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 60 static 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 84 static 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 98 static 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 } 116 117 static 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 } 141 142 static 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 } 163 164 void ___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 } 225 226 void __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 } 237 238 void 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 } 247 EXPORT_SYMBOL(cfg80211_scan_done); 248 249 void __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 } 276 277 void 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 } 285 EXPORT_SYMBOL(cfg80211_sched_scan_results); 286 287 void 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 } 297 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 298 299 int __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 } 324 325 void 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 } 336 337 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 338 { 339 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 340 } 341 342 const 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 } 354 EXPORT_SYMBOL(cfg80211_find_ie); 355 356 const 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; 380 cont: 381 pos += 2 + ie->len; 382 } 383 return NULL; 384 } 385 EXPORT_SYMBOL(cfg80211_find_vendor_ie); 386 387 static 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 */ 416 enum bss_compare_mode { 417 BSS_CMP_REGULAR, 418 BSS_CMP_HIDE_ZLEN, 419 BSS_CMP_HIDE_NUL, 420 }; 421 422 static 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. */ 523 struct 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 /* Don't get expired BSS structs */ 544 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 545 !atomic_read(&bss->hold)) 546 continue; 547 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 548 res = bss; 549 bss_ref_get(dev, res); 550 break; 551 } 552 } 553 554 spin_unlock_bh(&dev->bss_lock); 555 if (!res) 556 return NULL; 557 trace_cfg80211_return_bss(&res->pub); 558 return &res->pub; 559 } 560 EXPORT_SYMBOL(cfg80211_get_bss); 561 562 static void rb_insert_bss(struct cfg80211_registered_device *dev, 563 struct cfg80211_internal_bss *bss) 564 { 565 struct rb_node **p = &dev->bss_tree.rb_node; 566 struct rb_node *parent = NULL; 567 struct cfg80211_internal_bss *tbss; 568 int cmp; 569 570 while (*p) { 571 parent = *p; 572 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 573 574 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); 575 576 if (WARN_ON(!cmp)) { 577 /* will sort of leak this BSS */ 578 return; 579 } 580 581 if (cmp < 0) 582 p = &(*p)->rb_left; 583 else 584 p = &(*p)->rb_right; 585 } 586 587 rb_link_node(&bss->rbn, parent, p); 588 rb_insert_color(&bss->rbn, &dev->bss_tree); 589 } 590 591 static struct cfg80211_internal_bss * 592 rb_find_bss(struct cfg80211_registered_device *dev, 593 struct cfg80211_internal_bss *res, 594 enum bss_compare_mode mode) 595 { 596 struct rb_node *n = dev->bss_tree.rb_node; 597 struct cfg80211_internal_bss *bss; 598 int r; 599 600 while (n) { 601 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 602 r = cmp_bss(&res->pub, &bss->pub, mode); 603 604 if (r == 0) 605 return bss; 606 else if (r < 0) 607 n = n->rb_left; 608 else 609 n = n->rb_right; 610 } 611 612 return NULL; 613 } 614 615 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev, 616 struct cfg80211_internal_bss *new) 617 { 618 const struct cfg80211_bss_ies *ies; 619 struct cfg80211_internal_bss *bss; 620 const u8 *ie; 621 int i, ssidlen; 622 u8 fold = 0; 623 624 ies = rcu_access_pointer(new->pub.beacon_ies); 625 if (WARN_ON(!ies)) 626 return false; 627 628 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 629 if (!ie) { 630 /* nothing to do */ 631 return true; 632 } 633 634 ssidlen = ie[1]; 635 for (i = 0; i < ssidlen; i++) 636 fold |= ie[2 + i]; 637 638 if (fold) { 639 /* not a hidden SSID */ 640 return true; 641 } 642 643 /* This is the bad part ... */ 644 645 list_for_each_entry(bss, &dev->bss_list, list) { 646 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) 647 continue; 648 if (bss->pub.channel != new->pub.channel) 649 continue; 650 if (bss->pub.scan_width != new->pub.scan_width) 651 continue; 652 if (rcu_access_pointer(bss->pub.beacon_ies)) 653 continue; 654 ies = rcu_access_pointer(bss->pub.ies); 655 if (!ies) 656 continue; 657 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 658 if (!ie) 659 continue; 660 if (ssidlen && ie[1] != ssidlen) 661 continue; 662 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 663 continue; 664 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 665 list_del(&bss->hidden_list); 666 /* combine them */ 667 list_add(&bss->hidden_list, &new->hidden_list); 668 bss->pub.hidden_beacon_bss = &new->pub; 669 new->refcount += bss->refcount; 670 rcu_assign_pointer(bss->pub.beacon_ies, 671 new->pub.beacon_ies); 672 } 673 674 return true; 675 } 676 677 /* Returned bss is reference counted and must be cleaned up appropriately. */ 678 static struct cfg80211_internal_bss * 679 cfg80211_bss_update(struct cfg80211_registered_device *dev, 680 struct cfg80211_internal_bss *tmp, 681 bool signal_valid) 682 { 683 struct cfg80211_internal_bss *found = NULL; 684 685 if (WARN_ON(!tmp->pub.channel)) 686 return NULL; 687 688 tmp->ts = jiffies; 689 690 spin_lock_bh(&dev->bss_lock); 691 692 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { 693 spin_unlock_bh(&dev->bss_lock); 694 return NULL; 695 } 696 697 found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); 698 699 if (found) { 700 /* Update IEs */ 701 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 702 const struct cfg80211_bss_ies *old; 703 704 old = rcu_access_pointer(found->pub.proberesp_ies); 705 706 rcu_assign_pointer(found->pub.proberesp_ies, 707 tmp->pub.proberesp_ies); 708 /* Override possible earlier Beacon frame IEs */ 709 rcu_assign_pointer(found->pub.ies, 710 tmp->pub.proberesp_ies); 711 if (old) 712 kfree_rcu((struct cfg80211_bss_ies *)old, 713 rcu_head); 714 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { 715 const struct cfg80211_bss_ies *old; 716 struct cfg80211_internal_bss *bss; 717 718 if (found->pub.hidden_beacon_bss && 719 !list_empty(&found->hidden_list)) { 720 const struct cfg80211_bss_ies *f; 721 722 /* 723 * The found BSS struct is one of the probe 724 * response members of a group, but we're 725 * receiving a beacon (beacon_ies in the tmp 726 * bss is used). This can only mean that the 727 * AP changed its beacon from not having an 728 * SSID to showing it, which is confusing so 729 * drop this information. 730 */ 731 732 f = rcu_access_pointer(tmp->pub.beacon_ies); 733 kfree_rcu((struct cfg80211_bss_ies *)f, 734 rcu_head); 735 goto drop; 736 } 737 738 old = rcu_access_pointer(found->pub.beacon_ies); 739 740 rcu_assign_pointer(found->pub.beacon_ies, 741 tmp->pub.beacon_ies); 742 743 /* Override IEs if they were from a beacon before */ 744 if (old == rcu_access_pointer(found->pub.ies)) 745 rcu_assign_pointer(found->pub.ies, 746 tmp->pub.beacon_ies); 747 748 /* Assign beacon IEs to all sub entries */ 749 list_for_each_entry(bss, &found->hidden_list, 750 hidden_list) { 751 const struct cfg80211_bss_ies *ies; 752 753 ies = rcu_access_pointer(bss->pub.beacon_ies); 754 WARN_ON(ies != old); 755 756 rcu_assign_pointer(bss->pub.beacon_ies, 757 tmp->pub.beacon_ies); 758 } 759 760 if (old) 761 kfree_rcu((struct cfg80211_bss_ies *)old, 762 rcu_head); 763 } 764 765 found->pub.beacon_interval = tmp->pub.beacon_interval; 766 /* 767 * don't update the signal if beacon was heard on 768 * adjacent channel. 769 */ 770 if (signal_valid) 771 found->pub.signal = tmp->pub.signal; 772 found->pub.capability = tmp->pub.capability; 773 found->ts = tmp->ts; 774 } else { 775 struct cfg80211_internal_bss *new; 776 struct cfg80211_internal_bss *hidden; 777 struct cfg80211_bss_ies *ies; 778 779 /* 780 * create a copy -- the "res" variable that is passed in 781 * is allocated on the stack since it's not needed in the 782 * more common case of an update 783 */ 784 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, 785 GFP_ATOMIC); 786 if (!new) { 787 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 788 if (ies) 789 kfree_rcu(ies, rcu_head); 790 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 791 if (ies) 792 kfree_rcu(ies, rcu_head); 793 goto drop; 794 } 795 memcpy(new, tmp, sizeof(*new)); 796 new->refcount = 1; 797 INIT_LIST_HEAD(&new->hidden_list); 798 799 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 800 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); 801 if (!hidden) 802 hidden = rb_find_bss(dev, tmp, 803 BSS_CMP_HIDE_NUL); 804 if (hidden) { 805 new->pub.hidden_beacon_bss = &hidden->pub; 806 list_add(&new->hidden_list, 807 &hidden->hidden_list); 808 hidden->refcount++; 809 rcu_assign_pointer(new->pub.beacon_ies, 810 hidden->pub.beacon_ies); 811 } 812 } else { 813 /* 814 * Ok so we found a beacon, and don't have an entry. If 815 * it's a beacon with hidden SSID, we might be in for an 816 * expensive search for any probe responses that should 817 * be grouped with this beacon for updates ... 818 */ 819 if (!cfg80211_combine_bsses(dev, new)) { 820 kfree(new); 821 goto drop; 822 } 823 } 824 825 list_add_tail(&new->list, &dev->bss_list); 826 rb_insert_bss(dev, new); 827 found = new; 828 } 829 830 dev->bss_generation++; 831 bss_ref_get(dev, found); 832 spin_unlock_bh(&dev->bss_lock); 833 834 return found; 835 drop: 836 spin_unlock_bh(&dev->bss_lock); 837 return NULL; 838 } 839 840 static struct ieee80211_channel * 841 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 842 struct ieee80211_channel *channel) 843 { 844 const u8 *tmp; 845 u32 freq; 846 int channel_number = -1; 847 848 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); 849 if (tmp && tmp[1] == 1) { 850 channel_number = tmp[2]; 851 } else { 852 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); 853 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { 854 struct ieee80211_ht_operation *htop = (void *)(tmp + 2); 855 856 channel_number = htop->primary_chan; 857 } 858 } 859 860 if (channel_number < 0) 861 return channel; 862 863 freq = ieee80211_channel_to_frequency(channel_number, channel->band); 864 channel = ieee80211_get_channel(wiphy, freq); 865 if (!channel) 866 return NULL; 867 if (channel->flags & IEEE80211_CHAN_DISABLED) 868 return NULL; 869 return channel; 870 } 871 872 /* Returned bss is reference counted and must be cleaned up appropriately. */ 873 struct cfg80211_bss* 874 cfg80211_inform_bss_width(struct wiphy *wiphy, 875 struct ieee80211_channel *rx_channel, 876 enum nl80211_bss_scan_width scan_width, 877 const u8 *bssid, u64 tsf, u16 capability, 878 u16 beacon_interval, const u8 *ie, size_t ielen, 879 s32 signal, gfp_t gfp) 880 { 881 struct cfg80211_bss_ies *ies; 882 struct ieee80211_channel *channel; 883 struct cfg80211_internal_bss tmp = {}, *res; 884 885 if (WARN_ON(!wiphy)) 886 return NULL; 887 888 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 889 (signal < 0 || signal > 100))) 890 return NULL; 891 892 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel); 893 if (!channel) 894 return NULL; 895 896 memcpy(tmp.pub.bssid, bssid, ETH_ALEN); 897 tmp.pub.channel = channel; 898 tmp.pub.scan_width = scan_width; 899 tmp.pub.signal = signal; 900 tmp.pub.beacon_interval = beacon_interval; 901 tmp.pub.capability = capability; 902 /* 903 * Since we do not know here whether the IEs are from a Beacon or Probe 904 * Response frame, we need to pick one of the options and only use it 905 * with the driver that does not provide the full Beacon/Probe Response 906 * frame. Use Beacon frame pointer to avoid indicating that this should 907 * override the IEs pointer should we have received an earlier 908 * indication of Probe Response data. 909 */ 910 ies = kmalloc(sizeof(*ies) + ielen, gfp); 911 if (!ies) 912 return NULL; 913 ies->len = ielen; 914 ies->tsf = tsf; 915 memcpy(ies->data, ie, ielen); 916 917 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 918 rcu_assign_pointer(tmp.pub.ies, ies); 919 920 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, 921 rx_channel == channel); 922 if (!res) 923 return NULL; 924 925 if (res->pub.capability & WLAN_CAPABILITY_ESS) 926 regulatory_hint_found_beacon(wiphy, channel, gfp); 927 928 trace_cfg80211_return_bss(&res->pub); 929 /* cfg80211_bss_update gives us a referenced result */ 930 return &res->pub; 931 } 932 EXPORT_SYMBOL(cfg80211_inform_bss_width); 933 934 /* Returned bss is reference counted and must be cleaned up appropriately. */ 935 struct cfg80211_bss * 936 cfg80211_inform_bss_width_frame(struct wiphy *wiphy, 937 struct ieee80211_channel *rx_channel, 938 enum nl80211_bss_scan_width scan_width, 939 struct ieee80211_mgmt *mgmt, size_t len, 940 s32 signal, gfp_t gfp) 941 { 942 struct cfg80211_internal_bss tmp = {}, *res; 943 struct cfg80211_bss_ies *ies; 944 struct ieee80211_channel *channel; 945 size_t ielen = len - offsetof(struct ieee80211_mgmt, 946 u.probe_resp.variable); 947 948 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 949 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 950 951 trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt, 952 len, signal); 953 954 if (WARN_ON(!mgmt)) 955 return NULL; 956 957 if (WARN_ON(!wiphy)) 958 return NULL; 959 960 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 961 (signal < 0 || signal > 100))) 962 return NULL; 963 964 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 965 return NULL; 966 967 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, 968 ielen, rx_channel); 969 if (!channel) 970 return NULL; 971 972 ies = kmalloc(sizeof(*ies) + ielen, gfp); 973 if (!ies) 974 return NULL; 975 ies->len = ielen; 976 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 977 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); 978 979 if (ieee80211_is_probe_resp(mgmt->frame_control)) 980 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 981 else 982 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 983 rcu_assign_pointer(tmp.pub.ies, ies); 984 985 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); 986 tmp.pub.channel = channel; 987 tmp.pub.scan_width = scan_width; 988 tmp.pub.signal = signal; 989 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 990 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 991 992 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp, 993 rx_channel == channel); 994 if (!res) 995 return NULL; 996 997 if (res->pub.capability & WLAN_CAPABILITY_ESS) 998 regulatory_hint_found_beacon(wiphy, channel, gfp); 999 1000 trace_cfg80211_return_bss(&res->pub); 1001 /* cfg80211_bss_update gives us a referenced result */ 1002 return &res->pub; 1003 } 1004 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); 1005 1006 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1007 { 1008 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1009 struct cfg80211_internal_bss *bss; 1010 1011 if (!pub) 1012 return; 1013 1014 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1015 1016 spin_lock_bh(&dev->bss_lock); 1017 bss_ref_get(dev, bss); 1018 spin_unlock_bh(&dev->bss_lock); 1019 } 1020 EXPORT_SYMBOL(cfg80211_ref_bss); 1021 1022 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1023 { 1024 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1025 struct cfg80211_internal_bss *bss; 1026 1027 if (!pub) 1028 return; 1029 1030 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1031 1032 spin_lock_bh(&dev->bss_lock); 1033 bss_ref_put(dev, bss); 1034 spin_unlock_bh(&dev->bss_lock); 1035 } 1036 EXPORT_SYMBOL(cfg80211_put_bss); 1037 1038 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1039 { 1040 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1041 struct cfg80211_internal_bss *bss; 1042 1043 if (WARN_ON(!pub)) 1044 return; 1045 1046 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1047 1048 spin_lock_bh(&dev->bss_lock); 1049 if (!list_empty(&bss->list)) { 1050 if (__cfg80211_unlink_bss(dev, bss)) 1051 dev->bss_generation++; 1052 } 1053 spin_unlock_bh(&dev->bss_lock); 1054 } 1055 EXPORT_SYMBOL(cfg80211_unlink_bss); 1056 1057 #ifdef CONFIG_CFG80211_WEXT 1058 static struct cfg80211_registered_device * 1059 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 1060 { 1061 struct cfg80211_registered_device *rdev; 1062 struct net_device *dev; 1063 1064 ASSERT_RTNL(); 1065 1066 dev = dev_get_by_index(net, ifindex); 1067 if (!dev) 1068 return ERR_PTR(-ENODEV); 1069 if (dev->ieee80211_ptr) 1070 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 1071 else 1072 rdev = ERR_PTR(-ENODEV); 1073 dev_put(dev); 1074 return rdev; 1075 } 1076 1077 int cfg80211_wext_siwscan(struct net_device *dev, 1078 struct iw_request_info *info, 1079 union iwreq_data *wrqu, char *extra) 1080 { 1081 struct cfg80211_registered_device *rdev; 1082 struct wiphy *wiphy; 1083 struct iw_scan_req *wreq = NULL; 1084 struct cfg80211_scan_request *creq = NULL; 1085 int i, err, n_channels = 0; 1086 enum ieee80211_band band; 1087 1088 if (!netif_running(dev)) 1089 return -ENETDOWN; 1090 1091 if (wrqu->data.length == sizeof(struct iw_scan_req)) 1092 wreq = (struct iw_scan_req *)extra; 1093 1094 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1095 1096 if (IS_ERR(rdev)) 1097 return PTR_ERR(rdev); 1098 1099 if (rdev->scan_req || rdev->scan_msg) { 1100 err = -EBUSY; 1101 goto out; 1102 } 1103 1104 wiphy = &rdev->wiphy; 1105 1106 /* Determine number of channels, needed to allocate creq */ 1107 if (wreq && wreq->num_channels) 1108 n_channels = wreq->num_channels; 1109 else 1110 n_channels = ieee80211_get_num_supported_channels(wiphy); 1111 1112 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 1113 n_channels * sizeof(void *), 1114 GFP_ATOMIC); 1115 if (!creq) { 1116 err = -ENOMEM; 1117 goto out; 1118 } 1119 1120 creq->wiphy = wiphy; 1121 creq->wdev = dev->ieee80211_ptr; 1122 /* SSIDs come after channels */ 1123 creq->ssids = (void *)&creq->channels[n_channels]; 1124 creq->n_channels = n_channels; 1125 creq->n_ssids = 1; 1126 creq->scan_start = jiffies; 1127 1128 /* translate "Scan on frequencies" request */ 1129 i = 0; 1130 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1131 int j; 1132 1133 if (!wiphy->bands[band]) 1134 continue; 1135 1136 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 1137 /* ignore disabled channels */ 1138 if (wiphy->bands[band]->channels[j].flags & 1139 IEEE80211_CHAN_DISABLED) 1140 continue; 1141 1142 /* If we have a wireless request structure and the 1143 * wireless request specifies frequencies, then search 1144 * for the matching hardware channel. 1145 */ 1146 if (wreq && wreq->num_channels) { 1147 int k; 1148 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 1149 for (k = 0; k < wreq->num_channels; k++) { 1150 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 1151 if (wext_freq == wiphy_freq) 1152 goto wext_freq_found; 1153 } 1154 goto wext_freq_not_found; 1155 } 1156 1157 wext_freq_found: 1158 creq->channels[i] = &wiphy->bands[band]->channels[j]; 1159 i++; 1160 wext_freq_not_found: ; 1161 } 1162 } 1163 /* No channels found? */ 1164 if (!i) { 1165 err = -EINVAL; 1166 goto out; 1167 } 1168 1169 /* Set real number of channels specified in creq->channels[] */ 1170 creq->n_channels = i; 1171 1172 /* translate "Scan for SSID" request */ 1173 if (wreq) { 1174 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1175 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1176 err = -EINVAL; 1177 goto out; 1178 } 1179 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1180 creq->ssids[0].ssid_len = wreq->essid_len; 1181 } 1182 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1183 creq->n_ssids = 0; 1184 } 1185 1186 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1187 if (wiphy->bands[i]) 1188 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1189 1190 rdev->scan_req = creq; 1191 err = rdev_scan(rdev, creq); 1192 if (err) { 1193 rdev->scan_req = NULL; 1194 /* creq will be freed below */ 1195 } else { 1196 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 1197 /* creq now owned by driver */ 1198 creq = NULL; 1199 dev_hold(dev); 1200 } 1201 out: 1202 kfree(creq); 1203 return err; 1204 } 1205 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1206 1207 static void ieee80211_scan_add_ies(struct iw_request_info *info, 1208 const struct cfg80211_bss_ies *ies, 1209 char **current_ev, char *end_buf) 1210 { 1211 const u8 *pos, *end, *next; 1212 struct iw_event iwe; 1213 1214 if (!ies) 1215 return; 1216 1217 /* 1218 * If needed, fragment the IEs buffer (at IE boundaries) into short 1219 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1220 */ 1221 pos = ies->data; 1222 end = pos + ies->len; 1223 1224 while (end - pos > IW_GENERIC_IE_MAX) { 1225 next = pos + 2 + pos[1]; 1226 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1227 next = next + 2 + next[1]; 1228 1229 memset(&iwe, 0, sizeof(iwe)); 1230 iwe.cmd = IWEVGENIE; 1231 iwe.u.data.length = next - pos; 1232 *current_ev = iwe_stream_add_point(info, *current_ev, 1233 end_buf, &iwe, 1234 (void *)pos); 1235 1236 pos = next; 1237 } 1238 1239 if (end > pos) { 1240 memset(&iwe, 0, sizeof(iwe)); 1241 iwe.cmd = IWEVGENIE; 1242 iwe.u.data.length = end - pos; 1243 *current_ev = iwe_stream_add_point(info, *current_ev, 1244 end_buf, &iwe, 1245 (void *)pos); 1246 } 1247 } 1248 1249 static char * 1250 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1251 struct cfg80211_internal_bss *bss, char *current_ev, 1252 char *end_buf) 1253 { 1254 const struct cfg80211_bss_ies *ies; 1255 struct iw_event iwe; 1256 const u8 *ie; 1257 u8 *buf, *cfg, *p; 1258 int rem, i, sig; 1259 bool ismesh = false; 1260 1261 memset(&iwe, 0, sizeof(iwe)); 1262 iwe.cmd = SIOCGIWAP; 1263 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1264 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1265 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1266 IW_EV_ADDR_LEN); 1267 1268 memset(&iwe, 0, sizeof(iwe)); 1269 iwe.cmd = SIOCGIWFREQ; 1270 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1271 iwe.u.freq.e = 0; 1272 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1273 IW_EV_FREQ_LEN); 1274 1275 memset(&iwe, 0, sizeof(iwe)); 1276 iwe.cmd = SIOCGIWFREQ; 1277 iwe.u.freq.m = bss->pub.channel->center_freq; 1278 iwe.u.freq.e = 6; 1279 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1280 IW_EV_FREQ_LEN); 1281 1282 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1283 memset(&iwe, 0, sizeof(iwe)); 1284 iwe.cmd = IWEVQUAL; 1285 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1286 IW_QUAL_NOISE_INVALID | 1287 IW_QUAL_QUAL_UPDATED; 1288 switch (wiphy->signal_type) { 1289 case CFG80211_SIGNAL_TYPE_MBM: 1290 sig = bss->pub.signal / 100; 1291 iwe.u.qual.level = sig; 1292 iwe.u.qual.updated |= IW_QUAL_DBM; 1293 if (sig < -110) /* rather bad */ 1294 sig = -110; 1295 else if (sig > -40) /* perfect */ 1296 sig = -40; 1297 /* will give a range of 0 .. 70 */ 1298 iwe.u.qual.qual = sig + 110; 1299 break; 1300 case CFG80211_SIGNAL_TYPE_UNSPEC: 1301 iwe.u.qual.level = bss->pub.signal; 1302 /* will give range 0 .. 100 */ 1303 iwe.u.qual.qual = bss->pub.signal; 1304 break; 1305 default: 1306 /* not reached */ 1307 break; 1308 } 1309 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1310 &iwe, IW_EV_QUAL_LEN); 1311 } 1312 1313 memset(&iwe, 0, sizeof(iwe)); 1314 iwe.cmd = SIOCGIWENCODE; 1315 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1316 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1317 else 1318 iwe.u.data.flags = IW_ENCODE_DISABLED; 1319 iwe.u.data.length = 0; 1320 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1321 &iwe, ""); 1322 1323 rcu_read_lock(); 1324 ies = rcu_dereference(bss->pub.ies); 1325 rem = ies->len; 1326 ie = ies->data; 1327 1328 while (rem >= 2) { 1329 /* invalid data */ 1330 if (ie[1] > rem - 2) 1331 break; 1332 1333 switch (ie[0]) { 1334 case WLAN_EID_SSID: 1335 memset(&iwe, 0, sizeof(iwe)); 1336 iwe.cmd = SIOCGIWESSID; 1337 iwe.u.data.length = ie[1]; 1338 iwe.u.data.flags = 1; 1339 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1340 &iwe, (u8 *)ie + 2); 1341 break; 1342 case WLAN_EID_MESH_ID: 1343 memset(&iwe, 0, sizeof(iwe)); 1344 iwe.cmd = SIOCGIWESSID; 1345 iwe.u.data.length = ie[1]; 1346 iwe.u.data.flags = 1; 1347 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1348 &iwe, (u8 *)ie + 2); 1349 break; 1350 case WLAN_EID_MESH_CONFIG: 1351 ismesh = true; 1352 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1353 break; 1354 buf = kmalloc(50, GFP_ATOMIC); 1355 if (!buf) 1356 break; 1357 cfg = (u8 *)ie + 2; 1358 memset(&iwe, 0, sizeof(iwe)); 1359 iwe.cmd = IWEVCUSTOM; 1360 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1361 "0x%02X", cfg[0]); 1362 iwe.u.data.length = strlen(buf); 1363 current_ev = iwe_stream_add_point(info, current_ev, 1364 end_buf, 1365 &iwe, buf); 1366 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1367 cfg[1]); 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, "Congestion Control Mode ID: 0x%02X", 1373 cfg[2]); 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, "Synchronization ID: 0x%02X", cfg[3]); 1379 iwe.u.data.length = strlen(buf); 1380 current_ev = iwe_stream_add_point(info, current_ev, 1381 end_buf, 1382 &iwe, buf); 1383 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1384 iwe.u.data.length = strlen(buf); 1385 current_ev = iwe_stream_add_point(info, current_ev, 1386 end_buf, 1387 &iwe, buf); 1388 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1389 iwe.u.data.length = strlen(buf); 1390 current_ev = iwe_stream_add_point(info, current_ev, 1391 end_buf, 1392 &iwe, buf); 1393 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1394 iwe.u.data.length = strlen(buf); 1395 current_ev = iwe_stream_add_point(info, current_ev, 1396 end_buf, 1397 &iwe, buf); 1398 kfree(buf); 1399 break; 1400 case WLAN_EID_SUPP_RATES: 1401 case WLAN_EID_EXT_SUPP_RATES: 1402 /* display all supported rates in readable format */ 1403 p = current_ev + iwe_stream_lcp_len(info); 1404 1405 memset(&iwe, 0, sizeof(iwe)); 1406 iwe.cmd = SIOCGIWRATE; 1407 /* Those two flags are ignored... */ 1408 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1409 1410 for (i = 0; i < ie[1]; i++) { 1411 iwe.u.bitrate.value = 1412 ((ie[i + 2] & 0x7f) * 500000); 1413 p = iwe_stream_add_value(info, current_ev, p, 1414 end_buf, &iwe, IW_EV_PARAM_LEN); 1415 } 1416 current_ev = p; 1417 break; 1418 } 1419 rem -= ie[1] + 2; 1420 ie += ie[1] + 2; 1421 } 1422 1423 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1424 ismesh) { 1425 memset(&iwe, 0, sizeof(iwe)); 1426 iwe.cmd = SIOCGIWMODE; 1427 if (ismesh) 1428 iwe.u.mode = IW_MODE_MESH; 1429 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1430 iwe.u.mode = IW_MODE_MASTER; 1431 else 1432 iwe.u.mode = IW_MODE_ADHOC; 1433 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1434 &iwe, IW_EV_UINT_LEN); 1435 } 1436 1437 buf = kmalloc(31, GFP_ATOMIC); 1438 if (buf) { 1439 memset(&iwe, 0, sizeof(iwe)); 1440 iwe.cmd = IWEVCUSTOM; 1441 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); 1442 iwe.u.data.length = strlen(buf); 1443 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1444 &iwe, buf); 1445 memset(&iwe, 0, sizeof(iwe)); 1446 iwe.cmd = IWEVCUSTOM; 1447 sprintf(buf, " Last beacon: %ums ago", 1448 elapsed_jiffies_msecs(bss->ts)); 1449 iwe.u.data.length = strlen(buf); 1450 current_ev = iwe_stream_add_point(info, current_ev, 1451 end_buf, &iwe, buf); 1452 kfree(buf); 1453 } 1454 1455 ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); 1456 rcu_read_unlock(); 1457 1458 return current_ev; 1459 } 1460 1461 1462 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1463 struct iw_request_info *info, 1464 char *buf, size_t len) 1465 { 1466 char *current_ev = buf; 1467 char *end_buf = buf + len; 1468 struct cfg80211_internal_bss *bss; 1469 1470 spin_lock_bh(&dev->bss_lock); 1471 cfg80211_bss_expire(dev); 1472 1473 list_for_each_entry(bss, &dev->bss_list, list) { 1474 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1475 spin_unlock_bh(&dev->bss_lock); 1476 return -E2BIG; 1477 } 1478 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1479 current_ev, end_buf); 1480 } 1481 spin_unlock_bh(&dev->bss_lock); 1482 return current_ev - buf; 1483 } 1484 1485 1486 int cfg80211_wext_giwscan(struct net_device *dev, 1487 struct iw_request_info *info, 1488 struct iw_point *data, char *extra) 1489 { 1490 struct cfg80211_registered_device *rdev; 1491 int res; 1492 1493 if (!netif_running(dev)) 1494 return -ENETDOWN; 1495 1496 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1497 1498 if (IS_ERR(rdev)) 1499 return PTR_ERR(rdev); 1500 1501 if (rdev->scan_req || rdev->scan_msg) 1502 return -EAGAIN; 1503 1504 res = ieee80211_scan_results(rdev, info, extra, data->length); 1505 data->length = 0; 1506 if (res >= 0) { 1507 data->length = res; 1508 res = 0; 1509 } 1510 1511 return res; 1512 } 1513 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1514 #endif 1515