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_core(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 return memcmp(a->bssid, b->bssid, ETH_ALEN); 382 } 383 384 static int cmp_bss(struct cfg80211_bss *a, 385 struct cfg80211_bss *b) 386 { 387 int r; 388 389 r = cmp_bss_core(a, b); 390 if (r) 391 return r; 392 393 return cmp_ies(WLAN_EID_SSID, 394 a->information_elements, 395 a->len_information_elements, 396 b->information_elements, 397 b->len_information_elements); 398 } 399 400 static int cmp_hidden_bss(struct cfg80211_bss *a, 401 struct cfg80211_bss *b) 402 { 403 const u8 *ie1; 404 const u8 *ie2; 405 int i; 406 int r; 407 408 r = cmp_bss_core(a, b); 409 if (r) 410 return r; 411 412 ie1 = cfg80211_find_ie(WLAN_EID_SSID, 413 a->information_elements, 414 a->len_information_elements); 415 ie2 = cfg80211_find_ie(WLAN_EID_SSID, 416 b->information_elements, 417 b->len_information_elements); 418 419 /* Key comparator must use same algorithm in any rb-tree 420 * search function (order is important), otherwise ordering 421 * of items in the tree is broken and search gives incorrect 422 * results. This code uses same order as cmp_ies() does. */ 423 424 /* sort missing IE before (left of) present IE */ 425 if (!ie1) 426 return -1; 427 if (!ie2) 428 return 1; 429 430 /* zero-size SSID is used as an indication of the hidden bss */ 431 if (!ie2[1]) 432 return 0; 433 434 /* sort by length first, then by contents */ 435 if (ie1[1] != ie2[1]) 436 return ie2[1] - ie1[1]; 437 438 /* zeroed SSID ie is another indication of a hidden bss */ 439 for (i = 0; i < ie2[1]; i++) 440 if (ie2[i + 2]) 441 return -1; 442 443 return 0; 444 } 445 446 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 447 struct ieee80211_channel *channel, 448 const u8 *bssid, 449 const u8 *ssid, size_t ssid_len, 450 u16 capa_mask, u16 capa_val) 451 { 452 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 453 struct cfg80211_internal_bss *bss, *res = NULL; 454 unsigned long now = jiffies; 455 456 spin_lock_bh(&dev->bss_lock); 457 458 list_for_each_entry(bss, &dev->bss_list, list) { 459 if ((bss->pub.capability & capa_mask) != capa_val) 460 continue; 461 if (channel && bss->pub.channel != channel) 462 continue; 463 /* Don't get expired BSS structs */ 464 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 465 !atomic_read(&bss->hold)) 466 continue; 467 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 468 res = bss; 469 kref_get(&res->ref); 470 break; 471 } 472 } 473 474 spin_unlock_bh(&dev->bss_lock); 475 if (!res) 476 return NULL; 477 return &res->pub; 478 } 479 EXPORT_SYMBOL(cfg80211_get_bss); 480 481 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 482 struct ieee80211_channel *channel, 483 const u8 *meshid, size_t meshidlen, 484 const u8 *meshcfg) 485 { 486 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 487 struct cfg80211_internal_bss *bss, *res = NULL; 488 489 spin_lock_bh(&dev->bss_lock); 490 491 list_for_each_entry(bss, &dev->bss_list, list) { 492 if (channel && bss->pub.channel != channel) 493 continue; 494 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 495 res = bss; 496 kref_get(&res->ref); 497 break; 498 } 499 } 500 501 spin_unlock_bh(&dev->bss_lock); 502 if (!res) 503 return NULL; 504 return &res->pub; 505 } 506 EXPORT_SYMBOL(cfg80211_get_mesh); 507 508 509 static void rb_insert_bss(struct cfg80211_registered_device *dev, 510 struct cfg80211_internal_bss *bss) 511 { 512 struct rb_node **p = &dev->bss_tree.rb_node; 513 struct rb_node *parent = NULL; 514 struct cfg80211_internal_bss *tbss; 515 int cmp; 516 517 while (*p) { 518 parent = *p; 519 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 520 521 cmp = cmp_bss(&bss->pub, &tbss->pub); 522 523 if (WARN_ON(!cmp)) { 524 /* will sort of leak this BSS */ 525 return; 526 } 527 528 if (cmp < 0) 529 p = &(*p)->rb_left; 530 else 531 p = &(*p)->rb_right; 532 } 533 534 rb_link_node(&bss->rbn, parent, p); 535 rb_insert_color(&bss->rbn, &dev->bss_tree); 536 } 537 538 static struct cfg80211_internal_bss * 539 rb_find_bss(struct cfg80211_registered_device *dev, 540 struct cfg80211_internal_bss *res) 541 { 542 struct rb_node *n = dev->bss_tree.rb_node; 543 struct cfg80211_internal_bss *bss; 544 int r; 545 546 while (n) { 547 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 548 r = cmp_bss(&res->pub, &bss->pub); 549 550 if (r == 0) 551 return bss; 552 else if (r < 0) 553 n = n->rb_left; 554 else 555 n = n->rb_right; 556 } 557 558 return NULL; 559 } 560 561 static struct cfg80211_internal_bss * 562 rb_find_hidden_bss(struct cfg80211_registered_device *dev, 563 struct cfg80211_internal_bss *res) 564 { 565 struct rb_node *n = dev->bss_tree.rb_node; 566 struct cfg80211_internal_bss *bss; 567 int r; 568 569 while (n) { 570 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 571 r = cmp_hidden_bss(&res->pub, &bss->pub); 572 573 if (r == 0) 574 return bss; 575 else if (r < 0) 576 n = n->rb_left; 577 else 578 n = n->rb_right; 579 } 580 581 return NULL; 582 } 583 584 static void 585 copy_hidden_ies(struct cfg80211_internal_bss *res, 586 struct cfg80211_internal_bss *hidden) 587 { 588 if (unlikely(res->pub.beacon_ies)) 589 return; 590 if (WARN_ON(!hidden->pub.beacon_ies)) 591 return; 592 593 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC); 594 if (unlikely(!res->pub.beacon_ies)) 595 return; 596 597 res->beacon_ies_allocated = true; 598 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies; 599 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies, 600 res->pub.len_beacon_ies); 601 } 602 603 static struct cfg80211_internal_bss * 604 cfg80211_bss_update(struct cfg80211_registered_device *dev, 605 struct cfg80211_internal_bss *res) 606 { 607 struct cfg80211_internal_bss *found = NULL; 608 609 /* 610 * The reference to "res" is donated to this function. 611 */ 612 613 if (WARN_ON(!res->pub.channel)) { 614 kref_put(&res->ref, bss_release); 615 return NULL; 616 } 617 618 res->ts = jiffies; 619 620 spin_lock_bh(&dev->bss_lock); 621 622 found = rb_find_bss(dev, res); 623 624 if (found) { 625 found->pub.beacon_interval = res->pub.beacon_interval; 626 found->pub.tsf = res->pub.tsf; 627 found->pub.signal = res->pub.signal; 628 found->pub.capability = res->pub.capability; 629 found->ts = res->ts; 630 631 /* Update IEs */ 632 if (res->pub.proberesp_ies) { 633 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 634 size_t ielen = res->pub.len_proberesp_ies; 635 636 if (found->pub.proberesp_ies && 637 !found->proberesp_ies_allocated && 638 ksize(found) >= used + ielen) { 639 memcpy(found->pub.proberesp_ies, 640 res->pub.proberesp_ies, ielen); 641 found->pub.len_proberesp_ies = ielen; 642 } else { 643 u8 *ies = found->pub.proberesp_ies; 644 645 if (found->proberesp_ies_allocated) 646 ies = krealloc(ies, ielen, GFP_ATOMIC); 647 else 648 ies = kmalloc(ielen, GFP_ATOMIC); 649 650 if (ies) { 651 memcpy(ies, res->pub.proberesp_ies, 652 ielen); 653 found->proberesp_ies_allocated = true; 654 found->pub.proberesp_ies = ies; 655 found->pub.len_proberesp_ies = ielen; 656 } 657 } 658 659 /* Override possible earlier Beacon frame IEs */ 660 found->pub.information_elements = 661 found->pub.proberesp_ies; 662 found->pub.len_information_elements = 663 found->pub.len_proberesp_ies; 664 } 665 if (res->pub.beacon_ies) { 666 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 667 size_t ielen = res->pub.len_beacon_ies; 668 bool information_elements_is_beacon_ies = 669 (found->pub.information_elements == 670 found->pub.beacon_ies); 671 672 if (found->pub.beacon_ies && 673 !found->beacon_ies_allocated && 674 ksize(found) >= used + ielen) { 675 memcpy(found->pub.beacon_ies, 676 res->pub.beacon_ies, ielen); 677 found->pub.len_beacon_ies = ielen; 678 } else { 679 u8 *ies = found->pub.beacon_ies; 680 681 if (found->beacon_ies_allocated) 682 ies = krealloc(ies, ielen, GFP_ATOMIC); 683 else 684 ies = kmalloc(ielen, GFP_ATOMIC); 685 686 if (ies) { 687 memcpy(ies, res->pub.beacon_ies, 688 ielen); 689 found->beacon_ies_allocated = true; 690 found->pub.beacon_ies = ies; 691 found->pub.len_beacon_ies = ielen; 692 } 693 } 694 695 /* Override IEs if they were from a beacon before */ 696 if (information_elements_is_beacon_ies) { 697 found->pub.information_elements = 698 found->pub.beacon_ies; 699 found->pub.len_information_elements = 700 found->pub.len_beacon_ies; 701 } 702 } 703 704 kref_put(&res->ref, bss_release); 705 } else { 706 struct cfg80211_internal_bss *hidden; 707 708 /* First check if the beacon is a probe response from 709 * a hidden bss. If so, copy beacon ies (with nullified 710 * ssid) into the probe response bss entry (with real ssid). 711 * It is required basically for PSM implementation 712 * (probe responses do not contain tim ie) */ 713 714 /* TODO: The code is not trying to update existing probe 715 * response bss entries when beacon ies are 716 * getting changed. */ 717 hidden = rb_find_hidden_bss(dev, res); 718 if (hidden) 719 copy_hidden_ies(res, hidden); 720 721 /* this "consumes" the reference */ 722 list_add_tail(&res->list, &dev->bss_list); 723 rb_insert_bss(dev, res); 724 found = res; 725 } 726 727 dev->bss_generation++; 728 spin_unlock_bh(&dev->bss_lock); 729 730 kref_get(&found->ref); 731 return found; 732 } 733 734 struct cfg80211_bss* 735 cfg80211_inform_bss(struct wiphy *wiphy, 736 struct ieee80211_channel *channel, 737 const u8 *bssid, 738 u64 timestamp, u16 capability, u16 beacon_interval, 739 const u8 *ie, size_t ielen, 740 s32 signal, gfp_t gfp) 741 { 742 struct cfg80211_internal_bss *res; 743 size_t privsz; 744 745 if (WARN_ON(!wiphy)) 746 return NULL; 747 748 privsz = wiphy->bss_priv_size; 749 750 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 751 (signal < 0 || signal > 100))) 752 return NULL; 753 754 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 755 if (!res) 756 return NULL; 757 758 memcpy(res->pub.bssid, bssid, ETH_ALEN); 759 res->pub.channel = channel; 760 res->pub.signal = signal; 761 res->pub.tsf = timestamp; 762 res->pub.beacon_interval = beacon_interval; 763 res->pub.capability = capability; 764 /* 765 * Since we do not know here whether the IEs are from a Beacon or Probe 766 * Response frame, we need to pick one of the options and only use it 767 * with the driver that does not provide the full Beacon/Probe Response 768 * frame. Use Beacon frame pointer to avoid indicating that this should 769 * override the information_elements pointer should we have received an 770 * earlier indication of Probe Response data. 771 * 772 * The initial buffer for the IEs is allocated with the BSS entry and 773 * is located after the private area. 774 */ 775 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 776 memcpy(res->pub.beacon_ies, ie, ielen); 777 res->pub.len_beacon_ies = ielen; 778 res->pub.information_elements = res->pub.beacon_ies; 779 res->pub.len_information_elements = res->pub.len_beacon_ies; 780 781 kref_init(&res->ref); 782 783 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 784 if (!res) 785 return NULL; 786 787 if (res->pub.capability & WLAN_CAPABILITY_ESS) 788 regulatory_hint_found_beacon(wiphy, channel, gfp); 789 790 /* cfg80211_bss_update gives us a referenced result */ 791 return &res->pub; 792 } 793 EXPORT_SYMBOL(cfg80211_inform_bss); 794 795 struct cfg80211_bss * 796 cfg80211_inform_bss_frame(struct wiphy *wiphy, 797 struct ieee80211_channel *channel, 798 struct ieee80211_mgmt *mgmt, size_t len, 799 s32 signal, gfp_t gfp) 800 { 801 struct cfg80211_internal_bss *res; 802 size_t ielen = len - offsetof(struct ieee80211_mgmt, 803 u.probe_resp.variable); 804 size_t privsz; 805 806 if (WARN_ON(!mgmt)) 807 return NULL; 808 809 if (WARN_ON(!wiphy)) 810 return NULL; 811 812 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 813 (signal < 0 || signal > 100))) 814 return NULL; 815 816 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 817 return NULL; 818 819 privsz = wiphy->bss_priv_size; 820 821 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 822 if (!res) 823 return NULL; 824 825 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 826 res->pub.channel = channel; 827 res->pub.signal = signal; 828 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 829 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 830 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 831 /* 832 * The initial buffer for the IEs is allocated with the BSS entry and 833 * is located after the private area. 834 */ 835 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 836 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 837 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 838 ielen); 839 res->pub.len_proberesp_ies = ielen; 840 res->pub.information_elements = res->pub.proberesp_ies; 841 res->pub.len_information_elements = res->pub.len_proberesp_ies; 842 } else { 843 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 844 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 845 res->pub.len_beacon_ies = ielen; 846 res->pub.information_elements = res->pub.beacon_ies; 847 res->pub.len_information_elements = res->pub.len_beacon_ies; 848 } 849 850 kref_init(&res->ref); 851 852 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 853 if (!res) 854 return NULL; 855 856 if (res->pub.capability & WLAN_CAPABILITY_ESS) 857 regulatory_hint_found_beacon(wiphy, channel, gfp); 858 859 /* cfg80211_bss_update gives us a referenced result */ 860 return &res->pub; 861 } 862 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 863 864 void cfg80211_ref_bss(struct cfg80211_bss *pub) 865 { 866 struct cfg80211_internal_bss *bss; 867 868 if (!pub) 869 return; 870 871 bss = container_of(pub, struct cfg80211_internal_bss, pub); 872 kref_get(&bss->ref); 873 } 874 EXPORT_SYMBOL(cfg80211_ref_bss); 875 876 void cfg80211_put_bss(struct cfg80211_bss *pub) 877 { 878 struct cfg80211_internal_bss *bss; 879 880 if (!pub) 881 return; 882 883 bss = container_of(pub, struct cfg80211_internal_bss, pub); 884 kref_put(&bss->ref, bss_release); 885 } 886 EXPORT_SYMBOL(cfg80211_put_bss); 887 888 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 889 { 890 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 891 struct cfg80211_internal_bss *bss; 892 893 if (WARN_ON(!pub)) 894 return; 895 896 bss = container_of(pub, struct cfg80211_internal_bss, pub); 897 898 spin_lock_bh(&dev->bss_lock); 899 if (!list_empty(&bss->list)) { 900 __cfg80211_unlink_bss(dev, bss); 901 dev->bss_generation++; 902 } 903 spin_unlock_bh(&dev->bss_lock); 904 } 905 EXPORT_SYMBOL(cfg80211_unlink_bss); 906 907 #ifdef CONFIG_CFG80211_WEXT 908 int cfg80211_wext_siwscan(struct net_device *dev, 909 struct iw_request_info *info, 910 union iwreq_data *wrqu, char *extra) 911 { 912 struct cfg80211_registered_device *rdev; 913 struct wiphy *wiphy; 914 struct iw_scan_req *wreq = NULL; 915 struct cfg80211_scan_request *creq = NULL; 916 int i, err, n_channels = 0; 917 enum ieee80211_band band; 918 919 if (!netif_running(dev)) 920 return -ENETDOWN; 921 922 if (wrqu->data.length == sizeof(struct iw_scan_req)) 923 wreq = (struct iw_scan_req *)extra; 924 925 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 926 927 if (IS_ERR(rdev)) 928 return PTR_ERR(rdev); 929 930 if (rdev->scan_req) { 931 err = -EBUSY; 932 goto out; 933 } 934 935 wiphy = &rdev->wiphy; 936 937 /* Determine number of channels, needed to allocate creq */ 938 if (wreq && wreq->num_channels) 939 n_channels = wreq->num_channels; 940 else { 941 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 942 if (wiphy->bands[band]) 943 n_channels += wiphy->bands[band]->n_channels; 944 } 945 946 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 947 n_channels * sizeof(void *), 948 GFP_ATOMIC); 949 if (!creq) { 950 err = -ENOMEM; 951 goto out; 952 } 953 954 creq->wiphy = wiphy; 955 creq->dev = dev; 956 /* SSIDs come after channels */ 957 creq->ssids = (void *)&creq->channels[n_channels]; 958 creq->n_channels = n_channels; 959 creq->n_ssids = 1; 960 961 /* translate "Scan on frequencies" request */ 962 i = 0; 963 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 964 int j; 965 966 if (!wiphy->bands[band]) 967 continue; 968 969 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 970 /* ignore disabled channels */ 971 if (wiphy->bands[band]->channels[j].flags & 972 IEEE80211_CHAN_DISABLED) 973 continue; 974 975 /* If we have a wireless request structure and the 976 * wireless request specifies frequencies, then search 977 * for the matching hardware channel. 978 */ 979 if (wreq && wreq->num_channels) { 980 int k; 981 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 982 for (k = 0; k < wreq->num_channels; k++) { 983 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 984 if (wext_freq == wiphy_freq) 985 goto wext_freq_found; 986 } 987 goto wext_freq_not_found; 988 } 989 990 wext_freq_found: 991 creq->channels[i] = &wiphy->bands[band]->channels[j]; 992 i++; 993 wext_freq_not_found: ; 994 } 995 } 996 /* No channels found? */ 997 if (!i) { 998 err = -EINVAL; 999 goto out; 1000 } 1001 1002 /* Set real number of channels specified in creq->channels[] */ 1003 creq->n_channels = i; 1004 1005 /* translate "Scan for SSID" request */ 1006 if (wreq) { 1007 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1008 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1009 err = -EINVAL; 1010 goto out; 1011 } 1012 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1013 creq->ssids[0].ssid_len = wreq->essid_len; 1014 } 1015 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1016 creq->n_ssids = 0; 1017 } 1018 1019 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1020 if (wiphy->bands[i]) 1021 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1022 1023 rdev->scan_req = creq; 1024 err = rdev->ops->scan(wiphy, dev, creq); 1025 if (err) { 1026 rdev->scan_req = NULL; 1027 /* creq will be freed below */ 1028 } else { 1029 nl80211_send_scan_start(rdev, dev); 1030 /* creq now owned by driver */ 1031 creq = NULL; 1032 dev_hold(dev); 1033 } 1034 out: 1035 kfree(creq); 1036 cfg80211_unlock_rdev(rdev); 1037 return err; 1038 } 1039 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1040 1041 static void ieee80211_scan_add_ies(struct iw_request_info *info, 1042 struct cfg80211_bss *bss, 1043 char **current_ev, char *end_buf) 1044 { 1045 u8 *pos, *end, *next; 1046 struct iw_event iwe; 1047 1048 if (!bss->information_elements || 1049 !bss->len_information_elements) 1050 return; 1051 1052 /* 1053 * If needed, fragment the IEs buffer (at IE boundaries) into short 1054 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1055 */ 1056 pos = bss->information_elements; 1057 end = pos + bss->len_information_elements; 1058 1059 while (end - pos > IW_GENERIC_IE_MAX) { 1060 next = pos + 2 + pos[1]; 1061 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1062 next = next + 2 + next[1]; 1063 1064 memset(&iwe, 0, sizeof(iwe)); 1065 iwe.cmd = IWEVGENIE; 1066 iwe.u.data.length = next - pos; 1067 *current_ev = iwe_stream_add_point(info, *current_ev, 1068 end_buf, &iwe, pos); 1069 1070 pos = next; 1071 } 1072 1073 if (end > pos) { 1074 memset(&iwe, 0, sizeof(iwe)); 1075 iwe.cmd = IWEVGENIE; 1076 iwe.u.data.length = end - pos; 1077 *current_ev = iwe_stream_add_point(info, *current_ev, 1078 end_buf, &iwe, pos); 1079 } 1080 } 1081 1082 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 1083 { 1084 unsigned long end = jiffies; 1085 1086 if (end >= start) 1087 return jiffies_to_msecs(end - start); 1088 1089 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 1090 } 1091 1092 static char * 1093 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1094 struct cfg80211_internal_bss *bss, char *current_ev, 1095 char *end_buf) 1096 { 1097 struct iw_event iwe; 1098 u8 *buf, *cfg, *p; 1099 u8 *ie = bss->pub.information_elements; 1100 int rem = bss->pub.len_information_elements, i, sig; 1101 bool ismesh = false; 1102 1103 memset(&iwe, 0, sizeof(iwe)); 1104 iwe.cmd = SIOCGIWAP; 1105 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1106 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1107 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1108 IW_EV_ADDR_LEN); 1109 1110 memset(&iwe, 0, sizeof(iwe)); 1111 iwe.cmd = SIOCGIWFREQ; 1112 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1113 iwe.u.freq.e = 0; 1114 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1115 IW_EV_FREQ_LEN); 1116 1117 memset(&iwe, 0, sizeof(iwe)); 1118 iwe.cmd = SIOCGIWFREQ; 1119 iwe.u.freq.m = bss->pub.channel->center_freq; 1120 iwe.u.freq.e = 6; 1121 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1122 IW_EV_FREQ_LEN); 1123 1124 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1125 memset(&iwe, 0, sizeof(iwe)); 1126 iwe.cmd = IWEVQUAL; 1127 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1128 IW_QUAL_NOISE_INVALID | 1129 IW_QUAL_QUAL_UPDATED; 1130 switch (wiphy->signal_type) { 1131 case CFG80211_SIGNAL_TYPE_MBM: 1132 sig = bss->pub.signal / 100; 1133 iwe.u.qual.level = sig; 1134 iwe.u.qual.updated |= IW_QUAL_DBM; 1135 if (sig < -110) /* rather bad */ 1136 sig = -110; 1137 else if (sig > -40) /* perfect */ 1138 sig = -40; 1139 /* will give a range of 0 .. 70 */ 1140 iwe.u.qual.qual = sig + 110; 1141 break; 1142 case CFG80211_SIGNAL_TYPE_UNSPEC: 1143 iwe.u.qual.level = bss->pub.signal; 1144 /* will give range 0 .. 100 */ 1145 iwe.u.qual.qual = bss->pub.signal; 1146 break; 1147 default: 1148 /* not reached */ 1149 break; 1150 } 1151 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1152 &iwe, IW_EV_QUAL_LEN); 1153 } 1154 1155 memset(&iwe, 0, sizeof(iwe)); 1156 iwe.cmd = SIOCGIWENCODE; 1157 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1158 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1159 else 1160 iwe.u.data.flags = IW_ENCODE_DISABLED; 1161 iwe.u.data.length = 0; 1162 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1163 &iwe, ""); 1164 1165 while (rem >= 2) { 1166 /* invalid data */ 1167 if (ie[1] > rem - 2) 1168 break; 1169 1170 switch (ie[0]) { 1171 case WLAN_EID_SSID: 1172 memset(&iwe, 0, sizeof(iwe)); 1173 iwe.cmd = SIOCGIWESSID; 1174 iwe.u.data.length = ie[1]; 1175 iwe.u.data.flags = 1; 1176 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1177 &iwe, ie + 2); 1178 break; 1179 case WLAN_EID_MESH_ID: 1180 memset(&iwe, 0, sizeof(iwe)); 1181 iwe.cmd = SIOCGIWESSID; 1182 iwe.u.data.length = ie[1]; 1183 iwe.u.data.flags = 1; 1184 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1185 &iwe, ie + 2); 1186 break; 1187 case WLAN_EID_MESH_CONFIG: 1188 ismesh = true; 1189 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1190 break; 1191 buf = kmalloc(50, GFP_ATOMIC); 1192 if (!buf) 1193 break; 1194 cfg = ie + 2; 1195 memset(&iwe, 0, sizeof(iwe)); 1196 iwe.cmd = IWEVCUSTOM; 1197 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1198 "0x%02X", cfg[0]); 1199 iwe.u.data.length = strlen(buf); 1200 current_ev = iwe_stream_add_point(info, current_ev, 1201 end_buf, 1202 &iwe, buf); 1203 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1204 cfg[1]); 1205 iwe.u.data.length = strlen(buf); 1206 current_ev = iwe_stream_add_point(info, current_ev, 1207 end_buf, 1208 &iwe, buf); 1209 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1210 cfg[2]); 1211 iwe.u.data.length = strlen(buf); 1212 current_ev = iwe_stream_add_point(info, current_ev, 1213 end_buf, 1214 &iwe, buf); 1215 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1216 iwe.u.data.length = strlen(buf); 1217 current_ev = iwe_stream_add_point(info, current_ev, 1218 end_buf, 1219 &iwe, buf); 1220 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1221 iwe.u.data.length = strlen(buf); 1222 current_ev = iwe_stream_add_point(info, current_ev, 1223 end_buf, 1224 &iwe, buf); 1225 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1226 iwe.u.data.length = strlen(buf); 1227 current_ev = iwe_stream_add_point(info, current_ev, 1228 end_buf, 1229 &iwe, buf); 1230 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1231 iwe.u.data.length = strlen(buf); 1232 current_ev = iwe_stream_add_point(info, current_ev, 1233 end_buf, 1234 &iwe, buf); 1235 kfree(buf); 1236 break; 1237 case WLAN_EID_SUPP_RATES: 1238 case WLAN_EID_EXT_SUPP_RATES: 1239 /* display all supported rates in readable format */ 1240 p = current_ev + iwe_stream_lcp_len(info); 1241 1242 memset(&iwe, 0, sizeof(iwe)); 1243 iwe.cmd = SIOCGIWRATE; 1244 /* Those two flags are ignored... */ 1245 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1246 1247 for (i = 0; i < ie[1]; i++) { 1248 iwe.u.bitrate.value = 1249 ((ie[i + 2] & 0x7f) * 500000); 1250 p = iwe_stream_add_value(info, current_ev, p, 1251 end_buf, &iwe, IW_EV_PARAM_LEN); 1252 } 1253 current_ev = p; 1254 break; 1255 } 1256 rem -= ie[1] + 2; 1257 ie += ie[1] + 2; 1258 } 1259 1260 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1261 ismesh) { 1262 memset(&iwe, 0, sizeof(iwe)); 1263 iwe.cmd = SIOCGIWMODE; 1264 if (ismesh) 1265 iwe.u.mode = IW_MODE_MESH; 1266 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1267 iwe.u.mode = IW_MODE_MASTER; 1268 else 1269 iwe.u.mode = IW_MODE_ADHOC; 1270 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1271 &iwe, IW_EV_UINT_LEN); 1272 } 1273 1274 buf = kmalloc(30, GFP_ATOMIC); 1275 if (buf) { 1276 memset(&iwe, 0, sizeof(iwe)); 1277 iwe.cmd = IWEVCUSTOM; 1278 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1279 iwe.u.data.length = strlen(buf); 1280 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1281 &iwe, buf); 1282 memset(&iwe, 0, sizeof(iwe)); 1283 iwe.cmd = IWEVCUSTOM; 1284 sprintf(buf, " Last beacon: %ums ago", 1285 elapsed_jiffies_msecs(bss->ts)); 1286 iwe.u.data.length = strlen(buf); 1287 current_ev = iwe_stream_add_point(info, current_ev, 1288 end_buf, &iwe, buf); 1289 kfree(buf); 1290 } 1291 1292 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1293 1294 return current_ev; 1295 } 1296 1297 1298 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1299 struct iw_request_info *info, 1300 char *buf, size_t len) 1301 { 1302 char *current_ev = buf; 1303 char *end_buf = buf + len; 1304 struct cfg80211_internal_bss *bss; 1305 1306 spin_lock_bh(&dev->bss_lock); 1307 cfg80211_bss_expire(dev); 1308 1309 list_for_each_entry(bss, &dev->bss_list, list) { 1310 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1311 spin_unlock_bh(&dev->bss_lock); 1312 return -E2BIG; 1313 } 1314 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1315 current_ev, end_buf); 1316 } 1317 spin_unlock_bh(&dev->bss_lock); 1318 return current_ev - buf; 1319 } 1320 1321 1322 int cfg80211_wext_giwscan(struct net_device *dev, 1323 struct iw_request_info *info, 1324 struct iw_point *data, char *extra) 1325 { 1326 struct cfg80211_registered_device *rdev; 1327 int res; 1328 1329 if (!netif_running(dev)) 1330 return -ENETDOWN; 1331 1332 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1333 1334 if (IS_ERR(rdev)) 1335 return PTR_ERR(rdev); 1336 1337 if (rdev->scan_req) { 1338 res = -EAGAIN; 1339 goto out; 1340 } 1341 1342 res = ieee80211_scan_results(rdev, info, extra, data->length); 1343 data->length = 0; 1344 if (res >= 0) { 1345 data->length = res; 1346 res = 0; 1347 } 1348 1349 out: 1350 cfg80211_unlock_rdev(rdev); 1351 return res; 1352 } 1353 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1354 #endif 1355