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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_frag.h>
 18 
 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>
 27 #endif
 28 #include <net/netfilter/nf_conntrack_zones.h>
 29 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 30 
 31 static DEFINE_MUTEX(defrag6_mutex);
 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(skb)) {
 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(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
 63                 return NF_ACCEPT;
 64 
 65         if (skb->_nfct == IP_CT_UNTRACKED)
 66                 return NF_ACCEPT;
 67 #endif
 68 
 69         err = nf_ct_frag6_gather(state->net, skb,
 70                                  nf_ct6_defrag_user(state->hook, skb));
 71         /* queued */
 72         if (err == -EINPROGRESS)
 73                 return NF_STOLEN;
 74 
 75         return err == 0 ? NF_ACCEPT : NF_DROP;
 76 }
 77 
 78 static const struct nf_hook_ops ipv6_defrag_ops[] = {
 79         {
 80                 .hook           = ipv6_defrag,
 81                 .pf             = NFPROTO_IPV6,
 82                 .hooknum        = NF_INET_PRE_ROUTING,
 83                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
 84         },
 85         {
 86                 .hook           = ipv6_defrag,
 87                 .pf             = NFPROTO_IPV6,
 88                 .hooknum        = NF_INET_LOCAL_OUT,
 89                 .priority       = NF_IP6_PRI_CONNTRACK_DEFRAG,
 90         },
 91 };
 92 
 93 static void __net_exit defrag6_net_exit(struct net *net)
 94 {
 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;
 99         }
100 }
101 
102 static struct pernet_operations defrag6_net_ops = {
103         .exit = defrag6_net_exit,
104 };
105 
106 static int __init nf_defrag_init(void)
107 {
108         int ret = 0;
109 
110         ret = nf_ct_frag6_init();
111         if (ret < 0) {
112                 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
113                 return ret;
114         }
115         ret = register_pernet_subsys(&defrag6_net_ops);
116         if (ret < 0) {
117                 pr_err("nf_defrag_ipv6: can't register pernet ops\n");
118                 goto cleanup_frag6;
119         }
120         return ret;
121 
122 cleanup_frag6:
123         nf_ct_frag6_cleanup();
124         return ret;
125 
126 }
127 
128 static void __exit nf_defrag_fini(void)
129 {
130         unregister_pernet_subsys(&defrag6_net_ops);
131         nf_ct_frag6_cleanup();
132 }
133 
134 int nf_defrag_ipv6_enable(struct net *net)
135 {
136         int err = 0;
137 
138         might_sleep();
139 
140         if (net->nf.defrag_ipv6)
141                 return 0;
142 
143         mutex_lock(&defrag6_mutex);
144         if (net->nf.defrag_ipv6)
145                 goto out_unlock;
146 
147         err = nf_register_net_hooks(net, ipv6_defrag_ops,
148                                     ARRAY_SIZE(ipv6_defrag_ops));
149         if (err == 0)
150                 net->nf.defrag_ipv6 = true;
151 
152  out_unlock:
153         mutex_unlock(&defrag6_mutex);
154         return err;
155 }
156 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
157 
158 module_init(nf_defrag_init);
159 module_exit(nf_defrag_fini);
160 
161 MODULE_LICENSE("GPL");
162 

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