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Linux/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c

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  1 /* (C) 1999-2001 Paul `Rusty' Russell
  2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  3  *
  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.
  7  */
  8 
  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.h>
 18 #include <net/inet_frag.h>
 19 
 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>
 29 #endif
 30 #include <net/netfilter/nf_conntrack_zones.h>
 31 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 32 
 33 static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
 34                                                 struct sk_buff *skb)
 35 {
 36         u16 zone = NF_CT_DEFAULT_ZONE;
 37 
 38 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 39         if (skb->nfct)
 40                 zone = nf_ct_zone((struct nf_conn *)skb->nfct);
 41 #endif
 42 
 43 #ifdef CONFIG_BRIDGE_NETFILTER
 44         if (skb->nf_bridge &&
 45             skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)
 46                 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone;
 47 #endif
 48         if (hooknum == NF_INET_PRE_ROUTING)
 49                 return IP6_DEFRAG_CONNTRACK_IN + zone;
 50         else
 51                 return IP6_DEFRAG_CONNTRACK_OUT + zone;
 52 
 53 }
 54 
 55 static unsigned int ipv6_defrag(const struct nf_hook_ops *ops,
 56                                 struct sk_buff *skb,
 57                                 const struct net_device *in,
 58                                 const struct net_device *out,
 59                                 int (*okfn)(struct sk_buff *))
 60 {
 61         struct sk_buff *reasm;
 62 
 63 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 64         /* Previously seen (loopback)?  */
 65         if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
 66                 return NF_ACCEPT;
 67 #endif
 68 
 69         reasm = nf_ct_frag6_gather(skb, nf_ct6_defrag_user(ops->hooknum, skb));
 70         /* queued */
 71         if (reasm == NULL)
 72                 return NF_STOLEN;
 73 
 74         /* error occurred or not fragmented */
 75         if (reasm == skb)
 76                 return NF_ACCEPT;
 77 
 78         nf_ct_frag6_consume_orig(reasm);
 79 
 80         NF_HOOK_THRESH(NFPROTO_IPV6, ops->hooknum, reasm,
 81                        (struct net_device *) in, (struct net_device *) out,
 82                        okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
 83 
 84         return NF_STOLEN;
 85 }
 86 
 87 static struct nf_hook_ops ipv6_defrag_ops[] = {
 88         {
 89                 .hook           = ipv6_defrag,
 90                 .owner          = THIS_MODULE,
 91                 .pf             = NFPROTO_IPV6,
 92                 .hooknum        = NF_INET_PRE_ROUTING,
 93                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
 94         },
 95         {
 96                 .hook           = ipv6_defrag,
 97                 .owner          = THIS_MODULE,
 98                 .pf             = NFPROTO_IPV6,
 99                 .hooknum        = NF_INET_LOCAL_OUT,
100                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
101         },
102 };
103 
104 static int __init nf_defrag_init(void)
105 {
106         int ret = 0;
107 
108         ret = nf_ct_frag6_init();
109         if (ret < 0) {
110                 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
111                 return ret;
112         }
113         ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
114         if (ret < 0) {
115                 pr_err("nf_defrag_ipv6: can't register hooks\n");
116                 goto cleanup_frag6;
117         }
118         return ret;
119 
120 cleanup_frag6:
121         nf_ct_frag6_cleanup();
122         return ret;
123 
124 }
125 
126 static void __exit nf_defrag_fini(void)
127 {
128         nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
129         nf_ct_frag6_cleanup();
130 }
131 
132 void nf_defrag_ipv6_enable(void)
133 {
134 }
135 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
136 
137 module_init(nf_defrag_init);
138 module_exit(nf_defrag_fini);
139 
140 MODULE_LICENSE("GPL");
141 

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