wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/wpa_supplicant/bss.c b/wpa_supplicant/bss.c
new file mode 100644
index 0000000..5b48951
--- /dev/null
+++ b/wpa_supplicant/bss.c
@@ -0,0 +1,615 @@
+/*
+ * BSS table
+ * Copyright (c) 2009-2010, 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.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "common/ieee802_11_defs.h"
+#include "drivers/driver.h"
+#include "wpa_supplicant_i.h"
+#include "config.h"
+#include "notify.h"
+#include "scan.h"
+#include "bss.h"
+
+
+/**
+ * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
+ */
+#define WPA_BSS_EXPIRATION_PERIOD 10
+
+#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_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ dl_list_del(&bss->list);
+ dl_list_del(&bss->list_id);
+ wpa_s->num_bss--;
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
+ " SSID '%s'", bss->id, MAC2STR(bss->bssid),
+ wpa_ssid_txt(bss->ssid, bss->ssid_len));
+ wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
+ os_free(bss);
+}
+
+
+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;
+ 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 &&
+ os_memcmp(bss->ssid, ssid, ssid_len) == 0)
+ return bss;
+ }
+ return NULL;
+}
+
+
+static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
+{
+ os_time_t usec;
+
+ dst->flags = src->flags;
+ os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
+ dst->freq = src->freq;
+ dst->beacon_int = src->beacon_int;
+ dst->caps = src->caps;
+ dst->qual = src->qual;
+ dst->noise = src->noise;
+ dst->level = src->level;
+ dst->tsf = src->tsf;
+
+ 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;
+ }
+ dst->last_update.usec -= usec;
+}
+
+
+static void wpa_bss_add(struct wpa_supplicant *wpa_s,
+ const u8 *ssid, size_t ssid_len,
+ struct wpa_scan_res *res)
+{
+ struct wpa_bss *bss;
+
+ bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
+ if (bss == NULL)
+ return;
+ bss->id = wpa_s->bss_next_id++;
+ bss->last_update_idx = wpa_s->bss_update_idx;
+ wpa_bss_copy_res(bss, res);
+ 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);
+
+ 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_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
+ " SSID '%s'",
+ bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
+ 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));
+ }
+}
+
+
+static int are_ies_equal(const struct wpa_bss *old,
+ const struct wpa_scan_res *new, u32 ie)
+{
+ const u8 *old_ie, *new_ie;
+ struct wpabuf *old_ie_buff = NULL;
+ struct wpabuf *new_ie_buff = NULL;
+ int new_ie_len, old_ie_len, ret, is_multi;
+
+ 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);
+ 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);
+ 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);
+ is_multi = 0;
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
+ return 0;
+ }
+
+ if (is_multi) {
+ /* in case of multiple IEs stored in buffer */
+ old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
+ new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
+ old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
+ new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
+ } else {
+ /* in case of single IE */
+ old_ie_len = old_ie ? old_ie[1] + 2 : 0;
+ new_ie_len = new_ie ? new_ie[1] + 2 : 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);
+
+ return ret;
+}
+
+
+static u32 wpa_bss_compare_res(const struct wpa_bss *old,
+ const struct wpa_scan_res *new)
+{
+ u32 changes = 0;
+ int caps_diff = old->caps ^ new->caps;
+
+ if (old->freq != new->freq)
+ changes |= WPA_BSS_FREQ_CHANGED_FLAG;
+
+ if (old->level != new->level)
+ changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
+
+ if (caps_diff & IEEE80211_CAP_PRIVACY)
+ changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
+
+ 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)
+ return changes;
+ changes |= WPA_BSS_IES_CHANGED_FLAG;
+
+ if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
+ changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
+
+ if (!are_ies_equal(old, new, WLAN_EID_RSN))
+ changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
+
+ if (!are_ies_equal(old, new, 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))
+ changes |= WPA_BSS_RATES_CHANGED_FLAG;
+
+ return changes;
+}
+
+
+static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
+ const struct wpa_bss *bss)
+{
+ if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
+ wpas_notify_bss_freq_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
+ wpas_notify_bss_signal_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
+ wpas_notify_bss_privacy_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_MODE_CHANGED_FLAG)
+ wpas_notify_bss_mode_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
+ wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
+ wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_WPS_CHANGED_FLAG)
+ wpas_notify_bss_wps_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_IES_CHANGED_FLAG)
+ wpas_notify_bss_ies_changed(wpa_s, bss->id);
+
+ if (changes & WPA_BSS_RATES_CHANGED_FLAG)
+ wpas_notify_bss_rates_changed(wpa_s, bss->id);
+}
+
+
+static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
+ struct wpa_scan_res *res)
+{
+ u32 changes;
+
+ changes = wpa_bss_compare_res(bss, res);
+ bss->scan_miss_count = 0;
+ bss->last_update_idx = wpa_s->bss_update_idx;
+ wpa_bss_copy_res(bss, res);
+ /* Move the entry to the end of the list */
+ dl_list_del(&bss->list);
+ 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);
+ bss->ie_len = res->ie_len;
+ bss->beacon_ie_len = res->beacon_ie_len;
+ } else {
+ struct wpa_bss *nbss;
+ struct dl_list *prev = bss->list_id.prev;
+ dl_list_del(&bss->list_id);
+ nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
+ res->beacon_ie_len);
+ if (nbss) {
+ bss = nbss;
+ os_memcpy(bss + 1, res + 1,
+ res->ie_len + res->beacon_ie_len);
+ bss->ie_len = res->ie_len;
+ bss->beacon_ie_len = res->beacon_ie_len;
+ }
+ dl_list_add(prev, &bss->list_id);
+ }
+ 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;
+}
+
+
+void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
+{
+ wpa_s->bss_update_idx++;
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
+ wpa_s->bss_update_idx);
+}
+
+
+void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
+ struct wpa_scan_res *res)
+{
+ const u8 *ssid, *p2p;
+ struct wpa_bss *bss;
+
+ ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
+ if (ssid == NULL) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
+ MACSTR, MAC2STR(res->bssid));
+ return;
+ }
+ if (ssid[1] > 32) {
+ 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);
+ 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) */
+ 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);
+}
+
+
+static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
+ const struct scan_info *info)
+{
+ int found;
+ size_t i;
+
+ if (info == NULL)
+ return 1;
+
+ if (info->num_freqs) {
+ found = 0;
+ for (i = 0; i < info->num_freqs; i++) {
+ if (bss->freq == info->freqs[i]) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return 0;
+ }
+
+ if (info->num_ssids) {
+ found = 0;
+ for (i = 0; i < info->num_ssids; i++) {
+ const struct wpa_driver_scan_ssid *s = &info->ssids[i];
+ if ((s->ssid == NULL || s->ssid_len == 0) ||
+ (s->ssid_len == bss->ssid_len &&
+ os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
+ 0)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return 0;
+ }
+
+ return 1;
+}
+
+
+void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
+ int new_scan)
+{
+ struct wpa_bss *bss, *n;
+
+ if (!new_scan)
+ return; /* do not expire entries without new scan */
+
+ dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
+ if (wpa_bss_in_use(wpa_s, bss))
+ continue;
+ if (!wpa_bss_included_in_scan(bss, info))
+ 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_s->conf->bss_expiration_scan_count) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to "
+ "no match in scan", bss->id);
+ wpa_bss_remove(wpa_s, bss);
+ }
+ }
+}
+
+
+void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
+{
+ struct wpa_bss *bss, *n;
+ struct os_time t;
+
+ if (dl_list_empty(&wpa_s->bss))
+ return;
+
+ os_get_time(&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_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to "
+ "age", bss->id);
+ wpa_bss_remove(wpa_s, bss);
+ } else
+ break;
+ }
+}
+
+
+static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+
+ wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
+ eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
+ wpa_bss_timeout, wpa_s, NULL);
+}
+
+
+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_flush(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_bss *bss, *n;
+
+ 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) {
+ if (wpa_bss_in_use(wpa_s, bss))
+ continue;
+ wpa_bss_remove(wpa_s, bss);
+ }
+}
+
+
+void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
+{
+ eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
+ wpa_bss_flush(wpa_s);
+}
+
+
+struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
+ const u8 *bssid)
+{
+ struct wpa_bss *bss;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
+ return bss;
+ }
+ return NULL;
+}
+
+
+struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
+{
+ struct wpa_bss *bss;
+ dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (bss->id == id)
+ return bss;
+ }
+ return NULL;
+}
+
+
+const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
+{
+ const u8 *end, *pos;
+
+ pos = (const u8 *) (bss + 1);
+ end = pos + bss->ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == ie)
+ return pos;
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+
+const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
+{
+ const u8 *end, *pos;
+
+ pos = (const u8 *) (bss + 1);
+ end = pos + bss->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;
+}
+
+
+struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
+ u32 vendor_type)
+{
+ struct wpabuf *buf;
+ const u8 *end, *pos;
+
+ buf = wpabuf_alloc(bss->ie_len);
+ if (buf == NULL)
+ return NULL;
+
+ pos = (const u8 *) (bss + 1);
+ end = pos + bss->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;
+}
+
+
+int wpa_bss_get_max_rate(const struct wpa_bss *bss)
+{
+ int rate = 0;
+ const u8 *ie;
+ int i;
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
+ for (i = 0; ie && i < ie[1]; i++) {
+ if ((ie[i + 2] & 0x7f) > rate)
+ rate = ie[i + 2] & 0x7f;
+ }
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
+ for (i = 0; ie && i < ie[1]; i++) {
+ if ((ie[i + 2] & 0x7f) > rate)
+ rate = ie[i + 2] & 0x7f;
+ }
+
+ return rate;
+}
+
+
+int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
+{
+ const u8 *ie, *ie2;
+ int i, j;
+ unsigned int len;
+ u8 *r;
+
+ ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
+ ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
+
+ len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
+
+ r = os_malloc(len);
+ if (!r)
+ return -1;
+
+ for (i = 0; ie && i < ie[1]; i++)
+ r[i] = ie[i + 2] & 0x7f;
+
+ for (j = 0; ie2 && j < ie2[1]; j++)
+ r[i + j] = ie2[j + 2] & 0x7f;
+
+ *rates = r;
+ return len;
+}