1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/types.h>
10 #include <linux/ipv6.h>
11 #include <linux/in6.h>
12 #include <linux/netfilter.h>
13 #include <linux/module.h>
14 #include <linux/skbuff.h>
15 #include <linux/icmp.h>
16 #include <linux/sysctl.h>
18 #include <net/inet_frag.h>
20 #include <linux/netfilter_ipv6.h>
21 #include <linux/netfilter_bridge.h>
22 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
23 #include <net/netfilter/nf_conntrack.h>
24 #include <net/netfilter/nf_conntrack_helper.h>
25 #include <net/netfilter/nf_conntrack_l4proto.h>
26 #include <net/netfilter/nf_conntrack_l3proto.h>
27 #include <net/netfilter/nf_conntrack_core.h>
28 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
30 #include <net/netfilter/nf_conntrack_zones.h>
31 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
33 static enum ip6_defrag_users
nf_ct6_defrag_user(unsigned int hooknum
,
36 u16 zone
= NF_CT_DEFAULT_ZONE
;
38 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
40 zone
= nf_ct_zone((struct nf_conn
*)skb
->nfct
);
43 #ifdef CONFIG_BRIDGE_NETFILTER
45 skb
->nf_bridge
->mask
& BRNF_NF_BRIDGE_PREROUTING
)
46 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ zone
;
48 if (hooknum
== NF_INET_PRE_ROUTING
)
49 return IP6_DEFRAG_CONNTRACK_IN
+ zone
;
51 return IP6_DEFRAG_CONNTRACK_OUT
+ zone
;
55 static unsigned int ipv6_defrag(unsigned int hooknum
,
57 const struct net_device
*in
,
58 const struct net_device
*out
,
59 int (*okfn
)(struct sk_buff
*))
61 struct sk_buff
*reasm
;
63 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
64 /* Previously seen (loopback)? */
65 if (skb
->nfct
&& !nf_ct_is_template((struct nf_conn
*)skb
->nfct
))
69 reasm
= nf_ct_frag6_gather(skb
, nf_ct6_defrag_user(hooknum
, skb
));
74 /* error occurred or not fragmented */
78 nf_ct_frag6_output(hooknum
, reasm
, (struct net_device
*)in
,
79 (struct net_device
*)out
, okfn
);
84 static struct nf_hook_ops ipv6_defrag_ops
[] = {
89 .hooknum
= NF_INET_PRE_ROUTING
,
90 .priority
= NF_IP6_PRI_CONNTRACK_DEFRAG
,
96 .hooknum
= NF_INET_LOCAL_OUT
,
97 .priority
= NF_IP6_PRI_CONNTRACK_DEFRAG
,
101 static int __init
nf_defrag_init(void)
105 ret
= nf_ct_frag6_init();
107 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
110 ret
= nf_register_hooks(ipv6_defrag_ops
, ARRAY_SIZE(ipv6_defrag_ops
));
112 pr_err("nf_defrag_ipv6: can't register hooks\n");
118 nf_ct_frag6_cleanup();
123 static void __exit
nf_defrag_fini(void)
125 nf_unregister_hooks(ipv6_defrag_ops
, ARRAY_SIZE(ipv6_defrag_ops
));
126 nf_ct_frag6_cleanup();
129 void nf_defrag_ipv6_enable(void)
132 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable
);
134 module_init(nf_defrag_init
);
135 module_exit(nf_defrag_fini
);
137 MODULE_LICENSE("GPL");