summaryrefslogtreecommitdiffstats
path: root/extensions/libxt_connmark.c
blob: f2e32f2c95915e7290ce7dfbae7d3ca406bb4b92 (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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* Shared library add-on to iptables to add connmark matching support.
 *
 * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
 * by Henrik Nordstrom <hno@marasystems.com>
 *
 * Version 1.1
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#include <xtables.h>
#include <linux/netfilter/xt_connmark.h>

/* Function which prints out usage message. */
static void connmark_help(void)
{
	printf(
"CONNMARK match v%s options:\n"
"[!] --mark value[/mask]         Match nfmark value with optional mask\n"
"\n",
IPTABLES_VERSION);
}

static const struct option connmark_opts[] = {
	{ "mark", 1, NULL, '1' },
	{ }
};

/* Function which parses command options; returns true if it
   ate an option */
static int
connmark_parse(int c, char **argv, int invert, unsigned int *flags,
               const void *entry, struct xt_entry_match **match)
{
	struct xt_connmark_info *markinfo = (struct xt_connmark_info *)(*match)->data;

	switch (c) {
		char *end;
	case '1':
		check_inverse(optarg, &invert, &optind, 0);

		markinfo->mark = strtoul(optarg, &end, 0);
		markinfo->mask = 0xffffffffUL;
		
		if (*end == '/')
			markinfo->mask = strtoul(end+1, &end, 0);

		if (*end != '\0' || end == optarg)
			exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
		if (invert)
			markinfo->invert = 1;
		*flags = 1;
		break;

	default:
		return 0;
	}
	return 1;
}

static void
print_mark(unsigned long mark, unsigned long mask, int numeric)
{
	if(mask != 0xffffffffUL)
		printf("0x%lx/0x%lx ", mark, mask);
	else
		printf("0x%lx ", mark);
}

/* Final check; must have specified --mark. */
static void connmark_check(unsigned int flags)
{
	if (!flags)
		exit_error(PARAMETER_PROBLEM,
			   "MARK match: You must specify `--mark'");
}

/* Prints out the matchinfo. */
static void
connmark_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
	struct xt_connmark_info *info = (struct xt_connmark_info *)match->data;

	printf("CONNMARK match ");
	if (info->invert)
		printf("!");
	print_mark(info->mark, info->mask, numeric);
}

/* Saves the matchinfo in parsable form to stdout. */
static void connmark_save(const void *ip, const struct xt_entry_match *match)
{
	struct xt_connmark_info *info = (struct xt_connmark_info *)match->data;

	if (info->invert)
		printf("! ");

	printf("--mark ");
	print_mark(info->mark, info->mask, 0);
}

static struct xtables_match connmark_match = {
	.family		= AF_INET,
	.name		= "connmark",
	.version	= IPTABLES_VERSION,
	.size		= XT_ALIGN(sizeof(struct xt_connmark_info)),
	.userspacesize	= XT_ALIGN(sizeof(struct xt_connmark_info)),
	.help		= connmark_help,
	.parse		= connmark_parse,
	.final_check	= connmark_check,
	.print		= connmark_print,
	.save		= connmark_save,
	.extra_opts	= connmark_opts,
};

static struct xtables_match connmark_match6 = {
	.family		= AF_INET6,
	.name		= "connmark",
	.version	= IPTABLES_VERSION,
	.size		= XT_ALIGN(sizeof(struct xt_connmark_info)),
	.userspacesize	= XT_ALIGN(sizeof(struct xt_connmark_info)),
	.help		= connmark_help,
	.parse		= connmark_parse,
	.final_check	= connmark_check,
	.print		= connmark_print,
	.save		= connmark_save,
	.extra_opts	= connmark_opts,
};

void _init(void)
{
	xtables_register_match(&connmark_match);
	xtables_register_match(&connmark_match6);
}