1/* Shared library add-on to iptables to add connmark matching support.
2 *
3 * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
4 * by Henrik Nordstrom <hno@marasystems.com>
5 *
6 * Version 1.1
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 */
22#include <stdio.h>
23#include <netdb.h>
24#include <string.h>
25#include <stdlib.h>
26#include <getopt.h>
27
28#include <ip6tables.h>
29#include "../include/linux/netfilter_ipv4/ipt_connmark.h"
30
31/* Function which prints out usage message. */
32static void
33help(void)
34{
35	printf(
36"CONNMARK match v%s options:\n"
37"[!] --mark value[/mask]         Match nfmark value with optional mask\n"
38"\n",
39IPTABLES_VERSION);
40}
41
42static struct option opts[] = {
43	{ "mark", 1, 0, '1' },
44	{0}
45};
46
47/* Initialize the match. */
48static void
49init(struct ip6t_entry_match *m, unsigned int *nfcache)
50{
51	/* Can't cache this. */
52	*nfcache |= NFC_UNKNOWN;
53}
54
55/* Function which parses command options; returns true if it
56   ate an option */
57static int
58parse(int c, char **argv, int invert, unsigned int *flags,
59      const struct ip6t_entry *entry,
60      unsigned int *nfcache,
61      struct ip6t_entry_match **match)
62{
63	struct ipt_connmark_info *markinfo = (struct ipt_connmark_info *)(*match)->data;
64
65	switch (c) {
66		char *end;
67	case '1':
68		check_inverse(optarg, &invert, &optind, 0);
69
70		markinfo->mark = strtoul(optarg, &end, 0);
71		markinfo->mask = 0xffffffffUL;
72
73		if (*end == '/')
74			markinfo->mask = strtoul(end+1, &end, 0);
75
76		if (*end != '\0' || end == optarg)
77			exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
78		if (invert)
79			markinfo->invert = 1;
80		*flags = 1;
81		break;
82
83	default:
84		return 0;
85	}
86	return 1;
87}
88
89static void
90print_mark(unsigned long mark, unsigned long mask, int numeric)
91{
92	if(mask != 0xffffffffUL)
93		printf("0x%lx/0x%lx ", mark, mask);
94	else
95		printf("0x%lx ", mark);
96}
97
98/* Final check; must have specified --mark. */
99static void
100final_check(unsigned int flags)
101{
102	if (!flags)
103		exit_error(PARAMETER_PROBLEM,
104			   "MARK match: You must specify `--mark'");
105}
106
107/* Prints out the matchinfo. */
108static void
109print(const struct ip6t_ip6 *ip,
110      const struct ip6t_entry_match *match,
111      int numeric)
112{
113	struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data;
114
115	printf("CONNMARK match ");
116	if (info->invert)
117		printf("!");
118	print_mark(info->mark, info->mask, numeric);
119}
120
121/* Saves the matchinfo in parsable form to stdout. */
122static void
123save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
124{
125	struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data;
126
127	if (info->invert)
128		printf("! ");
129
130	printf("--mark ");
131	print_mark(info->mark, info->mask, 0);
132}
133
134static struct ip6tables_match connmark_match = {
135    .name          = "connmark",
136    .version       = IPTABLES_VERSION,
137    .size          = IP6T_ALIGN(sizeof(struct ipt_connmark_info)),
138    .userspacesize = IP6T_ALIGN(sizeof(struct ipt_connmark_info)),
139    .help          = &help,
140    .init          = &init,
141    .parse         = &parse,
142    .final_check   = &final_check,
143    .print         = &print,
144    .save          = &save,
145    .extra_opts    = opts
146};
147
148void _init(void)
149{
150	register_match6(&connmark_match);
151}
152