1/*
2 * Shared library add-on to iptables to add SECMARK target support.
3 *
4 * Based on the MARK target.
5 *
6 * IPv6 version.
7 *
8 * Copyright (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
9 */
10#include <stdio.h>
11#include <string.h>
12#include <stdlib.h>
13#include <getopt.h>
14#include <ip6tables.h>
15#include <linux/netfilter/xt_SECMARK.h>
16
17#define PFX "SECMARK target: "
18
19static void help(void)
20{
21	printf(
22"SECMARK target v%s options:\n"
23"  --selctx value                     Set the SELinux security context\n"
24"\n",
25IPTABLES_VERSION);
26}
27
28static struct option opts[] = {
29	{ "selctx", 1, 0, '1' },
30	{ 0 }
31};
32
33/* Initialize the target. */
34static void init(struct ip6t_entry_target *t, unsigned int *nfcache)
35{ }
36
37/*
38 * Function which parses command options; returns true if it
39 * ate an option.
40 */
41static int parse(int c, char **argv, int invert, unsigned int *flags,
42                 const struct ip6t_entry *entry, struct ip6t_entry_target **target)
43{
44	struct xt_secmark_target_info *info =
45		(struct xt_secmark_target_info*)(*target)->data;
46
47	switch (c) {
48	case '1':
49		if (*flags & SECMARK_MODE_SEL)
50			exit_error(PARAMETER_PROBLEM, PFX
51				   "Can't specify --selctx twice");
52		info->mode = SECMARK_MODE_SEL;
53
54		if (strlen(optarg) > SECMARK_SELCTX_MAX-1)
55			exit_error(PARAMETER_PROBLEM, PFX
56				   "Maximum length %u exceeded by --selctx"
57				   " parameter (%zu)",
58				   SECMARK_SELCTX_MAX-1, strlen(optarg));
59
60		strcpy(info->u.sel.selctx, optarg);
61		*flags |= SECMARK_MODE_SEL;
62		break;
63	default:
64		return 0;
65	}
66
67	return 1;
68}
69
70static void final_check(unsigned int flags)
71{
72	if (!flags)
73		exit_error(PARAMETER_PROBLEM, PFX "parameter required");
74}
75
76static void print_secmark(struct xt_secmark_target_info *info)
77{
78	switch (info->mode) {
79	case SECMARK_MODE_SEL:
80		printf("selctx %s ", info->u.sel.selctx);\
81		break;
82
83	default:
84		exit_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
85	}
86}
87
88static void print(const struct ip6t_ip6 *ip,
89		  const struct ip6t_entry_target *target, int numeric)
90{
91	struct xt_secmark_target_info *info =
92		(struct xt_secmark_target_info*)(target)->data;
93
94	printf("SECMARK ");
95	print_secmark(info);
96}
97
98/* Saves the target info in parsable form to stdout. */
99static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_target *target)
100{
101	struct xt_secmark_target_info *info =
102		(struct xt_secmark_target_info*)target->data;
103
104	printf("--");
105	print_secmark(info);
106}
107
108static struct ip6tables_target secmark = {
109	.name		= "SECMARK",
110	.version	= IPTABLES_VERSION,
111	.size		= IP6T_ALIGN(sizeof(struct xt_secmark_target_info)),
112	.userspacesize	= IP6T_ALIGN(sizeof(struct xt_secmark_target_info)),
113	.help		= &help,
114	.init		= &init,
115	.parse		= &parse,
116	.final_check	= &final_check,
117	.print		= &print,
118	.save		= &save,
119	.extra_opts	= opts
120};
121
122void _init(void)
123{
124	register_target6(&secmark);
125}
126