libxt_NFQUEUE.c revision 932e648f38ac16b1ea14c1f66f23951388448c5a 
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	{ }
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
65/* Prints out the targinfo. */
66static void NFQUEUE_print(const void *ip,
67                          const struct xt_entry_target *target, int numeric)
68{
69	const struct xt_NFQ_info *tinfo =
70		(const struct xt_NFQ_info *)target->data;
71	printf("NFQUEUE num %u", tinfo->queuenum);
72}
73
74/* Saves the union ipt_targinfo in parsable form to stdout. */
75static void NFQUEUE_save(const void *ip, const struct xt_entry_target *target)
76{
77	const struct xt_NFQ_info *tinfo =
78		(const struct xt_NFQ_info *)target->data;
79
80	printf("--queue-num %u ", tinfo->queuenum);
81}
82
83static struct xtables_target nfqueue_target = {
84	.family		= AF_INET,
85	.name		= "NFQUEUE",
86	.version	= IPTABLES_VERSION,
87	.size		= XT_ALIGN(sizeof(struct xt_NFQ_info)),
88	.userspacesize	= XT_ALIGN(sizeof(struct xt_NFQ_info)),
89	.help		= NFQUEUE_help,
90	.parse		= NFQUEUE_parse,
91	.print		= NFQUEUE_print,
92	.save		= NFQUEUE_save,
93	.extra_opts	= NFQUEUE_opts
94};
95
96static struct xtables_target nfqueue_target6 = {
97	.family		= AF_INET6,
98	.name		= "NFQUEUE",
99	.version	= IPTABLES_VERSION,
100	.size		= XT_ALIGN(sizeof(struct xt_NFQ_info)),
101	.userspacesize	= XT_ALIGN(sizeof(struct xt_NFQ_info)),
102	.help		= NFQUEUE_help,
103	.parse		= NFQUEUE_parse,
104	.print		= NFQUEUE_print,
105	.save		= NFQUEUE_save,
106	.extra_opts	= NFQUEUE_opts,
107};
108
109void _init(void)
110{
111	xtables_register_target(&nfqueue_target);
112	xtables_register_target(&nfqueue_target6);
113}
114