1/* 2 * cfg80211 scan result handling 3 * 4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2013-2014 Intel Mobile Communications GmbH 6 */ 7#include <linux/kernel.h> 8#include <linux/slab.h> 9#include <linux/module.h> 10#include <linux/netdevice.h> 11#include <linux/wireless.h> 12#include <linux/nl80211.h> 13#include <linux/etherdevice.h> 14#include <net/arp.h> 15#include <net/cfg80211.h> 16#include <net/cfg80211-wext.h> 17#include <net/iw_handler.h> 18#include "core.h" 19#include "nl80211.h" 20#include "wext-compat.h" 21#include "rdev-ops.h" 22 23/** 24 * DOC: BSS tree/list structure 25 * 26 * At the top level, the BSS list is kept in both a list in each 27 * registered device (@bss_list) as well as an RB-tree for faster 28 * lookup. In the RB-tree, entries can be looked up using their 29 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID 30 * for other BSSes. 31 * 32 * Due to the possibility of hidden SSIDs, there's a second level 33 * structure, the "hidden_list" and "hidden_beacon_bss" pointer. 34 * The hidden_list connects all BSSes belonging to a single AP 35 * that has a hidden SSID, and connects beacon and probe response 36 * entries. For a probe response entry for a hidden SSID, the 37 * hidden_beacon_bss pointer points to the BSS struct holding the 38 * beacon's information. 39 * 40 * Reference counting is done for all these references except for 41 * the hidden_list, so that a beacon BSS struct that is otherwise 42 * not referenced has one reference for being on the bss_list and 43 * one for each probe response entry that points to it using the 44 * hidden_beacon_bss pointer. When a BSS struct that has such a 45 * pointer is get/put, the refcount update is also propagated to 46 * the referenced struct, this ensure that it cannot get removed 47 * while somebody is using the probe response version. 48 * 49 * Note that the hidden_beacon_bss pointer never changes, due to 50 * the reference counting. Therefore, no locking is needed for 51 * it. 52 * 53 * Also note that the hidden_beacon_bss pointer is only relevant 54 * if the driver uses something other than the IEs, e.g. private 55 * data stored stored in the BSS struct, since the beacon IEs are 56 * also linked into the probe response struct. 57 */ 58 59#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) 60 61static void bss_free(struct cfg80211_internal_bss *bss) 62{ 63 struct cfg80211_bss_ies *ies; 64 65 if (WARN_ON(atomic_read(&bss->hold))) 66 return; 67 68 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); 69 if (ies && !bss->pub.hidden_beacon_bss) 70 kfree_rcu(ies, rcu_head); 71 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); 72 if (ies) 73 kfree_rcu(ies, rcu_head); 74 75 /* 76 * This happens when the module is removed, it doesn't 77 * really matter any more save for completeness 78 */ 79 if (!list_empty(&bss->hidden_list)) 80 list_del(&bss->hidden_list); 81 82 kfree(bss); 83} 84 85static inline void bss_ref_get(struct cfg80211_registered_device *rdev, 86 struct cfg80211_internal_bss *bss) 87{ 88 lockdep_assert_held(&rdev->bss_lock); 89 90 bss->refcount++; 91 if (bss->pub.hidden_beacon_bss) { 92 bss = container_of(bss->pub.hidden_beacon_bss, 93 struct cfg80211_internal_bss, 94 pub); 95 bss->refcount++; 96 } 97} 98 99static inline void bss_ref_put(struct cfg80211_registered_device *rdev, 100 struct cfg80211_internal_bss *bss) 101{ 102 lockdep_assert_held(&rdev->bss_lock); 103 104 if (bss->pub.hidden_beacon_bss) { 105 struct cfg80211_internal_bss *hbss; 106 hbss = container_of(bss->pub.hidden_beacon_bss, 107 struct cfg80211_internal_bss, 108 pub); 109 hbss->refcount--; 110 if (hbss->refcount == 0) 111 bss_free(hbss); 112 } 113 bss->refcount--; 114 if (bss->refcount == 0) 115 bss_free(bss); 116} 117 118static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, 119 struct cfg80211_internal_bss *bss) 120{ 121 lockdep_assert_held(&rdev->bss_lock); 122 123 if (!list_empty(&bss->hidden_list)) { 124 /* 125 * don't remove the beacon entry if it has 126 * probe responses associated with it 127 */ 128 if (!bss->pub.hidden_beacon_bss) 129 return false; 130 /* 131 * if it's a probe response entry break its 132 * link to the other entries in the group 133 */ 134 list_del_init(&bss->hidden_list); 135 } 136 137 list_del_init(&bss->list); 138 rb_erase(&bss->rbn, &rdev->bss_tree); 139 bss_ref_put(rdev, bss); 140 return true; 141} 142 143static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, 144 unsigned long expire_time) 145{ 146 struct cfg80211_internal_bss *bss, *tmp; 147 bool expired = false; 148 149 lockdep_assert_held(&rdev->bss_lock); 150 151 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { 152 if (atomic_read(&bss->hold)) 153 continue; 154 if (!time_after(expire_time, bss->ts)) 155 continue; 156 157 if (__cfg80211_unlink_bss(rdev, bss)) 158 expired = true; 159 } 160 161 if (expired) 162 rdev->bss_generation++; 163} 164 165void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, 166 bool send_message) 167{ 168 struct cfg80211_scan_request *request; 169 struct wireless_dev *wdev; 170 struct sk_buff *msg; 171#ifdef CONFIG_CFG80211_WEXT 172 union iwreq_data wrqu; 173#endif 174 175 ASSERT_RTNL(); 176 177 if (rdev->scan_msg) { 178 nl80211_send_scan_result(rdev, rdev->scan_msg); 179 rdev->scan_msg = NULL; 180 return; 181 } 182 183 request = rdev->scan_req; 184 if (!request) 185 return; 186 187 wdev = request->wdev; 188 189 /* 190 * This must be before sending the other events! 191 * Otherwise, wpa_supplicant gets completely confused with 192 * wext events. 193 */ 194 if (wdev->netdev) 195 cfg80211_sme_scan_done(wdev->netdev); 196 197 if (!request->aborted && 198 request->flags & NL80211_SCAN_FLAG_FLUSH) { 199 /* flush entries from previous scans */ 200 spin_lock_bh(&rdev->bss_lock); 201 __cfg80211_bss_expire(rdev, request->scan_start); 202 spin_unlock_bh(&rdev->bss_lock); 203 } 204 205 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted); 206 207#ifdef CONFIG_CFG80211_WEXT 208 if (wdev->netdev && !request->aborted) { 209 memset(&wrqu, 0, sizeof(wrqu)); 210 211 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); 212 } 213#endif 214 215 if (wdev->netdev) 216 dev_put(wdev->netdev); 217 218 rdev->scan_req = NULL; 219 kfree(request); 220 221 if (!send_message) 222 rdev->scan_msg = msg; 223 else 224 nl80211_send_scan_result(rdev, msg); 225} 226 227void __cfg80211_scan_done(struct work_struct *wk) 228{ 229 struct cfg80211_registered_device *rdev; 230 231 rdev = container_of(wk, struct cfg80211_registered_device, 232 scan_done_wk); 233 234 rtnl_lock(); 235 ___cfg80211_scan_done(rdev, true); 236 rtnl_unlock(); 237} 238 239void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 240{ 241 trace_cfg80211_scan_done(request, aborted); 242 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); 243 244 request->aborted = aborted; 245 request->notified = true; 246 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); 247} 248EXPORT_SYMBOL(cfg80211_scan_done); 249 250void __cfg80211_sched_scan_results(struct work_struct *wk) 251{ 252 struct cfg80211_registered_device *rdev; 253 struct cfg80211_sched_scan_request *request; 254 255 rdev = container_of(wk, struct cfg80211_registered_device, 256 sched_scan_results_wk); 257 258 rtnl_lock(); 259 260 request = rtnl_dereference(rdev->sched_scan_req); 261 262 /* we don't have sched_scan_req anymore if the scan is stopping */ 263 if (request) { 264 if (request->flags & NL80211_SCAN_FLAG_FLUSH) { 265 /* flush entries from previous scans */ 266 spin_lock_bh(&rdev->bss_lock); 267 __cfg80211_bss_expire(rdev, request->scan_start); 268 spin_unlock_bh(&rdev->bss_lock); 269 request->scan_start = jiffies; 270 } 271 nl80211_send_sched_scan_results(rdev, request->dev); 272 } 273 274 rtnl_unlock(); 275} 276 277void cfg80211_sched_scan_results(struct wiphy *wiphy) 278{ 279 trace_cfg80211_sched_scan_results(wiphy); 280 /* ignore if we're not scanning */ 281 282 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req)) 283 queue_work(cfg80211_wq, 284 &wiphy_to_rdev(wiphy)->sched_scan_results_wk); 285} 286EXPORT_SYMBOL(cfg80211_sched_scan_results); 287 288void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) 289{ 290 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 291 292 ASSERT_RTNL(); 293 294 trace_cfg80211_sched_scan_stopped(wiphy); 295 296 __cfg80211_stop_sched_scan(rdev, true); 297} 298EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); 299 300void cfg80211_sched_scan_stopped(struct wiphy *wiphy) 301{ 302 rtnl_lock(); 303 cfg80211_sched_scan_stopped_rtnl(wiphy); 304 rtnl_unlock(); 305} 306EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 307 308int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 309 bool driver_initiated) 310{ 311 struct cfg80211_sched_scan_request *sched_scan_req; 312 struct net_device *dev; 313 314 ASSERT_RTNL(); 315 316 if (!rdev->sched_scan_req) 317 return -ENOENT; 318 319 sched_scan_req = rtnl_dereference(rdev->sched_scan_req); 320 dev = sched_scan_req->dev; 321 322 if (!driver_initiated) { 323 int err = rdev_sched_scan_stop(rdev, dev); 324 if (err) 325 return err; 326 } 327 328 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); 329 330 RCU_INIT_POINTER(rdev->sched_scan_req, NULL); 331 kfree_rcu(sched_scan_req, rcu_head); 332 333 return 0; 334} 335 336void cfg80211_bss_age(struct cfg80211_registered_device *rdev, 337 unsigned long age_secs) 338{ 339 struct cfg80211_internal_bss *bss; 340 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 341 342 spin_lock_bh(&rdev->bss_lock); 343 list_for_each_entry(bss, &rdev->bss_list, list) 344 bss->ts -= age_jiffies; 345 spin_unlock_bh(&rdev->bss_lock); 346} 347 348void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) 349{ 350 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 351} 352 353const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) 354{ 355 while (len > 2 && ies[0] != eid) { 356 len -= ies[1] + 2; 357 ies += ies[1] + 2; 358 } 359 if (len < 2) 360 return NULL; 361 if (len < 2 + ies[1]) 362 return NULL; 363 return ies; 364} 365EXPORT_SYMBOL(cfg80211_find_ie); 366 367const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, 368 const u8 *ies, int len) 369{ 370 struct ieee80211_vendor_ie *ie; 371 const u8 *pos = ies, *end = ies + len; 372 int ie_oui; 373 374 while (pos < end) { 375 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, 376 end - pos); 377 if (!pos) 378 return NULL; 379 380 ie = (struct ieee80211_vendor_ie *)pos; 381 382 /* make sure we can access ie->len */ 383 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); 384 385 if (ie->len < sizeof(*ie)) 386 goto cont; 387 388 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; 389 if (ie_oui == oui && ie->oui_type == oui_type) 390 return pos; 391cont: 392 pos += 2 + ie->len; 393 } 394 return NULL; 395} 396EXPORT_SYMBOL(cfg80211_find_vendor_ie); 397 398static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, 399 const u8 *ssid, size_t ssid_len) 400{ 401 const struct cfg80211_bss_ies *ies; 402 const u8 *ssidie; 403 404 if (bssid && !ether_addr_equal(a->bssid, bssid)) 405 return false; 406 407 if (!ssid) 408 return true; 409 410 ies = rcu_access_pointer(a->ies); 411 if (!ies) 412 return false; 413 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 414 if (!ssidie) 415 return false; 416 if (ssidie[1] != ssid_len) 417 return false; 418 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 419} 420 421/** 422 * enum bss_compare_mode - BSS compare mode 423 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) 424 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode 425 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode 426 */ 427enum bss_compare_mode { 428 BSS_CMP_REGULAR, 429 BSS_CMP_HIDE_ZLEN, 430 BSS_CMP_HIDE_NUL, 431}; 432 433static int cmp_bss(struct cfg80211_bss *a, 434 struct cfg80211_bss *b, 435 enum bss_compare_mode mode) 436{ 437 const struct cfg80211_bss_ies *a_ies, *b_ies; 438 const u8 *ie1 = NULL; 439 const u8 *ie2 = NULL; 440 int i, r; 441 442 if (a->channel != b->channel) 443 return b->channel->center_freq - a->channel->center_freq; 444 445 a_ies = rcu_access_pointer(a->ies); 446 if (!a_ies) 447 return -1; 448 b_ies = rcu_access_pointer(b->ies); 449 if (!b_ies) 450 return 1; 451 452 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 453 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, 454 a_ies->data, a_ies->len); 455 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) 456 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, 457 b_ies->data, b_ies->len); 458 if (ie1 && ie2) { 459 int mesh_id_cmp; 460 461 if (ie1[1] == ie2[1]) 462 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); 463 else 464 mesh_id_cmp = ie2[1] - ie1[1]; 465 466 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 467 a_ies->data, a_ies->len); 468 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 469 b_ies->data, b_ies->len); 470 if (ie1 && ie2) { 471 if (mesh_id_cmp) 472 return mesh_id_cmp; 473 if (ie1[1] != ie2[1]) 474 return ie2[1] - ie1[1]; 475 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 476 } 477 } 478 479 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 480 if (r) 481 return r; 482 483 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); 484 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); 485 486 if (!ie1 && !ie2) 487 return 0; 488 489 /* 490 * Note that with "hide_ssid", the function returns a match if 491 * the already-present BSS ("b") is a hidden SSID beacon for 492 * the new BSS ("a"). 493 */ 494 495 /* sort missing IE before (left of) present IE */ 496 if (!ie1) 497 return -1; 498 if (!ie2) 499 return 1; 500 501 switch (mode) { 502 case BSS_CMP_HIDE_ZLEN: 503 /* 504 * In ZLEN mode we assume the BSS entry we're 505 * looking for has a zero-length SSID. So if 506 * the one we're looking at right now has that, 507 * return 0. Otherwise, return the difference 508 * in length, but since we're looking for the 509 * 0-length it's really equivalent to returning 510 * the length of the one we're looking at. 511 * 512 * No content comparison is needed as we assume 513 * the content length is zero. 514 */ 515 return ie2[1]; 516 case BSS_CMP_REGULAR: 517 default: 518 /* sort by length first, then by contents */ 519 if (ie1[1] != ie2[1]) 520 return ie2[1] - ie1[1]; 521 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 522 case BSS_CMP_HIDE_NUL: 523 if (ie1[1] != ie2[1]) 524 return ie2[1] - ie1[1]; 525 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ 526 for (i = 0; i < ie2[1]; i++) 527 if (ie2[i + 2]) 528 return -1; 529 return 0; 530 } 531} 532 533static bool cfg80211_bss_type_match(u16 capability, 534 enum ieee80211_band band, 535 enum ieee80211_bss_type bss_type) 536{ 537 bool ret = true; 538 u16 mask, val; 539 540 if (bss_type == IEEE80211_BSS_TYPE_ANY) 541 return ret; 542 543 if (band == IEEE80211_BAND_60GHZ) { 544 mask = WLAN_CAPABILITY_DMG_TYPE_MASK; 545 switch (bss_type) { 546 case IEEE80211_BSS_TYPE_ESS: 547 val = WLAN_CAPABILITY_DMG_TYPE_AP; 548 break; 549 case IEEE80211_BSS_TYPE_PBSS: 550 val = WLAN_CAPABILITY_DMG_TYPE_PBSS; 551 break; 552 case IEEE80211_BSS_TYPE_IBSS: 553 val = WLAN_CAPABILITY_DMG_TYPE_IBSS; 554 break; 555 default: 556 return false; 557 } 558 } else { 559 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; 560 switch (bss_type) { 561 case IEEE80211_BSS_TYPE_ESS: 562 val = WLAN_CAPABILITY_ESS; 563 break; 564 case IEEE80211_BSS_TYPE_IBSS: 565 val = WLAN_CAPABILITY_IBSS; 566 break; 567 case IEEE80211_BSS_TYPE_MBSS: 568 val = 0; 569 break; 570 default: 571 return false; 572 } 573 } 574 575 ret = ((capability & mask) == val); 576 return ret; 577} 578 579/* Returned bss is reference counted and must be cleaned up appropriately. */ 580struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 581 struct ieee80211_channel *channel, 582 const u8 *bssid, 583 const u8 *ssid, size_t ssid_len, 584 enum ieee80211_bss_type bss_type, 585 enum ieee80211_privacy privacy) 586{ 587 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 588 struct cfg80211_internal_bss *bss, *res = NULL; 589 unsigned long now = jiffies; 590 int bss_privacy; 591 592 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, 593 privacy); 594 595 spin_lock_bh(&rdev->bss_lock); 596 597 list_for_each_entry(bss, &rdev->bss_list, list) { 598 if (!cfg80211_bss_type_match(bss->pub.capability, 599 bss->pub.channel->band, bss_type)) 600 continue; 601 602 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); 603 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || 604 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) 605 continue; 606 if (channel && bss->pub.channel != channel) 607 continue; 608 if (!is_valid_ether_addr(bss->pub.bssid)) 609 continue; 610 /* Don't get expired BSS structs */ 611 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 612 !atomic_read(&bss->hold)) 613 continue; 614 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 615 res = bss; 616 bss_ref_get(rdev, res); 617 break; 618 } 619 } 620 621 spin_unlock_bh(&rdev->bss_lock); 622 if (!res) 623 return NULL; 624 trace_cfg80211_return_bss(&res->pub); 625 return &res->pub; 626} 627EXPORT_SYMBOL(cfg80211_get_bss); 628 629static void rb_insert_bss(struct cfg80211_registered_device *rdev, 630 struct cfg80211_internal_bss *bss) 631{ 632 struct rb_node **p = &rdev->bss_tree.rb_node; 633 struct rb_node *parent = NULL; 634 struct cfg80211_internal_bss *tbss; 635 int cmp; 636 637 while (*p) { 638 parent = *p; 639 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 640 641 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); 642 643 if (WARN_ON(!cmp)) { 644 /* will sort of leak this BSS */ 645 return; 646 } 647 648 if (cmp < 0) 649 p = &(*p)->rb_left; 650 else 651 p = &(*p)->rb_right; 652 } 653 654 rb_link_node(&bss->rbn, parent, p); 655 rb_insert_color(&bss->rbn, &rdev->bss_tree); 656} 657 658static struct cfg80211_internal_bss * 659rb_find_bss(struct cfg80211_registered_device *rdev, 660 struct cfg80211_internal_bss *res, 661 enum bss_compare_mode mode) 662{ 663 struct rb_node *n = rdev->bss_tree.rb_node; 664 struct cfg80211_internal_bss *bss; 665 int r; 666 667 while (n) { 668 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 669 r = cmp_bss(&res->pub, &bss->pub, mode); 670 671 if (r == 0) 672 return bss; 673 else if (r < 0) 674 n = n->rb_left; 675 else 676 n = n->rb_right; 677 } 678 679 return NULL; 680} 681 682static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, 683 struct cfg80211_internal_bss *new) 684{ 685 const struct cfg80211_bss_ies *ies; 686 struct cfg80211_internal_bss *bss; 687 const u8 *ie; 688 int i, ssidlen; 689 u8 fold = 0; 690 691 ies = rcu_access_pointer(new->pub.beacon_ies); 692 if (WARN_ON(!ies)) 693 return false; 694 695 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 696 if (!ie) { 697 /* nothing to do */ 698 return true; 699 } 700 701 ssidlen = ie[1]; 702 for (i = 0; i < ssidlen; i++) 703 fold |= ie[2 + i]; 704 705 if (fold) { 706 /* not a hidden SSID */ 707 return true; 708 } 709 710 /* This is the bad part ... */ 711 712 list_for_each_entry(bss, &rdev->bss_list, list) { 713 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) 714 continue; 715 if (bss->pub.channel != new->pub.channel) 716 continue; 717 if (bss->pub.scan_width != new->pub.scan_width) 718 continue; 719 if (rcu_access_pointer(bss->pub.beacon_ies)) 720 continue; 721 ies = rcu_access_pointer(bss->pub.ies); 722 if (!ies) 723 continue; 724 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 725 if (!ie) 726 continue; 727 if (ssidlen && ie[1] != ssidlen) 728 continue; 729 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 730 continue; 731 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 732 list_del(&bss->hidden_list); 733 /* combine them */ 734 list_add(&bss->hidden_list, &new->hidden_list); 735 bss->pub.hidden_beacon_bss = &new->pub; 736 new->refcount += bss->refcount; 737 rcu_assign_pointer(bss->pub.beacon_ies, 738 new->pub.beacon_ies); 739 } 740 741 return true; 742} 743 744/* Returned bss is reference counted and must be cleaned up appropriately. */ 745static struct cfg80211_internal_bss * 746cfg80211_bss_update(struct cfg80211_registered_device *rdev, 747 struct cfg80211_internal_bss *tmp, 748 bool signal_valid) 749{ 750 struct cfg80211_internal_bss *found = NULL; 751 752 if (WARN_ON(!tmp->pub.channel)) 753 return NULL; 754 755 tmp->ts = jiffies; 756 757 spin_lock_bh(&rdev->bss_lock); 758 759 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { 760 spin_unlock_bh(&rdev->bss_lock); 761 return NULL; 762 } 763 764 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); 765 766 if (found) { 767 /* Update IEs */ 768 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 769 const struct cfg80211_bss_ies *old; 770 771 old = rcu_access_pointer(found->pub.proberesp_ies); 772 773 rcu_assign_pointer(found->pub.proberesp_ies, 774 tmp->pub.proberesp_ies); 775 /* Override possible earlier Beacon frame IEs */ 776 rcu_assign_pointer(found->pub.ies, 777 tmp->pub.proberesp_ies); 778 if (old) 779 kfree_rcu((struct cfg80211_bss_ies *)old, 780 rcu_head); 781 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { 782 const struct cfg80211_bss_ies *old; 783 struct cfg80211_internal_bss *bss; 784 785 if (found->pub.hidden_beacon_bss && 786 !list_empty(&found->hidden_list)) { 787 const struct cfg80211_bss_ies *f; 788 789 /* 790 * The found BSS struct is one of the probe 791 * response members of a group, but we're 792 * receiving a beacon (beacon_ies in the tmp 793 * bss is used). This can only mean that the 794 * AP changed its beacon from not having an 795 * SSID to showing it, which is confusing so 796 * drop this information. 797 */ 798 799 f = rcu_access_pointer(tmp->pub.beacon_ies); 800 kfree_rcu((struct cfg80211_bss_ies *)f, 801 rcu_head); 802 goto drop; 803 } 804 805 old = rcu_access_pointer(found->pub.beacon_ies); 806 807 rcu_assign_pointer(found->pub.beacon_ies, 808 tmp->pub.beacon_ies); 809 810 /* Override IEs if they were from a beacon before */ 811 if (old == rcu_access_pointer(found->pub.ies)) 812 rcu_assign_pointer(found->pub.ies, 813 tmp->pub.beacon_ies); 814 815 /* Assign beacon IEs to all sub entries */ 816 list_for_each_entry(bss, &found->hidden_list, 817 hidden_list) { 818 const struct cfg80211_bss_ies *ies; 819 820 ies = rcu_access_pointer(bss->pub.beacon_ies); 821 WARN_ON(ies != old); 822 823 rcu_assign_pointer(bss->pub.beacon_ies, 824 tmp->pub.beacon_ies); 825 } 826 827 if (old) 828 kfree_rcu((struct cfg80211_bss_ies *)old, 829 rcu_head); 830 } 831 832 found->pub.beacon_interval = tmp->pub.beacon_interval; 833 /* 834 * don't update the signal if beacon was heard on 835 * adjacent channel. 836 */ 837 if (signal_valid) 838 found->pub.signal = tmp->pub.signal; 839 found->pub.capability = tmp->pub.capability; 840 found->ts = tmp->ts; 841 found->ts_boottime = tmp->ts_boottime; 842 } else { 843 struct cfg80211_internal_bss *new; 844 struct cfg80211_internal_bss *hidden; 845 struct cfg80211_bss_ies *ies; 846 847 /* 848 * create a copy -- the "res" variable that is passed in 849 * is allocated on the stack since it's not needed in the 850 * more common case of an update 851 */ 852 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, 853 GFP_ATOMIC); 854 if (!new) { 855 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 856 if (ies) 857 kfree_rcu(ies, rcu_head); 858 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 859 if (ies) 860 kfree_rcu(ies, rcu_head); 861 goto drop; 862 } 863 memcpy(new, tmp, sizeof(*new)); 864 new->refcount = 1; 865 INIT_LIST_HEAD(&new->hidden_list); 866 867 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 868 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); 869 if (!hidden) 870 hidden = rb_find_bss(rdev, tmp, 871 BSS_CMP_HIDE_NUL); 872 if (hidden) { 873 new->pub.hidden_beacon_bss = &hidden->pub; 874 list_add(&new->hidden_list, 875 &hidden->hidden_list); 876 hidden->refcount++; 877 rcu_assign_pointer(new->pub.beacon_ies, 878 hidden->pub.beacon_ies); 879 } 880 } else { 881 /* 882 * Ok so we found a beacon, and don't have an entry. If 883 * it's a beacon with hidden SSID, we might be in for an 884 * expensive search for any probe responses that should 885 * be grouped with this beacon for updates ... 886 */ 887 if (!cfg80211_combine_bsses(rdev, new)) { 888 kfree(new); 889 goto drop; 890 } 891 } 892 893 list_add_tail(&new->list, &rdev->bss_list); 894 rb_insert_bss(rdev, new); 895 found = new; 896 } 897 898 rdev->bss_generation++; 899 bss_ref_get(rdev, found); 900 spin_unlock_bh(&rdev->bss_lock); 901 902 return found; 903 drop: 904 spin_unlock_bh(&rdev->bss_lock); 905 return NULL; 906} 907 908static struct ieee80211_channel * 909cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 910 struct ieee80211_channel *channel) 911{ 912 const u8 *tmp; 913 u32 freq; 914 int channel_number = -1; 915 916 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); 917 if (tmp && tmp[1] == 1) { 918 channel_number = tmp[2]; 919 } else { 920 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); 921 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { 922 struct ieee80211_ht_operation *htop = (void *)(tmp + 2); 923 924 channel_number = htop->primary_chan; 925 } 926 } 927 928 if (channel_number < 0) 929 return channel; 930 931 freq = ieee80211_channel_to_frequency(channel_number, channel->band); 932 channel = ieee80211_get_channel(wiphy, freq); 933 if (!channel) 934 return NULL; 935 if (channel->flags & IEEE80211_CHAN_DISABLED) 936 return NULL; 937 return channel; 938} 939 940/* Returned bss is reference counted and must be cleaned up appropriately. */ 941struct cfg80211_bss * 942cfg80211_inform_bss_data(struct wiphy *wiphy, 943 struct cfg80211_inform_bss *data, 944 enum cfg80211_bss_frame_type ftype, 945 const u8 *bssid, u64 tsf, u16 capability, 946 u16 beacon_interval, const u8 *ie, size_t ielen, 947 gfp_t gfp) 948{ 949 struct cfg80211_bss_ies *ies; 950 struct ieee80211_channel *channel; 951 struct cfg80211_internal_bss tmp = {}, *res; 952 int bss_type; 953 bool signal_valid; 954 955 if (WARN_ON(!wiphy)) 956 return NULL; 957 958 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 959 (data->signal < 0 || data->signal > 100))) 960 return NULL; 961 962 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); 963 if (!channel) 964 return NULL; 965 966 memcpy(tmp.pub.bssid, bssid, ETH_ALEN); 967 tmp.pub.channel = channel; 968 tmp.pub.scan_width = data->scan_width; 969 tmp.pub.signal = data->signal; 970 tmp.pub.beacon_interval = beacon_interval; 971 tmp.pub.capability = capability; 972 tmp.ts_boottime = data->boottime_ns; 973 974 /* 975 * If we do not know here whether the IEs are from a Beacon or Probe 976 * Response frame, we need to pick one of the options and only use it 977 * with the driver that does not provide the full Beacon/Probe Response 978 * frame. Use Beacon frame pointer to avoid indicating that this should 979 * override the IEs pointer should we have received an earlier 980 * indication of Probe Response data. 981 */ 982 ies = kzalloc(sizeof(*ies) + ielen, gfp); 983 if (!ies) 984 return NULL; 985 ies->len = ielen; 986 ies->tsf = tsf; 987 ies->from_beacon = false; 988 memcpy(ies->data, ie, ielen); 989 990 switch (ftype) { 991 case CFG80211_BSS_FTYPE_BEACON: 992 ies->from_beacon = true; 993 /* fall through to assign */ 994 case CFG80211_BSS_FTYPE_UNKNOWN: 995 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 996 break; 997 case CFG80211_BSS_FTYPE_PRESP: 998 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 999 break; 1000 } 1001 rcu_assign_pointer(tmp.pub.ies, ies); 1002 1003 signal_valid = abs(data->chan->center_freq - channel->center_freq) <= 1004 wiphy->max_adj_channel_rssi_comp; 1005 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); 1006 if (!res) 1007 return NULL; 1008 1009 if (channel->band == IEEE80211_BAND_60GHZ) { 1010 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; 1011 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || 1012 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) 1013 regulatory_hint_found_beacon(wiphy, channel, gfp); 1014 } else { 1015 if (res->pub.capability & WLAN_CAPABILITY_ESS) 1016 regulatory_hint_found_beacon(wiphy, channel, gfp); 1017 } 1018 1019 trace_cfg80211_return_bss(&res->pub); 1020 /* cfg80211_bss_update gives us a referenced result */ 1021 return &res->pub; 1022} 1023EXPORT_SYMBOL(cfg80211_inform_bss_data); 1024 1025/* cfg80211_inform_bss_width_frame helper */ 1026struct cfg80211_bss * 1027cfg80211_inform_bss_frame_data(struct wiphy *wiphy, 1028 struct cfg80211_inform_bss *data, 1029 struct ieee80211_mgmt *mgmt, size_t len, 1030 gfp_t gfp) 1031 1032{ 1033 struct cfg80211_internal_bss tmp = {}, *res; 1034 struct cfg80211_bss_ies *ies; 1035 struct ieee80211_channel *channel; 1036 bool signal_valid; 1037 size_t ielen = len - offsetof(struct ieee80211_mgmt, 1038 u.probe_resp.variable); 1039 int bss_type; 1040 1041 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 1042 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 1043 1044 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); 1045 1046 if (WARN_ON(!mgmt)) 1047 return NULL; 1048 1049 if (WARN_ON(!wiphy)) 1050 return NULL; 1051 1052 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 1053 (data->signal < 0 || data->signal > 100))) 1054 return NULL; 1055 1056 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 1057 return NULL; 1058 1059 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, 1060 ielen, data->chan); 1061 if (!channel) 1062 return NULL; 1063 1064 ies = kzalloc(sizeof(*ies) + ielen, gfp); 1065 if (!ies) 1066 return NULL; 1067 ies->len = ielen; 1068 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 1069 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); 1070 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); 1071 1072 if (ieee80211_is_probe_resp(mgmt->frame_control)) 1073 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 1074 else 1075 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 1076 rcu_assign_pointer(tmp.pub.ies, ies); 1077 1078 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); 1079 tmp.pub.channel = channel; 1080 tmp.pub.scan_width = data->scan_width; 1081 tmp.pub.signal = data->signal; 1082 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 1083 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 1084 tmp.ts_boottime = data->boottime_ns; 1085 1086 signal_valid = abs(data->chan->center_freq - channel->center_freq) <= 1087 wiphy->max_adj_channel_rssi_comp; 1088 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); 1089 if (!res) 1090 return NULL; 1091 1092 if (channel->band == IEEE80211_BAND_60GHZ) { 1093 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; 1094 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || 1095 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) 1096 regulatory_hint_found_beacon(wiphy, channel, gfp); 1097 } else { 1098 if (res->pub.capability & WLAN_CAPABILITY_ESS) 1099 regulatory_hint_found_beacon(wiphy, channel, gfp); 1100 } 1101 1102 trace_cfg80211_return_bss(&res->pub); 1103 /* cfg80211_bss_update gives us a referenced result */ 1104 return &res->pub; 1105} 1106EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); 1107 1108void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1109{ 1110 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1111 struct cfg80211_internal_bss *bss; 1112 1113 if (!pub) 1114 return; 1115 1116 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1117 1118 spin_lock_bh(&rdev->bss_lock); 1119 bss_ref_get(rdev, bss); 1120 spin_unlock_bh(&rdev->bss_lock); 1121} 1122EXPORT_SYMBOL(cfg80211_ref_bss); 1123 1124void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1125{ 1126 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1127 struct cfg80211_internal_bss *bss; 1128 1129 if (!pub) 1130 return; 1131 1132 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1133 1134 spin_lock_bh(&rdev->bss_lock); 1135 bss_ref_put(rdev, bss); 1136 spin_unlock_bh(&rdev->bss_lock); 1137} 1138EXPORT_SYMBOL(cfg80211_put_bss); 1139 1140void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1141{ 1142 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1143 struct cfg80211_internal_bss *bss; 1144 1145 if (WARN_ON(!pub)) 1146 return; 1147 1148 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1149 1150 spin_lock_bh(&rdev->bss_lock); 1151 if (!list_empty(&bss->list)) { 1152 if (__cfg80211_unlink_bss(rdev, bss)) 1153 rdev->bss_generation++; 1154 } 1155 spin_unlock_bh(&rdev->bss_lock); 1156} 1157EXPORT_SYMBOL(cfg80211_unlink_bss); 1158 1159#ifdef CONFIG_CFG80211_WEXT 1160static struct cfg80211_registered_device * 1161cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 1162{ 1163 struct cfg80211_registered_device *rdev; 1164 struct net_device *dev; 1165 1166 ASSERT_RTNL(); 1167 1168 dev = dev_get_by_index(net, ifindex); 1169 if (!dev) 1170 return ERR_PTR(-ENODEV); 1171 if (dev->ieee80211_ptr) 1172 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); 1173 else 1174 rdev = ERR_PTR(-ENODEV); 1175 dev_put(dev); 1176 return rdev; 1177} 1178 1179int cfg80211_wext_siwscan(struct net_device *dev, 1180 struct iw_request_info *info, 1181 union iwreq_data *wrqu, char *extra) 1182{ 1183 struct cfg80211_registered_device *rdev; 1184 struct wiphy *wiphy; 1185 struct iw_scan_req *wreq = NULL; 1186 struct cfg80211_scan_request *creq = NULL; 1187 int i, err, n_channels = 0; 1188 enum ieee80211_band band; 1189 1190 if (!netif_running(dev)) 1191 return -ENETDOWN; 1192 1193 if (wrqu->data.length == sizeof(struct iw_scan_req)) 1194 wreq = (struct iw_scan_req *)extra; 1195 1196 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1197 1198 if (IS_ERR(rdev)) 1199 return PTR_ERR(rdev); 1200 1201 if (rdev->scan_req || rdev->scan_msg) { 1202 err = -EBUSY; 1203 goto out; 1204 } 1205 1206 wiphy = &rdev->wiphy; 1207 1208 /* Determine number of channels, needed to allocate creq */ 1209 if (wreq && wreq->num_channels) 1210 n_channels = wreq->num_channels; 1211 else 1212 n_channels = ieee80211_get_num_supported_channels(wiphy); 1213 1214 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 1215 n_channels * sizeof(void *), 1216 GFP_ATOMIC); 1217 if (!creq) { 1218 err = -ENOMEM; 1219 goto out; 1220 } 1221 1222 creq->wiphy = wiphy; 1223 creq->wdev = dev->ieee80211_ptr; 1224 /* SSIDs come after channels */ 1225 creq->ssids = (void *)&creq->channels[n_channels]; 1226 creq->n_channels = n_channels; 1227 creq->n_ssids = 1; 1228 creq->scan_start = jiffies; 1229 1230 /* translate "Scan on frequencies" request */ 1231 i = 0; 1232 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1233 int j; 1234 1235 if (!wiphy->bands[band]) 1236 continue; 1237 1238 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 1239 /* ignore disabled channels */ 1240 if (wiphy->bands[band]->channels[j].flags & 1241 IEEE80211_CHAN_DISABLED) 1242 continue; 1243 1244 /* If we have a wireless request structure and the 1245 * wireless request specifies frequencies, then search 1246 * for the matching hardware channel. 1247 */ 1248 if (wreq && wreq->num_channels) { 1249 int k; 1250 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 1251 for (k = 0; k < wreq->num_channels; k++) { 1252 struct iw_freq *freq = 1253 &wreq->channel_list[k]; 1254 int wext_freq = 1255 cfg80211_wext_freq(freq); 1256 1257 if (wext_freq == wiphy_freq) 1258 goto wext_freq_found; 1259 } 1260 goto wext_freq_not_found; 1261 } 1262 1263 wext_freq_found: 1264 creq->channels[i] = &wiphy->bands[band]->channels[j]; 1265 i++; 1266 wext_freq_not_found: ; 1267 } 1268 } 1269 /* No channels found? */ 1270 if (!i) { 1271 err = -EINVAL; 1272 goto out; 1273 } 1274 1275 /* Set real number of channels specified in creq->channels[] */ 1276 creq->n_channels = i; 1277 1278 /* translate "Scan for SSID" request */ 1279 if (wreq) { 1280 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1281 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1282 err = -EINVAL; 1283 goto out; 1284 } 1285 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1286 creq->ssids[0].ssid_len = wreq->essid_len; 1287 } 1288 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1289 creq->n_ssids = 0; 1290 } 1291 1292 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1293 if (wiphy->bands[i]) 1294 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1295 1296 rdev->scan_req = creq; 1297 err = rdev_scan(rdev, creq); 1298 if (err) { 1299 rdev->scan_req = NULL; 1300 /* creq will be freed below */ 1301 } else { 1302 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 1303 /* creq now owned by driver */ 1304 creq = NULL; 1305 dev_hold(dev); 1306 } 1307 out: 1308 kfree(creq); 1309 return err; 1310} 1311EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); 1312 1313static char *ieee80211_scan_add_ies(struct iw_request_info *info, 1314 const struct cfg80211_bss_ies *ies, 1315 char *current_ev, char *end_buf) 1316{ 1317 const u8 *pos, *end, *next; 1318 struct iw_event iwe; 1319 1320 if (!ies) 1321 return current_ev; 1322 1323 /* 1324 * If needed, fragment the IEs buffer (at IE boundaries) into short 1325 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1326 */ 1327 pos = ies->data; 1328 end = pos + ies->len; 1329 1330 while (end - pos > IW_GENERIC_IE_MAX) { 1331 next = pos + 2 + pos[1]; 1332 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1333 next = next + 2 + next[1]; 1334 1335 memset(&iwe, 0, sizeof(iwe)); 1336 iwe.cmd = IWEVGENIE; 1337 iwe.u.data.length = next - pos; 1338 current_ev = iwe_stream_add_point_check(info, current_ev, 1339 end_buf, &iwe, 1340 (void *)pos); 1341 if (IS_ERR(current_ev)) 1342 return current_ev; 1343 pos = next; 1344 } 1345 1346 if (end > pos) { 1347 memset(&iwe, 0, sizeof(iwe)); 1348 iwe.cmd = IWEVGENIE; 1349 iwe.u.data.length = end - pos; 1350 current_ev = iwe_stream_add_point_check(info, current_ev, 1351 end_buf, &iwe, 1352 (void *)pos); 1353 if (IS_ERR(current_ev)) 1354 return current_ev; 1355 } 1356 1357 return current_ev; 1358} 1359 1360static char * 1361ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1362 struct cfg80211_internal_bss *bss, char *current_ev, 1363 char *end_buf) 1364{ 1365 const struct cfg80211_bss_ies *ies; 1366 struct iw_event iwe; 1367 const u8 *ie; 1368 u8 buf[50]; 1369 u8 *cfg, *p, *tmp; 1370 int rem, i, sig; 1371 bool ismesh = false; 1372 1373 memset(&iwe, 0, sizeof(iwe)); 1374 iwe.cmd = SIOCGIWAP; 1375 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1376 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1377 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 1378 IW_EV_ADDR_LEN); 1379 if (IS_ERR(current_ev)) 1380 return current_ev; 1381 1382 memset(&iwe, 0, sizeof(iwe)); 1383 iwe.cmd = SIOCGIWFREQ; 1384 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1385 iwe.u.freq.e = 0; 1386 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 1387 IW_EV_FREQ_LEN); 1388 if (IS_ERR(current_ev)) 1389 return current_ev; 1390 1391 memset(&iwe, 0, sizeof(iwe)); 1392 iwe.cmd = SIOCGIWFREQ; 1393 iwe.u.freq.m = bss->pub.channel->center_freq; 1394 iwe.u.freq.e = 6; 1395 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 1396 IW_EV_FREQ_LEN); 1397 if (IS_ERR(current_ev)) 1398 return current_ev; 1399 1400 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1401 memset(&iwe, 0, sizeof(iwe)); 1402 iwe.cmd = IWEVQUAL; 1403 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1404 IW_QUAL_NOISE_INVALID | 1405 IW_QUAL_QUAL_UPDATED; 1406 switch (wiphy->signal_type) { 1407 case CFG80211_SIGNAL_TYPE_MBM: 1408 sig = bss->pub.signal / 100; 1409 iwe.u.qual.level = sig; 1410 iwe.u.qual.updated |= IW_QUAL_DBM; 1411 if (sig < -110) /* rather bad */ 1412 sig = -110; 1413 else if (sig > -40) /* perfect */ 1414 sig = -40; 1415 /* will give a range of 0 .. 70 */ 1416 iwe.u.qual.qual = sig + 110; 1417 break; 1418 case CFG80211_SIGNAL_TYPE_UNSPEC: 1419 iwe.u.qual.level = bss->pub.signal; 1420 /* will give range 0 .. 100 */ 1421 iwe.u.qual.qual = bss->pub.signal; 1422 break; 1423 default: 1424 /* not reached */ 1425 break; 1426 } 1427 current_ev = iwe_stream_add_event_check(info, current_ev, 1428 end_buf, &iwe, 1429 IW_EV_QUAL_LEN); 1430 if (IS_ERR(current_ev)) 1431 return current_ev; 1432 } 1433 1434 memset(&iwe, 0, sizeof(iwe)); 1435 iwe.cmd = SIOCGIWENCODE; 1436 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1437 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1438 else 1439 iwe.u.data.flags = IW_ENCODE_DISABLED; 1440 iwe.u.data.length = 0; 1441 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 1442 &iwe, ""); 1443 if (IS_ERR(current_ev)) 1444 return current_ev; 1445 1446 rcu_read_lock(); 1447 ies = rcu_dereference(bss->pub.ies); 1448 rem = ies->len; 1449 ie = ies->data; 1450 1451 while (rem >= 2) { 1452 /* invalid data */ 1453 if (ie[1] > rem - 2) 1454 break; 1455 1456 switch (ie[0]) { 1457 case WLAN_EID_SSID: 1458 memset(&iwe, 0, sizeof(iwe)); 1459 iwe.cmd = SIOCGIWESSID; 1460 iwe.u.data.length = ie[1]; 1461 iwe.u.data.flags = 1; 1462 current_ev = iwe_stream_add_point_check(info, 1463 current_ev, 1464 end_buf, &iwe, 1465 (u8 *)ie + 2); 1466 if (IS_ERR(current_ev)) 1467 goto unlock; 1468 break; 1469 case WLAN_EID_MESH_ID: 1470 memset(&iwe, 0, sizeof(iwe)); 1471 iwe.cmd = SIOCGIWESSID; 1472 iwe.u.data.length = ie[1]; 1473 iwe.u.data.flags = 1; 1474 current_ev = iwe_stream_add_point_check(info, 1475 current_ev, 1476 end_buf, &iwe, 1477 (u8 *)ie + 2); 1478 if (IS_ERR(current_ev)) 1479 goto unlock; 1480 break; 1481 case WLAN_EID_MESH_CONFIG: 1482 ismesh = true; 1483 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1484 break; 1485 cfg = (u8 *)ie + 2; 1486 memset(&iwe, 0, sizeof(iwe)); 1487 iwe.cmd = IWEVCUSTOM; 1488 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1489 "0x%02X", cfg[0]); 1490 iwe.u.data.length = strlen(buf); 1491 current_ev = iwe_stream_add_point_check(info, 1492 current_ev, 1493 end_buf, 1494 &iwe, buf); 1495 if (IS_ERR(current_ev)) 1496 goto unlock; 1497 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1498 cfg[1]); 1499 iwe.u.data.length = strlen(buf); 1500 current_ev = iwe_stream_add_point_check(info, 1501 current_ev, 1502 end_buf, 1503 &iwe, buf); 1504 if (IS_ERR(current_ev)) 1505 goto unlock; 1506 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1507 cfg[2]); 1508 iwe.u.data.length = strlen(buf); 1509 current_ev = iwe_stream_add_point_check(info, 1510 current_ev, 1511 end_buf, 1512 &iwe, buf); 1513 if (IS_ERR(current_ev)) 1514 goto unlock; 1515 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1516 iwe.u.data.length = strlen(buf); 1517 current_ev = iwe_stream_add_point_check(info, 1518 current_ev, 1519 end_buf, 1520 &iwe, buf); 1521 if (IS_ERR(current_ev)) 1522 goto unlock; 1523 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1524 iwe.u.data.length = strlen(buf); 1525 current_ev = iwe_stream_add_point_check(info, 1526 current_ev, 1527 end_buf, 1528 &iwe, buf); 1529 if (IS_ERR(current_ev)) 1530 goto unlock; 1531 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1532 iwe.u.data.length = strlen(buf); 1533 current_ev = iwe_stream_add_point_check(info, 1534 current_ev, 1535 end_buf, 1536 &iwe, buf); 1537 if (IS_ERR(current_ev)) 1538 goto unlock; 1539 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1540 iwe.u.data.length = strlen(buf); 1541 current_ev = iwe_stream_add_point_check(info, 1542 current_ev, 1543 end_buf, 1544 &iwe, buf); 1545 if (IS_ERR(current_ev)) 1546 goto unlock; 1547 break; 1548 case WLAN_EID_SUPP_RATES: 1549 case WLAN_EID_EXT_SUPP_RATES: 1550 /* display all supported rates in readable format */ 1551 p = current_ev + iwe_stream_lcp_len(info); 1552 1553 memset(&iwe, 0, sizeof(iwe)); 1554 iwe.cmd = SIOCGIWRATE; 1555 /* Those two flags are ignored... */ 1556 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1557 1558 for (i = 0; i < ie[1]; i++) { 1559 iwe.u.bitrate.value = 1560 ((ie[i + 2] & 0x7f) * 500000); 1561 tmp = p; 1562 p = iwe_stream_add_value(info, current_ev, p, 1563 end_buf, &iwe, 1564 IW_EV_PARAM_LEN); 1565 if (p == tmp) { 1566 current_ev = ERR_PTR(-E2BIG); 1567 goto unlock; 1568 } 1569 } 1570 current_ev = p; 1571 break; 1572 } 1573 rem -= ie[1] + 2; 1574 ie += ie[1] + 2; 1575 } 1576 1577 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1578 ismesh) { 1579 memset(&iwe, 0, sizeof(iwe)); 1580 iwe.cmd = SIOCGIWMODE; 1581 if (ismesh) 1582 iwe.u.mode = IW_MODE_MESH; 1583 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1584 iwe.u.mode = IW_MODE_MASTER; 1585 else 1586 iwe.u.mode = IW_MODE_ADHOC; 1587 current_ev = iwe_stream_add_event_check(info, current_ev, 1588 end_buf, &iwe, 1589 IW_EV_UINT_LEN); 1590 if (IS_ERR(current_ev)) 1591 goto unlock; 1592 } 1593 1594 memset(&iwe, 0, sizeof(iwe)); 1595 iwe.cmd = IWEVCUSTOM; 1596 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); 1597 iwe.u.data.length = strlen(buf); 1598 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 1599 &iwe, buf); 1600 if (IS_ERR(current_ev)) 1601 goto unlock; 1602 memset(&iwe, 0, sizeof(iwe)); 1603 iwe.cmd = IWEVCUSTOM; 1604 sprintf(buf, " Last beacon: %ums ago", 1605 elapsed_jiffies_msecs(bss->ts)); 1606 iwe.u.data.length = strlen(buf); 1607 current_ev = iwe_stream_add_point_check(info, current_ev, 1608 end_buf, &iwe, buf); 1609 if (IS_ERR(current_ev)) 1610 goto unlock; 1611 1612 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); 1613 1614 unlock: 1615 rcu_read_unlock(); 1616 return current_ev; 1617} 1618 1619 1620static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, 1621 struct iw_request_info *info, 1622 char *buf, size_t len) 1623{ 1624 char *current_ev = buf; 1625 char *end_buf = buf + len; 1626 struct cfg80211_internal_bss *bss; 1627 int err = 0; 1628 1629 spin_lock_bh(&rdev->bss_lock); 1630 cfg80211_bss_expire(rdev); 1631 1632 list_for_each_entry(bss, &rdev->bss_list, list) { 1633 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1634 err = -E2BIG; 1635 break; 1636 } 1637 current_ev = ieee80211_bss(&rdev->wiphy, info, bss, 1638 current_ev, end_buf); 1639 if (IS_ERR(current_ev)) { 1640 err = PTR_ERR(current_ev); 1641 break; 1642 } 1643 } 1644 spin_unlock_bh(&rdev->bss_lock); 1645 1646 if (err) 1647 return err; 1648 return current_ev - buf; 1649} 1650 1651 1652int cfg80211_wext_giwscan(struct net_device *dev, 1653 struct iw_request_info *info, 1654 struct iw_point *data, char *extra) 1655{ 1656 struct cfg80211_registered_device *rdev; 1657 int res; 1658 1659 if (!netif_running(dev)) 1660 return -ENETDOWN; 1661 1662 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1663 1664 if (IS_ERR(rdev)) 1665 return PTR_ERR(rdev); 1666 1667 if (rdev->scan_req || rdev->scan_msg) 1668 return -EAGAIN; 1669 1670 res = ieee80211_scan_results(rdev, info, extra, data->length); 1671 data->length = 0; 1672 if (res >= 0) { 1673 data->length = res; 1674 res = 0; 1675 } 1676 1677 return res; 1678} 1679EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); 1680#endif 1681