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authorJouni Malinen <j@w1.fi>2008-02-28 01:34:43 (GMT)
committerJouni Malinen <jm@jm.kir.nu>2008-02-28 01:34:43 (GMT)
commit6fc6879bd55a394f807cbbe927df736c190cb8ab (patch)
treecdf50da0c58f21510a808d53502a060d911ff243 /wpa_supplicant/blacklist.c
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Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release
Diffstat (limited to 'wpa_supplicant/blacklist.c')
-rw-r--r--wpa_supplicant/blacklist.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/wpa_supplicant/blacklist.c b/wpa_supplicant/blacklist.c
new file mode 100644
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--- /dev/null
+++ b/wpa_supplicant/blacklist.c
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+/*
+ * wpa_supplicant - Temporary BSSID blacklist
+ * Copyright (c) 2003-2007, 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 "includes.h"
+
+#include "common.h"
+#include "wpa_supplicant_i.h"
+#include "blacklist.h"
+
+/**
+ * wpa_blacklist_get - Get the blacklist entry for a BSSID
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID
+ * Returns: Matching blacklist entry for the BSSID or %NULL if not found
+ */
+struct wpa_blacklist * wpa_blacklist_get(struct wpa_supplicant *wpa_s,
+ const u8 *bssid)
+{
+ struct wpa_blacklist *e;
+
+ e = wpa_s->blacklist;
+ while (e) {
+ if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0)
+ return e;
+ e = e->next;
+ }
+
+ return NULL;
+}
+
+
+/**
+ * wpa_blacklist_add - Add an BSSID to the blacklist
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID to be added to the blacklist
+ * Returns: 0 on success, -1 on failure
+ *
+ * This function adds the specified BSSID to the blacklist or increases the
+ * blacklist count if the BSSID was already listed. It should be called when
+ * an association attempt fails either due to the selected BSS rejecting
+ * association or due to timeout.
+ *
+ * This blacklist is used to force %wpa_supplicant to go through all available
+ * BSSes before retrying to associate with an BSS that rejected or timed out
+ * association. It does not prevent the listed BSS from being used; it only
+ * changes the order in which they are tried.
+ */
+int wpa_blacklist_add(struct wpa_supplicant *wpa_s, const u8 *bssid)
+{
+ struct wpa_blacklist *e;
+
+ e = wpa_blacklist_get(wpa_s, bssid);
+ if (e) {
+ e->count++;
+ wpa_printf(MSG_DEBUG, "BSSID " MACSTR " blacklist count "
+ "incremented to %d",
+ MAC2STR(bssid), e->count);
+ return 0;
+ }
+
+ e = os_zalloc(sizeof(*e));
+ if (e == NULL)
+ return -1;
+ os_memcpy(e->bssid, bssid, ETH_ALEN);
+ e->count = 1;
+ e->next = wpa_s->blacklist;
+ wpa_s->blacklist = e;
+ wpa_printf(MSG_DEBUG, "Added BSSID " MACSTR " into blacklist",
+ MAC2STR(bssid));
+
+ return 0;
+}
+
+
+/**
+ * wpa_blacklist_del - Remove an BSSID from the blacklist
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID to be removed from the blacklist
+ * Returns: 0 on success, -1 on failure
+ */
+int wpa_blacklist_del(struct wpa_supplicant *wpa_s, const u8 *bssid)
+{
+ struct wpa_blacklist *e, *prev = NULL;
+
+ e = wpa_s->blacklist;
+ while (e) {
+ if (os_memcmp(e->bssid, bssid, ETH_ALEN) == 0) {
+ if (prev == NULL) {
+ wpa_s->blacklist = e->next;
+ } else {
+ prev->next = e->next;
+ }
+ wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
+ "blacklist", MAC2STR(bssid));
+ os_free(e);
+ return 0;
+ }
+ prev = e;
+ e = e->next;
+ }
+ return -1;
+}
+
+
+/**
+ * wpa_blacklist_clear - Clear the blacklist of all entries
+ * @wpa_s: Pointer to wpa_supplicant data
+ */
+void wpa_blacklist_clear(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_blacklist *e, *prev;
+
+ e = wpa_s->blacklist;
+ wpa_s->blacklist = NULL;
+ while (e) {
+ prev = e;
+ e = e->next;
+ wpa_printf(MSG_DEBUG, "Removed BSSID " MACSTR " from "
+ "blacklist (clear)", MAC2STR(prev->bssid));
+ os_free(prev);
+ }
+}