libxt_CONNSECMARK.c revision d09b6d591ca7d7d7575cb6aa20384c9830f777ab 
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 <stdbool.h>
9#include <stdio.h>
10#include <string.h>
11#include <stdlib.h>
12#include <getopt.h>
13#include <xtables.h>
14#include <linux/netfilter/xt_CONNSECMARK.h>
15
16#define PFX "CONNSECMARK target: "
17
18static void CONNSECMARK_help(void)
19{
20	printf(
21"CONNSECMARK target options:\n"
22"  --save                   Copy security mark from packet to conntrack\n"
23"  --restore                Copy security mark from connection to packet\n");
24}
25
26static const struct option CONNSECMARK_opts[] = {
27	{.name = "save",    .has_arg = false, .val = '1'},
28	{.name = "restore", .has_arg = false, .val = '2'},
29	XT_GETOPT_TABLEEND,
30};
31
32static int
33CONNSECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
34                  const void *entry, struct xt_entry_target **target)
35{
36	struct xt_connsecmark_target_info *info =
37		(struct xt_connsecmark_target_info*)(*target)->data;
38
39	switch (c) {
40	case '1':
41		if (*flags & CONNSECMARK_SAVE)
42			xtables_error(PARAMETER_PROBLEM, PFX
43				   "Can't specify --save twice");
44		info->mode = CONNSECMARK_SAVE;
45		*flags |= CONNSECMARK_SAVE;
46		break;
47
48	case '2':
49		if (*flags & CONNSECMARK_RESTORE)
50			xtables_error(PARAMETER_PROBLEM, PFX
51				   "Can't specify --restore twice");
52		info->mode = CONNSECMARK_RESTORE;
53		*flags |= CONNSECMARK_RESTORE;
54		break;
55	}
56
57	return 1;
58}
59
60static void CONNSECMARK_check(unsigned int flags)
61{
62	if (!flags)
63		xtables_error(PARAMETER_PROBLEM, PFX "parameter required");
64
65	if (flags == (CONNSECMARK_SAVE|CONNSECMARK_RESTORE))
66		xtables_error(PARAMETER_PROBLEM, PFX "only one flag of --save "
67		           "or --restore is allowed");
68}
69
70static void print_connsecmark(const struct xt_connsecmark_target_info *info)
71{
72	switch (info->mode) {
73	case CONNSECMARK_SAVE:
74		printf("save ");
75		break;
76
77	case CONNSECMARK_RESTORE:
78		printf("restore ");
79		break;
80
81	default:
82		xtables_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
83	}
84}
85
86static void
87CONNSECMARK_print(const void *ip, const struct xt_entry_target *target,
88                  int numeric)
89{
90	const struct xt_connsecmark_target_info *info =
91		(struct xt_connsecmark_target_info*)(target)->data;
92
93	printf("CONNSECMARK ");
94	print_connsecmark(info);
95}
96
97static void
98CONNSECMARK_save(const void *ip, const struct xt_entry_target *target)
99{
100	const struct xt_connsecmark_target_info *info =
101		(struct xt_connsecmark_target_info*)target->data;
102
103	printf("--");
104	print_connsecmark(info);
105}
106
107static struct xtables_target connsecmark_target = {
108	.family		= NFPROTO_UNSPEC,
109	.name		= "CONNSECMARK",
110	.version	= XTABLES_VERSION,
111	.revision	= 0,
112	.size		= XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
113	.userspacesize	= XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
114	.parse		= CONNSECMARK_parse,
115	.help		= CONNSECMARK_help,
116	.final_check	= CONNSECMARK_check,
117	.print		= CONNSECMARK_print,
118	.save		= CONNSECMARK_save,
119	.extra_opts	= CONNSECMARK_opts,
120};
121
122void _init(void)
123{
124	xtables_register_target(&connsecmark_target);
125}
126