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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 7 | #include <linux/slab.h> |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 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" |
Johannes Berg | a9a1162 | 2009-07-27 12:01:53 +0200 | [diff] [blame] | 18 | #include "wext-compat.h" |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 19 | |
Helmut Schaa | 09f97e0 | 2009-07-23 12:14:29 +0200 | [diff] [blame] | 20 | #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 21 | |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 22 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 23 | { |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 24 | struct cfg80211_scan_request *request; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 25 | struct net_device *dev; |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 26 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 27 | union iwreq_data wrqu; |
| 28 | #endif |
| 29 | |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 30 | ASSERT_RDEV_LOCK(rdev); |
| 31 | |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 32 | request = rdev->scan_req; |
| 33 | |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 34 | if (!request) |
| 35 | return; |
| 36 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 37 | dev = request->dev; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 38 | |
Johannes Berg | 6829c87 | 2009-07-02 09:13:27 +0200 | [diff] [blame] | 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 | |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 46 | if (request->aborted) |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 47 | nl80211_send_scan_aborted(rdev, dev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 48 | else |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 49 | nl80211_send_scan_done(rdev, dev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 50 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 51 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 52 | if (!request->aborted) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 53 | memset(&wrqu, 0, sizeof(wrqu)); |
| 54 | |
| 55 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); |
| 56 | } |
| 57 | #endif |
| 58 | |
| 59 | dev_put(dev); |
| 60 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 61 | rdev->scan_req = NULL; |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 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); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 73 | } |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 74 | |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 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); |
Johannes Berg | 01a0ac4 | 2009-08-20 21:36:16 +0200 | [diff] [blame] | 83 | ___cfg80211_scan_done(rdev, false); |
Johannes Berg | 36e6fea | 2009-08-12 22:21:21 +0200 | [diff] [blame] | 84 | cfg80211_unlock_rdev(rdev); |
| 85 | } |
| 86 | |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 87 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
| 88 | { |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 89 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
| 90 | |
| 91 | request->aborted = aborted; |
Alban Browaeys | e60d744 | 2009-11-25 15:13:00 +0100 | [diff] [blame] | 92 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
Johannes Berg | 667503dd | 2009-07-07 03:56:11 +0200 | [diff] [blame] | 93 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 94 | EXPORT_SYMBOL(cfg80211_scan_done); |
| 95 | |
| 96 | static void bss_release(struct kref *ref) |
| 97 | { |
| 98 | struct cfg80211_internal_bss *bss; |
| 99 | |
| 100 | bss = container_of(ref, struct cfg80211_internal_bss, ref); |
Johannes Berg | 78c1c7e | 2009-02-10 21:25:57 +0100 | [diff] [blame] | 101 | if (bss->pub.free_priv) |
| 102 | bss->pub.free_priv(&bss->pub); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 103 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 104 | if (bss->beacon_ies_allocated) |
| 105 | kfree(bss->pub.beacon_ies); |
| 106 | if (bss->proberesp_ies_allocated) |
| 107 | kfree(bss->pub.proberesp_ies); |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 108 | |
Johannes Berg | 19957bb | 2009-07-02 17:20:43 +0200 | [diff] [blame] | 109 | BUG_ON(atomic_read(&bss->hold)); |
| 110 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 111 | kfree(bss); |
| 112 | } |
| 113 | |
| 114 | /* must hold dev->bss_lock! */ |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 115 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
| 116 | unsigned long age_secs) |
| 117 | { |
| 118 | struct cfg80211_internal_bss *bss; |
| 119 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); |
| 120 | |
| 121 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 122 | bss->ts -= age_jiffies; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* must hold dev->bss_lock! */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 127 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
| 128 | { |
| 129 | struct cfg80211_internal_bss *bss, *tmp; |
| 130 | bool expired = false; |
| 131 | |
| 132 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
Johannes Berg | 19957bb | 2009-07-02 17:20:43 +0200 | [diff] [blame] | 133 | if (atomic_read(&bss->hold)) |
| 134 | continue; |
| 135 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 136 | continue; |
| 137 | list_del(&bss->list); |
| 138 | rb_erase(&bss->rbn, &dev->bss_tree); |
| 139 | kref_put(&bss->ref, bss_release); |
| 140 | expired = true; |
| 141 | } |
| 142 | |
| 143 | if (expired) |
| 144 | dev->bss_generation++; |
| 145 | } |
| 146 | |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 147 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 148 | { |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 149 | while (len > 2 && ies[0] != eid) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 150 | len -= ies[1] + 2; |
| 151 | ies += ies[1] + 2; |
| 152 | } |
| 153 | if (len < 2) |
| 154 | return NULL; |
| 155 | if (len < 2 + ies[1]) |
| 156 | return NULL; |
| 157 | return ies; |
| 158 | } |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 159 | EXPORT_SYMBOL(cfg80211_find_ie); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 160 | |
| 161 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) |
| 162 | { |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 163 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
| 164 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 165 | int r; |
| 166 | |
| 167 | if (!ie1 && !ie2) |
| 168 | return 0; |
Johannes Berg | cd3468b | 2009-07-29 22:07:44 +0200 | [diff] [blame] | 169 | if (!ie1 || !ie2) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 170 | return -1; |
| 171 | |
| 172 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); |
| 173 | if (r == 0 && ie1[1] != ie2[1]) |
| 174 | return ie2[1] - ie1[1]; |
| 175 | return r; |
| 176 | } |
| 177 | |
| 178 | static bool is_bss(struct cfg80211_bss *a, |
| 179 | const u8 *bssid, |
| 180 | const u8 *ssid, size_t ssid_len) |
| 181 | { |
| 182 | const u8 *ssidie; |
| 183 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 184 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 185 | return false; |
| 186 | |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 187 | if (!ssid) |
| 188 | return true; |
| 189 | |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 190 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, |
| 191 | a->information_elements, |
| 192 | a->len_information_elements); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 193 | if (!ssidie) |
| 194 | return false; |
| 195 | if (ssidie[1] != ssid_len) |
| 196 | return false; |
| 197 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; |
| 198 | } |
| 199 | |
| 200 | static bool is_mesh(struct cfg80211_bss *a, |
| 201 | const u8 *meshid, size_t meshidlen, |
| 202 | const u8 *meshcfg) |
| 203 | { |
| 204 | const u8 *ie; |
| 205 | |
| 206 | if (!is_zero_ether_addr(a->bssid)) |
| 207 | return false; |
| 208 | |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 209 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 210 | a->information_elements, |
| 211 | a->len_information_elements); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 212 | if (!ie) |
| 213 | return false; |
| 214 | if (ie[1] != meshidlen) |
| 215 | return false; |
| 216 | if (memcmp(ie + 2, meshid, meshidlen)) |
| 217 | return false; |
| 218 | |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 219 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 220 | a->information_elements, |
| 221 | a->len_information_elements); |
Johannes Berg | cd3468b | 2009-07-29 22:07:44 +0200 | [diff] [blame] | 222 | if (!ie) |
| 223 | return false; |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 224 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 225 | return false; |
| 226 | |
| 227 | /* |
| 228 | * Ignore mesh capability (last two bytes of the IE) when |
| 229 | * comparing since that may differ between stations taking |
| 230 | * part in the same mesh. |
| 231 | */ |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 232 | return memcmp(ie + 2, meshcfg, |
| 233 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | static int cmp_bss(struct cfg80211_bss *a, |
| 237 | struct cfg80211_bss *b) |
| 238 | { |
| 239 | int r; |
| 240 | |
| 241 | if (a->channel != b->channel) |
| 242 | return b->channel->center_freq - a->channel->center_freq; |
| 243 | |
| 244 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); |
| 245 | if (r) |
| 246 | return r; |
| 247 | |
| 248 | if (is_zero_ether_addr(a->bssid)) { |
| 249 | r = cmp_ies(WLAN_EID_MESH_ID, |
| 250 | a->information_elements, |
| 251 | a->len_information_elements, |
| 252 | b->information_elements, |
| 253 | b->len_information_elements); |
| 254 | if (r) |
| 255 | return r; |
| 256 | return cmp_ies(WLAN_EID_MESH_CONFIG, |
| 257 | a->information_elements, |
| 258 | a->len_information_elements, |
| 259 | b->information_elements, |
| 260 | b->len_information_elements); |
| 261 | } |
| 262 | |
| 263 | return cmp_ies(WLAN_EID_SSID, |
| 264 | a->information_elements, |
| 265 | a->len_information_elements, |
| 266 | b->information_elements, |
| 267 | b->len_information_elements); |
| 268 | } |
| 269 | |
| 270 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
| 271 | struct ieee80211_channel *channel, |
| 272 | const u8 *bssid, |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 273 | const u8 *ssid, size_t ssid_len, |
| 274 | u16 capa_mask, u16 capa_val) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 275 | { |
| 276 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 277 | struct cfg80211_internal_bss *bss, *res = NULL; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 278 | unsigned long now = jiffies; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 279 | |
| 280 | spin_lock_bh(&dev->bss_lock); |
| 281 | |
| 282 | list_for_each_entry(bss, &dev->bss_list, list) { |
Johannes Berg | 79420f0 | 2009-02-10 21:25:59 +0100 | [diff] [blame] | 283 | if ((bss->pub.capability & capa_mask) != capa_val) |
| 284 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 285 | if (channel && bss->pub.channel != channel) |
| 286 | continue; |
Johannes Berg | ccb6c13 | 2010-07-13 10:55:38 +0200 | [diff] [blame] | 287 | /* Don't get expired BSS structs */ |
| 288 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && |
| 289 | !atomic_read(&bss->hold)) |
| 290 | continue; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 291 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
| 292 | res = bss; |
| 293 | kref_get(&res->ref); |
| 294 | break; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | spin_unlock_bh(&dev->bss_lock); |
| 299 | if (!res) |
| 300 | return NULL; |
| 301 | return &res->pub; |
| 302 | } |
| 303 | EXPORT_SYMBOL(cfg80211_get_bss); |
| 304 | |
| 305 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, |
| 306 | struct ieee80211_channel *channel, |
| 307 | const u8 *meshid, size_t meshidlen, |
| 308 | const u8 *meshcfg) |
| 309 | { |
| 310 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 311 | struct cfg80211_internal_bss *bss, *res = NULL; |
| 312 | |
| 313 | spin_lock_bh(&dev->bss_lock); |
| 314 | |
| 315 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 316 | if (channel && bss->pub.channel != channel) |
| 317 | continue; |
| 318 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { |
| 319 | res = bss; |
| 320 | kref_get(&res->ref); |
| 321 | break; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | spin_unlock_bh(&dev->bss_lock); |
| 326 | if (!res) |
| 327 | return NULL; |
| 328 | return &res->pub; |
| 329 | } |
| 330 | EXPORT_SYMBOL(cfg80211_get_mesh); |
| 331 | |
| 332 | |
| 333 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
| 334 | struct cfg80211_internal_bss *bss) |
| 335 | { |
| 336 | struct rb_node **p = &dev->bss_tree.rb_node; |
| 337 | struct rb_node *parent = NULL; |
| 338 | struct cfg80211_internal_bss *tbss; |
| 339 | int cmp; |
| 340 | |
| 341 | while (*p) { |
| 342 | parent = *p; |
| 343 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); |
| 344 | |
| 345 | cmp = cmp_bss(&bss->pub, &tbss->pub); |
| 346 | |
| 347 | if (WARN_ON(!cmp)) { |
| 348 | /* will sort of leak this BSS */ |
| 349 | return; |
| 350 | } |
| 351 | |
| 352 | if (cmp < 0) |
| 353 | p = &(*p)->rb_left; |
| 354 | else |
| 355 | p = &(*p)->rb_right; |
| 356 | } |
| 357 | |
| 358 | rb_link_node(&bss->rbn, parent, p); |
| 359 | rb_insert_color(&bss->rbn, &dev->bss_tree); |
| 360 | } |
| 361 | |
| 362 | static struct cfg80211_internal_bss * |
| 363 | rb_find_bss(struct cfg80211_registered_device *dev, |
| 364 | struct cfg80211_internal_bss *res) |
| 365 | { |
| 366 | struct rb_node *n = dev->bss_tree.rb_node; |
| 367 | struct cfg80211_internal_bss *bss; |
| 368 | int r; |
| 369 | |
| 370 | while (n) { |
| 371 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); |
| 372 | r = cmp_bss(&res->pub, &bss->pub); |
| 373 | |
| 374 | if (r == 0) |
| 375 | return bss; |
| 376 | else if (r < 0) |
| 377 | n = n->rb_left; |
| 378 | else |
| 379 | n = n->rb_right; |
| 380 | } |
| 381 | |
| 382 | return NULL; |
| 383 | } |
| 384 | |
| 385 | static struct cfg80211_internal_bss * |
| 386 | cfg80211_bss_update(struct cfg80211_registered_device *dev, |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 387 | struct cfg80211_internal_bss *res) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 388 | { |
| 389 | struct cfg80211_internal_bss *found = NULL; |
| 390 | const u8 *meshid, *meshcfg; |
| 391 | |
| 392 | /* |
| 393 | * The reference to "res" is donated to this function. |
| 394 | */ |
| 395 | |
| 396 | if (WARN_ON(!res->pub.channel)) { |
| 397 | kref_put(&res->ref, bss_release); |
| 398 | return NULL; |
| 399 | } |
| 400 | |
| 401 | res->ts = jiffies; |
| 402 | |
| 403 | if (is_zero_ether_addr(res->pub.bssid)) { |
| 404 | /* must be mesh, verify */ |
Johannes Berg | c21dbf9 | 2010-01-26 14:15:46 +0100 | [diff] [blame] | 405 | meshid = cfg80211_find_ie(WLAN_EID_MESH_ID, |
| 406 | res->pub.information_elements, |
| 407 | res->pub.len_information_elements); |
| 408 | meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
| 409 | res->pub.information_elements, |
| 410 | res->pub.len_information_elements); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 411 | if (!meshid || !meshcfg || |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 412 | meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 413 | /* bogus mesh */ |
| 414 | kref_put(&res->ref, bss_release); |
| 415 | return NULL; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | spin_lock_bh(&dev->bss_lock); |
| 420 | |
| 421 | found = rb_find_bss(dev, res); |
| 422 | |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 423 | if (found) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 424 | found->pub.beacon_interval = res->pub.beacon_interval; |
| 425 | found->pub.tsf = res->pub.tsf; |
| 426 | found->pub.signal = res->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 427 | found->pub.capability = res->pub.capability; |
| 428 | found->ts = res->ts; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 429 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 430 | /* Update IEs */ |
| 431 | if (res->pub.proberesp_ies) { |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 432 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 433 | size_t ielen = res->pub.len_proberesp_ies; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 434 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 435 | if (found->pub.proberesp_ies && |
| 436 | !found->proberesp_ies_allocated && |
| 437 | ksize(found) >= used + ielen) { |
| 438 | memcpy(found->pub.proberesp_ies, |
| 439 | res->pub.proberesp_ies, ielen); |
| 440 | found->pub.len_proberesp_ies = ielen; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 441 | } else { |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 442 | u8 *ies = found->pub.proberesp_ies; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 443 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 444 | if (found->proberesp_ies_allocated) |
Michael Buesch | 273de92 | 2009-04-25 22:28:55 +0200 | [diff] [blame] | 445 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
| 446 | else |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 447 | ies = kmalloc(ielen, GFP_ATOMIC); |
| 448 | |
| 449 | if (ies) { |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 450 | memcpy(ies, res->pub.proberesp_ies, |
| 451 | ielen); |
| 452 | found->proberesp_ies_allocated = true; |
| 453 | found->pub.proberesp_ies = ies; |
| 454 | found->pub.len_proberesp_ies = ielen; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* Override possible earlier Beacon frame IEs */ |
| 459 | found->pub.information_elements = |
| 460 | found->pub.proberesp_ies; |
| 461 | found->pub.len_information_elements = |
| 462 | found->pub.len_proberesp_ies; |
| 463 | } |
| 464 | if (res->pub.beacon_ies) { |
| 465 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
| 466 | size_t ielen = res->pub.len_beacon_ies; |
Sven Neumann | 01123e2 | 2010-12-09 15:05:24 +0100 | [diff] [blame] | 467 | bool information_elements_is_beacon_ies = |
| 468 | (found->pub.information_elements == |
| 469 | found->pub.beacon_ies); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 470 | |
| 471 | if (found->pub.beacon_ies && |
| 472 | !found->beacon_ies_allocated && |
| 473 | ksize(found) >= used + ielen) { |
| 474 | memcpy(found->pub.beacon_ies, |
| 475 | res->pub.beacon_ies, ielen); |
| 476 | found->pub.len_beacon_ies = ielen; |
| 477 | } else { |
| 478 | u8 *ies = found->pub.beacon_ies; |
| 479 | |
| 480 | if (found->beacon_ies_allocated) |
| 481 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
| 482 | else |
| 483 | ies = kmalloc(ielen, GFP_ATOMIC); |
| 484 | |
| 485 | if (ies) { |
| 486 | memcpy(ies, res->pub.beacon_ies, |
| 487 | ielen); |
| 488 | found->beacon_ies_allocated = true; |
| 489 | found->pub.beacon_ies = ies; |
| 490 | found->pub.len_beacon_ies = ielen; |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 491 | } |
| 492 | } |
Sven Neumann | 01123e2 | 2010-12-09 15:05:24 +0100 | [diff] [blame] | 493 | |
| 494 | /* Override IEs if they were from a beacon before */ |
| 495 | if (information_elements_is_beacon_ies) { |
| 496 | found->pub.information_elements = |
| 497 | found->pub.beacon_ies; |
| 498 | found->pub.len_information_elements = |
| 499 | found->pub.len_beacon_ies; |
| 500 | } |
Johannes Berg | cd1658f | 2009-04-16 15:00:58 +0200 | [diff] [blame] | 501 | } |
| 502 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 503 | kref_put(&res->ref, bss_release); |
| 504 | } else { |
| 505 | /* this "consumes" the reference */ |
| 506 | list_add_tail(&res->list, &dev->bss_list); |
| 507 | rb_insert_bss(dev, res); |
| 508 | found = res; |
| 509 | } |
| 510 | |
| 511 | dev->bss_generation++; |
| 512 | spin_unlock_bh(&dev->bss_lock); |
| 513 | |
| 514 | kref_get(&found->ref); |
| 515 | return found; |
| 516 | } |
| 517 | |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 518 | struct cfg80211_bss* |
| 519 | cfg80211_inform_bss(struct wiphy *wiphy, |
| 520 | struct ieee80211_channel *channel, |
| 521 | const u8 *bssid, |
| 522 | u64 timestamp, u16 capability, u16 beacon_interval, |
| 523 | const u8 *ie, size_t ielen, |
| 524 | s32 signal, gfp_t gfp) |
| 525 | { |
| 526 | struct cfg80211_internal_bss *res; |
| 527 | size_t privsz; |
| 528 | |
| 529 | if (WARN_ON(!wiphy)) |
| 530 | return NULL; |
| 531 | |
| 532 | privsz = wiphy->bss_priv_size; |
| 533 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 534 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 535 | (signal < 0 || signal > 100))) |
| 536 | return NULL; |
| 537 | |
| 538 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
| 539 | if (!res) |
| 540 | return NULL; |
| 541 | |
| 542 | memcpy(res->pub.bssid, bssid, ETH_ALEN); |
| 543 | res->pub.channel = channel; |
| 544 | res->pub.signal = signal; |
| 545 | res->pub.tsf = timestamp; |
| 546 | res->pub.beacon_interval = beacon_interval; |
| 547 | res->pub.capability = capability; |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 548 | /* |
| 549 | * Since we do not know here whether the IEs are from a Beacon or Probe |
| 550 | * Response frame, we need to pick one of the options and only use it |
| 551 | * with the driver that does not provide the full Beacon/Probe Response |
| 552 | * frame. Use Beacon frame pointer to avoid indicating that this should |
| 553 | * override the information_elements pointer should we have received an |
| 554 | * earlier indication of Probe Response data. |
| 555 | * |
| 556 | * The initial buffer for the IEs is allocated with the BSS entry and |
| 557 | * is located after the private area. |
| 558 | */ |
| 559 | res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; |
| 560 | memcpy(res->pub.beacon_ies, ie, ielen); |
| 561 | res->pub.len_beacon_ies = ielen; |
| 562 | res->pub.information_elements = res->pub.beacon_ies; |
| 563 | res->pub.len_information_elements = res->pub.len_beacon_ies; |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 564 | |
| 565 | kref_init(&res->ref); |
| 566 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 567 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
Jussi Kivilinna | 06aa7af | 2009-03-26 23:40:09 +0200 | [diff] [blame] | 568 | if (!res) |
| 569 | return NULL; |
| 570 | |
| 571 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 572 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 573 | |
| 574 | /* cfg80211_bss_update gives us a referenced result */ |
| 575 | return &res->pub; |
| 576 | } |
| 577 | EXPORT_SYMBOL(cfg80211_inform_bss); |
| 578 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 579 | struct cfg80211_bss * |
| 580 | cfg80211_inform_bss_frame(struct wiphy *wiphy, |
| 581 | struct ieee80211_channel *channel, |
| 582 | struct ieee80211_mgmt *mgmt, size_t len, |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 583 | s32 signal, gfp_t gfp) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 584 | { |
| 585 | struct cfg80211_internal_bss *res; |
| 586 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
| 587 | u.probe_resp.variable); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 588 | size_t privsz = wiphy->bss_priv_size; |
| 589 | |
Sujith | 22fe88d | 2010-05-13 10:34:08 +0530 | [diff] [blame] | 590 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 591 | (signal < 0 || signal > 100))) |
| 592 | return NULL; |
| 593 | |
| 594 | if (WARN_ON(!mgmt || !wiphy || |
| 595 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
| 596 | return NULL; |
| 597 | |
| 598 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
| 599 | if (!res) |
| 600 | return NULL; |
| 601 | |
| 602 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); |
| 603 | res->pub.channel = channel; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 604 | res->pub.signal = signal; |
| 605 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
| 606 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
| 607 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 608 | /* |
| 609 | * The initial buffer for the IEs is allocated with the BSS entry and |
| 610 | * is located after the private area. |
| 611 | */ |
| 612 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
| 613 | res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; |
| 614 | memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, |
| 615 | ielen); |
| 616 | res->pub.len_proberesp_ies = ielen; |
| 617 | res->pub.information_elements = res->pub.proberesp_ies; |
| 618 | res->pub.len_information_elements = res->pub.len_proberesp_ies; |
| 619 | } else { |
| 620 | res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; |
| 621 | memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); |
| 622 | res->pub.len_beacon_ies = ielen; |
| 623 | res->pub.information_elements = res->pub.beacon_ies; |
| 624 | res->pub.len_information_elements = res->pub.len_beacon_ies; |
| 625 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 626 | |
| 627 | kref_init(&res->ref); |
| 628 | |
Jouni Malinen | 34a6edd | 2010-01-06 16:19:24 +0200 | [diff] [blame] | 629 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 630 | if (!res) |
| 631 | return NULL; |
| 632 | |
Luis R. Rodriguez | e38f8a7 | 2009-02-21 00:20:39 -0500 | [diff] [blame] | 633 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
| 634 | regulatory_hint_found_beacon(wiphy, channel, gfp); |
| 635 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 636 | /* cfg80211_bss_update gives us a referenced result */ |
| 637 | return &res->pub; |
| 638 | } |
| 639 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); |
| 640 | |
| 641 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
| 642 | { |
| 643 | struct cfg80211_internal_bss *bss; |
| 644 | |
| 645 | if (!pub) |
| 646 | return; |
| 647 | |
| 648 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 649 | kref_put(&bss->ref, bss_release); |
| 650 | } |
| 651 | EXPORT_SYMBOL(cfg80211_put_bss); |
| 652 | |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 653 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
| 654 | { |
| 655 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
| 656 | struct cfg80211_internal_bss *bss; |
| 657 | |
| 658 | if (WARN_ON(!pub)) |
| 659 | return; |
| 660 | |
| 661 | bss = container_of(pub, struct cfg80211_internal_bss, pub); |
| 662 | |
| 663 | spin_lock_bh(&dev->bss_lock); |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 664 | if (!list_empty(&bss->list)) { |
| 665 | list_del_init(&bss->list); |
| 666 | dev->bss_generation++; |
| 667 | rb_erase(&bss->rbn, &dev->bss_tree); |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 668 | |
Johannes Berg | 3207390 | 2010-10-06 21:18:04 +0200 | [diff] [blame] | 669 | kref_put(&bss->ref, bss_release); |
| 670 | } |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 671 | spin_unlock_bh(&dev->bss_lock); |
Johannes Berg | d491af1 | 2009-02-10 21:25:58 +0100 | [diff] [blame] | 672 | } |
| 673 | EXPORT_SYMBOL(cfg80211_unlink_bss); |
| 674 | |
Johannes Berg | 3d23e34 | 2009-09-29 23:27:28 +0200 | [diff] [blame] | 675 | #ifdef CONFIG_CFG80211_WEXT |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 676 | int cfg80211_wext_siwscan(struct net_device *dev, |
| 677 | struct iw_request_info *info, |
| 678 | union iwreq_data *wrqu, char *extra) |
| 679 | { |
| 680 | struct cfg80211_registered_device *rdev; |
| 681 | struct wiphy *wiphy; |
| 682 | struct iw_scan_req *wreq = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 683 | struct cfg80211_scan_request *creq = NULL; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 684 | int i, err, n_channels = 0; |
| 685 | enum ieee80211_band band; |
| 686 | |
| 687 | if (!netif_running(dev)) |
| 688 | return -ENETDOWN; |
| 689 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 690 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
| 691 | wreq = (struct iw_scan_req *)extra; |
| 692 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 693 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 694 | |
| 695 | if (IS_ERR(rdev)) |
| 696 | return PTR_ERR(rdev); |
| 697 | |
| 698 | if (rdev->scan_req) { |
| 699 | err = -EBUSY; |
| 700 | goto out; |
| 701 | } |
| 702 | |
| 703 | wiphy = &rdev->wiphy; |
| 704 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 705 | /* Determine number of channels, needed to allocate creq */ |
| 706 | if (wreq && wreq->num_channels) |
| 707 | n_channels = wreq->num_channels; |
| 708 | else { |
| 709 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) |
| 710 | if (wiphy->bands[band]) |
| 711 | n_channels += wiphy->bands[band]->n_channels; |
| 712 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 713 | |
| 714 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + |
| 715 | n_channels * sizeof(void *), |
| 716 | GFP_ATOMIC); |
| 717 | if (!creq) { |
| 718 | err = -ENOMEM; |
| 719 | goto out; |
| 720 | } |
| 721 | |
| 722 | creq->wiphy = wiphy; |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 723 | creq->dev = dev; |
Johannes Berg | 5ba6353 | 2009-08-07 17:54:07 +0200 | [diff] [blame] | 724 | /* SSIDs come after channels */ |
| 725 | creq->ssids = (void *)&creq->channels[n_channels]; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 726 | creq->n_channels = n_channels; |
| 727 | creq->n_ssids = 1; |
| 728 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 729 | /* translate "Scan on frequencies" request */ |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 730 | i = 0; |
| 731 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| 732 | int j; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 733 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 734 | if (!wiphy->bands[band]) |
| 735 | continue; |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 736 | |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 737 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
Johannes Berg | 584991d | 2009-11-02 13:32:03 +0100 | [diff] [blame] | 738 | /* ignore disabled channels */ |
| 739 | if (wiphy->bands[band]->channels[j].flags & |
| 740 | IEEE80211_CHAN_DISABLED) |
| 741 | continue; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 742 | |
| 743 | /* If we have a wireless request structure and the |
| 744 | * wireless request specifies frequencies, then search |
| 745 | * for the matching hardware channel. |
| 746 | */ |
| 747 | if (wreq && wreq->num_channels) { |
| 748 | int k; |
| 749 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; |
| 750 | for (k = 0; k < wreq->num_channels; k++) { |
Holger Schurig | a4e7b73 | 2009-09-11 10:13:53 +0200 | [diff] [blame] | 751 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 752 | if (wext_freq == wiphy_freq) |
| 753 | goto wext_freq_found; |
| 754 | } |
| 755 | goto wext_freq_not_found; |
| 756 | } |
| 757 | |
| 758 | wext_freq_found: |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 759 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
| 760 | i++; |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 761 | wext_freq_not_found: ; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 762 | } |
| 763 | } |
Holger Schurig | 8862dc5 | 2009-09-11 10:13:55 +0200 | [diff] [blame] | 764 | /* No channels found? */ |
| 765 | if (!i) { |
| 766 | err = -EINVAL; |
| 767 | goto out; |
| 768 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 769 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 770 | /* Set real number of channels specified in creq->channels[] */ |
| 771 | creq->n_channels = i; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 772 | |
Holger Schurig | b2e3abd | 2009-09-09 13:09:54 +0200 | [diff] [blame] | 773 | /* translate "Scan for SSID" request */ |
| 774 | if (wreq) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 775 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 776 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
| 777 | err = -EINVAL; |
| 778 | goto out; |
| 779 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 780 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
| 781 | creq->ssids[0].ssid_len = wreq->essid_len; |
| 782 | } |
| 783 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) |
| 784 | creq->n_ssids = 0; |
| 785 | } |
| 786 | |
| 787 | rdev->scan_req = creq; |
| 788 | err = rdev->ops->scan(wiphy, dev, creq); |
| 789 | if (err) { |
| 790 | rdev->scan_req = NULL; |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 791 | /* creq will be freed below */ |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 792 | } else { |
Johannes Berg | a538e2d | 2009-06-16 19:56:42 +0200 | [diff] [blame] | 793 | nl80211_send_scan_start(rdev, dev); |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 794 | /* creq now owned by driver */ |
| 795 | creq = NULL; |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 796 | dev_hold(dev); |
| 797 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 798 | out: |
Johannes Berg | 65486c8 | 2009-12-23 15:33:35 +0100 | [diff] [blame] | 799 | kfree(creq); |
Johannes Berg | 4d0c8ae | 2009-07-07 03:56:09 +0200 | [diff] [blame] | 800 | cfg80211_unlock_rdev(rdev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 801 | return err; |
| 802 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 803 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 804 | |
| 805 | static void ieee80211_scan_add_ies(struct iw_request_info *info, |
| 806 | struct cfg80211_bss *bss, |
| 807 | char **current_ev, char *end_buf) |
| 808 | { |
| 809 | u8 *pos, *end, *next; |
| 810 | struct iw_event iwe; |
| 811 | |
| 812 | if (!bss->information_elements || |
| 813 | !bss->len_information_elements) |
| 814 | return; |
| 815 | |
| 816 | /* |
| 817 | * If needed, fragment the IEs buffer (at IE boundaries) into short |
| 818 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. |
| 819 | */ |
| 820 | pos = bss->information_elements; |
| 821 | end = pos + bss->len_information_elements; |
| 822 | |
| 823 | while (end - pos > IW_GENERIC_IE_MAX) { |
| 824 | next = pos + 2 + pos[1]; |
| 825 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) |
| 826 | next = next + 2 + next[1]; |
| 827 | |
| 828 | memset(&iwe, 0, sizeof(iwe)); |
| 829 | iwe.cmd = IWEVGENIE; |
| 830 | iwe.u.data.length = next - pos; |
| 831 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 832 | end_buf, &iwe, pos); |
| 833 | |
| 834 | pos = next; |
| 835 | } |
| 836 | |
| 837 | if (end > pos) { |
| 838 | memset(&iwe, 0, sizeof(iwe)); |
| 839 | iwe.cmd = IWEVGENIE; |
| 840 | iwe.u.data.length = end - pos; |
| 841 | *current_ev = iwe_stream_add_point(info, *current_ev, |
| 842 | end_buf, &iwe, pos); |
| 843 | } |
| 844 | } |
| 845 | |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 846 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
| 847 | { |
| 848 | unsigned long end = jiffies; |
| 849 | |
| 850 | if (end >= start) |
| 851 | return jiffies_to_msecs(end - start); |
| 852 | |
| 853 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); |
| 854 | } |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 855 | |
| 856 | static char * |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 857 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
| 858 | struct cfg80211_internal_bss *bss, char *current_ev, |
| 859 | char *end_buf) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 860 | { |
| 861 | struct iw_event iwe; |
| 862 | u8 *buf, *cfg, *p; |
| 863 | u8 *ie = bss->pub.information_elements; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 864 | int rem = bss->pub.len_information_elements, i, sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 865 | bool ismesh = false; |
| 866 | |
| 867 | memset(&iwe, 0, sizeof(iwe)); |
| 868 | iwe.cmd = SIOCGIWAP; |
| 869 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; |
| 870 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); |
| 871 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 872 | IW_EV_ADDR_LEN); |
| 873 | |
| 874 | memset(&iwe, 0, sizeof(iwe)); |
| 875 | iwe.cmd = SIOCGIWFREQ; |
| 876 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); |
| 877 | iwe.u.freq.e = 0; |
| 878 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 879 | IW_EV_FREQ_LEN); |
| 880 | |
| 881 | memset(&iwe, 0, sizeof(iwe)); |
| 882 | iwe.cmd = SIOCGIWFREQ; |
| 883 | iwe.u.freq.m = bss->pub.channel->center_freq; |
| 884 | iwe.u.freq.e = 6; |
| 885 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, |
| 886 | IW_EV_FREQ_LEN); |
| 887 | |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 888 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 889 | memset(&iwe, 0, sizeof(iwe)); |
| 890 | iwe.cmd = IWEVQUAL; |
| 891 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | |
| 892 | IW_QUAL_NOISE_INVALID | |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 893 | IW_QUAL_QUAL_UPDATED; |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 894 | switch (wiphy->signal_type) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 895 | case CFG80211_SIGNAL_TYPE_MBM: |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 896 | sig = bss->pub.signal / 100; |
| 897 | iwe.u.qual.level = sig; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 898 | iwe.u.qual.updated |= IW_QUAL_DBM; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 899 | if (sig < -110) /* rather bad */ |
| 900 | sig = -110; |
| 901 | else if (sig > -40) /* perfect */ |
| 902 | sig = -40; |
| 903 | /* will give a range of 0 .. 70 */ |
| 904 | iwe.u.qual.qual = sig + 110; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 905 | break; |
| 906 | case CFG80211_SIGNAL_TYPE_UNSPEC: |
| 907 | iwe.u.qual.level = bss->pub.signal; |
Johannes Berg | a77b855 | 2009-02-18 18:27:22 +0100 | [diff] [blame] | 908 | /* will give range 0 .. 100 */ |
| 909 | iwe.u.qual.qual = bss->pub.signal; |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 910 | break; |
| 911 | default: |
| 912 | /* not reached */ |
| 913 | break; |
| 914 | } |
| 915 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 916 | &iwe, IW_EV_QUAL_LEN); |
| 917 | } |
| 918 | |
| 919 | memset(&iwe, 0, sizeof(iwe)); |
| 920 | iwe.cmd = SIOCGIWENCODE; |
| 921 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) |
| 922 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; |
| 923 | else |
| 924 | iwe.u.data.flags = IW_ENCODE_DISABLED; |
| 925 | iwe.u.data.length = 0; |
| 926 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 927 | &iwe, ""); |
| 928 | |
| 929 | while (rem >= 2) { |
| 930 | /* invalid data */ |
| 931 | if (ie[1] > rem - 2) |
| 932 | break; |
| 933 | |
| 934 | switch (ie[0]) { |
| 935 | case WLAN_EID_SSID: |
| 936 | memset(&iwe, 0, sizeof(iwe)); |
| 937 | iwe.cmd = SIOCGIWESSID; |
| 938 | iwe.u.data.length = ie[1]; |
| 939 | iwe.u.data.flags = 1; |
| 940 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 941 | &iwe, ie + 2); |
| 942 | break; |
| 943 | case WLAN_EID_MESH_ID: |
| 944 | memset(&iwe, 0, sizeof(iwe)); |
| 945 | iwe.cmd = SIOCGIWESSID; |
| 946 | iwe.u.data.length = ie[1]; |
| 947 | iwe.u.data.flags = 1; |
| 948 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 949 | &iwe, ie + 2); |
| 950 | break; |
| 951 | case WLAN_EID_MESH_CONFIG: |
| 952 | ismesh = true; |
Rui Paulo | 136cfa2 | 2009-11-18 18:40:00 +0000 | [diff] [blame] | 953 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 954 | break; |
| 955 | buf = kmalloc(50, GFP_ATOMIC); |
| 956 | if (!buf) |
| 957 | break; |
| 958 | cfg = ie + 2; |
| 959 | memset(&iwe, 0, sizeof(iwe)); |
| 960 | iwe.cmd = IWEVCUSTOM; |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 961 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
| 962 | "0x%02X", cfg[0]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 963 | iwe.u.data.length = strlen(buf); |
| 964 | current_ev = iwe_stream_add_point(info, current_ev, |
| 965 | end_buf, |
| 966 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 967 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
| 968 | cfg[1]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 969 | iwe.u.data.length = strlen(buf); |
| 970 | current_ev = iwe_stream_add_point(info, current_ev, |
| 971 | end_buf, |
| 972 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 973 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
| 974 | cfg[2]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 975 | iwe.u.data.length = strlen(buf); |
| 976 | current_ev = iwe_stream_add_point(info, current_ev, |
| 977 | end_buf, |
| 978 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 979 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 980 | iwe.u.data.length = strlen(buf); |
| 981 | current_ev = iwe_stream_add_point(info, current_ev, |
| 982 | end_buf, |
| 983 | &iwe, buf); |
Rui Paulo | 76aa5e7 | 2009-11-18 18:22:59 +0000 | [diff] [blame] | 984 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
| 985 | iwe.u.data.length = strlen(buf); |
| 986 | current_ev = iwe_stream_add_point(info, current_ev, |
| 987 | end_buf, |
| 988 | &iwe, buf); |
| 989 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
| 990 | iwe.u.data.length = strlen(buf); |
| 991 | current_ev = iwe_stream_add_point(info, current_ev, |
| 992 | end_buf, |
| 993 | &iwe, buf); |
| 994 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 995 | iwe.u.data.length = strlen(buf); |
| 996 | current_ev = iwe_stream_add_point(info, current_ev, |
| 997 | end_buf, |
| 998 | &iwe, buf); |
| 999 | kfree(buf); |
| 1000 | break; |
| 1001 | case WLAN_EID_SUPP_RATES: |
| 1002 | case WLAN_EID_EXT_SUPP_RATES: |
| 1003 | /* display all supported rates in readable format */ |
| 1004 | p = current_ev + iwe_stream_lcp_len(info); |
| 1005 | |
| 1006 | memset(&iwe, 0, sizeof(iwe)); |
| 1007 | iwe.cmd = SIOCGIWRATE; |
| 1008 | /* Those two flags are ignored... */ |
| 1009 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; |
| 1010 | |
| 1011 | for (i = 0; i < ie[1]; i++) { |
| 1012 | iwe.u.bitrate.value = |
| 1013 | ((ie[i + 2] & 0x7f) * 500000); |
| 1014 | p = iwe_stream_add_value(info, current_ev, p, |
| 1015 | end_buf, &iwe, IW_EV_PARAM_LEN); |
| 1016 | } |
| 1017 | current_ev = p; |
| 1018 | break; |
| 1019 | } |
| 1020 | rem -= ie[1] + 2; |
| 1021 | ie += ie[1] + 2; |
| 1022 | } |
| 1023 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1024 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
| 1025 | ismesh) { |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1026 | memset(&iwe, 0, sizeof(iwe)); |
| 1027 | iwe.cmd = SIOCGIWMODE; |
| 1028 | if (ismesh) |
| 1029 | iwe.u.mode = IW_MODE_MESH; |
| 1030 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) |
| 1031 | iwe.u.mode = IW_MODE_MASTER; |
| 1032 | else |
| 1033 | iwe.u.mode = IW_MODE_ADHOC; |
| 1034 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, |
| 1035 | &iwe, IW_EV_UINT_LEN); |
| 1036 | } |
| 1037 | |
| 1038 | buf = kmalloc(30, GFP_ATOMIC); |
| 1039 | if (buf) { |
| 1040 | memset(&iwe, 0, sizeof(iwe)); |
| 1041 | iwe.cmd = IWEVCUSTOM; |
| 1042 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); |
| 1043 | iwe.u.data.length = strlen(buf); |
| 1044 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, |
| 1045 | &iwe, buf); |
| 1046 | memset(&iwe, 0, sizeof(iwe)); |
| 1047 | iwe.cmd = IWEVCUSTOM; |
Dan Williams | cb3a8ee | 2009-02-11 17:14:43 -0500 | [diff] [blame] | 1048 | sprintf(buf, " Last beacon: %ums ago", |
| 1049 | elapsed_jiffies_msecs(bss->ts)); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1050 | iwe.u.data.length = strlen(buf); |
| 1051 | current_ev = iwe_stream_add_point(info, current_ev, |
| 1052 | end_buf, &iwe, buf); |
| 1053 | kfree(buf); |
| 1054 | } |
| 1055 | |
| 1056 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); |
| 1057 | |
| 1058 | return current_ev; |
| 1059 | } |
| 1060 | |
| 1061 | |
| 1062 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, |
| 1063 | struct iw_request_info *info, |
| 1064 | char *buf, size_t len) |
| 1065 | { |
| 1066 | char *current_ev = buf; |
| 1067 | char *end_buf = buf + len; |
| 1068 | struct cfg80211_internal_bss *bss; |
| 1069 | |
| 1070 | spin_lock_bh(&dev->bss_lock); |
| 1071 | cfg80211_bss_expire(dev); |
| 1072 | |
| 1073 | list_for_each_entry(bss, &dev->bss_list, list) { |
| 1074 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
| 1075 | spin_unlock_bh(&dev->bss_lock); |
| 1076 | return -E2BIG; |
| 1077 | } |
Johannes Berg | 77965c9 | 2009-02-18 18:45:06 +0100 | [diff] [blame] | 1078 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
| 1079 | current_ev, end_buf); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1080 | } |
| 1081 | spin_unlock_bh(&dev->bss_lock); |
| 1082 | return current_ev - buf; |
| 1083 | } |
| 1084 | |
| 1085 | |
| 1086 | int cfg80211_wext_giwscan(struct net_device *dev, |
| 1087 | struct iw_request_info *info, |
| 1088 | struct iw_point *data, char *extra) |
| 1089 | { |
| 1090 | struct cfg80211_registered_device *rdev; |
| 1091 | int res; |
| 1092 | |
| 1093 | if (!netif_running(dev)) |
| 1094 | return -ENETDOWN; |
| 1095 | |
Johannes Berg | 463d018 | 2009-07-14 00:33:35 +0200 | [diff] [blame] | 1096 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1097 | |
| 1098 | if (IS_ERR(rdev)) |
| 1099 | return PTR_ERR(rdev); |
| 1100 | |
| 1101 | if (rdev->scan_req) { |
| 1102 | res = -EAGAIN; |
| 1103 | goto out; |
| 1104 | } |
| 1105 | |
| 1106 | res = ieee80211_scan_results(rdev, info, extra, data->length); |
| 1107 | data->length = 0; |
| 1108 | if (res >= 0) { |
| 1109 | data->length = res; |
| 1110 | res = 0; |
| 1111 | } |
| 1112 | |
| 1113 | out: |
Johannes Berg | 4d0c8ae | 2009-07-07 03:56:09 +0200 | [diff] [blame] | 1114 | cfg80211_unlock_rdev(rdev); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1115 | return res; |
| 1116 | } |
Johannes Berg | ba44cb7 | 2009-04-20 18:49:39 +0200 | [diff] [blame] | 1117 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
Johannes Berg | 2a51931 | 2009-02-10 21:25:55 +0100 | [diff] [blame] | 1118 | #endif |