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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_id = NF_CT_DEFAULT_ZONE_ID;
 37 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 38         if (skb->nfct) {
 39                 enum ip_conntrack_info ctinfo;
 40                 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 41 
 42                 zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
 43         }
 44 #endif
 45         if (nf_bridge_in_prerouting(skb))
 46                 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
 47 
 48         if (hooknum == NF_INET_PRE_ROUTING)
 49                 return IP6_DEFRAG_CONNTRACK_IN + zone_id;
 50         else
 51                 return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
 52 }
 53 
 54 static unsigned int ipv6_defrag(void *priv,
 55                                 struct sk_buff *skb,
 56                                 const struct nf_hook_state *state)
 57 {
 58         int err;
 59 
 60 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 61         /* Previously seen (loopback)?  */
 62         if (skb->nfct && !nf_ct_is_template((struct nf_conn *)skb->nfct))
 63                 return NF_ACCEPT;
 64 #endif
 65 
 66         err = nf_ct_frag6_gather(state->net, skb,
 67                                  nf_ct6_defrag_user(state->hook, skb));
 68         /* queued */
 69         if (err == -EINPROGRESS)
 70                 return NF_STOLEN;
 71 
 72         return NF_ACCEPT;
 73 }
 74 
 75 static struct nf_hook_ops ipv6_defrag_ops[] = {
 76         {
 77                 .hook           = ipv6_defrag,
 78                 .pf             = NFPROTO_IPV6,
 79                 .hooknum        = NF_INET_PRE_ROUTING,
 80                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
 81         },
 82         {
 83                 .hook           = ipv6_defrag,
 84                 .pf             = NFPROTO_IPV6,
 85                 .hooknum        = NF_INET_LOCAL_OUT,
 86                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
 87         },
 88 };
 89 
 90 static int __init nf_defrag_init(void)
 91 {
 92         int ret = 0;
 93 
 94         ret = nf_ct_frag6_init();
 95         if (ret < 0) {
 96                 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
 97                 return ret;
 98         }
 99         ret = nf_register_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
100         if (ret < 0) {
101                 pr_err("nf_defrag_ipv6: can't register hooks\n");
102                 goto cleanup_frag6;
103         }
104         return ret;
105 
106 cleanup_frag6:
107         nf_ct_frag6_cleanup();
108         return ret;
109 
110 }
111 
112 static void __exit nf_defrag_fini(void)
113 {
114         nf_unregister_hooks(ipv6_defrag_ops, ARRAY_SIZE(ipv6_defrag_ops));
115         nf_ct_frag6_cleanup();
116 }
117 
118 void nf_defrag_ipv6_enable(void)
119 {
120 }
121 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
122 
123 module_init(nf_defrag_init);
124 module_exit(nf_defrag_fini);
125 
126 MODULE_LICENSE("GPL");
127 

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