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 (30 * 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 && !ether_addr_equal(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 /* 382 * we can't use compare_ether_addr here since we need a < > operator. 383 * The binary return value of compare_ether_addr isn't enough 384 */ 385 return memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 386 } 387 388 static int cmp_bss(struct cfg80211_bss *a, 389 struct cfg80211_bss *b) 390 { 391 int r; 392 393 r = cmp_bss_core(a, b); 394 if (r) 395 return r; 396 397 return cmp_ies(WLAN_EID_SSID, 398 a->information_elements, 399 a->len_information_elements, 400 b->information_elements, 401 b->len_information_elements); 402 } 403 404 static int cmp_hidden_bss(struct cfg80211_bss *a, 405 struct cfg80211_bss *b) 406 { 407 const u8 *ie1; 408 const u8 *ie2; 409 int i; 410 int r; 411 412 r = cmp_bss_core(a, b); 413 if (r) 414 return r; 415 416 ie1 = cfg80211_find_ie(WLAN_EID_SSID, 417 a->information_elements, 418 a->len_information_elements); 419 ie2 = cfg80211_find_ie(WLAN_EID_SSID, 420 b->information_elements, 421 b->len_information_elements); 422 423 /* Key comparator must use same algorithm in any rb-tree 424 * search function (order is important), otherwise ordering 425 * of items in the tree is broken and search gives incorrect 426 * results. This code uses same order as cmp_ies() does. */ 427 428 /* sort missing IE before (left of) present IE */ 429 if (!ie1) 430 return -1; 431 if (!ie2) 432 return 1; 433 434 /* zero-size SSID is used as an indication of the hidden bss */ 435 if (!ie2[1]) 436 return 0; 437 438 /* sort by length first, then by contents */ 439 if (ie1[1] != ie2[1]) 440 return ie2[1] - ie1[1]; 441 442 /* zeroed SSID ie is another indication of a hidden bss */ 443 for (i = 0; i < ie2[1]; i++) 444 if (ie2[i + 2]) 445 return -1; 446 447 return 0; 448 } 449 450 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 451 struct ieee80211_channel *channel, 452 const u8 *bssid, 453 const u8 *ssid, size_t ssid_len, 454 u16 capa_mask, u16 capa_val) 455 { 456 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 457 struct cfg80211_internal_bss *bss, *res = NULL; 458 unsigned long now = jiffies; 459 460 spin_lock_bh(&dev->bss_lock); 461 462 list_for_each_entry(bss, &dev->bss_list, list) { 463 if ((bss->pub.capability & capa_mask) != capa_val) 464 continue; 465 if (channel && bss->pub.channel != channel) 466 continue; 467 /* Don't get expired BSS structs */ 468 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 469 !atomic_read(&bss->hold)) 470 continue; 471 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 472 res = bss; 473 kref_get(&res->ref); 474 break; 475 } 476 } 477 478 spin_unlock_bh(&dev->bss_lock); 479 if (!res) 480 return NULL; 481 return &res->pub; 482 } 483 EXPORT_SYMBOL(cfg80211_get_bss); 484 485 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 486 struct ieee80211_channel *channel, 487 const u8 *meshid, size_t meshidlen, 488 const u8 *meshcfg) 489 { 490 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 491 struct cfg80211_internal_bss *bss, *res = NULL; 492 493 spin_lock_bh(&dev->bss_lock); 494 495 list_for_each_entry(bss, &dev->bss_list, list) { 496 if (channel && bss->pub.channel != channel) 497 continue; 498 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 499 res = bss; 500 kref_get(&res->ref); 501 break; 502 } 503 } 504 505 spin_unlock_bh(&dev->bss_lock); 506 if (!res) 507 return NULL; 508 return &res->pub; 509 } 510 EXPORT_SYMBOL(cfg80211_get_mesh); 511 512 513 static void rb_insert_bss(struct cfg80211_registered_device *dev, 514 struct cfg80211_internal_bss *bss) 515 { 516 struct rb_node **p = &dev->bss_tree.rb_node; 517 struct rb_node *parent = NULL; 518 struct cfg80211_internal_bss *tbss; 519 int cmp; 520 521 while (*p) { 522 parent = *p; 523 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 524 525 cmp = cmp_bss(&bss->pub, &tbss->pub); 526 527 if (WARN_ON(!cmp)) { 528 /* will sort of leak this BSS */ 529 return; 530 } 531 532 if (cmp < 0) 533 p = &(*p)->rb_left; 534 else 535 p = &(*p)->rb_right; 536 } 537 538 rb_link_node(&bss->rbn, parent, p); 539 rb_insert_color(&bss->rbn, &dev->bss_tree); 540 } 541 542 static struct cfg80211_internal_bss * 543 rb_find_bss(struct cfg80211_registered_device *dev, 544 struct cfg80211_internal_bss *res) 545 { 546 struct rb_node *n = dev->bss_tree.rb_node; 547 struct cfg80211_internal_bss *bss; 548 int r; 549 550 while (n) { 551 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 552 r = cmp_bss(&res->pub, &bss->pub); 553 554 if (r == 0) 555 return bss; 556 else if (r < 0) 557 n = n->rb_left; 558 else 559 n = n->rb_right; 560 } 561 562 return NULL; 563 } 564 565 static struct cfg80211_internal_bss * 566 rb_find_hidden_bss(struct cfg80211_registered_device *dev, 567 struct cfg80211_internal_bss *res) 568 { 569 struct rb_node *n = dev->bss_tree.rb_node; 570 struct cfg80211_internal_bss *bss; 571 int r; 572 573 while (n) { 574 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 575 r = cmp_hidden_bss(&res->pub, &bss->pub); 576 577 if (r == 0) 578 return bss; 579 else if (r < 0) 580 n = n->rb_left; 581 else 582 n = n->rb_right; 583 } 584 585 return NULL; 586 } 587 588 static void 589 copy_hidden_ies(struct cfg80211_internal_bss *res, 590 struct cfg80211_internal_bss *hidden) 591 { 592 if (unlikely(res->pub.beacon_ies)) 593 return; 594 if (WARN_ON(!hidden->pub.beacon_ies)) 595 return; 596 597 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC); 598 if (unlikely(!res->pub.beacon_ies)) 599 return; 600 601 res->beacon_ies_allocated = true; 602 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies; 603 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies, 604 res->pub.len_beacon_ies); 605 } 606 607 static struct cfg80211_internal_bss * 608 cfg80211_bss_update(struct cfg80211_registered_device *dev, 609 struct cfg80211_internal_bss *res) 610 { 611 struct cfg80211_internal_bss *found = NULL; 612 613 /* 614 * The reference to "res" is donated to this function. 615 */ 616 617 if (WARN_ON(!res->pub.channel)) { 618 kref_put(&res->ref, bss_release); 619 return NULL; 620 } 621 622 res->ts = jiffies; 623 624 spin_lock_bh(&dev->bss_lock); 625 626 found = rb_find_bss(dev, res); 627 628 if (found) { 629 found->pub.beacon_interval = res->pub.beacon_interval; 630 found->pub.tsf = res->pub.tsf; 631 found->pub.signal = res->pub.signal; 632 found->pub.capability = res->pub.capability; 633 found->ts = res->ts; 634 635 /* Update IEs */ 636 if (res->pub.proberesp_ies) { 637 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 638 size_t ielen = res->pub.len_proberesp_ies; 639 640 if (found->pub.proberesp_ies && 641 !found->proberesp_ies_allocated && 642 ksize(found) >= used + ielen) { 643 memcpy(found->pub.proberesp_ies, 644 res->pub.proberesp_ies, ielen); 645 found->pub.len_proberesp_ies = ielen; 646 } else { 647 u8 *ies = found->pub.proberesp_ies; 648 649 if (found->proberesp_ies_allocated) 650 ies = krealloc(ies, ielen, GFP_ATOMIC); 651 else 652 ies = kmalloc(ielen, GFP_ATOMIC); 653 654 if (ies) { 655 memcpy(ies, res->pub.proberesp_ies, 656 ielen); 657 found->proberesp_ies_allocated = true; 658 found->pub.proberesp_ies = ies; 659 found->pub.len_proberesp_ies = ielen; 660 } 661 } 662 663 /* Override possible earlier Beacon frame IEs */ 664 found->pub.information_elements = 665 found->pub.proberesp_ies; 666 found->pub.len_information_elements = 667 found->pub.len_proberesp_ies; 668 } 669 if (res->pub.beacon_ies) { 670 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 671 size_t ielen = res->pub.len_beacon_ies; 672 bool information_elements_is_beacon_ies = 673 (found->pub.information_elements == 674 found->pub.beacon_ies); 675 676 if (found->pub.beacon_ies && 677 !found->beacon_ies_allocated && 678 ksize(found) >= used + ielen) { 679 memcpy(found->pub.beacon_ies, 680 res->pub.beacon_ies, ielen); 681 found->pub.len_beacon_ies = ielen; 682 } else { 683 u8 *ies = found->pub.beacon_ies; 684 685 if (found->beacon_ies_allocated) 686 ies = krealloc(ies, ielen, GFP_ATOMIC); 687 else 688 ies = kmalloc(ielen, GFP_ATOMIC); 689 690 if (ies) { 691 memcpy(ies, res->pub.beacon_ies, 692 ielen); 693 found->beacon_ies_allocated = true; 694 found->pub.beacon_ies = ies; 695 found->pub.len_beacon_ies = ielen; 696 } 697 } 698 699 /* Override IEs if they were from a beacon before */ 700 if (information_elements_is_beacon_ies) { 701 found->pub.information_elements = 702 found->pub.beacon_ies; 703 found->pub.len_information_elements = 704 found->pub.len_beacon_ies; 705 } 706 } 707 708 kref_put(&res->ref, bss_release); 709 } else { 710 struct cfg80211_internal_bss *hidden; 711 712 /* First check if the beacon is a probe response from 713 * a hidden bss. If so, copy beacon ies (with nullified 714 * ssid) into the probe response bss entry (with real ssid). 715 * It is required basically for PSM implementation 716 * (probe responses do not contain tim ie) */ 717 718 /* TODO: The code is not trying to update existing probe 719 * response bss entries when beacon ies are 720 * getting changed. */ 721 hidden = rb_find_hidden_bss(dev, res); 722 if (hidden) 723 copy_hidden_ies(res, hidden); 724 725 /* this "consumes" the reference */ 726 list_add_tail(&res->list, &dev->bss_list); 727 rb_insert_bss(dev, res); 728 found = res; 729 } 730 731 dev->bss_generation++; 732 spin_unlock_bh(&dev->bss_lock); 733 734 kref_get(&found->ref); 735 return found; 736 } 737 738 struct cfg80211_bss* 739 cfg80211_inform_bss(struct wiphy *wiphy, 740 struct ieee80211_channel *channel, 741 const u8 *bssid, u64 tsf, u16 capability, 742 u16 beacon_interval, const u8 *ie, size_t ielen, 743 s32 signal, gfp_t gfp) 744 { 745 struct cfg80211_internal_bss *res; 746 size_t privsz; 747 748 if (WARN_ON(!wiphy)) 749 return NULL; 750 751 privsz = wiphy->bss_priv_size; 752 753 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 754 (signal < 0 || signal > 100))) 755 return NULL; 756 757 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 758 if (!res) 759 return NULL; 760 761 memcpy(res->pub.bssid, bssid, ETH_ALEN); 762 res->pub.channel = channel; 763 res->pub.signal = signal; 764 res->pub.tsf = tsf; 765 res->pub.beacon_interval = beacon_interval; 766 res->pub.capability = capability; 767 /* 768 * Since we do not know here whether the IEs are from a Beacon or Probe 769 * Response frame, we need to pick one of the options and only use it 770 * with the driver that does not provide the full Beacon/Probe Response 771 * frame. Use Beacon frame pointer to avoid indicating that this should 772 * override the information_elements pointer should we have received an 773 * earlier indication of Probe Response data. 774 * 775 * The initial buffer for the IEs is allocated with the BSS entry and 776 * is located after the private area. 777 */ 778 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 779 memcpy(res->pub.beacon_ies, ie, ielen); 780 res->pub.len_beacon_ies = ielen; 781 res->pub.information_elements = res->pub.beacon_ies; 782 res->pub.len_information_elements = res->pub.len_beacon_ies; 783 784 kref_init(&res->ref); 785 786 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 787 if (!res) 788 return NULL; 789 790 if (res->pub.capability & WLAN_CAPABILITY_ESS) 791 regulatory_hint_found_beacon(wiphy, channel, gfp); 792 793 /* cfg80211_bss_update gives us a referenced result */ 794 return &res->pub; 795 } 796 EXPORT_SYMBOL(cfg80211_inform_bss); 797 798 struct cfg80211_bss * 799 cfg80211_inform_bss_frame(struct wiphy *wiphy, 800 struct ieee80211_channel *channel, 801 struct ieee80211_mgmt *mgmt, size_t len, 802 s32 signal, gfp_t gfp) 803 { 804 struct cfg80211_internal_bss *res; 805 size_t ielen = len - offsetof(struct ieee80211_mgmt, 806 u.probe_resp.variable); 807 size_t privsz; 808 809 if (WARN_ON(!mgmt)) 810 return NULL; 811 812 if (WARN_ON(!wiphy)) 813 return NULL; 814 815 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 816 (signal < 0 || signal > 100))) 817 return NULL; 818 819 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 820 return NULL; 821 822 privsz = wiphy->bss_priv_size; 823 824 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 825 if (!res) 826 return NULL; 827 828 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 829 res->pub.channel = channel; 830 res->pub.signal = signal; 831 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 832 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 833 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 834 /* 835 * The initial buffer for the IEs is allocated with the BSS entry and 836 * is located after the private area. 837 */ 838 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 839 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 840 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 841 ielen); 842 res->pub.len_proberesp_ies = ielen; 843 res->pub.information_elements = res->pub.proberesp_ies; 844 res->pub.len_information_elements = res->pub.len_proberesp_ies; 845 } else { 846 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 847 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 848 res->pub.len_beacon_ies = ielen; 849 res->pub.information_elements = res->pub.beacon_ies; 850 res->pub.len_information_elements = res->pub.len_beacon_ies; 851 } 852 853 kref_init(&res->ref); 854 855 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 856 if (!res) 857 return NULL; 858 859 if (res->pub.capability & WLAN_CAPABILITY_ESS) 860 regulatory_hint_found_beacon(wiphy, channel, gfp); 861 862 /* cfg80211_bss_update gives us a referenced result */ 863 return &res->pub; 864 } 865 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 866 867 void cfg80211_ref_bss(struct cfg80211_bss *pub) 868 { 869 struct cfg80211_internal_bss *bss; 870 871 if (!pub) 872 return; 873 874 bss = container_of(pub, struct cfg80211_internal_bss, pub); 875 kref_get(&bss->ref); 876 } 877 EXPORT_SYMBOL(cfg80211_ref_bss); 878 879 void cfg80211_put_bss(struct cfg80211_bss *pub) 880 { 881 struct cfg80211_internal_bss *bss; 882 883 if (!pub) 884 return; 885 886 bss = container_of(pub, struct cfg80211_internal_bss, pub); 887 kref_put(&bss->ref, bss_release); 888 } 889 EXPORT_SYMBOL(cfg80211_put_bss); 890 891 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 892 { 893 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 894 struct cfg80211_internal_bss *bss; 895 896 if (WARN_ON(!pub)) 897 return; 898 899 bss = container_of(pub, struct cfg80211_internal_bss, pub); 900 901 spin_lock_bh(&dev->bss_lock); 902 if (!list_empty(&bss->list)) { 903 __cfg80211_unlink_bss(dev, bss); 904 dev->bss_generation++; 905 } 906 spin_unlock_bh(&dev->bss_lock); 907 } 908 EXPORT_SYMBOL(cfg80211_unlink_bss); 909 910 #ifdef CONFIG_CFG80211_WEXT 911 int cfg80211_wext_siwscan(struct net_device *dev, 912 struct iw_request_info *info, 913 union iwreq_data *wrqu, char *extra) 914 { 915 struct cfg80211_registered_device *rdev; 916 struct wiphy *wiphy; 917 struct iw_scan_req *wreq = NULL; 918 struct cfg80211_scan_request *creq = NULL; 919 int i, err, n_channels = 0; 920 enum ieee80211_band band; 921 922 if (!netif_running(dev)) 923 return -ENETDOWN; 924 925 if (wrqu->data.length == sizeof(struct iw_scan_req)) 926 wreq = (struct iw_scan_req *)extra; 927 928 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 929 930 if (IS_ERR(rdev)) 931 return PTR_ERR(rdev); 932 933 if (rdev->scan_req) { 934 err = -EBUSY; 935 goto out; 936 } 937 938 wiphy = &rdev->wiphy; 939 940 /* Determine number of channels, needed to allocate creq */ 941 if (wreq && wreq->num_channels) 942 n_channels = wreq->num_channels; 943 else { 944 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 945 if (wiphy->bands[band]) 946 n_channels += wiphy->bands[band]->n_channels; 947 } 948 949 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 950 n_channels * sizeof(void *), 951 GFP_ATOMIC); 952 if (!creq) { 953 err = -ENOMEM; 954 goto out; 955 } 956 957 creq->wiphy = wiphy; 958 creq->dev = dev; 959 /* SSIDs come after channels */ 960 creq->ssids = (void *)&creq->channels[n_channels]; 961 creq->n_channels = n_channels; 962 creq->n_ssids = 1; 963 964 /* translate "Scan on frequencies" request */ 965 i = 0; 966 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 967 int j; 968 969 if (!wiphy->bands[band]) 970 continue; 971 972 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 973 /* ignore disabled channels */ 974 if (wiphy->bands[band]->channels[j].flags & 975 IEEE80211_CHAN_DISABLED) 976 continue; 977 978 /* If we have a wireless request structure and the 979 * wireless request specifies frequencies, then search 980 * for the matching hardware channel. 981 */ 982 if (wreq && wreq->num_channels) { 983 int k; 984 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 985 for (k = 0; k < wreq->num_channels; k++) { 986 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 987 if (wext_freq == wiphy_freq) 988 goto wext_freq_found; 989 } 990 goto wext_freq_not_found; 991 } 992 993 wext_freq_found: 994 creq->channels[i] = &wiphy->bands[band]->channels[j]; 995 i++; 996 wext_freq_not_found: ; 997 } 998 } 999 /* No channels found? */ 1000 if (!i) { 1001 err = -EINVAL; 1002 goto out; 1003 } 1004 1005 /* Set real number of channels specified in creq->channels[] */ 1006 creq->n_channels = i; 1007 1008 /* translate "Scan for SSID" request */ 1009 if (wreq) { 1010 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1011 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1012 err = -EINVAL; 1013 goto out; 1014 } 1015 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1016 creq->ssids[0].ssid_len = wreq->essid_len; 1017 } 1018 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1019 creq->n_ssids = 0; 1020 } 1021 1022 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1023 if (wiphy->bands[i]) 1024 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1025 1026 rdev->scan_req = creq; 1027 err = rdev->ops->scan(wiphy, dev, creq); 1028 if (err) { 1029 rdev->scan_req = NULL; 1030 /* creq will be freed below */ 1031 } else { 1032 nl80211_send_scan_start(rdev, dev); 1033 /* creq now owned by driver */ 1034 creq = NULL; 1035 dev_hold(dev); 1036 } 1037 out: 1038 kfree(creq); 1039 cfg80211_unlock_rdev(rdev); 1040 return err; 1041 } 1042 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1043 1044 static void ieee80211_scan_add_ies(struct iw_request_info *info, 1045 struct cfg80211_bss *bss, 1046 char **current_ev, char *end_buf) 1047 { 1048 u8 *pos, *end, *next; 1049 struct iw_event iwe; 1050 1051 if (!bss->information_elements || 1052 !bss->len_information_elements) 1053 return; 1054 1055 /* 1056 * If needed, fragment the IEs buffer (at IE boundaries) into short 1057 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1058 */ 1059 pos = bss->information_elements; 1060 end = pos + bss->len_information_elements; 1061 1062 while (end - pos > IW_GENERIC_IE_MAX) { 1063 next = pos + 2 + pos[1]; 1064 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1065 next = next + 2 + next[1]; 1066 1067 memset(&iwe, 0, sizeof(iwe)); 1068 iwe.cmd = IWEVGENIE; 1069 iwe.u.data.length = next - pos; 1070 *current_ev = iwe_stream_add_point(info, *current_ev, 1071 end_buf, &iwe, pos); 1072 1073 pos = next; 1074 } 1075 1076 if (end > pos) { 1077 memset(&iwe, 0, sizeof(iwe)); 1078 iwe.cmd = IWEVGENIE; 1079 iwe.u.data.length = end - pos; 1080 *current_ev = iwe_stream_add_point(info, *current_ev, 1081 end_buf, &iwe, pos); 1082 } 1083 } 1084 1085 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 1086 { 1087 unsigned long end = jiffies; 1088 1089 if (end >= start) 1090 return jiffies_to_msecs(end - start); 1091 1092 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 1093 } 1094 1095 static char * 1096 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1097 struct cfg80211_internal_bss *bss, char *current_ev, 1098 char *end_buf) 1099 { 1100 struct iw_event iwe; 1101 u8 *buf, *cfg, *p; 1102 u8 *ie = bss->pub.information_elements; 1103 int rem = bss->pub.len_information_elements, i, sig; 1104 bool ismesh = false; 1105 1106 memset(&iwe, 0, sizeof(iwe)); 1107 iwe.cmd = SIOCGIWAP; 1108 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1109 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1110 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1111 IW_EV_ADDR_LEN); 1112 1113 memset(&iwe, 0, sizeof(iwe)); 1114 iwe.cmd = SIOCGIWFREQ; 1115 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1116 iwe.u.freq.e = 0; 1117 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1118 IW_EV_FREQ_LEN); 1119 1120 memset(&iwe, 0, sizeof(iwe)); 1121 iwe.cmd = SIOCGIWFREQ; 1122 iwe.u.freq.m = bss->pub.channel->center_freq; 1123 iwe.u.freq.e = 6; 1124 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1125 IW_EV_FREQ_LEN); 1126 1127 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1128 memset(&iwe, 0, sizeof(iwe)); 1129 iwe.cmd = IWEVQUAL; 1130 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1131 IW_QUAL_NOISE_INVALID | 1132 IW_QUAL_QUAL_UPDATED; 1133 switch (wiphy->signal_type) { 1134 case CFG80211_SIGNAL_TYPE_MBM: 1135 sig = bss->pub.signal / 100; 1136 iwe.u.qual.level = sig; 1137 iwe.u.qual.updated |= IW_QUAL_DBM; 1138 if (sig < -110) /* rather bad */ 1139 sig = -110; 1140 else if (sig > -40) /* perfect */ 1141 sig = -40; 1142 /* will give a range of 0 .. 70 */ 1143 iwe.u.qual.qual = sig + 110; 1144 break; 1145 case CFG80211_SIGNAL_TYPE_UNSPEC: 1146 iwe.u.qual.level = bss->pub.signal; 1147 /* will give range 0 .. 100 */ 1148 iwe.u.qual.qual = bss->pub.signal; 1149 break; 1150 default: 1151 /* not reached */ 1152 break; 1153 } 1154 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1155 &iwe, IW_EV_QUAL_LEN); 1156 } 1157 1158 memset(&iwe, 0, sizeof(iwe)); 1159 iwe.cmd = SIOCGIWENCODE; 1160 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1161 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1162 else 1163 iwe.u.data.flags = IW_ENCODE_DISABLED; 1164 iwe.u.data.length = 0; 1165 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1166 &iwe, ""); 1167 1168 while (rem >= 2) { 1169 /* invalid data */ 1170 if (ie[1] > rem - 2) 1171 break; 1172 1173 switch (ie[0]) { 1174 case WLAN_EID_SSID: 1175 memset(&iwe, 0, sizeof(iwe)); 1176 iwe.cmd = SIOCGIWESSID; 1177 iwe.u.data.length = ie[1]; 1178 iwe.u.data.flags = 1; 1179 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1180 &iwe, ie + 2); 1181 break; 1182 case WLAN_EID_MESH_ID: 1183 memset(&iwe, 0, sizeof(iwe)); 1184 iwe.cmd = SIOCGIWESSID; 1185 iwe.u.data.length = ie[1]; 1186 iwe.u.data.flags = 1; 1187 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1188 &iwe, ie + 2); 1189 break; 1190 case WLAN_EID_MESH_CONFIG: 1191 ismesh = true; 1192 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1193 break; 1194 buf = kmalloc(50, GFP_ATOMIC); 1195 if (!buf) 1196 break; 1197 cfg = ie + 2; 1198 memset(&iwe, 0, sizeof(iwe)); 1199 iwe.cmd = IWEVCUSTOM; 1200 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1201 "0x%02X", cfg[0]); 1202 iwe.u.data.length = strlen(buf); 1203 current_ev = iwe_stream_add_point(info, current_ev, 1204 end_buf, 1205 &iwe, buf); 1206 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1207 cfg[1]); 1208 iwe.u.data.length = strlen(buf); 1209 current_ev = iwe_stream_add_point(info, current_ev, 1210 end_buf, 1211 &iwe, buf); 1212 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1213 cfg[2]); 1214 iwe.u.data.length = strlen(buf); 1215 current_ev = iwe_stream_add_point(info, current_ev, 1216 end_buf, 1217 &iwe, buf); 1218 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1219 iwe.u.data.length = strlen(buf); 1220 current_ev = iwe_stream_add_point(info, current_ev, 1221 end_buf, 1222 &iwe, buf); 1223 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1224 iwe.u.data.length = strlen(buf); 1225 current_ev = iwe_stream_add_point(info, current_ev, 1226 end_buf, 1227 &iwe, buf); 1228 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1229 iwe.u.data.length = strlen(buf); 1230 current_ev = iwe_stream_add_point(info, current_ev, 1231 end_buf, 1232 &iwe, buf); 1233 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1234 iwe.u.data.length = strlen(buf); 1235 current_ev = iwe_stream_add_point(info, current_ev, 1236 end_buf, 1237 &iwe, buf); 1238 kfree(buf); 1239 break; 1240 case WLAN_EID_SUPP_RATES: 1241 case WLAN_EID_EXT_SUPP_RATES: 1242 /* display all supported rates in readable format */ 1243 p = current_ev + iwe_stream_lcp_len(info); 1244 1245 memset(&iwe, 0, sizeof(iwe)); 1246 iwe.cmd = SIOCGIWRATE; 1247 /* Those two flags are ignored... */ 1248 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1249 1250 for (i = 0; i < ie[1]; i++) { 1251 iwe.u.bitrate.value = 1252 ((ie[i + 2] & 0x7f) * 500000); 1253 p = iwe_stream_add_value(info, current_ev, p, 1254 end_buf, &iwe, IW_EV_PARAM_LEN); 1255 } 1256 current_ev = p; 1257 break; 1258 } 1259 rem -= ie[1] + 2; 1260 ie += ie[1] + 2; 1261 } 1262 1263 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1264 ismesh) { 1265 memset(&iwe, 0, sizeof(iwe)); 1266 iwe.cmd = SIOCGIWMODE; 1267 if (ismesh) 1268 iwe.u.mode = IW_MODE_MESH; 1269 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1270 iwe.u.mode = IW_MODE_MASTER; 1271 else 1272 iwe.u.mode = IW_MODE_ADHOC; 1273 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1274 &iwe, IW_EV_UINT_LEN); 1275 } 1276 1277 buf = kmalloc(30, GFP_ATOMIC); 1278 if (buf) { 1279 memset(&iwe, 0, sizeof(iwe)); 1280 iwe.cmd = IWEVCUSTOM; 1281 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1282 iwe.u.data.length = strlen(buf); 1283 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1284 &iwe, buf); 1285 memset(&iwe, 0, sizeof(iwe)); 1286 iwe.cmd = IWEVCUSTOM; 1287 sprintf(buf, " Last beacon: %ums ago", 1288 elapsed_jiffies_msecs(bss->ts)); 1289 iwe.u.data.length = strlen(buf); 1290 current_ev = iwe_stream_add_point(info, current_ev, 1291 end_buf, &iwe, buf); 1292 kfree(buf); 1293 } 1294 1295 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1296 1297 return current_ev; 1298 } 1299 1300 1301 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1302 struct iw_request_info *info, 1303 char *buf, size_t len) 1304 { 1305 char *current_ev = buf; 1306 char *end_buf = buf + len; 1307 struct cfg80211_internal_bss *bss; 1308 1309 spin_lock_bh(&dev->bss_lock); 1310 cfg80211_bss_expire(dev); 1311 1312 list_for_each_entry(bss, &dev->bss_list, list) { 1313 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1314 spin_unlock_bh(&dev->bss_lock); 1315 return -E2BIG; 1316 } 1317 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1318 current_ev, end_buf); 1319 } 1320 spin_unlock_bh(&dev->bss_lock); 1321 return current_ev - buf; 1322 } 1323 1324 1325 int cfg80211_wext_giwscan(struct net_device *dev, 1326 struct iw_request_info *info, 1327 struct iw_point *data, char *extra) 1328 { 1329 struct cfg80211_registered_device *rdev; 1330 int res; 1331 1332 if (!netif_running(dev)) 1333 return -ENETDOWN; 1334 1335 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1336 1337 if (IS_ERR(rdev)) 1338 return PTR_ERR(rdev); 1339 1340 if (rdev->scan_req) { 1341 res = -EAGAIN; 1342 goto out; 1343 } 1344 1345 res = ieee80211_scan_results(rdev, info, extra, data->length); 1346 data->length = 0; 1347 if (res >= 0) { 1348 data->length = res; 1349 res = 0; 1350 } 1351 1352 out: 1353 cfg80211_unlock_rdev(rdev); 1354 return res; 1355 } 1356 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1357 #endif 1358