2 * This module is used to copy security markings from packets
3 * to connections, and restore security markings from connections
4 * back to packets. This would normally be performed in conjunction
5 * with the SECMARK target and state match.
7 * Based somewhat on CONNMARK:
8 * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
9 * by Henrik Nordstrom <hno@marasystems.com>
11 * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
18 #include <linux/module.h>
19 #include <linux/skbuff.h>
20 #include <linux/netfilter/x_tables.h>
21 #include <linux/netfilter/xt_CONNSECMARK.h>
22 #include <net/netfilter/nf_conntrack.h>
23 #include <net/netfilter/nf_conntrack_ecache.h>
25 #define PFX "CONNSECMARK: "
27 MODULE_LICENSE("GPL");
28 MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
29 MODULE_DESCRIPTION("Xtables: target for copying between connection and security mark");
30 MODULE_ALIAS("ipt_CONNSECMARK");
31 MODULE_ALIAS("ip6t_CONNSECMARK");
34 * If the packet has a security mark and the connection does not, copy
35 * the security mark from the packet to the connection.
37 static void secmark_save(const struct sk_buff
*skb
)
41 enum ip_conntrack_info ctinfo
;
43 ct
= nf_ct_get(skb
, &ctinfo
);
44 if (ct
&& !ct
->secmark
) {
45 ct
->secmark
= skb
->secmark
;
46 nf_conntrack_event_cache(IPCT_SECMARK
, skb
);
52 * If packet has no security mark, and the connection does, restore the
53 * security mark from the connection to the packet.
55 static void secmark_restore(struct sk_buff
*skb
)
58 const struct nf_conn
*ct
;
59 enum ip_conntrack_info ctinfo
;
61 ct
= nf_ct_get(skb
, &ctinfo
);
62 if (ct
&& ct
->secmark
)
63 skb
->secmark
= ct
->secmark
;
68 connsecmark_tg(struct sk_buff
*skb
, const struct net_device
*in
,
69 const struct net_device
*out
, unsigned int hooknum
,
70 const struct xt_target
*target
, const void *targinfo
)
72 const struct xt_connsecmark_target_info
*info
= targinfo
;
75 case CONNSECMARK_SAVE
:
79 case CONNSECMARK_RESTORE
:
91 connsecmark_tg_check(const char *tablename
, const void *entry
,
92 const struct xt_target
*target
, void *targinfo
,
93 unsigned int hook_mask
)
95 const struct xt_connsecmark_target_info
*info
= targinfo
;
97 if (strcmp(tablename
, "mangle") && strcmp(tablename
, "security")) {
98 printk(KERN_INFO PFX
"target only valid in the \'mangle\' "
99 "or \'security\' tables, not \'%s\'.\n", tablename
);
103 switch (info
->mode
) {
104 case CONNSECMARK_SAVE
:
105 case CONNSECMARK_RESTORE
:
109 printk(KERN_INFO PFX
"invalid mode: %hu\n", info
->mode
);
113 if (nf_ct_l3proto_try_module_get(target
->family
) < 0) {
114 printk(KERN_WARNING
"can't load conntrack support for "
115 "proto=%u\n", target
->family
);
122 connsecmark_tg_destroy(const struct xt_target
*target
, void *targinfo
)
124 nf_ct_l3proto_module_put(target
->family
);
127 static struct xt_target connsecmark_tg_reg
[] __read_mostly
= {
129 .name
= "CONNSECMARK",
130 .family
= NFPROTO_IPV4
,
131 .checkentry
= connsecmark_tg_check
,
132 .destroy
= connsecmark_tg_destroy
,
133 .target
= connsecmark_tg
,
134 .targetsize
= sizeof(struct xt_connsecmark_target_info
),
138 .name
= "CONNSECMARK",
139 .family
= NFPROTO_IPV6
,
140 .checkentry
= connsecmark_tg_check
,
141 .destroy
= connsecmark_tg_destroy
,
142 .target
= connsecmark_tg
,
143 .targetsize
= sizeof(struct xt_connsecmark_target_info
),
148 static int __init
connsecmark_tg_init(void)
150 return xt_register_targets(connsecmark_tg_reg
,
151 ARRAY_SIZE(connsecmark_tg_reg
));
154 static void __exit
connsecmark_tg_exit(void)
156 xt_unregister_targets(connsecmark_tg_reg
,
157 ARRAY_SIZE(connsecmark_tg_reg
));
160 module_init(connsecmark_tg_init
);
161 module_exit(connsecmark_tg_exit
);