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/*
* Shared library add-on to iptables to add early socket matching support.
*
* Copyright (C) 2007 BalaBit IT Ltd.
*/
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_socket.h>
static const struct option socket_mt_opts[] = {
{.name = "transparent", .has_arg = false, .val = 't'},
XT_GETOPT_TABLEEND,
};
static void socket_mt_help(void)
{
printf(
"socket match options:\n"
" --transparent Ignore non-transparent sockets\n\n");
}
static int socket_mt_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_socket_mtinfo1 *info = (void *)(*match)->data;
switch (c) {
case 't':
info->flags |= XT_SOCKET_TRANSPARENT;
return true;
}
return false;
}
static void
socket_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_socket_mtinfo1 *info = (const void *)match->data;
if (info->flags & XT_SOCKET_TRANSPARENT)
printf("--transparent ");
}
static void
socket_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf("socket ");
socket_mt_save(ip, match);
}
static struct xtables_match socket_mt_reg[] = {
{
.name = "socket",
.revision = 0,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(0),
.userspacesize = XT_ALIGN(0),
},
{
.name = "socket",
.revision = 1,
.family = NFPROTO_UNSPEC,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
.help = socket_mt_help,
.parse = socket_mt_parse,
.print = socket_mt_print,
.save = socket_mt_save,
.extra_opts = socket_mt_opts,
},
};
void _init(void)
{
xtables_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
}
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