libxt_SECMARK.c revision 73866357e4a7a0fdc1b293bf8863fee2bd56da9e 
1/*
2 * Shared library add-on to iptables to add SECMARK target support.
3 *
4 * Based on the MARK target.
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_SECMARK.h>
15
16#define PFX "SECMARK target: "
17
18static void SECMARK_help(void)
19{
20	printf(
21"SECMARK target options:\n"
22"  --selctx value                     Set the SELinux security context\n");
23}
24
25static const struct option SECMARK_opts[] = {
26	{.name = "selctx", .has_arg = true, .val = '1'},
27	XT_GETOPT_TABLEEND,
28};
29
30static int SECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
31                         const void *entry, struct xt_entry_target **target)
32{
33	struct xt_secmark_target_info *info =
34		(struct xt_secmark_target_info*)(*target)->data;
35
36	switch (c) {
37	case '1':
38		if (*flags & SECMARK_MODE_SEL)
39			xtables_error(PARAMETER_PROBLEM, PFX
40				   "Can't specify --selctx twice");
41		info->mode = SECMARK_MODE_SEL;
42
43		if (strlen(optarg) > SECMARK_SECCTX_MAX-1)
44			xtables_error(PARAMETER_PROBLEM, PFX
45				   "Maximum length %u exceeded by --selctx"
46				   " parameter (%zu)",
47				   SECMARK_SECCTX_MAX-1, strlen(optarg));
48
49		strcpy(info->secctx, optarg);
50		*flags |= SECMARK_MODE_SEL;
51		break;
52	}
53
54	return 1;
55}
56
57static void SECMARK_check(unsigned int flags)
58{
59	if (!flags)
60		xtables_error(PARAMETER_PROBLEM, PFX "parameter required");
61}
62
63static void print_secmark(const struct xt_secmark_target_info *info)
64{
65	switch (info->mode) {
66	case SECMARK_MODE_SEL:
67		printf("selctx %s", info->secctx);
68		break;
69
70	default:
71		xtables_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
72	}
73}
74
75static void SECMARK_print(const void *ip, const struct xt_entry_target *target,
76                          int numeric)
77{
78	const struct xt_secmark_target_info *info =
79		(struct xt_secmark_target_info*)(target)->data;
80
81	printf(" SECMARK ");
82	print_secmark(info);
83}
84
85static void SECMARK_save(const void *ip, const struct xt_entry_target *target)
86{
87	const struct xt_secmark_target_info *info =
88		(struct xt_secmark_target_info*)target->data;
89
90	printf(" --");
91	print_secmark(info);
92}
93
94static struct xtables_target secmark_target = {
95	.family		= NFPROTO_UNSPEC,
96	.name		= "SECMARK",
97	.version	= XTABLES_VERSION,
98	.revision	= 0,
99	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
100	.userspacesize	= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
101	.help		= SECMARK_help,
102	.parse		= SECMARK_parse,
103	.final_check	= SECMARK_check,
104	.print		= SECMARK_print,
105	.save		= SECMARK_save,
106	.extra_opts	= SECMARK_opts,
107};
108
109void _init(void)
110{
111	xtables_register_target(&secmark_target);
112}
113