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/*
* (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ignore.h"
#include "jhash.h"
#include "hash.h"
#include "conntrackd.h"
#include "log.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
/* XXX: These should be configurable, better use a rb-tree */
#define IGNORE_POOL_SIZE 128
#define IGNORE_POOL_LIMIT INT_MAX
static uint32_t hash(const void *data, struct hashtable *table)
{
const uint32_t *ip = data;
return jhash_1word(*ip, 0) % table->hashsize;
}
static uint32_t hash6(const void *data, struct hashtable *table)
{
return jhash(data, sizeof(uint32_t)*4, 0) % table->hashsize;
}
static int compare(const void *data1, const void *data2)
{
const uint32_t *ip1 = data1;
const uint32_t *ip2 = data2;
return *ip1 == *ip2;
}
static int compare6(const void *data1, const void *data2)
{
return memcmp(data1, data2, sizeof(uint32_t)*4) == 0;
}
struct ignore_pool *ignore_pool_create(void)
{
struct ignore_pool *ip;
ip = malloc(sizeof(struct ignore_pool));
if (!ip)
return NULL;
memset(ip, 0, sizeof(struct ignore_pool));
ip->h = hashtable_create(IGNORE_POOL_SIZE,
IGNORE_POOL_LIMIT,
sizeof(uint32_t),
hash,
compare);
if (!ip->h) {
free(ip);
return NULL;
}
ip->h6 = hashtable_create(IGNORE_POOL_SIZE,
IGNORE_POOL_LIMIT,
sizeof(uint32_t)*4,
hash6,
compare6);
if (!ip->h6) {
free(ip->h);
free(ip);
return NULL;
}
return ip;
}
void ignore_pool_destroy(struct ignore_pool *ip)
{
hashtable_destroy(ip->h);
hashtable_destroy(ip->h6);
free(ip);
}
int ignore_pool_add(struct ignore_pool *ip, void *data, uint8_t family)
{
switch(family) {
case AF_INET:
if (!hashtable_add(ip->h, data))
return 0;
break;
case AF_INET6:
if (!hashtable_add(ip->h6, data))
return 0;
break;
}
return 1;
}
static int
__ignore_pool_test_ipv4(struct ignore_pool *ip, struct nf_conntrack *ct)
{
if (!ip->h)
return 0;
return (hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV4_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV4_DST)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV4_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV4_DST)));
}
static int
__ignore_pool_test_ipv6(struct ignore_pool *ip, struct nf_conntrack *ct)
{
if (!ip->h6)
return 0;
return (hashtable_test(ip->h6, nfct_get_attr(ct, ATTR_ORIG_IPV6_SRC)) ||
hashtable_test(ip->h6, nfct_get_attr(ct, ATTR_ORIG_IPV6_DST)) ||
hashtable_test(ip->h6, nfct_get_attr(ct, ATTR_REPL_IPV6_SRC)) ||
hashtable_test(ip->h6, nfct_get_attr(ct, ATTR_REPL_IPV6_DST)));
}
int ignore_pool_test(struct ignore_pool *ip, struct nf_conntrack *ct)
{
int ret = 0;
switch(nfct_get_attr_u8(ct, ATTR_ORIG_L3PROTO)) {
case AF_INET:
ret = __ignore_pool_test_ipv4(ip, ct);
break;
case AF_INET6:
ret = __ignore_pool_test_ipv6(ip, ct);
break;
default:
dlog(LOG_WARNING, "unknown layer 3 protocol?");
break;
}
return ret;
}
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