libxt_NFQUEUE.c revision 03d99486d8283552705b58dc55b6085dffc38792 
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 (string_to_number(s, 0, 65535, &num) == -1)
37		exit_error(PARAMETER_PROBLEM,
38			   "Invalid queue number `%s'\n", s);
39
40    	tinfo->queuenum = num & 0xffff;
41    	return;
42}
43
44static int
45NFQUEUE_parse(int c, char **argv, int invert, unsigned int *flags,
46              const void *entry, struct xt_entry_target **target)
47{
48	struct xt_NFQ_info *tinfo
49		= (struct xt_NFQ_info *)(*target)->data;
50
51	switch (c) {
52	case 'F':
53		if (*flags)
54			exit_error(PARAMETER_PROBLEM, "NFQUEUE target: "
55				   "Only use --queue-num ONCE!");
56		parse_num(optarg, tinfo);
57		break;
58	default:
59		return 0;
60	}
61
62	return 1;
63}
64
65static void NFQUEUE_print(const void *ip,
66                          const struct xt_entry_target *target, int numeric)
67{
68	const struct xt_NFQ_info *tinfo =
69		(const struct xt_NFQ_info *)target->data;
70	printf("NFQUEUE num %u", tinfo->queuenum);
71}
72
73static void NFQUEUE_save(const void *ip, const struct xt_entry_target *target)
74{
75	const struct xt_NFQ_info *tinfo =
76		(const struct xt_NFQ_info *)target->data;
77
78	printf("--queue-num %u ", tinfo->queuenum);
79}
80
81static struct xtables_target nfqueue_target = {
82	.family		= NFPROTO_IPV4,
83	.name		= "NFQUEUE",
84	.version	= XTABLES_VERSION,
85	.size		= XT_ALIGN(sizeof(struct xt_NFQ_info)),
86	.userspacesize	= XT_ALIGN(sizeof(struct xt_NFQ_info)),
87	.help		= NFQUEUE_help,
88	.parse		= NFQUEUE_parse,
89	.print		= NFQUEUE_print,
90	.save		= NFQUEUE_save,
91	.extra_opts	= NFQUEUE_opts
92};
93
94static struct xtables_target nfqueue_target6 = {
95	.family		= NFPROTO_IPV6,
96	.name		= "NFQUEUE",
97	.version	= XTABLES_VERSION,
98	.size		= XT_ALIGN(sizeof(struct xt_NFQ_info)),
99	.userspacesize	= XT_ALIGN(sizeof(struct xt_NFQ_info)),
100	.help		= NFQUEUE_help,
101	.parse		= NFQUEUE_parse,
102	.print		= NFQUEUE_print,
103	.save		= NFQUEUE_save,
104	.extra_opts	= NFQUEUE_opts,
105};
106
107void _init(void)
108{
109	xtables_register_target(&nfqueue_target);
110	xtables_register_target(&nfqueue_target6);
111}
112