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 cfg80211_lock_rdev(rdev); 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 cfg80211_unlock_rdev(rdev); 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 cfg80211_lock_rdev(rdev); 127 __cfg80211_stop_sched_scan(rdev, true); 128 cfg80211_unlock_rdev(rdev); 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 ASSERT_RDEV_LOCK(rdev); 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(struct cfg80211_bss *a, 271 const u8 *meshid, size_t meshidlen, 272 const u8 *meshcfg) 273 { 274 const u8 *ie; 275 276 if (!WLAN_CAPABILITY_IS_MBSS(a->capability)) 277 return false; 278 279 ie = cfg80211_find_ie(WLAN_EID_MESH_ID, 280 a->information_elements, 281 a->len_information_elements); 282 if (!ie) 283 return false; 284 if (ie[1] != meshidlen) 285 return false; 286 if (memcmp(ie + 2, meshid, meshidlen)) 287 return false; 288 289 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 290 a->information_elements, 291 a->len_information_elements); 292 if (!ie) 293 return false; 294 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 295 return false; 296 297 /* 298 * Ignore mesh capability (last two bytes of the IE) when 299 * comparing since that may differ between stations taking 300 * part in the same mesh. 301 */ 302 return memcmp(ie + 2, meshcfg, 303 sizeof(struct ieee80211_meshconf_ie) - 2) == 0; 304 } 305 306 static int cmp_bss(struct cfg80211_bss *a, 307 struct cfg80211_bss *b) 308 { 309 int r; 310 311 if (a->channel != b->channel) 312 return b->channel->center_freq - a->channel->center_freq; 313 314 if (WLAN_CAPABILITY_IS_MBSS(a->capability | b->capability)) { 315 r = cmp_ies(WLAN_EID_MESH_ID, 316 a->information_elements, 317 a->len_information_elements, 318 b->information_elements, 319 b->len_information_elements); 320 if (r) 321 return r; 322 return cmp_ies(WLAN_EID_MESH_CONFIG, 323 a->information_elements, 324 a->len_information_elements, 325 b->information_elements, 326 b->len_information_elements); 327 } 328 329 r = memcmp(a->bssid, b->bssid, ETH_ALEN); 330 if (r) 331 return r; 332 333 return cmp_ies(WLAN_EID_SSID, 334 a->information_elements, 335 a->len_information_elements, 336 b->information_elements, 337 b->len_information_elements); 338 } 339 340 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, 341 struct ieee80211_channel *channel, 342 const u8 *bssid, 343 const u8 *ssid, size_t ssid_len, 344 u16 capa_mask, u16 capa_val) 345 { 346 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 347 struct cfg80211_internal_bss *bss, *res = NULL; 348 unsigned long now = jiffies; 349 350 spin_lock_bh(&dev->bss_lock); 351 352 list_for_each_entry(bss, &dev->bss_list, list) { 353 if ((bss->pub.capability & capa_mask) != capa_val) 354 continue; 355 if (channel && bss->pub.channel != channel) 356 continue; 357 /* Don't get expired BSS structs */ 358 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 359 !atomic_read(&bss->hold)) 360 continue; 361 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 362 res = bss; 363 kref_get(&res->ref); 364 break; 365 } 366 } 367 368 spin_unlock_bh(&dev->bss_lock); 369 if (!res) 370 return NULL; 371 return &res->pub; 372 } 373 EXPORT_SYMBOL(cfg80211_get_bss); 374 375 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, 376 struct ieee80211_channel *channel, 377 const u8 *meshid, size_t meshidlen, 378 const u8 *meshcfg) 379 { 380 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 381 struct cfg80211_internal_bss *bss, *res = NULL; 382 383 spin_lock_bh(&dev->bss_lock); 384 385 list_for_each_entry(bss, &dev->bss_list, list) { 386 if (channel && bss->pub.channel != channel) 387 continue; 388 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { 389 res = bss; 390 kref_get(&res->ref); 391 break; 392 } 393 } 394 395 spin_unlock_bh(&dev->bss_lock); 396 if (!res) 397 return NULL; 398 return &res->pub; 399 } 400 EXPORT_SYMBOL(cfg80211_get_mesh); 401 402 403 static void rb_insert_bss(struct cfg80211_registered_device *dev, 404 struct cfg80211_internal_bss *bss) 405 { 406 struct rb_node **p = &dev->bss_tree.rb_node; 407 struct rb_node *parent = NULL; 408 struct cfg80211_internal_bss *tbss; 409 int cmp; 410 411 while (*p) { 412 parent = *p; 413 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 414 415 cmp = cmp_bss(&bss->pub, &tbss->pub); 416 417 if (WARN_ON(!cmp)) { 418 /* will sort of leak this BSS */ 419 return; 420 } 421 422 if (cmp < 0) 423 p = &(*p)->rb_left; 424 else 425 p = &(*p)->rb_right; 426 } 427 428 rb_link_node(&bss->rbn, parent, p); 429 rb_insert_color(&bss->rbn, &dev->bss_tree); 430 } 431 432 static struct cfg80211_internal_bss * 433 rb_find_bss(struct cfg80211_registered_device *dev, 434 struct cfg80211_internal_bss *res) 435 { 436 struct rb_node *n = dev->bss_tree.rb_node; 437 struct cfg80211_internal_bss *bss; 438 int r; 439 440 while (n) { 441 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 442 r = cmp_bss(&res->pub, &bss->pub); 443 444 if (r == 0) 445 return bss; 446 else if (r < 0) 447 n = n->rb_left; 448 else 449 n = n->rb_right; 450 } 451 452 return NULL; 453 } 454 455 static struct cfg80211_internal_bss * 456 cfg80211_bss_update(struct cfg80211_registered_device *dev, 457 struct cfg80211_internal_bss *res) 458 { 459 struct cfg80211_internal_bss *found = NULL; 460 const u8 *meshid, *meshcfg; 461 462 /* 463 * The reference to "res" is donated to this function. 464 */ 465 466 if (WARN_ON(!res->pub.channel)) { 467 kref_put(&res->ref, bss_release); 468 return NULL; 469 } 470 471 res->ts = jiffies; 472 473 if (WLAN_CAPABILITY_IS_MBSS(res->pub.capability)) { 474 /* must be mesh, verify */ 475 meshid = cfg80211_find_ie(WLAN_EID_MESH_ID, 476 res->pub.information_elements, 477 res->pub.len_information_elements); 478 meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 479 res->pub.information_elements, 480 res->pub.len_information_elements); 481 if (!meshid || !meshcfg || 482 meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { 483 /* bogus mesh */ 484 kref_put(&res->ref, bss_release); 485 return NULL; 486 } 487 } 488 489 spin_lock_bh(&dev->bss_lock); 490 491 found = rb_find_bss(dev, res); 492 493 if (found) { 494 found->pub.beacon_interval = res->pub.beacon_interval; 495 found->pub.tsf = res->pub.tsf; 496 found->pub.signal = res->pub.signal; 497 found->pub.capability = res->pub.capability; 498 found->ts = res->ts; 499 500 /* Update IEs */ 501 if (res->pub.proberesp_ies) { 502 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 503 size_t ielen = res->pub.len_proberesp_ies; 504 505 if (found->pub.proberesp_ies && 506 !found->proberesp_ies_allocated && 507 ksize(found) >= used + ielen) { 508 memcpy(found->pub.proberesp_ies, 509 res->pub.proberesp_ies, ielen); 510 found->pub.len_proberesp_ies = ielen; 511 } else { 512 u8 *ies = found->pub.proberesp_ies; 513 514 if (found->proberesp_ies_allocated) 515 ies = krealloc(ies, ielen, GFP_ATOMIC); 516 else 517 ies = kmalloc(ielen, GFP_ATOMIC); 518 519 if (ies) { 520 memcpy(ies, res->pub.proberesp_ies, 521 ielen); 522 found->proberesp_ies_allocated = true; 523 found->pub.proberesp_ies = ies; 524 found->pub.len_proberesp_ies = ielen; 525 } 526 } 527 528 /* Override possible earlier Beacon frame IEs */ 529 found->pub.information_elements = 530 found->pub.proberesp_ies; 531 found->pub.len_information_elements = 532 found->pub.len_proberesp_ies; 533 } 534 if (res->pub.beacon_ies) { 535 size_t used = dev->wiphy.bss_priv_size + sizeof(*res); 536 size_t ielen = res->pub.len_beacon_ies; 537 bool information_elements_is_beacon_ies = 538 (found->pub.information_elements == 539 found->pub.beacon_ies); 540 541 if (found->pub.beacon_ies && 542 !found->beacon_ies_allocated && 543 ksize(found) >= used + ielen) { 544 memcpy(found->pub.beacon_ies, 545 res->pub.beacon_ies, ielen); 546 found->pub.len_beacon_ies = ielen; 547 } else { 548 u8 *ies = found->pub.beacon_ies; 549 550 if (found->beacon_ies_allocated) 551 ies = krealloc(ies, ielen, GFP_ATOMIC); 552 else 553 ies = kmalloc(ielen, GFP_ATOMIC); 554 555 if (ies) { 556 memcpy(ies, res->pub.beacon_ies, 557 ielen); 558 found->beacon_ies_allocated = true; 559 found->pub.beacon_ies = ies; 560 found->pub.len_beacon_ies = ielen; 561 } 562 } 563 564 /* Override IEs if they were from a beacon before */ 565 if (information_elements_is_beacon_ies) { 566 found->pub.information_elements = 567 found->pub.beacon_ies; 568 found->pub.len_information_elements = 569 found->pub.len_beacon_ies; 570 } 571 } 572 573 kref_put(&res->ref, bss_release); 574 } else { 575 /* this "consumes" the reference */ 576 list_add_tail(&res->list, &dev->bss_list); 577 rb_insert_bss(dev, res); 578 found = res; 579 } 580 581 dev->bss_generation++; 582 spin_unlock_bh(&dev->bss_lock); 583 584 kref_get(&found->ref); 585 return found; 586 } 587 588 struct cfg80211_bss* 589 cfg80211_inform_bss(struct wiphy *wiphy, 590 struct ieee80211_channel *channel, 591 const u8 *bssid, 592 u64 timestamp, u16 capability, u16 beacon_interval, 593 const u8 *ie, size_t ielen, 594 s32 signal, gfp_t gfp) 595 { 596 struct cfg80211_internal_bss *res; 597 size_t privsz; 598 599 if (WARN_ON(!wiphy)) 600 return NULL; 601 602 privsz = wiphy->bss_priv_size; 603 604 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 605 (signal < 0 || signal > 100))) 606 return NULL; 607 608 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 609 if (!res) 610 return NULL; 611 612 memcpy(res->pub.bssid, bssid, ETH_ALEN); 613 res->pub.channel = channel; 614 res->pub.signal = signal; 615 res->pub.tsf = timestamp; 616 res->pub.beacon_interval = beacon_interval; 617 res->pub.capability = capability; 618 /* 619 * Since we do not know here whether the IEs are from a Beacon or Probe 620 * Response frame, we need to pick one of the options and only use it 621 * with the driver that does not provide the full Beacon/Probe Response 622 * frame. Use Beacon frame pointer to avoid indicating that this should 623 * override the information_elements pointer should we have received an 624 * earlier indication of Probe Response data. 625 * 626 * The initial buffer for the IEs is allocated with the BSS entry and 627 * is located after the private area. 628 */ 629 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; 630 memcpy(res->pub.beacon_ies, ie, ielen); 631 res->pub.len_beacon_ies = ielen; 632 res->pub.information_elements = res->pub.beacon_ies; 633 res->pub.len_information_elements = res->pub.len_beacon_ies; 634 635 kref_init(&res->ref); 636 637 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 638 if (!res) 639 return NULL; 640 641 if (res->pub.capability & WLAN_CAPABILITY_ESS) 642 regulatory_hint_found_beacon(wiphy, channel, gfp); 643 644 /* cfg80211_bss_update gives us a referenced result */ 645 return &res->pub; 646 } 647 EXPORT_SYMBOL(cfg80211_inform_bss); 648 649 struct cfg80211_bss * 650 cfg80211_inform_bss_frame(struct wiphy *wiphy, 651 struct ieee80211_channel *channel, 652 struct ieee80211_mgmt *mgmt, size_t len, 653 s32 signal, gfp_t gfp) 654 { 655 struct cfg80211_internal_bss *res; 656 size_t ielen = len - offsetof(struct ieee80211_mgmt, 657 u.probe_resp.variable); 658 size_t privsz; 659 660 if (WARN_ON(!mgmt)) 661 return NULL; 662 663 if (WARN_ON(!wiphy)) 664 return NULL; 665 666 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 667 (signal < 0 || signal > 100))) 668 return NULL; 669 670 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) 671 return NULL; 672 673 privsz = wiphy->bss_priv_size; 674 675 res = kzalloc(sizeof(*res) + privsz + ielen, gfp); 676 if (!res) 677 return NULL; 678 679 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); 680 res->pub.channel = channel; 681 res->pub.signal = signal; 682 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 683 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 684 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 685 /* 686 * The initial buffer for the IEs is allocated with the BSS entry and 687 * is located after the private area. 688 */ 689 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 690 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; 691 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, 692 ielen); 693 res->pub.len_proberesp_ies = ielen; 694 res->pub.information_elements = res->pub.proberesp_ies; 695 res->pub.len_information_elements = res->pub.len_proberesp_ies; 696 } else { 697 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; 698 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); 699 res->pub.len_beacon_ies = ielen; 700 res->pub.information_elements = res->pub.beacon_ies; 701 res->pub.len_information_elements = res->pub.len_beacon_ies; 702 } 703 704 kref_init(&res->ref); 705 706 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); 707 if (!res) 708 return NULL; 709 710 if (res->pub.capability & WLAN_CAPABILITY_ESS) 711 regulatory_hint_found_beacon(wiphy, channel, gfp); 712 713 /* cfg80211_bss_update gives us a referenced result */ 714 return &res->pub; 715 } 716 EXPORT_SYMBOL(cfg80211_inform_bss_frame); 717 718 void cfg80211_put_bss(struct cfg80211_bss *pub) 719 { 720 struct cfg80211_internal_bss *bss; 721 722 if (!pub) 723 return; 724 725 bss = container_of(pub, struct cfg80211_internal_bss, pub); 726 kref_put(&bss->ref, bss_release); 727 } 728 EXPORT_SYMBOL(cfg80211_put_bss); 729 730 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 731 { 732 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); 733 struct cfg80211_internal_bss *bss; 734 735 if (WARN_ON(!pub)) 736 return; 737 738 bss = container_of(pub, struct cfg80211_internal_bss, pub); 739 740 spin_lock_bh(&dev->bss_lock); 741 if (!list_empty(&bss->list)) { 742 __cfg80211_unlink_bss(dev, bss); 743 dev->bss_generation++; 744 } 745 spin_unlock_bh(&dev->bss_lock); 746 } 747 EXPORT_SYMBOL(cfg80211_unlink_bss); 748 749 #ifdef CONFIG_CFG80211_WEXT 750 int cfg80211_wext_siwscan(struct net_device *dev, 751 struct iw_request_info *info, 752 union iwreq_data *wrqu, char *extra) 753 { 754 struct cfg80211_registered_device *rdev; 755 struct wiphy *wiphy; 756 struct iw_scan_req *wreq = NULL; 757 struct cfg80211_scan_request *creq = NULL; 758 int i, err, n_channels = 0; 759 enum ieee80211_band band; 760 761 if (!netif_running(dev)) 762 return -ENETDOWN; 763 764 if (wrqu->data.length == sizeof(struct iw_scan_req)) 765 wreq = (struct iw_scan_req *)extra; 766 767 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 768 769 if (IS_ERR(rdev)) 770 return PTR_ERR(rdev); 771 772 if (rdev->scan_req) { 773 err = -EBUSY; 774 goto out; 775 } 776 777 wiphy = &rdev->wiphy; 778 779 /* Determine number of channels, needed to allocate creq */ 780 if (wreq && wreq->num_channels) 781 n_channels = wreq->num_channels; 782 else { 783 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 784 if (wiphy->bands[band]) 785 n_channels += wiphy->bands[band]->n_channels; 786 } 787 788 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 789 n_channels * sizeof(void *), 790 GFP_ATOMIC); 791 if (!creq) { 792 err = -ENOMEM; 793 goto out; 794 } 795 796 creq->wiphy = wiphy; 797 creq->dev = dev; 798 /* SSIDs come after channels */ 799 creq->ssids = (void *)&creq->channels[n_channels]; 800 creq->n_channels = n_channels; 801 creq->n_ssids = 1; 802 803 /* translate "Scan on frequencies" request */ 804 i = 0; 805 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 806 int j; 807 808 if (!wiphy->bands[band]) 809 continue; 810 811 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 812 /* ignore disabled channels */ 813 if (wiphy->bands[band]->channels[j].flags & 814 IEEE80211_CHAN_DISABLED) 815 continue; 816 817 /* If we have a wireless request structure and the 818 * wireless request specifies frequencies, then search 819 * for the matching hardware channel. 820 */ 821 if (wreq && wreq->num_channels) { 822 int k; 823 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 824 for (k = 0; k < wreq->num_channels; k++) { 825 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); 826 if (wext_freq == wiphy_freq) 827 goto wext_freq_found; 828 } 829 goto wext_freq_not_found; 830 } 831 832 wext_freq_found: 833 creq->channels[i] = &wiphy->bands[band]->channels[j]; 834 i++; 835 wext_freq_not_found: ; 836 } 837 } 838 /* No channels found? */ 839 if (!i) { 840 err = -EINVAL; 841 goto out; 842 } 843 844 /* Set real number of channels specified in creq->channels[] */ 845 creq->n_channels = i; 846 847 /* translate "Scan for SSID" request */ 848 if (wreq) { 849 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 850 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 851 err = -EINVAL; 852 goto out; 853 } 854 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 855 creq->ssids[0].ssid_len = wreq->essid_len; 856 } 857 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 858 creq->n_ssids = 0; 859 } 860 861 rdev->scan_req = creq; 862 err = rdev->ops->scan(wiphy, dev, creq); 863 if (err) { 864 rdev->scan_req = NULL; 865 /* creq will be freed below */ 866 } else { 867 nl80211_send_scan_start(rdev, dev); 868 /* creq now owned by driver */ 869 creq = NULL; 870 dev_hold(dev); 871 } 872 out: 873 kfree(creq); 874 cfg80211_unlock_rdev(rdev); 875 return err; 876 } 877 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); 878 879 static void ieee80211_scan_add_ies(struct iw_request_info *info, 880 struct cfg80211_bss *bss, 881 char **current_ev, char *end_buf) 882 { 883 u8 *pos, *end, *next; 884 struct iw_event iwe; 885 886 if (!bss->information_elements || 887 !bss->len_information_elements) 888 return; 889 890 /* 891 * If needed, fragment the IEs buffer (at IE boundaries) into short 892 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 893 */ 894 pos = bss->information_elements; 895 end = pos + bss->len_information_elements; 896 897 while (end - pos > IW_GENERIC_IE_MAX) { 898 next = pos + 2 + pos[1]; 899 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 900 next = next + 2 + next[1]; 901 902 memset(&iwe, 0, sizeof(iwe)); 903 iwe.cmd = IWEVGENIE; 904 iwe.u.data.length = next - pos; 905 *current_ev = iwe_stream_add_point(info, *current_ev, 906 end_buf, &iwe, pos); 907 908 pos = next; 909 } 910 911 if (end > pos) { 912 memset(&iwe, 0, sizeof(iwe)); 913 iwe.cmd = IWEVGENIE; 914 iwe.u.data.length = end - pos; 915 *current_ev = iwe_stream_add_point(info, *current_ev, 916 end_buf, &iwe, pos); 917 } 918 } 919 920 static inline unsigned int elapsed_jiffies_msecs(unsigned long start) 921 { 922 unsigned long end = jiffies; 923 924 if (end >= start) 925 return jiffies_to_msecs(end - start); 926 927 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); 928 } 929 930 static char * 931 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 932 struct cfg80211_internal_bss *bss, char *current_ev, 933 char *end_buf) 934 { 935 struct iw_event iwe; 936 u8 *buf, *cfg, *p; 937 u8 *ie = bss->pub.information_elements; 938 int rem = bss->pub.len_information_elements, i, sig; 939 bool ismesh = false; 940 941 memset(&iwe, 0, sizeof(iwe)); 942 iwe.cmd = SIOCGIWAP; 943 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 944 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 945 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 946 IW_EV_ADDR_LEN); 947 948 memset(&iwe, 0, sizeof(iwe)); 949 iwe.cmd = SIOCGIWFREQ; 950 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 951 iwe.u.freq.e = 0; 952 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 953 IW_EV_FREQ_LEN); 954 955 memset(&iwe, 0, sizeof(iwe)); 956 iwe.cmd = SIOCGIWFREQ; 957 iwe.u.freq.m = bss->pub.channel->center_freq; 958 iwe.u.freq.e = 6; 959 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, 960 IW_EV_FREQ_LEN); 961 962 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 963 memset(&iwe, 0, sizeof(iwe)); 964 iwe.cmd = IWEVQUAL; 965 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 966 IW_QUAL_NOISE_INVALID | 967 IW_QUAL_QUAL_UPDATED; 968 switch (wiphy->signal_type) { 969 case CFG80211_SIGNAL_TYPE_MBM: 970 sig = bss->pub.signal / 100; 971 iwe.u.qual.level = sig; 972 iwe.u.qual.updated |= IW_QUAL_DBM; 973 if (sig < -110) /* rather bad */ 974 sig = -110; 975 else if (sig > -40) /* perfect */ 976 sig = -40; 977 /* will give a range of 0 .. 70 */ 978 iwe.u.qual.qual = sig + 110; 979 break; 980 case CFG80211_SIGNAL_TYPE_UNSPEC: 981 iwe.u.qual.level = bss->pub.signal; 982 /* will give range 0 .. 100 */ 983 iwe.u.qual.qual = bss->pub.signal; 984 break; 985 default: 986 /* not reached */ 987 break; 988 } 989 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 990 &iwe, IW_EV_QUAL_LEN); 991 } 992 993 memset(&iwe, 0, sizeof(iwe)); 994 iwe.cmd = SIOCGIWENCODE; 995 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 996 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 997 else 998 iwe.u.data.flags = IW_ENCODE_DISABLED; 999 iwe.u.data.length = 0; 1000 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1001 &iwe, ""); 1002 1003 while (rem >= 2) { 1004 /* invalid data */ 1005 if (ie[1] > rem - 2) 1006 break; 1007 1008 switch (ie[0]) { 1009 case WLAN_EID_SSID: 1010 memset(&iwe, 0, sizeof(iwe)); 1011 iwe.cmd = SIOCGIWESSID; 1012 iwe.u.data.length = ie[1]; 1013 iwe.u.data.flags = 1; 1014 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1015 &iwe, ie + 2); 1016 break; 1017 case WLAN_EID_MESH_ID: 1018 memset(&iwe, 0, sizeof(iwe)); 1019 iwe.cmd = SIOCGIWESSID; 1020 iwe.u.data.length = ie[1]; 1021 iwe.u.data.flags = 1; 1022 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1023 &iwe, ie + 2); 1024 break; 1025 case WLAN_EID_MESH_CONFIG: 1026 ismesh = true; 1027 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 1028 break; 1029 buf = kmalloc(50, GFP_ATOMIC); 1030 if (!buf) 1031 break; 1032 cfg = ie + 2; 1033 memset(&iwe, 0, sizeof(iwe)); 1034 iwe.cmd = IWEVCUSTOM; 1035 sprintf(buf, "Mesh Network Path Selection Protocol ID: " 1036 "0x%02X", cfg[0]); 1037 iwe.u.data.length = strlen(buf); 1038 current_ev = iwe_stream_add_point(info, current_ev, 1039 end_buf, 1040 &iwe, buf); 1041 sprintf(buf, "Path Selection Metric ID: 0x%02X", 1042 cfg[1]); 1043 iwe.u.data.length = strlen(buf); 1044 current_ev = iwe_stream_add_point(info, current_ev, 1045 end_buf, 1046 &iwe, buf); 1047 sprintf(buf, "Congestion Control Mode ID: 0x%02X", 1048 cfg[2]); 1049 iwe.u.data.length = strlen(buf); 1050 current_ev = iwe_stream_add_point(info, current_ev, 1051 end_buf, 1052 &iwe, buf); 1053 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); 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, "Authentication ID: 0x%02X", cfg[4]); 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, "Formation Info: 0x%02X", cfg[5]); 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, "Capabilities: 0x%02X", cfg[6]); 1069 iwe.u.data.length = strlen(buf); 1070 current_ev = iwe_stream_add_point(info, current_ev, 1071 end_buf, 1072 &iwe, buf); 1073 kfree(buf); 1074 break; 1075 case WLAN_EID_SUPP_RATES: 1076 case WLAN_EID_EXT_SUPP_RATES: 1077 /* display all supported rates in readable format */ 1078 p = current_ev + iwe_stream_lcp_len(info); 1079 1080 memset(&iwe, 0, sizeof(iwe)); 1081 iwe.cmd = SIOCGIWRATE; 1082 /* Those two flags are ignored... */ 1083 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 1084 1085 for (i = 0; i < ie[1]; i++) { 1086 iwe.u.bitrate.value = 1087 ((ie[i + 2] & 0x7f) * 500000); 1088 p = iwe_stream_add_value(info, current_ev, p, 1089 end_buf, &iwe, IW_EV_PARAM_LEN); 1090 } 1091 current_ev = p; 1092 break; 1093 } 1094 rem -= ie[1] + 2; 1095 ie += ie[1] + 2; 1096 } 1097 1098 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 1099 ismesh) { 1100 memset(&iwe, 0, sizeof(iwe)); 1101 iwe.cmd = SIOCGIWMODE; 1102 if (ismesh) 1103 iwe.u.mode = IW_MODE_MESH; 1104 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 1105 iwe.u.mode = IW_MODE_MASTER; 1106 else 1107 iwe.u.mode = IW_MODE_ADHOC; 1108 current_ev = iwe_stream_add_event(info, current_ev, end_buf, 1109 &iwe, IW_EV_UINT_LEN); 1110 } 1111 1112 buf = kmalloc(30, GFP_ATOMIC); 1113 if (buf) { 1114 memset(&iwe, 0, sizeof(iwe)); 1115 iwe.cmd = IWEVCUSTOM; 1116 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); 1117 iwe.u.data.length = strlen(buf); 1118 current_ev = iwe_stream_add_point(info, current_ev, end_buf, 1119 &iwe, buf); 1120 memset(&iwe, 0, sizeof(iwe)); 1121 iwe.cmd = IWEVCUSTOM; 1122 sprintf(buf, " Last beacon: %ums ago", 1123 elapsed_jiffies_msecs(bss->ts)); 1124 iwe.u.data.length = strlen(buf); 1125 current_ev = iwe_stream_add_point(info, current_ev, 1126 end_buf, &iwe, buf); 1127 kfree(buf); 1128 } 1129 1130 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); 1131 1132 return current_ev; 1133 } 1134 1135 1136 static int ieee80211_scan_results(struct cfg80211_registered_device *dev, 1137 struct iw_request_info *info, 1138 char *buf, size_t len) 1139 { 1140 char *current_ev = buf; 1141 char *end_buf = buf + len; 1142 struct cfg80211_internal_bss *bss; 1143 1144 spin_lock_bh(&dev->bss_lock); 1145 cfg80211_bss_expire(dev); 1146 1147 list_for_each_entry(bss, &dev->bss_list, list) { 1148 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 1149 spin_unlock_bh(&dev->bss_lock); 1150 return -E2BIG; 1151 } 1152 current_ev = ieee80211_bss(&dev->wiphy, info, bss, 1153 current_ev, end_buf); 1154 } 1155 spin_unlock_bh(&dev->bss_lock); 1156 return current_ev - buf; 1157 } 1158 1159 1160 int cfg80211_wext_giwscan(struct net_device *dev, 1161 struct iw_request_info *info, 1162 struct iw_point *data, char *extra) 1163 { 1164 struct cfg80211_registered_device *rdev; 1165 int res; 1166 1167 if (!netif_running(dev)) 1168 return -ENETDOWN; 1169 1170 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 1171 1172 if (IS_ERR(rdev)) 1173 return PTR_ERR(rdev); 1174 1175 if (rdev->scan_req) { 1176 res = -EAGAIN; 1177 goto out; 1178 } 1179 1180 res = ieee80211_scan_results(rdev, info, extra, data->length); 1181 data->length = 0; 1182 if (res >= 0) { 1183 data->length = res; 1184 res = 0; 1185 } 1186 1187 out: 1188 cfg80211_unlock_rdev(rdev); 1189 return res; 1190 } 1191 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); 1192 #endif 1193