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 lockdep_assert_held(&rdev->sched_scan_mtx); 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 mutex_lock(&rdev->sched_scan_mtx); 234 ___cfg80211_scan_done(rdev, false); 235 mutex_unlock(&rdev->sched_scan_mtx); 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 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); 245 } 246 EXPORT_SYMBOL(cfg80211_scan_done); 247 248 void __cfg80211_sched_scan_results(struct work_struct *wk) 249 { 250 struct cfg80211_registered_device *rdev; 251 struct cfg80211_sched_scan_request *request; 252 253 rdev = container_of(wk, struct cfg80211_registered_device, 254 sched_scan_results_wk); 255 256 request = rdev->sched_scan_req; 257 258 mutex_lock(&rdev->sched_scan_mtx); 259 260 /* we don't have sched_scan_req anymore if the scan is stopping */ 261 if (request) { 262 if (request->flags & NL80211_SCAN_FLAG_FLUSH) { 263 /* flush entries from previous scans */ 264 spin_lock_bh(&rdev->bss_lock); 265 __cfg80211_bss_expire(rdev, request->scan_start); 266 spin_unlock_bh(&rdev->bss_lock); 267 request->scan_start = 268 jiffies + msecs_to_jiffies(request->interval); 269 } 270 nl80211_send_sched_scan_results(rdev, request->dev); 271 } 272 273 mutex_unlock(&rdev->sched_scan_mtx); 274 } 275 276 void cfg80211_sched_scan_results(struct wiphy *wiphy) 277 { 278 trace_cfg80211_sched_scan_results(wiphy); 279 /* ignore if we're not scanning */ 280 if (wiphy_to_dev(wiphy)->sched_scan_req) 281 queue_work(cfg80211_wq, 282 &wiphy_to_dev(wiphy)->sched_scan_results_wk); 283 } 284 EXPORT_SYMBOL(cfg80211_sched_scan_results); 285 286 void cfg80211_sched_scan_stopped(struct wiphy *wiphy) 287 { 288 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 289 290 trace_cfg80211_sched_scan_stopped(wiphy); 291 292 mutex_lock(&rdev->sched_scan_mtx); 293 __cfg80211_stop_sched_scan(rdev, true); 294 mutex_unlock(&rdev->sched_scan_mtx); 295 } 296 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 297 298 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 299 bool driver_initiated) 300 { 301 struct net_device *dev; 302 303 lockdep_assert_held(&rdev->sched_scan_mtx); 304 305 if (!rdev->sched_scan_req) 306 return -ENOENT; 307 308 dev = rdev->sched_scan_req->dev; 309 310 if (!driver_initiated) { 311 int err = rdev_sched_scan_stop(rdev, dev); 312 if (err) 313 return err; 314 } 315 316 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); 317 318 kfree(rdev->sched_scan_req); 319 rdev->sched_scan_req = NULL; 320 321 return 0; 322 } 323 324 void cfg80211_bss_age(struct cfg80211_registered_device *dev, 325 unsigned long age_secs) 326 { 327 struct cfg80211_internal_bss *bss; 328 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 329 330 spin_lock_bh(&dev->bss_lock); 331 list_for_each_entry(bss, &dev->bss_list, list) 332 bss->ts -= age_jiffies; 333 spin_unlock_bh(&dev->bss_lock); 334 } 335 336 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 337 { 338 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 339 } 340 341 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) 342 { 343 while (len > 2 && ies[0] != eid) { 344 len -= ies[1] + 2; 345 ies += ies[1] + 2; 346 } 347 if (len < 2) 348 return NULL; 349 if (len < 2 + ies[1]) 350 return NULL; 351 return ies; 352 } 353 EXPORT_SYMBOL(cfg80211_find_ie); 354 355 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, 356 const u8 *ies, int len) 357 { 358 struct ieee80211_vendor_ie *ie; 359 const u8 *pos = ies, *end = ies + len; 360 int ie_oui; 361 362 while (pos < end) { 363 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, 364 end - pos); 365 if (!pos) 366 return NULL; 367 368 ie = (struct ieee80211_vendor_ie *)pos; 369 370 /* make sure we can access ie->len */ 371 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); 372 373 if (ie->len < sizeof(*ie)) 374 goto cont; 375 376 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; 377 if (ie_oui == oui && ie->oui_type == oui_type) 378 return pos; 379 cont: 380 pos += 2 + ie->len; 381 } 382 return NULL; 383 } 384 EXPORT_SYMBOL(cfg80211_find_vendor_ie); 385 386 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, 387 const u8 *ssid, size_t ssid_len) 388 { 389 const struct cfg80211_bss_ies *ies; 390 const u8 *ssidie; 391 392 if (bssid && !ether_addr_equal(a->bssid, bssid)) 393 return false; 394 395 if (!ssid) 396 return true; 397 398 ies = rcu_access_pointer(a->ies); 399 if (!ies) 400 return false; 401 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 402 if (!ssidie) 403 return false; 404 if (ssidie[1] != ssid_len) 405 return false; 406 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 407 } 408 409 /** 410 * enum bss_compare_mode - BSS compare mode 411 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) 412 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode 413 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode 414 */ 415 enum bss_compare_mode { 416 BSS_CMP_REGULAR, 417 BSS_CMP_HIDE_ZLEN, 418 BSS_CMP_HIDE_NUL, 419 }; 420 421 static int cmp_bss(struct cfg80211_bss *a, 422 struct cfg80211_bss *b, 423 enum bss_compare_mode mode) 424 { 425 const struct cfg80211_bss_ies *a_ies, *b_ies; 426 const u8 *ie1 = NULL; 427 const u8 *ie2 = NULL; 428 int i, r; 429 430 if (a->channel != b->channel) 431 return b->channel->center_freq - a->channel->center_freq; 432 433 a_ies = rcu_access_pointer(a->ies); 434 if (!a_ies) 435 return -1; 436 b_ies = rcu_access_pointer(b->ies); 437 if (!b_ies) 438 return 1; 439 440 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 441 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, 442 a_ies->data, a_ies->len); 443 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) 444 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, 445 b_ies->data, b_ies->len); 446 if (ie1 && ie2) { 447 int mesh_id_cmp; 448 449 if (ie1[1] == ie2[1]) 450 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); 451 else 452 mesh_id_cmp = ie2[1] - ie1[1]; 453 454 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 455 a_ies->data, a_ies->len); 456 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 457 b_ies->data, b_ies->len); 458 if (ie1 && ie2) { 459 if (mesh_id_cmp) 460 return mesh_id_cmp; 461 if (ie1[1] != ie2[1]) 462 return ie2[1] - ie1[1]; 463 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 464 } 465 } 466 467 /* 468 * we can't use compare_ether_addr here since we need a < > operator. 469 * The binary return value of compare_ether_addr isn't enough 470 */ 471 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 472 if (r) 473 return r; 474 475 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); 476 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); 477 478 if (!ie1 && !ie2) 479 return 0; 480 481 /* 482 * Note that with "hide_ssid", the function returns a match if 483 * the already-present BSS ("b") is a hidden SSID beacon for 484 * the new BSS ("a"). 485 */ 486 487 /* sort missing IE before (left of) present IE */ 488 if (!ie1) 489 return -1; 490 if (!ie2) 491 return 1; 492 493 switch (mode) { 494 case BSS_CMP_HIDE_ZLEN: 495 /* 496 * In ZLEN mode we assume the BSS entry we're 497 * looking for has a zero-length SSID. So if 498 * the one we're looking at right now has that, 499 * return 0. Otherwise, return the difference 500 * in length, but since we're looking for the 501 * 0-length it's really equivalent to returning 502 * the length of the one we're looking at. 503 * 504 * No content comparison is needed as we assume 505 * the content length is zero. 506 */ 507 return ie2[1]; 508 case BSS_CMP_REGULAR: 509 default: 510 /* sort by length first, then by contents */ 511 if (ie1[1] != ie2[1]) 512 return ie2[1] - ie1[1]; 513 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 514 case BSS_CMP_HIDE_NUL: 515 if (ie1[1] != ie2[1]) 516 return ie2[1] - ie1[1]; 517 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ 518 for (i = 0; i < ie2[1]; i++) 519 if (ie2[i + 2]) 520 return -1; 521 return 0; 522 } 523 } 524 525 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 526 struct ieee80211_channel *channel, 527 const u8 *bssid, 528 const u8 *ssid, size_t ssid_len, 529 u16 capa_mask, u16 capa_val) 530 { 531 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 532 struct cfg80211_internal_bss *bss, *res = NULL; 533 unsigned long now = jiffies; 534 535 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, 536 capa_val); 537 538 spin_lock_bh(&dev->bss_lock); 539 540 list_for_each_entry(bss, &dev->bss_list, list) { 541 if ((bss->pub.capability & capa_mask) != capa_val) 542 continue; 543 if (channel && bss->pub.channel != channel) 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 } 562 EXPORT_SYMBOL(cfg80211_get_bss); 563 564 static 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 } 592 593 static struct cfg80211_internal_bss * 594 rb_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 } 616 617 static 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 (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 static struct cfg80211_internal_bss * 681 cfg80211_bss_update(struct cfg80211_registered_device *dev, 682 struct cfg80211_internal_bss *tmp) 683 { 684 struct cfg80211_internal_bss *found = NULL; 685 686 if (WARN_ON(!tmp->pub.channel)) 687 return NULL; 688 689 tmp->ts = jiffies; 690 691 spin_lock_bh(&dev->bss_lock); 692 693 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { 694 spin_unlock_bh(&dev->bss_lock); 695 return NULL; 696 } 697 698 found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); 699 700 if (found) { 701 /* Update IEs */ 702 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 703 const struct cfg80211_bss_ies *old; 704 705 old = rcu_access_pointer(found->pub.proberesp_ies); 706 707 rcu_assign_pointer(found->pub.proberesp_ies, 708 tmp->pub.proberesp_ies); 709 /* Override possible earlier Beacon frame IEs */ 710 rcu_assign_pointer(found->pub.ies, 711 tmp->pub.proberesp_ies); 712 if (old) 713 kfree_rcu((struct cfg80211_bss_ies *)old, 714 rcu_head); 715 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { 716 const struct cfg80211_bss_ies *old; 717 struct cfg80211_internal_bss *bss; 718 719 if (found->pub.hidden_beacon_bss && 720 !list_empty(&found->hidden_list)) { 721 const struct cfg80211_bss_ies *f; 722 723 /* 724 * The found BSS struct is one of the probe 725 * response members of a group, but we're 726 * receiving a beacon (beacon_ies in the tmp 727 * bss is used). This can only mean that the 728 * AP changed its beacon from not having an 729 * SSID to showing it, which is confusing so 730 * drop this information. 731 */ 732 733 f = rcu_access_pointer(tmp->pub.beacon_ies); 734 kfree_rcu((struct cfg80211_bss_ies *)f, 735 rcu_head); 736 goto drop; 737 } 738 739 old = rcu_access_pointer(found->pub.beacon_ies); 740 741 rcu_assign_pointer(found->pub.beacon_ies, 742 tmp->pub.beacon_ies); 743 744 /* Override IEs if they were from a beacon before */ 745 if (old == rcu_access_pointer(found->pub.ies)) 746 rcu_assign_pointer(found->pub.ies, 747 tmp->pub.beacon_ies); 748 749 /* Assign beacon IEs to all sub entries */ 750 list_for_each_entry(bss, &found->hidden_list, 751 hidden_list) { 752 const struct cfg80211_bss_ies *ies; 753 754 ies = rcu_access_pointer(bss->pub.beacon_ies); 755 WARN_ON(ies != old); 756 757 rcu_assign_pointer(bss->pub.beacon_ies, 758 tmp->pub.beacon_ies); 759 } 760 761 if (old) 762 kfree_rcu((struct cfg80211_bss_ies *)old, 763 rcu_head); 764 } 765 766 found->pub.beacon_interval = tmp->pub.beacon_interval; 767 found->pub.signal = tmp->pub.signal; 768 found->pub.capability = tmp->pub.capability; 769 found->ts = tmp->ts; 770 } else { 771 struct cfg80211_internal_bss *new; 772 struct cfg80211_internal_bss *hidden; 773 struct cfg80211_bss_ies *ies; 774 775 /* 776 * create a copy -- the "res" variable that is passed in 777 * is allocated on the stack since it's not needed in the 778 * more common case of an update 779 */ 780 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, 781 GFP_ATOMIC); 782 if (!new) { 783 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 784 if (ies) 785 kfree_rcu(ies, rcu_head); 786 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 787 if (ies) 788 kfree_rcu(ies, rcu_head); 789 goto drop; 790 } 791 memcpy(new, tmp, sizeof(*new)); 792 new->refcount = 1; 793 INIT_LIST_HEAD(&new->hidden_list); 794 795 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 796 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); 797 if (!hidden) 798 hidden = rb_find_bss(dev, tmp, 799 BSS_CMP_HIDE_NUL); 800 if (hidden) { 801 new->pub.hidden_beacon_bss = &hidden->pub; 802 list_add(&new->hidden_list, 803 &hidden->hidden_list); 804 hidden->refcount++; 805 rcu_assign_pointer(new->pub.beacon_ies, 806 hidden->pub.beacon_ies); 807 } 808 } else { 809 /* 810 * Ok so we found a beacon, and don't have an entry. If 811 * it's a beacon with hidden SSID, we might be in for an 812 * expensive search for any probe responses that should 813 * be grouped with this beacon for updates ... 814 */ 815 if (!cfg80211_combine_bsses(dev, new)) { 816 kfree(new); 817 goto drop; 818 } 819 } 820 821 list_add_tail(&new->list, &dev->bss_list); 822 rb_insert_bss(dev, new); 823 found = new; 824 } 825 826 dev->bss_generation++; 827 bss_ref_get(dev, found); 828 spin_unlock_bh(&dev->bss_lock); 829 830 return found; 831 drop: 832 spin_unlock_bh(&dev->bss_lock); 833 return NULL; 834 } 835 836 static struct ieee80211_channel * 837 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 838 struct ieee80211_channel *channel) 839 { 840 const u8 *tmp; 841 u32 freq; 842 int channel_number = -1; 843 844 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); 845 if (tmp && tmp[1] == 1) { 846 channel_number = tmp[2]; 847 } else { 848 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); 849 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { 850 struct ieee80211_ht_operation *htop = (void *)(tmp + 2); 851 852 channel_number = htop->primary_chan; 853 } 854 } 855 856 if (channel_number < 0) 857 return channel; 858 859 freq = ieee80211_channel_to_frequency(channel_number, channel->band); 860 channel = ieee80211_get_channel(wiphy, freq); 861 if (!channel) 862 return NULL; 863 if (channel->flags & IEEE80211_CHAN_DISABLED) 864 return NULL; 865 return channel; 866 } 867 868 struct cfg80211_bss* 869 cfg80211_inform_bss(struct wiphy *wiphy, 870 struct ieee80211_channel *channel, 871 const u8 *bssid, u64 tsf, u16 capability, 872 u16 beacon_interval, const u8 *ie, size_t ielen, 873 s32 signal, gfp_t gfp) 874 { 875 struct cfg80211_bss_ies *ies; 876 struct cfg80211_internal_bss tmp = {}, *res; 877 878 if (WARN_ON(!wiphy)) 879 return NULL; 880 881 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 882 (signal < 0 || signal > 100))) 883 return NULL; 884 885 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); 886 if (!channel) 887 return NULL; 888 889 memcpy(tmp.pub.bssid, bssid, ETH_ALEN); 890 tmp.pub.channel = channel; 891 tmp.pub.signal = signal; 892 tmp.pub.beacon_interval = beacon_interval; 893 tmp.pub.capability = capability; 894 /* 895 * Since we do not know here whether the IEs are from a Beacon or Probe 896 * Response frame, we need to pick one of the options and only use it 897 * with the driver that does not provide the full Beacon/Probe Response 898 * frame. Use Beacon frame pointer to avoid indicating that this should 899 * override the IEs pointer should we have received an earlier 900 * indication of Probe Response data. 901 */ 902 ies = kmalloc(sizeof(*ies) + ielen, gfp); 903 if (!ies) 904 return NULL; 905 ies->len = ielen; 906 ies->tsf = tsf; 907 memcpy(ies->data, ie, ielen); 908 909 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 910 rcu_assign_pointer(tmp.pub.ies, ies); 911 912 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); 913 if (!res) 914 return NULL; 915 916 if (res->pub.capability & WLAN_CAPABILITY_ESS) 917 regulatory_hint_found_beacon(wiphy, channel, gfp); 918 919 trace_cfg80211_return_bss(&res->pub); 920 /* cfg80211_bss_update gives us a referenced result */ 921 return &res->pub; 922 } 923 EXPORT_SYMBOL(cfg80211_inform_bss); 924 925 struct cfg80211_bss * 926 cfg80211_inform_bss_frame(struct wiphy *wiphy, 927 struct ieee80211_channel *channel, 928 struct ieee80211_mgmt *mgmt, size_t len, 929 s32 signal, gfp_t gfp) 930 { 931 struct cfg80211_internal_bss tmp = {}, *res; 932 struct cfg80211_bss_ies *ies; 933 size_t ielen = len - offsetof(struct ieee80211_mgmt, 934 u.probe_resp.variable); 935 936 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 937 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 938 939 trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); 940 941 if (WARN_ON(!mgmt)) 942 return NULL; 943 944 if (WARN_ON(!wiphy)) 945 return NULL; 946 947 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 948 (signal < 0 || signal > 100))) 949 return NULL; 950 951 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 952 return NULL; 953 954 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, 955 ielen, channel); 956 if (!channel) 957 return NULL; 958 959 ies = kmalloc(sizeof(*ies) + ielen, gfp); 960 if (!ies) 961 return NULL; 962 ies->len = ielen; 963 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 964 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); 965 966 if (ieee80211_is_probe_resp(mgmt->frame_control)) 967 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 968 else 969 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 970 rcu_assign_pointer(tmp.pub.ies, ies); 971 972 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); 973 tmp.pub.channel = channel; 974 tmp.pub.signal = signal; 975 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 976 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 977 978 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); 979 if (!res) 980 return NULL; 981 982 if (res->pub.capability & WLAN_CAPABILITY_ESS) 983 regulatory_hint_found_beacon(wiphy, channel, gfp); 984 985 trace_cfg80211_return_bss(&res->pub); 986 /* cfg80211_bss_update gives us a referenced result */ 987 return &res->pub; 988 } 989 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 990 991 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 992 { 993 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 994 struct cfg80211_internal_bss *bss; 995 996 if (!pub) 997 return; 998 999 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1000 1001 spin_lock_bh(&dev->bss_lock); 1002 bss_ref_get(dev, bss); 1003 spin_unlock_bh(&dev->bss_lock); 1004 } 1005 EXPORT_SYMBOL(cfg80211_ref_bss); 1006 1007 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1008 { 1009 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1010 struct cfg80211_internal_bss *bss; 1011 1012 if (!pub) 1013 return; 1014 1015 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1016 1017 spin_lock_bh(&dev->bss_lock); 1018 bss_ref_put(dev, bss); 1019 spin_unlock_bh(&dev->bss_lock); 1020 } 1021 EXPORT_SYMBOL(cfg80211_put_bss); 1022 1023 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 1024 { 1025 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 1026 struct cfg80211_internal_bss *bss; 1027 1028 if (WARN_ON(!pub)) 1029 return; 1030 1031 bss = container_of(pub, struct cfg80211_internal_bss, pub); 1032 1033 spin_lock_bh(&dev->bss_lock); 1034 if (!list_empty(&bss->list)) { 1035 if (__cfg80211_unlink_bss(dev, bss)) 1036 dev->bss_generation++; 1037 } 1038 spin_unlock_bh(&dev->bss_lock); 1039 } 1040 EXPORT_SYMBOL(cfg80211_unlink_bss); 1041 1042 #ifdef CONFIG_CFG80211_WEXT 1043 int cfg80211_wext_siwscan(struct net_device *dev, 1044 struct iw_request_info *info, 1045 union iwreq_data *wrqu, char *extra) 1046 { 1047 struct cfg80211_registered_device *rdev; 1048 struct wiphy *wiphy; 1049 struct iw_scan_req *wreq = NULL; 1050 struct cfg80211_scan_request *creq = NULL; 1051 int i, err, n_channels = 0; 1052 enum ieee80211_band band; 1053 1054 if (!netif_running(dev)) 1055 return -ENETDOWN; 1056 1057 if (wrqu->data.length == sizeof(struct iw_scan_req)) 1058 wreq = (struct iw_scan_req *)extra; 1059 1060 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1061 1062 if (IS_ERR(rdev)) 1063 return PTR_ERR(rdev); 1064 1065 mutex_lock(&rdev->sched_scan_mtx); 1066 if (rdev->scan_req) { 1067 err = -EBUSY; 1068 goto out; 1069 } 1070 1071 wiphy = &rdev->wiphy; 1072 1073 /* Determine number of channels, needed to allocate creq */ 1074 if (wreq && wreq->num_channels) 1075 n_channels = wreq->num_channels; 1076 else { 1077 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 1078 if (wiphy->bands[band]) 1079 n_channels += wiphy->bands[band]->n_channels; 1080 } 1081 1082 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 1083 n_channels * sizeof(void *), 1084 GFP_ATOMIC); 1085 if (!creq) { 1086 err = -ENOMEM; 1087 goto out; 1088 } 1089 1090 creq->wiphy = wiphy; 1091 creq->wdev = dev->ieee80211_ptr; 1092 /* SSIDs come after channels */ 1093 creq->ssids = (void *)&creq->channels[n_channels]; 1094 creq->n_channels = n_channels; 1095 creq->n_ssids = 1; 1096 creq->scan_start = jiffies; 1097 1098 /* translate "Scan on frequencies" request */ 1099 i = 0; 1100 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 1101 int j; 1102 1103 if (!wiphy->bands[band]) 1104 continue; 1105 1106 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 1107 /* ignore disabled channels */ 1108 if (wiphy->bands[band]->channels[j].flags & 1109 IEEE80211_CHAN_DISABLED) 1110 continue; 1111 1112 /* If we have a wireless request structure and the 1113 * wireless request specifies frequencies, then search 1114 * for the matching hardware channel. 1115 */ 1116 if (wreq && wreq->num_channels) { 1117 int k; 1118 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 1119 for (k = 0; k < wreq->num_channels; k++) { 1120 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 1121 if (wext_freq == wiphy_freq) 1122 goto wext_freq_found; 1123 } 1124 goto wext_freq_not_found; 1125 } 1126 1127 wext_freq_found: 1128 creq->channels[i] = &wiphy->bands[band]->channels[j]; 1129 i++; 1130 wext_freq_not_found: ; 1131 } 1132 } 1133 /* No channels found? */ 1134 if (!i) { 1135 err = -EINVAL; 1136 goto out; 1137 } 1138 1139 /* Set real number of channels specified in creq->channels[] */ 1140 creq->n_channels = i; 1141 1142 /* translate "Scan for SSID" request */ 1143 if (wreq) { 1144 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 1145 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 1146 err = -EINVAL; 1147 goto out; 1148 } 1149 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 1150 creq->ssids[0].ssid_len = wreq->essid_len; 1151 } 1152 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 1153 creq->n_ssids = 0; 1154 } 1155 1156 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 1157 if (wiphy->bands[i]) 1158 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 1159 1160 rdev->scan_req = creq; 1161 err = rdev_scan(rdev, creq); 1162 if (err) { 1163 rdev->scan_req = NULL; 1164 /* creq will be freed below */ 1165 } else { 1166 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 1167 /* creq now owned by driver */ 1168 creq = NULL; 1169 dev_hold(dev); 1170 } 1171 out: 1172 mutex_unlock(&rdev->sched_scan_mtx); 1173 kfree(creq); 1174 cfg80211_unlock_rdev(rdev); 1175 return err; 1176 } 1177 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 1178 1179 static void ieee80211_scan_add_ies(struct iw_request_info *info, 1180 const struct cfg80211_bss_ies *ies, 1181 char **current_ev, char *end_buf) 1182 { 1183 const u8 *pos, *end, *next; 1184 struct iw_event iwe; 1185 1186 if (!ies) 1187 return; 1188 1189 /* 1190 * If needed, fragment the IEs buffer (at IE boundaries) into short 1191 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 1192 */ 1193 pos = ies->data; 1194 end = pos + ies->len; 1195 1196 while (end - pos > IW_GENERIC_IE_MAX) { 1197 next = pos + 2 + pos[1]; 1198 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 1199 next = next + 2 + next[1]; 1200 1201 memset(&iwe, 0, sizeof(iwe)); 1202 iwe.cmd = IWEVGENIE; 1203 iwe.u.data.length = next - pos; 1204 *current_ev = iwe_stream_add_point(info, *current_ev, 1205 end_buf, &iwe, 1206 (void *)pos); 1207 1208 pos = next; 1209 } 1210 1211 if (end > pos) { 1212 memset(&iwe, 0, sizeof(iwe)); 1213 iwe.cmd = IWEVGENIE; 1214 iwe.u.data.length = end - pos; 1215 *current_ev = iwe_stream_add_point(info, *current_ev, 1216 end_buf, &iwe, 1217 (void *)pos); 1218 } 1219 } 1220 1221 static char * 1222 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 1223 struct cfg80211_internal_bss *bss, char *current_ev, 1224 char *end_buf) 1225 { 1226 const struct cfg80211_bss_ies *ies; 1227 struct iw_event iwe; 1228 const u8 *ie; 1229 u8 *buf, *cfg, *p; 1230 int rem, i, sig; 1231 bool ismesh = false; 1232 1233 memset(&iwe, 0, sizeof(iwe)); 1234 iwe.cmd = SIOCGIWAP; 1235 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 1236 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 1237 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1238 IW_EV_ADDR_LEN); 1239 1240 memset(&iwe, 0, sizeof(iwe)); 1241 iwe.cmd = SIOCGIWFREQ; 1242 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 1243 iwe.u.freq.e = 0; 1244 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1245 IW_EV_FREQ_LEN); 1246 1247 memset(&iwe, 0, sizeof(iwe)); 1248 iwe.cmd = SIOCGIWFREQ; 1249 iwe.u.freq.m = bss->pub.channel->center_freq; 1250 iwe.u.freq.e = 6; 1251 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 1252 IW_EV_FREQ_LEN); 1253 1254 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 1255 memset(&iwe, 0, sizeof(iwe)); 1256 iwe.cmd = IWEVQUAL; 1257 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 1258 IW_QUAL_NOISE_INVALID | 1259 IW_QUAL_QUAL_UPDATED; 1260 switch (wiphy->signal_type) { 1261 case CFG80211_SIGNAL_TYPE_MBM: 1262 sig = bss->pub.signal / 100; 1263 iwe.u.qual.level = sig; 1264 iwe.u.qual.updated |= IW_QUAL_DBM; 1265 if (sig < -110) /* rather bad */ 1266 sig = -110; 1267 else if (sig > -40) /* perfect */ 1268 sig = -40; 1269 /* will give a range of 0 .. 70 */ 1270 iwe.u.qual.qual = sig + 110; 1271 break; 1272 case CFG80211_SIGNAL_TYPE_UNSPEC: 1273 iwe.u.qual.level = bss->pub.signal; 1274 /* will give range 0 .. 100 */ 1275 iwe.u.qual.qual = bss->pub.signal; 1276 break; 1277 default: 1278 /* not reached */ 1279 break; 1280 } 1281 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1282 &iwe, IW_EV_QUAL_LEN); 1283 } 1284 1285 memset(&iwe, 0, sizeof(iwe)); 1286 iwe.cmd = SIOCGIWENCODE; 1287 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1288 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1289 else 1290 iwe.u.data.flags = IW_ENCODE_DISABLED; 1291 iwe.u.data.length = 0; 1292 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1293 &iwe, ""); 1294 1295 rcu_read_lock(); 1296 ies = rcu_dereference(bss->pub.ies); 1297 rem = ies->len; 1298 ie = ies->data; 1299 1300 while (rem >= 2) { 1301 /* invalid data */ 1302 if (ie[1] > rem - 2) 1303 break; 1304 1305 switch (ie[0]) { 1306 case WLAN_EID_SSID: 1307 memset(&iwe, 0, sizeof(iwe)); 1308 iwe.cmd = SIOCGIWESSID; 1309 iwe.u.data.length = ie[1]; 1310 iwe.u.data.flags = 1; 1311 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1312 &iwe, (u8 *)ie + 2); 1313 break; 1314 case WLAN_EID_MESH_ID: 1315 memset(&iwe, 0, sizeof(iwe)); 1316 iwe.cmd = SIOCGIWESSID; 1317 iwe.u.data.length = ie[1]; 1318 iwe.u.data.flags = 1; 1319 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1320 &iwe, (u8 *)ie + 2); 1321 break; 1322 case WLAN_EID_MESH_CONFIG: 1323 ismesh = true; 1324 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1325 break; 1326 buf = kmalloc(50, GFP_ATOMIC); 1327 if (!buf) 1328 break; 1329 cfg = (u8 *)ie + 2; 1330 memset(&iwe, 0, sizeof(iwe)); 1331 iwe.cmd = IWEVCUSTOM; 1332 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1333 "0x%02X", cfg[0]); 1334 iwe.u.data.length = strlen(buf); 1335 current_ev = iwe_stream_add_point(info, current_ev, 1336 end_buf, 1337 &iwe, buf); 1338 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1339 cfg[1]); 1340 iwe.u.data.length = strlen(buf); 1341 current_ev = iwe_stream_add_point(info, current_ev, 1342 end_buf, 1343 &iwe, buf); 1344 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1345 cfg[2]); 1346 iwe.u.data.length = strlen(buf); 1347 current_ev = iwe_stream_add_point(info, current_ev, 1348 end_buf, 1349 &iwe, buf); 1350 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1351 iwe.u.data.length = strlen(buf); 1352 current_ev = iwe_stream_add_point(info, current_ev, 1353 end_buf, 1354 &iwe, buf); 1355 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1356 iwe.u.data.length = strlen(buf); 1357 current_ev = iwe_stream_add_point(info, current_ev, 1358 end_buf, 1359 &iwe, buf); 1360 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1361 iwe.u.data.length = strlen(buf); 1362 current_ev = iwe_stream_add_point(info, current_ev, 1363 end_buf, 1364 &iwe, buf); 1365 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1366 iwe.u.data.length = strlen(buf); 1367 current_ev = iwe_stream_add_point(info, current_ev, 1368 end_buf, 1369 &iwe, buf); 1370 kfree(buf); 1371 break; 1372 case WLAN_EID_SUPP_RATES: 1373 case WLAN_EID_EXT_SUPP_RATES: 1374 /* display all supported rates in readable format */ 1375 p = current_ev + iwe_stream_lcp_len(info); 1376 1377 memset(&iwe, 0, sizeof(iwe)); 1378 iwe.cmd = SIOCGIWRATE; 1379 /* Those two flags are ignored... */ 1380 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1381 1382 for (i = 0; i < ie[1]; i++) { 1383 iwe.u.bitrate.value = 1384 ((ie[i + 2] & 0x7f) * 500000); 1385 p = iwe_stream_add_value(info, current_ev, p, 1386 end_buf, &iwe, IW_EV_PARAM_LEN); 1387 } 1388 current_ev = p; 1389 break; 1390 } 1391 rem -= ie[1] + 2; 1392 ie += ie[1] + 2; 1393 } 1394 1395 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1396 ismesh) { 1397 memset(&iwe, 0, sizeof(iwe)); 1398 iwe.cmd = SIOCGIWMODE; 1399 if (ismesh) 1400 iwe.u.mode = IW_MODE_MESH; 1401 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1402 iwe.u.mode = IW_MODE_MASTER; 1403 else 1404 iwe.u.mode = IW_MODE_ADHOC; 1405 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1406 &iwe, IW_EV_UINT_LEN); 1407 } 1408 1409 buf = kmalloc(31, GFP_ATOMIC); 1410 if (buf) { 1411 memset(&iwe, 0, sizeof(iwe)); 1412 iwe.cmd = IWEVCUSTOM; 1413 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); 1414 iwe.u.data.length = strlen(buf); 1415 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1416 &iwe, buf); 1417 memset(&iwe, 0, sizeof(iwe)); 1418 iwe.cmd = IWEVCUSTOM; 1419 sprintf(buf, " Last beacon: %ums ago", 1420 elapsed_jiffies_msecs(bss->ts)); 1421 iwe.u.data.length = strlen(buf); 1422 current_ev = iwe_stream_add_point(info, current_ev, 1423 end_buf, &iwe, buf); 1424 kfree(buf); 1425 } 1426 1427 ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); 1428 rcu_read_unlock(); 1429 1430 return current_ev; 1431 } 1432 1433 1434 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1435 struct iw_request_info *info, 1436 char *buf, size_t len) 1437 { 1438 char *current_ev = buf; 1439 char *end_buf = buf + len; 1440 struct cfg80211_internal_bss *bss; 1441 1442 spin_lock_bh(&dev->bss_lock); 1443 cfg80211_bss_expire(dev); 1444 1445 list_for_each_entry(bss, &dev->bss_list, list) { 1446 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1447 spin_unlock_bh(&dev->bss_lock); 1448 return -E2BIG; 1449 } 1450 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1451 current_ev, end_buf); 1452 } 1453 spin_unlock_bh(&dev->bss_lock); 1454 return current_ev - buf; 1455 } 1456 1457 1458 int cfg80211_wext_giwscan(struct net_device *dev, 1459 struct iw_request_info *info, 1460 struct iw_point *data, char *extra) 1461 { 1462 struct cfg80211_registered_device *rdev; 1463 int res; 1464 1465 if (!netif_running(dev)) 1466 return -ENETDOWN; 1467 1468 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1469 1470 if (IS_ERR(rdev)) 1471 return PTR_ERR(rdev); 1472 1473 if (rdev->scan_req) { 1474 res = -EAGAIN; 1475 goto out; 1476 } 1477 1478 res = ieee80211_scan_results(rdev, info, extra, data->length); 1479 data->length = 0; 1480 if (res >= 0) { 1481 data->length = res; 1482 res = 0; 1483 } 1484 1485 out: 1486 cfg80211_unlock_rdev(rdev); 1487 return res; 1488 } 1489 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1490 #endif 1491