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_core.h>
26 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
28 #include <net/netfilter/nf_conntrack_zones.h>
29 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
31 static DEFINE_MUTEX(defrag6_mutex);
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(void *priv,
56 const struct nf_hook_state *state)
60 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
61 /* Previously seen (loopback)? */
62 if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
65 if (skb->_nfct == IP_CT_UNTRACKED)
69 err = nf_ct_frag6_gather(state->net, skb,
70 nf_ct6_defrag_user(state->hook, skb));
72 if (err == -EINPROGRESS)
75 return err == 0 ? NF_ACCEPT : NF_DROP;
78 static const struct nf_hook_ops ipv6_defrag_ops[] = {
82 .hooknum = NF_INET_PRE_ROUTING,
83 .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
88 .hooknum = NF_INET_LOCAL_OUT,
89 .priority = NF_IP6_PRI_CONNTRACK_DEFRAG,
93 static void __net_exit defrag6_net_exit(struct net *net)
95 if (net->nf.defrag_ipv6) {
96 nf_unregister_net_hooks(net, ipv6_defrag_ops,
97 ARRAY_SIZE(ipv6_defrag_ops));
98 net->nf.defrag_ipv6 = false;
102 static struct pernet_operations defrag6_net_ops = {
103 .exit = defrag6_net_exit,
106 static int __init nf_defrag_init(void)
110 ret = nf_ct_frag6_init();
112 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
115 ret = register_pernet_subsys(&defrag6_net_ops);
117 pr_err("nf_defrag_ipv6: can't register pernet ops\n");
123 nf_ct_frag6_cleanup();
128 static void __exit nf_defrag_fini(void)
130 unregister_pernet_subsys(&defrag6_net_ops);
131 nf_ct_frag6_cleanup();
134 int nf_defrag_ipv6_enable(struct net *net)
140 if (net->nf.defrag_ipv6)
143 mutex_lock(&defrag6_mutex);
144 if (net->nf.defrag_ipv6)
147 err = nf_register_net_hooks(net, ipv6_defrag_ops,
148 ARRAY_SIZE(ipv6_defrag_ops));
150 net->nf.defrag_ipv6 = true;
153 mutex_unlock(&defrag6_mutex);
156 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
158 module_init(nf_defrag_init);
159 module_exit(nf_defrag_fini);
161 MODULE_LICENSE("GPL");