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_2connmark.h"
30
31 /* Function which prints out usage message. */
32 static void
help(void)33 help(void)
34 {
35 printf(
36 "CONNMARK match v%s options:\n"
37 "[!] --mark value[/mask] Match nfmark value with optional mask\n"
38 "\n",
39 IPTABLES_VERSION);
40 }
41
42 static struct option opts[] = {
43 { "mark", 1, 0, '1' },
44 {0}
45 };
46
47 /* Initialize the match. */
48 static void
init(struct ip6t_entry_match * m,unsigned int * nfcache)49 init(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 */
57 static int
parse(int c,char ** argv,int invert,unsigned int * flags,const struct ip6t_entry * entry,unsigned int * nfcache,struct ip6t_entry_match ** match)58 parse(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
89 static void
print_mark(unsigned long mark,unsigned long mask,int numeric)90 print_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. */
99 static void
final_check(unsigned int flags)100 final_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. */
108 static void
print(const struct ip6t_ip6 * ip,const struct ip6t_entry_match * match,int numeric)109 print(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. */
122 static void
save(const struct ip6t_ip6 * ip,const struct ip6t_entry_match * match)123 save(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
134 static 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
_init(void)148 void _init(void)
149 {
150 register_match6(&connmark_match);
151 }
152