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/iw_handler.h> 16 #include "core.h" 17 #include "nl80211.h" 18 #include "wext-compat.h" 19 20 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) 21 22 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) 23 { 24 struct cfg80211_scan_request *request; 25 struct net_device *dev; 26 #ifdef CONFIG_CFG80211_WEXT 27 union iwreq_data wrqu; 28 #endif 29 30 ASSERT_RDEV_LOCK(rdev); 31 32 request = rdev->scan_req; 33 34 if (!request) 35 return; 36 37 dev = request->dev; 38 39 /* 40 * This must be before sending the other events! 41 * Otherwise, wpa_supplicant gets completely confused with 42 * wext events. 43 */ 44 cfg80211_sme_scan_done(dev); 45 46 if (request->aborted) 47 nl80211_send_scan_aborted(rdev, dev); 48 else 49 nl80211_send_scan_done(rdev, dev); 50 51 #ifdef CONFIG_CFG80211_WEXT 52 if (!request->aborted) { 53 memset(&wrqu, 0, sizeof(wrqu)); 54 55 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); 56 } 57 #endif 58 59 dev_put(dev); 60 61 rdev->scan_req = NULL; 62 63 /* 64 * OK. If this is invoked with "leak" then we can't 65 * free this ... but we've cleaned it up anyway. The 66 * driver failed to call the scan_done callback, so 67 * all bets are off, it might still be trying to use 68 * the scan request or not ... if it accesses the dev 69 * in there (it shouldn't anyway) then it may crash. 70 */ 71 if (!leak) 72 kfree(request); 73 } 74 75 void __cfg80211_scan_done(struct work_struct *wk) 76 { 77 struct cfg80211_registered_device *rdev; 78 79 rdev = container_of(wk, struct cfg80211_registered_device, 80 scan_done_wk); 81 82 cfg80211_lock_rdev(rdev); 83 ___cfg80211_scan_done(rdev, false); 84 cfg80211_unlock_rdev(rdev); 85 } 86 87 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) 88 { 89 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); 90 91 request->aborted = aborted; 92 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); 93 } 94 EXPORT_SYMBOL(cfg80211_scan_done); 95 96 void __cfg80211_sched_scan_results(struct work_struct *wk) 97 { 98 struct cfg80211_registered_device *rdev; 99 100 rdev = container_of(wk, struct cfg80211_registered_device, 101 sched_scan_results_wk); 102 103 mutex_lock(&rdev->sched_scan_mtx); 104 105 /* we don't have sched_scan_req anymore if the scan is stopping */ 106 if (rdev->sched_scan_req) 107 nl80211_send_sched_scan_results(rdev, 108 rdev->sched_scan_req->dev); 109 110 mutex_unlock(&rdev->sched_scan_mtx); 111 } 112 113 void cfg80211_sched_scan_results(struct wiphy *wiphy) 114 { 115 /* ignore if we're not scanning */ 116 if (wiphy_to_dev(wiphy)->sched_scan_req) 117 queue_work(cfg80211_wq, 118 &wiphy_to_dev(wiphy)->sched_scan_results_wk); 119 } 120 EXPORT_SYMBOL(cfg80211_sched_scan_results); 121 122 void cfg80211_sched_scan_stopped(struct wiphy *wiphy) 123 { 124 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 125 126 mutex_lock(&rdev->sched_scan_mtx); 127 __cfg80211_stop_sched_scan(rdev, true); 128 mutex_unlock(&rdev->sched_scan_mtx); 129 } 130 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 131 132 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 133 bool driver_initiated) 134 { 135 int err; 136 struct net_device *dev; 137 138 lockdep_assert_held(&rdev->sched_scan_mtx); 139 140 if (!rdev->sched_scan_req) 141 return 0; 142 143 dev = rdev->sched_scan_req->dev; 144 145 if (!driver_initiated) { 146 err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev); 147 if (err) 148 return err; 149 } 150 151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); 152 153 kfree(rdev->sched_scan_req); 154 rdev->sched_scan_req = NULL; 155 156 return err; 157 } 158 159 static void bss_release(struct kref *ref) 160 { 161 struct cfg80211_internal_bss *bss; 162 163 bss = container_of(ref, struct cfg80211_internal_bss, ref); 164 if (bss->pub.free_priv) 165 bss->pub.free_priv(&bss->pub); 166 167 if (bss->beacon_ies_allocated) 168 kfree(bss->pub.beacon_ies); 169 if (bss->proberesp_ies_allocated) 170 kfree(bss->pub.proberesp_ies); 171 172 BUG_ON(atomic_read(&bss->hold)); 173 174 kfree(bss); 175 } 176 177 /* must hold dev->bss_lock! */ 178 void cfg80211_bss_age(struct cfg80211_registered_device *dev, 179 unsigned long age_secs) 180 { 181 struct cfg80211_internal_bss *bss; 182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 183 184 list_for_each_entry(bss, &dev->bss_list, list) { 185 bss->ts -= age_jiffies; 186 } 187 } 188 189 /* must hold dev->bss_lock! */ 190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, 191 struct cfg80211_internal_bss *bss) 192 { 193 list_del_init(&bss->list); 194 rb_erase(&bss->rbn, &dev->bss_tree); 195 kref_put(&bss->ref, bss_release); 196 } 197 198 /* must hold dev->bss_lock! */ 199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev) 200 { 201 struct cfg80211_internal_bss *bss, *tmp; 202 bool expired = false; 203 204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { 205 if (atomic_read(&bss->hold)) 206 continue; 207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) 208 continue; 209 __cfg80211_unlink_bss(dev, bss); 210 expired = true; 211 } 212 213 if (expired) 214 dev->bss_generation++; 215 } 216 217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) 218 { 219 while (len > 2 && ies[0] != eid) { 220 len -= ies[1] + 2; 221 ies += ies[1] + 2; 222 } 223 if (len < 2) 224 return NULL; 225 if (len < 2 + ies[1]) 226 return NULL; 227 return ies; 228 } 229 EXPORT_SYMBOL(cfg80211_find_ie); 230 231 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) 232 { 233 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); 234 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); 235 int r; 236 237 if (!ie1 && !ie2) 238 return 0; 239 if (!ie1 || !ie2) 240 return -1; 241 242 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); 243 if (r == 0 && ie1[1] != ie2[1]) 244 return ie2[1] - ie1[1]; 245 return r; 246 } 247 248 static bool is_bss(struct cfg80211_bss *a, 249 const u8 *bssid, 250 const u8 *ssid, size_t ssid_len) 251 { 252 const u8 *ssidie; 253 254 if (bssid && compare_ether_addr(a->bssid, bssid)) 255 return false; 256 257 if (!ssid) 258 return true; 259 260 ssidie = cfg80211_find_ie(WLAN_EID_SSID, 261 a->information_elements, 262 a->len_information_elements); 263 if (!ssidie) 264 return false; 265 if (ssidie[1] != ssid_len) 266 return false; 267 return memcmp(ssidie + 2, ssid, ssid_len) == 0; 268 } 269 270 static bool is_mesh_bss(struct cfg80211_bss *a) 271 { 272 const u8 *ie; 273 274 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 275 return false; 276 277 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 278 a->information_elements, 279 a->len_information_elements); 280 if (!ie) 281 return false; 282 283 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 284 a->information_elements, 285 a->len_information_elements); 286 if (!ie) 287 return false; 288 289 return true; 290 } 291 292 static bool is_mesh(struct cfg80211_bss *a, 293 const u8 *meshid, size_t meshidlen, 294 const u8 *meshcfg) 295 { 296 const u8 *ie; 297 298 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 299 return false; 300 301 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 302 a->information_elements, 303 a->len_information_elements); 304 if (!ie) 305 return false; 306 if (ie[1] != meshidlen) 307 return false; 308 if (memcmp(ie + 2, meshid, meshidlen)) 309 return false; 310 311 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 312 a->information_elements, 313 a->len_information_elements); 314 if (!ie) 315 return false; 316 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 317 return false; 318 319 /* 320 * Ignore mesh capability (last two bytes of the IE) when 321 * comparing since that may differ between stations taking 322 * part in the same mesh. 323 */ 324 return memcmp(ie + 2, meshcfg, 325 sizeof(struct ieee80211_meshconf_ie) - 2) == 0; 326 } 327 328 static int cmp_bss(struct cfg80211_bss *a, 329 struct cfg80211_bss *b) 330 { 331 int r; 332 333 if (a->channel != b->channel) 334 return b->channel->center_freq - a->channel->center_freq; 335 336 if (is_mesh_bss(a) && is_mesh_bss(b)) { 337 r = cmp_ies(WLAN_EID_MESH_ID, 338 a->information_elements, 339 a->len_information_elements, 340 b->information_elements, 341 b->len_information_elements); 342 if (r) 343 return r; 344 return cmp_ies(WLAN_EID_MESH_CONFIG, 345 a->information_elements, 346 a->len_information_elements, 347 b->information_elements, 348 b->len_information_elements); 349 } 350 351 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 352 if (r) 353 return r; 354 355 return cmp_ies(WLAN_EID_SSID, 356 a->information_elements, 357 a->len_information_elements, 358 b->information_elements, 359 b->len_information_elements); 360 } 361 362 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 363 struct ieee80211_channel *channel, 364 const u8 *bssid, 365 const u8 *ssid, size_t ssid_len, 366 u16 capa_mask, u16 capa_val) 367 { 368 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 369 struct cfg80211_internal_bss *bss, *res = NULL; 370 unsigned long now = jiffies; 371 372 spin_lock_bh(&dev->bss_lock); 373 374 list_for_each_entry(bss, &dev->bss_list, list) { 375 if ((bss->pub.capability & capa_mask) != capa_val) 376 continue; 377 if (channel && bss->pub.channel != channel) 378 continue; 379 /* Don't get expired BSS structs */ 380 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 381 !atomic_read(&bss->hold)) 382 continue; 383 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 384 res = bss; 385 kref_get(&res->ref); 386 break; 387 } 388 } 389 390 spin_unlock_bh(&dev->bss_lock); 391 if (!res) 392 return NULL; 393 return &res->pub; 394 } 395 EXPORT_SYMBOL(cfg80211_get_bss); 396 397 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 398 struct ieee80211_channel *channel, 399 const u8 *meshid, size_t meshidlen, 400 const u8 *meshcfg) 401 { 402 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 403 struct cfg80211_internal_bss *bss, *res = NULL; 404 405 spin_lock_bh(&dev->bss_lock); 406 407 list_for_each_entry(bss, &dev->bss_list, list) { 408 if (channel && bss->pub.channel != channel) 409 continue; 410 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 411 res = bss; 412 kref_get(&res->ref); 413 break; 414 } 415 } 416 417 spin_unlock_bh(&dev->bss_lock); 418 if (!res) 419 return NULL; 420 return &res->pub; 421 } 422 EXPORT_SYMBOL(cfg80211_get_mesh); 423 424 425 static void rb_insert_bss(struct cfg80211_registered_device *dev, 426 struct cfg80211_internal_bss *bss) 427 { 428 struct rb_node **p = &dev->bss_tree.rb_node; 429 struct rb_node *parent = NULL; 430 struct cfg80211_internal_bss *tbss; 431 int cmp; 432 433 while (*p) { 434 parent = *p; 435 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 436 437 cmp = cmp_bss(&bss->pub, &tbss->pub); 438 439 if (WARN_ON(!cmp)) { 440 /* will sort of leak this BSS */ 441 return; 442 } 443 444 if (cmp < 0) 445 p = &(*p)->rb_left; 446 else 447 p = &(*p)->rb_right; 448 } 449 450 rb_link_node(&bss->rbn, parent, p); 451 rb_insert_color(&bss->rbn, &dev->bss_tree); 452 } 453 454 static struct cfg80211_internal_bss * 455 rb_find_bss(struct cfg80211_registered_device *dev, 456 struct cfg80211_internal_bss *res) 457 { 458 struct rb_node *n = dev->bss_tree.rb_node; 459 struct cfg80211_internal_bss *bss; 460 int r; 461 462 while (n) { 463 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 464 r = cmp_bss(&res->pub, &bss->pub); 465 466 if (r == 0) 467 return bss; 468 else if (r < 0) 469 n = n->rb_left; 470 else 471 n = n->rb_right; 472 } 473 474 return NULL; 475 } 476 477 static struct cfg80211_internal_bss * 478 cfg80211_bss_update(struct cfg80211_registered_device *dev, 479 struct cfg80211_internal_bss *res) 480 { 481 struct cfg80211_internal_bss *found = NULL; 482 483 /* 484 * The reference to "res" is donated to this function. 485 */ 486 487 if (WARN_ON(!res->pub.channel)) { 488 kref_put(&res->ref, bss_release); 489 return NULL; 490 } 491 492 res->ts = jiffies; 493 494 spin_lock_bh(&dev->bss_lock); 495 496 found = rb_find_bss(dev, res); 497 498 if (found) { 499 found->pub.beacon_interval = res->pub.beacon_interval; 500 found->pub.tsf = res->pub.tsf; 501 found->pub.signal = res->pub.signal; 502 found->pub.capability = res->pub.capability; 503 found->ts = res->ts; 504 505 /* Update IEs */ 506 if (res->pub.proberesp_ies) { 507 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 508 size_t ielen = res->pub.len_proberesp_ies; 509 510 if (found->pub.proberesp_ies && 511 !found->proberesp_ies_allocated && 512 ksize(found) >= used + ielen) { 513 memcpy(found->pub.proberesp_ies, 514 res->pub.proberesp_ies, ielen); 515 found->pub.len_proberesp_ies = ielen; 516 } else { 517 u8 *ies = found->pub.proberesp_ies; 518 519 if (found->proberesp_ies_allocated) 520 ies = krealloc(ies, ielen, GFP_ATOMIC); 521 else 522 ies = kmalloc(ielen, GFP_ATOMIC); 523 524 if (ies) { 525 memcpy(ies, res->pub.proberesp_ies, 526 ielen); 527 found->proberesp_ies_allocated = true; 528 found->pub.proberesp_ies = ies; 529 found->pub.len_proberesp_ies = ielen; 530 } 531 } 532 533 /* Override possible earlier Beacon frame IEs */ 534 found->pub.information_elements = 535 found->pub.proberesp_ies; 536 found->pub.len_information_elements = 537 found->pub.len_proberesp_ies; 538 } 539 if (res->pub.beacon_ies) { 540 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 541 size_t ielen = res->pub.len_beacon_ies; 542 bool information_elements_is_beacon_ies = 543 (found->pub.information_elements == 544 found->pub.beacon_ies); 545 546 if (found->pub.beacon_ies && 547 !found->beacon_ies_allocated && 548 ksize(found) >= used + ielen) { 549 memcpy(found->pub.beacon_ies, 550 res->pub.beacon_ies, ielen); 551 found->pub.len_beacon_ies = ielen; 552 } else { 553 u8 *ies = found->pub.beacon_ies; 554 555 if (found->beacon_ies_allocated) 556 ies = krealloc(ies, ielen, GFP_ATOMIC); 557 else 558 ies = kmalloc(ielen, GFP_ATOMIC); 559 560 if (ies) { 561 memcpy(ies, res->pub.beacon_ies, 562 ielen); 563 found->beacon_ies_allocated = true; 564 found->pub.beacon_ies = ies; 565 found->pub.len_beacon_ies = ielen; 566 } 567 } 568 569 /* Override IEs if they were from a beacon before */ 570 if (information_elements_is_beacon_ies) { 571 found->pub.information_elements = 572 found->pub.beacon_ies; 573 found->pub.len_information_elements = 574 found->pub.len_beacon_ies; 575 } 576 } 577 578 kref_put(&res->ref, bss_release); 579 } else { 580 /* this "consumes" the reference */ 581 list_add_tail(&res->list, &dev->bss_list); 582 rb_insert_bss(dev, res); 583 found = res; 584 } 585 586 dev->bss_generation++; 587 spin_unlock_bh(&dev->bss_lock); 588 589 kref_get(&found->ref); 590 return found; 591 } 592 593 struct cfg80211_bss* 594 cfg80211_inform_bss(struct wiphy *wiphy, 595 struct ieee80211_channel *channel, 596 const u8 *bssid, 597 u64 timestamp, u16 capability, u16 beacon_interval, 598 const u8 *ie, size_t ielen, 599 s32 signal, gfp_t gfp) 600 { 601 struct cfg80211_internal_bss *res; 602 size_t privsz; 603 604 if (WARN_ON(!wiphy)) 605 return NULL; 606 607 privsz = wiphy->bss_priv_size; 608 609 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 610 (signal < 0 || signal > 100))) 611 return NULL; 612 613 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 614 if (!res) 615 return NULL; 616 617 memcpy(res->pub.bssid, bssid, ETH_ALEN); 618 res->pub.channel = channel; 619 res->pub.signal = signal; 620 res->pub.tsf = timestamp; 621 res->pub.beacon_interval = beacon_interval; 622 res->pub.capability = capability; 623 /* 624 * Since we do not know here whether the IEs are from a Beacon or Probe 625 * Response frame, we need to pick one of the options and only use it 626 * with the driver that does not provide the full Beacon/Probe Response 627 * frame. Use Beacon frame pointer to avoid indicating that this should 628 * override the information_elements pointer should we have received an 629 * earlier indication of Probe Response data. 630 * 631 * The initial buffer for the IEs is allocated with the BSS entry and 632 * is located after the private area. 633 */ 634 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 635 memcpy(res->pub.beacon_ies, ie, ielen); 636 res->pub.len_beacon_ies = ielen; 637 res->pub.information_elements = res->pub.beacon_ies; 638 res->pub.len_information_elements = res->pub.len_beacon_ies; 639 640 kref_init(&res->ref); 641 642 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 643 if (!res) 644 return NULL; 645 646 if (res->pub.capability & WLAN_CAPABILITY_ESS) 647 regulatory_hint_found_beacon(wiphy, channel, gfp); 648 649 /* cfg80211_bss_update gives us a referenced result */ 650 return &res->pub; 651 } 652 EXPORT_SYMBOL(cfg80211_inform_bss); 653 654 struct cfg80211_bss * 655 cfg80211_inform_bss_frame(struct wiphy *wiphy, 656 struct ieee80211_channel *channel, 657 struct ieee80211_mgmt *mgmt, size_t len, 658 s32 signal, gfp_t gfp) 659 { 660 struct cfg80211_internal_bss *res; 661 size_t ielen = len - offsetof(struct ieee80211_mgmt, 662 u.probe_resp.variable); 663 size_t privsz; 664 665 if (WARN_ON(!mgmt)) 666 return NULL; 667 668 if (WARN_ON(!wiphy)) 669 return NULL; 670 671 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 672 (signal < 0 || signal > 100))) 673 return NULL; 674 675 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 676 return NULL; 677 678 privsz = wiphy->bss_priv_size; 679 680 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 681 if (!res) 682 return NULL; 683 684 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 685 res->pub.channel = channel; 686 res->pub.signal = signal; 687 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 688 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 689 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 690 /* 691 * The initial buffer for the IEs is allocated with the BSS entry and 692 * is located after the private area. 693 */ 694 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 695 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 696 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 697 ielen); 698 res->pub.len_proberesp_ies = ielen; 699 res->pub.information_elements = res->pub.proberesp_ies; 700 res->pub.len_information_elements = res->pub.len_proberesp_ies; 701 } else { 702 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 703 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 704 res->pub.len_beacon_ies = ielen; 705 res->pub.information_elements = res->pub.beacon_ies; 706 res->pub.len_information_elements = res->pub.len_beacon_ies; 707 } 708 709 kref_init(&res->ref); 710 711 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 712 if (!res) 713 return NULL; 714 715 if (res->pub.capability & WLAN_CAPABILITY_ESS) 716 regulatory_hint_found_beacon(wiphy, channel, gfp); 717 718 /* cfg80211_bss_update gives us a referenced result */ 719 return &res->pub; 720 } 721 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 722 723 void cfg80211_put_bss(struct cfg80211_bss *pub) 724 { 725 struct cfg80211_internal_bss *bss; 726 727 if (!pub) 728 return; 729 730 bss = container_of(pub, struct cfg80211_internal_bss, pub); 731 kref_put(&bss->ref, bss_release); 732 } 733 EXPORT_SYMBOL(cfg80211_put_bss); 734 735 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 736 { 737 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 738 struct cfg80211_internal_bss *bss; 739 740 if (WARN_ON(!pub)) 741 return; 742 743 bss = container_of(pub, struct cfg80211_internal_bss, pub); 744 745 spin_lock_bh(&dev->bss_lock); 746 if (!list_empty(&bss->list)) { 747 __cfg80211_unlink_bss(dev, bss); 748 dev->bss_generation++; 749 } 750 spin_unlock_bh(&dev->bss_lock); 751 } 752 EXPORT_SYMBOL(cfg80211_unlink_bss); 753 754 #ifdef CONFIG_CFG80211_WEXT 755 int cfg80211_wext_siwscan(struct net_device *dev, 756 struct iw_request_info *info, 757 union iwreq_data *wrqu, char *extra) 758 { 759 struct cfg80211_registered_device *rdev; 760 struct wiphy *wiphy; 761 struct iw_scan_req *wreq = NULL; 762 struct cfg80211_scan_request *creq = NULL; 763 int i, err, n_channels = 0; 764 enum ieee80211_band band; 765 766 if (!netif_running(dev)) 767 return -ENETDOWN; 768 769 if (wrqu->data.length == sizeof(struct iw_scan_req)) 770 wreq = (struct iw_scan_req *)extra; 771 772 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 773 774 if (IS_ERR(rdev)) 775 return PTR_ERR(rdev); 776 777 if (rdev->scan_req) { 778 err = -EBUSY; 779 goto out; 780 } 781 782 wiphy = &rdev->wiphy; 783 784 /* Determine number of channels, needed to allocate creq */ 785 if (wreq && wreq->num_channels) 786 n_channels = wreq->num_channels; 787 else { 788 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 789 if (wiphy->bands[band]) 790 n_channels += wiphy->bands[band]->n_channels; 791 } 792 793 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 794 n_channels * sizeof(void *), 795 GFP_ATOMIC); 796 if (!creq) { 797 err = -ENOMEM; 798 goto out; 799 } 800 801 creq->wiphy = wiphy; 802 creq->dev = dev; 803 /* SSIDs come after channels */ 804 creq->ssids = (void *)&creq->channels[n_channels]; 805 creq->n_channels = n_channels; 806 creq->n_ssids = 1; 807 808 /* translate "Scan on frequencies" request */ 809 i = 0; 810 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 811 int j; 812 813 if (!wiphy->bands[band]) 814 continue; 815 816 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 817 /* ignore disabled channels */ 818 if (wiphy->bands[band]->channels[j].flags & 819 IEEE80211_CHAN_DISABLED) 820 continue; 821 822 /* If we have a wireless request structure and the 823 * wireless request specifies frequencies, then search 824 * for the matching hardware channel. 825 */ 826 if (wreq && wreq->num_channels) { 827 int k; 828 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 829 for (k = 0; k < wreq->num_channels; k++) { 830 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 831 if (wext_freq == wiphy_freq) 832 goto wext_freq_found; 833 } 834 goto wext_freq_not_found; 835 } 836 837 wext_freq_found: 838 creq->channels[i] = &wiphy->bands[band]->channels[j]; 839 i++; 840 wext_freq_not_found: ; 841 } 842 } 843 /* No channels found? */ 844 if (!i) { 845 err = -EINVAL; 846 goto out; 847 } 848 849 /* Set real number of channels specified in creq->channels[] */ 850 creq->n_channels = i; 851 852 /* translate "Scan for SSID" request */ 853 if (wreq) { 854 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 855 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 856 err = -EINVAL; 857 goto out; 858 } 859 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 860 creq->ssids[0].ssid_len = wreq->essid_len; 861 } 862 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 863 creq->n_ssids = 0; 864 } 865 866 rdev->scan_req = creq; 867 err = rdev->ops->scan(wiphy, dev, creq); 868 if (err) { 869 rdev->scan_req = NULL; 870 /* creq will be freed below */ 871 } else { 872 nl80211_send_scan_start(rdev, dev); 873 /* creq now owned by driver */ 874 creq = NULL; 875 dev_hold(dev); 876 } 877 out: 878 kfree(creq); 879 cfg80211_unlock_rdev(rdev); 880 return err; 881 } 882 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 883 884 static void ieee80211_scan_add_ies(struct iw_request_info *info, 885 struct cfg80211_bss *bss, 886 char **current_ev, char *end_buf) 887 { 888 u8 *pos, *end, *next; 889 struct iw_event iwe; 890 891 if (!bss->information_elements || 892 !bss->len_information_elements) 893 return; 894 895 /* 896 * If needed, fragment the IEs buffer (at IE boundaries) into short 897 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 898 */ 899 pos = bss->information_elements; 900 end = pos + bss->len_information_elements; 901 902 while (end - pos > IW_GENERIC_IE_MAX) { 903 next = pos + 2 + pos[1]; 904 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 905 next = next + 2 + next[1]; 906 907 memset(&iwe, 0, sizeof(iwe)); 908 iwe.cmd = IWEVGENIE; 909 iwe.u.data.length = next - pos; 910 *current_ev = iwe_stream_add_point(info, *current_ev, 911 end_buf, &iwe, pos); 912 913 pos = next; 914 } 915 916 if (end > pos) { 917 memset(&iwe, 0, sizeof(iwe)); 918 iwe.cmd = IWEVGENIE; 919 iwe.u.data.length = end - pos; 920 *current_ev = iwe_stream_add_point(info, *current_ev, 921 end_buf, &iwe, pos); 922 } 923 } 924 925 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 926 { 927 unsigned long end = jiffies; 928 929 if (end >= start) 930 return jiffies_to_msecs(end - start); 931 932 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 933 } 934 935 static char * 936 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 937 struct cfg80211_internal_bss *bss, char *current_ev, 938 char *end_buf) 939 { 940 struct iw_event iwe; 941 u8 *buf, *cfg, *p; 942 u8 *ie = bss->pub.information_elements; 943 int rem = bss->pub.len_information_elements, i, sig; 944 bool ismesh = false; 945 946 memset(&iwe, 0, sizeof(iwe)); 947 iwe.cmd = SIOCGIWAP; 948 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 949 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 950 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 951 IW_EV_ADDR_LEN); 952 953 memset(&iwe, 0, sizeof(iwe)); 954 iwe.cmd = SIOCGIWFREQ; 955 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 956 iwe.u.freq.e = 0; 957 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 958 IW_EV_FREQ_LEN); 959 960 memset(&iwe, 0, sizeof(iwe)); 961 iwe.cmd = SIOCGIWFREQ; 962 iwe.u.freq.m = bss->pub.channel->center_freq; 963 iwe.u.freq.e = 6; 964 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 965 IW_EV_FREQ_LEN); 966 967 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 968 memset(&iwe, 0, sizeof(iwe)); 969 iwe.cmd = IWEVQUAL; 970 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 971 IW_QUAL_NOISE_INVALID | 972 IW_QUAL_QUAL_UPDATED; 973 switch (wiphy->signal_type) { 974 case CFG80211_SIGNAL_TYPE_MBM: 975 sig = bss->pub.signal / 100; 976 iwe.u.qual.level = sig; 977 iwe.u.qual.updated |= IW_QUAL_DBM; 978 if (sig < -110) /* rather bad */ 979 sig = -110; 980 else if (sig > -40) /* perfect */ 981 sig = -40; 982 /* will give a range of 0 .. 70 */ 983 iwe.u.qual.qual = sig + 110; 984 break; 985 case CFG80211_SIGNAL_TYPE_UNSPEC: 986 iwe.u.qual.level = bss->pub.signal; 987 /* will give range 0 .. 100 */ 988 iwe.u.qual.qual = bss->pub.signal; 989 break; 990 default: 991 /* not reached */ 992 break; 993 } 994 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 995 &iwe, IW_EV_QUAL_LEN); 996 } 997 998 memset(&iwe, 0, sizeof(iwe)); 999 iwe.cmd = SIOCGIWENCODE; 1000 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 1001 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 1002 else 1003 iwe.u.data.flags = IW_ENCODE_DISABLED; 1004 iwe.u.data.length = 0; 1005 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1006 &iwe, ""); 1007 1008 while (rem >= 2) { 1009 /* invalid data */ 1010 if (ie[1] > rem - 2) 1011 break; 1012 1013 switch (ie[0]) { 1014 case WLAN_EID_SSID: 1015 memset(&iwe, 0, sizeof(iwe)); 1016 iwe.cmd = SIOCGIWESSID; 1017 iwe.u.data.length = ie[1]; 1018 iwe.u.data.flags = 1; 1019 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1020 &iwe, ie + 2); 1021 break; 1022 case WLAN_EID_MESH_ID: 1023 memset(&iwe, 0, sizeof(iwe)); 1024 iwe.cmd = SIOCGIWESSID; 1025 iwe.u.data.length = ie[1]; 1026 iwe.u.data.flags = 1; 1027 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1028 &iwe, ie + 2); 1029 break; 1030 case WLAN_EID_MESH_CONFIG: 1031 ismesh = true; 1032 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1033 break; 1034 buf = kmalloc(50, GFP_ATOMIC); 1035 if (!buf) 1036 break; 1037 cfg = ie + 2; 1038 memset(&iwe, 0, sizeof(iwe)); 1039 iwe.cmd = IWEVCUSTOM; 1040 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1041 "0x%02X", cfg[0]); 1042 iwe.u.data.length = strlen(buf); 1043 current_ev = iwe_stream_add_point(info, current_ev, 1044 end_buf, 1045 &iwe, buf); 1046 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1047 cfg[1]); 1048 iwe.u.data.length = strlen(buf); 1049 current_ev = iwe_stream_add_point(info, current_ev, 1050 end_buf, 1051 &iwe, buf); 1052 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1053 cfg[2]); 1054 iwe.u.data.length = strlen(buf); 1055 current_ev = iwe_stream_add_point(info, current_ev, 1056 end_buf, 1057 &iwe, buf); 1058 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 1059 iwe.u.data.length = strlen(buf); 1060 current_ev = iwe_stream_add_point(info, current_ev, 1061 end_buf, 1062 &iwe, buf); 1063 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); 1064 iwe.u.data.length = strlen(buf); 1065 current_ev = iwe_stream_add_point(info, current_ev, 1066 end_buf, 1067 &iwe, buf); 1068 sprintf(buf, "Formation Info: 0x%02X", cfg[5]); 1069 iwe.u.data.length = strlen(buf); 1070 current_ev = iwe_stream_add_point(info, current_ev, 1071 end_buf, 1072 &iwe, buf); 1073 sprintf(buf, "Capabilities: 0x%02X", cfg[6]); 1074 iwe.u.data.length = strlen(buf); 1075 current_ev = iwe_stream_add_point(info, current_ev, 1076 end_buf, 1077 &iwe, buf); 1078 kfree(buf); 1079 break; 1080 case WLAN_EID_SUPP_RATES: 1081 case WLAN_EID_EXT_SUPP_RATES: 1082 /* display all supported rates in readable format */ 1083 p = current_ev + iwe_stream_lcp_len(info); 1084 1085 memset(&iwe, 0, sizeof(iwe)); 1086 iwe.cmd = SIOCGIWRATE; 1087 /* Those two flags are ignored... */ 1088 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1089 1090 for (i = 0; i < ie[1]; i++) { 1091 iwe.u.bitrate.value = 1092 ((ie[i + 2] & 0x7f) * 500000); 1093 p = iwe_stream_add_value(info, current_ev, p, 1094 end_buf, &iwe, IW_EV_PARAM_LEN); 1095 } 1096 current_ev = p; 1097 break; 1098 } 1099 rem -= ie[1] + 2; 1100 ie += ie[1] + 2; 1101 } 1102 1103 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1104 ismesh) { 1105 memset(&iwe, 0, sizeof(iwe)); 1106 iwe.cmd = SIOCGIWMODE; 1107 if (ismesh) 1108 iwe.u.mode = IW_MODE_MESH; 1109 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1110 iwe.u.mode = IW_MODE_MASTER; 1111 else 1112 iwe.u.mode = IW_MODE_ADHOC; 1113 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1114 &iwe, IW_EV_UINT_LEN); 1115 } 1116 1117 buf = kmalloc(30, GFP_ATOMIC); 1118 if (buf) { 1119 memset(&iwe, 0, sizeof(iwe)); 1120 iwe.cmd = IWEVCUSTOM; 1121 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1122 iwe.u.data.length = strlen(buf); 1123 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1124 &iwe, buf); 1125 memset(&iwe, 0, sizeof(iwe)); 1126 iwe.cmd = IWEVCUSTOM; 1127 sprintf(buf, " Last beacon: %ums ago", 1128 elapsed_jiffies_msecs(bss->ts)); 1129 iwe.u.data.length = strlen(buf); 1130 current_ev = iwe_stream_add_point(info, current_ev, 1131 end_buf, &iwe, buf); 1132 kfree(buf); 1133 } 1134 1135 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1136 1137 return current_ev; 1138 } 1139 1140 1141 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1142 struct iw_request_info *info, 1143 char *buf, size_t len) 1144 { 1145 char *current_ev = buf; 1146 char *end_buf = buf + len; 1147 struct cfg80211_internal_bss *bss; 1148 1149 spin_lock_bh(&dev->bss_lock); 1150 cfg80211_bss_expire(dev); 1151 1152 list_for_each_entry(bss, &dev->bss_list, list) { 1153 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1154 spin_unlock_bh(&dev->bss_lock); 1155 return -E2BIG; 1156 } 1157 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1158 current_ev, end_buf); 1159 } 1160 spin_unlock_bh(&dev->bss_lock); 1161 return current_ev - buf; 1162 } 1163 1164 1165 int cfg80211_wext_giwscan(struct net_device *dev, 1166 struct iw_request_info *info, 1167 struct iw_point *data, char *extra) 1168 { 1169 struct cfg80211_registered_device *rdev; 1170 int res; 1171 1172 if (!netif_running(dev)) 1173 return -ENETDOWN; 1174 1175 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1176 1177 if (IS_ERR(rdev)) 1178 return PTR_ERR(rdev); 1179 1180 if (rdev->scan_req) { 1181 res = -EAGAIN; 1182 goto out; 1183 } 1184 1185 res = ieee80211_scan_results(rdev, info, extra, data->length); 1186 data->length = 0; 1187 if (res >= 0) { 1188 data->length = res; 1189 res = 0; 1190 } 1191 1192 out: 1193 cfg80211_unlock_rdev(rdev); 1194 return res; 1195 } 1196 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1197 #endif 1198