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>
17 #include <net/ipv6_frag.h>
19 #include <linux/netfilter_ipv6.h>
20 #include <linux/netfilter_bridge.h>
21 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
22 #include <net/netfilter/nf_conntrack.h>
23 #include <net/netfilter/nf_conntrack_helper.h>
24 #include <net/netfilter/nf_conntrack_l4proto.h>
25 #include <net/netfilter/nf_conntrack_l3proto.h>
26 #include <net/netfilter/nf_conntrack_core.h>
27 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
29 #include <net/netfilter/nf_conntrack_zones.h>
30 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
32 static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
35 u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
36 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
38 enum ip_conntrack_info ctinfo;
39 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
41 zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
44 if (nf_bridge_in_prerouting(skb))
45 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
47 if (hooknum == NF_INET_PRE_ROUTING)
48 return IP6_DEFRAG_CONNTRACK_IN + zone_id;
50 return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
53 static unsigned int ipv6_defrag(void *priv,
55 const struct nf_hook_state *state)
59 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
60 /* Previously seen (loopback)? */
61 if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
65 err = nf_ct_frag6_gather(state->net, skb,
66 nf_ct6_defrag_user(state->hook, skb));
68 if (err == -EINPROGRESS)
71 return err == 0 ? NF_ACCEPT : NF_DROP;
74 static struct nf_hook_ops ipv6_defrag_ops[] = {
78 .hooknum = NF_INET_PRE_ROUTING,
79 .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
84 .hooknum = NF_INET_LOCAL_OUT,
85 .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
89 static int __init nf_defrag_init(void)
93 ret = nf_ct_frag6_init();
95 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
98 ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
100 pr_err("nf_defrag_ipv6: can't register hooks\n");
106 nf_ct_frag6_cleanup();
111 static void __exit nf_defrag_fini(void)
113 nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
114 nf_ct_frag6_cleanup();
117 void nf_defrag_ipv6_enable(void)
120 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
122 module_init(nf_defrag_init);
123 module_exit(nf_defrag_fini);
125 MODULE_LICENSE("GPL");