/*
* BSS table
- * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2009-2015, Jouni Malinen <j@w1.fi>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
#include "utils/includes.h"
#include "bss.h"
+#define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
+#define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
+#define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
+#define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
+#define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
+#define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
+#define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
+#define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
+#define WPA_BSS_IES_CHANGED_FLAG BIT(8)
+
+
+static void wpa_bss_set_hessid(struct wpa_bss *bss)
+{
+#ifdef CONFIG_INTERWORKING
+ const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
+ if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
+ os_memset(bss->hessid, 0, ETH_ALEN);
+ return;
+ }
+ if (ie[1] == 7)
+ os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
+ else
+ os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
+#endif /* CONFIG_INTERWORKING */
+}
+
+
/**
- * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
+ * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
+ * Returns: Allocated ANQP data structure or %NULL on failure
+ *
+ * The allocated ANQP data structure has its users count set to 1. It may be
+ * shared by multiple BSS entries and each shared entry is freed with
+ * wpa_bss_anqp_free().
*/
-#define WPA_BSS_EXPIRATION_PERIOD 10
+struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
+{
+ struct wpa_bss_anqp *anqp;
+ anqp = os_zalloc(sizeof(*anqp));
+ if (anqp == NULL)
+ return NULL;
+ anqp->users = 1;
+ return anqp;
+}
+
/**
- * WPA_BSS_EXPIRATION_AGE - BSS entry age after which it can be expired
- *
- * This value control the time in seconds after which a BSS entry gets removed
- * if it has not been updated or is not in use.
+ * wpa_bss_anqp_clone - Clone an ANQP data structure
+ * @anqp: ANQP data structure from wpa_bss_anqp_alloc()
+ * Returns: Cloned ANQP data structure or %NULL on failure
*/
-#define WPA_BSS_EXPIRATION_AGE 180
+static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
+{
+ struct wpa_bss_anqp *n;
+
+ n = os_zalloc(sizeof(*n));
+ if (n == NULL)
+ return NULL;
+
+#define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f)
+#ifdef CONFIG_INTERWORKING
+ ANQP_DUP(capability_list);
+ ANQP_DUP(venue_name);
+ ANQP_DUP(network_auth_type);
+ ANQP_DUP(roaming_consortium);
+ ANQP_DUP(ip_addr_type_availability);
+ ANQP_DUP(nai_realm);
+ ANQP_DUP(anqp_3gpp);
+ ANQP_DUP(domain_name);
+#endif /* CONFIG_INTERWORKING */
+#ifdef CONFIG_HS20
+ ANQP_DUP(hs20_capability_list);
+ ANQP_DUP(hs20_operator_friendly_name);
+ ANQP_DUP(hs20_wan_metrics);
+ ANQP_DUP(hs20_connection_capability);
+ ANQP_DUP(hs20_operating_class);
+ ANQP_DUP(hs20_osu_providers_list);
+#endif /* CONFIG_HS20 */
+#undef ANQP_DUP
+
+ return n;
+}
+
/**
- * WPA_BSS_EXPIRATION_SCAN_COUNT - Expire BSS after number of scans
+ * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
+ * @bss: BSS entry
+ * Returns: 0 on success, -1 on failure
*
- * If the BSS entry has not been seen in this many scans, it will be removed.
- * Value 1 means that the entry is removed after the first scan without the
- * BSSID being seen. Larger values can be used to avoid BSS entries
- * disappearing if they are not visible in every scan (e.g., low signal quality
- * or interference).
+ * This function ensures the specific BSS entry has an ANQP data structure that
+ * is not shared with any other BSS entry.
*/
-#define WPA_BSS_EXPIRATION_SCAN_COUNT 2
+int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
+{
+ struct wpa_bss_anqp *anqp;
+
+ if (bss->anqp && bss->anqp->users > 1) {
+ /* allocated, but shared - clone an unshared copy */
+ anqp = wpa_bss_anqp_clone(bss->anqp);
+ if (anqp == NULL)
+ return -1;
+ anqp->users = 1;
+ bss->anqp->users--;
+ bss->anqp = anqp;
+ return 0;
+ }
-#define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
-#define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
-#define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
-#define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
-#define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
-#define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
-#define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
-#define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
-#define WPA_BSS_IES_CHANGED_FLAG BIT(8)
+ if (bss->anqp)
+ return 0; /* already allocated and not shared */
+
+ /* not allocated - allocate a new storage area */
+ bss->anqp = wpa_bss_anqp_alloc();
+ return bss->anqp ? 0 : -1;
+}
+
+
+/**
+ * wpa_bss_anqp_free - Free an ANQP data structure
+ * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
+ */
+static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
+{
+ if (anqp == NULL)
+ return;
+
+ anqp->users--;
+ if (anqp->users > 0) {
+ /* Another BSS entry holds a pointer to this ANQP info */
+ return;
+ }
+
+#ifdef CONFIG_INTERWORKING
+ wpabuf_free(anqp->capability_list);
+ wpabuf_free(anqp->venue_name);
+ wpabuf_free(anqp->network_auth_type);
+ wpabuf_free(anqp->roaming_consortium);
+ wpabuf_free(anqp->ip_addr_type_availability);
+ wpabuf_free(anqp->nai_realm);
+ wpabuf_free(anqp->anqp_3gpp);
+ wpabuf_free(anqp->domain_name);
+#endif /* CONFIG_INTERWORKING */
+#ifdef CONFIG_HS20
+ wpabuf_free(anqp->hs20_capability_list);
+ wpabuf_free(anqp->hs20_operator_friendly_name);
+ wpabuf_free(anqp->hs20_wan_metrics);
+ wpabuf_free(anqp->hs20_connection_capability);
+ wpabuf_free(anqp->hs20_operating_class);
+ wpabuf_free(anqp->hs20_osu_providers_list);
+#endif /* CONFIG_HS20 */
+
+ os_free(anqp);
+}
+
+
+static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s,
+ struct wpa_bss *old_bss,
+ struct wpa_bss *new_bss)
+{
+ struct wpa_radio_work *work;
+ struct wpa_connect_work *cwork;
+
+ work = radio_work_pending(wpa_s, "sme-connect");
+ if (!work)
+ work = radio_work_pending(wpa_s, "connect");
+ if (!work)
+ return;
+
+ cwork = work->ctx;
+ if (cwork->bss != old_bss)
+ return;
+
+ wpa_printf(MSG_DEBUG,
+ "Update BSS pointer for the pending connect radio work");
+ cwork->bss = new_bss;
+ if (!new_bss)
+ cwork->bss_removed = 1;
+}
-static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
+ const char *reason)
{
+ if (wpa_s->last_scan_res) {
+ unsigned int i;
+ for (i = 0; i < wpa_s->last_scan_res_used; i++) {
+ if (wpa_s->last_scan_res[i] == bss) {
+ os_memmove(&wpa_s->last_scan_res[i],
+ &wpa_s->last_scan_res[i + 1],
+ (wpa_s->last_scan_res_used - i - 1)
+ * sizeof(struct wpa_bss *));
+ wpa_s->last_scan_res_used--;
+ break;
+ }
+ }
+ }
+ wpa_bss_update_pending_connect(wpa_s, bss, NULL);
dl_list_del(&bss->list);
dl_list_del(&bss->list_id);
wpa_s->num_bss--;
- wpa_printf(MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR " SSID '%s'",
- bss->id, MAC2STR(bss->bssid),
- wpa_ssid_txt(bss->ssid, bss->ssid_len));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
+ " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
+ wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
+ wpa_bss_anqp_free(bss->anqp);
os_free(bss);
}
+/**
+ * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID
+ * @ssid: SSID
+ * @ssid_len: Length of @ssid
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ */
struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
const u8 *ssid, size_t ssid_len)
{
struct wpa_bss *bss;
+ if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
+ return NULL;
dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
bss->ssid_len == ssid_len &&
}
-static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
+static void calculate_update_time(const struct os_reltime *fetch_time,
+ unsigned int age_ms,
+ struct os_reltime *update_time)
{
os_time_t usec;
+ update_time->sec = fetch_time->sec;
+ update_time->usec = fetch_time->usec;
+ update_time->sec -= age_ms / 1000;
+ usec = (age_ms % 1000) * 1000;
+ if (update_time->usec < usec) {
+ update_time->sec--;
+ update_time->usec += 1000000;
+ }
+ update_time->usec -= usec;
+}
+
+
+static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
+ struct os_reltime *fetch_time)
+{
dst->flags = src->flags;
os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
dst->freq = src->freq;
dst->noise = src->noise;
dst->level = src->level;
dst->tsf = src->tsf;
+ dst->est_throughput = src->est_throughput;
+ dst->snr = src->snr;
+
+ calculate_update_time(fetch_time, src->age, &dst->last_update);
+}
+
+
+static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ struct wpa_ssid *ssid;
+
+ for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+ if (ssid->ssid == NULL || ssid->ssid_len == 0)
+ continue;
+ if (ssid->ssid_len == bss->ssid_len &&
+ os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
- os_get_time(&dst->last_update);
- dst->last_update.sec -= src->age / 1000;
- usec = (src->age % 1000) * 1000;
- if (dst->last_update.usec < usec) {
- dst->last_update.sec--;
- dst->last_update.usec += 1000000;
+static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ if (bss == wpa_s->current_bss)
+ return 1;
+
+ if (wpa_s->current_bss &&
+ (bss->ssid_len != wpa_s->current_bss->ssid_len ||
+ os_memcmp(bss->ssid, wpa_s->current_bss->ssid,
+ bss->ssid_len) != 0))
+ return 0; /* SSID has changed */
+
+ return !is_zero_ether_addr(bss->bssid) &&
+ (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
+ os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0);
+}
+
+
+static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_bss *bss;
+
+ dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (!wpa_bss_known(wpa_s, bss)) {
+ wpa_bss_remove(wpa_s, bss, __func__);
+ return 0;
+ }
}
- dst->last_update.usec -= usec;
+
+ return -1;
}
-static void wpa_bss_add(struct wpa_supplicant *wpa_s,
- const u8 *ssid, size_t ssid_len,
- struct wpa_scan_res *res)
+static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_bss *bss;
+
+ /*
+ * Remove the oldest entry that does not match with any configured
+ * network.
+ */
+ if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
+ return 0;
+
+ /*
+ * Remove the oldest entry that isn't currently in use.
+ */
+ dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (!wpa_bss_in_use(wpa_s, bss)) {
+ wpa_bss_remove(wpa_s, bss, __func__);
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+
+static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
+ const u8 *ssid, size_t ssid_len,
+ struct wpa_scan_res *res,
+ struct os_reltime *fetch_time)
{
struct wpa_bss *bss;
bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
if (bss == NULL)
- return;
+ return NULL;
bss->id = wpa_s->bss_next_id++;
bss->last_update_idx = wpa_s->bss_update_idx;
- wpa_bss_copy_res(bss, res);
+ wpa_bss_copy_res(bss, res, fetch_time);
os_memcpy(bss->ssid, ssid, ssid_len);
bss->ssid_len = ssid_len;
bss->ie_len = res->ie_len;
bss->beacon_ie_len = res->beacon_ie_len;
os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
+ wpa_bss_set_hessid(bss);
+
+ if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
+ wpa_bss_remove_oldest(wpa_s) != 0) {
+ wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
+ "because all BSSes are in use. We should normally "
+ "not get here!", (int) wpa_s->num_bss + 1);
+ wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
+ }
dl_list_add_tail(&wpa_s->bss, &bss->list);
dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
wpa_s->num_bss++;
- wpa_printf(MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR " SSID '%s'",
- bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
+ " SSID '%s' freq %d",
+ bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len),
+ bss->freq);
wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
- if (wpa_s->num_bss > wpa_s->conf->bss_max_count) {
- /* Remove the oldest entry */
- wpa_bss_remove(wpa_s, dl_list_first(&wpa_s->bss,
- struct wpa_bss, list));
- }
+ return bss;
}
static int are_ies_equal(const struct wpa_bss *old,
- const struct wpa_scan_res *new, u32 ie)
+ const struct wpa_scan_res *new_res, u32 ie)
{
const u8 *old_ie, *new_ie;
struct wpabuf *old_ie_buff = NULL;
switch (ie) {
case WPA_IE_VENDOR_TYPE:
old_ie = wpa_bss_get_vendor_ie(old, ie);
- new_ie = wpa_scan_get_vendor_ie(new, ie);
+ new_ie = wpa_scan_get_vendor_ie(new_res, ie);
is_multi = 0;
break;
case WPS_IE_VENDOR_TYPE:
old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
- new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
+ new_ie_buff = wpa_scan_get_vendor_ie_multi(new_res, ie);
is_multi = 1;
break;
case WLAN_EID_RSN:
case WLAN_EID_SUPP_RATES:
case WLAN_EID_EXT_SUPP_RATES:
old_ie = wpa_bss_get_ie(old, ie);
- new_ie = wpa_scan_get_ie(new, ie);
+ new_ie = wpa_scan_get_ie(new_res, ie);
is_multi = 0;
break;
default:
new_ie_len = new_ie ? new_ie[1] + 2 : 0;
}
- ret = (old_ie_len == new_ie_len &&
- os_memcmp(old_ie, new_ie, old_ie_len) == 0);
+ if (!old_ie || !new_ie)
+ ret = !old_ie && !new_ie;
+ else
+ ret = (old_ie_len == new_ie_len &&
+ os_memcmp(old_ie, new_ie, old_ie_len) == 0);
wpabuf_free(old_ie_buff);
wpabuf_free(new_ie_buff);
static u32 wpa_bss_compare_res(const struct wpa_bss *old,
- const struct wpa_scan_res *new)
+ const struct wpa_scan_res *new_res)
{
u32 changes = 0;
- int caps_diff = old->caps ^ new->caps;
+ int caps_diff = old->caps ^ new_res->caps;
- if (old->freq != new->freq)
+ if (old->freq != new_res->freq)
changes |= WPA_BSS_FREQ_CHANGED_FLAG;
- if (old->level != new->level)
+ if (old->level != new_res->level)
changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
if (caps_diff & IEEE80211_CAP_PRIVACY)
if (caps_diff & IEEE80211_CAP_IBSS)
changes |= WPA_BSS_MODE_CHANGED_FLAG;
- if (old->ie_len == new->ie_len &&
- os_memcmp(old + 1, new + 1, old->ie_len) == 0)
+ if (old->ie_len == new_res->ie_len &&
+ os_memcmp(old + 1, new_res + 1, old->ie_len) == 0)
return changes;
changes |= WPA_BSS_IES_CHANGED_FLAG;
- if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
+ if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE))
changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
- if (!are_ies_equal(old, new, WLAN_EID_RSN))
+ if (!are_ies_equal(old, new_res, WLAN_EID_RSN))
changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
- if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
+ if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE))
changes |= WPA_BSS_WPS_CHANGED_FLAG;
- if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
- !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
+ if (!are_ies_equal(old, new_res, WLAN_EID_SUPP_RATES) ||
+ !are_ies_equal(old, new_res, WLAN_EID_EXT_SUPP_RATES))
changes |= WPA_BSS_RATES_CHANGED_FLAG;
return changes;
if (changes & WPA_BSS_RATES_CHANGED_FLAG)
wpas_notify_bss_rates_changed(wpa_s, bss->id);
+
+ wpas_notify_bss_seen(wpa_s, bss->id);
}
-static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
- struct wpa_scan_res *res)
+static struct wpa_bss *
+wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
+ struct wpa_scan_res *res, struct os_reltime *fetch_time)
{
u32 changes;
changes = wpa_bss_compare_res(bss, res);
+ if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
+ wpa_printf(MSG_DEBUG, "BSS: " MACSTR " changed freq %d --> %d",
+ MAC2STR(bss->bssid), bss->freq, res->freq);
bss->scan_miss_count = 0;
bss->last_update_idx = wpa_s->bss_update_idx;
- wpa_bss_copy_res(bss, res);
+ wpa_bss_copy_res(bss, res, fetch_time);
/* Move the entry to the end of the list */
dl_list_del(&bss->list);
+#ifdef CONFIG_P2P
+ if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
+ !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
+ /*
+ * This can happen when non-P2P station interface runs a scan
+ * without P2P IE in the Probe Request frame. P2P GO would reply
+ * to that with a Probe Response that does not include P2P IE.
+ * Do not update the IEs in this BSS entry to avoid such loss of
+ * information that may be needed for P2P operations to
+ * determine group information.
+ */
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
+ MACSTR " since that would remove P2P IE information",
+ MAC2STR(bss->bssid));
+ } else
+#endif /* CONFIG_P2P */
if (bss->ie_len + bss->beacon_ie_len >=
res->ie_len + res->beacon_ie_len) {
os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
res->beacon_ie_len);
if (nbss) {
+ unsigned int i;
+ for (i = 0; i < wpa_s->last_scan_res_used; i++) {
+ if (wpa_s->last_scan_res[i] == bss) {
+ wpa_s->last_scan_res[i] = nbss;
+ break;
+ }
+ }
+ if (wpa_s->current_bss == bss)
+ wpa_s->current_bss = nbss;
+ wpa_bss_update_pending_connect(wpa_s, bss, nbss);
bss = nbss;
os_memcpy(bss + 1, res + 1,
res->ie_len + res->beacon_ie_len);
}
dl_list_add(prev, &bss->list_id);
}
+ if (changes & WPA_BSS_IES_CHANGED_FLAG)
+ wpa_bss_set_hessid(bss);
dl_list_add_tail(&wpa_s->bss, &bss->list);
notify_bss_changes(wpa_s, changes, bss);
-}
-
-static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
-{
- return bss == wpa_s->current_bss ||
- os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
- os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
+ return bss;
}
+/**
+ * wpa_bss_update_start - Start a BSS table update from scan results
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is called at the start of each BSS table update round for new
+ * scan results. The actual scan result entries are indicated with calls to
+ * wpa_bss_update_scan_res() and the update round is finished with a call to
+ * wpa_bss_update_end().
+ */
void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
{
wpa_s->bss_update_idx++;
- wpa_printf(MSG_DEBUG, "BSS: Start scan result update %u",
- wpa_s->bss_update_idx);
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
+ wpa_s->bss_update_idx);
+ wpa_s->last_scan_res_used = 0;
}
+/**
+ * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @res: Scan result
+ * @fetch_time: Time when the result was fetched from the driver
+ *
+ * This function updates a BSS table entry (or adds one) based on a scan result.
+ * This is called separately for each scan result between the calls to
+ * wpa_bss_update_start() and wpa_bss_update_end().
+ */
void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
- struct wpa_scan_res *res)
+ struct wpa_scan_res *res,
+ struct os_reltime *fetch_time)
{
- const u8 *ssid, *p2p;
+ const u8 *ssid, *p2p, *mesh;
struct wpa_bss *bss;
+ if (wpa_s->conf->ignore_old_scan_res) {
+ struct os_reltime update;
+ calculate_update_time(fetch_time, res->age, &update);
+ if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
+ struct os_reltime age;
+ os_reltime_sub(&wpa_s->scan_trigger_time, &update,
+ &age);
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
+ "table entry that is %u.%06u seconds older "
+ "than our scan trigger",
+ (unsigned int) age.sec,
+ (unsigned int) age.usec);
+ return;
+ }
+ }
+
ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
if (ssid == NULL) {
- wpa_printf(MSG_DEBUG, "BSS: No SSID IE included for " MACSTR,
- MAC2STR(res->bssid));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
+ MACSTR, MAC2STR(res->bssid));
return;
}
- if (ssid[1] > 32) {
- wpa_printf(MSG_DEBUG, "BSS: Too long SSID IE included for "
- MACSTR, MAC2STR(res->bssid));
+ if (ssid[1] > SSID_MAX_LEN) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
+ MACSTR, MAC2STR(res->bssid));
return;
}
p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
+#ifdef CONFIG_P2P
+ if (p2p == NULL &&
+ wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
+ /*
+ * If it's a P2P specific interface, then don't update
+ * the scan result without a P2P IE.
+ */
+ wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
+ " update for P2P interface", MAC2STR(res->bssid));
+ return;
+ }
+#endif /* CONFIG_P2P */
if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
return; /* Skip P2P listen discovery results here */
/* TODO: add option for ignoring BSSes we are not interested in
* (to save memory) */
+
+ mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
+ if (mesh && mesh[1] <= SSID_MAX_LEN)
+ ssid = mesh;
+
bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
if (bss == NULL)
- wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
- else
- wpa_bss_update(wpa_s, bss, res);
+ bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
+ else {
+ bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
+ if (wpa_s->last_scan_res) {
+ unsigned int i;
+ for (i = 0; i < wpa_s->last_scan_res_used; i++) {
+ if (bss == wpa_s->last_scan_res[i]) {
+ /* Already in the list */
+ return;
+ }
+ }
+ }
+ }
+
+ if (bss == NULL)
+ return;
+ if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
+ struct wpa_bss **n;
+ unsigned int siz;
+ if (wpa_s->last_scan_res_size == 0)
+ siz = 32;
+ else
+ siz = wpa_s->last_scan_res_size * 2;
+ n = os_realloc_array(wpa_s->last_scan_res, siz,
+ sizeof(struct wpa_bss *));
+ if (n == NULL)
+ return;
+ wpa_s->last_scan_res = n;
+ wpa_s->last_scan_res_size = siz;
+ }
+
+ if (wpa_s->last_scan_res)
+ wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
}
}
+/**
+ * wpa_bss_update_end - End a BSS table update from scan results
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @info: Information about scan parameters
+ * @new_scan: Whether this update round was based on a new scan
+ *
+ * This function is called at the end of each BSS table update round for new
+ * scan results. The start of the update was indicated with a call to
+ * wpa_bss_update_start().
+ */
void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
int new_scan)
{
struct wpa_bss *bss, *n;
+ os_get_reltime(&wpa_s->last_scan);
if (!new_scan)
return; /* do not expire entries without new scan */
continue; /* expire only BSSes that were scanned */
if (bss->last_update_idx < wpa_s->bss_update_idx)
bss->scan_miss_count++;
- if (bss->scan_miss_count >= WPA_BSS_EXPIRATION_SCAN_COUNT) {
- wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to no "
- "match in scan", bss->id);
- wpa_bss_remove(wpa_s, bss);
+ if (bss->scan_miss_count >=
+ wpa_s->conf->bss_expiration_scan_count) {
+ wpa_bss_remove(wpa_s, bss, "no match in scan");
}
}
+
+ wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
+ wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
}
-static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
+/**
+ * wpa_bss_flush_by_age - Flush old BSS entries
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @age: Maximum entry age in seconds
+ *
+ * Remove BSS entries that have not been updated during the last @age seconds.
+ */
+void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
{
- struct wpa_supplicant *wpa_s = eloop_ctx;
struct wpa_bss *bss, *n;
- struct os_time t;
+ struct os_reltime t;
if (dl_list_empty(&wpa_s->bss))
return;
- os_get_time(&t);
- t.sec -= WPA_BSS_EXPIRATION_AGE;
+ os_get_reltime(&t);
+ t.sec -= age;
dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
if (wpa_bss_in_use(wpa_s, bss))
continue;
- if (os_time_before(&bss->last_update, &t)) {
- wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to age",
- bss->id);
- wpa_bss_remove(wpa_s, bss);
+ if (os_reltime_before(&bss->last_update, &t)) {
+ wpa_bss_remove(wpa_s, bss, __func__);
} else
break;
}
- eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
- wpa_bss_timeout, wpa_s, NULL);
}
+/**
+ * wpa_bss_init - Initialize BSS table
+ * @wpa_s: Pointer to wpa_supplicant data
+ * Returns: 0 on success, -1 on failure
+ *
+ * This prepares BSS table lists and timer for periodic updates. The BSS table
+ * is deinitialized with wpa_bss_deinit() once not needed anymore.
+ */
int wpa_bss_init(struct wpa_supplicant *wpa_s)
{
dl_list_init(&wpa_s->bss);
dl_list_init(&wpa_s->bss_id);
- eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
- wpa_bss_timeout, wpa_s, NULL);
return 0;
}
-void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
+/**
+ * wpa_bss_flush - Flush all unused BSS entries
+ * @wpa_s: Pointer to wpa_supplicant data
+ */
+void wpa_bss_flush(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss, *n;
- eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
+
+ wpa_s->clear_driver_scan_cache = 1;
+
if (wpa_s->bss.next == NULL)
return; /* BSS table not yet initialized */
- dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list)
- wpa_bss_remove(wpa_s, bss);
+
+ dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
+ if (wpa_bss_in_use(wpa_s, bss))
+ continue;
+ wpa_bss_remove(wpa_s, bss, __func__);
+ }
+}
+
+
+/**
+ * wpa_bss_deinit - Deinitialize BSS table
+ * @wpa_s: Pointer to wpa_supplicant data
+ */
+void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
+{
+ wpa_bss_flush(wpa_s);
}
+/**
+ * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ */
struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
const u8 *bssid)
{
struct wpa_bss *bss;
- dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
+ return NULL;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
return bss;
}
}
+/**
+ * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ *
+ * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
+ * find the entry that has the most recent update. This can help in finding the
+ * correct entry in cases where the SSID of the AP may have changed recently
+ * (e.g., in WPS reconfiguration cases).
+ */
+struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
+ const u8 *bssid)
+{
+ struct wpa_bss *bss, *found = NULL;
+ if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
+ return NULL;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
+ continue;
+ if (found == NULL ||
+ os_reltime_before(&found->last_update, &bss->last_update))
+ found = bss;
+ }
+ return found;
+}
+
+
+#ifdef CONFIG_P2P
+/**
+ * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @dev_addr: P2P Device Address of the GO
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ */
+struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
+ const u8 *dev_addr)
+{
+ struct wpa_bss *bss;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
+ u8 addr[ETH_ALEN];
+ if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
+ addr) == 0 &&
+ os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
+ return bss;
+ }
+ return NULL;
+}
+#endif /* CONFIG_P2P */
+
+
+/**
+ * wpa_bss_get_id - Fetch a BSS table entry based on identifier
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ */
struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
{
struct wpa_bss *bss;
}
+/**
+ * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @idf: Smallest allowed identifier assigned for the entry
+ * @idf: Largest allowed identifier assigned for the entry
+ * Returns: Pointer to the BSS entry or %NULL if not found
+ *
+ * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
+ * smallest id value to be fetched within the specified range without the
+ * caller having to know the exact id.
+ */
+struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
+ unsigned int idf, unsigned int idl)
+{
+ struct wpa_bss *bss;
+ dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
+ if (bss->id >= idf && bss->id <= idl)
+ return bss;
+ }
+ return NULL;
+}
+
+
+/**
+ * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
+ * @bss: BSS table entry
+ * @ie: Information element identitifier (WLAN_EID_*)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the BSS
+ * entry.
+ */
const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
{
const u8 *end, *pos;
}
+/**
+ * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
+ * @bss: BSS table entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the BSS
+ * entry.
+ */
const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
{
const u8 *end, *pos;
}
+/**
+ * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
+ * @bss: BSS table entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the BSS
+ * entry.
+ *
+ * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
+ * from Beacon frames instead of either Beacon or Probe Response frames.
+ */
+const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
+ u32 vendor_type)
+{
+ const u8 *end, *pos;
+
+ if (bss->beacon_ie_len == 0)
+ return NULL;
+
+ pos = (const u8 *) (bss + 1);
+ pos += bss->ie_len;
+ end = pos + bss->beacon_ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+ vendor_type == WPA_GET_BE32(&pos[2]))
+ return pos;
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+
+/**
+ * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
+ * @bss: BSS table entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element payload or %NULL if not found
+ *
+ * This function returns concatenated payload of possibly fragmented vendor
+ * specific information elements in the BSS entry. The caller is responsible for
+ * freeing the returned buffer.
+ */
struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
u32 vendor_type)
{
}
+/**
+ * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
+ * @bss: BSS table entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element payload or %NULL if not found
+ *
+ * This function returns concatenated payload of possibly fragmented vendor
+ * specific information elements in the BSS entry. The caller is responsible for
+ * freeing the returned buffer.
+ *
+ * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
+ * from Beacon frames instead of either Beacon or Probe Response frames.
+ */
+struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
+ u32 vendor_type)
+{
+ struct wpabuf *buf;
+ const u8 *end, *pos;
+
+ buf = wpabuf_alloc(bss->beacon_ie_len);
+ if (buf == NULL)
+ return NULL;
+
+ pos = (const u8 *) (bss + 1);
+ pos += bss->ie_len;
+ end = pos + bss->beacon_ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+ vendor_type == WPA_GET_BE32(&pos[2]))
+ wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
+ pos += 2 + pos[1];
+ }
+
+ if (wpabuf_len(buf) == 0) {
+ wpabuf_free(buf);
+ buf = NULL;
+ }
+
+ return buf;
+}
+
+
+/**
+ * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
+ * @bss: BSS table entry
+ * Returns: Maximum legacy rate in units of 500 kbps
+ */
int wpa_bss_get_max_rate(const struct wpa_bss *bss)
{
int rate = 0;
}
+/**
+ * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
+ * @bss: BSS table entry
+ * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
+ * Returns: number of legacy TX rates or -1 on failure
+ *
+ * The caller is responsible for freeing the returned buffer with os_free() in
+ * case of success.
+ */
int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
{
const u8 *ie, *ie2;
projects / mech_eap.git / blobdiff