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Linux/net/ipv6/netfilter/nf_tables_ipv6.c

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  1 /*
  2  * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
  3  * Copyright (c) 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * Development of this code funded by Astaro AG (http://www.astaro.com/)
 10  */
 11 
 12 #include <linux/init.h>
 13 #include <linux/module.h>
 14 #include <linux/ipv6.h>
 15 #include <linux/netfilter_ipv6.h>
 16 #include <net/netfilter/nf_tables.h>
 17 #include <net/netfilter/nf_tables_ipv6.h>
 18 
 19 static unsigned int nft_do_chain_ipv6(void *priv,
 20                                       struct sk_buff *skb,
 21                                       const struct nf_hook_state *state)
 22 {
 23         struct nft_pktinfo pkt;
 24 
 25         /* malformed packet, drop it */
 26         if (nft_set_pktinfo_ipv6(&pkt, skb, state) < 0)
 27                 return NF_DROP;
 28 
 29         return nft_do_chain(&pkt, priv);
 30 }
 31 
 32 static unsigned int nft_ipv6_output(void *priv,
 33                                     struct sk_buff *skb,
 34                                     const struct nf_hook_state *state)
 35 {
 36         if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
 37                 if (net_ratelimit())
 38                         pr_info("nf_tables_ipv6: ignoring short SOCK_RAW "
 39                                 "packet\n");
 40                 return NF_ACCEPT;
 41         }
 42 
 43         return nft_do_chain_ipv6(priv, skb, state);
 44 }
 45 
 46 struct nft_af_info nft_af_ipv6 __read_mostly = {
 47         .family         = NFPROTO_IPV6,
 48         .nhooks         = NF_INET_NUMHOOKS,
 49         .owner          = THIS_MODULE,
 50         .nops           = 1,
 51         .hooks          = {
 52                 [NF_INET_LOCAL_IN]      = nft_do_chain_ipv6,
 53                 [NF_INET_LOCAL_OUT]     = nft_ipv6_output,
 54                 [NF_INET_FORWARD]       = nft_do_chain_ipv6,
 55                 [NF_INET_PRE_ROUTING]   = nft_do_chain_ipv6,
 56                 [NF_INET_POST_ROUTING]  = nft_do_chain_ipv6,
 57         },
 58 };
 59 EXPORT_SYMBOL_GPL(nft_af_ipv6);
 60 
 61 static int nf_tables_ipv6_init_net(struct net *net)
 62 {
 63         net->nft.ipv6 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
 64         if (net->nft.ipv6 == NULL)
 65                 return -ENOMEM;
 66 
 67         memcpy(net->nft.ipv6, &nft_af_ipv6, sizeof(nft_af_ipv6));
 68 
 69         if (nft_register_afinfo(net, net->nft.ipv6) < 0)
 70                 goto err;
 71 
 72         return 0;
 73 err:
 74         kfree(net->nft.ipv6);
 75         return -ENOMEM;
 76 }
 77 
 78 static void nf_tables_ipv6_exit_net(struct net *net)
 79 {
 80         nft_unregister_afinfo(net, net->nft.ipv6);
 81         kfree(net->nft.ipv6);
 82 }
 83 
 84 static struct pernet_operations nf_tables_ipv6_net_ops = {
 85         .init   = nf_tables_ipv6_init_net,
 86         .exit   = nf_tables_ipv6_exit_net,
 87 };
 88 
 89 static const struct nf_chain_type filter_ipv6 = {
 90         .name           = "filter",
 91         .type           = NFT_CHAIN_T_DEFAULT,
 92         .family         = NFPROTO_IPV6,
 93         .owner          = THIS_MODULE,
 94         .hook_mask      = (1 << NF_INET_LOCAL_IN) |
 95                           (1 << NF_INET_LOCAL_OUT) |
 96                           (1 << NF_INET_FORWARD) |
 97                           (1 << NF_INET_PRE_ROUTING) |
 98                           (1 << NF_INET_POST_ROUTING),
 99 };
100 
101 static int __init nf_tables_ipv6_init(void)
102 {
103         int ret;
104 
105         nft_register_chain_type(&filter_ipv6);
106         ret = register_pernet_subsys(&nf_tables_ipv6_net_ops);
107         if (ret < 0)
108                 nft_unregister_chain_type(&filter_ipv6);
109 
110         return ret;
111 }
112 
113 static void __exit nf_tables_ipv6_exit(void)
114 {
115         unregister_pernet_subsys(&nf_tables_ipv6_net_ops);
116         nft_unregister_chain_type(&filter_ipv6);
117 }
118 
119 module_init(nf_tables_ipv6_init);
120 module_exit(nf_tables_ipv6_exit);
121 
122 MODULE_LICENSE("GPL");
123 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
124 MODULE_ALIAS_NFT_FAMILY(AF_INET6);
125 

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