Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * BSS table |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 3 | * Copyright (c) 2009-2012, Jouni Malinen <j@w1.fi> |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 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 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 54 | /** |
| 55 | * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry |
| 56 | * Returns: Allocated ANQP data structure or %NULL on failure |
| 57 | * |
| 58 | * The allocated ANQP data structure has its users count set to 1. It may be |
| 59 | * shared by multiple BSS entries and each shared entry is freed with |
| 60 | * wpa_bss_anqp_free(). |
| 61 | */ |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 62 | struct wpa_bss_anqp * wpa_bss_anqp_alloc(void) |
| 63 | { |
| 64 | struct wpa_bss_anqp *anqp; |
| 65 | anqp = os_zalloc(sizeof(*anqp)); |
| 66 | if (anqp == NULL) |
| 67 | return NULL; |
| 68 | anqp->users = 1; |
| 69 | return anqp; |
| 70 | } |
| 71 | |
| 72 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 73 | /** |
| 74 | * wpa_bss_anqp_clone - Clone an ANQP data structure |
| 75 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() |
| 76 | * Returns: Cloned ANQP data structure or %NULL on failure |
| 77 | */ |
Dmitry Shmidt | d5e4923 | 2012-12-03 15:08:10 -0800 | [diff] [blame] | 78 | static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp) |
| 79 | { |
| 80 | struct wpa_bss_anqp *n; |
| 81 | |
| 82 | n = os_zalloc(sizeof(*n)); |
| 83 | if (n == NULL) |
| 84 | return NULL; |
| 85 | |
| 86 | #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f) |
| 87 | #ifdef CONFIG_INTERWORKING |
| 88 | ANQP_DUP(venue_name); |
| 89 | ANQP_DUP(network_auth_type); |
| 90 | ANQP_DUP(roaming_consortium); |
| 91 | ANQP_DUP(ip_addr_type_availability); |
| 92 | ANQP_DUP(nai_realm); |
| 93 | ANQP_DUP(anqp_3gpp); |
| 94 | ANQP_DUP(domain_name); |
| 95 | #endif /* CONFIG_INTERWORKING */ |
| 96 | #ifdef CONFIG_HS20 |
| 97 | ANQP_DUP(hs20_operator_friendly_name); |
| 98 | ANQP_DUP(hs20_wan_metrics); |
| 99 | ANQP_DUP(hs20_connection_capability); |
| 100 | ANQP_DUP(hs20_operating_class); |
Dmitry Shmidt | f21452a | 2014-02-26 10:55:25 -0800 | [diff] [blame] | 101 | ANQP_DUP(hs20_osu_providers_list); |
Dmitry Shmidt | d5e4923 | 2012-12-03 15:08:10 -0800 | [diff] [blame] | 102 | #endif /* CONFIG_HS20 */ |
| 103 | #undef ANQP_DUP |
| 104 | |
| 105 | return n; |
| 106 | } |
| 107 | |
| 108 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 109 | /** |
| 110 | * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry |
| 111 | * @bss: BSS entry |
| 112 | * Returns: 0 on success, -1 on failure |
| 113 | * |
| 114 | * This function ensures the specific BSS entry has an ANQP data structure that |
| 115 | * is not shared with any other BSS entry. |
| 116 | */ |
Dmitry Shmidt | d5e4923 | 2012-12-03 15:08:10 -0800 | [diff] [blame] | 117 | int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss) |
| 118 | { |
| 119 | struct wpa_bss_anqp *anqp; |
| 120 | |
| 121 | if (bss->anqp && bss->anqp->users > 1) { |
| 122 | /* allocated, but shared - clone an unshared copy */ |
| 123 | anqp = wpa_bss_anqp_clone(bss->anqp); |
| 124 | if (anqp == NULL) |
| 125 | return -1; |
| 126 | anqp->users = 1; |
| 127 | bss->anqp->users--; |
| 128 | bss->anqp = anqp; |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | if (bss->anqp) |
| 133 | return 0; /* already allocated and not shared */ |
| 134 | |
| 135 | /* not allocated - allocate a new storage area */ |
| 136 | bss->anqp = wpa_bss_anqp_alloc(); |
| 137 | return bss->anqp ? 0 : -1; |
| 138 | } |
| 139 | |
| 140 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 141 | /** |
| 142 | * wpa_bss_anqp_free - Free an ANQP data structure |
| 143 | * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone() |
| 144 | */ |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 145 | static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp) |
| 146 | { |
| 147 | if (anqp == NULL) |
| 148 | return; |
| 149 | |
| 150 | anqp->users--; |
| 151 | if (anqp->users > 0) { |
| 152 | /* Another BSS entry holds a pointer to this ANQP info */ |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | #ifdef CONFIG_INTERWORKING |
| 157 | wpabuf_free(anqp->venue_name); |
| 158 | wpabuf_free(anqp->network_auth_type); |
| 159 | wpabuf_free(anqp->roaming_consortium); |
| 160 | wpabuf_free(anqp->ip_addr_type_availability); |
| 161 | wpabuf_free(anqp->nai_realm); |
| 162 | wpabuf_free(anqp->anqp_3gpp); |
| 163 | wpabuf_free(anqp->domain_name); |
| 164 | #endif /* CONFIG_INTERWORKING */ |
| 165 | #ifdef CONFIG_HS20 |
| 166 | wpabuf_free(anqp->hs20_operator_friendly_name); |
| 167 | wpabuf_free(anqp->hs20_wan_metrics); |
| 168 | wpabuf_free(anqp->hs20_connection_capability); |
| 169 | wpabuf_free(anqp->hs20_operating_class); |
Dmitry Shmidt | f21452a | 2014-02-26 10:55:25 -0800 | [diff] [blame] | 170 | wpabuf_free(anqp->hs20_osu_providers_list); |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 171 | #endif /* CONFIG_HS20 */ |
| 172 | |
| 173 | os_free(anqp); |
| 174 | } |
| 175 | |
| 176 | |
Dmitry Shmidt | 2e425d6 | 2014-11-10 11:18:27 -0800 | [diff] [blame] | 177 | static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s, |
| 178 | struct wpa_bss *old_bss, |
| 179 | struct wpa_bss *new_bss) |
| 180 | { |
| 181 | struct wpa_radio_work *work; |
| 182 | struct wpa_connect_work *cwork; |
| 183 | |
| 184 | work = radio_work_pending(wpa_s, "sme-connect"); |
| 185 | if (!work) |
| 186 | work = radio_work_pending(wpa_s, "connect"); |
| 187 | if (!work) |
| 188 | return; |
| 189 | |
| 190 | cwork = work->ctx; |
| 191 | if (cwork->bss != old_bss) |
| 192 | return; |
| 193 | |
| 194 | wpa_printf(MSG_DEBUG, |
| 195 | "Update BSS pointer for the pending connect radio work"); |
| 196 | cwork->bss = new_bss; |
| 197 | if (!new_bss) |
| 198 | cwork->bss_removed = 1; |
| 199 | } |
| 200 | |
| 201 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 202 | static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
| 203 | const char *reason) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 204 | { |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 205 | if (wpa_s->last_scan_res) { |
| 206 | unsigned int i; |
| 207 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { |
| 208 | if (wpa_s->last_scan_res[i] == bss) { |
| 209 | os_memmove(&wpa_s->last_scan_res[i], |
| 210 | &wpa_s->last_scan_res[i + 1], |
| 211 | (wpa_s->last_scan_res_used - i - 1) |
| 212 | * sizeof(struct wpa_bss *)); |
| 213 | wpa_s->last_scan_res_used--; |
| 214 | break; |
| 215 | } |
| 216 | } |
| 217 | } |
Dmitry Shmidt | 2e425d6 | 2014-11-10 11:18:27 -0800 | [diff] [blame] | 218 | wpa_bss_update_pending_connect(wpa_s, bss, NULL); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 219 | dl_list_del(&bss->list); |
| 220 | dl_list_del(&bss->list_id); |
| 221 | wpa_s->num_bss--; |
| 222 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 223 | " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid), |
| 224 | wpa_ssid_txt(bss->ssid, bss->ssid_len), reason); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 225 | wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 226 | wpa_bss_anqp_free(bss->anqp); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 227 | os_free(bss); |
| 228 | } |
| 229 | |
| 230 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 231 | /** |
| 232 | * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID |
| 233 | * @wpa_s: Pointer to wpa_supplicant data |
| 234 | * @bssid: BSSID |
| 235 | * @ssid: SSID |
| 236 | * @ssid_len: Length of @ssid |
| 237 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 238 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 239 | struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, |
| 240 | const u8 *ssid, size_t ssid_len) |
| 241 | { |
| 242 | struct wpa_bss *bss; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 243 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
| 244 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 245 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 246 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && |
| 247 | bss->ssid_len == ssid_len && |
| 248 | os_memcmp(bss->ssid, ssid, ssid_len) == 0) |
| 249 | return bss; |
| 250 | } |
| 251 | return NULL; |
| 252 | } |
| 253 | |
| 254 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 255 | static void calculate_update_time(const struct os_reltime *fetch_time, |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 256 | unsigned int age_ms, |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 257 | struct os_reltime *update_time) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 258 | { |
| 259 | os_time_t usec; |
| 260 | |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 261 | update_time->sec = fetch_time->sec; |
| 262 | update_time->usec = fetch_time->usec; |
| 263 | update_time->sec -= age_ms / 1000; |
| 264 | usec = (age_ms % 1000) * 1000; |
| 265 | if (update_time->usec < usec) { |
| 266 | update_time->sec--; |
| 267 | update_time->usec += 1000000; |
| 268 | } |
| 269 | update_time->usec -= usec; |
| 270 | } |
| 271 | |
| 272 | |
| 273 | static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src, |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 274 | struct os_reltime *fetch_time) |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 275 | { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 276 | dst->flags = src->flags; |
| 277 | os_memcpy(dst->bssid, src->bssid, ETH_ALEN); |
| 278 | dst->freq = src->freq; |
| 279 | dst->beacon_int = src->beacon_int; |
| 280 | dst->caps = src->caps; |
| 281 | dst->qual = src->qual; |
| 282 | dst->noise = src->noise; |
| 283 | dst->level = src->level; |
| 284 | dst->tsf = src->tsf; |
| 285 | |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 286 | calculate_update_time(fetch_time, src->age, &dst->last_update); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 290 | static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
| 291 | { |
| 292 | struct wpa_ssid *ssid; |
| 293 | |
| 294 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
| 295 | if (ssid->ssid == NULL || ssid->ssid_len == 0) |
| 296 | continue; |
| 297 | if (ssid->ssid_len == bss->ssid_len && |
| 298 | os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) |
| 299 | return 1; |
| 300 | } |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 306 | static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) |
| 307 | { |
| 308 | return bss == wpa_s->current_bss || |
Dmitry Shmidt | 6c0da2b | 2015-01-05 13:08:17 -0800 | [diff] [blame^] | 309 | (!is_zero_ether_addr(bss->bssid) && |
| 310 | (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || |
| 311 | os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0)); |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 315 | static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) |
| 316 | { |
| 317 | struct wpa_bss *bss; |
| 318 | |
| 319 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 320 | if (!wpa_bss_known(wpa_s, bss)) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 321 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 322 | return 0; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | return -1; |
| 327 | } |
| 328 | |
| 329 | |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 330 | static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 331 | { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 332 | struct wpa_bss *bss; |
| 333 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 334 | /* |
| 335 | * Remove the oldest entry that does not match with any configured |
| 336 | * network. |
| 337 | */ |
| 338 | if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 339 | return 0; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 340 | |
| 341 | /* |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 342 | * Remove the oldest entry that isn't currently in use. |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 343 | */ |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 344 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 345 | if (!wpa_bss_in_use(wpa_s, bss)) { |
| 346 | wpa_bss_remove(wpa_s, bss, __func__); |
| 347 | return 0; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | return -1; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 355 | static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s, |
| 356 | const u8 *ssid, size_t ssid_len, |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 357 | struct wpa_scan_res *res, |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 358 | struct os_reltime *fetch_time) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 359 | { |
| 360 | struct wpa_bss *bss; |
| 361 | |
| 362 | bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); |
| 363 | if (bss == NULL) |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 364 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 365 | bss->id = wpa_s->bss_next_id++; |
| 366 | bss->last_update_idx = wpa_s->bss_update_idx; |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 367 | wpa_bss_copy_res(bss, res, fetch_time); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 368 | os_memcpy(bss->ssid, ssid, ssid_len); |
| 369 | bss->ssid_len = ssid_len; |
| 370 | bss->ie_len = res->ie_len; |
| 371 | bss->beacon_ie_len = res->beacon_ie_len; |
| 372 | 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] | 373 | wpa_bss_set_hessid(bss); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 374 | |
Jouni Malinen | 7a6c830 | 2013-09-27 15:47:09 +0300 | [diff] [blame] | 375 | if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count && |
| 376 | wpa_bss_remove_oldest(wpa_s) != 0) { |
| 377 | wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d " |
| 378 | "because all BSSes are in use. We should normally " |
| 379 | "not get here!", (int) wpa_s->num_bss + 1); |
| 380 | wpa_s->conf->bss_max_count = wpa_s->num_bss + 1; |
| 381 | } |
| 382 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 383 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
| 384 | dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); |
| 385 | wpa_s->num_bss++; |
| 386 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR |
| 387 | " SSID '%s'", |
| 388 | bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len)); |
| 389 | wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 390 | return bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | |
| 394 | static int are_ies_equal(const struct wpa_bss *old, |
| 395 | const struct wpa_scan_res *new, u32 ie) |
| 396 | { |
| 397 | const u8 *old_ie, *new_ie; |
| 398 | struct wpabuf *old_ie_buff = NULL; |
| 399 | struct wpabuf *new_ie_buff = NULL; |
| 400 | int new_ie_len, old_ie_len, ret, is_multi; |
| 401 | |
| 402 | switch (ie) { |
| 403 | case WPA_IE_VENDOR_TYPE: |
| 404 | old_ie = wpa_bss_get_vendor_ie(old, ie); |
| 405 | new_ie = wpa_scan_get_vendor_ie(new, ie); |
| 406 | is_multi = 0; |
| 407 | break; |
| 408 | case WPS_IE_VENDOR_TYPE: |
| 409 | old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); |
| 410 | new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie); |
| 411 | is_multi = 1; |
| 412 | break; |
| 413 | case WLAN_EID_RSN: |
| 414 | case WLAN_EID_SUPP_RATES: |
| 415 | case WLAN_EID_EXT_SUPP_RATES: |
| 416 | old_ie = wpa_bss_get_ie(old, ie); |
| 417 | new_ie = wpa_scan_get_ie(new, ie); |
| 418 | is_multi = 0; |
| 419 | break; |
| 420 | default: |
| 421 | wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | if (is_multi) { |
| 426 | /* in case of multiple IEs stored in buffer */ |
| 427 | old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; |
| 428 | new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; |
| 429 | old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; |
| 430 | new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; |
| 431 | } else { |
| 432 | /* in case of single IE */ |
| 433 | old_ie_len = old_ie ? old_ie[1] + 2 : 0; |
| 434 | new_ie_len = new_ie ? new_ie[1] + 2 : 0; |
| 435 | } |
| 436 | |
| 437 | if (!old_ie || !new_ie) |
| 438 | ret = !old_ie && !new_ie; |
| 439 | else |
| 440 | ret = (old_ie_len == new_ie_len && |
| 441 | os_memcmp(old_ie, new_ie, old_ie_len) == 0); |
| 442 | |
| 443 | wpabuf_free(old_ie_buff); |
| 444 | wpabuf_free(new_ie_buff); |
| 445 | |
| 446 | return ret; |
| 447 | } |
| 448 | |
| 449 | |
| 450 | static u32 wpa_bss_compare_res(const struct wpa_bss *old, |
| 451 | const struct wpa_scan_res *new) |
| 452 | { |
| 453 | u32 changes = 0; |
| 454 | int caps_diff = old->caps ^ new->caps; |
| 455 | |
| 456 | if (old->freq != new->freq) |
| 457 | changes |= WPA_BSS_FREQ_CHANGED_FLAG; |
| 458 | |
| 459 | if (old->level != new->level) |
| 460 | changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; |
| 461 | |
| 462 | if (caps_diff & IEEE80211_CAP_PRIVACY) |
| 463 | changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; |
| 464 | |
| 465 | if (caps_diff & IEEE80211_CAP_IBSS) |
| 466 | changes |= WPA_BSS_MODE_CHANGED_FLAG; |
| 467 | |
| 468 | if (old->ie_len == new->ie_len && |
| 469 | os_memcmp(old + 1, new + 1, old->ie_len) == 0) |
| 470 | return changes; |
| 471 | changes |= WPA_BSS_IES_CHANGED_FLAG; |
| 472 | |
| 473 | if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE)) |
| 474 | changes |= WPA_BSS_WPAIE_CHANGED_FLAG; |
| 475 | |
| 476 | if (!are_ies_equal(old, new, WLAN_EID_RSN)) |
| 477 | changes |= WPA_BSS_RSNIE_CHANGED_FLAG; |
| 478 | |
| 479 | if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE)) |
| 480 | changes |= WPA_BSS_WPS_CHANGED_FLAG; |
| 481 | |
| 482 | if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) || |
| 483 | !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES)) |
| 484 | changes |= WPA_BSS_RATES_CHANGED_FLAG; |
| 485 | |
| 486 | return changes; |
| 487 | } |
| 488 | |
| 489 | |
| 490 | static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, |
| 491 | const struct wpa_bss *bss) |
| 492 | { |
| 493 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) |
| 494 | wpas_notify_bss_freq_changed(wpa_s, bss->id); |
| 495 | |
| 496 | if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) |
| 497 | wpas_notify_bss_signal_changed(wpa_s, bss->id); |
| 498 | |
| 499 | if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) |
| 500 | wpas_notify_bss_privacy_changed(wpa_s, bss->id); |
| 501 | |
| 502 | if (changes & WPA_BSS_MODE_CHANGED_FLAG) |
| 503 | wpas_notify_bss_mode_changed(wpa_s, bss->id); |
| 504 | |
| 505 | if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) |
| 506 | wpas_notify_bss_wpaie_changed(wpa_s, bss->id); |
| 507 | |
| 508 | if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) |
| 509 | wpas_notify_bss_rsnie_changed(wpa_s, bss->id); |
| 510 | |
| 511 | if (changes & WPA_BSS_WPS_CHANGED_FLAG) |
| 512 | wpas_notify_bss_wps_changed(wpa_s, bss->id); |
| 513 | |
| 514 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
| 515 | wpas_notify_bss_ies_changed(wpa_s, bss->id); |
| 516 | |
| 517 | if (changes & WPA_BSS_RATES_CHANGED_FLAG) |
| 518 | wpas_notify_bss_rates_changed(wpa_s, bss->id); |
Dmitry Shmidt | 661b4f7 | 2014-09-29 14:58:27 -0700 | [diff] [blame] | 519 | |
| 520 | wpas_notify_bss_seen(wpa_s, bss->id); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 524 | static struct wpa_bss * |
| 525 | wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 526 | struct wpa_scan_res *res, struct os_reltime *fetch_time) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 527 | { |
| 528 | u32 changes; |
| 529 | |
| 530 | changes = wpa_bss_compare_res(bss, res); |
| 531 | bss->scan_miss_count = 0; |
| 532 | bss->last_update_idx = wpa_s->bss_update_idx; |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 533 | wpa_bss_copy_res(bss, res, fetch_time); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 534 | /* Move the entry to the end of the list */ |
| 535 | dl_list_del(&bss->list); |
Dmitry Shmidt | 9657139 | 2013-10-14 12:54:46 -0700 | [diff] [blame] | 536 | #ifdef CONFIG_P2P |
| 537 | if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) && |
| 538 | !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) { |
| 539 | /* |
| 540 | * This can happen when non-P2P station interface runs a scan |
| 541 | * without P2P IE in the Probe Request frame. P2P GO would reply |
| 542 | * to that with a Probe Response that does not include P2P IE. |
| 543 | * Do not update the IEs in this BSS entry to avoid such loss of |
| 544 | * information that may be needed for P2P operations to |
| 545 | * determine group information. |
| 546 | */ |
| 547 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for " |
| 548 | MACSTR " since that would remove P2P IE information", |
| 549 | MAC2STR(bss->bssid)); |
| 550 | } else |
| 551 | #endif /* CONFIG_P2P */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 552 | if (bss->ie_len + bss->beacon_ie_len >= |
| 553 | res->ie_len + res->beacon_ie_len) { |
| 554 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); |
| 555 | bss->ie_len = res->ie_len; |
| 556 | bss->beacon_ie_len = res->beacon_ie_len; |
| 557 | } else { |
| 558 | struct wpa_bss *nbss; |
| 559 | struct dl_list *prev = bss->list_id.prev; |
| 560 | dl_list_del(&bss->list_id); |
| 561 | nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + |
| 562 | res->beacon_ie_len); |
| 563 | if (nbss) { |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 564 | unsigned int i; |
| 565 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { |
| 566 | if (wpa_s->last_scan_res[i] == bss) { |
| 567 | wpa_s->last_scan_res[i] = nbss; |
| 568 | break; |
| 569 | } |
| 570 | } |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 571 | if (wpa_s->current_bss == bss) |
| 572 | wpa_s->current_bss = nbss; |
Dmitry Shmidt | 2e425d6 | 2014-11-10 11:18:27 -0800 | [diff] [blame] | 573 | wpa_bss_update_pending_connect(wpa_s, bss, nbss); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 574 | bss = nbss; |
| 575 | os_memcpy(bss + 1, res + 1, |
| 576 | res->ie_len + res->beacon_ie_len); |
| 577 | bss->ie_len = res->ie_len; |
| 578 | bss->beacon_ie_len = res->beacon_ie_len; |
| 579 | } |
| 580 | dl_list_add(prev, &bss->list_id); |
| 581 | } |
Dmitry Shmidt | 4530cfd | 2012-09-09 15:20:40 -0700 | [diff] [blame] | 582 | if (changes & WPA_BSS_IES_CHANGED_FLAG) |
| 583 | wpa_bss_set_hessid(bss); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 584 | dl_list_add_tail(&wpa_s->bss, &bss->list); |
| 585 | |
| 586 | notify_bss_changes(wpa_s, changes, bss); |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 587 | |
| 588 | return bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 592 | /** |
| 593 | * wpa_bss_update_start - Start a BSS table update from scan results |
| 594 | * @wpa_s: Pointer to wpa_supplicant data |
| 595 | * |
| 596 | * This function is called at the start of each BSS table update round for new |
| 597 | * scan results. The actual scan result entries are indicated with calls to |
| 598 | * wpa_bss_update_scan_res() and the update round is finished with a call to |
| 599 | * wpa_bss_update_end(). |
| 600 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 601 | void wpa_bss_update_start(struct wpa_supplicant *wpa_s) |
| 602 | { |
| 603 | wpa_s->bss_update_idx++; |
| 604 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", |
| 605 | wpa_s->bss_update_idx); |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 606 | wpa_s->last_scan_res_used = 0; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 610 | /** |
| 611 | * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result |
| 612 | * @wpa_s: Pointer to wpa_supplicant data |
| 613 | * @res: Scan result |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 614 | * @fetch_time: Time when the result was fetched from the driver |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 615 | * |
| 616 | * This function updates a BSS table entry (or adds one) based on a scan result. |
| 617 | * This is called separately for each scan result between the calls to |
| 618 | * wpa_bss_update_start() and wpa_bss_update_end(). |
| 619 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 620 | void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 621 | struct wpa_scan_res *res, |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 622 | struct os_reltime *fetch_time) |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 623 | { |
Dmitry Shmidt | 6c0da2b | 2015-01-05 13:08:17 -0800 | [diff] [blame^] | 624 | const u8 *ssid, *p2p, *mesh; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 625 | struct wpa_bss *bss; |
| 626 | |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 627 | if (wpa_s->conf->ignore_old_scan_res) { |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 628 | struct os_reltime update; |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 629 | calculate_update_time(fetch_time, res->age, &update); |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 630 | if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) { |
| 631 | struct os_reltime age; |
| 632 | os_reltime_sub(&wpa_s->scan_trigger_time, &update, |
| 633 | &age); |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 634 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS " |
| 635 | "table entry that is %u.%06u seconds older " |
| 636 | "than our scan trigger", |
| 637 | (unsigned int) age.sec, |
| 638 | (unsigned int) age.usec); |
| 639 | return; |
| 640 | } |
| 641 | } |
| 642 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 643 | ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); |
| 644 | if (ssid == NULL) { |
| 645 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " |
| 646 | MACSTR, MAC2STR(res->bssid)); |
| 647 | return; |
| 648 | } |
| 649 | if (ssid[1] > 32) { |
| 650 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " |
| 651 | MACSTR, MAC2STR(res->bssid)); |
| 652 | return; |
| 653 | } |
| 654 | |
| 655 | p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 656 | #ifdef CONFIG_P2P |
| 657 | if (p2p == NULL && |
| 658 | wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) { |
| 659 | /* |
| 660 | * If it's a P2P specific interface, then don't update |
| 661 | * the scan result without a P2P IE. |
| 662 | */ |
| 663 | wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR |
| 664 | " update for P2P interface", MAC2STR(res->bssid)); |
| 665 | return; |
| 666 | } |
| 667 | #endif /* CONFIG_P2P */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 668 | if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && |
| 669 | os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) |
| 670 | return; /* Skip P2P listen discovery results here */ |
| 671 | |
| 672 | /* TODO: add option for ignoring BSSes we are not interested in |
| 673 | * (to save memory) */ |
Dmitry Shmidt | 6c0da2b | 2015-01-05 13:08:17 -0800 | [diff] [blame^] | 674 | |
| 675 | mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID); |
| 676 | if (mesh && mesh[1] <= 32) |
| 677 | ssid = mesh; |
| 678 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 679 | bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); |
| 680 | if (bss == NULL) |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 681 | bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time); |
Dmitry Shmidt | 5605286 | 2013-10-04 10:23:25 -0700 | [diff] [blame] | 682 | else { |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 683 | bss = wpa_bss_update(wpa_s, bss, res, fetch_time); |
Dmitry Shmidt | 5605286 | 2013-10-04 10:23:25 -0700 | [diff] [blame] | 684 | if (wpa_s->last_scan_res) { |
| 685 | unsigned int i; |
| 686 | for (i = 0; i < wpa_s->last_scan_res_used; i++) { |
| 687 | if (bss == wpa_s->last_scan_res[i]) { |
| 688 | /* Already in the list */ |
| 689 | return; |
| 690 | } |
| 691 | } |
| 692 | } |
| 693 | } |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 694 | |
| 695 | if (bss == NULL) |
| 696 | return; |
| 697 | if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) { |
| 698 | struct wpa_bss **n; |
| 699 | unsigned int siz; |
| 700 | if (wpa_s->last_scan_res_size == 0) |
| 701 | siz = 32; |
| 702 | else |
| 703 | siz = wpa_s->last_scan_res_size * 2; |
| 704 | n = os_realloc_array(wpa_s->last_scan_res, siz, |
| 705 | sizeof(struct wpa_bss *)); |
| 706 | if (n == NULL) |
| 707 | return; |
| 708 | wpa_s->last_scan_res = n; |
| 709 | wpa_s->last_scan_res_size = siz; |
| 710 | } |
| 711 | |
Dmitry Shmidt | 7832adb | 2014-04-29 10:53:02 -0700 | [diff] [blame] | 712 | if (wpa_s->last_scan_res) |
| 713 | wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | |
| 717 | static int wpa_bss_included_in_scan(const struct wpa_bss *bss, |
| 718 | const struct scan_info *info) |
| 719 | { |
| 720 | int found; |
| 721 | size_t i; |
| 722 | |
| 723 | if (info == NULL) |
| 724 | return 1; |
| 725 | |
| 726 | if (info->num_freqs) { |
| 727 | found = 0; |
| 728 | for (i = 0; i < info->num_freqs; i++) { |
| 729 | if (bss->freq == info->freqs[i]) { |
| 730 | found = 1; |
| 731 | break; |
| 732 | } |
| 733 | } |
| 734 | if (!found) |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | if (info->num_ssids) { |
| 739 | found = 0; |
| 740 | for (i = 0; i < info->num_ssids; i++) { |
| 741 | const struct wpa_driver_scan_ssid *s = &info->ssids[i]; |
| 742 | if ((s->ssid == NULL || s->ssid_len == 0) || |
| 743 | (s->ssid_len == bss->ssid_len && |
| 744 | os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == |
| 745 | 0)) { |
| 746 | found = 1; |
| 747 | break; |
| 748 | } |
| 749 | } |
| 750 | if (!found) |
| 751 | return 0; |
| 752 | } |
| 753 | |
| 754 | return 1; |
| 755 | } |
| 756 | |
| 757 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 758 | /** |
| 759 | * wpa_bss_update_end - End a BSS table update from scan results |
| 760 | * @wpa_s: Pointer to wpa_supplicant data |
| 761 | * @info: Information about scan parameters |
| 762 | * @new_scan: Whether this update round was based on a new scan |
| 763 | * |
| 764 | * This function is called at the end of each BSS table update round for new |
| 765 | * scan results. The start of the update was indicated with a call to |
| 766 | * wpa_bss_update_start(). |
| 767 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 768 | void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, |
| 769 | int new_scan) |
| 770 | { |
| 771 | struct wpa_bss *bss, *n; |
| 772 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 773 | os_get_reltime(&wpa_s->last_scan); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 774 | if (!new_scan) |
| 775 | return; /* do not expire entries without new scan */ |
| 776 | |
| 777 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 778 | if (wpa_bss_in_use(wpa_s, bss)) |
| 779 | continue; |
| 780 | if (!wpa_bss_included_in_scan(bss, info)) |
| 781 | continue; /* expire only BSSes that were scanned */ |
| 782 | if (bss->last_update_idx < wpa_s->bss_update_idx) |
| 783 | bss->scan_miss_count++; |
| 784 | if (bss->scan_miss_count >= |
| 785 | wpa_s->conf->bss_expiration_scan_count) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 786 | wpa_bss_remove(wpa_s, bss, "no match in scan"); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 787 | } |
| 788 | } |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 789 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 790 | wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u", |
| 791 | wpa_s->last_scan_res_used, wpa_s->last_scan_res_size); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 795 | /** |
| 796 | * wpa_bss_flush_by_age - Flush old BSS entries |
| 797 | * @wpa_s: Pointer to wpa_supplicant data |
| 798 | * @age: Maximum entry age in seconds |
| 799 | * |
| 800 | * Remove BSS entries that have not been updated during the last @age seconds. |
| 801 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 802 | void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) |
| 803 | { |
| 804 | struct wpa_bss *bss, *n; |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 805 | struct os_reltime t; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 806 | |
| 807 | if (dl_list_empty(&wpa_s->bss)) |
| 808 | return; |
| 809 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 810 | os_get_reltime(&t); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 811 | t.sec -= age; |
| 812 | |
| 813 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 814 | if (wpa_bss_in_use(wpa_s, bss)) |
| 815 | continue; |
| 816 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 817 | if (os_reltime_before(&bss->last_update, &t)) { |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 818 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 819 | } else |
| 820 | break; |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | |
| 825 | static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx) |
| 826 | { |
| 827 | struct wpa_supplicant *wpa_s = eloop_ctx; |
| 828 | |
| 829 | wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age); |
| 830 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
| 831 | wpa_bss_timeout, wpa_s, NULL); |
| 832 | } |
| 833 | |
| 834 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 835 | /** |
| 836 | * wpa_bss_init - Initialize BSS table |
| 837 | * @wpa_s: Pointer to wpa_supplicant data |
| 838 | * Returns: 0 on success, -1 on failure |
| 839 | * |
| 840 | * This prepares BSS table lists and timer for periodic updates. The BSS table |
| 841 | * is deinitialized with wpa_bss_deinit() once not needed anymore. |
| 842 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 843 | int wpa_bss_init(struct wpa_supplicant *wpa_s) |
| 844 | { |
| 845 | dl_list_init(&wpa_s->bss); |
| 846 | dl_list_init(&wpa_s->bss_id); |
| 847 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, |
| 848 | wpa_bss_timeout, wpa_s, NULL); |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 853 | /** |
| 854 | * wpa_bss_flush - Flush all unused BSS entries |
| 855 | * @wpa_s: Pointer to wpa_supplicant data |
| 856 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 857 | void wpa_bss_flush(struct wpa_supplicant *wpa_s) |
| 858 | { |
| 859 | struct wpa_bss *bss, *n; |
| 860 | |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 861 | wpa_s->clear_driver_scan_cache = 1; |
| 862 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 863 | if (wpa_s->bss.next == NULL) |
| 864 | return; /* BSS table not yet initialized */ |
| 865 | |
| 866 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { |
| 867 | if (wpa_bss_in_use(wpa_s, bss)) |
| 868 | continue; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 869 | wpa_bss_remove(wpa_s, bss, __func__); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 870 | } |
| 871 | } |
| 872 | |
| 873 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 874 | /** |
| 875 | * wpa_bss_deinit - Deinitialize BSS table |
| 876 | * @wpa_s: Pointer to wpa_supplicant data |
| 877 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 878 | void wpa_bss_deinit(struct wpa_supplicant *wpa_s) |
| 879 | { |
| 880 | eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL); |
| 881 | wpa_bss_flush(wpa_s); |
| 882 | } |
| 883 | |
| 884 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 885 | /** |
| 886 | * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID |
| 887 | * @wpa_s: Pointer to wpa_supplicant data |
| 888 | * @bssid: BSSID |
| 889 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 890 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 891 | struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, |
| 892 | const u8 *bssid) |
| 893 | { |
| 894 | struct wpa_bss *bss; |
Dmitry Shmidt | 0494959 | 2012-07-19 12:16:46 -0700 | [diff] [blame] | 895 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
| 896 | return NULL; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 897 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 898 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) |
| 899 | return bss; |
| 900 | } |
| 901 | return NULL; |
| 902 | } |
| 903 | |
| 904 | |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 905 | /** |
| 906 | * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID |
| 907 | * @wpa_s: Pointer to wpa_supplicant data |
| 908 | * @bssid: BSSID |
| 909 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 910 | * |
| 911 | * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to |
| 912 | * find the entry that has the most recent update. This can help in finding the |
| 913 | * correct entry in cases where the SSID of the AP may have changed recently |
| 914 | * (e.g., in WPS reconfiguration cases). |
| 915 | */ |
| 916 | struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s, |
| 917 | const u8 *bssid) |
| 918 | { |
| 919 | struct wpa_bss *bss, *found = NULL; |
| 920 | if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) |
| 921 | return NULL; |
| 922 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 923 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0) |
| 924 | continue; |
| 925 | if (found == NULL || |
Dmitry Shmidt | fb79edc | 2014-01-10 10:45:54 -0800 | [diff] [blame] | 926 | os_reltime_before(&found->last_update, &bss->last_update)) |
Dmitry Shmidt | 444d567 | 2013-04-01 13:08:44 -0700 | [diff] [blame] | 927 | found = bss; |
| 928 | } |
| 929 | return found; |
| 930 | } |
| 931 | |
| 932 | |
Dmitry Shmidt | c5ec7f5 | 2012-03-06 16:33:24 -0800 | [diff] [blame] | 933 | #ifdef CONFIG_P2P |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 934 | /** |
| 935 | * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr |
| 936 | * @wpa_s: Pointer to wpa_supplicant data |
| 937 | * @dev_addr: P2P Device Address of the GO |
| 938 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 939 | */ |
Dmitry Shmidt | c5ec7f5 | 2012-03-06 16:33:24 -0800 | [diff] [blame] | 940 | struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, |
| 941 | const u8 *dev_addr) |
| 942 | { |
| 943 | struct wpa_bss *bss; |
| 944 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 945 | u8 addr[ETH_ALEN]; |
| 946 | if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len, |
| 947 | addr) == 0 && |
| 948 | os_memcmp(addr, dev_addr, ETH_ALEN) == 0) |
| 949 | return bss; |
| 950 | } |
| 951 | return NULL; |
| 952 | } |
| 953 | #endif /* CONFIG_P2P */ |
| 954 | |
| 955 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 956 | /** |
| 957 | * wpa_bss_get_id - Fetch a BSS table entry based on identifier |
| 958 | * @wpa_s: Pointer to wpa_supplicant data |
| 959 | * @id: Unique identifier (struct wpa_bss::id) assigned for the entry |
| 960 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 961 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 962 | struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) |
| 963 | { |
| 964 | struct wpa_bss *bss; |
| 965 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { |
| 966 | if (bss->id == id) |
| 967 | return bss; |
| 968 | } |
| 969 | return NULL; |
| 970 | } |
| 971 | |
| 972 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 973 | /** |
Dmitry Shmidt | f862328 | 2013-02-20 14:34:59 -0800 | [diff] [blame] | 974 | * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range |
| 975 | * @wpa_s: Pointer to wpa_supplicant data |
| 976 | * @idf: Smallest allowed identifier assigned for the entry |
| 977 | * @idf: Largest allowed identifier assigned for the entry |
| 978 | * Returns: Pointer to the BSS entry or %NULL if not found |
| 979 | * |
| 980 | * This function is similar to wpa_bss_get_id() but allows a BSS entry with the |
| 981 | * smallest id value to be fetched within the specified range without the |
| 982 | * caller having to know the exact id. |
| 983 | */ |
| 984 | struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s, |
| 985 | unsigned int idf, unsigned int idl) |
| 986 | { |
| 987 | struct wpa_bss *bss; |
| 988 | dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) { |
| 989 | if (bss->id >= idf && bss->id <= idl) |
| 990 | return bss; |
| 991 | } |
| 992 | return NULL; |
| 993 | } |
| 994 | |
| 995 | |
| 996 | /** |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 997 | * wpa_bss_get_ie - Fetch a specified information element from a BSS entry |
| 998 | * @bss: BSS table entry |
| 999 | * @ie: Information element identitifier (WLAN_EID_*) |
| 1000 | * Returns: Pointer to the information element (id field) or %NULL if not found |
| 1001 | * |
| 1002 | * This function returns the first matching information element in the BSS |
| 1003 | * entry. |
| 1004 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1005 | const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) |
| 1006 | { |
| 1007 | const u8 *end, *pos; |
| 1008 | |
| 1009 | pos = (const u8 *) (bss + 1); |
| 1010 | end = pos + bss->ie_len; |
| 1011 | |
| 1012 | while (pos + 1 < end) { |
| 1013 | if (pos + 2 + pos[1] > end) |
| 1014 | break; |
| 1015 | if (pos[0] == ie) |
| 1016 | return pos; |
| 1017 | pos += 2 + pos[1]; |
| 1018 | } |
| 1019 | |
| 1020 | return NULL; |
| 1021 | } |
| 1022 | |
| 1023 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1024 | /** |
| 1025 | * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry |
| 1026 | * @bss: BSS table entry |
| 1027 | * @vendor_type: Vendor type (four octets starting the IE payload) |
| 1028 | * Returns: Pointer to the information element (id field) or %NULL if not found |
| 1029 | * |
| 1030 | * This function returns the first matching information element in the BSS |
| 1031 | * entry. |
| 1032 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1033 | const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) |
| 1034 | { |
| 1035 | const u8 *end, *pos; |
| 1036 | |
| 1037 | pos = (const u8 *) (bss + 1); |
| 1038 | end = pos + bss->ie_len; |
| 1039 | |
| 1040 | while (pos + 1 < end) { |
| 1041 | if (pos + 2 + pos[1] > end) |
| 1042 | break; |
| 1043 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 1044 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 1045 | return pos; |
| 1046 | pos += 2 + pos[1]; |
| 1047 | } |
| 1048 | |
| 1049 | return NULL; |
| 1050 | } |
| 1051 | |
| 1052 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1053 | /** |
Dmitry Shmidt | 9657139 | 2013-10-14 12:54:46 -0700 | [diff] [blame] | 1054 | * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry |
| 1055 | * @bss: BSS table entry |
| 1056 | * @vendor_type: Vendor type (four octets starting the IE payload) |
| 1057 | * Returns: Pointer to the information element (id field) or %NULL if not found |
| 1058 | * |
| 1059 | * This function returns the first matching information element in the BSS |
| 1060 | * entry. |
| 1061 | * |
| 1062 | * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only |
| 1063 | * from Beacon frames instead of either Beacon or Probe Response frames. |
| 1064 | */ |
| 1065 | const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss, |
| 1066 | u32 vendor_type) |
| 1067 | { |
| 1068 | const u8 *end, *pos; |
| 1069 | |
| 1070 | if (bss->beacon_ie_len == 0) |
| 1071 | return NULL; |
| 1072 | |
| 1073 | pos = (const u8 *) (bss + 1); |
| 1074 | pos += bss->ie_len; |
| 1075 | end = pos + bss->beacon_ie_len; |
| 1076 | |
| 1077 | while (pos + 1 < end) { |
| 1078 | if (pos + 2 + pos[1] > end) |
| 1079 | break; |
| 1080 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 1081 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 1082 | return pos; |
| 1083 | pos += 2 + pos[1]; |
| 1084 | } |
| 1085 | |
| 1086 | return NULL; |
| 1087 | } |
| 1088 | |
| 1089 | |
| 1090 | /** |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1091 | * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry |
| 1092 | * @bss: BSS table entry |
| 1093 | * @vendor_type: Vendor type (four octets starting the IE payload) |
| 1094 | * Returns: Pointer to the information element payload or %NULL if not found |
| 1095 | * |
| 1096 | * This function returns concatenated payload of possibly fragmented vendor |
| 1097 | * specific information elements in the BSS entry. The caller is responsible for |
| 1098 | * freeing the returned buffer. |
| 1099 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1100 | struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, |
| 1101 | u32 vendor_type) |
| 1102 | { |
| 1103 | struct wpabuf *buf; |
| 1104 | const u8 *end, *pos; |
| 1105 | |
| 1106 | buf = wpabuf_alloc(bss->ie_len); |
| 1107 | if (buf == NULL) |
| 1108 | return NULL; |
| 1109 | |
| 1110 | pos = (const u8 *) (bss + 1); |
| 1111 | end = pos + bss->ie_len; |
| 1112 | |
| 1113 | while (pos + 1 < end) { |
| 1114 | if (pos + 2 + pos[1] > end) |
| 1115 | break; |
| 1116 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 1117 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 1118 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); |
| 1119 | pos += 2 + pos[1]; |
| 1120 | } |
| 1121 | |
| 1122 | if (wpabuf_len(buf) == 0) { |
| 1123 | wpabuf_free(buf); |
| 1124 | buf = NULL; |
| 1125 | } |
| 1126 | |
| 1127 | return buf; |
| 1128 | } |
| 1129 | |
| 1130 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1131 | /** |
| 1132 | * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry |
| 1133 | * @bss: BSS table entry |
| 1134 | * @vendor_type: Vendor type (four octets starting the IE payload) |
| 1135 | * Returns: Pointer to the information element payload or %NULL if not found |
| 1136 | * |
| 1137 | * This function returns concatenated payload of possibly fragmented vendor |
| 1138 | * specific information elements in the BSS entry. The caller is responsible for |
| 1139 | * freeing the returned buffer. |
| 1140 | * |
| 1141 | * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only |
| 1142 | * from Beacon frames instead of either Beacon or Probe Response frames. |
| 1143 | */ |
Dmitry Shmidt | 9bce59c | 2012-09-11 15:06:38 -0700 | [diff] [blame] | 1144 | struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss, |
| 1145 | u32 vendor_type) |
| 1146 | { |
| 1147 | struct wpabuf *buf; |
| 1148 | const u8 *end, *pos; |
| 1149 | |
| 1150 | buf = wpabuf_alloc(bss->beacon_ie_len); |
| 1151 | if (buf == NULL) |
| 1152 | return NULL; |
| 1153 | |
| 1154 | pos = (const u8 *) (bss + 1); |
| 1155 | pos += bss->ie_len; |
| 1156 | end = pos + bss->beacon_ie_len; |
| 1157 | |
| 1158 | while (pos + 1 < end) { |
| 1159 | if (pos + 2 + pos[1] > end) |
| 1160 | break; |
| 1161 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && |
| 1162 | vendor_type == WPA_GET_BE32(&pos[2])) |
| 1163 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); |
| 1164 | pos += 2 + pos[1]; |
| 1165 | } |
| 1166 | |
| 1167 | if (wpabuf_len(buf) == 0) { |
| 1168 | wpabuf_free(buf); |
| 1169 | buf = NULL; |
| 1170 | } |
| 1171 | |
| 1172 | return buf; |
| 1173 | } |
| 1174 | |
| 1175 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1176 | /** |
| 1177 | * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS |
| 1178 | * @bss: BSS table entry |
| 1179 | * Returns: Maximum legacy rate in units of 500 kbps |
| 1180 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1181 | int wpa_bss_get_max_rate(const struct wpa_bss *bss) |
| 1182 | { |
| 1183 | int rate = 0; |
| 1184 | const u8 *ie; |
| 1185 | int i; |
| 1186 | |
| 1187 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); |
| 1188 | for (i = 0; ie && i < ie[1]; i++) { |
| 1189 | if ((ie[i + 2] & 0x7f) > rate) |
| 1190 | rate = ie[i + 2] & 0x7f; |
| 1191 | } |
| 1192 | |
| 1193 | ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); |
| 1194 | for (i = 0; ie && i < ie[1]; i++) { |
| 1195 | if ((ie[i + 2] & 0x7f) > rate) |
| 1196 | rate = ie[i + 2] & 0x7f; |
| 1197 | } |
| 1198 | |
| 1199 | return rate; |
| 1200 | } |
| 1201 | |
| 1202 | |
Dmitry Shmidt | a54fa5f | 2013-01-15 13:53:35 -0800 | [diff] [blame] | 1203 | /** |
| 1204 | * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS |
| 1205 | * @bss: BSS table entry |
| 1206 | * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps) |
| 1207 | * Returns: number of legacy TX rates or -1 on failure |
| 1208 | * |
| 1209 | * The caller is responsible for freeing the returned buffer with os_free() in |
| 1210 | * case of success. |
| 1211 | */ |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1212 | int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) |
| 1213 | { |
| 1214 | const u8 *ie, *ie2; |
| 1215 | int i, j; |
| 1216 | unsigned int len; |
| 1217 | u8 *r; |
| 1218 | |
| 1219 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); |
| 1220 | ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); |
| 1221 | |
| 1222 | len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); |
| 1223 | |
| 1224 | r = os_malloc(len); |
| 1225 | if (!r) |
| 1226 | return -1; |
| 1227 | |
| 1228 | for (i = 0; ie && i < ie[1]; i++) |
| 1229 | r[i] = ie[i + 2] & 0x7f; |
| 1230 | |
| 1231 | for (j = 0; ie2 && j < ie2[1]; j++) |
| 1232 | r[i + j] = ie2[j + 2] & 0x7f; |
| 1233 | |
| 1234 | *rates = r; |
| 1235 | return len; |
| 1236 | } |