scan.c revision ac422d3cc25351819ec80b7e2852fd2c600c317c
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 23void ___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 76void __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 88void 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} 95EXPORT_SYMBOL(cfg80211_scan_done); 96 97void __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 114void 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} 121EXPORT_SYMBOL(cfg80211_sched_scan_results); 122 123void 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} 131EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 132 133int __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 159static 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! */ 178void 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! */ 190static 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! */ 199void 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 217const 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} 229EXPORT_SYMBOL(cfg80211_find_ie); 230 231const 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} 256EXPORT_SYMBOL(cfg80211_find_vendor_ie); 257 258static 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 278static 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 300static 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 322static 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 358static 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 compare_ether_addr(a->bssid, b->bssid); 382} 383 384static 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 400static 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 446struct 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} 479EXPORT_SYMBOL(cfg80211_get_bss); 480 481struct 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} 506EXPORT_SYMBOL(cfg80211_get_mesh); 507 508 509static 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 538static struct cfg80211_internal_bss * 539rb_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 561static struct cfg80211_internal_bss * 562rb_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 584static void 585copy_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 603static struct cfg80211_internal_bss * 604cfg80211_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 734struct cfg80211_bss* 735cfg80211_inform_bss(struct wiphy *wiphy, 736 struct ieee80211_channel *channel, 737 const u8 *bssid, u64 tsf, u16 capability, 738 u16 beacon_interval, const u8 *ie, size_t ielen, 739 s32 signal, gfp_t gfp) 740{ 741 struct cfg80211_internal_bss *res; 742 size_t privsz; 743 744 if (WARN_ON(!wiphy)) 745 return NULL; 746 747 privsz = wiphy->bss_priv_size; 748 749 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 750 (signal < 0 || signal > 100))) 751 return NULL; 752 753 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 754 if (!res) 755 return NULL; 756 757 memcpy(res->pub.bssid, bssid, ETH_ALEN); 758 res->pub.channel = channel; 759 res->pub.signal = signal; 760 res->pub.tsf = tsf; 761 res->pub.beacon_interval = beacon_interval; 762 res->pub.capability = capability; 763 /* 764 * Since we do not know here whether the IEs are from a Beacon or Probe 765 * Response frame, we need to pick one of the options and only use it 766 * with the driver that does not provide the full Beacon/Probe Response 767 * frame. Use Beacon frame pointer to avoid indicating that this should 768 * override the information_elements pointer should we have received an 769 * earlier indication of Probe Response data. 770 * 771 * The initial buffer for the IEs is allocated with the BSS entry and 772 * is located after the private area. 773 */ 774 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 775 memcpy(res->pub.beacon_ies, ie, ielen); 776 res->pub.len_beacon_ies = ielen; 777 res->pub.information_elements = res->pub.beacon_ies; 778 res->pub.len_information_elements = res->pub.len_beacon_ies; 779 780 kref_init(&res->ref); 781 782 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 783 if (!res) 784 return NULL; 785 786 if (res->pub.capability & WLAN_CAPABILITY_ESS) 787 regulatory_hint_found_beacon(wiphy, channel, gfp); 788 789 /* cfg80211_bss_update gives us a referenced result */ 790 return &res->pub; 791} 792EXPORT_SYMBOL(cfg80211_inform_bss); 793 794struct cfg80211_bss * 795cfg80211_inform_bss_frame(struct wiphy *wiphy, 796 struct ieee80211_channel *channel, 797 struct ieee80211_mgmt *mgmt, size_t len, 798 s32 signal, gfp_t gfp) 799{ 800 struct cfg80211_internal_bss *res; 801 size_t ielen = len - offsetof(struct ieee80211_mgmt, 802 u.probe_resp.variable); 803 size_t privsz; 804 805 if (WARN_ON(!mgmt)) 806 return NULL; 807 808 if (WARN_ON(!wiphy)) 809 return NULL; 810 811 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 812 (signal < 0 || signal > 100))) 813 return NULL; 814 815 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 816 return NULL; 817 818 privsz = wiphy->bss_priv_size; 819 820 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 821 if (!res) 822 return NULL; 823 824 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 825 res->pub.channel = channel; 826 res->pub.signal = signal; 827 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 828 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 829 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 830 /* 831 * The initial buffer for the IEs is allocated with the BSS entry and 832 * is located after the private area. 833 */ 834 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 835 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 836 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 837 ielen); 838 res->pub.len_proberesp_ies = ielen; 839 res->pub.information_elements = res->pub.proberesp_ies; 840 res->pub.len_information_elements = res->pub.len_proberesp_ies; 841 } else { 842 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 843 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 844 res->pub.len_beacon_ies = ielen; 845 res->pub.information_elements = res->pub.beacon_ies; 846 res->pub.len_information_elements = res->pub.len_beacon_ies; 847 } 848 849 kref_init(&res->ref); 850 851 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 852 if (!res) 853 return NULL; 854 855 if (res->pub.capability & WLAN_CAPABILITY_ESS) 856 regulatory_hint_found_beacon(wiphy, channel, gfp); 857 858 /* cfg80211_bss_update gives us a referenced result */ 859 return &res->pub; 860} 861EXPORT_SYMBOL(cfg80211_inform_bss_frame); 862 863void cfg80211_ref_bss(struct cfg80211_bss *pub) 864{ 865 struct cfg80211_internal_bss *bss; 866 867 if (!pub) 868 return; 869 870 bss = container_of(pub, struct cfg80211_internal_bss, pub); 871 kref_get(&bss->ref); 872} 873EXPORT_SYMBOL(cfg80211_ref_bss); 874 875void cfg80211_put_bss(struct cfg80211_bss *pub) 876{ 877 struct cfg80211_internal_bss *bss; 878 879 if (!pub) 880 return; 881 882 bss = container_of(pub, struct cfg80211_internal_bss, pub); 883 kref_put(&bss->ref, bss_release); 884} 885EXPORT_SYMBOL(cfg80211_put_bss); 886 887void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 888{ 889 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 890 struct cfg80211_internal_bss *bss; 891 892 if (WARN_ON(!pub)) 893 return; 894 895 bss = container_of(pub, struct cfg80211_internal_bss, pub); 896 897 spin_lock_bh(&dev->bss_lock); 898 if (!list_empty(&bss->list)) { 899 __cfg80211_unlink_bss(dev, bss); 900 dev->bss_generation++; 901 } 902 spin_unlock_bh(&dev->bss_lock); 903} 904EXPORT_SYMBOL(cfg80211_unlink_bss); 905 906#ifdef CONFIG_CFG80211_WEXT 907int cfg80211_wext_siwscan(struct net_device *dev, 908 struct iw_request_info *info, 909 union iwreq_data *wrqu, char *extra) 910{ 911 struct cfg80211_registered_device *rdev; 912 struct wiphy *wiphy; 913 struct iw_scan_req *wreq = NULL; 914 struct cfg80211_scan_request *creq = NULL; 915 int i, err, n_channels = 0; 916 enum ieee80211_band band; 917 918 if (!netif_running(dev)) 919 return -ENETDOWN; 920 921 if (wrqu->data.length == sizeof(struct iw_scan_req)) 922 wreq = (struct iw_scan_req *)extra; 923 924 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 925 926 if (IS_ERR(rdev)) 927 return PTR_ERR(rdev); 928 929 if (rdev->scan_req) { 930 err = -EBUSY; 931 goto out; 932 } 933 934 wiphy = &rdev->wiphy; 935 936 /* Determine number of channels, needed to allocate creq */ 937 if (wreq && wreq->num_channels) 938 n_channels = wreq->num_channels; 939 else { 940 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 941 if (wiphy->bands[band]) 942 n_channels += wiphy->bands[band]->n_channels; 943 } 944 945 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 946 n_channels * sizeof(void *), 947 GFP_ATOMIC); 948 if (!creq) { 949 err = -ENOMEM; 950 goto out; 951 } 952 953 creq->wiphy = wiphy; 954 creq->dev = dev; 955 /* SSIDs come after channels */ 956 creq->ssids = (void *)&creq->channels[n_channels]; 957 creq->n_channels = n_channels; 958 creq->n_ssids = 1; 959 960 /* translate "Scan on frequencies" request */ 961 i = 0; 962 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 963 int j; 964 965 if (!wiphy->bands[band]) 966 continue; 967 968 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 969 /* ignore disabled channels */ 970 if (wiphy->bands[band]->channels[j].flags & 971 IEEE80211_CHAN_DISABLED) 972 continue; 973 974 /* If we have a wireless request structure and the 975 * wireless request specifies frequencies, then search 976 * for the matching hardware channel. 977 */ 978 if (wreq && wreq->num_channels) { 979 int k; 980 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 981 for (k = 0; k < wreq->num_channels; k++) { 982 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 983 if (wext_freq == wiphy_freq) 984 goto wext_freq_found; 985 } 986 goto wext_freq_not_found; 987 } 988 989 wext_freq_found: 990 creq->channels[i] = &wiphy->bands[band]->channels[j]; 991 i++; 992 wext_freq_not_found: ; 993 } 994 } 995 /* No channels found? */ 996 if (!i) { 997 err = -EINVAL; 998 goto out; 999 } 1000 1001 /* Set real number of channels specified in creq->channels[] */ 1002 creq->n_channels = i; 1003 1004 /* translate "Scan for SSID" request */ 1005 if (wreq) { 1006 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1007 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1008 err = -EINVAL; 1009 goto out; 1010 } 1011 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1012 creq->ssids[0].ssid_len = wreq->essid_len; 1013 } 1014 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1015 creq->n_ssids = 0; 1016 } 1017 1018 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1019 if (wiphy->bands[i]) 1020 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1021 1022 rdev->scan_req = creq; 1023 err = rdev->ops->scan(wiphy, dev, creq); 1024 if (err) { 1025 rdev->scan_req = NULL; 1026 /* creq will be freed below */ 1027 } else { 1028 nl80211_send_scan_start(rdev, dev); 1029 /* creq now owned by driver */ 1030 creq = NULL; 1031 dev_hold(dev); 1032 } 1033 out: 1034 kfree(creq); 1035 cfg80211_unlock_rdev(rdev); 1036 return err; 1037} 1038EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1039 1040static void ieee80211_scan_add_ies(struct iw_request_info *info, 1041 struct cfg80211_bss *bss, 1042 char **current_ev, char *end_buf) 1043{ 1044 u8 *pos, *end, *next; 1045 struct iw_event iwe; 1046 1047 if (!bss->information_elements || 1048 !bss->len_information_elements) 1049 return; 1050 1051 /* 1052 * If needed, fragment the IEs buffer (at IE boundaries) into short 1053 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1054 */ 1055 pos = bss->information_elements; 1056 end = pos + bss->len_information_elements; 1057 1058 while (end - pos > IW_GENERIC_IE_MAX) { 1059 next = pos + 2 + pos[1]; 1060 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1061 next = next + 2 + next[1]; 1062 1063 memset(&iwe, 0, sizeof(iwe)); 1064 iwe.cmd = IWEVGENIE; 1065 iwe.u.data.length = next - pos; 1066 *current_ev = iwe_stream_add_point(info, *current_ev, 1067 end_buf, &iwe, pos); 1068 1069 pos = next; 1070 } 1071 1072 if (end > pos) { 1073 memset(&iwe, 0, sizeof(iwe)); 1074 iwe.cmd = IWEVGENIE; 1075 iwe.u.data.length = end - pos; 1076 *current_ev = iwe_stream_add_point(info, *current_ev, 1077 end_buf, &iwe, pos); 1078 } 1079} 1080 1081static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 1082{ 1083 unsigned long end = jiffies; 1084 1085 if (end >= start) 1086 return jiffies_to_msecs(end - start); 1087 1088 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 1089} 1090 1091static char * 1092ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1093 struct cfg80211_internal_bss *bss, char *current_ev, 1094 char *end_buf) 1095{ 1096 struct iw_event iwe; 1097 u8 *buf, *cfg, *p; 1098 u8 *ie = bss->pub.information_elements; 1099 int rem = bss->pub.len_information_elements, i, sig; 1100 bool ismesh = false; 1101 1102 memset(&iwe, 0, sizeof(iwe)); 1103 iwe.cmd = SIOCGIWAP; 1104 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1105 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1106 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1107 IW_EV_ADDR_LEN); 1108 1109 memset(&iwe, 0, sizeof(iwe)); 1110 iwe.cmd = SIOCGIWFREQ; 1111 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1112 iwe.u.freq.e = 0; 1113 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1114 IW_EV_FREQ_LEN); 1115 1116 memset(&iwe, 0, sizeof(iwe)); 1117 iwe.cmd = SIOCGIWFREQ; 1118 iwe.u.freq.m = bss->pub.channel->center_freq; 1119 iwe.u.freq.e = 6; 1120 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1121 IW_EV_FREQ_LEN); 1122 1123 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1124 memset(&iwe, 0, sizeof(iwe)); 1125 iwe.cmd = IWEVQUAL; 1126 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1127 IW_QUAL_NOISE_INVALID | 1128 IW_QUAL_QUAL_UPDATED; 1129 switch (wiphy->signal_type) { 1130 case CFG80211_SIGNAL_TYPE_MBM: 1131 sig = bss->pub.signal / 100; 1132 iwe.u.qual.level = sig; 1133 iwe.u.qual.updated |= IW_QUAL_DBM; 1134 if (sig < -110) /* rather bad */ 1135 sig = -110; 1136 else if (sig > -40) /* perfect */ 1137 sig = -40; 1138 /* will give a range of 0 .. 70 */ 1139 iwe.u.qual.qual = sig + 110; 1140 break; 1141 case CFG80211_SIGNAL_TYPE_UNSPEC: 1142 iwe.u.qual.level = bss->pub.signal; 1143 /* will give range 0 .. 100 */ 1144 iwe.u.qual.qual = bss->pub.signal; 1145 break; 1146 default: 1147 /* not reached */ 1148 break; 1149 } 1150 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1151 &iwe, IW_EV_QUAL_LEN); 1152 } 1153 1154 memset(&iwe, 0, sizeof(iwe)); 1155 iwe.cmd = SIOCGIWENCODE; 1156 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1157 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1158 else 1159 iwe.u.data.flags = IW_ENCODE_DISABLED; 1160 iwe.u.data.length = 0; 1161 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1162 &iwe, ""); 1163 1164 while (rem >= 2) { 1165 /* invalid data */ 1166 if (ie[1] > rem - 2) 1167 break; 1168 1169 switch (ie[0]) { 1170 case WLAN_EID_SSID: 1171 memset(&iwe, 0, sizeof(iwe)); 1172 iwe.cmd = SIOCGIWESSID; 1173 iwe.u.data.length = ie[1]; 1174 iwe.u.data.flags = 1; 1175 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1176 &iwe, ie + 2); 1177 break; 1178 case WLAN_EID_MESH_ID: 1179 memset(&iwe, 0, sizeof(iwe)); 1180 iwe.cmd = SIOCGIWESSID; 1181 iwe.u.data.length = ie[1]; 1182 iwe.u.data.flags = 1; 1183 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1184 &iwe, ie + 2); 1185 break; 1186 case WLAN_EID_MESH_CONFIG: 1187 ismesh = true; 1188 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1189 break; 1190 buf = kmalloc(50, GFP_ATOMIC); 1191 if (!buf) 1192 break; 1193 cfg = ie + 2; 1194 memset(&iwe, 0, sizeof(iwe)); 1195 iwe.cmd = IWEVCUSTOM; 1196 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1197 "0x%02X", cfg[0]); 1198 iwe.u.data.length = strlen(buf); 1199 current_ev = iwe_stream_add_point(info, current_ev, 1200 end_buf, 1201 &iwe, buf); 1202 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1203 cfg[1]); 1204 iwe.u.data.length = strlen(buf); 1205 current_ev = iwe_stream_add_point(info, current_ev, 1206 end_buf, 1207 &iwe, buf); 1208 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1209 cfg[2]); 1210 iwe.u.data.length = strlen(buf); 1211 current_ev = iwe_stream_add_point(info, current_ev, 1212 end_buf, 1213 &iwe, buf); 1214 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1215 iwe.u.data.length = strlen(buf); 1216 current_ev = iwe_stream_add_point(info, current_ev, 1217 end_buf, 1218 &iwe, buf); 1219 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1220 iwe.u.data.length = strlen(buf); 1221 current_ev = iwe_stream_add_point(info, current_ev, 1222 end_buf, 1223 &iwe, buf); 1224 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1225 iwe.u.data.length = strlen(buf); 1226 current_ev = iwe_stream_add_point(info, current_ev, 1227 end_buf, 1228 &iwe, buf); 1229 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1230 iwe.u.data.length = strlen(buf); 1231 current_ev = iwe_stream_add_point(info, current_ev, 1232 end_buf, 1233 &iwe, buf); 1234 kfree(buf); 1235 break; 1236 case WLAN_EID_SUPP_RATES: 1237 case WLAN_EID_EXT_SUPP_RATES: 1238 /* display all supported rates in readable format */ 1239 p = current_ev + iwe_stream_lcp_len(info); 1240 1241 memset(&iwe, 0, sizeof(iwe)); 1242 iwe.cmd = SIOCGIWRATE; 1243 /* Those two flags are ignored... */ 1244 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1245 1246 for (i = 0; i < ie[1]; i++) { 1247 iwe.u.bitrate.value = 1248 ((ie[i + 2] & 0x7f) * 500000); 1249 p = iwe_stream_add_value(info, current_ev, p, 1250 end_buf, &iwe, IW_EV_PARAM_LEN); 1251 } 1252 current_ev = p; 1253 break; 1254 } 1255 rem -= ie[1] + 2; 1256 ie += ie[1] + 2; 1257 } 1258 1259 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1260 ismesh) { 1261 memset(&iwe, 0, sizeof(iwe)); 1262 iwe.cmd = SIOCGIWMODE; 1263 if (ismesh) 1264 iwe.u.mode = IW_MODE_MESH; 1265 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1266 iwe.u.mode = IW_MODE_MASTER; 1267 else 1268 iwe.u.mode = IW_MODE_ADHOC; 1269 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1270 &iwe, IW_EV_UINT_LEN); 1271 } 1272 1273 buf = kmalloc(30, GFP_ATOMIC); 1274 if (buf) { 1275 memset(&iwe, 0, sizeof(iwe)); 1276 iwe.cmd = IWEVCUSTOM; 1277 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1278 iwe.u.data.length = strlen(buf); 1279 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1280 &iwe, buf); 1281 memset(&iwe, 0, sizeof(iwe)); 1282 iwe.cmd = IWEVCUSTOM; 1283 sprintf(buf, " Last beacon: %ums ago", 1284 elapsed_jiffies_msecs(bss->ts)); 1285 iwe.u.data.length = strlen(buf); 1286 current_ev = iwe_stream_add_point(info, current_ev, 1287 end_buf, &iwe, buf); 1288 kfree(buf); 1289 } 1290 1291 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1292 1293 return current_ev; 1294} 1295 1296 1297static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1298 struct iw_request_info *info, 1299 char *buf, size_t len) 1300{ 1301 char *current_ev = buf; 1302 char *end_buf = buf + len; 1303 struct cfg80211_internal_bss *bss; 1304 1305 spin_lock_bh(&dev->bss_lock); 1306 cfg80211_bss_expire(dev); 1307 1308 list_for_each_entry(bss, &dev->bss_list, list) { 1309 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1310 spin_unlock_bh(&dev->bss_lock); 1311 return -E2BIG; 1312 } 1313 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1314 current_ev, end_buf); 1315 } 1316 spin_unlock_bh(&dev->bss_lock); 1317 return current_ev - buf; 1318} 1319 1320 1321int cfg80211_wext_giwscan(struct net_device *dev, 1322 struct iw_request_info *info, 1323 struct iw_point *data, char *extra) 1324{ 1325 struct cfg80211_registered_device *rdev; 1326 int res; 1327 1328 if (!netif_running(dev)) 1329 return -ENETDOWN; 1330 1331 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1332 1333 if (IS_ERR(rdev)) 1334 return PTR_ERR(rdev); 1335 1336 if (rdev->scan_req) { 1337 res = -EAGAIN; 1338 goto out; 1339 } 1340 1341 res = ieee80211_scan_results(rdev, info, extra, data->length); 1342 data->length = 0; 1343 if (res >= 0) { 1344 data->length = res; 1345 res = 0; 1346 } 1347 1348 out: 1349 cfg80211_unlock_rdev(rdev); 1350 return res; 1351} 1352EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1353#endif 1354