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Linux/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* (C) 1999-2001 Paul `Rusty' Russell
  3  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  4  */
  5 
  6 #include <linux/types.h>
  7 #include <linux/ipv6.h>
  8 #include <linux/in6.h>
  9 #include <linux/netfilter.h>
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/icmp.h>
 13 #include <linux/sysctl.h>
 14 #include <net/ipv6_frag.h>
 15 
 16 #include <linux/netfilter_ipv6.h>
 17 #include <linux/netfilter_bridge.h>
 18 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 19 #include <net/netfilter/nf_conntrack.h>
 20 #include <net/netfilter/nf_conntrack_helper.h>
 21 #include <net/netfilter/nf_conntrack_l4proto.h>
 22 #include <net/netfilter/nf_conntrack_core.h>
 23 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
 24 #endif
 25 #include <net/netfilter/nf_conntrack_zones.h>
 26 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 27 
 28 static DEFINE_MUTEX(defrag6_mutex);
 29 
 30 static enum ip6_defrag_users nf_ct6_defrag_user(unsigned int hooknum,
 31                                                 struct sk_buff *skb)
 32 {
 33         u16 zone_id = NF_CT_DEFAULT_ZONE_ID;
 34 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 35         if (skb_nfct(skb)) {
 36                 enum ip_conntrack_info ctinfo;
 37                 const struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
 38 
 39                 zone_id = nf_ct_zone_id(nf_ct_zone(ct), CTINFO2DIR(ctinfo));
 40         }
 41 #endif
 42         if (nf_bridge_in_prerouting(skb))
 43                 return IP6_DEFRAG_CONNTRACK_BRIDGE_IN + zone_id;
 44 
 45         if (hooknum == NF_INET_PRE_ROUTING)
 46                 return IP6_DEFRAG_CONNTRACK_IN + zone_id;
 47         else
 48                 return IP6_DEFRAG_CONNTRACK_OUT + zone_id;
 49 }
 50 
 51 static unsigned int ipv6_defrag(void *priv,
 52                                 struct sk_buff *skb,
 53                                 const struct nf_hook_state *state)
 54 {
 55         int err;
 56 
 57 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 58         /* Previously seen (loopback)?  */
 59         if (skb_nfct(skb) && !nf_ct_is_template((struct nf_conn *)skb_nfct(skb)))
 60                 return NF_ACCEPT;
 61 
 62         if (skb->_nfct == IP_CT_UNTRACKED)
 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 err == 0 ? NF_ACCEPT : NF_DROP;
 73 }
 74 
 75 static const 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 void __net_exit defrag6_net_exit(struct net *net)
 91 {
 92         if (net->nf.defrag_ipv6) {
 93                 nf_unregister_net_hooks(net, ipv6_defrag_ops,
 94                                         ARRAY_SIZE(ipv6_defrag_ops));
 95                 net->nf.defrag_ipv6 = false;
 96         }
 97 }
 98 
 99 static struct pernet_operations defrag6_net_ops = {
100         .exit = defrag6_net_exit,
101 };
102 
103 static int __init nf_defrag_init(void)
104 {
105         int ret = 0;
106 
107         ret = nf_ct_frag6_init();
108         if (ret < 0) {
109                 pr_err("nf_defrag_ipv6: can't initialize frag6.\n");
110                 return ret;
111         }
112         ret = register_pernet_subsys(&defrag6_net_ops);
113         if (ret < 0) {
114                 pr_err("nf_defrag_ipv6: can't register pernet ops\n");
115                 goto cleanup_frag6;
116         }
117         return ret;
118 
119 cleanup_frag6:
120         nf_ct_frag6_cleanup();
121         return ret;
122 
123 }
124 
125 static void __exit nf_defrag_fini(void)
126 {
127         unregister_pernet_subsys(&defrag6_net_ops);
128         nf_ct_frag6_cleanup();
129 }
130 
131 int nf_defrag_ipv6_enable(struct net *net)
132 {
133         int err = 0;
134 
135         might_sleep();
136 
137         if (net->nf.defrag_ipv6)
138                 return 0;
139 
140         mutex_lock(&defrag6_mutex);
141         if (net->nf.defrag_ipv6)
142                 goto out_unlock;
143 
144         err = nf_register_net_hooks(net, ipv6_defrag_ops,
145                                     ARRAY_SIZE(ipv6_defrag_ops));
146         if (err == 0)
147                 net->nf.defrag_ipv6 = true;
148 
149  out_unlock:
150         mutex_unlock(&defrag6_mutex);
151         return err;
152 }
153 EXPORT_SYMBOL_GPL(nf_defrag_ipv6_enable);
154 
155 module_init(nf_defrag_init);
156 module_exit(nf_defrag_fini);
157 
158 MODULE_LICENSE("GPL");
159 

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