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, bool leak) 165 { 166 struct cfg80211_scan_request *request; 167 struct wireless_dev *wdev; 168 #ifdef CONFIG_CFG80211_WEXT 169 union iwreq_data wrqu; 170 #endif 171 172 ASSERT_RTNL(); 173 174 request = rdev->scan_req; 175 176 if (!request) 177 return; 178 179 wdev = request->wdev; 180 181 /* 182 * This must be before sending the other events! 183 * Otherwise, wpa_supplicant gets completely confused with 184 * wext events. 185 */ 186 if (wdev->netdev) 187 cfg80211_sme_scan_done(wdev->netdev); 188 189 if (request->aborted) { 190 nl80211_send_scan_aborted(rdev, wdev); 191 } else { 192 if (request->flags & NL80211_SCAN_FLAG_FLUSH) { 193 /* flush entries from previous scans */ 194 spin_lock_bh(&rdev->bss_lock); 195 __cfg80211_bss_expire(rdev, request->scan_start); 196 spin_unlock_bh(&rdev->bss_lock); 197 } 198 nl80211_send_scan_done(rdev, wdev); 199 } 200 201 #ifdef CONFIG_CFG80211_WEXT 202 if (wdev->netdev && !request->aborted) { 203 memset(&wrqu, 0, sizeof(wrqu)); 204 205 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); 206 } 207 #endif 208 209 if (wdev->netdev) 210 dev_put(wdev->netdev); 211 212 rdev->scan_req = NULL; 213 214 /* 215 * OK. If this is invoked with "leak" then we can't 216 * free this ... but we've cleaned it up anyway. The 217 * driver failed to call the scan_done callback, so 218 * all bets are off, it might still be trying to use 219 * the scan request or not ... if it accesses the dev 220 * in there (it shouldn't anyway) then it may crash. 221 */ 222 if (!leak) 223 kfree(request); 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, false); 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 /* that would be odd ... */ 663 if (bss->pub.beacon_ies) 664 continue; 665 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 666 continue; 667 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 668 list_del(&bss->hidden_list); 669 /* combine them */ 670 list_add(&bss->hidden_list, &new->hidden_list); 671 bss->pub.hidden_beacon_bss = &new->pub; 672 new->refcount += bss->refcount; 673 rcu_assign_pointer(bss->pub.beacon_ies, 674 new->pub.beacon_ies); 675 } 676 677 return true; 678 } 679 680 /* Returned bss is reference counted and must be cleaned up appropriately. */ 681 static struct cfg80211_internal_bss * 682 cfg80211_bss_update(struct cfg80211_registered_device *dev, 683 struct cfg80211_internal_bss *tmp) 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 found->pub.signal = tmp->pub.signal; 769 found->pub.capability = tmp->pub.capability; 770 found->ts = tmp->ts; 771 } else { 772 struct cfg80211_internal_bss *new; 773 struct cfg80211_internal_bss *hidden; 774 struct cfg80211_bss_ies *ies; 775 776 /* 777 * create a copy -- the "res" variable that is passed in 778 * is allocated on the stack since it's not needed in the 779 * more common case of an update 780 */ 781 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, 782 GFP_ATOMIC); 783 if (!new) { 784 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 785 if (ies) 786 kfree_rcu(ies, rcu_head); 787 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 788 if (ies) 789 kfree_rcu(ies, rcu_head); 790 goto drop; 791 } 792 memcpy(new, tmp, sizeof(*new)); 793 new->refcount = 1; 794 INIT_LIST_HEAD(&new->hidden_list); 795 796 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 797 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); 798 if (!hidden) 799 hidden = rb_find_bss(dev, tmp, 800 BSS_CMP_HIDE_NUL); 801 if (hidden) { 802 new->pub.hidden_beacon_bss = &hidden->pub; 803 list_add(&new->hidden_list, 804 &hidden->hidden_list); 805 hidden->refcount++; 806 rcu_assign_pointer(new->pub.beacon_ies, 807 hidden->pub.beacon_ies); 808 } 809 } else { 810 /* 811 * Ok so we found a beacon, and don't have an entry. If 812 * it's a beacon with hidden SSID, we might be in for an 813 * expensive search for any probe responses that should 814 * be grouped with this beacon for updates ... 815 */ 816 if (!cfg80211_combine_bsses(dev, new)) { 817 kfree(new); 818 goto drop; 819 } 820 } 821 822 list_add_tail(&new->list, &dev->bss_list); 823 rb_insert_bss(dev, new); 824 found = new; 825 } 826 827 dev->bss_generation++; 828 bss_ref_get(dev, found); 829 spin_unlock_bh(&dev->bss_lock); 830 831 return found; 832 drop: 833 spin_unlock_bh(&dev->bss_lock); 834 return NULL; 835 } 836 837 static struct ieee80211_channel * 838 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 839 struct ieee80211_channel *channel) 840 { 841 const u8 *tmp; 842 u32 freq; 843 int channel_number = -1; 844 845 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); 846 if (tmp && tmp[1] == 1) { 847 channel_number = tmp[2]; 848 } else { 849 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); 850 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { 851 struct ieee80211_ht_operation *htop = (void *)(tmp + 2); 852 853 channel_number = htop->primary_chan; 854 } 855 } 856 857 if (channel_number < 0) 858 return channel; 859 860 freq = ieee80211_channel_to_frequency(channel_number, channel->band); 861 channel = ieee80211_get_channel(wiphy, freq); 862 if (!channel) 863 return NULL; 864 if (channel->flags & IEEE80211_CHAN_DISABLED) 865 return NULL; 866 return channel; 867 } 868 869 /* Returned bss is reference counted and must be cleaned up appropriately. */ 870 struct cfg80211_bss* 871 cfg80211_inform_bss_width(struct wiphy *wiphy, 872 struct ieee80211_channel *channel, 873 enum nl80211_bss_scan_width scan_width, 874 const u8 *bssid, u64 tsf, u16 capability, 875 u16 beacon_interval, const u8 *ie, size_t ielen, 876 s32 signal, gfp_t gfp) 877 { 878 struct cfg80211_bss_ies *ies; 879 struct cfg80211_internal_bss tmp = {}, *res; 880 881 if (WARN_ON(!wiphy)) 882 return NULL; 883 884 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 885 (signal < 0 || signal > 100))) 886 return NULL; 887 888 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); 889 if (!channel) 890 return NULL; 891 892 memcpy(tmp.pub.bssid, bssid, ETH_ALEN); 893 tmp.pub.channel = channel; 894 tmp.pub.scan_width = scan_width; 895 tmp.pub.signal = signal; 896 tmp.pub.beacon_interval = beacon_interval; 897 tmp.pub.capability = capability; 898 /* 899 * Since we do not know here whether the IEs are from a Beacon or Probe 900 * Response frame, we need to pick one of the options and only use it 901 * with the driver that does not provide the full Beacon/Probe Response 902 * frame. Use Beacon frame pointer to avoid indicating that this should 903 * override the IEs pointer should we have received an earlier 904 * indication of Probe Response data. 905 */ 906 ies = kmalloc(sizeof(*ies) + ielen, gfp); 907 if (!ies) 908 return NULL; 909 ies->len = ielen; 910 ies->tsf = tsf; 911 memcpy(ies->data, ie, ielen); 912 913 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 914 rcu_assign_pointer(tmp.pub.ies, ies); 915 916 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); 917 if (!res) 918 return NULL; 919 920 if (res->pub.capability & WLAN_CAPABILITY_ESS) 921 regulatory_hint_found_beacon(wiphy, channel, gfp); 922 923 trace_cfg80211_return_bss(&res->pub); 924 /* cfg80211_bss_update gives us a referenced result */ 925 return &res->pub; 926 } 927 EXPORT_SYMBOL(cfg80211_inform_bss_width); 928 929 /* Returned bss is reference counted and must be cleaned up appropriately. */ 930 struct cfg80211_bss * 931 cfg80211_inform_bss_width_frame(struct wiphy *wiphy, 932 struct ieee80211_channel *channel, 933 enum nl80211_bss_scan_width scan_width, 934 struct ieee80211_mgmt *mgmt, size_t len, 935 s32 signal, gfp_t gfp) 936 { 937 struct cfg80211_internal_bss tmp = {}, *res; 938 struct cfg80211_bss_ies *ies; 939 size_t ielen = len - offsetof(struct ieee80211_mgmt, 940 u.probe_resp.variable); 941 942 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 943 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 944 945 trace_cfg80211_inform_bss_width_frame(wiphy, channel, scan_width, mgmt, 946 len, signal); 947 948 if (WARN_ON(!mgmt)) 949 return NULL; 950 951 if (WARN_ON(!wiphy)) 952 return NULL; 953 954 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 955 (signal < 0 || signal > 100))) 956 return NULL; 957 958 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 959 return NULL; 960 961 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, 962 ielen, channel); 963 if (!channel) 964 return NULL; 965 966 ies = kmalloc(sizeof(*ies) + ielen, gfp); 967 if (!ies) 968 return NULL; 969 ies->len = ielen; 970 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 971 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); 972 973 if (ieee80211_is_probe_resp(mgmt->frame_control)) 974 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 975 else 976 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 977 rcu_assign_pointer(tmp.pub.ies, ies); 978 979 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); 980 tmp.pub.channel = channel; 981 tmp.pub.scan_width = scan_width; 982 tmp.pub.signal = signal; 983 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 984 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 985 986 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); 987 if (!res) 988 return NULL; 989 990 if (res->pub.capability & WLAN_CAPABILITY_ESS) 991 regulatory_hint_found_beacon(wiphy, channel, gfp); 992 993 trace_cfg80211_return_bss(&res->pub); 994 /* cfg80211_bss_update gives us a referenced result */ 995 return &res->pub; 996 } 997 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame); 998 999 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1000 { 1001 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1002 struct cfg80211_internal_bss *bss; 1003 1004 if (!pub) 1005 return; 1006 1007 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1008 1009 spin_lock_bh(&dev->bss_lock); 1010 bss_ref_get(dev, bss); 1011 spin_unlock_bh(&dev->bss_lock); 1012 } 1013 EXPORT_SYMBOL(cfg80211_ref_bss); 1014 1015 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1016 { 1017 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1018 struct cfg80211_internal_bss *bss; 1019 1020 if (!pub) 1021 return; 1022 1023 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1024 1025 spin_lock_bh(&dev->bss_lock); 1026 bss_ref_put(dev, bss); 1027 spin_unlock_bh(&dev->bss_lock); 1028 } 1029 EXPORT_SYMBOL(cfg80211_put_bss); 1030 1031 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1032 { 1033 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1034 struct cfg80211_internal_bss *bss; 1035 1036 if (WARN_ON(!pub)) 1037 return; 1038 1039 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1040 1041 spin_lock_bh(&dev->bss_lock); 1042 if (!list_empty(&bss->list)) { 1043 if (__cfg80211_unlink_bss(dev, bss)) 1044 dev->bss_generation++; 1045 } 1046 spin_unlock_bh(&dev->bss_lock); 1047 } 1048 EXPORT_SYMBOL(cfg80211_unlink_bss); 1049 1050 #ifdef CONFIG_CFG80211_WEXT 1051 static struct cfg80211_registered_device * 1052 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 1053 { 1054 struct cfg80211_registered_device *rdev; 1055 struct net_device *dev; 1056 1057 ASSERT_RTNL(); 1058 1059 dev = dev_get_by_index(net, ifindex); 1060 if (!dev) 1061 return ERR_PTR(-ENODEV); 1062 if (dev->ieee80211_ptr) 1063 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); 1064 else 1065 rdev = ERR_PTR(-ENODEV); 1066 dev_put(dev); 1067 return rdev; 1068 } 1069 1070 int cfg80211_wext_siwscan(struct net_device *dev, 1071 struct iw_request_info *info, 1072 union iwreq_data *wrqu, char *extra) 1073 { 1074 struct cfg80211_registered_device *rdev; 1075 struct wiphy *wiphy; 1076 struct iw_scan_req *wreq = NULL; 1077 struct cfg80211_scan_request *creq = NULL; 1078 int i, err, n_channels = 0; 1079 enum ieee80211_band band; 1080 1081 if (!netif_running(dev)) 1082 return -ENETDOWN; 1083 1084 if (wrqu->data.length == sizeof(struct iw_scan_req)) 1085 wreq = (struct iw_scan_req *)extra; 1086 1087 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1088 1089 if (IS_ERR(rdev)) 1090 return PTR_ERR(rdev); 1091 1092 if (rdev->scan_req) { 1093 err = -EBUSY; 1094 goto out; 1095 } 1096 1097 wiphy = &rdev->wiphy; 1098 1099 /* Determine number of channels, needed to allocate creq */ 1100 if (wreq && wreq->num_channels) 1101 n_channels = wreq->num_channels; 1102 else { 1103 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 1104 if (wiphy->bands[band]) 1105 n_channels += wiphy->bands[band]->n_channels; 1106 } 1107 1108 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 1109 n_channels * sizeof(void *), 1110 GFP_ATOMIC); 1111 if (!creq) { 1112 err = -ENOMEM; 1113 goto out; 1114 } 1115 1116 creq->wiphy = wiphy; 1117 creq->wdev = dev->ieee80211_ptr; 1118 /* SSIDs come after channels */ 1119 creq->ssids = (void *)&creq->channels[n_channels]; 1120 creq->n_channels = n_channels; 1121 creq->n_ssids = 1; 1122 creq->scan_start = jiffies; 1123 1124 /* translate "Scan on frequencies" request */ 1125 i = 0; 1126 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1127 int j; 1128 1129 if (!wiphy->bands[band]) 1130 continue; 1131 1132 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 1133 /* ignore disabled channels */ 1134 if (wiphy->bands[band]->channels[j].flags & 1135 IEEE80211_CHAN_DISABLED) 1136 continue; 1137 1138 /* If we have a wireless request structure and the 1139 * wireless request specifies frequencies, then search 1140 * for the matching hardware channel. 1141 */ 1142 if (wreq && wreq->num_channels) { 1143 int k; 1144 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 1145 for (k = 0; k < wreq->num_channels; k++) { 1146 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 1147 if (wext_freq == wiphy_freq) 1148 goto wext_freq_found; 1149 } 1150 goto wext_freq_not_found; 1151 } 1152 1153 wext_freq_found: 1154 creq->channels[i] = &wiphy->bands[band]->channels[j]; 1155 i++; 1156 wext_freq_not_found: ; 1157 } 1158 } 1159 /* No channels found? */ 1160 if (!i) { 1161 err = -EINVAL; 1162 goto out; 1163 } 1164 1165 /* Set real number of channels specified in creq->channels[] */ 1166 creq->n_channels = i; 1167 1168 /* translate "Scan for SSID" request */ 1169 if (wreq) { 1170 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1171 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1172 err = -EINVAL; 1173 goto out; 1174 } 1175 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1176 creq->ssids[0].ssid_len = wreq->essid_len; 1177 } 1178 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1179 creq->n_ssids = 0; 1180 } 1181 1182 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1183 if (wiphy->bands[i]) 1184 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1185 1186 rdev->scan_req = creq; 1187 err = rdev_scan(rdev, creq); 1188 if (err) { 1189 rdev->scan_req = NULL; 1190 /* creq will be freed below */ 1191 } else { 1192 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 1193 /* creq now owned by driver */ 1194 creq = NULL; 1195 dev_hold(dev); 1196 } 1197 out: 1198 kfree(creq); 1199 return err; 1200 } 1201 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1202 1203 static void ieee80211_scan_add_ies(struct iw_request_info *info, 1204 const struct cfg80211_bss_ies *ies, 1205 char **current_ev, char *end_buf) 1206 { 1207 const u8 *pos, *end, *next; 1208 struct iw_event iwe; 1209 1210 if (!ies) 1211 return; 1212 1213 /* 1214 * If needed, fragment the IEs buffer (at IE boundaries) into short 1215 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1216 */ 1217 pos = ies->data; 1218 end = pos + ies->len; 1219 1220 while (end - pos > IW_GENERIC_IE_MAX) { 1221 next = pos + 2 + pos[1]; 1222 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1223 next = next + 2 + next[1]; 1224 1225 memset(&iwe, 0, sizeof(iwe)); 1226 iwe.cmd = IWEVGENIE; 1227 iwe.u.data.length = next - pos; 1228 *current_ev = iwe_stream_add_point(info, *current_ev, 1229 end_buf, &iwe, 1230 (void *)pos); 1231 1232 pos = next; 1233 } 1234 1235 if (end > pos) { 1236 memset(&iwe, 0, sizeof(iwe)); 1237 iwe.cmd = IWEVGENIE; 1238 iwe.u.data.length = end - pos; 1239 *current_ev = iwe_stream_add_point(info, *current_ev, 1240 end_buf, &iwe, 1241 (void *)pos); 1242 } 1243 } 1244 1245 static char * 1246 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1247 struct cfg80211_internal_bss *bss, char *current_ev, 1248 char *end_buf) 1249 { 1250 const struct cfg80211_bss_ies *ies; 1251 struct iw_event iwe; 1252 const u8 *ie; 1253 u8 *buf, *cfg, *p; 1254 int rem, i, sig; 1255 bool ismesh = false; 1256 1257 memset(&iwe, 0, sizeof(iwe)); 1258 iwe.cmd = SIOCGIWAP; 1259 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1260 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1261 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1262 IW_EV_ADDR_LEN); 1263 1264 memset(&iwe, 0, sizeof(iwe)); 1265 iwe.cmd = SIOCGIWFREQ; 1266 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1267 iwe.u.freq.e = 0; 1268 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1269 IW_EV_FREQ_LEN); 1270 1271 memset(&iwe, 0, sizeof(iwe)); 1272 iwe.cmd = SIOCGIWFREQ; 1273 iwe.u.freq.m = bss->pub.channel->center_freq; 1274 iwe.u.freq.e = 6; 1275 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1276 IW_EV_FREQ_LEN); 1277 1278 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1279 memset(&iwe, 0, sizeof(iwe)); 1280 iwe.cmd = IWEVQUAL; 1281 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1282 IW_QUAL_NOISE_INVALID | 1283 IW_QUAL_QUAL_UPDATED; 1284 switch (wiphy->signal_type) { 1285 case CFG80211_SIGNAL_TYPE_MBM: 1286 sig = bss->pub.signal / 100; 1287 iwe.u.qual.level = sig; 1288 iwe.u.qual.updated |= IW_QUAL_DBM; 1289 if (sig < -110) /* rather bad */ 1290 sig = -110; 1291 else if (sig > -40) /* perfect */ 1292 sig = -40; 1293 /* will give a range of 0 .. 70 */ 1294 iwe.u.qual.qual = sig + 110; 1295 break; 1296 case CFG80211_SIGNAL_TYPE_UNSPEC: 1297 iwe.u.qual.level = bss->pub.signal; 1298 /* will give range 0 .. 100 */ 1299 iwe.u.qual.qual = bss->pub.signal; 1300 break; 1301 default: 1302 /* not reached */ 1303 break; 1304 } 1305 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1306 &iwe, IW_EV_QUAL_LEN); 1307 } 1308 1309 memset(&iwe, 0, sizeof(iwe)); 1310 iwe.cmd = SIOCGIWENCODE; 1311 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1312 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1313 else 1314 iwe.u.data.flags = IW_ENCODE_DISABLED; 1315 iwe.u.data.length = 0; 1316 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1317 &iwe, ""); 1318 1319 rcu_read_lock(); 1320 ies = rcu_dereference(bss->pub.ies); 1321 rem = ies->len; 1322 ie = ies->data; 1323 1324 while (rem >= 2) { 1325 /* invalid data */ 1326 if (ie[1] > rem - 2) 1327 break; 1328 1329 switch (ie[0]) { 1330 case WLAN_EID_SSID: 1331 memset(&iwe, 0, sizeof(iwe)); 1332 iwe.cmd = SIOCGIWESSID; 1333 iwe.u.data.length = ie[1]; 1334 iwe.u.data.flags = 1; 1335 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1336 &iwe, (u8 *)ie + 2); 1337 break; 1338 case WLAN_EID_MESH_ID: 1339 memset(&iwe, 0, sizeof(iwe)); 1340 iwe.cmd = SIOCGIWESSID; 1341 iwe.u.data.length = ie[1]; 1342 iwe.u.data.flags = 1; 1343 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1344 &iwe, (u8 *)ie + 2); 1345 break; 1346 case WLAN_EID_MESH_CONFIG: 1347 ismesh = true; 1348 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1349 break; 1350 buf = kmalloc(50, GFP_ATOMIC); 1351 if (!buf) 1352 break; 1353 cfg = (u8 *)ie + 2; 1354 memset(&iwe, 0, sizeof(iwe)); 1355 iwe.cmd = IWEVCUSTOM; 1356 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1357 "0x%02X", cfg[0]); 1358 iwe.u.data.length = strlen(buf); 1359 current_ev = iwe_stream_add_point(info, current_ev, 1360 end_buf, 1361 &iwe, buf); 1362 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1363 cfg[1]); 1364 iwe.u.data.length = strlen(buf); 1365 current_ev = iwe_stream_add_point(info, current_ev, 1366 end_buf, 1367 &iwe, buf); 1368 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1369 cfg[2]); 1370 iwe.u.data.length = strlen(buf); 1371 current_ev = iwe_stream_add_point(info, current_ev, 1372 end_buf, 1373 &iwe, buf); 1374 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1375 iwe.u.data.length = strlen(buf); 1376 current_ev = iwe_stream_add_point(info, current_ev, 1377 end_buf, 1378 &iwe, buf); 1379 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 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, "Formation Info: 0x%02X", cfg[5]); 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, "Capabilities: 0x%02X", cfg[6]); 1390 iwe.u.data.length = strlen(buf); 1391 current_ev = iwe_stream_add_point(info, current_ev, 1392 end_buf, 1393 &iwe, buf); 1394 kfree(buf); 1395 break; 1396 case WLAN_EID_SUPP_RATES: 1397 case WLAN_EID_EXT_SUPP_RATES: 1398 /* display all supported rates in readable format */ 1399 p = current_ev + iwe_stream_lcp_len(info); 1400 1401 memset(&iwe, 0, sizeof(iwe)); 1402 iwe.cmd = SIOCGIWRATE; 1403 /* Those two flags are ignored... */ 1404 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1405 1406 for (i = 0; i < ie[1]; i++) { 1407 iwe.u.bitrate.value = 1408 ((ie[i + 2] & 0x7f) * 500000); 1409 p = iwe_stream_add_value(info, current_ev, p, 1410 end_buf, &iwe, IW_EV_PARAM_LEN); 1411 } 1412 current_ev = p; 1413 break; 1414 } 1415 rem -= ie[1] + 2; 1416 ie += ie[1] + 2; 1417 } 1418 1419 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1420 ismesh) { 1421 memset(&iwe, 0, sizeof(iwe)); 1422 iwe.cmd = SIOCGIWMODE; 1423 if (ismesh) 1424 iwe.u.mode = IW_MODE_MESH; 1425 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1426 iwe.u.mode = IW_MODE_MASTER; 1427 else 1428 iwe.u.mode = IW_MODE_ADHOC; 1429 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1430 &iwe, IW_EV_UINT_LEN); 1431 } 1432 1433 buf = kmalloc(31, GFP_ATOMIC); 1434 if (buf) { 1435 memset(&iwe, 0, sizeof(iwe)); 1436 iwe.cmd = IWEVCUSTOM; 1437 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); 1438 iwe.u.data.length = strlen(buf); 1439 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1440 &iwe, buf); 1441 memset(&iwe, 0, sizeof(iwe)); 1442 iwe.cmd = IWEVCUSTOM; 1443 sprintf(buf, " Last beacon: %ums ago", 1444 elapsed_jiffies_msecs(bss->ts)); 1445 iwe.u.data.length = strlen(buf); 1446 current_ev = iwe_stream_add_point(info, current_ev, 1447 end_buf, &iwe, buf); 1448 kfree(buf); 1449 } 1450 1451 ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); 1452 rcu_read_unlock(); 1453 1454 return current_ev; 1455 } 1456 1457 1458 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1459 struct iw_request_info *info, 1460 char *buf, size_t len) 1461 { 1462 char *current_ev = buf; 1463 char *end_buf = buf + len; 1464 struct cfg80211_internal_bss *bss; 1465 1466 spin_lock_bh(&dev->bss_lock); 1467 cfg80211_bss_expire(dev); 1468 1469 list_for_each_entry(bss, &dev->bss_list, list) { 1470 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1471 spin_unlock_bh(&dev->bss_lock); 1472 return -E2BIG; 1473 } 1474 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1475 current_ev, end_buf); 1476 } 1477 spin_unlock_bh(&dev->bss_lock); 1478 return current_ev - buf; 1479 } 1480 1481 1482 int cfg80211_wext_giwscan(struct net_device *dev, 1483 struct iw_request_info *info, 1484 struct iw_point *data, char *extra) 1485 { 1486 struct cfg80211_registered_device *rdev; 1487 int res; 1488 1489 if (!netif_running(dev)) 1490 return -ENETDOWN; 1491 1492 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1493 1494 if (IS_ERR(rdev)) 1495 return PTR_ERR(rdev); 1496 1497 if (rdev->scan_req) 1498 return -EAGAIN; 1499 1500 res = ieee80211_scan_results(rdev, info, extra, data->length); 1501 data->length = 0; 1502 if (res >= 0) { 1503 data->length = res; 1504 res = 0; 1505 } 1506 1507 return res; 1508 } 1509 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1510 #endif 1511