libxt_SECMARK.c revision 9ee386a1b6d7704b259460152c959ab0e79e02aa 
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 v%s options:\n"
21"  --selctx value                     Set the SELinux security context\n"
22"\n",
23IPTABLES_VERSION);
24}
25
26static const struct option SECMARK_opts[] = {
27	{ "selctx", 1, 0, '1' },
28	{ .name = NULL }
29};
30
31/*
32 * Function which parses command options; returns true if it
33 * ate an option.
34 */
35static int SECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
36                         const void *entry, struct xt_entry_target **target)
37{
38	struct xt_secmark_target_info *info =
39		(struct xt_secmark_target_info*)(*target)->data;
40
41	switch (c) {
42	case '1':
43		if (*flags & SECMARK_MODE_SEL)
44			exit_error(PARAMETER_PROBLEM, PFX
45				   "Can't specify --selctx twice");
46		info->mode = SECMARK_MODE_SEL;
47
48		if (strlen(optarg) > SECMARK_SELCTX_MAX-1)
49			exit_error(PARAMETER_PROBLEM, PFX
50				   "Maximum length %u exceeded by --selctx"
51				   " parameter (%zu)",
52				   SECMARK_SELCTX_MAX-1, strlen(optarg));
53
54		strcpy(info->u.sel.selctx, optarg);
55		*flags |= SECMARK_MODE_SEL;
56		break;
57	default:
58		return 0;
59	}
60
61	return 1;
62}
63
64static void SECMARK_check(unsigned int flags)
65{
66	if (!flags)
67		exit_error(PARAMETER_PROBLEM, PFX "parameter required");
68}
69
70static void print_secmark(struct xt_secmark_target_info *info)
71{
72	switch (info->mode) {
73	case SECMARK_MODE_SEL:
74		printf("selctx %s ", info->u.sel.selctx);\
75		break;
76
77	default:
78		exit_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
79	}
80}
81
82static void SECMARK_print(const void *ip, const struct xt_entry_target *target,
83                          int numeric)
84{
85	struct xt_secmark_target_info *info =
86		(struct xt_secmark_target_info*)(target)->data;
87
88	printf("SECMARK ");
89	print_secmark(info);
90}
91
92/* Saves the target info in parsable form to stdout. */
93static void SECMARK_save(const void *ip, const struct xt_entry_target *target)
94{
95	struct xt_secmark_target_info *info =
96		(struct xt_secmark_target_info*)target->data;
97
98	printf("--");
99	print_secmark(info);
100}
101
102static struct xtables_target secmark_target = {
103	.family		= AF_INET,
104	.name		= "SECMARK",
105	.version	= IPTABLES_VERSION,
106	.revision	= 0,
107	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
108	.userspacesize	= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
109	.help		= SECMARK_help,
110	.parse		= SECMARK_parse,
111	.final_check	= SECMARK_check,
112	.print		= SECMARK_print,
113	.save		= SECMARK_save,
114	.extra_opts	= SECMARK_opts,
115};
116
117static struct xtables_target secmark_target6 = {
118	.family		= AF_INET6,
119	.name		= "SECMARK",
120	.version	= IPTABLES_VERSION,
121	.revision	= 0,
122	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
123	.userspacesize	= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
124	.help		= SECMARK_help,
125	.parse		= SECMARK_parse,
126	.final_check	= SECMARK_check,
127	.print		= SECMARK_print,
128	.save		= SECMARK_save,
129	.extra_opts	= SECMARK_opts,
130};
131
132void _init(void)
133{
134	xtables_register_target(&secmark_target);
135	xtables_register_target(&secmark_target6);
136}
137