libxt_CONNSECMARK.c revision c5e85736c207f211d82d2878a5781f512327dfce 
1/*
2 * Shared library add-on to iptables to add CONNSECMARK target support.
3 *
4 * Based on the MARK and CONNMARK targets.
5 *
6 * Copyright (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
7 */
8#include <stdio.h>
9#include <string.h>
10#include <stdlib.h>
11#include <getopt.h>
12#include <xtables.h>
13#include <linux/netfilter/xt_CONNSECMARK.h>
14
15#define PFX "CONNSECMARK target: "
16
17static void CONNSECMARK_help(void)
18{
19	printf(
20"CONNSECMARK target options:\n"
21"  --save                   Copy security mark from packet to conntrack\n"
22"  --restore                Copy security mark from connection to packet\n");
23}
24
25static const struct option CONNSECMARK_opts[] = {
26	{ "save", 0, NULL, '1' },
27	{ "restore", 0, NULL, '2' },
28	{ .name = NULL }
29};
30
31static int
32CONNSECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
33                  const void *entry, struct xt_entry_target **target)
34{
35	struct xt_connsecmark_target_info *info =
36		(struct xt_connsecmark_target_info*)(*target)->data;
37
38	switch (c) {
39	case '1':
40		if (*flags & CONNSECMARK_SAVE)
41			xtables_error(PARAMETER_PROBLEM, PFX
42				   "Can't specify --save twice");
43		info->mode = CONNSECMARK_SAVE;
44		*flags |= CONNSECMARK_SAVE;
45		break;
46
47	case '2':
48		if (*flags & CONNSECMARK_RESTORE)
49			xtables_error(PARAMETER_PROBLEM, PFX
50				   "Can't specify --restore twice");
51		info->mode = CONNSECMARK_RESTORE;
52		*flags |= CONNSECMARK_RESTORE;
53		break;
54
55	default:
56		return 0;
57	}
58
59	return 1;
60}
61
62static void CONNSECMARK_check(unsigned int flags)
63{
64	if (!flags)
65		xtables_error(PARAMETER_PROBLEM, PFX "parameter required");
66
67	if (flags == (CONNSECMARK_SAVE|CONNSECMARK_RESTORE))
68		xtables_error(PARAMETER_PROBLEM, PFX "only one flag of --save "
69		           "or --restore is allowed");
70}
71
72static void print_connsecmark(const struct xt_connsecmark_target_info *info)
73{
74	switch (info->mode) {
75	case CONNSECMARK_SAVE:
76		printf("save ");
77		break;
78
79	case CONNSECMARK_RESTORE:
80		printf("restore ");
81		break;
82
83	default:
84		xtables_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
85	}
86}
87
88static void
89CONNSECMARK_print(const void *ip, const struct xt_entry_target *target,
90                  int numeric)
91{
92	const struct xt_connsecmark_target_info *info =
93		(struct xt_connsecmark_target_info*)(target)->data;
94
95	printf("CONNSECMARK ");
96	print_connsecmark(info);
97}
98
99static void
100CONNSECMARK_save(const void *ip, const struct xt_entry_target *target)
101{
102	const struct xt_connsecmark_target_info *info =
103		(struct xt_connsecmark_target_info*)target->data;
104
105	printf("--");
106	print_connsecmark(info);
107}
108
109static struct xtables_target connsecmark_target = {
110	.family		= NFPROTO_UNSPEC,
111	.name		= "CONNSECMARK",
112	.version	= XTABLES_VERSION,
113	.revision	= 0,
114	.size		= XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
115	.userspacesize	= XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
116	.parse		= CONNSECMARK_parse,
117	.help		= CONNSECMARK_help,
118	.final_check	= CONNSECMARK_check,
119	.print		= CONNSECMARK_print,
120	.save		= CONNSECMARK_save,
121	.extra_opts	= CONNSECMARK_opts,
122};
123
124void _init(void)
125{
126	xtables_register_target(&connsecmark_target);
127}
128