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/*
* wpa_supplicant - Temporary BSSID blacklist
* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README 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;
if (wpa_s == NULL || bssid == NULL)
return NULL;
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: Current blacklist count 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;
if (wpa_s == NULL || bssid == NULL)
return -1;
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 e->count;
}
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 e->count;
}
/**
* 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;
if (wpa_s == NULL || bssid == NULL)
return -1;
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);
}
}
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