libxt_SECMARK.c revision 42979363f3958b4436c6d2503753c182c58e55ea 
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 <stdio.h>
9#include <string.h>
10#include <stdlib.h>
11#include <getopt.h>
12#include <xtables.h>
13#include <linux/netfilter/xt_SECMARK.h>
14
15#define PFX "SECMARK target: "
16
17static void SECMARK_help(void)
18{
19	printf(
20"SECMARK target options:\n"
21"  --selctx value                     Set the SELinux security context\n");
22}
23
24static const struct option SECMARK_opts[] = {
25	{ "selctx", 1, NULL, '1' },
26	{ .name = NULL }
27};
28
29static int SECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
30                         const void *entry, struct xt_entry_target **target)
31{
32	struct xt_secmark_target_info *info =
33		(struct xt_secmark_target_info*)(*target)->data;
34
35	switch (c) {
36	case '1':
37		if (*flags & SECMARK_MODE_SEL)
38			xtables_error(PARAMETER_PROBLEM, PFX
39				   "Can't specify --selctx twice");
40		info->mode = SECMARK_MODE_SEL;
41
42		if (strlen(optarg) > SECMARK_SELCTX_MAX-1)
43			xtables_error(PARAMETER_PROBLEM, PFX
44				   "Maximum length %u exceeded by --selctx"
45				   " parameter (%zu)",
46				   SECMARK_SELCTX_MAX-1, strlen(optarg));
47
48		strcpy(info->u.sel.selctx, optarg);
49		*flags |= SECMARK_MODE_SEL;
50		break;
51	default:
52		return 0;
53	}
54
55	return 1;
56}
57
58static void SECMARK_check(unsigned int flags)
59{
60	if (!flags)
61		xtables_error(PARAMETER_PROBLEM, PFX "parameter required");
62}
63
64static void print_secmark(const struct xt_secmark_target_info *info)
65{
66	switch (info->mode) {
67	case SECMARK_MODE_SEL:
68		printf("selctx %s ", info->u.sel.selctx);\
69		break;
70
71	default:
72		xtables_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
73	}
74}
75
76static void SECMARK_print(const void *ip, const struct xt_entry_target *target,
77                          int numeric)
78{
79	const struct xt_secmark_target_info *info =
80		(struct xt_secmark_target_info*)(target)->data;
81
82	printf("SECMARK ");
83	print_secmark(info);
84}
85
86static void SECMARK_save(const void *ip, const struct xt_entry_target *target)
87{
88	const struct xt_secmark_target_info *info =
89		(struct xt_secmark_target_info*)target->data;
90
91	printf("--");
92	print_secmark(info);
93}
94
95static struct xtables_target secmark_target = {
96	.family		= NFPROTO_UNSPEC,
97	.name		= "SECMARK",
98	.version	= XTABLES_VERSION,
99	.revision	= 0,
100	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
101	.userspacesize	= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
102	.help		= SECMARK_help,
103	.parse		= SECMARK_parse,
104	.final_check	= SECMARK_check,
105	.print		= SECMARK_print,
106	.save		= SECMARK_save,
107	.extra_opts	= SECMARK_opts,
108};
109
110void _init(void)
111{
112	xtables_register_target(&secmark_target);
113}
114