scan.c revision c14a74007f3712413140b5d06d4f7691234a8d3b
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#include "rdev-ops.h" 21 22/** 23 * DOC: BSS tree/list structure 24 * 25 * At the top level, the BSS list is kept in both a list in each 26 * registered device (@bss_list) as well as an RB-tree for faster 27 * lookup. In the RB-tree, entries can be looked up using their 28 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID 29 * for other BSSes. 30 * 31 * Due to the possibility of hidden SSIDs, there's a second level 32 * structure, the "hidden_list" and "hidden_beacon_bss" pointer. 33 * The hidden_list connects all BSSes belonging to a single AP 34 * that has a hidden SSID, and connects beacon and probe response 35 * entries. For a probe response entry for a hidden SSID, the 36 * hidden_beacon_bss pointer points to the BSS struct holding the 37 * beacon's information. 38 * 39 * Reference counting is done for all these references except for 40 * the hidden_list, so that a beacon BSS struct that is otherwise 41 * not referenced has one reference for being on the bss_list and 42 * one for each probe response entry that points to it using the 43 * hidden_beacon_bss pointer. When a BSS struct that has such a 44 * pointer is get/put, the refcount update is also propagated to 45 * the referenced struct, this ensure that it cannot get removed 46 * while somebody is using the probe response version. 47 * 48 * Note that the hidden_beacon_bss pointer never changes, due to 49 * the reference counting. Therefore, no locking is needed for 50 * it. 51 * 52 * Also note that the hidden_beacon_bss pointer is only relevant 53 * if the driver uses something other than the IEs, e.g. private 54 * data stored stored in the BSS struct, since the beacon IEs are 55 * also linked into the probe response struct. 56 */ 57 58#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) 59 60static void bss_free(struct cfg80211_internal_bss *bss) 61{ 62 struct cfg80211_bss_ies *ies; 63 64 if (WARN_ON(atomic_read(&bss->hold))) 65 return; 66 67 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); 68 if (ies && !bss->pub.hidden_beacon_bss) 69 kfree_rcu(ies, rcu_head); 70 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); 71 if (ies) 72 kfree_rcu(ies, rcu_head); 73 74 /* 75 * This happens when the module is removed, it doesn't 76 * really matter any more save for completeness 77 */ 78 if (!list_empty(&bss->hidden_list)) 79 list_del(&bss->hidden_list); 80 81 kfree(bss); 82} 83 84static inline void bss_ref_get(struct cfg80211_registered_device *dev, 85 struct cfg80211_internal_bss *bss) 86{ 87 lockdep_assert_held(&dev->bss_lock); 88 89 bss->refcount++; 90 if (bss->pub.hidden_beacon_bss) { 91 bss = container_of(bss->pub.hidden_beacon_bss, 92 struct cfg80211_internal_bss, 93 pub); 94 bss->refcount++; 95 } 96} 97 98static inline void bss_ref_put(struct cfg80211_registered_device *dev, 99 struct cfg80211_internal_bss *bss) 100{ 101 lockdep_assert_held(&dev->bss_lock); 102 103 if (bss->pub.hidden_beacon_bss) { 104 struct cfg80211_internal_bss *hbss; 105 hbss = container_of(bss->pub.hidden_beacon_bss, 106 struct cfg80211_internal_bss, 107 pub); 108 hbss->refcount--; 109 if (hbss->refcount == 0) 110 bss_free(hbss); 111 } 112 bss->refcount--; 113 if (bss->refcount == 0) 114 bss_free(bss); 115} 116 117static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, 118 struct cfg80211_internal_bss *bss) 119{ 120 lockdep_assert_held(&dev->bss_lock); 121 122 if (!list_empty(&bss->hidden_list)) { 123 /* 124 * don't remove the beacon entry if it has 125 * probe responses associated with it 126 */ 127 if (!bss->pub.hidden_beacon_bss) 128 return false; 129 /* 130 * if it's a probe response entry break its 131 * link to the other entries in the group 132 */ 133 list_del_init(&bss->hidden_list); 134 } 135 136 list_del_init(&bss->list); 137 rb_erase(&bss->rbn, &dev->bss_tree); 138 bss_ref_put(dev, bss); 139 return true; 140} 141 142static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, 143 unsigned long expire_time) 144{ 145 struct cfg80211_internal_bss *bss, *tmp; 146 bool expired = false; 147 148 lockdep_assert_held(&dev->bss_lock); 149 150 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 151 if (atomic_read(&bss->hold)) 152 continue; 153 if (!time_after(expire_time, bss->ts)) 154 continue; 155 156 if (__cfg80211_unlink_bss(dev, bss)) 157 expired = true; 158 } 159 160 if (expired) 161 dev->bss_generation++; 162} 163 164void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, 165 bool send_message) 166{ 167 struct cfg80211_scan_request *request; 168 struct wireless_dev *wdev; 169 struct sk_buff *msg; 170#ifdef CONFIG_CFG80211_WEXT 171 union iwreq_data wrqu; 172#endif 173 174 ASSERT_RTNL(); 175 176 if (rdev->scan_msg) { 177 nl80211_send_scan_result(rdev, rdev->scan_msg); 178 rdev->scan_msg = NULL; 179 return; 180 } 181 182 request = rdev->scan_req; 183 if (!request) 184 return; 185 186 wdev = request->wdev; 187 188 /* 189 * This must be before sending the other events! 190 * Otherwise, wpa_supplicant gets completely confused with 191 * wext events. 192 */ 193 if (wdev->netdev) 194 cfg80211_sme_scan_done(wdev->netdev); 195 196 if (!request->aborted && 197 request->flags & NL80211_SCAN_FLAG_FLUSH) { 198 /* flush entries from previous scans */ 199 spin_lock_bh(&rdev->bss_lock); 200 __cfg80211_bss_expire(rdev, request->scan_start); 201 spin_unlock_bh(&rdev->bss_lock); 202 } 203 204 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted); 205 206#ifdef CONFIG_CFG80211_WEXT 207 if (wdev->netdev && !request->aborted) { 208 memset(&wrqu, 0, sizeof(wrqu)); 209 210 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); 211 } 212#endif 213 214 if (wdev->netdev) 215 dev_put(wdev->netdev); 216 217 rdev->scan_req = NULL; 218 kfree(request); 219 220 if (!send_message) 221 rdev->scan_msg = msg; 222 else 223 nl80211_send_scan_result(rdev, msg); 224} 225 226void __cfg80211_scan_done(struct work_struct *wk) 227{ 228 struct cfg80211_registered_device *rdev; 229 230 rdev = container_of(wk, struct cfg80211_registered_device, 231 scan_done_wk); 232 233 rtnl_lock(); 234 ___cfg80211_scan_done(rdev, true); 235 rtnl_unlock(); 236} 237 238void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 239{ 240 trace_cfg80211_scan_done(request, aborted); 241 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 242 243 request->aborted = aborted; 244 request->notified = true; 245 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); 246} 247EXPORT_SYMBOL(cfg80211_scan_done); 248 249void __cfg80211_sched_scan_results(struct work_struct *wk) 250{ 251 struct cfg80211_registered_device *rdev; 252 struct cfg80211_sched_scan_request *request; 253 254 rdev = container_of(wk, struct cfg80211_registered_device, 255 sched_scan_results_wk); 256 257 rtnl_lock(); 258 259 request = rdev->sched_scan_req; 260 261 /* we don't have sched_scan_req anymore if the scan is stopping */ 262 if (request) { 263 if (request->flags & NL80211_SCAN_FLAG_FLUSH) { 264 /* flush entries from previous scans */ 265 spin_lock_bh(&rdev->bss_lock); 266 __cfg80211_bss_expire(rdev, request->scan_start); 267 spin_unlock_bh(&rdev->bss_lock); 268 request->scan_start = 269 jiffies + msecs_to_jiffies(request->interval); 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 if (wiphy_to_dev(wiphy)->sched_scan_req) 282 queue_work(cfg80211_wq, 283 &wiphy_to_dev(wiphy)->sched_scan_results_wk); 284} 285EXPORT_SYMBOL(cfg80211_sched_scan_results); 286 287void cfg80211_sched_scan_stopped(struct wiphy *wiphy) 288{ 289 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 290 291 trace_cfg80211_sched_scan_stopped(wiphy); 292 293 rtnl_lock(); 294 __cfg80211_stop_sched_scan(rdev, true); 295 rtnl_unlock(); 296} 297EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 298 299int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 300 bool driver_initiated) 301{ 302 struct net_device *dev; 303 304 ASSERT_RTNL(); 305 306 if (!rdev->sched_scan_req) 307 return -ENOENT; 308 309 dev = rdev->sched_scan_req->dev; 310 311 if (!driver_initiated) { 312 int err = rdev_sched_scan_stop(rdev, dev); 313 if (err) 314 return err; 315 } 316 317 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); 318 319 kfree(rdev->sched_scan_req); 320 rdev->sched_scan_req = NULL; 321 322 return 0; 323} 324 325void cfg80211_bss_age(struct cfg80211_registered_device *dev, 326 unsigned long age_secs) 327{ 328 struct cfg80211_internal_bss *bss; 329 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 330 331 spin_lock_bh(&dev->bss_lock); 332 list_for_each_entry(bss, &dev->bss_list, list) 333 bss->ts -= age_jiffies; 334 spin_unlock_bh(&dev->bss_lock); 335} 336 337void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 338{ 339 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 340} 341 342const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) 343{ 344 while (len > 2 && ies[0] != eid) { 345 len -= ies[1] + 2; 346 ies += ies[1] + 2; 347 } 348 if (len < 2) 349 return NULL; 350 if (len < 2 + ies[1]) 351 return NULL; 352 return ies; 353} 354EXPORT_SYMBOL(cfg80211_find_ie); 355 356const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, 357 const u8 *ies, int len) 358{ 359 struct ieee80211_vendor_ie *ie; 360 const u8 *pos = ies, *end = ies + len; 361 int ie_oui; 362 363 while (pos < end) { 364 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, 365 end - pos); 366 if (!pos) 367 return NULL; 368 369 ie = (struct ieee80211_vendor_ie *)pos; 370 371 /* make sure we can access ie->len */ 372 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); 373 374 if (ie->len < sizeof(*ie)) 375 goto cont; 376 377 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; 378 if (ie_oui == oui && ie->oui_type == oui_type) 379 return pos; 380cont: 381 pos += 2 + ie->len; 382 } 383 return NULL; 384} 385EXPORT_SYMBOL(cfg80211_find_vendor_ie); 386 387static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, 388 const u8 *ssid, size_t ssid_len) 389{ 390 const struct cfg80211_bss_ies *ies; 391 const u8 *ssidie; 392 393 if (bssid && !ether_addr_equal(a->bssid, bssid)) 394 return false; 395 396 if (!ssid) 397 return true; 398 399 ies = rcu_access_pointer(a->ies); 400 if (!ies) 401 return false; 402 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 403 if (!ssidie) 404 return false; 405 if (ssidie[1] != ssid_len) 406 return false; 407 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 408} 409 410/** 411 * enum bss_compare_mode - BSS compare mode 412 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) 413 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode 414 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode 415 */ 416enum bss_compare_mode { 417 BSS_CMP_REGULAR, 418 BSS_CMP_HIDE_ZLEN, 419 BSS_CMP_HIDE_NUL, 420}; 421 422static int cmp_bss(struct cfg80211_bss *a, 423 struct cfg80211_bss *b, 424 enum bss_compare_mode mode) 425{ 426 const struct cfg80211_bss_ies *a_ies, *b_ies; 427 const u8 *ie1 = NULL; 428 const u8 *ie2 = NULL; 429 int i, r; 430 431 if (a->channel != b->channel) 432 return b->channel->center_freq - a->channel->center_freq; 433 434 a_ies = rcu_access_pointer(a->ies); 435 if (!a_ies) 436 return -1; 437 b_ies = rcu_access_pointer(b->ies); 438 if (!b_ies) 439 return 1; 440 441 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 442 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, 443 a_ies->data, a_ies->len); 444 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) 445 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, 446 b_ies->data, b_ies->len); 447 if (ie1 && ie2) { 448 int mesh_id_cmp; 449 450 if (ie1[1] == ie2[1]) 451 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); 452 else 453 mesh_id_cmp = ie2[1] - ie1[1]; 454 455 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 456 a_ies->data, a_ies->len); 457 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 458 b_ies->data, b_ies->len); 459 if (ie1 && ie2) { 460 if (mesh_id_cmp) 461 return mesh_id_cmp; 462 if (ie1[1] != ie2[1]) 463 return ie2[1] - ie1[1]; 464 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 465 } 466 } 467 468 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 469 if (r) 470 return r; 471 472 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); 473 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); 474 475 if (!ie1 && !ie2) 476 return 0; 477 478 /* 479 * Note that with "hide_ssid", the function returns a match if 480 * the already-present BSS ("b") is a hidden SSID beacon for 481 * the new BSS ("a"). 482 */ 483 484 /* sort missing IE before (left of) present IE */ 485 if (!ie1) 486 return -1; 487 if (!ie2) 488 return 1; 489 490 switch (mode) { 491 case BSS_CMP_HIDE_ZLEN: 492 /* 493 * In ZLEN mode we assume the BSS entry we're 494 * looking for has a zero-length SSID. So if 495 * the one we're looking at right now has that, 496 * return 0. Otherwise, return the difference 497 * in length, but since we're looking for the 498 * 0-length it's really equivalent to returning 499 * the length of the one we're looking at. 500 * 501 * No content comparison is needed as we assume 502 * the content length is zero. 503 */ 504 return ie2[1]; 505 case BSS_CMP_REGULAR: 506 default: 507 /* sort by length first, then by contents */ 508 if (ie1[1] != ie2[1]) 509 return ie2[1] - ie1[1]; 510 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 511 case BSS_CMP_HIDE_NUL: 512 if (ie1[1] != ie2[1]) 513 return ie2[1] - ie1[1]; 514 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ 515 for (i = 0; i < ie2[1]; i++) 516 if (ie2[i + 2]) 517 return -1; 518 return 0; 519 } 520} 521 522/* Returned bss is reference counted and must be cleaned up appropriately. */ 523struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 524 struct ieee80211_channel *channel, 525 const u8 *bssid, 526 const u8 *ssid, size_t ssid_len, 527 u16 capa_mask, u16 capa_val) 528{ 529 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 530 struct cfg80211_internal_bss *bss, *res = NULL; 531 unsigned long now = jiffies; 532 533 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, 534 capa_val); 535 536 spin_lock_bh(&dev->bss_lock); 537 538 list_for_each_entry(bss, &dev->bss_list, list) { 539 if ((bss->pub.capability & capa_mask) != capa_val) 540 continue; 541 if (channel && bss->pub.channel != channel) 542 continue; 543 if (!is_valid_ether_addr(bss->pub.bssid)) 544 continue; 545 /* Don't get expired BSS structs */ 546 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 547 !atomic_read(&bss->hold)) 548 continue; 549 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 550 res = bss; 551 bss_ref_get(dev, res); 552 break; 553 } 554 } 555 556 spin_unlock_bh(&dev->bss_lock); 557 if (!res) 558 return NULL; 559 trace_cfg80211_return_bss(&res->pub); 560 return &res->pub; 561} 562EXPORT_SYMBOL(cfg80211_get_bss); 563 564static void rb_insert_bss(struct cfg80211_registered_device *dev, 565 struct cfg80211_internal_bss *bss) 566{ 567 struct rb_node **p = &dev->bss_tree.rb_node; 568 struct rb_node *parent = NULL; 569 struct cfg80211_internal_bss *tbss; 570 int cmp; 571 572 while (*p) { 573 parent = *p; 574 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 575 576 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); 577 578 if (WARN_ON(!cmp)) { 579 /* will sort of leak this BSS */ 580 return; 581 } 582 583 if (cmp < 0) 584 p = &(*p)->rb_left; 585 else 586 p = &(*p)->rb_right; 587 } 588 589 rb_link_node(&bss->rbn, parent, p); 590 rb_insert_color(&bss->rbn, &dev->bss_tree); 591} 592 593static struct cfg80211_internal_bss * 594rb_find_bss(struct cfg80211_registered_device *dev, 595 struct cfg80211_internal_bss *res, 596 enum bss_compare_mode mode) 597{ 598 struct rb_node *n = dev->bss_tree.rb_node; 599 struct cfg80211_internal_bss *bss; 600 int r; 601 602 while (n) { 603 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 604 r = cmp_bss(&res->pub, &bss->pub, mode); 605 606 if (r == 0) 607 return bss; 608 else if (r < 0) 609 n = n->rb_left; 610 else 611 n = n->rb_right; 612 } 613 614 return NULL; 615} 616 617static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev, 618 struct cfg80211_internal_bss *new) 619{ 620 const struct cfg80211_bss_ies *ies; 621 struct cfg80211_internal_bss *bss; 622 const u8 *ie; 623 int i, ssidlen; 624 u8 fold = 0; 625 626 ies = rcu_access_pointer(new->pub.beacon_ies); 627 if (WARN_ON(!ies)) 628 return false; 629 630 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 631 if (!ie) { 632 /* nothing to do */ 633 return true; 634 } 635 636 ssidlen = ie[1]; 637 for (i = 0; i < ssidlen; i++) 638 fold |= ie[2 + i]; 639 640 if (fold) { 641 /* not a hidden SSID */ 642 return true; 643 } 644 645 /* This is the bad part ... */ 646 647 list_for_each_entry(bss, &dev->bss_list, list) { 648 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) 649 continue; 650 if (bss->pub.channel != new->pub.channel) 651 continue; 652 if (bss->pub.scan_width != new->pub.scan_width) 653 continue; 654 if (rcu_access_pointer(bss->pub.beacon_ies)) 655 continue; 656 ies = rcu_access_pointer(bss->pub.ies); 657 if (!ies) 658 continue; 659 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 660 if (!ie) 661 continue; 662 if (ssidlen && ie[1] != ssidlen) 663 continue; 664 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 665 continue; 666 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 667 list_del(&bss->hidden_list); 668 /* combine them */ 669 list_add(&bss->hidden_list, &new->hidden_list); 670 bss->pub.hidden_beacon_bss = &new->pub; 671 new->refcount += bss->refcount; 672 rcu_assign_pointer(bss->pub.beacon_ies, 673 new->pub.beacon_ies); 674 } 675 676 return true; 677} 678 679/* Returned bss is reference counted and must be cleaned up appropriately. */ 680static struct cfg80211_internal_bss * 681cfg80211_bss_update(struct cfg80211_registered_device *dev, 682 struct cfg80211_internal_bss *tmp, 683 bool signal_valid) 684{ 685 struct cfg80211_internal_bss *found = NULL; 686 687 if (WARN_ON(!tmp->pub.channel)) 688 return NULL; 689 690 tmp->ts = jiffies; 691 692 spin_lock_bh(&dev->bss_lock); 693 694 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { 695 spin_unlock_bh(&dev->bss_lock); 696 return NULL; 697 } 698 699 found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); 700 701 if (found) { 702 /* Update IEs */ 703 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 704 const struct cfg80211_bss_ies *old; 705 706 old = rcu_access_pointer(found->pub.proberesp_ies); 707 708 rcu_assign_pointer(found->pub.proberesp_ies, 709 tmp->pub.proberesp_ies); 710 /* Override possible earlier Beacon frame IEs */ 711 rcu_assign_pointer(found->pub.ies, 712 tmp->pub.proberesp_ies); 713 if (old) 714 kfree_rcu((struct cfg80211_bss_ies *)old, 715 rcu_head); 716 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { 717 const struct cfg80211_bss_ies *old; 718 struct cfg80211_internal_bss *bss; 719 720 if (found->pub.hidden_beacon_bss && 721 !list_empty(&found->hidden_list)) { 722 const struct cfg80211_bss_ies *f; 723 724 /* 725 * The found BSS struct is one of the probe 726 * response members of a group, but we're 727 * receiving a beacon (beacon_ies in the tmp 728 * bss is used). This can only mean that the 729 * AP changed its beacon from not having an 730 * SSID to showing it, which is confusing so 731 * drop this information. 732 */ 733 734 f = rcu_access_pointer(tmp->pub.beacon_ies); 735 kfree_rcu((struct cfg80211_bss_ies *)f, 736 rcu_head); 737 goto drop; 738 } 739 740 old = rcu_access_pointer(found->pub.beacon_ies); 741 742 rcu_assign_pointer(found->pub.beacon_ies, 743 tmp->pub.beacon_ies); 744 745 /* Override IEs if they were from a beacon before */ 746 if (old == rcu_access_pointer(found->pub.ies)) 747 rcu_assign_pointer(found->pub.ies, 748 tmp->pub.beacon_ies); 749 750 /* Assign beacon IEs to all sub entries */ 751 list_for_each_entry(bss, &found->hidden_list, 752 hidden_list) { 753 const struct cfg80211_bss_ies *ies; 754 755 ies = rcu_access_pointer(bss->pub.beacon_ies); 756 WARN_ON(ies != old); 757 758 rcu_assign_pointer(bss->pub.beacon_ies, 759 tmp->pub.beacon_ies); 760 } 761 762 if (old) 763 kfree_rcu((struct cfg80211_bss_ies *)old, 764 rcu_head); 765 } 766 767 found->pub.beacon_interval = tmp->pub.beacon_interval; 768 /* 769 * don't update the signal if beacon was heard on 770 * adjacent channel. 771 */ 772 if (signal_valid) 773 found->pub.signal = tmp->pub.signal; 774 found->pub.capability = tmp->pub.capability; 775 found->ts = tmp->ts; 776 } else { 777 struct cfg80211_internal_bss *new; 778 struct cfg80211_internal_bss *hidden; 779 struct cfg80211_bss_ies *ies; 780 781 /* 782 * create a copy -- the "res" variable that is passed in 783 * is allocated on the stack since it's not needed in the 784 * more common case of an update 785 */ 786 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, 787 GFP_ATOMIC); 788 if (!new) { 789 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 790 if (ies) 791 kfree_rcu(ies, rcu_head); 792 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 793 if (ies) 794 kfree_rcu(ies, rcu_head); 795 goto drop; 796 } 797 memcpy(new, tmp, sizeof(*new)); 798 new->refcount = 1; 799 INIT_LIST_HEAD(&new->hidden_list); 800 801 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 802 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); 803 if (!hidden) 804 hidden = rb_find_bss(dev, tmp, 805 BSS_CMP_HIDE_NUL); 806 if (hidden) { 807 new->pub.hidden_beacon_bss = &hidden->pub; 808 list_add(&new->hidden_list, 809 &hidden->hidden_list); 810 hidden->refcount++; 811 rcu_assign_pointer(new->pub.beacon_ies, 812 hidden->pub.beacon_ies); 813 } 814 } else { 815 /* 816 * Ok so we found a beacon, and don't have an entry. If 817 * it's a beacon with hidden SSID, we might be in for an 818 * expensive search for any probe responses that should 819 * be grouped with this beacon for updates ... 820 */ 821 if (!cfg80211_combine_bsses(dev, new)) { 822 kfree(new); 823 goto drop; 824 } 825 } 826 827 list_add_tail(&new->list, &dev->bss_list); 828 rb_insert_bss(dev, new); 829 found = new; 830 } 831 832 dev->bss_generation++; 833 bss_ref_get(dev, found); 834 spin_unlock_bh(&dev->bss_lock); 835 836 return found; 837 drop: 838 spin_unlock_bh(&dev->bss_lock); 839 return NULL; 840} 841 842static struct ieee80211_channel * 843cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 844 struct ieee80211_channel *channel) 845{ 846 const u8 *tmp; 847 u32 freq; 848 int channel_number = -1; 849 850 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); 851 if (tmp && tmp[1] == 1) { 852 channel_number = tmp[2]; 853 } else { 854 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); 855 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { 856 struct ieee80211_ht_operation *htop = (void *)(tmp + 2); 857 858 channel_number = htop->primary_chan; 859 } 860 } 861 862 if (channel_number < 0) 863 return channel; 864 865 freq = ieee80211_channel_to_frequency(channel_number, channel->band); 866 channel = ieee80211_get_channel(wiphy, freq); 867 if (!channel) 868 return NULL; 869 if (channel->flags & IEEE80211_CHAN_DISABLED) 870 return NULL; 871 return channel; 872} 873 874/* Returned bss is reference counted and must be cleaned up appropriately. */ 875struct cfg80211_bss* 876cfg80211_inform_bss_width(struct wiphy *wiphy, 877 struct ieee80211_channel *rx_channel, 878 enum nl80211_bss_scan_width scan_width, 879 const u8 *bssid, u64 tsf, u16 capability, 880 u16 beacon_interval, const u8 *ie, size_t ielen, 881 s32 signal, gfp_t gfp) 882{ 883 struct cfg80211_bss_ies *ies; 884 struct ieee80211_channel *channel; 885 struct cfg80211_internal_bss tmp = {}, *res; 886 887 if (WARN_ON(!wiphy)) 888 return NULL; 889 890 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 891 (signal < 0 || signal > 100))) 892 return NULL; 893 894 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel); 895 if (!channel) 896 return NULL; 897 898 memcpy(tmp.pub.bssid, bssid, ETH_ALEN); 899 tmp.pub.channel = channel; 900 tmp.pub.scan_width = scan_width; 901 tmp.pub.signal = signal; 902 tmp.pub.beacon_interval = beacon_interval; 903 tmp.pub.capability = capability; 904 /* 905 * Since we do not know here whether the IEs are from a Beacon or Probe 906 * Response frame, we need to pick one of the options and only use it 907 * with the driver that does not provide the full Beacon/Probe Response 908 * frame. Use Beacon frame pointer to avoid indicating that this should 909 * override the IEs pointer should we have received an earlier 910 * indication of Probe Response data. 911 */ 912 ies = kmalloc(sizeof(*ies) + ielen, gfp); 913 if (!ies) 914 return NULL; 915 ies->len = ielen; 916 ies->tsf = tsf; 917 memcpy(ies->data, ie, ielen); 918 919 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 920 rcu_assign_pointer(tmp.pub.ies, ies); 921 922 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, 923 rx_channel == channel); 924 if (!res) 925 return NULL; 926 927 if (res->pub.capability & WLAN_CAPABILITY_ESS) 928 regulatory_hint_found_beacon(wiphy, channel, gfp); 929 930 trace_cfg80211_return_bss(&res->pub); 931 /* cfg80211_bss_update gives us a referenced result */ 932 return &res->pub; 933} 934EXPORT_SYMBOL(cfg80211_inform_bss_width); 935 936/* Returned bss is reference counted and must be cleaned up appropriately. */ 937struct cfg80211_bss * 938cfg80211_inform_bss_width_frame(struct wiphy *wiphy, 939 struct ieee80211_channel *rx_channel, 940 enum nl80211_bss_scan_width scan_width, 941 struct ieee80211_mgmt *mgmt, size_t len, 942 s32 signal, gfp_t gfp) 943{ 944 struct cfg80211_internal_bss tmp = {}, *res; 945 struct cfg80211_bss_ies *ies; 946 struct ieee80211_channel *channel; 947 size_t ielen = len - offsetof(struct ieee80211_mgmt, 948 u.probe_resp.variable); 949 950 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 951 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 952 953 trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt, 954 len, signal); 955 956 if (WARN_ON(!mgmt)) 957 return NULL; 958 959 if (WARN_ON(!wiphy)) 960 return NULL; 961 962 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 963 (signal < 0 || signal > 100))) 964 return NULL; 965 966 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 967 return NULL; 968 969 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, 970 ielen, rx_channel); 971 if (!channel) 972 return NULL; 973 974 ies = kmalloc(sizeof(*ies) + ielen, gfp); 975 if (!ies) 976 return NULL; 977 ies->len = ielen; 978 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 979 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); 980 981 if (ieee80211_is_probe_resp(mgmt->frame_control)) 982 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 983 else 984 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 985 rcu_assign_pointer(tmp.pub.ies, ies); 986 987 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); 988 tmp.pub.channel = channel; 989 tmp.pub.scan_width = scan_width; 990 tmp.pub.signal = signal; 991 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 992 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 993 994 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, 995 rx_channel == channel); 996 if (!res) 997 return NULL; 998 999 if (res->pub.capability & WLAN_CAPABILITY_ESS) 1000 regulatory_hint_found_beacon(wiphy, channel, gfp); 1001 1002 trace_cfg80211_return_bss(&res->pub); 1003 /* cfg80211_bss_update gives us a referenced result */ 1004 return &res->pub; 1005} 1006EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); 1007 1008void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1009{ 1010 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1011 struct cfg80211_internal_bss *bss; 1012 1013 if (!pub) 1014 return; 1015 1016 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1017 1018 spin_lock_bh(&dev->bss_lock); 1019 bss_ref_get(dev, bss); 1020 spin_unlock_bh(&dev->bss_lock); 1021} 1022EXPORT_SYMBOL(cfg80211_ref_bss); 1023 1024void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1025{ 1026 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1027 struct cfg80211_internal_bss *bss; 1028 1029 if (!pub) 1030 return; 1031 1032 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1033 1034 spin_lock_bh(&dev->bss_lock); 1035 bss_ref_put(dev, bss); 1036 spin_unlock_bh(&dev->bss_lock); 1037} 1038EXPORT_SYMBOL(cfg80211_put_bss); 1039 1040void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1041{ 1042 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1043 struct cfg80211_internal_bss *bss; 1044 1045 if (WARN_ON(!pub)) 1046 return; 1047 1048 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1049 1050 spin_lock_bh(&dev->bss_lock); 1051 if (!list_empty(&bss->list)) { 1052 if (__cfg80211_unlink_bss(dev, bss)) 1053 dev->bss_generation++; 1054 } 1055 spin_unlock_bh(&dev->bss_lock); 1056} 1057EXPORT_SYMBOL(cfg80211_unlink_bss); 1058 1059#ifdef CONFIG_CFG80211_WEXT 1060static struct cfg80211_registered_device * 1061cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 1062{ 1063 struct cfg80211_registered_device *rdev; 1064 struct net_device *dev; 1065 1066 ASSERT_RTNL(); 1067 1068 dev = dev_get_by_index(net, ifindex); 1069 if (!dev) 1070 return ERR_PTR(-ENODEV); 1071 if (dev->ieee80211_ptr) 1072 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 1073 else 1074 rdev = ERR_PTR(-ENODEV); 1075 dev_put(dev); 1076 return rdev; 1077} 1078 1079int cfg80211_wext_siwscan(struct net_device *dev, 1080 struct iw_request_info *info, 1081 union iwreq_data *wrqu, char *extra) 1082{ 1083 struct cfg80211_registered_device *rdev; 1084 struct wiphy *wiphy; 1085 struct iw_scan_req *wreq = NULL; 1086 struct cfg80211_scan_request *creq = NULL; 1087 int i, err, n_channels = 0; 1088 enum ieee80211_band band; 1089 1090 if (!netif_running(dev)) 1091 return -ENETDOWN; 1092 1093 if (wrqu->data.length == sizeof(struct iw_scan_req)) 1094 wreq = (struct iw_scan_req *)extra; 1095 1096 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1097 1098 if (IS_ERR(rdev)) 1099 return PTR_ERR(rdev); 1100 1101 if (rdev->scan_req || rdev->scan_msg) { 1102 err = -EBUSY; 1103 goto out; 1104 } 1105 1106 wiphy = &rdev->wiphy; 1107 1108 /* Determine number of channels, needed to allocate creq */ 1109 if (wreq && wreq->num_channels) 1110 n_channels = wreq->num_channels; 1111 else 1112 n_channels = ieee80211_get_num_supported_channels(wiphy); 1113 1114 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 1115 n_channels * sizeof(void *), 1116 GFP_ATOMIC); 1117 if (!creq) { 1118 err = -ENOMEM; 1119 goto out; 1120 } 1121 1122 creq->wiphy = wiphy; 1123 creq->wdev = dev->ieee80211_ptr; 1124 /* SSIDs come after channels */ 1125 creq->ssids = (void *)&creq->channels[n_channels]; 1126 creq->n_channels = n_channels; 1127 creq->n_ssids = 1; 1128 creq->scan_start = jiffies; 1129 1130 /* translate "Scan on frequencies" request */ 1131 i = 0; 1132 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1133 int j; 1134 1135 if (!wiphy->bands[band]) 1136 continue; 1137 1138 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 1139 /* ignore disabled channels */ 1140 if (wiphy->bands[band]->channels[j].flags & 1141 IEEE80211_CHAN_DISABLED) 1142 continue; 1143 1144 /* If we have a wireless request structure and the 1145 * wireless request specifies frequencies, then search 1146 * for the matching hardware channel. 1147 */ 1148 if (wreq && wreq->num_channels) { 1149 int k; 1150 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 1151 for (k = 0; k < wreq->num_channels; k++) { 1152 struct iw_freq *freq = 1153 &wreq->channel_list[k]; 1154 int wext_freq = 1155 cfg80211_wext_freq(freq); 1156 1157 if (wext_freq == wiphy_freq) 1158 goto wext_freq_found; 1159 } 1160 goto wext_freq_not_found; 1161 } 1162 1163 wext_freq_found: 1164 creq->channels[i] = &wiphy->bands[band]->channels[j]; 1165 i++; 1166 wext_freq_not_found: ; 1167 } 1168 } 1169 /* No channels found? */ 1170 if (!i) { 1171 err = -EINVAL; 1172 goto out; 1173 } 1174 1175 /* Set real number of channels specified in creq->channels[] */ 1176 creq->n_channels = i; 1177 1178 /* translate "Scan for SSID" request */ 1179 if (wreq) { 1180 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1181 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1182 err = -EINVAL; 1183 goto out; 1184 } 1185 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1186 creq->ssids[0].ssid_len = wreq->essid_len; 1187 } 1188 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1189 creq->n_ssids = 0; 1190 } 1191 1192 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1193 if (wiphy->bands[i]) 1194 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1195 1196 rdev->scan_req = creq; 1197 err = rdev_scan(rdev, creq); 1198 if (err) { 1199 rdev->scan_req = NULL; 1200 /* creq will be freed below */ 1201 } else { 1202 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 1203 /* creq now owned by driver */ 1204 creq = NULL; 1205 dev_hold(dev); 1206 } 1207 out: 1208 kfree(creq); 1209 return err; 1210} 1211EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1212 1213static void ieee80211_scan_add_ies(struct iw_request_info *info, 1214 const struct cfg80211_bss_ies *ies, 1215 char **current_ev, char *end_buf) 1216{ 1217 const u8 *pos, *end, *next; 1218 struct iw_event iwe; 1219 1220 if (!ies) 1221 return; 1222 1223 /* 1224 * If needed, fragment the IEs buffer (at IE boundaries) into short 1225 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1226 */ 1227 pos = ies->data; 1228 end = pos + ies->len; 1229 1230 while (end - pos > IW_GENERIC_IE_MAX) { 1231 next = pos + 2 + pos[1]; 1232 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1233 next = next + 2 + next[1]; 1234 1235 memset(&iwe, 0, sizeof(iwe)); 1236 iwe.cmd = IWEVGENIE; 1237 iwe.u.data.length = next - pos; 1238 *current_ev = iwe_stream_add_point(info, *current_ev, 1239 end_buf, &iwe, 1240 (void *)pos); 1241 1242 pos = next; 1243 } 1244 1245 if (end > pos) { 1246 memset(&iwe, 0, sizeof(iwe)); 1247 iwe.cmd = IWEVGENIE; 1248 iwe.u.data.length = end - pos; 1249 *current_ev = iwe_stream_add_point(info, *current_ev, 1250 end_buf, &iwe, 1251 (void *)pos); 1252 } 1253} 1254 1255static char * 1256ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1257 struct cfg80211_internal_bss *bss, char *current_ev, 1258 char *end_buf) 1259{ 1260 const struct cfg80211_bss_ies *ies; 1261 struct iw_event iwe; 1262 const u8 *ie; 1263 u8 *buf, *cfg, *p; 1264 int rem, i, sig; 1265 bool ismesh = false; 1266 1267 memset(&iwe, 0, sizeof(iwe)); 1268 iwe.cmd = SIOCGIWAP; 1269 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1270 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1271 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1272 IW_EV_ADDR_LEN); 1273 1274 memset(&iwe, 0, sizeof(iwe)); 1275 iwe.cmd = SIOCGIWFREQ; 1276 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1277 iwe.u.freq.e = 0; 1278 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1279 IW_EV_FREQ_LEN); 1280 1281 memset(&iwe, 0, sizeof(iwe)); 1282 iwe.cmd = SIOCGIWFREQ; 1283 iwe.u.freq.m = bss->pub.channel->center_freq; 1284 iwe.u.freq.e = 6; 1285 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1286 IW_EV_FREQ_LEN); 1287 1288 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1289 memset(&iwe, 0, sizeof(iwe)); 1290 iwe.cmd = IWEVQUAL; 1291 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1292 IW_QUAL_NOISE_INVALID | 1293 IW_QUAL_QUAL_UPDATED; 1294 switch (wiphy->signal_type) { 1295 case CFG80211_SIGNAL_TYPE_MBM: 1296 sig = bss->pub.signal / 100; 1297 iwe.u.qual.level = sig; 1298 iwe.u.qual.updated |= IW_QUAL_DBM; 1299 if (sig < -110) /* rather bad */ 1300 sig = -110; 1301 else if (sig > -40) /* perfect */ 1302 sig = -40; 1303 /* will give a range of 0 .. 70 */ 1304 iwe.u.qual.qual = sig + 110; 1305 break; 1306 case CFG80211_SIGNAL_TYPE_UNSPEC: 1307 iwe.u.qual.level = bss->pub.signal; 1308 /* will give range 0 .. 100 */ 1309 iwe.u.qual.qual = bss->pub.signal; 1310 break; 1311 default: 1312 /* not reached */ 1313 break; 1314 } 1315 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1316 &iwe, IW_EV_QUAL_LEN); 1317 } 1318 1319 memset(&iwe, 0, sizeof(iwe)); 1320 iwe.cmd = SIOCGIWENCODE; 1321 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1322 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1323 else 1324 iwe.u.data.flags = IW_ENCODE_DISABLED; 1325 iwe.u.data.length = 0; 1326 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1327 &iwe, ""); 1328 1329 rcu_read_lock(); 1330 ies = rcu_dereference(bss->pub.ies); 1331 rem = ies->len; 1332 ie = ies->data; 1333 1334 while (rem >= 2) { 1335 /* invalid data */ 1336 if (ie[1] > rem - 2) 1337 break; 1338 1339 switch (ie[0]) { 1340 case WLAN_EID_SSID: 1341 memset(&iwe, 0, sizeof(iwe)); 1342 iwe.cmd = SIOCGIWESSID; 1343 iwe.u.data.length = ie[1]; 1344 iwe.u.data.flags = 1; 1345 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1346 &iwe, (u8 *)ie + 2); 1347 break; 1348 case WLAN_EID_MESH_ID: 1349 memset(&iwe, 0, sizeof(iwe)); 1350 iwe.cmd = SIOCGIWESSID; 1351 iwe.u.data.length = ie[1]; 1352 iwe.u.data.flags = 1; 1353 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1354 &iwe, (u8 *)ie + 2); 1355 break; 1356 case WLAN_EID_MESH_CONFIG: 1357 ismesh = true; 1358 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1359 break; 1360 buf = kmalloc(50, GFP_ATOMIC); 1361 if (!buf) 1362 break; 1363 cfg = (u8 *)ie + 2; 1364 memset(&iwe, 0, sizeof(iwe)); 1365 iwe.cmd = IWEVCUSTOM; 1366 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1367 "0x%02X", cfg[0]); 1368 iwe.u.data.length = strlen(buf); 1369 current_ev = iwe_stream_add_point(info, current_ev, 1370 end_buf, 1371 &iwe, buf); 1372 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1373 cfg[1]); 1374 iwe.u.data.length = strlen(buf); 1375 current_ev = iwe_stream_add_point(info, current_ev, 1376 end_buf, 1377 &iwe, buf); 1378 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1379 cfg[2]); 1380 iwe.u.data.length = strlen(buf); 1381 current_ev = iwe_stream_add_point(info, current_ev, 1382 end_buf, 1383 &iwe, buf); 1384 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1385 iwe.u.data.length = strlen(buf); 1386 current_ev = iwe_stream_add_point(info, current_ev, 1387 end_buf, 1388 &iwe, buf); 1389 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1390 iwe.u.data.length = strlen(buf); 1391 current_ev = iwe_stream_add_point(info, current_ev, 1392 end_buf, 1393 &iwe, buf); 1394 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1395 iwe.u.data.length = strlen(buf); 1396 current_ev = iwe_stream_add_point(info, current_ev, 1397 end_buf, 1398 &iwe, buf); 1399 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1400 iwe.u.data.length = strlen(buf); 1401 current_ev = iwe_stream_add_point(info, current_ev, 1402 end_buf, 1403 &iwe, buf); 1404 kfree(buf); 1405 break; 1406 case WLAN_EID_SUPP_RATES: 1407 case WLAN_EID_EXT_SUPP_RATES: 1408 /* display all supported rates in readable format */ 1409 p = current_ev + iwe_stream_lcp_len(info); 1410 1411 memset(&iwe, 0, sizeof(iwe)); 1412 iwe.cmd = SIOCGIWRATE; 1413 /* Those two flags are ignored... */ 1414 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1415 1416 for (i = 0; i < ie[1]; i++) { 1417 iwe.u.bitrate.value = 1418 ((ie[i + 2] & 0x7f) * 500000); 1419 p = iwe_stream_add_value(info, current_ev, p, 1420 end_buf, &iwe, IW_EV_PARAM_LEN); 1421 } 1422 current_ev = p; 1423 break; 1424 } 1425 rem -= ie[1] + 2; 1426 ie += ie[1] + 2; 1427 } 1428 1429 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1430 ismesh) { 1431 memset(&iwe, 0, sizeof(iwe)); 1432 iwe.cmd = SIOCGIWMODE; 1433 if (ismesh) 1434 iwe.u.mode = IW_MODE_MESH; 1435 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1436 iwe.u.mode = IW_MODE_MASTER; 1437 else 1438 iwe.u.mode = IW_MODE_ADHOC; 1439 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1440 &iwe, IW_EV_UINT_LEN); 1441 } 1442 1443 buf = kmalloc(31, GFP_ATOMIC); 1444 if (buf) { 1445 memset(&iwe, 0, sizeof(iwe)); 1446 iwe.cmd = IWEVCUSTOM; 1447 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); 1448 iwe.u.data.length = strlen(buf); 1449 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1450 &iwe, buf); 1451 memset(&iwe, 0, sizeof(iwe)); 1452 iwe.cmd = IWEVCUSTOM; 1453 sprintf(buf, " Last beacon: %ums ago", 1454 elapsed_jiffies_msecs(bss->ts)); 1455 iwe.u.data.length = strlen(buf); 1456 current_ev = iwe_stream_add_point(info, current_ev, 1457 end_buf, &iwe, buf); 1458 kfree(buf); 1459 } 1460 1461 ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); 1462 rcu_read_unlock(); 1463 1464 return current_ev; 1465} 1466 1467 1468static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1469 struct iw_request_info *info, 1470 char *buf, size_t len) 1471{ 1472 char *current_ev = buf; 1473 char *end_buf = buf + len; 1474 struct cfg80211_internal_bss *bss; 1475 1476 spin_lock_bh(&dev->bss_lock); 1477 cfg80211_bss_expire(dev); 1478 1479 list_for_each_entry(bss, &dev->bss_list, list) { 1480 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1481 spin_unlock_bh(&dev->bss_lock); 1482 return -E2BIG; 1483 } 1484 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1485 current_ev, end_buf); 1486 } 1487 spin_unlock_bh(&dev->bss_lock); 1488 return current_ev - buf; 1489} 1490 1491 1492int cfg80211_wext_giwscan(struct net_device *dev, 1493 struct iw_request_info *info, 1494 struct iw_point *data, char *extra) 1495{ 1496 struct cfg80211_registered_device *rdev; 1497 int res; 1498 1499 if (!netif_running(dev)) 1500 return -ENETDOWN; 1501 1502 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1503 1504 if (IS_ERR(rdev)) 1505 return PTR_ERR(rdev); 1506 1507 if (rdev->scan_req || rdev->scan_msg) 1508 return -EAGAIN; 1509 1510 res = ieee80211_scan_results(rdev, info, extra, data->length); 1511 data->length = 0; 1512 if (res >= 0) { 1513 data->length = res; 1514 res = 0; 1515 } 1516 1517 return res; 1518} 1519EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1520#endif 1521