Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * cfg80211 scan result handling |
| 3 | * |
| 4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> |
| 5 | */ |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/netdevice.h> |
| 9 | #include <linux/wireless.h> |
| 10 | #include <linux/nl80211.h> |
| 11 | #include <linux/etherdevice.h> |
| 12 | #include <net/arp.h> |
| 13 | #include <net/cfg80211.h> |
| 14 | #include <net/iw_handler.h> |
| 15 | #include "core.h" |
| 16 | #include "nl80211.h" |
| 17 | |
| 18 | #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ) |
| 19 | |
| 20 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
| 21 | { |
| 22 | struct net_device *dev; |
| 23 | #ifdef CONFIG_WIRELESS_EXT |
| 24 | union iwreq_data wrqu; |
| 25 | #endif |
| 26 | |
| 27 | dev = dev_get_by_index(&init_net, request->ifidx); |
| 28 | if (!dev) |
| 29 | goto out; |
| 30 | |
| 31 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 32 | |
| 33 | if (aborted) |
| 34 | nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev); |
| 35 | else |
| 36 | nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev); |
| 37 | |
| 38 | #ifdef CONFIG_WIRELESS_EXT |
| 39 | if (!aborted) { |
| 40 | memset(&wrqu, 0, sizeof(wrqu)); |
| 41 | |
| 42 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); |
| 43 | } |
| 44 | #endif |
| 45 | |
| 46 | dev_put(dev); |
| 47 | |
| 48 | out: |
Christian Lamparter | 9e81ecc | 2009-07-19 05:05:37 +0200 | [diff] [blame] | 49 | wiphy_to_dev(request->wiphy)->scan_req = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 50 | kfree(request); |
| 51 | } |
| 52 | EXPORT_SYMBOL(cfg80211_scan_done); |
| 53 | |
| 54 | static void bss_release(struct kref *ref) |
| 55 | { |
| 56 | struct cfg80211_internal_bss *bss; |
| 57 | |
| 58 | bss = container_of(ref, struct cfg80211_internal_bss, ref); |
Johannes Berg | 78c1c7e | 2009-02-10 21:25:57 +0100 | [diff] [blame] | 59 | if (bss->pub.free_priv) |
| 60 | bss->pub.free_priv(&bss->pub); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 61 | |
| 62 | if (bss->ies_allocated) |
| 63 | kfree(bss->pub.information_elements); |
| 64 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 65 | kfree(bss); |
| 66 | } |
| 67 | |
| 68 | /* must hold dev->bss_lock! */ |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 69 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
| 70 | unsigned long age_secs) |
| 71 | { |
| 72 | struct cfg80211_internal_bss *bss; |
| 73 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); |
| 74 | |
| 75 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 76 | bss->ts -= age_jiffies; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /* must hold dev->bss_lock! */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 81 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
| 82 | { |
| 83 | struct cfg80211_internal_bss *bss, *tmp; |
| 84 | bool expired = false; |
| 85 | |
| 86 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
Kalle Valo | a08c1c1 | 2009-03-22 21:57:28 +0200 | [diff] [blame] | 87 | if (bss->hold || |
| 88 | !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 89 | continue; |
| 90 | list_del(&bss->list); |
| 91 | rb_erase(&bss->rbn, &dev->bss_tree); |
| 92 | kref_put(&bss->ref, bss_release); |
| 93 | expired = true; |
| 94 | } |
| 95 | |
| 96 | if (expired) |
| 97 | dev->bss_generation++; |
| 98 | } |
| 99 | |
| 100 | static u8 *find_ie(u8 num, u8 *ies, size_t len) |
| 101 | { |
| 102 | while (len > 2 && ies[0] != num) { |
| 103 | len -= ies[1] + 2; |
| 104 | ies += ies[1] + 2; |
| 105 | } |
| 106 | if (len < 2) |
| 107 | return NULL; |
| 108 | if (len < 2 + ies[1]) |
| 109 | return NULL; |
| 110 | return ies; |
| 111 | } |
| 112 | |
| 113 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) |
| 114 | { |
| 115 | const u8 *ie1 = find_ie(num, ies1, len1); |
| 116 | const u8 *ie2 = find_ie(num, ies2, len2); |
| 117 | int r; |
| 118 | |
| 119 | if (!ie1 && !ie2) |
| 120 | return 0; |
| 121 | if (!ie1) |
| 122 | return -1; |
| 123 | |
| 124 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); |
| 125 | if (r == 0 && ie1[1] != ie2[1]) |
| 126 | return ie2[1] - ie1[1]; |
| 127 | return r; |
| 128 | } |
| 129 | |
| 130 | static bool is_bss(struct cfg80211_bss *a, |
| 131 | const u8 *bssid, |
| 132 | const u8 *ssid, size_t ssid_len) |
| 133 | { |
| 134 | const u8 *ssidie; |
| 135 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 136 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 137 | return false; |
| 138 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 139 | if (!ssid) |
| 140 | return true; |
| 141 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 142 | ssidie = find_ie(WLAN_EID_SSID, |
| 143 | a->information_elements, |
| 144 | a->len_information_elements); |
| 145 | if (!ssidie) |
| 146 | return false; |
| 147 | if (ssidie[1] != ssid_len) |
| 148 | return false; |
| 149 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; |
| 150 | } |
| 151 | |
| 152 | static bool is_mesh(struct cfg80211_bss *a, |
| 153 | const u8 *meshid, size_t meshidlen, |
| 154 | const u8 *meshcfg) |
| 155 | { |
| 156 | const u8 *ie; |
| 157 | |
| 158 | if (!is_zero_ether_addr(a->bssid)) |
| 159 | return false; |
| 160 | |
| 161 | ie = find_ie(WLAN_EID_MESH_ID, |
| 162 | a->information_elements, |
| 163 | a->len_information_elements); |
| 164 | if (!ie) |
| 165 | return false; |
| 166 | if (ie[1] != meshidlen) |
| 167 | return false; |
| 168 | if (memcmp(ie + 2, meshid, meshidlen)) |
| 169 | return false; |
| 170 | |
| 171 | ie = find_ie(WLAN_EID_MESH_CONFIG, |
| 172 | a->information_elements, |
| 173 | a->len_information_elements); |
| 174 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) |
| 175 | return false; |
| 176 | |
| 177 | /* |
| 178 | * Ignore mesh capability (last two bytes of the IE) when |
| 179 | * comparing since that may differ between stations taking |
| 180 | * part in the same mesh. |
| 181 | */ |
| 182 | return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0; |
| 183 | } |
| 184 | |
| 185 | static int cmp_bss(struct cfg80211_bss *a, |
| 186 | struct cfg80211_bss *b) |
| 187 | { |
| 188 | int r; |
| 189 | |
| 190 | if (a->channel != b->channel) |
| 191 | return b->channel->center_freq - a->channel->center_freq; |
| 192 | |
| 193 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); |
| 194 | if (r) |
| 195 | return r; |
| 196 | |
| 197 | if (is_zero_ether_addr(a->bssid)) { |
| 198 | r = cmp_ies(WLAN_EID_MESH_ID, |
| 199 | a->information_elements, |
| 200 | a->len_information_elements, |
| 201 | b->information_elements, |
| 202 | b->len_information_elements); |
| 203 | if (r) |
| 204 | return r; |
| 205 | return cmp_ies(WLAN_EID_MESH_CONFIG, |
| 206 | a->information_elements, |
| 207 | a->len_information_elements, |
| 208 | b->information_elements, |
| 209 | b->len_information_elements); |
| 210 | } |
| 211 | |
| 212 | return cmp_ies(WLAN_EID_SSID, |
| 213 | a->information_elements, |
| 214 | a->len_information_elements, |
| 215 | b->information_elements, |
| 216 | b->len_information_elements); |
| 217 | } |
| 218 | |
| 219 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
| 220 | struct ieee80211_channel *channel, |
| 221 | const u8 *bssid, |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 222 | const u8 *ssid, size_t ssid_len, |
| 223 | u16 capa_mask, u16 capa_val) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 224 | { |
| 225 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 226 | struct cfg80211_internal_bss *bss, *res = NULL; |
| 227 | |
| 228 | spin_lock_bh(&dev->bss_lock); |
| 229 | |
| 230 | list_for_each_entry(bss, &dev->bss_list, list) { |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 231 | if ((bss->pub.capability & capa_mask) != capa_val) |
| 232 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 233 | if (channel && bss->pub.channel != channel) |
| 234 | continue; |
| 235 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
| 236 | res = bss; |
| 237 | kref_get(&res->ref); |
| 238 | break; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | spin_unlock_bh(&dev->bss_lock); |
| 243 | if (!res) |
| 244 | return NULL; |
| 245 | return &res->pub; |
| 246 | } |
| 247 | EXPORT_SYMBOL(cfg80211_get_bss); |
| 248 | |
| 249 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, |
| 250 | struct ieee80211_channel *channel, |
| 251 | const u8 *meshid, size_t meshidlen, |
| 252 | const u8 *meshcfg) |
| 253 | { |
| 254 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 255 | struct cfg80211_internal_bss *bss, *res = NULL; |
| 256 | |
| 257 | spin_lock_bh(&dev->bss_lock); |
| 258 | |
| 259 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 260 | if (channel && bss->pub.channel != channel) |
| 261 | continue; |
| 262 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { |
| 263 | res = bss; |
| 264 | kref_get(&res->ref); |
| 265 | break; |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | spin_unlock_bh(&dev->bss_lock); |
| 270 | if (!res) |
| 271 | return NULL; |
| 272 | return &res->pub; |
| 273 | } |
| 274 | EXPORT_SYMBOL(cfg80211_get_mesh); |
| 275 | |
| 276 | |
| 277 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
| 278 | struct cfg80211_internal_bss *bss) |
| 279 | { |
| 280 | struct rb_node **p = &dev->bss_tree.rb_node; |
| 281 | struct rb_node *parent = NULL; |
| 282 | struct cfg80211_internal_bss *tbss; |
| 283 | int cmp; |
| 284 | |
| 285 | while (*p) { |
| 286 | parent = *p; |
| 287 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); |
| 288 | |
| 289 | cmp = cmp_bss(&bss->pub, &tbss->pub); |
| 290 | |
| 291 | if (WARN_ON(!cmp)) { |
| 292 | /* will sort of leak this BSS */ |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | if (cmp < 0) |
| 297 | p = &(*p)->rb_left; |
| 298 | else |
| 299 | p = &(*p)->rb_right; |
| 300 | } |
| 301 | |
| 302 | rb_link_node(&bss->rbn, parent, p); |
| 303 | rb_insert_color(&bss->rbn, &dev->bss_tree); |
| 304 | } |
| 305 | |
| 306 | static struct cfg80211_internal_bss * |
| 307 | rb_find_bss(struct cfg80211_registered_device *dev, |
| 308 | struct cfg80211_internal_bss *res) |
| 309 | { |
| 310 | struct rb_node *n = dev->bss_tree.rb_node; |
| 311 | struct cfg80211_internal_bss *bss; |
| 312 | int r; |
| 313 | |
| 314 | while (n) { |
| 315 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); |
| 316 | r = cmp_bss(&res->pub, &bss->pub); |
| 317 | |
| 318 | if (r == 0) |
| 319 | return bss; |
| 320 | else if (r < 0) |
| 321 | n = n->rb_left; |
| 322 | else |
| 323 | n = n->rb_right; |
| 324 | } |
| 325 | |
| 326 | return NULL; |
| 327 | } |
| 328 | |
| 329 | static struct cfg80211_internal_bss * |
| 330 | cfg80211_bss_update(struct cfg80211_registered_device *dev, |
| 331 | struct cfg80211_internal_bss *res, |
| 332 | bool overwrite) |
| 333 | { |
| 334 | struct cfg80211_internal_bss *found = NULL; |
| 335 | const u8 *meshid, *meshcfg; |
| 336 | |
| 337 | /* |
| 338 | * The reference to "res" is donated to this function. |
| 339 | */ |
| 340 | |
| 341 | if (WARN_ON(!res->pub.channel)) { |
| 342 | kref_put(&res->ref, bss_release); |
| 343 | return NULL; |
| 344 | } |
| 345 | |
| 346 | res->ts = jiffies; |
| 347 | |
| 348 | if (is_zero_ether_addr(res->pub.bssid)) { |
| 349 | /* must be mesh, verify */ |
| 350 | meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements, |
| 351 | res->pub.len_information_elements); |
| 352 | meshcfg = find_ie(WLAN_EID_MESH_CONFIG, |
| 353 | res->pub.information_elements, |
| 354 | res->pub.len_information_elements); |
| 355 | if (!meshid || !meshcfg || |
| 356 | meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) { |
| 357 | /* bogus mesh */ |
| 358 | kref_put(&res->ref, bss_release); |
| 359 | return NULL; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | spin_lock_bh(&dev->bss_lock); |
| 364 | |
| 365 | found = rb_find_bss(dev, res); |
| 366 | |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 367 | if (found) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 368 | found->pub.beacon_interval = res->pub.beacon_interval; |
| 369 | found->pub.tsf = res->pub.tsf; |
| 370 | found->pub.signal = res->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 371 | found->pub.capability = res->pub.capability; |
| 372 | found->ts = res->ts; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 373 | |
| 374 | /* overwrite IEs */ |
| 375 | if (overwrite) { |
| 376 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
| 377 | size_t ielen = res->pub.len_information_elements; |
| 378 | |
Michael Buesch | 44e1b98 | 2009-04-26 11:27:33 +0200 | [diff] [blame] | 379 | if (!found->ies_allocated && ksize(found) >= used + ielen) { |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 380 | memcpy(found->pub.information_elements, |
| 381 | res->pub.information_elements, ielen); |
| 382 | found->pub.len_information_elements = ielen; |
| 383 | } else { |
| 384 | u8 *ies = found->pub.information_elements; |
| 385 | |
Michael Buesch | 273de92 | 2009-04-25 22:28:55 +0200 | [diff] [blame] | 386 | if (found->ies_allocated) |
| 387 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
| 388 | else |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 389 | ies = kmalloc(ielen, GFP_ATOMIC); |
| 390 | |
| 391 | if (ies) { |
| 392 | memcpy(ies, res->pub.information_elements, ielen); |
| 393 | found->ies_allocated = true; |
| 394 | found->pub.information_elements = ies; |
Johannes Berg | c0f0aac | 2009-04-30 20:09:56 +0200 | [diff] [blame] | 395 | found->pub.len_information_elements = ielen; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 400 | kref_put(&res->ref, bss_release); |
| 401 | } else { |
| 402 | /* this "consumes" the reference */ |
| 403 | list_add_tail(&res->list, &dev->bss_list); |
| 404 | rb_insert_bss(dev, res); |
| 405 | found = res; |
| 406 | } |
| 407 | |
| 408 | dev->bss_generation++; |
| 409 | spin_unlock_bh(&dev->bss_lock); |
| 410 | |
| 411 | kref_get(&found->ref); |
| 412 | return found; |
| 413 | } |
| 414 | |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 415 | struct cfg80211_bss* |
| 416 | cfg80211_inform_bss(struct wiphy *wiphy, |
| 417 | struct ieee80211_channel *channel, |
| 418 | const u8 *bssid, |
| 419 | u64 timestamp, u16 capability, u16 beacon_interval, |
| 420 | const u8 *ie, size_t ielen, |
| 421 | s32 signal, gfp_t gfp) |
| 422 | { |
| 423 | struct cfg80211_internal_bss *res; |
| 424 | size_t privsz; |
| 425 | |
| 426 | if (WARN_ON(!wiphy)) |
| 427 | return NULL; |
| 428 | |
| 429 | privsz = wiphy->bss_priv_size; |
| 430 | |
| 431 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
| 432 | (signal < 0 || signal > 100))) |
| 433 | return NULL; |
| 434 | |
| 435 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
| 436 | if (!res) |
| 437 | return NULL; |
| 438 | |
| 439 | memcpy(res->pub.bssid, bssid, ETH_ALEN); |
| 440 | res->pub.channel = channel; |
| 441 | res->pub.signal = signal; |
| 442 | res->pub.tsf = timestamp; |
| 443 | res->pub.beacon_interval = beacon_interval; |
| 444 | res->pub.capability = capability; |
| 445 | /* point to after the private area */ |
| 446 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; |
| 447 | memcpy(res->pub.information_elements, ie, ielen); |
| 448 | res->pub.len_information_elements = ielen; |
| 449 | |
| 450 | kref_init(&res->ref); |
| 451 | |
| 452 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0); |
| 453 | if (!res) |
| 454 | return NULL; |
| 455 | |
| 456 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 457 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 458 | |
| 459 | /* cfg80211_bss_update gives us a referenced result */ |
| 460 | return &res->pub; |
| 461 | } |
| 462 | EXPORT_SYMBOL(cfg80211_inform_bss); |
| 463 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 464 | struct cfg80211_bss * |
| 465 | cfg80211_inform_bss_frame(struct wiphy *wiphy, |
| 466 | struct ieee80211_channel *channel, |
| 467 | struct ieee80211_mgmt *mgmt, size_t len, |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 468 | s32 signal, gfp_t gfp) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 469 | { |
| 470 | struct cfg80211_internal_bss *res; |
| 471 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
| 472 | u.probe_resp.variable); |
| 473 | bool overwrite; |
| 474 | size_t privsz = wiphy->bss_priv_size; |
| 475 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 476 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 477 | (signal < 0 || signal > 100))) |
| 478 | return NULL; |
| 479 | |
| 480 | if (WARN_ON(!mgmt || !wiphy || |
| 481 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
| 482 | return NULL; |
| 483 | |
| 484 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
| 485 | if (!res) |
| 486 | return NULL; |
| 487 | |
| 488 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); |
| 489 | res->pub.channel = channel; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 490 | res->pub.signal = signal; |
| 491 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
| 492 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
| 493 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); |
| 494 | /* point to after the private area */ |
| 495 | res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz; |
| 496 | memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen); |
| 497 | res->pub.len_information_elements = ielen; |
| 498 | |
| 499 | kref_init(&res->ref); |
| 500 | |
| 501 | overwrite = ieee80211_is_probe_resp(mgmt->frame_control); |
| 502 | |
| 503 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite); |
| 504 | if (!res) |
| 505 | return NULL; |
| 506 | |
Luis R. Rodriguez | e38f8a7 | 2009-02-21 00:20:39 -0500 | [diff] [blame] | 507 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 508 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 509 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 510 | /* cfg80211_bss_update gives us a referenced result */ |
| 511 | return &res->pub; |
| 512 | } |
| 513 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); |
| 514 | |
| 515 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
| 516 | { |
| 517 | struct cfg80211_internal_bss *bss; |
| 518 | |
| 519 | if (!pub) |
| 520 | return; |
| 521 | |
| 522 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 523 | kref_put(&bss->ref, bss_release); |
| 524 | } |
| 525 | EXPORT_SYMBOL(cfg80211_put_bss); |
| 526 | |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 527 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
| 528 | { |
| 529 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 530 | struct cfg80211_internal_bss *bss; |
| 531 | |
| 532 | if (WARN_ON(!pub)) |
| 533 | return; |
| 534 | |
| 535 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 536 | |
| 537 | spin_lock_bh(&dev->bss_lock); |
| 538 | |
| 539 | list_del(&bss->list); |
| 540 | rb_erase(&bss->rbn, &dev->bss_tree); |
| 541 | |
| 542 | spin_unlock_bh(&dev->bss_lock); |
| 543 | |
| 544 | kref_put(&bss->ref, bss_release); |
| 545 | } |
| 546 | EXPORT_SYMBOL(cfg80211_unlink_bss); |
| 547 | |
Kalle Valo | a08c1c1 | 2009-03-22 21:57:28 +0200 | [diff] [blame] | 548 | void cfg80211_hold_bss(struct cfg80211_bss *pub) |
| 549 | { |
| 550 | struct cfg80211_internal_bss *bss; |
| 551 | |
| 552 | if (!pub) |
| 553 | return; |
| 554 | |
| 555 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 556 | bss->hold = true; |
| 557 | } |
| 558 | EXPORT_SYMBOL(cfg80211_hold_bss); |
| 559 | |
| 560 | void cfg80211_unhold_bss(struct cfg80211_bss *pub) |
| 561 | { |
| 562 | struct cfg80211_internal_bss *bss; |
| 563 | |
| 564 | if (!pub) |
| 565 | return; |
| 566 | |
| 567 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 568 | bss->hold = false; |
| 569 | } |
| 570 | EXPORT_SYMBOL(cfg80211_unhold_bss); |
| 571 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 572 | #ifdef CONFIG_WIRELESS_EXT |
| 573 | int cfg80211_wext_siwscan(struct net_device *dev, |
| 574 | struct iw_request_info *info, |
| 575 | union iwreq_data *wrqu, char *extra) |
| 576 | { |
| 577 | struct cfg80211_registered_device *rdev; |
| 578 | struct wiphy *wiphy; |
| 579 | struct iw_scan_req *wreq = NULL; |
| 580 | struct cfg80211_scan_request *creq; |
| 581 | int i, err, n_channels = 0; |
| 582 | enum ieee80211_band band; |
| 583 | |
| 584 | if (!netif_running(dev)) |
| 585 | return -ENETDOWN; |
| 586 | |
| 587 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); |
| 588 | |
| 589 | if (IS_ERR(rdev)) |
| 590 | return PTR_ERR(rdev); |
| 591 | |
| 592 | if (rdev->scan_req) { |
| 593 | err = -EBUSY; |
| 594 | goto out; |
| 595 | } |
| 596 | |
| 597 | wiphy = &rdev->wiphy; |
| 598 | |
| 599 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) |
| 600 | if (wiphy->bands[band]) |
| 601 | n_channels += wiphy->bands[band]->n_channels; |
| 602 | |
| 603 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + |
| 604 | n_channels * sizeof(void *), |
| 605 | GFP_ATOMIC); |
| 606 | if (!creq) { |
| 607 | err = -ENOMEM; |
| 608 | goto out; |
| 609 | } |
| 610 | |
| 611 | creq->wiphy = wiphy; |
| 612 | creq->ifidx = dev->ifindex; |
| 613 | creq->ssids = (void *)(creq + 1); |
| 614 | creq->channels = (void *)(creq->ssids + 1); |
| 615 | creq->n_channels = n_channels; |
| 616 | creq->n_ssids = 1; |
| 617 | |
| 618 | /* all channels */ |
| 619 | i = 0; |
| 620 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 621 | int j; |
| 622 | if (!wiphy->bands[band]) |
| 623 | continue; |
| 624 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
| 625 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
| 626 | i++; |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | /* translate scan request */ |
| 631 | if (wrqu->data.length == sizeof(struct iw_scan_req)) { |
| 632 | wreq = (struct iw_scan_req *)extra; |
| 633 | |
| 634 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
| 635 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) |
| 636 | return -EINVAL; |
| 637 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
| 638 | creq->ssids[0].ssid_len = wreq->essid_len; |
| 639 | } |
| 640 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) |
| 641 | creq->n_ssids = 0; |
| 642 | } |
| 643 | |
| 644 | rdev->scan_req = creq; |
| 645 | err = rdev->ops->scan(wiphy, dev, creq); |
| 646 | if (err) { |
| 647 | rdev->scan_req = NULL; |
| 648 | kfree(creq); |
| 649 | } |
| 650 | out: |
| 651 | cfg80211_put_dev(rdev); |
| 652 | return err; |
| 653 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 654 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 655 | |
| 656 | static void ieee80211_scan_add_ies(struct iw_request_info *info, |
| 657 | struct cfg80211_bss *bss, |
| 658 | char **current_ev, char *end_buf) |
| 659 | { |
| 660 | u8 *pos, *end, *next; |
| 661 | struct iw_event iwe; |
| 662 | |
| 663 | if (!bss->information_elements || |
| 664 | !bss->len_information_elements) |
| 665 | return; |
| 666 | |
| 667 | /* |
| 668 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
| 669 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
| 670 | */ |
| 671 | pos = bss->information_elements; |
| 672 | end = pos + bss->len_information_elements; |
| 673 | |
| 674 | while (end - pos > IW_GENERIC_IE_MAX) { |
| 675 | next = pos + 2 + pos[1]; |
| 676 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
| 677 | next = next + 2 + next[1]; |
| 678 | |
| 679 | memset(&iwe, 0, sizeof(iwe)); |
| 680 | iwe.cmd = IWEVGENIE; |
| 681 | iwe.u.data.length = next - pos; |
| 682 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 683 | end_buf, &iwe, pos); |
| 684 | |
| 685 | pos = next; |
| 686 | } |
| 687 | |
| 688 | if (end > pos) { |
| 689 | memset(&iwe, 0, sizeof(iwe)); |
| 690 | iwe.cmd = IWEVGENIE; |
| 691 | iwe.u.data.length = end - pos; |
| 692 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 693 | end_buf, &iwe, pos); |
| 694 | } |
| 695 | } |
| 696 | |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 697 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
| 698 | { |
| 699 | unsigned long end = jiffies; |
| 700 | |
| 701 | if (end >= start) |
| 702 | return jiffies_to_msecs(end - start); |
| 703 | |
| 704 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); |
| 705 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 706 | |
| 707 | static char * |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 708 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
| 709 | struct cfg80211_internal_bss *bss, char *current_ev, |
| 710 | char *end_buf) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 711 | { |
| 712 | struct iw_event iwe; |
| 713 | u8 *buf, *cfg, *p; |
| 714 | u8 *ie = bss->pub.information_elements; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 715 | int rem = bss->pub.len_information_elements, i, sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 716 | bool ismesh = false; |
| 717 | |
| 718 | memset(&iwe, 0, sizeof(iwe)); |
| 719 | iwe.cmd = SIOCGIWAP; |
| 720 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
| 721 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); |
| 722 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 723 | IW_EV_ADDR_LEN); |
| 724 | |
| 725 | memset(&iwe, 0, sizeof(iwe)); |
| 726 | iwe.cmd = SIOCGIWFREQ; |
| 727 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); |
| 728 | iwe.u.freq.e = 0; |
| 729 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 730 | IW_EV_FREQ_LEN); |
| 731 | |
| 732 | memset(&iwe, 0, sizeof(iwe)); |
| 733 | iwe.cmd = SIOCGIWFREQ; |
| 734 | iwe.u.freq.m = bss->pub.channel->center_freq; |
| 735 | iwe.u.freq.e = 6; |
| 736 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 737 | IW_EV_FREQ_LEN); |
| 738 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 739 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 740 | memset(&iwe, 0, sizeof(iwe)); |
| 741 | iwe.cmd = IWEVQUAL; |
| 742 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | |
| 743 | IW_QUAL_NOISE_INVALID | |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 744 | IW_QUAL_QUAL_UPDATED; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 745 | switch (wiphy->signal_type) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 746 | case CFG80211_SIGNAL_TYPE_MBM: |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 747 | sig = bss->pub.signal / 100; |
| 748 | iwe.u.qual.level = sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 749 | iwe.u.qual.updated |= IW_QUAL_DBM; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 750 | if (sig < -110) /* rather bad */ |
| 751 | sig = -110; |
| 752 | else if (sig > -40) /* perfect */ |
| 753 | sig = -40; |
| 754 | /* will give a range of 0 .. 70 */ |
| 755 | iwe.u.qual.qual = sig + 110; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 756 | break; |
| 757 | case CFG80211_SIGNAL_TYPE_UNSPEC: |
| 758 | iwe.u.qual.level = bss->pub.signal; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 759 | /* will give range 0 .. 100 */ |
| 760 | iwe.u.qual.qual = bss->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 761 | break; |
| 762 | default: |
| 763 | /* not reached */ |
| 764 | break; |
| 765 | } |
| 766 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 767 | &iwe, IW_EV_QUAL_LEN); |
| 768 | } |
| 769 | |
| 770 | memset(&iwe, 0, sizeof(iwe)); |
| 771 | iwe.cmd = SIOCGIWENCODE; |
| 772 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) |
| 773 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
| 774 | else |
| 775 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
| 776 | iwe.u.data.length = 0; |
| 777 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 778 | &iwe, ""); |
| 779 | |
| 780 | while (rem >= 2) { |
| 781 | /* invalid data */ |
| 782 | if (ie[1] > rem - 2) |
| 783 | break; |
| 784 | |
| 785 | switch (ie[0]) { |
| 786 | case WLAN_EID_SSID: |
| 787 | memset(&iwe, 0, sizeof(iwe)); |
| 788 | iwe.cmd = SIOCGIWESSID; |
| 789 | iwe.u.data.length = ie[1]; |
| 790 | iwe.u.data.flags = 1; |
| 791 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 792 | &iwe, ie + 2); |
| 793 | break; |
| 794 | case WLAN_EID_MESH_ID: |
| 795 | memset(&iwe, 0, sizeof(iwe)); |
| 796 | iwe.cmd = SIOCGIWESSID; |
| 797 | iwe.u.data.length = ie[1]; |
| 798 | iwe.u.data.flags = 1; |
| 799 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 800 | &iwe, ie + 2); |
| 801 | break; |
| 802 | case WLAN_EID_MESH_CONFIG: |
| 803 | ismesh = true; |
| 804 | if (ie[1] != IEEE80211_MESH_CONFIG_LEN) |
| 805 | break; |
| 806 | buf = kmalloc(50, GFP_ATOMIC); |
| 807 | if (!buf) |
| 808 | break; |
| 809 | cfg = ie + 2; |
| 810 | memset(&iwe, 0, sizeof(iwe)); |
| 811 | iwe.cmd = IWEVCUSTOM; |
| 812 | sprintf(buf, "Mesh network (version %d)", cfg[0]); |
| 813 | iwe.u.data.length = strlen(buf); |
| 814 | current_ev = iwe_stream_add_point(info, current_ev, |
| 815 | end_buf, |
| 816 | &iwe, buf); |
| 817 | sprintf(buf, "Path Selection Protocol ID: " |
| 818 | "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3], |
| 819 | cfg[4]); |
| 820 | iwe.u.data.length = strlen(buf); |
| 821 | current_ev = iwe_stream_add_point(info, current_ev, |
| 822 | end_buf, |
| 823 | &iwe, buf); |
| 824 | sprintf(buf, "Path Selection Metric ID: " |
| 825 | "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7], |
| 826 | cfg[8]); |
| 827 | iwe.u.data.length = strlen(buf); |
| 828 | current_ev = iwe_stream_add_point(info, current_ev, |
| 829 | end_buf, |
| 830 | &iwe, buf); |
| 831 | sprintf(buf, "Congestion Control Mode ID: " |
| 832 | "0x%02X%02X%02X%02X", cfg[9], cfg[10], |
| 833 | cfg[11], cfg[12]); |
| 834 | iwe.u.data.length = strlen(buf); |
| 835 | current_ev = iwe_stream_add_point(info, current_ev, |
| 836 | end_buf, |
| 837 | &iwe, buf); |
| 838 | sprintf(buf, "Channel Precedence: " |
| 839 | "0x%02X%02X%02X%02X", cfg[13], cfg[14], |
| 840 | cfg[15], cfg[16]); |
| 841 | iwe.u.data.length = strlen(buf); |
| 842 | current_ev = iwe_stream_add_point(info, current_ev, |
| 843 | end_buf, |
| 844 | &iwe, buf); |
| 845 | kfree(buf); |
| 846 | break; |
| 847 | case WLAN_EID_SUPP_RATES: |
| 848 | case WLAN_EID_EXT_SUPP_RATES: |
| 849 | /* display all supported rates in readable format */ |
| 850 | p = current_ev + iwe_stream_lcp_len(info); |
| 851 | |
| 852 | memset(&iwe, 0, sizeof(iwe)); |
| 853 | iwe.cmd = SIOCGIWRATE; |
| 854 | /* Those two flags are ignored... */ |
| 855 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
| 856 | |
| 857 | for (i = 0; i < ie[1]; i++) { |
| 858 | iwe.u.bitrate.value = |
| 859 | ((ie[i + 2] & 0x7f) * 500000); |
| 860 | p = iwe_stream_add_value(info, current_ev, p, |
| 861 | end_buf, &iwe, IW_EV_PARAM_LEN); |
| 862 | } |
| 863 | current_ev = p; |
| 864 | break; |
| 865 | } |
| 866 | rem -= ie[1] + 2; |
| 867 | ie += ie[1] + 2; |
| 868 | } |
| 869 | |
| 870 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) |
| 871 | || ismesh) { |
| 872 | memset(&iwe, 0, sizeof(iwe)); |
| 873 | iwe.cmd = SIOCGIWMODE; |
| 874 | if (ismesh) |
| 875 | iwe.u.mode = IW_MODE_MESH; |
| 876 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) |
| 877 | iwe.u.mode = IW_MODE_MASTER; |
| 878 | else |
| 879 | iwe.u.mode = IW_MODE_ADHOC; |
| 880 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 881 | &iwe, IW_EV_UINT_LEN); |
| 882 | } |
| 883 | |
| 884 | buf = kmalloc(30, GFP_ATOMIC); |
| 885 | if (buf) { |
| 886 | memset(&iwe, 0, sizeof(iwe)); |
| 887 | iwe.cmd = IWEVCUSTOM; |
| 888 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); |
| 889 | iwe.u.data.length = strlen(buf); |
| 890 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 891 | &iwe, buf); |
| 892 | memset(&iwe, 0, sizeof(iwe)); |
| 893 | iwe.cmd = IWEVCUSTOM; |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 894 | sprintf(buf, " Last beacon: %ums ago", |
| 895 | elapsed_jiffies_msecs(bss->ts)); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 896 | iwe.u.data.length = strlen(buf); |
| 897 | current_ev = iwe_stream_add_point(info, current_ev, |
| 898 | end_buf, &iwe, buf); |
| 899 | kfree(buf); |
| 900 | } |
| 901 | |
| 902 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); |
| 903 | |
| 904 | return current_ev; |
| 905 | } |
| 906 | |
| 907 | |
| 908 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, |
| 909 | struct iw_request_info *info, |
| 910 | char *buf, size_t len) |
| 911 | { |
| 912 | char *current_ev = buf; |
| 913 | char *end_buf = buf + len; |
| 914 | struct cfg80211_internal_bss *bss; |
| 915 | |
| 916 | spin_lock_bh(&dev->bss_lock); |
| 917 | cfg80211_bss_expire(dev); |
| 918 | |
| 919 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 920 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
| 921 | spin_unlock_bh(&dev->bss_lock); |
| 922 | return -E2BIG; |
| 923 | } |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 924 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
| 925 | current_ev, end_buf); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 926 | } |
| 927 | spin_unlock_bh(&dev->bss_lock); |
| 928 | return current_ev - buf; |
| 929 | } |
| 930 | |
| 931 | |
| 932 | int cfg80211_wext_giwscan(struct net_device *dev, |
| 933 | struct iw_request_info *info, |
| 934 | struct iw_point *data, char *extra) |
| 935 | { |
| 936 | struct cfg80211_registered_device *rdev; |
| 937 | int res; |
| 938 | |
| 939 | if (!netif_running(dev)) |
| 940 | return -ENETDOWN; |
| 941 | |
| 942 | rdev = cfg80211_get_dev_from_ifindex(dev->ifindex); |
| 943 | |
| 944 | if (IS_ERR(rdev)) |
| 945 | return PTR_ERR(rdev); |
| 946 | |
| 947 | if (rdev->scan_req) { |
| 948 | res = -EAGAIN; |
| 949 | goto out; |
| 950 | } |
| 951 | |
| 952 | res = ieee80211_scan_results(rdev, info, extra, data->length); |
| 953 | data->length = 0; |
| 954 | if (res >= 0) { |
| 955 | data->length = res; |
| 956 | res = 0; |
| 957 | } |
| 958 | |
| 959 | out: |
| 960 | cfg80211_put_dev(rdev); |
| 961 | return res; |
| 962 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 963 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 964 | #endif |