summaryrefslogtreecommitdiffstats
path: root/extensions/libxt_NFQUEUE.c
blob: 293ef1f0b54bb0881a2a7ed9ee7de536798240d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/* 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 init(struct xt_entry_target *t)
{
}

static void 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 opts[] = {
	{ "queue-num", 1, NULL, 'F' },
	{ }
};

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
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;
}

static void
final_check(unsigned int flags)
{
}

/* Prints out the targinfo. */
static void
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
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 = { 
	.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		= &help,
	.init		= &init,
	.parse		= &parse,
	.final_check	= &final_check,
	.print		= &print,
	.save		= &save,
	.extra_opts	= opts
};

static struct xtables_target nfqueue6 = { 
	.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		= &help,
	.init		= &init,
	.parse		= &parse,
	.final_check	= &final_check,
	.print		= &print,
	.save		= &save,
	.extra_opts	= opts
};

void _init(void)
{
	xtables_register_target(&nfqueue);
	xtables_register_target(&nfqueue6);
}