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 IS_ENABLED(CONFIG_NF_CONNTRACK)
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_id
= NF_CT_DEFAULT_ZONE_ID
;
37 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
39 enum ip_conntrack_info ctinfo
;
40 const struct nf_conn
*ct
= nf_ct_get(skb
, &ctinfo
);
42 zone_id
= nf_ct_zone_id(nf_ct_zone(ct
), CTINFO2DIR(ctinfo
));
45 if (nf_bridge_in_prerouting(skb
))
46 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN
+ zone_id
;
48 if (hooknum
== NF_INET_PRE_ROUTING
)
49 return IP6_DEFRAG_CONNTRACK_IN
+ zone_id
;
51 return IP6_DEFRAG_CONNTRACK_OUT
+ zone_id
;
54 static unsigned int ipv6_defrag(const struct nf_hook_ops
*ops
,
56 const struct nf_hook_state
*state
)
58 struct sk_buff
*reasm
;
60 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
61 /* Previously seen (loopback)? */
62 if (skb
->nfct
&& !nf_ct_is_template((struct nf_conn
*)skb
->nfct
))
66 reasm
= nf_ct_frag6_gather(skb
, nf_ct6_defrag_user(ops
->hooknum
, skb
));
71 /* error occurred or not fragmented */
75 nf_ct_frag6_consume_orig(reasm
);
77 NF_HOOK_THRESH(NFPROTO_IPV6
, ops
->hooknum
, state
->sk
, reasm
,
78 state
->in
, state
->out
,
79 state
->okfn
, NF_IP6_PRI_CONNTRACK_DEFRAG
+ 1);
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");