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/* Shared library add-on to iptables for NFQ
*
* (C) 2005 by Harald Welte <laforge@netfilter.org>
*
* This program is distributed under the terms of GNU GPL v2, 1991
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_NFQUEUE.h>
static void NFQUEUE_help(void)
{
printf(
"NFQUEUE target options\n"
" --queue-num value Send packet to QUEUE number <value>.\n"
" Valid queue numbers are 0-65535\n"
);
}
static const struct option NFQUEUE_opts[] = {
{ "queue-num", 1, NULL, 'F' },
{ .name = NULL }
};
static void
parse_num(const char *s, struct xt_NFQ_info *tinfo)
{
unsigned int num;
if (string_to_number(s, 0, 65535, &num) == -1)
exit_error(PARAMETER_PROBLEM,
"Invalid queue number `%s'\n", s);
tinfo->queuenum = num & 0xffff;
return;
}
static int
NFQUEUE_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_NFQ_info *tinfo
= (struct xt_NFQ_info *)(*target)->data;
switch (c) {
case 'F':
if (*flags)
exit_error(PARAMETER_PROBLEM, "NFQUEUE target: "
"Only use --queue-num ONCE!");
parse_num(optarg, tinfo);
break;
default:
return 0;
}
return 1;
}
/* Prints out the targinfo. */
static void NFQUEUE_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_NFQ_info *tinfo =
(const struct xt_NFQ_info *)target->data;
printf("NFQUEUE num %u", tinfo->queuenum);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void NFQUEUE_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_NFQ_info *tinfo =
(const struct xt_NFQ_info *)target->data;
printf("--queue-num %u ", tinfo->queuenum);
}
static struct xtables_target nfqueue_target = {
.family = AF_INET,
.name = "NFQUEUE",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.help = NFQUEUE_help,
.parse = NFQUEUE_parse,
.print = NFQUEUE_print,
.save = NFQUEUE_save,
.extra_opts = NFQUEUE_opts
};
static struct xtables_target nfqueue_target6 = {
.family = AF_INET6,
.name = "NFQUEUE",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.help = NFQUEUE_help,
.parse = NFQUEUE_parse,
.print = NFQUEUE_print,
.save = NFQUEUE_save,
.extra_opts = NFQUEUE_opts,
};
void _init(void)
{
xtables_register_target(&nfqueue_target);
xtables_register_target(&nfqueue_target6);
}
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