libxt_SECMARK.c revision 661f112072bc13a1625c4eb5983695e122ea97da 
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 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 opts[] = {
27	{ "selctx", 1, 0, '1' },
28	{ 0 }
29};
30
31/* Initialize the target. */
32static void init(struct xt_entry_target *t, unsigned int *nfcache)
33{ }
34
35/*
36 * Function which parses command options; returns true if it
37 * ate an option.
38 */
39static int parse(int c, char **argv, int invert, unsigned int *flags,
40                 const void *entry, struct xt_entry_target **target)
41{
42	struct xt_secmark_target_info *info =
43		(struct xt_secmark_target_info*)(*target)->data;
44
45	switch (c) {
46	case '1':
47		if (*flags & SECMARK_MODE_SEL)
48			exit_error(PARAMETER_PROBLEM, PFX
49				   "Can't specify --selctx twice");
50		info->mode = SECMARK_MODE_SEL;
51
52		if (strlen(optarg) > SECMARK_SELCTX_MAX-1)
53			exit_error(PARAMETER_PROBLEM, PFX
54				   "Maximum length %u exceeded by --selctx"
55				   " parameter (%zu)",
56				   SECMARK_SELCTX_MAX-1, strlen(optarg));
57
58		strcpy(info->u.sel.selctx, optarg);
59		*flags |= SECMARK_MODE_SEL;
60		break;
61	default:
62		return 0;
63	}
64
65	return 1;
66}
67
68static void final_check(unsigned int flags)
69{
70	if (!flags)
71		exit_error(PARAMETER_PROBLEM, PFX "parameter required");
72}
73
74static void print_secmark(struct xt_secmark_target_info *info)
75{
76	switch (info->mode) {
77	case SECMARK_MODE_SEL:
78		printf("selctx %s ", info->u.sel.selctx);\
79		break;
80
81	default:
82		exit_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
83	}
84}
85
86static void print(const void *ip,
87		  const struct xt_entry_target *target, int numeric)
88{
89	struct xt_secmark_target_info *info =
90		(struct xt_secmark_target_info*)(target)->data;
91
92	printf("SECMARK ");
93	print_secmark(info);
94}
95
96/* Saves the target info in parsable form to stdout. */
97static void save(const void *ip, const struct xt_entry_target *target)
98{
99	struct xt_secmark_target_info *info =
100		(struct xt_secmark_target_info*)target->data;
101
102	printf("--");
103	print_secmark(info);
104}
105
106static struct xtables_target secmark = {
107	.family		= AF_INET,
108	.name		= "SECMARK",
109	.version	= IPTABLES_VERSION,
110	.revision	= 0,
111	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
112	.userspacesize	= XT_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
122static struct xtables_target secmark6 = {
123	.family		= AF_INET6,
124	.name		= "SECMARK",
125	.version	= IPTABLES_VERSION,
126	.revision	= 0,
127	.size		= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
128	.userspacesize	= XT_ALIGN(sizeof(struct xt_secmark_target_info)),
129	.help		= &help,
130	.init		= &init,
131	.parse		= &parse,
132	.final_check	= &final_check,
133	.print		= &print,
134	.save		= &save,
135	.extra_opts	= opts
136};
137
138void _init(void)
139{
140	xtables_register_target(&secmark);
141	xtables_register_target(&secmark6);
142}
143