 kref_put(&res->ref, bss_release); 516 return NULL; 517 } 518 519 res->ts = jiffies; 520 521 spin_lock_bh(&dev->bss_lock); 522 523 found = rb_find_bss(dev, res); 524 525 if (found) { 526 found->pub.beacon_interval = res->pub.beacon_interval; 527 found->pub.tsf = res->pub.tsf; 528 found->pub.signal = res->pub.signal; 529 found->pub.capability = res->pub.capability; 530 found->ts = res->ts; 531 532 /* Update IEs */ 533 if (res->pub.proberesp_ies) { 534 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 535 size_t ielen = res->pub.len_proberesp_ies; 536 537 if (found->pub.proberesp_ies && 538 !found->proberesp_ies_allocated && 539 ksize(found) >= used + ielen) { 540 memcpy(found->pub.proberesp_ies, 541 res->pub.proberesp_ies, ielen); 542 found->pub.len_proberesp_ies = ielen; 543 } else { 544 u8 *ies = found->pub.proberesp_ies; 545 546 if (found->proberesp_ies_allocated) 547 ies = krealloc(ies, ielen, GFP_ATOMIC); 548 else 549 ies = kmalloc(ielen, GFP_ATOMIC); 550 551 if (ies) { 552 memcpy(ies, res->pub.proberesp_ies, 553 ielen); 554 found->proberesp_ies_allocated = true; 555 found->pub.proberesp_ies = ies; 556 found->pub.len_proberesp_ies = ielen; 557 } 558 } 559 560 /* Override possible earlier Beacon frame IEs */ 561 found->pub.information_elements = 562 found->pub.proberesp_ies; 563 found->pub.len_information_elements = 564 found->pub.len_proberesp_ies; 565 } 566 if (res->pub.beacon_ies) { 567 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 568 size_t ielen = res->pub.len_beacon_ies; 569 bool information_elements_is_beacon_ies = 570 (found->pub.information_elements == 571 found->pub.beacon_ies); 572 573 if (found->pub.beacon_ies && 574 !found->beacon_ies_allocated && 575 ksize(found) >= used + ielen) { 576 memcpy(found->pub.beacon_ies, 577 res->pub.beacon_ies, ielen); 578 found->pub.len_beacon_ies = ielen; 579 } else { 580 u8 *ies = found->pub.beacon_ies; 581 582 if (found->beacon_ies_allocated) 583 ies = krealloc(ies, ielen, GFP_ATOMIC); 584 else 585 ies = kmalloc(ielen, GFP_ATOMIC); 586 587 if (ies) { 588 memcpy(ies, res->pub.beacon_ies, 589 ielen); 590 found->beacon_ies_allocated = true; 591 found->pub.beacon_ies = ies; 592 found->pub.len_beacon_ies = ielen; 593 } 594 } 595 596 /* Override IEs if they were from a beacon before */ 597 if (information_elements_is_beacon_ies) { 598 found->pub.information_elements = 599 found->pub.beacon_ies; 600 found->pub.len_information_elements = 601 found->pub.len_beacon_ies; 602 } 603 } 604 605 kref_put(&res->ref, bss_release); 606 } else { 607 /* this "consumes" the reference */ 608 list_add_tail(&res->list, &dev->bss_list); 609 rb_insert_bss(dev, res); 610 found = res; 611 } 612 613 dev->bss_generation++; 614 spin_unlock_bh(&dev->bss_lock); 615 616 kref_get(&found->ref); 617 return found; 618 } 619 620 struct cfg80211_bss* 621 cfg80211_inform_bss(struct wiphy *wiphy, 622 struct ieee80211_channel *channel, 623 const u8 *bssid, 624 u64 timestamp, u16 capability, u16 beacon_interval, 625 const u8 *ie, size_t ielen, 626 s32 signal, gfp_t gfp) 627 { 628 struct cfg80211_internal_bss *res; 629 size_t privsz; 630 631 if (WARN_ON(!wiphy)) 632 return NULL; 633 634 privsz = wiphy->bss_priv_size; 635 636 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 637 (signal < 0 || signal > 100))) 638 return NULL; 639 640 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 641 if (!res) 642 return NULL; 643 644 memcpy(res->pub.bssid, bssid, ETH_ALEN); 645 res->pub.channel = channel; 646 res->pub.signal = signal; 647 res->pub.tsf = timestamp; 648 res->pub.beacon_interval = beacon_interval; 649 res->pub.capability = capability; 650 /* 651 * Since we do not know here whether the IEs are from a Beacon or Probe 652 * Response frame, we need to pick one of the options and only use it 653 * with the driver that does not provide the full Beacon/Probe Response 654 * frame. Use Beacon frame pointer to avoid indicating that this should 655 * override the information_elements pointer should we have received an 656 * earlier indication of Probe Response data. 657 * 658 * The initial buffer for the IEs is allocated with the BSS entry and 659 * is located after the private area. 660 */ 661 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 662 memcpy(res->pub.beacon_ies, ie, ielen); 663 res->pub.len_beacon_ies = ielen; 664 res->pub.information_elements = res->pub.beacon_ies; 665 res->pub.len_information_elements = res->pub.len_beacon_ies; 666 667 kref_init(&res->ref); 668 669 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 670 if (!res) 671 return NULL; 672 673 if (res->pub.capability & WLAN_CAPABILITY_ESS) 674 regulatory_hint_found_beacon(wiphy, channel, gfp); 675 676 /* cfg80211_bss_update gives us a referenced result */ 677 return &res->pub; 678 } 679 EXPORT_SYMBOL(cfg80211_inform_bss); 680 681 struct cfg80211_bss * 682 cfg80211_inform_bss_frame(struct wiphy *wiphy, 683 struct ieee80211_channel *channel, 684 struct ieee80211_mgmt *mgmt, size_t len, 685 s32 signal, gfp_t gfp) 686 { 687 struct cfg80211_internal_bss *res; 688 size_t ielen = len - offsetof(struct ieee80211_mgmt, 689 u.probe_resp.variable); 690 size_t privsz; 691 692 if (WARN_ON(!mgmt)) 693 return NULL; 694 695 if (WARN_ON(!wiphy)) 696 return NULL; 697 698 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 699 (signal < 0 || signal > 100))) 700 return NULL; 701 702 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 703 return NULL; 704 705 privsz = wiphy->bss_priv_size; 706 707 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 708 if (!res) 709 return NULL; 710 711 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 712 res->pub.channel = channel; 713 res->pub.signal = signal; 714 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 715 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 716 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 717 /* 718 * The initial buffer for the IEs is allocated with the BSS entry and 719 * is located after the private area. 720 */ 721 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 722 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 723 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 724 ielen); 725 res->pub.len_proberesp_ies = ielen; 726 res->pub.information_elements = res->pub.proberesp_ies; 727 res->pub.len_information_elements = res->pub.len_proberesp_ies; 728 } else { 729 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 730 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 731 res->pub.len_beacon_ies = ielen; 732 res->pub.information_elements = res->pub.beacon_ies; 733 res->pub.len_information_elements = res->pub.len_beacon_ies; 734 } 735 736 kref_init(&res->ref); 737 738 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 739 if (!res) 740 return NULL; 741 742 if (res->pub.capability & WLAN_CAPABILITY_ESS) 743 regulatory_hint_found_beacon(wiphy, channel, gfp); 744 745 /* cfg80211_bss_update gives us a referenced result */ 746 return &res->pub; 747 } 748 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 749 750 void cfg80211_put_bss(struct cfg80211_bss *pub) 751 { 752 struct cfg80211_internal_bss *bss; 753 754 if (!pub) 755 return; 756 757 bss = container_of(pub, struct cfg80211_internal_bss, pub); 758 kref_put(&bss->ref, bss_release); 759 } 760 EXPORT_SYMBOL(cfg80211_put_bss); 761 762 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 763 { 764 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 765 struct cfg80211_internal_bss *bss; 766 767 if (WARN_ON(!pub)) 768 return; 769 770 bss = container_of(pub, struct cfg80211_internal_bss, pub); 771 772 spin_lock_bh(&dev->bss_lock); 773 if (!list_empty(&bss->list)) { 774 __cfg80211_unlink_bss(dev, bss); 775 dev->bss_generation++; 776 } 777 spin_unlock_bh(&dev->bss_lock); 778 } 779 EXPORT_SYMBOL(cfg80211_unlink_bss); 780 781 #ifdef CONFIG_CFG80211_WEXT 782 int cfg80211_wext_siwscan(struct net_device *dev, 783 struct iw_request_info *info, 784 union iwreq_data *wrqu, char *extra) 785 { 786 struct cfg80211_registered_device *rdev; 787 struct wiphy *wiphy; 788 struct iw_scan_req *wreq = NULL; 789 struct cfg80211_scan_request *creq = NULL; 790 int i, err, n_channels = 0; 791 enum ieee80211_band band; 792 793 if (!netif_running(dev)) 794 return -ENETDOWN; 795 796 if (wrqu->data.length == sizeof(struct iw_scan_req)) 797 wreq = (struct iw_scan_req *)extra; 798 799 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 800 801 if (IS_ERR(rdev)) 802 return PTR_ERR(rdev); 803 804 if (rdev->scan_req) { 805 err = -EBUSY; 806 goto out; 807 } 808 809 wiphy = &rdev->wiphy; 810 811 /* Determine number of channels, needed to allocate creq */ 812 if (wreq && wreq->num_channels) 813 n_channels = wreq->num_channels; 814 else { 815 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 816 if (wiphy->bands[band]) 817 n_channels += wiphy->bands[band]->n_channels; 818 } 819 820 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 821 n_channels * sizeof(void *), 822 GFP_ATOMIC); 823 if (!creq) { 824 err = -ENOMEM; 825 goto out; 826 } 827 828 creq->wiphy = wiphy; 829 creq->dev = dev; 830 /* SSIDs come after channels */ 831 creq->ssids = (void *)&creq->channels[n_channels]; 832 creq->n_channels = n_channels; 833 creq->n_ssids = 1; 834 835 /* translate "Scan on frequencies" request */ 836 i = 0; 837 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 838 int j; 839 840 if (!wiphy->bands[band]) 841 continue; 842 843 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 844 /* ignore disabled channels */ 845 if (wiphy->bands[band]->channels[j].flags & 846 IEEE80211_CHAN_DISABLED) 847 continue; 848 849 /* If we have a wireless request structure and the 850 * wireless request specifies frequencies, then search 851 * for the matching hardware channel. 852 */ 853 if (wreq && wreq->num_channels) { 854 int k; 855 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 856 for (k = 0; k < wreq->num_channels; k++) { 857 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 858 if (wext_freq == wiphy_freq) 859 goto wext_freq_found; 860 } 861 goto wext_freq_not_found; 862 } 863 864 wext_freq_found: 865 creq->channels[i] = &wiphy->bands[band]->channels[j]; 866 i++; 867 wext_freq_not_found: ; 868 } 869 } 870 /* No channels found? */ 871 if (!i) { 872 err = -EINVAL; 873 goto out; 874 } 875 876 /* Set real number of channels specified in creq->channels[] */ 877 creq->n_channels = i; 878 879 /* translate "Scan for SSID" request */ 880 if (wreq) { 881 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 882 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 883 err = -EINVAL; 884 goto out; 885 } 886 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 887 creq->ssids[0].ssid_len = wreq->essid_len; 888 } 889 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 890 creq->n_ssids = 0; 891 } 892 893 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 894 if (wiphy->bands[i]) 895 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 896 897 rdev->scan_req = creq; 898 err = rdev->ops->scan(wiphy, dev, creq); 899 if (err) { 900 rdev->scan_req = NULL; 901 /* creq will be freed below */ 902 } else { 903 nl80211_send_scan_start(rdev, dev); 904 /* creq now owned by driver */ 905 creq = NULL; 906 dev_hold(dev); 907 } 908 out: 909 kfree(creq); 910 cfg80211_unlock_rdev(rdev); 911 return err; 912 } 913 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 914 915 static void ieee80211_scan_add_ies(struct iw_request_info *info, 916 struct cfg80211_bss *bss, 917 char **current_ev, char *end_buf) 918 { 919 u8 *pos, *end, *next; 920 struct iw_event iwe; 921 922 if (!bss->information_elements || 923 !bss->len_information_elements) 924 return; 925 926 /* 927 * If needed, fragment the IEs buffer (at IE boundaries) into short 928 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 929 */ 930 pos = bss->information_elements; 931 end = pos + bss->len_information_elements; 932 933 while (end - pos > IW_GENERIC_IE_MAX) { 934 next = pos + 2 + pos[1]; 935 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 936 next = next + 2 + next[1]; 937 938 memset(&iwe, 0, sizeof(iwe)); 939 iwe.cmd = IWEVGENIE; 940 iwe.u.data.length = next - pos; 941 *current_ev = iwe_stream_add_point(info, *current_ev, 942 end_buf, &iwe, pos); 943 944 pos = next; 945 } 946 947 if (end > pos) { 948 memset(&iwe, 0, sizeof(iwe)); 949 iwe.cmd = IWEVGENIE; 950 iwe.u.data.length = end - pos; 951 *current_ev = iwe_stream_add_point(info, *current_ev, 952 end_buf, &iwe, pos); 953 } 954 } 955 956 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 957 { 958 unsigned long end = jiffies; 959 960 if (end >= start) 961 return jiffies_to_msecs(end - start); 962 963 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 964 } 965 966 static char * 967 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 968 struct cfg80211_internal_bss *bss, char *current_ev, 969 char *end_buf) 970 { 971 struct iw_event iwe; 972 u8 *buf, *cfg, *p; 973 u8 *ie = bss->pub.information_elements; 974 int rem = bss->pub.len_information_elements, i, sig; 975 bool ismesh = false; 976 977 memset(&iwe, 0, sizeof(iwe)); 978 iwe.cmd = SIOCGIWAP; 979 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 980 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 981 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 982 IW_EV_ADDR_LEN); 983 984 memset(&iwe, 0, sizeof(iwe)); 985 iwe.cmd = SIOCGIWFREQ; 986 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 987 iwe.u.freq.e = 0; 988 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 989 IW_EV_FREQ_LEN); 990 991 memset(&iwe, 0, sizeof(iwe)); 992 iwe.cmd = SIOCGIWFREQ; 993 iwe.u.freq.m = bss->pub.channel->center_freq; 994 iwe.u.freq.e = 6; 995 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 996 IW_EV_FREQ_LEN); 997 998 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 999 memset(&iwe, 0, sizeof(iwe)); 1000 iwe.cmd = IWEVQUAL; 1001 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1002 IW_QUAL_NOISE_INVALID | 1003 IW_QUAL_QUAL_UPDATED; 1004 switch (wiphy->signal_type) { 1005 case CFG80211_SIGNAL_TYPE_MBM: 1006 sig = bss->pub.signal / 100; 1007 iwe.u.qual.level = sig; 1008 iwe.u.qual.updated |= IW_QUAL_DBM; 1009 if (sig < -110) /* rather bad */ 1010 sig = -110; 1011 else if (sig > -40) /* perfect */ 1012 sig = -40; 1013 /* will give a range of 0 .. 70 */ 1014 iwe.u.qual.qual = sig + 110; 1015 break; 1016 case CFG80211_SIGNAL_TYPE_UNSPEC: 1017 iwe.u.qual.level = bss->pub.signal; 1018 /* will give range 0 .. 100 */ 1019 iwe.u.qual.qual = bss->pub.signal; 1020 break; 1021 default: 1022 /* not reached */ 1023 break; 1024 } 1025 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1026 &iwe, IW_EV_QUAL_LEN); 1027 } 1028 1029 memset(&iwe, 0, sizeof(iwe)); 1030 iwe.cmd = SIOCGIWENCODE; 1031 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1032 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1033 else 1034 iwe.u.data.flags = IW_ENCODE_DISABLED; 1035 iwe.u.data.length = 0; 1036 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1037 &iwe, ""); 1038 1039 while (rem >= 2) { 1040 /* invalid data */ 1041 if (ie[1] > rem - 2) 1042 break; 1043 1044 switch (ie[0]) { 1045 case WLAN_EID_SSID: 1046 memset(&iwe, 0, sizeof(iwe)); 1047 iwe.cmd = SIOCGIWESSID; 1048 iwe.u.data.length = ie[1]; 1049 iwe.u.data.flags = 1; 1050 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1051 &iwe, ie + 2); 1052 break; 1053 case WLAN_EID_MESH_ID: 1054 memset(&iwe, 0, sizeof(iwe)); 1055 iwe.cmd = SIOCGIWESSID; 1056 iwe.u.data.length = ie[1]; 1057 iwe.u.data.flags = 1; 1058 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1059 &iwe, ie + 2); 1060 break; 1061 case WLAN_EID_MESH_CONFIG: 1062 ismesh = true; 1063 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1064 break; 1065 buf = kmalloc(50, GFP_ATOMIC); 1066 if (!buf) 1067 break; 1068 cfg = ie + 2; 1069 memset(&iwe, 0, sizeof(iwe)); 1070 iwe.cmd = IWEVCUSTOM; 1071 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1072 "0x%02X", cfg[0]); 1073 iwe.u.data.length = strlen(buf); 1074 current_ev = iwe_stream_add_point(info, current_ev, 1075 end_buf, 1076 &iwe, buf); 1077 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1078 cfg[1]); 1079 iwe.u.data.length = strlen(buf); 1080 current_ev = iwe_stream_add_point(info, current_ev, 1081 end_buf, 1082 &iwe, buf); 1083 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1084 cfg[2]); 1085 iwe.u.data.length = strlen(buf); 1086 current_ev = iwe_stream_add_point(info, current_ev, 1087 end_buf, 1088 &iwe, buf); 1089 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1090 iwe.u.data.length = strlen(buf); 1091 current_ev = iwe_stream_add_point(info, current_ev, 1092 end_buf, 1093 &iwe, buf); 1094 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1095 iwe.u.data.length = strlen(buf); 1096 current_ev = iwe_stream_add_point(info, current_ev, 1097 end_buf, 1098 &iwe, buf); 1099 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1100 iwe.u.data.length = strlen(buf); 1101 current_ev = iwe_stream_add_point(info, current_ev, 1102 end_buf, 1103 &iwe, buf); 1104 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1105 iwe.u.data.length = strlen(buf); 1106 current_ev = iwe_stream_add_point(info, current_ev, 1107 end_buf, 1108 &iwe, buf); 1109 kfree(buf); 1110 break; 1111 case WLAN_EID_SUPP_RATES: 1112 case WLAN_EID_EXT_SUPP_RATES: 1113 /* display all supported rates in readable format */ 1114 p = current_ev + iwe_stream_lcp_len(info); 1115 1116 memset(&iwe, 0, sizeof(iwe)); 1117 iwe.cmd = SIOCGIWRATE; 1118 /* Those two flags are ignored... */ 1119 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1120 1121 for (i = 0; i < ie[1]; i++) { 1122 iwe.u.bitrate.value = 1123 ((ie[i + 2] & 0x7f) * 500000); 1124 p = iwe_stream_add_value(info, current_ev, p, 1125 end_buf, &iwe, IW_EV_PARAM_LEN); 1126 } 1127 current_ev = p; 1128 break; 1129 } 1130 rem -= ie[1] + 2; 1131 ie += ie[1] + 2; 1132 } 1133 1134 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1135 ismesh) { 1136 memset(&iwe, 0, sizeof(iwe)); 1137 iwe.cmd = SIOCGIWMODE; 1138 if (ismesh) 1139 iwe.u.mode = IW_MODE_MESH; 1140 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1141 iwe.u.mode = IW_MODE_MASTER; 1142 else 1143 iwe.u.mode = IW_MODE_ADHOC; 1144 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1145 &iwe, IW_EV_UINT_LEN); 1146 } 1147 1148 buf = kmalloc(30, GFP_ATOMIC); 1149 if (buf) { 1150 memset(&iwe, 0, sizeof(iwe)); 1151 iwe.cmd = IWEVCUSTOM; 1152 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1153 iwe.u.data.length = strlen(buf); 1154 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1155 &iwe, buf); 1156 memset(&iwe, 0, sizeof(iwe)); 1157 iwe.cmd = IWEVCUSTOM; 1158 sprintf(buf, " Last beacon: %ums ago", 1159 elapsed_jiffies_msecs(bss->ts)); 1160 iwe.u.data.length = strlen(buf); 1161 current_ev = iwe_stream_add_point(info, current_ev, 1162 end_buf, &iwe, buf); 1163 kfree(buf); 1164 } 1165 1166 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1167 1168 return current_ev; 1169 } 1170 1171 1172 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1173 struct iw_request_info *info, 1174 char *buf, size_t len) 1175 { 1176 char *current_ev = buf; 1177 char *end_buf = buf + len; 1178 struct cfg80211_internal_bss *bss; 1179 1180 spin_lock_bh(&dev->bss_lock); 1181 cfg80211_bss_expire(dev); 1182 1183 list_for_each_entry(bss, &dev->bss_list, list) { 1184 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1185 spin_unlock_bh(&dev->bss_lock); 1186 return -E2BIG; 1187 } 1188 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1189 current_ev, end_buf); 1190 } 1191 spin_unlock_bh(&dev->bss_lock); 1192 return current_ev - buf; 1193 } 1194 1195 1196 int cfg80211_wext_giwscan(struct net_device *dev, 1197 struct iw_request_info *info, 1198 struct iw_point *data, char *extra) 1199 { 1200 struct cfg80211_registered_device *rdev; 1201 int res; 1202 1203 if (!netif_running(dev)) 1204 return -ENETDOWN; 1205 1206 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1207 1208 if (IS_ERR(rdev)) 1209 return PTR_ERR(rdev); 1210 1211 if (rdev->scan_req) { 1212 res = -EAGAIN; 1213 goto out; 1214 } 1215 1216 res = ieee80211_scan_results(rdev, info, extra, data->length); 1217 data->length = 0; 1218 if (res >= 0) { 1219 data->length = res; 1220 res = 0; 1221 } 1222 1223 out: 1224 cfg80211_unlock_rdev(rdev); 1225 return res; 1226 } 1227 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1228 #endif 1229