libxt_NFQUEUE.c revision c5e85736c207f211d82d2878a5781f512327dfce 
1/* Shared library add-on to iptables for NFQ
2 *
3 * (C) 2005 by Harald Welte <laforge@netfilter.org>
4 *
5 * This program is distributed under the terms of GNU GPL v2, 1991
6 *
7 */
8#include <stdio.h>
9#include <string.h>
10#include <stdlib.h>
11#include <getopt.h>
12
13#include <xtables.h>
14#include <linux/netfilter/x_tables.h>
15#include <linux/netfilter/xt_NFQUEUE.h>
16
17static void NFQUEUE_help(void)
18{
19	printf(
20"NFQUEUE target options\n"
21"  --queue-num value		Send packet to QUEUE number <value>.\n"
22"  		                Valid queue numbers are 0-65535\n"
23);
24}
25
26static const struct option NFQUEUE_opts[] = {
27	{ "queue-num", 1, NULL, 'F' },
28	{ .name = NULL }
29};
30
31static void
32parse_num(const char *s, struct xt_NFQ_info *tinfo)
33{
34	unsigned int num;
35
36	if (!xtables_strtoui(s, NULL, &num, 0, UINT16_MAX))
37		xtables_error(PARAMETER_PROBLEM,
38			   "Invalid queue number `%s'\n", s);
39
40    	tinfo->queuenum = num & 0xffff;
41}
42
43static int
44NFQUEUE_parse(int c, char **argv, int invert, unsigned int *flags,
45              const void *entry, struct xt_entry_target **target)
46{
47	struct xt_NFQ_info *tinfo
48		= (struct xt_NFQ_info *)(*target)->data;
49
50	switch (c) {
51	case 'F':
52		if (*flags)
53			xtables_error(PARAMETER_PROBLEM, "NFQUEUE target: "
54				   "Only use --queue-num ONCE!");
55		parse_num(optarg, tinfo);
56		break;
57	default:
58		return 0;
59	}
60
61	return 1;
62}
63
64static void NFQUEUE_print(const void *ip,
65                          const struct xt_entry_target *target, int numeric)
66{
67	const struct xt_NFQ_info *tinfo =
68		(const struct xt_NFQ_info *)target->data;
69	printf("NFQUEUE num %u", tinfo->queuenum);
70}
71
72static void NFQUEUE_save(const void *ip, const struct xt_entry_target *target)
73{
74	const struct xt_NFQ_info *tinfo =
75		(const struct xt_NFQ_info *)target->data;
76
77	printf("--queue-num %u ", tinfo->queuenum);
78}
79
80static struct xtables_target nfqueue_target = {
81	.family		= NFPROTO_UNSPEC,
82	.name		= "NFQUEUE",
83	.version	= XTABLES_VERSION,
84	.size		= XT_ALIGN(sizeof(struct xt_NFQ_info)),
85	.userspacesize	= XT_ALIGN(sizeof(struct xt_NFQ_info)),
86	.help		= NFQUEUE_help,
87	.parse		= NFQUEUE_parse,
88	.print		= NFQUEUE_print,
89	.save		= NFQUEUE_save,
90	.extra_opts	= NFQUEUE_opts
91};
92
93void _init(void)
94{
95	xtables_register_target(&nfqueue_target);
96}
97