Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * BSS table |
| 3 | * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi> |
| 4 | * |
Dmitry Shmidt | c5ec7f5 | 2012-03-06 16:33:24 -0800 | [diff] [blame] | 5 | * This software may be distributed under the terms of the BSD license. |
| 6 | * See README for more details. |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include "utils/includes.h" |
| 10 | |
| 11 | #include "utils/common.h" |
| 12 | #include "utils/eloop.h" |
| 13 | #include "common/ieee802_11_defs.h" |
| 14 | #include "drivers/driver.h" |
| 15 | #include "wpa_supplicant_i.h" |
| 16 | #include "config.h" |
| 17 | #include "notify.h" |
| 18 | #include "scan.h" |
| 19 | #include "bss.h" |
| 20 | |
| 21 | |
| 22 | /** |
| 23 | * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds |
| 24 | */ |
| 25 | #define WPA_BSS_EXPIRATION_PERIOD 10 |
| 26 | |
| 27 | #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0) |
| 28 | #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1) |
| 29 | #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2) |
| 30 | #define WPA_BSS_MODE_CHANGED_FLAG BIT(3) |
| 31 | #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4) |
| 32 | #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5) |
| 33 | #define WPA_BSS_WPS_CHANGED_FLAG BIT(6) |
| 34 | #define WPA_BSS_RATES_CHANGED_FLAG BIT(7) |
| 35 | #define WPA_BSS_IES_CHANGED_FLAG BIT(8) |
| 36 | |
| 37 | |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 38 | static void wpa_bss_set_hessid(struct wpa_bss *bss) |
| 39 | { |
| 40 | #ifdef CONFIG_INTERWORKING |
| 41 | const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING); |
| 42 | if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) { |
| 43 | os_memset(bss->hessid, 0, ETH_ALEN); |
| 44 | return; |
| 45 | } |
| 46 | if (ie[1] == 7) |
| 47 | os_memcpy(bss->hessid, ie + 3, ETH_ALEN); |
| 48 | else |
| 49 | os_memcpy(bss->hessid, ie + 5, ETH_ALEN); |
| 50 | #endif /* CONFIG_INTERWORKING */ |
| 51 | } |
| 52 | |
| 53 | |
| 54 | struct wpa_bss_anqp * wpa_bss_anqp_alloc(void) |
| 55 | { |
| 56 | struct wpa_bss_anqp *anqp; |
| 57 | anqp = os_zalloc(sizeof(*anqp)); |
| 58 | if (anqp == NULL) |
| 59 | return NULL; |
| 60 | anqp->users = 1; |
| 61 | return anqp; |
| 62 | } |
| 63 | |
| 64 | |
Dmitry Shmidt | d5e4923 | 2012-12-03 15:08:10 -0800 | [diff] [blame^] | 65 | static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp) |
| 66 | { |
| 67 | struct wpa_bss_anqp *n; |
| 68 | |
| 69 | n = os_zalloc(sizeof(*n)); |
| 70 | if (n == NULL) |
| 71 | return NULL; |
| 72 | |
| 73 | #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f) |
| 74 | #ifdef CONFIG_INTERWORKING |
| 75 | ANQP_DUP(venue_name); |
| 76 | ANQP_DUP(network_auth_type); |
| 77 | ANQP_DUP(roaming_consortium); |
| 78 | ANQP_DUP(ip_addr_type_availability); |
| 79 | ANQP_DUP(nai_realm); |
| 80 | ANQP_DUP(anqp_3gpp); |
| 81 | ANQP_DUP(domain_name); |
| 82 | #endif /* CONFIG_INTERWORKING */ |
| 83 | #ifdef CONFIG_HS20 |
| 84 | ANQP_DUP(hs20_operator_friendly_name); |
| 85 | ANQP_DUP(hs20_wan_metrics); |
| 86 | ANQP_DUP(hs20_connection_capability); |
| 87 | ANQP_DUP(hs20_operating_class); |
| 88 | #endif /* CONFIG_HS20 */ |
| 89 | #undef ANQP_DUP |
| 90 | |
| 91 | return n; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss) |
| 96 | { |
| 97 | struct wpa_bss_anqp *anqp; |
| 98 | |
| 99 | if (bss->anqp && bss->anqp->users > 1) { |
| 100 | /* allocated, but shared - clone an unshared copy */ |
| 101 | anqp = wpa_bss_anqp_clone(bss->anqp); |
| 102 | if (anqp == NULL) |
| 103 | return -1; |
| 104 | anqp->users = 1; |
| 105 | bss->anqp->users--; |
| 106 | bss->anqp = anqp; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | if (bss->anqp) |
| 111 | return 0; /* already allocated and not shared */ |
| 112 | |
| 113 | /* not allocated - allocate a new storage area */ |
| 114 | bss->anqp = wpa_bss_anqp_alloc(); |
| 115 | return bss->anqp ? 0 : -1; |
| 116 | } |
| 117 | |
| 118 | |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 119 | static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp) |
| 120 | { |
| 121 | if (anqp == NULL) |
| 122 | return; |
| 123 | |
| 124 | anqp->users--; |
| 125 | if (anqp->users > 0) { |
| 126 | /* Another BSS entry holds a pointer to this ANQP info */ |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | #ifdef CONFIG_INTERWORKING |
| 131 | wpabuf_free(anqp->venue_name); |
| 132 | wpabuf_free(anqp->network_auth_type); |
| 133 | wpabuf_free(anqp->roaming_consortium); |
| 134 | wpabuf_free(anqp->ip_addr_type_availability); |
| 135 | wpabuf_free(anqp->nai_realm); |
| 136 | wpabuf_free(anqp->anqp_3gpp); |
| 137 | wpabuf_free(anqp->domain_name); |
| 138 | #endif /* CONFIG_INTERWORKING */ |
| 139 | #ifdef CONFIG_HS20 |
| 140 | wpabuf_free(anqp->hs20_operator_friendly_name); |
| 141 | wpabuf_free(anqp->hs20_wan_metrics); |
| 142 | wpabuf_free(anqp->hs20_connection_capability); |
| 143 | wpabuf_free(anqp->hs20_operating_class); |
| 144 | #endif /* CONFIG_HS20 */ |
| 145 | |
| 146 | os_free(anqp); |
| 147 | } |
| 148 | |
| 149 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 150 | static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
| 151 | const char *reason) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 152 | { |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 153 | if (wpa_s->last_scan_res) { |
| 154 | unsigned int i; |
| 155 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { |
| 156 | if (wpa_s->last_scan_res[i] == bss) { |
| 157 | os_memmove(&wpa_s->last_scan_res[i], |
| 158 | &wpa_s->last_scan_res[i + 1], |
| 159 | (wpa_s->last_scan_res_used - i - 1) |
| 160 | * sizeof(struct wpa_bss *)); |
| 161 | wpa_s->last_scan_res_used--; |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | } |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 166 | dl_list_del(&bss->list); |
| 167 | dl_list_del(&bss->list_id); |
| 168 | wpa_s->num_bss--; |
| 169 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 170 | " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid), |
| 171 | wpa_ssid_txt(bss->ssid, bss->ssid_len), reason); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 172 | wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 173 | wpa_bss_anqp_free(bss->anqp); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 174 | os_free(bss); |
| 175 | } |
| 176 | |
| 177 | |
| 178 | struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, |
| 179 | const u8 *ssid, size_t ssid_len) |
| 180 | { |
| 181 | struct wpa_bss *bss; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 182 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
| 183 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 184 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 185 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && |
| 186 | bss->ssid_len == ssid_len && |
| 187 | os_memcmp(bss->ssid, ssid, ssid_len) == 0) |
| 188 | return bss; |
| 189 | } |
| 190 | return NULL; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src) |
| 195 | { |
| 196 | os_time_t usec; |
| 197 | |
| 198 | dst->flags = src->flags; |
| 199 | os_memcpy(dst->bssid, src->bssid, ETH_ALEN); |
| 200 | dst->freq = src->freq; |
| 201 | dst->beacon_int = src->beacon_int; |
| 202 | dst->caps = src->caps; |
| 203 | dst->qual = src->qual; |
| 204 | dst->noise = src->noise; |
| 205 | dst->level = src->level; |
| 206 | dst->tsf = src->tsf; |
| 207 | |
| 208 | os_get_time(&dst->last_update); |
| 209 | dst->last_update.sec -= src->age / 1000; |
| 210 | usec = (src->age % 1000) * 1000; |
| 211 | if (dst->last_update.usec < usec) { |
| 212 | dst->last_update.sec--; |
| 213 | dst->last_update.usec += 1000000; |
| 214 | } |
| 215 | dst->last_update.usec -= usec; |
| 216 | } |
| 217 | |
| 218 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 219 | static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
| 220 | { |
| 221 | struct wpa_ssid *ssid; |
| 222 | |
| 223 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| 224 | if (ssid->ssid == NULL || ssid->ssid_len == 0) |
| 225 | continue; |
| 226 | if (ssid->ssid_len == bss->ssid_len && |
| 227 | os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) |
| 228 | return 1; |
| 229 | } |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 235 | static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
| 236 | { |
| 237 | return bss == wpa_s->current_bss || |
| 238 | os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || |
| 239 | os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0; |
| 240 | } |
| 241 | |
| 242 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 243 | static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) |
| 244 | { |
| 245 | struct wpa_bss *bss; |
| 246 | |
| 247 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 248 | if (!wpa_bss_known(wpa_s, bss)) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 249 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 250 | return 0; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 258 | static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 259 | { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 260 | struct wpa_bss *bss; |
| 261 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 262 | /* |
| 263 | * Remove the oldest entry that does not match with any configured |
| 264 | * network. |
| 265 | */ |
| 266 | if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 267 | return 0; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 268 | |
| 269 | /* |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 270 | * Remove the oldest entry that isn't currently in use. |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 271 | */ |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 272 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 273 | if (!wpa_bss_in_use(wpa_s, bss)) { |
| 274 | wpa_bss_remove(wpa_s, bss, __func__); |
| 275 | return 0; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | return -1; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 283 | static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s, |
| 284 | const u8 *ssid, size_t ssid_len, |
| 285 | struct wpa_scan_res *res) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 286 | { |
| 287 | struct wpa_bss *bss; |
| 288 | |
| 289 | bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); |
| 290 | if (bss == NULL) |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 291 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 292 | bss->id = wpa_s->bss_next_id++; |
| 293 | bss->last_update_idx = wpa_s->bss_update_idx; |
| 294 | wpa_bss_copy_res(bss, res); |
| 295 | os_memcpy(bss->ssid, ssid, ssid_len); |
| 296 | bss->ssid_len = ssid_len; |
| 297 | bss->ie_len = res->ie_len; |
| 298 | bss->beacon_ie_len = res->beacon_ie_len; |
| 299 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 300 | wpa_bss_set_hessid(bss); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 301 | |
| 302 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
| 303 | dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); |
| 304 | wpa_s->num_bss++; |
| 305 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR |
| 306 | " SSID '%s'", |
| 307 | bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len)); |
| 308 | wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 309 | if (wpa_s->num_bss > wpa_s->conf->bss_max_count && |
| 310 | wpa_bss_remove_oldest(wpa_s) != 0) { |
| 311 | wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d " |
| 312 | "because all BSSes are in use. We should normally " |
| 313 | "not get here!", (int) wpa_s->num_bss); |
| 314 | wpa_s->conf->bss_max_count = wpa_s->num_bss; |
| 315 | } |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 316 | return bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | |
| 320 | static int are_ies_equal(const struct wpa_bss *old, |
| 321 | const struct wpa_scan_res *new, u32 ie) |
| 322 | { |
| 323 | const u8 *old_ie, *new_ie; |
| 324 | struct wpabuf *old_ie_buff = NULL; |
| 325 | struct wpabuf *new_ie_buff = NULL; |
| 326 | int new_ie_len, old_ie_len, ret, is_multi; |
| 327 | |
| 328 | switch (ie) { |
| 329 | case WPA_IE_VENDOR_TYPE: |
| 330 | old_ie = wpa_bss_get_vendor_ie(old, ie); |
| 331 | new_ie = wpa_scan_get_vendor_ie(new, ie); |
| 332 | is_multi = 0; |
| 333 | break; |
| 334 | case WPS_IE_VENDOR_TYPE: |
| 335 | old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); |
| 336 | new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie); |
| 337 | is_multi = 1; |
| 338 | break; |
| 339 | case WLAN_EID_RSN: |
| 340 | case WLAN_EID_SUPP_RATES: |
| 341 | case WLAN_EID_EXT_SUPP_RATES: |
| 342 | old_ie = wpa_bss_get_ie(old, ie); |
| 343 | new_ie = wpa_scan_get_ie(new, ie); |
| 344 | is_multi = 0; |
| 345 | break; |
| 346 | default: |
| 347 | wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | if (is_multi) { |
| 352 | /* in case of multiple IEs stored in buffer */ |
| 353 | old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; |
| 354 | new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; |
| 355 | old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; |
| 356 | new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; |
| 357 | } else { |
| 358 | /* in case of single IE */ |
| 359 | old_ie_len = old_ie ? old_ie[1] + 2 : 0; |
| 360 | new_ie_len = new_ie ? new_ie[1] + 2 : 0; |
| 361 | } |
| 362 | |
| 363 | if (!old_ie || !new_ie) |
| 364 | ret = !old_ie && !new_ie; |
| 365 | else |
| 366 | ret = (old_ie_len == new_ie_len && |
| 367 | os_memcmp(old_ie, new_ie, old_ie_len) == 0); |
| 368 | |
| 369 | wpabuf_free(old_ie_buff); |
| 370 | wpabuf_free(new_ie_buff); |
| 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | |
| 376 | static u32 wpa_bss_compare_res(const struct wpa_bss *old, |
| 377 | const struct wpa_scan_res *new) |
| 378 | { |
| 379 | u32 changes = 0; |
| 380 | int caps_diff = old->caps ^ new->caps; |
| 381 | |
| 382 | if (old->freq != new->freq) |
| 383 | changes |= WPA_BSS_FREQ_CHANGED_FLAG; |
| 384 | |
| 385 | if (old->level != new->level) |
| 386 | changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; |
| 387 | |
| 388 | if (caps_diff & IEEE80211_CAP_PRIVACY) |
| 389 | changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; |
| 390 | |
| 391 | if (caps_diff & IEEE80211_CAP_IBSS) |
| 392 | changes |= WPA_BSS_MODE_CHANGED_FLAG; |
| 393 | |
| 394 | if (old->ie_len == new->ie_len && |
| 395 | os_memcmp(old + 1, new + 1, old->ie_len) == 0) |
| 396 | return changes; |
| 397 | changes |= WPA_BSS_IES_CHANGED_FLAG; |
| 398 | |
| 399 | if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE)) |
| 400 | changes |= WPA_BSS_WPAIE_CHANGED_FLAG; |
| 401 | |
| 402 | if (!are_ies_equal(old, new, WLAN_EID_RSN)) |
| 403 | changes |= WPA_BSS_RSNIE_CHANGED_FLAG; |
| 404 | |
| 405 | if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE)) |
| 406 | changes |= WPA_BSS_WPS_CHANGED_FLAG; |
| 407 | |
| 408 | if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) || |
| 409 | !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES)) |
| 410 | changes |= WPA_BSS_RATES_CHANGED_FLAG; |
| 411 | |
| 412 | return changes; |
| 413 | } |
| 414 | |
| 415 | |
| 416 | static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, |
| 417 | const struct wpa_bss *bss) |
| 418 | { |
| 419 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) |
| 420 | wpas_notify_bss_freq_changed(wpa_s, bss->id); |
| 421 | |
| 422 | if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) |
| 423 | wpas_notify_bss_signal_changed(wpa_s, bss->id); |
| 424 | |
| 425 | if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) |
| 426 | wpas_notify_bss_privacy_changed(wpa_s, bss->id); |
| 427 | |
| 428 | if (changes & WPA_BSS_MODE_CHANGED_FLAG) |
| 429 | wpas_notify_bss_mode_changed(wpa_s, bss->id); |
| 430 | |
| 431 | if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) |
| 432 | wpas_notify_bss_wpaie_changed(wpa_s, bss->id); |
| 433 | |
| 434 | if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) |
| 435 | wpas_notify_bss_rsnie_changed(wpa_s, bss->id); |
| 436 | |
| 437 | if (changes & WPA_BSS_WPS_CHANGED_FLAG) |
| 438 | wpas_notify_bss_wps_changed(wpa_s, bss->id); |
| 439 | |
| 440 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
| 441 | wpas_notify_bss_ies_changed(wpa_s, bss->id); |
| 442 | |
| 443 | if (changes & WPA_BSS_RATES_CHANGED_FLAG) |
| 444 | wpas_notify_bss_rates_changed(wpa_s, bss->id); |
| 445 | } |
| 446 | |
| 447 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 448 | static struct wpa_bss * |
| 449 | wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
| 450 | struct wpa_scan_res *res) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 451 | { |
| 452 | u32 changes; |
| 453 | |
| 454 | changes = wpa_bss_compare_res(bss, res); |
| 455 | bss->scan_miss_count = 0; |
| 456 | bss->last_update_idx = wpa_s->bss_update_idx; |
| 457 | wpa_bss_copy_res(bss, res); |
| 458 | /* Move the entry to the end of the list */ |
| 459 | dl_list_del(&bss->list); |
| 460 | if (bss->ie_len + bss->beacon_ie_len >= |
| 461 | res->ie_len + res->beacon_ie_len) { |
| 462 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); |
| 463 | bss->ie_len = res->ie_len; |
| 464 | bss->beacon_ie_len = res->beacon_ie_len; |
| 465 | } else { |
| 466 | struct wpa_bss *nbss; |
| 467 | struct dl_list *prev = bss->list_id.prev; |
| 468 | dl_list_del(&bss->list_id); |
| 469 | nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + |
| 470 | res->beacon_ie_len); |
| 471 | if (nbss) { |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 472 | unsigned int i; |
| 473 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { |
| 474 | if (wpa_s->last_scan_res[i] == bss) { |
| 475 | wpa_s->last_scan_res[i] = nbss; |
| 476 | break; |
| 477 | } |
| 478 | } |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 479 | if (wpa_s->current_bss == bss) |
| 480 | wpa_s->current_bss = nbss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 481 | bss = nbss; |
| 482 | os_memcpy(bss + 1, res + 1, |
| 483 | res->ie_len + res->beacon_ie_len); |
| 484 | bss->ie_len = res->ie_len; |
| 485 | bss->beacon_ie_len = res->beacon_ie_len; |
| 486 | } |
| 487 | dl_list_add(prev, &bss->list_id); |
| 488 | } |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 489 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
| 490 | wpa_bss_set_hessid(bss); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 491 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
| 492 | |
| 493 | notify_bss_changes(wpa_s, changes, bss); |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 494 | |
| 495 | return bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 499 | void wpa_bss_update_start(struct wpa_supplicant *wpa_s) |
| 500 | { |
| 501 | wpa_s->bss_update_idx++; |
| 502 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", |
| 503 | wpa_s->bss_update_idx); |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 504 | wpa_s->last_scan_res_used = 0; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | |
| 508 | void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, |
| 509 | struct wpa_scan_res *res) |
| 510 | { |
| 511 | const u8 *ssid, *p2p; |
| 512 | struct wpa_bss *bss; |
| 513 | |
| 514 | ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); |
| 515 | if (ssid == NULL) { |
| 516 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " |
| 517 | MACSTR, MAC2STR(res->bssid)); |
| 518 | return; |
| 519 | } |
| 520 | if (ssid[1] > 32) { |
| 521 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " |
| 522 | MACSTR, MAC2STR(res->bssid)); |
| 523 | return; |
| 524 | } |
| 525 | |
| 526 | p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 527 | #ifdef CONFIG_P2P |
| 528 | if (p2p == NULL && |
| 529 | wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) { |
| 530 | /* |
| 531 | * If it's a P2P specific interface, then don't update |
| 532 | * the scan result without a P2P IE. |
| 533 | */ |
| 534 | wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR |
| 535 | " update for P2P interface", MAC2STR(res->bssid)); |
| 536 | return; |
| 537 | } |
| 538 | #endif /* CONFIG_P2P */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 539 | if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && |
| 540 | os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) |
| 541 | return; /* Skip P2P listen discovery results here */ |
| 542 | |
| 543 | /* TODO: add option for ignoring BSSes we are not interested in |
| 544 | * (to save memory) */ |
| 545 | bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); |
| 546 | if (bss == NULL) |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 547 | bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 548 | else |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 549 | bss = wpa_bss_update(wpa_s, bss, res); |
| 550 | |
| 551 | if (bss == NULL) |
| 552 | return; |
| 553 | if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) { |
| 554 | struct wpa_bss **n; |
| 555 | unsigned int siz; |
| 556 | if (wpa_s->last_scan_res_size == 0) |
| 557 | siz = 32; |
| 558 | else |
| 559 | siz = wpa_s->last_scan_res_size * 2; |
| 560 | n = os_realloc_array(wpa_s->last_scan_res, siz, |
| 561 | sizeof(struct wpa_bss *)); |
| 562 | if (n == NULL) |
| 563 | return; |
| 564 | wpa_s->last_scan_res = n; |
| 565 | wpa_s->last_scan_res_size = siz; |
| 566 | } |
| 567 | |
| 568 | wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | |
| 572 | static int wpa_bss_included_in_scan(const struct wpa_bss *bss, |
| 573 | const struct scan_info *info) |
| 574 | { |
| 575 | int found; |
| 576 | size_t i; |
| 577 | |
| 578 | if (info == NULL) |
| 579 | return 1; |
| 580 | |
| 581 | if (info->num_freqs) { |
| 582 | found = 0; |
| 583 | for (i = 0; i < info->num_freqs; i++) { |
| 584 | if (bss->freq == info->freqs[i]) { |
| 585 | found = 1; |
| 586 | break; |
| 587 | } |
| 588 | } |
| 589 | if (!found) |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | if (info->num_ssids) { |
| 594 | found = 0; |
| 595 | for (i = 0; i < info->num_ssids; i++) { |
| 596 | const struct wpa_driver_scan_ssid *s = &info->ssids[i]; |
| 597 | if ((s->ssid == NULL || s->ssid_len == 0) || |
| 598 | (s->ssid_len == bss->ssid_len && |
| 599 | os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == |
| 600 | 0)) { |
| 601 | found = 1; |
| 602 | break; |
| 603 | } |
| 604 | } |
| 605 | if (!found) |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | return 1; |
| 610 | } |
| 611 | |
| 612 | |
| 613 | void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, |
| 614 | int new_scan) |
| 615 | { |
| 616 | struct wpa_bss *bss, *n; |
| 617 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 618 | wpa_s->last_scan_full = 0; |
| 619 | os_get_time(&wpa_s->last_scan); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 620 | if (!new_scan) |
| 621 | return; /* do not expire entries without new scan */ |
| 622 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 623 | if (info && !info->aborted && !info->freqs) { |
| 624 | size_t i; |
| 625 | if (info->num_ssids == 0) { |
| 626 | wpa_s->last_scan_full = 1; |
| 627 | } else { |
| 628 | for (i = 0; i < info->num_ssids; i++) { |
| 629 | if (info->ssids[i].ssid == NULL || |
| 630 | info->ssids[i].ssid_len == 0) { |
| 631 | wpa_s->last_scan_full = 1; |
| 632 | break; |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 638 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 639 | if (wpa_bss_in_use(wpa_s, bss)) |
| 640 | continue; |
| 641 | if (!wpa_bss_included_in_scan(bss, info)) |
| 642 | continue; /* expire only BSSes that were scanned */ |
| 643 | if (bss->last_update_idx < wpa_s->bss_update_idx) |
| 644 | bss->scan_miss_count++; |
| 645 | if (bss->scan_miss_count >= |
| 646 | wpa_s->conf->bss_expiration_scan_count) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 647 | wpa_bss_remove(wpa_s, bss, "no match in scan"); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 648 | } |
| 649 | } |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 650 | |
| 651 | wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u " |
| 652 | "last_scan_full=%d", |
| 653 | wpa_s->last_scan_res_used, wpa_s->last_scan_res_size, |
| 654 | wpa_s->last_scan_full); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | |
| 658 | void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) |
| 659 | { |
| 660 | struct wpa_bss *bss, *n; |
| 661 | struct os_time t; |
| 662 | |
| 663 | if (dl_list_empty(&wpa_s->bss)) |
| 664 | return; |
| 665 | |
| 666 | os_get_time(&t); |
| 667 | t.sec -= age; |
| 668 | |
| 669 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 670 | if (wpa_bss_in_use(wpa_s, bss)) |
| 671 | continue; |
| 672 | |
| 673 | if (os_time_before(&bss->last_update, &t)) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 674 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 675 | } else |
| 676 | break; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | |
| 681 | static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx) |
| 682 | { |
| 683 | struct wpa_supplicant *wpa_s = eloop_ctx; |
| 684 | |
| 685 | wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age); |
| 686 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
| 687 | wpa_bss_timeout, wpa_s, NULL); |
| 688 | } |
| 689 | |
| 690 | |
| 691 | int wpa_bss_init(struct wpa_supplicant *wpa_s) |
| 692 | { |
| 693 | dl_list_init(&wpa_s->bss); |
| 694 | dl_list_init(&wpa_s->bss_id); |
| 695 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
| 696 | wpa_bss_timeout, wpa_s, NULL); |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | |
| 701 | void wpa_bss_flush(struct wpa_supplicant *wpa_s) |
| 702 | { |
| 703 | struct wpa_bss *bss, *n; |
| 704 | |
| 705 | if (wpa_s->bss.next == NULL) |
| 706 | return; /* BSS table not yet initialized */ |
| 707 | |
| 708 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 709 | if (wpa_bss_in_use(wpa_s, bss)) |
| 710 | continue; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 711 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 712 | } |
| 713 | } |
| 714 | |
| 715 | |
| 716 | void wpa_bss_deinit(struct wpa_supplicant *wpa_s) |
| 717 | { |
| 718 | eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL); |
| 719 | wpa_bss_flush(wpa_s); |
| 720 | } |
| 721 | |
| 722 | |
| 723 | struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, |
| 724 | const u8 *bssid) |
| 725 | { |
| 726 | struct wpa_bss *bss; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 727 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
| 728 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 729 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 730 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) |
| 731 | return bss; |
| 732 | } |
| 733 | return NULL; |
| 734 | } |
| 735 | |
| 736 | |
Dmitry Shmidt | c5ec7f5 | 2012-03-06 16:33:24 -0800 | [diff] [blame] | 737 | #ifdef CONFIG_P2P |
| 738 | struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, |
| 739 | const u8 *dev_addr) |
| 740 | { |
| 741 | struct wpa_bss *bss; |
| 742 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 743 | u8 addr[ETH_ALEN]; |
| 744 | if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len, |
| 745 | addr) == 0 && |
| 746 | os_memcmp(addr, dev_addr, ETH_ALEN) == 0) |
| 747 | return bss; |
| 748 | } |
| 749 | return NULL; |
| 750 | } |
| 751 | #endif /* CONFIG_P2P */ |
| 752 | |
| 753 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 754 | struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) |
| 755 | { |
| 756 | struct wpa_bss *bss; |
| 757 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 758 | if (bss->id == id) |
| 759 | return bss; |
| 760 | } |
| 761 | return NULL; |
| 762 | } |
| 763 | |
| 764 | |
| 765 | const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) |
| 766 | { |
| 767 | const u8 *end, *pos; |
| 768 | |
| 769 | pos = (const u8 *) (bss + 1); |
| 770 | end = pos + bss->ie_len; |
| 771 | |
| 772 | while (pos + 1 < end) { |
| 773 | if (pos + 2 + pos[1] > end) |
| 774 | break; |
| 775 | if (pos[0] == ie) |
| 776 | return pos; |
| 777 | pos += 2 + pos[1]; |
| 778 | } |
| 779 | |
| 780 | return NULL; |
| 781 | } |
| 782 | |
| 783 | |
| 784 | const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) |
| 785 | { |
| 786 | const u8 *end, *pos; |
| 787 | |
| 788 | pos = (const u8 *) (bss + 1); |
| 789 | end = pos + bss->ie_len; |
| 790 | |
| 791 | while (pos + 1 < end) { |
| 792 | if (pos + 2 + pos[1] > end) |
| 793 | break; |
| 794 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 795 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 796 | return pos; |
| 797 | pos += 2 + pos[1]; |
| 798 | } |
| 799 | |
| 800 | return NULL; |
| 801 | } |
| 802 | |
| 803 | |
| 804 | struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, |
| 805 | u32 vendor_type) |
| 806 | { |
| 807 | struct wpabuf *buf; |
| 808 | const u8 *end, *pos; |
| 809 | |
| 810 | buf = wpabuf_alloc(bss->ie_len); |
| 811 | if (buf == NULL) |
| 812 | return NULL; |
| 813 | |
| 814 | pos = (const u8 *) (bss + 1); |
| 815 | end = pos + bss->ie_len; |
| 816 | |
| 817 | while (pos + 1 < end) { |
| 818 | if (pos + 2 + pos[1] > end) |
| 819 | break; |
| 820 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 821 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 822 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); |
| 823 | pos += 2 + pos[1]; |
| 824 | } |
| 825 | |
| 826 | if (wpabuf_len(buf) == 0) { |
| 827 | wpabuf_free(buf); |
| 828 | buf = NULL; |
| 829 | } |
| 830 | |
| 831 | return buf; |
| 832 | } |
| 833 | |
| 834 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 835 | struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss, |
| 836 | u32 vendor_type) |
| 837 | { |
| 838 | struct wpabuf *buf; |
| 839 | const u8 *end, *pos; |
| 840 | |
| 841 | buf = wpabuf_alloc(bss->beacon_ie_len); |
| 842 | if (buf == NULL) |
| 843 | return NULL; |
| 844 | |
| 845 | pos = (const u8 *) (bss + 1); |
| 846 | pos += bss->ie_len; |
| 847 | end = pos + bss->beacon_ie_len; |
| 848 | |
| 849 | while (pos + 1 < end) { |
| 850 | if (pos + 2 + pos[1] > end) |
| 851 | break; |
| 852 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 853 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 854 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); |
| 855 | pos += 2 + pos[1]; |
| 856 | } |
| 857 | |
| 858 | if (wpabuf_len(buf) == 0) { |
| 859 | wpabuf_free(buf); |
| 860 | buf = NULL; |
| 861 | } |
| 862 | |
| 863 | return buf; |
| 864 | } |
| 865 | |
| 866 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 867 | int wpa_bss_get_max_rate(const struct wpa_bss *bss) |
| 868 | { |
| 869 | int rate = 0; |
| 870 | const u8 *ie; |
| 871 | int i; |
| 872 | |
| 873 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); |
| 874 | for (i = 0; ie && i < ie[1]; i++) { |
| 875 | if ((ie[i + 2] & 0x7f) > rate) |
| 876 | rate = ie[i + 2] & 0x7f; |
| 877 | } |
| 878 | |
| 879 | ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); |
| 880 | for (i = 0; ie && i < ie[1]; i++) { |
| 881 | if ((ie[i + 2] & 0x7f) > rate) |
| 882 | rate = ie[i + 2] & 0x7f; |
| 883 | } |
| 884 | |
| 885 | return rate; |
| 886 | } |
| 887 | |
| 888 | |
| 889 | int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) |
| 890 | { |
| 891 | const u8 *ie, *ie2; |
| 892 | int i, j; |
| 893 | unsigned int len; |
| 894 | u8 *r; |
| 895 | |
| 896 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); |
| 897 | ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); |
| 898 | |
| 899 | len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); |
| 900 | |
| 901 | r = os_malloc(len); |
| 902 | if (!r) |
| 903 | return -1; |
| 904 | |
| 905 | for (i = 0; ie && i < ie[1]; i++) |
| 906 | r[i] = ie[i + 2] & 0x7f; |
| 907 | |
| 908 | for (j = 0; ie2 && j < ie2[1]; j++) |
| 909 | r[i + j] = ie2[j + 2] & 0x7f; |
| 910 | |
| 911 | *rates = r; |
| 912 | return len; |
| 913 | } |